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Parse 'bext' metadata in the wav demuxer

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Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Tomas Härdin 2011-05-18 13:48:39 +02:00 committed by Michael Niedermayer
parent 40612f2601
commit 7e5cb2ef51
1 changed files with 84 additions and 0 deletions
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84
libavformat/wav.c
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@ -204,6 +204,86 @@ static int wav_parse_fmt_tag(AVFormatContext *s, int64_t size, AVStream **st)
return 0;
}
static inline int wav_parse_bext_string(AVFormatContext *s, const char *key, int length)
{
char temp[257];
int ret;
if ((ret = avio_read(s->pb, temp, length)) < 0)
return ret;
temp[length] = 0;
if (strlen(temp))
return av_metadata_set2(&s->metadata, key, temp, 0);
return 0;
}
static int wav_parse_bext_tag(AVFormatContext *s, int64_t size)
{
char temp[131], *coding_history;
int ret, x;
uint64_t time_reference;
int64_t umid_parts[8], umid_mask = 0;
if ((ret = wav_parse_bext_string(s, "description", 256)) < 0 ||
(ret = wav_parse_bext_string(s, "originator", 32)) < 0 ||
(ret = wav_parse_bext_string(s, "originator_reference", 32)) < 0 ||
(ret = wav_parse_bext_string(s, "origination_date", 10)) < 0 ||
(ret = wav_parse_bext_string(s, "origination_time", 8)) < 0)
return ret;
time_reference = avio_rl64(s->pb);
snprintf(temp, sizeof(temp), "%lu", time_reference);
if ((ret = av_metadata_set2(&s->metadata, "time_reference", temp, 0)) < 0)
return ret;
/* check if version is >= 1, in which case an UMID may be present */
if (avio_rl16(s->pb) >= 1) {
for (x = 0; x < 8; x++)
umid_mask |= umid_parts[x] = avio_rb64(s->pb);
if (umid_mask) {
/* the string formatting below is per SMPTE 330M-2004 Annex C */
if (umid_parts[4] == 0 && umid_parts[5] == 0 && umid_parts[6] == 0 && umid_parts[7] == 0) {
/* basic UMID */
snprintf(temp, sizeof(temp), "0x%016lX%016lX%016lX%016lX",
umid_parts[0], umid_parts[1], umid_parts[2], umid_parts[3]);
} else {
/* extended UMID */
snprintf(temp, sizeof(temp), "0x%016lX%016lX%016lX%016lX%016lX%016lX%016lX%016lX",
umid_parts[0], umid_parts[1], umid_parts[2], umid_parts[3],
umid_parts[4], umid_parts[5], umid_parts[6], umid_parts[7]);
}
if ((ret = av_metadata_set2(&s->metadata, "umid", temp, 0)) < 0)
return ret;
}
avio_skip(s->pb, 190);
} else
avio_skip(s->pb, 254);
if (size > 602) {
/* CodingHistory present */
size -= 602;
if (!(coding_history = av_malloc(size+1)))
return AVERROR(ENOMEM);
if ((ret = avio_read(s->pb, coding_history, size)) < 0)
return ret;
coding_history[size] = 0;
if ((ret = av_metadata_set2(&s->metadata, "coding_history", coding_history,
AV_METADATA_DONT_STRDUP_VAL)) < 0)
return ret;
}
return 0;
}
/* wav input */
static int wav_read_header(AVFormatContext *s,
AVFormatParameters *ap)
@ -295,6 +375,10 @@ static int wav_read_header(AVFormatContext *s,
if(!sample_count)
sample_count = avio_rl32(pb);
break;
case MKTAG('b','e','x','t'):
if ((ret = wav_parse_bext_tag(s, size)) < 0)
return ret;
break;
}
avio_seek(pb, next_tag_ofs, SEEK_SET);
}