root/trunk/libffado/src/libieee1394/IsoHandler.h

Revision 803, 5.1 kB (checked in by ppalmers, 13 years ago)

more reliable streaming. hackish, but a start for a better implementation

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_ISOHANDLER__
25 #define __FFADO_ISOHANDLER__
26
27 #include "debugmodule/debugmodule.h"
28 #include "IsoHandlerManager.h"
29
30 #include "libutil/Thread.h"
31
32 enum raw1394_iso_disposition;
33
34 namespace Streaming {
35     class StreamProcessor;
36 }
37
38 /*!
39 \brief The Base Class for ISO Handlers
40
41  These classes perform the actual ISO communication through libraw1394.
42  They are different from Streaming::StreamProcessors because one handler can provide multiple
43  streams with packets in case of ISO multichannel receive.
44
45 */
46
47 class IsoHandler : public Util::RunnableInterface
48 {
49 public:
50     enum EHandlerType {
51             eHT_Receive,
52             eHT_Transmit
53     };
54     IsoHandler(IsoHandlerManager& manager, enum EHandlerType t);
55     IsoHandler(IsoHandlerManager& manager, enum EHandlerType t,
56                unsigned int buf_packets, unsigned int max_packet_size, int irq);
57     IsoHandler(IsoHandlerManager& manager, enum EHandlerType t,
58                unsigned int buf_packets, unsigned int max_packet_size, int irq, enum raw1394_iso_speed speed);
59     ~IsoHandler();
60
61 private: // the ISO callback interface
62     static enum raw1394_iso_disposition
63     iso_receive_handler(raw1394handle_t handle, unsigned char *data,
64                         unsigned int length, unsigned char channel,
65                         unsigned char tag, unsigned char sy, unsigned int cycle,
66                         unsigned int dropped);
67
68     enum raw1394_iso_disposition
69             putPacket(unsigned char *data, unsigned int length,
70                         unsigned char channel, unsigned char tag, unsigned char sy,
71                         unsigned int cycle, unsigned int dropped);
72
73     static enum raw1394_iso_disposition iso_transmit_handler(raw1394handle_t handle,
74                     unsigned char *data, unsigned int *length,
75                     unsigned char *tag, unsigned char *sy,
76                     int cycle, unsigned int dropped);
77     enum raw1394_iso_disposition
78             getPacket(unsigned char *data, unsigned int *length,
79                     unsigned char *tag, unsigned char *sy,
80                     int cycle, unsigned int dropped);
81
82 public:
83     // runnable interface
84     bool Init();
85     bool Execute();
86     bool iterate();
87
88     int getFileDescriptor() { return raw1394_get_fd(m_handle);};
89     bool setThreadParameters(bool rt, int priority);
90
91     bool init();
92     bool prepare();
93
94     void setVerboseLevel(int l);
95
96     bool enable() {return enable(-1);};
97     bool enable(int cycle);
98     bool disable();
99
100     void flush();
101     enum EHandlerType getType() {return m_type;};
102
103     bool isEnabled()
104         {return m_State == E_Running;};
105
106     // no setter functions, because those would require a re-init
107     unsigned int getMaxPacketSize() { return m_max_packet_size;};
108     unsigned int getNbBuffers() { return m_buf_packets;};
109     int getPacketLatency() { return m_irq_interval;};
110
111     int getPacketCount() {return m_packetcount;};
112     void resetPacketCount() {m_packetcount=0;};
113
114     int getDroppedCount() {return m_dropped;};
115     void resetDroppedCount() {m_dropped=0;};
116
117     unsigned int getPreBuffers() {return m_prebuffers;};
118     void setPreBuffers(unsigned int n) {m_prebuffers=n;};
119
120     void dumpInfo();
121
122     bool inUse() {return (m_Client != 0) ;};
123     bool isStreamRegistered(Streaming::StreamProcessor *s) {return (m_Client == s);};
124
125     bool registerStream(Streaming::StreamProcessor *);
126     bool unregisterStream(Streaming::StreamProcessor *);
127
128     bool waitForClient();
129     bool tryWaitForClient();
130
131 private:
132     IsoHandlerManager& m_manager;
133     enum EHandlerType m_type;
134     raw1394handle_t m_handle;
135     unsigned int    m_buf_packets;
136     unsigned int    m_max_packet_size;
137     int             m_irq_interval;
138
139     int m_packetcount;
140     int m_dropped;
141     Streaming::StreamProcessor *m_Client;
142
143     int handleBusReset(unsigned int generation);
144
145     static int busreset_handler(raw1394handle_t handle, unsigned int generation);
146
147     struct pollfd   m_poll_fd;
148     int             m_poll_timeout;
149     // threading
150     bool            m_realtime;
151     int             m_priority;
152     Util::Thread *  m_Thread;
153
154     enum raw1394_iso_speed m_speed;
155     unsigned int m_prebuffers;
156
157     // the state machine
158     enum EHandlerStates {
159         E_Created,
160         E_Initialized,
161         E_Prepared,
162         E_Running,
163         E_Error
164     };
165     enum EHandlerStates m_State;
166     DECLARE_DEBUG_MODULE;
167 };
168
169 #endif /* __FFADO_ISOHANDLER__  */
170
171
172
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