Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
+#include "pbd/compose.h"
+#include "pbd/error.h"
+
+#include "ardour/debug.h"
#include "ardour/midi_ring_buffer.h"
#include "ardour/midi_buffer.h"
#include "ardour/event_type_map.h"
using namespace std;
+using namespace ARDOUR;
+using namespace PBD;
-namespace ARDOUR {
-
-/** Read a block of MIDI events from buffer.
+/** Read a block of MIDI events from this buffer into a MidiBuffer.
*
* Timestamps of events returned are relative to start (i.e. event with stamp 0
* occurred at start), with offset added.
*/
template<typename T>
size_t
-MidiRingBuffer<T>::read(MidiBuffer& dst, nframes_t start, nframes_t end, nframes_t offset)
+MidiRingBuffer<T>::read(MidiBuffer& dst, framepos_t start, framepos_t end, framecnt_t offset, bool stop_on_overflow_in_dst)
{
if (this->read_space() == 0) {
return 0;
Evoral::EventType ev_type;
uint32_t ev_size;
+ /* If we see the end of a loop during this read, we must write the events after it
+ to the MidiBuffer with adjusted times. The situation is as follows:
+
+ session frames----------------------------->
+
+ | | |
+ start_of_loop start end_of_loop
+
+ The MidiDiskstream::read method which will have happened before this checks for
+ loops ending, and helpfully inserts a magic LoopEvent into the ringbuffer. After this,
+ the MidiDiskstream continues to write events with their proper session frame times,
+ so after the LoopEvent event times will go backwards (ie non-monotonically).
+
+ Once we hit end_of_loop, we need to fake it to make it look as though the loop has been
+ immediately repeated. Say that an event E after the end_of_loop in the ringbuffer
+ has time E_t, which is a time in session frames. Its offset from the start
+ of the loop will be E_t - start_of_loop. Its `faked' time will therefore be
+ end_of_loop + E_t - start_of_loop. And so its port-buffer-relative time (for
+ writing to the MidiBuffer) will be end_of_loop + E_t - start_of_loop - start.
+
+ The subtraction of start is already taken care of, so if we see a LoopEvent, we'll
+ set up loop_offset to equal end_of_loop - start_of_loop, so that given an event
+ time E_t in the ringbuffer we can get the port-buffer-relative time as
+ E_t + offset - start.
+ */
+
+ frameoffset_t loop_offset = 0;
+
size_t count = 0;
- //cerr << "MRB read " << start << " .. " << end << " + " << offset << endl;
+ const size_t prefix_size = sizeof(T) + sizeof(Evoral::EventType) + sizeof(uint32_t);
+
+ while (this->read_space() >= prefix_size) {
- while (this->read_space() >= sizeof(T) + sizeof(Evoral::EventType) + sizeof(uint32_t)) {
+ uint8_t peekbuf[prefix_size];
+ bool success;
- this->full_peek(sizeof(T), (uint8_t*)&ev_time);
+ success = this->peek (peekbuf, prefix_size);
+ /* this cannot fail, because we've already verified that there
+ is prefix_space to read
+ */
+ assert (success);
- if (ev_time > end) {
- //cerr << "MRB: PAST END (" << ev_time << " : " << end << ")" << endl;
+ ev_time = *((T*) peekbuf);
+ ev_type = *((Evoral::EventType*)(peekbuf + sizeof (T)));
+ ev_size = *((uint32_t*)(peekbuf + sizeof(T) + sizeof (Evoral::EventType)));
+
+ if (ev_time + loop_offset >= end) {
+ DEBUG_TRACE (DEBUG::MidiDiskstreamIO, string_compose ("MRB event @ %1 past end @ %2\n", ev_time, end));
break;
- } else if (ev_time < start) {
- //cerr << "MRB (start " << start << ") - Skipping event at (too early) time " << ev_time << endl;
+ } else if (ev_time + loop_offset < start) {
+ DEBUG_TRACE (DEBUG::MidiDiskstreamIO, string_compose ("MRB event @ %1 before start @ %2\n", ev_time, start));
break;
+ } else {
+ DEBUG_TRACE (DEBUG::MidiDiskstreamIO, string_compose ("MRB event @ %1 in range %2 .. %3\n", ev_time, start, end));
}
- bool success = read_prefix(&ev_time, &ev_type, &ev_size);
- if (!success) {
- cerr << "WARNING: error reading event prefix from MIDI ring" << endl;
- continue;
- }
+ assert(ev_time >= start);
- // This event marks a loop happening. this means that
- // the next events timestamp will be non-monotonic.
+ ev_time -= start;
+ ev_time += offset;
+
+ // This event marks a loop end (i.e. the next event's timestamp
+ // will be non-monotonic). Don't write it into the buffer - the
+ // significance of this event ends here.
+
if (ev_type == LoopEventType) {
- ev_time -= start;
- ev_time += offset;
- Evoral::MIDIEvent<T> loopevent(LoopEventType, ev_time);
- dst.push_back(loopevent);
-
- // We can safely return, without reading the data, because
- // a LoopEvent does not have data.
- return count + 1;
+ assert (ev_size == sizeof (framepos_t));
+ framepos_t loop_start;
+ read_contents (ev_size, (uint8_t *) &loop_start);
+ loop_offset = ev_time - loop_start;
+ _tracker.resolve_notes (dst, ev_time);
+ continue;
}
+ /* we're good to go ahead and read the data now but since we
+ * have the prefix data already, just skip over that
+ */
+ this->increment_read_ptr (prefix_size);
+ ev_time += loop_offset;
+
uint8_t status;
- success = this->full_peek(sizeof(uint8_t), &status);
+ success = this->peek (&status, sizeof(uint8_t));
assert(success); // If this failed, buffer is corrupt, all hope is lost
// Ignore event if it doesn't match channel filter
if (is_channel_event(status) && get_channel_mode() == FilterChannels) {
const uint8_t channel = status & 0x0F;
- if ( !(get_channel_mask() & (1L << channel)) ) {
- //cerr << "MRB skipping event due to channel mask" << endl;
- this->skip(ev_size); // Advance read pointer to next event
+ if (!(get_channel_mask() & (1L << channel))) {
+ DEBUG_TRACE (DEBUG::MidiDiskstreamIO, string_compose ("MRB skipping event (%3 bytes) due to channel mask (mask = %1 chn = %2)\n",
+ get_channel_mask(), (int) channel, ev_size));
+ this->increment_read_ptr (ev_size); // Advance read pointer to next event
continue;
}
}
- //cerr << "MRB " << this << " - Reading event, time = "
- // << ev_time << " - " << start << " => " << ev_time - start
- // << ", size = " << ev_size << endl;
-
- assert(ev_time >= start);
- ev_time -= start;
- ev_time += offset;
-
- // write the timestamp to address (write_loc - 1)
- uint8_t* write_loc = dst.reserve(ev_time, ev_size);
- if (write_loc == NULL) {
- cerr << "MRB: Unable to reserve space in buffer, event skipped";
+ /* lets see if we are going to be able to write this event into dst.
+ */
+ uint8_t* write_loc = dst.reserve (ev_time, ev_size);
+ if (write_loc == 0) {
+ if (stop_on_overflow_in_dst) {
+ DEBUG_TRACE (DEBUG::MidiDiskstreamIO, string_compose ("MidiRingBuffer: overflow in destination MIDI buffer, stopped after %1 events\n", count));
+ break;
+ }
+ error << "MRB: Unable to reserve space in buffer, event skipped" << endmsg;
+ this->increment_read_ptr (ev_size); // Advance read pointer to next event
continue;
}
-
+
// write MIDI buffer contents
- success = Evoral::EventRingBuffer<T>::full_read(ev_size, write_loc);
-
- /*cerr << "wrote MidiEvent to Buffer: ";
- for (size_t i=0; i < ev_size; ++i) {
- printf("%X ", write_loc[i]);
+ success = read_contents (ev_size, write_loc);
+
+#ifndef NDEBUG
+ if (DEBUG::MidiDiskstreamIO && PBD::debug_bits) {
+ DEBUG_STR_DECL(a);
+ DEBUG_STR_APPEND(a, string_compose ("wrote MidiEvent to Buffer (time=%1, start=%2 offset=%3)", ev_time, start, offset));
+ for (size_t i=0; i < ev_size; ++i) {
+ DEBUG_STR_APPEND(a,hex);
+ DEBUG_STR_APPEND(a,"0x");
+ DEBUG_STR_APPEND(a,(int)write_loc[i]);
+ DEBUG_STR_APPEND(a,' ');
+ }
+ DEBUG_STR_APPEND(a,'\n');
+ DEBUG_TRACE (DEBUG::MidiDiskstreamIO, DEBUG_STR(a).str());
}
- printf("\n");*/
+#endif
if (success) {
+
+ if (is_note_on(write_loc[0]) ) {
+ _tracker.add (write_loc[1], write_loc[0] & 0xf);
+ } else if (is_note_off(write_loc[0])) {
+ _tracker.remove (write_loc[1], write_loc[0] & 0xf);
+ }
+
if (is_channel_event(status) && get_channel_mode() == ForceChannel) {
write_loc[0] = (write_loc[0] & 0xF0) | (get_channel_mask() & 0x0F);
}
++count;
- //cerr << "MRB - read event at time " << ev_time << endl;
} else {
cerr << "WARNING: error reading event contents from MIDI ring" << endl;
}
}
-
- //cerr << "MTB read space: " << read_space() << endl;
return count;
}
-template class MidiRingBuffer<double>;
+template<typename T>
+void
+MidiRingBuffer<T>::dump(ostream& str)
+{
+ size_t rspace;
+
+ if ((rspace = this->read_space()) == 0) {
+ str << "MRB::dump: empty\n";
+ return;
+ }
+
+ T ev_time;
+ Evoral::EventType ev_type;
+ uint32_t ev_size;
+
+ RingBufferNPT<uint8_t>::rw_vector vec;
+ RingBufferNPT<uint8_t>::get_read_vector (&vec);
+
+ if (vec.len[0] == 0) {
+ return;
+ }
+
+ str << this << ": Dump size = " << vec.len[0] + vec.len[1]
+ << " r@ " << RingBufferNPT<uint8_t>::get_read_ptr()
+ << " w@" << RingBufferNPT<uint8_t>::get_write_ptr() << endl;
+
+
+ uint8_t *buf = new uint8_t[vec.len[0] + vec.len[1]];
+ memcpy (buf, vec.buf[0], vec.len[0]);
+
+ if (vec.len[1]) {
+ memcpy (buf+vec.len[1], vec.buf[1], vec.len[1]);
+ }
+
+ uint8_t* data = buf;
+ const uint8_t* end = buf + vec.len[0] + vec.len[1];
+
+ while (data < end) {
+
+ memcpy (&ev_time, data, sizeof (T));
+ data += sizeof (T);
+ str << "\ttime " << ev_time;
+
+ if (data >= end) {
+ str << "(incomplete)\n ";
+ break;
+ }
+
+ memcpy (&ev_type, data, sizeof (ev_type));
+ data += sizeof (ev_type);
+ str << " type " << ev_type;
+
+ if (data >= end) {
+ str << "(incomplete)\n";
+ break;
+ }
+
+ memcpy (&ev_size, data, sizeof (ev_size));
+ data += sizeof (ev_size);
+ str << " size " << ev_size;
+
+ if (data >= end) {
+ str << "(incomplete)\n";
+ break;
+ }
+
+ for (uint32_t i = 0; i != ev_size && data < end; ++i) {
+ str << ' ' << hex << (int) data[i] << dec;
+ }
+
+ data += ev_size;
+
+ str << endl;
+ }
+
+ delete [] buf;
+}
+
+template<typename T>
+void
+MidiRingBuffer<T>::reset_tracker ()
+{
+ _tracker.reset ();
+}
-} // namespace ARDOUR
+template class MidiRingBuffer<framepos_t>;
projects / ardour.git / blobdiff