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