1 // MediaWriter.h 2 // 3 // Andrew Bachmann, 2002 4 // 5 // A MediaWriter is a node that 6 // implements FileInterface and BBufferConsumer. 7 // It consumes on input, which is a multistream, 8 // and writes the stream to a file. It has a rather 9 // unique interpretation of time. Time is 10 // distance in the file. So the duration is the 11 // file length. (in bytes) 12 13 #if !defined(_MEDIA_WRITER_H) 14 #define _MEDIA_WRITER_H 15 16 #include <MediaDefs.h> 17 #include <MediaNode.h> 18 #include <FileInterface.h> 19 #include <BufferConsumer.h> 20 #include <Controllable.h> 21 #include <MediaEventLooper.h> 22 #include <File.h> 23 #include <Entry.h> 24 #include <BufferGroup.h> 25 26 #include "../AbstractFileInterfaceNode.h" 27 28 class MediaWriter : 29 public BBufferConsumer, 30 public AbstractFileInterfaceNode 31 { 32 protected: 33 virtual ~MediaWriter(void); 34 35 public: 36 37 explicit MediaWriter( 38 size_t defaultChunkSize = 8192, // chunk size = 8 KB 39 float defaultBitRate = 800000, // bit rate = 100.000 KB/sec = 5.85 MB/minute 40 const flavor_info * info = 0, // buffer period = 80 milliseconds 41 BMessage * config = 0, 42 BMediaAddOn * addOn = 0); 43 44 /*************************/ 45 /* begin from BMediaNode */ 46 protected: 47 /* These don't return errors; instead, they use the global error condition reporter. */ 48 /* A node is required to have a queue of at least one pending command (plus TimeWarp) */ 49 /* and is recommended to allow for at least one pending command of each type. */ 50 /* Allowing an arbitrary number of outstanding commands might be nice, but apps */ 51 /* cannot depend on that happening. */ 52 virtual void Preroll(void); 53 54 public: 55 virtual status_t HandleMessage( 56 int32 message, 57 const void * data, 58 size_t size); 59 60 protected: 61 virtual void NodeRegistered(void); /* reserved 2 */ 62 63 /* end from BMediaNode */ 64 /***********************/ 65 66 /*****************************/ 67 /* begin from BFileInterface */ 68 protected: 69 70 using AbstractFileInterfaceNode::SetRef; 71 72 virtual status_t SetRef( 73 const entry_ref & file, 74 bool create, 75 bigtime_t * out_time); 76 77 /* end from BFileInterface */ 78 /***************************/ 79 80 // provided for BMediaWriterAddOn 81 public: 82 static status_t StaticSniffRef( 83 const entry_ref & file, 84 char * out_mime_type, /* 256 bytes */ 85 float * out_quality); 86 87 /******************************/ 88 /* begin from BBufferConsumer */ 89 90 //included from BMediaAddOn 91 //virtual status_t HandleMessage( 92 // int32 message, 93 // const void * data, 94 // size_t size); 95 96 /* Someone, probably the producer, is asking you about this format. Give */ 97 /* your honest opinion, possibly modifying *format. Do not ask upstream */ 98 /* producer about the format, since he's synchronously waiting for your */ 99 /* reply. */ 100 virtual status_t AcceptFormat( 101 const media_destination & dest, 102 media_format * format); 103 virtual status_t GetNextInput( 104 int32 * cookie, 105 media_input * out_input); 106 virtual void DisposeInputCookie( 107 int32 cookie); 108 virtual void BufferReceived( 109 BBuffer * buffer); 110 virtual void ProducerDataStatus( 111 const media_destination & for_whom, 112 int32 status, 113 bigtime_t at_performance_time); 114 virtual status_t GetLatencyFor( 115 const media_destination & for_whom, 116 bigtime_t * out_latency, 117 media_node_id * out_timesource); 118 virtual status_t Connected( 119 const media_source & producer, /* here's a good place to request buffer group usage */ 120 const media_destination & where, 121 const media_format & with_format, 122 media_input * out_input); 123 virtual void Disconnected( 124 const media_source & producer, 125 const media_destination & where); 126 /* The notification comes from the upstream producer, so he's already cool with */ 127 /* the format; you should not ask him about it in here. */ 128 virtual status_t FormatChanged( 129 const media_source & producer, 130 const media_destination & consumer, 131 int32 change_tag, 132 const media_format & format); 133 134 /* Given a performance time of some previous buffer, retrieve the remembered tag */ 135 /* of the closest (previous or exact) performance time. Set *out_flags to 0; the */ 136 /* idea being that flags can be added later, and the understood flags returned in */ 137 /* *out_flags. */ 138 virtual status_t SeekTagRequested( 139 const media_destination & destination, 140 bigtime_t in_target_time, 141 uint32 in_flags, 142 media_seek_tag * out_seek_tag, 143 bigtime_t * out_tagged_time, 144 uint32 * out_flags); 145 146 /* end from BBufferConsumer */ 147 /****************************/ 148 149 /*****************/ 150 /* BControllable */ 151 /*****************/ 152 153 /*********************/ 154 /* BMediaEventLooper */ 155 /*********************/ 156 157 protected: 158 159 virtual status_t HandleBuffer( 160 const media_timed_event *event, 161 bigtime_t lateness, 162 bool realTimeEvent = false); 163 virtual status_t HandleDataStatus( 164 const media_timed_event *event, 165 bigtime_t lateness, 166 bool realTimeEvent = false); 167 168 public: 169 170 static void GetFlavor(flavor_info * outInfo, int32 id); 171 static void GetFormat(media_format * outFormat); 172 static void GetFileFormat(media_file_format * outFileFormat); 173 174 protected: 175 176 virtual status_t WriteFileBuffer(BBuffer * buffer); 177 178 private: 179 180 MediaWriter( /* private unimplemented */ 181 const MediaWriter & clone); 182 MediaWriter & operator=( 183 const MediaWriter & clone); 184 185 media_input input; 186 187 BBufferGroup * fBufferGroup; 188 bigtime_t fInternalLatency; 189 // this is computed from the real (negotiated) chunk size and bit rate, 190 // not the defaults that are in the parameters 191 bigtime_t fBufferPeriod; 192 193 /* Mmmh, stuffing! */ 194 virtual status_t _Reserved_MediaWriter_0(void *); 195 virtual status_t _Reserved_MediaWriter_1(void *); 196 virtual status_t _Reserved_MediaWriter_2(void *); 197 virtual status_t _Reserved_MediaWriter_3(void *); 198 virtual status_t _Reserved_MediaWriter_4(void *); 199 virtual status_t _Reserved_MediaWriter_5(void *); 200 virtual status_t _Reserved_MediaWriter_6(void *); 201 virtual status_t _Reserved_MediaWriter_7(void *); 202 virtual status_t _Reserved_MediaWriter_8(void *); 203 virtual status_t _Reserved_MediaWriter_9(void *); 204 virtual status_t _Reserved_MediaWriter_10(void *); 205 virtual status_t _Reserved_MediaWriter_11(void *); 206 virtual status_t _Reserved_MediaWriter_12(void *); 207 virtual status_t _Reserved_MediaWriter_13(void *); 208 virtual status_t _Reserved_MediaWriter_14(void *); 209 virtual status_t _Reserved_MediaWriter_15(void *); 210 211 uint32 _reserved_media_writer_[16]; 212 213 }; 214 215 #endif /* _MEDIA_WRITER_H */ 216