FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/eac3enc.c
Date: 2022-07-04 19:11:22
Exec Total Coverage
Lines: 89 135 65.9%
Branches: 35 74 47.3%

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1 /*
2 * E-AC-3 encoder
3 * Copyright (c) 2011 Justin Ruggles <justin.ruggles@gmail.com>
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 /**
23 * @file
24 * E-AC-3 encoder
25 */
26
27 #define AC3ENC_FLOAT 1
28
29 #include "libavutil/attributes.h"
30 #include "ac3enc.h"
31 #include "codec_internal.h"
32 #include "eac3enc.h"
33 #include "eac3_data.h"
34
35
36 static const AVClass eac3enc_class = {
37 .class_name = "E-AC-3 Encoder",
38 .item_name = av_default_item_name,
39 .option = &ff_ac3_enc_options[2], /* First two options are AC-3 only. */
40 .version = LIBAVUTIL_VERSION_INT,
41 };
42
43 /**
44 * LUT for finding a matching frame exponent strategy index from a set of
45 * exponent strategies for a single channel across all 6 blocks.
46 */
47 static int8_t eac3_frame_expstr_index_tab[3][4][4][4][4][4];
48
49
50 1 av_cold void ff_eac3_exponent_init(void)
51 {
52 int i;
53
54 1 memset(eac3_frame_expstr_index_tab, -1, sizeof(eac3_frame_expstr_index_tab));
55
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33 for (i = 0; i < 32; i++) {
56 32 eac3_frame_expstr_index_tab[ff_eac3_frm_expstr[i][0]-1]
57 32 [ff_eac3_frm_expstr[i][1]]
58 32 [ff_eac3_frm_expstr[i][2]]
59 32 [ff_eac3_frm_expstr[i][3]]
60 32 [ff_eac3_frm_expstr[i][4]]
61 32 [ff_eac3_frm_expstr[i][5]] = i;
62 }
63 1 }
64
65
66 273 void ff_eac3_get_frame_exp_strategy(AC3EncodeContext *s)
67 {
68 int ch;
69
70
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273 if (s->num_blocks < 6) {
71 s->use_frame_exp_strategy = 0;
72 return;
73 }
74
75 273 s->use_frame_exp_strategy = 1;
76
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1092 for (ch = !s->cpl_on; ch <= s->fbw_channels; ch++) {
77 819 int expstr = eac3_frame_expstr_index_tab[s->exp_strategy[ch][0]-1]
78 819 [s->exp_strategy[ch][1]]
79 819 [s->exp_strategy[ch][2]]
80 819 [s->exp_strategy[ch][3]]
81 819 [s->exp_strategy[ch][4]]
82 819 [s->exp_strategy[ch][5]];
83
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819 if (expstr < 0) {
84 s->use_frame_exp_strategy = 0;
85 break;
86 }
87 819 s->frame_exp_strategy[ch] = expstr;
88 }
89 }
90
91
92
93 273 void ff_eac3_set_cpl_states(AC3EncodeContext *s)
94 {
95 int ch, blk;
96 int first_cpl_coords[AC3_MAX_CHANNELS];
97
98 /* set first cpl coords */
99
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819 for (ch = 1; ch <= s->fbw_channels; ch++)
100 546 first_cpl_coords[ch] = 1;
101
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1911 for (blk = 0; blk < s->num_blocks; blk++) {
102 1638 AC3Block *block = &s->blocks[blk];
103
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4914 for (ch = 1; ch <= s->fbw_channels; ch++) {
104
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3276 if (block->channel_in_cpl[ch]) {
105
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3276 if (first_cpl_coords[ch]) {
106 546 block->new_cpl_coords[ch] = 2;
107 546 first_cpl_coords[ch] = 0;
108 }
109 } else {
110 first_cpl_coords[ch] = 1;
111 }
112 }
113 }
114
115 /* set first cpl leak */
116
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273 for (blk = 0; blk < s->num_blocks; blk++) {
117 273 AC3Block *block = &s->blocks[blk];
118
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273 if (block->cpl_in_use) {
119 273 block->new_cpl_leak = 2;
120 273 break;
121 }
122 }
123 273 }
124
125
126 273 void ff_eac3_output_frame_header(AC3EncodeContext *s)
127 {
128 int blk, ch;
129 273 AC3EncOptions *opt = &s->options;
130
131 273 put_bits(&s->pb, 16, 0x0b77); /* sync word */
132
133 /* BSI header */
134 273 put_bits(&s->pb, 2, 0); /* stream type = independent */
135 273 put_bits(&s->pb, 3, 0); /* substream id = 0 */
136 273 put_bits(&s->pb, 11, (s->frame_size / 2) - 1); /* frame size */
137
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273 if (s->bit_alloc.sr_shift) {
138 put_bits(&s->pb, 2, 0x3); /* fscod2 */
139 put_bits(&s->pb, 2, s->bit_alloc.sr_code); /* sample rate code */
140 } else {
141 273 put_bits(&s->pb, 2, s->bit_alloc.sr_code); /* sample rate code */
142 273 put_bits(&s->pb, 2, s->num_blks_code); /* number of blocks */
143 }
144 273 put_bits(&s->pb, 3, s->channel_mode); /* audio coding mode */
145 273 put_bits(&s->pb, 1, s->lfe_on); /* LFE channel indicator */
146 273 put_bits(&s->pb, 5, s->bitstream_id); /* bitstream id (EAC3=16) */
147 273 put_bits(&s->pb, 5, -opt->dialogue_level); /* dialogue normalization level */
148 273 put_bits(&s->pb, 1, 0); /* no compression gain */
149 /* mixing metadata*/
150 273 put_bits(&s->pb, 1, opt->eac3_mixing_metadata);
151
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273 if (opt->eac3_mixing_metadata) {
152 if (s->channel_mode > AC3_CHMODE_STEREO)
153 put_bits(&s->pb, 2, opt->preferred_stereo_downmix);
154 if (s->has_center) {
155 put_bits(&s->pb, 3, s->ltrt_center_mix_level);
156 put_bits(&s->pb, 3, s->loro_center_mix_level);
157 }
158 if (s->has_surround) {
159 put_bits(&s->pb, 3, s->ltrt_surround_mix_level);
160 put_bits(&s->pb, 3, s->loro_surround_mix_level);
161 }
162 if (s->lfe_on)
163 put_bits(&s->pb, 1, 0);
164 put_bits(&s->pb, 1, 0); /* no program scale */
165 put_bits(&s->pb, 1, 0); /* no ext program scale */
166 put_bits(&s->pb, 2, 0); /* no mixing parameters */
167 if (s->channel_mode < AC3_CHMODE_STEREO)
168 put_bits(&s->pb, 1, 0); /* no pan info */
169 put_bits(&s->pb, 1, 0); /* no frame mix config info */
170 }
171 /* info metadata*/
172 273 put_bits(&s->pb, 1, opt->eac3_info_metadata);
173
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273 if (opt->eac3_info_metadata) {
174 put_bits(&s->pb, 3, s->bitstream_mode);
175 put_bits(&s->pb, 1, opt->copyright);
176 put_bits(&s->pb, 1, opt->original);
177 if (s->channel_mode == AC3_CHMODE_STEREO) {
178 put_bits(&s->pb, 2, opt->dolby_surround_mode);
179 put_bits(&s->pb, 2, opt->dolby_headphone_mode);
180 }
181 if (s->channel_mode >= AC3_CHMODE_2F2R)
182 put_bits(&s->pb, 2, opt->dolby_surround_ex_mode);
183 put_bits(&s->pb, 1, opt->audio_production_info);
184 if (opt->audio_production_info) {
185 put_bits(&s->pb, 5, opt->mixing_level - 80);
186 put_bits(&s->pb, 2, opt->room_type);
187 put_bits(&s->pb, 1, opt->ad_converter_type);
188 }
189 put_bits(&s->pb, 1, 0);
190 }
191
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273 if (s->num_blocks != 6)
192 put_bits(&s->pb, 1, !(s->avctx->frame_number % 6)); /* converter sync flag */
193 273 put_bits(&s->pb, 1, 0); /* no additional bit stream info */
194
195 /* frame header */
196
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273 if (s->num_blocks == 6) {
197 273 put_bits(&s->pb, 1, !s->use_frame_exp_strategy); /* exponent strategy syntax */
198 273 put_bits(&s->pb, 1, 0); /* aht enabled = no */
199 }
200 273 put_bits(&s->pb, 2, 0); /* snr offset strategy = 1 */
201 273 put_bits(&s->pb, 1, 0); /* transient pre-noise processing enabled = no */
202 273 put_bits(&s->pb, 1, 0); /* block switch syntax enabled = no */
203 273 put_bits(&s->pb, 1, 0); /* dither flag syntax enabled = no */
204 273 put_bits(&s->pb, 1, 0); /* bit allocation model syntax enabled = no */
205 273 put_bits(&s->pb, 1, 0); /* fast gain codes enabled = no */
206 273 put_bits(&s->pb, 1, 0); /* dba syntax enabled = no */
207 273 put_bits(&s->pb, 1, 0); /* skip field syntax enabled = no */
208 273 put_bits(&s->pb, 1, 0); /* spx enabled = no */
209 /* coupling strategy use flags */
210
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273 if (s->channel_mode > AC3_CHMODE_MONO) {
211 273 put_bits(&s->pb, 1, s->blocks[0].cpl_in_use);
212
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1638 for (blk = 1; blk < s->num_blocks; blk++) {
213 1365 AC3Block *block = &s->blocks[blk];
214 1365 put_bits(&s->pb, 1, block->new_cpl_strategy);
215
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1365 if (block->new_cpl_strategy)
216 put_bits(&s->pb, 1, block->cpl_in_use);
217 }
218 }
219 /* exponent strategy */
220
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273 if (s->use_frame_exp_strategy) {
221
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1092 for (ch = !s->cpl_on; ch <= s->fbw_channels; ch++)
222 819 put_bits(&s->pb, 5, s->frame_exp_strategy[ch]);
223 } else {
224 for (blk = 0; blk < s->num_blocks; blk++)
225 for (ch = !s->blocks[blk].cpl_in_use; ch <= s->fbw_channels; ch++)
226 put_bits(&s->pb, 2, s->exp_strategy[ch][blk]);
227 }
228
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273 if (s->lfe_on) {
229 for (blk = 0; blk < s->num_blocks; blk++)
230 put_bits(&s->pb, 1, s->exp_strategy[s->lfe_channel][blk]);
231 }
232 /* E-AC-3 to AC-3 converter exponent strategy (not optional when num blocks == 6) */
233
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273 if (s->num_blocks != 6) {
234 put_bits(&s->pb, 1, 0);
235 } else {
236
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819 for (ch = 1; ch <= s->fbw_channels; ch++) {
237
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546 if (s->use_frame_exp_strategy)
238 546 put_bits(&s->pb, 5, s->frame_exp_strategy[ch]);
239 else
240 put_bits(&s->pb, 5, 0);
241 }
242 }
243 /* snr offsets */
244 273 put_bits(&s->pb, 6, s->coarse_snr_offset);
245 273 put_bits(&s->pb, 4, s->fine_snr_offset[1]);
246 /* block start info */
247
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273 if (s->num_blocks > 1)
248 273 put_bits(&s->pb, 1, 0);
249 273 }
250
251
252 FF_DISABLE_DEPRECATION_WARNINGS
253 const FFCodec ff_eac3_encoder = {
254 .p.name = "eac3",
255 .p.long_name = NULL_IF_CONFIG_SMALL("ATSC A/52 E-AC-3"),
256 .p.type = AVMEDIA_TYPE_AUDIO,
257 .p.id = AV_CODEC_ID_EAC3,
258 .p.capabilities = AV_CODEC_CAP_DR1,
259 .priv_data_size = sizeof(AC3EncodeContext),
260 .init = ff_ac3_float_encode_init,
261 FF_CODEC_ENCODE_CB(ff_ac3_float_encode_frame),
262 .close = ff_ac3_encode_close,
263 .p.sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_FLTP,
264 AV_SAMPLE_FMT_NONE },
265 .p.priv_class = &eac3enc_class,
266 .p.supported_samplerates = ff_ac3_sample_rate_tab,
267 #if FF_API_OLD_CHANNEL_LAYOUT
268 .p.channel_layouts = ff_ac3_channel_layouts,
269 #endif
270 .p.ch_layouts = ff_ac3_ch_layouts,
271 .defaults = ff_ac3_enc_defaults,
272 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP,
273 };
274 FF_ENABLE_DEPRECATION_WARNINGS
275