FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/ac3enc_template.c
Date: 2026-09-27 22:20:00
Exec Total Coverage
Lines: 221 236 93.6%
Functions: 5 5 100.0%
Branches: 147 166 88.6%
Line Branch Exec Source
1 /*
2 * AC-3 encoder float/fixed template
3 * Copyright (c) 2000 Fabrice Bellard
4 * Copyright (c) 2006-2011 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 * AC-3 encoder float/fixed template
27 */
28
29 #include "config_components.h"
30
31 #include <stdint.h>
32
33 #include "libavutil/attributes.h"
34 #include "libavutil/avassert.h"
35 #include "libavutil/mem_internal.h"
36
37 #include "audiodsp.h"
38 #include "ac3enc.h"
39 #include "eac3enc.h"
40
41 #if AC3ENC_FLOAT
42 #define RENAME(element) element ## _float
43 #else
44 #define RENAME(element) element ## _fixed
45 #endif
46
47 /* power ratios for the -42 dB band floor and the 12 dB difference margin. */
48 #define PHASE_BAND_ENERGY_DENOMINATOR (1 << 14)
49 #define PHASE_DIFF_ENERGY_FACTOR (1 << 4)
50
51 /*
52 * Apply the MDCT to input samples to generate frequency coefficients.
53 * This applies the KBD window and normalizes the input to reduce precision
54 * loss due to fixed-point calculations.
55 */
56 1430 static void apply_mdct(AC3EncodeContext *s, uint8_t * const *samples)
57 {
58 av_assert1(s->num_blocks > 0);
59
60
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 3967 for (int ch = 0; ch < s->channels; ch++) {
61 2537 const SampleType *input_samples0 = (const SampleType*)s->planar_samples[ch];
62 /* Reorder channels from native order to AC-3 order. */
63 2537 const SampleType *input_samples1 = (const SampleType*)samples[s->channel_map[ch]];
64 2537 int blk = 0;
65
66 do {
67 15222 AC3Block *block = &s->blocks[blk];
68 15222 SampleType *windowed_samples = s->RENAME(windowed_samples);
69
70 15222 s->fdsp->vector_fmul(windowed_samples, input_samples0,
71 15222 s->RENAME(mdct_window), AC3_BLOCK_SIZE);
72 15222 s->fdsp->vector_fmul_reverse(windowed_samples + AC3_BLOCK_SIZE,
73 input_samples1,
74 15222 s->RENAME(mdct_window), AC3_BLOCK_SIZE);
75
76 15222 s->tx_fn(s->tx, block->mdct_coef[ch+1],
77 windowed_samples, sizeof(*windowed_samples));
78 15222 input_samples0 = input_samples1;
79 15222 input_samples1 += AC3_BLOCK_SIZE;
80
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 15222 } while (++blk < s->num_blocks);
81
82 /* Store last 256 samples of current frame */
83 2537 memcpy(s->planar_samples[ch], input_samples0,
84 AC3_BLOCK_SIZE * sizeof(*input_samples0));
85 }
86 1430 }
87
88
89 /*
90 * Calculate coupling channel and coupling coordinates.
91 */
92 862 static void apply_channel_coupling(AC3EncodeContext *s)
93 {
94 862 LOCAL_ALIGNED_32(CoefType, cpl_coords, [AC3_MAX_BLOCKS], [AC3_MAX_CHANNELS][16]);
95 #if AC3ENC_FLOAT
96 610 LOCAL_ALIGNED_32(int32_t, fixed_cpl_coords, [AC3_MAX_BLOCKS], [AC3_MAX_CHANNELS][16]);
97 #else
98 252 int32_t (*fixed_cpl_coords)[AC3_MAX_CHANNELS][16] = cpl_coords;
99 #endif
100 862 int av_uninit(blk), ch, bnd, i, j;
101 862 CoefSumType energy[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS][16] = {{{0}}};
102 int cpl_start, num_cpl_coefs;
103
104 862 s->phase_flags_in_use = 0;
105 862 memset(cpl_coords, 0, AC3_MAX_BLOCKS * sizeof(*cpl_coords));
106 #if AC3ENC_FLOAT
107 610 memset(fixed_cpl_coords, 0, AC3_MAX_BLOCKS * sizeof(*cpl_coords));
108 #endif
109
110 /* align start to 16-byte boundary. align length to multiple of 32.
111 note: coupling start bin % 4 will always be 1 */
112 862 cpl_start = s->start_freq[CPL_CH] - 1;
113 862 num_cpl_coefs = FFALIGN(s->num_cpl_subbands * 12 + 1, 32);
114 862 cpl_start = FFMIN(256, cpl_start + num_cpl_coefs) - num_cpl_coefs;
115
116
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 862 if (s->channel_mode == AC3_CHMODE_STEREO) {
117 uint8_t phase_flags[AC3_MAX_CPL_BANDS];
118 844 int cpl_blocks = 0;
119
120 /* use a single phase strategy for the frame. a difference carrier is
121 * selected only when it has at least 12 dB more energy and the band
122 * is within 42 dB of the coded channel energy in every coupling
123 * block. */
124 844 memset(phase_flags, 1, s->num_cpl_bands);
125
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 5908 for (blk = 0; blk < s->num_blocks; blk++) {
126 5064 AC3Block *block = &s->blocks[blk];
127 CoefSumType sum[AC3_MAX_CPL_BANDS][4];
128 /* the DSP also returns sum and difference energy in slots 2/3. */
129 CoefSumType block_energy[4];
130 CoefSumType max_energy;
131
132
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 5064 if (!block->cpl_in_use)
133 ✗ continue;
134 5064 cpl_blocks++;
135 5064 sum_square_butterfly(s, block_energy,
136 5064 block->mdct_coef[1], block->mdct_coef[2],
137 s->start_freq[CPL_CH]);
138 5064 i = s->start_freq[CPL_CH];
139
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 26700 for (bnd = 0; bnd < s->num_cpl_bands; bnd++) {
140 21636 sum_square_butterfly(s, sum[bnd],
141 21636 block->mdct_coef[1] + i,
142 21636 block->mdct_coef[2] + i,
143 21636 s->cpl_band_sizes[bnd]);
144 /* reused by the coupling coordinate calculation below. */
145 21636 energy[blk][1][bnd] = sum[bnd][0];
146 21636 energy[blk][2][bnd] = sum[bnd][1];
147 21636 block_energy[0] += sum[bnd][0];
148 21636 block_energy[1] += sum[bnd][1];
149 21636 i += s->cpl_band_sizes[bnd];
150 }
151
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 5064 max_energy = FFMAX(block_energy[0], block_energy[1]);
152
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 26700 for (bnd = 0; bnd < s->num_cpl_bands; bnd++) {
153
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 21636 CoefSumType band_energy = FFMAX(sum[bnd][0], sum[bnd][1]);
154 21636 int significant = band_energy >
155 21636 max_energy / PHASE_BAND_ENERGY_DENOMINATOR;
156
157
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 36059 phase_flags[bnd] &= significant &&
158
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 14423 sum[bnd][3] / PHASE_DIFF_ENERGY_FACTOR > sum[bnd][2];
159 }
160 }
161
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 4450 for (bnd = 0; bnd < s->num_cpl_bands; bnd++) {
162
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 3606 int phase = phase_flags[bnd] && cpl_blocks;
163
164 3606 s->phase_flags[bnd] = phase;
165 3606 s->phase_flags_in_use |= phase;
166 }
167 }
168
169 /* calculate coupling channel from fbw channels */
170
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 6034 for (blk = 0; blk < s->num_blocks; blk++) {
171 5172 AC3Block *block = &s->blocks[blk];
172 5172 CoefType *cpl_coef = &block->mdct_coef[CPL_CH][cpl_start];
173
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 5172 if (!block->cpl_in_use)
174 ✗ continue;
175 5172 memset(cpl_coef, 0, num_cpl_coefs * sizeof(*cpl_coef));
176
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 15840 for (ch = 1; ch <= s->fbw_channels; ch++) {
177 10668 CoefType *ch_coef = &block->mdct_coef[ch][cpl_start];
178
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 10668 if (!block->channel_in_cpl[ch])
179 ✗ continue;
180
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 778284 for (i = 0; i < num_cpl_coefs; i++)
181 767616 cpl_coef[i] += ch_coef[i];
182 }
183
184
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 5172 if (s->channel_mode == AC3_CHMODE_STEREO) {
185 5064 CoefType *left = block->mdct_coef[1];
186 5064 CoefType *right = block->mdct_coef[2];
187
188 5064 i = s->start_freq[CPL_CH];
189
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 26700 for (bnd = 0; bnd < s->num_cpl_bands; bnd++) {
190
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 21636 if (s->phase_flags[bnd]) {
191
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 42966 for (j = 0; j < s->cpl_band_sizes[bnd]; j++)
192 40176 block->mdct_coef[CPL_CH][i + j] = left[i + j] - right[i + j];
193 }
194 21636 i += s->cpl_band_sizes[bnd];
195 }
196 }
197
198 /* coefficients must be clipped in order to be encoded */
199 5172 clip_coefficients(&s->adsp, cpl_coef, num_cpl_coefs);
200 }
201
202 /* calculate energy in each band in coupling channel and each fbw channel */
203 /* TODO: possibly use SIMD to speed up energy calculation */
204 862 bnd = 0;
205 862 i = s->start_freq[CPL_CH];
206
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 4504 while (i < s->cpl_end_freq) {
207 3642 int band_size = s->cpl_band_sizes[bnd];
208 /* stereo channel energies were filled during phase analysis above. */
209 7284 int last_ch = s->channel_mode == AC3_CHMODE_STEREO ?
210
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 3642 CPL_CH : s->fbw_channels;
211
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 7464 for (ch = CPL_CH; ch <= last_ch; ch++) {
212
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 26754 for (blk = 0; blk < s->num_blocks; blk++) {
213 22932 AC3Block *block = &s->blocks[blk];
214
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 22932 if (!block->cpl_in_use || (ch > CPL_CH && !block->channel_in_cpl[ch]))
215 ✗ continue;
216
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 375012 for (j = 0; j < band_size; j++) {
217 352080 CoefType v = block->mdct_coef[ch][i+j];
218 352080 MAC_COEF(energy[blk][ch][bnd], v, v);
219 }
220 }
221 }
222 3642 i += band_size;
223 3642 bnd++;
224 }
225
226 /* calculate coupling coordinates for all blocks for all channels */
227
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 6034 for (blk = 0; blk < s->num_blocks; blk++) {
228 5172 AC3Block *block = &s->blocks[blk];
229
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 5172 if (!block->cpl_in_use)
230 ✗ continue;
231
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 15840 for (ch = 1; ch <= s->fbw_channels; ch++) {
232
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 10668 if (!block->channel_in_cpl[ch])
233 ✗ continue;
234
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 55020 for (bnd = 0; bnd < s->num_cpl_bands; bnd++) {
235 44352 cpl_coords[blk][ch][bnd] = calc_cpl_coord(energy[blk][ch][bnd],
236 energy[blk][CPL_CH][bnd]);
237 }
238 }
239 }
240
241 /* determine which blocks to send new coupling coordinates for */
242
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 6034 for (blk = 0; blk < s->num_blocks; blk++) {
243 5172 AC3Block *block = &s->blocks[blk];
244
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 5172 AC3Block *block0 = blk ? &s->blocks[blk-1] : NULL;
245
246 5172 memset(block->new_cpl_coords, 0, sizeof(block->new_cpl_coords));
247
248
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 5172 if (block->cpl_in_use) {
249 /* send new coordinates if this is the first block, if previous
250 * block did not use coupling but this block does, the channels
251 * using coupling has changed from the previous block, or the
252 * coordinate difference from the last block for any channel is
253 * greater than a threshold value. */
254
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 5172 if (blk == 0 || !block0->cpl_in_use) {
255
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 2640 for (ch = 1; ch <= s->fbw_channels; ch++)
256 1778 block->new_cpl_coords[ch] = 1;
257 } else {
258
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 13200 for (ch = 1; ch <= s->fbw_channels; ch++) {
259
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 8890 if (!block->channel_in_cpl[ch])
260 ✗ continue;
261
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 8890 if (!block0->channel_in_cpl[ch]) {
262 ✗ block->new_cpl_coords[ch] = 1;
263 } else {
264 8890 CoefSumType coord_diff = 0;
265
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 45850 for (bnd = 0; bnd < s->num_cpl_bands; bnd++) {
266
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 36960 coord_diff += FFABS(cpl_coords[blk-1][ch][bnd] -
267 cpl_coords[blk ][ch][bnd]);
268 }
269 8890 coord_diff /= s->num_cpl_bands;
270
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 8890 if (coord_diff > NEW_CPL_COORD_THRESHOLD)
271 48 block->new_cpl_coords[ch] = 1;
272 }
273 }
274 }
275 }
276 }
277
278 av_assert1(s->fbw_channels > 0);
279
280 /* calculate final coupling coordinates, taking into account reusing of
281 coordinates in successive blocks */
282
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 4504 for (bnd = 0; bnd < s->num_cpl_bands; bnd++) {
283 3642 blk = 0;
284
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 7376 while (blk < s->num_blocks) {
285 3734 int av_uninit(blk1);
286 3734 AC3Block *block = &s->blocks[blk];
287
288
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 3734 if (!block->cpl_in_use) {
289 ✗ blk++;
290 ✗ continue;
291 }
292
293
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 11322 for (ch = 1; ch <= s->fbw_channels; ch++) {
294 CoefSumType energy_ch, energy_cpl;
295
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 7588 if (!block->channel_in_cpl[ch])
296 ✗ continue;
297 7588 energy_cpl = energy[blk][CPL_CH][bnd];
298 7588 energy_ch = energy[blk][ch][bnd];
299 7588 blk1 = blk+1;
300
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 44476 while (blk1 < s->num_blocks && !s->blocks[blk1].new_cpl_coords[ch]) {
301
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 36888 if (s->blocks[blk1].cpl_in_use) {
302 36888 energy_cpl += energy[blk1][CPL_CH][bnd];
303 36888 energy_ch += energy[blk1][ch][bnd];
304 }
305 36888 blk1++;
306 }
307 7588 cpl_coords[blk][ch][bnd] = calc_cpl_coord(energy_ch, energy_cpl);
308 }
309 3734 blk = blk1;
310 }
311 }
312
313 /* calculate exponents/mantissas for coupling coordinates */
314
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 6034 for (blk = 0; blk < s->num_blocks; blk++) {
315 5172 AC3Block *block = &s->blocks[blk];
316
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 5172 if (!block->cpl_in_use)
317 ✗ continue;
318
319 #if AC3ENC_FLOAT
320 3660 s->ac3dsp.float_to_fixed24(fixed_cpl_coords[blk][1],
321 3660 cpl_coords[blk][1],
322 3660 s->fbw_channels * 16);
323 #endif
324 5172 s->ac3dsp.extract_exponents(block->cpl_coord_exp[1],
325 5172 fixed_cpl_coords[blk][1],
326 5172 s->fbw_channels * 16);
327
328
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 15840 for (ch = 1; ch <= s->fbw_channels; ch++) {
329 int bnd, min_exp, max_exp, master_exp;
330
331
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 10668 if (!block->new_cpl_coords[ch])
332 8842 continue;
333
334 /* determine master exponent */
335 1826 min_exp = max_exp = block->cpl_coord_exp[ch][0];
336
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 7552 for (bnd = 1; bnd < s->num_cpl_bands; bnd++) {
337 5726 int exp = block->cpl_coord_exp[ch][bnd];
338 5726 min_exp = FFMIN(exp, min_exp);
339 5726 max_exp = FFMAX(exp, max_exp);
340 }
341 1826 master_exp = ((max_exp - 15) + 2) / 3;
342 1826 master_exp = FFMAX(master_exp, 0);
343
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 1826 while (min_exp < master_exp * 3)
344 ✗ master_exp--;
345
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 9378 for (bnd = 0; bnd < s->num_cpl_bands; bnd++) {
346 7552 block->cpl_coord_exp[ch][bnd] = av_clip(block->cpl_coord_exp[ch][bnd] -
347 7552 master_exp * 3, 0, 15);
348 }
349 1826 block->cpl_master_exp[ch] = master_exp;
350
351 /* quantize mantissas */
352
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 9378 for (bnd = 0; bnd < s->num_cpl_bands; bnd++) {
353 7552 int cpl_exp = block->cpl_coord_exp[ch][bnd];
354 7552 int cpl_mant = (fixed_cpl_coords[blk][ch][bnd] << (5 + cpl_exp + master_exp * 3)) >> 24;
355
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 7552 if (cpl_exp == 15)
356 ✗ cpl_mant >>= 1;
357 else
358 7552 cpl_mant -= 16;
359
360 7552 block->cpl_coord_mant[ch][bnd] = cpl_mant;
361 }
362 }
363 }
364
365
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 610 if (AC3ENC_FLOAT && CONFIG_EAC3_ENCODER && s->eac3)
366 305 ff_eac3_set_cpl_states(s);
367 862 }
368
369
370 /*
371 * Determine rematrixing flags for each block and band.
372 */
373 1430 static void compute_rematrixing_strategy(AC3EncodeContext *s)
374 {
375 int nb_coefs;
376 int blk, bnd;
377 1430 AC3Block *block, *block0 = NULL;
378
379
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 1430 if (s->channel_mode != AC3_CHMODE_STEREO)
380 413 return;
381
382
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 7119 for (blk = 0; blk < s->num_blocks; blk++) {
383 6102 block = &s->blocks[blk];
384 6102 block->new_rematrixing_strategy = !blk;
385
386 6102 block->num_rematrixing_bands = 4;
387
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 6102 if (block->cpl_in_use) {
388 5064 block->num_rematrixing_bands -= (s->start_freq[CPL_CH] <= 61);
389 5064 block->num_rematrixing_bands -= (s->start_freq[CPL_CH] == 37);
390
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 5064 if (blk && block->num_rematrixing_bands != block0->num_rematrixing_bands)
391 ✗ block->new_rematrixing_strategy = 1;
392 }
393 6102 nb_coefs = FFMIN(block->end_freq[1], block->end_freq[2]);
394
395
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 6102 if (!s->rematrixing_enabled) {
396 1038 block0 = block;
397 1038 continue;
398 }
399
400
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 24744 for (bnd = 0; bnd < block->num_rematrixing_bands; bnd++) {
401 /* calculate sum of squared coeffs for one band in one block */
402 19680 int start = ff_ac3_rematrix_band_tab[bnd];
403 19680 int end = FFMIN(nb_coefs, ff_ac3_rematrix_band_tab[bnd+1]);
404 CoefSumType sum[4];
405 19680 sum_square_butterfly(s, sum, block->mdct_coef[1] + start,
406 19680 block->mdct_coef[2] + start, end - start);
407
408 /* compare sums to determine if rematrixing will be used for this band */
409
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 19680 if (FFMIN(sum[2], sum[3]) < FFMIN(sum[0], sum[1]))
410 11248 block->rematrixing_flags[bnd] = 1;
411 else
412 8432 block->rematrixing_flags[bnd] = 0;
413
414 /* determine if new rematrixing flags will be sent */
415
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 19680 if (blk &&
416
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 16400 block->rematrixing_flags[bnd] != block0->rematrixing_flags[bnd]) {
417 1895 block->new_rematrixing_strategy = 1;
418 }
419 }
420 5064 block0 = block;
421 }
422 }
423
424 16 static void copy_input_samples(AC3EncodeContext *s, const AVFrame *frame)
425 {
426
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 16 int end = frame ? frame->nb_samples : 0;
427
428 /* copy new samples and zero any remaining samples */
429
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 16 if (frame) {
430 12 av_samples_copy(s->input_samples, frame->extended_data, 0, 0,
431 12 frame->nb_samples, s->channels,
432 12 s->avctx->sample_fmt);
433 }
434 16 av_samples_set_silence(s->input_samples, end,
435 16 s->avctx->frame_size - end,
436 16 s->channels, s->avctx->sample_fmt);
437 16 }
438
439 1430 static void encode_frame(AC3EncodeContext *s, const AVFrame *frame)
440 {
441 uint8_t **samples;
442
443
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 1430 if (!frame || frame->nb_samples < s->avctx->frame_size) {
444 16 copy_input_samples(s, frame);
445 16 samples = s->input_samples;
446 } else
447 1414 samples = frame->extended_data;
448
449 1430 apply_mdct(s, samples);
450
451 1430 s->cpl_on = s->cpl_enabled;
452 1430 ff_ac3_compute_coupling_strategy(s);
453
454
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 1430 if (s->cpl_on)
455 862 apply_channel_coupling(s);
456
457 1430 compute_rematrixing_strategy(s);
458
459 #if AC3ENC_FLOAT
460 610 scale_coefficients(s);
461 #endif
462 1430 }
463