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w64: fact guid support 

Signed-off-by: Paul B Mahol <onemda@gmail.com>
This commit is contained in:
Paul B Mahol 2013-01-05 15:02:08 +00:00
parent e13c5abbd7
commit 3174137d41
4 changed files with 29 additions and 1 deletions
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3
libavformat/w64.c
View File

@ -29,6 +29,9 @@ const uint8_t ff_w64_guid_wave[16] = { 'w', 'a', 'v', 'e',
const uint8_t ff_w64_guid_fmt [16] = { 'f', 'm', 't', ' ',
0xF3, 0xAC, 0xD3, 0x11, 0x8C, 0xD1, 0x00, 0xC0, 0x4F, 0x8E, 0xDB, 0x8A };
const uint8_t ff_w64_guid_fact[16] = { 'f', 'a', 'c', 't',
0xF3, 0xAC, 0xD3, 0x11, 0x8C, 0xD1, 0x00, 0xC0, 0x4F, 0x8E, 0xDB, 0x8A };
const uint8_t ff_w64_guid_data[16] = { 'd', 'a', 't', 'a',
0xF3, 0xAC, 0xD3, 0x11, 0x8C, 0xD1, 0x00, 0xC0, 0x4F, 0x8E, 0xDB, 0x8A };

1
libavformat/w64.h
View File

@ -24,6 +24,7 @@
extern const uint8_t ff_w64_guid_riff[16];
extern const uint8_t ff_w64_guid_wave[16];
extern const uint8_t ff_w64_guid_fmt [16];
extern const uint8_t ff_w64_guid_fact[16];
extern const uint8_t ff_w64_guid_data[16];
extern const uint8_t ff_w64_guid_summarylist[16];

6
libavformat/wavdec.c
View File

@ -610,6 +610,12 @@ static int w64_read_header(AVFormatContext *s)
avio_skip(pb, FFALIGN(size, INT64_C(8)) - size);
avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
} else if (!memcmp(guid, ff_w64_guid_fact, 16)) {
int64_t samples;
samples = avio_rl64(pb);
if (samples > 0)
st->duration = samples;
} else if (!memcmp(guid, ff_w64_guid_data, 16)) {
wav->data_end = avio_tell(pb) + size - 24;

20
libavformat/wavenc.c
View File

@ -263,6 +263,14 @@ static int w64_write_header(AVFormatContext *s)
return ret;
}
end_guid(pb, start);
if (s->streams[0]->codec->codec_tag != 0x01 /* hence for all other than PCM */
&& s->pb->seekable) {
start_guid(pb, ff_w64_guid_fact, &wav->fact_pos);
avio_wl64(pb, 0);
end_guid(pb, wav->fact_pos);
}
start_guid(pb, ff_w64_guid_data, &wav->data);
return 0;
@ -280,8 +288,18 @@ static int w64_write_trailer(AVFormatContext *s)
file_size = avio_tell(pb);
avio_seek(pb, 16, SEEK_SET);
avio_wl64(pb, file_size);
avio_seek(pb, file_size, SEEK_SET);
if (s->streams[0]->codec->codec_tag != 0x01) {
int64_t number_of_samples;
number_of_samples = av_rescale(wav->maxpts - wav->minpts + wav->last_duration,
s->streams[0]->codec->sample_rate * (int64_t)s->streams[0]->time_base.num,
s->streams[0]->time_base.den);
avio_seek(pb, wav->fact_pos + 24, SEEK_SET);
avio_wl64(pb, number_of_samples);
}
avio_seek(pb, file_size, SEEK_SET);
avio_flush(pb);
}