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Diffstat (limited to 'src/server/EventBuffer.cpp')
| -rw-r--r-- | src/server/EventBuffer.cpp | 215 |
1 files changed, 215 insertions, 0 deletions
diff --git a/src/server/EventBuffer.cpp b/src/server/EventBuffer.cpp new file mode 100644 index 00000000..1e8713ba --- /dev/null +++ b/src/server/EventBuffer.cpp @@ -0,0 +1,215 @@ +/* This file is part of Ingen. + * Copyright 2007-2011 David Robillard <http://drobilla.net> + * + * Ingen 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. + * + * Ingen 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 + */ + +#define __STDC_LIMIT_MACROS 1 +#include <stdint.h> +#include "raul/log.hpp" +#include "lv2/lv2plug.in/ns/ext/event/event.h" +#include "lv2/lv2plug.in/ns/ext/event/event-helpers.h" +#include "ingen-config.h" +#include "EventBuffer.hpp" +#include "ProcessContext.hpp" + +using namespace std; +using namespace Raul; + +namespace Ingen { +namespace Server { + +/** Allocate a new event buffer. + * \a capacity is in bytes (not number of events). + */ +EventBuffer::EventBuffer(BufferFactory& bufs, size_t capacity) + : Buffer(bufs, PortType(PortType::EVENTS), capacity) + , _latest_frames(0) + , _latest_subframes(0) +{ + if (capacity > UINT32_MAX) { + error << "Event buffer size " << capacity << " too large, aborting." << endl; + throw std::bad_alloc(); + } + +#ifdef HAVE_POSIX_MEMALIGN + int ret = posix_memalign((void**)&_data, 16, sizeof(LV2_Event_Buffer) + capacity); +#else + _data = (LV2_Event_Buffer*)malloc(sizeof(LV2_Event_Buffer) + capacity); + int ret = (_data != NULL) ? 0 : -1; +#endif + + if (ret != 0) { + error << "Failed to allocate event buffer. Aborting." << endl; + exit(EXIT_FAILURE); + } + + _data->header_size = sizeof(LV2_Event_Buffer); + _data->data = reinterpret_cast<uint8_t*>(_data + _data->header_size); + _data->stamp_type = 0; + _data->event_count = 0; + _data->capacity = (uint32_t)capacity; + _data->size = 0; + + clear(); +} + +EventBuffer::~EventBuffer() +{ + free(_data); +} + +void +EventBuffer::prepare_read(Context& context) +{ + rewind(); +} + +void +EventBuffer::prepare_write(Context& context) +{ + if (context.offset() == 0) + clear(); +} + +void +EventBuffer::copy(Context& context, const Buffer* src_buf) +{ + const EventBuffer* src = dynamic_cast<const EventBuffer*>(src_buf); + if (src->_data == _data) + return; + + assert(src->_data->header_size == _data->header_size); + assert(capacity() >= _data->header_size + src->_data->size); + + rewind(); + + memcpy(_data, src->_data, _data->header_size + src->_data->size); + + _iter = src->_iter; + _iter.buf = _data; + + _latest_frames = src->_latest_frames; + _latest_subframes = src->_latest_subframes; + + assert(event_count() == src->event_count()); +} + +/** Increment the read position by one event. + * + * \return true if increment was successful, or false if end of buffer reached. + */ +bool +EventBuffer::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 +EventBuffer::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 +EventBuffer::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; + } +} + +/** Get the object currently pointed to, or NULL if invalid. + */ +LV2_Atom* +EventBuffer::get_atom() const +{ + if (lv2_event_is_valid(&_iter)) { + uint8_t* data; + LV2_Event* ev = lv2_event_get(&_iter, &data); + return LV2_ATOM_FROM_EVENT(ev); + } + return NULL; +} + +/** Get the event currently pointed to, or NULL if invalid. + */ +LV2_Event* +EventBuffer::get_event() const +{ + if (lv2_event_is_valid(&_iter)) { + uint8_t* data; + return lv2_event_get(&_iter, &data); + } + return NULL; +} + +/** Append an event to the buffer. + * + * \a timestamp must be >= the latest event in the buffer. + * + * \return true on success + */ +bool +EventBuffer::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 + + /*debug << "Appending event type " << type << ", size " << size + << " @ " << frames << "." << subframes << endl;*/ + + if (!lv2_event_write(&_iter, frames, subframes, type, size, data)) { + error << "Failed to write event." << endl; + return false; + } else { + _latest_frames = frames; + _latest_subframes = subframes; + return true; + } +} + +} // namespace Server +} // namespace Ingen |