root/branches/ppalmers-streaming/src/libstreaming/amdtp/AmdtpReceiveStreamProcessor.h

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1 /*
2  * Copyright (C) 2005-2007 by Pieter Palmers
3  *
4  * This file is part of FFADO
5  * FFADO = Free Firewire (pro-)audio drivers for linux
6  *
7  * FFADO is based upon FreeBoB.
8  *
9  * This library is free software; you can redistribute it and/or
10  * modify it under the terms of the GNU Lesser General Public
11  * License version 2.1, as published by the Free Software Foundation;
12  *
13  * This library is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with this library; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
21  * MA 02110-1301 USA
22  */
23
24 #ifndef __FFADO_AMDTPRECEIVESTREAMPROCESSOR__
25 #define __FFADO_AMDTPRECEIVESTREAMPROCESSOR__
26
27 /**
28  * This class implements IEC61883-6 / AM824 / AMDTP based streaming
29  */
30
31 #include "debugmodule/debugmodule.h"
32
33 #include "../generic/StreamProcessor.h"
34 #include "../util/cip.h"
35
36 #include <libiec61883/iec61883.h>
37 #include <pthread.h>
38
39 #define AMDTP_MAX_PACKET_SIZE 2048
40
41 #define IEC61883_STREAM_TYPE_MIDI   0x0D
42 #define IEC61883_STREAM_TYPE_SPDIF  0x00
43 #define IEC61883_STREAM_TYPE_MBLA   0x06
44
45 #define IEC61883_AM824_LABEL_MASK             0xFF000000
46 #define IEC61883_AM824_GET_LABEL(x)         (((x) & 0xFF000000) >> 24)
47 #define IEC61883_AM824_SET_LABEL(x,y)         ((x) | ((y)<<24))
48
49 #define IEC61883_AM824_LABEL_MIDI_NO_DATA     0x80
50 #define IEC61883_AM824_LABEL_MIDI_1X          0x81
51 #define IEC61883_AM824_LABEL_MIDI_2X          0x82
52 #define IEC61883_AM824_LABEL_MIDI_3X          0x83
53
54 namespace Streaming {
55
56 class Port;
57 class AmdtpAudioPort;
58 class AmdtpMidiPort;
59 /*!
60 \brief The Base Class for an AMDTP receive stream processor
61
62  This class implements a ReceiveStreamProcessor that demultiplexes
63  AMDTP streams into Ports.
64
65 */
66 class AmdtpReceiveStreamProcessor
67     : public StreamProcessor
68 {
69
70 public:
71     /**
72      * Create a AMDTP receive StreamProcessor
73      * @param port 1394 port
74      * @param dimension number of substreams in the ISO stream
75      *                  (midi-muxed is only one stream)
76      */
77     AmdtpReceiveStreamProcessor(int port, int dimension);
78     virtual ~AmdtpReceiveStreamProcessor() {};
79
80     bool processPacketHeader(unsigned char *data, unsigned int length,
81                   unsigned char channel, unsigned char tag, unsigned char sy,
82                   unsigned int cycle, unsigned int dropped);
83     bool processPacketData(unsigned char *data, unsigned int length,
84                   unsigned char channel, unsigned char tag, unsigned char sy,
85                   unsigned int cycle, unsigned int dropped);
86
87     virtual bool prepareChild();
88
89 public:
90     virtual unsigned int getEventSize()
91                     {return 4;};
92     virtual unsigned int getMaxPacketSize()
93                     {return 4 * (2 + m_syt_interval * m_dimension);};
94     virtual unsigned int getEventsPerFrame()
95                     { return m_dimension; };
96     virtual unsigned int getUpdatePeriod()
97                     {return m_syt_interval;};
98
99     // We have 1 period of samples = m_period
100     // this period takes m_period/m_framerate seconds of time
101     // during this time, 8000 packets are sent
102 //     unsigned int getPacketsPerPeriod() {return (m_period*8000)/m_framerate;};
103
104     // however, if we only count the number of used packets
105     // it is m_period / m_syt_interval
106     virtual unsigned int getPacketsPerPeriod();
107
108 protected:
109
110     bool processReadBlock(char *data, unsigned int nevents, unsigned int offset);
111     bool provideSilenceBlock(unsigned int nevents, unsigned int offset);
112
113     bool decodePacketPorts(quadlet_t *data, unsigned int nevents, unsigned int dbc);
114
115     int decodeMBLAEventsToPort(AmdtpAudioPort *, quadlet_t *data, unsigned int offset, unsigned int nevents);
116     int provideSilenceToPort(AmdtpAudioPort *p, unsigned int offset, unsigned int nevents);
117
118     int m_dimension;
119     unsigned int m_syt_interval;
120
121     uint64_t m_last_syt; /// FIXME:debug
122     uint64_t m_last_now; /// FIXME:debug
123 };
124
125
126 } // end of namespace Streaming
127
128 #endif /* __FFADO_AMDTPRECEIVESTREAMPROCESSOR__ */
129
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