0,0 → 1,270 |
/* |
* E-AC-3 encoder |
* Copyright (c) 2011 Justin Ruggles <justin.ruggles@gmail.com> |
* |
* 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 |
*/ |
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/** |
* @file |
* E-AC-3 encoder |
*/ |
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#define CONFIG_AC3ENC_FLOAT 1 |
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#include "libavutil/attributes.h" |
#include "ac3enc.h" |
#include "eac3enc.h" |
#include "eac3_data.h" |
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#define AC3ENC_TYPE AC3ENC_TYPE_EAC3 |
#include "ac3enc_opts_template.c" |
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static const AVClass eac3enc_class = { |
.class_name = "E-AC-3 Encoder", |
.item_name = av_default_item_name, |
.option = ac3_options, |
.version = LIBAVUTIL_VERSION_INT, |
}; |
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/** |
* LUT for finding a matching frame exponent strategy index from a set of |
* exponent strategies for a single channel across all 6 blocks. |
*/ |
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) |
{ |
int i; |
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memset(eac3_frame_expstr_index_tab, -1, sizeof(eac3_frame_expstr_index_tab)); |
for (i = 0; i < 32; i++) { |
eac3_frame_expstr_index_tab[ff_eac3_frm_expstr[i][0]-1] |
[ff_eac3_frm_expstr[i][1]] |
[ff_eac3_frm_expstr[i][2]] |
[ff_eac3_frm_expstr[i][3]] |
[ff_eac3_frm_expstr[i][4]] |
[ff_eac3_frm_expstr[i][5]] = i; |
} |
} |
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void ff_eac3_get_frame_exp_strategy(AC3EncodeContext *s) |
{ |
int ch; |
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if (s->num_blocks < 6) { |
s->use_frame_exp_strategy = 0; |
return; |
} |
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s->use_frame_exp_strategy = 1; |
for (ch = !s->cpl_on; ch <= s->fbw_channels; ch++) { |
int expstr = eac3_frame_expstr_index_tab[s->exp_strategy[ch][0]-1] |
[s->exp_strategy[ch][1]] |
[s->exp_strategy[ch][2]] |
[s->exp_strategy[ch][3]] |
[s->exp_strategy[ch][4]] |
[s->exp_strategy[ch][5]]; |
if (expstr < 0) { |
s->use_frame_exp_strategy = 0; |
break; |
} |
s->frame_exp_strategy[ch] = expstr; |
} |
} |
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void ff_eac3_set_cpl_states(AC3EncodeContext *s) |
{ |
int ch, blk; |
int first_cpl_coords[AC3_MAX_CHANNELS]; |
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/* set first cpl coords */ |
for (ch = 1; ch <= s->fbw_channels; ch++) |
first_cpl_coords[ch] = 1; |
for (blk = 0; blk < s->num_blocks; blk++) { |
AC3Block *block = &s->blocks[blk]; |
for (ch = 1; ch <= s->fbw_channels; ch++) { |
if (block->channel_in_cpl[ch]) { |
if (first_cpl_coords[ch]) { |
block->new_cpl_coords[ch] = 2; |
first_cpl_coords[ch] = 0; |
} |
} else { |
first_cpl_coords[ch] = 1; |
} |
} |
} |
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/* set first cpl leak */ |
for (blk = 0; blk < s->num_blocks; blk++) { |
AC3Block *block = &s->blocks[blk]; |
if (block->cpl_in_use) { |
block->new_cpl_leak = 2; |
break; |
} |
} |
} |
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void ff_eac3_output_frame_header(AC3EncodeContext *s) |
{ |
int blk, ch; |
AC3EncOptions *opt = &s->options; |
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put_bits(&s->pb, 16, 0x0b77); /* sync word */ |
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/* BSI header */ |
put_bits(&s->pb, 2, 0); /* stream type = independent */ |
put_bits(&s->pb, 3, 0); /* substream id = 0 */ |
put_bits(&s->pb, 11, (s->frame_size / 2) - 1); /* frame size */ |
if (s->bit_alloc.sr_shift) { |
put_bits(&s->pb, 2, 0x3); /* fscod2 */ |
put_bits(&s->pb, 2, s->bit_alloc.sr_code); /* sample rate code */ |
} else { |
put_bits(&s->pb, 2, s->bit_alloc.sr_code); /* sample rate code */ |
put_bits(&s->pb, 2, s->num_blks_code); /* number of blocks */ |
} |
put_bits(&s->pb, 3, s->channel_mode); /* audio coding mode */ |
put_bits(&s->pb, 1, s->lfe_on); /* LFE channel indicator */ |
put_bits(&s->pb, 5, s->bitstream_id); /* bitstream id (EAC3=16) */ |
put_bits(&s->pb, 5, -opt->dialogue_level); /* dialogue normalization level */ |
put_bits(&s->pb, 1, 0); /* no compression gain */ |
/* mixing metadata*/ |
put_bits(&s->pb, 1, opt->eac3_mixing_metadata); |
if (opt->eac3_mixing_metadata) { |
if (s->channel_mode > AC3_CHMODE_STEREO) |
put_bits(&s->pb, 2, opt->preferred_stereo_downmix); |
if (s->has_center) { |
put_bits(&s->pb, 3, s->ltrt_center_mix_level); |
put_bits(&s->pb, 3, s->loro_center_mix_level); |
} |
if (s->has_surround) { |
put_bits(&s->pb, 3, s->ltrt_surround_mix_level); |
put_bits(&s->pb, 3, s->loro_surround_mix_level); |
} |
if (s->lfe_on) |
put_bits(&s->pb, 1, 0); |
put_bits(&s->pb, 1, 0); /* no program scale */ |
put_bits(&s->pb, 1, 0); /* no ext program scale */ |
put_bits(&s->pb, 2, 0); /* no mixing parameters */ |
if (s->channel_mode < AC3_CHMODE_STEREO) |
put_bits(&s->pb, 1, 0); /* no pan info */ |
put_bits(&s->pb, 1, 0); /* no frame mix config info */ |
} |
/* info metadata*/ |
put_bits(&s->pb, 1, opt->eac3_info_metadata); |
if (opt->eac3_info_metadata) { |
put_bits(&s->pb, 3, s->bitstream_mode); |
put_bits(&s->pb, 1, opt->copyright); |
put_bits(&s->pb, 1, opt->original); |
if (s->channel_mode == AC3_CHMODE_STEREO) { |
put_bits(&s->pb, 2, opt->dolby_surround_mode); |
put_bits(&s->pb, 2, opt->dolby_headphone_mode); |
} |
if (s->channel_mode >= AC3_CHMODE_2F2R) |
put_bits(&s->pb, 2, opt->dolby_surround_ex_mode); |
put_bits(&s->pb, 1, opt->audio_production_info); |
if (opt->audio_production_info) { |
put_bits(&s->pb, 5, opt->mixing_level - 80); |
put_bits(&s->pb, 2, opt->room_type); |
put_bits(&s->pb, 1, opt->ad_converter_type); |
} |
put_bits(&s->pb, 1, 0); |
} |
if (s->num_blocks != 6) |
put_bits(&s->pb, 1, !(s->avctx->frame_number % 6)); /* converter sync flag */ |
put_bits(&s->pb, 1, 0); /* no additional bit stream info */ |
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/* frame header */ |
if (s->num_blocks == 6) { |
put_bits(&s->pb, 1, !s->use_frame_exp_strategy);/* exponent strategy syntax */ |
put_bits(&s->pb, 1, 0); /* aht enabled = no */ |
} |
put_bits(&s->pb, 2, 0); /* snr offset strategy = 1 */ |
put_bits(&s->pb, 1, 0); /* transient pre-noise processing enabled = no */ |
put_bits(&s->pb, 1, 0); /* block switch syntax enabled = no */ |
put_bits(&s->pb, 1, 0); /* dither flag syntax enabled = no */ |
put_bits(&s->pb, 1, 0); /* bit allocation model syntax enabled = no */ |
put_bits(&s->pb, 1, 0); /* fast gain codes enabled = no */ |
put_bits(&s->pb, 1, 0); /* dba syntax enabled = no */ |
put_bits(&s->pb, 1, 0); /* skip field syntax enabled = no */ |
put_bits(&s->pb, 1, 0); /* spx enabled = no */ |
/* coupling strategy use flags */ |
if (s->channel_mode > AC3_CHMODE_MONO) { |
put_bits(&s->pb, 1, s->blocks[0].cpl_in_use); |
for (blk = 1; blk < s->num_blocks; blk++) { |
AC3Block *block = &s->blocks[blk]; |
put_bits(&s->pb, 1, block->new_cpl_strategy); |
if (block->new_cpl_strategy) |
put_bits(&s->pb, 1, block->cpl_in_use); |
} |
} |
/* exponent strategy */ |
if (s->use_frame_exp_strategy) { |
for (ch = !s->cpl_on; ch <= s->fbw_channels; ch++) |
put_bits(&s->pb, 5, s->frame_exp_strategy[ch]); |
} else { |
for (blk = 0; blk < s->num_blocks; blk++) |
for (ch = !s->blocks[blk].cpl_in_use; ch <= s->fbw_channels; ch++) |
put_bits(&s->pb, 2, s->exp_strategy[ch][blk]); |
} |
if (s->lfe_on) { |
for (blk = 0; blk < s->num_blocks; blk++) |
put_bits(&s->pb, 1, s->exp_strategy[s->lfe_channel][blk]); |
} |
/* E-AC-3 to AC-3 converter exponent strategy (not optional when num blocks == 6) */ |
if (s->num_blocks != 6) { |
put_bits(&s->pb, 1, 0); |
} else { |
for (ch = 1; ch <= s->fbw_channels; ch++) { |
if (s->use_frame_exp_strategy) |
put_bits(&s->pb, 5, s->frame_exp_strategy[ch]); |
else |
put_bits(&s->pb, 5, 0); |
} |
} |
/* snr offsets */ |
put_bits(&s->pb, 6, s->coarse_snr_offset); |
put_bits(&s->pb, 4, s->fine_snr_offset[1]); |
/* block start info */ |
if (s->num_blocks > 1) |
put_bits(&s->pb, 1, 0); |
} |
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#if CONFIG_EAC3_ENCODER |
AVCodec ff_eac3_encoder = { |
.name = "eac3", |
.long_name = NULL_IF_CONFIG_SMALL("ATSC A/52 E-AC-3"), |
.type = AVMEDIA_TYPE_AUDIO, |
.id = AV_CODEC_ID_EAC3, |
.priv_data_size = sizeof(AC3EncodeContext), |
.init = ff_ac3_encode_init, |
.encode2 = ff_ac3_float_encode_frame, |
.close = ff_ac3_encode_close, |
.sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_FLTP, |
AV_SAMPLE_FMT_NONE }, |
.priv_class = &eac3enc_class, |
.channel_layouts = ff_ac3_channel_layouts, |
.defaults = ac3_defaults, |
}; |
#endif |