FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/eac3enc.c
Date: 2024-11-20 23:03:26
Exec Total Coverage
Lines: 94 138 68.1%
Functions: 5 5 100.0%
Branches: 34 72 47.2%
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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 "libavutil/thread.h"
31 #include "ac3enc.h"
32 #include "codec_internal.h"
33 #include "eac3enc.h"
34 #include "eac3_data.h"
35 #include "put_bits.h"
36
37
38 static const AVClass eac3enc_class = {
39 .class_name = "E-AC-3 Encoder",
40 .item_name = av_default_item_name,
41 .option = &ff_ac3_enc_options[2], /* First two options are AC-3 only. */
42 .version = LIBAVUTIL_VERSION_INT,
43 };
44
45 /**
46 * LUT for finding a matching frame exponent strategy index from a set of
47 * exponent strategies for a single channel across all 6 blocks.
48 */
49 static int8_t eac3_frame_expstr_index_tab[3][4][4][4][4][4];
50
51
52 /**
53 * Initialize E-AC-3 exponent tables.
54 */
55 1 static av_cold void eac3_exponent_init(void)
56 {
57 int i;
58
59 1 memset(eac3_frame_expstr_index_tab, -1, sizeof(eac3_frame_expstr_index_tab));
60
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 33 for (i = 0; i < 32; i++) {
61 32 eac3_frame_expstr_index_tab[ff_eac3_frm_expstr[i][0]-1]
62 32 [ff_eac3_frm_expstr[i][1]]
63 32 [ff_eac3_frm_expstr[i][2]]
64 32 [ff_eac3_frm_expstr[i][3]]
65 32 [ff_eac3_frm_expstr[i][4]]
66 32 [ff_eac3_frm_expstr[i][5]] = i;
67 }
68 1 }
69
70
71 273 void ff_eac3_get_frame_exp_strategy(AC3EncodeContext *s)
72 {
73 int ch;
74
75
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 273 if (s->num_blocks < 6) {
76 ✗ s->use_frame_exp_strategy = 0;
77 ✗ return;
78 }
79
80 273 s->use_frame_exp_strategy = 1;
81
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 1092 for (ch = !s->cpl_on; ch <= s->fbw_channels; ch++) {
82 819 int expstr = eac3_frame_expstr_index_tab[s->exp_strategy[ch][0]-1]
83 819 [s->exp_strategy[ch][1]]
84 819 [s->exp_strategy[ch][2]]
85 819 [s->exp_strategy[ch][3]]
86 819 [s->exp_strategy[ch][4]]
87 819 [s->exp_strategy[ch][5]];
88
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 819 if (expstr < 0) {
89 ✗ s->use_frame_exp_strategy = 0;
90 ✗ break;
91 }
92 819 s->frame_exp_strategy[ch] = expstr;
93 }
94 }
95
96
97
98 273 void ff_eac3_set_cpl_states(AC3EncodeContext *s)
99 {
100 int ch, blk;
101 int first_cpl_coords[AC3_MAX_CHANNELS];
102
103 /* set first cpl coords */
104
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 819 for (ch = 1; ch <= s->fbw_channels; ch++)
105 546 first_cpl_coords[ch] = 1;
106
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 1911 for (blk = 0; blk < s->num_blocks; blk++) {
107 1638 AC3Block *block = &s->blocks[blk];
108
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 4914 for (ch = 1; ch <= s->fbw_channels; ch++) {
109
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 3276 if (block->channel_in_cpl[ch]) {
110
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 3276 if (first_cpl_coords[ch]) {
111 546 block->new_cpl_coords[ch] = 2;
112 546 first_cpl_coords[ch] = 0;
113 }
114 } else {
115 ✗ first_cpl_coords[ch] = 1;
116 }
117 }
118 }
119
120 /* set first cpl leak */
121
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 273 for (blk = 0; blk < s->num_blocks; blk++) {
122 273 AC3Block *block = &s->blocks[blk];
123
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 273 if (block->cpl_in_use) {
124 273 block->new_cpl_leak = 2;
125 273 break;
126 }
127 }
128 273 }
129
130 /**
131 * Write the E-AC-3 frame header to the output bitstream.
132 */
133 273 static void eac3_output_frame_header(AC3EncodeContext *s, PutBitContext *pb)
134 {
135 int blk, ch;
136 273 AC3EncOptions *opt = &s->options;
137
138 273 put_bits(pb, 16, 0x0b77); /* sync word */
139
140 /* BSI header */
141 273 put_bits(pb, 2, 0); /* stream type = independent */
142 273 put_bits(pb, 3, 0); /* substream id = 0 */
143 273 put_bits(pb, 11, (s->frame_size / 2) - 1); /* frame size */
144 273 put_bits(pb, 2, s->bit_alloc.sr_code); /* sample rate code */
145 273 put_bits(pb, 2, s->num_blks_code); /* number of blocks */
146 273 put_bits(pb, 3, s->channel_mode); /* audio coding mode */
147 273 put_bits(pb, 1, s->lfe_on); /* LFE channel indicator */
148 273 put_bits(pb, 5, s->bitstream_id); /* bitstream id (EAC3=16) */
149 273 put_bits(pb, 5, -opt->dialogue_level); /* dialogue normalization level */
150 273 put_bits(pb, 1, 0); /* no compression gain */
151 /* mixing metadata*/
152 273 put_bits(pb, 1, opt->eac3_mixing_metadata);
153
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 273 if (opt->eac3_mixing_metadata) {
154 ✗ if (s->channel_mode > AC3_CHMODE_STEREO)
155 ✗ put_bits(pb, 2, opt->preferred_stereo_downmix);
156 ✗ if (s->has_center) {
157 ✗ put_bits(pb, 3, s->ltrt_center_mix_level);
158 ✗ put_bits(pb, 3, s->loro_center_mix_level);
159 }
160 ✗ if (s->has_surround) {
161 ✗ put_bits(pb, 3, s->ltrt_surround_mix_level);
162 ✗ put_bits(pb, 3, s->loro_surround_mix_level);
163 }
164 ✗ if (s->lfe_on)
165 ✗ put_bits(pb, 1, 0);
166 ✗ put_bits(pb, 1, 0); /* no program scale */
167 ✗ put_bits(pb, 1, 0); /* no ext program scale */
168 ✗ put_bits(pb, 2, 0); /* no mixing parameters */
169 ✗ if (s->channel_mode < AC3_CHMODE_STEREO)
170 ✗ put_bits(pb, 1, 0); /* no pan info */
171 ✗ put_bits(pb, 1, 0); /* no frame mix config info */
172 }
173 /* info metadata*/
174 273 put_bits(pb, 1, opt->eac3_info_metadata);
175
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 273 if (opt->eac3_info_metadata) {
176 ✗ put_bits(pb, 3, s->bitstream_mode);
177 ✗ put_bits(pb, 1, opt->copyright);
178 ✗ put_bits(pb, 1, opt->original);
179 ✗ if (s->channel_mode == AC3_CHMODE_STEREO) {
180 ✗ put_bits(pb, 2, opt->dolby_surround_mode);
181 ✗ put_bits(pb, 2, opt->dolby_headphone_mode);
182 }
183 ✗ if (s->channel_mode >= AC3_CHMODE_2F2R)
184 ✗ put_bits(pb, 2, opt->dolby_surround_ex_mode);
185 ✗ put_bits(pb, 1, opt->audio_production_info);
186 ✗ if (opt->audio_production_info) {
187 ✗ put_bits(pb, 5, opt->mixing_level - 80);
188 ✗ put_bits(pb, 2, opt->room_type);
189 ✗ put_bits(pb, 1, opt->ad_converter_type);
190 }
191 ✗ put_bits(pb, 1, 0);
192 }
193
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 273 if (s->num_blocks != 6)
194 ✗ put_bits(pb, 1, !(s->avctx->frame_num % 6)); /* converter sync flag */
195 273 put_bits(pb, 1, 0); /* no additional bit stream info */
196
197 /* frame header */
198
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 273 if (s->num_blocks == 6) {
199 273 put_bits(pb, 1, !s->use_frame_exp_strategy); /* exponent strategy syntax */
200 273 put_bits(pb, 1, 0); /* aht enabled = no */
201 }
202 273 put_bits(pb, 2, 0); /* snr offset strategy = 1 */
203 273 put_bits(pb, 1, 0); /* transient pre-noise processing enabled = no */
204 273 put_bits(pb, 1, 0); /* block switch syntax enabled = no */
205 273 put_bits(pb, 1, 0); /* dither flag syntax enabled = no */
206 273 put_bits(pb, 1, 0); /* bit allocation model syntax enabled = no */
207 273 put_bits(pb, 1, 0); /* fast gain codes enabled = no */
208 273 put_bits(pb, 1, 0); /* dba syntax enabled = no */
209 273 put_bits(pb, 1, 0); /* skip field syntax enabled = no */
210 273 put_bits(pb, 1, 0); /* spx enabled = no */
211 /* coupling strategy use flags */
212
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 273 if (s->channel_mode > AC3_CHMODE_MONO) {
213 273 put_bits(pb, 1, s->blocks[0].cpl_in_use);
214
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 1638 for (blk = 1; blk < s->num_blocks; blk++) {
215 1365 AC3Block *block = &s->blocks[blk];
216 1365 put_bits(pb, 1, block->new_cpl_strategy);
217
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 1365 if (block->new_cpl_strategy)
218 ✗ put_bits(pb, 1, block->cpl_in_use);
219 }
220 }
221 /* exponent strategy */
222
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 273 if (s->use_frame_exp_strategy) {
223
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 1092 for (ch = !s->cpl_on; ch <= s->fbw_channels; ch++)
224 819 put_bits(pb, 5, s->frame_exp_strategy[ch]);
225 } else {
226 ✗ for (blk = 0; blk < s->num_blocks; blk++)
227 ✗ for (ch = !s->blocks[blk].cpl_in_use; ch <= s->fbw_channels; ch++)
228 ✗ put_bits(pb, 2, s->exp_strategy[ch][blk]);
229 }
230
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 273 if (s->lfe_on) {
231 ✗ for (blk = 0; blk < s->num_blocks; blk++)
232 ✗ put_bits(pb, 1, s->exp_strategy[s->lfe_channel][blk]);
233 }
234 /* E-AC-3 to AC-3 converter exponent strategy (not optional when num blocks == 6) */
235
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 273 if (s->num_blocks != 6) {
236 ✗ put_bits(pb, 1, 0);
237 } else {
238
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 819 for (ch = 1; ch <= s->fbw_channels; ch++) {
239
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 546 if (s->use_frame_exp_strategy)
240 546 put_bits(pb, 5, s->frame_exp_strategy[ch]);
241 else
242 ✗ put_bits(pb, 5, 0);
243 }
244 }
245 /* snr offsets */
246 273 put_bits(pb, 6, s->coarse_snr_offset);
247 273 put_bits(pb, 4, s->fine_snr_offset[1]);
248 /* block start info */
249
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 273 if (s->num_blocks > 1)
250 273 put_bits(pb, 1, 0);
251 273 }
252
253 1 static av_cold int eac3_encode_init(AVCodecContext *avctx)
254 {
255 static AVOnce init_static_once = AV_ONCE_INIT;
256 1 AC3EncodeContext *s = avctx->priv_data;
257
258 1 s->eac3 = 1;
259 1 s->output_frame_header = eac3_output_frame_header;
260
261 1 ff_thread_once(&init_static_once, eac3_exponent_init);
262
263 1 return ff_ac3_float_encode_init(avctx);
264 }
265
266 const FFCodec ff_eac3_encoder = {
267 .p.name = "eac3",
268 CODEC_LONG_NAME("ATSC A/52 E-AC-3"),
269 .p.type = AVMEDIA_TYPE_AUDIO,
270 .p.id = AV_CODEC_ID_EAC3,
271 .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE,
272 .priv_data_size = sizeof(AC3EncodeContext),
273 .init = eac3_encode_init,
274 FF_CODEC_ENCODE_CB(ff_ac3_encode_frame),
275 .close = ff_ac3_encode_close,
276 .p.sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_FLTP,
277 AV_SAMPLE_FMT_NONE },
278 .p.priv_class = &eac3enc_class,
279 .p.supported_samplerates = ff_ac3_sample_rate_tab,
280 .p.ch_layouts = ff_ac3_ch_layouts,
281 .defaults = ff_ac3_enc_defaults,
282 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
283 };
284