support backwards reading of MIDI from RTMidiBuffer
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@ -53,6 +53,8 @@ class LIBARDOUR_API RTMidiBuffer : public Evoral::EventSink<samplepos_t>
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uint32_t read (MidiBuffer& dst, samplepos_t start, samplepos_t end, MidiStateTracker& tracker, samplecnt_t offset = 0);
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void dump (uint32_t);
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void reverse ();
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bool reversed() const;
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struct Item {
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samplepos_t timestamp;
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@ -77,7 +79,7 @@ class LIBARDOUR_API RTMidiBuffer : public Evoral::EventSink<samplepos_t>
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size_t _size;
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size_t _capacity;
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Item* _data;
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bool _reversed;
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/* secondary blob storage. Holds Blobs (arbitrary size + data) */
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uint32_t alloc_blob (uint32_t size);
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@ -17,6 +17,7 @@
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*/
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#include <iostream>
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#include <algorithm> // std::reverse
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#include "pbd/malign.h"
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#include "pbd/compose.h"
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@ -39,6 +40,7 @@ RTMidiBuffer::RTMidiBuffer ()
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: _size (0)
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, _capacity (0)
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, _data (0)
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, _reversed (false)
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, _pool_size (0)
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, _pool_capacity (0)
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, _pool (0)
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@ -76,6 +78,78 @@ RTMidiBuffer::resize (size_t size)
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_capacity = size;
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}
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bool
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RTMidiBuffer::reversed () const
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{
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return _reversed;
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}
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void
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RTMidiBuffer::reverse ()
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{
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if (_size == 0) {
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return;
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}
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Item* previous_note_on[16][128];
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uint8_t note_num;
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uint8_t channel;
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int32_t i;
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memset (previous_note_on, 0, sizeof (Item*) * 16 * 128);
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if (_reversed) {
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i = _size - 1;
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} else {
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i = 0;
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}
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/* iterate from start to end, or end-to-start, depending on current
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* _reversed status. Find each note on, and swap it with the relevant
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* note off.
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*/
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while ((_reversed && (i >= 0)) || (!_reversed && (i < (int32_t) _size))) {
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Item* item = &_data[i];
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if (!item->bytes[0]) {
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/* event is 3 bytes or less, so regular MIDI data */
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switch (item->bytes[1] & 0xf0) { /* status byte */
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case MIDI_CMD_NOTE_ON:
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note_num = item->bytes[2];
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channel = item->bytes[1] & 0xf;
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if (!previous_note_on[channel][note_num]) {
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previous_note_on[channel][note_num] = item;
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} else {
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std::cerr << "error: note is already on! ... ignored\n";
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}
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break;
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case MIDI_CMD_NOTE_OFF: /* note off */
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note_num = item->bytes[2];
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channel = item->bytes[1] & 0xf;
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if (previous_note_on[channel][note_num]) {
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swap (item->bytes[1], previous_note_on[channel][note_num]->bytes[1]);
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previous_note_on[channel][note_num] = 0;
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} else {
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std::cerr << "discovered note off without preceding note on... ignored\n";
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}
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break;
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default:
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break;
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}
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}
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if (_reversed) {
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--i;
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} else {
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++i;
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}
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}
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_reversed = !_reversed;
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}
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void
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RTMidiBuffer::dump (uint32_t cnt)
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{
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@ -165,6 +239,13 @@ item_timestamp_earlier (ARDOUR::RTMidiBuffer::Item const & item, samplepos_t tim
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return item.timestamp < time;
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}
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static
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bool
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item_item_earlier (ARDOUR::RTMidiBuffer::Item const & item, ARDOUR::RTMidiBuffer::Item const & other)
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{
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return item.timestamp < other.timestamp;
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}
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uint32_t
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RTMidiBuffer::read (MidiBuffer& dst, samplepos_t start, samplepos_t end, MidiStateTracker& tracker, samplecnt_t offset)
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{
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@ -174,18 +255,38 @@ RTMidiBuffer::read (MidiBuffer& dst, samplepos_t start, samplepos_t end, MidiSta
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return 0;
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}
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Item* iend = _data+_size;
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Item* item = lower_bound (_data, iend, start, item_timestamp_earlier);
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Item* iend;
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Item* item;
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uint32_t count = 0;
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bool reverse;
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if (start < end) {
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iend = _data+_size;
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item = lower_bound (_data, iend, start, item_timestamp_earlier);
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reverse = false;
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} else {
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iend = _data;
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--iend; /* yes, this is technically "illegal" but we will never indirect */
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Item* uend = _data+_size;
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Item foo;
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foo.timestamp = start;
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item = upper_bound (_data, uend, foo, item_item_earlier);
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if (item == uend) {
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--item;
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}
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reverse = true;
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}
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#ifndef NDEBUG
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TimeType unadjusted_time;
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Item* last = iend; --last;
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Item* last = &_data[_size-1];
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#endif
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DEBUG_TRACE (DEBUG::MidiRingBuffer, string_compose ("read from %1 .. %2 .. initial index = %3 (time = %4) (range in list of %7 %5..%6)\n", start, end, item - _data, item->timestamp, _data->timestamp, last->timestamp, _size));
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while ((item < iend) && (item->timestamp < end)) {
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while ((item != iend) && ((reverse && (item->timestamp > end)) || (!reverse && (item->timestamp < end)))) {
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TimeType evtime = item->timestamp;
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@ -196,7 +297,12 @@ RTMidiBuffer::read (MidiBuffer& dst, samplepos_t start, samplepos_t end, MidiSta
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* 'offset' into account.
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*/
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evtime -= start;
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if (reverse) {
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evtime = start - evtime;
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} else {
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evtime -= start;
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}
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evtime += offset;
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uint32_t size;
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@ -227,7 +333,11 @@ RTMidiBuffer::read (MidiBuffer& dst, samplepos_t start, samplepos_t end, MidiSta
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DEBUG_TRACE (DEBUG::MidiRingBuffer, string_compose ("read event sz %1 @ %2 (=> %3 via -%4 +%5\n", size, unadjusted_time, evtime, start, offset));
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tracker.track (addr);
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++item;
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if (reverse) {
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--item;
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} else {
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++item;
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}
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++count;
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}
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