5a48f99f72
Use iterator interface of Sequence to read events in a MIDISource rather than Sequence::read, avoiding timestamp confusion. Disable no longer useful Sequence::read. git-svn-id: svn://localhost/ardour2/branches/3.0@4570 d708f5d6-7413-0410-9779-e7cbd77b26cf
137 lines
4.0 KiB
C++
137 lines
4.0 KiB
C++
/*
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Copyright (C) 2006-2008 Paul Davis
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "ardour/midi_ring_buffer.h"
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#include "ardour/midi_buffer.h"
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#include "ardour/event_type_map.h"
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using namespace std;
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namespace ARDOUR {
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/** Read a block of MIDI events from buffer.
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*
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* Timestamps of events returned are relative to start (i.e. event with stamp 0
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* occurred at start), with offset added.
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*/
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template<typename T>
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size_t
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MidiRingBuffer<T>::read(MidiBuffer& dst, nframes_t start, nframes_t end, nframes_t offset)
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{
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if (this->read_space() == 0) {
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return 0;
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}
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T ev_time;
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Evoral::EventType ev_type;
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uint32_t ev_size;
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size_t count = 0;
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//cerr << "MRB read " << start << " .. " << end << " + " << offset << endl;
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while (this->read_space() >= sizeof(T) + sizeof(Evoral::EventType) + sizeof(uint32_t)) {
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this->full_peek(sizeof(T), (uint8_t*)&ev_time);
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if (ev_time > end) {
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//cerr << "MRB: PAST END (" << ev_time << " : " << end << ")" << endl;
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break;
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} else if (ev_time < start) {
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//cerr << "MRB (start " << start << ") - Skipping event at (too early) time " << ev_time << endl;
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break;
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}
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bool success = read_prefix(&ev_time, &ev_type, &ev_size);
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if (!success) {
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cerr << "WARNING: error reading event prefix from MIDI ring" << endl;
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continue;
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}
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// This event marks a loop happening. this means that
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// the next events timestamp will be non-monotonic.
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if (ev_type == LoopEventType) {
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ev_time -= start;
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ev_time += offset;
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Evoral::MIDIEvent<T> loopevent(LoopEventType, ev_time);
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dst.push_back(loopevent);
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// We can safely return, without reading the data, because
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// a LoopEvent does not have data.
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return count + 1;
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}
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uint8_t status;
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success = this->full_peek(sizeof(uint8_t), &status);
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assert(success); // If this failed, buffer is corrupt, all hope is lost
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// Ignore event if it doesn't match channel filter
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if (is_channel_event(status) && get_channel_mode() == FilterChannels) {
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const uint8_t channel = status & 0x0F;
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if ( !(get_channel_mask() & (1L << channel)) ) {
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//cerr << "MRB skipping event due to channel mask" << endl;
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this->skip(ev_size); // Advance read pointer to next event
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continue;
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}
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}
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//cerr << "MRB " << this << " - Reading event, time = "
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// << ev_time << " - " << start << " => " << ev_time - start
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// << ", size = " << ev_size << endl;
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assert(ev_time >= start);
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ev_time -= start;
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ev_time += offset;
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// write the timestamp to address (write_loc - 1)
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uint8_t* write_loc = dst.reserve(ev_time, ev_size);
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if (write_loc == NULL) {
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cerr << "MRB: Unable to reserve space in buffer, event skipped";
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continue;
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}
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// write MIDI buffer contents
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success = Evoral::EventRingBuffer<T>::full_read(ev_size, write_loc);
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/*cerr << "wrote MidiEvent to Buffer: ";
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for (size_t i=0; i < ev_size; ++i) {
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printf("%X ", write_loc[i]);
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}
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printf("\n");*/
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if (success) {
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if (is_channel_event(status) && get_channel_mode() == ForceChannel) {
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write_loc[0] = (write_loc[0] & 0xF0) | (get_channel_mask() & 0x0F);
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}
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++count;
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//cerr << "MRB - read event at time " << ev_time << endl;
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} else {
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cerr << "WARNING: error reading event contents from MIDI ring" << endl;
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}
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}
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//cerr << "MTB read space: " << read_space() << endl;
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return count;
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}
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template class MidiRingBuffer<nframes_t>;
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} // namespace ARDOUR
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