FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/ac3enc.c
Date: 2024-03-29 01:21:52
Exec Total Coverage
Lines: 1011 1207 83.8%
Functions: 41 43 95.3%
Branches: 624 867 72.0%

Line Branch Exec Source
1 /*
2 * The simplest AC-3 encoder
3 * Copyright (c) 2000 Fabrice Bellard
4 * Copyright (c) 2006-2010 Justin Ruggles <justin.ruggles@gmail.com>
5 * Copyright (c) 2006-2010 Prakash Punnoor <prakash@punnoor.de>
6 *
7 * This file is part of FFmpeg.
8 *
9 * FFmpeg is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Lesser General Public
11 * License as published by the Free Software Foundation; either
12 * version 2.1 of the License, or (at your option) any later version.
13 *
14 * FFmpeg is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Lesser General Public License for more details.
18 *
19 * You should have received a copy of the GNU Lesser General Public
20 * License along with FFmpeg; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 */
23
24 /**
25 * @file
26 * The simplest AC-3 encoder.
27 */
28
29 #include <stdint.h>
30
31 #include "libavutil/attributes.h"
32 #include "libavutil/avassert.h"
33 #include "libavutil/avstring.h"
34 #include "libavutil/channel_layout.h"
35 #include "libavutil/crc.h"
36 #include "libavutil/emms.h"
37 #include "libavutil/internal.h"
38 #include "libavutil/mem_internal.h"
39 #include "libavutil/opt.h"
40 #include "libavutil/thread.h"
41 #include "avcodec.h"
42 #include "codec_internal.h"
43 #include "config_components.h"
44 #include "encode.h"
45 #include "me_cmp.h"
46 #include "put_bits.h"
47 #include "audiodsp.h"
48 #include "ac3dsp.h"
49 #include "ac3.h"
50 #include "ac3defs.h"
51 #include "ac3tab.h"
52 #include "ac3enc.h"
53 #include "eac3enc.h"
54
55 typedef struct AC3Mant {
56 int16_t *qmant1_ptr, *qmant2_ptr, *qmant4_ptr; ///< mantissa pointers for bap=1,2,4
57 int mant1_cnt, mant2_cnt, mant4_cnt; ///< mantissa counts for bap=1,2,4
58 } AC3Mant;
59
60 #define CMIXLEV_NUM_OPTIONS 3
61 static const float cmixlev_options[CMIXLEV_NUM_OPTIONS] = {
62 LEVEL_MINUS_3DB, LEVEL_MINUS_4POINT5DB, LEVEL_MINUS_6DB
63 };
64
65 #define SURMIXLEV_NUM_OPTIONS 3
66 static const float surmixlev_options[SURMIXLEV_NUM_OPTIONS] = {
67 LEVEL_MINUS_3DB, LEVEL_MINUS_6DB, LEVEL_ZERO
68 };
69
70 #define EXTMIXLEV_NUM_OPTIONS 8
71 static const float extmixlev_options[EXTMIXLEV_NUM_OPTIONS] = {
72 LEVEL_PLUS_3DB, LEVEL_PLUS_1POINT5DB, LEVEL_ONE, LEVEL_MINUS_1POINT5DB,
73 LEVEL_MINUS_3DB, LEVEL_MINUS_4POINT5DB, LEVEL_MINUS_6DB, LEVEL_ZERO
74 };
75
76 /* The first two options apply only to the AC-3 encoders;
77 * the rest is also valid for EAC-3. When modifying it,
78 * it might be necessary to adapt said offset in eac3enc.c. */
79 #define OFFSET(param) offsetof(AC3EncodeContext, options.param)
80 #define AC3ENC_PARAM (AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM)
81 const AVOption ff_ac3_enc_options[] = {
82 /* AC-3 downmix levels */
83 {"center_mixlev", "Center Mix Level", OFFSET(center_mix_level), AV_OPT_TYPE_FLOAT, {.dbl = LEVEL_MINUS_4POINT5DB }, 0.0, 1.0, AC3ENC_PARAM},
84 {"surround_mixlev", "Surround Mix Level", OFFSET(surround_mix_level), AV_OPT_TYPE_FLOAT, {.dbl = LEVEL_MINUS_6DB }, 0.0, 1.0, AC3ENC_PARAM},
85 /* audio production information */
86 {"mixing_level", "Mixing Level", OFFSET(mixing_level), AV_OPT_TYPE_INT, {.i64 = AC3ENC_OPT_NONE }, AC3ENC_OPT_NONE, 111, AC3ENC_PARAM},
87 {"room_type", "Room Type", OFFSET(room_type), AV_OPT_TYPE_INT, {.i64 = AC3ENC_OPT_NONE }, AC3ENC_OPT_NONE, AC3ENC_OPT_SMALL_ROOM, AC3ENC_PARAM, .unit = "room_type"},
88 {"notindicated", "Not Indicated (default)", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_NOT_INDICATED }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "room_type"},
89 {"large", "Large Room", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_LARGE_ROOM }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "room_type"},
90 {"small", "Small Room", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_SMALL_ROOM }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "room_type"},
91 /* Metadata Options */
92 {"per_frame_metadata", "Allow Changing Metadata Per-Frame", OFFSET(allow_per_frame_metadata), AV_OPT_TYPE_BOOL, {.i64 = 0 }, 0, 1, AC3ENC_PARAM},
93 {"copyright", "Copyright Bit", OFFSET(copyright), AV_OPT_TYPE_INT, {.i64 = AC3ENC_OPT_NONE }, AC3ENC_OPT_NONE, 1, AC3ENC_PARAM},
94 {"dialnorm", "Dialogue Level (dB)", OFFSET(dialogue_level), AV_OPT_TYPE_INT, {.i64 = -31 }, -31, -1, AC3ENC_PARAM},
95 {"dsur_mode", "Dolby Surround Mode", OFFSET(dolby_surround_mode), AV_OPT_TYPE_INT, {.i64 = AC3ENC_OPT_NONE }, AC3ENC_OPT_NONE, AC3ENC_OPT_MODE_ON, AC3ENC_PARAM, .unit = "dsur_mode"},
96 {"notindicated", "Not Indicated (default)", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_NOT_INDICATED }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "dsur_mode"},
97 {"on", "Dolby Surround Encoded", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_MODE_ON }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "dsur_mode"},
98 {"off", "Not Dolby Surround Encoded", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_MODE_OFF }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "dsur_mode"},
99 {"original", "Original Bit Stream", OFFSET(original), AV_OPT_TYPE_INT, {.i64 = AC3ENC_OPT_NONE }, AC3ENC_OPT_NONE, 1, AC3ENC_PARAM},
100 /* extended bitstream information */
101 {"dmix_mode", "Preferred Stereo Downmix Mode", OFFSET(preferred_stereo_downmix), AV_OPT_TYPE_INT, {.i64 = AC3ENC_OPT_NONE }, AC3ENC_OPT_NONE, AC3ENC_OPT_DOWNMIX_DPLII, AC3ENC_PARAM, .unit = "dmix_mode"},
102 {"notindicated", "Not Indicated (default)", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_NOT_INDICATED }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "dmix_mode"},
103 {"ltrt", "Lt/Rt Downmix Preferred", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_DOWNMIX_LTRT }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "dmix_mode"},
104 {"loro", "Lo/Ro Downmix Preferred", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_DOWNMIX_LORO }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "dmix_mode"},
105 {"dplii", "Dolby Pro Logic II Downmix Preferred", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_DOWNMIX_DPLII }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "dmix_mode"},
106 {"ltrt_cmixlev", "Lt/Rt Center Mix Level", OFFSET(ltrt_center_mix_level), AV_OPT_TYPE_FLOAT, {.dbl = -1.0 }, -1.0, 2.0, AC3ENC_PARAM},
107 {"ltrt_surmixlev", "Lt/Rt Surround Mix Level", OFFSET(ltrt_surround_mix_level), AV_OPT_TYPE_FLOAT, {.dbl = -1.0 }, -1.0, 2.0, AC3ENC_PARAM},
108 {"loro_cmixlev", "Lo/Ro Center Mix Level", OFFSET(loro_center_mix_level), AV_OPT_TYPE_FLOAT, {.dbl = -1.0 }, -1.0, 2.0, AC3ENC_PARAM},
109 {"loro_surmixlev", "Lo/Ro Surround Mix Level", OFFSET(loro_surround_mix_level), AV_OPT_TYPE_FLOAT, {.dbl = -1.0 }, -1.0, 2.0, AC3ENC_PARAM},
110 {"dsurex_mode", "Dolby Surround EX Mode", OFFSET(dolby_surround_ex_mode), AV_OPT_TYPE_INT, {.i64 = AC3ENC_OPT_NONE }, AC3ENC_OPT_NONE, AC3ENC_OPT_DSUREX_DPLIIZ, AC3ENC_PARAM, .unit = "dsurex_mode"},
111 {"notindicated", "Not Indicated (default)", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_NOT_INDICATED }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "dsurex_mode"},
112 {"on", "Dolby Surround EX Encoded", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_MODE_ON }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "dsurex_mode"},
113 {"off", "Not Dolby Surround EX Encoded", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_MODE_OFF }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "dsurex_mode"},
114 {"dpliiz", "Dolby Pro Logic IIz-encoded", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_DSUREX_DPLIIZ }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "dsurex_mode"},
115 {"dheadphone_mode", "Dolby Headphone Mode", OFFSET(dolby_headphone_mode), AV_OPT_TYPE_INT, {.i64 = AC3ENC_OPT_NONE }, AC3ENC_OPT_NONE, AC3ENC_OPT_MODE_ON, AC3ENC_PARAM, .unit = "dheadphone_mode"},
116 {"notindicated", "Not Indicated (default)", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_NOT_INDICATED }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "dheadphone_mode"},
117 {"on", "Dolby Headphone Encoded", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_MODE_ON }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "dheadphone_mode"},
118 {"off", "Not Dolby Headphone Encoded", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_MODE_OFF }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "dheadphone_mode"},
119 {"ad_conv_type", "A/D Converter Type", OFFSET(ad_converter_type), AV_OPT_TYPE_INT, {.i64 = AC3ENC_OPT_NONE }, AC3ENC_OPT_NONE, AC3ENC_OPT_ADCONV_HDCD, AC3ENC_PARAM, .unit = "ad_conv_type"},
120 {"standard", "Standard (default)", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_ADCONV_STANDARD }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "ad_conv_type"},
121 {"hdcd", "HDCD", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_ADCONV_HDCD }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "ad_conv_type"},
122 /* Other Encoding Options */
123 {"stereo_rematrixing", "Stereo Rematrixing", OFFSET(stereo_rematrixing), AV_OPT_TYPE_BOOL, {.i64 = 1 }, 0, 1, AC3ENC_PARAM},
124 {"channel_coupling", "Channel Coupling", OFFSET(channel_coupling), AV_OPT_TYPE_INT, {.i64 = AC3ENC_OPT_AUTO }, AC3ENC_OPT_AUTO, AC3ENC_OPT_ON, AC3ENC_PARAM, .unit = "channel_coupling"},
125 {"auto", "Selected by the Encoder", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_AUTO }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "channel_coupling"},
126 {"cpl_start_band", "Coupling Start Band", OFFSET(cpl_start), AV_OPT_TYPE_INT, {.i64 = AC3ENC_OPT_AUTO }, AC3ENC_OPT_AUTO, 15, AC3ENC_PARAM, .unit = "cpl_start_band"},
127 {"auto", "Selected by the Encoder", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_AUTO }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "cpl_start_band"},
128 {NULL}
129 };
130
131 const AVClass ff_ac3enc_class = {
132 .class_name = "AC-3 Encoder",
133 .item_name = av_default_item_name,
134 .option = ff_ac3_enc_options,
135 .version = LIBAVUTIL_VERSION_INT,
136 };
137
138 const FFCodecDefault ff_ac3_enc_defaults[] = {
139 { "b", "0" },
140 { NULL }
141 };
142
143 /**
144 * LUT for number of exponent groups.
145 * exponent_group_tab[coupling][exponent strategy-1][number of coefficients]
146 */
147 static uint8_t exponent_group_tab[2][3][256];
148
149
150 /**
151 * List of supported channel layouts.
152 */
153 const AVChannelLayout ff_ac3_ch_layouts[19] = {
154 AV_CHANNEL_LAYOUT_MONO,
155 AV_CHANNEL_LAYOUT_STEREO,
156 AV_CHANNEL_LAYOUT_2_1,
157 AV_CHANNEL_LAYOUT_SURROUND,
158 AV_CHANNEL_LAYOUT_2_2,
159 AV_CHANNEL_LAYOUT_QUAD,
160 AV_CHANNEL_LAYOUT_4POINT0,
161 AV_CHANNEL_LAYOUT_5POINT0,
162 AV_CHANNEL_LAYOUT_5POINT0_BACK,
163 {
164 .nb_channels = 2,
165 .order = AV_CHANNEL_ORDER_NATIVE,
166 .u.mask = AV_CH_LAYOUT_MONO | AV_CH_LOW_FREQUENCY,
167 },
168 {
169 .nb_channels = 3,
170 .order = AV_CHANNEL_ORDER_NATIVE,
171 .u.mask = AV_CH_LAYOUT_STEREO | AV_CH_LOW_FREQUENCY,
172 },
173 {
174 .nb_channels = 4,
175 .order = AV_CHANNEL_ORDER_NATIVE,
176 .u.mask = AV_CH_LAYOUT_2_1 | AV_CH_LOW_FREQUENCY,
177 },
178 {
179 .nb_channels = 4,
180 .order = AV_CHANNEL_ORDER_NATIVE,
181 .u.mask = AV_CH_LAYOUT_SURROUND | AV_CH_LOW_FREQUENCY,
182 },
183 {
184 .nb_channels = 5,
185 .order = AV_CHANNEL_ORDER_NATIVE,
186 .u.mask = AV_CH_LAYOUT_4POINT0 | AV_CH_LOW_FREQUENCY,
187 },
188 AV_CHANNEL_LAYOUT_5POINT1,
189 AV_CHANNEL_LAYOUT_5POINT1_BACK,
190 { 0 },
191 };
192
193 /**
194 * Table to remap channels from SMPTE order to AC-3 order.
195 * [channel_mode][lfe][ch]
196 */
197 static const uint8_t ac3_enc_channel_map[8][2][6] = {
198 COMMON_CHANNEL_MAP
199 { { 0, 1, 2, 3, }, { 0, 1, 3, 4, 2, } },
200 { { 0, 2, 1, 3, 4, }, { 0, 2, 1, 4, 5, 3 } },
201 };
202
203 /**
204 * LUT to select the bandwidth code based on the bit rate, sample rate, and
205 * number of full-bandwidth channels.
206 * bandwidth_tab[fbw_channels-1][sample rate code][bit rate code]
207 */
208 static const uint8_t ac3_bandwidth_tab[5][3][19] = {
209 // 32 40 48 56 64 80 96 112 128 160 192 224 256 320 384 448 512 576 640
210
211 { { 0, 0, 0, 12, 16, 32, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48 },
212 { 0, 0, 0, 16, 20, 36, 56, 56, 56, 56, 56, 56, 56, 56, 56, 56, 56, 56, 56 },
213 { 0, 0, 0, 32, 40, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60 } },
214
215 { { 0, 0, 0, 0, 0, 0, 0, 20, 24, 32, 48, 48, 48, 48, 48, 48, 48, 48, 48 },
216 { 0, 0, 0, 0, 0, 0, 4, 24, 28, 36, 56, 56, 56, 56, 56, 56, 56, 56, 56 },
217 { 0, 0, 0, 0, 0, 0, 20, 44, 52, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60 } },
218
219 { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 16, 24, 32, 40, 48, 48, 48, 48, 48, 48 },
220 { 0, 0, 0, 0, 0, 0, 0, 0, 4, 20, 28, 36, 44, 56, 56, 56, 56, 56, 56 },
221 { 0, 0, 0, 0, 0, 0, 0, 0, 20, 40, 48, 60, 60, 60, 60, 60, 60, 60, 60 } },
222
223 { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 12, 24, 32, 48, 48, 48, 48, 48, 48 },
224 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 16, 28, 36, 56, 56, 56, 56, 56, 56 },
225 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 32, 48, 60, 60, 60, 60, 60, 60, 60 } },
226
227 { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 8, 20, 32, 40, 48, 48, 48, 48 },
228 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 12, 24, 36, 44, 56, 56, 56, 56 },
229 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 28, 44, 60, 60, 60, 60, 60, 60 } }
230 };
231
232
233 /**
234 * LUT to select the coupling start band based on the bit rate, sample rate, and
235 * number of full-bandwidth channels. -1 = coupling off
236 * ac3_coupling_start_tab[channel_mode-2][sample rate code][bit rate code]
237 *
238 * TODO: more testing for optimal parameters.
239 * multi-channel tests at 44.1kHz and 32kHz.
240 */
241 static const int8_t ac3_coupling_start_tab[6][3][19] = {
242 // 32 40 48 56 64 80 96 112 128 160 192 224 256 320 384 448 512 576 640
243
244 // 2/0
245 { { 0, 0, 0, 0, 0, 0, 0, 1, 1, 7, 8, 11, 12, -1, -1, -1, -1, -1, -1 },
246 { 0, 0, 0, 0, 0, 0, 1, 3, 5, 7, 10, 12, 13, -1, -1, -1, -1, -1, -1 },
247 { 0, 0, 0, 0, 1, 2, 2, 9, 13, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1 } },
248
249 // 3/0
250 { { 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 6, 9, 11, 12, 13, -1, -1, -1, -1 },
251 { 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 6, 9, 11, 12, 13, -1, -1, -1, -1 },
252 { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 } },
253
254 // 2/1 - untested
255 { { 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 6, 9, 11, 12, 13, -1, -1, -1, -1 },
256 { 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 6, 9, 11, 12, 13, -1, -1, -1, -1 },
257 { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 } },
258
259 // 3/1
260 { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 2, 10, 11, 11, 12, 12, 14, -1 },
261 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 2, 10, 11, 11, 12, 12, 14, -1 },
262 { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 } },
263
264 // 2/2 - untested
265 { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 2, 10, 11, 11, 12, 12, 14, -1 },
266 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 2, 10, 11, 11, 12, 12, 14, -1 },
267 { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 } },
268
269 // 3/2
270 { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 6, 8, 11, 12, 12, -1, -1 },
271 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 6, 8, 11, 12, 12, -1, -1 },
272 { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 } },
273 };
274
275
276 /**
277 * Adjust the frame size to make the average bit rate match the target bit rate.
278 * This is only needed for 11025, 22050, and 44100 sample rates or any E-AC-3.
279 *
280 * @param s AC-3 encoder private context
281 */
282 1243 void ff_ac3_adjust_frame_size(AC3EncodeContext *s)
283 {
284
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1279 while (s->bits_written >= s->bit_rate && s->samples_written >= s->sample_rate) {
285 36 s->bits_written -= s->bit_rate;
286 36 s->samples_written -= s->sample_rate;
287 }
288 2486 s->frame_size = s->frame_size_min +
289
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1243 2 * (s->bits_written * s->sample_rate < s->samples_written * s->bit_rate);
290 1243 s->bits_written += s->frame_size * 8;
291 1243 s->samples_written += AC3_BLOCK_SIZE * s->num_blocks;
292 1243 }
293
294
295 /**
296 * Set the initial coupling strategy parameters prior to coupling analysis.
297 *
298 * @param s AC-3 encoder private context
299 */
300 1243 void ff_ac3_compute_coupling_strategy(AC3EncodeContext *s)
301 {
302 int blk, ch;
303 int got_cpl_snr;
304 int num_cpl_blocks;
305
306 /* set coupling use flags for each block/channel */
307 /* TODO: turn coupling on/off and adjust start band based on bit usage */
308
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8701 for (blk = 0; blk < s->num_blocks; blk++) {
309 7458 AC3Block *block = &s->blocks[blk];
310
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19230 for (ch = 1; ch <= s->fbw_channels; ch++)
311 11772 block->channel_in_cpl[ch] = s->cpl_on;
312 }
313
314 /* enable coupling for each block if at least 2 channels have coupling
315 enabled for that block */
316 1243 got_cpl_snr = 0;
317 1243 num_cpl_blocks = 0;
318
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8701 for (blk = 0; blk < s->num_blocks; blk++) {
319 7458 AC3Block *block = &s->blocks[blk];
320 7458 block->num_cpl_channels = 0;
321
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19230 for (ch = 1; ch <= s->fbw_channels; ch++)
322 11772 block->num_cpl_channels += block->channel_in_cpl[ch];
323 7458 block->cpl_in_use = block->num_cpl_channels > 1;
324 7458 num_cpl_blocks += block->cpl_in_use;
325
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7458 if (!block->cpl_in_use) {
326 3144 block->num_cpl_channels = 0;
327
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6288 for (ch = 1; ch <= s->fbw_channels; ch++)
328 3144 block->channel_in_cpl[ch] = 0;
329 }
330
331 7458 block->new_cpl_strategy = !blk;
332
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7458 if (blk) {
333
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16025 for (ch = 1; ch <= s->fbw_channels; ch++) {
334
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9810 if (block->channel_in_cpl[ch] != s->blocks[blk-1].channel_in_cpl[ch]) {
335 block->new_cpl_strategy = 1;
336 break;
337 }
338 }
339 }
340 7458 block->new_cpl_leak = block->new_cpl_strategy;
341
342
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7458 if (!blk || (block->cpl_in_use && !got_cpl_snr)) {
343 1243 block->new_snr_offsets = 1;
344
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1243 if (block->cpl_in_use)
345 719 got_cpl_snr = 1;
346 } else {
347 6215 block->new_snr_offsets = 0;
348 }
349 }
350
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1243 if (!num_cpl_blocks)
351 524 s->cpl_on = 0;
352
353 /* set bandwidth for each channel */
354
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8701 for (blk = 0; blk < s->num_blocks; blk++) {
355 7458 AC3Block *block = &s->blocks[blk];
356
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19230 for (ch = 1; ch <= s->fbw_channels; ch++) {
357
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11772 if (block->channel_in_cpl[ch])
358 8628 block->end_freq[ch] = s->start_freq[CPL_CH];
359 else
360 3144 block->end_freq[ch] = s->bandwidth_code * 3 + 73;
361 }
362 }
363 1243 }
364
365
366 /**
367 * Apply stereo rematrixing to coefficients based on rematrixing flags.
368 *
369 * @param s AC-3 encoder private context
370 */
371 1243 static void ac3_apply_rematrixing(AC3EncodeContext *s)
372 {
373 int nb_coefs;
374 int blk, bnd, i;
375 int start, end;
376 1243 uint8_t *flags = NULL;
377
378
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1243 if (!s->rematrixing_enabled)
379 524 return;
380
381
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5033 for (blk = 0; blk < s->num_blocks; blk++) {
382 4314 AC3Block *block = &s->blocks[blk];
383
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4314 if (block->new_rematrixing_strategy)
384 2197 flags = block->rematrixing_flags;
385 4314 nb_coefs = FFMIN(block->end_freq[1], block->end_freq[2]);
386
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21570 for (bnd = 0; bnd < block->num_rematrixing_bands; bnd++) {
387
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17256 if (flags[bnd]) {
388 9547 start = ff_ac3_rematrix_band_tab[bnd];
389 9547 end = FFMIN(nb_coefs, ff_ac3_rematrix_band_tab[bnd+1]);
390
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225283 for (i = start; i < end; i++) {
391 215736 int32_t lt = block->fixed_coef[1][i];
392 215736 int32_t rt = block->fixed_coef[2][i];
393 215736 block->fixed_coef[1][i] = (lt + rt) >> 1;
394 215736 block->fixed_coef[2][i] = (lt - rt) >> 1;
395 }
396 }
397 }
398 }
399 }
400
401
402 /*
403 * Initialize exponent tables.
404 */
405 10 static av_cold void exponent_init(void)
406 {
407 int expstr, i, grpsize;
408
409
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40 for (expstr = EXP_D15-1; expstr <= EXP_D45-1; expstr++) {
410 30 grpsize = 3 << expstr;
411
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7350 for (i = 12; i < 256; i++) {
412 7320 exponent_group_tab[0][expstr][i] = (i + grpsize - 4) / grpsize;
413 7320 exponent_group_tab[1][expstr][i] = (i ) / grpsize;
414 }
415 }
416 /* LFE */
417 10 exponent_group_tab[0][0][7] = 2;
418 10 }
419
420
421 /*
422 * Extract exponents from the MDCT coefficients.
423 */
424 1243 static void extract_exponents(AC3EncodeContext *s)
425 {
426 1243 int ch = !s->cpl_on;
427 1243 int chan_size = AC3_MAX_COEFS * s->num_blocks * (s->channels - ch + 1);
428 1243 AC3Block *block = &s->blocks[0];
429
430 1243 s->ac3dsp.extract_exponents(block->exp[ch], block->fixed_coef[ch], chan_size);
431 1243 }
432
433
434 /**
435 * Exponent Difference Threshold.
436 * New exponents are sent if their SAD exceed this number.
437 */
438 #define EXP_DIFF_THRESHOLD 500
439
440 /**
441 * Table used to select exponent strategy based on exponent reuse block interval.
442 */
443 static const uint8_t exp_strategy_reuse_tab[4][6] = {
444 { EXP_D15, EXP_D15, EXP_D15, EXP_D15, EXP_D15, EXP_D15 },
445 { EXP_D15, EXP_D15, EXP_D15, EXP_D15, EXP_D15, EXP_D15 },
446 { EXP_D25, EXP_D25, EXP_D15, EXP_D15, EXP_D15, EXP_D15 },
447 { EXP_D45, EXP_D25, EXP_D25, EXP_D15, EXP_D15, EXP_D15 }
448 };
449
450 /*
451 * Calculate exponent strategies for all channels.
452 * Array arrangement is reversed to simplify the per-channel calculation.
453 */
454 1243 static void compute_exp_strategy(AC3EncodeContext *s)
455 {
456 int ch, blk, blk1;
457
458
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3924 for (ch = !s->cpl_on; ch <= s->fbw_channels; ch++) {
459 2681 uint8_t *exp_strategy = s->exp_strategy[ch];
460 2681 uint8_t *exp = s->blocks[0].exp[ch];
461 int exp_diff;
462
463 /* estimate if the exponent variation & decide if they should be
464 reused in the next frame */
465 2681 exp_strategy[0] = EXP_NEW;
466 2681 exp += AC3_MAX_COEFS;
467
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16086 for (blk = 1; blk < s->num_blocks; blk++, exp += AC3_MAX_COEFS) {
468
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13405 if (ch == CPL_CH) {
469
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3595 if (!s->blocks[blk-1].cpl_in_use) {
470 exp_strategy[blk] = EXP_NEW;
471 continue;
472
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3595 } else if (!s->blocks[blk].cpl_in_use) {
473 exp_strategy[blk] = EXP_REUSE;
474 continue;
475 }
476
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9810 } else if (s->blocks[blk].channel_in_cpl[ch] != s->blocks[blk-1].channel_in_cpl[ch]) {
477 exp_strategy[blk] = EXP_NEW;
478 continue;
479 }
480 13405 exp_diff = s->mecc.sad[0](NULL, exp, exp - AC3_MAX_COEFS, 16, 16);
481 13405 exp_strategy[blk] = EXP_REUSE;
482
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13405 if (ch == CPL_CH && exp_diff > (EXP_DIFF_THRESHOLD * (s->blocks[blk].end_freq[ch] - s->start_freq[ch]) / AC3_MAX_COEFS))
483 683 exp_strategy[blk] = EXP_NEW;
484
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12722 else if (ch > CPL_CH && exp_diff > EXP_DIFF_THRESHOLD)
485 313 exp_strategy[blk] = EXP_NEW;
486 }
487
488 /* now select the encoding strategy type : if exponents are often
489 recoded, we use a coarse encoding */
490 2681 blk = 0;
491
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6358 while (blk < s->num_blocks) {
492 3677 blk1 = blk + 1;
493
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16086 while (blk1 < s->num_blocks && exp_strategy[blk1] == EXP_REUSE)
494 12409 blk1++;
495 3677 exp_strategy[blk] = exp_strategy_reuse_tab[s->num_blks_code][blk1-blk-1];
496 3677 blk = blk1;
497 }
498 }
499
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1243 if (s->lfe_on) {
500 ch = s->lfe_channel;
501 s->exp_strategy[ch][0] = EXP_D15;
502 for (blk = 1; blk < s->num_blocks; blk++)
503 s->exp_strategy[ch][blk] = EXP_REUSE;
504 }
505
506 /* for E-AC-3, determine frame exponent strategy */
507
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1243 if (CONFIG_EAC3_ENCODER && s->eac3)
508 273 ff_eac3_get_frame_exp_strategy(s);
509 1243 }
510
511
512 /**
513 * Update the exponents so that they are the ones the decoder will decode.
514 *
515 * @param[in,out] exp array of exponents for 1 block in 1 channel
516 * @param nb_exps number of exponents in active bandwidth
517 * @param exp_strategy exponent strategy for the block
518 * @param cpl indicates if the block is in the coupling channel
519 */
520 3677 static void encode_exponents_blk_ch(uint8_t *exp, int nb_exps, int exp_strategy,
521 int cpl)
522 {
523 int nb_groups, i, k;
524
525 3677 nb_groups = exponent_group_tab[cpl][exp_strategy-1][nb_exps] * 3;
526
527 /* for each group, compute the minimum exponent */
528
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3677 switch(exp_strategy) {
529 575 case EXP_D25:
530
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29741 for (i = 1, k = 1-cpl; i <= nb_groups; i++) {
531 29166 uint8_t exp_min = exp[k];
532
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29166 if (exp[k+1] < exp_min)
533 9362 exp_min = exp[k+1];
534 29166 exp[i-cpl] = exp_min;
535 29166 k += 2;
536 }
537 575 break;
538 682 case EXP_D45:
539
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18688 for (i = 1, k = 1-cpl; i <= nb_groups; i++) {
540 18006 uint8_t exp_min = exp[k];
541
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18006 if (exp[k+1] < exp_min)
542 6887 exp_min = exp[k+1];
543
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18006 if (exp[k+2] < exp_min)
544 3158 exp_min = exp[k+2];
545
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18006 if (exp[k+3] < exp_min)
546 2111 exp_min = exp[k+3];
547 18006 exp[i-cpl] = exp_min;
548 18006 k += 4;
549 }
550 682 break;
551 }
552
553 /* constraint for DC exponent */
554
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3677 if (!cpl && exp[0] > 15)
555 836 exp[0] = 15;
556
557 /* decrease the delta between each groups to within 2 so that they can be
558 differentially encoded */
559
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326981 for (i = 1; i <= nb_groups; i++)
560 323304 exp[i] = FFMIN(exp[i], exp[i-1] + 2);
561 3677 i--;
562
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326981 while (--i >= 0)
563 323304 exp[i] = FFMIN(exp[i], exp[i+1] + 2);
564
565
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3677 if (cpl)
566 1402 exp[-1] = exp[0] & ~1;
567
568 /* now we have the exponent values the decoder will see */
569
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3677 switch (exp_strategy) {
570 575 case EXP_D25:
571
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29741 for (i = nb_groups, k = (nb_groups * 2)-cpl; i > 0; i--) {
572 29166 uint8_t exp1 = exp[i-cpl];
573 29166 exp[k--] = exp1;
574 29166 exp[k--] = exp1;
575 }
576 575 break;
577 682 case EXP_D45:
578
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18688 for (i = nb_groups, k = (nb_groups * 4)-cpl; i > 0; i--) {
579 18006 exp[k] = exp[k-1] = exp[k-2] = exp[k-3] = exp[i-cpl];
580 18006 k -= 4;
581 }
582 682 break;
583 }
584 3677 }
585
586
587 /*
588 * Encode exponents from original extracted form to what the decoder will see.
589 * This copies and groups exponents based on exponent strategy and reduces
590 * deltas between adjacent exponent groups so that they can be differentially
591 * encoded.
592 */
593 1243 static void encode_exponents(AC3EncodeContext *s)
594 {
595 int blk, blk1, ch, cpl;
596 uint8_t *exp, *exp_strategy;
597 int nb_coefs, num_reuse_blocks;
598
599
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3924 for (ch = !s->cpl_on; ch <= s->channels; ch++) {
600 2681 exp = s->blocks[0].exp[ch] + s->start_freq[ch];
601 2681 exp_strategy = s->exp_strategy[ch];
602
603 2681 cpl = (ch == CPL_CH);
604 2681 blk = 0;
605
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6358 while (blk < s->num_blocks) {
606 3677 AC3Block *block = &s->blocks[blk];
607
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3677 if (cpl && !block->cpl_in_use) {
608 exp += AC3_MAX_COEFS;
609 blk++;
610 continue;
611 }
612 3677 nb_coefs = block->end_freq[ch] - s->start_freq[ch];
613 3677 blk1 = blk + 1;
614
615 /* count the number of EXP_REUSE blocks after the current block
616 and set exponent reference block numbers */
617 3677 s->exp_ref_block[ch][blk] = blk;
618
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16086 while (blk1 < s->num_blocks && exp_strategy[blk1] == EXP_REUSE) {
619 12409 s->exp_ref_block[ch][blk1] = blk;
620 12409 blk1++;
621 }
622 3677 num_reuse_blocks = blk1 - blk - 1;
623
624 /* for the EXP_REUSE case we select the min of the exponents */
625 3677 s->ac3dsp.ac3_exponent_min(exp-s->start_freq[ch], num_reuse_blocks,
626 AC3_MAX_COEFS);
627
628 3677 encode_exponents_blk_ch(exp, nb_coefs, exp_strategy[blk], cpl);
629
630 3677 exp += AC3_MAX_COEFS * (num_reuse_blocks + 1);
631 3677 blk = blk1;
632 }
633 }
634
635 /* reference block numbers have been changed, so reset ref_bap_set */
636 1243 s->ref_bap_set = 0;
637 1243 }
638
639
640 /*
641 * Count exponent bits based on bandwidth, coupling, and exponent strategies.
642 */
643 1243 static int count_exponent_bits(AC3EncodeContext *s)
644 {
645 int blk, ch;
646 int nb_groups, bit_count;
647
648 1243 bit_count = 0;
649
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8701 for (blk = 0; blk < s->num_blocks; blk++) {
650 7458 AC3Block *block = &s->blocks[blk];
651
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23544 for (ch = !block->cpl_in_use; ch <= s->channels; ch++) {
652 16086 int exp_strategy = s->exp_strategy[ch][blk];
653 16086 int cpl = (ch == CPL_CH);
654 16086 int nb_coefs = block->end_freq[ch] - s->start_freq[ch];
655
656
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16086 if (exp_strategy == EXP_REUSE)
657 12409 continue;
658
659 3677 nb_groups = exponent_group_tab[cpl][exp_strategy-1][nb_coefs];
660 3677 bit_count += 4 + (nb_groups * 7);
661 }
662 }
663
664 1243 return bit_count;
665 }
666
667
668 /**
669 * Group exponents.
670 * 3 delta-encoded exponents are in each 7-bit group. The number of groups
671 * varies depending on exponent strategy and bandwidth.
672 *
673 * @param s AC-3 encoder private context
674 */
675 1243 static void ac3_group_exponents(AC3EncodeContext *s)
676 {
677 int blk, ch, i, cpl;
678 int group_size, nb_groups;
679 uint8_t *p;
680 int delta0, delta1, delta2;
681 int exp0, exp1;
682
683
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8701 for (blk = 0; blk < s->num_blocks; blk++) {
684 7458 AC3Block *block = &s->blocks[blk];
685
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23544 for (ch = !block->cpl_in_use; ch <= s->channels; ch++) {
686 16086 int exp_strategy = s->exp_strategy[ch][blk];
687
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16086 if (exp_strategy == EXP_REUSE)
688 12409 continue;
689 3677 cpl = (ch == CPL_CH);
690 3677 group_size = exp_strategy + (exp_strategy == EXP_D45);
691 3677 nb_groups = exponent_group_tab[cpl][exp_strategy-1][block->end_freq[ch]-s->start_freq[ch]];
692 3677 p = block->exp[ch] + s->start_freq[ch] - cpl;
693
694 /* DC exponent */
695 3677 exp1 = *p++;
696 3677 block->grouped_exp[ch][0] = exp1;
697
698 /* remaining exponents are delta encoded */
699
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111445 for (i = 1; i <= nb_groups; i++) {
700 /* merge three delta in one code */
701 107768 exp0 = exp1;
702 107768 exp1 = p[0];
703 107768 p += group_size;
704 107768 delta0 = exp1 - exp0 + 2;
705 av_assert2(delta0 >= 0 && delta0 <= 4);
706
707 107768 exp0 = exp1;
708 107768 exp1 = p[0];
709 107768 p += group_size;
710 107768 delta1 = exp1 - exp0 + 2;
711 av_assert2(delta1 >= 0 && delta1 <= 4);
712
713 107768 exp0 = exp1;
714 107768 exp1 = p[0];
715 107768 p += group_size;
716 107768 delta2 = exp1 - exp0 + 2;
717 av_assert2(delta2 >= 0 && delta2 <= 4);
718
719 107768 block->grouped_exp[ch][i] = ((delta0 * 5 + delta1) * 5) + delta2;
720 }
721 }
722 }
723 1243 }
724
725
726 /**
727 * Calculate final exponents from the supplied MDCT coefficients and exponent shift.
728 * Extract exponents from MDCT coefficients, calculate exponent strategies,
729 * and encode final exponents.
730 *
731 * @param s AC-3 encoder private context
732 */
733 1243 static void ac3_process_exponents(AC3EncodeContext *s)
734 {
735 1243 extract_exponents(s);
736
737 1243 compute_exp_strategy(s);
738
739 1243 encode_exponents(s);
740
741 1243 emms_c();
742 1243 }
743
744
745 /*
746 * Count frame bits that are based solely on fixed parameters.
747 * This only has to be run once when the encoder is initialized.
748 */
749 10 static void count_frame_bits_fixed(AC3EncodeContext *s)
750 {
751 static const uint8_t frame_bits_inc[8] = { 0, 0, 2, 2, 2, 4, 2, 4 };
752 int blk;
753 int frame_bits;
754
755 /* assumptions:
756 * no dynamic range codes
757 * bit allocation parameters do not change between blocks
758 * no delta bit allocation
759 * no skipped data
760 * no auxiliary data
761 * no E-AC-3 metadata
762 */
763
764 /* header */
765 10 frame_bits = 16; /* sync info */
766
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10 if (s->eac3) {
767 /* bitstream info header */
768 1 frame_bits += 35;
769 1 frame_bits += 1 + 1;
770
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1 if (s->num_blocks != 0x6)
771 frame_bits++;
772 1 frame_bits++;
773 /* audio frame header */
774
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1 if (s->num_blocks == 6)
775 1 frame_bits += 2;
776 1 frame_bits += 10;
777 /* exponent strategy */
778
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1 if (s->use_frame_exp_strategy)
779 frame_bits += 5 * s->fbw_channels;
780 else
781 1 frame_bits += s->num_blocks * 2 * s->fbw_channels;
782
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1 if (s->lfe_on)
783 frame_bits += s->num_blocks;
784 /* converter exponent strategy */
785
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1 if (s->num_blks_code != 0x3)
786 frame_bits++;
787 else
788 1 frame_bits += s->fbw_channels * 5;
789 /* snr offsets */
790 1 frame_bits += 10;
791 /* block start info */
792
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1 if (s->num_blocks != 1)
793 1 frame_bits++;
794 } else {
795 9 frame_bits += 49;
796 9 frame_bits += frame_bits_inc[s->channel_mode];
797 }
798
799 /* audio blocks */
800
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70 for (blk = 0; blk < s->num_blocks; blk++) {
801
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60 if (!s->eac3) {
802 /* block switch flags */
803 54 frame_bits += s->fbw_channels;
804
805 /* dither flags */
806 54 frame_bits += s->fbw_channels;
807 }
808
809 /* dynamic range */
810 60 frame_bits++;
811
812 /* spectral extension */
813
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60 if (s->eac3)
814 6 frame_bits++;
815
816 /* coupling strategy exists: cplstre */
817
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60 if (!s->eac3)
818 54 frame_bits++;
819
820
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60 if (!s->eac3) {
821 /* exponent strategy */
822 54 frame_bits += 2 * s->fbw_channels;
823
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54 if (s->lfe_on)
824 frame_bits++;
825
826 /* bit allocation params */
827 54 frame_bits++;
828
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54 if (!blk)
829 9 frame_bits += 2 + 2 + 2 + 2 + 3;
830 }
831
832 /* snroffste for AC-3, convsnroffste for E-AC-3 */
833 60 frame_bits++;
834
835
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60 if (!s->eac3) {
836 /* delta bit allocation */
837 54 frame_bits++;
838
839 /* skipped data */
840 54 frame_bits++;
841 }
842 }
843
844 /* auxiliary data */
845 10 frame_bits++;
846
847 /* CRC */
848 10 frame_bits += 1 + 16;
849
850 10 s->frame_bits_fixed = frame_bits;
851 10 }
852
853
854 /*
855 * Initialize bit allocation.
856 * Set default parameter codes and calculate parameter values.
857 */
858 10 static av_cold void bit_alloc_init(AC3EncodeContext *s)
859 {
860 int ch;
861
862 /* init default parameters */
863 10 s->slow_decay_code = 2;
864 10 s->fast_decay_code = 1;
865 10 s->slow_gain_code = 1;
866
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10 s->db_per_bit_code = s->eac3 ? 2 : 3;
867 10 s->floor_code = 7;
868
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33 for (ch = 0; ch <= s->channels; ch++)
869 23 s->fast_gain_code[ch] = 4;
870
871 /* initial snr offset */
872 10 s->coarse_snr_offset = 40;
873
874 /* compute real values */
875 /* currently none of these values change during encoding, so we can just
876 set them once at initialization */
877 10 s->bit_alloc.slow_decay = ff_ac3_slow_decay_tab[s->slow_decay_code] >> s->bit_alloc.sr_shift;
878 10 s->bit_alloc.fast_decay = ff_ac3_fast_decay_tab[s->fast_decay_code] >> s->bit_alloc.sr_shift;
879 10 s->bit_alloc.slow_gain = ff_ac3_slow_gain_tab[s->slow_gain_code];
880 10 s->bit_alloc.db_per_bit = ff_ac3_db_per_bit_tab[s->db_per_bit_code];
881 10 s->bit_alloc.floor = ff_ac3_floor_tab[s->floor_code];
882 10 s->bit_alloc.cpl_fast_leak = 0;
883 10 s->bit_alloc.cpl_slow_leak = 0;
884
885 10 count_frame_bits_fixed(s);
886 10 }
887
888
889 /*
890 * Count the bits used to encode the frame, minus exponents and mantissas.
891 * Bits based on fixed parameters have already been counted, so now we just
892 * have to add the bits based on parameters that change during encoding.
893 */
894 1243 static void count_frame_bits(AC3EncodeContext *s)
895 {
896 1243 AC3EncOptions *opt = &s->options;
897 int blk, ch;
898 1243 int frame_bits = 0;
899
900 /* header */
901
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1243 if (s->eac3) {
902
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273 if (opt->eac3_mixing_metadata) {
903 if (s->channel_mode > AC3_CHMODE_STEREO)
904 frame_bits += 2;
905 if (s->has_center)
906 frame_bits += 6;
907 if (s->has_surround)
908 frame_bits += 6;
909 frame_bits += s->lfe_on;
910 frame_bits += 1 + 1 + 2;
911 if (s->channel_mode < AC3_CHMODE_STEREO)
912 frame_bits++;
913 frame_bits++;
914 }
915
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273 if (opt->eac3_info_metadata) {
916 frame_bits += 3 + 1 + 1;
917 if (s->channel_mode == AC3_CHMODE_STEREO)
918 frame_bits += 2 + 2;
919 if (s->channel_mode >= AC3_CHMODE_2F2R)
920 frame_bits += 2;
921 frame_bits++;
922 if (opt->audio_production_info)
923 frame_bits += 5 + 2 + 1;
924 frame_bits++;
925 }
926 /* coupling */
927
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273 if (s->channel_mode > AC3_CHMODE_MONO) {
928 273 frame_bits++;
929
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1638 for (blk = 1; blk < s->num_blocks; blk++) {
930 1365 AC3Block *block = &s->blocks[blk];
931 1365 frame_bits++;
932
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1365 if (block->new_cpl_strategy)
933 frame_bits++;
934 }
935 }
936 /* coupling exponent strategy */
937
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273 if (s->cpl_on) {
938
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273 if (s->use_frame_exp_strategy) {
939 273 frame_bits += 5;
940 } else {
941 for (blk = 0; blk < s->num_blocks; blk++)
942 frame_bits += 2 * s->blocks[blk].cpl_in_use;
943 }
944 }
945 } else {
946
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970 if (opt->audio_production_info)
947 frame_bits += 7;
948
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970 if (s->bitstream_id == 6) {
949 if (opt->extended_bsi_1)
950 frame_bits += 14;
951 if (opt->extended_bsi_2)
952 frame_bits += 14;
953 }
954 }
955
956 /* audio blocks */
957
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8701 for (blk = 0; blk < s->num_blocks; blk++) {
958 7458 AC3Block *block = &s->blocks[blk];
959
960 /* coupling strategy */
961
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7458 if (block->new_cpl_strategy) {
962
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1243 if (!s->eac3)
963 970 frame_bits++;
964
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1243 if (block->cpl_in_use) {
965
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719 if (s->eac3)
966 273 frame_bits++;
967
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719 if (!s->eac3 || s->channel_mode != AC3_CHMODE_STEREO)
968 446 frame_bits += s->fbw_channels;
969
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719 if (s->channel_mode == AC3_CHMODE_STEREO)
970 719 frame_bits++;
971 719 frame_bits += 4 + 4;
972
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719 if (s->eac3)
973 273 frame_bits++;
974 else
975 446 frame_bits += s->num_cpl_subbands - 1;
976 }
977 }
978
979 /* coupling coordinates */
980
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7458 if (block->cpl_in_use) {
981
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12942 for (ch = 1; ch <= s->fbw_channels; ch++) {
982
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8628 if (block->channel_in_cpl[ch]) {
983
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8628 if (!s->eac3 || block->new_cpl_coords[ch] != 2)
984 8082 frame_bits++;
985
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8628 if (block->new_cpl_coords[ch]) {
986 1470 frame_bits += 2;
987 1470 frame_bits += (4 + 4) * s->num_cpl_bands;
988 }
989 }
990 }
991 }
992
993 /* stereo rematrixing */
994
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7458 if (s->channel_mode == AC3_CHMODE_STEREO) {
995
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4314 if (!s->eac3 || blk > 0)
996 4041 frame_bits++;
997
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4314 if (s->blocks[blk].new_rematrixing_strategy)
998 2197 frame_bits += block->num_rematrixing_bands;
999 }
1000
1001 /* bandwidth codes & gain range */
1002
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19230 for (ch = 1; ch <= s->fbw_channels; ch++) {
1003
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11772 if (s->exp_strategy[ch][blk] != EXP_REUSE) {
1004
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2275 if (!block->channel_in_cpl[ch])
1005 746 frame_bits += 6;
1006 2275 frame_bits += 2;
1007 }
1008 }
1009
1010 /* coupling exponent strategy */
1011
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7458 if (!s->eac3 && block->cpl_in_use)
1012 2676 frame_bits += 2;
1013
1014 /* snr offsets and fast gain codes */
1015
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7458 if (!s->eac3) {
1016
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5820 if (block->new_snr_offsets)
1017 970 frame_bits += 6 + (s->channels + block->cpl_in_use) * (4 + 3);
1018 }
1019
1020 /* coupling leak info */
1021
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7458 if (block->cpl_in_use) {
1022
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4314 if (!s->eac3 || block->new_cpl_leak != 2)
1023 4041 frame_bits++;
1024
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4314 if (block->new_cpl_leak)
1025 719 frame_bits += 3 + 3;
1026 }
1027 }
1028
1029 1243 s->frame_bits = s->frame_bits_fixed + frame_bits;
1030 1243 }
1031
1032
1033 /*
1034 * Calculate masking curve based on the final exponents.
1035 * Also calculate the power spectral densities to use in future calculations.
1036 */
1037 1243 static void bit_alloc_masking(AC3EncodeContext *s)
1038 {
1039 int blk, ch;
1040
1041
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8701 for (blk = 0; blk < s->num_blocks; blk++) {
1042 7458 AC3Block *block = &s->blocks[blk];
1043
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23544 for (ch = !block->cpl_in_use; ch <= s->channels; ch++) {
1044 /* We only need psd and mask for calculating bap.
1045 Since we currently do not calculate bap when exponent
1046 strategy is EXP_REUSE we do not need to calculate psd or mask. */
1047
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16086 if (s->exp_strategy[ch][blk] != EXP_REUSE) {
1048 3677 ff_ac3_bit_alloc_calc_psd(block->exp[ch], s->start_freq[ch],
1049 3677 block->end_freq[ch], block->psd[ch],
1050 3677 block->band_psd[ch]);
1051 3677 ff_ac3_bit_alloc_calc_mask(&s->bit_alloc, block->band_psd[ch],
1052 s->start_freq[ch], block->end_freq[ch],
1053 3677 ff_ac3_fast_gain_tab[s->fast_gain_code[ch]],
1054 3677 ch == s->lfe_channel,
1055 DBA_NONE, 0, NULL, NULL, NULL,
1056 3677 block->mask[ch]);
1057 }
1058 }
1059 }
1060 1243 }
1061
1062
1063 /*
1064 * Ensure that bap for each block and channel point to the current bap_buffer.
1065 * They may have been switched during the bit allocation search.
1066 */
1067 11831 static void reset_block_bap(AC3EncodeContext *s)
1068 {
1069 int blk, ch;
1070 uint8_t *ref_bap;
1071
1072
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11831 if (s->ref_bap[0][0] == s->bap_buffer && s->ref_bap_set)
1073 4007 return;
1074
1075 7824 ref_bap = s->bap_buffer;
1076
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27947 for (ch = 0; ch <= s->channels; ch++) {
1077
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140861 for (blk = 0; blk < s->num_blocks; blk++)
1078 120738 s->ref_bap[ch][blk] = ref_bap + AC3_MAX_COEFS * s->exp_ref_block[ch][blk];
1079 20123 ref_bap += AC3_MAX_COEFS * s->num_blocks;
1080 }
1081 7824 s->ref_bap_set = 1;
1082 }
1083
1084
1085 /**
1086 * Initialize mantissa counts.
1087 * These are set so that they are padded to the next whole group size when bits
1088 * are counted in compute_mantissa_size.
1089 *
1090 * @param[in,out] mant_cnt running counts for each bap value for each block
1091 */
1092 10588 static void count_mantissa_bits_init(uint16_t mant_cnt[AC3_MAX_BLOCKS][16])
1093 {
1094 int blk;
1095
1096
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74116 for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) {
1097 63528 memset(mant_cnt[blk], 0, sizeof(mant_cnt[blk]));
1098 63528 mant_cnt[blk][1] = mant_cnt[blk][2] = 2;
1099 63528 mant_cnt[blk][4] = 1;
1100 }
1101 10588 }
1102
1103
1104 /**
1105 * Update mantissa bit counts for all blocks in 1 channel in a given bandwidth
1106 * range.
1107 *
1108 * @param s AC-3 encoder private context
1109 * @param ch channel index
1110 * @param[in,out] mant_cnt running counts for each bap value for each block
1111 * @param start starting coefficient bin
1112 * @param end ending coefficient bin
1113 */
1114 22680 static void count_mantissa_bits_update_ch(AC3EncodeContext *s, int ch,
1115 uint16_t mant_cnt[AC3_MAX_BLOCKS][16],
1116 int start, int end)
1117 {
1118 int blk;
1119
1120
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158760 for (blk = 0; blk < s->num_blocks; blk++) {
1121 136080 AC3Block *block = &s->blocks[blk];
1122
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136080 if (ch == CPL_CH && !block->cpl_in_use)
1123 continue;
1124 136080 s->ac3dsp.update_bap_counts(mant_cnt[blk],
1125 136080 s->ref_bap[ch][blk] + start,
1126 136080 FFMIN(end, block->end_freq[ch]) - start);
1127 }
1128 22680 }
1129
1130
1131 /*
1132 * Count the number of mantissa bits in the frame based on the bap values.
1133 */
1134 10588 static int count_mantissa_bits(AC3EncodeContext *s)
1135 {
1136 int ch, max_end_freq;
1137 10588 LOCAL_ALIGNED_16(uint16_t, mant_cnt, [AC3_MAX_BLOCKS], [16]);
1138
1139 10588 count_mantissa_bits_init(mant_cnt);
1140
1141 10588 max_end_freq = s->bandwidth_code * 3 + 73;
1142
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33268 for (ch = !s->cpl_enabled; ch <= s->channels; ch++)
1143 22680 count_mantissa_bits_update_ch(s, ch, mant_cnt, s->start_freq[ch],
1144 max_end_freq);
1145
1146 10588 return s->ac3dsp.compute_mantissa_size(mant_cnt);
1147 }
1148
1149
1150 /**
1151 * Run the bit allocation with a given SNR offset.
1152 * This calculates the bit allocation pointers that will be used to determine
1153 * the quantization of each mantissa.
1154 *
1155 * @param s AC-3 encoder private context
1156 * @param snr_offset SNR offset, 0 to 1023
1157 * @return the number of bits needed for mantissas if the given SNR offset is
1158 * is used.
1159 */
1160 10588 static int bit_alloc(AC3EncodeContext *s, int snr_offset)
1161 {
1162 int blk, ch;
1163
1164 10588 snr_offset = (snr_offset - 240) * 4;
1165
1166 10588 reset_block_bap(s);
1167
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74116 for (blk = 0; blk < s->num_blocks; blk++) {
1168 63528 AC3Block *block = &s->blocks[blk];
1169
1170
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199608 for (ch = !block->cpl_in_use; ch <= s->channels; ch++) {
1171 /* Currently the only bit allocation parameters which vary across
1172 blocks within a frame are the exponent values. We can take
1173 advantage of that by reusing the bit allocation pointers
1174 whenever we reuse exponents. */
1175
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136080 if (s->exp_strategy[ch][blk] != EXP_REUSE) {
1176 31389 s->ac3dsp.bit_alloc_calc_bap(block->mask[ch], block->psd[ch],
1177 s->start_freq[ch], block->end_freq[ch],
1178 snr_offset, s->bit_alloc.floor,
1179 ff_ac3_bap_tab, s->ref_bap[ch][blk]);
1180 }
1181 }
1182 }
1183 10588 return count_mantissa_bits(s);
1184 }
1185
1186
1187 /*
1188 * Constant bitrate bit allocation search.
1189 * Find the largest SNR offset that will allow data to fit in the frame.
1190 */
1191 1243 static int cbr_bit_allocation(AC3EncodeContext *s)
1192 {
1193 int ch;
1194 int bits_left;
1195 int snr_offset, snr_incr;
1196
1197 1243 bits_left = 8 * s->frame_size - (s->frame_bits + s->exponent_bits);
1198
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1243 if (bits_left < 0)
1199 return AVERROR(EINVAL);
1200
1201 1243 snr_offset = s->coarse_snr_offset << 4;
1202
1203 /* if previous frame SNR offset was 1023, check if current frame can also
1204 use SNR offset of 1023. if so, skip the search. */
1205
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1243 if ((snr_offset | s->fine_snr_offset[1]) == 1023) {
1206 if (bit_alloc(s, 1023) <= bits_left)
1207 return 0;
1208 }
1209
1210
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3042 while (snr_offset >= 0 &&
1211 1521 bit_alloc(s, snr_offset) > bits_left) {
1212 278 snr_offset -= 64;
1213 }
1214
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1243 if (snr_offset < 0)
1215 return AVERROR(EINVAL);
1216
1217 1243 FFSWAP(uint8_t *, s->bap_buffer, s->bap1_buffer);
1218
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6215 for (snr_incr = 64; snr_incr > 0; snr_incr >>= 2) {
1219
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18134 while (snr_offset + snr_incr <= 1023 &&
1220 9067 bit_alloc(s, snr_offset + snr_incr) <= bits_left) {
1221 4095 snr_offset += snr_incr;
1222 4095 FFSWAP(uint8_t *, s->bap_buffer, s->bap1_buffer);
1223 }
1224 }
1225 1243 FFSWAP(uint8_t *, s->bap_buffer, s->bap1_buffer);
1226 1243 reset_block_bap(s);
1227
1228 1243 s->coarse_snr_offset = snr_offset >> 4;
1229
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3924 for (ch = !s->cpl_on; ch <= s->channels; ch++)
1230 2681 s->fine_snr_offset[ch] = snr_offset & 0xF;
1231
1232 1243 return 0;
1233 }
1234
1235
1236 /*
1237 * Perform bit allocation search.
1238 * Finds the SNR offset value that maximizes quality and fits in the specified
1239 * frame size. Output is the SNR offset and a set of bit allocation pointers
1240 * used to quantize the mantissas.
1241 */
1242 1243 static int ac3_compute_bit_allocation(AC3EncodeContext *s)
1243 {
1244 1243 count_frame_bits(s);
1245
1246 1243 s->exponent_bits = count_exponent_bits(s);
1247
1248 1243 bit_alloc_masking(s);
1249
1250 1243 return cbr_bit_allocation(s);
1251 }
1252
1253
1254 /**
1255 * Symmetric quantization on 'levels' levels.
1256 *
1257 * @param c unquantized coefficient
1258 * @param e exponent
1259 * @param levels number of quantization levels
1260 * @return quantized coefficient
1261 */
1262 1070536 static inline int sym_quant(int c, int e, int levels)
1263 {
1264 1070536 int v = (((levels * c) >> (24 - e)) + levels) >> 1;
1265 av_assert2(v >= 0 && v < levels);
1266 1070536 return v;
1267 }
1268
1269
1270 /**
1271 * Asymmetric quantization on 2^qbits levels.
1272 *
1273 * @param c unquantized coefficient
1274 * @param e exponent
1275 * @param qbits number of quantization bits
1276 * @return quantized coefficient
1277 */
1278 153901 static inline int asym_quant(int c, int e, int qbits)
1279 {
1280 int m;
1281
1282 153901 c = (((c * (1<<e)) >> (24 - qbits)) + 1) >> 1;
1283 153901 m = (1 << (qbits-1));
1284
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153901 if (c >= m)
1285 160 c = m - 1;
1286 av_assert2(c >= -m);
1287 153901 return c;
1288 }
1289
1290
1291 /**
1292 * Quantize a set of mantissas for a single channel in a single block.
1293 *
1294 * @param s Mantissa count context
1295 * @param fixed_coef unquantized fixed-point coefficients
1296 * @param exp exponents
1297 * @param bap bit allocation pointer indices
1298 * @param[out] qmant quantized coefficients
1299 * @param start_freq starting coefficient bin
1300 * @param end_freq ending coefficient bin
1301 */
1302 16086 static void quantize_mantissas_blk_ch(AC3Mant *s, int32_t *fixed_coef,
1303 uint8_t *exp, uint8_t *bap,
1304 int16_t *qmant, int start_freq,
1305 int end_freq)
1306 {
1307 int i;
1308
1309
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1850754 for (i = start_freq; i < end_freq; i++) {
1310 1834668 int c = fixed_coef[i];
1311 1834668 int e = exp[i];
1312 1834668 int v = bap[i];
1313
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1834668 switch (v) {
1314 610231 case 0:
1315 610231 break;
1316 514693 case 1:
1317 514693 v = sym_quant(c, e, 3);
1318
3/3
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514693 switch (s->mant1_cnt) {
1319 173827 case 0:
1320 173827 s->qmant1_ptr = &qmant[i];
1321 173827 v = 9 * v;
1322 173827 s->mant1_cnt = 1;
1323 173827 break;
1324 171756 case 1:
1325 171756 *s->qmant1_ptr += 3 * v;
1326 171756 s->mant1_cnt = 2;
1327 171756 v = 128;
1328 171756 break;
1329 169110 default:
1330 169110 *s->qmant1_ptr += v;
1331 169110 s->mant1_cnt = 0;
1332 169110 v = 128;
1333 169110 break;
1334 }
1335 514693 break;
1336 198694 case 2:
1337 198694 v = sym_quant(c, e, 5);
1338
3/3
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198694 switch (s->mant2_cnt) {
1339 68443 case 0:
1340 68443 s->qmant2_ptr = &qmant[i];
1341 68443 v = 25 * v;
1342 68443 s->mant2_cnt = 1;
1343 68443 break;
1344 66236 case 1:
1345 66236 *s->qmant2_ptr += 5 * v;
1346 66236 s->mant2_cnt = 2;
1347 66236 v = 128;
1348 66236 break;
1349 64015 default:
1350 64015 *s->qmant2_ptr += v;
1351 64015 s->mant2_cnt = 0;
1352 64015 v = 128;
1353 64015 break;
1354 }
1355 198694 break;
1356 203034 case 3:
1357 203034 v = sym_quant(c, e, 7);
1358 203034 break;
1359 89224 case 4:
1360 89224 v = sym_quant(c, e, 11);
1361
2/2
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89224 switch (s->mant4_cnt) {
1362 45879 case 0:
1363 45879 s->qmant4_ptr = &qmant[i];
1364 45879 v = 11 * v;
1365 45879 s->mant4_cnt = 1;
1366 45879 break;
1367 43345 default:
1368 43345 *s->qmant4_ptr += v;
1369 43345 s->mant4_cnt = 0;
1370 43345 v = 128;
1371 43345 break;
1372 }
1373 89224 break;
1374 64891 case 5:
1375 64891 v = sym_quant(c, e, 15);
1376 64891 break;
1377 12130 case 14:
1378 12130 v = asym_quant(c, e, 14);
1379 12130 break;
1380 7230 case 15:
1381 7230 v = asym_quant(c, e, 16);
1382 7230 break;
1383 134541 default:
1384 134541 v = asym_quant(c, e, v - 1);
1385 134541 break;
1386 }
1387 1834668 qmant[i] = v;
1388 }
1389 16086 }
1390
1391
1392 /**
1393 * Quantize mantissas using coefficients, exponents, and bit allocation pointers.
1394 *
1395 * @param s AC-3 encoder private context
1396 */
1397 1243 static void ac3_quantize_mantissas(AC3EncodeContext *s)
1398 {
1399 1243 int blk, ch, ch0=0, got_cpl;
1400
1401
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8701 for (blk = 0; blk < s->num_blocks; blk++) {
1402 7458 AC3Block *block = &s->blocks[blk];
1403 7458 AC3Mant m = { 0 };
1404
1405 7458 got_cpl = !block->cpl_in_use;
1406
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23544 for (ch = 1; ch <= s->channels; ch++) {
1407
5/6
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✗ Branch 5 not taken.
16086 if (!got_cpl && ch > 1 && block->channel_in_cpl[ch-1]) {
1408 4314 ch0 = ch - 1;
1409 4314 ch = CPL_CH;
1410 4314 got_cpl = 1;
1411 }
1412 16086 quantize_mantissas_blk_ch(&m, block->fixed_coef[ch],
1413 16086 s->blocks[s->exp_ref_block[ch][blk]].exp[ch],
1414 16086 s->ref_bap[ch][blk], block->qmant[ch],
1415 s->start_freq[ch], block->end_freq[ch]);
1416
2/2
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16086 if (ch == CPL_CH)
1417 4314 ch = ch0;
1418 }
1419 }
1420 1243 }
1421
1422
1423 /*
1424 * Write the AC-3 frame header to the output bitstream.
1425 */
1426 970 static void ac3_output_frame_header(AC3EncodeContext *s)
1427 {
1428 970 AC3EncOptions *opt = &s->options;
1429
1430 970 put_bits(&s->pb, 16, 0x0b77); /* frame header */
1431 970 put_bits(&s->pb, 16, 0); /* crc1: will be filled later */
1432 970 put_bits(&s->pb, 2, s->bit_alloc.sr_code);
1433 970 put_bits(&s->pb, 6, s->frame_size_code + (s->frame_size - s->frame_size_min) / 2);
1434 970 put_bits(&s->pb, 5, s->bitstream_id);
1435 970 put_bits(&s->pb, 3, s->bitstream_mode);
1436 970 put_bits(&s->pb, 3, s->channel_mode);
1437
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970 if ((s->channel_mode & 0x01) && s->channel_mode != AC3_CHMODE_MONO)
1438 put_bits(&s->pb, 2, s->center_mix_level);
1439
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970 if (s->channel_mode & 0x04)
1440 put_bits(&s->pb, 2, s->surround_mix_level);
1441
2/2
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970 if (s->channel_mode == AC3_CHMODE_STEREO)
1442 446 put_bits(&s->pb, 2, opt->dolby_surround_mode);
1443 970 put_bits(&s->pb, 1, s->lfe_on); /* LFE */
1444 970 put_bits(&s->pb, 5, -opt->dialogue_level);
1445 970 put_bits(&s->pb, 1, 0); /* no compression control word */
1446 970 put_bits(&s->pb, 1, 0); /* no lang code */
1447 970 put_bits(&s->pb, 1, opt->audio_production_info);
1448
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970 if (opt->audio_production_info) {
1449 put_bits(&s->pb, 5, opt->mixing_level - 80);
1450 put_bits(&s->pb, 2, opt->room_type);
1451 }
1452 970 put_bits(&s->pb, 1, opt->copyright);
1453 970 put_bits(&s->pb, 1, opt->original);
1454
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970 if (s->bitstream_id == 6) {
1455 /* alternate bit stream syntax */
1456 put_bits(&s->pb, 1, opt->extended_bsi_1);
1457 if (opt->extended_bsi_1) {
1458 put_bits(&s->pb, 2, opt->preferred_stereo_downmix);
1459 put_bits(&s->pb, 3, s->ltrt_center_mix_level);
1460 put_bits(&s->pb, 3, s->ltrt_surround_mix_level);
1461 put_bits(&s->pb, 3, s->loro_center_mix_level);
1462 put_bits(&s->pb, 3, s->loro_surround_mix_level);
1463 }
1464 put_bits(&s->pb, 1, opt->extended_bsi_2);
1465 if (opt->extended_bsi_2) {
1466 put_bits(&s->pb, 2, opt->dolby_surround_ex_mode);
1467 put_bits(&s->pb, 2, opt->dolby_headphone_mode);
1468 put_bits(&s->pb, 1, opt->ad_converter_type);
1469 put_bits(&s->pb, 9, 0); /* xbsi2 and encinfo : reserved */
1470 }
1471 } else {
1472 970 put_bits(&s->pb, 1, 0); /* no time code 1 */
1473 970 put_bits(&s->pb, 1, 0); /* no time code 2 */
1474 }
1475 970 put_bits(&s->pb, 1, 0); /* no additional bit stream info */
1476 970 }
1477
1478
1479 /*
1480 * Write one audio block to the output bitstream.
1481 */
1482 7458 static void output_audio_block(AC3EncodeContext *s, int blk)
1483 {
1484 7458 int ch, i, baie, bnd, got_cpl, av_uninit(ch0);
1485 7458 AC3Block *block = &s->blocks[blk];
1486
1487 /* block switching */
1488
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7458 if (!s->eac3) {
1489
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14316 for (ch = 0; ch < s->fbw_channels; ch++)
1490 8496 put_bits(&s->pb, 1, 0);
1491 }
1492
1493 /* dither flags */
1494
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7458 if (!s->eac3) {
1495
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14316 for (ch = 0; ch < s->fbw_channels; ch++)
1496 8496 put_bits(&s->pb, 1, 1);
1497 }
1498
1499 /* dynamic range codes */
1500 7458 put_bits(&s->pb, 1, 0);
1501
1502 /* spectral extension */
1503
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7458 if (s->eac3)
1504 1638 put_bits(&s->pb, 1, 0);
1505
1506 /* channel coupling */
1507
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7458 if (!s->eac3)
1508 5820 put_bits(&s->pb, 1, block->new_cpl_strategy);
1509
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7458 if (block->new_cpl_strategy) {
1510
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1243 if (!s->eac3)
1511 970 put_bits(&s->pb, 1, block->cpl_in_use);
1512
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1243 if (block->cpl_in_use) {
1513 int start_sub, end_sub;
1514
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719 if (s->eac3)
1515 273 put_bits(&s->pb, 1, 0); /* enhanced coupling */
1516
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719 if (!s->eac3 || s->channel_mode != AC3_CHMODE_STEREO) {
1517
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1338 for (ch = 1; ch <= s->fbw_channels; ch++)
1518 892 put_bits(&s->pb, 1, block->channel_in_cpl[ch]);
1519 }
1520
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719 if (s->channel_mode == AC3_CHMODE_STEREO)
1521 719 put_bits(&s->pb, 1, 0); /* phase flags in use */
1522 719 start_sub = (s->start_freq[CPL_CH] - 37) / 12;
1523 719 end_sub = (s->cpl_end_freq - 37) / 12;
1524 719 put_bits(&s->pb, 4, start_sub);
1525 719 put_bits(&s->pb, 4, end_sub - 3);
1526 /* coupling band structure */
1527
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719 if (s->eac3) {
1528 273 put_bits(&s->pb, 1, 0); /* use default */
1529 } else {
1530
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2230 for (bnd = start_sub+1; bnd < end_sub; bnd++)
1531 1784 put_bits(&s->pb, 1, ff_eac3_default_cpl_band_struct[bnd]);
1532 }
1533 }
1534 }
1535
1536 /* coupling coordinates */
1537
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7458 if (block->cpl_in_use) {
1538
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12942 for (ch = 1; ch <= s->fbw_channels; ch++) {
1539
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8628 if (block->channel_in_cpl[ch]) {
1540
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8628 if (!s->eac3 || block->new_cpl_coords[ch] != 2)
1541 8082 put_bits(&s->pb, 1, block->new_cpl_coords[ch]);
1542
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8628 if (block->new_cpl_coords[ch]) {
1543 1470 put_bits(&s->pb, 2, block->cpl_master_exp[ch]);
1544
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7350 for (bnd = 0; bnd < s->num_cpl_bands; bnd++) {
1545 5880 put_bits(&s->pb, 4, block->cpl_coord_exp [ch][bnd]);
1546 5880 put_bits(&s->pb, 4, block->cpl_coord_mant[ch][bnd]);
1547 }
1548 }
1549 }
1550 }
1551 }
1552
1553 /* stereo rematrixing */
1554
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7458 if (s->channel_mode == AC3_CHMODE_STEREO) {
1555
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4314 if (!s->eac3 || blk > 0)
1556 4041 put_bits(&s->pb, 1, block->new_rematrixing_strategy);
1557
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4314 if (block->new_rematrixing_strategy) {
1558 /* rematrixing flags */
1559
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10985 for (bnd = 0; bnd < block->num_rematrixing_bands; bnd++)
1560 8788 put_bits(&s->pb, 1, block->rematrixing_flags[bnd]);
1561 }
1562 }
1563
1564 /* exponent strategy */
1565
2/2
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7458 if (!s->eac3) {
1566
2/2
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16992 for (ch = !block->cpl_in_use; ch <= s->fbw_channels; ch++)
1567 11172 put_bits(&s->pb, 2, s->exp_strategy[ch][blk]);
1568
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5820 if (s->lfe_on)
1569 put_bits(&s->pb, 1, s->exp_strategy[s->lfe_channel][blk]);
1570 }
1571
1572 /* bandwidth */
1573
2/2
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19230 for (ch = 1; ch <= s->fbw_channels; ch++) {
1574
4/4
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✓ Branch 2 taken 746 times.
✓ Branch 3 taken 1529 times.
11772 if (s->exp_strategy[ch][blk] != EXP_REUSE && !block->channel_in_cpl[ch])
1575 746 put_bits(&s->pb, 6, s->bandwidth_code);
1576 }
1577
1578 /* exponents */
1579
2/2
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23544 for (ch = !block->cpl_in_use; ch <= s->channels; ch++) {
1580 int nb_groups;
1581 16086 int cpl = (ch == CPL_CH);
1582
1583
2/2
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16086 if (s->exp_strategy[ch][blk] == EXP_REUSE)
1584 12409 continue;
1585
1586 /* DC exponent */
1587 3677 put_bits(&s->pb, 4, block->grouped_exp[ch][0] >> cpl);
1588
1589 /* exponent groups */
1590 3677 nb_groups = exponent_group_tab[cpl][s->exp_strategy[ch][blk]-1][block->end_freq[ch]-s->start_freq[ch]];
1591
2/2
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111445 for (i = 1; i <= nb_groups; i++)
1592 107768 put_bits(&s->pb, 7, block->grouped_exp[ch][i]);
1593
1594 /* gain range info */
1595
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3677 if (ch != s->lfe_channel && !cpl)
1596 2275 put_bits(&s->pb, 2, 0);
1597 }
1598
1599 /* bit allocation info */
1600
2/2
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7458 if (!s->eac3) {
1601 5820 baie = (blk == 0);
1602 5820 put_bits(&s->pb, 1, baie);
1603
2/2
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5820 if (baie) {
1604 970 put_bits(&s->pb, 2, s->slow_decay_code);
1605 970 put_bits(&s->pb, 2, s->fast_decay_code);
1606 970 put_bits(&s->pb, 2, s->slow_gain_code);
1607 970 put_bits(&s->pb, 2, s->db_per_bit_code);
1608 970 put_bits(&s->pb, 3, s->floor_code);
1609 }
1610 }
1611
1612 /* snr offset */
1613
2/2
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7458 if (!s->eac3) {
1614 5820 put_bits(&s->pb, 1, block->new_snr_offsets);
1615
2/2
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5820 if (block->new_snr_offsets) {
1616 970 put_bits(&s->pb, 6, s->coarse_snr_offset);
1617
2/2
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2832 for (ch = !block->cpl_in_use; ch <= s->channels; ch++) {
1618 1862 put_bits(&s->pb, 4, s->fine_snr_offset[ch]);
1619 1862 put_bits(&s->pb, 3, s->fast_gain_code[ch]);
1620 }
1621 }
1622 } else {
1623 1638 put_bits(&s->pb, 1, 0); /* no converter snr offset */
1624 }
1625
1626 /* coupling leak */
1627
2/2
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7458 if (block->cpl_in_use) {
1628
4/4
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✓ Branch 2 taken 1365 times.
✓ Branch 3 taken 273 times.
4314 if (!s->eac3 || block->new_cpl_leak != 2)
1629 4041 put_bits(&s->pb, 1, block->new_cpl_leak);
1630
2/2
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4314 if (block->new_cpl_leak) {
1631 719 put_bits(&s->pb, 3, s->bit_alloc.cpl_fast_leak);
1632 719 put_bits(&s->pb, 3, s->bit_alloc.cpl_slow_leak);
1633 }
1634 }
1635
1636
2/2
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7458 if (!s->eac3) {
1637 5820 put_bits(&s->pb, 1, 0); /* no delta bit allocation */
1638 5820 put_bits(&s->pb, 1, 0); /* no data to skip */
1639 }
1640
1641 /* mantissas */
1642 7458 got_cpl = !block->cpl_in_use;
1643
2/2
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23544 for (ch = 1; ch <= s->channels; ch++) {
1644 int b, q;
1645
1646
5/6
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✓ Branch 3 taken 4314 times.
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✗ Branch 5 not taken.
16086 if (!got_cpl && ch > 1 && block->channel_in_cpl[ch-1]) {
1647 4314 ch0 = ch - 1;
1648 4314 ch = CPL_CH;
1649 4314 got_cpl = 1;
1650 }
1651
2/2
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1850754 for (i = s->start_freq[ch]; i < block->end_freq[ch]; i++) {
1652 1834668 q = block->qmant[ch][i];
1653 1834668 b = s->ref_bap[ch][blk][i];
1654
8/8
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✓ Branch 7 taken 199432 times.
1834668 switch (b) {
1655 610231 case 0: break;
1656
2/2
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✓ Branch 1 taken 340866 times.
514693 case 1: if (q != 128) put_bits (&s->pb, 5, q); break;
1657
2/2
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✓ Branch 1 taken 130251 times.
198694 case 2: if (q != 128) put_bits (&s->pb, 7, q); break;
1658 203034 case 3: put_sbits(&s->pb, 3, q); break;
1659
2/2
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89224 case 4: if (q != 128) put_bits (&s->pb, 7, q); break;
1660 12130 case 14: put_sbits(&s->pb, 14, q); break;
1661 7230 case 15: put_sbits(&s->pb, 16, q); break;
1662 199432 default: put_sbits(&s->pb, b-1, q); break;
1663 }
1664 }
1665
2/2
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✓ Branch 1 taken 11772 times.
16086 if (ch == CPL_CH)
1666 4314 ch = ch0;
1667 }
1668 7458 }
1669
1670
1671 /** CRC-16 Polynomial */
1672 #define CRC16_POLY ((1 << 0) | (1 << 2) | (1 << 15) | (1 << 16))
1673
1674
1675 1264 static unsigned int mul_poly(unsigned int a, unsigned int b, unsigned int poly)
1676 {
1677 unsigned int c;
1678
1679 1264 c = 0;
1680
2/2
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✓ Branch 1 taken 1264 times.
20042 while (a) {
1681
2/2
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✓ Branch 1 taken 10066 times.
18778 if (a & 1)
1682 8712 c ^= b;
1683 18778 a = a >> 1;
1684 18778 b = b << 1;
1685
2/2
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✓ Branch 1 taken 9782 times.
18778 if (b & (1 << 16))
1686 8996 b ^= poly;
1687 }
1688 1264 return c;
1689 }
1690
1691
1692 20 static unsigned int pow_poly(unsigned int a, unsigned int n, unsigned int poly)
1693 {
1694 unsigned int r;
1695 20 r = 1;
1696
2/2
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258 while (n) {
1697
2/2
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238 if (n & 1)
1698 56 r = mul_poly(r, a, poly);
1699 238 a = mul_poly(a, a, poly);
1700 238 n >>= 1;
1701 }
1702 20 return r;
1703 }
1704
1705
1706 /*
1707 * Fill the end of the frame with 0's and compute the two CRCs.
1708 */
1709 1243 static void output_frame_end(AC3EncodeContext *s)
1710 {
1711 1243 const AVCRC *crc_ctx = av_crc_get_table(AV_CRC_16_ANSI);
1712 int frame_size_58, pad_bytes, crc1, crc2_partial, crc2, crc_inv;
1713 uint8_t *frame;
1714
1715 1243 frame_size_58 = ((s->frame_size >> 2) + (s->frame_size >> 4)) << 1;
1716
1717 /* pad the remainder of the frame with zeros */
1718 av_assert2(s->frame_size * 8 - put_bits_count(&s->pb) >= 18);
1719 1243 flush_put_bits(&s->pb);
1720 1243 frame = s->pb.buf;
1721 1243 pad_bytes = s->frame_size - (put_bits_ptr(&s->pb) - frame) - 2;
1722 av_assert2(pad_bytes >= 0);
1723
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1243 if (pad_bytes > 0)
1724 1085 memset(put_bits_ptr(&s->pb), 0, pad_bytes);
1725
1726
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1243 if (s->eac3) {
1727 /* compute crc2 */
1728 273 crc2_partial = av_crc(crc_ctx, 0, frame + 2, s->frame_size - 5);
1729 } else {
1730 /* compute crc1 */
1731 /* this is not so easy because it is at the beginning of the data... */
1732 970 crc1 = av_bswap16(av_crc(crc_ctx, 0, frame + 4, frame_size_58 - 4));
1733 970 crc_inv = s->crc_inv[s->frame_size > s->frame_size_min];
1734 970 crc1 = mul_poly(crc_inv, crc1, CRC16_POLY);
1735 970 AV_WB16(frame + 2, crc1);
1736
1737 /* compute crc2 */
1738 970 crc2_partial = av_crc(crc_ctx, 0, frame + frame_size_58,
1739 970 s->frame_size - frame_size_58 - 3);
1740 }
1741 1243 crc2 = av_crc(crc_ctx, crc2_partial, frame + s->frame_size - 3, 1);
1742 /* ensure crc2 does not match sync word by flipping crcrsv bit if needed */
1743
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1243 if (crc2 == 0x770B) {
1744 frame[s->frame_size - 3] ^= 0x1;
1745 crc2 = av_crc(crc_ctx, crc2_partial, frame + s->frame_size - 3, 1);
1746 }
1747 1243 crc2 = av_bswap16(crc2);
1748 1243 AV_WB16(frame + s->frame_size - 2, crc2);
1749 1243 }
1750
1751
1752 /**
1753 * Write the frame to the output bitstream.
1754 *
1755 * @param s AC-3 encoder private context
1756 * @param frame output data buffer
1757 */
1758 1243 static void ac3_output_frame(AC3EncodeContext *s, unsigned char *frame)
1759 {
1760 int blk;
1761
1762 1243 init_put_bits(&s->pb, frame, s->frame_size);
1763
1764 1243 s->output_frame_header(s);
1765
1766
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8701 for (blk = 0; blk < s->num_blocks; blk++)
1767 7458 output_audio_block(s, blk);
1768
1769 1243 output_frame_end(s);
1770 1243 }
1771
1772 1243 int ff_ac3_encode_frame_common_end(AVCodecContext *avctx, AVPacket *avpkt,
1773 const AVFrame *frame, int *got_packet_ptr)
1774 {
1775 1243 AC3EncodeContext *const s = avctx->priv_data;
1776 int ret;
1777
1778 1243 ac3_apply_rematrixing(s);
1779
1780 1243 ac3_process_exponents(s);
1781
1782 1243 ret = ac3_compute_bit_allocation(s);
1783
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1243 if (ret) {
1784 av_log(avctx, AV_LOG_ERROR, "Bit allocation failed. Try increasing the bitrate.\n");
1785 return ret;
1786 }
1787
1788 1243 ac3_group_exponents(s);
1789
1790 1243 ac3_quantize_mantissas(s);
1791
1792 1243 ret = ff_get_encode_buffer(avctx, avpkt, s->frame_size, 0);
1793
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1243 if (ret < 0)
1794 return ret;
1795 1243 ac3_output_frame(s, avpkt->data);
1796
1797
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1243 if (frame->pts != AV_NOPTS_VALUE)
1798 1243 avpkt->pts = frame->pts - ff_samples_to_time_base(avctx, avctx->initial_padding);
1799
1800 1243 *got_packet_ptr = 1;
1801 1243 return 0;
1802 }
1803
1804 10 static void dprint_options(AC3EncodeContext *s)
1805 {
1806 #ifdef DEBUG
1807 AVCodecContext *avctx = s->avctx;
1808 AC3EncOptions *opt = &s->options;
1809 char strbuf[32];
1810
1811 switch (s->bitstream_id) {
1812 case 6: av_strlcpy(strbuf, "AC-3 (alt syntax)", 32); break;
1813 case 8: av_strlcpy(strbuf, "AC-3 (standard)", 32); break;
1814 case 9: av_strlcpy(strbuf, "AC-3 (dnet half-rate)", 32); break;
1815 case 10: av_strlcpy(strbuf, "AC-3 (dnet quater-rate)", 32); break;
1816 case 16: av_strlcpy(strbuf, "E-AC-3 (enhanced)", 32); break;
1817 default: snprintf(strbuf, 32, "ERROR");
1818 }
1819 ff_dlog(avctx, "bitstream_id: %s (%d)\n", strbuf, s->bitstream_id);
1820 ff_dlog(avctx, "sample_fmt: %s\n", av_get_sample_fmt_name(avctx->sample_fmt));
1821 av_channel_layout_describe(&avctx->ch_layout, strbuf, sizeof(strbuf));
1822 ff_dlog(avctx, "channel_layout: %s\n", strbuf);
1823 ff_dlog(avctx, "sample_rate: %d\n", s->sample_rate);
1824 ff_dlog(avctx, "bit_rate: %d\n", s->bit_rate);
1825 ff_dlog(avctx, "blocks/frame: %d (code=%d)\n", s->num_blocks, s->num_blks_code);
1826 if (s->cutoff)
1827 ff_dlog(avctx, "cutoff: %d\n", s->cutoff);
1828
1829 ff_dlog(avctx, "per_frame_metadata: %s\n",
1830 opt->allow_per_frame_metadata?"on":"off");
1831 if (s->has_center)
1832 ff_dlog(avctx, "center_mixlev: %0.3f (%d)\n", opt->center_mix_level,
1833 s->center_mix_level);
1834 else
1835 ff_dlog(avctx, "center_mixlev: {not written}\n");
1836 if (s->has_surround)
1837 ff_dlog(avctx, "surround_mixlev: %0.3f (%d)\n", opt->surround_mix_level,
1838 s->surround_mix_level);
1839 else
1840 ff_dlog(avctx, "surround_mixlev: {not written}\n");
1841 if (opt->audio_production_info) {
1842 ff_dlog(avctx, "mixing_level: %ddB\n", opt->mixing_level);
1843 switch (opt->room_type) {
1844 case AC3ENC_OPT_NOT_INDICATED: av_strlcpy(strbuf, "notindicated", 32); break;
1845 case AC3ENC_OPT_LARGE_ROOM: av_strlcpy(strbuf, "large", 32); break;
1846 case AC3ENC_OPT_SMALL_ROOM: av_strlcpy(strbuf, "small", 32); break;
1847 default: snprintf(strbuf, 32, "ERROR (%d)", opt->room_type);
1848 }
1849 ff_dlog(avctx, "room_type: %s\n", strbuf);
1850 } else {
1851 ff_dlog(avctx, "mixing_level: {not written}\n");
1852 ff_dlog(avctx, "room_type: {not written}\n");
1853 }
1854 ff_dlog(avctx, "copyright: %s\n", opt->copyright?"on":"off");
1855 ff_dlog(avctx, "dialnorm: %ddB\n", opt->dialogue_level);
1856 if (s->channel_mode == AC3_CHMODE_STEREO) {
1857 switch (opt->dolby_surround_mode) {
1858 case AC3ENC_OPT_NOT_INDICATED: av_strlcpy(strbuf, "notindicated", 32); break;
1859 case AC3ENC_OPT_MODE_ON: av_strlcpy(strbuf, "on", 32); break;
1860 case AC3ENC_OPT_MODE_OFF: av_strlcpy(strbuf, "off", 32); break;
1861 default: snprintf(strbuf, 32, "ERROR (%d)", opt->dolby_surround_mode);
1862 }
1863 ff_dlog(avctx, "dsur_mode: %s\n", strbuf);
1864 } else {
1865 ff_dlog(avctx, "dsur_mode: {not written}\n");
1866 }
1867 ff_dlog(avctx, "original: %s\n", opt->original?"on":"off");
1868
1869 if (s->bitstream_id == 6) {
1870 if (opt->extended_bsi_1) {
1871 switch (opt->preferred_stereo_downmix) {
1872 case AC3ENC_OPT_NOT_INDICATED: av_strlcpy(strbuf, "notindicated", 32); break;
1873 case AC3ENC_OPT_DOWNMIX_LTRT: av_strlcpy(strbuf, "ltrt", 32); break;
1874 case AC3ENC_OPT_DOWNMIX_LORO: av_strlcpy(strbuf, "loro", 32); break;
1875 default: snprintf(strbuf, 32, "ERROR (%d)", opt->preferred_stereo_downmix);
1876 }
1877 ff_dlog(avctx, "dmix_mode: %s\n", strbuf);
1878 ff_dlog(avctx, "ltrt_cmixlev: %0.3f (%d)\n",
1879 opt->ltrt_center_mix_level, s->ltrt_center_mix_level);
1880 ff_dlog(avctx, "ltrt_surmixlev: %0.3f (%d)\n",
1881 opt->ltrt_surround_mix_level, s->ltrt_surround_mix_level);
1882 ff_dlog(avctx, "loro_cmixlev: %0.3f (%d)\n",
1883 opt->loro_center_mix_level, s->loro_center_mix_level);
1884 ff_dlog(avctx, "loro_surmixlev: %0.3f (%d)\n",
1885 opt->loro_surround_mix_level, s->loro_surround_mix_level);
1886 } else {
1887 ff_dlog(avctx, "extended bitstream info 1: {not written}\n");
1888 }
1889 if (opt->extended_bsi_2) {
1890 switch (opt->dolby_surround_ex_mode) {
1891 case AC3ENC_OPT_NOT_INDICATED: av_strlcpy(strbuf, "notindicated", 32); break;
1892 case AC3ENC_OPT_MODE_ON: av_strlcpy(strbuf, "on", 32); break;
1893 case AC3ENC_OPT_MODE_OFF: av_strlcpy(strbuf, "off", 32); break;
1894 default: snprintf(strbuf, 32, "ERROR (%d)", opt->dolby_surround_ex_mode);
1895 }
1896 ff_dlog(avctx, "dsurex_mode: %s\n", strbuf);
1897 switch (opt->dolby_headphone_mode) {
1898 case AC3ENC_OPT_NOT_INDICATED: av_strlcpy(strbuf, "notindicated", 32); break;
1899 case AC3ENC_OPT_MODE_ON: av_strlcpy(strbuf, "on", 32); break;
1900 case AC3ENC_OPT_MODE_OFF: av_strlcpy(strbuf, "off", 32); break;
1901 default: snprintf(strbuf, 32, "ERROR (%d)", opt->dolby_headphone_mode);
1902 }
1903 ff_dlog(avctx, "dheadphone_mode: %s\n", strbuf);
1904
1905 switch (opt->ad_converter_type) {
1906 case AC3ENC_OPT_ADCONV_STANDARD: av_strlcpy(strbuf, "standard", 32); break;
1907 case AC3ENC_OPT_ADCONV_HDCD: av_strlcpy(strbuf, "hdcd", 32); break;
1908 default: snprintf(strbuf, 32, "ERROR (%d)", opt->ad_converter_type);
1909 }
1910 ff_dlog(avctx, "ad_conv_type: %s\n", strbuf);
1911 } else {
1912 ff_dlog(avctx, "extended bitstream info 2: {not written}\n");
1913 }
1914 }
1915 #endif
1916 10 }
1917
1918
1919 #define FLT_OPTION_THRESHOLD 0.01
1920
1921 static int validate_float_option(float v, const float *v_list, int v_list_size)
1922 {
1923 int i;
1924
1925 for (i = 0; i < v_list_size; i++) {
1926 if (v < (v_list[i] + FLT_OPTION_THRESHOLD) &&
1927 v > (v_list[i] - FLT_OPTION_THRESHOLD))
1928 break;
1929 }
1930 if (i == v_list_size)
1931 return AVERROR(EINVAL);
1932
1933 return i;
1934 }
1935
1936
1937 static void validate_mix_level(void *log_ctx, const char *opt_name,
1938 float *opt_param, const float *list,
1939 int list_size, int default_value, int min_value,
1940 int *ctx_param)
1941 {
1942 int mixlev = validate_float_option(*opt_param, list, list_size);
1943 if (mixlev < min_value) {
1944 mixlev = default_value;
1945 if (*opt_param >= 0.0) {
1946 av_log(log_ctx, AV_LOG_WARNING, "requested %s is not valid. using "
1947 "default value: %0.3f\n", opt_name, list[mixlev]);
1948 }
1949 }
1950 *opt_param = list[mixlev];
1951 *ctx_param = mixlev;
1952 }
1953
1954
1955 /**
1956 * Validate metadata options as set by AVOption system.
1957 * These values can optionally be changed per-frame.
1958 *
1959 * @param s AC-3 encoder private context
1960 */
1961 10 int ff_ac3_validate_metadata(AC3EncodeContext *s)
1962 {
1963 10 AVCodecContext *avctx = s->avctx;
1964 10 AC3EncOptions *opt = &s->options;
1965
1966 10 opt->audio_production_info = 0;
1967 10 opt->extended_bsi_1 = 0;
1968 10 opt->extended_bsi_2 = 0;
1969 10 opt->eac3_mixing_metadata = 0;
1970 10 opt->eac3_info_metadata = 0;
1971
1972 /* determine mixing metadata / xbsi1 use */
1973
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10 if (s->channel_mode > AC3_CHMODE_STEREO && opt->preferred_stereo_downmix != AC3ENC_OPT_NONE) {
1974 opt->extended_bsi_1 = 1;
1975 opt->eac3_mixing_metadata = 1;
1976 }
1977
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10 if (s->has_center &&
1978 (opt->ltrt_center_mix_level >= 0 || opt->loro_center_mix_level >= 0)) {
1979 opt->extended_bsi_1 = 1;
1980 opt->eac3_mixing_metadata = 1;
1981 }
1982
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10 if (s->has_surround &&
1983 (opt->ltrt_surround_mix_level >= 0 || opt->loro_surround_mix_level >= 0)) {
1984 opt->extended_bsi_1 = 1;
1985 opt->eac3_mixing_metadata = 1;
1986 }
1987
1988
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10 if (s->eac3) {
1989 /* determine info metadata use */
1990
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1 if (avctx->audio_service_type != AV_AUDIO_SERVICE_TYPE_MAIN)
1991 opt->eac3_info_metadata = 1;
1992
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1 if (opt->copyright != AC3ENC_OPT_NONE || opt->original != AC3ENC_OPT_NONE)
1993 opt->eac3_info_metadata = 1;
1994
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1 if (s->channel_mode == AC3_CHMODE_STEREO &&
1995
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1 (opt->dolby_headphone_mode != AC3ENC_OPT_NONE || opt->dolby_surround_mode != AC3ENC_OPT_NONE))
1996 opt->eac3_info_metadata = 1;
1997
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1 if (s->channel_mode >= AC3_CHMODE_2F2R && opt->dolby_surround_ex_mode != AC3ENC_OPT_NONE)
1998 opt->eac3_info_metadata = 1;
1999
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1 if (opt->mixing_level != AC3ENC_OPT_NONE || opt->room_type != AC3ENC_OPT_NONE ||
2000
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1 opt->ad_converter_type != AC3ENC_OPT_NONE) {
2001 opt->audio_production_info = 1;
2002 opt->eac3_info_metadata = 1;
2003 }
2004 } else {
2005 /* determine audio production info use */
2006
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9 if (opt->mixing_level != AC3ENC_OPT_NONE || opt->room_type != AC3ENC_OPT_NONE)
2007 opt->audio_production_info = 1;
2008
2009 /* determine xbsi2 use */
2010
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9 if (s->channel_mode >= AC3_CHMODE_2F2R && opt->dolby_surround_ex_mode != AC3ENC_OPT_NONE)
2011 opt->extended_bsi_2 = 1;
2012
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9 if (s->channel_mode == AC3_CHMODE_STEREO && opt->dolby_headphone_mode != AC3ENC_OPT_NONE)
2013 opt->extended_bsi_2 = 1;
2014
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9 if (opt->ad_converter_type != AC3ENC_OPT_NONE)
2015 opt->extended_bsi_2 = 1;
2016 }
2017
2018 /* validate AC-3 mixing levels */
2019
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10 if (!s->eac3) {
2020
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9 if (s->has_center) {
2021 validate_mix_level(avctx, "center_mix_level", &opt->center_mix_level,
2022 cmixlev_options, CMIXLEV_NUM_OPTIONS, 1, 0,
2023 &s->center_mix_level);
2024 }
2025
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9 if (s->has_surround) {
2026 validate_mix_level(avctx, "surround_mix_level", &opt->surround_mix_level,
2027 surmixlev_options, SURMIXLEV_NUM_OPTIONS, 1, 0,
2028 &s->surround_mix_level);
2029 }
2030 }
2031
2032 /* validate extended bsi 1 / mixing metadata */
2033
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10 if (opt->extended_bsi_1 || opt->eac3_mixing_metadata) {
2034 /* default preferred stereo downmix */
2035 if (opt->preferred_stereo_downmix == AC3ENC_OPT_NONE)
2036 opt->preferred_stereo_downmix = AC3ENC_OPT_NOT_INDICATED;
2037 if (!s->eac3 || s->has_center) {
2038 /* validate Lt/Rt center mix level */
2039 validate_mix_level(avctx, "ltrt_center_mix_level",
2040 &opt->ltrt_center_mix_level, extmixlev_options,
2041 EXTMIXLEV_NUM_OPTIONS, 5, 0,
2042 &s->ltrt_center_mix_level);
2043 /* validate Lo/Ro center mix level */
2044 validate_mix_level(avctx, "loro_center_mix_level",
2045 &opt->loro_center_mix_level, extmixlev_options,
2046 EXTMIXLEV_NUM_OPTIONS, 5, 0,
2047 &s->loro_center_mix_level);
2048 }
2049 if (!s->eac3 || s->has_surround) {
2050 /* validate Lt/Rt surround mix level */
2051 validate_mix_level(avctx, "ltrt_surround_mix_level",
2052 &opt->ltrt_surround_mix_level, extmixlev_options,
2053 EXTMIXLEV_NUM_OPTIONS, 6, 3,
2054 &s->ltrt_surround_mix_level);
2055 /* validate Lo/Ro surround mix level */
2056 validate_mix_level(avctx, "loro_surround_mix_level",
2057 &opt->loro_surround_mix_level, extmixlev_options,
2058 EXTMIXLEV_NUM_OPTIONS, 6, 3,
2059 &s->loro_surround_mix_level);
2060 }
2061 }
2062
2063 /* validate audio service type / channels combination */
2064
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10 if ((avctx->audio_service_type == AV_AUDIO_SERVICE_TYPE_KARAOKE &&
2065 avctx->ch_layout.nb_channels == 1) ||
2066
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10 ((avctx->audio_service_type == AV_AUDIO_SERVICE_TYPE_COMMENTARY ||
2067
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10 avctx->audio_service_type == AV_AUDIO_SERVICE_TYPE_EMERGENCY ||
2068
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10 avctx->audio_service_type == AV_AUDIO_SERVICE_TYPE_VOICE_OVER)
2069 && avctx->ch_layout.nb_channels > 1)) {
2070 av_log(avctx, AV_LOG_ERROR, "invalid audio service type for the "
2071 "specified number of channels\n");
2072 return AVERROR(EINVAL);
2073 }
2074
2075 /* validate extended bsi 2 / info metadata */
2076
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10 if (opt->extended_bsi_2 || opt->eac3_info_metadata) {
2077 /* default dolby headphone mode */
2078 if (opt->dolby_headphone_mode == AC3ENC_OPT_NONE)
2079 opt->dolby_headphone_mode = AC3ENC_OPT_NOT_INDICATED;
2080 /* default dolby surround ex mode */
2081 if (opt->dolby_surround_ex_mode == AC3ENC_OPT_NONE)
2082 opt->dolby_surround_ex_mode = AC3ENC_OPT_NOT_INDICATED;
2083 /* default A/D converter type */
2084 if (opt->ad_converter_type == AC3ENC_OPT_NONE)
2085 opt->ad_converter_type = AC3ENC_OPT_ADCONV_STANDARD;
2086 }
2087
2088 /* copyright & original defaults */
2089
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10 if (!s->eac3 || opt->eac3_info_metadata) {
2090 /* default copyright */
2091
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9 if (opt->copyright == AC3ENC_OPT_NONE)
2092 9 opt->copyright = AC3ENC_OPT_OFF;
2093 /* default original */
2094
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9 if (opt->original == AC3ENC_OPT_NONE)
2095 9 opt->original = AC3ENC_OPT_ON;
2096 }
2097
2098 /* dolby surround mode default */
2099
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10 if (!s->eac3 || opt->eac3_info_metadata) {
2100
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9 if (opt->dolby_surround_mode == AC3ENC_OPT_NONE)
2101 9 opt->dolby_surround_mode = AC3ENC_OPT_NOT_INDICATED;
2102 }
2103
2104 /* validate audio production info */
2105
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10 if (opt->audio_production_info) {
2106 if (opt->mixing_level == AC3ENC_OPT_NONE) {
2107 av_log(avctx, AV_LOG_ERROR, "mixing_level must be set if "
2108 "room_type is set\n");
2109 return AVERROR(EINVAL);
2110 }
2111 if (opt->mixing_level < 80) {
2112 av_log(avctx, AV_LOG_ERROR, "invalid mixing level. must be between "
2113 "80dB and 111dB\n");
2114 return AVERROR(EINVAL);
2115 }
2116 /* default room type */
2117 if (opt->room_type == AC3ENC_OPT_NONE)
2118 opt->room_type = AC3ENC_OPT_NOT_INDICATED;
2119 }
2120
2121 /* set bitstream id for alternate bitstream syntax */
2122
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10 if (!s->eac3 && (opt->extended_bsi_1 || opt->extended_bsi_2)) {
2123 if (s->bitstream_id > 8 && s->bitstream_id < 11) {
2124 if (!s->warned_alternate_bitstream) {
2125 av_log(avctx, AV_LOG_WARNING, "alternate bitstream syntax is "
2126 "not compatible with reduced samplerates. writing of "
2127 "extended bitstream information will be disabled.\n");
2128 s->warned_alternate_bitstream = 1;
2129 }
2130 } else {
2131 s->bitstream_id = 6;
2132 }
2133 }
2134
2135 10 return 0;
2136 }
2137
2138
2139 /**
2140 * Finalize encoding and free any memory allocated by the encoder.
2141 *
2142 * @param avctx Codec context
2143 */
2144 10 av_cold int ff_ac3_encode_close(AVCodecContext *avctx)
2145 {
2146 int blk, ch;
2147 10 AC3EncodeContext *s = avctx->priv_data;
2148
2149 10 av_freep(&s->mdct_window);
2150 10 av_freep(&s->windowed_samples);
2151
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10 if (s->planar_samples)
2152
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23 for (ch = 0; ch < s->channels; ch++)
2153 13 av_freep(&s->planar_samples[ch]);
2154 10 av_freep(&s->planar_samples);
2155 10 av_freep(&s->bap_buffer);
2156 10 av_freep(&s->bap1_buffer);
2157 10 av_freep(&s->mdct_coef_buffer);
2158 10 av_freep(&s->fixed_coef_buffer);
2159 10 av_freep(&s->exp_buffer);
2160 10 av_freep(&s->grouped_exp_buffer);
2161 10 av_freep(&s->psd_buffer);
2162 10 av_freep(&s->band_psd_buffer);
2163 10 av_freep(&s->mask_buffer);
2164 10 av_freep(&s->qmant_buffer);
2165 10 av_freep(&s->cpl_coord_exp_buffer);
2166 10 av_freep(&s->cpl_coord_mant_buffer);
2167 10 av_freep(&s->fdsp);
2168
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70 for (blk = 0; blk < s->num_blocks; blk++) {
2169 60 AC3Block *block = &s->blocks[blk];
2170 60 av_freep(&block->mdct_coef);
2171 60 av_freep(&block->fixed_coef);
2172 60 av_freep(&block->exp);
2173 60 av_freep(&block->grouped_exp);
2174 60 av_freep(&block->psd);
2175 60 av_freep(&block->band_psd);
2176 60 av_freep(&block->mask);
2177 60 av_freep(&block->qmant);
2178 60 av_freep(&block->cpl_coord_exp);
2179 60 av_freep(&block->cpl_coord_mant);
2180 }
2181
2182 10 av_tx_uninit(&s->tx);
2183
2184 10 return 0;
2185 }
2186
2187
2188 /*
2189 * Set channel information during initialization.
2190 */
2191 10 static av_cold int set_channel_info(AVCodecContext *avctx)
2192 {
2193 10 AC3EncodeContext *s = avctx->priv_data;
2194 10 int channels = avctx->ch_layout.nb_channels;
2195 10 uint64_t mask = avctx->ch_layout.u.mask;
2196
2197
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10 if (channels < 1 || channels > AC3_MAX_CHANNELS)
2198 return AVERROR(EINVAL);
2199
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10 if (mask > 0x7FF)
2200 return AVERROR(EINVAL);
2201
2202
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10 if (!mask)
2203 av_channel_layout_default(&avctx->ch_layout, channels);
2204 10 mask = avctx->ch_layout.u.mask;
2205
2206 10 s->lfe_on = !!(mask & AV_CH_LOW_FREQUENCY);
2207 10 s->channels = channels;
2208 10 s->fbw_channels = channels - s->lfe_on;
2209
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10 s->lfe_channel = s->lfe_on ? s->fbw_channels + 1 : -1;
2210
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10 if (s->lfe_on)
2211 mask -= AV_CH_LOW_FREQUENCY;
2212
2213
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10 switch (mask) {
2214 7 case AV_CH_LAYOUT_MONO: s->channel_mode = AC3_CHMODE_MONO; break;
2215 3 case AV_CH_LAYOUT_STEREO: s->channel_mode = AC3_CHMODE_STEREO; break;
2216 case AV_CH_LAYOUT_SURROUND: s->channel_mode = AC3_CHMODE_3F; break;
2217 case AV_CH_LAYOUT_2_1: s->channel_mode = AC3_CHMODE_2F1R; break;
2218 case AV_CH_LAYOUT_4POINT0: s->channel_mode = AC3_CHMODE_3F1R; break;
2219 case AV_CH_LAYOUT_QUAD:
2220 case AV_CH_LAYOUT_2_2: s->channel_mode = AC3_CHMODE_2F2R; break;
2221 case AV_CH_LAYOUT_5POINT0:
2222 case AV_CH_LAYOUT_5POINT0_BACK: s->channel_mode = AC3_CHMODE_3F2R; break;
2223 default:
2224 return AVERROR(EINVAL);
2225 }
2226
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10 s->has_center = (s->channel_mode & 0x01) && s->channel_mode != AC3_CHMODE_MONO;
2227 10 s->has_surround = s->channel_mode & 0x04;
2228
2229 10 s->channel_map = ac3_enc_channel_map[s->channel_mode][s->lfe_on];
2230
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10 if (s->lfe_on)
2231 mask |= AV_CH_LOW_FREQUENCY;
2232 10 av_channel_layout_from_mask(&avctx->ch_layout, mask);
2233
2234 10 return 0;
2235 }
2236
2237
2238 10 static av_cold int validate_options(AC3EncodeContext *s)
2239 {
2240 10 AVCodecContext *avctx = s->avctx;
2241 int i, ret, max_sr;
2242
2243 /* validate channel layout */
2244
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10 if (!avctx->ch_layout.nb_channels) {
2245 av_log(avctx, AV_LOG_WARNING, "No channel layout specified. The "
2246 "encoder will guess the layout, but it "
2247 "might be incorrect.\n");
2248 }
2249 10 ret = set_channel_info(avctx);
2250
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10 if (ret) {
2251 av_log(avctx, AV_LOG_ERROR, "invalid channel layout\n");
2252 return ret;
2253 }
2254
2255 /* validate sample rate */
2256 /* note: max_sr could be changed from 2 to 5 for E-AC-3 once we find a
2257 decoder that supports half sample rate so we can validate that
2258 the generated files are correct. */
2259
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10 max_sr = s->eac3 ? 2 : 8;
2260
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20 for (i = 0; i <= max_sr; i++) {
2261
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20 if ((ff_ac3_sample_rate_tab[i % 3] >> (i / 3)) == avctx->sample_rate)
2262 10 break;
2263 }
2264
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10 if (i > max_sr) {
2265 av_log(avctx, AV_LOG_ERROR, "invalid sample rate\n");
2266 return AVERROR(EINVAL);
2267 }
2268 10 s->sample_rate = avctx->sample_rate;
2269 10 s->bit_alloc.sr_shift = i / 3;
2270 10 s->bit_alloc.sr_code = i % 3;
2271
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10 s->bitstream_id = s->eac3 ? 16 : 8 + s->bit_alloc.sr_shift;
2272
2273 /* select a default bit rate if not set by the user */
2274
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10 if (!avctx->bit_rate) {
2275
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6 switch (s->fbw_channels) {
2276 6 case 1: avctx->bit_rate = 96000; break;
2277 case 2: avctx->bit_rate = 192000; break;
2278 case 3: avctx->bit_rate = 320000; break;
2279 case 4: avctx->bit_rate = 384000; break;
2280 case 5: avctx->bit_rate = 448000; break;
2281 }
2282 }
2283
2284 /* validate bit rate */
2285
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10 if (s->eac3) {
2286 int max_br, min_br, wpf, min_br_code;
2287 int num_blks_code, num_blocks, frame_samples;
2288 long long min_br_dist;
2289
2290 /* calculate min/max bitrate */
2291 /* TODO: More testing with 3 and 2 blocks. All E-AC-3 samples I've
2292 found use either 6 blocks or 1 block, even though 2 or 3 blocks
2293 would work as far as the bit rate is concerned. */
2294
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1 for (num_blks_code = 3; num_blks_code >= 0; num_blks_code--) {
2295 1 num_blocks = ((int[]){ 1, 2, 3, 6 })[num_blks_code];
2296 1 frame_samples = AC3_BLOCK_SIZE * num_blocks;
2297 1 max_br = 2048 * s->sample_rate / frame_samples * 16;
2298 1 min_br = ((s->sample_rate + (frame_samples-1)) / frame_samples) * 16;
2299
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1 if (avctx->bit_rate <= max_br)
2300 1 break;
2301 }
2302
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1 if (avctx->bit_rate < min_br || avctx->bit_rate > max_br) {
2303 av_log(avctx, AV_LOG_ERROR, "invalid bit rate. must be %d to %d "
2304 "for this sample rate\n", min_br, max_br);
2305 return AVERROR(EINVAL);
2306 }
2307 1 s->num_blks_code = num_blks_code;
2308 1 s->num_blocks = num_blocks;
2309
2310 /* calculate words-per-frame for the selected bitrate */
2311 1 wpf = (avctx->bit_rate / 16) * frame_samples / s->sample_rate;
2312 av_assert1(wpf > 0 && wpf <= 2048);
2313
2314 /* find the closest AC-3 bitrate code to the selected bitrate.
2315 this is needed for lookup tables for bandwidth and coupling
2316 parameter selection */
2317 1 min_br_code = -1;
2318 1 min_br_dist = INT64_MAX;
2319
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20 for (i = 0; i < 19; i++) {
2320 19 long long br_dist = llabs(ff_ac3_bitrate_tab[i] * 1000 - avctx->bit_rate);
2321
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19 if (br_dist < min_br_dist) {
2322 9 min_br_dist = br_dist;
2323 9 min_br_code = i;
2324 }
2325 }
2326
2327 /* make sure the minimum frame size is below the average frame size */
2328 1 s->frame_size_code = min_br_code << 1;
2329
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1 while (wpf > 1 && wpf * s->sample_rate / AC3_FRAME_SIZE * 16 > avctx->bit_rate)
2330 wpf--;
2331 1 s->frame_size_min = 2 * wpf;
2332 } else {
2333 9 int best_br = 0, best_code = 0;
2334 9 long long best_diff = INT64_MAX;
2335
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65 for (i = 0; i < 19; i++) {
2336 65 int br = (ff_ac3_bitrate_tab[i] >> s->bit_alloc.sr_shift) * 1000;
2337 65 long long diff = llabs(br - avctx->bit_rate);
2338
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65 if (diff < best_diff) {
2339 65 best_br = br;
2340 65 best_code = i;
2341 65 best_diff = diff;
2342 }
2343
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65 if (!best_diff)
2344 9 break;
2345 }
2346 9 avctx->bit_rate = best_br;
2347 9 s->frame_size_code = best_code << 1;
2348 9 s->frame_size_min = 2 * ff_ac3_frame_size_tab[s->frame_size_code][s->bit_alloc.sr_code];
2349 9 s->num_blks_code = 0x3;
2350 9 s->num_blocks = 6;
2351 }
2352 10 s->bit_rate = avctx->bit_rate;
2353 10 s->frame_size = s->frame_size_min;
2354
2355 /* validate cutoff */
2356
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10 if (avctx->cutoff < 0) {
2357 av_log(avctx, AV_LOG_ERROR, "invalid cutoff frequency\n");
2358 return AVERROR(EINVAL);
2359 }
2360 10 s->cutoff = avctx->cutoff;
2361
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10 if (s->cutoff > (s->sample_rate >> 1))
2362 s->cutoff = s->sample_rate >> 1;
2363
2364 10 ret = ff_ac3_validate_metadata(s);
2365
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10 if (ret)
2366 return ret;
2367
2368
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20 s->rematrixing_enabled = s->options.stereo_rematrixing &&
2369
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10 (s->channel_mode == AC3_CHMODE_STEREO);
2370
2371
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20 s->cpl_enabled = s->options.channel_coupling &&
2372
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10 s->channel_mode >= AC3_CHMODE_STEREO;
2373
2374 10 return 0;
2375 }
2376
2377
2378 /*
2379 * Set bandwidth for all channels.
2380 * The user can optionally supply a cutoff frequency. Otherwise an appropriate
2381 * default value will be used.
2382 */
2383 10 static av_cold void set_bandwidth(AC3EncodeContext *s)
2384 {
2385 10 int blk, ch, av_uninit(cpl_start);
2386
2387
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10 if (s->cutoff) {
2388 /* calculate bandwidth based on user-specified cutoff frequency */
2389 int fbw_coeffs;
2390 fbw_coeffs = s->cutoff * 2 * AC3_MAX_COEFS / s->sample_rate;
2391 s->bandwidth_code = av_clip((fbw_coeffs - 73) / 3, 0, 60);
2392 } else {
2393 /* use default bandwidth setting */
2394 10 s->bandwidth_code = ac3_bandwidth_tab[s->fbw_channels-1][s->bit_alloc.sr_code][s->frame_size_code/2];
2395 }
2396
2397 /* set number of coefficients for each channel */
2398
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23 for (ch = 1; ch <= s->fbw_channels; ch++) {
2399 13 s->start_freq[ch] = 0;
2400
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91 for (blk = 0; blk < s->num_blocks; blk++)
2401 78 s->blocks[blk].end_freq[ch] = s->bandwidth_code * 3 + 73;
2402 }
2403 /* LFE channel always has 7 coefs */
2404
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10 if (s->lfe_on) {
2405 s->start_freq[s->lfe_channel] = 0;
2406 for (blk = 0; blk < s->num_blocks; blk++)
2407 s->blocks[blk].end_freq[ch] = 7;
2408 }
2409
2410 /* initialize coupling strategy */
2411
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10 if (s->cpl_enabled) {
2412
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3 if (s->options.cpl_start != AC3ENC_OPT_AUTO) {
2413 cpl_start = s->options.cpl_start;
2414 } else {
2415 3 cpl_start = ac3_coupling_start_tab[s->channel_mode-2][s->bit_alloc.sr_code][s->frame_size_code/2];
2416
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3 if (cpl_start < 0) {
2417 if (s->options.channel_coupling == AC3ENC_OPT_AUTO)
2418 s->cpl_enabled = 0;
2419 else
2420 cpl_start = 15;
2421 }
2422 }
2423 }
2424
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10 if (s->cpl_enabled) {
2425 int i, cpl_start_band, cpl_end_band;
2426 3 uint8_t *cpl_band_sizes = s->cpl_band_sizes;
2427
2428 3 cpl_end_band = s->bandwidth_code / 4 + 3;
2429 3 cpl_start_band = av_clip(cpl_start, 0, FFMIN(cpl_end_band-1, 15));
2430
2431 3 s->num_cpl_subbands = cpl_end_band - cpl_start_band;
2432
2433 3 s->num_cpl_bands = 1;
2434 3 *cpl_band_sizes = 12;
2435
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15 for (i = cpl_start_band + 1; i < cpl_end_band; i++) {
2436
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12 if (ff_eac3_default_cpl_band_struct[i]) {
2437 3 *cpl_band_sizes += 12;
2438 } else {
2439 9 s->num_cpl_bands++;
2440 9 cpl_band_sizes++;
2441 9 *cpl_band_sizes = 12;
2442 }
2443 }
2444
2445 3 s->start_freq[CPL_CH] = cpl_start_band * 12 + 37;
2446 3 s->cpl_end_freq = cpl_end_band * 12 + 37;
2447
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21 for (blk = 0; blk < s->num_blocks; blk++)
2448 18 s->blocks[blk].end_freq[CPL_CH] = s->cpl_end_freq;
2449 }
2450 10 }
2451
2452
2453 10 static av_cold int allocate_buffers(AC3EncodeContext *s)
2454 {
2455 int blk, ch;
2456 10 int channels = s->channels + 1; /* includes coupling channel */
2457 10 int channel_blocks = channels * s->num_blocks;
2458 10 int total_coefs = AC3_MAX_COEFS * channel_blocks;
2459
2460
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10 if (s->allocate_sample_buffers(s))
2461 return AVERROR(ENOMEM);
2462
2463
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10 if (!FF_ALLOC_TYPED_ARRAY(s->bap_buffer, total_coefs) ||
2464
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10 !FF_ALLOC_TYPED_ARRAY(s->bap1_buffer, total_coefs) ||
2465
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10 !FF_ALLOCZ_TYPED_ARRAY(s->mdct_coef_buffer, total_coefs) ||
2466
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10 !FF_ALLOC_TYPED_ARRAY(s->exp_buffer, total_coefs) ||
2467
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10 !FF_ALLOC_TYPED_ARRAY(s->grouped_exp_buffer, channel_blocks * 128) ||
2468
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10 !FF_ALLOC_TYPED_ARRAY(s->psd_buffer, total_coefs) ||
2469
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10 !FF_ALLOC_TYPED_ARRAY(s->band_psd_buffer, channel_blocks * 64) ||
2470
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10 !FF_ALLOC_TYPED_ARRAY(s->mask_buffer, channel_blocks * 64) ||
2471
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10 !FF_ALLOC_TYPED_ARRAY(s->qmant_buffer, total_coefs))
2472 return AVERROR(ENOMEM);
2473
2474
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10 if (s->cpl_enabled) {
2475
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3 if (!FF_ALLOC_TYPED_ARRAY(s->cpl_coord_exp_buffer, channel_blocks * 16) ||
2476
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3 !FF_ALLOC_TYPED_ARRAY(s->cpl_coord_mant_buffer, channel_blocks * 16))
2477 return AVERROR(ENOMEM);
2478 }
2479
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70 for (blk = 0; blk < s->num_blocks; blk++) {
2480 60 AC3Block *block = &s->blocks[blk];
2481
2482
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60 if (!FF_ALLOCZ_TYPED_ARRAY(block->mdct_coef, channels) ||
2483
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60 !FF_ALLOCZ_TYPED_ARRAY(block->exp, channels) ||
2484
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60 !FF_ALLOCZ_TYPED_ARRAY(block->grouped_exp, channels) ||
2485
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60 !FF_ALLOCZ_TYPED_ARRAY(block->psd, channels) ||
2486
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60 !FF_ALLOCZ_TYPED_ARRAY(block->band_psd, channels) ||
2487
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60 !FF_ALLOCZ_TYPED_ARRAY(block->mask, channels) ||
2488
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60 !FF_ALLOCZ_TYPED_ARRAY(block->qmant, channels))
2489 return AVERROR(ENOMEM);
2490
2491
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60 if (s->cpl_enabled) {
2492
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18 if (!FF_ALLOCZ_TYPED_ARRAY(block->cpl_coord_exp, channels) ||
2493
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18 !FF_ALLOCZ_TYPED_ARRAY(block->cpl_coord_mant, channels))
2494 return AVERROR(ENOMEM);
2495 }
2496
2497
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198 for (ch = 0; ch < channels; ch++) {
2498 /* arrangement: block, channel, coeff */
2499 138 block->grouped_exp[ch] = &s->grouped_exp_buffer[128 * (blk * channels + ch)];
2500 138 block->psd[ch] = &s->psd_buffer [AC3_MAX_COEFS * (blk * channels + ch)];
2501 138 block->band_psd[ch] = &s->band_psd_buffer [64 * (blk * channels + ch)];
2502 138 block->mask[ch] = &s->mask_buffer [64 * (blk * channels + ch)];
2503 138 block->qmant[ch] = &s->qmant_buffer [AC3_MAX_COEFS * (blk * channels + ch)];
2504
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138 if (s->cpl_enabled) {
2505 54 block->cpl_coord_exp[ch] = &s->cpl_coord_exp_buffer [16 * (blk * channels + ch)];
2506 54 block->cpl_coord_mant[ch] = &s->cpl_coord_mant_buffer[16 * (blk * channels + ch)];
2507 }
2508
2509 /* arrangement: channel, block, coeff */
2510 138 block->exp[ch] = &s->exp_buffer [AC3_MAX_COEFS * (s->num_blocks * ch + blk)];
2511 138 block->mdct_coef[ch] = &s->mdct_coef_buffer [AC3_MAX_COEFS * (s->num_blocks * ch + blk)];
2512 }
2513 }
2514
2515
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10 if (!s->fixed_point) {
2516
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2 if (!FF_ALLOCZ_TYPED_ARRAY(s->fixed_coef_buffer, total_coefs))
2517 return AVERROR(ENOMEM);
2518
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14 for (blk = 0; blk < s->num_blocks; blk++) {
2519 12 AC3Block *block = &s->blocks[blk];
2520
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12 if (!FF_ALLOCZ_TYPED_ARRAY(block->fixed_coef, channels))
2521 return AVERROR(ENOMEM);
2522
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48 for (ch = 0; ch < channels; ch++)
2523 36 block->fixed_coef[ch] = &s->fixed_coef_buffer[AC3_MAX_COEFS * (s->num_blocks * ch + blk)];
2524 }
2525 } else {
2526
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56 for (blk = 0; blk < s->num_blocks; blk++) {
2527 48 AC3Block *block = &s->blocks[blk];
2528
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48 if (!FF_ALLOCZ_TYPED_ARRAY(block->fixed_coef, channels))
2529 return AVERROR(ENOMEM);
2530
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150 for (ch = 0; ch < channels; ch++)
2531 102 block->fixed_coef[ch] = (int32_t *)block->mdct_coef[ch];
2532 }
2533 }
2534
2535 10 return 0;
2536 }
2537
2538
2539 10 av_cold int ff_ac3_encode_init(AVCodecContext *avctx)
2540 {
2541 static AVOnce init_static_once = AV_ONCE_INIT;
2542 10 AC3EncodeContext *s = avctx->priv_data;
2543 int ret, frame_size_58;
2544
2545 10 s->avctx = avctx;
2546
2547 10 s->eac3 = avctx->codec_id == AV_CODEC_ID_EAC3;
2548
2549 10 ret = validate_options(s);
2550
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10 if (ret)
2551 return ret;
2552
2553 10 avctx->frame_size = AC3_BLOCK_SIZE * s->num_blocks;
2554 10 avctx->initial_padding = AC3_BLOCK_SIZE;
2555
2556 10 s->bitstream_mode = avctx->audio_service_type;
2557
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10 if (s->bitstream_mode == AV_AUDIO_SERVICE_TYPE_KARAOKE)
2558 s->bitstream_mode = 0x7;
2559
2560 10 s->bits_written = 0;
2561 10 s->samples_written = 0;
2562
2563 /* calculate crc_inv for both possible frame sizes */
2564 10 frame_size_58 = (( s->frame_size >> 2) + ( s->frame_size >> 4)) << 1;
2565 10 s->crc_inv[0] = pow_poly((CRC16_POLY >> 1), (8 * frame_size_58) - 16, CRC16_POLY);
2566
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10 if (s->bit_alloc.sr_code == 1) {
2567 10 frame_size_58 = (((s->frame_size+2) >> 2) + ((s->frame_size+2) >> 4)) << 1;
2568 10 s->crc_inv[1] = pow_poly((CRC16_POLY >> 1), (8 * frame_size_58) - 16, CRC16_POLY);
2569 }
2570
2571
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10 if (CONFIG_EAC3_ENCODER && s->eac3) {
2572 static AVOnce init_static_once_eac3 = AV_ONCE_INIT;
2573 1 ff_thread_once(&init_static_once_eac3, ff_eac3_exponent_init);
2574 1 s->output_frame_header = ff_eac3_output_frame_header;
2575 } else
2576 9 s->output_frame_header = ac3_output_frame_header;
2577
2578 10 set_bandwidth(s);
2579
2580 10 bit_alloc_init(s);
2581
2582 10 ret = s->mdct_init(s);
2583
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10 if (ret)
2584 return ret;
2585
2586 10 ret = allocate_buffers(s);
2587
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10 if (ret)
2588 return ret;
2589
2590 10 ff_audiodsp_init(&s->adsp);
2591 10 ff_me_cmp_init(&s->mecc, avctx);
2592 10 ff_ac3dsp_init(&s->ac3dsp);
2593
2594 10 dprint_options(s);
2595
2596 10 ff_thread_once(&init_static_once, exponent_init);
2597
2598 10 return 0;
2599 }
2600