Directory: | ../../../ffmpeg/ |
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File: | src/libavcodec/eac3enc.c |
Date: | 2022-07-04 19:11:22 |
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Lines: | 89 | 135 | 65.9% |
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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 |