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/*
Copyright (C) 2009 Paul Davis
Author: David 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 <stdint.h>
#include <iostream>
#include "lv2/lv2plug.in/ns/ext/event/event.h"
#include "lv2/lv2plug.in/ns/ext/event/event-helpers.h"
#include "ardour/lv2_event_buffer.h"
using namespace std;
namespace ARDOUR {
/** Allocate a new event buffer.
* \a capacity is in bytes (not number of events).
*/
LV2EventBuffer::LV2EventBuffer(size_t capacity)
: _latest_frames(0)
, _latest_subframes(0)
{
if (capacity > UINT32_MAX) {
cerr << "Event buffer size " << capacity << " too large, aborting." << endl;
throw std::bad_alloc();
}
if (capacity == 0) {
cerr << "ERROR: LV2 event buffer of size 0 created." << endl;
capacity = 1024;
}
#ifdef NO_POSIX_MEMALIGN
_data = (LV2_Event_Buffer*)malloc(sizeof(LV2_Event_Buffer) + capacity);
int ret = (_data != NULL) ? 0 : -1;
#else
int ret = posix_memalign((void**)&_data, 16, sizeof(LV2_Event_Buffer) + capacity);
#endif
if (ret != 0) {
cerr << "Failed to allocate event buffer. Aborting." << endl;
exit(EXIT_FAILURE);
}
_data->event_count = 0;
_data->capacity = (uint32_t)capacity;
_data->size = 0;
_data->data = reinterpret_cast<uint8_t*>(_data + 1);
reset();
}
LV2EventBuffer::~LV2EventBuffer()
{
free(_data);
}
/** Increment the read position by one event.
*
* \return true if increment was successful, or false if end of buffer reached.
*/
bool
LV2EventBuffer::increment() const
{
if (lv2_event_is_valid(&_iter)) {
lv2_event_increment(&_iter);
return true;
} else {
return false;
}
}
/** \return true iff the cursor is valid (ie get_event is safe)
*/
bool
LV2EventBuffer::is_valid() const
{
return lv2_event_is_valid(&_iter);
}
/** Read an event from the current position in the buffer
*
* \return true if read was successful, or false if end of buffer reached
*/
bool
LV2EventBuffer::get_event(uint32_t* frames,
uint32_t* subframes,
uint16_t* type,
uint16_t* size,
uint8_t** data) const
{
if (lv2_event_is_valid(&_iter)) {
LV2_Event* ev = lv2_event_get(&_iter, data);
*frames = ev->frames;
*subframes = ev->subframes;
*type = ev->type;
*size = ev->size;
return true;
} else {
return false;
}
}
/** Append an event to the buffer.
*
* \a timestamp must be >= the latest event in the buffer.
*
* \return true on success
*/
bool
LV2EventBuffer::append(uint32_t frames,
uint32_t subframes,
uint16_t type,
uint16_t size,
const uint8_t* data)
{
#ifndef NDEBUG
if (lv2_event_is_valid(&_iter)) {
LV2_Event* last_event = lv2_event_get(&_iter, NULL);
assert(last_event->frames < frames
|| (last_event->frames == frames && last_event->subframes <= subframes));
}
#endif
/*cout << "Appending event type " << type << ", size " << size
<< " @ " << frames << "." << subframes << endl;
cout << "Buffer capacity " << _data->capacity << ", size " << _data->size << endl;*/
if (!lv2_event_write(&_iter, frames, subframes, type, size, data)) {
cerr << "ERROR: Failed to write event." << endl;
return false;
} else {
_latest_frames = frames;
_latest_subframes = subframes;
return true;
}
}
/** Append a buffer of events to the buffer.
*
* \a timestamp must be >= the latest event in the buffer.
*
* \return true on success
*/
bool
LV2EventBuffer::append(const LV2_Event_Buffer* /*buf*/)
{
uint8_t** data = NULL;
bool ret = true;
LV2_Event_Iterator iter;
for (lv2_event_begin(&iter, _data); lv2_event_is_valid(&iter); lv2_event_increment(&iter)) {
LV2_Event* ev = lv2_event_get(&iter, data);
#ifndef NDEBUG
assert((ev->frames > _latest_frames)
|| (ev->frames == _latest_frames
&& ev->subframes >= _latest_subframes));
#endif
if (!(ret = append(ev->frames, ev->subframes, ev->type, ev->size, *data))) {
cerr << "ERROR: Failed to write event." << endl;
break;
}
_latest_frames = ev->frames;
_latest_subframes = ev->subframes;
}
return ret;
}
} // namespace ARDOUR
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