Midi CC automation sending (send points only, no linear interpolation yet).

Split buffer.cc into buffer.cc audio_buffer.cc midi_buffer.cc.
Renamed 'send_buffers' to 'mix_buffers'.
This is the first revision of Ardour where clicking around and drawing things can send MIDI and thus generate wonderful world-changing music.  Break out the champagne.


git-svn-id: svn://localhost/ardour2/trunk@2115 d708f5d6-7413-0410-9779-e7cbd77b26cf

1 files changed, 255 insertions, 0 deletions

diff --git a/libs/ardour/midi_buffer.cc b/libs/ardour/midi_buffer.cc
new file mode 100644
index 0000000000..5376886a5d
--- /dev/null
+++ b/libs/ardour/midi_buffer.cc
@@ -0,0 +1,255 @@
+/*
+    Copyright (C) 2006-2007 Paul Davis 
+	Author: Dave Robillard
+    
+    This program is free software; you can redistribute it and/or modify it
+    under the terms of the GNU General Public License as published by the Free
+    Software Foundation; either version 2 of the License, or (at your option)
+    any later version.
+    
+    This program is distributed in the hope that it will be useful, but WITHOUT
+    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+    for more details.
+    
+    You should have received a copy of the GNU General Public License along
+    with this program; if not, write to the Free Software Foundation, Inc.,
+    675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#include <iostream>
+#include <ardour/midi_buffer.h>
+
+#ifdef __x86_64__
+static const int CPU_CACHE_ALIGN = 64;
+#else
+static const int CPU_CACHE_ALIGN = 16; /* arguably 32 on most arches, but it matters less */
+#endif
+
+using namespace std;
+
+namespace ARDOUR {
+
+
+// FIXME: mirroring for MIDI buffers?
+MidiBuffer::MidiBuffer(size_t capacity)
+	: Buffer(DataType::MIDI, capacity)
+//	, _owns_data(true)
+	, _events(NULL)
+	, _data(NULL)
+{
+	assert(capacity > 0);
+
+	_size = 0;
+
+#ifdef NO_POSIX_MEMALIGN
+	_events = (MidiEvent *) malloc(sizeof(MidiEvent) * capacity);
+	_data = (Byte *) malloc(sizeof(Byte) * capacity * MAX_EVENT_SIZE);
+#else
+	posix_memalign((void**)&_events, CPU_CACHE_ALIGN, sizeof(MidiEvent) * capacity);
+	posix_memalign((void**)&_data, CPU_CACHE_ALIGN, sizeof(Byte) * capacity * MAX_EVENT_SIZE);
+#endif	
+	assert(_data);
+	assert(_events);
+	silence(_capacity);
+}
+
+void
+MidiBuffer::copy(const MidiBuffer& copy)
+{
+	assert(_capacity >= copy._capacity);
+	_size = 0;
+
+	for (size_t i=0; i < copy.size(); ++i)
+		push_back(copy[i]);
+}
+
+MidiBuffer::~MidiBuffer()
+{
+	free(_events);
+	free(_data);
+}
+
+
+/** Read events from @a src starting at time @a offset into the START of this buffer, for
+ * time direction @a nframes.  Relative time, where 0 = start of buffer.
+ *
+ * Note that offset and nframes refer to sample time, NOT buffer offsets or event counts.
+ */
+void
+MidiBuffer::read_from(const Buffer& src, nframes_t nframes, nframes_t offset)
+{
+	assert(src.type() == DataType::MIDI);
+	const MidiBuffer& msrc = (MidiBuffer&)src;
+
+	assert(_capacity >= src.size());
+
+	clear();
+	assert(_size == 0);
+
+	// FIXME: slow
+	for (size_t i=0; i < src.size(); ++i) {
+		const MidiEvent& ev = msrc[i];
+		if (ev.time >= offset && ev.time < offset+nframes) {
+			push_back(ev);
+		}
+	}
+
+	_silent = src.silent();
+}
+
+
+/** Push an event into the buffer.
+ *
+ * Note that the raw MIDI pointed to by ev will be COPIED and unmodified.
+ * That is, the caller still owns it, if it needs freeing it's Not My Problem(TM).
+ * Realtime safe.
+ * @return false if operation failed (not enough room)
+ */
+bool
+MidiBuffer::push_back(const MidiEvent& ev)
+{
+	if (_size == _capacity)
+		return false;
+
+	Byte* const write_loc = _data + (_size * MAX_EVENT_SIZE);
+
+	memcpy(write_loc, ev.buffer, ev.size);
+	_events[_size] = ev;
+	_events[_size].buffer = write_loc;
+	++_size;
+
+	//cerr << "MidiBuffer: pushed, size = " << _size << endl;
+
+	_silent = false;
+
+	return true;
+}
+
+
+/** Push an event into the buffer.
+ *
+ * Note that the raw MIDI pointed to by ev will be COPIED and unmodified.
+ * That is, the caller still owns it, if it needs freeing it's Not My Problem(TM).
+ * Realtime safe.
+ * @return false if operation failed (not enough room)
+ */
+bool
+MidiBuffer::push_back(const jack_midi_event_t& ev)
+{
+	if (_size == _capacity)
+		return false;
+
+	Byte* const write_loc = _data + (_size * MAX_EVENT_SIZE);
+
+	memcpy(write_loc, ev.buffer, ev.size);
+	_events[_size].time = (double)ev.time;
+	_events[_size].size = ev.size;
+	_events[_size].buffer = write_loc;
+	++_size;
+
+	//cerr << "MidiBuffer: pushed, size = " << _size << endl;
+
+	_silent = false;
+
+	return true;
+}
+
+
+/** Reserve space for a new event in the buffer.
+ *
+ * This call is for copying MIDI directly into the buffer, the data location
+ * (of sufficient size to write \a size bytes) is returned, or NULL on failure.
+ * This call MUST be immediately followed by a write to the returned data
+ * location, or the buffer will be corrupted and very nasty things will happen.
+ */
+Byte*
+MidiBuffer::reserve(double time, size_t size)
+{
+	assert(size < MAX_EVENT_SIZE);
+
+	if (_size == _capacity)
+		return NULL;
+
+	Byte* const write_loc = _data + (_size * MAX_EVENT_SIZE);
+
+	_events[_size].time = time;
+	_events[_size].size = size;
+	_events[_size].buffer = write_loc;
+	++_size;
+
+	//cerr << "MidiBuffer: reserved, size = " << _size << endl;
+
+	_silent = false;
+
+	return write_loc;
+}
+
+
+void
+MidiBuffer::silence(nframes_t dur, nframes_t offset)
+{
+	// FIXME use parameters
+	assert(offset == 0);
+	//assert(dur == _capacity);
+
+	memset(_events, 0, sizeof(MidiEvent) * _capacity);
+	memset(_data, 0, sizeof(Byte) * _capacity * MAX_EVENT_SIZE);
+	_size = 0;
+	_silent = true;
+}
+
+
+/** Clear, and merge \a a and \a b into this buffer.
+ *
+ * FIXME: This is slow.
+ *
+ * \return true if complete merge was successful
+ */
+bool
+MidiBuffer::merge(const MidiBuffer& a, const MidiBuffer& b)
+{
+	_size = 0;
+
+	// Die if a merge isn't necessary as it's expensive
+	assert(a.size() > 0 && b.size() > 0);
+
+	size_t a_index = 0;
+	size_t b_index = 0;
+	size_t count = a.size() + b.size();
+
+	while (count > 0 && a_index < a.size() && b_index < b.size()) {
+		
+		if (size() == capacity()) {
+			cerr << "WARNING: MIDI buffer overrun, events lost!" << endl;
+			return false;
+		}
+		
+		if (a_index == a.size()) {
+			push_back(a[a_index]);
+			++a_index;
+		} else if (b_index == b.size()) {
+			push_back(b[b_index]);
+			++b_index;
+		} else {
+			const MidiEvent& a_ev = a[a_index];
+			const MidiEvent& b_ev = b[b_index];
+
+			if (a_ev.time <= b_ev.time) {
+				push_back(a_ev);
+				++a_index;
+			} else {
+				push_back(b_ev);
+				++b_index;
+			}
+		}
+
+		--count;
+	}
+
+	return true;
+}
+
+
+} // namespace ARDOUR
+