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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 CONFIG_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 | #define AC3ENC_TYPE AC3ENC_TYPE_EAC3 | |
36 | #include "ac3enc_opts_template.c" | |
37 | ||
38 | static const AVClass eac3enc_class = { | |
39 | .class_name = "E-AC-3 Encoder", | |
40 | .item_name = av_default_item_name, | |
41 | .option = ac3_options, | |
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 | av_cold void ff_eac3_exponent_init(void) | |
53 | { | |
54 | int i; | |
55 | ||
56 | memset(eac3_frame_expstr_index_tab, -1, sizeof(eac3_frame_expstr_index_tab)); | |
57 | for (i = 0; i < 32; i++) { | |
58 | eac3_frame_expstr_index_tab[ff_eac3_frm_expstr[i][0]-1] | |
59 | [ff_eac3_frm_expstr[i][1]] | |
60 | [ff_eac3_frm_expstr[i][2]] | |
61 | [ff_eac3_frm_expstr[i][3]] | |
62 | [ff_eac3_frm_expstr[i][4]] | |
63 | [ff_eac3_frm_expstr[i][5]] = i; | |
64 | } | |
65 | } | |
66 | ||
67 | ||
68 | void ff_eac3_get_frame_exp_strategy(AC3EncodeContext *s) | |
69 | { | |
70 | int ch; | |
71 | ||
72 | if (s->num_blocks < 6) { | |
73 | s->use_frame_exp_strategy = 0; | |
74 | return; | |
75 | } | |
76 | ||
77 | s->use_frame_exp_strategy = 1; | |
78 | for (ch = !s->cpl_on; ch <= s->fbw_channels; ch++) { | |
79 | int expstr = eac3_frame_expstr_index_tab[s->exp_strategy[ch][0]-1] | |
80 | [s->exp_strategy[ch][1]] | |
81 | [s->exp_strategy[ch][2]] | |
82 | [s->exp_strategy[ch][3]] | |
83 | [s->exp_strategy[ch][4]] | |
84 | [s->exp_strategy[ch][5]]; | |
85 | if (expstr < 0) { | |
86 | s->use_frame_exp_strategy = 0; | |
87 | break; | |
88 | } | |
89 | s->frame_exp_strategy[ch] = expstr; | |
90 | } | |
91 | } | |
92 | ||
93 | ||
94 | ||
95 | void ff_eac3_set_cpl_states(AC3EncodeContext *s) | |
96 | { | |
97 | int ch, blk; | |
98 | int first_cpl_coords[AC3_MAX_CHANNELS]; | |
99 | ||
100 | /* set first cpl coords */ | |
101 | for (ch = 1; ch <= s->fbw_channels; ch++) | |
102 | first_cpl_coords[ch] = 1; | |
103 | for (blk = 0; blk < s->num_blocks; blk++) { | |
104 | AC3Block *block = &s->blocks[blk]; | |
105 | for (ch = 1; ch <= s->fbw_channels; ch++) { | |
106 | if (block->channel_in_cpl[ch]) { | |
107 | if (first_cpl_coords[ch]) { | |
108 | block->new_cpl_coords[ch] = 2; | |
109 | first_cpl_coords[ch] = 0; | |
110 | } | |
111 | } else { | |
112 | first_cpl_coords[ch] = 1; | |
113 | } | |
114 | } | |
115 | } | |
116 | ||
117 | /* set first cpl leak */ | |
118 | for (blk = 0; blk < s->num_blocks; blk++) { | |
119 | AC3Block *block = &s->blocks[blk]; | |
120 | if (block->cpl_in_use) { | |
121 | block->new_cpl_leak = 2; | |
122 | break; | |
123 | } | |
124 | } | |
125 | } | |
126 | ||
127 | ||
128 | void ff_eac3_output_frame_header(AC3EncodeContext *s) | |
129 | { | |
130 | int blk, ch; | |
131 | AC3EncOptions *opt = &s->options; | |
132 | ||
133 | put_bits(&s->pb, 16, 0x0b77); /* sync word */ | |
134 | ||
135 | /* BSI header */ | |
136 | put_bits(&s->pb, 2, 0); /* stream type = independent */ | |
137 | put_bits(&s->pb, 3, 0); /* substream id = 0 */ | |
138 | put_bits(&s->pb, 11, (s->frame_size / 2) - 1); /* frame size */ | |
139 | if (s->bit_alloc.sr_shift) { | |
140 | put_bits(&s->pb, 2, 0x3); /* fscod2 */ | |
141 | put_bits(&s->pb, 2, s->bit_alloc.sr_code); /* sample rate code */ | |
142 | } else { | |
143 | put_bits(&s->pb, 2, s->bit_alloc.sr_code); /* sample rate code */ | |
144 | put_bits(&s->pb, 2, s->num_blks_code); /* number of blocks */ | |
145 | } | |
146 | put_bits(&s->pb, 3, s->channel_mode); /* audio coding mode */ | |
147 | put_bits(&s->pb, 1, s->lfe_on); /* LFE channel indicator */ | |
148 | put_bits(&s->pb, 5, s->bitstream_id); /* bitstream id (EAC3=16) */ | |
149 | put_bits(&s->pb, 5, -opt->dialogue_level); /* dialogue normalization level */ | |
150 | put_bits(&s->pb, 1, 0); /* no compression gain */ | |
151 | /* mixing metadata*/ | |
152 | put_bits(&s->pb, 1, opt->eac3_mixing_metadata); | |
153 | if (opt->eac3_mixing_metadata) { | |
154 | if (s->channel_mode > AC3_CHMODE_STEREO) | |
155 | put_bits(&s->pb, 2, opt->preferred_stereo_downmix); | |
156 | if (s->has_center) { | |
157 | put_bits(&s->pb, 3, s->ltrt_center_mix_level); | |
158 | put_bits(&s->pb, 3, s->loro_center_mix_level); | |
159 | } | |
160 | if (s->has_surround) { | |
161 | put_bits(&s->pb, 3, s->ltrt_surround_mix_level); | |
162 | put_bits(&s->pb, 3, s->loro_surround_mix_level); | |
163 | } | |
164 | if (s->lfe_on) | |
165 | put_bits(&s->pb, 1, 0); | |
166 | put_bits(&s->pb, 1, 0); /* no program scale */ | |
167 | put_bits(&s->pb, 1, 0); /* no ext program scale */ | |
168 | put_bits(&s->pb, 2, 0); /* no mixing parameters */ | |
169 | if (s->channel_mode < AC3_CHMODE_STEREO) | |
170 | put_bits(&s->pb, 1, 0); /* no pan info */ | |
171 | put_bits(&s->pb, 1, 0); /* no frame mix config info */ | |
172 | } | |
173 | /* info metadata*/ | |
174 | put_bits(&s->pb, 1, opt->eac3_info_metadata); | |
175 | if (opt->eac3_info_metadata) { | |
176 | put_bits(&s->pb, 3, s->bitstream_mode); | |
177 | put_bits(&s->pb, 1, opt->copyright); | |
178 | put_bits(&s->pb, 1, opt->original); | |
179 | if (s->channel_mode == AC3_CHMODE_STEREO) { | |
180 | put_bits(&s->pb, 2, opt->dolby_surround_mode); | |
181 | put_bits(&s->pb, 2, opt->dolby_headphone_mode); | |
182 | } | |
183 | if (s->channel_mode >= AC3_CHMODE_2F2R) | |
184 | put_bits(&s->pb, 2, opt->dolby_surround_ex_mode); | |
185 | put_bits(&s->pb, 1, opt->audio_production_info); | |
186 | if (opt->audio_production_info) { | |
187 | put_bits(&s->pb, 5, opt->mixing_level - 80); | |
188 | put_bits(&s->pb, 2, opt->room_type); | |
189 | put_bits(&s->pb, 1, opt->ad_converter_type); | |
190 | } | |
191 | put_bits(&s->pb, 1, 0); | |
192 | } | |
193 | if (s->num_blocks != 6) | |
194 | put_bits(&s->pb, 1, !(s->avctx->frame_number % 6)); /* converter sync flag */ | |
195 | put_bits(&s->pb, 1, 0); /* no additional bit stream info */ | |
196 | ||
197 | /* frame header */ | |
198 | if (s->num_blocks == 6) { | |
199 | put_bits(&s->pb, 1, !s->use_frame_exp_strategy);/* exponent strategy syntax */ | |
200 | put_bits(&s->pb, 1, 0); /* aht enabled = no */ | |
201 | } | |
202 | put_bits(&s->pb, 2, 0); /* snr offset strategy = 1 */ | |
203 | put_bits(&s->pb, 1, 0); /* transient pre-noise processing enabled = no */ | |
204 | put_bits(&s->pb, 1, 0); /* block switch syntax enabled = no */ | |
205 | put_bits(&s->pb, 1, 0); /* dither flag syntax enabled = no */ | |
206 | put_bits(&s->pb, 1, 0); /* bit allocation model syntax enabled = no */ | |
207 | put_bits(&s->pb, 1, 0); /* fast gain codes enabled = no */ | |
208 | put_bits(&s->pb, 1, 0); /* dba syntax enabled = no */ | |
209 | put_bits(&s->pb, 1, 0); /* skip field syntax enabled = no */ | |
210 | put_bits(&s->pb, 1, 0); /* spx enabled = no */ | |
211 | /* coupling strategy use flags */ | |
212 | if (s->channel_mode > AC3_CHMODE_MONO) { | |
213 | put_bits(&s->pb, 1, s->blocks[0].cpl_in_use); | |
214 | for (blk = 1; blk < s->num_blocks; blk++) { | |
215 | AC3Block *block = &s->blocks[blk]; | |
216 | put_bits(&s->pb, 1, block->new_cpl_strategy); | |
217 | if (block->new_cpl_strategy) | |
218 | put_bits(&s->pb, 1, block->cpl_in_use); | |
219 | } | |
220 | } | |
221 | /* exponent strategy */ | |
222 | if (s->use_frame_exp_strategy) { | |
223 | for (ch = !s->cpl_on; ch <= s->fbw_channels; ch++) | |
224 | put_bits(&s->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(&s->pb, 2, s->exp_strategy[ch][blk]); | |
229 | } | |
230 | if (s->lfe_on) { | |
231 | for (blk = 0; blk < s->num_blocks; blk++) | |
232 | put_bits(&s->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 | if (s->num_blocks != 6) { | |
236 | put_bits(&s->pb, 1, 0); | |
237 | } else { | |
238 | for (ch = 1; ch <= s->fbw_channels; ch++) { | |
239 | if (s->use_frame_exp_strategy) | |
240 | put_bits(&s->pb, 5, s->frame_exp_strategy[ch]); | |
241 | else | |
242 | put_bits(&s->pb, 5, 0); | |
243 | } | |
244 | } | |
245 | /* snr offsets */ | |
246 | put_bits(&s->pb, 6, s->coarse_snr_offset); | |
247 | put_bits(&s->pb, 4, s->fine_snr_offset[1]); | |
248 | /* block start info */ | |
249 | if (s->num_blocks > 1) | |
250 | put_bits(&s->pb, 1, 0); | |
251 | } | |
252 | ||
253 | ||
254 | AVCodec ff_eac3_encoder = { | |
255 | .name = "eac3", | |
256 | .long_name = NULL_IF_CONFIG_SMALL("ATSC A/52 E-AC-3"), | |
257 | .type = AVMEDIA_TYPE_AUDIO, | |
258 | .id = AV_CODEC_ID_EAC3, | |
259 | .priv_data_size = sizeof(AC3EncodeContext), | |
260 | .init = ff_ac3_float_encode_init, | |
261 | .encode2 = ff_ac3_float_encode_frame, | |
262 | .close = ff_ac3_encode_close, | |
263 | .sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_FLTP, | |
264 | AV_SAMPLE_FMT_NONE }, | |
265 | .priv_class = &eac3enc_class, | |
266 | .channel_layouts = ff_ac3_channel_layouts, | |
267 | .defaults = ac3_defaults, | |
268 | }; |