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movies: fix for loading unseekable ogg vorbis files

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Now, compressed/encrypted ogg files will properly be detected as unseekable, and will still be able to be played.
This commit is contained in:
rdb 2019-04-28 22:57:06 +02:00
parent ca5b4e7b54
commit 00b3fbdb1a
1 changed files with 16 additions and 0 deletions
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16
panda/src/movies/vorbisAudioCursor.cxx
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@ -199,6 +199,22 @@ cb_seek_func(void *datasource, ogg_int64_t offset, int whence) {
break;
case SEEK_CUR:
// Vorbis uses a seek with offset 0 to determine whether seeking is
// supported, but this is not good enough. We seek to the end and back.
if (offset == 0) {
std::streambuf *buf = stream->rdbuf();
std::streampos pos = buf->pubseekoff(0, std::ios::cur, std::ios::in);
if (pos < 0) {
return -1;
}
if (buf->pubseekoff(0, std::ios::end, std::ios::in) >= 0) {
// It worked; seek back to the previous location.
buf->pubseekpos(pos, std::ios::in);
return 0;
} else {
return -1;
}
}
stream->seekg(offset, std::ios::cur);
break;