diff options
Diffstat (limited to 'ffmpeg/libavcodec/ac3enc_template.c')
| -rw-r--r-- | ffmpeg/libavcodec/ac3enc_template.c | 443 |
1 files changed, 0 insertions, 443 deletions
diff --git a/ffmpeg/libavcodec/ac3enc_template.c b/ffmpeg/libavcodec/ac3enc_template.c deleted file mode 100644 index 4689f70..0000000 --- a/ffmpeg/libavcodec/ac3enc_template.c +++ /dev/null @@ -1,443 +0,0 @@ -/* - * AC-3 encoder float/fixed template - * Copyright (c) 2000 Fabrice Bellard - * Copyright (c) 2006-2011 Justin Ruggles <justin.ruggles@gmail.com> - * Copyright (c) 2006-2010 Prakash Punnoor <prakash@punnoor.de> - * - * This file is part of FFmpeg. - * - * FFmpeg is free software; you can redistribute it and/or - * modify it under the terms of the GNU Lesser General Public - * License as published by the Free Software Foundation; either - * version 2.1 of the License, or (at your option) any later version. - * - * FFmpeg is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * Lesser General Public License for more details. - * - * You should have received a copy of the GNU Lesser General Public - * License along with FFmpeg; if not, write to the Free Software - * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA - */ - -/** - * @file - * AC-3 encoder float/fixed template - */ - -#include <stdint.h> - -#include "libavutil/internal.h" - -/* prototypes for static functions in ac3enc_fixed.c and ac3enc_float.c */ - -static void scale_coefficients(AC3EncodeContext *s); - -static int normalize_samples(AC3EncodeContext *s); - -static void clip_coefficients(DSPContext *dsp, CoefType *coef, unsigned int len); - -static CoefType calc_cpl_coord(CoefSumType energy_ch, CoefSumType energy_cpl); - -static void sum_square_butterfly(AC3EncodeContext *s, CoefSumType sum[4], - const CoefType *coef0, const CoefType *coef1, - int len); - -int AC3_NAME(allocate_sample_buffers)(AC3EncodeContext *s) -{ - int ch; - - FF_ALLOC_OR_GOTO(s->avctx, s->windowed_samples, AC3_WINDOW_SIZE * - sizeof(*s->windowed_samples), alloc_fail); - FF_ALLOC_OR_GOTO(s->avctx, s->planar_samples, s->channels * sizeof(*s->planar_samples), - alloc_fail); - for (ch = 0; ch < s->channels; ch++) { - FF_ALLOCZ_OR_GOTO(s->avctx, s->planar_samples[ch], - (AC3_FRAME_SIZE+AC3_BLOCK_SIZE) * sizeof(**s->planar_samples), - alloc_fail); - } - - return 0; -alloc_fail: - return AVERROR(ENOMEM); -} - - -/* - * Copy input samples. - * Channels are reordered from FFmpeg's default order to AC-3 order. - */ -static void copy_input_samples(AC3EncodeContext *s, SampleType **samples) -{ - int ch; - - /* copy and remap input samples */ - for (ch = 0; ch < s->channels; ch++) { - /* copy last 256 samples of previous frame to the start of the current frame */ - memcpy(&s->planar_samples[ch][0], &s->planar_samples[ch][AC3_BLOCK_SIZE * s->num_blocks], - AC3_BLOCK_SIZE * sizeof(s->planar_samples[0][0])); - - /* copy new samples for current frame */ - memcpy(&s->planar_samples[ch][AC3_BLOCK_SIZE], - samples[s->channel_map[ch]], - AC3_BLOCK_SIZE * s->num_blocks * sizeof(s->planar_samples[0][0])); - } -} - - -/* - * Apply the MDCT to input samples to generate frequency coefficients. - * This applies the KBD window and normalizes the input to reduce precision - * loss due to fixed-point calculations. - */ -static void apply_mdct(AC3EncodeContext *s) -{ - int blk, ch; - - for (ch = 0; ch < s->channels; ch++) { - for (blk = 0; blk < s->num_blocks; blk++) { - AC3Block *block = &s->blocks[blk]; - const SampleType *input_samples = &s->planar_samples[ch][blk * AC3_BLOCK_SIZE]; - -#if CONFIG_AC3ENC_FLOAT - s->fdsp.vector_fmul(s->windowed_samples, input_samples, - s->mdct_window, AC3_WINDOW_SIZE); -#else - s->ac3dsp.apply_window_int16(s->windowed_samples, input_samples, - s->mdct_window, AC3_WINDOW_SIZE); -#endif - - if (s->fixed_point) - block->coeff_shift[ch+1] = normalize_samples(s); - - s->mdct.mdct_calcw(&s->mdct, block->mdct_coef[ch+1], - s->windowed_samples); - } - } -} - - -/* - * Calculate coupling channel and coupling coordinates. - */ -static void apply_channel_coupling(AC3EncodeContext *s) -{ - LOCAL_ALIGNED_16(CoefType, cpl_coords, [AC3_MAX_BLOCKS], [AC3_MAX_CHANNELS][16]); -#if CONFIG_AC3ENC_FLOAT - LOCAL_ALIGNED_16(int32_t, fixed_cpl_coords, [AC3_MAX_BLOCKS], [AC3_MAX_CHANNELS][16]); -#else - int32_t (*fixed_cpl_coords)[AC3_MAX_CHANNELS][16] = cpl_coords; -#endif - int av_uninit(blk), ch, bnd, i, j; - CoefSumType energy[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS][16] = {{{0}}}; - int cpl_start, num_cpl_coefs; - - memset(cpl_coords, 0, AC3_MAX_BLOCKS * sizeof(*cpl_coords)); -#if CONFIG_AC3ENC_FLOAT - memset(fixed_cpl_coords, 0, AC3_MAX_BLOCKS * sizeof(*cpl_coords)); -#endif - - /* align start to 16-byte boundary. align length to multiple of 32. - note: coupling start bin % 4 will always be 1 */ - cpl_start = s->start_freq[CPL_CH] - 1; - num_cpl_coefs = FFALIGN(s->num_cpl_subbands * 12 + 1, 32); - cpl_start = FFMIN(256, cpl_start + num_cpl_coefs) - num_cpl_coefs; - - /* calculate coupling channel from fbw channels */ - for (blk = 0; blk < s->num_blocks; blk++) { - AC3Block *block = &s->blocks[blk]; - CoefType *cpl_coef = &block->mdct_coef[CPL_CH][cpl_start]; - if (!block->cpl_in_use) - continue; - memset(cpl_coef, 0, num_cpl_coefs * sizeof(*cpl_coef)); - for (ch = 1; ch <= s->fbw_channels; ch++) { - CoefType *ch_coef = &block->mdct_coef[ch][cpl_start]; - if (!block->channel_in_cpl[ch]) - continue; - for (i = 0; i < num_cpl_coefs; i++) - cpl_coef[i] += ch_coef[i]; - } - - /* coefficients must be clipped in order to be encoded */ - clip_coefficients(&s->dsp, cpl_coef, num_cpl_coefs); - } - - /* calculate energy in each band in coupling channel and each fbw channel */ - /* TODO: possibly use SIMD to speed up energy calculation */ - bnd = 0; - i = s->start_freq[CPL_CH]; - while (i < s->cpl_end_freq) { - int band_size = s->cpl_band_sizes[bnd]; - for (ch = CPL_CH; ch <= s->fbw_channels; ch++) { - for (blk = 0; blk < s->num_blocks; blk++) { - AC3Block *block = &s->blocks[blk]; - if (!block->cpl_in_use || (ch > CPL_CH && !block->channel_in_cpl[ch])) - continue; - for (j = 0; j < band_size; j++) { - CoefType v = block->mdct_coef[ch][i+j]; - MAC_COEF(energy[blk][ch][bnd], v, v); - } - } - } - i += band_size; - bnd++; - } - - /* calculate coupling coordinates for all blocks for all channels */ - for (blk = 0; blk < s->num_blocks; blk++) { - AC3Block *block = &s->blocks[blk]; - if (!block->cpl_in_use) - continue; - for (ch = 1; ch <= s->fbw_channels; ch++) { - if (!block->channel_in_cpl[ch]) - continue; - for (bnd = 0; bnd < s->num_cpl_bands; bnd++) { - cpl_coords[blk][ch][bnd] = calc_cpl_coord(energy[blk][ch][bnd], - energy[blk][CPL_CH][bnd]); - } - } - } - - /* determine which blocks to send new coupling coordinates for */ - for (blk = 0; blk < s->num_blocks; blk++) { - AC3Block *block = &s->blocks[blk]; - AC3Block *block0 = blk ? &s->blocks[blk-1] : NULL; - - memset(block->new_cpl_coords, 0, sizeof(block->new_cpl_coords)); - - if (block->cpl_in_use) { - /* send new coordinates if this is the first block, if previous - * block did not use coupling but this block does, the channels - * using coupling has changed from the previous block, or the - * coordinate difference from the last block for any channel is - * greater than a threshold value. */ - if (blk == 0 || !block0->cpl_in_use) { - for (ch = 1; ch <= s->fbw_channels; ch++) - block->new_cpl_coords[ch] = 1; - } else { - for (ch = 1; ch <= s->fbw_channels; ch++) { - if (!block->channel_in_cpl[ch]) - continue; - if (!block0->channel_in_cpl[ch]) { - block->new_cpl_coords[ch] = 1; - } else { - CoefSumType coord_diff = 0; - for (bnd = 0; bnd < s->num_cpl_bands; bnd++) { - coord_diff += FFABS(cpl_coords[blk-1][ch][bnd] - - cpl_coords[blk ][ch][bnd]); - } - coord_diff /= s->num_cpl_bands; - if (coord_diff > NEW_CPL_COORD_THRESHOLD) - block->new_cpl_coords[ch] = 1; - } - } - } - } - } - - /* calculate final coupling coordinates, taking into account reusing of - coordinates in successive blocks */ - for (bnd = 0; bnd < s->num_cpl_bands; bnd++) { - blk = 0; - while (blk < s->num_blocks) { - int av_uninit(blk1); - AC3Block *block = &s->blocks[blk]; - - if (!block->cpl_in_use) { - blk++; - continue; - } - - for (ch = 1; ch <= s->fbw_channels; ch++) { - CoefSumType energy_ch, energy_cpl; - if (!block->channel_in_cpl[ch]) - continue; - energy_cpl = energy[blk][CPL_CH][bnd]; - energy_ch = energy[blk][ch][bnd]; - blk1 = blk+1; - while (!s->blocks[blk1].new_cpl_coords[ch] && blk1 < s->num_blocks) { - if (s->blocks[blk1].cpl_in_use) { - energy_cpl += energy[blk1][CPL_CH][bnd]; - energy_ch += energy[blk1][ch][bnd]; - } - blk1++; - } - cpl_coords[blk][ch][bnd] = calc_cpl_coord(energy_ch, energy_cpl); - } - blk = blk1; - } - } - - /* calculate exponents/mantissas for coupling coordinates */ - for (blk = 0; blk < s->num_blocks; blk++) { - AC3Block *block = &s->blocks[blk]; - if (!block->cpl_in_use) - continue; - -#if CONFIG_AC3ENC_FLOAT - s->ac3dsp.float_to_fixed24(fixed_cpl_coords[blk][1], - cpl_coords[blk][1], - s->fbw_channels * 16); -#endif - s->ac3dsp.extract_exponents(block->cpl_coord_exp[1], - fixed_cpl_coords[blk][1], - s->fbw_channels * 16); - - for (ch = 1; ch <= s->fbw_channels; ch++) { - int bnd, min_exp, max_exp, master_exp; - - if (!block->new_cpl_coords[ch]) - continue; - - /* determine master exponent */ - min_exp = max_exp = block->cpl_coord_exp[ch][0]; - for (bnd = 1; bnd < s->num_cpl_bands; bnd++) { - int exp = block->cpl_coord_exp[ch][bnd]; - min_exp = FFMIN(exp, min_exp); - max_exp = FFMAX(exp, max_exp); - } - master_exp = ((max_exp - 15) + 2) / 3; - master_exp = FFMAX(master_exp, 0); - while (min_exp < master_exp * 3) - master_exp--; - for (bnd = 0; bnd < s->num_cpl_bands; bnd++) { - block->cpl_coord_exp[ch][bnd] = av_clip(block->cpl_coord_exp[ch][bnd] - - master_exp * 3, 0, 15); - } - block->cpl_master_exp[ch] = master_exp; - - /* quantize mantissas */ - for (bnd = 0; bnd < s->num_cpl_bands; bnd++) { - int cpl_exp = block->cpl_coord_exp[ch][bnd]; - int cpl_mant = (fixed_cpl_coords[blk][ch][bnd] << (5 + cpl_exp + master_exp * 3)) >> 24; - if (cpl_exp == 15) - cpl_mant >>= 1; - else - cpl_mant -= 16; - - block->cpl_coord_mant[ch][bnd] = cpl_mant; - } - } - } - - if (CONFIG_EAC3_ENCODER && s->eac3) - ff_eac3_set_cpl_states(s); -} - - -/* - * Determine rematrixing flags for each block and band. - */ -static void compute_rematrixing_strategy(AC3EncodeContext *s) -{ - int nb_coefs; - int blk, bnd; - AC3Block *block, *block0 = NULL; - - if (s->channel_mode != AC3_CHMODE_STEREO) - return; - - for (blk = 0; blk < s->num_blocks; blk++) { - block = &s->blocks[blk]; - block->new_rematrixing_strategy = !blk; - - block->num_rematrixing_bands = 4; - if (block->cpl_in_use) { - block->num_rematrixing_bands -= (s->start_freq[CPL_CH] <= 61); - block->num_rematrixing_bands -= (s->start_freq[CPL_CH] == 37); - if (blk && block->num_rematrixing_bands != block0->num_rematrixing_bands) - block->new_rematrixing_strategy = 1; - } - nb_coefs = FFMIN(block->end_freq[1], block->end_freq[2]); - - if (!s->rematrixing_enabled) { - block0 = block; - continue; - } - - for (bnd = 0; bnd < block->num_rematrixing_bands; bnd++) { - /* calculate sum of squared coeffs for one band in one block */ - int start = ff_ac3_rematrix_band_tab[bnd]; - int end = FFMIN(nb_coefs, ff_ac3_rematrix_band_tab[bnd+1]); - CoefSumType sum[4]; - sum_square_butterfly(s, sum, block->mdct_coef[1] + start, - block->mdct_coef[2] + start, end - start); - - /* compare sums to determine if rematrixing will be used for this band */ - if (FFMIN(sum[2], sum[3]) < FFMIN(sum[0], sum[1])) - block->rematrixing_flags[bnd] = 1; - else - block->rematrixing_flags[bnd] = 0; - - /* determine if new rematrixing flags will be sent */ - if (blk && - block->rematrixing_flags[bnd] != block0->rematrixing_flags[bnd]) { - block->new_rematrixing_strategy = 1; - } - } - block0 = block; - } -} - - -int AC3_NAME(encode_frame)(AVCodecContext *avctx, AVPacket *avpkt, - const AVFrame *frame, int *got_packet_ptr) -{ - AC3EncodeContext *s = avctx->priv_data; - int ret; - - if (s->options.allow_per_frame_metadata) { - ret = ff_ac3_validate_metadata(s); - if (ret) - return ret; - } - - if (s->bit_alloc.sr_code == 1 || s->eac3) - ff_ac3_adjust_frame_size(s); - - copy_input_samples(s, (SampleType **)frame->extended_data); - - apply_mdct(s); - - if (s->fixed_point) - scale_coefficients(s); - - clip_coefficients(&s->dsp, s->blocks[0].mdct_coef[1], - AC3_MAX_COEFS * s->num_blocks * s->channels); - - s->cpl_on = s->cpl_enabled; - ff_ac3_compute_coupling_strategy(s); - - if (s->cpl_on) - apply_channel_coupling(s); - - compute_rematrixing_strategy(s); - - if (!s->fixed_point) - scale_coefficients(s); - - ff_ac3_apply_rematrixing(s); - - ff_ac3_process_exponents(s); - - ret = ff_ac3_compute_bit_allocation(s); - if (ret) { - av_log(avctx, AV_LOG_ERROR, "Bit allocation failed. Try increasing the bitrate.\n"); - return ret; - } - - ff_ac3_group_exponents(s); - - ff_ac3_quantize_mantissas(s); - - if ((ret = ff_alloc_packet2(avctx, avpkt, s->frame_size)) < 0) - return ret; - ff_ac3_output_frame(s, avpkt->data); - - if (frame->pts != AV_NOPTS_VALUE) - avpkt->pts = frame->pts - ff_samples_to_time_base(avctx, avctx->delay); - - *got_packet_ptr = 1; - return 0; -} |