FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/eac3enc.c
Date: 2021-09-24 20:55:06
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 "eac3enc.h"
32 #include "eac3_data.h"
33
34
35 static const AVClass eac3enc_class = {
36 .class_name = "E-AC-3 Encoder",
37 .item_name = av_default_item_name,
38 .option = &ff_ac3_enc_options[2], /* First two options are AC-3 only. */
39 .version = LIBAVUTIL_VERSION_INT,
40 };
41
42 /**
43 * LUT for finding a matching frame exponent strategy index from a set of
44 * exponent strategies for a single channel across all 6 blocks.
45 */
46 static int8_t eac3_frame_expstr_index_tab[3][4][4][4][4][4];
47
48
49 1 av_cold void ff_eac3_exponent_init(void)
50 {
51 int i;
52
53 1 memset(eac3_frame_expstr_index_tab, -1, sizeof(eac3_frame_expstr_index_tab));
54
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33 for (i = 0; i < 32; i++) {
55 32 eac3_frame_expstr_index_tab[ff_eac3_frm_expstr[i][0]-1]
56 32 [ff_eac3_frm_expstr[i][1]]
57 32 [ff_eac3_frm_expstr[i][2]]
58 32 [ff_eac3_frm_expstr[i][3]]
59 32 [ff_eac3_frm_expstr[i][4]]
60 32 [ff_eac3_frm_expstr[i][5]] = i;
61 }
62 1 }
63
64
65 273 void ff_eac3_get_frame_exp_strategy(AC3EncodeContext *s)
66 {
67 int ch;
68
69
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273 if (s->num_blocks < 6) {
70 s->use_frame_exp_strategy = 0;
71 return;
72 }
73
74 273 s->use_frame_exp_strategy = 1;
75
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1092 for (ch = !s->cpl_on; ch <= s->fbw_channels; ch++) {
76 819 int expstr = eac3_frame_expstr_index_tab[s->exp_strategy[ch][0]-1]
77 819 [s->exp_strategy[ch][1]]
78 819 [s->exp_strategy[ch][2]]
79 819 [s->exp_strategy[ch][3]]
80 819 [s->exp_strategy[ch][4]]
81 819 [s->exp_strategy[ch][5]];
82
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819 if (expstr < 0) {
83 s->use_frame_exp_strategy = 0;
84 break;
85 }
86 819 s->frame_exp_strategy[ch] = expstr;
87 }
88 }
89
90
91
92 273 void ff_eac3_set_cpl_states(AC3EncodeContext *s)
93 {
94 int ch, blk;
95 int first_cpl_coords[AC3_MAX_CHANNELS];
96
97 /* set first cpl coords */
98
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819 for (ch = 1; ch <= s->fbw_channels; ch++)
99 546 first_cpl_coords[ch] = 1;
100
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1911 for (blk = 0; blk < s->num_blocks; blk++) {
101 1638 AC3Block *block = &s->blocks[blk];
102
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4914 for (ch = 1; ch <= s->fbw_channels; ch++) {
103
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3276 if (block->channel_in_cpl[ch]) {
104
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3276 if (first_cpl_coords[ch]) {
105 546 block->new_cpl_coords[ch] = 2;
106 546 first_cpl_coords[ch] = 0;
107 }
108 } else {
109 first_cpl_coords[ch] = 1;
110 }
111 }
112 }
113
114 /* set first cpl leak */
115
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273 for (blk = 0; blk < s->num_blocks; blk++) {
116 273 AC3Block *block = &s->blocks[blk];
117
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273 if (block->cpl_in_use) {
118 273 block->new_cpl_leak = 2;
119 273 break;
120 }
121 }
122 273 }
123
124
125 273 void ff_eac3_output_frame_header(AC3EncodeContext *s)
126 {
127 int blk, ch;
128 273 AC3EncOptions *opt = &s->options;
129
130 273 put_bits(&s->pb, 16, 0x0b77); /* sync word */
131
132 /* BSI header */
133 273 put_bits(&s->pb, 2, 0); /* stream type = independent */
134 273 put_bits(&s->pb, 3, 0); /* substream id = 0 */
135 273 put_bits(&s->pb, 11, (s->frame_size / 2) - 1); /* frame size */
136
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273 if (s->bit_alloc.sr_shift) {
137 put_bits(&s->pb, 2, 0x3); /* fscod2 */
138 put_bits(&s->pb, 2, s->bit_alloc.sr_code); /* sample rate code */
139 } else {
140 273 put_bits(&s->pb, 2, s->bit_alloc.sr_code); /* sample rate code */
141 273 put_bits(&s->pb, 2, s->num_blks_code); /* number of blocks */
142 }
143 273 put_bits(&s->pb, 3, s->channel_mode); /* audio coding mode */
144 273 put_bits(&s->pb, 1, s->lfe_on); /* LFE channel indicator */
145 273 put_bits(&s->pb, 5, s->bitstream_id); /* bitstream id (EAC3=16) */
146 273 put_bits(&s->pb, 5, -opt->dialogue_level); /* dialogue normalization level */
147 273 put_bits(&s->pb, 1, 0); /* no compression gain */
148 /* mixing metadata*/
149 273 put_bits(&s->pb, 1, opt->eac3_mixing_metadata);
150
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273 if (opt->eac3_mixing_metadata) {
151 if (s->channel_mode > AC3_CHMODE_STEREO)
152 put_bits(&s->pb, 2, opt->preferred_stereo_downmix);
153 if (s->has_center) {
154 put_bits(&s->pb, 3, s->ltrt_center_mix_level);
155 put_bits(&s->pb, 3, s->loro_center_mix_level);
156 }
157 if (s->has_surround) {
158 put_bits(&s->pb, 3, s->ltrt_surround_mix_level);
159 put_bits(&s->pb, 3, s->loro_surround_mix_level);
160 }
161 if (s->lfe_on)
162 put_bits(&s->pb, 1, 0);
163 put_bits(&s->pb, 1, 0); /* no program scale */
164 put_bits(&s->pb, 1, 0); /* no ext program scale */
165 put_bits(&s->pb, 2, 0); /* no mixing parameters */
166 if (s->channel_mode < AC3_CHMODE_STEREO)
167 put_bits(&s->pb, 1, 0); /* no pan info */
168 put_bits(&s->pb, 1, 0); /* no frame mix config info */
169 }
170 /* info metadata*/
171 273 put_bits(&s->pb, 1, opt->eac3_info_metadata);
172
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273 if (opt->eac3_info_metadata) {
173 put_bits(&s->pb, 3, s->bitstream_mode);
174 put_bits(&s->pb, 1, opt->copyright);
175 put_bits(&s->pb, 1, opt->original);
176 if (s->channel_mode == AC3_CHMODE_STEREO) {
177 put_bits(&s->pb, 2, opt->dolby_surround_mode);
178 put_bits(&s->pb, 2, opt->dolby_headphone_mode);
179 }
180 if (s->channel_mode >= AC3_CHMODE_2F2R)
181 put_bits(&s->pb, 2, opt->dolby_surround_ex_mode);
182 put_bits(&s->pb, 1, opt->audio_production_info);
183 if (opt->audio_production_info) {
184 put_bits(&s->pb, 5, opt->mixing_level - 80);
185 put_bits(&s->pb, 2, opt->room_type);
186 put_bits(&s->pb, 1, opt->ad_converter_type);
187 }
188 put_bits(&s->pb, 1, 0);
189 }
190
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273 if (s->num_blocks != 6)
191 put_bits(&s->pb, 1, !(s->avctx->frame_number % 6)); /* converter sync flag */
192 273 put_bits(&s->pb, 1, 0); /* no additional bit stream info */
193
194 /* frame header */
195
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273 if (s->num_blocks == 6) {
196 273 put_bits(&s->pb, 1, !s->use_frame_exp_strategy); /* exponent strategy syntax */
197 273 put_bits(&s->pb, 1, 0); /* aht enabled = no */
198 }
199 273 put_bits(&s->pb, 2, 0); /* snr offset strategy = 1 */
200 273 put_bits(&s->pb, 1, 0); /* transient pre-noise processing enabled = no */
201 273 put_bits(&s->pb, 1, 0); /* block switch syntax enabled = no */
202 273 put_bits(&s->pb, 1, 0); /* dither flag syntax enabled = no */
203 273 put_bits(&s->pb, 1, 0); /* bit allocation model syntax enabled = no */
204 273 put_bits(&s->pb, 1, 0); /* fast gain codes enabled = no */
205 273 put_bits(&s->pb, 1, 0); /* dba syntax enabled = no */
206 273 put_bits(&s->pb, 1, 0); /* skip field syntax enabled = no */
207 273 put_bits(&s->pb, 1, 0); /* spx enabled = no */
208 /* coupling strategy use flags */
209
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273 if (s->channel_mode > AC3_CHMODE_MONO) {
210 273 put_bits(&s->pb, 1, s->blocks[0].cpl_in_use);
211
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1638 for (blk = 1; blk < s->num_blocks; blk++) {
212 1365 AC3Block *block = &s->blocks[blk];
213 1365 put_bits(&s->pb, 1, block->new_cpl_strategy);
214
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1365 if (block->new_cpl_strategy)
215 put_bits(&s->pb, 1, block->cpl_in_use);
216 }
217 }
218 /* exponent strategy */
219
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273 if (s->use_frame_exp_strategy) {
220
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1092 for (ch = !s->cpl_on; ch <= s->fbw_channels; ch++)
221 819 put_bits(&s->pb, 5, s->frame_exp_strategy[ch]);
222 } else {
223 for (blk = 0; blk < s->num_blocks; blk++)
224 for (ch = !s->blocks[blk].cpl_in_use; ch <= s->fbw_channels; ch++)
225 put_bits(&s->pb, 2, s->exp_strategy[ch][blk]);
226 }
227
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273 if (s->lfe_on) {
228 for (blk = 0; blk < s->num_blocks; blk++)
229 put_bits(&s->pb, 1, s->exp_strategy[s->lfe_channel][blk]);
230 }
231 /* E-AC-3 to AC-3 converter exponent strategy (not optional when num blocks == 6) */
232
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273 if (s->num_blocks != 6) {
233 put_bits(&s->pb, 1, 0);
234 } else {
235
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819 for (ch = 1; ch <= s->fbw_channels; ch++) {
236
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546 if (s->use_frame_exp_strategy)
237 546 put_bits(&s->pb, 5, s->frame_exp_strategy[ch]);
238 else
239 put_bits(&s->pb, 5, 0);
240 }
241 }
242 /* snr offsets */
243 273 put_bits(&s->pb, 6, s->coarse_snr_offset);
244 273 put_bits(&s->pb, 4, s->fine_snr_offset[1]);
245 /* block start info */
246
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273 if (s->num_blocks > 1)
247 273 put_bits(&s->pb, 1, 0);
248 273 }
249
250
251 const AVCodec ff_eac3_encoder = {
252 .name = "eac3",
253 .long_name = NULL_IF_CONFIG_SMALL("ATSC A/52 E-AC-3"),
254 .type = AVMEDIA_TYPE_AUDIO,
255 .id = AV_CODEC_ID_EAC3,
256 .capabilities = AV_CODEC_CAP_DR1,
257 .priv_data_size = sizeof(AC3EncodeContext),
258 .init = ff_ac3_float_encode_init,
259 .encode2 = ff_ac3_float_encode_frame,
260 .close = ff_ac3_encode_close,
261 .sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_FLTP,
262 AV_SAMPLE_FMT_NONE },
263 .priv_class = &eac3enc_class,
264 .supported_samplerates = ff_ac3_sample_rate_tab,
265 .channel_layouts = ff_ac3_channel_layouts,
266 .defaults = ff_ac3_enc_defaults,
267 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP,
268 };
269