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stream_cdda: fix bugs in chapter time retrieval 

Looks like a bunch of off-by-one errors.

The track number was mistakenly offset by 1 - this shifted all chapters
by one, and make the first chapter start on the second track (so the
"chapter" property returned -1 in the first track since it was before
the first chapter).

Also, the calculation of the sector destination was messed up. This
comes from commit 32d818f0, where I apparently attempted to calculate
the position to one byte before the section, but unfortunately math
doesn't work this way and it was nonsense. Just drop this idea; while it
may help with seeking (probably...), it also returns slightly different
times. The user shall use hr-seeks if accurate seeking is required.

Hopefully fixes #1560.
This commit is contained in:
wm4 2015-02-04 15:17:49 +01:00
parent b715fb6df1
commit 5bce4664be
1 changed files with 2 additions and 2 deletions
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4
stream/stream_cdda.c
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@ -257,11 +257,11 @@ static int control(stream_t *stream, int cmd, void *arg)
int track = *(double *)arg;
int start_track = get_track_by_sector(p, p->start_sector);
int end_track = get_track_by_sector(p, p->end_sector);
track += start_track + 1;
track += start_track;
if (track > end_track)
return STREAM_ERROR;
int64_t sector = p->cd->disc_toc[track].dwStartSector;
int64_t pos = sector * (CDIO_CD_FRAMESIZE_RAW + 1) - 1;
int64_t pos = sector * CDIO_CD_FRAMESIZE_RAW;
// Assume standard audio CD: 44.1khz, 2 channels, s16 samples
*(double *)arg = pos / (44100.0 * 2 * 2);
return STREAM_OK;