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meta/ogg_vorbis: Support LOOPMS tags

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Teach the Ogg Vorbis parser to interpret the value from LOOPMS tags as a
loop start position, measured in milliseconds (instead of the typical
samples). Converting this value to samples requires the sample rate, so
we must now read the sample rate before interpreting the tags.

These tags are used in Sonic Robo Blast 2 (as of v2.2.6).
This commit is contained in:
Francis Gagné 2020-09-09 23:22:05 -04:00
parent 414aa219c8
commit 07f9b7ea66
1 changed files with 9 additions and 2 deletions
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11
src/meta/ogg_vorbis.c
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@ -431,6 +431,9 @@ VGMSTREAM * init_vgmstream_ogg_vorbis_callbacks(STREAMFILE *streamFile, ov_callb
data = init_ogg_vorbis(streamFile, start, stream_size, &io);
if (!data) goto fail;
ogg_vorbis_get_info(data, &channels, &sample_rate);
ogg_vorbis_get_samples(data, &num_samples); /* let libvorbisfile find total samples */
/* search for loop comments */
{//todo ignore if loop flag already set?
const char * comment = NULL;
@ -514,6 +517,12 @@ VGMSTREAM * init_vgmstream_ogg_vorbis_callbacks(STREAMFILE *streamFile, ov_callb
loop_end_found = 1;
}
}
else if (strstr(comment,"LOOPMS=") == comment) { /* Sonic Robo Blast 2 */
/* Convert from milliseconds to samples. */
/* (x ms) * (y samples/s) / (1000 ms/s) */
loop_start = atol(strrchr(comment,'=')+1) * sample_rate / 1000;
loop_flag = (loop_start >= 0);
}
/* Hatsune Miku Project DIVA games, though only 'Arcade Future Tone' has >4ch files
* ENCODER tag is common but ogg_vorbis_encode looks unique enough
@ -531,8 +540,6 @@ VGMSTREAM * init_vgmstream_ogg_vorbis_callbacks(STREAMFILE *streamFile, ov_callb
}
ogg_vorbis_set_disable_reordering(data, disable_reordering);
ogg_vorbis_get_info(data, &channels, &sample_rate);
ogg_vorbis_get_samples(data, &num_samples); /* let libvorbisfile find total samples */
/* build the VGMSTREAM */