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 "eac3dec.c" 32 #include "ac3dec.c" 33 34 static const AVOption options[] = { 35 { "cons_noisegen", "enable consistent noise generation", OFFSET(consistent_noise_generation), AV_OPT_TYPE_BOOL, {.i64 = 0 }, 0, 1, PAR }, 36 { "drc_scale", "percentage of dynamic range compression to apply", OFFSET(drc_scale), AV_OPT_TYPE_FLOAT, {.dbl = 1.0}, 0.0, 6.0, PAR }, 37 { "heavy_compr", "enable heavy dynamic range compression", OFFSET(heavy_compression), AV_OPT_TYPE_BOOL, {.i64 = 0 }, 0, 1, PAR }, 38 { "target_level", "target level in -dBFS (0 not applied)", OFFSET(target_level), AV_OPT_TYPE_INT, {.i64 = 0 }, -31, 0, PAR }, 39 40 {"dmix_mode", "Preferred Stereo Downmix Mode", OFFSET(preferred_stereo_downmix), AV_OPT_TYPE_INT, {.i64 = -1 }, -1, 2, 0, "dmix_mode"}, 41 {"ltrt_cmixlev", "Lt/Rt Center Mix Level", OFFSET(ltrt_center_mix_level), AV_OPT_TYPE_FLOAT, {.dbl = -1.0 }, -1.0, 2.0, 0}, 42 {"ltrt_surmixlev", "Lt/Rt Surround Mix Level", OFFSET(ltrt_surround_mix_level), AV_OPT_TYPE_FLOAT, {.dbl = -1.0 }, -1.0, 2.0, 0}, 43 {"loro_cmixlev", "Lo/Ro Center Mix Level", OFFSET(loro_center_mix_level), AV_OPT_TYPE_FLOAT, {.dbl = -1.0 }, -1.0, 2.0, 0}, 44 {"loro_surmixlev", "Lo/Ro Surround Mix Level", OFFSET(loro_surround_mix_level), AV_OPT_TYPE_FLOAT, {.dbl = -1.0 }, -1.0, 2.0, 0}, 45 46 { NULL}, 47 }; 48 49 static const AVClass ac3_decoder_class = { 50 .class_name = "AC3 decoder", 51 .item_name = av_default_item_name, 52 .option = options, 53 .version = LIBAVUTIL_VERSION_INT, 54 }; 55 56 AVCodec ff_ac3_decoder = { 57 .name = "ac3", 58 .type = AVMEDIA_TYPE_AUDIO, 59 .id = AV_CODEC_ID_AC3, 60 .priv_data_size = sizeof (AC3DecodeContext), 61 .init = ac3_decode_init, 62 .close = ac3_decode_end, 63 .decode = ac3_decode_frame, 64 .capabilities = AV_CODEC_CAP_CHANNEL_CONF | 65 AV_CODEC_CAP_DR1, 66 .long_name = NULL_IF_CONFIG_SMALL("ATSC A/52A (AC-3)"), 67 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP, 68 AV_SAMPLE_FMT_NONE }, 69 .priv_class = &ac3_decoder_class, 70 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP, 71 }; 72 73 #if CONFIG_EAC3_DECODER 74 static const AVClass eac3_decoder_class = { 75 .class_name = "E-AC3 decoder", 76 .item_name = av_default_item_name, 77 .option = options, 78 .version = LIBAVUTIL_VERSION_INT, 79 }; 80 81 AVCodec ff_eac3_decoder = { 82 .name = "eac3", 83 .type = AVMEDIA_TYPE_AUDIO, 84 .id = AV_CODEC_ID_EAC3, 85 .priv_data_size = sizeof (AC3DecodeContext), 86 .init = ac3_decode_init, 87 .close = ac3_decode_end, 88 .decode = ac3_decode_frame, 89 .capabilities = AV_CODEC_CAP_CHANNEL_CONF | 90 AV_CODEC_CAP_DR1, 91 .long_name = NULL_IF_CONFIG_SMALL("ATSC A/52B (AC-3, E-AC-3)"), 92 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP, 93 AV_SAMPLE_FMT_NONE }, 94 .priv_class = &eac3_decoder_class, 95 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP, 96 }; 97 #endif 98