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Diffstat (limited to 'ffmpeg/libavcodec/eac3enc.c')
| -rw-r--r-- | ffmpeg/libavcodec/eac3enc.c | 268 |
1 files changed, 268 insertions, 0 deletions
diff --git a/ffmpeg/libavcodec/eac3enc.c b/ffmpeg/libavcodec/eac3enc.c new file mode 100644 index 0000000..bb9ef4f --- /dev/null +++ b/ffmpeg/libavcodec/eac3enc.c @@ -0,0 +1,268 @@ +/* + * E-AC-3 encoder + * Copyright (c) 2011 Justin Ruggles <justin.ruggles@gmail.com> + * + * This file is part of Libav. + * + * Libav 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. + * + * Libav 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 Libav; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +/** + * @file + * E-AC-3 encoder + */ + +#define CONFIG_AC3ENC_FLOAT 1 +#include "ac3enc.h" +#include "eac3enc.h" +#include "eac3_data.h" + + +#define AC3ENC_TYPE AC3ENC_TYPE_EAC3 +#include "ac3enc_opts_template.c" + +static const AVClass eac3enc_class = { + .class_name = "E-AC-3 Encoder", + .item_name = av_default_item_name, + .option = ac3_options, + .version = LIBAVUTIL_VERSION_INT, +}; + +/** + * 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]; + + +void ff_eac3_exponent_init(void) +{ + int i; + + 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; + } +} + + +void ff_eac3_get_frame_exp_strategy(AC3EncodeContext *s) +{ + int ch; + + if (s->num_blocks < 6) { + s->use_frame_exp_strategy = 0; + return; + } + + 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; + } +} + + + +void ff_eac3_set_cpl_states(AC3EncodeContext *s) +{ + int ch, blk; + int first_cpl_coords[AC3_MAX_CHANNELS]; + + /* 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; + } + } + } + + /* 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; + } + } +} + + +void ff_eac3_output_frame_header(AC3EncodeContext *s) +{ + int blk, ch; + AC3EncOptions *opt = &s->options; + + put_bits(&s->pb, 16, 0x0b77); /* sync word */ + + /* 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 */ + + /* 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); +} + + +#if CONFIG_EAC3_ENCODER +AVCodec ff_eac3_encoder = { + .name = "eac3", + .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 }, + .long_name = NULL_IF_CONFIG_SMALL("ATSC A/52 E-AC-3"), + .priv_class = &eac3enc_class, + .channel_layouts = ff_ac3_channel_layouts, + .defaults = ac3_defaults, +}; +#endif |