Directory: | ../../../ffmpeg/ |
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File: | src/libavcodec/ac3enc_template.c |
Date: | 2022-07-04 19:11:22 |
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Lines: | 176 | 197 | 89.3% |
Branches: | 115 | 142 | 81.0% |
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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/internal.h" | ||
35 | #include "libavutil/mem_internal.h" | ||
36 | |||
37 | #include "audiodsp.h" | ||
38 | #include "ac3enc.h" | ||
39 | #include "eac3enc.h" | ||
40 | |||
41 | |||
42 | 10 | static int allocate_sample_buffers(AC3EncodeContext *s) | |
43 | { | ||
44 | int ch; | ||
45 | |||
46 |
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10 | if (!FF_ALLOC_TYPED_ARRAY(s->windowed_samples, AC3_WINDOW_SIZE) || |
47 |
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10 | !FF_ALLOCZ_TYPED_ARRAY(s->planar_samples, s->channels)) |
48 | ✗ | return AVERROR(ENOMEM); | |
49 | |||
50 |
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23 | for (ch = 0; ch < s->channels; ch++) { |
51 |
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13 | if (!(s->planar_samples[ch] = av_mallocz((AC3_FRAME_SIZE + AC3_BLOCK_SIZE) * |
52 | sizeof(**s->planar_samples)))) | ||
53 | ✗ | return AVERROR(ENOMEM); | |
54 | } | ||
55 | 10 | return 0; | |
56 | } | ||
57 | |||
58 | |||
59 | /* | ||
60 | * Copy input samples. | ||
61 | * Channels are reordered from FFmpeg's default order to AC-3 order. | ||
62 | */ | ||
63 | 1200 | static void copy_input_samples(AC3EncodeContext *s, SampleType **samples) | |
64 | { | ||
65 | int ch; | ||
66 | |||
67 | /* copy and remap input samples */ | ||
68 |
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3119 | for (ch = 0; ch < s->channels; ch++) { |
69 | /* copy last 256 samples of previous frame to the start of the current frame */ | ||
70 | 1919 | memcpy(&s->planar_samples[ch][0], &s->planar_samples[ch][AC3_BLOCK_SIZE * s->num_blocks], | |
71 | AC3_BLOCK_SIZE * sizeof(s->planar_samples[0][0])); | ||
72 | |||
73 | /* copy new samples for current frame */ | ||
74 | 1919 | memcpy(&s->planar_samples[ch][AC3_BLOCK_SIZE], | |
75 | 1919 | samples[s->channel_map[ch]], | |
76 | 1919 | AC3_BLOCK_SIZE * s->num_blocks * sizeof(s->planar_samples[0][0])); | |
77 | } | ||
78 | 1200 | } | |
79 | |||
80 | |||
81 | /* | ||
82 | * Apply the MDCT to input samples to generate frequency coefficients. | ||
83 | * This applies the KBD window and normalizes the input to reduce precision | ||
84 | * loss due to fixed-point calculations. | ||
85 | */ | ||
86 | 1200 | static void apply_mdct(AC3EncodeContext *s) | |
87 | { | ||
88 | int blk, ch; | ||
89 | |||
90 |
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3119 | for (ch = 0; ch < s->channels; ch++) { |
91 |
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13433 | for (blk = 0; blk < s->num_blocks; blk++) { |
92 | 11514 | AC3Block *block = &s->blocks[blk]; | |
93 | 11514 | const SampleType *input_samples = &s->planar_samples[ch][blk * AC3_BLOCK_SIZE]; | |
94 | |||
95 | 11514 | s->fdsp->vector_fmul(s->windowed_samples, input_samples, | |
96 | 11514 | s->mdct_window, AC3_BLOCK_SIZE); | |
97 | 11514 | s->fdsp->vector_fmul_reverse(s->windowed_samples + AC3_BLOCK_SIZE, | |
98 | 11514 | &input_samples[AC3_BLOCK_SIZE], | |
99 | 11514 | s->mdct_window, AC3_BLOCK_SIZE); | |
100 | |||
101 | 11514 | s->mdct.mdct_calc(&s->mdct, block->mdct_coef[ch+1], | |
102 | 11514 | s->windowed_samples); | |
103 | } | ||
104 | } | ||
105 | 1200 | } | |
106 | |||
107 | |||
108 | /* | ||
109 | * Calculate coupling channel and coupling coordinates. | ||
110 | */ | ||
111 | 719 | static void apply_channel_coupling(AC3EncodeContext *s) | |
112 | { | ||
113 | 719 | LOCAL_ALIGNED_16(CoefType, cpl_coords, [AC3_MAX_BLOCKS], [AC3_MAX_CHANNELS][16]); | |
114 | #if AC3ENC_FLOAT | ||
115 | 546 | LOCAL_ALIGNED_16(int32_t, fixed_cpl_coords, [AC3_MAX_BLOCKS], [AC3_MAX_CHANNELS][16]); | |
116 | #else | ||
117 | 173 | int32_t (*fixed_cpl_coords)[AC3_MAX_CHANNELS][16] = cpl_coords; | |
118 | #endif | ||
119 | 719 | int av_uninit(blk), ch, bnd, i, j; | |
120 | 719 | CoefSumType energy[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS][16] = {{{0}}}; | |
121 | int cpl_start, num_cpl_coefs; | ||
122 | |||
123 | 719 | memset(cpl_coords, 0, AC3_MAX_BLOCKS * sizeof(*cpl_coords)); | |
124 | #if AC3ENC_FLOAT | ||
125 | 546 | memset(fixed_cpl_coords, 0, AC3_MAX_BLOCKS * sizeof(*cpl_coords)); | |
126 | #endif | ||
127 | |||
128 | /* align start to 16-byte boundary. align length to multiple of 32. | ||
129 | note: coupling start bin % 4 will always be 1 */ | ||
130 | 719 | cpl_start = s->start_freq[CPL_CH] - 1; | |
131 | 719 | num_cpl_coefs = FFALIGN(s->num_cpl_subbands * 12 + 1, 32); | |
132 | 719 | cpl_start = FFMIN(256, cpl_start + num_cpl_coefs) - num_cpl_coefs; | |
133 | |||
134 | /* calculate coupling channel from fbw channels */ | ||
135 |
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5033 | for (blk = 0; blk < s->num_blocks; blk++) { |
136 | 4314 | AC3Block *block = &s->blocks[blk]; | |
137 | 4314 | CoefType *cpl_coef = &block->mdct_coef[CPL_CH][cpl_start]; | |
138 |
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4314 | if (!block->cpl_in_use) |
139 | ✗ | continue; | |
140 | 4314 | memset(cpl_coef, 0, num_cpl_coefs * sizeof(*cpl_coef)); | |
141 |
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12942 | for (ch = 1; ch <= s->fbw_channels; ch++) { |
142 | 8628 | CoefType *ch_coef = &block->mdct_coef[ch][cpl_start]; | |
143 |
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8628 | if (!block->channel_in_cpl[ch]) |
144 | ✗ | continue; | |
145 |
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560820 | for (i = 0; i < num_cpl_coefs; i++) |
146 | 552192 | cpl_coef[i] += ch_coef[i]; | |
147 | } | ||
148 | |||
149 | /* coefficients must be clipped in order to be encoded */ | ||
150 | 4314 | clip_coefficients(&s->adsp, cpl_coef, num_cpl_coefs); | |
151 | } | ||
152 | |||
153 | /* calculate energy in each band in coupling channel and each fbw channel */ | ||
154 | /* TODO: possibly use SIMD to speed up energy calculation */ | ||
155 | 719 | bnd = 0; | |
156 | 719 | i = s->start_freq[CPL_CH]; | |
157 |
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3595 | while (i < s->cpl_end_freq) { |
158 | 2876 | int band_size = s->cpl_band_sizes[bnd]; | |
159 |
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11504 | for (ch = CPL_CH; ch <= s->fbw_channels; ch++) { |
160 |
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60396 | for (blk = 0; blk < s->num_blocks; blk++) { |
161 | 51768 | AC3Block *block = &s->blocks[blk]; | |
162 |
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51768 | if (!block->cpl_in_use || (ch > CPL_CH && !block->channel_in_cpl[ch])) |
163 | ✗ | continue; | |
164 |
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828288 | for (j = 0; j < band_size; j++) { |
165 | 776520 | CoefType v = block->mdct_coef[ch][i+j]; | |
166 | 776520 | MAC_COEF(energy[blk][ch][bnd], v, v); | |
167 | } | ||
168 | } | ||
169 | } | ||
170 | 2876 | i += band_size; | |
171 | 2876 | bnd++; | |
172 | } | ||
173 | |||
174 | /* calculate coupling coordinates for all blocks for all channels */ | ||
175 |
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5033 | for (blk = 0; blk < s->num_blocks; blk++) { |
176 | 4314 | AC3Block *block = &s->blocks[blk]; | |
177 |
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4314 | if (!block->cpl_in_use) |
178 | ✗ | continue; | |
179 |
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12942 | for (ch = 1; ch <= s->fbw_channels; ch++) { |
180 |
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8628 | if (!block->channel_in_cpl[ch]) |
181 | ✗ | continue; | |
182 |
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43140 | for (bnd = 0; bnd < s->num_cpl_bands; bnd++) { |
183 | 34512 | cpl_coords[blk][ch][bnd] = calc_cpl_coord(energy[blk][ch][bnd], | |
184 | energy[blk][CPL_CH][bnd]); | ||
185 | } | ||
186 | } | ||
187 | } | ||
188 | |||
189 | /* determine which blocks to send new coupling coordinates for */ | ||
190 |
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5033 | for (blk = 0; blk < s->num_blocks; blk++) { |
191 | 4314 | AC3Block *block = &s->blocks[blk]; | |
192 |
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4314 | AC3Block *block0 = blk ? &s->blocks[blk-1] : NULL; |
193 | |||
194 | 4314 | memset(block->new_cpl_coords, 0, sizeof(block->new_cpl_coords)); | |
195 | |||
196 |
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4314 | if (block->cpl_in_use) { |
197 | /* send new coordinates if this is the first block, if previous | ||
198 | * block did not use coupling but this block does, the channels | ||
199 | * using coupling has changed from the previous block, or the | ||
200 | * coordinate difference from the last block for any channel is | ||
201 | * greater than a threshold value. */ | ||
202 |
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4314 | if (blk == 0 || !block0->cpl_in_use) { |
203 |
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2157 | for (ch = 1; ch <= s->fbw_channels; ch++) |
204 | 1438 | block->new_cpl_coords[ch] = 1; | |
205 | } else { | ||
206 |
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10785 | for (ch = 1; ch <= s->fbw_channels; ch++) { |
207 |
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7190 | if (!block->channel_in_cpl[ch]) |
208 | ✗ | continue; | |
209 |
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7190 | if (!block0->channel_in_cpl[ch]) { |
210 | ✗ | block->new_cpl_coords[ch] = 1; | |
211 | } else { | ||
212 | 7190 | CoefSumType coord_diff = 0; | |
213 |
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35950 | for (bnd = 0; bnd < s->num_cpl_bands; bnd++) { |
214 |
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28760 | coord_diff += FFABS(cpl_coords[blk-1][ch][bnd] - |
215 | cpl_coords[blk ][ch][bnd]); | ||
216 | } | ||
217 | 7190 | coord_diff /= s->num_cpl_bands; | |
218 |
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7190 | if (coord_diff > NEW_CPL_COORD_THRESHOLD) |
219 | 32 | block->new_cpl_coords[ch] = 1; | |
220 | } | ||
221 | } | ||
222 | } | ||
223 | } | ||
224 | } | ||
225 | |||
226 | /* calculate final coupling coordinates, taking into account reusing of | ||
227 | coordinates in successive blocks */ | ||
228 |
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3595 | for (bnd = 0; bnd < s->num_cpl_bands; bnd++) { |
229 | 2876 | blk = 0; | |
230 |
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5840 | while (blk < s->num_blocks) { |
231 | 2964 | int av_uninit(blk1); | |
232 | 2964 | AC3Block *block = &s->blocks[blk]; | |
233 | |||
234 |
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2964 | if (!block->cpl_in_use) { |
235 | ✗ | blk++; | |
236 | ✗ | continue; | |
237 | } | ||
238 | |||
239 |
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8892 | for (ch = 1; ch <= s->fbw_channels; ch++) { |
240 | CoefSumType energy_ch, energy_cpl; | ||
241 |
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5928 | if (!block->channel_in_cpl[ch]) |
242 | ✗ | continue; | |
243 | 5928 | energy_cpl = energy[blk][CPL_CH][bnd]; | |
244 | 5928 | energy_ch = energy[blk][ch][bnd]; | |
245 | 5928 | blk1 = blk+1; | |
246 |
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34696 | while (blk1 < s->num_blocks && !s->blocks[blk1].new_cpl_coords[ch]) { |
247 |
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28768 | if (s->blocks[blk1].cpl_in_use) { |
248 | 28768 | energy_cpl += energy[blk1][CPL_CH][bnd]; | |
249 | 28768 | energy_ch += energy[blk1][ch][bnd]; | |
250 | } | ||
251 | 28768 | blk1++; | |
252 | } | ||
253 | 5928 | cpl_coords[blk][ch][bnd] = calc_cpl_coord(energy_ch, energy_cpl); | |
254 | } | ||
255 | 2964 | blk = blk1; | |
256 | } | ||
257 | } | ||
258 | |||
259 | /* calculate exponents/mantissas for coupling coordinates */ | ||
260 |
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5033 | for (blk = 0; blk < s->num_blocks; blk++) { |
261 | 4314 | AC3Block *block = &s->blocks[blk]; | |
262 |
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4314 | if (!block->cpl_in_use) |
263 | ✗ | continue; | |
264 | |||
265 | #if AC3ENC_FLOAT | ||
266 | 3276 | s->ac3dsp.float_to_fixed24(fixed_cpl_coords[blk][1], | |
267 | 3276 | cpl_coords[blk][1], | |
268 | 3276 | s->fbw_channels * 16); | |
269 | #endif | ||
270 | 4314 | s->ac3dsp.extract_exponents(block->cpl_coord_exp[1], | |
271 | 4314 | fixed_cpl_coords[blk][1], | |
272 | 4314 | s->fbw_channels * 16); | |
273 | |||
274 |
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12942 | for (ch = 1; ch <= s->fbw_channels; ch++) { |
275 | int bnd, min_exp, max_exp, master_exp; | ||
276 | |||
277 |
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8628 | if (!block->new_cpl_coords[ch]) |
278 | 7158 | continue; | |
279 | |||
280 | /* determine master exponent */ | ||
281 | 1470 | min_exp = max_exp = block->cpl_coord_exp[ch][0]; | |
282 |
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5880 | for (bnd = 1; bnd < s->num_cpl_bands; bnd++) { |
283 | 4410 | int exp = block->cpl_coord_exp[ch][bnd]; | |
284 | 4410 | min_exp = FFMIN(exp, min_exp); | |
285 | 4410 | max_exp = FFMAX(exp, max_exp); | |
286 | } | ||
287 | 1470 | master_exp = ((max_exp - 15) + 2) / 3; | |
288 | 1470 | master_exp = FFMAX(master_exp, 0); | |
289 |
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1470 | while (min_exp < master_exp * 3) |
290 | ✗ | master_exp--; | |
291 |
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7350 | for (bnd = 0; bnd < s->num_cpl_bands; bnd++) { |
292 | 5880 | block->cpl_coord_exp[ch][bnd] = av_clip(block->cpl_coord_exp[ch][bnd] - | |
293 | 5880 | master_exp * 3, 0, 15); | |
294 | } | ||
295 | 1470 | block->cpl_master_exp[ch] = master_exp; | |
296 | |||
297 | /* quantize mantissas */ | ||
298 |
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7350 | for (bnd = 0; bnd < s->num_cpl_bands; bnd++) { |
299 | 5880 | int cpl_exp = block->cpl_coord_exp[ch][bnd]; | |
300 | 5880 | int cpl_mant = (fixed_cpl_coords[blk][ch][bnd] << (5 + cpl_exp + master_exp * 3)) >> 24; | |
301 |
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5880 | if (cpl_exp == 15) |
302 | ✗ | cpl_mant >>= 1; | |
303 | else | ||
304 | 5880 | cpl_mant -= 16; | |
305 | |||
306 | 5880 | block->cpl_coord_mant[ch][bnd] = cpl_mant; | |
307 | } | ||
308 | } | ||
309 | } | ||
310 | |||
311 |
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546 | if (AC3ENC_FLOAT && CONFIG_EAC3_ENCODER && s->eac3) |
312 | 273 | ff_eac3_set_cpl_states(s); | |
313 | 719 | } | |
314 | |||
315 | |||
316 | /* | ||
317 | * Determine rematrixing flags for each block and band. | ||
318 | */ | ||
319 | 1200 | static void compute_rematrixing_strategy(AC3EncodeContext *s) | |
320 | { | ||
321 | int nb_coefs; | ||
322 | int blk, bnd; | ||
323 | 1200 | AC3Block *block, *block0 = NULL; | |
324 | |||
325 |
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1200 | if (s->channel_mode != AC3_CHMODE_STEREO) |
326 | 481 | return; | |
327 | |||
328 |
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5033 | for (blk = 0; blk < s->num_blocks; blk++) { |
329 | 4314 | block = &s->blocks[blk]; | |
330 | 4314 | block->new_rematrixing_strategy = !blk; | |
331 | |||
332 | 4314 | block->num_rematrixing_bands = 4; | |
333 |
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4314 | if (block->cpl_in_use) { |
334 | 4314 | block->num_rematrixing_bands -= (s->start_freq[CPL_CH] <= 61); | |
335 | 4314 | block->num_rematrixing_bands -= (s->start_freq[CPL_CH] == 37); | |
336 |
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4314 | if (blk && block->num_rematrixing_bands != block0->num_rematrixing_bands) |
337 | ✗ | block->new_rematrixing_strategy = 1; | |
338 | } | ||
339 | 4314 | nb_coefs = FFMIN(block->end_freq[1], block->end_freq[2]); | |
340 | |||
341 |
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4314 | if (!s->rematrixing_enabled) { |
342 | ✗ | block0 = block; | |
343 | ✗ | continue; | |
344 | } | ||
345 | |||
346 |
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21570 | for (bnd = 0; bnd < block->num_rematrixing_bands; bnd++) { |
347 | /* calculate sum of squared coeffs for one band in one block */ | ||
348 | 17256 | int start = ff_ac3_rematrix_band_tab[bnd]; | |
349 | 17256 | int end = FFMIN(nb_coefs, ff_ac3_rematrix_band_tab[bnd+1]); | |
350 | CoefSumType sum[4]; | ||
351 | 17256 | sum_square_butterfly(s, sum, block->mdct_coef[1] + start, | |
352 | 17256 | block->mdct_coef[2] + start, end - start); | |
353 | |||
354 | /* compare sums to determine if rematrixing will be used for this band */ | ||
355 |
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17256 | if (FFMIN(sum[2], sum[3]) < FFMIN(sum[0], sum[1])) |
356 | 9547 | block->rematrixing_flags[bnd] = 1; | |
357 | else | ||
358 | 7709 | block->rematrixing_flags[bnd] = 0; | |
359 | |||
360 | /* determine if new rematrixing flags will be sent */ | ||
361 |
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17256 | if (blk && |
362 |
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14380 | block->rematrixing_flags[bnd] != block0->rematrixing_flags[bnd]) { |
363 | 1886 | block->new_rematrixing_strategy = 1; | |
364 | } | ||
365 | } | ||
366 | 4314 | block0 = block; | |
367 | } | ||
368 | } | ||
369 | |||
370 | |||
371 | 1200 | int AC3_NAME(encode_frame)(AVCodecContext *avctx, AVPacket *avpkt, | |
372 | const AVFrame *frame, int *got_packet_ptr) | ||
373 | { | ||
374 | 1200 | AC3EncodeContext *s = avctx->priv_data; | |
375 | int ret; | ||
376 | |||
377 |
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1200 | if (s->options.allow_per_frame_metadata) { |
378 | ✗ | ret = ff_ac3_validate_metadata(s); | |
379 | ✗ | if (ret) | |
380 | ✗ | return ret; | |
381 | } | ||
382 | |||
383 |
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1200 | if (s->bit_alloc.sr_code == 1 || (AC3ENC_FLOAT && s->eac3)) |
384 | 1200 | ff_ac3_adjust_frame_size(s); | |
385 | |||
386 | 1200 | copy_input_samples(s, (SampleType **)frame->extended_data); | |
387 | |||
388 | 1200 | apply_mdct(s); | |
389 | |||
390 | 1200 | s->cpl_on = s->cpl_enabled; | |
391 | 1200 | ff_ac3_compute_coupling_strategy(s); | |
392 | |||
393 |
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1200 | if (s->cpl_on) |
394 | 719 | apply_channel_coupling(s); | |
395 | |||
396 | 1200 | compute_rematrixing_strategy(s); | |
397 | |||
398 | #if AC3ENC_FLOAT | ||
399 | 546 | scale_coefficients(s); | |
400 | #endif | ||
401 | |||
402 | 1200 | return ff_ac3_encode_frame_common_end(avctx, avpkt, frame, got_packet_ptr); | |
403 | } | ||
404 |