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apetag: do not require seekable output

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Also don't write empty tags.

Signed-off-by: Paul B Mahol <onemda@gmail.com>
This commit is contained in:
Paul B Mahol 2013-06-06 13:35:49 +00:00
parent 7fff3df6b2
commit a75d2a6505
1 changed files with 31 additions and 27 deletions
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58
libavformat/apetag.c
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@ -179,24 +179,17 @@ static int string_is_ascii(const uint8_t *str)
int ff_ape_write_tag(AVFormatContext *s)
{
AVDictionaryEntry *e = NULL;
int64_t start, end;
int size, count = 0;
int size, ret, count = 0;
AVIOContext *dyn_bc = NULL;
uint8_t *dyn_buf = NULL;
if (!s->pb->seekable)
return 0;
start = avio_tell(s->pb);
// header
avio_write(s->pb, "APETAGEX", 8); // id
avio_wl32 (s->pb, APE_TAG_VERSION); // version
avio_wl32(s->pb, 0); // reserve space for size
avio_wl32(s->pb, 0); // reserve space for tag count
if ((ret = avio_open_dyn_buf(&dyn_bc)) < 0)
goto end;
// flags
avio_wl32(s->pb, APE_TAG_FLAG_CONTAINS_HEADER | APE_TAG_FLAG_CONTAINS_FOOTER |
avio_wl32(dyn_bc, APE_TAG_FLAG_CONTAINS_HEADER | APE_TAG_FLAG_CONTAINS_FOOTER |
APE_TAG_FLAG_IS_HEADER);
ffio_fill(s->pb, 0, 8); // reserved
ffio_fill(dyn_bc, 0, 8); // reserved
while ((e = av_dict_get(s->metadata, "", e, AV_DICT_IGNORE_SUFFIX))) {
int val_len;
@ -207,18 +200,31 @@ int ff_ape_write_tag(AVFormatContext *s)
}
val_len = strlen(e->value);
avio_wl32(s->pb, val_len); // value length
avio_wl32(s->pb, 0); // item flags
avio_put_str(s->pb, e->key); // key
avio_write(s->pb, e->value, val_len); // value
avio_wl32(dyn_bc, val_len); // value length
avio_wl32(dyn_bc, 0); // item flags
avio_put_str(dyn_bc, e->key); // key
avio_write(dyn_bc, e->value, val_len); // value
count++;
}
if (!count)
goto end;
size = avio_tell(s->pb) - start;
size = avio_close_dyn_buf(dyn_bc, &dyn_buf);
if (size <= 0)
goto end;
size += 20;
// header
avio_write(s->pb, "APETAGEX", 8); // id
avio_wl32(s->pb, APE_TAG_VERSION); // version
avio_wl32(s->pb, size);
avio_wl32(s->pb, count);
avio_write(s->pb, dyn_buf, size - 20);
// footer
avio_write(s->pb, "APETAGEX", 8); // id
avio_wl32 (s->pb, APE_TAG_VERSION); // version
avio_wl32(s->pb, APE_TAG_VERSION); // version
avio_wl32(s->pb, size); // size
avio_wl32(s->pb, count); // tag count
@ -226,12 +232,10 @@ int ff_ape_write_tag(AVFormatContext *s)
avio_wl32(s->pb, APE_TAG_FLAG_CONTAINS_HEADER | APE_TAG_FLAG_CONTAINS_FOOTER);
ffio_fill(s->pb, 0, 8); // reserved
// update values in the header
end = avio_tell(s->pb);
avio_seek(s->pb, start + 12, SEEK_SET);
avio_wl32(s->pb, size);
avio_wl32(s->pb, count);
avio_seek(s->pb, end, SEEK_SET);
end:
if (dyn_bc && !dyn_buf)
avio_close_dyn_buf(dyn_bc, &dyn_buf);
av_freep(&dyn_buf);
return 0;
return ret;
}