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lavf/avidec: Read metadata EXIF tags from AVIF tag. Based on patch by Gregory Wolfe (Kodak Alaris) <gregory.wolfe@kodakalaris.com>.

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Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Thilo Borgmann 2014-03-26 11:25:40 +01:00 committed by Michael Niedermayer
parent 8c161d7884
commit 2f08dad028
1 changed files with 45 additions and 0 deletions
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45
libavformat/avidec.c
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@ -34,6 +34,8 @@
#include "dv.h"
#include "internal.h"
#include "riff.h"
#include "libavcodec/bytestream.h"
#include "libavcodec/exif.h"
typedef struct AVIStream {
int64_t frame_offset; /* current frame (video) or byte (audio) counter
@ -379,6 +381,44 @@ static void avi_read_nikon(AVFormatContext *s, uint64_t end)
}
}
static int avi_extract_stream_metadata(AVStream *st)
{
GetByteContext gb;
uint8_t *data = st->codec->extradata;
int data_size = st->codec->extradata_size;
int tag, offset;
if (!data || data_size < 8) {
return AVERROR_INVALIDDATA;
}
bytestream2_init(&gb, data, data_size);
tag = bytestream2_get_le32(&gb);
switch (tag) {
case MKTAG('A', 'V', 'I', 'F'):
// skip 4 byte padding
bytestream2_skip(&gb, 4);
offset = bytestream2_tell(&gb);
bytestream2_init(&gb, data + offset, data_size - offset);
// decode EXIF tags from IFD, AVI is always little-endian
return avpriv_exif_decode_ifd(st->codec, &gb, 1, 0, &st->metadata);
break;
case MKTAG('C', 'A', 'S', 'I'):
avpriv_request_sample(st->codec, "RIFF stream data tag type CASI (%u)", tag);
break;
case MKTAG('Z', 'o', 'r', 'a'):
avpriv_request_sample(st->codec, "RIFF stream data tag type Zora (%u)", tag);
break;
default:
break;
}
return 0;
}
static int calculate_bitrate(AVFormatContext *s)
{
AVIContext *avi = s->priv_data;
@ -829,6 +869,11 @@ static int avi_read_header(AVFormatContext *s)
if (st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
avio_r8(pb);
ret = avi_extract_stream_metadata(st);
if (ret < 0) {
av_log(s, AV_LOG_WARNING, "could not decoding EXIF data in stream header.\n");
}
}
break;
case MKTAG('i', 'n', 'd', 'x'):