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 */
33
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
47 };
48
54 };
55
69 };
70
71 #if CONFIG_EAC3_DECODER
72 static const AVClass eac3_decoder_class = {
77 };
78
91 .priv_class = &eac3_decoder_class,
92 };
93 #endif
#define LIBAVUTIL_VERSION_INT
static av_cold int init(AVCodecContext *avctx)
const char * av_default_item_name(void *ptr)
Return the context name.
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
static av_cold int ac3_decode_end(AVCodecContext *avctx)
Uninitialize the AC-3 decoder.
Common code between the AC-3 and E-AC-3 decoders.
static const AVOption options[]
Upmix delay samples from stereo to original channel layout.
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
const char * name
Name of the codec implementation.
static int ac3_decode_frame(AVCodecContext *avctx, void *data, int *got_frame_ptr, AVPacket *avpkt)
Decode a single AC-3 frame.
AVSampleFormat
Audio sample formats.
Describe the class of an AVClass context structure.
static const AVClass ac3_decoder_class
static av_cold int ac3_decode_init(AVCodecContext *avctx)
AVCodec initialization.
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.