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Diffstat (limited to 'raul/MIDIRingBuffer.h')
-rw-r--r-- | raul/MIDIRingBuffer.h | 162 |
1 files changed, 162 insertions, 0 deletions
diff --git a/raul/MIDIRingBuffer.h b/raul/MIDIRingBuffer.h new file mode 100644 index 0000000..d054bbc --- /dev/null +++ b/raul/MIDIRingBuffer.h @@ -0,0 +1,162 @@ +/* This file is part of Raul. + * Copyright (C) 2007 Dave Robillard <http://drobilla.net> + * + * Raul 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. + * + * Raul 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 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., + * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#ifndef RAUL_MIDI_RING_BUFFER_H +#define RAUL_MIDI_RING_BUFFER_H + +#include <cassert> +#include <algorithm> +#include <glib.h> +#include <raul/types.h> +#include <raul/RingBuffer.h> + +#include <iostream> + +namespace Raul { + + +/** A MIDI RingBuffer + */ +class MIDIRingBuffer : private Raul::RingBuffer<char> { +public: + + struct MidiEvent { + TickTime time; + size_t size; + unsigned char* buf; + }; + + + /** @param size Size in bytes. + */ + MIDIRingBuffer(size_t size) + : RingBuffer<char>(size) + { + } + + size_t capacity() const { return _size; } + + /** Read one event and appends it to @a out. */ + //size_t read(MidiBuffer& out); + + /** Read events all events up to time @a end into @a out, leaving stamps intact. + * Any events before @a start will be dropped. */ + //size_t read(MidiBuffer& out, TickTime start, TickTime end); + + /** Write one event */ + //size_t write(const MidiEvent& in); // deep copies in + + size_t write(TickTime time, size_t size, const char* buf); + bool read(TickTime* time, size_t* size, char* buf); + +}; + + +bool +MIDIRingBuffer::read(TickTime* time, size_t* size, char* buf) +{ + bool success = RingBuffer<char>::full_read(sizeof(TickTime), (char*)time); + if (success) + success = RingBuffer<char>::full_read(sizeof(size_t), (char*)size); + if (success) + success = RingBuffer<char>::full_read(*size, buf); + + return success; +} + + +inline size_t +MIDIRingBuffer::write(TickTime time, size_t size, const char* buf) +{ + assert(size > 0); + + if (write_space() < (sizeof(TickTime) + sizeof(size_t) + size)) { + return 0; + } else { + RingBuffer<char>::write(sizeof(TickTime), (char*)&time); + RingBuffer<char>::write(sizeof(size_t), (char*)&size); + RingBuffer<char>::write(size, buf); + return size; + } +} + +#if 0 +inline size_t +MIDIRingBuffer::read(MidiBuffer& dst, TickTime start, TickTime end) +{ + if (read_space() == 0) + return 0; + + size_t priv_read_ptr = g_atomic_int_get(&_read_ptr); + TickTime time = _ev_buf[priv_read_ptr].time; + size_t count = 0; + size_t limit = read_space(); + + while (time <= end && limit > 0) { + MidiEvent* const read_ev = &_ev_buf[priv_read_ptr]; + if(time >= start) { + dst.push_back(*read_ev); + //printf("MRB - read %#X %d %d with time %u at index %zu\n", + // read_ev->buffer[0], read_ev->buffer[1], read_ev->buffer[2], read_ev->time, + // priv_read_ptr); + } else { + printf("MRB - SKIPPING - %#X %d %d with time %u at index %zu\n", + read_ev->buffer[0], read_ev->buffer[1], read_ev->buffer[2], read_ev->time, + priv_read_ptr); + break; + } + + clear_event(priv_read_ptr); + + ++count; + --limit; + + priv_read_ptr =(priv_read_ptr + 1) % _size; + + assert(read_ev->time <= end); + time = _ev_buf[priv_read_ptr].time; + } + + g_atomic_int_set(&_read_ptr, priv_read_ptr); + + //printf("(R) read space: %zu\n", read_space()); + + return count; +} + +inline size_t +MIDIRingBuffer::write(const MidiBuffer& in, TickTime time) +{ + const size_t num_events = in.size(); + const size_t to_write = std::min(write_space(), num_events); + + // FIXME: double copy :/ + for (size_t i=0; i < to_write; ++i) { + MidiEvent ev = in[i]; + ev.time += offset; + write(ev); + } + + return to_write; +} +#endif + + +} // namespace Raul + +#endif // RAUL_MIDI_RING_BUFFER_H + |