root/trunk/libffado/src/libstreaming/amdtp/AmdtpTransmitStreamProcessor.h

Revision 857, 6.2 kB (checked in by ppalmers, 15 years ago)

Introduce distinction between empty and silent packets. When shutting down a transmit SP, we now send silent (= valid, but all audio muted) packets instead of empty (w/o
payload) packets for a while. This should solve the shutdown issue with the motu's.

Line 
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 program is free software: you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License as published by
11  * the Free Software Foundation, either version 3 of the License, or
12  * (at your option) any later version.
13  *
14  * This program is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17  * GNU General Public License for more details.
18  *
19  * You should have received a copy of the GNU General Public License
20  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
21  *
22  */
23
24 #ifndef __FFADO_AMDTPTRANSMITSTREAMPROCESSOR__
25 #define __FFADO_AMDTPTRANSMITSTREAMPROCESSOR__
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 /*!
61 \brief The Base Class for an AMDTP transmit stream processor
62
63  This class implements a TransmitStreamProcessor that multiplexes Ports
64  into AMDTP streams.
65
66 */
67 class AmdtpTransmitStreamProcessor
68     : public StreamProcessor
69 {
70
71 public:
72     /**
73      * Create a AMDTP transmit StreamProcessor
74      * @param port 1394 port
75      * @param framerate frame rate
76      * @param dimension number of substreams in the ISO stream
77      *                  (midi-muxed is only one stream)
78      */
79     AmdtpTransmitStreamProcessor(FFADODevice &parent, int dimension);
80     virtual ~AmdtpTransmitStreamProcessor() {};
81
82     enum eChildReturnValue generatePacketHeader(unsigned char *data, unsigned int *length,
83                               unsigned char *tag, unsigned char *sy,
84                               int cycle, unsigned int dropped, unsigned int max_length);
85     enum eChildReturnValue generatePacketData(unsigned char *data, unsigned int *length,
86                             unsigned char *tag, unsigned char *sy,
87                             int cycle, unsigned int dropped, unsigned int max_length);
88     enum eChildReturnValue generateEmptyPacketHeader(unsigned char *data, unsigned int *length,
89                                     unsigned char *tag, unsigned char *sy,
90                                     int cycle, unsigned int dropped, unsigned int max_length);
91     enum eChildReturnValue generateEmptyPacketData(unsigned char *data, unsigned int *length,
92                                   unsigned char *tag, unsigned char *sy,
93                                   int cycle, unsigned int dropped, unsigned int max_length);
94     enum eChildReturnValue generateSilentPacketHeader(unsigned char *data, unsigned int *length,
95                                     unsigned char *tag, unsigned char *sy,
96                                     int cycle, unsigned int dropped, unsigned int max_length);
97     enum eChildReturnValue generateSilentPacketData(unsigned char *data, unsigned int *length,
98                                   unsigned char *tag, unsigned char *sy,
99                                   int cycle, unsigned int dropped, unsigned int max_length);
100     virtual bool prepareChild();
101
102 public:
103     virtual unsigned int getEventSize()
104                     {return 4;};
105     virtual unsigned int getMaxPacketSize()
106                     {return 4 * (2 + getSytInterval() * m_dimension);};
107     virtual unsigned int getEventsPerFrame()
108                     { return m_dimension; };
109     virtual unsigned int getNominalFramesPerPacket()
110                     {return getSytInterval();};
111
112 protected:
113     bool processWriteBlock(char *data, unsigned int nevents, unsigned int offset);
114     bool transmitSilenceBlock(char *data, unsigned int nevents, unsigned int offset);
115
116 private:
117     unsigned int fillNoDataPacketHeader(struct iec61883_packet *packet, unsigned int* length);
118     unsigned int fillDataPacketHeader(struct iec61883_packet *packet, unsigned int* length, uint32_t ts);
119
120     int transmitBlock(char *data, unsigned int nevents,
121                         unsigned int offset);
122
123     void encodeAudioPortsSilence(quadlet_t *data, unsigned int offset, unsigned int nevents);
124     void encodeAudioPortsFloat(quadlet_t *data, unsigned int offset, unsigned int nevents);
125     void encodeAudioPortsInt24(quadlet_t *data, unsigned int offset, unsigned int nevents);
126     void encodeMidiPortsSilence(quadlet_t *data, unsigned int offset, unsigned int nevents);
127     void encodeMidiPorts(quadlet_t *data, unsigned int offset, unsigned int nevents);
128
129     unsigned int getFDF();
130     unsigned int getSytInterval();
131
132     struct iec61883_cip m_cip_status;
133     int m_dimension;
134     unsigned int m_syt_interval;
135     int m_fdf;
136     unsigned int m_dbc;
137
138 private: // local port caching for performance
139     struct _MBLA_port_cache {
140         AmdtpAudioPort*     port;
141         void*               buffer;
142         bool                enabled;
143 #ifdef DEBUG
144         unsigned int        buffer_size;
145 #endif
146     };
147     std::vector<struct _MBLA_port_cache> m_audio_ports;
148     unsigned int m_nb_audio_ports;
149
150     struct _MIDI_port_cache {
151         AmdtpMidiPort*      port;
152         void*               buffer;
153         bool                enabled;
154         unsigned int        position;
155         unsigned int        location;
156 #ifdef DEBUG
157         unsigned int        buffer_size;
158 #endif
159     };
160     std::vector<struct _MIDI_port_cache> m_midi_ports;
161     unsigned int m_nb_midi_ports;
162
163     bool initPortCache();
164     void updatePortCache();
165 };
166
167 } // end of namespace Streaming
168
169 #endif /* __FFADO_AMDTPTRANSMITSTREAMPROCESSOR__ */
170
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