smokephil/ardour
1
0
Fork 0
mirror of https://github.com/Ardour/ardour.git synced 2026-01-04 20:55:48 +01:00
Code Issues Projects Releases Wiki Activity

Optimize Audio-buffer summing

Browse source 
* skip silent buffers
* use vectorized copy
* prefer memset for zero-gain
This commit is contained in:
Robin Gareus 2019-09-22 04:54:28 +02:00
parent a1c48e0a80
commit 0e68d3f742
No known key found for this signature in database
GPG key ID: A090BCE02CF57F04
1 changed files with 23 additions and 5 deletions
Download patch file Download diff file Expand all files Collapse all files

28
libs/ardour/ardour/audio_buffer.h
View file

@ -52,7 +52,7 @@ public:
assert(src != 0);
assert(_capacity > 0);
assert(len <= _capacity);
memcpy(_data + dst_offset, src + src_offset, sizeof(Sample) * len);
copy_vector(_data + dst_offset, src + src_offset, len);
_silent = false;
_written = true;
}
@ -69,7 +69,13 @@ public:
assert(src.type() == DataType::AUDIO);
assert(dst_offset + len <= _capacity);
assert( src_offset <= ((samplecnt_t) src.capacity()-len));
memcpy(_data + dst_offset, ((const AudioBuffer&)src).data() + src_offset, sizeof(Sample) * len);
if (src.silent()) {
memset (_data + dst_offset, 0, sizeof (Sample) * len);
} else {
copy_vector (_data + dst_offset, ((const AudioBuffer&)src).data() + src_offset, len);
}
if (dst_offset == 0 && src_offset == 0 && len == _capacity) {
_silent = src.silent();
} else {
@ -89,7 +95,9 @@ public:
void accumulate_from (const AudioBuffer& src, samplecnt_t len, sampleoffset_t dst_offset = 0, sampleoffset_t src_offset = 0) {
assert(_capacity > 0);
assert(len <= _capacity);
if (src.silent ()) {
return;
}
Sample* const dst_raw = _data + dst_offset;
const Sample* const src_raw = src.data() + src_offset;
@ -116,11 +124,10 @@ public:
/** Accumulate (add) @a len samples @a src starting at @a src_offset into self starting at @dst_offset
* scaling by @a gain_coeff */
void accumulate_with_gain_from (const AudioBuffer& src, samplecnt_t len, gain_t gain_coeff, sampleoffset_t dst_offset = 0, sampleoffset_t src_offset = 0) {
assert(_capacity > 0);
assert(len <= _capacity);
if (src.silent()) {
if (src.silent() || gain_coeff == 0) {
return;
}
@ -155,6 +162,10 @@ public:
assert(_capacity > 0);
assert(len <= _capacity);
if (initial == 0 && target == 0) {
return;
}
Sample* dst = _data + dst_offset;
gain_t gain_delta = (target - initial)/len;
@ -172,6 +183,13 @@ public:
* @param len number of samples to amplify
*/
void apply_gain (gain_t gain, samplecnt_t len) {
if (gain == 0) {
memset (_data, 0, sizeof (Sample) * len);
if (len == _capacity) {
_silent = true;
}
return;
}
apply_gain_to_buffer (_data, len, gain);
}