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Search for ipmovie signature beyond the start of the file.

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This allows to play directly files that combine player and movie into
a single executable like http://samples.mplayerhq.hu/game-formats/interplay-mve/DES3S.EXE

Originally committed as revision 19769 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Reimar Döffinger 2009-09-05 15:41:32 +00:00
parent 78bfe6c3c1
commit 61e8efd35e
1 changed files with 16 additions and 4 deletions
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20
libavformat/ipmovie.c
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@ -501,10 +501,14 @@ static const char signature[] = "Interplay MVE File\x1A\0\x1A";
static int ipmovie_probe(AVProbeData *p)
{
if (memcmp(p->buf, signature, sizeof(signature)) != 0)
return 0;
uint8_t *b = p->buf;
uint8_t *b_end = p->buf + p->buf_size - sizeof(signature);
do {
if (memcmp(b++, signature, sizeof(signature)) == 0)
return AVPROBE_SCORE_MAX;
} while (b < b_end);
return AVPROBE_SCORE_MAX;
return 0;
}
static int ipmovie_read_header(AVFormatContext *s,
@ -516,14 +520,22 @@ static int ipmovie_read_header(AVFormatContext *s,
AVStream *st;
unsigned char chunk_preamble[CHUNK_PREAMBLE_SIZE];
int chunk_type;
uint8_t signature_buffer[sizeof(signature)];
get_buffer(pb, signature_buffer, sizeof(signature_buffer));
while (memcmp(signature_buffer, signature, sizeof(signature))) {
memmove(signature_buffer, signature_buffer + 1, sizeof(signature_buffer) - 1);
signature_buffer[sizeof(signature_buffer) - 1] = get_byte(pb);
if (url_feof(pb))
return AVERROR_EOF;
}
/* initialize private context members */
ipmovie->video_pts = ipmovie->audio_frame_count = 0;
ipmovie->audio_chunk_offset = ipmovie->video_chunk_offset =
ipmovie->decode_map_chunk_offset = 0;
/* on the first read, this will position the stream at the first chunk */
ipmovie->next_chunk_offset = sizeof(signature) + 4;
ipmovie->next_chunk_offset = url_ftell(pb) + 4;
/* process the first chunk which should be CHUNK_INIT_VIDEO */
if (process_ipmovie_chunk(ipmovie, pb, &pkt) != CHUNK_INIT_VIDEO)