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1 | /* |
2 | * The simplest AC-3 encoder | |
3 | * Copyright (c) 2000 Fabrice Bellard | |
4 | * Copyright (c) 2006-2010 Justin Ruggles <justin.ruggles@gmail.com> | |
5 | * Copyright (c) 2006-2010 Prakash Punnoor <prakash@punnoor.de> | |
6 | * | |
7 | * This file is part of FFmpeg. | |
8 | * | |
9 | * FFmpeg is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU Lesser General Public | |
11 | * License as published by the Free Software Foundation; either | |
12 | * version 2.1 of the License, or (at your option) any later version. | |
13 | * | |
14 | * FFmpeg is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
17 | * Lesser General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU Lesser General Public | |
20 | * License along with FFmpeg; if not, write to the Free Software | |
21 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
22 | */ | |
23 | ||
24 | /** | |
25 | * @file | |
26 | * The simplest AC-3 encoder. | |
27 | */ | |
28 | ||
29 | #include <stdint.h> | |
30 | ||
31 | #include "libavutil/attributes.h" | |
32 | #include "libavutil/avassert.h" | |
33 | #include "libavutil/avstring.h" | |
34 | #include "libavutil/channel_layout.h" | |
35 | #include "libavutil/crc.h" | |
36 | #include "libavutil/internal.h" | |
37 | #include "libavutil/opt.h" | |
38 | #include "avcodec.h" | |
39 | #include "me_cmp.h" | |
40 | #include "put_bits.h" | |
41 | #include "audiodsp.h" | |
42 | #include "ac3dsp.h" | |
43 | #include "ac3.h" | |
44 | #include "fft.h" | |
45 | #include "ac3enc.h" | |
46 | #include "eac3enc.h" | |
47 | ||
48 | typedef struct AC3Mant { | |
49 | int16_t *qmant1_ptr, *qmant2_ptr, *qmant4_ptr; ///< mantissa pointers for bap=1,2,4 | |
50 | int mant1_cnt, mant2_cnt, mant4_cnt; ///< mantissa counts for bap=1,2,4 | |
51 | } AC3Mant; | |
52 | ||
53 | #define CMIXLEV_NUM_OPTIONS 3 | |
54 | static const float cmixlev_options[CMIXLEV_NUM_OPTIONS] = { | |
55 | LEVEL_MINUS_3DB, LEVEL_MINUS_4POINT5DB, LEVEL_MINUS_6DB | |
56 | }; | |
57 | ||
58 | #define SURMIXLEV_NUM_OPTIONS 3 | |
59 | static const float surmixlev_options[SURMIXLEV_NUM_OPTIONS] = { | |
60 | LEVEL_MINUS_3DB, LEVEL_MINUS_6DB, LEVEL_ZERO | |
61 | }; | |
62 | ||
63 | #define EXTMIXLEV_NUM_OPTIONS 8 | |
64 | static const float extmixlev_options[EXTMIXLEV_NUM_OPTIONS] = { | |
65 | LEVEL_PLUS_3DB, LEVEL_PLUS_1POINT5DB, LEVEL_ONE, LEVEL_MINUS_4POINT5DB, | |
66 | LEVEL_MINUS_3DB, LEVEL_MINUS_4POINT5DB, LEVEL_MINUS_6DB, LEVEL_ZERO | |
67 | }; | |
68 | ||
69 | ||
70 | /** | |
71 | * LUT for number of exponent groups. | |
72 | * exponent_group_tab[coupling][exponent strategy-1][number of coefficients] | |
73 | */ | |
74 | static uint8_t exponent_group_tab[2][3][256]; | |
75 | ||
76 | ||
77 | /** | |
78 | * List of supported channel layouts. | |
79 | */ | |
80 | const uint64_t ff_ac3_channel_layouts[19] = { | |
81 | AV_CH_LAYOUT_MONO, | |
82 | AV_CH_LAYOUT_STEREO, | |
83 | AV_CH_LAYOUT_2_1, | |
84 | AV_CH_LAYOUT_SURROUND, | |
85 | AV_CH_LAYOUT_2_2, | |
86 | AV_CH_LAYOUT_QUAD, | |
87 | AV_CH_LAYOUT_4POINT0, | |
88 | AV_CH_LAYOUT_5POINT0, | |
89 | AV_CH_LAYOUT_5POINT0_BACK, | |
90 | (AV_CH_LAYOUT_MONO | AV_CH_LOW_FREQUENCY), | |
91 | (AV_CH_LAYOUT_STEREO | AV_CH_LOW_FREQUENCY), | |
92 | (AV_CH_LAYOUT_2_1 | AV_CH_LOW_FREQUENCY), | |
93 | (AV_CH_LAYOUT_SURROUND | AV_CH_LOW_FREQUENCY), | |
94 | (AV_CH_LAYOUT_2_2 | AV_CH_LOW_FREQUENCY), | |
95 | (AV_CH_LAYOUT_QUAD | AV_CH_LOW_FREQUENCY), | |
96 | (AV_CH_LAYOUT_4POINT0 | AV_CH_LOW_FREQUENCY), | |
97 | AV_CH_LAYOUT_5POINT1, | |
98 | AV_CH_LAYOUT_5POINT1_BACK, | |
99 | 0 | |
100 | }; | |
101 | ||
102 | ||
103 | /** | |
104 | * LUT to select the bandwidth code based on the bit rate, sample rate, and | |
105 | * number of full-bandwidth channels. | |
106 | * bandwidth_tab[fbw_channels-1][sample rate code][bit rate code] | |
107 | */ | |
108 | static const uint8_t ac3_bandwidth_tab[5][3][19] = { | |
109 | // 32 40 48 56 64 80 96 112 128 160 192 224 256 320 384 448 512 576 640 | |
110 | ||
111 | { { 0, 0, 0, 12, 16, 32, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48 }, | |
112 | { 0, 0, 0, 16, 20, 36, 56, 56, 56, 56, 56, 56, 56, 56, 56, 56, 56, 56, 56 }, | |
113 | { 0, 0, 0, 32, 40, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60 } }, | |
114 | ||
115 | { { 0, 0, 0, 0, 0, 0, 0, 20, 24, 32, 48, 48, 48, 48, 48, 48, 48, 48, 48 }, | |
116 | { 0, 0, 0, 0, 0, 0, 4, 24, 28, 36, 56, 56, 56, 56, 56, 56, 56, 56, 56 }, | |
117 | { 0, 0, 0, 0, 0, 0, 20, 44, 52, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60 } }, | |
118 | ||
119 | { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 16, 24, 32, 40, 48, 48, 48, 48, 48, 48 }, | |
120 | { 0, 0, 0, 0, 0, 0, 0, 0, 4, 20, 28, 36, 44, 56, 56, 56, 56, 56, 56 }, | |
121 | { 0, 0, 0, 0, 0, 0, 0, 0, 20, 40, 48, 60, 60, 60, 60, 60, 60, 60, 60 } }, | |
122 | ||
123 | { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 12, 24, 32, 48, 48, 48, 48, 48, 48 }, | |
124 | { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 16, 28, 36, 56, 56, 56, 56, 56, 56 }, | |
125 | { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 32, 48, 60, 60, 60, 60, 60, 60, 60 } }, | |
126 | ||
127 | { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 8, 20, 32, 40, 48, 48, 48, 48 }, | |
128 | { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 12, 24, 36, 44, 56, 56, 56, 56 }, | |
129 | { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 28, 44, 60, 60, 60, 60, 60, 60 } } | |
130 | }; | |
131 | ||
132 | ||
133 | /** | |
134 | * LUT to select the coupling start band based on the bit rate, sample rate, and | |
135 | * number of full-bandwidth channels. -1 = coupling off | |
136 | * ac3_coupling_start_tab[channel_mode-2][sample rate code][bit rate code] | |
137 | * | |
138 | * TODO: more testing for optimal parameters. | |
139 | * multi-channel tests at 44.1kHz and 32kHz. | |
140 | */ | |
141 | static const int8_t ac3_coupling_start_tab[6][3][19] = { | |
142 | // 32 40 48 56 64 80 96 112 128 160 192 224 256 320 384 448 512 576 640 | |
143 | ||
144 | // 2/0 | |
145 | { { 0, 0, 0, 0, 0, 0, 0, 1, 1, 7, 8, 11, 12, -1, -1, -1, -1, -1, -1 }, | |
146 | { 0, 0, 0, 0, 0, 0, 1, 3, 5, 7, 10, 12, 13, -1, -1, -1, -1, -1, -1 }, | |
147 | { 0, 0, 0, 0, 1, 2, 2, 9, 13, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1 } }, | |
148 | ||
149 | // 3/0 | |
150 | { { 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 6, 9, 11, 12, 13, -1, -1, -1, -1 }, | |
151 | { 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 6, 9, 11, 12, 13, -1, -1, -1, -1 }, | |
152 | { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 } }, | |
153 | ||
154 | // 2/1 - untested | |
155 | { { 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 6, 9, 11, 12, 13, -1, -1, -1, -1 }, | |
156 | { 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 6, 9, 11, 12, 13, -1, -1, -1, -1 }, | |
157 | { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 } }, | |
158 | ||
159 | // 3/1 | |
160 | { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 2, 10, 11, 11, 12, 12, 14, -1 }, | |
161 | { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 2, 10, 11, 11, 12, 12, 14, -1 }, | |
162 | { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 } }, | |
163 | ||
164 | // 2/2 - untested | |
165 | { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 2, 10, 11, 11, 12, 12, 14, -1 }, | |
166 | { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 2, 10, 11, 11, 12, 12, 14, -1 }, | |
167 | { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 } }, | |
168 | ||
169 | // 3/2 | |
170 | { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 6, 8, 11, 12, 12, -1, -1 }, | |
171 | { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 6, 8, 11, 12, 12, -1, -1 }, | |
172 | { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 } }, | |
173 | }; | |
174 | ||
175 | ||
176 | /** | |
177 | * Adjust the frame size to make the average bit rate match the target bit rate. | |
178 | * This is only needed for 11025, 22050, and 44100 sample rates or any E-AC-3. | |
179 | * | |
180 | * @param s AC-3 encoder private context | |
181 | */ | |
182 | void ff_ac3_adjust_frame_size(AC3EncodeContext *s) | |
183 | { | |
184 | while (s->bits_written >= s->bit_rate && s->samples_written >= s->sample_rate) { | |
185 | s->bits_written -= s->bit_rate; | |
186 | s->samples_written -= s->sample_rate; | |
187 | } | |
188 | s->frame_size = s->frame_size_min + | |
189 | 2 * (s->bits_written * s->sample_rate < s->samples_written * s->bit_rate); | |
190 | s->bits_written += s->frame_size * 8; | |
191 | s->samples_written += AC3_BLOCK_SIZE * s->num_blocks; | |
192 | } | |
193 | ||
194 | ||
195 | /** | |
196 | * Set the initial coupling strategy parameters prior to coupling analysis. | |
197 | * | |
198 | * @param s AC-3 encoder private context | |
199 | */ | |
200 | void ff_ac3_compute_coupling_strategy(AC3EncodeContext *s) | |
201 | { | |
202 | int blk, ch; | |
203 | int got_cpl_snr; | |
204 | int num_cpl_blocks; | |
205 | ||
206 | /* set coupling use flags for each block/channel */ | |
207 | /* TODO: turn coupling on/off and adjust start band based on bit usage */ | |
208 | for (blk = 0; blk < s->num_blocks; blk++) { | |
209 | AC3Block *block = &s->blocks[blk]; | |
210 | for (ch = 1; ch <= s->fbw_channels; ch++) | |
211 | block->channel_in_cpl[ch] = s->cpl_on; | |
212 | } | |
213 | ||
214 | /* enable coupling for each block if at least 2 channels have coupling | |
215 | enabled for that block */ | |
216 | got_cpl_snr = 0; | |
217 | num_cpl_blocks = 0; | |
218 | for (blk = 0; blk < s->num_blocks; blk++) { | |
219 | AC3Block *block = &s->blocks[blk]; | |
220 | block->num_cpl_channels = 0; | |
221 | for (ch = 1; ch <= s->fbw_channels; ch++) | |
222 | block->num_cpl_channels += block->channel_in_cpl[ch]; | |
223 | block->cpl_in_use = block->num_cpl_channels > 1; | |
224 | num_cpl_blocks += block->cpl_in_use; | |
225 | if (!block->cpl_in_use) { | |
226 | block->num_cpl_channels = 0; | |
227 | for (ch = 1; ch <= s->fbw_channels; ch++) | |
228 | block->channel_in_cpl[ch] = 0; | |
229 | } | |
230 | ||
231 | block->new_cpl_strategy = !blk; | |
232 | if (blk) { | |
233 | for (ch = 1; ch <= s->fbw_channels; ch++) { | |
234 | if (block->channel_in_cpl[ch] != s->blocks[blk-1].channel_in_cpl[ch]) { | |
235 | block->new_cpl_strategy = 1; | |
236 | break; | |
237 | } | |
238 | } | |
239 | } | |
240 | block->new_cpl_leak = block->new_cpl_strategy; | |
241 | ||
242 | if (!blk || (block->cpl_in_use && !got_cpl_snr)) { | |
243 | block->new_snr_offsets = 1; | |
244 | if (block->cpl_in_use) | |
245 | got_cpl_snr = 1; | |
246 | } else { | |
247 | block->new_snr_offsets = 0; | |
248 | } | |
249 | } | |
250 | if (!num_cpl_blocks) | |
251 | s->cpl_on = 0; | |
252 | ||
253 | /* set bandwidth for each channel */ | |
254 | for (blk = 0; blk < s->num_blocks; blk++) { | |
255 | AC3Block *block = &s->blocks[blk]; | |
256 | for (ch = 1; ch <= s->fbw_channels; ch++) { | |
257 | if (block->channel_in_cpl[ch]) | |
258 | block->end_freq[ch] = s->start_freq[CPL_CH]; | |
259 | else | |
260 | block->end_freq[ch] = s->bandwidth_code * 3 + 73; | |
261 | } | |
262 | } | |
263 | } | |
264 | ||
265 | ||
266 | /** | |
267 | * Apply stereo rematrixing to coefficients based on rematrixing flags. | |
268 | * | |
269 | * @param s AC-3 encoder private context | |
270 | */ | |
271 | void ff_ac3_apply_rematrixing(AC3EncodeContext *s) | |
272 | { | |
273 | int nb_coefs; | |
274 | int blk, bnd, i; | |
275 | int start, end; | |
276 | uint8_t *flags = NULL; | |
277 | ||
278 | if (!s->rematrixing_enabled) | |
279 | return; | |
280 | ||
281 | for (blk = 0; blk < s->num_blocks; blk++) { | |
282 | AC3Block *block = &s->blocks[blk]; | |
283 | if (block->new_rematrixing_strategy) | |
284 | flags = block->rematrixing_flags; | |
285 | nb_coefs = FFMIN(block->end_freq[1], block->end_freq[2]); | |
286 | for (bnd = 0; bnd < block->num_rematrixing_bands; bnd++) { | |
287 | if (flags[bnd]) { | |
288 | start = ff_ac3_rematrix_band_tab[bnd]; | |
289 | end = FFMIN(nb_coefs, ff_ac3_rematrix_band_tab[bnd+1]); | |
290 | for (i = start; i < end; i++) { | |
291 | int32_t lt = block->fixed_coef[1][i]; | |
292 | int32_t rt = block->fixed_coef[2][i]; | |
293 | block->fixed_coef[1][i] = (lt + rt) >> 1; | |
294 | block->fixed_coef[2][i] = (lt - rt) >> 1; | |
295 | } | |
296 | } | |
297 | } | |
298 | } | |
299 | } | |
300 | ||
301 | ||
302 | /* | |
303 | * Initialize exponent tables. | |
304 | */ | |
305 | static av_cold void exponent_init(AC3EncodeContext *s) | |
306 | { | |
307 | int expstr, i, grpsize; | |
308 | ||
309 | for (expstr = EXP_D15-1; expstr <= EXP_D45-1; expstr++) { | |
310 | grpsize = 3 << expstr; | |
311 | for (i = 12; i < 256; i++) { | |
312 | exponent_group_tab[0][expstr][i] = (i + grpsize - 4) / grpsize; | |
313 | exponent_group_tab[1][expstr][i] = (i ) / grpsize; | |
314 | } | |
315 | } | |
316 | /* LFE */ | |
317 | exponent_group_tab[0][0][7] = 2; | |
318 | ||
319 | if (CONFIG_EAC3_ENCODER && s->eac3) | |
320 | ff_eac3_exponent_init(); | |
321 | } | |
322 | ||
323 | ||
324 | /* | |
325 | * Extract exponents from the MDCT coefficients. | |
326 | */ | |
327 | static void extract_exponents(AC3EncodeContext *s) | |
328 | { | |
329 | int ch = !s->cpl_on; | |
330 | int chan_size = AC3_MAX_COEFS * s->num_blocks * (s->channels - ch + 1); | |
331 | AC3Block *block = &s->blocks[0]; | |
332 | ||
333 | s->ac3dsp.extract_exponents(block->exp[ch], block->fixed_coef[ch], chan_size); | |
334 | } | |
335 | ||
336 | ||
337 | /** | |
338 | * Exponent Difference Threshold. | |
339 | * New exponents are sent if their SAD exceed this number. | |
340 | */ | |
341 | #define EXP_DIFF_THRESHOLD 500 | |
342 | ||
343 | /** | |
344 | * Table used to select exponent strategy based on exponent reuse block interval. | |
345 | */ | |
346 | static const uint8_t exp_strategy_reuse_tab[4][6] = { | |
347 | { EXP_D15, EXP_D15, EXP_D15, EXP_D15, EXP_D15, EXP_D15 }, | |
348 | { EXP_D15, EXP_D15, EXP_D15, EXP_D15, EXP_D15, EXP_D15 }, | |
349 | { EXP_D25, EXP_D25, EXP_D15, EXP_D15, EXP_D15, EXP_D15 }, | |
350 | { EXP_D45, EXP_D25, EXP_D25, EXP_D15, EXP_D15, EXP_D15 } | |
351 | }; | |
352 | ||
353 | /* | |
354 | * Calculate exponent strategies for all channels. | |
355 | * Array arrangement is reversed to simplify the per-channel calculation. | |
356 | */ | |
357 | static void compute_exp_strategy(AC3EncodeContext *s) | |
358 | { | |
359 | int ch, blk, blk1; | |
360 | ||
361 | for (ch = !s->cpl_on; ch <= s->fbw_channels; ch++) { | |
362 | uint8_t *exp_strategy = s->exp_strategy[ch]; | |
363 | uint8_t *exp = s->blocks[0].exp[ch]; | |
364 | int exp_diff; | |
365 | ||
366 | /* estimate if the exponent variation & decide if they should be | |
367 | reused in the next frame */ | |
368 | exp_strategy[0] = EXP_NEW; | |
369 | exp += AC3_MAX_COEFS; | |
370 | for (blk = 1; blk < s->num_blocks; blk++, exp += AC3_MAX_COEFS) { | |
371 | if (ch == CPL_CH) { | |
372 | if (!s->blocks[blk-1].cpl_in_use) { | |
373 | exp_strategy[blk] = EXP_NEW; | |
374 | continue; | |
375 | } else if (!s->blocks[blk].cpl_in_use) { | |
376 | exp_strategy[blk] = EXP_REUSE; | |
377 | continue; | |
378 | } | |
379 | } else if (s->blocks[blk].channel_in_cpl[ch] != s->blocks[blk-1].channel_in_cpl[ch]) { | |
380 | exp_strategy[blk] = EXP_NEW; | |
381 | continue; | |
382 | } | |
383 | exp_diff = s->mecc.sad[0](NULL, exp, exp - AC3_MAX_COEFS, 16, 16); | |
384 | exp_strategy[blk] = EXP_REUSE; | |
385 | if (ch == CPL_CH && exp_diff > (EXP_DIFF_THRESHOLD * (s->blocks[blk].end_freq[ch] - s->start_freq[ch]) / AC3_MAX_COEFS)) | |
386 | exp_strategy[blk] = EXP_NEW; | |
387 | else if (ch > CPL_CH && exp_diff > EXP_DIFF_THRESHOLD) | |
388 | exp_strategy[blk] = EXP_NEW; | |
389 | } | |
390 | ||
391 | /* now select the encoding strategy type : if exponents are often | |
392 | recoded, we use a coarse encoding */ | |
393 | blk = 0; | |
394 | while (blk < s->num_blocks) { | |
395 | blk1 = blk + 1; | |
396 | while (blk1 < s->num_blocks && exp_strategy[blk1] == EXP_REUSE) | |
397 | blk1++; | |
398 | exp_strategy[blk] = exp_strategy_reuse_tab[s->num_blks_code][blk1-blk-1]; | |
399 | blk = blk1; | |
400 | } | |
401 | } | |
402 | if (s->lfe_on) { | |
403 | ch = s->lfe_channel; | |
404 | s->exp_strategy[ch][0] = EXP_D15; | |
405 | for (blk = 1; blk < s->num_blocks; blk++) | |
406 | s->exp_strategy[ch][blk] = EXP_REUSE; | |
407 | } | |
408 | ||
409 | /* for E-AC-3, determine frame exponent strategy */ | |
410 | if (CONFIG_EAC3_ENCODER && s->eac3) | |
411 | ff_eac3_get_frame_exp_strategy(s); | |
412 | } | |
413 | ||
414 | ||
415 | /** | |
416 | * Update the exponents so that they are the ones the decoder will decode. | |
417 | * | |
418 | * @param[in,out] exp array of exponents for 1 block in 1 channel | |
419 | * @param nb_exps number of exponents in active bandwidth | |
420 | * @param exp_strategy exponent strategy for the block | |
421 | * @param cpl indicates if the block is in the coupling channel | |
422 | */ | |
423 | static void encode_exponents_blk_ch(uint8_t *exp, int nb_exps, int exp_strategy, | |
424 | int cpl) | |
425 | { | |
426 | int nb_groups, i, k; | |
427 | ||
428 | nb_groups = exponent_group_tab[cpl][exp_strategy-1][nb_exps] * 3; | |
429 | ||
430 | /* for each group, compute the minimum exponent */ | |
431 | switch(exp_strategy) { | |
432 | case EXP_D25: | |
433 | for (i = 1, k = 1-cpl; i <= nb_groups; i++) { | |
434 | uint8_t exp_min = exp[k]; | |
435 | if (exp[k+1] < exp_min) | |
436 | exp_min = exp[k+1]; | |
437 | exp[i-cpl] = exp_min; | |
438 | k += 2; | |
439 | } | |
440 | break; | |
441 | case EXP_D45: | |
442 | for (i = 1, k = 1-cpl; i <= nb_groups; i++) { | |
443 | uint8_t exp_min = exp[k]; | |
444 | if (exp[k+1] < exp_min) | |
445 | exp_min = exp[k+1]; | |
446 | if (exp[k+2] < exp_min) | |
447 | exp_min = exp[k+2]; | |
448 | if (exp[k+3] < exp_min) | |
449 | exp_min = exp[k+3]; | |
450 | exp[i-cpl] = exp_min; | |
451 | k += 4; | |
452 | } | |
453 | break; | |
454 | } | |
455 | ||
456 | /* constraint for DC exponent */ | |
457 | if (!cpl && exp[0] > 15) | |
458 | exp[0] = 15; | |
459 | ||
460 | /* decrease the delta between each groups to within 2 so that they can be | |
461 | differentially encoded */ | |
462 | for (i = 1; i <= nb_groups; i++) | |
463 | exp[i] = FFMIN(exp[i], exp[i-1] + 2); | |
464 | i--; | |
465 | while (--i >= 0) | |
466 | exp[i] = FFMIN(exp[i], exp[i+1] + 2); | |
467 | ||
468 | if (cpl) | |
469 | exp[-1] = exp[0] & ~1; | |
470 | ||
471 | /* now we have the exponent values the decoder will see */ | |
472 | switch (exp_strategy) { | |
473 | case EXP_D25: | |
474 | for (i = nb_groups, k = (nb_groups * 2)-cpl; i > 0; i--) { | |
475 | uint8_t exp1 = exp[i-cpl]; | |
476 | exp[k--] = exp1; | |
477 | exp[k--] = exp1; | |
478 | } | |
479 | break; | |
480 | case EXP_D45: | |
481 | for (i = nb_groups, k = (nb_groups * 4)-cpl; i > 0; i--) { | |
482 | exp[k] = exp[k-1] = exp[k-2] = exp[k-3] = exp[i-cpl]; | |
483 | k -= 4; | |
484 | } | |
485 | break; | |
486 | } | |
487 | } | |
488 | ||
489 | ||
490 | /* | |
491 | * Encode exponents from original extracted form to what the decoder will see. | |
492 | * This copies and groups exponents based on exponent strategy and reduces | |
493 | * deltas between adjacent exponent groups so that they can be differentially | |
494 | * encoded. | |
495 | */ | |
496 | static void encode_exponents(AC3EncodeContext *s) | |
497 | { | |
498 | int blk, blk1, ch, cpl; | |
499 | uint8_t *exp, *exp_strategy; | |
500 | int nb_coefs, num_reuse_blocks; | |
501 | ||
502 | for (ch = !s->cpl_on; ch <= s->channels; ch++) { | |
503 | exp = s->blocks[0].exp[ch] + s->start_freq[ch]; | |
504 | exp_strategy = s->exp_strategy[ch]; | |
505 | ||
506 | cpl = (ch == CPL_CH); | |
507 | blk = 0; | |
508 | while (blk < s->num_blocks) { | |
509 | AC3Block *block = &s->blocks[blk]; | |
510 | if (cpl && !block->cpl_in_use) { | |
511 | exp += AC3_MAX_COEFS; | |
512 | blk++; | |
513 | continue; | |
514 | } | |
515 | nb_coefs = block->end_freq[ch] - s->start_freq[ch]; | |
516 | blk1 = blk + 1; | |
517 | ||
518 | /* count the number of EXP_REUSE blocks after the current block | |
519 | and set exponent reference block numbers */ | |
520 | s->exp_ref_block[ch][blk] = blk; | |
521 | while (blk1 < s->num_blocks && exp_strategy[blk1] == EXP_REUSE) { | |
522 | s->exp_ref_block[ch][blk1] = blk; | |
523 | blk1++; | |
524 | } | |
525 | num_reuse_blocks = blk1 - blk - 1; | |
526 | ||
527 | /* for the EXP_REUSE case we select the min of the exponents */ | |
528 | s->ac3dsp.ac3_exponent_min(exp-s->start_freq[ch], num_reuse_blocks, | |
529 | AC3_MAX_COEFS); | |
530 | ||
531 | encode_exponents_blk_ch(exp, nb_coefs, exp_strategy[blk], cpl); | |
532 | ||
533 | exp += AC3_MAX_COEFS * (num_reuse_blocks + 1); | |
534 | blk = blk1; | |
535 | } | |
536 | } | |
537 | ||
538 | /* reference block numbers have been changed, so reset ref_bap_set */ | |
539 | s->ref_bap_set = 0; | |
540 | } | |
541 | ||
542 | ||
543 | /* | |
544 | * Count exponent bits based on bandwidth, coupling, and exponent strategies. | |
545 | */ | |
546 | static int count_exponent_bits(AC3EncodeContext *s) | |
547 | { | |
548 | int blk, ch; | |
549 | int nb_groups, bit_count; | |
550 | ||
551 | bit_count = 0; | |
552 | for (blk = 0; blk < s->num_blocks; blk++) { | |
553 | AC3Block *block = &s->blocks[blk]; | |
554 | for (ch = !block->cpl_in_use; ch <= s->channels; ch++) { | |
555 | int exp_strategy = s->exp_strategy[ch][blk]; | |
556 | int cpl = (ch == CPL_CH); | |
557 | int nb_coefs = block->end_freq[ch] - s->start_freq[ch]; | |
558 | ||
559 | if (exp_strategy == EXP_REUSE) | |
560 | continue; | |
561 | ||
562 | nb_groups = exponent_group_tab[cpl][exp_strategy-1][nb_coefs]; | |
563 | bit_count += 4 + (nb_groups * 7); | |
564 | } | |
565 | } | |
566 | ||
567 | return bit_count; | |
568 | } | |
569 | ||
570 | ||
571 | /** | |
572 | * Group exponents. | |
573 | * 3 delta-encoded exponents are in each 7-bit group. The number of groups | |
574 | * varies depending on exponent strategy and bandwidth. | |
575 | * | |
576 | * @param s AC-3 encoder private context | |
577 | */ | |
578 | void ff_ac3_group_exponents(AC3EncodeContext *s) | |
579 | { | |
580 | int blk, ch, i, cpl; | |
581 | int group_size, nb_groups; | |
582 | uint8_t *p; | |
583 | int delta0, delta1, delta2; | |
584 | int exp0, exp1; | |
585 | ||
586 | for (blk = 0; blk < s->num_blocks; blk++) { | |
587 | AC3Block *block = &s->blocks[blk]; | |
588 | for (ch = !block->cpl_in_use; ch <= s->channels; ch++) { | |
589 | int exp_strategy = s->exp_strategy[ch][blk]; | |
590 | if (exp_strategy == EXP_REUSE) | |
591 | continue; | |
592 | cpl = (ch == CPL_CH); | |
593 | group_size = exp_strategy + (exp_strategy == EXP_D45); | |
594 | nb_groups = exponent_group_tab[cpl][exp_strategy-1][block->end_freq[ch]-s->start_freq[ch]]; | |
595 | p = block->exp[ch] + s->start_freq[ch] - cpl; | |
596 | ||
597 | /* DC exponent */ | |
598 | exp1 = *p++; | |
599 | block->grouped_exp[ch][0] = exp1; | |
600 | ||
601 | /* remaining exponents are delta encoded */ | |
602 | for (i = 1; i <= nb_groups; i++) { | |
603 | /* merge three delta in one code */ | |
604 | exp0 = exp1; | |
605 | exp1 = p[0]; | |
606 | p += group_size; | |
607 | delta0 = exp1 - exp0 + 2; | |
608 | av_assert2(delta0 >= 0 && delta0 <= 4); | |
609 | ||
610 | exp0 = exp1; | |
611 | exp1 = p[0]; | |
612 | p += group_size; | |
613 | delta1 = exp1 - exp0 + 2; | |
614 | av_assert2(delta1 >= 0 && delta1 <= 4); | |
615 | ||
616 | exp0 = exp1; | |
617 | exp1 = p[0]; | |
618 | p += group_size; | |
619 | delta2 = exp1 - exp0 + 2; | |
620 | av_assert2(delta2 >= 0 && delta2 <= 4); | |
621 | ||
622 | block->grouped_exp[ch][i] = ((delta0 * 5 + delta1) * 5) + delta2; | |
623 | } | |
624 | } | |
625 | } | |
626 | } | |
627 | ||
628 | ||
629 | /** | |
630 | * Calculate final exponents from the supplied MDCT coefficients and exponent shift. | |
631 | * Extract exponents from MDCT coefficients, calculate exponent strategies, | |
632 | * and encode final exponents. | |
633 | * | |
634 | * @param s AC-3 encoder private context | |
635 | */ | |
636 | void ff_ac3_process_exponents(AC3EncodeContext *s) | |
637 | { | |
638 | extract_exponents(s); | |
639 | ||
640 | compute_exp_strategy(s); | |
641 | ||
642 | encode_exponents(s); | |
643 | ||
644 | emms_c(); | |
645 | } | |
646 | ||
647 | ||
648 | /* | |
649 | * Count frame bits that are based solely on fixed parameters. | |
650 | * This only has to be run once when the encoder is initialized. | |
651 | */ | |
652 | static void count_frame_bits_fixed(AC3EncodeContext *s) | |
653 | { | |
654 | static const int frame_bits_inc[8] = { 0, 0, 2, 2, 2, 4, 2, 4 }; | |
655 | int blk; | |
656 | int frame_bits; | |
657 | ||
658 | /* assumptions: | |
659 | * no dynamic range codes | |
660 | * bit allocation parameters do not change between blocks | |
661 | * no delta bit allocation | |
662 | * no skipped data | |
663 | * no auxiliary data | |
664 | * no E-AC-3 metadata | |
665 | */ | |
666 | ||
667 | /* header */ | |
668 | frame_bits = 16; /* sync info */ | |
669 | if (s->eac3) { | |
670 | /* bitstream info header */ | |
671 | frame_bits += 35; | |
672 | frame_bits += 1 + 1; | |
673 | if (s->num_blocks != 0x6) | |
674 | frame_bits++; | |
675 | frame_bits++; | |
676 | /* audio frame header */ | |
677 | if (s->num_blocks == 6) | |
678 | frame_bits += 2; | |
679 | frame_bits += 10; | |
680 | /* exponent strategy */ | |
681 | if (s->use_frame_exp_strategy) | |
682 | frame_bits += 5 * s->fbw_channels; | |
683 | else | |
684 | frame_bits += s->num_blocks * 2 * s->fbw_channels; | |
685 | if (s->lfe_on) | |
686 | frame_bits += s->num_blocks; | |
687 | /* converter exponent strategy */ | |
688 | if (s->num_blks_code != 0x3) | |
689 | frame_bits++; | |
690 | else | |
691 | frame_bits += s->fbw_channels * 5; | |
692 | /* snr offsets */ | |
693 | frame_bits += 10; | |
694 | /* block start info */ | |
695 | if (s->num_blocks != 1) | |
696 | frame_bits++; | |
697 | } else { | |
698 | frame_bits += 49; | |
699 | frame_bits += frame_bits_inc[s->channel_mode]; | |
700 | } | |
701 | ||
702 | /* audio blocks */ | |
703 | for (blk = 0; blk < s->num_blocks; blk++) { | |
704 | if (!s->eac3) { | |
705 | /* block switch flags */ | |
706 | frame_bits += s->fbw_channels; | |
707 | ||
708 | /* dither flags */ | |
709 | frame_bits += s->fbw_channels; | |
710 | } | |
711 | ||
712 | /* dynamic range */ | |
713 | frame_bits++; | |
714 | ||
715 | /* spectral extension */ | |
716 | if (s->eac3) | |
717 | frame_bits++; | |
718 | ||
719 | if (!s->eac3) { | |
720 | /* exponent strategy */ | |
721 | frame_bits += 2 * s->fbw_channels; | |
722 | if (s->lfe_on) | |
723 | frame_bits++; | |
724 | ||
725 | /* bit allocation params */ | |
726 | frame_bits++; | |
727 | if (!blk) | |
728 | frame_bits += 2 + 2 + 2 + 2 + 3; | |
729 | } | |
730 | ||
731 | /* converter snr offset */ | |
732 | if (s->eac3) | |
733 | frame_bits++; | |
734 | ||
735 | if (!s->eac3) { | |
736 | /* delta bit allocation */ | |
737 | frame_bits++; | |
738 | ||
739 | /* skipped data */ | |
740 | frame_bits++; | |
741 | } | |
742 | } | |
743 | ||
744 | /* auxiliary data */ | |
745 | frame_bits++; | |
746 | ||
747 | /* CRC */ | |
748 | frame_bits += 1 + 16; | |
749 | ||
750 | s->frame_bits_fixed = frame_bits; | |
751 | } | |
752 | ||
753 | ||
754 | /* | |
755 | * Initialize bit allocation. | |
756 | * Set default parameter codes and calculate parameter values. | |
757 | */ | |
758 | static av_cold void bit_alloc_init(AC3EncodeContext *s) | |
759 | { | |
760 | int ch; | |
761 | ||
762 | /* init default parameters */ | |
763 | s->slow_decay_code = 2; | |
764 | s->fast_decay_code = 1; | |
765 | s->slow_gain_code = 1; | |
766 | s->db_per_bit_code = s->eac3 ? 2 : 3; | |
767 | s->floor_code = 7; | |
768 | for (ch = 0; ch <= s->channels; ch++) | |
769 | s->fast_gain_code[ch] = 4; | |
770 | ||
771 | /* initial snr offset */ | |
772 | s->coarse_snr_offset = 40; | |
773 | ||
774 | /* compute real values */ | |
775 | /* currently none of these values change during encoding, so we can just | |
776 | set them once at initialization */ | |
777 | s->bit_alloc.slow_decay = ff_ac3_slow_decay_tab[s->slow_decay_code] >> s->bit_alloc.sr_shift; | |
778 | s->bit_alloc.fast_decay = ff_ac3_fast_decay_tab[s->fast_decay_code] >> s->bit_alloc.sr_shift; | |
779 | s->bit_alloc.slow_gain = ff_ac3_slow_gain_tab[s->slow_gain_code]; | |
780 | s->bit_alloc.db_per_bit = ff_ac3_db_per_bit_tab[s->db_per_bit_code]; | |
781 | s->bit_alloc.floor = ff_ac3_floor_tab[s->floor_code]; | |
782 | s->bit_alloc.cpl_fast_leak = 0; | |
783 | s->bit_alloc.cpl_slow_leak = 0; | |
784 | ||
785 | count_frame_bits_fixed(s); | |
786 | } | |
787 | ||
788 | ||
789 | /* | |
790 | * Count the bits used to encode the frame, minus exponents and mantissas. | |
791 | * Bits based on fixed parameters have already been counted, so now we just | |
792 | * have to add the bits based on parameters that change during encoding. | |
793 | */ | |
794 | static void count_frame_bits(AC3EncodeContext *s) | |
795 | { | |
796 | AC3EncOptions *opt = &s->options; | |
797 | int blk, ch; | |
798 | int frame_bits = 0; | |
799 | ||
800 | /* header */ | |
801 | if (s->eac3) { | |
802 | if (opt->eac3_mixing_metadata) { | |
803 | if (s->channel_mode > AC3_CHMODE_STEREO) | |
804 | frame_bits += 2; | |
805 | if (s->has_center) | |
806 | frame_bits += 6; | |
807 | if (s->has_surround) | |
808 | frame_bits += 6; | |
809 | frame_bits += s->lfe_on; | |
810 | frame_bits += 1 + 1 + 2; | |
811 | if (s->channel_mode < AC3_CHMODE_STEREO) | |
812 | frame_bits++; | |
813 | frame_bits++; | |
814 | } | |
815 | if (opt->eac3_info_metadata) { | |
816 | frame_bits += 3 + 1 + 1; | |
817 | if (s->channel_mode == AC3_CHMODE_STEREO) | |
818 | frame_bits += 2 + 2; | |
819 | if (s->channel_mode >= AC3_CHMODE_2F2R) | |
820 | frame_bits += 2; | |
821 | frame_bits++; | |
822 | if (opt->audio_production_info) | |
823 | frame_bits += 5 + 2 + 1; | |
824 | frame_bits++; | |
825 | } | |
826 | /* coupling */ | |
827 | if (s->channel_mode > AC3_CHMODE_MONO) { | |
828 | frame_bits++; | |
829 | for (blk = 1; blk < s->num_blocks; blk++) { | |
830 | AC3Block *block = &s->blocks[blk]; | |
831 | frame_bits++; | |
832 | if (block->new_cpl_strategy) | |
833 | frame_bits++; | |
834 | } | |
835 | } | |
836 | /* coupling exponent strategy */ | |
837 | if (s->cpl_on) { | |
838 | if (s->use_frame_exp_strategy) { | |
839 | frame_bits += 5 * s->cpl_on; | |
840 | } else { | |
841 | for (blk = 0; blk < s->num_blocks; blk++) | |
842 | frame_bits += 2 * s->blocks[blk].cpl_in_use; | |
843 | } | |
844 | } | |
845 | } else { | |
846 | if (opt->audio_production_info) | |
847 | frame_bits += 7; | |
848 | if (s->bitstream_id == 6) { | |
849 | if (opt->extended_bsi_1) | |
850 | frame_bits += 14; | |
851 | if (opt->extended_bsi_2) | |
852 | frame_bits += 14; | |
853 | } | |
854 | } | |
855 | ||
856 | /* audio blocks */ | |
857 | for (blk = 0; blk < s->num_blocks; blk++) { | |
858 | AC3Block *block = &s->blocks[blk]; | |
859 | ||
860 | /* coupling strategy */ | |
861 | if (!s->eac3) | |
862 | frame_bits++; | |
863 | if (block->new_cpl_strategy) { | |
864 | if (!s->eac3) | |
865 | frame_bits++; | |
866 | if (block->cpl_in_use) { | |
867 | if (s->eac3) | |
868 | frame_bits++; | |
869 | if (!s->eac3 || s->channel_mode != AC3_CHMODE_STEREO) | |
870 | frame_bits += s->fbw_channels; | |
871 | if (s->channel_mode == AC3_CHMODE_STEREO) | |
872 | frame_bits++; | |
873 | frame_bits += 4 + 4; | |
874 | if (s->eac3) | |
875 | frame_bits++; | |
876 | else | |
877 | frame_bits += s->num_cpl_subbands - 1; | |
878 | } | |
879 | } | |
880 | ||
881 | /* coupling coordinates */ | |
882 | if (block->cpl_in_use) { | |
883 | for (ch = 1; ch <= s->fbw_channels; ch++) { | |
884 | if (block->channel_in_cpl[ch]) { | |
885 | if (!s->eac3 || block->new_cpl_coords[ch] != 2) | |
886 | frame_bits++; | |
887 | if (block->new_cpl_coords[ch]) { | |
888 | frame_bits += 2; | |
889 | frame_bits += (4 + 4) * s->num_cpl_bands; | |
890 | } | |
891 | } | |
892 | } | |
893 | } | |
894 | ||
895 | /* stereo rematrixing */ | |
896 | if (s->channel_mode == AC3_CHMODE_STEREO) { | |
897 | if (!s->eac3 || blk > 0) | |
898 | frame_bits++; | |
899 | if (s->blocks[blk].new_rematrixing_strategy) | |
900 | frame_bits += block->num_rematrixing_bands; | |
901 | } | |
902 | ||
903 | /* bandwidth codes & gain range */ | |
904 | for (ch = 1; ch <= s->fbw_channels; ch++) { | |
905 | if (s->exp_strategy[ch][blk] != EXP_REUSE) { | |
906 | if (!block->channel_in_cpl[ch]) | |
907 | frame_bits += 6; | |
908 | frame_bits += 2; | |
909 | } | |
910 | } | |
911 | ||
912 | /* coupling exponent strategy */ | |
913 | if (!s->eac3 && block->cpl_in_use) | |
914 | frame_bits += 2; | |
915 | ||
916 | /* snr offsets and fast gain codes */ | |
917 | if (!s->eac3) { | |
918 | frame_bits++; | |
919 | if (block->new_snr_offsets) | |
920 | frame_bits += 6 + (s->channels + block->cpl_in_use) * (4 + 3); | |
921 | } | |
922 | ||
923 | /* coupling leak info */ | |
924 | if (block->cpl_in_use) { | |
925 | if (!s->eac3 || block->new_cpl_leak != 2) | |
926 | frame_bits++; | |
927 | if (block->new_cpl_leak) | |
928 | frame_bits += 3 + 3; | |
929 | } | |
930 | } | |
931 | ||
932 | s->frame_bits = s->frame_bits_fixed + frame_bits; | |
933 | } | |
934 | ||
935 | ||
936 | /* | |
937 | * Calculate masking curve based on the final exponents. | |
938 | * Also calculate the power spectral densities to use in future calculations. | |
939 | */ | |
940 | static void bit_alloc_masking(AC3EncodeContext *s) | |
941 | { | |
942 | int blk, ch; | |
943 | ||
944 | for (blk = 0; blk < s->num_blocks; blk++) { | |
945 | AC3Block *block = &s->blocks[blk]; | |
946 | for (ch = !block->cpl_in_use; ch <= s->channels; ch++) { | |
947 | /* We only need psd and mask for calculating bap. | |
948 | Since we currently do not calculate bap when exponent | |
949 | strategy is EXP_REUSE we do not need to calculate psd or mask. */ | |
950 | if (s->exp_strategy[ch][blk] != EXP_REUSE) { | |
951 | ff_ac3_bit_alloc_calc_psd(block->exp[ch], s->start_freq[ch], | |
952 | block->end_freq[ch], block->psd[ch], | |
953 | block->band_psd[ch]); | |
954 | ff_ac3_bit_alloc_calc_mask(&s->bit_alloc, block->band_psd[ch], | |
955 | s->start_freq[ch], block->end_freq[ch], | |
956 | ff_ac3_fast_gain_tab[s->fast_gain_code[ch]], | |
957 | ch == s->lfe_channel, | |
958 | DBA_NONE, 0, NULL, NULL, NULL, | |
959 | block->mask[ch]); | |
960 | } | |
961 | } | |
962 | } | |
963 | } | |
964 | ||
965 | ||
966 | /* | |
967 | * Ensure that bap for each block and channel point to the current bap_buffer. | |
968 | * They may have been switched during the bit allocation search. | |
969 | */ | |
970 | static void reset_block_bap(AC3EncodeContext *s) | |
971 | { | |
972 | int blk, ch; | |
973 | uint8_t *ref_bap; | |
974 | ||
975 | if (s->ref_bap[0][0] == s->bap_buffer && s->ref_bap_set) | |
976 | return; | |
977 | ||
978 | ref_bap = s->bap_buffer; | |
979 | for (ch = 0; ch <= s->channels; ch++) { | |
980 | for (blk = 0; blk < s->num_blocks; blk++) | |
981 | s->ref_bap[ch][blk] = ref_bap + AC3_MAX_COEFS * s->exp_ref_block[ch][blk]; | |
982 | ref_bap += AC3_MAX_COEFS * s->num_blocks; | |
983 | } | |
984 | s->ref_bap_set = 1; | |
985 | } | |
986 | ||
987 | ||
988 | /** | |
989 | * Initialize mantissa counts. | |
990 | * These are set so that they are padded to the next whole group size when bits | |
991 | * are counted in compute_mantissa_size. | |
992 | * | |
993 | * @param[in,out] mant_cnt running counts for each bap value for each block | |
994 | */ | |
995 | static void count_mantissa_bits_init(uint16_t mant_cnt[AC3_MAX_BLOCKS][16]) | |
996 | { | |
997 | int blk; | |
998 | ||
999 | for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) { | |
1000 | memset(mant_cnt[blk], 0, sizeof(mant_cnt[blk])); | |
1001 | mant_cnt[blk][1] = mant_cnt[blk][2] = 2; | |
1002 | mant_cnt[blk][4] = 1; | |
1003 | } | |
1004 | } | |
1005 | ||
1006 | ||
1007 | /** | |
1008 | * Update mantissa bit counts for all blocks in 1 channel in a given bandwidth | |
1009 | * range. | |
1010 | * | |
1011 | * @param s AC-3 encoder private context | |
1012 | * @param ch channel index | |
1013 | * @param[in,out] mant_cnt running counts for each bap value for each block | |
1014 | * @param start starting coefficient bin | |
1015 | * @param end ending coefficient bin | |
1016 | */ | |
1017 | static void count_mantissa_bits_update_ch(AC3EncodeContext *s, int ch, | |
1018 | uint16_t mant_cnt[AC3_MAX_BLOCKS][16], | |
1019 | int start, int end) | |
1020 | { | |
1021 | int blk; | |
1022 | ||
1023 | for (blk = 0; blk < s->num_blocks; blk++) { | |
1024 | AC3Block *block = &s->blocks[blk]; | |
1025 | if (ch == CPL_CH && !block->cpl_in_use) | |
1026 | continue; | |
1027 | s->ac3dsp.update_bap_counts(mant_cnt[blk], | |
1028 | s->ref_bap[ch][blk] + start, | |
1029 | FFMIN(end, block->end_freq[ch]) - start); | |
1030 | } | |
1031 | } | |
1032 | ||
1033 | ||
1034 | /* | |
1035 | * Count the number of mantissa bits in the frame based on the bap values. | |
1036 | */ | |
1037 | static int count_mantissa_bits(AC3EncodeContext *s) | |
1038 | { | |
1039 | int ch, max_end_freq; | |
1040 | LOCAL_ALIGNED_16(uint16_t, mant_cnt, [AC3_MAX_BLOCKS], [16]); | |
1041 | ||
1042 | count_mantissa_bits_init(mant_cnt); | |
1043 | ||
1044 | max_end_freq = s->bandwidth_code * 3 + 73; | |
1045 | for (ch = !s->cpl_enabled; ch <= s->channels; ch++) | |
1046 | count_mantissa_bits_update_ch(s, ch, mant_cnt, s->start_freq[ch], | |
1047 | max_end_freq); | |
1048 | ||
1049 | return s->ac3dsp.compute_mantissa_size(mant_cnt); | |
1050 | } | |
1051 | ||
1052 | ||
1053 | /** | |
1054 | * Run the bit allocation with a given SNR offset. | |
1055 | * This calculates the bit allocation pointers that will be used to determine | |
1056 | * the quantization of each mantissa. | |
1057 | * | |
1058 | * @param s AC-3 encoder private context | |
1059 | * @param snr_offset SNR offset, 0 to 1023 | |
1060 | * @return the number of bits needed for mantissas if the given SNR offset is | |
1061 | * is used. | |
1062 | */ | |
1063 | static int bit_alloc(AC3EncodeContext *s, int snr_offset) | |
1064 | { | |
1065 | int blk, ch; | |
1066 | ||
1067 | snr_offset = (snr_offset - 240) << 2; | |
1068 | ||
1069 | reset_block_bap(s); | |
1070 | for (blk = 0; blk < s->num_blocks; blk++) { | |
1071 | AC3Block *block = &s->blocks[blk]; | |
1072 | ||
1073 | for (ch = !block->cpl_in_use; ch <= s->channels; ch++) { | |
1074 | /* Currently the only bit allocation parameters which vary across | |
1075 | blocks within a frame are the exponent values. We can take | |
1076 | advantage of that by reusing the bit allocation pointers | |
1077 | whenever we reuse exponents. */ | |
1078 | if (s->exp_strategy[ch][blk] != EXP_REUSE) { | |
1079 | s->ac3dsp.bit_alloc_calc_bap(block->mask[ch], block->psd[ch], | |
1080 | s->start_freq[ch], block->end_freq[ch], | |
1081 | snr_offset, s->bit_alloc.floor, | |
1082 | ff_ac3_bap_tab, s->ref_bap[ch][blk]); | |
1083 | } | |
1084 | } | |
1085 | } | |
1086 | return count_mantissa_bits(s); | |
1087 | } | |
1088 | ||
1089 | ||
1090 | /* | |
1091 | * Constant bitrate bit allocation search. | |
1092 | * Find the largest SNR offset that will allow data to fit in the frame. | |
1093 | */ | |
1094 | static int cbr_bit_allocation(AC3EncodeContext *s) | |
1095 | { | |
1096 | int ch; | |
1097 | int bits_left; | |
1098 | int snr_offset, snr_incr; | |
1099 | ||
1100 | bits_left = 8 * s->frame_size - (s->frame_bits + s->exponent_bits); | |
1101 | if (bits_left < 0) | |
1102 | return AVERROR(EINVAL); | |
1103 | ||
1104 | snr_offset = s->coarse_snr_offset << 4; | |
1105 | ||
1106 | /* if previous frame SNR offset was 1023, check if current frame can also | |
1107 | use SNR offset of 1023. if so, skip the search. */ | |
1108 | if ((snr_offset | s->fine_snr_offset[1]) == 1023) { | |
1109 | if (bit_alloc(s, 1023) <= bits_left) | |
1110 | return 0; | |
1111 | } | |
1112 | ||
1113 | while (snr_offset >= 0 && | |
1114 | bit_alloc(s, snr_offset) > bits_left) { | |
1115 | snr_offset -= 64; | |
1116 | } | |
1117 | if (snr_offset < 0) | |
1118 | return AVERROR(EINVAL); | |
1119 | ||
1120 | FFSWAP(uint8_t *, s->bap_buffer, s->bap1_buffer); | |
1121 | for (snr_incr = 64; snr_incr > 0; snr_incr >>= 2) { | |
1122 | while (snr_offset + snr_incr <= 1023 && | |
1123 | bit_alloc(s, snr_offset + snr_incr) <= bits_left) { | |
1124 | snr_offset += snr_incr; | |
1125 | FFSWAP(uint8_t *, s->bap_buffer, s->bap1_buffer); | |
1126 | } | |
1127 | } | |
1128 | FFSWAP(uint8_t *, s->bap_buffer, s->bap1_buffer); | |
1129 | reset_block_bap(s); | |
1130 | ||
1131 | s->coarse_snr_offset = snr_offset >> 4; | |
1132 | for (ch = !s->cpl_on; ch <= s->channels; ch++) | |
1133 | s->fine_snr_offset[ch] = snr_offset & 0xF; | |
1134 | ||
1135 | return 0; | |
1136 | } | |
1137 | ||
1138 | ||
1139 | /* | |
1140 | * Perform bit allocation search. | |
1141 | * Finds the SNR offset value that maximizes quality and fits in the specified | |
1142 | * frame size. Output is the SNR offset and a set of bit allocation pointers | |
1143 | * used to quantize the mantissas. | |
1144 | */ | |
1145 | int ff_ac3_compute_bit_allocation(AC3EncodeContext *s) | |
1146 | { | |
1147 | count_frame_bits(s); | |
1148 | ||
1149 | s->exponent_bits = count_exponent_bits(s); | |
1150 | ||
1151 | bit_alloc_masking(s); | |
1152 | ||
1153 | return cbr_bit_allocation(s); | |
1154 | } | |
1155 | ||
1156 | ||
1157 | /** | |
1158 | * Symmetric quantization on 'levels' levels. | |
1159 | * | |
1160 | * @param c unquantized coefficient | |
1161 | * @param e exponent | |
1162 | * @param levels number of quantization levels | |
1163 | * @return quantized coefficient | |
1164 | */ | |
1165 | static inline int sym_quant(int c, int e, int levels) | |
1166 | { | |
1167 | int v = (((levels * c) >> (24 - e)) + levels) >> 1; | |
1168 | av_assert2(v >= 0 && v < levels); | |
1169 | return v; | |
1170 | } | |
1171 | ||
1172 | ||
1173 | /** | |
1174 | * Asymmetric quantization on 2^qbits levels. | |
1175 | * | |
1176 | * @param c unquantized coefficient | |
1177 | * @param e exponent | |
1178 | * @param qbits number of quantization bits | |
1179 | * @return quantized coefficient | |
1180 | */ | |
1181 | static inline int asym_quant(int c, int e, int qbits) | |
1182 | { | |
1183 | int m; | |
1184 | ||
1185 | c = (((c << e) >> (24 - qbits)) + 1) >> 1; | |
1186 | m = (1 << (qbits-1)); | |
1187 | if (c >= m) | |
1188 | c = m - 1; | |
1189 | av_assert2(c >= -m); | |
1190 | return c; | |
1191 | } | |
1192 | ||
1193 | ||
1194 | /** | |
1195 | * Quantize a set of mantissas for a single channel in a single block. | |
1196 | * | |
1197 | * @param s Mantissa count context | |
1198 | * @param fixed_coef unquantized fixed-point coefficients | |
1199 | * @param exp exponents | |
1200 | * @param bap bit allocation pointer indices | |
1201 | * @param[out] qmant quantized coefficients | |
1202 | * @param start_freq starting coefficient bin | |
1203 | * @param end_freq ending coefficient bin | |
1204 | */ | |
1205 | static void quantize_mantissas_blk_ch(AC3Mant *s, int32_t *fixed_coef, | |
1206 | uint8_t *exp, uint8_t *bap, | |
1207 | int16_t *qmant, int start_freq, | |
1208 | int end_freq) | |
1209 | { | |
1210 | int i; | |
1211 | ||
1212 | for (i = start_freq; i < end_freq; i++) { | |
1213 | int c = fixed_coef[i]; | |
1214 | int e = exp[i]; | |
1215 | int v = bap[i]; | |
1216 | if (v) | |
1217 | switch (v) { | |
1218 | case 1: | |
1219 | v = sym_quant(c, e, 3); | |
1220 | switch (s->mant1_cnt) { | |
1221 | case 0: | |
1222 | s->qmant1_ptr = &qmant[i]; | |
1223 | v = 9 * v; | |
1224 | s->mant1_cnt = 1; | |
1225 | break; | |
1226 | case 1: | |
1227 | *s->qmant1_ptr += 3 * v; | |
1228 | s->mant1_cnt = 2; | |
1229 | v = 128; | |
1230 | break; | |
1231 | default: | |
1232 | *s->qmant1_ptr += v; | |
1233 | s->mant1_cnt = 0; | |
1234 | v = 128; | |
1235 | break; | |
1236 | } | |
1237 | break; | |
1238 | case 2: | |
1239 | v = sym_quant(c, e, 5); | |
1240 | switch (s->mant2_cnt) { | |
1241 | case 0: | |
1242 | s->qmant2_ptr = &qmant[i]; | |
1243 | v = 25 * v; | |
1244 | s->mant2_cnt = 1; | |
1245 | break; | |
1246 | case 1: | |
1247 | *s->qmant2_ptr += 5 * v; | |
1248 | s->mant2_cnt = 2; | |
1249 | v = 128; | |
1250 | break; | |
1251 | default: | |
1252 | *s->qmant2_ptr += v; | |
1253 | s->mant2_cnt = 0; | |
1254 | v = 128; | |
1255 | break; | |
1256 | } | |
1257 | break; | |
1258 | case 3: | |
1259 | v = sym_quant(c, e, 7); | |
1260 | break; | |
1261 | case 4: | |
1262 | v = sym_quant(c, e, 11); | |
1263 | switch (s->mant4_cnt) { | |
1264 | case 0: | |
1265 | s->qmant4_ptr = &qmant[i]; | |
1266 | v = 11 * v; | |
1267 | s->mant4_cnt = 1; | |
1268 | break; | |
1269 | default: | |
1270 | *s->qmant4_ptr += v; | |
1271 | s->mant4_cnt = 0; | |
1272 | v = 128; | |
1273 | break; | |
1274 | } | |
1275 | break; | |
1276 | case 5: | |
1277 | v = sym_quant(c, e, 15); | |
1278 | break; | |
1279 | case 14: | |
1280 | v = asym_quant(c, e, 14); | |
1281 | break; | |
1282 | case 15: | |
1283 | v = asym_quant(c, e, 16); | |
1284 | break; | |
1285 | default: | |
1286 | v = asym_quant(c, e, v - 1); | |
1287 | break; | |
1288 | } | |
1289 | qmant[i] = v; | |
1290 | } | |
1291 | } | |
1292 | ||
1293 | ||
1294 | /** | |
1295 | * Quantize mantissas using coefficients, exponents, and bit allocation pointers. | |
1296 | * | |
1297 | * @param s AC-3 encoder private context | |
1298 | */ | |
1299 | void ff_ac3_quantize_mantissas(AC3EncodeContext *s) | |
1300 | { | |
1301 | int blk, ch, ch0=0, got_cpl; | |
1302 | ||
1303 | for (blk = 0; blk < s->num_blocks; blk++) { | |
1304 | AC3Block *block = &s->blocks[blk]; | |
1305 | AC3Mant m = { 0 }; | |
1306 | ||
1307 | got_cpl = !block->cpl_in_use; | |
1308 | for (ch = 1; ch <= s->channels; ch++) { | |
1309 | if (!got_cpl && ch > 1 && block->channel_in_cpl[ch-1]) { | |
1310 | ch0 = ch - 1; | |
1311 | ch = CPL_CH; | |
1312 | got_cpl = 1; | |
1313 | } | |
1314 | quantize_mantissas_blk_ch(&m, block->fixed_coef[ch], | |
1315 | s->blocks[s->exp_ref_block[ch][blk]].exp[ch], | |
1316 | s->ref_bap[ch][blk], block->qmant[ch], | |
1317 | s->start_freq[ch], block->end_freq[ch]); | |
1318 | if (ch == CPL_CH) | |
1319 | ch = ch0; | |
1320 | } | |
1321 | } | |
1322 | } | |
1323 | ||
1324 | ||
1325 | /* | |
1326 | * Write the AC-3 frame header to the output bitstream. | |
1327 | */ | |
1328 | static void ac3_output_frame_header(AC3EncodeContext *s) | |
1329 | { | |
1330 | AC3EncOptions *opt = &s->options; | |
1331 | ||
1332 | put_bits(&s->pb, 16, 0x0b77); /* frame header */ | |
1333 | put_bits(&s->pb, 16, 0); /* crc1: will be filled later */ | |
1334 | put_bits(&s->pb, 2, s->bit_alloc.sr_code); | |
1335 | put_bits(&s->pb, 6, s->frame_size_code + (s->frame_size - s->frame_size_min) / 2); | |
1336 | put_bits(&s->pb, 5, s->bitstream_id); | |
1337 | put_bits(&s->pb, 3, s->bitstream_mode); | |
1338 | put_bits(&s->pb, 3, s->channel_mode); | |
1339 | if ((s->channel_mode & 0x01) && s->channel_mode != AC3_CHMODE_MONO) | |
1340 | put_bits(&s->pb, 2, s->center_mix_level); | |
1341 | if (s->channel_mode & 0x04) | |
1342 | put_bits(&s->pb, 2, s->surround_mix_level); | |
1343 | if (s->channel_mode == AC3_CHMODE_STEREO) | |
1344 | put_bits(&s->pb, 2, opt->dolby_surround_mode); | |
1345 | put_bits(&s->pb, 1, s->lfe_on); /* LFE */ | |
1346 | put_bits(&s->pb, 5, -opt->dialogue_level); | |
1347 | put_bits(&s->pb, 1, 0); /* no compression control word */ | |
1348 | put_bits(&s->pb, 1, 0); /* no lang code */ | |
1349 | put_bits(&s->pb, 1, opt->audio_production_info); | |
1350 | if (opt->audio_production_info) { | |
1351 | put_bits(&s->pb, 5, opt->mixing_level - 80); | |
1352 | put_bits(&s->pb, 2, opt->room_type); | |
1353 | } | |
1354 | put_bits(&s->pb, 1, opt->copyright); | |
1355 | put_bits(&s->pb, 1, opt->original); | |
1356 | if (s->bitstream_id == 6) { | |
1357 | /* alternate bit stream syntax */ | |
1358 | put_bits(&s->pb, 1, opt->extended_bsi_1); | |
1359 | if (opt->extended_bsi_1) { | |
1360 | put_bits(&s->pb, 2, opt->preferred_stereo_downmix); | |
1361 | put_bits(&s->pb, 3, s->ltrt_center_mix_level); | |
1362 | put_bits(&s->pb, 3, s->ltrt_surround_mix_level); | |
1363 | put_bits(&s->pb, 3, s->loro_center_mix_level); | |
1364 | put_bits(&s->pb, 3, s->loro_surround_mix_level); | |
1365 | } | |
1366 | put_bits(&s->pb, 1, opt->extended_bsi_2); | |
1367 | if (opt->extended_bsi_2) { | |
1368 | put_bits(&s->pb, 2, opt->dolby_surround_ex_mode); | |
1369 | put_bits(&s->pb, 2, opt->dolby_headphone_mode); | |
1370 | put_bits(&s->pb, 1, opt->ad_converter_type); | |
1371 | put_bits(&s->pb, 9, 0); /* xbsi2 and encinfo : reserved */ | |
1372 | } | |
1373 | } else { | |
1374 | put_bits(&s->pb, 1, 0); /* no time code 1 */ | |
1375 | put_bits(&s->pb, 1, 0); /* no time code 2 */ | |
1376 | } | |
1377 | put_bits(&s->pb, 1, 0); /* no additional bit stream info */ | |
1378 | } | |
1379 | ||
1380 | ||
1381 | /* | |
1382 | * Write one audio block to the output bitstream. | |
1383 | */ | |
1384 | static void output_audio_block(AC3EncodeContext *s, int blk) | |
1385 | { | |
1386 | int ch, i, baie, bnd, got_cpl, av_uninit(ch0); | |
1387 | AC3Block *block = &s->blocks[blk]; | |
1388 | ||
1389 | /* block switching */ | |
1390 | if (!s->eac3) { | |
1391 | for (ch = 0; ch < s->fbw_channels; ch++) | |
1392 | put_bits(&s->pb, 1, 0); | |
1393 | } | |
1394 | ||
1395 | /* dither flags */ | |
1396 | if (!s->eac3) { | |
1397 | for (ch = 0; ch < s->fbw_channels; ch++) | |
1398 | put_bits(&s->pb, 1, 1); | |
1399 | } | |
1400 | ||
1401 | /* dynamic range codes */ | |
1402 | put_bits(&s->pb, 1, 0); | |
1403 | ||
1404 | /* spectral extension */ | |
1405 | if (s->eac3) | |
1406 | put_bits(&s->pb, 1, 0); | |
1407 | ||
1408 | /* channel coupling */ | |
1409 | if (!s->eac3) | |
1410 | put_bits(&s->pb, 1, block->new_cpl_strategy); | |
1411 | if (block->new_cpl_strategy) { | |
1412 | if (!s->eac3) | |
1413 | put_bits(&s->pb, 1, block->cpl_in_use); | |
1414 | if (block->cpl_in_use) { | |
1415 | int start_sub, end_sub; | |
1416 | if (s->eac3) | |
1417 | put_bits(&s->pb, 1, 0); /* enhanced coupling */ | |
1418 | if (!s->eac3 || s->channel_mode != AC3_CHMODE_STEREO) { | |
1419 | for (ch = 1; ch <= s->fbw_channels; ch++) | |
1420 | put_bits(&s->pb, 1, block->channel_in_cpl[ch]); | |
1421 | } | |
1422 | if (s->channel_mode == AC3_CHMODE_STEREO) | |
1423 | put_bits(&s->pb, 1, 0); /* phase flags in use */ | |
1424 | start_sub = (s->start_freq[CPL_CH] - 37) / 12; | |
1425 | end_sub = (s->cpl_end_freq - 37) / 12; | |
1426 | put_bits(&s->pb, 4, start_sub); | |
1427 | put_bits(&s->pb, 4, end_sub - 3); | |
1428 | /* coupling band structure */ | |
1429 | if (s->eac3) { | |
1430 | put_bits(&s->pb, 1, 0); /* use default */ | |
1431 | } else { | |
1432 | for (bnd = start_sub+1; bnd < end_sub; bnd++) | |
1433 | put_bits(&s->pb, 1, ff_eac3_default_cpl_band_struct[bnd]); | |
1434 | } | |
1435 | } | |
1436 | } | |
1437 | ||
1438 | /* coupling coordinates */ | |
1439 | if (block->cpl_in_use) { | |
1440 | for (ch = 1; ch <= s->fbw_channels; ch++) { | |
1441 | if (block->channel_in_cpl[ch]) { | |
1442 | if (!s->eac3 || block->new_cpl_coords[ch] != 2) | |
1443 | put_bits(&s->pb, 1, block->new_cpl_coords[ch]); | |
1444 | if (block->new_cpl_coords[ch]) { | |
1445 | put_bits(&s->pb, 2, block->cpl_master_exp[ch]); | |
1446 | for (bnd = 0; bnd < s->num_cpl_bands; bnd++) { | |
1447 | put_bits(&s->pb, 4, block->cpl_coord_exp [ch][bnd]); | |
1448 | put_bits(&s->pb, 4, block->cpl_coord_mant[ch][bnd]); | |
1449 | } | |
1450 | } | |
1451 | } | |
1452 | } | |
1453 | } | |
1454 | ||
1455 | /* stereo rematrixing */ | |
1456 | if (s->channel_mode == AC3_CHMODE_STEREO) { | |
1457 | if (!s->eac3 || blk > 0) | |
1458 | put_bits(&s->pb, 1, block->new_rematrixing_strategy); | |
1459 | if (block->new_rematrixing_strategy) { | |
1460 | /* rematrixing flags */ | |
1461 | for (bnd = 0; bnd < block->num_rematrixing_bands; bnd++) | |
1462 | put_bits(&s->pb, 1, block->rematrixing_flags[bnd]); | |
1463 | } | |
1464 | } | |
1465 | ||
1466 | /* exponent strategy */ | |
1467 | if (!s->eac3) { | |
1468 | for (ch = !block->cpl_in_use; ch <= s->fbw_channels; ch++) | |
1469 | put_bits(&s->pb, 2, s->exp_strategy[ch][blk]); | |
1470 | if (s->lfe_on) | |
1471 | put_bits(&s->pb, 1, s->exp_strategy[s->lfe_channel][blk]); | |
1472 | } | |
1473 | ||
1474 | /* bandwidth */ | |
1475 | for (ch = 1; ch <= s->fbw_channels; ch++) { | |
1476 | if (s->exp_strategy[ch][blk] != EXP_REUSE && !block->channel_in_cpl[ch]) | |
1477 | put_bits(&s->pb, 6, s->bandwidth_code); | |
1478 | } | |
1479 | ||
1480 | /* exponents */ | |
1481 | for (ch = !block->cpl_in_use; ch <= s->channels; ch++) { | |
1482 | int nb_groups; | |
1483 | int cpl = (ch == CPL_CH); | |
1484 | ||
1485 | if (s->exp_strategy[ch][blk] == EXP_REUSE) | |
1486 | continue; | |
1487 | ||
1488 | /* DC exponent */ | |
1489 | put_bits(&s->pb, 4, block->grouped_exp[ch][0] >> cpl); | |
1490 | ||
1491 | /* exponent groups */ | |
1492 | nb_groups = exponent_group_tab[cpl][s->exp_strategy[ch][blk]-1][block->end_freq[ch]-s->start_freq[ch]]; | |
1493 | for (i = 1; i <= nb_groups; i++) | |
1494 | put_bits(&s->pb, 7, block->grouped_exp[ch][i]); | |
1495 | ||
1496 | /* gain range info */ | |
1497 | if (ch != s->lfe_channel && !cpl) | |
1498 | put_bits(&s->pb, 2, 0); | |
1499 | } | |
1500 | ||
1501 | /* bit allocation info */ | |
1502 | if (!s->eac3) { | |
1503 | baie = (blk == 0); | |
1504 | put_bits(&s->pb, 1, baie); | |
1505 | if (baie) { | |
1506 | put_bits(&s->pb, 2, s->slow_decay_code); | |
1507 | put_bits(&s->pb, 2, s->fast_decay_code); | |
1508 | put_bits(&s->pb, 2, s->slow_gain_code); | |
1509 | put_bits(&s->pb, 2, s->db_per_bit_code); | |
1510 | put_bits(&s->pb, 3, s->floor_code); | |
1511 | } | |
1512 | } | |
1513 | ||
1514 | /* snr offset */ | |
1515 | if (!s->eac3) { | |
1516 | put_bits(&s->pb, 1, block->new_snr_offsets); | |
1517 | if (block->new_snr_offsets) { | |
1518 | put_bits(&s->pb, 6, s->coarse_snr_offset); | |
1519 | for (ch = !block->cpl_in_use; ch <= s->channels; ch++) { | |
1520 | put_bits(&s->pb, 4, s->fine_snr_offset[ch]); | |
1521 | put_bits(&s->pb, 3, s->fast_gain_code[ch]); | |
1522 | } | |
1523 | } | |
1524 | } else { | |
1525 | put_bits(&s->pb, 1, 0); /* no converter snr offset */ | |
1526 | } | |
1527 | ||
1528 | /* coupling leak */ | |
1529 | if (block->cpl_in_use) { | |
1530 | if (!s->eac3 || block->new_cpl_leak != 2) | |
1531 | put_bits(&s->pb, 1, block->new_cpl_leak); | |
1532 | if (block->new_cpl_leak) { | |
1533 | put_bits(&s->pb, 3, s->bit_alloc.cpl_fast_leak); | |
1534 | put_bits(&s->pb, 3, s->bit_alloc.cpl_slow_leak); | |
1535 | } | |
1536 | } | |
1537 | ||
1538 | if (!s->eac3) { | |
1539 | put_bits(&s->pb, 1, 0); /* no delta bit allocation */ | |
1540 | put_bits(&s->pb, 1, 0); /* no data to skip */ | |
1541 | } | |
1542 | ||
1543 | /* mantissas */ | |
1544 | got_cpl = !block->cpl_in_use; | |
1545 | for (ch = 1; ch <= s->channels; ch++) { | |
1546 | int b, q; | |
1547 | ||
1548 | if (!got_cpl && ch > 1 && block->channel_in_cpl[ch-1]) { | |
1549 | ch0 = ch - 1; | |
1550 | ch = CPL_CH; | |
1551 | got_cpl = 1; | |
1552 | } | |
1553 | for (i = s->start_freq[ch]; i < block->end_freq[ch]; i++) { | |
1554 | q = block->qmant[ch][i]; | |
1555 | b = s->ref_bap[ch][blk][i]; | |
1556 | switch (b) { | |
1557 | case 0: break; | |
1558 | case 1: if (q != 128) put_bits (&s->pb, 5, q); break; | |
1559 | case 2: if (q != 128) put_bits (&s->pb, 7, q); break; | |
1560 | case 3: put_sbits(&s->pb, 3, q); break; | |
1561 | case 4: if (q != 128) put_bits (&s->pb, 7, q); break; | |
1562 | case 14: put_sbits(&s->pb, 14, q); break; | |
1563 | case 15: put_sbits(&s->pb, 16, q); break; | |
1564 | default: put_sbits(&s->pb, b-1, q); break; | |
1565 | } | |
1566 | } | |
1567 | if (ch == CPL_CH) | |
1568 | ch = ch0; | |
1569 | } | |
1570 | } | |
1571 | ||
1572 | ||
1573 | /** CRC-16 Polynomial */ | |
1574 | #define CRC16_POLY ((1 << 0) | (1 << 2) | (1 << 15) | (1 << 16)) | |
1575 | ||
1576 | ||
1577 | static unsigned int mul_poly(unsigned int a, unsigned int b, unsigned int poly) | |
1578 | { | |
1579 | unsigned int c; | |
1580 | ||
1581 | c = 0; | |
1582 | while (a) { | |
1583 | if (a & 1) | |
1584 | c ^= b; | |
1585 | a = a >> 1; | |
1586 | b = b << 1; | |
1587 | if (b & (1 << 16)) | |
1588 | b ^= poly; | |
1589 | } | |
1590 | return c; | |
1591 | } | |
1592 | ||
1593 | ||
1594 | static unsigned int pow_poly(unsigned int a, unsigned int n, unsigned int poly) | |
1595 | { | |
1596 | unsigned int r; | |
1597 | r = 1; | |
1598 | while (n) { | |
1599 | if (n & 1) | |
1600 | r = mul_poly(r, a, poly); | |
1601 | a = mul_poly(a, a, poly); | |
1602 | n >>= 1; | |
1603 | } | |
1604 | return r; | |
1605 | } | |
1606 | ||
1607 | ||
1608 | /* | |
1609 | * Fill the end of the frame with 0's and compute the two CRCs. | |
1610 | */ | |
1611 | static void output_frame_end(AC3EncodeContext *s) | |
1612 | { | |
1613 | const AVCRC *crc_ctx = av_crc_get_table(AV_CRC_16_ANSI); | |
1614 | int frame_size_58, pad_bytes, crc1, crc2_partial, crc2, crc_inv; | |
1615 | uint8_t *frame; | |
1616 | ||
1617 | frame_size_58 = ((s->frame_size >> 2) + (s->frame_size >> 4)) << 1; | |
1618 | ||
1619 | /* pad the remainder of the frame with zeros */ | |
1620 | av_assert2(s->frame_size * 8 - put_bits_count(&s->pb) >= 18); | |
1621 | flush_put_bits(&s->pb); | |
1622 | frame = s->pb.buf; | |
1623 | pad_bytes = s->frame_size - (put_bits_ptr(&s->pb) - frame) - 2; | |
1624 | av_assert2(pad_bytes >= 0); | |
1625 | if (pad_bytes > 0) | |
1626 | memset(put_bits_ptr(&s->pb), 0, pad_bytes); | |
1627 | ||
1628 | if (s->eac3) { | |
1629 | /* compute crc2 */ | |
1630 | crc2_partial = av_crc(crc_ctx, 0, frame + 2, s->frame_size - 5); | |
1631 | } else { | |
1632 | /* compute crc1 */ | |
1633 | /* this is not so easy because it is at the beginning of the data... */ | |
1634 | crc1 = av_bswap16(av_crc(crc_ctx, 0, frame + 4, frame_size_58 - 4)); | |
1635 | crc_inv = s->crc_inv[s->frame_size > s->frame_size_min]; | |
1636 | crc1 = mul_poly(crc_inv, crc1, CRC16_POLY); | |
1637 | AV_WB16(frame + 2, crc1); | |
1638 | ||
1639 | /* compute crc2 */ | |
1640 | crc2_partial = av_crc(crc_ctx, 0, frame + frame_size_58, | |
1641 | s->frame_size - frame_size_58 - 3); | |
1642 | } | |
1643 | crc2 = av_crc(crc_ctx, crc2_partial, frame + s->frame_size - 3, 1); | |
1644 | /* ensure crc2 does not match sync word by flipping crcrsv bit if needed */ | |
1645 | if (crc2 == 0x770B) { | |
1646 | frame[s->frame_size - 3] ^= 0x1; | |
1647 | crc2 = av_crc(crc_ctx, crc2_partial, frame + s->frame_size - 3, 1); | |
1648 | } | |
1649 | crc2 = av_bswap16(crc2); | |
1650 | AV_WB16(frame + s->frame_size - 2, crc2); | |
1651 | } | |
1652 | ||
1653 | ||
1654 | /** | |
1655 | * Write the frame to the output bitstream. | |
1656 | * | |
1657 | * @param s AC-3 encoder private context | |
1658 | * @param frame output data buffer | |
1659 | */ | |
1660 | void ff_ac3_output_frame(AC3EncodeContext *s, unsigned char *frame) | |
1661 | { | |
1662 | int blk; | |
1663 | ||
1664 | init_put_bits(&s->pb, frame, AC3_MAX_CODED_FRAME_SIZE); | |
1665 | ||
1666 | s->output_frame_header(s); | |
1667 | ||
1668 | for (blk = 0; blk < s->num_blocks; blk++) | |
1669 | output_audio_block(s, blk); | |
1670 | ||
1671 | output_frame_end(s); | |
1672 | } | |
1673 | ||
1674 | ||
1675 | static void dprint_options(AC3EncodeContext *s) | |
1676 | { | |
1677 | #ifdef DEBUG | |
1678 | AVCodecContext *avctx = s->avctx; | |
1679 | AC3EncOptions *opt = &s->options; | |
1680 | char strbuf[32]; | |
1681 | ||
1682 | switch (s->bitstream_id) { | |
1683 | case 6: av_strlcpy(strbuf, "AC-3 (alt syntax)", 32); break; | |
1684 | case 8: av_strlcpy(strbuf, "AC-3 (standard)", 32); break; | |
1685 | case 9: av_strlcpy(strbuf, "AC-3 (dnet half-rate)", 32); break; | |
1686 | case 10: av_strlcpy(strbuf, "AC-3 (dnet quater-rate)", 32); break; | |
1687 | case 16: av_strlcpy(strbuf, "E-AC-3 (enhanced)", 32); break; | |
1688 | default: snprintf(strbuf, 32, "ERROR"); | |
1689 | } | |
1690 | av_dlog(avctx, "bitstream_id: %s (%d)\n", strbuf, s->bitstream_id); | |
1691 | av_dlog(avctx, "sample_fmt: %s\n", av_get_sample_fmt_name(avctx->sample_fmt)); | |
1692 | av_get_channel_layout_string(strbuf, 32, s->channels, avctx->channel_layout); | |
1693 | av_dlog(avctx, "channel_layout: %s\n", strbuf); | |
1694 | av_dlog(avctx, "sample_rate: %d\n", s->sample_rate); | |
1695 | av_dlog(avctx, "bit_rate: %d\n", s->bit_rate); | |
1696 | av_dlog(avctx, "blocks/frame: %d (code=%d)\n", s->num_blocks, s->num_blks_code); | |
1697 | if (s->cutoff) | |
1698 | av_dlog(avctx, "cutoff: %d\n", s->cutoff); | |
1699 | ||
1700 | av_dlog(avctx, "per_frame_metadata: %s\n", | |
1701 | opt->allow_per_frame_metadata?"on":"off"); | |
1702 | if (s->has_center) | |
1703 | av_dlog(avctx, "center_mixlev: %0.3f (%d)\n", opt->center_mix_level, | |
1704 | s->center_mix_level); | |
1705 | else | |
1706 | av_dlog(avctx, "center_mixlev: {not written}\n"); | |
1707 | if (s->has_surround) | |
1708 | av_dlog(avctx, "surround_mixlev: %0.3f (%d)\n", opt->surround_mix_level, | |
1709 | s->surround_mix_level); | |
1710 | else | |
1711 | av_dlog(avctx, "surround_mixlev: {not written}\n"); | |
1712 | if (opt->audio_production_info) { | |
1713 | av_dlog(avctx, "mixing_level: %ddB\n", opt->mixing_level); | |
1714 | switch (opt->room_type) { | |
1715 | case AC3ENC_OPT_NOT_INDICATED: av_strlcpy(strbuf, "notindicated", 32); break; | |
1716 | case AC3ENC_OPT_LARGE_ROOM: av_strlcpy(strbuf, "large", 32); break; | |
1717 | case AC3ENC_OPT_SMALL_ROOM: av_strlcpy(strbuf, "small", 32); break; | |
1718 | default: snprintf(strbuf, 32, "ERROR (%d)", opt->room_type); | |
1719 | } | |
1720 | av_dlog(avctx, "room_type: %s\n", strbuf); | |
1721 | } else { | |
1722 | av_dlog(avctx, "mixing_level: {not written}\n"); | |
1723 | av_dlog(avctx, "room_type: {not written}\n"); | |
1724 | } | |
1725 | av_dlog(avctx, "copyright: %s\n", opt->copyright?"on":"off"); | |
1726 | av_dlog(avctx, "dialnorm: %ddB\n", opt->dialogue_level); | |
1727 | if (s->channel_mode == AC3_CHMODE_STEREO) { | |
1728 | switch (opt->dolby_surround_mode) { | |
1729 | case AC3ENC_OPT_NOT_INDICATED: av_strlcpy(strbuf, "notindicated", 32); break; | |
1730 | case AC3ENC_OPT_MODE_ON: av_strlcpy(strbuf, "on", 32); break; | |
1731 | case AC3ENC_OPT_MODE_OFF: av_strlcpy(strbuf, "off", 32); break; | |
1732 | default: snprintf(strbuf, 32, "ERROR (%d)", opt->dolby_surround_mode); | |
1733 | } | |
1734 | av_dlog(avctx, "dsur_mode: %s\n", strbuf); | |
1735 | } else { | |
1736 | av_dlog(avctx, "dsur_mode: {not written}\n"); | |
1737 | } | |
1738 | av_dlog(avctx, "original: %s\n", opt->original?"on":"off"); | |
1739 | ||
1740 | if (s->bitstream_id == 6) { | |
1741 | if (opt->extended_bsi_1) { | |
1742 | switch (opt->preferred_stereo_downmix) { | |
1743 | case AC3ENC_OPT_NOT_INDICATED: av_strlcpy(strbuf, "notindicated", 32); break; | |
1744 | case AC3ENC_OPT_DOWNMIX_LTRT: av_strlcpy(strbuf, "ltrt", 32); break; | |
1745 | case AC3ENC_OPT_DOWNMIX_LORO: av_strlcpy(strbuf, "loro", 32); break; | |
1746 | default: snprintf(strbuf, 32, "ERROR (%d)", opt->preferred_stereo_downmix); | |
1747 | } | |
1748 | av_dlog(avctx, "dmix_mode: %s\n", strbuf); | |
1749 | av_dlog(avctx, "ltrt_cmixlev: %0.3f (%d)\n", | |
1750 | opt->ltrt_center_mix_level, s->ltrt_center_mix_level); | |
1751 | av_dlog(avctx, "ltrt_surmixlev: %0.3f (%d)\n", | |
1752 | opt->ltrt_surround_mix_level, s->ltrt_surround_mix_level); | |
1753 | av_dlog(avctx, "loro_cmixlev: %0.3f (%d)\n", | |
1754 | opt->loro_center_mix_level, s->loro_center_mix_level); | |
1755 | av_dlog(avctx, "loro_surmixlev: %0.3f (%d)\n", | |
1756 | opt->loro_surround_mix_level, s->loro_surround_mix_level); | |
1757 | } else { | |
1758 | av_dlog(avctx, "extended bitstream info 1: {not written}\n"); | |
1759 | } | |
1760 | if (opt->extended_bsi_2) { | |
1761 | switch (opt->dolby_surround_ex_mode) { | |
1762 | case AC3ENC_OPT_NOT_INDICATED: av_strlcpy(strbuf, "notindicated", 32); break; | |
1763 | case AC3ENC_OPT_MODE_ON: av_strlcpy(strbuf, "on", 32); break; | |
1764 | case AC3ENC_OPT_MODE_OFF: av_strlcpy(strbuf, "off", 32); break; | |
1765 | default: snprintf(strbuf, 32, "ERROR (%d)", opt->dolby_surround_ex_mode); | |
1766 | } | |
1767 | av_dlog(avctx, "dsurex_mode: %s\n", strbuf); | |
1768 | switch (opt->dolby_headphone_mode) { | |
1769 | case AC3ENC_OPT_NOT_INDICATED: av_strlcpy(strbuf, "notindicated", 32); break; | |
1770 | case AC3ENC_OPT_MODE_ON: av_strlcpy(strbuf, "on", 32); break; | |
1771 | case AC3ENC_OPT_MODE_OFF: av_strlcpy(strbuf, "off", 32); break; | |
1772 | default: snprintf(strbuf, 32, "ERROR (%d)", opt->dolby_headphone_mode); | |
1773 | } | |
1774 | av_dlog(avctx, "dheadphone_mode: %s\n", strbuf); | |
1775 | ||
1776 | switch (opt->ad_converter_type) { | |
1777 | case AC3ENC_OPT_ADCONV_STANDARD: av_strlcpy(strbuf, "standard", 32); break; | |
1778 | case AC3ENC_OPT_ADCONV_HDCD: av_strlcpy(strbuf, "hdcd", 32); break; | |
1779 | default: snprintf(strbuf, 32, "ERROR (%d)", opt->ad_converter_type); | |
1780 | } | |
1781 | av_dlog(avctx, "ad_conv_type: %s\n", strbuf); | |
1782 | } else { | |
1783 | av_dlog(avctx, "extended bitstream info 2: {not written}\n"); | |
1784 | } | |
1785 | } | |
1786 | #endif | |
1787 | } | |
1788 | ||
1789 | ||
1790 | #define FLT_OPTION_THRESHOLD 0.01 | |
1791 | ||
1792 | static int validate_float_option(float v, const float *v_list, int v_list_size) | |
1793 | { | |
1794 | int i; | |
1795 | ||
1796 | for (i = 0; i < v_list_size; i++) { | |
1797 | if (v < (v_list[i] + FLT_OPTION_THRESHOLD) && | |
1798 | v > (v_list[i] - FLT_OPTION_THRESHOLD)) | |
1799 | break; | |
1800 | } | |
1801 | if (i == v_list_size) | |
1802 | return -1; | |
1803 | ||
1804 | return i; | |
1805 | } | |
1806 | ||
1807 | ||
1808 | static void validate_mix_level(void *log_ctx, const char *opt_name, | |
1809 | float *opt_param, const float *list, | |
1810 | int list_size, int default_value, int min_value, | |
1811 | int *ctx_param) | |
1812 | { | |
1813 | int mixlev = validate_float_option(*opt_param, list, list_size); | |
1814 | if (mixlev < min_value) { | |
1815 | mixlev = default_value; | |
1816 | if (*opt_param >= 0.0) { | |
1817 | av_log(log_ctx, AV_LOG_WARNING, "requested %s is not valid. using " | |
1818 | "default value: %0.3f\n", opt_name, list[mixlev]); | |
1819 | } | |
1820 | } | |
1821 | *opt_param = list[mixlev]; | |
1822 | *ctx_param = mixlev; | |
1823 | } | |
1824 | ||
1825 | ||
1826 | /** | |
1827 | * Validate metadata options as set by AVOption system. | |
1828 | * These values can optionally be changed per-frame. | |
1829 | * | |
1830 | * @param s AC-3 encoder private context | |
1831 | */ | |
1832 | int ff_ac3_validate_metadata(AC3EncodeContext *s) | |
1833 | { | |
1834 | AVCodecContext *avctx = s->avctx; | |
1835 | AC3EncOptions *opt = &s->options; | |
1836 | ||
1837 | opt->audio_production_info = 0; | |
1838 | opt->extended_bsi_1 = 0; | |
1839 | opt->extended_bsi_2 = 0; | |
1840 | opt->eac3_mixing_metadata = 0; | |
1841 | opt->eac3_info_metadata = 0; | |
1842 | ||
1843 | /* determine mixing metadata / xbsi1 use */ | |
1844 | if (s->channel_mode > AC3_CHMODE_STEREO && opt->preferred_stereo_downmix != AC3ENC_OPT_NONE) { | |
1845 | opt->extended_bsi_1 = 1; | |
1846 | opt->eac3_mixing_metadata = 1; | |
1847 | } | |
1848 | if (s->has_center && | |
1849 | (opt->ltrt_center_mix_level >= 0 || opt->loro_center_mix_level >= 0)) { | |
1850 | opt->extended_bsi_1 = 1; | |
1851 | opt->eac3_mixing_metadata = 1; | |
1852 | } | |
1853 | if (s->has_surround && | |
1854 | (opt->ltrt_surround_mix_level >= 0 || opt->loro_surround_mix_level >= 0)) { | |
1855 | opt->extended_bsi_1 = 1; | |
1856 | opt->eac3_mixing_metadata = 1; | |
1857 | } | |
1858 | ||
1859 | if (s->eac3) { | |
1860 | /* determine info metadata use */ | |
1861 | if (avctx->audio_service_type != AV_AUDIO_SERVICE_TYPE_MAIN) | |
1862 | opt->eac3_info_metadata = 1; | |
1863 | if (opt->copyright != AC3ENC_OPT_NONE || opt->original != AC3ENC_OPT_NONE) | |
1864 | opt->eac3_info_metadata = 1; | |
1865 | if (s->channel_mode == AC3_CHMODE_STEREO && | |
1866 | (opt->dolby_headphone_mode != AC3ENC_OPT_NONE || opt->dolby_surround_mode != AC3ENC_OPT_NONE)) | |
1867 | opt->eac3_info_metadata = 1; | |
1868 | if (s->channel_mode >= AC3_CHMODE_2F2R && opt->dolby_surround_ex_mode != AC3ENC_OPT_NONE) | |
1869 | opt->eac3_info_metadata = 1; | |
1870 | if (opt->mixing_level != AC3ENC_OPT_NONE || opt->room_type != AC3ENC_OPT_NONE || | |
1871 | opt->ad_converter_type != AC3ENC_OPT_NONE) { | |
1872 | opt->audio_production_info = 1; | |
1873 | opt->eac3_info_metadata = 1; | |
1874 | } | |
1875 | } else { | |
1876 | /* determine audio production info use */ | |
1877 | if (opt->mixing_level != AC3ENC_OPT_NONE || opt->room_type != AC3ENC_OPT_NONE) | |
1878 | opt->audio_production_info = 1; | |
1879 | ||
1880 | /* determine xbsi2 use */ | |
1881 | if (s->channel_mode >= AC3_CHMODE_2F2R && opt->dolby_surround_ex_mode != AC3ENC_OPT_NONE) | |
1882 | opt->extended_bsi_2 = 1; | |
1883 | if (s->channel_mode == AC3_CHMODE_STEREO && opt->dolby_headphone_mode != AC3ENC_OPT_NONE) | |
1884 | opt->extended_bsi_2 = 1; | |
1885 | if (opt->ad_converter_type != AC3ENC_OPT_NONE) | |
1886 | opt->extended_bsi_2 = 1; | |
1887 | } | |
1888 | ||
1889 | /* validate AC-3 mixing levels */ | |
1890 | if (!s->eac3) { | |
1891 | if (s->has_center) { | |
1892 | validate_mix_level(avctx, "center_mix_level", &opt->center_mix_level, | |
1893 | cmixlev_options, CMIXLEV_NUM_OPTIONS, 1, 0, | |
1894 | &s->center_mix_level); | |
1895 | } | |
1896 | if (s->has_surround) { | |
1897 | validate_mix_level(avctx, "surround_mix_level", &opt->surround_mix_level, | |
1898 | surmixlev_options, SURMIXLEV_NUM_OPTIONS, 1, 0, | |
1899 | &s->surround_mix_level); | |
1900 | } | |
1901 | } | |
1902 | ||
1903 | /* validate extended bsi 1 / mixing metadata */ | |
1904 | if (opt->extended_bsi_1 || opt->eac3_mixing_metadata) { | |
1905 | /* default preferred stereo downmix */ | |
1906 | if (opt->preferred_stereo_downmix == AC3ENC_OPT_NONE) | |
1907 | opt->preferred_stereo_downmix = AC3ENC_OPT_NOT_INDICATED; | |
1908 | if (!s->eac3 || s->has_center) { | |
1909 | /* validate Lt/Rt center mix level */ | |
1910 | validate_mix_level(avctx, "ltrt_center_mix_level", | |
1911 | &opt->ltrt_center_mix_level, extmixlev_options, | |
1912 | EXTMIXLEV_NUM_OPTIONS, 5, 0, | |
1913 | &s->ltrt_center_mix_level); | |
1914 | /* validate Lo/Ro center mix level */ | |
1915 | validate_mix_level(avctx, "loro_center_mix_level", | |
1916 | &opt->loro_center_mix_level, extmixlev_options, | |
1917 | EXTMIXLEV_NUM_OPTIONS, 5, 0, | |
1918 | &s->loro_center_mix_level); | |
1919 | } | |
1920 | if (!s->eac3 || s->has_surround) { | |
1921 | /* validate Lt/Rt surround mix level */ | |
1922 | validate_mix_level(avctx, "ltrt_surround_mix_level", | |
1923 | &opt->ltrt_surround_mix_level, extmixlev_options, | |
1924 | EXTMIXLEV_NUM_OPTIONS, 6, 3, | |
1925 | &s->ltrt_surround_mix_level); | |
1926 | /* validate Lo/Ro surround mix level */ | |
1927 | validate_mix_level(avctx, "loro_surround_mix_level", | |
1928 | &opt->loro_surround_mix_level, extmixlev_options, | |
1929 | EXTMIXLEV_NUM_OPTIONS, 6, 3, | |
1930 | &s->loro_surround_mix_level); | |
1931 | } | |
1932 | } | |
1933 | ||
1934 | /* validate audio service type / channels combination */ | |
1935 | if ((avctx->audio_service_type == AV_AUDIO_SERVICE_TYPE_KARAOKE && | |
1936 | avctx->channels == 1) || | |
1937 | ((avctx->audio_service_type == AV_AUDIO_SERVICE_TYPE_COMMENTARY || | |
1938 | avctx->audio_service_type == AV_AUDIO_SERVICE_TYPE_EMERGENCY || | |
1939 | avctx->audio_service_type == AV_AUDIO_SERVICE_TYPE_VOICE_OVER) | |
1940 | && avctx->channels > 1)) { | |
1941 | av_log(avctx, AV_LOG_ERROR, "invalid audio service type for the " | |
1942 | "specified number of channels\n"); | |
1943 | return AVERROR(EINVAL); | |
1944 | } | |
1945 | ||
1946 | /* validate extended bsi 2 / info metadata */ | |
1947 | if (opt->extended_bsi_2 || opt->eac3_info_metadata) { | |
1948 | /* default dolby headphone mode */ | |
1949 | if (opt->dolby_headphone_mode == AC3ENC_OPT_NONE) | |
1950 | opt->dolby_headphone_mode = AC3ENC_OPT_NOT_INDICATED; | |
1951 | /* default dolby surround ex mode */ | |
1952 | if (opt->dolby_surround_ex_mode == AC3ENC_OPT_NONE) | |
1953 | opt->dolby_surround_ex_mode = AC3ENC_OPT_NOT_INDICATED; | |
1954 | /* default A/D converter type */ | |
1955 | if (opt->ad_converter_type == AC3ENC_OPT_NONE) | |
1956 | opt->ad_converter_type = AC3ENC_OPT_ADCONV_STANDARD; | |
1957 | } | |
1958 | ||
1959 | /* copyright & original defaults */ | |
1960 | if (!s->eac3 || opt->eac3_info_metadata) { | |
1961 | /* default copyright */ | |
1962 | if (opt->copyright == AC3ENC_OPT_NONE) | |
1963 | opt->copyright = AC3ENC_OPT_OFF; | |
1964 | /* default original */ | |
1965 | if (opt->original == AC3ENC_OPT_NONE) | |
1966 | opt->original = AC3ENC_OPT_ON; | |
1967 | } | |
1968 | ||
1969 | /* dolby surround mode default */ | |
1970 | if (!s->eac3 || opt->eac3_info_metadata) { | |
1971 | if (opt->dolby_surround_mode == AC3ENC_OPT_NONE) | |
1972 | opt->dolby_surround_mode = AC3ENC_OPT_NOT_INDICATED; | |
1973 | } | |
1974 | ||
1975 | /* validate audio production info */ | |
1976 | if (opt->audio_production_info) { | |
1977 | if (opt->mixing_level == AC3ENC_OPT_NONE) { | |
1978 | av_log(avctx, AV_LOG_ERROR, "mixing_level must be set if " | |
1979 | "room_type is set\n"); | |
1980 | return AVERROR(EINVAL); | |
1981 | } | |
1982 | if (opt->mixing_level < 80) { | |
1983 | av_log(avctx, AV_LOG_ERROR, "invalid mixing level. must be between " | |
1984 | "80dB and 111dB\n"); | |
1985 | return AVERROR(EINVAL); | |
1986 | } | |
1987 | /* default room type */ | |
1988 | if (opt->room_type == AC3ENC_OPT_NONE) | |
1989 | opt->room_type = AC3ENC_OPT_NOT_INDICATED; | |
1990 | } | |
1991 | ||
1992 | /* set bitstream id for alternate bitstream syntax */ | |
1993 | if (!s->eac3 && (opt->extended_bsi_1 || opt->extended_bsi_2)) { | |
1994 | if (s->bitstream_id > 8 && s->bitstream_id < 11) { | |
1995 | static int warn_once = 1; | |
1996 | if (warn_once) { | |
1997 | av_log(avctx, AV_LOG_WARNING, "alternate bitstream syntax is " | |
1998 | "not compatible with reduced samplerates. writing of " | |
1999 | "extended bitstream information will be disabled.\n"); | |
2000 | warn_once = 0; | |
2001 | } | |
2002 | } else { | |
2003 | s->bitstream_id = 6; | |
2004 | } | |
2005 | } | |
2006 | ||
2007 | return 0; | |
2008 | } | |
2009 | ||
2010 | ||
2011 | /** | |
2012 | * Finalize encoding and free any memory allocated by the encoder. | |
2013 | * | |
2014 | * @param avctx Codec context | |
2015 | */ | |
2016 | av_cold int ff_ac3_encode_close(AVCodecContext *avctx) | |
2017 | { | |
2018 | int blk, ch; | |
2019 | AC3EncodeContext *s = avctx->priv_data; | |
2020 | ||
2021 | av_freep(&s->windowed_samples); | |
2022 | if (s->planar_samples) | |
2023 | for (ch = 0; ch < s->channels; ch++) | |
2024 | av_freep(&s->planar_samples[ch]); | |
2025 | av_freep(&s->planar_samples); | |
2026 | av_freep(&s->bap_buffer); | |
2027 | av_freep(&s->bap1_buffer); | |
2028 | av_freep(&s->mdct_coef_buffer); | |
2029 | av_freep(&s->fixed_coef_buffer); | |
2030 | av_freep(&s->exp_buffer); | |
2031 | av_freep(&s->grouped_exp_buffer); | |
2032 | av_freep(&s->psd_buffer); | |
2033 | av_freep(&s->band_psd_buffer); | |
2034 | av_freep(&s->mask_buffer); | |
2035 | av_freep(&s->qmant_buffer); | |
2036 | av_freep(&s->cpl_coord_exp_buffer); | |
2037 | av_freep(&s->cpl_coord_mant_buffer); | |
f6fa7814 | 2038 | av_freep(&s->fdsp); |
2ba45a60 DM |
2039 | for (blk = 0; blk < s->num_blocks; blk++) { |
2040 | AC3Block *block = &s->blocks[blk]; | |
2041 | av_freep(&block->mdct_coef); | |
2042 | av_freep(&block->fixed_coef); | |
2043 | av_freep(&block->exp); | |
2044 | av_freep(&block->grouped_exp); | |
2045 | av_freep(&block->psd); | |
2046 | av_freep(&block->band_psd); | |
2047 | av_freep(&block->mask); | |
2048 | av_freep(&block->qmant); | |
2049 | av_freep(&block->cpl_coord_exp); | |
2050 | av_freep(&block->cpl_coord_mant); | |
2051 | } | |
2052 | ||
2053 | s->mdct_end(s); | |
2054 | ||
2055 | return 0; | |
2056 | } | |
2057 | ||
2058 | ||
2059 | /* | |
2060 | * Set channel information during initialization. | |
2061 | */ | |
2062 | static av_cold int set_channel_info(AC3EncodeContext *s, int channels, | |
2063 | uint64_t *channel_layout) | |
2064 | { | |
2065 | int ch_layout; | |
2066 | ||
2067 | if (channels < 1 || channels > AC3_MAX_CHANNELS) | |
2068 | return AVERROR(EINVAL); | |
2069 | if (*channel_layout > 0x7FF) | |
2070 | return AVERROR(EINVAL); | |
2071 | ch_layout = *channel_layout; | |
2072 | if (!ch_layout) | |
2073 | ch_layout = av_get_default_channel_layout(channels); | |
2074 | ||
2075 | s->lfe_on = !!(ch_layout & AV_CH_LOW_FREQUENCY); | |
2076 | s->channels = channels; | |
2077 | s->fbw_channels = channels - s->lfe_on; | |
2078 | s->lfe_channel = s->lfe_on ? s->fbw_channels + 1 : -1; | |
2079 | if (s->lfe_on) | |
2080 | ch_layout -= AV_CH_LOW_FREQUENCY; | |
2081 | ||
2082 | switch (ch_layout) { | |
2083 | case AV_CH_LAYOUT_MONO: s->channel_mode = AC3_CHMODE_MONO; break; | |
2084 | case AV_CH_LAYOUT_STEREO: s->channel_mode = AC3_CHMODE_STEREO; break; | |
2085 | case AV_CH_LAYOUT_SURROUND: s->channel_mode = AC3_CHMODE_3F; break; | |
2086 | case AV_CH_LAYOUT_2_1: s->channel_mode = AC3_CHMODE_2F1R; break; | |
2087 | case AV_CH_LAYOUT_4POINT0: s->channel_mode = AC3_CHMODE_3F1R; break; | |
2088 | case AV_CH_LAYOUT_QUAD: | |
2089 | case AV_CH_LAYOUT_2_2: s->channel_mode = AC3_CHMODE_2F2R; break; | |
2090 | case AV_CH_LAYOUT_5POINT0: | |
2091 | case AV_CH_LAYOUT_5POINT0_BACK: s->channel_mode = AC3_CHMODE_3F2R; break; | |
2092 | default: | |
2093 | return AVERROR(EINVAL); | |
2094 | } | |
2095 | s->has_center = (s->channel_mode & 0x01) && s->channel_mode != AC3_CHMODE_MONO; | |
2096 | s->has_surround = s->channel_mode & 0x04; | |
2097 | ||
2098 | s->channel_map = ff_ac3_enc_channel_map[s->channel_mode][s->lfe_on]; | |
2099 | *channel_layout = ch_layout; | |
2100 | if (s->lfe_on) | |
2101 | *channel_layout |= AV_CH_LOW_FREQUENCY; | |
2102 | ||
2103 | return 0; | |
2104 | } | |
2105 | ||
2106 | ||
2107 | static av_cold int validate_options(AC3EncodeContext *s) | |
2108 | { | |
2109 | AVCodecContext *avctx = s->avctx; | |
2110 | int i, ret, max_sr; | |
2111 | ||
2112 | /* validate channel layout */ | |
2113 | if (!avctx->channel_layout) { | |
2114 | av_log(avctx, AV_LOG_WARNING, "No channel layout specified. The " | |
2115 | "encoder will guess the layout, but it " | |
2116 | "might be incorrect.\n"); | |
2117 | } | |
2118 | ret = set_channel_info(s, avctx->channels, &avctx->channel_layout); | |
2119 | if (ret) { | |
2120 | av_log(avctx, AV_LOG_ERROR, "invalid channel layout\n"); | |
2121 | return ret; | |
2122 | } | |
2123 | ||
2124 | /* validate sample rate */ | |
2125 | /* note: max_sr could be changed from 2 to 5 for E-AC-3 once we find a | |
2126 | decoder that supports half sample rate so we can validate that | |
2127 | the generated files are correct. */ | |
2128 | max_sr = s->eac3 ? 2 : 8; | |
2129 | for (i = 0; i <= max_sr; i++) { | |
2130 | if ((ff_ac3_sample_rate_tab[i % 3] >> (i / 3)) == avctx->sample_rate) | |
2131 | break; | |
2132 | } | |
2133 | if (i > max_sr) { | |
2134 | av_log(avctx, AV_LOG_ERROR, "invalid sample rate\n"); | |
2135 | return AVERROR(EINVAL); | |
2136 | } | |
2137 | s->sample_rate = avctx->sample_rate; | |
2138 | s->bit_alloc.sr_shift = i / 3; | |
2139 | s->bit_alloc.sr_code = i % 3; | |
2140 | s->bitstream_id = s->eac3 ? 16 : 8 + s->bit_alloc.sr_shift; | |
2141 | ||
2142 | /* select a default bit rate if not set by the user */ | |
2143 | if (!avctx->bit_rate) { | |
2144 | switch (s->fbw_channels) { | |
2145 | case 1: avctx->bit_rate = 96000; break; | |
2146 | case 2: avctx->bit_rate = 192000; break; | |
2147 | case 3: avctx->bit_rate = 320000; break; | |
2148 | case 4: avctx->bit_rate = 384000; break; | |
2149 | case 5: avctx->bit_rate = 448000; break; | |
2150 | } | |
2151 | } | |
2152 | ||
2153 | /* validate bit rate */ | |
2154 | if (s->eac3) { | |
2155 | int max_br, min_br, wpf, min_br_dist, min_br_code; | |
2156 | int num_blks_code, num_blocks, frame_samples; | |
2157 | ||
2158 | /* calculate min/max bitrate */ | |
2159 | /* TODO: More testing with 3 and 2 blocks. All E-AC-3 samples I've | |
2160 | found use either 6 blocks or 1 block, even though 2 or 3 blocks | |
2161 | would work as far as the bit rate is concerned. */ | |
2162 | for (num_blks_code = 3; num_blks_code >= 0; num_blks_code--) { | |
2163 | num_blocks = ((int[]){ 1, 2, 3, 6 })[num_blks_code]; | |
2164 | frame_samples = AC3_BLOCK_SIZE * num_blocks; | |
2165 | max_br = 2048 * s->sample_rate / frame_samples * 16; | |
2166 | min_br = ((s->sample_rate + (frame_samples-1)) / frame_samples) * 16; | |
2167 | if (avctx->bit_rate <= max_br) | |
2168 | break; | |
2169 | } | |
2170 | if (avctx->bit_rate < min_br || avctx->bit_rate > max_br) { | |
2171 | av_log(avctx, AV_LOG_ERROR, "invalid bit rate. must be %d to %d " | |
2172 | "for this sample rate\n", min_br, max_br); | |
2173 | return AVERROR(EINVAL); | |
2174 | } | |
2175 | s->num_blks_code = num_blks_code; | |
2176 | s->num_blocks = num_blocks; | |
2177 | ||
2178 | /* calculate words-per-frame for the selected bitrate */ | |
2179 | wpf = (avctx->bit_rate / 16) * frame_samples / s->sample_rate; | |
2180 | av_assert1(wpf > 0 && wpf <= 2048); | |
2181 | ||
2182 | /* find the closest AC-3 bitrate code to the selected bitrate. | |
2183 | this is needed for lookup tables for bandwidth and coupling | |
2184 | parameter selection */ | |
2185 | min_br_code = -1; | |
2186 | min_br_dist = INT_MAX; | |
2187 | for (i = 0; i < 19; i++) { | |
2188 | int br_dist = abs(ff_ac3_bitrate_tab[i] * 1000 - avctx->bit_rate); | |
2189 | if (br_dist < min_br_dist) { | |
2190 | min_br_dist = br_dist; | |
2191 | min_br_code = i; | |
2192 | } | |
2193 | } | |
2194 | ||
2195 | /* make sure the minimum frame size is below the average frame size */ | |
2196 | s->frame_size_code = min_br_code << 1; | |
2197 | while (wpf > 1 && wpf * s->sample_rate / AC3_FRAME_SIZE * 16 > avctx->bit_rate) | |
2198 | wpf--; | |
2199 | s->frame_size_min = 2 * wpf; | |
2200 | } else { | |
2201 | int best_br = 0, best_code = 0, best_diff = INT_MAX; | |
2202 | for (i = 0; i < 19; i++) { | |
2203 | int br = (ff_ac3_bitrate_tab[i] >> s->bit_alloc.sr_shift) * 1000; | |
2204 | int diff = abs(br - avctx->bit_rate); | |
2205 | if (diff < best_diff) { | |
2206 | best_br = br; | |
2207 | best_code = i; | |
2208 | best_diff = diff; | |
2209 | } | |
2210 | if (!best_diff) | |
2211 | break; | |
2212 | } | |
2213 | avctx->bit_rate = best_br; | |
2214 | s->frame_size_code = best_code << 1; | |
2215 | s->frame_size_min = 2 * ff_ac3_frame_size_tab[s->frame_size_code][s->bit_alloc.sr_code]; | |
2216 | s->num_blks_code = 0x3; | |
2217 | s->num_blocks = 6; | |
2218 | } | |
2219 | s->bit_rate = avctx->bit_rate; | |
2220 | s->frame_size = s->frame_size_min; | |
2221 | ||
2222 | /* validate cutoff */ | |
2223 | if (avctx->cutoff < 0) { | |
2224 | av_log(avctx, AV_LOG_ERROR, "invalid cutoff frequency\n"); | |
2225 | return AVERROR(EINVAL); | |
2226 | } | |
2227 | s->cutoff = avctx->cutoff; | |
2228 | if (s->cutoff > (s->sample_rate >> 1)) | |
2229 | s->cutoff = s->sample_rate >> 1; | |
2230 | ||
2231 | ret = ff_ac3_validate_metadata(s); | |
2232 | if (ret) | |
2233 | return ret; | |
2234 | ||
2235 | s->rematrixing_enabled = s->options.stereo_rematrixing && | |
2236 | (s->channel_mode == AC3_CHMODE_STEREO); | |
2237 | ||
2238 | s->cpl_enabled = s->options.channel_coupling && | |
2239 | s->channel_mode >= AC3_CHMODE_STEREO; | |
2240 | ||
2241 | return 0; | |
2242 | } | |
2243 | ||
2244 | ||
2245 | /* | |
2246 | * Set bandwidth for all channels. | |
2247 | * The user can optionally supply a cutoff frequency. Otherwise an appropriate | |
2248 | * default value will be used. | |
2249 | */ | |
2250 | static av_cold void set_bandwidth(AC3EncodeContext *s) | |
2251 | { | |
2252 | int blk, ch, av_uninit(cpl_start); | |
2253 | ||
2254 | if (s->cutoff) { | |
2255 | /* calculate bandwidth based on user-specified cutoff frequency */ | |
2256 | int fbw_coeffs; | |
2257 | fbw_coeffs = s->cutoff * 2 * AC3_MAX_COEFS / s->sample_rate; | |
2258 | s->bandwidth_code = av_clip((fbw_coeffs - 73) / 3, 0, 60); | |
2259 | } else { | |
2260 | /* use default bandwidth setting */ | |
2261 | s->bandwidth_code = ac3_bandwidth_tab[s->fbw_channels-1][s->bit_alloc.sr_code][s->frame_size_code/2]; | |
2262 | } | |
2263 | ||
2264 | /* set number of coefficients for each channel */ | |
2265 | for (ch = 1; ch <= s->fbw_channels; ch++) { | |
2266 | s->start_freq[ch] = 0; | |
2267 | for (blk = 0; blk < s->num_blocks; blk++) | |
2268 | s->blocks[blk].end_freq[ch] = s->bandwidth_code * 3 + 73; | |
2269 | } | |
2270 | /* LFE channel always has 7 coefs */ | |
2271 | if (s->lfe_on) { | |
2272 | s->start_freq[s->lfe_channel] = 0; | |
2273 | for (blk = 0; blk < s->num_blocks; blk++) | |
2274 | s->blocks[blk].end_freq[ch] = 7; | |
2275 | } | |
2276 | ||
2277 | /* initialize coupling strategy */ | |
2278 | if (s->cpl_enabled) { | |
2279 | if (s->options.cpl_start != AC3ENC_OPT_AUTO) { | |
2280 | cpl_start = s->options.cpl_start; | |
2281 | } else { | |
2282 | cpl_start = ac3_coupling_start_tab[s->channel_mode-2][s->bit_alloc.sr_code][s->frame_size_code/2]; | |
2283 | if (cpl_start < 0) { | |
2284 | if (s->options.channel_coupling == AC3ENC_OPT_AUTO) | |
2285 | s->cpl_enabled = 0; | |
2286 | else | |
2287 | cpl_start = 15; | |
2288 | } | |
2289 | } | |
2290 | } | |
2291 | if (s->cpl_enabled) { | |
2292 | int i, cpl_start_band, cpl_end_band; | |
2293 | uint8_t *cpl_band_sizes = s->cpl_band_sizes; | |
2294 | ||
2295 | cpl_end_band = s->bandwidth_code / 4 + 3; | |
2296 | cpl_start_band = av_clip(cpl_start, 0, FFMIN(cpl_end_band-1, 15)); | |
2297 | ||
2298 | s->num_cpl_subbands = cpl_end_band - cpl_start_band; | |
2299 | ||
2300 | s->num_cpl_bands = 1; | |
2301 | *cpl_band_sizes = 12; | |
2302 | for (i = cpl_start_band + 1; i < cpl_end_band; i++) { | |
2303 | if (ff_eac3_default_cpl_band_struct[i]) { | |
2304 | *cpl_band_sizes += 12; | |
2305 | } else { | |
2306 | s->num_cpl_bands++; | |
2307 | cpl_band_sizes++; | |
2308 | *cpl_band_sizes = 12; | |
2309 | } | |
2310 | } | |
2311 | ||
2312 | s->start_freq[CPL_CH] = cpl_start_band * 12 + 37; | |
2313 | s->cpl_end_freq = cpl_end_band * 12 + 37; | |
2314 | for (blk = 0; blk < s->num_blocks; blk++) | |
2315 | s->blocks[blk].end_freq[CPL_CH] = s->cpl_end_freq; | |
2316 | } | |
2317 | } | |
2318 | ||
2319 | ||
2320 | static av_cold int allocate_buffers(AC3EncodeContext *s) | |
2321 | { | |
2322 | AVCodecContext *avctx = s->avctx; | |
2323 | int blk, ch; | |
2324 | int channels = s->channels + 1; /* includes coupling channel */ | |
2325 | int channel_blocks = channels * s->num_blocks; | |
2326 | int total_coefs = AC3_MAX_COEFS * channel_blocks; | |
2327 | ||
2328 | if (s->allocate_sample_buffers(s)) | |
2329 | goto alloc_fail; | |
2330 | ||
2331 | FF_ALLOC_ARRAY_OR_GOTO(avctx, s->bap_buffer, total_coefs, | |
2332 | sizeof(*s->bap_buffer), alloc_fail); | |
2333 | FF_ALLOC_ARRAY_OR_GOTO(avctx, s->bap1_buffer, total_coefs, | |
2334 | sizeof(*s->bap1_buffer), alloc_fail); | |
2335 | FF_ALLOCZ_ARRAY_OR_GOTO(avctx, s->mdct_coef_buffer, total_coefs, | |
2336 | sizeof(*s->mdct_coef_buffer), alloc_fail); | |
2337 | FF_ALLOC_ARRAY_OR_GOTO(avctx, s->exp_buffer, total_coefs, | |
2338 | sizeof(*s->exp_buffer), alloc_fail); | |
2339 | FF_ALLOC_ARRAY_OR_GOTO(avctx, s->grouped_exp_buffer, channel_blocks, 128 * | |
2340 | sizeof(*s->grouped_exp_buffer), alloc_fail); | |
2341 | FF_ALLOC_ARRAY_OR_GOTO(avctx, s->psd_buffer, total_coefs, | |
2342 | sizeof(*s->psd_buffer), alloc_fail); | |
2343 | FF_ALLOC_ARRAY_OR_GOTO(avctx, s->band_psd_buffer, channel_blocks, 64 * | |
2344 | sizeof(*s->band_psd_buffer), alloc_fail); | |
2345 | FF_ALLOC_ARRAY_OR_GOTO(avctx, s->mask_buffer, channel_blocks, 64 * | |
2346 | sizeof(*s->mask_buffer), alloc_fail); | |
2347 | FF_ALLOC_ARRAY_OR_GOTO(avctx, s->qmant_buffer, total_coefs, | |
2348 | sizeof(*s->qmant_buffer), alloc_fail); | |
2349 | if (s->cpl_enabled) { | |
2350 | FF_ALLOC_ARRAY_OR_GOTO(avctx, s->cpl_coord_exp_buffer, channel_blocks, 16 * | |
2351 | sizeof(*s->cpl_coord_exp_buffer), alloc_fail); | |
2352 | FF_ALLOC_ARRAY_OR_GOTO(avctx, s->cpl_coord_mant_buffer, channel_blocks, 16 * | |
2353 | sizeof(*s->cpl_coord_mant_buffer), alloc_fail); | |
2354 | } | |
2355 | for (blk = 0; blk < s->num_blocks; blk++) { | |
2356 | AC3Block *block = &s->blocks[blk]; | |
2357 | FF_ALLOCZ_ARRAY_OR_GOTO(avctx, block->mdct_coef, channels, sizeof(*block->mdct_coef), | |
2358 | alloc_fail); | |
2359 | FF_ALLOCZ_ARRAY_OR_GOTO(avctx, block->exp, channels, sizeof(*block->exp), | |
2360 | alloc_fail); | |
2361 | FF_ALLOCZ_ARRAY_OR_GOTO(avctx, block->grouped_exp, channels, sizeof(*block->grouped_exp), | |
2362 | alloc_fail); | |
2363 | FF_ALLOCZ_ARRAY_OR_GOTO(avctx, block->psd, channels, sizeof(*block->psd), | |
2364 | alloc_fail); | |
2365 | FF_ALLOCZ_ARRAY_OR_GOTO(avctx, block->band_psd, channels, sizeof(*block->band_psd), | |
2366 | alloc_fail); | |
2367 | FF_ALLOCZ_ARRAY_OR_GOTO(avctx, block->mask, channels, sizeof(*block->mask), | |
2368 | alloc_fail); | |
2369 | FF_ALLOCZ_ARRAY_OR_GOTO(avctx, block->qmant, channels, sizeof(*block->qmant), | |
2370 | alloc_fail); | |
2371 | if (s->cpl_enabled) { | |
2372 | FF_ALLOCZ_ARRAY_OR_GOTO(avctx, block->cpl_coord_exp, channels, sizeof(*block->cpl_coord_exp), | |
2373 | alloc_fail); | |
2374 | FF_ALLOCZ_ARRAY_OR_GOTO(avctx, block->cpl_coord_mant, channels, sizeof(*block->cpl_coord_mant), | |
2375 | alloc_fail); | |
2376 | } | |
2377 | ||
2378 | for (ch = 0; ch < channels; ch++) { | |
2379 | /* arrangement: block, channel, coeff */ | |
2380 | block->grouped_exp[ch] = &s->grouped_exp_buffer[128 * (blk * channels + ch)]; | |
2381 | block->psd[ch] = &s->psd_buffer [AC3_MAX_COEFS * (blk * channels + ch)]; | |
2382 | block->band_psd[ch] = &s->band_psd_buffer [64 * (blk * channels + ch)]; | |
2383 | block->mask[ch] = &s->mask_buffer [64 * (blk * channels + ch)]; | |
2384 | block->qmant[ch] = &s->qmant_buffer [AC3_MAX_COEFS * (blk * channels + ch)]; | |
2385 | if (s->cpl_enabled) { | |
2386 | block->cpl_coord_exp[ch] = &s->cpl_coord_exp_buffer [16 * (blk * channels + ch)]; | |
2387 | block->cpl_coord_mant[ch] = &s->cpl_coord_mant_buffer[16 * (blk * channels + ch)]; | |
2388 | } | |
2389 | ||
2390 | /* arrangement: channel, block, coeff */ | |
2391 | block->exp[ch] = &s->exp_buffer [AC3_MAX_COEFS * (s->num_blocks * ch + blk)]; | |
2392 | block->mdct_coef[ch] = &s->mdct_coef_buffer [AC3_MAX_COEFS * (s->num_blocks * ch + blk)]; | |
2393 | } | |
2394 | } | |
2395 | ||
2396 | if (!s->fixed_point) { | |
2397 | FF_ALLOCZ_ARRAY_OR_GOTO(avctx, s->fixed_coef_buffer, total_coefs, | |
2398 | sizeof(*s->fixed_coef_buffer), alloc_fail); | |
2399 | for (blk = 0; blk < s->num_blocks; blk++) { | |
2400 | AC3Block *block = &s->blocks[blk]; | |
2401 | FF_ALLOCZ_ARRAY_OR_GOTO(avctx, block->fixed_coef, channels, | |
2402 | sizeof(*block->fixed_coef), alloc_fail); | |
2403 | for (ch = 0; ch < channels; ch++) | |
2404 | block->fixed_coef[ch] = &s->fixed_coef_buffer[AC3_MAX_COEFS * (s->num_blocks * ch + blk)]; | |
2405 | } | |
2406 | } else { | |
2407 | for (blk = 0; blk < s->num_blocks; blk++) { | |
2408 | AC3Block *block = &s->blocks[blk]; | |
2409 | FF_ALLOCZ_ARRAY_OR_GOTO(avctx, block->fixed_coef, channels, | |
2410 | sizeof(*block->fixed_coef), alloc_fail); | |
2411 | for (ch = 0; ch < channels; ch++) | |
2412 | block->fixed_coef[ch] = (int32_t *)block->mdct_coef[ch]; | |
2413 | } | |
2414 | } | |
2415 | ||
2416 | return 0; | |
2417 | alloc_fail: | |
2418 | return AVERROR(ENOMEM); | |
2419 | } | |
2420 | ||
2421 | ||
2422 | av_cold int ff_ac3_encode_init(AVCodecContext *avctx) | |
2423 | { | |
2424 | AC3EncodeContext *s = avctx->priv_data; | |
2425 | int ret, frame_size_58; | |
2426 | ||
2427 | s->avctx = avctx; | |
2428 | ||
2429 | s->eac3 = avctx->codec_id == AV_CODEC_ID_EAC3; | |
2430 | ||
2431 | ff_ac3_common_init(); | |
2432 | ||
2433 | ret = validate_options(s); | |
2434 | if (ret) | |
2435 | return ret; | |
2436 | ||
2437 | avctx->frame_size = AC3_BLOCK_SIZE * s->num_blocks; | |
f6fa7814 | 2438 | avctx->initial_padding = AC3_BLOCK_SIZE; |
2ba45a60 DM |
2439 | |
2440 | s->bitstream_mode = avctx->audio_service_type; | |
2441 | if (s->bitstream_mode == AV_AUDIO_SERVICE_TYPE_KARAOKE) | |
2442 | s->bitstream_mode = 0x7; | |
2443 | ||
2444 | s->bits_written = 0; | |
2445 | s->samples_written = 0; | |
2446 | ||
2447 | /* calculate crc_inv for both possible frame sizes */ | |
2448 | frame_size_58 = (( s->frame_size >> 2) + ( s->frame_size >> 4)) << 1; | |
2449 | s->crc_inv[0] = pow_poly((CRC16_POLY >> 1), (8 * frame_size_58) - 16, CRC16_POLY); | |
2450 | if (s->bit_alloc.sr_code == 1) { | |
2451 | frame_size_58 = (((s->frame_size+2) >> 2) + ((s->frame_size+2) >> 4)) << 1; | |
2452 | s->crc_inv[1] = pow_poly((CRC16_POLY >> 1), (8 * frame_size_58) - 16, CRC16_POLY); | |
2453 | } | |
2454 | ||
2455 | /* set function pointers */ | |
2456 | if (CONFIG_AC3_FIXED_ENCODER && s->fixed_point) { | |
2457 | s->mdct_end = ff_ac3_fixed_mdct_end; | |
2458 | s->mdct_init = ff_ac3_fixed_mdct_init; | |
2459 | s->allocate_sample_buffers = ff_ac3_fixed_allocate_sample_buffers; | |
2460 | } else if (CONFIG_AC3_ENCODER || CONFIG_EAC3_ENCODER) { | |
2461 | s->mdct_end = ff_ac3_float_mdct_end; | |
2462 | s->mdct_init = ff_ac3_float_mdct_init; | |
2463 | s->allocate_sample_buffers = ff_ac3_float_allocate_sample_buffers; | |
2464 | } | |
2465 | if (CONFIG_EAC3_ENCODER && s->eac3) | |
2466 | s->output_frame_header = ff_eac3_output_frame_header; | |
2467 | else | |
2468 | s->output_frame_header = ac3_output_frame_header; | |
2469 | ||
2470 | set_bandwidth(s); | |
2471 | ||
2472 | exponent_init(s); | |
2473 | ||
2474 | bit_alloc_init(s); | |
2475 | ||
2476 | ret = s->mdct_init(s); | |
2477 | if (ret) | |
2478 | goto init_fail; | |
2479 | ||
2480 | ret = allocate_buffers(s); | |
2481 | if (ret) | |
2482 | goto init_fail; | |
2483 | ||
2484 | ff_audiodsp_init(&s->adsp); | |
2485 | ff_me_cmp_init(&s->mecc, avctx); | |
2486 | ff_ac3dsp_init(&s->ac3dsp, avctx->flags & CODEC_FLAG_BITEXACT); | |
2487 | ||
2488 | dprint_options(s); | |
2489 | ||
2490 | return 0; | |
2491 | init_fail: | |
2492 | ff_ac3_encode_close(avctx); | |
2493 | return ret; | |
2494 | } |