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DiskReader::overwrite_existing_audio() now only overwrites data that would be read

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There's no need to fill the whole buffer, because we do not consider the whole buffer readable.
This uses the recently-added PlaybackBuffer::overwritable_at() API to compute the correct
amount of data to overwrite
This commit is contained in:
Paul Davis 2020-05-12 11:32:56 -06:00
parent af46adc110
commit 5b7c20453f
1 changed files with 14 additions and 10 deletions
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24
libs/ardour/disk_reader.cc
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@ -687,38 +687,42 @@ DiskReader::overwrite_existing_audio ()
samplecnt_t chunk1_cnt;
samplecnt_t chunk2_cnt;
const samplecnt_t bufsize = c->front ()->rbuf->bufsize ();
const samplecnt_t to_overwrite = c->front()->rbuf->overwritable_at (overwrite_offset);
chunk1_offset = overwrite_offset;
chunk1_cnt = bufsize - overwrite_offset;
chunk1_cnt = min (c->front()->rbuf->bufsize() - overwrite_offset, to_overwrite);
if (chunk1_cnt == bufsize) {
if (chunk1_cnt == to_overwrite) {
chunk1_cnt--;
chunk2_cnt = 0;
} else {
chunk2_cnt = bufsize - 1 - chunk1_cnt;
chunk2_cnt = to_overwrite - chunk1_cnt;
}
/* this is a complete buffer fill */
assert (chunk1_cnt + chunk2_cnt == bufsize - 1);
boost::scoped_array<Sample> mixdown_buffer (new Sample[bufsize]);
boost::scoped_array<float> gain_buffer (new float[bufsize]);
boost::scoped_array<Sample> mixdown_buffer (new Sample[to_overwrite]);
boost::scoped_array<float> gain_buffer (new float[to_overwrite]);
uint32_t n = 0;
bool ret = true;
samplepos_t start;
for (ChannelList::iterator chan = c->begin (); chan != c->end (); ++chan, ++n) {
samplepos_t start = overwrite_sample;
Sample* buf = (*chan)->rbuf->buffer ();
ReaderChannelInfo* rci = dynamic_cast<ReaderChannelInfo*> (*chan);
/* Note that @param start is passed by reference and will be
* updated by the ::audio_read() call
*/
start = overwrite_sample;
if (chunk1_cnt) {
if (audio_read (buf + chunk1_offset, mixdown_buffer.get (), gain_buffer.get (), start, chunk1_cnt, rci, n, reversed) != chunk1_cnt) {
error << string_compose (_("DiskReader %1: when overwriting(1), cannot read %2 from playlist at sample %3"), id (), chunk1_cnt, overwrite_sample) << endmsg;
ret = false;
continue;
}
}
if (chunk2_cnt) {