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ac3dec_float.c
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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 
33 static 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  { "heavy_compr", "heavy dynamic range compression enabled", OFFSET(heavy_compression), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, 1, PAR },
36  { "target_level", "target level in -dBFS (0 not applied)", OFFSET(target_level), AV_OPT_TYPE_INT, {.i64 = 0 }, -31, 0, PAR },
37 
38 {"dmix_mode", "Preferred Stereo Downmix Mode", OFFSET(preferred_stereo_downmix), AV_OPT_TYPE_INT, {.i64 = -1 }, -1, 2, 0, "dmix_mode"},
39 {"ltrt_cmixlev", "Lt/Rt Center Mix Level", OFFSET(ltrt_center_mix_level), AV_OPT_TYPE_FLOAT, {.dbl = -1.0 }, -1.0, 2.0, 0},
40 {"ltrt_surmixlev", "Lt/Rt Surround Mix Level", OFFSET(ltrt_surround_mix_level), AV_OPT_TYPE_FLOAT, {.dbl = -1.0 }, -1.0, 2.0, 0},
41 {"loro_cmixlev", "Lo/Ro Center Mix Level", OFFSET(loro_center_mix_level), AV_OPT_TYPE_FLOAT, {.dbl = -1.0 }, -1.0, 2.0, 0},
42 {"loro_surmixlev", "Lo/Ro Surround Mix Level", OFFSET(loro_surround_mix_level), AV_OPT_TYPE_FLOAT, {.dbl = -1.0 }, -1.0, 2.0, 0},
43 
44  { NULL},
45 };
46 
47 static const AVClass ac3_decoder_class = {
48  .class_name = "AC3 decoder",
49  .item_name = av_default_item_name,
50  .option = options,
51  .version = LIBAVUTIL_VERSION_INT,
52 };
53 
55  .name = "ac3",
56  .type = AVMEDIA_TYPE_AUDIO,
57  .id = AV_CODEC_ID_AC3,
58  .priv_data_size = sizeof (AC3DecodeContext),
60  .close = ac3_decode_end,
62  .capabilities = CODEC_CAP_DR1,
63  .long_name = NULL_IF_CONFIG_SMALL("ATSC A/52A (AC-3)"),
64  .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
66  .priv_class = &ac3_decoder_class,
67 };
68 
69 #if CONFIG_EAC3_DECODER
70 static const AVClass eac3_decoder_class = {
71  .class_name = "E-AC3 decoder",
72  .item_name = av_default_item_name,
73  .option = options,
74  .version = LIBAVUTIL_VERSION_INT,
75 };
76 
77 AVCodec ff_eac3_decoder = {
78  .name = "eac3",
79  .type = AVMEDIA_TYPE_AUDIO,
80  .id = AV_CODEC_ID_EAC3,
81  .priv_data_size = sizeof (AC3DecodeContext),
83  .close = ac3_decode_end,
85  .capabilities = CODEC_CAP_DR1,
86  .long_name = NULL_IF_CONFIG_SMALL("ATSC A/52B (AC-3, E-AC-3)"),
87  .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
89  .priv_class = &eac3_decoder_class,
90 };
91 #endif