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lavf: if id3v2 tag is present and all else fails, guess by file extension

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This commit is contained in:
Anton Khirnov 2011-04-05 12:19:35 +02:00
parent 5371803dd5
commit 56a1000917
1 changed files with 12 additions and 1 deletions
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13
libavformat/utils.c
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@ -371,7 +371,7 @@ AVInputFormat *av_probe_input_format2(AVProbeData *pd, int is_opened, int *score
{ {
AVProbeData lpd = *pd; AVProbeData lpd = *pd;
AVInputFormat *fmt1 = NULL, *fmt; AVInputFormat *fmt1 = NULL, *fmt;
int score; int score, id3 = 0;
if (lpd.buf_size > 10 && ff_id3v2_match(lpd.buf, ID3v2_DEFAULT_MAGIC)) { if (lpd.buf_size > 10 && ff_id3v2_match(lpd.buf, ID3v2_DEFAULT_MAGIC)) {
int id3len = ff_id3v2_tag_len(lpd.buf); int id3len = ff_id3v2_tag_len(lpd.buf);
@ -379,6 +379,7 @@ AVInputFormat *av_probe_input_format2(AVProbeData *pd, int is_opened, int *score
lpd.buf += id3len; lpd.buf += id3len;
lpd.buf_size -= id3len; lpd.buf_size -= id3len;
} }
id3 = 1;
} }
fmt = NULL; fmt = NULL;
@ -399,6 +400,16 @@ AVInputFormat *av_probe_input_format2(AVProbeData *pd, int is_opened, int *score
}else if (score == *score_max) }else if (score == *score_max)
fmt = NULL; fmt = NULL;
} }
/* a hack for files with huge id3v2 tags -- try to guess by file extension. */
if (!fmt && id3 && *score_max < AVPROBE_SCORE_MAX/4) {
while ((fmt = av_iformat_next(fmt)))
if (fmt->extensions && av_match_ext(lpd.filename, fmt->extensions)) {
*score_max = AVPROBE_SCORE_MAX/4;
break;
}
}
return fmt; return fmt;
} }