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Support channel layout when demuxing caf files.

This commit is contained in:
Carl Eugen Hoyos 2011-04-23 10:30:18 +02:00
parent 2a2146aac0
commit 8bb5d1c39c
3 changed files with 67 additions and 0 deletions
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58
libavformat/caf.c
View File

@ -56,3 +56,61 @@ const AVCodecTag ff_codec_caf_tags[] = {
/*{ MPEG4TwinVQ MKBETAG('t','w','v','q') },*/
{ CODEC_ID_NONE, 0 },
};
typedef struct CafChannelLayout {
int64_t channel_layout;
uint32_t layout_tag;
} CafChannelLayout;
static const CafChannelLayout caf_channel_layout[] = {
{ AV_CH_LAYOUT_MONO, (100<<16) | 1}, //< kCAFChannelLayoutTag_Mono
{ AV_CH_LAYOUT_STEREO, (101<<16) | 2}, //< kCAFChannelLayoutTag_Stereo
{ AV_CH_LAYOUT_STEREO, (102<<16) | 2}, //< kCAFChannelLayoutTag_StereoHeadphones
{ AV_CH_LAYOUT_2_1, (131<<16) | 3}, //< kCAFChannelLayoutTag_ITU_2_1
{ AV_CH_LAYOUT_2_2, (132<<16) | 4}, //< kCAFChannelLayoutTag_ITU_2_2
{ AV_CH_LAYOUT_QUAD, (108<<16) | 4}, //< kCAFChannelLayoutTag_Quadraphonic
{ AV_CH_LAYOUT_SURROUND, (113<<16) | 3}, //< kCAFChannelLayoutTag_MPEG_3_0_A
{ AV_CH_LAYOUT_4POINT0, (115<<16) | 4}, //< kCAFChannelLayoutTag_MPEG_4_0_A
{ AV_CH_LAYOUT_5POINT0_BACK, (117<<16) | 5}, //< kCAFChannelLayoutTag_MPEG_5_0_A
{ AV_CH_LAYOUT_5POINT0, (117<<16) | 5}, //< kCAFChannelLayoutTag_MPEG_5_0_A
{ AV_CH_LAYOUT_5POINT1_BACK, (121<<16) | 6}, //< kCAFChannelLayoutTag_MPEG_5_1_A
{ AV_CH_LAYOUT_5POINT1, (121<<16) | 6}, //< kCAFChannelLayoutTag_MPEG_5_1_A
{ AV_CH_LAYOUT_7POINT1, (128<<16) | 8}, //< kCAFChannelLayoutTag_MPEG_7_1_C
{ AV_CH_LAYOUT_7POINT1_WIDE, (126<<16) | 8}, //< kCAFChannelLayoutTag_MPEG_7_1_A
{ AV_CH_LAYOUT_STEREO|AV_CH_LOW_FREQUENCY, (133<<16) | 3}, //< kCAFChannelLayoutTag_DVD_4
{ AV_CH_LAYOUT_2_1|AV_CH_LOW_FREQUENCY, (134<<16) | 4}, //< kCAFChannelLayoutTag_DVD_5
{ AV_CH_LAYOUT_2_2|AV_CH_LOW_FREQUENCY, (135<<16) | 4}, //< kCAFChannelLayoutTag_DVD_6
{ AV_CH_LAYOUT_SURROUND|AV_CH_LOW_FREQUENCY, (136<<16) | 4}, //< kCAFChannelLayoutTag_DVD_10
{ AV_CH_LAYOUT_4POINT0|AV_CH_LOW_FREQUENCY, (137<<16) | 5}, //< kCAFChannelLayoutTag_DVD_11
{ 0, 0},
};
void ff_read_chan_chunk(AVFormatContext *s, int64_t size, AVCodecContext *codec)
{
uint32_t layout_tag;
AVIOContext *pb = s->pb;
const CafChannelLayout *caf_layout = caf_channel_layout;
if (size != 12) {
// Channel descriptions not implemented
av_log_ask_for_sample(s, "Unimplemented channel layout.");
avio_skip(pb, size);
return;
}
layout_tag = avio_rb32(pb);
if (layout_tag == 0x10000) { //< kCAFChannelLayoutTag_UseChannelBitmap
codec->channel_layout = avio_rb32(pb);
avio_skip(pb, 4);
return;
}
while (caf_layout->channel_layout) {
if (layout_tag == caf_layout->layout_tag) {
codec->channel_layout = caf_layout->channel_layout;
break;
}
caf_layout++;
}
if (!codec->channel_layout)
av_log(s, AV_LOG_WARNING, "Unknown channel layout.");
avio_skip(pb, 8);
}

3
libavformat/caf.h
View File

@ -27,8 +27,11 @@
#ifndef AVFORMAT_CAF_H
#define AVFORMAT_CAF_H
#include "avformat.h"
#include "internal.h"
extern const AVCodecTag ff_codec_caf_tags[];
void ff_read_chan_chunk(AVFormatContext *s, int64_t size, AVCodecContext *codec);
#endif /* AVFORMAT_CAF_H */

6
libavformat/cafdec.c
View File

@ -257,6 +257,12 @@ static int read_header(AVFormatContext *s,
read_info_chunk(s, size);
break;
case MKBETAG('c','h','a','n'):
if (size < 12)
return AVERROR_INVALIDDATA;
ff_read_chan_chunk(s, size, st->codec);
break;
default:
#define _(x) ((x) >= ' ' ? (x) : ' ')
av_log(s, AV_LOG_WARNING, "skipping CAF chunk: %08X (%c%c%c%c), size %"PRId64"\n",