*/
/**
- * @file mm.c
+ * @file libavformat/mm.c
* American Laser Games MM Format Demuxer
- * by Peter Ross (suxen_drol at hotmail dot com)
+ * by Peter Ross (pross@xvid.org)
*
* The MM format was used by IBM-PC ports of ALG's "arcade shooter" games,
* including Mad Dog McCree and Crime Patrol.
* http://wiki.multimedia.cx/index.php?title=American_Laser_Games_MM
*/
+#include "libavutil/intreadwrite.h"
#include "avformat.h"
#define MM_PREAMBLE_SIZE 6
unsigned int audio_pts, video_pts;
} MmDemuxContext;
-static int mm_probe(AVProbeData *p)
+static int probe(AVProbeData *p)
{
+ int len, type, fps, w, h;
+ if (p->buf_size < MM_HEADER_LEN_AV + MM_PREAMBLE_SIZE)
+ return 0;
/* the first chunk is always the header */
if (AV_RL16(&p->buf[0]) != MM_TYPE_HEADER)
return 0;
- if (AV_RL32(&p->buf[2]) != MM_HEADER_LEN_V && AV_RL32(&p->buf[2]) != MM_HEADER_LEN_AV)
+ len = AV_RL32(&p->buf[2]);
+ if (len != MM_HEADER_LEN_V && len != MM_HEADER_LEN_AV)
+ return 0;
+ fps = AV_RL16(&p->buf[8]);
+ w = AV_RL16(&p->buf[12]);
+ h = AV_RL16(&p->buf[14]);
+ if (!fps || fps > 60 || !w || w > 2048 || !h || h > 2048)
+ return 0;
+ type = AV_RL16(&p->buf[len]);
+ if (!type || type > 0x31)
return 0;
/* only return half certainty since this check is a bit sketchy */
return AVPROBE_SCORE_MAX / 2;
}
-static int mm_read_header(AVFormatContext *s,
+static int read_header(AVFormatContext *s,
AVFormatParameters *ap)
{
MmDemuxContext *mm = s->priv_data;
return 0;
}
-static int mm_read_packet(AVFormatContext *s,
+static int read_packet(AVFormatContext *s,
AVPacket *pkt)
{
MmDemuxContext *mm = s->priv_data;
return 0;
default :
- av_log(NULL, AV_LOG_INFO, "mm: unknown chunk type 0x%x\n", type);
+ av_log(s, AV_LOG_INFO, "unknown chunk type 0x%x\n", type);
url_fseek(pb, length, SEEK_CUR);
}
}
return 0;
}
-static int mm_read_close(AVFormatContext *s)
-{
- return 0;
-}
-
AVInputFormat mm_demuxer = {
"mm",
NULL_IF_CONFIG_SMALL("American Laser Games MM format"),
sizeof(MmDemuxContext),
- mm_probe,
- mm_read_header,
- mm_read_packet,
- mm_read_close,
+ probe,
+ read_header,
+ read_packet,
};