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/* |
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* Copyright (C) 2005-2009 by Jonathan Woithe |
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* Copyright (C) 2005-2008 by Pieter Palmers |
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* |
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* This file is part of FFADO |
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* FFADO = Free FireWire (pro-)audio drivers for Linux |
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* |
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* FFADO is based upon FreeBoB. |
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* |
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* This program is free software: you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation, either version 2 of the License, or |
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* (at your option) version 3 of the License. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program. If not, see <http://www.gnu.org/licenses/>. |
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* |
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*/ |
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#ifndef __FFADO_RMETRANSMITSTREAMPROCESSOR__ |
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#define __FFADO_RMETRANSMITSTREAMPROCESSOR__ |
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/** |
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* This class implements RME based streaming |
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*/ |
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#include "debugmodule/debugmodule.h" |
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#include "../generic/StreamProcessor.h" |
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#include "../util/cip.h" |
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namespace Streaming { |
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class Port; |
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class RmeAudioPort; |
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class RmeMidiPort; |
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/*! |
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\brief The Base Class for an RME transmit stream processor |
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This class implements a TransmitStreamProcessor that multiplexes Ports |
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into RME streams. |
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*/ |
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class RmeTransmitStreamProcessor |
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: public StreamProcessor |
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{ |
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public: |
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/** |
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* Create a RME transmit StreamProcessor |
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*/ |
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RmeTransmitStreamProcessor(FFADODevice &parent, |
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unsigned int model, unsigned int event_size); |
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virtual ~RmeTransmitStreamProcessor() {}; |
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enum eChildReturnValue generatePacketHeader(unsigned char *data, unsigned int *length, |
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unsigned char *tag, unsigned char *sy, |
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uint32_t pkt_ctr); |
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enum eChildReturnValue generatePacketData(unsigned char *data, unsigned int *length); |
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enum eChildReturnValue generateEmptyPacketHeader(unsigned char *data, unsigned int *length, |
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unsigned char *tag, unsigned char *sy, |
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uint32_t pkt_ctr); |
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enum eChildReturnValue generateEmptyPacketData(unsigned char *data, unsigned int *length); |
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enum eChildReturnValue generateSilentPacketHeader(unsigned char *data, unsigned int *length, |
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unsigned char *tag, unsigned char *sy, |
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uint32_t pkt_ctr); |
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enum eChildReturnValue generateSilentPacketData(unsigned char *data, unsigned int *length); |
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virtual bool prepareChild(); |
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bool resetForStreaming(); |
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public: |
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virtual unsigned int getEventSize() |
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{return m_event_size;}; |
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virtual unsigned int getMaxPacketSize(); |
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virtual unsigned int getEventsPerFrame() |
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{ return 1; }; |
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virtual unsigned int getNominalFramesPerPacket(); |
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protected: |
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bool processWriteBlock(char *data, unsigned int nevents, unsigned int offset); |
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bool transmitSilenceBlock(char *data, unsigned int nevents, unsigned int offset); |
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private: |
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unsigned int fillNoDataPacketHeader(quadlet_t *data, unsigned int* length); |
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unsigned int fillDataPacketHeader(quadlet_t *data, unsigned int* length, uint32_t ts); |
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int transmitBlock(char *data, unsigned int nevents, |
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unsigned int offset); |
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bool encodePacketPorts(quadlet_t *data, unsigned int nevents, |
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unsigned int dbc); |
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int encodePortToRmeEvents(RmeAudioPort *, quadlet_t *data, |
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unsigned int offset, unsigned int nevents); |
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int encodeSilencePortToRmeEvents(RmeAudioPort *, quadlet_t *data, |
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unsigned int offset, unsigned int nevents); |
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int encodePortToRmeMidiEvents( |
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RmeMidiPort *p, quadlet_t *data, |
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unsigned int offset, unsigned int nevents); |
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int encodeSilencePortToRmeMidiEvents( |
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RmeMidiPort *p, quadlet_t *data, |
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unsigned int offset, unsigned int nevents); |
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unsigned int m_rme_model; |
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/* |
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* An iso packet mostly consists of multiple events. m_event_size |
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* is the size of a single 'event' in bytes. |
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*/ |
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unsigned int m_event_size; |
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// Keep track of transmission data block count |
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unsigned int m_tx_dbc; |
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// A simple circular buffer for outgoing MIDI data to allow |
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// a rate control to be implemented on the data to suit the RME |
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// devices. Note that this buffer's size is forced to be a power |
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// of 2 to allow for buffer manipulation optimisations. |
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// FIXME: it is yet to be determined whether this is necessary for |
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// the RME device. |
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#define MIDIBUFFER_SIZE_EXP 10 |
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#define MIDIBUFFER_SIZE (1<<MIDIBUFFER_SIZE_EXP) |
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unsigned int midibuffer[MIDIBUFFER_SIZE]; |
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unsigned int mb_head, mb_tail; |
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unsigned int midi_lock; |
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signed int streaming_has_run, streaming_has_dryrun; |
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signed int streaming_start_count; |
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unsigned int midi_tx_period; /* Measured in audio clock periods */ |
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}; |
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} // end of namespace Streaming |
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#endif /* __FFADO_RMETRANSMITSTREAMPROCESSOR__ */ |
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