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Code Issues Releases Activity

asfdec: Account for different Format Data sizes

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Some muxers may use the BMP_HEADER Format Data size instead
of the ASF-specific one.

Bug-Id: 1020
CC: libav-stable@libav.org

Signed-off-by: Diego Biurrun <diego@biurrun.de>
This commit is contained in:
Alexandra Hájková 2017-02-08 12:51:37 +01:00 committed by Diego Biurrun
parent 871b4f3654
commit 0539d84d98
5 changed files with 15 additions and 10 deletions
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12
libavformat/asfdec.c
View File

@ -691,20 +691,22 @@ static int asf_read_properties(AVFormatContext *s, const GUIDParseTable *g)
static int parse_video_info(AVIOContext *pb, AVStream *st)
{
uint16_t size;
uint16_t size_asf; // ASF-specific Format Data size
uint32_t size_bmp; // BMP_HEADER-specific Format Data size
unsigned int tag;
st->codecpar->width = avio_rl32(pb);
st->codecpar->height = avio_rl32(pb);
avio_skip(pb, 1); // skip reserved flags
size = avio_rl16(pb); // size of the Format Data
tag = ff_get_bmp_header(pb, st);
size_asf = avio_rl16(pb);
tag = ff_get_bmp_header(pb, st, &size_bmp);
st->codecpar->codec_tag = tag;
st->codecpar->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag);
size_bmp = FFMAX(size_asf, size_bmp);
if (size > BMP_HEADER_SIZE) {
if (size_bmp > BMP_HEADER_SIZE) {
int ret;
st->codecpar->extradata_size = size - BMP_HEADER_SIZE;
st->codecpar->extradata_size = size_bmp - BMP_HEADER_SIZE;
if (!(st->codecpar->extradata = av_malloc(st->codecpar->extradata_size +
AV_INPUT_BUFFER_PADDING_SIZE))) {
st->codecpar->extradata_size = 0;

2
libavformat/avidec.c
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@ -613,7 +613,7 @@ static int avi_read_header(AVFormatContext *s)
avio_skip(pb, size);
break;
}
tag1 = ff_get_bmp_header(pb, st);
tag1 = ff_get_bmp_header(pb, st, NULL);
if (tag1 == MKTAG('D', 'X', 'S', 'B') ||
tag1 == MKTAG('D', 'X', 'S', 'A')) {

3
libavformat/riff.h
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@ -41,9 +41,10 @@ void ff_end_tag(AVIOContext *pb, int64_t start);
/**
* Read BITMAPINFOHEADER structure and set AVStream codec width, height and
* bits_per_encoded_sample fields. Does not read extradata.
* Writes the size of the BMP file to *size.
* @return codec tag
*/
int ff_get_bmp_header(AVIOContext *pb, AVStream *st);
int ff_get_bmp_header(AVIOContext *pb, AVStream *st, uint32_t *size);
void ff_put_bmp_header(AVIOContext *pb, AVCodecParameters *par, const AVCodecTag *tags, int for_asf);
int ff_put_wav_header(AVFormatContext *s, AVIOContext *pb, AVCodecParameters *par);

6
libavformat/riffdec.c
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@ -180,10 +180,12 @@ enum AVCodecID ff_wav_codec_get_id(unsigned int tag, int bps)
return id;
}
int ff_get_bmp_header(AVIOContext *pb, AVStream *st)
int ff_get_bmp_header(AVIOContext *pb, AVStream *st, uint32_t *size)
{
int tag1;
avio_rl32(pb); /* size */
uint32_t size_ = avio_rl32(pb);
if (size)
*size = size_;
st->codecpar->width = avio_rl32(pb);
st->codecpar->height = (int32_t)avio_rl32(pb);
avio_rl16(pb); /* planes */

2
libavformat/wtv.c
View File

@ -586,7 +586,7 @@ static int parse_videoinfoheader2(AVFormatContext *s, AVStream *st)
AVIOContext *pb = wtv->pb;
avio_skip(pb, 72); // picture aspect ratio is unreliable
ff_get_bmp_header(pb, st);
ff_get_bmp_header(pb, st, NULL);
return 72 + 40;
}