diff options
| author | Tim Redfern <tim@eclectronics.org> | 2013-09-05 17:55:35 +0100 |
|---|---|---|
| committer | Tim Redfern <tim@eclectronics.org> | 2013-09-05 17:55:35 +0100 |
| commit | 741fb4b9e135cfb161a749db88713229038577bb (patch) | |
| tree | 08bc9925659cbcac45162bacf31dc6336d4f60b4 /ffmpeg1/libavcodec/ac3enc.c | |
| parent | a2e1bf3495b7bfefdaedb8fc737e969ab06df079 (diff) | |
making act segmenter
Diffstat (limited to 'ffmpeg1/libavcodec/ac3enc.c')
| -rw-r--r-- | ffmpeg1/libavcodec/ac3enc.c | 2491 |
1 files changed, 0 insertions, 2491 deletions
diff --git a/ffmpeg1/libavcodec/ac3enc.c b/ffmpeg1/libavcodec/ac3enc.c deleted file mode 100644 index 15ff343..0000000 --- a/ffmpeg1/libavcodec/ac3enc.c +++ /dev/null @@ -1,2491 +0,0 @@ -/* - * The simplest AC-3 encoder - * Copyright (c) 2000 Fabrice Bellard - * Copyright (c) 2006-2010 Justin Ruggles <justin.ruggles@gmail.com> - * Copyright (c) 2006-2010 Prakash Punnoor <prakash@punnoor.de> - * - * This file is part of FFmpeg. - * - * FFmpeg is free software; you can redistribute it and/or - * modify it under the terms of the GNU Lesser General Public - * License as published by the Free Software Foundation; either - * version 2.1 of the License, or (at your option) any later version. - * - * FFmpeg is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * Lesser General Public License for more details. - * - * You should have received a copy of the GNU Lesser General Public - * License along with FFmpeg; if not, write to the Free Software - * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA - */ - -/** - * @file - * The simplest AC-3 encoder. - */ - -//#define ASSERT_LEVEL 2 - -#include <stdint.h> - -#include "libavutil/avassert.h" -#include "libavutil/avstring.h" -#include "libavutil/channel_layout.h" -#include "libavutil/crc.h" -#include "libavutil/internal.h" -#include "libavutil/opt.h" -#include "avcodec.h" -#include "put_bits.h" -#include "ac3dsp.h" -#include "ac3.h" -#include "fft.h" -#include "ac3enc.h" -#include "eac3enc.h" - -typedef struct AC3Mant { - int16_t *qmant1_ptr, *qmant2_ptr, *qmant4_ptr; ///< mantissa pointers for bap=1,2,4 - int mant1_cnt, mant2_cnt, mant4_cnt; ///< mantissa counts for bap=1,2,4 -} AC3Mant; - -#define CMIXLEV_NUM_OPTIONS 3 -static const float cmixlev_options[CMIXLEV_NUM_OPTIONS] = { - LEVEL_MINUS_3DB, LEVEL_MINUS_4POINT5DB, LEVEL_MINUS_6DB -}; - -#define SURMIXLEV_NUM_OPTIONS 3 -static const float surmixlev_options[SURMIXLEV_NUM_OPTIONS] = { - LEVEL_MINUS_3DB, LEVEL_MINUS_6DB, LEVEL_ZERO -}; - -#define EXTMIXLEV_NUM_OPTIONS 8 -static const float extmixlev_options[EXTMIXLEV_NUM_OPTIONS] = { - LEVEL_PLUS_3DB, LEVEL_PLUS_1POINT5DB, LEVEL_ONE, LEVEL_MINUS_4POINT5DB, - LEVEL_MINUS_3DB, LEVEL_MINUS_4POINT5DB, LEVEL_MINUS_6DB, LEVEL_ZERO -}; - - -/** - * LUT for number of exponent groups. - * exponent_group_tab[coupling][exponent strategy-1][number of coefficients] - */ -static uint8_t exponent_group_tab[2][3][256]; - - -/** - * List of supported channel layouts. - */ -const uint64_t ff_ac3_channel_layouts[19] = { - AV_CH_LAYOUT_MONO, - AV_CH_LAYOUT_STEREO, - AV_CH_LAYOUT_2_1, - AV_CH_LAYOUT_SURROUND, - AV_CH_LAYOUT_2_2, - AV_CH_LAYOUT_QUAD, - AV_CH_LAYOUT_4POINT0, - AV_CH_LAYOUT_5POINT0, - AV_CH_LAYOUT_5POINT0_BACK, - (AV_CH_LAYOUT_MONO | AV_CH_LOW_FREQUENCY), - (AV_CH_LAYOUT_STEREO | AV_CH_LOW_FREQUENCY), - (AV_CH_LAYOUT_2_1 | AV_CH_LOW_FREQUENCY), - (AV_CH_LAYOUT_SURROUND | AV_CH_LOW_FREQUENCY), - (AV_CH_LAYOUT_2_2 | AV_CH_LOW_FREQUENCY), - (AV_CH_LAYOUT_QUAD | AV_CH_LOW_FREQUENCY), - (AV_CH_LAYOUT_4POINT0 | AV_CH_LOW_FREQUENCY), - AV_CH_LAYOUT_5POINT1, - AV_CH_LAYOUT_5POINT1_BACK, - 0 -}; - - -/** - * LUT to select the bandwidth code based on the bit rate, sample rate, and - * number of full-bandwidth channels. - * bandwidth_tab[fbw_channels-1][sample rate code][bit rate code] - */ -static const uint8_t ac3_bandwidth_tab[5][3][19] = { -// 32 40 48 56 64 80 96 112 128 160 192 224 256 320 384 448 512 576 640 - - { { 0, 0, 0, 12, 16, 32, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48 }, - { 0, 0, 0, 16, 20, 36, 56, 56, 56, 56, 56, 56, 56, 56, 56, 56, 56, 56, 56 }, - { 0, 0, 0, 32, 40, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60 } }, - - { { 0, 0, 0, 0, 0, 0, 0, 20, 24, 32, 48, 48, 48, 48, 48, 48, 48, 48, 48 }, - { 0, 0, 0, 0, 0, 0, 4, 24, 28, 36, 56, 56, 56, 56, 56, 56, 56, 56, 56 }, - { 0, 0, 0, 0, 0, 0, 20, 44, 52, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60 } }, - - { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 16, 24, 32, 40, 48, 48, 48, 48, 48, 48 }, - { 0, 0, 0, 0, 0, 0, 0, 0, 4, 20, 28, 36, 44, 56, 56, 56, 56, 56, 56 }, - { 0, 0, 0, 0, 0, 0, 0, 0, 20, 40, 48, 60, 60, 60, 60, 60, 60, 60, 60 } }, - - { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 12, 24, 32, 48, 48, 48, 48, 48, 48 }, - { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 16, 28, 36, 56, 56, 56, 56, 56, 56 }, - { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 32, 48, 60, 60, 60, 60, 60, 60, 60 } }, - - { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 8, 20, 32, 40, 48, 48, 48, 48 }, - { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 12, 24, 36, 44, 56, 56, 56, 56 }, - { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 28, 44, 60, 60, 60, 60, 60, 60 } } -}; - - -/** - * LUT to select the coupling start band based on the bit rate, sample rate, and - * number of full-bandwidth channels. -1 = coupling off - * ac3_coupling_start_tab[channel_mode-2][sample rate code][bit rate code] - * - * TODO: more testing for optimal parameters. - * multi-channel tests at 44.1kHz and 32kHz. - */ -static const int8_t ac3_coupling_start_tab[6][3][19] = { -// 32 40 48 56 64 80 96 112 128 160 192 224 256 320 384 448 512 576 640 - - // 2/0 - { { 0, 0, 0, 0, 0, 0, 0, 1, 1, 7, 8, 11, 12, -1, -1, -1, -1, -1, -1 }, - { 0, 0, 0, 0, 0, 0, 1, 3, 5, 7, 10, 12, 13, -1, -1, -1, -1, -1, -1 }, - { 0, 0, 0, 0, 1, 2, 2, 9, 13, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1 } }, - - // 3/0 - { { 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 6, 9, 11, 12, 13, -1, -1, -1, -1 }, - { 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 6, 9, 11, 12, 13, -1, -1, -1, -1 }, - { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 } }, - - // 2/1 - untested - { { 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 6, 9, 11, 12, 13, -1, -1, -1, -1 }, - { 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 6, 9, 11, 12, 13, -1, -1, -1, -1 }, - { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 } }, - - // 3/1 - { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 2, 10, 11, 11, 12, 12, 14, -1 }, - { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 2, 10, 11, 11, 12, 12, 14, -1 }, - { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 } }, - - // 2/2 - untested - { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 2, 10, 11, 11, 12, 12, 14, -1 }, - { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 2, 10, 11, 11, 12, 12, 14, -1 }, - { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 } }, - - // 3/2 - { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 6, 8, 11, 12, 12, -1, -1 }, - { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 6, 8, 11, 12, 12, -1, -1 }, - { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 } }, -}; - - -/** - * Adjust the frame size to make the average bit rate match the target bit rate. - * This is only needed for 11025, 22050, and 44100 sample rates or any E-AC-3. - * - * @param s AC-3 encoder private context - */ -void ff_ac3_adjust_frame_size(AC3EncodeContext *s) -{ - while (s->bits_written >= s->bit_rate && s->samples_written >= s->sample_rate) { - s->bits_written -= s->bit_rate; - s->samples_written -= s->sample_rate; - } - s->frame_size = s->frame_size_min + - 2 * (s->bits_written * s->sample_rate < s->samples_written * s->bit_rate); - s->bits_written += s->frame_size * 8; - s->samples_written += AC3_BLOCK_SIZE * s->num_blocks; -} - - -/** - * Set the initial coupling strategy parameters prior to coupling analysis. - * - * @param s AC-3 encoder private context - */ -void ff_ac3_compute_coupling_strategy(AC3EncodeContext *s) -{ - int blk, ch; - int got_cpl_snr; - int num_cpl_blocks; - - /* set coupling use flags for each block/channel */ - /* TODO: turn coupling on/off and adjust start band based on bit usage */ - for (blk = 0; blk < s->num_blocks; blk++) { - AC3Block *block = &s->blocks[blk]; - for (ch = 1; ch <= s->fbw_channels; ch++) - block->channel_in_cpl[ch] = s->cpl_on; - } - - /* enable coupling for each block if at least 2 channels have coupling - enabled for that block */ - got_cpl_snr = 0; - num_cpl_blocks = 0; - for (blk = 0; blk < s->num_blocks; blk++) { - AC3Block *block = &s->blocks[blk]; - block->num_cpl_channels = 0; - for (ch = 1; ch <= s->fbw_channels; ch++) - block->num_cpl_channels += block->channel_in_cpl[ch]; - block->cpl_in_use = block->num_cpl_channels > 1; - num_cpl_blocks += block->cpl_in_use; - if (!block->cpl_in_use) { - block->num_cpl_channels = 0; - for (ch = 1; ch <= s->fbw_channels; ch++) - block->channel_in_cpl[ch] = 0; - } - - block->new_cpl_strategy = !blk; - if (blk) { - for (ch = 1; ch <= s->fbw_channels; ch++) { - if (block->channel_in_cpl[ch] != s->blocks[blk-1].channel_in_cpl[ch]) { - block->new_cpl_strategy = 1; - break; - } - } - } - block->new_cpl_leak = block->new_cpl_strategy; - - if (!blk || (block->cpl_in_use && !got_cpl_snr)) { - block->new_snr_offsets = 1; - if (block->cpl_in_use) - got_cpl_snr = 1; - } else { - block->new_snr_offsets = 0; - } - } - if (!num_cpl_blocks) - s->cpl_on = 0; - - /* set bandwidth for each channel */ - for (blk = 0; blk < s->num_blocks; blk++) { - AC3Block *block = &s->blocks[blk]; - for (ch = 1; ch <= s->fbw_channels; ch++) { - if (block->channel_in_cpl[ch]) - block->end_freq[ch] = s->start_freq[CPL_CH]; - else - block->end_freq[ch] = s->bandwidth_code * 3 + 73; - } - } -} - - -/** - * Apply stereo rematrixing to coefficients based on rematrixing flags. - * - * @param s AC-3 encoder private context - */ -void ff_ac3_apply_rematrixing(AC3EncodeContext *s) -{ - int nb_coefs; - int blk, bnd, i; - int start, end; - uint8_t *flags = NULL; - - if (!s->rematrixing_enabled) - return; - - for (blk = 0; blk < s->num_blocks; blk++) { - AC3Block *block = &s->blocks[blk]; - if (block->new_rematrixing_strategy) - flags = block->rematrixing_flags; - nb_coefs = FFMIN(block->end_freq[1], block->end_freq[2]); - for (bnd = 0; bnd < block->num_rematrixing_bands; bnd++) { - if (flags[bnd]) { - start = ff_ac3_rematrix_band_tab[bnd]; - end = FFMIN(nb_coefs, ff_ac3_rematrix_band_tab[bnd+1]); - for (i = start; i < end; i++) { - int32_t lt = block->fixed_coef[1][i]; - int32_t rt = block->fixed_coef[2][i]; - block->fixed_coef[1][i] = (lt + rt) >> 1; - block->fixed_coef[2][i] = (lt - rt) >> 1; - } - } - } - } -} - - -/* - * Initialize exponent tables. - */ -static av_cold void exponent_init(AC3EncodeContext *s) -{ - int expstr, i, grpsize; - - for (expstr = EXP_D15-1; expstr <= EXP_D45-1; expstr++) { - grpsize = 3 << expstr; - for (i = 12; i < 256; i++) { - exponent_group_tab[0][expstr][i] = (i + grpsize - 4) / grpsize; - exponent_group_tab[1][expstr][i] = (i ) / grpsize; - } - } - /* LFE */ - exponent_group_tab[0][0][7] = 2; - - if (CONFIG_EAC3_ENCODER && s->eac3) - ff_eac3_exponent_init(); -} - - -/* - * Extract exponents from the MDCT coefficients. - */ -static void extract_exponents(AC3EncodeContext *s) -{ - int ch = !s->cpl_on; - int chan_size = AC3_MAX_COEFS * s->num_blocks * (s->channels - ch + 1); - AC3Block *block = &s->blocks[0]; - - s->ac3dsp.extract_exponents(block->exp[ch], block->fixed_coef[ch], chan_size); -} - - -/** - * Exponent Difference Threshold. - * New exponents are sent if their SAD exceed this number. - */ -#define EXP_DIFF_THRESHOLD 500 - -/** - * Table used to select exponent strategy based on exponent reuse block interval. - */ -static const uint8_t exp_strategy_reuse_tab[4][6] = { - { EXP_D15, EXP_D15, EXP_D15, EXP_D15, EXP_D15, EXP_D15 }, - { EXP_D15, EXP_D15, EXP_D15, EXP_D15, EXP_D15, EXP_D15 }, - { EXP_D25, EXP_D25, EXP_D15, EXP_D15, EXP_D15, EXP_D15 }, - { EXP_D45, EXP_D25, EXP_D25, EXP_D15, EXP_D15, EXP_D15 } -}; - -/* - * Calculate exponent strategies for all channels. - * Array arrangement is reversed to simplify the per-channel calculation. - */ -static void compute_exp_strategy(AC3EncodeContext *s) -{ - int ch, blk, blk1; - - for (ch = !s->cpl_on; ch <= s->fbw_channels; ch++) { - uint8_t *exp_strategy = s->exp_strategy[ch]; - uint8_t *exp = s->blocks[0].exp[ch]; - int exp_diff; - - /* estimate if the exponent variation & decide if they should be - reused in the next frame */ - exp_strategy[0] = EXP_NEW; - exp += AC3_MAX_COEFS; - for (blk = 1; blk < s->num_blocks; blk++, exp += AC3_MAX_COEFS) { - if (ch == CPL_CH) { - if (!s->blocks[blk-1].cpl_in_use) { - exp_strategy[blk] = EXP_NEW; - continue; - } else if (!s->blocks[blk].cpl_in_use) { - exp_strategy[blk] = EXP_REUSE; - continue; - } - } else if (s->blocks[blk].channel_in_cpl[ch] != s->blocks[blk-1].channel_in_cpl[ch]) { - exp_strategy[blk] = EXP_NEW; - continue; - } - exp_diff = s->dsp.sad[0](NULL, exp, exp - AC3_MAX_COEFS, 16, 16); - exp_strategy[blk] = EXP_REUSE; - if (ch == CPL_CH && exp_diff > (EXP_DIFF_THRESHOLD * (s->blocks[blk].end_freq[ch] - s->start_freq[ch]) / AC3_MAX_COEFS)) - exp_strategy[blk] = EXP_NEW; - else if (ch > CPL_CH && exp_diff > EXP_DIFF_THRESHOLD) - exp_strategy[blk] = EXP_NEW; - } - - /* now select the encoding strategy type : if exponents are often - recoded, we use a coarse encoding */ - blk = 0; - while (blk < s->num_blocks) { - blk1 = blk + 1; - while (blk1 < s->num_blocks && exp_strategy[blk1] == EXP_REUSE) - blk1++; - exp_strategy[blk] = exp_strategy_reuse_tab[s->num_blks_code][blk1-blk-1]; - blk = blk1; - } - } - if (s->lfe_on) { - ch = s->lfe_channel; - s->exp_strategy[ch][0] = EXP_D15; - for (blk = 1; blk < s->num_blocks; blk++) - s->exp_strategy[ch][blk] = EXP_REUSE; - } - - /* for E-AC-3, determine frame exponent strategy */ - if (CONFIG_EAC3_ENCODER && s->eac3) - ff_eac3_get_frame_exp_strategy(s); -} - - -/** - * Update the exponents so that they are the ones the decoder will decode. - * - * @param[in,out] exp array of exponents for 1 block in 1 channel - * @param nb_exps number of exponents in active bandwidth - * @param exp_strategy exponent strategy for the block - * @param cpl indicates if the block is in the coupling channel - */ -static void encode_exponents_blk_ch(uint8_t *exp, int nb_exps, int exp_strategy, - int cpl) -{ - int nb_groups, i, k; - - nb_groups = exponent_group_tab[cpl][exp_strategy-1][nb_exps] * 3; - - /* for each group, compute the minimum exponent */ - switch(exp_strategy) { - case EXP_D25: - for (i = 1, k = 1-cpl; i <= nb_groups; i++) { - uint8_t exp_min = exp[k]; - if (exp[k+1] < exp_min) - exp_min = exp[k+1]; - exp[i-cpl] = exp_min; - k += 2; - } - break; - case EXP_D45: - for (i = 1, k = 1-cpl; i <= nb_groups; i++) { - uint8_t exp_min = exp[k]; - if (exp[k+1] < exp_min) - exp_min = exp[k+1]; - if (exp[k+2] < exp_min) - exp_min = exp[k+2]; - if (exp[k+3] < exp_min) - exp_min = exp[k+3]; - exp[i-cpl] = exp_min; - k += 4; - } - break; - } - - /* constraint for DC exponent */ - if (!cpl && exp[0] > 15) - exp[0] = 15; - - /* decrease the delta between each groups to within 2 so that they can be - differentially encoded */ - for (i = 1; i <= nb_groups; i++) - exp[i] = FFMIN(exp[i], exp[i-1] + 2); - i--; - while (--i >= 0) - exp[i] = FFMIN(exp[i], exp[i+1] + 2); - - if (cpl) - exp[-1] = exp[0] & ~1; - - /* now we have the exponent values the decoder will see */ - switch (exp_strategy) { - case EXP_D25: - for (i = nb_groups, k = (nb_groups * 2)-cpl; i > 0; i--) { - uint8_t exp1 = exp[i-cpl]; - exp[k--] = exp1; - exp[k--] = exp1; - } - break; - case EXP_D45: - for (i = nb_groups, k = (nb_groups * 4)-cpl; i > 0; i--) { - exp[k] = exp[k-1] = exp[k-2] = exp[k-3] = exp[i-cpl]; - k -= 4; - } - break; - } -} - - -/* - * Encode exponents from original extracted form to what the decoder will see. - * This copies and groups exponents based on exponent strategy and reduces - * deltas between adjacent exponent groups so that they can be differentially - * encoded. - */ -static void encode_exponents(AC3EncodeContext *s) -{ - int blk, blk1, ch, cpl; - uint8_t *exp, *exp_strategy; - int nb_coefs, num_reuse_blocks; - - for (ch = !s->cpl_on; ch <= s->channels; ch++) { - exp = s->blocks[0].exp[ch] + s->start_freq[ch]; - exp_strategy = s->exp_strategy[ch]; - - cpl = (ch == CPL_CH); - blk = 0; - while (blk < s->num_blocks) { - AC3Block *block = &s->blocks[blk]; - if (cpl && !block->cpl_in_use) { - exp += AC3_MAX_COEFS; - blk++; - continue; - } - nb_coefs = block->end_freq[ch] - s->start_freq[ch]; - blk1 = blk + 1; - - /* count the number of EXP_REUSE blocks after the current block - and set exponent reference block numbers */ - s->exp_ref_block[ch][blk] = blk; - while (blk1 < s->num_blocks && exp_strategy[blk1] == EXP_REUSE) { - s->exp_ref_block[ch][blk1] = blk; - blk1++; - } - num_reuse_blocks = blk1 - blk - 1; - - /* for the EXP_REUSE case we select the min of the exponents */ - s->ac3dsp.ac3_exponent_min(exp-s->start_freq[ch], num_reuse_blocks, - AC3_MAX_COEFS); - - encode_exponents_blk_ch(exp, nb_coefs, exp_strategy[blk], cpl); - - exp += AC3_MAX_COEFS * (num_reuse_blocks + 1); - blk = blk1; - } - } - - /* reference block numbers have been changed, so reset ref_bap_set */ - s->ref_bap_set = 0; -} - - -/* - * Count exponent bits based on bandwidth, coupling, and exponent strategies. - */ -static int count_exponent_bits(AC3EncodeContext *s) -{ - int blk, ch; - int nb_groups, bit_count; - - bit_count = 0; - for (blk = 0; blk < s->num_blocks; blk++) { - AC3Block *block = &s->blocks[blk]; - for (ch = !block->cpl_in_use; ch <= s->channels; ch++) { - int exp_strategy = s->exp_strategy[ch][blk]; - int cpl = (ch == CPL_CH); - int nb_coefs = block->end_freq[ch] - s->start_freq[ch]; - - if (exp_strategy == EXP_REUSE) - continue; - - nb_groups = exponent_group_tab[cpl][exp_strategy-1][nb_coefs]; - bit_count += 4 + (nb_groups * 7); - } - } - - return bit_count; -} - - -/** - * Group exponents. - * 3 delta-encoded exponents are in each 7-bit group. The number of groups - * varies depending on exponent strategy and bandwidth. - * - * @param s AC-3 encoder private context - */ -void ff_ac3_group_exponents(AC3EncodeContext *s) -{ - int blk, ch, i, cpl; - int group_size, nb_groups; - uint8_t *p; - int delta0, delta1, delta2; - int exp0, exp1; - - for (blk = 0; blk < s->num_blocks; blk++) { - AC3Block *block = &s->blocks[blk]; - for (ch = !block->cpl_in_use; ch <= s->channels; ch++) { - int exp_strategy = s->exp_strategy[ch][blk]; - if (exp_strategy == EXP_REUSE) - continue; - cpl = (ch == CPL_CH); - group_size = exp_strategy + (exp_strategy == EXP_D45); - nb_groups = exponent_group_tab[cpl][exp_strategy-1][block->end_freq[ch]-s->start_freq[ch]]; - p = block->exp[ch] + s->start_freq[ch] - cpl; - - /* DC exponent */ - exp1 = *p++; - block->grouped_exp[ch][0] = exp1; - - /* remaining exponents are delta encoded */ - for (i = 1; i <= nb_groups; i++) { - /* merge three delta in one code */ - exp0 = exp1; - exp1 = p[0]; - p += group_size; - delta0 = exp1 - exp0 + 2; - av_assert2(delta0 >= 0 && delta0 <= 4); - - exp0 = exp1; - exp1 = p[0]; - p += group_size; - delta1 = exp1 - exp0 + 2; - av_assert2(delta1 >= 0 && delta1 <= 4); - - exp0 = exp1; - exp1 = p[0]; - p += group_size; - delta2 = exp1 - exp0 + 2; - av_assert2(delta2 >= 0 && delta2 <= 4); - - block->grouped_exp[ch][i] = ((delta0 * 5 + delta1) * 5) + delta2; - } - } - } -} - - -/** - * Calculate final exponents from the supplied MDCT coefficients and exponent shift. - * Extract exponents from MDCT coefficients, calculate exponent strategies, - * and encode final exponents. - * - * @param s AC-3 encoder private context - */ -void ff_ac3_process_exponents(AC3EncodeContext *s) -{ - extract_exponents(s); - - compute_exp_strategy(s); - - encode_exponents(s); - - emms_c(); -} - - -/* - * Count frame bits that are based solely on fixed parameters. - * This only has to be run once when the encoder is initialized. - */ -static void count_frame_bits_fixed(AC3EncodeContext *s) -{ - static const int frame_bits_inc[8] = { 0, 0, 2, 2, 2, 4, 2, 4 }; - int blk; - int frame_bits; - - /* assumptions: - * no dynamic range codes - * bit allocation parameters do not change between blocks - * no delta bit allocation - * no skipped data - * no auxiliary data - * no E-AC-3 metadata - */ - - /* header */ - frame_bits = 16; /* sync info */ - if (s->eac3) { - /* bitstream info header */ - frame_bits += 35; - frame_bits += 1 + 1; - if (s->num_blocks != 0x6) - frame_bits++; - frame_bits++; - /* audio frame header */ - if (s->num_blocks == 6) - frame_bits += 2; - frame_bits += 10; - /* exponent strategy */ - if (s->use_frame_exp_strategy) - frame_bits += 5 * s->fbw_channels; - else - frame_bits += s->num_blocks * 2 * s->fbw_channels; - if (s->lfe_on) - frame_bits += s->num_blocks; - /* converter exponent strategy */ - if (s->num_blks_code != 0x3) - frame_bits++; - else - frame_bits += s->fbw_channels * 5; - /* snr offsets */ - frame_bits += 10; - /* block start info */ - if (s->num_blocks != 1) - frame_bits++; - } else { - frame_bits += 49; - frame_bits += frame_bits_inc[s->channel_mode]; - } - - /* audio blocks */ - for (blk = 0; blk < s->num_blocks; blk++) { - if (!s->eac3) { - /* block switch flags */ - frame_bits += s->fbw_channels; - - /* dither flags */ - frame_bits += s->fbw_channels; - } - - /* dynamic range */ - frame_bits++; - - /* spectral extension */ - if (s->eac3) - frame_bits++; - - if (!s->eac3) { - /* exponent strategy */ - frame_bits += 2 * s->fbw_channels; - if (s->lfe_on) - frame_bits++; - - /* bit allocation params */ - frame_bits++; - if (!blk) - frame_bits += 2 + 2 + 2 + 2 + 3; - } - - /* converter snr offset */ - if (s->eac3) - frame_bits++; - - if (!s->eac3) { - /* delta bit allocation */ - frame_bits++; - - /* skipped data */ - frame_bits++; - } - } - - /* auxiliary data */ - frame_bits++; - - /* CRC */ - frame_bits += 1 + 16; - - s->frame_bits_fixed = frame_bits; -} - - -/* - * Initialize bit allocation. - * Set default parameter codes and calculate parameter values. - */ -static void bit_alloc_init(AC3EncodeContext *s) -{ - int ch; - - /* init default parameters */ - s->slow_decay_code = 2; - s->fast_decay_code = 1; - s->slow_gain_code = 1; - s->db_per_bit_code = s->eac3 ? 2 : 3; - s->floor_code = 7; - for (ch = 0; ch <= s->channels; ch++) - s->fast_gain_code[ch] = 4; - - /* initial snr offset */ - s->coarse_snr_offset = 40; - - /* compute real values */ - /* currently none of these values change during encoding, so we can just - set them once at initialization */ - s->bit_alloc.slow_decay = ff_ac3_slow_decay_tab[s->slow_decay_code] >> s->bit_alloc.sr_shift; - s->bit_alloc.fast_decay = ff_ac3_fast_decay_tab[s->fast_decay_code] >> s->bit_alloc.sr_shift; - s->bit_alloc.slow_gain = ff_ac3_slow_gain_tab[s->slow_gain_code]; - s->bit_alloc.db_per_bit = ff_ac3_db_per_bit_tab[s->db_per_bit_code]; - s->bit_alloc.floor = ff_ac3_floor_tab[s->floor_code]; - s->bit_alloc.cpl_fast_leak = 0; - s->bit_alloc.cpl_slow_leak = 0; - - count_frame_bits_fixed(s); -} - - -/* - * Count the bits used to encode the frame, minus exponents and mantissas. - * Bits based on fixed parameters have already been counted, so now we just - * have to add the bits based on parameters that change during encoding. - */ -static void count_frame_bits(AC3EncodeContext *s) -{ - AC3EncOptions *opt = &s->options; - int blk, ch; - int frame_bits = 0; - - /* header */ - if (s->eac3) { - if (opt->eac3_mixing_metadata) { - if (s->channel_mode > AC3_CHMODE_STEREO) - frame_bits += 2; - if (s->has_center) - frame_bits += 6; - if (s->has_surround) - frame_bits += 6; - frame_bits += s->lfe_on; - frame_bits += 1 + 1 + 2; - if (s->channel_mode < AC3_CHMODE_STEREO) - frame_bits++; - frame_bits++; - } - if (opt->eac3_info_metadata) { - frame_bits += 3 + 1 + 1; - if (s->channel_mode == AC3_CHMODE_STEREO) - frame_bits += 2 + 2; - if (s->channel_mode >= AC3_CHMODE_2F2R) - frame_bits += 2; - frame_bits++; - if (opt->audio_production_info) - frame_bits += 5 + 2 + 1; - frame_bits++; - } - /* coupling */ - if (s->channel_mode > AC3_CHMODE_MONO) { - frame_bits++; - for (blk = 1; blk < s->num_blocks; blk++) { - AC3Block *block = &s->blocks[blk]; - frame_bits++; - if (block->new_cpl_strategy) - frame_bits++; - } - } - /* coupling exponent strategy */ - if (s->cpl_on) { - if (s->use_frame_exp_strategy) { - frame_bits += 5 * s->cpl_on; - } else { - for (blk = 0; blk < s->num_blocks; blk++) - frame_bits += 2 * s->blocks[blk].cpl_in_use; - } - } - } else { - if (opt->audio_production_info) - frame_bits += 7; - if (s->bitstream_id == 6) { - if (opt->extended_bsi_1) - frame_bits += 14; - if (opt->extended_bsi_2) - frame_bits += 14; - } - } - - /* audio blocks */ - for (blk = 0; blk < s->num_blocks; blk++) { - AC3Block *block = &s->blocks[blk]; - - /* coupling strategy */ - if (!s->eac3) - frame_bits++; - if (block->new_cpl_strategy) { - if (!s->eac3) - frame_bits++; - if (block->cpl_in_use) { - if (s->eac3) - frame_bits++; - if (!s->eac3 || s->channel_mode != AC3_CHMODE_STEREO) - frame_bits += s->fbw_channels; - if (s->channel_mode == AC3_CHMODE_STEREO) - frame_bits++; - frame_bits += 4 + 4; - if (s->eac3) - frame_bits++; - else - frame_bits += s->num_cpl_subbands - 1; - } - } - - /* coupling coordinates */ - if (block->cpl_in_use) { - for (ch = 1; ch <= s->fbw_channels; ch++) { - if (block->channel_in_cpl[ch]) { - if (!s->eac3 || block->new_cpl_coords[ch] != 2) - frame_bits++; - if (block->new_cpl_coords[ch]) { - frame_bits += 2; - frame_bits += (4 + 4) * s->num_cpl_bands; - } - } - } - } - - /* stereo rematrixing */ - if (s->channel_mode == AC3_CHMODE_STEREO) { - if (!s->eac3 || blk > 0) - frame_bits++; - if (s->blocks[blk].new_rematrixing_strategy) - frame_bits += block->num_rematrixing_bands; - } - - /* bandwidth codes & gain range */ - for (ch = 1; ch <= s->fbw_channels; ch++) { - if (s->exp_strategy[ch][blk] != EXP_REUSE) { - if (!block->channel_in_cpl[ch]) - frame_bits += 6; - frame_bits += 2; - } - } - - /* coupling exponent strategy */ - if (!s->eac3 && block->cpl_in_use) - frame_bits += 2; - - /* snr offsets and fast gain codes */ - if (!s->eac3) { - frame_bits++; - if (block->new_snr_offsets) - frame_bits += 6 + (s->channels + block->cpl_in_use) * (4 + 3); - } - - /* coupling leak info */ - if (block->cpl_in_use) { - if (!s->eac3 || block->new_cpl_leak != 2) - frame_bits++; - if (block->new_cpl_leak) - frame_bits += 3 + 3; - } - } - - s->frame_bits = s->frame_bits_fixed + frame_bits; -} - - -/* - * Calculate masking curve based on the final exponents. - * Also calculate the power spectral densities to use in future calculations. - */ -static void bit_alloc_masking(AC3EncodeContext *s) -{ - int blk, ch; - - for (blk = 0; blk < s->num_blocks; blk++) { - AC3Block *block = &s->blocks[blk]; - for (ch = !block->cpl_in_use; ch <= s->channels; ch++) { - /* We only need psd and mask for calculating bap. - Since we currently do not calculate bap when exponent - strategy is EXP_REUSE we do not need to calculate psd or mask. */ - if (s->exp_strategy[ch][blk] != EXP_REUSE) { - ff_ac3_bit_alloc_calc_psd(block->exp[ch], s->start_freq[ch], - block->end_freq[ch], block->psd[ch], - block->band_psd[ch]); - ff_ac3_bit_alloc_calc_mask(&s->bit_alloc, block->band_psd[ch], - s->start_freq[ch], block->end_freq[ch], - ff_ac3_fast_gain_tab[s->fast_gain_code[ch]], - ch == s->lfe_channel, - DBA_NONE, 0, NULL, NULL, NULL, - block->mask[ch]); - } - } - } -} - - -/* - * Ensure that bap for each block and channel point to the current bap_buffer. - * They may have been switched during the bit allocation search. - */ -static void reset_block_bap(AC3EncodeContext *s) -{ - int blk, ch; - uint8_t *ref_bap; - - if (s->ref_bap[0][0] == s->bap_buffer && s->ref_bap_set) - return; - - ref_bap = s->bap_buffer; - for (ch = 0; ch <= s->channels; ch++) { - for (blk = 0; blk < s->num_blocks; blk++) - s->ref_bap[ch][blk] = ref_bap + AC3_MAX_COEFS * s->exp_ref_block[ch][blk]; - ref_bap += AC3_MAX_COEFS * s->num_blocks; - } - s->ref_bap_set = 1; -} - - -/** - * Initialize mantissa counts. - * These are set so that they are padded to the next whole group size when bits - * are counted in compute_mantissa_size. - * - * @param[in,out] mant_cnt running counts for each bap value for each block - */ -static void count_mantissa_bits_init(uint16_t mant_cnt[AC3_MAX_BLOCKS][16]) -{ - int blk; - - for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) { - memset(mant_cnt[blk], 0, sizeof(mant_cnt[blk])); - mant_cnt[blk][1] = mant_cnt[blk][2] = 2; - mant_cnt[blk][4] = 1; - } -} - - -/** - * Update mantissa bit counts for all blocks in 1 channel in a given bandwidth - * range. - * - * @param s AC-3 encoder private context - * @param ch channel index - * @param[in,out] mant_cnt running counts for each bap value for each block - * @param start starting coefficient bin - * @param end ending coefficient bin - */ -static void count_mantissa_bits_update_ch(AC3EncodeContext *s, int ch, - uint16_t mant_cnt[AC3_MAX_BLOCKS][16], - int start, int end) -{ - int blk; - - for (blk = 0; blk < s->num_blocks; blk++) { - AC3Block *block = &s->blocks[blk]; - if (ch == CPL_CH && !block->cpl_in_use) - continue; - s->ac3dsp.update_bap_counts(mant_cnt[blk], - s->ref_bap[ch][blk] + start, - FFMIN(end, block->end_freq[ch]) - start); - } -} - - -/* - * Count the number of mantissa bits in the frame based on the bap values. - */ -static int count_mantissa_bits(AC3EncodeContext *s) -{ - int ch, max_end_freq; - LOCAL_ALIGNED_16(uint16_t, mant_cnt, [AC3_MAX_BLOCKS], [16]); - - count_mantissa_bits_init(mant_cnt); - - max_end_freq = s->bandwidth_code * 3 + 73; - for (ch = !s->cpl_enabled; ch <= s->channels; ch++) - count_mantissa_bits_update_ch(s, ch, mant_cnt, s->start_freq[ch], - max_end_freq); - - return s->ac3dsp.compute_mantissa_size(mant_cnt); -} - - -/** - * Run the bit allocation with a given SNR offset. - * This calculates the bit allocation pointers that will be used to determine - * the quantization of each mantissa. - * - * @param s AC-3 encoder private context - * @param snr_offset SNR offset, 0 to 1023 - * @return the number of bits needed for mantissas if the given SNR offset is - * is used. - */ -static int bit_alloc(AC3EncodeContext *s, int snr_offset) -{ - int blk, ch; - - snr_offset = (snr_offset - 240) << 2; - - reset_block_bap(s); - for (blk = 0; blk < s->num_blocks; blk++) { - AC3Block *block = &s->blocks[blk]; - - for (ch = !block->cpl_in_use; ch <= s->channels; ch++) { - /* Currently the only bit allocation parameters which vary across - blocks within a frame are the exponent values. We can take - advantage of that by reusing the bit allocation pointers - whenever we reuse exponents. */ - if (s->exp_strategy[ch][blk] != EXP_REUSE) { - s->ac3dsp.bit_alloc_calc_bap(block->mask[ch], block->psd[ch], - s->start_freq[ch], block->end_freq[ch], - snr_offset, s->bit_alloc.floor, - ff_ac3_bap_tab, s->ref_bap[ch][blk]); - } - } - } - return count_mantissa_bits(s); -} - - -/* - * Constant bitrate bit allocation search. - * Find the largest SNR offset that will allow data to fit in the frame. - */ -static int cbr_bit_allocation(AC3EncodeContext *s) -{ - int ch; - int bits_left; - int snr_offset, snr_incr; - - bits_left = 8 * s->frame_size - (s->frame_bits + s->exponent_bits); - if (bits_left < 0) - return AVERROR(EINVAL); - - snr_offset = s->coarse_snr_offset << 4; - - /* if previous frame SNR offset was 1023, check if current frame can also - use SNR offset of 1023. if so, skip the search. */ - if ((snr_offset | s->fine_snr_offset[1]) == 1023) { - if (bit_alloc(s, 1023) <= bits_left) - return 0; - } - - while (snr_offset >= 0 && - bit_alloc(s, snr_offset) > bits_left) { - snr_offset -= 64; - } - if (snr_offset < 0) - return AVERROR(EINVAL); - - FFSWAP(uint8_t *, s->bap_buffer, s->bap1_buffer); - for (snr_incr = 64; snr_incr > 0; snr_incr >>= 2) { - while (snr_offset + snr_incr <= 1023 && - bit_alloc(s, snr_offset + snr_incr) <= bits_left) { - snr_offset += snr_incr; - FFSWAP(uint8_t *, s->bap_buffer, s->bap1_buffer); - } - } - FFSWAP(uint8_t *, s->bap_buffer, s->bap1_buffer); - reset_block_bap(s); - - s->coarse_snr_offset = snr_offset >> 4; - for (ch = !s->cpl_on; ch <= s->channels; ch++) - s->fine_snr_offset[ch] = snr_offset & 0xF; - - return 0; -} - - -/* - * Perform bit allocation search. - * Finds the SNR offset value that maximizes quality and fits in the specified - * frame size. Output is the SNR offset and a set of bit allocation pointers - * used to quantize the mantissas. - */ -int ff_ac3_compute_bit_allocation(AC3EncodeContext *s) -{ - count_frame_bits(s); - - s->exponent_bits = count_exponent_bits(s); - - bit_alloc_masking(s); - - return cbr_bit_allocation(s); -} - - -/** - * Symmetric quantization on 'levels' levels. - * - * @param c unquantized coefficient - * @param e exponent - * @param levels number of quantization levels - * @return quantized coefficient - */ -static inline int sym_quant(int c, int e, int levels) -{ - int v = (((levels * c) >> (24 - e)) + levels) >> 1; - av_assert2(v >= 0 && v < levels); - return v; -} - - -/** - * Asymmetric quantization on 2^qbits levels. - * - * @param c unquantized coefficient - * @param e exponent - * @param qbits number of quantization bits - * @return quantized coefficient - */ -static inline int asym_quant(int c, int e, int qbits) -{ - int m; - - c = (((c << e) >> (24 - qbits)) + 1) >> 1; - m = (1 << (qbits-1)); - if (c >= m) - c = m - 1; - av_assert2(c >= -m); - return c; -} - - -/** - * Quantize a set of mantissas for a single channel in a single block. - * - * @param s Mantissa count context - * @param fixed_coef unquantized fixed-point coefficients - * @param exp exponents - * @param bap bit allocation pointer indices - * @param[out] qmant quantized coefficients - * @param start_freq starting coefficient bin - * @param end_freq ending coefficient bin - */ -static void quantize_mantissas_blk_ch(AC3Mant *s, int32_t *fixed_coef, - uint8_t *exp, uint8_t *bap, - int16_t *qmant, int start_freq, - int end_freq) -{ - int i; - - for (i = start_freq; i < end_freq; i++) { - int c = fixed_coef[i]; - int e = exp[i]; - int v = bap[i]; - if (v) - switch (v) { - case 1: - v = sym_quant(c, e, 3); - switch (s->mant1_cnt) { - case 0: - s->qmant1_ptr = &qmant[i]; - v = 9 * v; - s->mant1_cnt = 1; - break; - case 1: - *s->qmant1_ptr += 3 * v; - s->mant1_cnt = 2; - v = 128; - break; - default: - *s->qmant1_ptr += v; - s->mant1_cnt = 0; - v = 128; - break; - } - break; - case 2: - v = sym_quant(c, e, 5); - switch (s->mant2_cnt) { - case 0: - s->qmant2_ptr = &qmant[i]; - v = 25 * v; - s->mant2_cnt = 1; - break; - case 1: - *s->qmant2_ptr += 5 * v; - s->mant2_cnt = 2; - v = 128; - break; - default: - *s->qmant2_ptr += v; - s->mant2_cnt = 0; - v = 128; - break; - } - break; - case 3: - v = sym_quant(c, e, 7); - break; - case 4: - v = sym_quant(c, e, 11); - switch (s->mant4_cnt) { - case 0: - s->qmant4_ptr = &qmant[i]; - v = 11 * v; - s->mant4_cnt = 1; - break; - default: - *s->qmant4_ptr += v; - s->mant4_cnt = 0; - v = 128; - break; - } - break; - case 5: - v = sym_quant(c, e, 15); - break; - case 14: - v = asym_quant(c, e, 14); - break; - case 15: - v = asym_quant(c, e, 16); - break; - default: - v = asym_quant(c, e, v - 1); - break; - } - qmant[i] = v; - } -} - - -/** - * Quantize mantissas using coefficients, exponents, and bit allocation pointers. - * - * @param s AC-3 encoder private context - */ -void ff_ac3_quantize_mantissas(AC3EncodeContext *s) -{ - int blk, ch, ch0=0, got_cpl; - - for (blk = 0; blk < s->num_blocks; blk++) { - AC3Block *block = &s->blocks[blk]; - AC3Mant m = { 0 }; - - got_cpl = !block->cpl_in_use; - for (ch = 1; ch <= s->channels; ch++) { - if (!got_cpl && ch > 1 && block->channel_in_cpl[ch-1]) { - ch0 = ch - 1; - ch = CPL_CH; - got_cpl = 1; - } - quantize_mantissas_blk_ch(&m, block->fixed_coef[ch], - s->blocks[s->exp_ref_block[ch][blk]].exp[ch], - s->ref_bap[ch][blk], block->qmant[ch], - s->start_freq[ch], block->end_freq[ch]); - if (ch == CPL_CH) - ch = ch0; - } - } -} - - -/* - * Write the AC-3 frame header to the output bitstream. - */ -static void ac3_output_frame_header(AC3EncodeContext *s) -{ - AC3EncOptions *opt = &s->options; - - put_bits(&s->pb, 16, 0x0b77); /* frame header */ - put_bits(&s->pb, 16, 0); /* crc1: will be filled later */ - put_bits(&s->pb, 2, s->bit_alloc.sr_code); - put_bits(&s->pb, 6, s->frame_size_code + (s->frame_size - s->frame_size_min) / 2); - put_bits(&s->pb, 5, s->bitstream_id); - put_bits(&s->pb, 3, s->bitstream_mode); - put_bits(&s->pb, 3, s->channel_mode); - if ((s->channel_mode & 0x01) && s->channel_mode != AC3_CHMODE_MONO) - put_bits(&s->pb, 2, s->center_mix_level); - if (s->channel_mode & 0x04) - put_bits(&s->pb, 2, s->surround_mix_level); - if (s->channel_mode == AC3_CHMODE_STEREO) - put_bits(&s->pb, 2, opt->dolby_surround_mode); - put_bits(&s->pb, 1, s->lfe_on); /* LFE */ - put_bits(&s->pb, 5, -opt->dialogue_level); - put_bits(&s->pb, 1, 0); /* no compression control word */ - put_bits(&s->pb, 1, 0); /* no lang code */ - put_bits(&s->pb, 1, opt->audio_production_info); - if (opt->audio_production_info) { - put_bits(&s->pb, 5, opt->mixing_level - 80); - put_bits(&s->pb, 2, opt->room_type); - } - put_bits(&s->pb, 1, opt->copyright); - put_bits(&s->pb, 1, opt->original); - if (s->bitstream_id == 6) { - /* alternate bit stream syntax */ - put_bits(&s->pb, 1, opt->extended_bsi_1); - if (opt->extended_bsi_1) { - put_bits(&s->pb, 2, opt->preferred_stereo_downmix); - put_bits(&s->pb, 3, s->ltrt_center_mix_level); - put_bits(&s->pb, 3, s->ltrt_surround_mix_level); - put_bits(&s->pb, 3, s->loro_center_mix_level); - put_bits(&s->pb, 3, s->loro_surround_mix_level); - } - put_bits(&s->pb, 1, opt->extended_bsi_2); - if (opt->extended_bsi_2) { - put_bits(&s->pb, 2, opt->dolby_surround_ex_mode); - put_bits(&s->pb, 2, opt->dolby_headphone_mode); - put_bits(&s->pb, 1, opt->ad_converter_type); - put_bits(&s->pb, 9, 0); /* xbsi2 and encinfo : reserved */ - } - } else { - put_bits(&s->pb, 1, 0); /* no time code 1 */ - put_bits(&s->pb, 1, 0); /* no time code 2 */ - } - put_bits(&s->pb, 1, 0); /* no additional bit stream info */ -} - - -/* - * Write one audio block to the output bitstream. - */ -static void output_audio_block(AC3EncodeContext *s, int blk) -{ - int ch, i, baie, bnd, got_cpl, ch0; - AC3Block *block = &s->blocks[blk]; - - /* block switching */ - if (!s->eac3) { - for (ch = 0; ch < s->fbw_channels; ch++) - put_bits(&s->pb, 1, 0); - } - - /* dither flags */ - if (!s->eac3) { - for (ch = 0; ch < s->fbw_channels; ch++) - put_bits(&s->pb, 1, 1); - } - - /* dynamic range codes */ - put_bits(&s->pb, 1, 0); - - /* spectral extension */ - if (s->eac3) - put_bits(&s->pb, 1, 0); - - /* channel coupling */ - if (!s->eac3) - put_bits(&s->pb, 1, block->new_cpl_strategy); - if (block->new_cpl_strategy) { - if (!s->eac3) - put_bits(&s->pb, 1, block->cpl_in_use); - if (block->cpl_in_use) { - int start_sub, end_sub; - if (s->eac3) - put_bits(&s->pb, 1, 0); /* enhanced coupling */ - if (!s->eac3 || s->channel_mode != AC3_CHMODE_STEREO) { - for (ch = 1; ch <= s->fbw_channels; ch++) - put_bits(&s->pb, 1, block->channel_in_cpl[ch]); - } - if (s->channel_mode == AC3_CHMODE_STEREO) - put_bits(&s->pb, 1, 0); /* phase flags in use */ - start_sub = (s->start_freq[CPL_CH] - 37) / 12; - end_sub = (s->cpl_end_freq - 37) / 12; - put_bits(&s->pb, 4, start_sub); - put_bits(&s->pb, 4, end_sub - 3); - /* coupling band structure */ - if (s->eac3) { - put_bits(&s->pb, 1, 0); /* use default */ - } else { - for (bnd = start_sub+1; bnd < end_sub; bnd++) - put_bits(&s->pb, 1, ff_eac3_default_cpl_band_struct[bnd]); - } - } - } - - /* coupling coordinates */ - if (block->cpl_in_use) { - for (ch = 1; ch <= s->fbw_channels; ch++) { - if (block->channel_in_cpl[ch]) { - if (!s->eac3 || block->new_cpl_coords[ch] != 2) - put_bits(&s->pb, 1, block->new_cpl_coords[ch]); - if (block->new_cpl_coords[ch]) { - put_bits(&s->pb, 2, block->cpl_master_exp[ch]); - for (bnd = 0; bnd < s->num_cpl_bands; bnd++) { - put_bits(&s->pb, 4, block->cpl_coord_exp [ch][bnd]); - put_bits(&s->pb, 4, block->cpl_coord_mant[ch][bnd]); - } - } - } - } - } - - /* stereo rematrixing */ - if (s->channel_mode == AC3_CHMODE_STEREO) { - if (!s->eac3 || blk > 0) - put_bits(&s->pb, 1, block->new_rematrixing_strategy); - if (block->new_rematrixing_strategy) { - /* rematrixing flags */ - for (bnd = 0; bnd < block->num_rematrixing_bands; bnd++) - put_bits(&s->pb, 1, block->rematrixing_flags[bnd]); - } - } - - /* exponent strategy */ - if (!s->eac3) { - for (ch = !block->cpl_in_use; ch <= s->fbw_channels; ch++) - put_bits(&s->pb, 2, s->exp_strategy[ch][blk]); - if (s->lfe_on) - put_bits(&s->pb, 1, s->exp_strategy[s->lfe_channel][blk]); - } - - /* bandwidth */ - for (ch = 1; ch <= s->fbw_channels; ch++) { - if (s->exp_strategy[ch][blk] != EXP_REUSE && !block->channel_in_cpl[ch]) - put_bits(&s->pb, 6, s->bandwidth_code); - } - - /* exponents */ - for (ch = !block->cpl_in_use; ch <= s->channels; ch++) { - int nb_groups; - int cpl = (ch == CPL_CH); - - if (s->exp_strategy[ch][blk] == EXP_REUSE) - continue; - - /* DC exponent */ - put_bits(&s->pb, 4, block->grouped_exp[ch][0] >> cpl); - - /* exponent groups */ - nb_groups = exponent_group_tab[cpl][s->exp_strategy[ch][blk]-1][block->end_freq[ch]-s->start_freq[ch]]; - for (i = 1; i <= nb_groups; i++) - put_bits(&s->pb, 7, block->grouped_exp[ch][i]); - - /* gain range info */ - if (ch != s->lfe_channel && !cpl) - put_bits(&s->pb, 2, 0); - } - - /* bit allocation info */ - if (!s->eac3) { - baie = (blk == 0); - put_bits(&s->pb, 1, baie); - if (baie) { - put_bits(&s->pb, 2, s->slow_decay_code); - put_bits(&s->pb, 2, s->fast_decay_code); - put_bits(&s->pb, 2, s->slow_gain_code); - put_bits(&s->pb, 2, s->db_per_bit_code); - put_bits(&s->pb, 3, s->floor_code); - } - } - - /* snr offset */ - if (!s->eac3) { - put_bits(&s->pb, 1, block->new_snr_offsets); - if (block->new_snr_offsets) { - put_bits(&s->pb, 6, s->coarse_snr_offset); - for (ch = !block->cpl_in_use; ch <= s->channels; ch++) { - put_bits(&s->pb, 4, s->fine_snr_offset[ch]); - put_bits(&s->pb, 3, s->fast_gain_code[ch]); - } - } - } else { - put_bits(&s->pb, 1, 0); /* no converter snr offset */ - } - - /* coupling leak */ - if (block->cpl_in_use) { - if (!s->eac3 || block->new_cpl_leak != 2) - put_bits(&s->pb, 1, block->new_cpl_leak); - if (block->new_cpl_leak) { - put_bits(&s->pb, 3, s->bit_alloc.cpl_fast_leak); - put_bits(&s->pb, 3, s->bit_alloc.cpl_slow_leak); - } - } - - if (!s->eac3) { - put_bits(&s->pb, 1, 0); /* no delta bit allocation */ - put_bits(&s->pb, 1, 0); /* no data to skip */ - } - - /* mantissas */ - got_cpl = !block->cpl_in_use; - for (ch = 1; ch <= s->channels; ch++) { - int b, q; - - if (!got_cpl && ch > 1 && block->channel_in_cpl[ch-1]) { - ch0 = ch - 1; - ch = CPL_CH; - got_cpl = 1; - } - for (i = s->start_freq[ch]; i < block->end_freq[ch]; i++) { - q = block->qmant[ch][i]; - b = s->ref_bap[ch][blk][i]; - switch (b) { - case 0: break; - case 1: if (q != 128) put_bits (&s->pb, 5, q); break; - case 2: if (q != 128) put_bits (&s->pb, 7, q); break; - case 3: put_sbits(&s->pb, 3, q); break; - case 4: if (q != 128) put_bits (&s->pb, 7, q); break; - case 14: put_sbits(&s->pb, 14, q); break; - case 15: put_sbits(&s->pb, 16, q); break; - default: put_sbits(&s->pb, b-1, q); break; - } - } - if (ch == CPL_CH) - ch = ch0; - } -} - - -/** CRC-16 Polynomial */ -#define CRC16_POLY ((1 << 0) | (1 << 2) | (1 << 15) | (1 << 16)) - - -static unsigned int mul_poly(unsigned int a, unsigned int b, unsigned int poly) -{ - unsigned int c; - - c = 0; - while (a) { - if (a & 1) - c ^= b; - a = a >> 1; - b = b << 1; - if (b & (1 << 16)) - b ^= poly; - } - return c; -} - - -static unsigned int pow_poly(unsigned int a, unsigned int n, unsigned int poly) -{ - unsigned int r; - r = 1; - while (n) { - if (n & 1) - r = mul_poly(r, a, poly); - a = mul_poly(a, a, poly); - n >>= 1; - } - return r; -} - - -/* - * Fill the end of the frame with 0's and compute the two CRCs. - */ -static void output_frame_end(AC3EncodeContext *s) -{ - const AVCRC *crc_ctx = av_crc_get_table(AV_CRC_16_ANSI); - int frame_size_58, pad_bytes, crc1, crc2_partial, crc2, crc_inv; - uint8_t *frame; - - frame_size_58 = ((s->frame_size >> 2) + (s->frame_size >> 4)) << 1; - - /* pad the remainder of the frame with zeros */ - av_assert2(s->frame_size * 8 - put_bits_count(&s->pb) >= 18); - flush_put_bits(&s->pb); - frame = s->pb.buf; - pad_bytes = s->frame_size - (put_bits_ptr(&s->pb) - frame) - 2; - av_assert2(pad_bytes >= 0); - if (pad_bytes > 0) - memset(put_bits_ptr(&s->pb), 0, pad_bytes); - - if (s->eac3) { - /* compute crc2 */ - crc2_partial = av_crc(crc_ctx, 0, frame + 2, s->frame_size - 5); - } else { - /* compute crc1 */ - /* this is not so easy because it is at the beginning of the data... */ - crc1 = av_bswap16(av_crc(crc_ctx, 0, frame + 4, frame_size_58 - 4)); - crc_inv = s->crc_inv[s->frame_size > s->frame_size_min]; - crc1 = mul_poly(crc_inv, crc1, CRC16_POLY); - AV_WB16(frame + 2, crc1); - - /* compute crc2 */ - crc2_partial = av_crc(crc_ctx, 0, frame + frame_size_58, - s->frame_size - frame_size_58 - 3); - } - crc2 = av_crc(crc_ctx, crc2_partial, frame + s->frame_size - 3, 1); - /* ensure crc2 does not match sync word by flipping crcrsv bit if needed */ - if (crc2 == 0x770B) { - frame[s->frame_size - 3] ^= 0x1; - crc2 = av_crc(crc_ctx, crc2_partial, frame + s->frame_size - 3, 1); - } - crc2 = av_bswap16(crc2); - AV_WB16(frame + s->frame_size - 2, crc2); -} - - -/** - * Write the frame to the output bitstream. - * - * @param s AC-3 encoder private context - * @param frame output data buffer - */ -void ff_ac3_output_frame(AC3EncodeContext *s, unsigned char *frame) -{ - int blk; - - init_put_bits(&s->pb, frame, AC3_MAX_CODED_FRAME_SIZE); - - s->output_frame_header(s); - - for (blk = 0; blk < s->num_blocks; blk++) - output_audio_block(s, blk); - - output_frame_end(s); -} - - -static void dprint_options(AC3EncodeContext *s) -{ -#ifdef DEBUG - AVCodecContext *avctx = s->avctx; - AC3EncOptions *opt = &s->options; - char strbuf[32]; - - switch (s->bitstream_id) { - case 6: av_strlcpy(strbuf, "AC-3 (alt syntax)", 32); break; - case 8: av_strlcpy(strbuf, "AC-3 (standard)", 32); break; - case 9: av_strlcpy(strbuf, "AC-3 (dnet half-rate)", 32); break; - case 10: av_strlcpy(strbuf, "AC-3 (dnet quater-rate)", 32); break; - case 16: av_strlcpy(strbuf, "E-AC-3 (enhanced)", 32); break; - default: snprintf(strbuf, 32, "ERROR"); - } - av_dlog(avctx, "bitstream_id: %s (%d)\n", strbuf, s->bitstream_id); - av_dlog(avctx, "sample_fmt: %s\n", av_get_sample_fmt_name(avctx->sample_fmt)); - av_get_channel_layout_string(strbuf, 32, s->channels, avctx->channel_layout); - av_dlog(avctx, "channel_layout: %s\n", strbuf); - av_dlog(avctx, "sample_rate: %d\n", s->sample_rate); - av_dlog(avctx, "bit_rate: %d\n", s->bit_rate); - av_dlog(avctx, "blocks/frame: %d (code=%d)\n", s->num_blocks, s->num_blks_code); - if (s->cutoff) - av_dlog(avctx, "cutoff: %d\n", s->cutoff); - - av_dlog(avctx, "per_frame_metadata: %s\n", - opt->allow_per_frame_metadata?"on":"off"); - if (s->has_center) - av_dlog(avctx, "center_mixlev: %0.3f (%d)\n", opt->center_mix_level, - s->center_mix_level); - else - av_dlog(avctx, "center_mixlev: {not written}\n"); - if (s->has_surround) - av_dlog(avctx, "surround_mixlev: %0.3f (%d)\n", opt->surround_mix_level, - s->surround_mix_level); - else - av_dlog(avctx, "surround_mixlev: {not written}\n"); - if (opt->audio_production_info) { - av_dlog(avctx, "mixing_level: %ddB\n", opt->mixing_level); - switch (opt->room_type) { - case AC3ENC_OPT_NOT_INDICATED: av_strlcpy(strbuf, "notindicated", 32); break; - case AC3ENC_OPT_LARGE_ROOM: av_strlcpy(strbuf, "large", 32); break; - case AC3ENC_OPT_SMALL_ROOM: av_strlcpy(strbuf, "small", 32); break; - default: snprintf(strbuf, 32, "ERROR (%d)", opt->room_type); - } - av_dlog(avctx, "room_type: %s\n", strbuf); - } else { - av_dlog(avctx, "mixing_level: {not written}\n"); - av_dlog(avctx, "room_type: {not written}\n"); - } - av_dlog(avctx, "copyright: %s\n", opt->copyright?"on":"off"); - av_dlog(avctx, "dialnorm: %ddB\n", opt->dialogue_level); - if (s->channel_mode == AC3_CHMODE_STEREO) { - switch (opt->dolby_surround_mode) { - case AC3ENC_OPT_NOT_INDICATED: av_strlcpy(strbuf, "notindicated", 32); break; - case AC3ENC_OPT_MODE_ON: av_strlcpy(strbuf, "on", 32); break; - case AC3ENC_OPT_MODE_OFF: av_strlcpy(strbuf, "off", 32); break; - default: snprintf(strbuf, 32, "ERROR (%d)", opt->dolby_surround_mode); - } - av_dlog(avctx, "dsur_mode: %s\n", strbuf); - } else { - av_dlog(avctx, "dsur_mode: {not written}\n"); - } - av_dlog(avctx, "original: %s\n", opt->original?"on":"off"); - - if (s->bitstream_id == 6) { - if (opt->extended_bsi_1) { - switch (opt->preferred_stereo_downmix) { - case AC3ENC_OPT_NOT_INDICATED: av_strlcpy(strbuf, "notindicated", 32); break; - case AC3ENC_OPT_DOWNMIX_LTRT: av_strlcpy(strbuf, "ltrt", 32); break; - case AC3ENC_OPT_DOWNMIX_LORO: av_strlcpy(strbuf, "loro", 32); break; - default: snprintf(strbuf, 32, "ERROR (%d)", opt->preferred_stereo_downmix); - } - av_dlog(avctx, "dmix_mode: %s\n", strbuf); - av_dlog(avctx, "ltrt_cmixlev: %0.3f (%d)\n", - opt->ltrt_center_mix_level, s->ltrt_center_mix_level); - av_dlog(avctx, "ltrt_surmixlev: %0.3f (%d)\n", - opt->ltrt_surround_mix_level, s->ltrt_surround_mix_level); - av_dlog(avctx, "loro_cmixlev: %0.3f (%d)\n", - opt->loro_center_mix_level, s->loro_center_mix_level); - av_dlog(avctx, "loro_surmixlev: %0.3f (%d)\n", - opt->loro_surround_mix_level, s->loro_surround_mix_level); - } else { - av_dlog(avctx, "extended bitstream info 1: {not written}\n"); - } - if (opt->extended_bsi_2) { - switch (opt->dolby_surround_ex_mode) { - case AC3ENC_OPT_NOT_INDICATED: av_strlcpy(strbuf, "notindicated", 32); break; - case AC3ENC_OPT_MODE_ON: av_strlcpy(strbuf, "on", 32); break; - case AC3ENC_OPT_MODE_OFF: av_strlcpy(strbuf, "off", 32); break; - default: snprintf(strbuf, 32, "ERROR (%d)", opt->dolby_surround_ex_mode); - } - av_dlog(avctx, "dsurex_mode: %s\n", strbuf); - switch (opt->dolby_headphone_mode) { - case AC3ENC_OPT_NOT_INDICATED: av_strlcpy(strbuf, "notindicated", 32); break; - case AC3ENC_OPT_MODE_ON: av_strlcpy(strbuf, "on", 32); break; - case AC3ENC_OPT_MODE_OFF: av_strlcpy(strbuf, "off", 32); break; - default: snprintf(strbuf, 32, "ERROR (%d)", opt->dolby_headphone_mode); - } - av_dlog(avctx, "dheadphone_mode: %s\n", strbuf); - - switch (opt->ad_converter_type) { - case AC3ENC_OPT_ADCONV_STANDARD: av_strlcpy(strbuf, "standard", 32); break; - case AC3ENC_OPT_ADCONV_HDCD: av_strlcpy(strbuf, "hdcd", 32); break; - default: snprintf(strbuf, 32, "ERROR (%d)", opt->ad_converter_type); - } - av_dlog(avctx, "ad_conv_type: %s\n", strbuf); - } else { - av_dlog(avctx, "extended bitstream info 2: {not written}\n"); - } - } -#endif -} - - -#define FLT_OPTION_THRESHOLD 0.01 - -static int validate_float_option(float v, const float *v_list, int v_list_size) -{ - int i; - - for (i = 0; i < v_list_size; i++) { - if (v < (v_list[i] + FLT_OPTION_THRESHOLD) && - v > (v_list[i] - FLT_OPTION_THRESHOLD)) - break; - } - if (i == v_list_size) - return -1; - - return i; -} - - -static void validate_mix_level(void *log_ctx, const char *opt_name, - float *opt_param, const float *list, - int list_size, int default_value, int min_value, - int *ctx_param) -{ - int mixlev = validate_float_option(*opt_param, list, list_size); - if (mixlev < min_value) { - mixlev = default_value; - if (*opt_param >= 0.0) { - av_log(log_ctx, AV_LOG_WARNING, "requested %s is not valid. using " - "default value: %0.3f\n", opt_name, list[mixlev]); - } - } - *opt_param = list[mixlev]; - *ctx_param = mixlev; -} - - -/** - * Validate metadata options as set by AVOption system. - * These values can optionally be changed per-frame. - * - * @param s AC-3 encoder private context - */ -int ff_ac3_validate_metadata(AC3EncodeContext *s) -{ - AVCodecContext *avctx = s->avctx; - AC3EncOptions *opt = &s->options; - - opt->audio_production_info = 0; - opt->extended_bsi_1 = 0; - opt->extended_bsi_2 = 0; - opt->eac3_mixing_metadata = 0; - opt->eac3_info_metadata = 0; - - /* determine mixing metadata / xbsi1 use */ - if (s->channel_mode > AC3_CHMODE_STEREO && opt->preferred_stereo_downmix != AC3ENC_OPT_NONE) { - opt->extended_bsi_1 = 1; - opt->eac3_mixing_metadata = 1; - } - if (s->has_center && - (opt->ltrt_center_mix_level >= 0 || opt->loro_center_mix_level >= 0)) { - opt->extended_bsi_1 = 1; - opt->eac3_mixing_metadata = 1; - } - if (s->has_surround && - (opt->ltrt_surround_mix_level >= 0 || opt->loro_surround_mix_level >= 0)) { - opt->extended_bsi_1 = 1; - opt->eac3_mixing_metadata = 1; - } - - if (s->eac3) { - /* determine info metadata use */ - if (avctx->audio_service_type != AV_AUDIO_SERVICE_TYPE_MAIN) - opt->eac3_info_metadata = 1; - if (opt->copyright != AC3ENC_OPT_NONE || opt->original != AC3ENC_OPT_NONE) - opt->eac3_info_metadata = 1; - if (s->channel_mode == AC3_CHMODE_STEREO && - (opt->dolby_headphone_mode != AC3ENC_OPT_NONE || opt->dolby_surround_mode != AC3ENC_OPT_NONE)) - opt->eac3_info_metadata = 1; - if (s->channel_mode >= AC3_CHMODE_2F2R && opt->dolby_surround_ex_mode != AC3ENC_OPT_NONE) - opt->eac3_info_metadata = 1; - if (opt->mixing_level != AC3ENC_OPT_NONE || opt->room_type != AC3ENC_OPT_NONE || - opt->ad_converter_type != AC3ENC_OPT_NONE) { - opt->audio_production_info = 1; - opt->eac3_info_metadata = 1; - } - } else { - /* determine audio production info use */ - if (opt->mixing_level != AC3ENC_OPT_NONE || opt->room_type != AC3ENC_OPT_NONE) - opt->audio_production_info = 1; - - /* determine xbsi2 use */ - if (s->channel_mode >= AC3_CHMODE_2F2R && opt->dolby_surround_ex_mode != AC3ENC_OPT_NONE) - opt->extended_bsi_2 = 1; - if (s->channel_mode == AC3_CHMODE_STEREO && opt->dolby_headphone_mode != AC3ENC_OPT_NONE) - opt->extended_bsi_2 = 1; - if (opt->ad_converter_type != AC3ENC_OPT_NONE) - opt->extended_bsi_2 = 1; - } - - /* validate AC-3 mixing levels */ - if (!s->eac3) { - if (s->has_center) { - validate_mix_level(avctx, "center_mix_level", &opt->center_mix_level, - cmixlev_options, CMIXLEV_NUM_OPTIONS, 1, 0, - &s->center_mix_level); - } - if (s->has_surround) { - validate_mix_level(avctx, "surround_mix_level", &opt->surround_mix_level, - surmixlev_options, SURMIXLEV_NUM_OPTIONS, 1, 0, - &s->surround_mix_level); - } - } - - /* validate extended bsi 1 / mixing metadata */ - if (opt->extended_bsi_1 || opt->eac3_mixing_metadata) { - /* default preferred stereo downmix */ - if (opt->preferred_stereo_downmix == AC3ENC_OPT_NONE) - opt->preferred_stereo_downmix = AC3ENC_OPT_NOT_INDICATED; - if (!s->eac3 || s->has_center) { - /* validate Lt/Rt center mix level */ - validate_mix_level(avctx, "ltrt_center_mix_level", - &opt->ltrt_center_mix_level, extmixlev_options, - EXTMIXLEV_NUM_OPTIONS, 5, 0, - &s->ltrt_center_mix_level); - /* validate Lo/Ro center mix level */ - validate_mix_level(avctx, "loro_center_mix_level", - &opt->loro_center_mix_level, extmixlev_options, - EXTMIXLEV_NUM_OPTIONS, 5, 0, - &s->loro_center_mix_level); - } - if (!s->eac3 || s->has_surround) { - /* validate Lt/Rt surround mix level */ - validate_mix_level(avctx, "ltrt_surround_mix_level", - &opt->ltrt_surround_mix_level, extmixlev_options, - EXTMIXLEV_NUM_OPTIONS, 6, 3, - &s->ltrt_surround_mix_level); - /* validate Lo/Ro surround mix level */ - validate_mix_level(avctx, "loro_surround_mix_level", - &opt->loro_surround_mix_level, extmixlev_options, - EXTMIXLEV_NUM_OPTIONS, 6, 3, - &s->loro_surround_mix_level); - } - } - - /* validate audio service type / channels combination */ - if ((avctx->audio_service_type == AV_AUDIO_SERVICE_TYPE_KARAOKE && - avctx->channels == 1) || - ((avctx->audio_service_type == AV_AUDIO_SERVICE_TYPE_COMMENTARY || - avctx->audio_service_type == AV_AUDIO_SERVICE_TYPE_EMERGENCY || - avctx->audio_service_type == AV_AUDIO_SERVICE_TYPE_VOICE_OVER) - && avctx->channels > 1)) { - av_log(avctx, AV_LOG_ERROR, "invalid audio service type for the " - "specified number of channels\n"); - return AVERROR(EINVAL); - } - - /* validate extended bsi 2 / info metadata */ - if (opt->extended_bsi_2 || opt->eac3_info_metadata) { - /* default dolby headphone mode */ - if (opt->dolby_headphone_mode == AC3ENC_OPT_NONE) - opt->dolby_headphone_mode = AC3ENC_OPT_NOT_INDICATED; - /* default dolby surround ex mode */ - if (opt->dolby_surround_ex_mode == AC3ENC_OPT_NONE) - opt->dolby_surround_ex_mode = AC3ENC_OPT_NOT_INDICATED; - /* default A/D converter type */ - if (opt->ad_converter_type == AC3ENC_OPT_NONE) - opt->ad_converter_type = AC3ENC_OPT_ADCONV_STANDARD; - } - - /* copyright & original defaults */ - if (!s->eac3 || opt->eac3_info_metadata) { - /* default copyright */ - if (opt->copyright == AC3ENC_OPT_NONE) - opt->copyright = AC3ENC_OPT_OFF; - /* default original */ - if (opt->original == AC3ENC_OPT_NONE) - opt->original = AC3ENC_OPT_ON; - } - - /* dolby surround mode default */ - if (!s->eac3 || opt->eac3_info_metadata) { - if (opt->dolby_surround_mode == AC3ENC_OPT_NONE) - opt->dolby_surround_mode = AC3ENC_OPT_NOT_INDICATED; - } - - /* validate audio production info */ - if (opt->audio_production_info) { - if (opt->mixing_level == AC3ENC_OPT_NONE) { - av_log(avctx, AV_LOG_ERROR, "mixing_level must be set if " - "room_type is set\n"); - return AVERROR(EINVAL); - } - if (opt->mixing_level < 80) { - av_log(avctx, AV_LOG_ERROR, "invalid mixing level. must be between " - "80dB and 111dB\n"); - return AVERROR(EINVAL); - } - /* default room type */ - if (opt->room_type == AC3ENC_OPT_NONE) - opt->room_type = AC3ENC_OPT_NOT_INDICATED; - } - - /* set bitstream id for alternate bitstream syntax */ - if (!s->eac3 && (opt->extended_bsi_1 || opt->extended_bsi_2)) { - if (s->bitstream_id > 8 && s->bitstream_id < 11) { - static int warn_once = 1; - if (warn_once) { - av_log(avctx, AV_LOG_WARNING, "alternate bitstream syntax is " - "not compatible with reduced samplerates. writing of " - "extended bitstream information will be disabled.\n"); - warn_once = 0; - } - } else { - s->bitstream_id = 6; - } - } - - return 0; -} - - -/** - * Finalize encoding and free any memory allocated by the encoder. - * - * @param avctx Codec context - */ -av_cold int ff_ac3_encode_close(AVCodecContext *avctx) -{ - int blk, ch; - AC3EncodeContext *s = avctx->priv_data; - - av_freep(&s->windowed_samples); - for (ch = 0; ch < s->channels; ch++) - av_freep(&s->planar_samples[ch]); - av_freep(&s->planar_samples); - av_freep(&s->bap_buffer); - av_freep(&s->bap1_buffer); - av_freep(&s->mdct_coef_buffer); - av_freep(&s->fixed_coef_buffer); - av_freep(&s->exp_buffer); - av_freep(&s->grouped_exp_buffer); - av_freep(&s->psd_buffer); - av_freep(&s->band_psd_buffer); - av_freep(&s->mask_buffer); - av_freep(&s->qmant_buffer); - av_freep(&s->cpl_coord_exp_buffer); - av_freep(&s->cpl_coord_mant_buffer); - for (blk = 0; blk < s->num_blocks; blk++) { - AC3Block *block = &s->blocks[blk]; - av_freep(&block->mdct_coef); - av_freep(&block->fixed_coef); - av_freep(&block->exp); - av_freep(&block->grouped_exp); - av_freep(&block->psd); - av_freep(&block->band_psd); - av_freep(&block->mask); - av_freep(&block->qmant); - av_freep(&block->cpl_coord_exp); - av_freep(&block->cpl_coord_mant); - } - - s->mdct_end(s); - - return 0; -} - - -/* - * Set channel information during initialization. - */ -static av_cold int set_channel_info(AC3EncodeContext *s, int channels, - uint64_t *channel_layout) -{ - int ch_layout; - - if (channels < 1 || channels > AC3_MAX_CHANNELS) - return AVERROR(EINVAL); - if (*channel_layout > 0x7FF) - return AVERROR(EINVAL); - ch_layout = *channel_layout; - if (!ch_layout) - ch_layout = av_get_default_channel_layout(channels); - - s->lfe_on = !!(ch_layout & AV_CH_LOW_FREQUENCY); - s->channels = channels; - s->fbw_channels = channels - s->lfe_on; - s->lfe_channel = s->lfe_on ? s->fbw_channels + 1 : -1; - if (s->lfe_on) - ch_layout -= AV_CH_LOW_FREQUENCY; - - switch (ch_layout) { - case AV_CH_LAYOUT_MONO: s->channel_mode = AC3_CHMODE_MONO; break; - case AV_CH_LAYOUT_STEREO: s->channel_mode = AC3_CHMODE_STEREO; break; - case AV_CH_LAYOUT_SURROUND: s->channel_mode = AC3_CHMODE_3F; break; - case AV_CH_LAYOUT_2_1: s->channel_mode = AC3_CHMODE_2F1R; break; - case AV_CH_LAYOUT_4POINT0: s->channel_mode = AC3_CHMODE_3F1R; break; - case AV_CH_LAYOUT_QUAD: - case AV_CH_LAYOUT_2_2: s->channel_mode = AC3_CHMODE_2F2R; break; - case AV_CH_LAYOUT_5POINT0: - case AV_CH_LAYOUT_5POINT0_BACK: s->channel_mode = AC3_CHMODE_3F2R; break; - default: - return AVERROR(EINVAL); - } - s->has_center = (s->channel_mode & 0x01) && s->channel_mode != AC3_CHMODE_MONO; - s->has_surround = s->channel_mode & 0x04; - - s->channel_map = ff_ac3_enc_channel_map[s->channel_mode][s->lfe_on]; - *channel_layout = ch_layout; - if (s->lfe_on) - *channel_layout |= AV_CH_LOW_FREQUENCY; - - return 0; -} - - -static av_cold int validate_options(AC3EncodeContext *s) -{ - AVCodecContext *avctx = s->avctx; - int i, ret, max_sr; - - /* validate channel layout */ - if (!avctx->channel_layout) { - av_log(avctx, AV_LOG_WARNING, "No channel layout specified. The " - "encoder will guess the layout, but it " - "might be incorrect.\n"); - } - ret = set_channel_info(s, avctx->channels, &avctx->channel_layout); - if (ret) { - av_log(avctx, AV_LOG_ERROR, "invalid channel layout\n"); - return ret; - } - - /* validate sample rate */ - /* note: max_sr could be changed from 2 to 5 for E-AC-3 once we find a - decoder that supports half sample rate so we can validate that - the generated files are correct. */ - max_sr = s->eac3 ? 2 : 8; - for (i = 0; i <= max_sr; i++) { - if ((ff_ac3_sample_rate_tab[i % 3] >> (i / 3)) == avctx->sample_rate) - break; - } - if (i > max_sr) { - av_log(avctx, AV_LOG_ERROR, "invalid sample rate\n"); - return AVERROR(EINVAL); - } - s->sample_rate = avctx->sample_rate; - s->bit_alloc.sr_shift = i / 3; - s->bit_alloc.sr_code = i % 3; - s->bitstream_id = s->eac3 ? 16 : 8 + s->bit_alloc.sr_shift; - - /* select a default bit rate if not set by the user */ - if (!avctx->bit_rate) { - switch (s->fbw_channels) { - case 1: avctx->bit_rate = 96000; break; - case 2: avctx->bit_rate = 192000; break; - case 3: avctx->bit_rate = 320000; break; - case 4: avctx->bit_rate = 384000; break; - case 5: avctx->bit_rate = 448000; break; - } - } - - /* validate bit rate */ - if (s->eac3) { - int max_br, min_br, wpf, min_br_dist, min_br_code; - int num_blks_code, num_blocks, frame_samples; - - /* calculate min/max bitrate */ - /* TODO: More testing with 3 and 2 blocks. All E-AC-3 samples I've - found use either 6 blocks or 1 block, even though 2 or 3 blocks - would work as far as the bit rate is concerned. */ - for (num_blks_code = 3; num_blks_code >= 0; num_blks_code--) { - num_blocks = ((int[]){ 1, 2, 3, 6 })[num_blks_code]; - frame_samples = AC3_BLOCK_SIZE * num_blocks; - max_br = 2048 * s->sample_rate / frame_samples * 16; - min_br = ((s->sample_rate + (frame_samples-1)) / frame_samples) * 16; - if (avctx->bit_rate <= max_br) - break; - } - if (avctx->bit_rate < min_br || avctx->bit_rate > max_br) { - av_log(avctx, AV_LOG_ERROR, "invalid bit rate. must be %d to %d " - "for this sample rate\n", min_br, max_br); - return AVERROR(EINVAL); - } - s->num_blks_code = num_blks_code; - s->num_blocks = num_blocks; - - /* calculate words-per-frame for the selected bitrate */ - wpf = (avctx->bit_rate / 16) * frame_samples / s->sample_rate; - av_assert1(wpf > 0 && wpf <= 2048); - - /* find the closest AC-3 bitrate code to the selected bitrate. - this is needed for lookup tables for bandwidth and coupling - parameter selection */ - min_br_code = -1; - min_br_dist = INT_MAX; - for (i = 0; i < 19; i++) { - int br_dist = abs(ff_ac3_bitrate_tab[i] * 1000 - avctx->bit_rate); - if (br_dist < min_br_dist) { - min_br_dist = br_dist; - min_br_code = i; - } - } - - /* make sure the minimum frame size is below the average frame size */ - s->frame_size_code = min_br_code << 1; - while (wpf > 1 && wpf * s->sample_rate / AC3_FRAME_SIZE * 16 > avctx->bit_rate) - wpf--; - s->frame_size_min = 2 * wpf; - } else { - int best_br = 0, best_code = 0, best_diff = INT_MAX; - for (i = 0; i < 19; i++) { - int br = (ff_ac3_bitrate_tab[i] >> s->bit_alloc.sr_shift) * 1000; - int diff = abs(br - avctx->bit_rate); - if (diff < best_diff) { - best_br = br; - best_code = i; - best_diff = diff; - } - if (!best_diff) - break; - } - avctx->bit_rate = best_br; - s->frame_size_code = best_code << 1; - s->frame_size_min = 2 * ff_ac3_frame_size_tab[s->frame_size_code][s->bit_alloc.sr_code]; - s->num_blks_code = 0x3; - s->num_blocks = 6; - } - s->bit_rate = avctx->bit_rate; - s->frame_size = s->frame_size_min; - - /* validate cutoff */ - if (avctx->cutoff < 0) { - av_log(avctx, AV_LOG_ERROR, "invalid cutoff frequency\n"); - return AVERROR(EINVAL); - } - s->cutoff = avctx->cutoff; - if (s->cutoff > (s->sample_rate >> 1)) - s->cutoff = s->sample_rate >> 1; - - ret = ff_ac3_validate_metadata(s); - if (ret) - return ret; - - s->rematrixing_enabled = s->options.stereo_rematrixing && - (s->channel_mode == AC3_CHMODE_STEREO); - - s->cpl_enabled = s->options.channel_coupling && - s->channel_mode >= AC3_CHMODE_STEREO; - - return 0; -} - - -/* - * Set bandwidth for all channels. - * The user can optionally supply a cutoff frequency. Otherwise an appropriate - * default value will be used. - */ -static av_cold void set_bandwidth(AC3EncodeContext *s) -{ - int blk, ch, cpl_start; - - if (s->cutoff) { - /* calculate bandwidth based on user-specified cutoff frequency */ - int fbw_coeffs; - fbw_coeffs = s->cutoff * 2 * AC3_MAX_COEFS / s->sample_rate; - s->bandwidth_code = av_clip((fbw_coeffs - 73) / 3, 0, 60); - } else { - /* use default bandwidth setting */ - s->bandwidth_code = ac3_bandwidth_tab[s->fbw_channels-1][s->bit_alloc.sr_code][s->frame_size_code/2]; - } - - /* set number of coefficients for each channel */ - for (ch = 1; ch <= s->fbw_channels; ch++) { - s->start_freq[ch] = 0; - for (blk = 0; blk < s->num_blocks; blk++) - s->blocks[blk].end_freq[ch] = s->bandwidth_code * 3 + 73; - } - /* LFE channel always has 7 coefs */ - if (s->lfe_on) { - s->start_freq[s->lfe_channel] = 0; - for (blk = 0; blk < s->num_blocks; blk++) - s->blocks[blk].end_freq[ch] = 7; - } - - /* initialize coupling strategy */ - if (s->cpl_enabled) { - if (s->options.cpl_start != AC3ENC_OPT_AUTO) { - cpl_start = s->options.cpl_start; - } else { - cpl_start = ac3_coupling_start_tab[s->channel_mode-2][s->bit_alloc.sr_code][s->frame_size_code/2]; - if (cpl_start < 0) { - if (s->options.channel_coupling == AC3ENC_OPT_AUTO) - s->cpl_enabled = 0; - else - cpl_start = 15; - } - } - } - if (s->cpl_enabled) { - int i, cpl_start_band, cpl_end_band; - uint8_t *cpl_band_sizes = s->cpl_band_sizes; - - cpl_end_band = s->bandwidth_code / 4 + 3; - cpl_start_band = av_clip(cpl_start, 0, FFMIN(cpl_end_band-1, 15)); - - s->num_cpl_subbands = cpl_end_band - cpl_start_band; - - s->num_cpl_bands = 1; - *cpl_band_sizes = 12; - for (i = cpl_start_band + 1; i < cpl_end_band; i++) { - if (ff_eac3_default_cpl_band_struct[i]) { - *cpl_band_sizes += 12; - } else { - s->num_cpl_bands++; - cpl_band_sizes++; - *cpl_band_sizes = 12; - } - } - - s->start_freq[CPL_CH] = cpl_start_band * 12 + 37; - s->cpl_end_freq = cpl_end_band * 12 + 37; - for (blk = 0; blk < s->num_blocks; blk++) - s->blocks[blk].end_freq[CPL_CH] = s->cpl_end_freq; - } -} - - -static av_cold int allocate_buffers(AC3EncodeContext *s) -{ - AVCodecContext *avctx = s->avctx; - int blk, ch; - int channels = s->channels + 1; /* includes coupling channel */ - int channel_blocks = channels * s->num_blocks; - int total_coefs = AC3_MAX_COEFS * channel_blocks; - - if (s->allocate_sample_buffers(s)) - goto alloc_fail; - - FF_ALLOC_OR_GOTO(avctx, s->bap_buffer, total_coefs * - sizeof(*s->bap_buffer), alloc_fail); - FF_ALLOC_OR_GOTO(avctx, s->bap1_buffer, total_coefs * - sizeof(*s->bap1_buffer), alloc_fail); - FF_ALLOCZ_OR_GOTO(avctx, s->mdct_coef_buffer, total_coefs * - sizeof(*s->mdct_coef_buffer), alloc_fail); - FF_ALLOC_OR_GOTO(avctx, s->exp_buffer, total_coefs * - sizeof(*s->exp_buffer), alloc_fail); - FF_ALLOC_OR_GOTO(avctx, s->grouped_exp_buffer, channel_blocks * 128 * - sizeof(*s->grouped_exp_buffer), alloc_fail); - FF_ALLOC_OR_GOTO(avctx, s->psd_buffer, total_coefs * - sizeof(*s->psd_buffer), alloc_fail); - FF_ALLOC_OR_GOTO(avctx, s->band_psd_buffer, channel_blocks * 64 * - sizeof(*s->band_psd_buffer), alloc_fail); - FF_ALLOC_OR_GOTO(avctx, s->mask_buffer, channel_blocks * 64 * - sizeof(*s->mask_buffer), alloc_fail); - FF_ALLOC_OR_GOTO(avctx, s->qmant_buffer, total_coefs * - sizeof(*s->qmant_buffer), alloc_fail); - if (s->cpl_enabled) { - FF_ALLOC_OR_GOTO(avctx, s->cpl_coord_exp_buffer, channel_blocks * 16 * - sizeof(*s->cpl_coord_exp_buffer), alloc_fail); - FF_ALLOC_OR_GOTO(avctx, s->cpl_coord_mant_buffer, channel_blocks * 16 * - sizeof(*s->cpl_coord_mant_buffer), alloc_fail); - } - for (blk = 0; blk < s->num_blocks; blk++) { - AC3Block *block = &s->blocks[blk]; - FF_ALLOCZ_OR_GOTO(avctx, block->mdct_coef, channels * sizeof(*block->mdct_coef), - alloc_fail); - FF_ALLOCZ_OR_GOTO(avctx, block->exp, channels * sizeof(*block->exp), - alloc_fail); - FF_ALLOCZ_OR_GOTO(avctx, block->grouped_exp, channels * sizeof(*block->grouped_exp), - alloc_fail); - FF_ALLOCZ_OR_GOTO(avctx, block->psd, channels * sizeof(*block->psd), - alloc_fail); - FF_ALLOCZ_OR_GOTO(avctx, block->band_psd, channels * sizeof(*block->band_psd), - alloc_fail); - FF_ALLOCZ_OR_GOTO(avctx, block->mask, channels * sizeof(*block->mask), - alloc_fail); - FF_ALLOCZ_OR_GOTO(avctx, block->qmant, channels * sizeof(*block->qmant), - alloc_fail); - if (s->cpl_enabled) { - FF_ALLOCZ_OR_GOTO(avctx, block->cpl_coord_exp, channels * sizeof(*block->cpl_coord_exp), - alloc_fail); - FF_ALLOCZ_OR_GOTO(avctx, block->cpl_coord_mant, channels * sizeof(*block->cpl_coord_mant), - alloc_fail); - } - - for (ch = 0; ch < channels; ch++) { - /* arrangement: block, channel, coeff */ - block->grouped_exp[ch] = &s->grouped_exp_buffer[128 * (blk * channels + ch)]; - block->psd[ch] = &s->psd_buffer [AC3_MAX_COEFS * (blk * channels + ch)]; - block->band_psd[ch] = &s->band_psd_buffer [64 * (blk * channels + ch)]; - block->mask[ch] = &s->mask_buffer [64 * (blk * channels + ch)]; - block->qmant[ch] = &s->qmant_buffer [AC3_MAX_COEFS * (blk * channels + ch)]; - if (s->cpl_enabled) { - block->cpl_coord_exp[ch] = &s->cpl_coord_exp_buffer [16 * (blk * channels + ch)]; - block->cpl_coord_mant[ch] = &s->cpl_coord_mant_buffer[16 * (blk * channels + ch)]; - } - - /* arrangement: channel, block, coeff */ - block->exp[ch] = &s->exp_buffer [AC3_MAX_COEFS * (s->num_blocks * ch + blk)]; - block->mdct_coef[ch] = &s->mdct_coef_buffer [AC3_MAX_COEFS * (s->num_blocks * ch + blk)]; - } - } - - if (!s->fixed_point) { - FF_ALLOCZ_OR_GOTO(avctx, s->fixed_coef_buffer, total_coefs * - sizeof(*s->fixed_coef_buffer), alloc_fail); - for (blk = 0; blk < s->num_blocks; blk++) { - AC3Block *block = &s->blocks[blk]; - FF_ALLOCZ_OR_GOTO(avctx, block->fixed_coef, channels * - sizeof(*block->fixed_coef), alloc_fail); - for (ch = 0; ch < channels; ch++) - block->fixed_coef[ch] = &s->fixed_coef_buffer[AC3_MAX_COEFS * (s->num_blocks * ch + blk)]; - } - } else { - for (blk = 0; blk < s->num_blocks; blk++) { - AC3Block *block = &s->blocks[blk]; - FF_ALLOCZ_OR_GOTO(avctx, block->fixed_coef, channels * - sizeof(*block->fixed_coef), alloc_fail); - for (ch = 0; ch < channels; ch++) - block->fixed_coef[ch] = (int32_t *)block->mdct_coef[ch]; - } - } - - return 0; -alloc_fail: - return AVERROR(ENOMEM); -} - - -av_cold int ff_ac3_encode_init(AVCodecContext *avctx) -{ - AC3EncodeContext *s = avctx->priv_data; - int ret, frame_size_58; - - s->avctx = avctx; - - s->eac3 = avctx->codec_id == AV_CODEC_ID_EAC3; - - ff_ac3_common_init(); - - ret = validate_options(s); - if (ret) - return ret; - - avctx->frame_size = AC3_BLOCK_SIZE * s->num_blocks; - avctx->delay = AC3_BLOCK_SIZE; - - s->bitstream_mode = avctx->audio_service_type; - if (s->bitstream_mode == AV_AUDIO_SERVICE_TYPE_KARAOKE) - s->bitstream_mode = 0x7; - - s->bits_written = 0; - s->samples_written = 0; - - /* calculate crc_inv for both possible frame sizes */ - frame_size_58 = (( s->frame_size >> 2) + ( s->frame_size >> 4)) << 1; - s->crc_inv[0] = pow_poly((CRC16_POLY >> 1), (8 * frame_size_58) - 16, CRC16_POLY); - if (s->bit_alloc.sr_code == 1) { - frame_size_58 = (((s->frame_size+2) >> 2) + ((s->frame_size+2) >> 4)) << 1; - s->crc_inv[1] = pow_poly((CRC16_POLY >> 1), (8 * frame_size_58) - 16, CRC16_POLY); - } - - /* set function pointers */ - if (CONFIG_AC3_FIXED_ENCODER && s->fixed_point) { - s->mdct_end = ff_ac3_fixed_mdct_end; - s->mdct_init = ff_ac3_fixed_mdct_init; - s->allocate_sample_buffers = ff_ac3_fixed_allocate_sample_buffers; - } else if (CONFIG_AC3_ENCODER || CONFIG_EAC3_ENCODER) { - s->mdct_end = ff_ac3_float_mdct_end; - s->mdct_init = ff_ac3_float_mdct_init; - s->allocate_sample_buffers = ff_ac3_float_allocate_sample_buffers; - } - if (CONFIG_EAC3_ENCODER && s->eac3) - s->output_frame_header = ff_eac3_output_frame_header; - else - s->output_frame_header = ac3_output_frame_header; - - set_bandwidth(s); - - exponent_init(s); - - bit_alloc_init(s); - - ret = s->mdct_init(s); - if (ret) - goto init_fail; - - ret = allocate_buffers(s); - if (ret) - goto init_fail; - - ff_dsputil_init(&s->dsp, avctx); - avpriv_float_dsp_init(&s->fdsp, avctx->flags & CODEC_FLAG_BITEXACT); - ff_ac3dsp_init(&s->ac3dsp, avctx->flags & CODEC_FLAG_BITEXACT); - - dprint_options(s); - - return 0; -init_fail: - ff_ac3_encode_close(avctx); - return ret; -} |