1/* 2 * AC-3 Audio Decoder 3 * This code was developed as part of Google Summer of Code 2006. 4 * E-AC-3 support was added as part of Google Summer of Code 2007. 5 * 6 * Copyright (c) 2006 Kartikey Mahendra BHATT (bhattkm at gmail dot com) 7 * Copyright (c) 2007-2008 Bartlomiej Wolowiec <bartek.wolowiec@gmail.com> 8 * Copyright (c) 2007 Justin Ruggles <justin.ruggles@gmail.com> 9 * 10 * This file is part of FFmpeg. 11 * 12 * FFmpeg is free software; you can redistribute it and/or 13 * modify it under the terms of the GNU Lesser General Public 14 * License as published by the Free Software Foundation; either 15 * version 2.1 of the License, or (at your option) any later version. 16 * 17 * FFmpeg is distributed in the hope that it will be useful, 18 * but WITHOUT ANY WARRANTY; without even the implied warranty of 19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 20 * Lesser General Public License for more details. 21 * 22 * You should have received a copy of the GNU Lesser General Public 23 * License along with FFmpeg; if not, write to the Free Software 24 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 25 */ 26 27/** 28 * Upmix delay samples from stereo to original channel layout. 29 */ 30#include "ac3dec.h" 31#include "ac3dec.c" 32 33static const AVOption options[] = { 34 { "drc_scale", "percentage of dynamic range compression to apply", OFFSET(drc_scale), AV_OPT_TYPE_FLOAT, {.dbl = 1.0}, 0.0, 6.0, PAR }, 35 36{"dmix_mode", "Preferred Stereo Downmix Mode", OFFSET(preferred_stereo_downmix), AV_OPT_TYPE_INT, {.i64 = -1 }, -1, 2, 0, "dmix_mode"}, 37{"ltrt_cmixlev", "Lt/Rt Center Mix Level", OFFSET(ltrt_center_mix_level), AV_OPT_TYPE_FLOAT, {.dbl = -1.0 }, -1.0, 2.0, 0}, 38{"ltrt_surmixlev", "Lt/Rt Surround Mix Level", OFFSET(ltrt_surround_mix_level), AV_OPT_TYPE_FLOAT, {.dbl = -1.0 }, -1.0, 2.0, 0}, 39{"loro_cmixlev", "Lo/Ro Center Mix Level", OFFSET(loro_center_mix_level), AV_OPT_TYPE_FLOAT, {.dbl = -1.0 }, -1.0, 2.0, 0}, 40{"loro_surmixlev", "Lo/Ro Surround Mix Level", OFFSET(loro_surround_mix_level), AV_OPT_TYPE_FLOAT, {.dbl = -1.0 }, -1.0, 2.0, 0}, 41 42 { NULL}, 43}; 44 45static const AVClass ac3_decoder_class = { 46 .class_name = "AC3 decoder", 47 .item_name = av_default_item_name, 48 .option = options, 49 .version = LIBAVUTIL_VERSION_INT, 50}; 51 52AVCodec ff_ac3_decoder = { 53 .name = "ac3", 54 .type = AVMEDIA_TYPE_AUDIO, 55 .id = AV_CODEC_ID_AC3, 56 .priv_data_size = sizeof (AC3DecodeContext), 57 .init = ac3_decode_init, 58 .close = ac3_decode_end, 59 .decode = ac3_decode_frame, 60 .capabilities = CODEC_CAP_DR1, 61 .long_name = NULL_IF_CONFIG_SMALL("ATSC A/52A (AC-3)"), 62 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP, 63 AV_SAMPLE_FMT_NONE }, 64 .priv_class = &ac3_decoder_class, 65}; 66 67#if CONFIG_EAC3_DECODER 68static const AVClass eac3_decoder_class = { 69 .class_name = "E-AC3 decoder", 70 .item_name = av_default_item_name, 71 .option = options, 72 .version = LIBAVUTIL_VERSION_INT, 73}; 74 75AVCodec ff_eac3_decoder = { 76 .name = "eac3", 77 .type = AVMEDIA_TYPE_AUDIO, 78 .id = AV_CODEC_ID_EAC3, 79 .priv_data_size = sizeof (AC3DecodeContext), 80 .init = ac3_decode_init, 81 .close = ac3_decode_end, 82 .decode = ac3_decode_frame, 83 .capabilities = CODEC_CAP_DR1, 84 .long_name = NULL_IF_CONFIG_SMALL("ATSC A/52B (AC-3, E-AC-3)"), 85 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP, 86 AV_SAMPLE_FMT_NONE }, 87 .priv_class = &eac3_decoder_class, 88}; 89#endif 90