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/* |
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* AC-3 encoder float/fixed template |
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* Copyright (c) 2000 Fabrice Bellard |
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* Copyright (c) 2006-2011 Justin Ruggles <justin.ruggles@gmail.com> |
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* Copyright (c) 2006-2010 Prakash Punnoor <prakash@punnoor.de> |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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/** |
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* @file |
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* AC-3 encoder float/fixed template |
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*/ |
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#include <stdint.h> |
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#include "libavutil/attributes.h" |
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#include "libavutil/internal.h" |
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#include "audiodsp.h" |
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#include "internal.h" |
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#include "ac3enc.h" |
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#include "eac3enc.h" |
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int AC3_NAME(allocate_sample_buffers)(AC3EncodeContext *s) |
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{ |
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int ch; |
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✓✗ |
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if (!FF_ALLOC_TYPED_ARRAY(s->windowed_samples, AC3_WINDOW_SIZE) || |
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✗✓ |
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!FF_ALLOCZ_TYPED_ARRAY(s->planar_samples, s->channels)) |
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return AVERROR(ENOMEM); |
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|
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✓✓ |
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for (ch = 0; ch < s->channels; ch++) { |
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✗✓ |
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if (!(s->planar_samples[ch] = av_mallocz((AC3_FRAME_SIZE + AC3_BLOCK_SIZE) * |
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sizeof(**s->planar_samples)))) |
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return AVERROR(ENOMEM); |
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} |
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return 0; |
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} |
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/* |
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* Copy input samples. |
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* Channels are reordered from FFmpeg's default order to AC-3 order. |
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*/ |
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static void copy_input_samples(AC3EncodeContext *s, SampleType **samples) |
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{ |
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int ch; |
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/* copy and remap input samples */ |
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✓✓ |
2913 |
for (ch = 0; ch < s->channels; ch++) { |
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/* copy last 256 samples of previous frame to the start of the current frame */ |
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memcpy(&s->planar_samples[ch][0], &s->planar_samples[ch][AC3_BLOCK_SIZE * s->num_blocks], |
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AC3_BLOCK_SIZE * sizeof(s->planar_samples[0][0])); |
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/* copy new samples for current frame */ |
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1816 |
memcpy(&s->planar_samples[ch][AC3_BLOCK_SIZE], |
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1816 |
samples[s->channel_map[ch]], |
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1816 |
AC3_BLOCK_SIZE * s->num_blocks * sizeof(s->planar_samples[0][0])); |
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} |
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1097 |
} |
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/* |
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* Apply the MDCT to input samples to generate frequency coefficients. |
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* This applies the KBD window and normalizes the input to reduce precision |
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* loss due to fixed-point calculations. |
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*/ |
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static void apply_mdct(AC3EncodeContext *s) |
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{ |
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int blk, ch; |
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|
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✓✓ |
2913 |
for (ch = 0; ch < s->channels; ch++) { |
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✓✓ |
12712 |
for (blk = 0; blk < s->num_blocks; blk++) { |
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10896 |
AC3Block *block = &s->blocks[blk]; |
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10896 |
const SampleType *input_samples = &s->planar_samples[ch][blk * AC3_BLOCK_SIZE]; |
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#if CONFIG_AC3ENC_FLOAT |
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s->fdsp->vector_fmul(s->windowed_samples, input_samples, |
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6552 |
s->mdct_window, AC3_WINDOW_SIZE); |
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#else |
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4344 |
s->ac3dsp.apply_window_int16(s->windowed_samples, input_samples, |
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4344 |
s->mdct_window, AC3_WINDOW_SIZE); |
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|
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✓✗ |
4344 |
if (s->fixed_point) |
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4344 |
block->coeff_shift[ch+1] = normalize_samples(s); |
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#endif |
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10896 |
s->mdct.mdct_calcw(&s->mdct, block->mdct_coef[ch+1], |
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10896 |
s->windowed_samples); |
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} |
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} |
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1097 |
} |
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/* |
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* Calculate coupling channel and coupling coordinates. |
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*/ |
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static void apply_channel_coupling(AC3EncodeContext *s) |
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{ |
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LOCAL_ALIGNED_16(CoefType, cpl_coords, [AC3_MAX_BLOCKS], [AC3_MAX_CHANNELS][16]); |
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#if CONFIG_AC3ENC_FLOAT |
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LOCAL_ALIGNED_16(int32_t, fixed_cpl_coords, [AC3_MAX_BLOCKS], [AC3_MAX_CHANNELS][16]); |
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#else |
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int32_t (*fixed_cpl_coords)[AC3_MAX_CHANNELS][16] = cpl_coords; |
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#endif |
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int av_uninit(blk), ch, bnd, i, j; |
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CoefSumType energy[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS][16] = {{{0}}}; |
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int cpl_start, num_cpl_coefs; |
125 |
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719 |
memset(cpl_coords, 0, AC3_MAX_BLOCKS * sizeof(*cpl_coords)); |
127 |
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#if CONFIG_AC3ENC_FLOAT |
128 |
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memset(fixed_cpl_coords, 0, AC3_MAX_BLOCKS * sizeof(*cpl_coords)); |
129 |
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#endif |
130 |
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/* align start to 16-byte boundary. align length to multiple of 32. |
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note: coupling start bin % 4 will always be 1 */ |
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719 |
cpl_start = s->start_freq[CPL_CH] - 1; |
134 |
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num_cpl_coefs = FFALIGN(s->num_cpl_subbands * 12 + 1, 32); |
135 |
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cpl_start = FFMIN(256, cpl_start + num_cpl_coefs) - num_cpl_coefs; |
136 |
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137 |
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/* calculate coupling channel from fbw channels */ |
138 |
✓✓ |
5033 |
for (blk = 0; blk < s->num_blocks; blk++) { |
139 |
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4314 |
AC3Block *block = &s->blocks[blk]; |
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4314 |
CoefType *cpl_coef = &block->mdct_coef[CPL_CH][cpl_start]; |
141 |
✗✓ |
4314 |
if (!block->cpl_in_use) |
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continue; |
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4314 |
memset(cpl_coef, 0, num_cpl_coefs * sizeof(*cpl_coef)); |
144 |
✓✓ |
12942 |
for (ch = 1; ch <= s->fbw_channels; ch++) { |
145 |
|
8628 |
CoefType *ch_coef = &block->mdct_coef[ch][cpl_start]; |
146 |
✗✓ |
8628 |
if (!block->channel_in_cpl[ch]) |
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continue; |
148 |
✓✓ |
560820 |
for (i = 0; i < num_cpl_coefs; i++) |
149 |
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552192 |
cpl_coef[i] += ch_coef[i]; |
150 |
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} |
151 |
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152 |
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/* coefficients must be clipped in order to be encoded */ |
153 |
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4314 |
clip_coefficients(&s->adsp, cpl_coef, num_cpl_coefs); |
154 |
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} |
155 |
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156 |
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/* calculate energy in each band in coupling channel and each fbw channel */ |
157 |
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/* TODO: possibly use SIMD to speed up energy calculation */ |
158 |
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719 |
bnd = 0; |
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719 |
i = s->start_freq[CPL_CH]; |
160 |
✓✓ |
3595 |
while (i < s->cpl_end_freq) { |
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2876 |
int band_size = s->cpl_band_sizes[bnd]; |
162 |
✓✓ |
11504 |
for (ch = CPL_CH; ch <= s->fbw_channels; ch++) { |
163 |
✓✓ |
60396 |
for (blk = 0; blk < s->num_blocks; blk++) { |
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51768 |
AC3Block *block = &s->blocks[blk]; |
165 |
✓✗✓✓
✗✓ |
51768 |
if (!block->cpl_in_use || (ch > CPL_CH && !block->channel_in_cpl[ch])) |
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continue; |
167 |
✓✓ |
828288 |
for (j = 0; j < band_size; j++) { |
168 |
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776520 |
CoefType v = block->mdct_coef[ch][i+j]; |
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776520 |
MAC_COEF(energy[blk][ch][bnd], v, v); |
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} |
171 |
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} |
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} |
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2876 |
i += band_size; |
174 |
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2876 |
bnd++; |
175 |
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} |
176 |
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177 |
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/* calculate coupling coordinates for all blocks for all channels */ |
178 |
✓✓ |
5033 |
for (blk = 0; blk < s->num_blocks; blk++) { |
179 |
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4314 |
AC3Block *block = &s->blocks[blk]; |
180 |
✗✓ |
4314 |
if (!block->cpl_in_use) |
181 |
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continue; |
182 |
✓✓ |
12942 |
for (ch = 1; ch <= s->fbw_channels; ch++) { |
183 |
✗✓ |
8628 |
if (!block->channel_in_cpl[ch]) |
184 |
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continue; |
185 |
✓✓ |
43140 |
for (bnd = 0; bnd < s->num_cpl_bands; bnd++) { |
186 |
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34512 |
cpl_coords[blk][ch][bnd] = calc_cpl_coord(energy[blk][ch][bnd], |
187 |
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energy[blk][CPL_CH][bnd]); |
188 |
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} |
189 |
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} |
190 |
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} |
191 |
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|
192 |
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/* determine which blocks to send new coupling coordinates for */ |
193 |
✓✓ |
5033 |
for (blk = 0; blk < s->num_blocks; blk++) { |
194 |
|
4314 |
AC3Block *block = &s->blocks[blk]; |
195 |
✓✓ |
4314 |
AC3Block *block0 = blk ? &s->blocks[blk-1] : NULL; |
196 |
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|
197 |
|
4314 |
memset(block->new_cpl_coords, 0, sizeof(block->new_cpl_coords)); |
198 |
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|
199 |
✓✗ |
4314 |
if (block->cpl_in_use) { |
200 |
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/* send new coordinates if this is the first block, if previous |
201 |
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* block did not use coupling but this block does, the channels |
202 |
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* using coupling has changed from the previous block, or the |
203 |
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* coordinate difference from the last block for any channel is |
204 |
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* greater than a threshold value. */ |
205 |
✓✓✗✓
|
4314 |
if (blk == 0 || !block0->cpl_in_use) { |
206 |
✓✓ |
2157 |
for (ch = 1; ch <= s->fbw_channels; ch++) |
207 |
|
1438 |
block->new_cpl_coords[ch] = 1; |
208 |
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} else { |
209 |
✓✓ |
10785 |
for (ch = 1; ch <= s->fbw_channels; ch++) { |
210 |
✗✓ |
7190 |
if (!block->channel_in_cpl[ch]) |
211 |
|
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continue; |
212 |
✗✓ |
7190 |
if (!block0->channel_in_cpl[ch]) { |
213 |
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block->new_cpl_coords[ch] = 1; |
214 |
|
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} else { |
215 |
|
7190 |
CoefSumType coord_diff = 0; |
216 |
✓✓ |
35950 |
for (bnd = 0; bnd < s->num_cpl_bands; bnd++) { |
217 |
✓✓ |
28760 |
coord_diff += FFABS(cpl_coords[blk-1][ch][bnd] - |
218 |
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cpl_coords[blk ][ch][bnd]); |
219 |
|
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} |
220 |
|
7190 |
coord_diff /= s->num_cpl_bands; |
221 |
✓✓ |
7190 |
if (coord_diff > NEW_CPL_COORD_THRESHOLD) |
222 |
|
32 |
block->new_cpl_coords[ch] = 1; |
223 |
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} |
224 |
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} |
225 |
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} |
226 |
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} |
227 |
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} |
228 |
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|
229 |
|
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/* calculate final coupling coordinates, taking into account reusing of |
230 |
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coordinates in successive blocks */ |
231 |
✓✓ |
3595 |
for (bnd = 0; bnd < s->num_cpl_bands; bnd++) { |
232 |
|
2876 |
blk = 0; |
233 |
✓✓ |
5840 |
while (blk < s->num_blocks) { |
234 |
|
2964 |
int av_uninit(blk1); |
235 |
|
2964 |
AC3Block *block = &s->blocks[blk]; |
236 |
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|
237 |
✗✓ |
2964 |
if (!block->cpl_in_use) { |
238 |
|
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blk++; |
239 |
|
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continue; |
240 |
|
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} |
241 |
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|
242 |
✓✓ |
8892 |
for (ch = 1; ch <= s->fbw_channels; ch++) { |
243 |
|
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CoefSumType energy_ch, energy_cpl; |
244 |
✗✓ |
5928 |
if (!block->channel_in_cpl[ch]) |
245 |
|
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continue; |
246 |
|
5928 |
energy_cpl = energy[blk][CPL_CH][bnd]; |
247 |
|
5928 |
energy_ch = energy[blk][ch][bnd]; |
248 |
|
5928 |
blk1 = blk+1; |
249 |
✓✓✓✓
|
34696 |
while (blk1 < s->num_blocks && !s->blocks[blk1].new_cpl_coords[ch]) { |
250 |
✓✗ |
28768 |
if (s->blocks[blk1].cpl_in_use) { |
251 |
|
28768 |
energy_cpl += energy[blk1][CPL_CH][bnd]; |
252 |
|
28768 |
energy_ch += energy[blk1][ch][bnd]; |
253 |
|
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} |
254 |
|
28768 |
blk1++; |
255 |
|
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} |
256 |
|
5928 |
cpl_coords[blk][ch][bnd] = calc_cpl_coord(energy_ch, energy_cpl); |
257 |
|
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} |
258 |
|
2964 |
blk = blk1; |
259 |
|
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} |
260 |
|
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} |
261 |
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|
262 |
|
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/* calculate exponents/mantissas for coupling coordinates */ |
263 |
✓✓ |
5033 |
for (blk = 0; blk < s->num_blocks; blk++) { |
264 |
|
4314 |
AC3Block *block = &s->blocks[blk]; |
265 |
✗✓ |
4314 |
if (!block->cpl_in_use) |
266 |
|
|
continue; |
267 |
|
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|
268 |
|
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#if CONFIG_AC3ENC_FLOAT |
269 |
|
3276 |
s->ac3dsp.float_to_fixed24(fixed_cpl_coords[blk][1], |
270 |
|
3276 |
cpl_coords[blk][1], |
271 |
|
3276 |
s->fbw_channels * 16); |
272 |
|
|
#endif |
273 |
|
4314 |
s->ac3dsp.extract_exponents(block->cpl_coord_exp[1], |
274 |
|
4314 |
fixed_cpl_coords[blk][1], |
275 |
|
4314 |
s->fbw_channels * 16); |
276 |
|
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|
277 |
✓✓ |
12942 |
for (ch = 1; ch <= s->fbw_channels; ch++) { |
278 |
|
|
int bnd, min_exp, max_exp, master_exp; |
279 |
|
|
|
280 |
✓✓ |
8628 |
if (!block->new_cpl_coords[ch]) |
281 |
|
7158 |
continue; |
282 |
|
|
|
283 |
|
|
/* determine master exponent */ |
284 |
|
1470 |
min_exp = max_exp = block->cpl_coord_exp[ch][0]; |
285 |
✓✓ |
5880 |
for (bnd = 1; bnd < s->num_cpl_bands; bnd++) { |
286 |
|
4410 |
int exp = block->cpl_coord_exp[ch][bnd]; |
287 |
|
4410 |
min_exp = FFMIN(exp, min_exp); |
288 |
|
4410 |
max_exp = FFMAX(exp, max_exp); |
289 |
|
|
} |
290 |
|
1470 |
master_exp = ((max_exp - 15) + 2) / 3; |
291 |
|
1470 |
master_exp = FFMAX(master_exp, 0); |
292 |
✗✓ |
1470 |
while (min_exp < master_exp * 3) |
293 |
|
|
master_exp--; |
294 |
✓✓ |
7350 |
for (bnd = 0; bnd < s->num_cpl_bands; bnd++) { |
295 |
|
5880 |
block->cpl_coord_exp[ch][bnd] = av_clip(block->cpl_coord_exp[ch][bnd] - |
296 |
|
5880 |
master_exp * 3, 0, 15); |
297 |
|
|
} |
298 |
|
1470 |
block->cpl_master_exp[ch] = master_exp; |
299 |
|
|
|
300 |
|
|
/* quantize mantissas */ |
301 |
✓✓ |
7350 |
for (bnd = 0; bnd < s->num_cpl_bands; bnd++) { |
302 |
|
5880 |
int cpl_exp = block->cpl_coord_exp[ch][bnd]; |
303 |
|
5880 |
int cpl_mant = (fixed_cpl_coords[blk][ch][bnd] << (5 + cpl_exp + master_exp * 3)) >> 24; |
304 |
✗✓ |
5880 |
if (cpl_exp == 15) |
305 |
|
|
cpl_mant >>= 1; |
306 |
|
|
else |
307 |
|
5880 |
cpl_mant -= 16; |
308 |
|
|
|
309 |
|
5880 |
block->cpl_coord_mant[ch][bnd] = cpl_mant; |
310 |
|
|
} |
311 |
|
|
} |
312 |
|
|
} |
313 |
|
|
|
314 |
✓✓ |
719 |
if (CONFIG_EAC3_ENCODER && s->eac3) |
315 |
|
273 |
ff_eac3_set_cpl_states(s); |
316 |
|
719 |
} |
317 |
|
|
|
318 |
|
|
|
319 |
|
|
/* |
320 |
|
|
* Determine rematrixing flags for each block and band. |
321 |
|
|
*/ |
322 |
|
1097 |
static void compute_rematrixing_strategy(AC3EncodeContext *s) |
323 |
|
|
{ |
324 |
|
|
int nb_coefs; |
325 |
|
|
int blk, bnd; |
326 |
|
1097 |
AC3Block *block, *block0 = NULL; |
327 |
|
|
|
328 |
✓✓ |
1097 |
if (s->channel_mode != AC3_CHMODE_STEREO) |
329 |
|
378 |
return; |
330 |
|
|
|
331 |
✓✓ |
5033 |
for (blk = 0; blk < s->num_blocks; blk++) { |
332 |
|
4314 |
block = &s->blocks[blk]; |
333 |
|
4314 |
block->new_rematrixing_strategy = !blk; |
334 |
|
|
|
335 |
|
4314 |
block->num_rematrixing_bands = 4; |
336 |
✓✗ |
4314 |
if (block->cpl_in_use) { |
337 |
|
4314 |
block->num_rematrixing_bands -= (s->start_freq[CPL_CH] <= 61); |
338 |
|
4314 |
block->num_rematrixing_bands -= (s->start_freq[CPL_CH] == 37); |
339 |
✓✓✗✓
|
4314 |
if (blk && block->num_rematrixing_bands != block0->num_rematrixing_bands) |
340 |
|
|
block->new_rematrixing_strategy = 1; |
341 |
|
|
} |
342 |
|
4314 |
nb_coefs = FFMIN(block->end_freq[1], block->end_freq[2]); |
343 |
|
|
|
344 |
✗✓ |
4314 |
if (!s->rematrixing_enabled) { |
345 |
|
|
block0 = block; |
346 |
|
|
continue; |
347 |
|
|
} |
348 |
|
|
|
349 |
✓✓ |
21570 |
for (bnd = 0; bnd < block->num_rematrixing_bands; bnd++) { |
350 |
|
|
/* calculate sum of squared coeffs for one band in one block */ |
351 |
|
17256 |
int start = ff_ac3_rematrix_band_tab[bnd]; |
352 |
|
17256 |
int end = FFMIN(nb_coefs, ff_ac3_rematrix_band_tab[bnd+1]); |
353 |
|
|
CoefSumType sum[4]; |
354 |
|
17256 |
sum_square_butterfly(s, sum, block->mdct_coef[1] + start, |
355 |
|
17256 |
block->mdct_coef[2] + start, end - start); |
356 |
|
|
|
357 |
|
|
/* compare sums to determine if rematrixing will be used for this band */ |
358 |
✓✓✓✓
✓✓ |
17256 |
if (FFMIN(sum[2], sum[3]) < FFMIN(sum[0], sum[1])) |
359 |
|
9589 |
block->rematrixing_flags[bnd] = 1; |
360 |
|
|
else |
361 |
|
7667 |
block->rematrixing_flags[bnd] = 0; |
362 |
|
|
|
363 |
|
|
/* determine if new rematrixing flags will be sent */ |
364 |
✓✓ |
17256 |
if (blk && |
365 |
✓✓ |
14380 |
block->rematrixing_flags[bnd] != block0->rematrixing_flags[bnd]) { |
366 |
|
1932 |
block->new_rematrixing_strategy = 1; |
367 |
|
|
} |
368 |
|
|
} |
369 |
|
4314 |
block0 = block; |
370 |
|
|
} |
371 |
|
|
} |
372 |
|
|
|
373 |
|
|
|
374 |
|
1097 |
int AC3_NAME(encode_frame)(AVCodecContext *avctx, AVPacket *avpkt, |
375 |
|
|
const AVFrame *frame, int *got_packet_ptr) |
376 |
|
|
{ |
377 |
|
1097 |
AC3EncodeContext *s = avctx->priv_data; |
378 |
|
|
int ret; |
379 |
|
|
|
380 |
✗✓ |
1097 |
if (s->options.allow_per_frame_metadata) { |
381 |
|
|
ret = ff_ac3_validate_metadata(s); |
382 |
|
|
if (ret) |
383 |
|
|
return ret; |
384 |
|
|
} |
385 |
|
|
|
386 |
✗✓✗✗
|
1097 |
if (s->bit_alloc.sr_code == 1 || s->eac3) |
387 |
|
1097 |
ff_ac3_adjust_frame_size(s); |
388 |
|
|
|
389 |
|
1097 |
copy_input_samples(s, (SampleType **)frame->extended_data); |
390 |
|
|
|
391 |
|
1097 |
apply_mdct(s); |
392 |
|
|
|
393 |
✓✓ |
1097 |
if (s->fixed_point) |
394 |
|
551 |
scale_coefficients(s); |
395 |
|
|
|
396 |
|
1097 |
clip_coefficients(&s->adsp, s->blocks[0].mdct_coef[1], |
397 |
|
1097 |
AC3_MAX_COEFS * s->num_blocks * s->channels); |
398 |
|
|
|
399 |
|
1097 |
s->cpl_on = s->cpl_enabled; |
400 |
|
1097 |
ff_ac3_compute_coupling_strategy(s); |
401 |
|
|
|
402 |
✓✓ |
1097 |
if (s->cpl_on) |
403 |
|
719 |
apply_channel_coupling(s); |
404 |
|
|
|
405 |
|
1097 |
compute_rematrixing_strategy(s); |
406 |
|
|
|
407 |
✓✓ |
1097 |
if (!s->fixed_point) |
408 |
|
546 |
scale_coefficients(s); |
409 |
|
|
|
410 |
|
1097 |
ff_ac3_apply_rematrixing(s); |
411 |
|
|
|
412 |
|
1097 |
ff_ac3_process_exponents(s); |
413 |
|
|
|
414 |
|
1097 |
ret = ff_ac3_compute_bit_allocation(s); |
415 |
✗✓ |
1097 |
if (ret) { |
416 |
|
|
av_log(avctx, AV_LOG_ERROR, "Bit allocation failed. Try increasing the bitrate.\n"); |
417 |
|
|
return ret; |
418 |
|
|
} |
419 |
|
|
|
420 |
|
1097 |
ff_ac3_group_exponents(s); |
421 |
|
|
|
422 |
|
1097 |
ff_ac3_quantize_mantissas(s); |
423 |
|
|
|
424 |
✗✓ |
1097 |
if ((ret = ff_alloc_packet2(avctx, avpkt, s->frame_size, 0)) < 0) |
425 |
|
|
return ret; |
426 |
|
1097 |
ff_ac3_output_frame(s, avpkt->data); |
427 |
|
|
|
428 |
✓✗ |
1097 |
if (frame->pts != AV_NOPTS_VALUE) |
429 |
|
1097 |
avpkt->pts = frame->pts - ff_samples_to_time_base(avctx, avctx->initial_padding); |
430 |
|
|
|
431 |
|
1097 |
*got_packet_ptr = 1; |
432 |
|
1097 |
return 0; |
433 |
|
|
} |