1 // MediaReader.h 2 // 3 // Andrew Bachmann, 2002 4 // 5 // A MediaReader is a node that 6 // implements FileInterface and BBufferProducer. 7 // It reads any file and produces one output, 8 // which is a multistream. 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_READER_H) 14 #define _MEDIA_READER_H 15 16 #include <MediaDefs.h> 17 #include <MediaNode.h> 18 #include <FileInterface.h> 19 #include <BufferProducer.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 MediaReader : 29 public BBufferProducer, 30 public AbstractFileInterfaceNode 31 { 32 protected: 33 virtual ~MediaReader(void); 34 35 public: 36 37 explicit MediaReader( 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 BMediaReaderAddOn 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 BBufferProducer */ 89 protected: 90 /* functionality of BBufferProducer */ 91 virtual status_t FormatSuggestionRequested( 92 media_type type, 93 int32 quality, 94 media_format * format); 95 virtual status_t FormatProposal( 96 const media_source & output, 97 media_format * format); 98 /* If the format isn't good, put a good format into *io_format and return error */ 99 /* If format has wildcard, specialize to what you can do (and change). */ 100 /* If you can change the format, return OK. */ 101 /* The request comes from your destination sychronously, so you cannot ask it */ 102 /* whether it likes it -- you should assume it will since it asked. */ 103 virtual status_t FormatChangeRequested( 104 const media_source & source, 105 const media_destination & destination, 106 media_format * io_format, 107 int32 * _deprecated_); 108 virtual status_t GetNextOutput( /* cookie starts as 0 */ 109 int32 * cookie, 110 media_output * out_output); 111 virtual status_t DisposeOutputCookie( 112 int32 cookie); 113 /* In this function, you should either pass on the group to your upstream guy, */ 114 /* or delete your current group and hang on to this group. Deleting the previous */ 115 /* group (unless you passed it on with the reclaim flag set to false) is very */ 116 /* important, else you will 1) leak memory and 2) block someone who may want */ 117 /* to reclaim the buffers living in that group. */ 118 virtual status_t SetBufferGroup( 119 const media_source & for_source, 120 BBufferGroup * group); 121 /* Format of clipping is (as int16-s): <from line> <npairs> <startclip> <endclip>. */ 122 /* Repeat for each line where the clipping is different from the previous line. */ 123 /* If <npairs> is negative, use the data from line -<npairs> (there are 0 pairs after */ 124 /* a negative <npairs>. Yes, we only support 32k*32k frame buffers for clipping. */ 125 /* Any non-0 field of 'display' means that that field changed, and if you don't support */ 126 /* that change, you should return an error and ignore the request. Note that the buffer */ 127 /* offset values do not have wildcards; 0 (or -1, or whatever) are real values and must */ 128 /* be adhered to. */ 129 virtual status_t VideoClippingChanged( 130 const media_source & for_source, 131 int16 num_shorts, 132 int16 * clip_data, 133 const media_video_display_info & display, 134 int32 * _deprecated_); 135 /* Iterates over all outputs and maxes the latency found */ 136 virtual status_t GetLatency( 137 bigtime_t * out_latency); 138 virtual status_t PrepareToConnect( 139 const media_source & what, 140 const media_destination & where, 141 media_format * format, 142 media_source * out_source, 143 char * out_name); 144 virtual void Connect( 145 status_t error, 146 const media_source & source, 147 const media_destination & destination, 148 const media_format & format, 149 char * io_name); 150 virtual void Disconnect( 151 const media_source & what, 152 const media_destination & where); 153 virtual void LateNoticeReceived( 154 const media_source & what, 155 bigtime_t how_much, 156 bigtime_t performance_time); 157 virtual void EnableOutput( 158 const media_source & what, 159 bool enabled, 160 int32 * _deprecated_); 161 virtual status_t SetPlayRate( 162 int32 numer, 163 int32 denom); 164 165 //included from BMediaNode 166 //virtual status_t HandleMessage( /* call this from the thread that listens to the port */ 167 // int32 message, 168 // const void * data, 169 // size_t size); 170 171 virtual void AdditionalBufferRequested( // used to be Reserved 0 172 const media_source & source, 173 media_buffer_id prev_buffer, 174 bigtime_t prev_time, 175 const media_seek_tag * prev_tag); // may be NULL 176 177 virtual void LatencyChanged( // used to be Reserved 1 178 const media_source & source, 179 const media_destination & destination, 180 bigtime_t new_latency, 181 uint32 flags); 182 183 /* end from BBufferProducer */ 184 /****************************/ 185 186 /*****************/ 187 /* BControllable */ 188 /*****************/ 189 190 /*********************/ 191 /* BMediaEventLooper */ 192 /*********************/ 193 194 protected: 195 196 virtual status_t HandleBuffer( 197 const media_timed_event *event, 198 bigtime_t lateness, 199 bool realTimeEvent = false); 200 virtual status_t HandleDataStatus( 201 const media_timed_event *event, 202 bigtime_t lateness, 203 bool realTimeEvent = false); 204 205 public: 206 207 static void GetFlavor(flavor_info * outInfo, int32 id); 208 static void GetFormat(media_format * outFormat); 209 static void GetFileFormat(media_file_format * outFileFormat); 210 211 protected: 212 213 virtual status_t GetFilledBuffer(BBuffer ** outBuffer); 214 virtual status_t FillFileBuffer(BBuffer * buffer); 215 216 private: 217 218 MediaReader( /* private unimplemented */ 219 const MediaReader & clone); 220 MediaReader & operator=( 221 const MediaReader & clone); 222 223 media_output output; 224 225 bool fOutputEnabled; 226 227 BBufferGroup * fBufferGroup; 228 bigtime_t fDownstreamLatency; 229 bigtime_t fInternalLatency; 230 // this is computed from the real (negotiated) chunk size and bit rate, 231 // not the defaults that are in the parameters 232 bigtime_t fBufferPeriod; 233 234 /* Mmmh, stuffing! */ 235 virtual status_t _Reserved_MediaReader_0(void *); 236 virtual status_t _Reserved_MediaReader_1(void *); 237 virtual status_t _Reserved_MediaReader_2(void *); 238 virtual status_t _Reserved_MediaReader_3(void *); 239 virtual status_t _Reserved_MediaReader_4(void *); 240 virtual status_t _Reserved_MediaReader_5(void *); 241 virtual status_t _Reserved_MediaReader_6(void *); 242 virtual status_t _Reserved_MediaReader_7(void *); 243 virtual status_t _Reserved_MediaReader_8(void *); 244 virtual status_t _Reserved_MediaReader_9(void *); 245 virtual status_t _Reserved_MediaReader_10(void *); 246 virtual status_t _Reserved_MediaReader_11(void *); 247 virtual status_t _Reserved_MediaReader_12(void *); 248 virtual status_t _Reserved_MediaReader_13(void *); 249 virtual status_t _Reserved_MediaReader_14(void *); 250 virtual status_t _Reserved_MediaReader_15(void *); 251 252 uint32 _reserved_media_reader_[16]; 253 254 }; 255 256 #endif /* _MEDIA_READER_H */ 257