FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/ac3enc.c
Date: 2025-10-24 21:16:34
Exec Total Coverage
Lines: 993 1141 87.0%
Functions: 43 43 100.0%
Branches: 626 811 77.2%
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/channel_layout.h"
34 #include "libavutil/crc.h"
35 #include "libavutil/internal.h"
36 #include "libavutil/mem.h"
37 #include "libavutil/mem_internal.h"
38 #include "libavutil/opt.h"
39 #include "libavutil/thread.h"
40 #include "avcodec.h"
41 #include "codec_internal.h"
42 #include "config_components.h"
43 #include "encode.h"
44 #include "me_cmp.h"
45 #include "put_bits.h"
46 #include "audiodsp.h"
47 #include "ac3dsp.h"
48 #include "ac3.h"
49 #include "ac3defs.h"
50 #include "ac3tab.h"
51 #include "ac3enc.h"
52 #include "eac3enc.h"
53
54 #define SAMPLETYPE_SIZE(ctx) (sizeof(float) == sizeof(int32_t) ? sizeof(float) : \
55 (ctx)->fixed_point ? sizeof(int32_t) : sizeof(float))
56
57 typedef struct AC3Mant {
58 int16_t *qmant1_ptr, *qmant2_ptr, *qmant4_ptr; ///< mantissa pointers for bap=1,2,4
59 int mant1_cnt, mant2_cnt, mant4_cnt; ///< mantissa counts for bap=1,2,4
60 } AC3Mant;
61
62 #define CMIXLEV_NUM_OPTIONS 3
63 static const float cmixlev_options[CMIXLEV_NUM_OPTIONS] = {
64 LEVEL_MINUS_3DB, LEVEL_MINUS_4POINT5DB, LEVEL_MINUS_6DB
65 };
66
67 #define SURMIXLEV_NUM_OPTIONS 3
68 static const float surmixlev_options[SURMIXLEV_NUM_OPTIONS] = {
69 LEVEL_MINUS_3DB, LEVEL_MINUS_6DB, LEVEL_ZERO
70 };
71
72 #define EXTMIXLEV_NUM_OPTIONS 8
73 #define extmixlev_options ff_ac3_gain_levels
74
75 /* The first two options apply only to the AC-3 encoders;
76 * the rest is also valid for EAC-3. When modifying it,
77 * it might be necessary to adapt said offset in eac3enc.c. */
78 #define OFFSET(param) offsetof(AC3EncodeContext, options.param)
79 #define AC3ENC_PARAM (AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM)
80 const AVOption ff_ac3_enc_options[] = {
81 /* AC-3 downmix levels */
82 {"center_mixlev", "Center Mix Level", OFFSET(center_mix_level), AV_OPT_TYPE_FLOAT, {.dbl = LEVEL_MINUS_4POINT5DB }, 0.0, 1.0, AC3ENC_PARAM},
83 {"surround_mixlev", "Surround Mix Level", OFFSET(surround_mix_level), AV_OPT_TYPE_FLOAT, {.dbl = LEVEL_MINUS_6DB }, 0.0, 1.0, AC3ENC_PARAM},
84 /* audio production information */
85 {"mixing_level", "Mixing Level", OFFSET(mixing_level), AV_OPT_TYPE_INT, {.i64 = AC3ENC_OPT_NONE }, AC3ENC_OPT_NONE, 111, AC3ENC_PARAM},
86 {"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"},
87 {"notindicated", "Not Indicated (default)", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_NOT_INDICATED }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "room_type"},
88 {"large", "Large Room", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_LARGE_ROOM }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "room_type"},
89 {"small", "Small Room", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_SMALL_ROOM }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "room_type"},
90 /* Metadata Options */
91 {"per_frame_metadata", "Allow Changing Metadata Per-Frame", OFFSET(allow_per_frame_metadata), AV_OPT_TYPE_BOOL, {.i64 = 0 }, 0, 1, AC3ENC_PARAM},
92 {"copyright", "Copyright Bit", OFFSET(copyright), AV_OPT_TYPE_INT, {.i64 = AC3ENC_OPT_NONE }, AC3ENC_OPT_NONE, 1, AC3ENC_PARAM},
93 {"dialnorm", "Dialogue Level (dB)", OFFSET(dialogue_level), AV_OPT_TYPE_INT, {.i64 = -31 }, -31, -1, AC3ENC_PARAM},
94 {"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"},
95 {"notindicated", "Not Indicated (default)", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_NOT_INDICATED }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "dsur_mode"},
96 {"on", "Dolby Surround Encoded", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_MODE_ON }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "dsur_mode"},
97 {"off", "Not Dolby Surround Encoded", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_MODE_OFF }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "dsur_mode"},
98 {"original", "Original Bit Stream", OFFSET(original), AV_OPT_TYPE_INT, {.i64 = AC3ENC_OPT_NONE }, AC3ENC_OPT_NONE, 1, AC3ENC_PARAM},
99 /* extended bitstream information */
100 {"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"},
101 {"notindicated", "Not Indicated (default)", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_NOT_INDICATED }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "dmix_mode"},
102 {"ltrt", "Lt/Rt Downmix Preferred", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_DOWNMIX_LTRT }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "dmix_mode"},
103 {"loro", "Lo/Ro Downmix Preferred", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_DOWNMIX_LORO }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "dmix_mode"},
104 {"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"},
105 {"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},
106 {"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},
107 {"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},
108 {"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},
109 {"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"},
110 {"notindicated", "Not Indicated (default)", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_NOT_INDICATED }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "dsurex_mode"},
111 {"on", "Dolby Surround EX Encoded", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_MODE_ON }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "dsurex_mode"},
112 {"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"},
113 {"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"},
114 {"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"},
115 {"notindicated", "Not Indicated (default)", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_NOT_INDICATED }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "dheadphone_mode"},
116 {"on", "Dolby Headphone Encoded", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_MODE_ON }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "dheadphone_mode"},
117 {"off", "Not Dolby Headphone Encoded", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_MODE_OFF }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "dheadphone_mode"},
118 {"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"},
119 {"standard", "Standard (default)", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_ADCONV_STANDARD }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "ad_conv_type"},
120 {"hdcd", "HDCD", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_ADCONV_HDCD }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "ad_conv_type"},
121 /* Other Encoding Options */
122 {"stereo_rematrixing", "Stereo Rematrixing", OFFSET(stereo_rematrixing), AV_OPT_TYPE_BOOL, {.i64 = 1 }, 0, 1, AC3ENC_PARAM},
123 {"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"},
124 {"auto", "Selected by the Encoder", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_AUTO }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "channel_coupling"},
125 {"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"},
126 {"auto", "Selected by the Encoder", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_AUTO }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "cpl_start_band"},
127 {NULL}
128 };
129
130 const AVClass ff_ac3enc_class = {
131 .class_name = "AC-3 Encoder",
132 .item_name = av_default_item_name,
133 .option = ff_ac3_enc_options,
134 .version = LIBAVUTIL_VERSION_INT,
135 };
136
137 const FFCodecDefault ff_ac3_enc_defaults[] = {
138 { "b", "0" },
139 { NULL }
140 };
141
142 /**
143 * LUT for number of exponent groups.
144 * exponent_group_tab[coupling][exponent strategy-1][number of coefficients]
145 */
146 static uint8_t exponent_group_tab[2][3][256];
147
148
149 /**
150 * List of supported channel layouts.
151 */
152 const AVChannelLayout ff_ac3_ch_layouts[19] = {
153 AV_CHANNEL_LAYOUT_MONO,
154 AV_CHANNEL_LAYOUT_STEREO,
155 AV_CHANNEL_LAYOUT_2_1,
156 AV_CHANNEL_LAYOUT_SURROUND,
157 AV_CHANNEL_LAYOUT_2_2,
158 AV_CHANNEL_LAYOUT_QUAD,
159 AV_CHANNEL_LAYOUT_4POINT0,
160 AV_CHANNEL_LAYOUT_5POINT0,
161 AV_CHANNEL_LAYOUT_5POINT0_BACK,
162 {
163 .nb_channels = 2,
164 .order = AV_CHANNEL_ORDER_NATIVE,
165 .u.mask = AV_CH_LAYOUT_MONO | AV_CH_LOW_FREQUENCY,
166 },
167 {
168 .nb_channels = 3,
169 .order = AV_CHANNEL_ORDER_NATIVE,
170 .u.mask = AV_CH_LAYOUT_STEREO | AV_CH_LOW_FREQUENCY,
171 },
172 {
173 .nb_channels = 4,
174 .order = AV_CHANNEL_ORDER_NATIVE,
175 .u.mask = AV_CH_LAYOUT_2_1 | AV_CH_LOW_FREQUENCY,
176 },
177 {
178 .nb_channels = 4,
179 .order = AV_CHANNEL_ORDER_NATIVE,
180 .u.mask = AV_CH_LAYOUT_SURROUND | AV_CH_LOW_FREQUENCY,
181 },
182 {
183 .nb_channels = 5,
184 .order = AV_CHANNEL_ORDER_NATIVE,
185 .u.mask = AV_CH_LAYOUT_4POINT0 | AV_CH_LOW_FREQUENCY,
186 },
187 AV_CHANNEL_LAYOUT_5POINT1,
188 AV_CHANNEL_LAYOUT_5POINT1_BACK,
189 { 0 },
190 };
191
192 /**
193 * Table to remap channels from SMPTE order to AC-3 order.
194 * [channel_mode][lfe][ch]
195 */
196 static const uint8_t ac3_enc_channel_map[8][2][6] = {
197 COMMON_CHANNEL_MAP
198 { { 0, 1, 2, 3, }, { 0, 1, 3, 4, 2, } },
199 { { 0, 2, 1, 3, 4, }, { 0, 2, 1, 4, 5, 3 } },
200 };
201
202 /**
203 * LUT to select the bandwidth code based on the bit rate, sample rate, and
204 * number of full-bandwidth channels.
205 * bandwidth_tab[fbw_channels-1][sample rate code][bit rate code]
206 */
207 static const uint8_t ac3_bandwidth_tab[5][3][19] = {
208 // 32 40 48 56 64 80 96 112 128 160 192 224 256 320 384 448 512 576 640
209
210 { { 0, 0, 0, 12, 16, 32, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48 },
211 { 0, 0, 0, 16, 20, 36, 56, 56, 56, 56, 56, 56, 56, 56, 56, 56, 56, 56, 56 },
212 { 0, 0, 0, 32, 40, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60 } },
213
214 { { 0, 0, 0, 0, 0, 0, 0, 20, 24, 32, 48, 48, 48, 48, 48, 48, 48, 48, 48 },
215 { 0, 0, 0, 0, 0, 0, 4, 24, 28, 36, 56, 56, 56, 56, 56, 56, 56, 56, 56 },
216 { 0, 0, 0, 0, 0, 0, 20, 44, 52, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60 } },
217
218 { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 16, 24, 32, 40, 48, 48, 48, 48, 48, 48 },
219 { 0, 0, 0, 0, 0, 0, 0, 0, 4, 20, 28, 36, 44, 56, 56, 56, 56, 56, 56 },
220 { 0, 0, 0, 0, 0, 0, 0, 0, 20, 40, 48, 60, 60, 60, 60, 60, 60, 60, 60 } },
221
222 { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 12, 24, 32, 48, 48, 48, 48, 48, 48 },
223 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 16, 28, 36, 56, 56, 56, 56, 56, 56 },
224 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 32, 48, 60, 60, 60, 60, 60, 60, 60 } },
225
226 { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 8, 20, 32, 40, 48, 48, 48, 48 },
227 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 12, 24, 36, 44, 56, 56, 56, 56 },
228 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 28, 44, 60, 60, 60, 60, 60, 60 } }
229 };
230
231
232 /**
233 * LUT to select the coupling start band based on the bit rate, sample rate, and
234 * number of full-bandwidth channels. -1 = coupling off
235 * ac3_coupling_start_tab[channel_mode-2][sample rate code][bit rate code]
236 *
237 * TODO: more testing for optimal parameters.
238 * multi-channel tests at 44.1kHz and 32kHz.
239 */
240 static const int8_t ac3_coupling_start_tab[6][3][19] = {
241 // 32 40 48 56 64 80 96 112 128 160 192 224 256 320 384 448 512 576 640
242
243 // 2/0
244 { { 0, 0, 0, 0, 0, 0, 0, 1, 1, 7, 8, 11, 12, -1, -1, -1, -1, -1, -1 },
245 { 0, 0, 0, 0, 0, 0, 1, 3, 5, 7, 10, 12, 13, -1, -1, -1, -1, -1, -1 },
246 { 0, 0, 0, 0, 1, 2, 2, 9, 13, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1 } },
247
248 // 3/0
249 { { 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 6, 9, 11, 12, 13, -1, -1, -1, -1 },
250 { 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 6, 9, 11, 12, 13, -1, -1, -1, -1 },
251 { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 } },
252
253 // 2/1 - untested
254 { { 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 6, 9, 11, 12, 13, -1, -1, -1, -1 },
255 { 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 6, 9, 11, 12, 13, -1, -1, -1, -1 },
256 { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 } },
257
258 // 3/1
259 { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 2, 10, 11, 11, 12, 12, 14, -1 },
260 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 2, 10, 11, 11, 12, 12, 14, -1 },
261 { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 } },
262
263 // 2/2 - untested
264 { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 2, 10, 11, 11, 12, 12, 14, -1 },
265 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 2, 10, 11, 11, 12, 12, 14, -1 },
266 { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 } },
267
268 // 3/2
269 { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 6, 8, 11, 12, 12, -1, -1 },
270 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 6, 8, 11, 12, 12, -1, -1 },
271 { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 } },
272 };
273
274
275 #define FLT_OPTION_THRESHOLD 0.01
276
277 2 static int validate_float_option(float v, const float *v_list, int v_list_size)
278 {
279 int i;
280
281
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282
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283
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 4 v > (v_list[i] - FLT_OPTION_THRESHOLD))
284 2 break;
285 }
286
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 2 if (i == v_list_size)
287 ✗ return AVERROR(EINVAL);
288
289 2 return i;
290 }
291
292
293 2 static void validate_mix_level(void *log_ctx, const char *opt_name,
294 float *opt_param, const float *list,
295 int list_size, int default_value, int min_value,
296 int *ctx_param)
297 {
298 2 int mixlev = validate_float_option(*opt_param, list, list_size);
299
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 2 if (mixlev < min_value) {
300 ✗ mixlev = default_value;
301 ✗ if (*opt_param >= 0.0) {
302 ✗ av_log(log_ctx, AV_LOG_WARNING, "requested %s is not valid. using "
303 ✗ "default value: %0.3f\n", opt_name, list[mixlev]);
304 }
305 }
306 2 *opt_param = list[mixlev];
307 2 *ctx_param = mixlev;
308 2 }
309
310
311 /**
312 * Validate metadata options as set by AVOption system.
313 * These values can optionally be changed per-frame.
314 *
315 * @param s AC-3 encoder private context
316 */
317 11 static int ac3_validate_metadata(AC3EncodeContext *s)
318 {
319 11 AVCodecContext *avctx = s->avctx;
320 11 AC3EncOptions *opt = &s->options;
321
322 11 opt->audio_production_info = 0;
323 11 opt->extended_bsi_1 = 0;
324 11 opt->extended_bsi_2 = 0;
325 11 opt->eac3_mixing_metadata = 0;
326 11 opt->eac3_info_metadata = 0;
327
328 /* determine mixing metadata / xbsi1 use */
329
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 11 if (s->channel_mode > AC3_CHMODE_STEREO && opt->preferred_stereo_downmix != AC3ENC_OPT_NONE) {
330 ✗ opt->extended_bsi_1 = 1;
331 ✗ opt->eac3_mixing_metadata = 1;
332 }
333
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 11 if (s->has_center &&
334
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 1 (opt->ltrt_center_mix_level >= 0 || opt->loro_center_mix_level >= 0)) {
335 ✗ opt->extended_bsi_1 = 1;
336 ✗ opt->eac3_mixing_metadata = 1;
337 }
338
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 11 if (s->has_surround &&
339
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 1 (opt->ltrt_surround_mix_level >= 0 || opt->loro_surround_mix_level >= 0)) {
340 ✗ opt->extended_bsi_1 = 1;
341 ✗ opt->eac3_mixing_metadata = 1;
342 }
343
344
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 11 if (s->eac3) {
345 /* determine info metadata use */
346
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 1 if (avctx->audio_service_type != AV_AUDIO_SERVICE_TYPE_MAIN)
347 ✗ opt->eac3_info_metadata = 1;
348
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 1 if (opt->copyright != AC3ENC_OPT_NONE || opt->original != AC3ENC_OPT_NONE)
349 ✗ opt->eac3_info_metadata = 1;
350
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 1 if (s->channel_mode == AC3_CHMODE_STEREO &&
351
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 1 (opt->dolby_headphone_mode != AC3ENC_OPT_NONE || opt->dolby_surround_mode != AC3ENC_OPT_NONE))
352 ✗ opt->eac3_info_metadata = 1;
353
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 1 if (s->channel_mode >= AC3_CHMODE_2F2R && opt->dolby_surround_ex_mode != AC3ENC_OPT_NONE)
354 ✗ opt->eac3_info_metadata = 1;
355
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 1 if (opt->mixing_level != AC3ENC_OPT_NONE || opt->room_type != AC3ENC_OPT_NONE ||
356
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 1 opt->ad_converter_type != AC3ENC_OPT_NONE) {
357 ✗ opt->audio_production_info = 1;
358 ✗ opt->eac3_info_metadata = 1;
359 }
360 } else {
361 /* determine audio production info use */
362
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 10 if (opt->mixing_level != AC3ENC_OPT_NONE || opt->room_type != AC3ENC_OPT_NONE)
363 ✗ opt->audio_production_info = 1;
364
365 /* determine xbsi2 use */
366
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 10 if (s->channel_mode >= AC3_CHMODE_2F2R && opt->dolby_surround_ex_mode != AC3ENC_OPT_NONE)
367 ✗ opt->extended_bsi_2 = 1;
368
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 10 if (s->channel_mode == AC3_CHMODE_STEREO && opt->dolby_headphone_mode != AC3ENC_OPT_NONE)
369 ✗ opt->extended_bsi_2 = 1;
370
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 10 if (opt->ad_converter_type != AC3ENC_OPT_NONE)
371 ✗ opt->extended_bsi_2 = 1;
372 }
373
374 /* validate AC-3 mixing levels */
375
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 11 if (!s->eac3) {
376
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 10 if (s->has_center) {
377 1 validate_mix_level(avctx, "center_mix_level", &opt->center_mix_level,
378 cmixlev_options, CMIXLEV_NUM_OPTIONS, 1, 0,
379 &s->center_mix_level);
380 }
381
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 10 if (s->has_surround) {
382 1 validate_mix_level(avctx, "surround_mix_level", &opt->surround_mix_level,
383 surmixlev_options, SURMIXLEV_NUM_OPTIONS, 1, 0,
384 &s->surround_mix_level);
385 }
386 }
387
388 /* validate extended bsi 1 / mixing metadata */
389
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 11 if (opt->extended_bsi_1 || opt->eac3_mixing_metadata) {
390 /* default preferred stereo downmix */
391 ✗ if (opt->preferred_stereo_downmix == AC3ENC_OPT_NONE)
392 ✗ opt->preferred_stereo_downmix = AC3ENC_OPT_NOT_INDICATED;
393 ✗ if (!s->eac3 || s->has_center) {
394 /* validate Lt/Rt center mix level */
395 ✗ validate_mix_level(avctx, "ltrt_center_mix_level",
396 &opt->ltrt_center_mix_level, extmixlev_options,
397 EXTMIXLEV_NUM_OPTIONS, 5, 0,
398 &s->ltrt_center_mix_level);
399 /* validate Lo/Ro center mix level */
400 ✗ validate_mix_level(avctx, "loro_center_mix_level",
401 &opt->loro_center_mix_level, extmixlev_options,
402 EXTMIXLEV_NUM_OPTIONS, 5, 0,
403 &s->loro_center_mix_level);
404 }
405 ✗ if (!s->eac3 || s->has_surround) {
406 /* validate Lt/Rt surround mix level */
407 ✗ validate_mix_level(avctx, "ltrt_surround_mix_level",
408 &opt->ltrt_surround_mix_level, extmixlev_options,
409 EXTMIXLEV_NUM_OPTIONS, 6, 3,
410 &s->ltrt_surround_mix_level);
411 /* validate Lo/Ro surround mix level */
412 ✗ validate_mix_level(avctx, "loro_surround_mix_level",
413 &opt->loro_surround_mix_level, extmixlev_options,
414 EXTMIXLEV_NUM_OPTIONS, 6, 3,
415 &s->loro_surround_mix_level);
416 }
417 }
418
419 /* validate audio service type / channels combination */
420
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 11 if ((avctx->audio_service_type == AV_AUDIO_SERVICE_TYPE_KARAOKE &&
421 ✗ avctx->ch_layout.nb_channels == 1) ||
422
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423
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 11 avctx->audio_service_type == AV_AUDIO_SERVICE_TYPE_EMERGENCY ||
424
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 11 avctx->audio_service_type == AV_AUDIO_SERVICE_TYPE_VOICE_OVER)
425 ✗ && avctx->ch_layout.nb_channels > 1)) {
426 ✗ av_log(avctx, AV_LOG_ERROR, "invalid audio service type for the "
427 "specified number of channels\n");
428 ✗ return AVERROR(EINVAL);
429 }
430
431 /* validate extended bsi 2 / info metadata */
432
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 11 if (opt->extended_bsi_2 || opt->eac3_info_metadata) {
433 /* default dolby headphone mode */
434 ✗ if (opt->dolby_headphone_mode == AC3ENC_OPT_NONE)
435 ✗ opt->dolby_headphone_mode = AC3ENC_OPT_NOT_INDICATED;
436 /* default dolby surround ex mode */
437 ✗ if (opt->dolby_surround_ex_mode == AC3ENC_OPT_NONE)
438 ✗ opt->dolby_surround_ex_mode = AC3ENC_OPT_NOT_INDICATED;
439 /* default A/D converter type */
440 ✗ if (opt->ad_converter_type == AC3ENC_OPT_NONE)
441 ✗ opt->ad_converter_type = AC3ENC_OPT_ADCONV_STANDARD;
442 }
443
444 /* copyright & original defaults */
445
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 11 if (!s->eac3 || opt->eac3_info_metadata) {
446 /* default copyright */
447
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 10 if (opt->copyright == AC3ENC_OPT_NONE)
448 10 opt->copyright = AC3ENC_OPT_OFF;
449 /* default original */
450
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 10 if (opt->original == AC3ENC_OPT_NONE)
451 10 opt->original = AC3ENC_OPT_ON;
452 }
453
454 /* dolby surround mode default */
455
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 11 if (!s->eac3 || opt->eac3_info_metadata) {
456
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 10 if (opt->dolby_surround_mode == AC3ENC_OPT_NONE)
457 10 opt->dolby_surround_mode = AC3ENC_OPT_NOT_INDICATED;
458 }
459
460 /* validate audio production info */
461
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 11 if (opt->audio_production_info) {
462 ✗ if (opt->mixing_level == AC3ENC_OPT_NONE) {
463 ✗ av_log(avctx, AV_LOG_ERROR, "mixing_level must be set if "
464 "room_type is set\n");
465 ✗ return AVERROR(EINVAL);
466 }
467 ✗ if (opt->mixing_level < 80) {
468 ✗ av_log(avctx, AV_LOG_ERROR, "invalid mixing level. must be between "
469 "80dB and 111dB\n");
470 ✗ return AVERROR(EINVAL);
471 }
472 /* default room type */
473 ✗ if (opt->room_type == AC3ENC_OPT_NONE)
474 ✗ opt->room_type = AC3ENC_OPT_NOT_INDICATED;
475 }
476
477 /* set bitstream id for alternate bitstream syntax */
478
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 11 if (!s->eac3 && (opt->extended_bsi_1 || opt->extended_bsi_2))
479 ✗ s->bitstream_id = 6;
480
481 11 return 0;
482 }
483
484 /**
485 * Adjust the frame size to make the average bit rate match the target bit rate.
486 * This is only needed for 11025, 22050, and 44100 sample rates or any E-AC-3.
487 *
488 * @param s AC-3 encoder private context
489 */
490 1231 static void ac3_adjust_frame_size(AC3EncodeContext *s)
491 {
492
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 1267 while (s->bits_written >= s->bit_rate && s->samples_written >= s->sample_rate) {
493 36 s->bits_written -= s->bit_rate;
494 36 s->samples_written -= s->sample_rate;
495 }
496 2462 s->frame_size = s->frame_size_min +
497
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 1231 2 * (s->bits_written * s->sample_rate < s->samples_written * s->bit_rate);
498 1231 s->bits_written += s->frame_size * 8;
499 1231 s->samples_written += AC3_BLOCK_SIZE * s->num_blocks;
500 1231 }
501
502 /**
503 * Set the initial coupling strategy parameters prior to coupling analysis.
504 *
505 * @param s AC-3 encoder private context
506 */
507 1231 void ff_ac3_compute_coupling_strategy(AC3EncodeContext *s)
508 {
509 int blk, ch;
510 int got_cpl_snr;
511 int num_cpl_blocks;
512
513 /* set coupling use flags for each block/channel */
514 /* TODO: turn coupling on/off and adjust start band based on bit usage */
515
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 8617 for (blk = 0; blk < s->num_blocks; blk++) {
516 7386 AC3Block *block = &s->blocks[blk];
517
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 19278 for (ch = 1; ch <= s->fbw_channels; ch++)
518 11892 block->channel_in_cpl[ch] = s->cpl_on;
519 }
520
521 /* enable coupling for each block if at least 2 channels have coupling
522 enabled for that block */
523 1231 got_cpl_snr = 0;
524 1231 num_cpl_blocks = 0;
525
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 8617 for (blk = 0; blk < s->num_blocks; blk++) {
526 7386 AC3Block *block = &s->blocks[blk];
527 7386 block->num_cpl_channels = 0;
528
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 19278 for (ch = 1; ch <= s->fbw_channels; ch++)
529 11892 block->num_cpl_channels += block->channel_in_cpl[ch];
530 7386 block->cpl_in_use = block->num_cpl_channels > 1;
531 7386 num_cpl_blocks += block->cpl_in_use;
532
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 7386 if (!block->cpl_in_use) {
533 3024 block->num_cpl_channels = 0;
534
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 6048 for (ch = 1; ch <= s->fbw_channels; ch++)
535 3024 block->channel_in_cpl[ch] = 0;
536 }
537
538 7386 block->new_cpl_strategy = !blk;
539
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 7386 if (blk) {
540
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 16065 for (ch = 1; ch <= s->fbw_channels; ch++) {
541
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 9910 if (block->channel_in_cpl[ch] != s->blocks[blk-1].channel_in_cpl[ch]) {
542 ✗ block->new_cpl_strategy = 1;
543 ✗ break;
544 }
545 }
546 }
547 7386 block->new_cpl_leak = block->new_cpl_strategy;
548
549
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 7386 if (!blk || (block->cpl_in_use && !got_cpl_snr)) {
550 1231 block->new_snr_offsets = 1;
551
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 1231 if (block->cpl_in_use)
552 727 got_cpl_snr = 1;
553 } else {
554 6155 block->new_snr_offsets = 0;
555 }
556 }
557
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 1231 if (!num_cpl_blocks)
558 504 s->cpl_on = 0;
559
560 /* set bandwidth for each channel */
561
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 8617 for (blk = 0; blk < s->num_blocks; blk++) {
562 7386 AC3Block *block = &s->blocks[blk];
563
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 19278 for (ch = 1; ch <= s->fbw_channels; ch++) {
564
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 11892 if (block->channel_in_cpl[ch])
565 8868 block->end_freq[ch] = s->start_freq[CPL_CH];
566 else
567 3024 block->end_freq[ch] = s->bandwidth_code * 3 + 73;
568 }
569 }
570 1231 }
571
572
573 /**
574 * Apply stereo rematrixing to coefficients based on rematrixing flags.
575 *
576 * @param s AC-3 encoder private context
577 */
578 1231 static void ac3_apply_rematrixing(AC3EncodeContext *s)
579 {
580 int nb_coefs;
581 int blk, bnd, i;
582 int start, end;
583 1231 uint8_t *flags = NULL;
584
585
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 1231 if (!s->rematrixing_enabled)
586 512 return;
587
588
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 5033 for (blk = 0; blk < s->num_blocks; blk++) {
589 4314 AC3Block *block = &s->blocks[blk];
590
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 4314 if (block->new_rematrixing_strategy)
591 2197 flags = block->rematrixing_flags;
592 4314 nb_coefs = FFMIN(block->end_freq[1], block->end_freq[2]);
593
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 21570 for (bnd = 0; bnd < block->num_rematrixing_bands; bnd++) {
594
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 17256 if (flags[bnd]) {
595 9547 start = ff_ac3_rematrix_band_tab[bnd];
596 9547 end = FFMIN(nb_coefs, ff_ac3_rematrix_band_tab[bnd+1]);
597
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 225283 for (i = start; i < end; i++) {
598 215736 int32_t lt = block->fixed_coef[1][i];
599 215736 int32_t rt = block->fixed_coef[2][i];
600 215736 block->fixed_coef[1][i] = (lt + rt) >> 1;
601 215736 block->fixed_coef[2][i] = (lt - rt) >> 1;
602 }
603 }
604 }
605 }
606 }
607
608
609 /*
610 * Initialize exponent tables.
611 */
612 11 static av_cold void exponent_init(void)
613 {
614 int expstr, i, grpsize;
615
616
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 44 for (expstr = EXP_D15-1; expstr <= EXP_D45-1; expstr++) {
617 33 grpsize = 3 << expstr;
618
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 8085 for (i = 12; i < 256; i++) {
619 8052 exponent_group_tab[0][expstr][i] = (i + grpsize - 4) / grpsize;
620 8052 exponent_group_tab[1][expstr][i] = (i ) / grpsize;
621 }
622 }
623 /* LFE */
624 11 exponent_group_tab[0][0][7] = 2;
625 11 }
626
627
628 /*
629 * Extract exponents from the MDCT coefficients.
630 */
631 1231 static void extract_exponents(AC3EncodeContext *s)
632 {
633 1231 int ch = !s->cpl_on;
634 1231 int chan_size = AC3_MAX_COEFS * s->num_blocks * (s->channels - ch + 1);
635 1231 AC3Block *block = &s->blocks[0];
636
637 1231 s->ac3dsp.extract_exponents(block->exp[ch], block->fixed_coef[ch], chan_size);
638 1231 }
639
640
641 /**
642 * Exponent Difference Threshold.
643 * New exponents are sent if their SAD exceed this number.
644 */
645 #define EXP_DIFF_THRESHOLD 500
646
647 /**
648 * Table used to select exponent strategy based on exponent reuse block interval.
649 */
650 static const uint8_t exp_strategy_reuse_tab[4][6] = {
651 { EXP_D15, EXP_D15, EXP_D15, EXP_D15, EXP_D15, EXP_D15 },
652 { EXP_D15, EXP_D15, EXP_D15, EXP_D15, EXP_D15, EXP_D15 },
653 { EXP_D25, EXP_D25, EXP_D15, EXP_D15, EXP_D15, EXP_D15 },
654 { EXP_D45, EXP_D25, EXP_D25, EXP_D15, EXP_D15, EXP_D15 }
655 };
656
657 /*
658 * Calculate exponent strategies for all channels.
659 * Array arrangement is reversed to simplify the per-channel calculation.
660 */
661 1231 static void compute_exp_strategy(AC3EncodeContext *s)
662 {
663 int ch, blk, blk1;
664
665
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 3940 for (ch = !s->cpl_on; ch <= s->fbw_channels; ch++) {
666 2709 uint8_t *exp_strategy = s->exp_strategy[ch];
667 2709 uint8_t *exp = s->blocks[0].exp[ch];
668 int exp_diff;
669
670 /* estimate if the exponent variation & decide if they should be
671 reused in the next frame */
672 2709 exp_strategy[0] = EXP_NEW;
673 2709 exp += AC3_MAX_COEFS;
674
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 16254 for (blk = 1; blk < s->num_blocks; blk++, exp += AC3_MAX_COEFS) {
675
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 13545 if (ch == CPL_CH) {
676
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 3635 if (!s->blocks[blk-1].cpl_in_use) {
677 ✗ exp_strategy[blk] = EXP_NEW;
678 ✗ continue;
679
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 3635 } else if (!s->blocks[blk].cpl_in_use) {
680 ✗ exp_strategy[blk] = EXP_REUSE;
681 ✗ continue;
682 }
683
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 9910 } else if (s->blocks[blk].channel_in_cpl[ch] != s->blocks[blk-1].channel_in_cpl[ch]) {
684 ✗ exp_strategy[blk] = EXP_NEW;
685 ✗ continue;
686 }
687 13545 exp_diff = s->mecc.sad[0](NULL, exp, exp - AC3_MAX_COEFS, 16, 16);
688 13545 exp_strategy[blk] = EXP_REUSE;
689
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 13545 if (ch == CPL_CH && exp_diff > (EXP_DIFF_THRESHOLD * (s->blocks[blk].end_freq[ch] - s->start_freq[ch]) / AC3_MAX_COEFS))
690 723 exp_strategy[blk] = EXP_NEW;
691
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 12822 else if (ch > CPL_CH && exp_diff > EXP_DIFF_THRESHOLD)
692 270 exp_strategy[blk] = EXP_NEW;
693 }
694
695 /* now select the encoding strategy type : if exponents are often
696 recoded, we use a coarse encoding */
697 2709 blk = 0;
698
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 6411 while (blk < s->num_blocks) {
699 3702 blk1 = blk + 1;
700
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 16254 while (blk1 < s->num_blocks && exp_strategy[blk1] == EXP_REUSE)
701 12552 blk1++;
702 3702 exp_strategy[blk] = exp_strategy_reuse_tab[s->num_blks_code][blk1-blk-1];
703 3702 blk = blk1;
704 }
705 }
706
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 1231 if (s->lfe_on) {
707 8 ch = s->lfe_channel;
708 8 s->exp_strategy[ch][0] = EXP_D15;
709
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 48 for (blk = 1; blk < s->num_blocks; blk++)
710 40 s->exp_strategy[ch][blk] = EXP_REUSE;
711 }
712
713 /* for E-AC-3, determine frame exponent strategy */
714
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 1231 if (CONFIG_EAC3_ENCODER && s->eac3)
715 273 ff_eac3_get_frame_exp_strategy(s);
716 1231 }
717
718
719 /**
720 * Update the exponents so that they are the ones the decoder will decode.
721 *
722 * @param[in,out] exp array of exponents for 1 block in 1 channel
723 * @param nb_exps number of exponents in active bandwidth
724 * @param exp_strategy exponent strategy for the block
725 * @param cpl indicates if the block is in the coupling channel
726 */
727 3710 static void encode_exponents_blk_ch(uint8_t *exp, int nb_exps, int exp_strategy,
728 int cpl)
729 {
730 int nb_groups, i, k;
731
732 3710 nb_groups = exponent_group_tab[cpl][exp_strategy-1][nb_exps] * 3;
733
734 /* for each group, compute the minimum exponent */
735
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 3710 switch(exp_strategy) {
736 547 case EXP_D25:
737
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 26353 for (i = 1, k = 1-cpl; i <= nb_groups; i++) {
738 25806 uint8_t exp_min = exp[k];
739
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 25806 if (exp[k+1] < exp_min)
740 8244 exp_min = exp[k+1];
741 25806 exp[i-cpl] = exp_min;
742 25806 k += 2;
743 }
744 547 break;
745 697 case EXP_D45:
746
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 16990 for (i = 1, k = 1-cpl; i <= nb_groups; i++) {
747 16293 uint8_t exp_min = exp[k];
748
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 16293 if (exp[k+1] < exp_min)
749 6241 exp_min = exp[k+1];
750
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 16293 if (exp[k+2] < exp_min)
751 2923 exp_min = exp[k+2];
752
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 16293 if (exp[k+3] < exp_min)
753 1930 exp_min = exp[k+3];
754 16293 exp[i-cpl] = exp_min;
755 16293 k += 4;
756 }
757 697 break;
758 }
759
760 /* constraint for DC exponent */
761
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 3710 if (!cpl && exp[0] > 15)
762 816 exp[0] = 15;
763
764 /* decrease the delta between each groups to within 2 so that they can be
765 differentially encoded */
766
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 325829 for (i = 1; i <= nb_groups; i++)
767 322119 exp[i] = FFMIN(exp[i], exp[i-1] + 2);
768 3710 i--;
769
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 325829 while (--i >= 0)
770 322119 exp[i] = FFMIN(exp[i], exp[i+1] + 2);
771
772
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 3710 if (cpl)
773 1450 exp[-1] = exp[0] & ~1;
774
775 /* now we have the exponent values the decoder will see */
776
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 3710 switch (exp_strategy) {
777 547 case EXP_D25:
778
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 26353 for (i = nb_groups, k = (nb_groups * 2)-cpl; i > 0; i--) {
779 25806 uint8_t exp1 = exp[i-cpl];
780 25806 exp[k--] = exp1;
781 25806 exp[k--] = exp1;
782 }
783 547 break;
784 697 case EXP_D45:
785
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 16990 for (i = nb_groups, k = (nb_groups * 4)-cpl; i > 0; i--) {
786 16293 exp[k] = exp[k-1] = exp[k-2] = exp[k-3] = exp[i-cpl];
787 16293 k -= 4;
788 }
789 697 break;
790 }
791 3710 }
792
793
794 /*
795 * Encode exponents from original extracted form to what the decoder will see.
796 * This copies and groups exponents based on exponent strategy and reduces
797 * deltas between adjacent exponent groups so that they can be differentially
798 * encoded.
799 */
800 1231 static void encode_exponents(AC3EncodeContext *s)
801 {
802 int blk, blk1, ch, cpl;
803 uint8_t *exp, *exp_strategy;
804 int nb_coefs, num_reuse_blocks;
805
806
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 3948 for (ch = !s->cpl_on; ch <= s->channels; ch++) {
807 2717 exp = s->blocks[0].exp[ch] + s->start_freq[ch];
808 2717 exp_strategy = s->exp_strategy[ch];
809
810 2717 cpl = (ch == CPL_CH);
811 2717 blk = 0;
812
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 6427 while (blk < s->num_blocks) {
813 3710 AC3Block *block = &s->blocks[blk];
814
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 3710 if (cpl && !block->cpl_in_use) {
815 ✗ exp += AC3_MAX_COEFS;
816 ✗ blk++;
817 ✗ continue;
818 }
819 3710 nb_coefs = block->end_freq[ch] - s->start_freq[ch];
820 3710 blk1 = blk + 1;
821
822 /* count the number of EXP_REUSE blocks after the current block
823 and set exponent reference block numbers */
824 3710 s->exp_ref_block[ch][blk] = blk;
825
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 16302 while (blk1 < s->num_blocks && exp_strategy[blk1] == EXP_REUSE) {
826 12592 s->exp_ref_block[ch][blk1] = blk;
827 12592 blk1++;
828 }
829 3710 num_reuse_blocks = blk1 - blk - 1;
830
831 /* for the EXP_REUSE case we select the min of the exponents */
832 3710 s->ac3dsp.ac3_exponent_min(exp-s->start_freq[ch], num_reuse_blocks,
833 AC3_MAX_COEFS);
834
835 3710 encode_exponents_blk_ch(exp, nb_coefs, exp_strategy[blk], cpl);
836
837 3710 exp += AC3_MAX_COEFS * (num_reuse_blocks + 1);
838 3710 blk = blk1;
839 }
840 }
841
842 /* reference block numbers have been changed, so reset ref_bap_set */
843 1231 s->ref_bap_set = 0;
844 1231 }
845
846
847 /*
848 * Count exponent bits based on bandwidth, coupling, and exponent strategies.
849 */
850 1231 static int count_exponent_bits(AC3EncodeContext *s)
851 {
852 int blk, ch;
853 int nb_groups, bit_count;
854
855 1231 bit_count = 0;
856
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 8617 for (blk = 0; blk < s->num_blocks; blk++) {
857 7386 AC3Block *block = &s->blocks[blk];
858
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 23688 for (ch = !block->cpl_in_use; ch <= s->channels; ch++) {
859 16302 int exp_strategy = s->exp_strategy[ch][blk];
860 16302 int cpl = (ch == CPL_CH);
861 16302 int nb_coefs = block->end_freq[ch] - s->start_freq[ch];
862
863
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 16302 if (exp_strategy == EXP_REUSE)
864 12592 continue;
865
866 3710 nb_groups = exponent_group_tab[cpl][exp_strategy-1][nb_coefs];
867 3710 bit_count += 4 + (nb_groups * 7);
868 }
869 }
870
871 1231 return bit_count;
872 }
873
874
875 /**
876 * Group exponents.
877 * 3 delta-encoded exponents are in each 7-bit group. The number of groups
878 * varies depending on exponent strategy and bandwidth.
879 *
880 * @param s AC-3 encoder private context
881 */
882 1231 static void ac3_group_exponents(AC3EncodeContext *s)
883 {
884 int blk, ch, i, cpl;
885 int group_size, nb_groups;
886 uint8_t *p;
887 int delta0, delta1, delta2;
888 int exp0, exp1;
889
890
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 8617 for (blk = 0; blk < s->num_blocks; blk++) {
891 7386 AC3Block *block = &s->blocks[blk];
892
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 23688 for (ch = !block->cpl_in_use; ch <= s->channels; ch++) {
893 16302 int exp_strategy = s->exp_strategy[ch][blk];
894
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 16302 if (exp_strategy == EXP_REUSE)
895 12592 continue;
896 3710 cpl = (ch == CPL_CH);
897 3710 group_size = exp_strategy + (exp_strategy == EXP_D45);
898 3710 nb_groups = exponent_group_tab[cpl][exp_strategy-1][block->end_freq[ch]-s->start_freq[ch]];
899 3710 p = block->exp[ch] + s->start_freq[ch] - cpl;
900
901 /* DC exponent */
902 3710 exp1 = *p++;
903 3710 block->grouped_exp[ch][0] = exp1;
904
905 /* remaining exponents are delta encoded */
906
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 111083 for (i = 1; i <= nb_groups; i++) {
907 /* merge three delta in one code */
908 107373 exp0 = exp1;
909 107373 exp1 = p[0];
910 107373 p += group_size;
911 107373 delta0 = exp1 - exp0 + 2;
912 av_assert2(delta0 >= 0 && delta0 <= 4);
913
914 107373 exp0 = exp1;
915 107373 exp1 = p[0];
916 107373 p += group_size;
917 107373 delta1 = exp1 - exp0 + 2;
918 av_assert2(delta1 >= 0 && delta1 <= 4);
919
920 107373 exp0 = exp1;
921 107373 exp1 = p[0];
922 107373 p += group_size;
923 107373 delta2 = exp1 - exp0 + 2;
924 av_assert2(delta2 >= 0 && delta2 <= 4);
925
926 107373 block->grouped_exp[ch][i] = ((delta0 * 5 + delta1) * 5) + delta2;
927 }
928 }
929 }
930 1231 }
931
932
933 /**
934 * Calculate final exponents from the supplied MDCT coefficients and exponent shift.
935 * Extract exponents from MDCT coefficients, calculate exponent strategies,
936 * and encode final exponents.
937 *
938 * @param s AC-3 encoder private context
939 */
940 1231 static void ac3_process_exponents(AC3EncodeContext *s)
941 {
942 1231 extract_exponents(s);
943
944 1231 compute_exp_strategy(s);
945
946 1231 encode_exponents(s);
947 1231 }
948
949
950 /*
951 * Count frame bits that are based solely on fixed parameters.
952 * This only has to be run once when the encoder is initialized.
953 */
954 11 static void count_frame_bits_fixed(AC3EncodeContext *s)
955 {
956 static const uint8_t frame_bits_inc[8] = { 0, 0, 2, 2, 2, 4, 2, 4 };
957 int blk;
958 int frame_bits;
959
960 /* assumptions:
961 * no dynamic range codes
962 * bit allocation parameters do not change between blocks
963 * no delta bit allocation
964 * no skipped data
965 * no auxiliary data
966 * no E-AC-3 metadata
967 */
968
969 /* header */
970 11 frame_bits = 16; /* sync info */
971
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 11 if (s->eac3) {
972 /* bitstream info header */
973 1 frame_bits += 35;
974 1 frame_bits += 1 + 1;
975
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 1 if (s->num_blocks != 0x6)
976 ✗ frame_bits++;
977 1 frame_bits++;
978 /* audio frame header */
979
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 1 if (s->num_blocks == 6)
980 1 frame_bits += 2;
981 1 frame_bits += 10;
982 /* exponent strategy */
983
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 1 if (s->use_frame_exp_strategy)
984 ✗ frame_bits += 5 * s->fbw_channels;
985 else
986 1 frame_bits += s->num_blocks * 2 * s->fbw_channels;
987
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 1 if (s->lfe_on)
988 ✗ frame_bits += s->num_blocks;
989 /* converter exponent strategy */
990
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 1 if (s->num_blks_code != 0x3)
991 ✗ frame_bits++;
992 else
993 1 frame_bits += s->fbw_channels * 5;
994 /* snr offsets */
995 1 frame_bits += 10;
996 /* block start info */
997
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 1 if (s->num_blocks != 1)
998 1 frame_bits++;
999 } else {
1000 10 frame_bits += 49;
1001 10 frame_bits += frame_bits_inc[s->channel_mode];
1002 }
1003
1004 /* audio blocks */
1005
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 77 for (blk = 0; blk < s->num_blocks; blk++) {
1006
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 66 if (!s->eac3) {
1007 /* block switch flags */
1008 60 frame_bits += s->fbw_channels;
1009
1010 /* dither flags */
1011 60 frame_bits += s->fbw_channels;
1012 }
1013
1014 /* dynamic range */
1015 66 frame_bits++;
1016
1017 /* spectral extension */
1018
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 66 if (s->eac3)
1019 6 frame_bits++;
1020
1021 /* coupling strategy exists: cplstre */
1022
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 66 if (!s->eac3)
1023 60 frame_bits++;
1024
1025
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 66 if (!s->eac3) {
1026 /* exponent strategy */
1027 60 frame_bits += 2 * s->fbw_channels;
1028
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 60 if (s->lfe_on)
1029 6 frame_bits++;
1030
1031 /* bit allocation params */
1032 60 frame_bits++;
1033
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 60 if (!blk)
1034 10 frame_bits += 2 + 2 + 2 + 2 + 3;
1035 }
1036
1037 /* snroffste for AC-3, convsnroffste for E-AC-3 */
1038 66 frame_bits++;
1039
1040
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 66 if (!s->eac3) {
1041 /* delta bit allocation */
1042 60 frame_bits++;
1043
1044 /* skipped data */
1045 60 frame_bits++;
1046 }
1047 }
1048
1049 /* auxiliary data */
1050 11 frame_bits++;
1051
1052 /* CRC */
1053 11 frame_bits += 1 + 16;
1054
1055 11 s->frame_bits_fixed = frame_bits;
1056 11 }
1057
1058
1059 /*
1060 * Initialize bit allocation.
1061 * Set default parameter codes and calculate parameter values.
1062 */
1063 11 static av_cold void bit_alloc_init(AC3EncodeContext *s)
1064 {
1065 int ch;
1066
1067 /* init default parameters */
1068 11 s->slow_decay_code = 2;
1069 11 s->fast_decay_code = 1;
1070 11 s->slow_gain_code = 1;
1071
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 11 s->db_per_bit_code = s->eac3 ? 2 : 3;
1072 11 s->floor_code = 7;
1073
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 41 for (ch = 0; ch <= s->channels; ch++)
1074 30 s->fast_gain_code[ch] = 4;
1075
1076 /* initial snr offset */
1077 11 s->coarse_snr_offset = 40;
1078
1079 /* compute real values */
1080 /* currently none of these values change during encoding, so we can just
1081 set them once at initialization */
1082 11 s->bit_alloc.slow_decay = ff_ac3_slow_decay_tab[s->slow_decay_code];
1083 11 s->bit_alloc.fast_decay = ff_ac3_fast_decay_tab[s->fast_decay_code];
1084 11 s->bit_alloc.slow_gain = ff_ac3_slow_gain_tab[s->slow_gain_code];
1085 11 s->bit_alloc.db_per_bit = ff_ac3_db_per_bit_tab[s->db_per_bit_code];
1086 11 s->bit_alloc.floor = ff_ac3_floor_tab[s->floor_code];
1087 11 s->bit_alloc.cpl_fast_leak = 0;
1088 11 s->bit_alloc.cpl_slow_leak = 0;
1089
1090 11 count_frame_bits_fixed(s);
1091 11 }
1092
1093
1094 /*
1095 * Count the bits used to encode the frame, minus exponents and mantissas.
1096 * Bits based on fixed parameters have already been counted, so now we just
1097 * have to add the bits based on parameters that change during encoding.
1098 */
1099 1231 static void count_frame_bits(AC3EncodeContext *s)
1100 {
1101 1231 AC3EncOptions *opt = &s->options;
1102 int blk, ch;
1103 1231 int frame_bits = 0;
1104
1105 /* header */
1106
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 1231 if (s->eac3) {
1107
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 273 if (opt->eac3_mixing_metadata) {
1108 ✗ if (s->channel_mode > AC3_CHMODE_STEREO)
1109 ✗ frame_bits += 2;
1110 ✗ if (s->has_center)
1111 ✗ frame_bits += 6;
1112 ✗ if (s->has_surround)
1113 ✗ frame_bits += 6;
1114 ✗ frame_bits += s->lfe_on;
1115 ✗ frame_bits += 1 + 1 + 2;
1116 ✗ if (s->channel_mode < AC3_CHMODE_STEREO)
1117 ✗ frame_bits++;
1118 ✗ frame_bits++;
1119 }
1120
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 273 if (opt->eac3_info_metadata) {
1121 ✗ frame_bits += 3 + 1 + 1;
1122 ✗ if (s->channel_mode == AC3_CHMODE_STEREO)
1123 ✗ frame_bits += 2 + 2;
1124 ✗ if (s->channel_mode >= AC3_CHMODE_2F2R)
1125 ✗ frame_bits += 2;
1126 ✗ frame_bits++;
1127 ✗ if (opt->audio_production_info)
1128 ✗ frame_bits += 5 + 2 + 1;
1129 ✗ frame_bits++;
1130 }
1131 /* coupling */
1132
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 273 if (s->channel_mode > AC3_CHMODE_MONO) {
1133 273 frame_bits++;
1134
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 1638 for (blk = 1; blk < s->num_blocks; blk++) {
1135 1365 AC3Block *block = &s->blocks[blk];
1136 1365 frame_bits++;
1137
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 1365 if (block->new_cpl_strategy)
1138 ✗ frame_bits++;
1139 }
1140 }
1141 /* coupling exponent strategy */
1142
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 273 if (s->cpl_on) {
1143
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 273 if (s->use_frame_exp_strategy) {
1144 273 frame_bits += 5;
1145 } else {
1146 ✗ for (blk = 0; blk < s->num_blocks; blk++)
1147 ✗ frame_bits += 2 * s->blocks[blk].cpl_in_use;
1148 }
1149 }
1150 } else {
1151
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 958 if (opt->audio_production_info)
1152 ✗ frame_bits += 7;
1153
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 958 if (s->bitstream_id == 6) {
1154 ✗ if (opt->extended_bsi_1)
1155 ✗ frame_bits += 14;
1156 ✗ if (opt->extended_bsi_2)
1157 ✗ frame_bits += 14;
1158 }
1159 }
1160
1161 /* audio blocks */
1162
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 8617 for (blk = 0; blk < s->num_blocks; blk++) {
1163 7386 AC3Block *block = &s->blocks[blk];
1164
1165 /* coupling strategy */
1166
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 7386 if (block->new_cpl_strategy) {
1167
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 1231 if (!s->eac3)
1168 958 frame_bits++;
1169
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 1231 if (block->cpl_in_use) {
1170
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 727 if (s->eac3)
1171 273 frame_bits++;
1172
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 727 if (!s->eac3 || s->channel_mode != AC3_CHMODE_STEREO)
1173 454 frame_bits += s->fbw_channels;
1174
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 727 if (s->channel_mode == AC3_CHMODE_STEREO)
1175 719 frame_bits++;
1176 727 frame_bits += 4 + 4;
1177
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 727 if (s->eac3)
1178 273 frame_bits++;
1179 else
1180 454 frame_bits += s->num_cpl_subbands - 1;
1181 }
1182 }
1183
1184 /* coupling coordinates */
1185
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 7386 if (block->cpl_in_use) {
1186
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 13230 for (ch = 1; ch <= s->fbw_channels; ch++) {
1187
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 8868 if (block->channel_in_cpl[ch]) {
1188
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 8868 if (!s->eac3 || block->new_cpl_coords[ch] != 2)
1189 8322 frame_bits++;
1190
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 8868 if (block->new_cpl_coords[ch]) {
1191 1513 frame_bits += 2;
1192 1513 frame_bits += (4 + 4) * s->num_cpl_bands;
1193 }
1194 }
1195 }
1196 }
1197
1198 /* stereo rematrixing */
1199
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 7386 if (s->channel_mode == AC3_CHMODE_STEREO) {
1200
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 4314 if (!s->eac3 || blk > 0)
1201 4041 frame_bits++;
1202
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 4314 if (s->blocks[blk].new_rematrixing_strategy)
1203 2197 frame_bits += block->num_rematrixing_bands;
1204 }
1205
1206 /* bandwidth codes & gain range */
1207
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 19278 for (ch = 1; ch <= s->fbw_channels; ch++) {
1208
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 11892 if (s->exp_strategy[ch][blk] != EXP_REUSE) {
1209
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 2252 if (!block->channel_in_cpl[ch])
1210 678 frame_bits += 6;
1211 2252 frame_bits += 2;
1212 }
1213 }
1214
1215 /* coupling exponent strategy */
1216
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 7386 if (!s->eac3 && block->cpl_in_use)
1217 2724 frame_bits += 2;
1218
1219 /* snr offsets and fast gain codes */
1220
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 7386 if (!s->eac3) {
1221
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 5748 if (block->new_snr_offsets)
1222 958 frame_bits += 6 + (s->channels + block->cpl_in_use) * (4 + 3);
1223 }
1224
1225 /* coupling leak info */
1226
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 7386 if (block->cpl_in_use) {
1227
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 4362 if (!s->eac3 || block->new_cpl_leak != 2)
1228 4089 frame_bits++;
1229
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 4362 if (block->new_cpl_leak)
1230 727 frame_bits += 3 + 3;
1231 }
1232 }
1233
1234 1231 s->frame_bits = s->frame_bits_fixed + frame_bits;
1235 1231 }
1236
1237
1238 /*
1239 * Calculate masking curve based on the final exponents.
1240 * Also calculate the power spectral densities to use in future calculations.
1241 */
1242 1231 static void bit_alloc_masking(AC3EncodeContext *s)
1243 {
1244 int blk, ch;
1245
1246
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 8617 for (blk = 0; blk < s->num_blocks; blk++) {
1247 7386 AC3Block *block = &s->blocks[blk];
1248
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 23688 for (ch = !block->cpl_in_use; ch <= s->channels; ch++) {
1249 /* We only need psd and mask for calculating bap.
1250 Since we currently do not calculate bap when exponent
1251 strategy is EXP_REUSE we do not need to calculate psd or mask. */
1252
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 16302 if (s->exp_strategy[ch][blk] != EXP_REUSE) {
1253 3710 ff_ac3_bit_alloc_calc_psd(block->exp[ch], s->start_freq[ch],
1254 block->end_freq[ch], block->psd[ch],
1255 block->band_psd[ch]);
1256 3710 ff_ac3_bit_alloc_calc_mask(&s->bit_alloc, block->band_psd[ch],
1257 s->start_freq[ch], block->end_freq[ch],
1258 3710 ff_ac3_fast_gain_tab[s->fast_gain_code[ch]],
1259 3710 ch == s->lfe_channel,
1260 DBA_NONE, 0, NULL, NULL, NULL,
1261 block->mask[ch]);
1262 }
1263 }
1264 }
1265 1231 }
1266
1267
1268 /*
1269 * Ensure that bap for each block and channel point to the current bap_buffer.
1270 * They may have been switched during the bit allocation search.
1271 */
1272 11676 static void reset_block_bap(AC3EncodeContext *s)
1273 {
1274 int blk, ch;
1275 uint8_t *ref_bap;
1276
1277
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 11676 if (s->ref_bap[0][0] == s->bap_buffer && s->ref_bap_set)
1278 3967 return;
1279
1280 7709 ref_bap = s->bap_buffer;
1281
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 27832 for (ch = 0; ch <= s->channels; ch++) {
1282
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 140861 for (blk = 0; blk < s->num_blocks; blk++)
1283 120738 s->ref_bap[ch][blk] = ref_bap + AC3_MAX_COEFS * s->exp_ref_block[ch][blk];
1284 20123 ref_bap += AC3_MAX_COEFS * s->num_blocks;
1285 }
1286 7709 s->ref_bap_set = 1;
1287 }
1288
1289
1290 /**
1291 * Initialize mantissa counts.
1292 * These are set so that they are padded to the next whole group size when bits
1293 * are counted in compute_mantissa_size.
1294 *
1295 * @param[in,out] mant_cnt running counts for each bap value for each block
1296 */
1297 10445 static void count_mantissa_bits_init(uint16_t mant_cnt[AC3_MAX_BLOCKS][16])
1298 {
1299 int blk;
1300
1301
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 73115 for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) {
1302 62670 memset(mant_cnt[blk], 0, sizeof(mant_cnt[blk]));
1303 62670 mant_cnt[blk][1] = mant_cnt[blk][2] = 2;
1304 62670 mant_cnt[blk][4] = 1;
1305 }
1306 10445 }
1307
1308
1309 /**
1310 * Update mantissa bit counts for all blocks in 1 channel in a given bandwidth
1311 * range.
1312 *
1313 * @param s AC-3 encoder private context
1314 * @param ch channel index
1315 * @param[in,out] mant_cnt running counts for each bap value for each block
1316 * @param start starting coefficient bin
1317 * @param end ending coefficient bin
1318 */
1319 22945 static void count_mantissa_bits_update_ch(AC3EncodeContext *s, int ch,
1320 uint16_t mant_cnt[AC3_MAX_BLOCKS][16],
1321 int start, int end)
1322 {
1323 int blk;
1324
1325
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 160615 for (blk = 0; blk < s->num_blocks; blk++) {
1326 137670 AC3Block *block = &s->blocks[blk];
1327
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 137670 if (ch == CPL_CH && !block->cpl_in_use)
1328 ✗ continue;
1329 137670 s->ac3dsp.update_bap_counts(mant_cnt[blk],
1330 137670 s->ref_bap[ch][blk] + start,
1331 137670 FFMIN(end, block->end_freq[ch]) - start);
1332 }
1333 22945 }
1334
1335
1336 /*
1337 * Count the number of mantissa bits in the frame based on the bap values.
1338 */
1339 10445 static int count_mantissa_bits(AC3EncodeContext *s)
1340 {
1341 int ch, max_end_freq;
1342 10445 LOCAL_ALIGNED_16(uint16_t, mant_cnt, [AC3_MAX_BLOCKS], [16]);
1343
1344 10445 count_mantissa_bits_init(mant_cnt);
1345
1346 10445 max_end_freq = s->bandwidth_code * 3 + 73;
1347
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 33390 for (ch = !s->cpl_enabled; ch <= s->channels; ch++)
1348 22945 count_mantissa_bits_update_ch(s, ch, mant_cnt, s->start_freq[ch],
1349 max_end_freq);
1350
1351 10445 return s->ac3dsp.compute_mantissa_size(mant_cnt);
1352 }
1353
1354
1355 /**
1356 * Run the bit allocation with a given SNR offset.
1357 * This calculates the bit allocation pointers that will be used to determine
1358 * the quantization of each mantissa.
1359 *
1360 * @param s AC-3 encoder private context
1361 * @param snr_offset SNR offset, 0 to 1023
1362 * @return the number of bits needed for mantissas if the given SNR offset is
1363 * is used.
1364 */
1365 10445 static int bit_alloc(AC3EncodeContext *s, int snr_offset)
1366 {
1367 int blk, ch;
1368
1369 10445 snr_offset = (snr_offset - 240) * 4;
1370
1371 10445 reset_block_bap(s);
1372
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 73115 for (blk = 0; blk < s->num_blocks; blk++) {
1373 62670 AC3Block *block = &s->blocks[blk];
1374
1375
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 200340 for (ch = !block->cpl_in_use; ch <= s->channels; ch++) {
1376 /* Currently the only bit allocation parameters which vary across
1377 blocks within a frame are the exponent values. We can take
1378 advantage of that by reusing the bit allocation pointers
1379 whenever we reuse exponents. */
1380
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 137670 if (s->exp_strategy[ch][blk] != EXP_REUSE) {
1381 31573 s->ac3dsp.bit_alloc_calc_bap(block->mask[ch], block->psd[ch],
1382 s->start_freq[ch], block->end_freq[ch],
1383 snr_offset, s->bit_alloc.floor,
1384 ff_ac3_bap_tab, s->ref_bap[ch][blk]);
1385 }
1386 }
1387 }
1388 10445 return count_mantissa_bits(s);
1389 }
1390
1391
1392 /*
1393 * Constant bitrate bit allocation search.
1394 * Find the largest SNR offset that will allow data to fit in the frame.
1395 */
1396 1231 static int cbr_bit_allocation(AC3EncodeContext *s)
1397 {
1398 int ch;
1399 int bits_left;
1400 int snr_offset, snr_incr;
1401
1402 1231 bits_left = 8 * s->frame_size - (s->frame_bits + s->exponent_bits);
1403
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 1231 if (bits_left < 0)
1404 ✗ return AVERROR(EINVAL);
1405
1406 1231 snr_offset = s->coarse_snr_offset << 4;
1407
1408 /* if previous frame SNR offset was 1023, check if current frame can also
1409 use SNR offset of 1023. if so, skip the search. */
1410
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 1231 if ((snr_offset | s->fine_snr_offset[1]) == 1023) {
1411 ✗ if (bit_alloc(s, 1023) <= bits_left)
1412 ✗ return 0;
1413 }
1414
1415
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 3010 while (snr_offset >= 0 &&
1416 1505 bit_alloc(s, snr_offset) > bits_left) {
1417 274 snr_offset -= 64;
1418 }
1419
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 1231 if (snr_offset < 0)
1420 ✗ return AVERROR(EINVAL);
1421
1422 1231 FFSWAP(uint8_t *, s->bap_buffer, s->bap1_buffer);
1423
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 6155 for (snr_incr = 64; snr_incr > 0; snr_incr >>= 2) {
1424
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 17880 while (snr_offset + snr_incr <= 1023 &&
1425 8940 bit_alloc(s, snr_offset + snr_incr) <= bits_left) {
1426 4016 snr_offset += snr_incr;
1427 4016 FFSWAP(uint8_t *, s->bap_buffer, s->bap1_buffer);
1428 }
1429 }
1430 1231 FFSWAP(uint8_t *, s->bap_buffer, s->bap1_buffer);
1431 1231 reset_block_bap(s);
1432
1433 1231 s->coarse_snr_offset = snr_offset >> 4;
1434
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 3948 for (ch = !s->cpl_on; ch <= s->channels; ch++)
1435 2717 s->fine_snr_offset[ch] = snr_offset & 0xF;
1436
1437 1231 return 0;
1438 }
1439
1440
1441 /*
1442 * Perform bit allocation search.
1443 * Finds the SNR offset value that maximizes quality and fits in the specified
1444 * frame size. Output is the SNR offset and a set of bit allocation pointers
1445 * used to quantize the mantissas.
1446 */
1447 1231 static int ac3_compute_bit_allocation(AC3EncodeContext *s)
1448 {
1449 1231 count_frame_bits(s);
1450
1451 1231 s->exponent_bits = count_exponent_bits(s);
1452
1453 1231 bit_alloc_masking(s);
1454
1455 1231 return cbr_bit_allocation(s);
1456 }
1457
1458
1459 /**
1460 * Symmetric quantization on 'levels' levels.
1461 *
1462 * @param c unquantized coefficient
1463 * @param e exponent
1464 * @param levels number of quantization levels
1465 * @return quantized coefficient
1466 */
1467 1069919 static inline int sym_quant(int c, int e, int levels)
1468 {
1469 1069919 int v = (((levels * c) >> (24 - e)) + levels) >> 1;
1470 av_assert2(v >= 0 && v < levels);
1471 1069919 return v;
1472 }
1473
1474
1475 /**
1476 * Asymmetric quantization on 2^qbits levels.
1477 *
1478 * @param c unquantized coefficient
1479 * @param e exponent
1480 * @param qbits number of quantization bits
1481 * @return quantized coefficient
1482 */
1483 154051 static inline int asym_quant(int c, int e, int qbits)
1484 {
1485 int m;
1486
1487 154051 c = (((c * (1<<e)) >> (24 - qbits)) + 1) >> 1;
1488 154051 m = (1 << (qbits-1));
1489
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 154051 if (c >= m)
1490 166 c = m - 1;
1491 av_assert2(c >= -m);
1492 154051 return c;
1493 }
1494
1495
1496 /**
1497 * Quantize a set of mantissas for a single channel in a single block.
1498 *
1499 * @param s Mantissa count context
1500 * @param fixed_coef unquantized fixed-point coefficients
1501 * @param exp exponents
1502 * @param bap bit allocation pointer indices
1503 * @param[out] qmant quantized coefficients
1504 * @param start_freq starting coefficient bin
1505 * @param end_freq ending coefficient bin
1506 */
1507 16302 static void quantize_mantissas_blk_ch(AC3Mant *s, int32_t *fixed_coef,
1508 uint8_t *exp, uint8_t *bap,
1509 int16_t *qmant, int start_freq,
1510 int end_freq)
1511 {
1512 int i;
1513
1514
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 1850274 for (i = start_freq; i < end_freq; i++) {
1515 1833972 int c = fixed_coef[i];
1516 1833972 int e = exp[i];
1517 1833972 int v = bap[i];
1518
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 1833972 switch (v) {
1519 610002 case 0:
1520 610002 break;
1521 513992 case 1:
1522 513992 v = sym_quant(c, e, 3);
1523
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 513992 switch (s->mant1_cnt) {
1524 173578 case 0:
1525 173578 s->qmant1_ptr = &qmant[i];
1526 173578 v = 9 * v;
1527 173578 s->mant1_cnt = 1;
1528 173578 break;
1529 171479 case 1:
1530 171479 *s->qmant1_ptr += 3 * v;
1531 171479 s->mant1_cnt = 2;
1532 171479 v = 128;
1533 171479 break;
1534 168935 default:
1535 168935 *s->qmant1_ptr += v;
1536 168935 s->mant1_cnt = 0;
1537 168935 v = 128;
1538 168935 break;
1539 }
1540 513992 break;
1541 198146 case 2:
1542 198146 v = sym_quant(c, e, 5);
1543
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 198146 switch (s->mant2_cnt) {
1544 68242 case 0:
1545 68242 s->qmant2_ptr = &qmant[i];
1546 68242 v = 25 * v;
1547 68242 s->mant2_cnt = 1;
1548 68242 break;
1549 66073 case 1:
1550 66073 *s->qmant2_ptr += 5 * v;
1551 66073 s->mant2_cnt = 2;
1552 66073 v = 128;
1553 66073 break;
1554 63831 default:
1555 63831 *s->qmant2_ptr += v;
1556 63831 s->mant2_cnt = 0;
1557 63831 v = 128;
1558 63831 break;
1559 }
1560 198146 break;
1561 203232 case 3:
1562 203232 v = sym_quant(c, e, 7);
1563 203232 break;
1564 89226 case 4:
1565 89226 v = sym_quant(c, e, 11);
1566
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 89226 switch (s->mant4_cnt) {
1567 45901 case 0:
1568 45901 s->qmant4_ptr = &qmant[i];
1569 45901 v = 11 * v;
1570 45901 s->mant4_cnt = 1;
1571 45901 break;
1572 43325 default:
1573 43325 *s->qmant4_ptr += v;
1574 43325 s->mant4_cnt = 0;
1575 43325 v = 128;
1576 43325 break;
1577 }
1578 89226 break;
1579 65323 case 5:
1580 65323 v = sym_quant(c, e, 15);
1581 65323 break;
1582 13221 case 14:
1583 13221 v = asym_quant(c, e, 14);
1584 13221 break;
1585 7452 case 15:
1586 7452 v = asym_quant(c, e, 16);
1587 7452 break;
1588 133378 default:
1589 133378 v = asym_quant(c, e, v - 1);
1590 133378 break;
1591 }
1592 1833972 qmant[i] = v;
1593 }
1594 16302 }
1595
1596
1597 /**
1598 * Quantize mantissas using coefficients, exponents, and bit allocation pointers.
1599 *
1600 * @param s AC-3 encoder private context
1601 */
1602 1231 static void ac3_quantize_mantissas(AC3EncodeContext *s)
1603 {
1604 1231 int blk, ch, ch0=0, got_cpl;
1605
1606
2/2
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 8617 for (blk = 0; blk < s->num_blocks; blk++) {
1607 7386 AC3Block *block = &s->blocks[blk];
1608 7386 AC3Mant m = { 0 };
1609
1610 7386 got_cpl = !block->cpl_in_use;
1611
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 23688 for (ch = 1; ch <= s->channels; ch++) {
1612
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 16302 if (!got_cpl && ch > 1 && block->channel_in_cpl[ch-1]) {
1613 4362 ch0 = ch - 1;
1614 4362 ch = CPL_CH;
1615 4362 got_cpl = 1;
1616 }
1617 16302 quantize_mantissas_blk_ch(&m, block->fixed_coef[ch],
1618 16302 s->blocks[s->exp_ref_block[ch][blk]].exp[ch],
1619 16302 s->ref_bap[ch][blk], block->qmant[ch],
1620 s->start_freq[ch], block->end_freq[ch]);
1621
2/2
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 16302 if (ch == CPL_CH)
1622 4362 ch = ch0;
1623 }
1624 }
1625 1231 }
1626
1627
1628 /*
1629 * Write the AC-3 frame header to the output bitstream.
1630 */
1631 958 static void ac3_output_frame_header(AC3EncodeContext *s, PutBitContext *pb)
1632 {
1633 958 AC3EncOptions *opt = &s->options;
1634
1635 958 put_bits_assume_flushed(pb);
1636
1637 958 put_bits(pb, 16, 0x0b77); /* frame header */
1638 958 put_bits(pb, 16, 0); /* crc1: will be filled later */
1639 958 put_bits(pb, 2, s->bit_alloc.sr_code);
1640 958 put_bits(pb, 6, s->frame_size_code + (s->frame_size - s->frame_size_min) / 2);
1641 958 put_bits(pb, 5, s->bitstream_id);
1642 958 put_bits(pb, 3, s->bitstream_mode);
1643 958 put_bits(pb, 3, s->channel_mode);
1644
4/4
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 958 if ((s->channel_mode & 0x01) && s->channel_mode != AC3_CHMODE_MONO)
1645 8 put_bits(pb, 2, s->center_mix_level);
1646
2/2
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 958 if (s->channel_mode & 0x04)
1647 8 put_bits(pb, 2, s->surround_mix_level);
1648
2/2
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 958 if (s->channel_mode == AC3_CHMODE_STEREO)
1649 446 put_bits(pb, 2, opt->dolby_surround_mode);
1650 958 put_bits(pb, 1, s->lfe_on); /* LFE */
1651 958 put_bits(pb, 5, -opt->dialogue_level);
1652 958 put_bits(pb, 1, 0); /* no compression control word */
1653 958 put_bits(pb, 1, 0); /* no lang code */
1654 958 put_bits(pb, 1, opt->audio_production_info);
1655
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 958 if (opt->audio_production_info) {
1656 ✗ put_bits(pb, 5, opt->mixing_level - 80);
1657 ✗ put_bits(pb, 2, opt->room_type);
1658 }
1659 958 put_bits(pb, 1, opt->copyright);
1660 958 put_bits(pb, 1, opt->original);
1661
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 958 if (s->bitstream_id == 6) {
1662 /* alternate bit stream syntax */
1663 ✗ put_bits(pb, 1, opt->extended_bsi_1);
1664 ✗ if (opt->extended_bsi_1) {
1665 ✗ put_bits(pb, 2, opt->preferred_stereo_downmix);
1666 ✗ put_bits(pb, 3, s->ltrt_center_mix_level);
1667 ✗ put_bits(pb, 3, s->ltrt_surround_mix_level);
1668 ✗ put_bits(pb, 3, s->loro_center_mix_level);
1669 ✗ put_bits(pb, 3, s->loro_surround_mix_level);
1670 }
1671 ✗ put_bits(pb, 1, opt->extended_bsi_2);
1672 ✗ if (opt->extended_bsi_2) {
1673 ✗ put_bits(pb, 2, opt->dolby_surround_ex_mode);
1674 ✗ put_bits(pb, 2, opt->dolby_headphone_mode);
1675 ✗ put_bits(pb, 1, opt->ad_converter_type);
1676 ✗ put_bits(pb, 9, 0); /* xbsi2 and encinfo : reserved */
1677 }
1678 } else {
1679 958 put_bits(pb, 1, 0); /* no time code 1 */
1680 958 put_bits(pb, 1, 0); /* no time code 2 */
1681 }
1682 958 put_bits(pb, 1, 0); /* no additional bit stream info */
1683 958 }
1684
1685
1686 /*
1687 * Write one audio block to the output bitstream.
1688 */
1689 7386 static void output_audio_block(AC3EncodeContext *s, PutBitContext *pb, int blk)
1690 {
1691 7386 int ch, i, baie, bnd, got_cpl, av_uninit(ch0);
1692 7386 AC3Block *block = &s->blocks[blk];
1693
1694 /* block switching */
1695
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 7386 if (!s->eac3) {
1696
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 14364 for (ch = 0; ch < s->fbw_channels; ch++)
1697 8616 put_bits(pb, 1, 0);
1698 }
1699
1700 /* dither flags */
1701
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 7386 if (!s->eac3) {
1702
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 14364 for (ch = 0; ch < s->fbw_channels; ch++)
1703 8616 put_bits(pb, 1, 1);
1704 }
1705
1706 /* dynamic range codes */
1707 7386 put_bits(pb, 1, 0);
1708
1709 /* spectral extension */
1710
2/2
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 7386 if (s->eac3)
1711 1638 put_bits(pb, 1, 0);
1712
1713 /* channel coupling */
1714
2/2
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 7386 if (!s->eac3)
1715 5748 put_bits(pb, 1, block->new_cpl_strategy);
1716
2/2
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 7386 if (block->new_cpl_strategy) {
1717
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✓ Branch 1 taken 273 times.
 1231 if (!s->eac3)
1718 958 put_bits(pb, 1, block->cpl_in_use);
1719
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 1231 if (block->cpl_in_use) {
1720 int start_sub, end_sub;
1721
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 727 if (s->eac3)
1722 273 put_bits(pb, 1, 0); /* enhanced coupling */
1723
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✗ Branch 2 not taken.
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 727 if (!s->eac3 || s->channel_mode != AC3_CHMODE_STEREO) {
1724
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 1386 for (ch = 1; ch <= s->fbw_channels; ch++)
1725 932 put_bits(pb, 1, block->channel_in_cpl[ch]);
1726 }
1727
2/2
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 727 if (s->channel_mode == AC3_CHMODE_STEREO)
1728 719 put_bits(pb, 1, 0); /* phase flags in use */
1729 727 start_sub = (s->start_freq[CPL_CH] - 37) / 12;
1730 727 end_sub = (s->cpl_end_freq - 37) / 12;
1731 727 put_bits(pb, 4, start_sub);
1732 727 put_bits(pb, 4, end_sub - 3);
1733 /* coupling band structure */
1734
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 727 if (s->eac3) {
1735 273 put_bits(pb, 1, 0); /* use default */
1736 } else {
1737
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 2254 for (bnd = start_sub+1; bnd < end_sub; bnd++)
1738 1800 put_bits(pb, 1, ff_eac3_default_cpl_band_struct[bnd]);
1739 }
1740 }
1741 }
1742
1743 /* coupling coordinates */
1744
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 7386 if (block->cpl_in_use) {
1745
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 13230 for (ch = 1; ch <= s->fbw_channels; ch++) {
1746
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 8868 if (block->channel_in_cpl[ch]) {
1747
4/4
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 8868 if (!s->eac3 || block->new_cpl_coords[ch] != 2)
1748 8322 put_bits(pb, 1, block->new_cpl_coords[ch]);
1749
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 8868 if (block->new_cpl_coords[ch]) {
1750 1513 put_bits(pb, 2, block->cpl_master_exp[ch]);
1751
2/2
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 7479 for (bnd = 0; bnd < s->num_cpl_bands; bnd++) {
1752 5966 put_bits(pb, 4, block->cpl_coord_exp [ch][bnd]);
1753 5966 put_bits(pb, 4, block->cpl_coord_mant[ch][bnd]);
1754 }
1755 }
1756 }
1757 }
1758 }
1759
1760 /* stereo rematrixing */
1761
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 7386 if (s->channel_mode == AC3_CHMODE_STEREO) {
1762
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 4314 if (!s->eac3 || blk > 0)
1763 4041 put_bits(pb, 1, block->new_rematrixing_strategy);
1764
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 4314 if (block->new_rematrixing_strategy) {
1765 /* rematrixing flags */
1766
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 10985 for (bnd = 0; bnd < block->num_rematrixing_bands; bnd++)
1767 8788 put_bits(pb, 1, block->rematrixing_flags[bnd]);
1768 }
1769 }
1770
1771 /* exponent strategy */
1772
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 7386 if (!s->eac3) {
1773
2/2
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 17088 for (ch = !block->cpl_in_use; ch <= s->fbw_channels; ch++)
1774 11340 put_bits(pb, 2, s->exp_strategy[ch][blk]);
1775
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 5748 if (s->lfe_on)
1776 48 put_bits(pb, 1, s->exp_strategy[s->lfe_channel][blk]);
1777 }
1778
1779 /* bandwidth */
1780
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 19278 for (ch = 1; ch <= s->fbw_channels; ch++) {
1781
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✓ Branch 3 taken 1574 times.
 11892 if (s->exp_strategy[ch][blk] != EXP_REUSE && !block->channel_in_cpl[ch])
1782 678 put_bits(pb, 6, s->bandwidth_code);
1783 }
1784
1785 /* exponents */
1786
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 23688 for (ch = !block->cpl_in_use; ch <= s->channels; ch++) {
1787 int nb_groups;
1788 16302 int cpl = (ch == CPL_CH);
1789
1790
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 16302 if (s->exp_strategy[ch][blk] == EXP_REUSE)
1791 12592 continue;
1792
1793 /* DC exponent */
1794 3710 put_bits(pb, 4, block->grouped_exp[ch][0] >> cpl);
1795
1796 /* exponent groups */
1797 3710 nb_groups = exponent_group_tab[cpl][s->exp_strategy[ch][blk]-1][block->end_freq[ch]-s->start_freq[ch]];
1798
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 111083 for (i = 1; i <= nb_groups; i++)
1799 107373 put_bits(pb, 7, block->grouped_exp[ch][i]);
1800
1801 /* gain range info */
1802
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 3710 if (ch != s->lfe_channel && !cpl)
1803 2252 put_bits(pb, 2, 0);
1804 }
1805
1806 /* bit allocation info */
1807
2/2
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 7386 if (!s->eac3) {
1808 5748 baie = (blk == 0);
1809 5748 put_bits(pb, 1, baie);
1810
2/2
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 5748 if (baie) {
1811 958 put_bits(pb, 2, s->slow_decay_code);
1812 958 put_bits(pb, 2, s->fast_decay_code);
1813 958 put_bits(pb, 2, s->slow_gain_code);
1814 958 put_bits(pb, 2, s->db_per_bit_code);
1815 958 put_bits(pb, 3, s->floor_code);
1816 }
1817 }
1818
1819 /* snr offset */
1820
2/2
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 7386 if (!s->eac3) {
1821 5748 put_bits(pb, 1, block->new_snr_offsets);
1822
2/2
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 5748 if (block->new_snr_offsets) {
1823 958 put_bits(pb, 6, s->coarse_snr_offset);
1824
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 2856 for (ch = !block->cpl_in_use; ch <= s->channels; ch++) {
1825 1898 put_bits(pb, 4, s->fine_snr_offset[ch]);
1826 1898 put_bits(pb, 3, s->fast_gain_code[ch]);
1827 }
1828 }
1829 } else {
1830 1638 put_bits(pb, 1, 0); /* no converter snr offset */
1831 }
1832
1833 /* coupling leak */
1834
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 7386 if (block->cpl_in_use) {
1835
4/4
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 4362 if (!s->eac3 || block->new_cpl_leak != 2)
1836 4089 put_bits(pb, 1, block->new_cpl_leak);
1837
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 4362 if (block->new_cpl_leak) {
1838 727 put_bits(pb, 3, s->bit_alloc.cpl_fast_leak);
1839 727 put_bits(pb, 3, s->bit_alloc.cpl_slow_leak);
1840 }
1841 }
1842
1843
2/2
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 7386 if (!s->eac3) {
1844 5748 put_bits(pb, 1, 0); /* no delta bit allocation */
1845 5748 put_bits(pb, 1, 0); /* no data to skip */
1846 }
1847
1848 /* mantissas */
1849 7386 got_cpl = !block->cpl_in_use;
1850
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 23688 for (ch = 1; ch <= s->channels; ch++) {
1851 int b, q;
1852
1853
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 16302 if (!got_cpl && ch > 1 && block->channel_in_cpl[ch-1]) {
1854 4362 ch0 = ch - 1;
1855 4362 ch = CPL_CH;
1856 4362 got_cpl = 1;
1857 }
1858
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 1850274 for (i = s->start_freq[ch]; i < block->end_freq[ch]; i++) {
1859 1833972 q = block->qmant[ch][i];
1860 1833972 b = s->ref_bap[ch][blk][i];
1861
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 1833972 switch (b) {
1862 610002 case 0: break;
1863
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 513992 case 1: if (q != 128) put_bits (pb, 5, q); break;
1864
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 198146 case 2: if (q != 128) put_bits (pb, 7, q); break;
1865 203232 case 3: put_sbits(pb, 3, q); break;
1866
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 89226 case 4: if (q != 128) put_bits (pb, 7, q); break;
1867 13221 case 14: put_sbits(pb, 14, q); break;
1868 7452 case 15: put_sbits(pb, 16, q); break;
1869 198701 default: put_sbits(pb, b-1, q); break;
1870 }
1871 }
1872
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 16302 if (ch == CPL_CH)
1873 4362 ch = ch0;
1874 }
1875 7386 }
1876
1877
1878 /** CRC-16 Polynomial */
1879 #define CRC16_POLY ((1 << 0) | (1 << 2) | (1 << 15) | (1 << 16))
1880
1881
1882 1289 static unsigned int mul_poly(unsigned int a, unsigned int b, unsigned int poly)
1883 {
1884 unsigned int c;
1885
1886 1289 c = 0;
1887
2/2
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 20458 while (a) {
1888
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 19169 if (a & 1)
1889 8925 c ^= b;
1890 19169 a = a >> 1;
1891 19169 b = b << 1;
1892
2/2
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 19169 if (b & (1 << 16))
1893 9138 b ^= poly;
1894 }
1895 1289 return c;
1896 }
1897
1898
1899 22 static unsigned int pow_poly(unsigned int a, unsigned int n, unsigned int poly)
1900 {
1901 unsigned int r;
1902 22 r = 1;
1903
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 286 while (n) {
1904
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 264 if (n & 1)
1905 67 r = mul_poly(r, a, poly);
1906 264 a = mul_poly(a, a, poly);
1907 264 n >>= 1;
1908 }
1909 22 return r;
1910 }
1911
1912
1913 /*
1914 * Fill the end of the frame with 0's and compute the two CRCs.
1915 */
1916 1231 static void output_frame_end(AC3EncodeContext *s, PutBitContext *pb)
1917 {
1918 1231 const AVCRC *crc_ctx = av_crc_get_table(AV_CRC_16_ANSI);
1919 int frame_size_58, pad_bytes, crc1, crc2, crc_inv;
1920 uint8_t *frame;
1921
1922 1231 frame_size_58 = ((s->frame_size >> 2) + (s->frame_size >> 4)) << 1;
1923
1924 /* pad the remainder of the frame with zeros */
1925 av_assert2(s->frame_size * 8 - put_bits_count(pb) >= 18);
1926 1231 flush_put_bits(pb);
1927 1231 frame = pb->buf;
1928 1231 pad_bytes = s->frame_size - (put_bits_ptr(pb) - frame) - 2;
1929 av_assert2(pad_bytes >= 0);
1930
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 1231 if (pad_bytes > 0)
1931 1090 memset(put_bits_ptr(pb), 0, pad_bytes);
1932
1933
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 1231 if (s->eac3) {
1934 /* compute crc2 */
1935 273 crc2 = av_crc(crc_ctx, 0, frame + 2, s->frame_size - 4);
1936 } else {
1937 /* compute crc1 */
1938 /* this is not so easy because it is at the beginning of the data... */
1939 958 crc1 = av_bswap16(av_crc(crc_ctx, 0, frame + 4, frame_size_58 - 4));
1940 958 crc_inv = s->crc_inv[s->frame_size > s->frame_size_min];
1941 958 crc1 = mul_poly(crc_inv, crc1, CRC16_POLY);
1942 958 AV_WB16(frame + 2, crc1);
1943
1944 /* compute crc2 */
1945 958 crc2 = av_crc(crc_ctx, 0, frame + frame_size_58,
1946 958 s->frame_size - frame_size_58 - 2);
1947 }
1948 1231 crc2 = av_bswap16(crc2);
1949 /* ensure crc2 does not match sync word by flipping crcrsv bit if needed */
1950
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 1231 if (crc2 == 0x0B77) {
1951 /* The CRC generator polynomial is x^16 + x^15 + x^2 + 1,
1952 * so xor'ing with 0x18005 does not affect the CRC. */
1953 ✗ frame[s->frame_size - 3] ^= 0x1;
1954 ✗ crc2 ^= 0x8005;
1955 }
1956 1231 AV_WB16(frame + s->frame_size - 2, crc2);
1957 1231 }
1958
1959
1960 /**
1961 * Write the frame to the output bitstream.
1962 *
1963 * @param s AC-3 encoder private context
1964 * @param frame output data buffer
1965 */
1966 1231 static void ac3_output_frame(AC3EncodeContext *s, unsigned char *frame)
1967 {
1968 PutBitContext pb;
1969 int blk;
1970
1971 1231 init_put_bits(&pb, frame, s->frame_size);
1972
1973 1231 s->output_frame_header(s, &pb);
1974
1975
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 8617 for (blk = 0; blk < s->num_blocks; blk++)
1976 7386 output_audio_block(s, &pb, blk);
1977
1978 1231 output_frame_end(s, &pb);
1979 1231 }
1980
1981 1231 int ff_ac3_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
1982 const AVFrame *frame, int *got_packet_ptr)
1983 {
1984 1231 AC3EncodeContext *const s = avctx->priv_data;
1985 int ret;
1986
1987
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 1231 if (s->options.allow_per_frame_metadata) {
1988 ✗ ret = ac3_validate_metadata(s);
1989 ✗ if (ret)
1990 ✗ return ret;
1991 }
1992
1993
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 1231 if (s->bit_alloc.sr_code == 1 || s->eac3)
1994 1231 ac3_adjust_frame_size(s);
1995
1996 1231 s->encode_frame(s, frame->extended_data);
1997
1998 1231 ac3_apply_rematrixing(s);
1999
2000 1231 ac3_process_exponents(s);
2001
2002 1231 ret = ac3_compute_bit_allocation(s);
2003
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 1231 if (ret) {
2004 ✗ av_log(avctx, AV_LOG_ERROR, "Bit allocation failed. Try increasing the bitrate.\n");
2005 ✗ return ret;
2006 }
2007
2008 1231 ac3_group_exponents(s);
2009
2010 1231 ac3_quantize_mantissas(s);
2011
2012 1231 ret = ff_get_encode_buffer(avctx, avpkt, s->frame_size, 0);
2013
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 1231 if (ret < 0)
2014 ✗ return ret;
2015 1231 ac3_output_frame(s, avpkt->data);
2016
2017
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✗ Branch 1 not taken.
 1231 if (frame->pts != AV_NOPTS_VALUE)
2018 1231 avpkt->pts = frame->pts - ff_samples_to_time_base(avctx, avctx->initial_padding);
2019
2020 1231 *got_packet_ptr = 1;
2021 1231 return 0;
2022 }
2023
2024 11 static void dprint_options(AC3EncodeContext *s)
2025 {
2026 #ifdef DEBUG
2027 AVCodecContext *avctx = s->avctx;
2028 AC3EncOptions *opt = &s->options;
2029 const char *msg;
2030 char strbuf[32];
2031
2032 switch (s->bitstream_id) {
2033 case 6: msg = "AC-3 (alt syntax)"; break;
2034 case 8: msg = "AC-3 (standard)"; break;
2035 case 16: msg = "E-AC-3 (enhanced)"; break;
2036 default: msg = "ERROR";
2037 }
2038 ff_dlog(avctx, "bitstream_id: %s (%d)\n", msg, s->bitstream_id);
2039 ff_dlog(avctx, "sample_fmt: %s\n", av_get_sample_fmt_name(avctx->sample_fmt));
2040 av_channel_layout_describe(&avctx->ch_layout, strbuf, sizeof(strbuf));
2041 ff_dlog(avctx, "channel_layout: %s\n", strbuf);
2042 ff_dlog(avctx, "sample_rate: %d\n", s->sample_rate);
2043 ff_dlog(avctx, "bit_rate: %d\n", s->bit_rate);
2044 ff_dlog(avctx, "blocks/frame: %d (code=%d)\n", s->num_blocks, s->num_blks_code);
2045 if (s->cutoff)
2046 ff_dlog(avctx, "cutoff: %d\n", s->cutoff);
2047
2048 ff_dlog(avctx, "per_frame_metadata: %s\n",
2049 opt->allow_per_frame_metadata?"on":"off");
2050 if (s->has_center)
2051 ff_dlog(avctx, "center_mixlev: %0.3f (%d)\n", opt->center_mix_level,
2052 s->center_mix_level);
2053 else
2054 ff_dlog(avctx, "center_mixlev: {not written}\n");
2055 if (s->has_surround)
2056 ff_dlog(avctx, "surround_mixlev: %0.3f (%d)\n", opt->surround_mix_level,
2057 s->surround_mix_level);
2058 else
2059 ff_dlog(avctx, "surround_mixlev: {not written}\n");
2060 if (opt->audio_production_info) {
2061 ff_dlog(avctx, "mixing_level: %ddB\n", opt->mixing_level);
2062 switch (opt->room_type) {
2063 case AC3ENC_OPT_NOT_INDICATED: msg = "notindicated"; break;
2064 case AC3ENC_OPT_LARGE_ROOM: msg = "large"; break;
2065 case AC3ENC_OPT_SMALL_ROOM: msg = "small"; break;
2066 default:
2067 snprintf(strbuf, sizeof(strbuf), "ERROR (%d)", opt->room_type);
2068 msg = strbuf;
2069 }
2070 ff_dlog(avctx, "room_type: %s\n", msg);
2071 } else {
2072 ff_dlog(avctx, "mixing_level: {not written}\n");
2073 ff_dlog(avctx, "room_type: {not written}\n");
2074 }
2075 ff_dlog(avctx, "copyright: %s\n", opt->copyright?"on":"off");
2076 ff_dlog(avctx, "dialnorm: %ddB\n", opt->dialogue_level);
2077 if (s->channel_mode == AC3_CHMODE_STEREO) {
2078 switch (opt->dolby_surround_mode) {
2079 case AC3ENC_OPT_NOT_INDICATED: msg = "notindicated"; break;
2080 case AC3ENC_OPT_MODE_ON: msg = "on"; break;
2081 case AC3ENC_OPT_MODE_OFF: msg = "off"; break;
2082 default:
2083 snprintf(strbuf, sizeof(strbuf), "ERROR (%d)", opt->dolby_surround_mode);
2084 msg = strbuf;
2085 }
2086 ff_dlog(avctx, "dsur_mode: %s\n", msg);
2087 } else {
2088 ff_dlog(avctx, "dsur_mode: {not written}\n");
2089 }
2090 ff_dlog(avctx, "original: %s\n", opt->original?"on":"off");
2091
2092 if (s->bitstream_id == 6) {
2093 if (opt->extended_bsi_1) {
2094 switch (opt->preferred_stereo_downmix) {
2095 case AC3ENC_OPT_NOT_INDICATED: msg = "notindicated"; break;
2096 case AC3ENC_OPT_DOWNMIX_LTRT: msg = "ltrt"; break;
2097 case AC3ENC_OPT_DOWNMIX_LORO: msg = "loro"; break;
2098 default:
2099 snprintf(strbuf, sizeof(strbuf), "ERROR (%d)", opt->preferred_stereo_downmix);
2100 msg = strbuf;
2101 }
2102 ff_dlog(avctx, "dmix_mode: %s\n", msg);
2103 ff_dlog(avctx, "ltrt_cmixlev: %0.3f (%d)\n",
2104 opt->ltrt_center_mix_level, s->ltrt_center_mix_level);
2105 ff_dlog(avctx, "ltrt_surmixlev: %0.3f (%d)\n",
2106 opt->ltrt_surround_mix_level, s->ltrt_surround_mix_level);
2107 ff_dlog(avctx, "loro_cmixlev: %0.3f (%d)\n",
2108 opt->loro_center_mix_level, s->loro_center_mix_level);
2109 ff_dlog(avctx, "loro_surmixlev: %0.3f (%d)\n",
2110 opt->loro_surround_mix_level, s->loro_surround_mix_level);
2111 } else {
2112 ff_dlog(avctx, "extended bitstream info 1: {not written}\n");
2113 }
2114 if (opt->extended_bsi_2) {
2115 switch (opt->dolby_surround_ex_mode) {
2116 case AC3ENC_OPT_NOT_INDICATED: msg = "notindicated"; break;
2117 case AC3ENC_OPT_MODE_ON: msg = "on"; break;
2118 case AC3ENC_OPT_MODE_OFF: msg = "off"; break;
2119 default:
2120 snprintf(strbuf, sizeof(strbuf), "ERROR (%d)", opt->dolby_surround_ex_mode);
2121 msg = strbuf;
2122 }
2123 ff_dlog(avctx, "dsurex_mode: %s\n", msg);
2124 switch (opt->dolby_headphone_mode) {
2125 case AC3ENC_OPT_NOT_INDICATED: msg = "notindicated"; break;
2126 case AC3ENC_OPT_MODE_ON: msg = "on"; break;
2127 case AC3ENC_OPT_MODE_OFF: msg = "off"; break;
2128 default:
2129 snprintf(strbuf, sizeof(strbuf), "ERROR (%d)", opt->dolby_headphone_mode);
2130 msg = strbuf;
2131 }
2132 ff_dlog(avctx, "dheadphone_mode: %s\n", msg);
2133
2134 switch (opt->ad_converter_type) {
2135 case AC3ENC_OPT_ADCONV_STANDARD: msg = "standard"; break;
2136 case AC3ENC_OPT_ADCONV_HDCD: msg = "hdcd"; break;
2137 default:
2138 snprintf(strbuf, sizeof(strbuf), "ERROR (%d)", opt->ad_converter_type);
2139 msg = strbuf;
2140 }
2141 ff_dlog(avctx, "ad_conv_type: %s\n", msg);
2142 } else {
2143 ff_dlog(avctx, "extended bitstream info 2: {not written}\n");
2144 }
2145 }
2146 #endif
2147 11 }
2148
2149 /**
2150 * Finalize encoding and free any memory allocated by the encoder.
2151 *
2152 * @param avctx Codec context
2153 */
2154 11 av_cold int ff_ac3_encode_close(AVCodecContext *avctx)
2155 {
2156 11 AC3EncodeContext *s = avctx->priv_data;
2157
2158
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 30 for (int ch = 0; ch < s->channels; ch++)
2159 19 av_freep(&s->planar_samples[ch]);
2160 11 av_freep(&s->bap_buffer);
2161 11 av_freep(&s->bap1_buffer);
2162 11 av_freep(&s->mdct_coef_buffer);
2163 11 av_freep(&s->fixed_coef_buffer);
2164 11 av_freep(&s->exp_buffer);
2165 11 av_freep(&s->grouped_exp_buffer);
2166 11 av_freep(&s->psd_buffer);
2167 11 av_freep(&s->band_psd_buffer);
2168 11 av_freep(&s->mask_buffer);
2169 11 av_freep(&s->qmant_buffer);
2170 11 av_freep(&s->cpl_coord_buffer);
2171 11 av_freep(&s->fdsp);
2172
2173 11 av_tx_uninit(&s->tx);
2174
2175 11 return 0;
2176 }
2177
2178
2179 /*
2180 * Set channel information during initialization.
2181 */
2182 11 static av_cold void set_channel_info(AVCodecContext *avctx)
2183 {
2184 11 AC3EncodeContext *s = avctx->priv_data;
2185 11 uint64_t mask = av_channel_layout_subset(&avctx->ch_layout, ~(uint64_t)0);
2186 11 int channels = avctx->ch_layout.nb_channels;
2187
2188 11 s->lfe_on = !!(mask & AV_CH_LOW_FREQUENCY);
2189 11 s->channels = channels;
2190 11 s->fbw_channels = channels - s->lfe_on;
2191
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 11 s->lfe_channel = s->lfe_on ? s->fbw_channels + 1 : -1;
2192
2193
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 11 switch (mask & ~AV_CH_LOW_FREQUENCY) {
2194 7 case AV_CH_LAYOUT_MONO: s->channel_mode = AC3_CHMODE_MONO; break;
2195 3 case AV_CH_LAYOUT_STEREO: s->channel_mode = AC3_CHMODE_STEREO; break;
2196 ✗ case AV_CH_LAYOUT_SURROUND: s->channel_mode = AC3_CHMODE_3F; break;
2197 ✗ case AV_CH_LAYOUT_2_1: s->channel_mode = AC3_CHMODE_2F1R; break;
2198 ✗ case AV_CH_LAYOUT_4POINT0: s->channel_mode = AC3_CHMODE_3F1R; break;
2199 ✗ case AV_CH_LAYOUT_QUAD:
2200 ✗ case AV_CH_LAYOUT_2_2: s->channel_mode = AC3_CHMODE_2F2R; break;
2201 1 case AV_CH_LAYOUT_5POINT0:
2202 1 case AV_CH_LAYOUT_5POINT0_BACK: s->channel_mode = AC3_CHMODE_3F2R; break;
2203 }
2204
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 11 s->has_center = (s->channel_mode & 0x01) && s->channel_mode != AC3_CHMODE_MONO;
2205 11 s->has_surround = s->channel_mode & 0x04;
2206
2207 11 s->channel_map = ac3_enc_channel_map[s->channel_mode][s->lfe_on];
2208 11 }
2209
2210
2211 11 static av_cold int validate_options(AC3EncodeContext *s)
2212 {
2213 11 AVCodecContext *avctx = s->avctx;
2214 int ret;
2215
2216 11 set_channel_info(avctx);
2217
2218 22 for (int i = 0;; i++) {
2219
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 22 if (ff_ac3_sample_rate_tab[i] == avctx->sample_rate) {
2220 11 s->bit_alloc.sr_code = i;
2221 11 break;
2222 }
2223 av_assert1(ff_ac3_sample_rate_tab[i] != 0);
2224 }
2225 11 s->sample_rate = avctx->sample_rate;
2226
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 11 s->bitstream_id = s->eac3 ? 16 : 8;
2227
2228 /* select a default bit rate if not set by the user */
2229
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 11 if (!avctx->bit_rate) {
2230
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 6 switch (s->fbw_channels) {
2231 6 case 1: avctx->bit_rate = 96000; break;
2232 ✗ case 2: avctx->bit_rate = 192000; break;
2233 ✗ case 3: avctx->bit_rate = 320000; break;
2234 ✗ case 4: avctx->bit_rate = 384000; break;
2235 ✗ case 5: avctx->bit_rate = 448000; break;
2236 }
2237 }
2238
2239 /* validate bit rate */
2240
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 11 if (s->eac3) {
2241 int max_br, min_br, wpf, min_br_code;
2242 int num_blks_code, num_blocks, frame_samples;
2243 long long min_br_dist;
2244
2245 /* calculate min/max bitrate */
2246 /* TODO: More testing with 3 and 2 blocks. All E-AC-3 samples I've
2247 found use either 6 blocks or 1 block, even though 2 or 3 blocks
2248 would work as far as the bit rate is concerned. */
2249
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 1 for (num_blks_code = 3; num_blks_code >= 0; num_blks_code--) {
2250 1 num_blocks = ((int[]){ 1, 2, 3, 6 })[num_blks_code];
2251 1 frame_samples = AC3_BLOCK_SIZE * num_blocks;
2252 1 max_br = 2048 * s->sample_rate / frame_samples * 16;
2253 1 min_br = ((s->sample_rate + (frame_samples-1)) / frame_samples) * 16;
2254
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 1 if (avctx->bit_rate <= max_br)
2255 1 break;
2256 }
2257
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 1 if (avctx->bit_rate < min_br || avctx->bit_rate > max_br) {
2258 ✗ av_log(avctx, AV_LOG_ERROR, "invalid bit rate. must be %d to %d "
2259 "for this sample rate\n", min_br, max_br);
2260 ✗ return AVERROR(EINVAL);
2261 }
2262 1 s->num_blks_code = num_blks_code;
2263 1 s->num_blocks = num_blocks;
2264
2265 /* calculate words-per-frame for the selected bitrate */
2266 1 wpf = (avctx->bit_rate / 16) * frame_samples / s->sample_rate;
2267 av_assert1(wpf > 0 && wpf <= 2048);
2268
2269 /* find the closest AC-3 bitrate code to the selected bitrate.
2270 this is needed for lookup tables for bandwidth and coupling
2271 parameter selection */
2272 1 min_br_code = -1;
2273 1 min_br_dist = INT64_MAX;
2274
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 20 for (int i = 0; i < 19; i++) {
2275 19 long long br_dist = llabs(ff_ac3_bitrate_tab[i] * 1000 - avctx->bit_rate);
2276
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 19 if (br_dist < min_br_dist) {
2277 9 min_br_dist = br_dist;
2278 9 min_br_code = i;
2279 }
2280 }
2281
2282 /* make sure the minimum frame size is below the average frame size */
2283 1 s->frame_size_code = min_br_code << 1;
2284
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 1 while (wpf > 1 && wpf * s->sample_rate / AC3_FRAME_SIZE * 16 > avctx->bit_rate)
2285 ✗ wpf--;
2286 1 s->frame_size_min = 2 * wpf;
2287 } else {
2288 10 int best_br = 0, best_code = 0;
2289 10 long long best_diff = INT64_MAX;
2290
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 78 for (int i = 0; i < 19; i++) {
2291 78 int br = ff_ac3_bitrate_tab[i] * 1000;
2292 78 long long diff = llabs(br - avctx->bit_rate);
2293
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 78 if (diff < best_diff) {
2294 78 best_br = br;
2295 78 best_code = i;
2296 78 best_diff = diff;
2297 }
2298
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 78 if (!best_diff)
2299 10 break;
2300 }
2301 10 avctx->bit_rate = best_br;
2302 10 s->frame_size_code = best_code << 1;
2303 10 s->frame_size_min = 2 * ff_ac3_frame_size_tab[s->frame_size_code][s->bit_alloc.sr_code];
2304 10 s->num_blks_code = 0x3;
2305 10 s->num_blocks = 6;
2306 }
2307 11 s->bit_rate = avctx->bit_rate;
2308 11 s->frame_size = s->frame_size_min;
2309
2310 /* validate cutoff */
2311
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 11 if (avctx->cutoff < 0) {
2312 ✗ av_log(avctx, AV_LOG_ERROR, "invalid cutoff frequency\n");
2313 ✗ return AVERROR(EINVAL);
2314 }
2315 11 s->cutoff = avctx->cutoff;
2316
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 11 if (s->cutoff > (s->sample_rate >> 1))
2317 ✗ s->cutoff = s->sample_rate >> 1;
2318
2319 11 ret = ac3_validate_metadata(s);
2320
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 11 if (ret)
2321 ✗ return ret;
2322
2323
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 22 s->rematrixing_enabled = s->options.stereo_rematrixing &&
2324
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 11 (s->channel_mode == AC3_CHMODE_STEREO);
2325
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 22 s->cpl_enabled = s->options.channel_coupling &&
2327
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 11 s->channel_mode >= AC3_CHMODE_STEREO;
2328
2329 11 return 0;
2330 }
2331
2332
2333 /*
2334 * Set bandwidth for all channels.
2335 * The user can optionally supply a cutoff frequency. Otherwise an appropriate
2336 * default value will be used.
2337 */
2338 11 static av_cold void set_bandwidth(AC3EncodeContext *s)
2339 {
2340 11 int blk, ch, av_uninit(cpl_start);
2341
2342
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 11 if (s->cutoff) {
2343 /* calculate bandwidth based on user-specified cutoff frequency */
2344 int fbw_coeffs;
2345 ✗ fbw_coeffs = s->cutoff * 2 * AC3_MAX_COEFS / s->sample_rate;
2346 ✗ s->bandwidth_code = av_clip((fbw_coeffs - 73) / 3, 0, 60);
2347 } else {
2348 /* use default bandwidth setting */
2349 11 s->bandwidth_code = ac3_bandwidth_tab[s->fbw_channels-1][s->bit_alloc.sr_code][s->frame_size_code/2];
2350 }
2351
2352 /* set number of coefficients for each channel */
2353
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 29 for (ch = 1; ch <= s->fbw_channels; ch++) {
2354 18 s->start_freq[ch] = 0;
2355
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 126 for (blk = 0; blk < s->num_blocks; blk++)
2356 108 s->blocks[blk].end_freq[ch] = s->bandwidth_code * 3 + 73;
2357 }
2358 /* LFE channel always has 7 coefs */
2359
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 11 if (s->lfe_on) {
2360 1 s->start_freq[s->lfe_channel] = 0;
2361
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 7 for (blk = 0; blk < s->num_blocks; blk++)
2362 6 s->blocks[blk].end_freq[ch] = 7;
2363 }
2364
2365 /* initialize coupling strategy */
2366
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 11 if (s->cpl_enabled) {
2367
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 4 if (s->options.cpl_start != AC3ENC_OPT_AUTO) {
2368 ✗ cpl_start = s->options.cpl_start;
2369 } else {
2370 4 cpl_start = ac3_coupling_start_tab[s->channel_mode-2][s->bit_alloc.sr_code][s->frame_size_code/2];
2371
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 4 if (cpl_start < 0) {
2372 ✗ if (s->options.channel_coupling == AC3ENC_OPT_AUTO)
2373 ✗ s->cpl_enabled = 0;
2374 else
2375 ✗ cpl_start = 15;
2376 }
2377 }
2378 }
2379
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 11 if (s->cpl_enabled) {
2380 int i, cpl_start_band, cpl_end_band;
2381 4 uint8_t *cpl_band_sizes = s->cpl_band_sizes;
2382
2383 4 cpl_end_band = s->bandwidth_code / 4 + 3;
2384 4 cpl_start_band = av_clip(cpl_start, 0, FFMIN(cpl_end_band-1, 15));
2385
2386 4 s->num_cpl_subbands = cpl_end_band - cpl_start_band;
2387
2388 4 s->num_cpl_bands = 1;
2389 4 *cpl_band_sizes = 12;
2390
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 18 for (i = cpl_start_band + 1; i < cpl_end_band; i++) {
2391
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 14 if (ff_eac3_default_cpl_band_struct[i]) {
2392 4 *cpl_band_sizes += 12;
2393 } else {
2394 10 s->num_cpl_bands++;
2395 10 cpl_band_sizes++;
2396 10 *cpl_band_sizes = 12;
2397 }
2398 }
2399
2400 4 s->start_freq[CPL_CH] = cpl_start_band * 12 + 37;
2401 4 s->cpl_end_freq = cpl_end_band * 12 + 37;
2402
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 28 for (blk = 0; blk < s->num_blocks; blk++)
2403 24 s->blocks[blk].end_freq[CPL_CH] = s->cpl_end_freq;
2404 }
2405 11 }
2406
2407
2408 11 static av_cold int allocate_buffers(AC3EncodeContext *s)
2409 {
2410 int blk, ch;
2411 11 int channels = s->channels + 1; /* includes coupling channel */
2412 11 int channel_blocks = channels * s->num_blocks;
2413 11 int total_coefs = AC3_MAX_COEFS * channel_blocks;
2414 uint8_t *cpl_coord_mant_buffer;
2415 11 const unsigned sampletype_size = SAMPLETYPE_SIZE(s);
2416
2417
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 30 for (int ch = 0; ch < s->channels; ch++) {
2418 19 s->planar_samples[ch] = av_mallocz(AC3_BLOCK_SIZE * sampletype_size);
2419
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 19 if (!s->planar_samples[ch])
2420 ✗ return AVERROR(ENOMEM);
2421 }
2422
2423
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 11 if (!FF_ALLOC_TYPED_ARRAY(s->bap_buffer, total_coefs) ||
2424
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 11 !FF_ALLOC_TYPED_ARRAY(s->bap1_buffer, total_coefs) ||
2425
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 11 !FF_ALLOCZ_TYPED_ARRAY(s->mdct_coef_buffer, total_coefs) ||
2426
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 11 !FF_ALLOC_TYPED_ARRAY(s->exp_buffer, total_coefs) ||
2427
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 11 !FF_ALLOC_TYPED_ARRAY(s->grouped_exp_buffer, channel_blocks * 128) ||
2428
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 11 !FF_ALLOC_TYPED_ARRAY(s->psd_buffer, total_coefs) ||
2429
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 11 !FF_ALLOC_TYPED_ARRAY(s->band_psd_buffer, channel_blocks * 64) ||
2430
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 11 !FF_ALLOC_TYPED_ARRAY(s->mask_buffer, channel_blocks * 64) ||
2431
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 11 !FF_ALLOC_TYPED_ARRAY(s->qmant_buffer, total_coefs))
2432 ✗ return AVERROR(ENOMEM);
2433
2434
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 11 if (!s->fixed_point) {
2435
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 2 if (!FF_ALLOCZ_TYPED_ARRAY(s->fixed_coef_buffer, total_coefs))
2436 ✗ return AVERROR(ENOMEM);
2437 }
2438
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 11 if (s->cpl_enabled) {
2439
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 4 if (!FF_ALLOC_TYPED_ARRAY(s->cpl_coord_buffer, channel_blocks * 32))
2440 ✗ return AVERROR(ENOMEM);
2441 4 cpl_coord_mant_buffer = s->cpl_coord_buffer + 16 * channel_blocks;
2442 }
2443
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 77 for (blk = 0; blk < s->num_blocks; blk++) {
2444 66 AC3Block *block = &s->blocks[blk];
2445
2446
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 246 for (ch = 0; ch < channels; ch++) {
2447 /* arrangement: block, channel, coeff */
2448 180 block->grouped_exp[ch] = &s->grouped_exp_buffer[128 * (blk * channels + ch)];
2449 180 block->psd[ch] = &s->psd_buffer [AC3_MAX_COEFS * (blk * channels + ch)];
2450 180 block->band_psd[ch] = &s->band_psd_buffer [64 * (blk * channels + ch)];
2451 180 block->mask[ch] = &s->mask_buffer [64 * (blk * channels + ch)];
2452 180 block->qmant[ch] = &s->qmant_buffer [AC3_MAX_COEFS * (blk * channels + ch)];
2453
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 180 if (s->cpl_enabled) {
2454 96 block->cpl_coord_exp[ch] = &s->cpl_coord_buffer [16 * (blk * channels + ch)];
2455 96 block->cpl_coord_mant[ch] = &cpl_coord_mant_buffer[16 * (blk * channels + ch)];
2456 }
2457
2458 /* arrangement: channel, block, coeff */
2459 180 block->exp[ch] = &s->exp_buffer [AC3_MAX_COEFS * (s->num_blocks * ch + blk)];
2460 180 block->mdct_coef[ch] = &s->mdct_coef_buffer [AC3_MAX_COEFS * (s->num_blocks * ch + blk)];
2461
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 180 if (s->fixed_point)
2462 144 block->fixed_coef[ch] = (int32_t *)block->mdct_coef[ch];
2463 else
2464 36 block->fixed_coef[ch] = &s->fixed_coef_buffer[AC3_MAX_COEFS * (s->num_blocks * ch + blk)];
2465 }
2466 }
2467
2468 11 return 0;
2469 }
2470
2471
2472 11 av_cold int ff_ac3_encode_init(AVCodecContext *avctx)
2473 {
2474 static AVOnce init_static_once = AV_ONCE_INIT;
2475 11 AC3EncodeContext *s = avctx->priv_data;
2476 int ret, frame_size_58;
2477
2478 11 s->avctx = avctx;
2479
2480 11 ret = validate_options(s);
2481
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 11 if (ret)
2482 ✗ return ret;
2483
2484 11 avctx->frame_size = AC3_BLOCK_SIZE * s->num_blocks;
2485 11 avctx->initial_padding = AC3_BLOCK_SIZE;
2486
2487 11 s->bitstream_mode = avctx->audio_service_type;
2488
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 11 if (s->bitstream_mode == AV_AUDIO_SERVICE_TYPE_KARAOKE)
2489 ✗ s->bitstream_mode = 0x7;
2490
2491 11 s->bits_written = 0;
2492 11 s->samples_written = 0;
2493
2494 /* calculate crc_inv for both possible frame sizes */
2495 11 frame_size_58 = (( s->frame_size >> 2) + ( s->frame_size >> 4)) << 1;
2496 11 s->crc_inv[0] = pow_poly((CRC16_POLY >> 1), (8 * frame_size_58) - 16, CRC16_POLY);
2497
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 11 if (s->bit_alloc.sr_code == 1) {
2498 11 frame_size_58 = (((s->frame_size+2) >> 2) + ((s->frame_size+2) >> 4)) << 1;
2499 11 s->crc_inv[1] = pow_poly((CRC16_POLY >> 1), (8 * frame_size_58) - 16, CRC16_POLY);
2500 }
2501
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 11 if (!s->output_frame_header)
2503 10 s->output_frame_header = ac3_output_frame_header;
2504
2505 11 set_bandwidth(s);
2506
2507 11 bit_alloc_init(s);
2508
2509 11 ret = allocate_buffers(s);
2510
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 11 if (ret)
2511 ✗ return ret;
2512
2513 11 ff_audiodsp_init(&s->adsp);
2514 11 ff_me_cmp_init(&s->mecc, avctx);
2515 11 ff_ac3dsp_init(&s->ac3dsp);
2516
2517 11 dprint_options(s);
2518
2519 11 ff_thread_once(&init_static_once, exponent_init);
2520
2521 11 return 0;
2522 }
2523