From c8e9ea43d004be04e4a9a07736104d099a5bf1f9 Mon Sep 17 00:00:00 2001 From: Justin Ruggles Date: Tue, 7 Jun 2011 12:47:09 -0400 Subject: Move E-AC-3 encoder functions to a separate eac3enc.c file. --- libavcodec/eac3enc.c | 131 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 131 insertions(+) create mode 100644 libavcodec/eac3enc.c (limited to 'libavcodec/eac3enc.c') diff --git a/libavcodec/eac3enc.c b/libavcodec/eac3enc.c new file mode 100644 index 0000000000..20f4b879c6 --- /dev/null +++ b/libavcodec/eac3enc.c @@ -0,0 +1,131 @@ +/* + * E-AC-3 encoder + * Copyright (c) 2011 Justin Ruggles + * + * 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" + +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 < AC3_MAX_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 = 2; + first_cpl_coords[ch] = 0; + } + } else { + first_cpl_coords[ch] = 1; + } + } + } + + /* set first cpl leak */ + for (blk = 0; blk < AC3_MAX_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, 0x3); /* number of blocks = 6 */ + } + 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 */ + put_bits(&s->pb, 1, 0); /* no mixing metadata */ + /* TODO: mixing metadata */ + put_bits(&s->pb, 1, 0); /* no info metadata */ + /* TODO: info metadata */ + put_bits(&s->pb, 1, 0); /* no additional bit stream info */ + + /* frame header */ + put_bits(&s->pb, 1, 1); /* exponent strategy syntax = each block */ + 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 < AC3_MAX_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 */ + for (blk = 0; blk < AC3_MAX_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 < AC3_MAX_BLOCKS; blk++) + put_bits(&s->pb, 1, s->exp_strategy[s->lfe_channel][blk]); + } + /* E-AC-3 to AC-3 converter exponent strategy (unfortunately not optional...) */ + for (ch = 1; ch <= s->fbw_channels; ch++) + 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 */ + put_bits(&s->pb, 1, 0); +} -- cgit v1.2.3