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Optimize audio region read when no regionFX are used

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This commit is contained in:
Robin Gareus 2024-10-10 02:45:03 +02:00
parent 43dd75b10e
commit 5efa5b4529
Signed by: rgareus
GPG Key ID: A090BCE02CF57F04
1 changed files with 44 additions and 7 deletions
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51
libs/ardour/audioregion.cc
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@ -734,7 +734,8 @@ AudioRegion::read_at (Sample* buf,
boost::scoped_array<gain_t> gain_array;
boost::scoped_array<Sample> mixdown_array;
// TODO optimize mono reader, w/o plugins -> old code
bool nofx = false; // apply region fades at the end
if (n_chn > 1 && _cache_start < _cache_end && internal_offset + suffix >= _cache_start && internal_offset + suffix + can_read <= _cache_end) {
DEBUG_TRACE (DEBUG::AudioPlayback, string_compose ("Region '%1' channel: %2 copy from cache %3 - %4 to_read: %5 can_read: %6\n",
name(), chan_n, internal_offset + suffix, internal_offset + suffix + can_read, to_read, can_read));
@ -747,11 +748,39 @@ AudioRegion::read_at (Sample* buf,
lm.release ();
samplecnt_t n_read = to_read; //< data to read from disk
samplecnt_t n_proc = to_read; //< silence pad data to process
samplepos_t n_tail = 0; // further silence pad, read tail from FX
samplepos_t readat = pos;
sampleoffset_t offset = internal_offset;
/* don't use cache when there are no region FX */
if (!have_fx) {
cl.release ();
if (read_from_sources (_sources, lsamples, mixdown_buffer, pos, n_read, chan_n) != to_read) {
return 0;
}
/* APPLY REGULAR GAIN CURVES AND SCALING TO mixdown_buffer */
if (envelope_active()) {
_envelope->curve().get_vector (timepos_t (offset), timepos_t (offset + n_read), gain_buffer, n_read);
if (_scale_amplitude != 1.0f) {
for (samplecnt_t n = 0; n < n_read; ++n) {
mixdown_buffer[n] *= gain_buffer[n] * _scale_amplitude;
}
} else {
for (samplecnt_t n = 0; n < n_read; ++n) {
mixdown_buffer[n] *= gain_buffer[n];
}
}
} else if (_scale_amplitude != 1.0f) {
apply_gain_to_buffer (mixdown_buffer, n_read, _scale_amplitude);
}
nofx = true;
goto endread;
}
samplecnt_t n_proc = to_read; //< silence pad data to process
samplepos_t n_tail = 0; // further silence pad, read tail from FX
samplepos_t readat = pos;
if (tsamples > 0 && cnt >= esamples) {
n_tail = can_read - n_read;
n_proc += n_tail;
@ -800,7 +829,7 @@ AudioRegion::read_at (Sample* buf,
*/
if (read_from_sources (_sources, lsamples, mixdown_buffer, readat, n_read, chn) != n_read) {
return 0; // XXX
return 0;
}
/* APPLY REGULAR GAIN CURVES AND SCALING TO mixdown_buffer */
@ -908,6 +937,7 @@ AudioRegion::read_at (Sample* buf,
_cache_tail = n_tail;
cl.release ();
}
endread:
/* APPLY FADES TO THE DATA IN mixdown_buffer AND MIX THE RESULTS INTO
* buf. The key things to realize here: (1) the fade being applied is
@ -954,7 +984,7 @@ AudioRegion::read_at (Sample* buf,
_fade_in->curve().get_vector (timepos_t (internal_offset), timepos_t (internal_offset + fade_in_limit), gain_buffer, fade_in_limit);
}
if (!_fade_before_fx) {
if (!_fade_before_fx || nofx) {
/* Mix our newly-read data in, with the fade */
for (samplecnt_t n = 0; n < fade_in_limit; ++n) {
buf[n] += mixdown_buffer[n] * gain_buffer[n];
@ -999,7 +1029,7 @@ AudioRegion::read_at (Sample* buf,
_fade_out->curve().get_vector (timepos_t (curve_offset), timepos_t (curve_offset + fade_out_limit), gain_buffer, fade_out_limit);
}
if (!_fade_before_fx) {
if (!_fade_before_fx || nofx) {
/* Mix our newly-read data with whatever was already there, with the fade out applied to our data. */
for (samplecnt_t n = 0, m = fade_out_offset; n < fade_out_limit; ++n, ++m) {
buf[m] += mixdown_buffer[m] * gain_buffer[n];
@ -2542,6 +2572,13 @@ AudioRegion::remove_plugin (std::shared_ptr<RegionFxPlugin> fx)
}
_plugins.erase (i);
if (_plugins.empty ()) {
Glib::Threads::Mutex::Lock cl (_cache_lock);
_cache_start = _cache_end = -1;
_cache_tail = 0;
_readcache.clear ();
}
lm.release ();
fx->drop_references ();