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4243da4ff4
This is possible, because every given FFCodec has to implement exactly one of these. Doing so decreases sizeof(FFCodec) and therefore decreases the size of the binary. Notice that in case of position-independent code the decrease is in .data.rel.ro, so that this translates to decreased memory consumption. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
275 lines
10 KiB
C
275 lines
10 KiB
C
/*
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* E-AC-3 encoder
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* Copyright (c) 2011 Justin Ruggles <justin.ruggles@gmail.com>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* E-AC-3 encoder
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*/
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#define AC3ENC_FLOAT 1
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#include "libavutil/attributes.h"
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#include "ac3enc.h"
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#include "codec_internal.h"
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#include "eac3enc.h"
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#include "eac3_data.h"
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static const AVClass eac3enc_class = {
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.class_name = "E-AC-3 Encoder",
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.item_name = av_default_item_name,
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.option = &ff_ac3_enc_options[2], /* First two options are AC-3 only. */
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.version = LIBAVUTIL_VERSION_INT,
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};
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/**
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* LUT for finding a matching frame exponent strategy index from a set of
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* exponent strategies for a single channel across all 6 blocks.
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*/
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static int8_t eac3_frame_expstr_index_tab[3][4][4][4][4][4];
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av_cold void ff_eac3_exponent_init(void)
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{
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int i;
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memset(eac3_frame_expstr_index_tab, -1, sizeof(eac3_frame_expstr_index_tab));
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for (i = 0; i < 32; i++) {
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eac3_frame_expstr_index_tab[ff_eac3_frm_expstr[i][0]-1]
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[ff_eac3_frm_expstr[i][1]]
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[ff_eac3_frm_expstr[i][2]]
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[ff_eac3_frm_expstr[i][3]]
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[ff_eac3_frm_expstr[i][4]]
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[ff_eac3_frm_expstr[i][5]] = i;
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}
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}
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void ff_eac3_get_frame_exp_strategy(AC3EncodeContext *s)
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{
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int ch;
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if (s->num_blocks < 6) {
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s->use_frame_exp_strategy = 0;
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return;
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}
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s->use_frame_exp_strategy = 1;
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for (ch = !s->cpl_on; ch <= s->fbw_channels; ch++) {
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int expstr = eac3_frame_expstr_index_tab[s->exp_strategy[ch][0]-1]
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[s->exp_strategy[ch][1]]
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[s->exp_strategy[ch][2]]
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[s->exp_strategy[ch][3]]
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[s->exp_strategy[ch][4]]
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[s->exp_strategy[ch][5]];
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if (expstr < 0) {
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s->use_frame_exp_strategy = 0;
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break;
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}
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s->frame_exp_strategy[ch] = expstr;
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}
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}
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void ff_eac3_set_cpl_states(AC3EncodeContext *s)
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{
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int ch, blk;
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int first_cpl_coords[AC3_MAX_CHANNELS];
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/* set first cpl coords */
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for (ch = 1; ch <= s->fbw_channels; ch++)
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first_cpl_coords[ch] = 1;
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for (blk = 0; blk < s->num_blocks; blk++) {
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AC3Block *block = &s->blocks[blk];
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for (ch = 1; ch <= s->fbw_channels; ch++) {
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if (block->channel_in_cpl[ch]) {
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if (first_cpl_coords[ch]) {
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block->new_cpl_coords[ch] = 2;
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first_cpl_coords[ch] = 0;
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}
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} else {
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first_cpl_coords[ch] = 1;
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}
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}
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}
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/* set first cpl leak */
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for (blk = 0; blk < s->num_blocks; blk++) {
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AC3Block *block = &s->blocks[blk];
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if (block->cpl_in_use) {
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block->new_cpl_leak = 2;
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break;
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}
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}
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}
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void ff_eac3_output_frame_header(AC3EncodeContext *s)
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{
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int blk, ch;
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AC3EncOptions *opt = &s->options;
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put_bits(&s->pb, 16, 0x0b77); /* sync word */
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/* BSI header */
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put_bits(&s->pb, 2, 0); /* stream type = independent */
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put_bits(&s->pb, 3, 0); /* substream id = 0 */
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put_bits(&s->pb, 11, (s->frame_size / 2) - 1); /* frame size */
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if (s->bit_alloc.sr_shift) {
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put_bits(&s->pb, 2, 0x3); /* fscod2 */
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put_bits(&s->pb, 2, s->bit_alloc.sr_code); /* sample rate code */
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} else {
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put_bits(&s->pb, 2, s->bit_alloc.sr_code); /* sample rate code */
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put_bits(&s->pb, 2, s->num_blks_code); /* number of blocks */
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}
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put_bits(&s->pb, 3, s->channel_mode); /* audio coding mode */
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put_bits(&s->pb, 1, s->lfe_on); /* LFE channel indicator */
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put_bits(&s->pb, 5, s->bitstream_id); /* bitstream id (EAC3=16) */
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put_bits(&s->pb, 5, -opt->dialogue_level); /* dialogue normalization level */
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put_bits(&s->pb, 1, 0); /* no compression gain */
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/* mixing metadata*/
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put_bits(&s->pb, 1, opt->eac3_mixing_metadata);
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if (opt->eac3_mixing_metadata) {
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if (s->channel_mode > AC3_CHMODE_STEREO)
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put_bits(&s->pb, 2, opt->preferred_stereo_downmix);
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if (s->has_center) {
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put_bits(&s->pb, 3, s->ltrt_center_mix_level);
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put_bits(&s->pb, 3, s->loro_center_mix_level);
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}
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if (s->has_surround) {
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put_bits(&s->pb, 3, s->ltrt_surround_mix_level);
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put_bits(&s->pb, 3, s->loro_surround_mix_level);
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}
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if (s->lfe_on)
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put_bits(&s->pb, 1, 0);
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put_bits(&s->pb, 1, 0); /* no program scale */
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put_bits(&s->pb, 1, 0); /* no ext program scale */
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put_bits(&s->pb, 2, 0); /* no mixing parameters */
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if (s->channel_mode < AC3_CHMODE_STEREO)
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put_bits(&s->pb, 1, 0); /* no pan info */
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put_bits(&s->pb, 1, 0); /* no frame mix config info */
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}
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/* info metadata*/
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put_bits(&s->pb, 1, opt->eac3_info_metadata);
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if (opt->eac3_info_metadata) {
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put_bits(&s->pb, 3, s->bitstream_mode);
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put_bits(&s->pb, 1, opt->copyright);
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put_bits(&s->pb, 1, opt->original);
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if (s->channel_mode == AC3_CHMODE_STEREO) {
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put_bits(&s->pb, 2, opt->dolby_surround_mode);
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put_bits(&s->pb, 2, opt->dolby_headphone_mode);
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}
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if (s->channel_mode >= AC3_CHMODE_2F2R)
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put_bits(&s->pb, 2, opt->dolby_surround_ex_mode);
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put_bits(&s->pb, 1, opt->audio_production_info);
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if (opt->audio_production_info) {
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put_bits(&s->pb, 5, opt->mixing_level - 80);
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put_bits(&s->pb, 2, opt->room_type);
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put_bits(&s->pb, 1, opt->ad_converter_type);
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}
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put_bits(&s->pb, 1, 0);
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}
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if (s->num_blocks != 6)
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put_bits(&s->pb, 1, !(s->avctx->frame_number % 6)); /* converter sync flag */
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put_bits(&s->pb, 1, 0); /* no additional bit stream info */
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/* frame header */
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if (s->num_blocks == 6) {
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put_bits(&s->pb, 1, !s->use_frame_exp_strategy); /* exponent strategy syntax */
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put_bits(&s->pb, 1, 0); /* aht enabled = no */
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}
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put_bits(&s->pb, 2, 0); /* snr offset strategy = 1 */
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put_bits(&s->pb, 1, 0); /* transient pre-noise processing enabled = no */
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put_bits(&s->pb, 1, 0); /* block switch syntax enabled = no */
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put_bits(&s->pb, 1, 0); /* dither flag syntax enabled = no */
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put_bits(&s->pb, 1, 0); /* bit allocation model syntax enabled = no */
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put_bits(&s->pb, 1, 0); /* fast gain codes enabled = no */
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put_bits(&s->pb, 1, 0); /* dba syntax enabled = no */
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put_bits(&s->pb, 1, 0); /* skip field syntax enabled = no */
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put_bits(&s->pb, 1, 0); /* spx enabled = no */
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/* coupling strategy use flags */
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if (s->channel_mode > AC3_CHMODE_MONO) {
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put_bits(&s->pb, 1, s->blocks[0].cpl_in_use);
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for (blk = 1; blk < s->num_blocks; blk++) {
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AC3Block *block = &s->blocks[blk];
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put_bits(&s->pb, 1, block->new_cpl_strategy);
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if (block->new_cpl_strategy)
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put_bits(&s->pb, 1, block->cpl_in_use);
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}
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}
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/* exponent strategy */
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if (s->use_frame_exp_strategy) {
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for (ch = !s->cpl_on; ch <= s->fbw_channels; ch++)
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put_bits(&s->pb, 5, s->frame_exp_strategy[ch]);
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} else {
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for (blk = 0; blk < s->num_blocks; blk++)
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for (ch = !s->blocks[blk].cpl_in_use; ch <= s->fbw_channels; ch++)
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put_bits(&s->pb, 2, s->exp_strategy[ch][blk]);
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}
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if (s->lfe_on) {
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for (blk = 0; blk < s->num_blocks; blk++)
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put_bits(&s->pb, 1, s->exp_strategy[s->lfe_channel][blk]);
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}
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/* E-AC-3 to AC-3 converter exponent strategy (not optional when num blocks == 6) */
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if (s->num_blocks != 6) {
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put_bits(&s->pb, 1, 0);
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} else {
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for (ch = 1; ch <= s->fbw_channels; ch++) {
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if (s->use_frame_exp_strategy)
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put_bits(&s->pb, 5, s->frame_exp_strategy[ch]);
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else
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put_bits(&s->pb, 5, 0);
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}
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}
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/* snr offsets */
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put_bits(&s->pb, 6, s->coarse_snr_offset);
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put_bits(&s->pb, 4, s->fine_snr_offset[1]);
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/* block start info */
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if (s->num_blocks > 1)
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put_bits(&s->pb, 1, 0);
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}
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FF_DISABLE_DEPRECATION_WARNINGS
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const FFCodec ff_eac3_encoder = {
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.p.name = "eac3",
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.p.long_name = NULL_IF_CONFIG_SMALL("ATSC A/52 E-AC-3"),
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.p.type = AVMEDIA_TYPE_AUDIO,
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.p.id = AV_CODEC_ID_EAC3,
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.p.capabilities = AV_CODEC_CAP_DR1,
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.priv_data_size = sizeof(AC3EncodeContext),
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.init = ff_ac3_float_encode_init,
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FF_CODEC_ENCODE_CB(ff_ac3_float_encode_frame),
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.close = ff_ac3_encode_close,
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.p.sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_FLTP,
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AV_SAMPLE_FMT_NONE },
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.p.priv_class = &eac3enc_class,
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.p.supported_samplerates = ff_ac3_sample_rate_tab,
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#if FF_API_OLD_CHANNEL_LAYOUT
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.p.channel_layouts = ff_ac3_channel_layouts,
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#endif
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.p.ch_layouts = ff_ac3_ch_layouts,
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.defaults = ff_ac3_enc_defaults,
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.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP,
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};
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FF_ENABLE_DEPRECATION_WARNINGS
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