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/* |
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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_AMDTPRECEIVESTREAMPROCESSOR__ |
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#define __FFADO_AMDTPRECEIVESTREAMPROCESSOR__ |
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/** |
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* This class implements IEC61883-6 / AM824 / AMDTP based streaming |
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*/ |
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#include "AmdtpStreamProcessor-common.h" |
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namespace Streaming { |
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class Port; |
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class AmdtpAudioPort; |
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class AmdtpMidiPort; |
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/*! |
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\brief The Base Class for an AMDTP receive stream processor |
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This class implements a ReceiveStreamProcessor that demultiplexes |
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AMDTP streams into Ports. |
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*/ |
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class AmdtpReceiveStreamProcessor |
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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 AMDTP receive StreamProcessor |
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* @param port 1394 port |
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* @param dimension number of substreams in the ISO stream |
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* (midi-muxed is only one stream) |
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*/ |
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AmdtpReceiveStreamProcessor(FFADODevice &parent, int dimension); |
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virtual ~AmdtpReceiveStreamProcessor() {}; |
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virtual enum eChildReturnValue processPacketHeader(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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virtual enum eChildReturnValue processPacketData(unsigned char *data, unsigned int length); |
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virtual bool prepareChild(); |
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public: |
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virtual unsigned int getEventSize() |
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{return 4;}; |
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virtual unsigned int getMaxPacketSize() |
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{return 4 * (2 + getSytInterval() * m_dimension);}; |
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virtual unsigned int getEventsPerFrame() |
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{ return m_dimension; }; |
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virtual unsigned int getNominalFramesPerPacket() |
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{return getSytInterval();}; |
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protected: |
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bool processReadBlock(char *data, unsigned int nevents, unsigned int offset); |
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protected: |
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void decodeAudioPortsFloat(quadlet_t *data, unsigned int offset, unsigned int nevents); |
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void decodeAudioPortsInt24(quadlet_t *data, unsigned int offset, unsigned int nevents); |
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void decodeMidiPorts(quadlet_t *data, unsigned int offset, unsigned int nevents); |
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unsigned int getSytInterval(); |
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int m_dimension; |
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unsigned int m_syt_interval; |
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private: // local port caching for performance |
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struct _MBLA_port_cache { |
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AmdtpAudioPort* port; |
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void* buffer; |
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bool enabled; |
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#ifdef DEBUG |
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unsigned int buffer_size; |
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#endif |
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}; |
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std::vector<struct _MBLA_port_cache> m_audio_ports; |
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unsigned int m_nb_audio_ports; |
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struct _MIDI_port_cache { |
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AmdtpMidiPort* port; |
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void* buffer; |
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bool enabled; |
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unsigned int position; |
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unsigned int location; |
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#ifdef DEBUG |
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unsigned int buffer_size; |
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#endif |
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}; |
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std::vector<struct _MIDI_port_cache> m_midi_ports; |
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unsigned int m_nb_midi_ports; |
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/* A small MIDI buffer to cover for the case where we need to span a |
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* period - that is, if more than one MIDI byte is sent per packet. |
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* Since the long-term average data rate must be close to the MIDI spec |
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* (as it's coming from a physical MIDI port_ this buffer doesn't have |
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* to be particularly large. The size is a power of 2 for optimisation |
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* reasons. |
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* |
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* FIXME: it is yet to be determined whether this is required for RME |
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* devices. |
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* |
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* FIXME: copied from RmeReceiveStreamProcessor.h. Needs refactoring |
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*/ |
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#define RX_MIDIBUFFER_SIZE_EXP 6 |
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#define RX_MIDIBUFFER_SIZE (1<<RX_MIDIBUFFER_SIZE_EXP) |
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unsigned int midibuffer[RX_MIDIBUFFER_SIZE]; |
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unsigned mb_head, mb_tail; |
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bool initPortCache(); |
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void updatePortCache(); |
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}; |
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} // end of namespace Streaming |
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#endif /* __FFADO_AMDTPRECEIVESTREAMPROCESSOR__ */ |
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