diff options
author | David Robillard <d@drobilla.net> | 2009-05-04 15:50:51 +0000 |
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committer | David Robillard <d@drobilla.net> | 2009-05-04 15:50:51 +0000 |
commit | ca10cc82a4374a5b413c06ead6cc89c53f8881ee (patch) | |
tree | 3d44716ed02d80bd1256609631c77a730d04e169 /libs/ardour/lv2_event_buffer.cc | |
parent | 9b06b1da0cec57a6848cf1f7920691ae022b30e7 (diff) |
Preliminary MIDI plugin support.
git-svn-id: svn://localhost/ardour2/branches/3.0@5036 d708f5d6-7413-0410-9779-e7cbd77b26cf
Diffstat (limited to 'libs/ardour/lv2_event_buffer.cc')
-rw-r--r-- | libs/ardour/lv2_event_buffer.cc | 191 |
1 files changed, 191 insertions, 0 deletions
diff --git a/libs/ardour/lv2_event_buffer.cc b/libs/ardour/lv2_event_buffer.cc new file mode 100644 index 0000000000..5405701da1 --- /dev/null +++ b/libs/ardour/lv2_event_buffer.cc @@ -0,0 +1,191 @@ +/* + Copyright (C) 2009 Paul Davis + Author: Dave 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. +*/ + +#define __STDC_LIMIT_MACROS 1 +#include <stdint.h> +#include <iostream> +#include "ardour/lv2_event_buffer.h" +#include "lv2ext/lv2_event.h" +#include "lv2ext/lv2_event_helpers.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(); + } + +#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;*/ + + 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 + |