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avformat: move 'chan' tag parsing to mov_chan.c to share with the CAF demuxer

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This commit is contained in:
Justin Ruggles 2012-04-07 12:40:50 -04:00
parent c0196a14b9
commit 3bab7cd128
4 changed files with 63 additions and 47 deletions
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6
libavformat/cafdec.c
View File

@ -29,6 +29,7 @@
#include "internal.h"
#include "riff.h"
#include "isom.h"
#include "mov_chan.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/intfloat.h"
#include "libavutil/dict.h"
@ -266,6 +267,11 @@ static int read_header(AVFormatContext *s)
found_data = 1;
break;
case MKBETAG('c','h','a','n'):
if ((ret = ff_mov_read_chan(s, st, size)) < 0)
return ret;
break;
/* magic cookie chunk */
case MKBETAG('k','u','k','i'):
if (read_kuki_chunk(s, size))

39
libavformat/mov.c
View File

@ -575,10 +575,6 @@ static int mov_read_dec3(MOVContext *c, AVIOContext *pb, MOVAtom atom)
static int mov_read_chan(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
AVStream *st;
uint8_t av_unused version;
uint32_t av_unused flags;
uint32_t layout_tag, bitmap, num_descr, label_mask;
int i;
if (c->fc->nb_streams < 1)
return 0;
@ -587,40 +583,7 @@ static int mov_read_chan(MOVContext *c, AVIOContext *pb, MOVAtom atom)
if (atom.size < 16)
return 0;
version = avio_r8(pb);
flags = avio_rb24(pb);
layout_tag = avio_rb32(pb);
bitmap = avio_rb32(pb);
num_descr = avio_rb32(pb);
if (atom.size < 16ULL + num_descr * 20ULL)
return 0;
av_dlog(c->fc, "chan: size=%ld version=%u flags=%u layout=%u bitmap=%u num_descr=%u\n",
atom.size, version, flags, layout_tag, bitmap, num_descr);
label_mask = 0;
for (i = 0; i < num_descr; i++) {
uint32_t label;
label = avio_rb32(pb); // mChannelLabel
avio_rb32(pb); // mChannelFlags
avio_rl32(pb); // mCoordinates[0]
avio_rl32(pb); // mCoordinates[1]
avio_rl32(pb); // mCoordinates[2]
if (layout_tag == 0) {
uint32_t mask_incr = ff_mov_get_channel_label(label);
if (mask_incr == 0) {
label_mask = 0;
break;
}
label_mask |= mask_incr;
}
}
if (layout_tag == 0)
st->codec->channel_layout = label_mask;
else
st->codec->channel_layout = ff_mov_get_channel_layout(layout_tag, bitmap);
ff_mov_read_chan(c->fc, st, atom.size - 4);
return 0;
}

46
libavformat/mov_chan.c
View File

@ -477,7 +477,7 @@ uint64_t ff_mov_get_channel_layout(uint32_t tag, uint32_t bitmap)
return layout_map[i].layout;
}
uint32_t ff_mov_get_channel_label(uint32_t label)
static uint32_t mov_get_channel_label(uint32_t label)
{
if (label == 0)
return 0;
@ -542,3 +542,47 @@ uint32_t ff_mov_get_channel_layout_tag(enum CodecID codec_id,
return tag;
}
int ff_mov_read_chan(AVFormatContext *s, AVStream *st, int64_t size)
{
AVIOContext *pb = s->pb;
uint32_t layout_tag, bitmap, num_descr, label_mask;
int i;
if (size < 12)
return AVERROR_INVALIDDATA;
layout_tag = avio_rb32(pb);
bitmap = avio_rb32(pb);
num_descr = avio_rb32(pb);
av_dlog(s, "chan: layout=%u bitmap=%u num_descr=%u\n",
layout_tag, bitmap, num_descr);
if (size < 12ULL + num_descr * 20ULL)
return 0;
label_mask = 0;
for (i = 0; i < num_descr; i++) {
uint32_t label;
label = avio_rb32(pb); // mChannelLabel
avio_rb32(pb); // mChannelFlags
avio_rl32(pb); // mCoordinates[0]
avio_rl32(pb); // mCoordinates[1]
avio_rl32(pb); // mCoordinates[2]
if (layout_tag == 0) {
uint32_t mask_incr = mov_get_channel_label(label);
if (mask_incr == 0) {
label_mask = 0;
break;
}
label_mask |= mask_incr;
}
}
if (layout_tag == 0)
st->codec->channel_layout = label_mask;
else
st->codec->channel_layout = ff_mov_get_channel_layout(layout_tag, bitmap);
return 0;
}

19
libavformat/mov_chan.h
View File

@ -29,6 +29,7 @@
#include <stdint.h>
#include "libavcodec/avcodec.h"
#include "avformat.h"
/**
* Get the channel layout for the specified channel layout tag.
@ -39,14 +40,6 @@
*/
uint64_t ff_mov_get_channel_layout(uint32_t tag, uint32_t bitmap);
/**
* Get the channel layout for the specified channel label.
*
* @param[in] label channel label
* @return channel layout mask fragment
*/
uint32_t ff_mov_get_channel_label(uint32_t label);
/**
* Get the channel layout tag for the specified codec id and channel layout.
* If the layout tag was not found, use a channel bitmap if possible.
@ -60,4 +53,14 @@ uint32_t ff_mov_get_channel_layout_tag(enum CodecID codec_id,
uint64_t channel_layout,
uint32_t *bitmap);
/**
* Read 'chan' tag from the input stream.
*
* @param s AVFormatContext
* @param st The stream to set codec values for
* @param size Remaining size in the 'chan' tag
* @return 0 if ok, or negative AVERROR code on failure
*/
int ff_mov_read_chan(AVFormatContext *s, AVStream *st, int64_t size);
#endif /* AVFORMAT_MOV_CHAN_H */