FFmpeg
dolby_e_parser.c
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1 /*
2  * Copyright (C) 2017 foo86
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
22 #include "avcodec.h"
23 #include "dolby_e.h"
24 
25 typedef struct DBEParseContext {
28 
30  const uint8_t **poutbuf, int *poutbuf_size,
31  const uint8_t *buf, int buf_size)
32 {
33  DBEParseContext *s1 = s2->priv_data;
34  DBEContext *s = &s1->dectx;
35  int ret;
36 
37  if ((ret = ff_dolby_e_parse_header(s, buf, buf_size)) < 0)
38  goto end;
39 
40  s2->duration = FRAME_SAMPLES;
41  switch (s->metadata.nb_channels) {
42  case 4:
44  break;
45  case 6:
47  break;
48  case 8:
50  break;
51  default:
53  avctx->ch_layout.nb_channels = s->metadata.nb_channels;
54  break;
55  }
56 
57  avctx->sample_rate = s->metadata.sample_rate;
59 
60 end:
61  /* always return the full packet. this parser isn't doing any splitting or
62  combining, only packet analysis */
63  *poutbuf = buf;
64  *poutbuf_size = buf_size;
65  return buf_size;
66 }
67 
70  .priv_data_size = sizeof(DBEParseContext),
71  .parser_parse = dolby_e_parse,
72 };
AV_SAMPLE_FMT_FLTP
@ AV_SAMPLE_FMT_FLTP
float, planar
Definition: samplefmt.h:66
ff_dolby_e_parser
const AVCodecParser ff_dolby_e_parser
Definition: dolby_e_parser.c:68
AVCodecContext::sample_rate
int sample_rate
samples per second
Definition: avcodec.h:1007
ff_dolby_e_parse_header
int ff_dolby_e_parse_header(DBEContext *s, const uint8_t *buf, int buf_size)
Initialize DBEContext and parse Dolby E metadata.
Definition: dolby_e_parse.c:97
AVChannelLayout::order
enum AVChannelOrder order
Channel order used in this layout.
Definition: channel_layout.h:306
AVChannelLayout::nb_channels
int nb_channels
Number of channels in this layout.
Definition: channel_layout.h:311
FRAME_SAMPLES
#define FRAME_SAMPLES
Definition: dolby_e.h:27
AVCodecContext::ch_layout
AVChannelLayout ch_layout
Audio channel layout.
Definition: avcodec.h:2059
DBEContext
Definition: dolby_e.h:72
AV_CHANNEL_LAYOUT_4POINT0
#define AV_CHANNEL_LAYOUT_4POINT0
Definition: channel_layout.h:374
AV_CHANNEL_LAYOUT_7POINT1
#define AV_CHANNEL_LAYOUT_7POINT1
Definition: channel_layout.h:390
s
#define s(width, name)
Definition: cbs_vp9.c:256
AV_CHANNEL_ORDER_UNSPEC
@ AV_CHANNEL_ORDER_UNSPEC
Only the channel count is specified, without any further information about the channel order.
Definition: channel_layout.h:112
s1
#define s1
Definition: regdef.h:38
AV_CODEC_ID_DOLBY_E
@ AV_CODEC_ID_DOLBY_E
Definition: codec_id.h:519
s2
#define s2
Definition: regdef.h:39
AVCodecParser::codec_ids
int codec_ids[7]
Definition: avcodec.h:2960
AVChannelLayout
An AVChannelLayout holds information about the channel layout of audio data.
Definition: channel_layout.h:301
AVCodecContext::sample_fmt
enum AVSampleFormat sample_fmt
audio sample format
Definition: avcodec.h:1023
avcodec.h
AVCodecParserContext
Definition: avcodec.h:2800
ret
ret
Definition: filter_design.txt:187
AVCodecContext
main external API structure.
Definition: avcodec.h:398
channel_layout.h
dolby_e_parse
static int dolby_e_parse(AVCodecParserContext *s2, AVCodecContext *avctx, const uint8_t **poutbuf, int *poutbuf_size, const uint8_t *buf, int buf_size)
Definition: dolby_e_parser.c:29
AVCodecParser
Definition: avcodec.h:2959
dolby_e.h
DBEParseContext::dectx
DBEContext dectx
Definition: dolby_e_parser.c:26
AV_CHANNEL_LAYOUT_5POINT1
#define AV_CHANNEL_LAYOUT_5POINT1
Definition: channel_layout.h:379
DBEParseContext
Definition: dolby_e_parser.c:25