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cdxl: add read_probe function 

Signed-off-by: Paul B Mahol <onemda@gmail.com>
This commit is contained in:
Paul B Mahol 2012-11-04 16:16:01 +00:00
parent 6e625d4198
commit 992a6a53ef
1 changed files with 43 additions and 0 deletions
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43
libavformat/cdxl.c
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@ -38,6 +38,48 @@ typedef struct CDXLDemuxContext {
int audio_stream_index;
} CDXLDemuxContext;
static int cdxl_read_probe(AVProbeData *p)
{
int score = AVPROBE_SCORE_MAX / 2 + 10;
if (p->buf_size < CDXL_HEADER_SIZE)
return 0;
/* reserved bytes should always be set to 0 */
if (AV_RN64(&p->buf[24]) || AV_RN16(&p->buf[10]))
return 0;
/* check type */
if (p->buf[0] != 1)
return 0;
/* check palette size */
if (AV_RB16(&p->buf[20]) > 512)
return 0;
/* check number of planes */
if (p->buf[18] || !p->buf[19])
return 0;
/* check widh and height */
if (!AV_RN16(&p->buf[14]) || !AV_RN16(&p->buf[16]))
return 0;
/* chunk size */
if (AV_RB32(&p->buf[2]) < AV_RB16(&p->buf[22]) + AV_RB16(&p->buf[20]) + CDXL_HEADER_SIZE)
return 0;
/* previous chunk size */
if (AV_RN32(&p->buf[6]))
score /= 2;
/* current frame number, usually starts from 1 */
if (AV_RB16(&p->buf[12]) != 1)
score /= 2;
return score;
}
static int cdxl_read_header(AVFormatContext *s)
{
CDXLDemuxContext *cdxl = s->priv_data;
@ -173,6 +215,7 @@ AVInputFormat ff_cdxl_demuxer = {
.name = "cdxl",
.long_name = NULL_IF_CONFIG_SMALL("Commodore CDXL video"),
.priv_data_size = sizeof(CDXLDemuxContext),
.read_probe = cdxl_read_probe,
.read_header = cdxl_read_header,
.read_packet = cdxl_read_packet,
.extensions = "cdxl,xl",