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generalize MidiRegion::render() to provide MidiRegion::render_range()

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This commit is contained in:
Paul Davis 2021-10-25 13:30:26 -06:00
parent f5fb65a3f8
commit 54f5c65f02
2 changed files with 23 additions and 4 deletions
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7
libs/ardour/ardour/midi_region.h
View File

@ -109,6 +109,13 @@ class LIBARDOUR_API MidiRegion : public Region
NoteMode mode,
MidiChannelFilter* filter) const;
int render_range (Evoral::EventSink<samplepos_t>& dst,
uint32_t chan_n,
NoteMode mode,
timepos_t const & read_start,
timecnt_t const & read_length,
MidiChannelFilter* filter) const;
protected:
virtual bool can_trim_start_before_source_start () const {

20
libs/ardour/midi_region.cc
View File

@ -277,12 +277,22 @@ MidiRegion::_read_at (const SourceList& /*srcs*/,
return to_read;
}
int
MidiRegion::render (Evoral::EventSink<samplepos_t>& dst,
uint32_t chan_n,
NoteMode mode,
MidiChannelFilter* filter) const
{
return render_range (dst, chan_n, mode, this->start(), _length, filter);
}
int
MidiRegion::render_range (Evoral::EventSink<samplepos_t>& dst,
uint32_t chan_n,
NoteMode mode,
timepos_t const & read_start,
timecnt_t const & read_length,
MidiChannelFilter* filter) const
{
timecnt_t internal_offset;
@ -304,6 +314,8 @@ MidiRegion::render (Evoral::EventSink<samplepos_t>& dst,
internal_offset = timecnt_t (-position());
}
cerr << "RENDER , iffoset " << internal_offset << endl;
if (internal_offset >= _length) {
return 0; /* read nothing */
}
@ -336,8 +348,8 @@ MidiRegion::render (Evoral::EventSink<samplepos_t>& dst,
lm, // source lock
dst, // destination buffer
this->source_position(), // start position of the source in session samples
this->start() + internal_offset, // where to start reading in the source
_length, // length to read
read_start + internal_offset,
read_length,
0,
cursor,
&tracker,
@ -348,7 +360,7 @@ MidiRegion::render (Evoral::EventSink<samplepos_t>& dst,
* Note-Off's get inserted at the end of the region
*/
const timepos_t end = source_position() + start() + internal_offset + length();
const timepos_t end = source_position() + read_start + internal_offset + read_length;
tracker.resolve_notes (dst, end.samples());
return 0;