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/* |
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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 "eac3enc.h" |
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#include "eac3_data.h" |
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#define AC3ENC_TYPE AC3ENC_TYPE_EAC3 |
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#include "ac3enc_opts_template.c" |
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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 = ac3_options, |
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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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✓✓ |
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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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|
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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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✗✓ |
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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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✓✓ |
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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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✗✓ |
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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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✓✓ |
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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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✓✓ |
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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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✓✓ |
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for (ch = 1; ch <= s->fbw_channels; ch++) { |
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✓✗ |
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if (block->channel_in_cpl[ch]) { |
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✓✓ |
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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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✓✗ |
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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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✓✗ |
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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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✗✓ |
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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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✗✓ |
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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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✗✓ |
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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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✗✓ |
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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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✓✗ |
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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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✓✗ |
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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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✓✓ |
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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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✗✓ |
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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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✓✗ |
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if (s->use_frame_exp_strategy) { |
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✓✓ |
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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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✗✓ |
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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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✗✓ |
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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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✓✓ |
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for (ch = 1; ch <= s->fbw_channels; ch++) { |
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✓✗ |
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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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✓✗ |
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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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AVCodec ff_eac3_encoder = { |
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.name = "eac3", |
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.long_name = NULL_IF_CONFIG_SMALL("ATSC A/52 E-AC-3"), |
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.type = AVMEDIA_TYPE_AUDIO, |
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.id = AV_CODEC_ID_EAC3, |
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.priv_data_size = sizeof(AC3EncodeContext), |
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.init = ff_ac3_float_encode_init, |
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.encode2 = ff_ac3_float_encode_frame, |
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.close = ff_ac3_encode_close, |
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.sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_FLTP, |
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AV_SAMPLE_FMT_NONE }, |
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.priv_class = &eac3enc_class, |
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.supported_samplerates = ff_ac3_sample_rate_tab, |
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.channel_layouts = ff_ac3_channel_layouts, |
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.defaults = ac3_defaults, |
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.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP, |
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}; |