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 31 #include "config_components.h" 32 33 #include "ac3dec.h" 34 #include "codec_internal.h" 35 #include "eac3dec.c" 36 #include "ac3dec.c" 37 38 static const AVOption options[] = { 39 { "cons_noisegen", "enable consistent noise generation", OFFSET(consistent_noise_generation), AV_OPT_TYPE_BOOL, {.i64 = 0 }, 0, 1, PAR }, 40 { "drc_scale", "percentage of dynamic range compression to apply", OFFSET(drc_scale), AV_OPT_TYPE_FLOAT, {.dbl = 1.0}, 0.0, 6.0, PAR }, 41 { "heavy_compr", "enable heavy dynamic range compression", OFFSET(heavy_compression), AV_OPT_TYPE_BOOL, {.i64 = 0 }, 0, 1, PAR }, 42 { "target_level", "target level in -dBFS (0 not applied)", OFFSET(target_level), AV_OPT_TYPE_INT, {.i64 = 0 }, -31, 0, PAR }, 43 44 {"dmix_mode", "Preferred Stereo Downmix Mode", OFFSET(preferred_stereo_downmix), AV_OPT_TYPE_INT, {.i64 = -1 }, -1, 2, 0, "dmix_mode"}, 45 {"ltrt_cmixlev", "Lt/Rt Center Mix Level", OFFSET(ltrt_center_mix_level), AV_OPT_TYPE_FLOAT, {.dbl = -1.0 }, -1.0, 2.0, 0}, 46 {"ltrt_surmixlev", "Lt/Rt Surround Mix Level", OFFSET(ltrt_surround_mix_level), AV_OPT_TYPE_FLOAT, {.dbl = -1.0 }, -1.0, 2.0, 0}, 47 {"loro_cmixlev", "Lo/Ro Center Mix Level", OFFSET(loro_center_mix_level), AV_OPT_TYPE_FLOAT, {.dbl = -1.0 }, -1.0, 2.0, 0}, 48 {"loro_surmixlev", "Lo/Ro Surround Mix Level", OFFSET(loro_surround_mix_level), AV_OPT_TYPE_FLOAT, {.dbl = -1.0 }, -1.0, 2.0, 0}, 49 50 { "downmix", "Request a specific channel layout from the decoder", OFFSET(downmix_layout), AV_OPT_TYPE_CHLAYOUT, {.str = NULL}, .flags = PAR }, 51 52 { NULL}, 53 }; 54 55 static const AVClass ac3_eac3_decoder_class = { 56 .class_name = "(E-)AC3 decoder", 57 .item_name = av_default_item_name, 58 .option = options, 59 .version = LIBAVUTIL_VERSION_INT, 60 }; 61 62 const FFCodec ff_ac3_decoder = { 63 .p.name = "ac3", 64 .p.type = AVMEDIA_TYPE_AUDIO, 65 .p.id = AV_CODEC_ID_AC3, 66 .priv_data_size = sizeof (AC3DecodeContext), 67 .init = ac3_decode_init, 68 .close = ac3_decode_end, 69 FF_CODEC_DECODE_CB(ac3_decode_frame), 70 .p.capabilities = AV_CODEC_CAP_CHANNEL_CONF | 71 AV_CODEC_CAP_DR1, 72 .p.long_name = NULL_IF_CONFIG_SMALL("ATSC A/52A (AC-3)"), 73 .p.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP, 74 AV_SAMPLE_FMT_NONE }, 75 .p.priv_class = &ac3_eac3_decoder_class, 76 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP, 77 }; 78 79 #if CONFIG_EAC3_DECODER 80 const FFCodec ff_eac3_decoder = { 81 .p.name = "eac3", 82 .p.type = AVMEDIA_TYPE_AUDIO, 83 .p.id = AV_CODEC_ID_EAC3, 84 .priv_data_size = sizeof (AC3DecodeContext), 85 .init = ac3_decode_init, 86 .close = ac3_decode_end, 87 FF_CODEC_DECODE_CB(ac3_decode_frame), 88 .p.capabilities = AV_CODEC_CAP_CHANNEL_CONF | 89 AV_CODEC_CAP_DR1, 90 .p.long_name = NULL_IF_CONFIG_SMALL("ATSC A/52B (AC-3, E-AC-3)"), 91 .p.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP, 92 AV_SAMPLE_FMT_NONE }, 93 .p.priv_class = &ac3_eac3_decoder_class, 94 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP, 95 }; 96 #endif 97