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Wrap

C/C++ Source or Header | 1998-06-01 | 77.2 KB | 2,375 lines

/* ** ** $VER: dispatch.c 1.5 (1.6.98) ** mpegsystem.datatype 1.5 ** ** Dispatch routine for a DataTypes class ** ** Written 1997/1998 by Roland 'Gizzy' Mainz ** Original example source from David N. Junod ** */ /* main includes */ #include "classbase.h" #include "classdata.h" /*****************************************************************************/ /* is animation.datatype V41 ? */ #define ISV41 ((cb -> cb_SuperClassBase -> lib_Version) == 41U) /*****************************************************************************/ /* local prototypes */ /* virtual demux fs-handler related */ DISPATCHERFLAGS static void Handler( void ); static void RunHandler( struct ClassBase *cb, struct MPEGSystemInstData *msid ); static void KillHandler( struct ClassBase *cb, struct MPEGSystemInstData *msid ); static void dispatch_packet( struct ClassBase *cb, struct MPEGSystemInstData *msid, struct DosPacket *dp ); static BPTR GetStreamLock( struct ClassBase *cb, struct MPEGSystemInstData *msid, ULONG num, BOOL isaudio ); static void FreeLock( struct ClassBase *cb, struct MPEGSystemInstData *msid, struct FileLock *fl ); static BOOL SendSeek( struct ClassBase *, struct MPEGSystemInstData *, struct FileHandle *, LONG, LONG ); static BOOL SendRead( struct ClassBase *, struct MPEGSystemInstData *, struct FileHandle *, UBYTE *, ULONG ); static struct DosPacket *ObtainDOSPacket( struct ClassBase *, struct MPEGSystemInstData * ); static void ReleaseDOSPacket( struct ClassBase *, struct MPEGSystemInstData *, struct DosPacket * ); static void STRPTR2BSTR( STRPTR s ); /* MPEG system stream demultiplexer related */ static UBYTE *get_buf_data( struct ClassBase *cb, struct MPEGSystemInstData *msid, long read_len ); static UBYTE *calc_time_stamp( struct ClassBase *cb, struct MPEGSystemInstData *msid, UBYTE *buf_ptr , long *time_stamp ); static UBYTE get_next_start_code( struct ClassBase *cb, struct MPEGSystemInstData *msid ); static void read_pack_header( struct ClassBase *cb, struct MPEGSystemInstData *msid, PACK_header *pki ); static void read_system_header( struct ClassBase *cb, struct MPEGSystemInstData *msid, SYSTEM_header *si ); static void read_packet_header( struct ClassBase *cb, struct MPEGSystemInstData *msid, PACKET_header *pi ); static void print_pack_header( struct ClassBase *cb, struct MPEGSystemInstData *msid, PACK_header *pki ); static void print_system_header( struct ClassBase *cb, struct MPEGSystemInstData *msid, SYSTEM_header *si ); static void print_packet_header( struct ClassBase *cb, struct MPEGSystemInstData *msid, PACKET_header *pi ); static void exitdemux( struct ClassBase *cb, struct MPEGSystemInstData *msid, LONG result, LONG result2 ); static void demux( struct ClassBase *cb, struct MPEGSystemInstData *msid, BPTR file ); /* class related */ static BOOL ScanFrames( struct ClassBase *, Object * ); static void mysprintf( struct ClassBase *, STRPTR, STRPTR, ... ); static ULONG SaveMPEGSystem( struct ClassBase *cb, struct IClass *cl, Object *o, struct dtWrite *dtw ); /*****************************************************************************/ /* Create "mpegsystem.datatype" BOOPSI class */ struct IClass *initClass( struct ClassBase *cb ) { struct IClass *cl; /* Create our class... */ if( cl = MakeClass( MPEGSYSTEMDTCLASS, ANIMATIONDTCLASS, NULL, (ULONG)sizeof( struct MPEGSystemInstData ), 0UL ) ) { #define DTSTACKSIZE (16384UL) cl -> cl_Dispatcher . h_Entry = (HOOKFUNC)StackSwapDispatch; /* see stackswap.c */ cl -> cl_Dispatcher . h_SubEntry = (HOOKFUNC)Dispatch; /* see stackswap.c */ cl -> cl_Dispatcher . h_Data = (APTR)DTSTACKSIZE; /* see stackswap.c */ cl -> cl_UserData = (ULONG)cb; AddClass( cl ); } return( cl ); } /*****************************************************************************/ /* class dispatcher */ DISPATCHERFLAGS ULONG Dispatch( REGA0 struct IClass *cl, REGA2 Object *o, REGA1 Msg msg ) { struct ClassBase *cb = (struct ClassBase *)(cl -> cl_UserData); struct MPEGSystemInstData *msid; ULONG retval = 0UL; switch( msg -> MethodID ) { /****** mpegsystem.datatype/OM_NEW ******************************************* * * NAME * OM_NEW -- Create a mpegsystem.datatype object. * * FUNCTION * The OM_NEW method is used to create an instance of the * mpegsystem.datatype class. This method is passed to the superclass * first. After this, mpegsystem.datatype parses the prefs file and * makes a scan through the system stream to get index information * about the single system stream packets. * After all, the mpegsystem.datatype starts two objects which reads * the single video and audio streams trougth an internal * "demultiplexer" (system stream splitter) filesystem. * * Subclasses of mpegsystem.datatype are not supported. Any attempt to * create a subclass object of mpegsystem.datatype will be rejected by * this method. * * ATTRIBUTES * The following attributes can be specified at creation time. * * DTA_SourceType (ULONG) -- Determinates the type of DTA_Handle * attribute. Only DTST_FILE is supported. * If any other type was set in a given DTA_SourceType, * OM_NEW will be rejected. * Defaults to DTST_FILE. * * DTA_Handle -- For DTST_FILE, a BPTR filehandle is expected. This * handle will be created by datatypesclass depeding on the DTF_#? * flag, which is DTF_BINARY here. DTST_FILE, datatypesclass * creates a file handle from the given DTA_Name and DTA_Handle * (a BPTR returned by Lock). * A DTST_RAM (create empty object) source type requires a NULL * handle. * * RESULT * If the object was created a pointer to the object is returned, * otherwise NULL is returned. * ****************************************************************************** * */ case OM_NEW: { struct TagItem *ti; /* We only support DTST_FILE or DTST_RAM as source type */ if( ti = FindTagItem( DTA_SourceType, (((struct opSet *)msg) -> ops_AttrList) ) ) { if( ((ti -> ti_Data) != DTST_FILE) #ifdef HAS_ENCODER && ((ti -> ti_Data) != DTST_RAM) #endif /* HAS_ENCODER */ ) { SetIoErr( ERROR_OBJECT_WRONG_TYPE ); break; } } #ifndef HAS_ENCODER /* This must not be a subclass of mpegsystem.datatype * (not implemented yet) */ if( o == (Object *)cl ) #endif /* !HAS_ENCODER */ { if( retval = DoSuperMethodA( cl, o, msg ) ) { /* Load/scan frames... */ if( !ScanFrames( cb, (Object *)retval ) ) { /* Something went fatally wrong, dispose object */ CoerceMethod( cl, (Object *)retval, OM_DISPOSE ); retval = 0UL; } } } #ifndef HAS_ENCODER else { /* Subclasses of mpegsystem.datatype are not implemented */ SetIoErr( ERROR_NOT_IMPLEMENTED ); } #endif /* !HAS_ENCODER */ } break; /****** mpegsystem.datatype/OM_DISPOSE *************************************** * * NAME * OM_DISPOSE -- Delete a mpegsystem.datatype object. * * FUNCTION * The OM_DISPOSE method is used to delete an instance of the * mpegsystem.datatype class. This method is passed to the superclass * when it has completed. * * RESULT * The object is deleted. 0UL is returned. * ****************************************************************************** * */ case OM_DISPOSE: { LONG saved_ioerr = IoErr(); /* Preserve I/O error */ /* Get a pointer to our object data */ msid = (struct MPEGSystemInstData *)INST_DATA( cl, o ); /* Wait for any outstanding blitter usage (which may use one of our bitmaps) */ WaitBlit(); /* Dispose the current audio and video objects */ DisposeDTObject( (msid -> msid_CurrVideo) ); DisposeDTObject( (msid -> msid_CurrAudio) ); /* Kill our virtual demux handler */ KillHandler( cb, msid ); /* Delete the frame pool */ DeletePool( (msid -> msid_Pool) ); /* Close verbose output file */ if( (msid -> msid_VerboseOutput) && ((msid -> msid_VerboseOutput) != -1L) ) { Close( (msid -> msid_VerboseOutput) ); } /* Dispose object */ DoSuperMethodA( cl, o, msg ); /* Restore I/O error */ SetIoErr( saved_ioerr ); } break; case OM_UPDATE: { if( DoMethod( o, ICM_CHECKLOOP ) ) { break; } } case OM_SET: { /* Pass the attributes to the animation class and force a refresh if we need it */ if( retval = DoSuperMethodA( cl, o, msg ) ) { /* The following statement is commented out because mpegsystem.datatype does not allow * subclasses when the executable was compiled without the HAS_ENCODER define. Thus, the * following statement is NOP unless subclasses are supported... */ #ifdef HAS_ENCODER /* Top instance ? */ if( OCLASS( o ) == cl ) #endif /* HAS_ENCODER */ { struct RastPort *rp; /* Get a pointer to the rastport */ if( rp = ObtainGIRPort( (((struct opSet *)msg) -> ops_GInfo) ) ) { struct gpRender gpr; /* Force a redraw */ gpr . MethodID = GM_RENDER; gpr . gpr_GInfo = ((struct opSet *)msg) -> ops_GInfo; gpr . gpr_RPort = rp; gpr . gpr_Redraw = GREDRAW_UPDATE; DoMethodA( o, (Msg)(&gpr) ); /* Release the temporary rastport */ ReleaseGIRPort( rp ); /* We did an update... */ retval = 0UL; } } } } break; /****** mpegsystem.datatype/DTM_WRITE ******************************************* * * NAME * DTM_WRITE -- Save data * * FUNCTION * This method saves the object's contents to disk. * * If dtw_Mode is DTWM_IFF, the method is passed unchanged to the * superclass, animation.datatype, which writes a single IFF ILBM * picture. * * If dtw_mode is DTWM_RAW, the object saved an MPEG System stream to * the filehandle given, starting with the current frame until * the end is reached. * The sequence saved can be controlled by the ADTA_Frame, ADTA_Frames * and ADTA_FrameIncrement attributes (see TAGS section below). * * TAGS * When writing the local ("raw") format, MPEG System movie, the * following attributes are recognized: * * ADTA_Frame (ULONG) - start frame, saving starts here. * Defaults to the current frame displayed. * * ADTA_Frames (ULONG) - the number of frames to be saved, * Defaults to (max_num_of_frames - curr_frame). * * ADTA_FrameIncrement (ULONG) - frame increment when saving. * Defaults to 1, which means: "jump to next frame". * * NOTE * This function is not implemented yet. A possible implementation * would implement ACTION_WRITE in the virtial implementation and uses * mpegvideo.datatype and mpegaudio.datatype encoders... * * RESULT * Returns 0 for failure (IoErr() returns result2), non-zero * for success. * ****************************************************************************** * */ case DTM_WRITE: { struct dtWrite *dtw; dtw = (struct dtWrite *)msg; /* Local data format (MPEG System) requested ? */ if( (dtw -> dtw_Mode) == DTWM_RAW ) { retval = SaveMPEGSystem( cb, cl, o, dtw ); } else { /* Pass msg to superclass (which writes a single frame as an IFF ILBM picture)... */ retval = DoSuperMethodA( cl, o, msg ); } } break; /****** mpegsystem.datatype/ADTM_LOADFRAME *********************************** * * NAME * ADTM_LOADFRAME -- Load frame * * FUNCTION * The ADTM_LOADFRAME method is used to obtain the bitmap and timing * data of the animation. * The method is passed to the embedded mpegvideo.datatype object. * If successfull, the sample data of struct adtFrame are replaced * by the corresponsing audio data from the embedded * mpegaudio.datatype object. * * RESULT * Returns the result from the embedded mpegvideo.datatype object * (including Result2). * ****************************************************************************** * */ case ADTM_LOADFRAME: { struct adtFrame *alf = (struct adtFrame *)msg; /* Get a pointer to our object data */ msid = (struct MPEGSystemInstData *)INST_DATA( cl, o ); if( msid -> msid_CurrVideo ) { if( retval = DoMethodA( (msid -> msid_CurrVideo), msg ) ) { /* Add here the audio part.. * A better way would be to send SDTM_LOADSAMPLE to load the sample * fragment */ if( msid -> msid_Sample ) { UBYTE *sample = msid -> msid_Sample; ULONG sample_offset = (alf -> alf_Frame) * (msid -> msid_SamplesPerFrame); ULONG len = ((alf -> alf_Duration) + 1UL) * (msid -> msid_SamplesPerFrame); /* Sample completely out-of-range ? */ if( sample_offset >= (msid -> msid_SampleLength) ) { /* No sample data ! */ sample = NULL; sample_offset = 0UL; len = 0UL; } else { /* Sample partial out of range ? */ if( (sample_offset + len) > (msid -> msid_SampleLength) ) { /* Cut it ! */ len -= ((sample_offset + len) - (msid -> msid_SampleLength)); } } /* Fill in the message body */ alf -> alf_Sample = sample + sample_offset; alf -> alf_SampleLength = len; alf -> alf_Period = msid -> msid_Period; } } } else { /* No mpegvideo.datatype object (Should not occur, but...). */ SetIoErr( ERROR_OBJECT_NOT_FOUND ); } } break; /****** mpegsystem.datatype/ADTM_UNLOADFRAME ************************************ * * NAME * ADTM_UNLOADFRAME -- Unload frame contents * * FUNCTION * The ADTM_UNLOADFRAME method is used to release the contents of a * animation frame. * * This method is passed to the embedded mpegvideo.datatype object. * * RESULT * Returns the result from the embedded mpegvideo.datatype object. * ****************************************************************************** * */ case ADTM_UNLOADFRAME: { /* Get a pointer to our object data */ msid = (struct MPEGSystemInstData *)INST_DATA( cl, o ); if( msid -> msid_CurrVideo ) { retval = DoMethodA( (msid -> msid_CurrVideo), msg ); /* Here we should do an SDTM_UNLOADSAMPLE if the sample data were * obtained using SDTM_LOADSAMPLE */ } } break; /* Let the superclass handle everything else */ default: { retval = DoSuperMethodA( cl, o, msg ); } break; } return( retval ); } static BOOL ScanFrames( struct ClassBase *cb, Object *o ) { struct MPEGSystemInstData *msid = (struct MPEGSystemInstData *)INST_DATA( (cb -> cb_Lib . cl_Class), o ); BOOL success = FALSE; LONG error = 0L; InitSemaphore( (&(msid -> msid_SigSem)) ); /* Create a memory pool for frame nodes */ if( msid -> msid_Pool = CreatePool( MEMF_PUBLIC, 8192UL, 8192UL ) ) { BPTR fh; /* handle (file handle) */ ULONG sourcetype; /* type of stream (either DTST_FILE or DTST_RAM) */ /* Prefs defaults */ /* Read prefs */ ReadENVPrefs( cb, msid ); /* Get file handle, handle type and BitMapHeader */ if( GetDTAttrs( o, DTA_SourceType, (&sourcetype), DTA_Handle, (&fh), DTA_Name, (&(msid -> msid_ProjectName)), TAG_DONE ) == 3UL ) { switch( sourcetype ) { case DTST_FILE: { /* we have the filehandle - anything what we want... */ } break; #ifdef HAS_ENCODER case DTST_RAM: { /* do nothing */ } break; #endif /* HAS_ENCODER */ default: { /* unsupported source type */ error = ERROR_NOT_IMPLEMENTED; } break; } /* Any error ? */ if( error == 0L ) { if( fh ) { /* Run system-stream demultiplexer... */ demux( cb, msid, fh ); /* ...success ? */ if( msid -> Handler . Process ) { BPTR v_lock; /* Get first video stream */ if( v_lock = GetStreamLock( cb, msid, 0UL, FALSE ) ) { if( msid -> msid_CurrVideo = NewDTObject( NULL, DTA_SourceType, DTST_FILE, DTA_Handle, v_lock, DTA_GroupID, GID_ANIMATION, TAG_DONE ) ) { ULONG video_modeid; ULONG *video_cregs; struct ColorRegister *video_cm; ULONG video_numcolors; ULONG video_animwidth, video_animdepth, video_animheight; ULONG video_frame, video_numframes, video_fps = 0UL, video_tpf = 0UL; struct BitMap *video_keyframe; if( GetDTAttrs( (msid -> msid_CurrVideo), ADTA_ModeID, (&video_modeid), ADTA_CRegs, (&video_cregs), ADTA_ColorRegisters, (&video_cm), ADTA_NumColors, (&video_numcolors), ADTA_Width, (&video_animwidth), ADTA_Height, (&video_animheight), ADTA_Depth, (&video_animdepth), ADTA_Frame, (&video_frame), ADTA_Frames, (&video_numframes), XTAG( !ISV41, ADTA_FramesPerSecond ), (&video_fps), XTAG( ISV41, ADTA_TicksPerFrame ), (&video_tpf), ADTA_KeyFrame, (&video_keyframe), TAG_DONE ) == 11UL ) { /* This should NEVER fail, but... */ if( video_numframes && video_keyframe && (video_fps || video_tpf) ) { ULONG *cregs; struct ColorRegister *cm; ULONG numcolors; SetDTAttrs( o, NULL, NULL, ADTA_NumColors, video_numcolors, TAG_DONE ); if( GetDTAttrs( o, ADTA_CRegs, (&cregs), ADTA_ColorRegisters, (&cm), ADTA_NumColors, (&numcolors), TAG_DONE ) == 3UL ) { /* Check if we got memory for the palette (if we have one) */ if( (cregs && cm && (numcolors == video_numcolors)) || (video_numcolors == 0UL) ) { BPTR a_lock; /* Copy base palette (if we have one) */ if( video_numcolors ) { CopyMem( video_cregs, cregs, (video_numcolors * 3UL * sizeof( ULONG )) ); CopyMem( video_cm, cm, (video_numcolors * 3UL * sizeof( struct ColorRegister )) ); } msid -> msid_TicksPerFrame = ((ISV41)?(video_tpf):(TICK_FREQ / video_fps)); SetDTAttrs( o, NULL, NULL, DTA_ObjName, (msid -> msid_ProjectName), ADTA_ModeID, video_modeid, ADTA_Width, video_animwidth, ADTA_Height, video_animheight, ADTA_Depth, video_animdepth, ADTA_Frame, video_frame, ADTA_Frames, video_numframes, XTAG( !ISV41, ADTA_FramesPerSecond ), video_fps, XTAG( ISV41, ADTA_TicksPerFrame ), video_tpf, ADTA_KeyFrame, video_keyframe, TAG_DONE ); /* Get first audio stream */ if( a_lock = GetStreamLock( cb, msid, 0UL, TRUE ) ) { if( msid -> msid_CurrAudio = NewDTObject( NULL, DTA_SourceType, DTST_FILE, DTA_Handle, a_lock, DTA_GroupID, GID_SOUND, TAG_DONE ) ) { ULONG volume; GetDTAttrs( (msid -> msid_CurrAudio), SDTA_Sample, (&(msid -> msid_Sample)), SDTA_SampleLength, (&(msid -> msid_SampleLength)), SDTA_Period, (&(msid -> msid_Period)), SDTA_Volume, (&volume), TAG_DONE ); msid -> msid_SamplesPerFrame = ((SysBase -> ex_EClockFrequency) * 10UL) / ((msid -> msid_Period) * (TICK_FREQ / (msid -> msid_TicksPerFrame)) * 2UL); SetDTAttrs( o, NULL, NULL, ADTA_Sample, (msid -> msid_Sample), ADTA_SampleLength, (msid -> msid_SamplesPerFrame), ADTA_Period, (msid -> msid_Period), ADTA_Volume, volume, TAG_DONE ); success = TRUE; } else { /* NewDTObjectA failed */ error = IoErr(); } } else { /* No audio lock */ error = IoErr(); } } else { /* no palette memory */ error = ERROR_NO_FREE_STORE; } } else { /* We did not get all attributes we need... */ error = ERROR_OBJECT_WRONG_TYPE; } } } else { /* We did not get all attributes we need... */ error = ERROR_OBJECT_WRONG_TYPE; } } else { /* NewDTObject failed */ error = IoErr(); } } else { /* no video stream lock */ error = IoErr(); } } else { /* demuxer failed */ error = msid -> Demux . retval2; } } else { /* No file handle ? - Be sure we got a DTST_RAM sourcetype */ if( sourcetype == DTST_RAM ) { success = TRUE; } else { /* No handle ! */ error = ERROR_REQUIRED_ARG_MISSING; } } } } else { /* can't get required attributes from superclass */ error = ERROR_OBJECT_WRONG_TYPE; } } else { /* no memory pool */ error = ERROR_NO_FREE_STORE; } SetIoErr( error ); return( success ); } /*****************************************************************************/ void OpenLogfile( struct ClassBase *cb, struct MPEGSystemInstData *msid ) { if( ((msid -> msid_VerboseOutput) == NULL) || ((msid -> msid_VerboseOutput) == -1L) ) { STRPTR confile; if( confile = (STRPTR)AllocVec( (((msid -> msid_ProjectName)?(strlen( (msid -> msid_ProjectName) )):(0UL)) + 100UL), MEMF_PUBLIC ) ) { mysprintf( cb, confile, "CON:////MPEG System DataType %s/auto/wait/close/inactive", ((msid -> msid_ProjectName)?(FilePart( (msid -> msid_ProjectName) )):(NULL)) ); msid -> msid_VerboseOutput = Open( confile, MODE_READWRITE ); FreeVec( confile ); } } } static void mysprintf( struct ClassBase *cb, STRPTR buffer, STRPTR fmt, ... ) { APTR args; args = (APTR)((&fmt) + 1); RawDoFmt( fmt, args, (void (*))"\x16\xc0\x4e\x75", buffer ); } void error_printf( struct ClassBase *cb, struct MPEGSystemInstData *msid, STRPTR format, ... ) { OpenLogfile( cb, msid ); if( (msid -> msid_VerboseOutput) && ((msid -> msid_VerboseOutput) != -1L) ) { VFPrintf( (msid -> msid_VerboseOutput), format, (APTR)((&format) + 1) ); } } void syntax_printf( struct ClassBase *cb, struct MPEGSystemInstData *msid, STRPTR format, ... ) { if( msid -> msid_DoSyntax ) { OpenLogfile( cb, msid ); if( (msid -> msid_VerboseOutput) && ((msid -> msid_VerboseOutput) != -1L) ) { VFPrintf( (msid -> msid_VerboseOutput), format, (APTR)((&format) + 1) ); } } } void debug_printf( struct ClassBase *cb, struct MPEGSystemInstData *msid, STRPTR format, ... ) { if( msid -> msid_DoDebug ) { OpenLogfile( cb, msid ); if( (msid -> msid_VerboseOutput) && ((msid -> msid_VerboseOutput) != -1L) ) { VFPrintf( (msid -> msid_VerboseOutput), format, (APTR)((&format) + 1) ); } } } void verbose_printf( struct ClassBase *cb, struct MPEGSystemInstData *msid, STRPTR format, ... ) { if( (msid -> msid_VerboseOutput) && ((msid -> msid_VerboseOutput) != -1L) ) { VFPrintf( (msid -> msid_VerboseOutput), format, (APTR)((&format) + 1) ); } } static ULONG SaveMPEGSystem( struct ClassBase *cb, struct IClass *cl, Object *o, struct dtWrite *dtw ) { ULONG retval = 0UL; LONG error /*= 0L*/; #ifdef HAS_ENCODER /* A NULL file handle is a nop (GMultiView uses this to test if a datatype supports RAW writing) */ if( dtw -> dtw_FileHandle ) { struct MPEGSystemInstData *msid = (struct MPEGSystemInstData *)INST_DATA( cl, o ); ULONG modeid; ULONG *cregs; ULONG numcolors; ULONG startframe = 0UL, numframes = 0UL, framestep = 1UL; ULONG fps = 0UL; struct BitMap *keyframe; ULONG animwidth, animheight, animdepth; if( GetDTAttrs( o, ADTA_ModeID, (&modeid), ADTA_CRegs, (&cregs), ADTA_NumColors, (&numcolors), ADTA_Width, (&animwidth), ADTA_Height, (&animheight), ADTA_Depth, (&animdepth), ADTA_Frame, (&startframe), ADTA_Frames, (&numframes), ADTA_FramesPerSecond, (&fps), ADTA_KeyFrame, (&keyframe), TAG_DONE ) == 10UL ) { struct TagItem *tstate, *ti; numframes -= startframe; tstate = dtw -> dtw_AttrList; while( ti = NextTagItem( (&tstate) ) ) { switch( ti -> ti_Tag ) { case ADTA_Frame: startframe = ti -> ti_Data; break; case ADTA_Frames: numframes = ti -> ti_Data; break; case ADTA_FrameIncrement: framestep = ti -> ti_Data; break; } } if( framestep == 0UL ) framestep = 1UL; verbose_printf( cb, msid, "saving mpeg system movie %lu %lu %lu\n", startframe, numframes, framestep ); /* here should follow the encoder part... */ } else { error_printf( cb, msid, "not enougth attributes\n" ); } } #else error = ERROR_NOT_IMPLEMENTED; /* no encoder yet */ #endif /* HAS_ENCODER */ SetIoErr( error ); return( retval ); } /*****************************************************************************/ static UBYTE *get_buf_data( struct ClassBase *cb, struct MPEGSystemInstData *msid, long read_len ) { long len_left; long len_read; long temp1; UBYTE *buf_ptr; /* Calculate how much data is left in the buffer */ len_left = (msid -> Demux . raw_data_buf_len) - ((msid -> Demux . raw_data_buf_ptr) - (msid -> Demux . raw_data_buf)); /* Not enough for the calling function's needs */ if( len_left < read_len ) { /* There is some data left, so copy to start of buffer */ if( len_left > 0 ) { memcpy( (msid -> Demux . raw_data_buf), (msid -> Demux . raw_data_buf_ptr), (size_t)len_left ); } msid -> Demux . raw_data_buf_ptr = &msid -> Demux . raw_data_buf[ 0 ]; temp1 = MAX_DATA_BUF_LEN - len_left; /* To fill the rest of the buffer */ /* block pos */ msid -> Demux . curr_file_pos = msid -> Demux . fdin_pos; /* Get file pos */ msid -> Demux . curr_file_pos_in_buffer = ((msid -> Demux . raw_data_buf_ptr) + len_left); debug_printf( cb, msid, "read: %ld, len %ld, left %ld\n", (LONG)(msid -> Demux . curr_file_pos), (LONG)temp1, (LONG)len_left ); len_read = Read( (msid -> Demux . fdin), (msid -> Demux . curr_file_pos_in_buffer), (LONG)temp1 ); if( len_read == -1L ) { LONG err = IoErr(); error_printf( cb, msid, "Error: reading system file\n" ); exitdemux( cb, msid, RETURN_FAIL, err ); } else { msid -> Demux . fdin_pos += len_read; } /* no data left in file - data should never have been requested */ if( len_read == 0 ) { error_printf( cb, msid, "Error: reached EOF, requested %ld bytes\n", temp1 ); exitdemux( cb, msid, RETURN_FAIL, DTERROR_NOT_ENOUGH_DATA ); } msid -> Demux . raw_data_buf_len = len_left + len_read; /* Read done to end of file but still not enough data to complete request */ if( (msid -> Demux . raw_data_buf_len) < read_len ) { error_printf( cb, msid, "Error: insufficient data for read\n" ); exitdemux( cb, msid, RETURN_FAIL, DTERROR_NOT_ENOUGH_DATA ); } } buf_ptr = msid -> Demux . raw_data_buf_ptr; /* For return to calling function. */ msid -> Demux . raw_data_buf_ptr += read_len; /* Global advanced for use at next call. */ return( buf_ptr ); } static UBYTE *calc_time_stamp( struct ClassBase *cb, struct MPEGSystemInstData *msid, UBYTE *buf_ptr, long *time_stamp ) { /* Determine Time Stamp * Contents: * Byte 0: 4 bits: depend on SCR/PTS/DTS * 3 bits: Time32..30, * 1 bit marker:1 * Byte 1: 8 bits Time29..22. * Byte 2: 7 bits Time21..15, * 1 bit marker * Byte 3: 8 bits Time14..7. * Byte 4: 7 bits Time6..0, * 1 bit marker */ *time_stamp = ((((long)(*buf_ptr)) & 0x0E) << 29); /* Marker_bit check */ if( (*buf_ptr & (UBYTE)0x01) != (UBYTE)0x01 ) { syntax_printf( cb, msid, "Expecting marker_bit value '1' at calc_time_stamp A.\n" ); exitdemux( cb, msid, RETURN_FAIL, DTERROR_INVALID_DATA ); } buf_ptr++; *time_stamp |= ((((long)(*buf_ptr)) & 0xFF) << 22); buf_ptr++; *time_stamp |= ((((long)(*buf_ptr)) & 0xFE) << 14); /* Marker_bit check */ if( (*buf_ptr & (UBYTE)0x01) != (UBYTE)0x01 ) { syntax_printf( cb, msid, "Expecting marker_bit value '1' at calc_time_stamp B.\n" ); exitdemux( cb, msid, RETURN_FAIL, DTERROR_INVALID_DATA ); } buf_ptr++; *time_stamp |= ((((long)(*buf_ptr)) & 0xFF) << 7); buf_ptr++; *time_stamp |= ((((long)(*buf_ptr)) & 0xFE) >> 1); /* Marker_bit check */ if( (*buf_ptr & (UBYTE)0x01) != (UBYTE)0x01 ) { syntax_printf( cb, msid, "Expecting marker_bit value '1' at calc_time_stamp C.\n" ); exitdemux( cb, msid, RETURN_FAIL, DTERROR_INVALID_DATA ); } buf_ptr++; return( buf_ptr ); } static UBYTE get_next_start_code( struct ClassBase *cb, struct MPEGSystemInstData *msid ) { UBYTE *buf_ptr = NULL; /* dead assignment, but avoids SAS/C "Warning 317: possibly uninitialized variable" */ UWORD zeros; /* Scan for start code; should be hex 00 00 01 for Pack Start Code, * System Start Code, Packet Start Code or ISO_11172_end_code. * Leading zeros are ignored. */ for( ;; ) { zeros = 0; for( ;; ) { buf_ptr = get_buf_data( cb, msid, 1 ); if( *buf_ptr == 0x00 ) { zeros++; } else { if( zeros >= 2 ) { if( *buf_ptr != 0x01 ) { zeros = 0; } else { break; } } } } buf_ptr = get_buf_data( cb, msid, 1 ); if( (msid -> Demux . system_found) || (*buf_ptr == 0xBB) ) { break; } } switch( *buf_ptr ) { case (UBYTE)0xB9: return( (UBYTE)ISO_11172_END_CODE ); case (UBYTE)0xBA: return( (UBYTE)PACK_START_CODE ); case (UBYTE)0xBB: { msid -> Demux . system_found = TRUE; verbose_printf( cb, msid, "system start\n" ); return( (UBYTE)SYSTEM_START_CODE ); } } return( *buf_ptr ); /* It must be a stream_id. */ } static void read_pack_header( struct ClassBase *cb, struct MPEGSystemInstData *msid, PACK_header *pki ) { UBYTE *buf_ptr; pki -> SCR = 0; buf_ptr = get_buf_data( cb, msid, PACK_HEADER_LENGTH ); /* Determine System Clock Reference (SCR) * Check marker_bits: '0010' = 0x2 */ if( (*buf_ptr & (UBYTE)0xF0) != (UBYTE)0x20 ) { syntax_printf( cb, msid, "Expecting '0010' after pack_start_code.\n" ); exitdemux( cb, msid, RETURN_FAIL, DTERROR_INVALID_DATA ); } buf_ptr = calc_time_stamp( cb, msid, buf_ptr, (&(pki -> SCR)) ); /* Determine Mux Rate * Contents: * Byte 5: 1 bit marker, * 7 bits mux_rate. * Byte 6: 8 bits mux_rate. * Byte 7: 7 bits mux_rate, * 1 bit marker */ pki -> mux_rate = ((((long)(*buf_ptr)) & 0x7F) << 14); /* Marker_bit check */ if( (*buf_ptr & (UBYTE)0x80) != (UBYTE)0x80 ) { syntax_printf( cb, msid, "byte= %lx.\n", *buf_ptr ); syntax_printf( cb, msid, "Expecting marker_bit value '1' at read_pack_header A.\n" ); exitdemux( cb, msid, RETURN_FAIL, DTERROR_INVALID_DATA ); } buf_ptr++; pki -> mux_rate |= ((((long)(*buf_ptr)) & 0xFF) << 7); buf_ptr++; pki -> mux_rate |= ((((long)(*buf_ptr)) & 0xFE) >> 1); /* Marker_bit check */ if( (*buf_ptr & (UBYTE)0x01) != (UBYTE)0x01 ) { syntax_printf( cb, msid, "Expecting marker_bit value '1' at read_pack_header B.\n" ); exitdemux( cb, msid, RETURN_FAIL, DTERROR_INVALID_DATA ); } } static void read_system_header( struct ClassBase *cb, struct MPEGSystemInstData *msid, SYSTEM_header *si ) { UBYTE *buf_ptr; long j; UBYTE test; /* Read System Header Length: 2 Bytes after start code. * Length of header after header length bytes. * Bytes 0 & 1: 8 bits header_length--high & low */ buf_ptr = get_buf_data( cb, msid, 2 ); si -> header_length = (ULONG)(((long)(*buf_ptr)) << 8); buf_ptr++; si -> header_length |= (ULONG)(((long)(*buf_ptr)) & 0xFF); /* Read the rest of the header */ buf_ptr = get_buf_data( cb, msid, (si -> header_length) ); /* Byte 0: 1 bit marker, * 7 bits rate_bound--high */ si -> rate_bound = (ULONG)((((long)*buf_ptr) & 0x7F) << 15); /* Marker bit check */ if( (*buf_ptr & (UBYTE)0x80) != (UBYTE)0x80 ) { syntax_printf( cb, msid, "Expecting marker_bit value '1' before rate_bound--high.\n" ); exitdemux( cb, msid, RETURN_FAIL, DTERROR_INVALID_DATA ); } buf_ptr++; /* Byte 1: 8 bits rate_bound--mid */ si -> rate_bound += (ULONG)((((long)*buf_ptr) & 0xFF) << 7); buf_ptr++; /* Byte 2: 7 bits rate_bound-low, * 1 bit marker */ si -> rate_bound += (ULONG)((((long)*buf_ptr) & 0xFE) >> 1); /* Marker bit check */ if( (*buf_ptr & (UBYTE)0x01) != (UBYTE)0x01 ) { syntax_printf( cb, msid, "Expecting marker_bit value '1' after rate_bound.\n" ); exitdemux( cb, msid, RETURN_FAIL, DTERROR_INVALID_DATA ); } buf_ptr++; /* Byte 3: 6 bits audio_bound, * 1 bit fixed_flag, * 1bit CSPS_flag */ si -> audio_bound = (ULONG)((((long)*buf_ptr) & 0xFF) >> 2); si -> fixed_flag = (BOOL)((((long)*buf_ptr) & 0x02) >> 1); si -> CSPS_flag = (BOOL) (((long)*buf_ptr) & 0x01); buf_ptr++; /* Byte 4: 1b system_audio_lock_flag, * 1b system_video_lock_flag, * 1b marker, * 5b video_bound */ si -> system_audio_lock_flag = (BOOL)((((long)*buf_ptr) & 0x80) >> 7); si -> system_video_lock_flag = (BOOL)((((long)*buf_ptr) & 0x40) >> 6); si -> video_bound = (ULONG) (((long)*buf_ptr) & 0x1F); /* Marker bit check */ if( (*buf_ptr & (UBYTE)0x20) != (UBYTE)0x20 ) { syntax_printf( cb, msid, "Expecting marker_bit value '1' after system_video_lock_flag.\n" ); exitdemux( cb, msid, RETURN_FAIL, DTERROR_INVALID_DATA ); } buf_ptr++; if( *buf_ptr != (UBYTE)0xFF ) { syntax_printf( cb, msid, "Reserved byte not set to default\n" ); exitdemux( cb, msid, RETURN_FAIL, DTERROR_INVALID_DATA ); } buf_ptr++; if( (si -> header_length) == 6 ) { return; } j = 0; while( (ULONG)buf_ptr < (ULONG)(msid -> Demux . raw_data_buf_ptr) ) { /* All lmntry stream_id's ... */ test = (*buf_ptr & (UBYTE)0x80); if( test == 0 ) { error_printf( cb, msid, "system header length incorrect\n" ); exitdemux( cb, msid, RETURN_FAIL, DTERROR_INVALID_DATA ); } si -> STD_buffer_info[ j ] . stream_id = (*buf_ptr & (UBYTE)0xFF); buf_ptr++; /* Check marker_bits */ if( (*buf_ptr & (UBYTE)0xC0) != (UBYTE)0xC0 ) { syntax_printf( cb, msid, "Expecting placeholder bit values '11' after stream_id.\n" ); exitdemux( cb, msid, RETURN_FAIL, DTERROR_INVALID_DATA ); } si -> STD_buffer_info[ j ] . STD_buffer_bound_scale = (*buf_ptr & (UBYTE)0x20) >> 5; si -> STD_buffer_info[ j ] . STD_buffer_size_bound = (*buf_ptr & (UBYTE)0x1F) << 8; buf_ptr++; si -> STD_buffer_info[ j ] . STD_buffer_size_bound |= *buf_ptr & (UBYTE)0xFF; buf_ptr++; j++; } } static void read_packet_header( struct ClassBase *cb, struct MPEGSystemInstData *msid, PACKET_header *pi ) { UBYTE *buf_ptr; UBYTE test, test1; long i; pi -> PTS = 0; pi -> DTS = 0; /* read packet length */ buf_ptr = get_buf_data( cb, msid, 2 ); /* Bytes 0 & 1: 8 bits packet_length -- high & low */ pi -> packetlength = (ULONG)(((long)*buf_ptr) << 8); buf_ptr++; pi -> packetlength |= (ULONG)(((long)*buf_ptr) & 0xFF); /* Get the remainder of the packet. */ buf_ptr = get_buf_data( cb, msid, (pi -> packetlength) ); /* private stream 2 */ if( (pi -> stream_id) <= (UBYTE)0xBF ) { pi -> packet_ptr = buf_ptr; return; } /* Skip over any stuffing Bytes 1111 1111 (16 max) * Count to 17 to see if there are more than allowed in the spec. */ i = 0; while( (*buf_ptr == (UBYTE)0xFF) && (i < 17) ) { buf_ptr++; pi -> packetlength--; i++; } if( i == 17 ) { error_printf( cb, msid, "Too many stuffing bytes after packet_length\n" ); exitdemux( cb, msid, RETURN_FAIL, DTERROR_INVALID_DATA ); } /* If nextbits =='01' read STD_buffer_scale & _size * Byte: 2b '01', * 1b STD_buffer_scale, * 5b STD_buffer_size-hi * Byte: 8 bits STD_buffer_size--lo */ test1 = *buf_ptr & (UBYTE)0xC0; if( test1 == (UBYTE)0x40 ) { /* read STD values */ pi -> STD_buffer_scale = (*buf_ptr & (UBYTE)0x20) >> 5; pi -> STD_buffer_size = (*buf_ptr & (UBYTE)0x1F) << 8; buf_ptr++; pi -> packetlength--; pi -> STD_buffer_size |= (*buf_ptr & (UBYTE)0xFF); buf_ptr++; pi -> packetlength--; } /* Determine whether to read in PTS, PTS & DTS, or neither before data. */ test = (*buf_ptr & (UBYTE)0xF0); switch( test ) { case (UBYTE)0x20: /* Get PTS only */ { buf_ptr = calc_time_stamp( cb, msid, buf_ptr, (&(pi -> PTS)) ); pi -> packetlength -= 5; } break; case (UBYTE)0x30: /* Get PTS & DTS. Both same format as PTS above. * pts and data */ { buf_ptr = calc_time_stamp( cb, msid, buf_ptr, (&(pi -> PTS)) ); /* Get DTS */ if( (*buf_ptr & (UBYTE)0xF0) != (UBYTE)0x10 ) { syntax_printf( cb, msid, "Expecting bits '0001' before DTS in read_packet_header\n" ); exitdemux( cb, msid, RETURN_FAIL, DTERROR_INVALID_DATA ); } buf_ptr = calc_time_stamp( cb, msid, buf_ptr, (&(pi -> DTS)) ); pi -> packetlength -= 10; } break; case (UBYTE)0x00: { if( *buf_ptr != (UBYTE)0x0F ) { error_printf( cb, msid, "not a valid packet time sequence\n" ); exitdemux( cb, msid, RETURN_FAIL, DTERROR_INVALID_DATA ); } buf_ptr++; pi -> packetlength--; } break; default: { error_printf( cb, msid, "invalid time code in packet\n" ); exitdemux( cb, msid, RETURN_FAIL, DTERROR_INVALID_DATA ); } break; } /* packetlength should have been properly set by the above */ pi -> packet_ptr = buf_ptr; } static void print_pack_header( struct ClassBase *cb, struct MPEGSystemInstData *msid, PACK_header *pki ) { long mux_byte_rate = (pki -> mux_rate) * 50; verbose_printf( cb, msid, "PACK HEADER: SCR = %ld, Mux Rate = %ld, or %ld Bytes per second\n", (LONG)(pki -> SCR), (LONG)(pki -> mux_rate), mux_byte_rate ); } static void print_system_header( struct ClassBase *cb, struct MPEGSystemInstData *msid, SYSTEM_header *si ) { long i = 0; long stream_num = 0; long buf_byte_size_bound; UBYTE stream_type = 0; verbose_printf( cb, msid, "SYSTEM HEADER: Hdr Len = %ld, Rate bound = %ld, Audio bound = %ld,\n", (LONG)(si -> header_length), (LONG)(si -> rate_bound), (LONG)(si -> audio_bound) ); verbose_printf( cb, msid, "Fixed flag = %ld, CSPS flag = %ld, Sys audio lock flag = %ld,\n", (LONG)(si -> fixed_flag), (LONG)(si -> CSPS_flag), (LONG)(si -> system_audio_lock_flag) ); verbose_printf( cb, msid, "Sys video lock flag = %ld, Video bound = %ld\n", (LONG)(si -> system_video_lock_flag), (LONG)(si -> video_bound) ); while( si -> STD_buffer_info[ i ] . stream_id != 0 ) { if( ((si -> STD_buffer_info[ i ] . stream_id >> 5) & 0x6) == 0x6 ) { stream_type = 'A'; stream_num = (long)((si -> STD_buffer_info[ i ] . stream_id) & 0x1F); } if( ((si -> STD_buffer_info[ i ] . stream_id >> 4) & 0xE) == 0xE ) { stream_type = 'V'; stream_num = (long)((si -> STD_buffer_info[ i] . stream_id) & 0x0F); } if( si -> STD_buffer_info[ i ] . STD_buffer_bound_scale == 0 ) { buf_byte_size_bound = si -> STD_buffer_info[ i ] . STD_buffer_size_bound * 128; } else { buf_byte_size_bound= si -> STD_buffer_info[ i ] . STD_buffer_size_bound * 1024; } verbose_printf( cb, msid, "STD buf %ld: Stream %lc%ld, Buf bound scale %ld, Buf size bound %ld or %ld bytes\n", i, stream_type, stream_num, (si -> STD_buffer_info[ i ] . STD_buffer_bound_scale), (si -> STD_buffer_info[ i ] . STD_buffer_size_bound), buf_byte_size_bound ); i++; } } static void print_packet_header( struct ClassBase *cb, struct MPEGSystemInstData *msid, PACKET_header *pi ) { long stream_num = 0; UBYTE stream_type = 0; if( ((pi -> stream_id >> 5) & 0x6) == 0x6 ) { stream_type = 'A'; stream_num = (long)((pi -> stream_id) & 0x1F); } if( ((pi -> stream_id >> 4) & 0xE) == 0xE ) { stream_type = 'V'; stream_num = (long)((pi -> stream_id) & 0x0F); } verbose_printf( cb, msid, "PACKET HDR %lc%ld: %ldB, STD buf scale %ld, ..size %ld, PTS %ld, DTS %ld\n", stream_type, stream_num, (pi -> packetlength), (pi -> STD_buffer_scale), (pi -> STD_buffer_size), (pi -> PTS), (pi -> DTS) ); } static void demux( struct ClassBase *cb, struct MPEGSystemInstData *msid, BPTR file ) { PACK_header pack_info; PACK_header *pack_info_p = &pack_info; SYSTEM_header sys_info; SYSTEM_header *sys_info_p = &sys_info; PACKET_header pkt_info; PACKET_header *pkt_info_p = &pkt_info; long i, j; long current_audio = 0; long current_video = 0; long demux_id[ MAX_MPEG_STREAMS ]; UBYTE next_code; /* Alloc input buffer */ if( msid -> Demux . raw_data_buf = (UBYTE *)AllocVec( MAX_DATA_BUF_LEN, MEMF_PUBLIC ) ) { /* Set "point of return" on decoder exit/error */ if( setjmp( (msid -> Demux . exit_buf) ) == 0 ) { /* Init remaining fields */ msid -> Demux . raw_data_buf_len = 0; msid -> Demux . raw_data_buf_ptr = msid -> Demux . raw_data_buf; msid -> Demux . fdin = file; msid -> Demux . fdin_pos = 0L; /* Read and write data. */ for( ;; ) { next_code = get_next_start_code( cb, msid ); verbose_printf( cb, msid, "next_code = %lx\n", (LONG)next_code ); /* next_code identifies whether the stream is at * the beginning of a system stream, a pack, or a packet, * or if it is at the end of a system stream. */ switch( next_code ) { case ((UBYTE)PACK_START_CODE): /* 0xBA */ { read_pack_header( cb, msid, pack_info_p ); print_pack_header( cb, msid, pack_info_p ); } break; case ((UBYTE)SYSTEM_START_CODE): /* 0xBB */ { read_system_header( cb, msid, sys_info_p ); print_system_header( cb, msid, sys_info_p ); msid -> Demux . N = sys_info_p -> audio_bound; msid -> Demux . M = sys_info_p -> video_bound; verbose_printf( cb, msid, " %ld audio, %ld video\n", (msid -> Demux . N), (msid -> Demux . M) ); current_audio = 0; current_video = msid -> Demux . N; for( i = 0 ; i < MAX_MPEG_STREAMS ; i++ ) { demux_id[ i ] = -1; } } break; case ((UBYTE)ISO_11172_END_CODE): /* 0xB9 */ { verbose_printf( cb, msid, "end of system stream reached\n" ); exitdemux( cb, msid, RETURN_OK, 0L ); } break; default: /* PACKET START CODE & stream_id */ { pkt_info_p -> stream_id = next_code; read_packet_header( cb, msid, pkt_info_p ); print_packet_header( cb, msid, pkt_info_p ); /* The stream_id identifies the stream by type and number */ switch( pkt_info_p -> stream_id ) { case( (UBYTE)0xB8 ): /* may need more work */ { /* Following STD_buffer_scale and _size refer to * all audio streams in the muxed stream */ error_printf( cb, msid, "Error handling common audio STD_buffer_scale and _size.\n" ); exitdemux( cb, msid, RETURN_FAIL, DTERROR_UNKNOWN_COMPRESSION ); } break; case( (UBYTE)0xB9 ): /* may need more work */ { /* Following STD_buffer_scale and _size refer to * all video streams in the muxed stream */ error_printf( cb, msid, "Error handling common video STD_buffer_scale and _size.\n" ); exitdemux( cb, msid, RETURN_FAIL, DTERROR_UNKNOWN_COMPRESSION ); } break; case( (UBYTE)0xBC ): { /* Reserved stream: discard */ error_printf( cb, msid, "Received reserved stream\n" ); exitdemux( cb, msid, RETURN_FAIL, DTERROR_UNKNOWN_COMPRESSION ); } break; case( (UBYTE)0xBD ): { /* private_stream_1: discard */ error_printf( cb, msid, "Received private_stream_1\n" ); exitdemux( cb, msid, RETURN_FAIL, DTERROR_UNKNOWN_COMPRESSION ); } break; case( (UBYTE)0xBE ): /* data bytes all FF */ { /* Padding stream: discard */ verbose_printf( cb, msid, "Received padding stream\n" ); } break; case( (UBYTE)0xBF ): { /* private_stream_2: discard */ error_printf( cb, msid, "Received private_stream_2\n" ); exitdemux( cb, msid, RETURN_FAIL, DTERROR_UNKNOWN_COMPRESSION ); } break; default: { /* The stream is an audio, video, or reserved_data stream. * Convert stream_id to C0 to 0, EF to 48 */ i = (((long)pkt_info_p -> stream_id) & 0xFF) - 192; if( i < 0 ) { /* Invalid stream: do nothing */ } else { /* Audio or Video stream. */ if( i < 48 ) { BOOL isaudio = (i < 32); struct PacketBlock *pb; if( demux_id[ i ] == -1 ) { /* A new stream */ if( isaudio ) { /* Audio */ demux_id[ i ] = current_audio; current_audio++; } else { demux_id[ i ] = current_video; current_video++; } } j = demux_id[ i ]; /* No file ? - Then create it ! */ if( (msid -> Demux . fd_demuxa[ j ] . sl_handle) == NULL ) { NewList( (struct List *)(&(msid -> Demux . fd_demuxa[ j ] . sl_packetblocklist)) ); msid -> Demux . fd_demuxa[ j ] . sl_handle = msid -> Demux . fdin; } /* block pos */ verbose_printf( cb, msid, "write: off %ld len %ld\n", (msid -> Demux . curr_file_pos + /* file pos */ (long)((pkt_info_p -> packet_ptr) - msid -> Demux . curr_file_pos_in_buffer)), (pkt_info_p -> packetlength) ); /* Create, fill and queue a PacketBlock node */ pb = (struct PacketBlock *)AllocPooled( (msid -> msid_Pool), (ULONG)sizeof( struct PacketBlock ) ); if( pb == NULL ) exitdemux( cb, msid, RETURN_FAIL, ERROR_NO_FREE_STORE ); pb -> system_offset = (msid -> Demux . curr_file_pos + (long)((pkt_info_p -> packet_ptr) - msid -> Demux . curr_file_pos_in_buffer)); /* file pos */ pb -> length = (pkt_info_p -> packetlength); /* Inc stream size */ msid -> Demux . fd_demuxa[ j ] . sl_size += pb -> length; AddTail( (struct List *)(&(msid -> Demux . fd_demuxa[ j ] . sl_packetblocklist)), (struct Node *)(&(pb -> node)) ); } else { if( i >= 48 ) { /* It's a reserved data stream. * Additional functionality will be implementation dependent */ verbose_printf( cb, msid, "Reserved data stream %ld is being ignored.\n", i ); break; } else { /* Should never be reached. */ error_printf( cb, msid, "Unrecognized stream ID: %ld %lx %lc\n", (pkt_info_p -> stream_id), (pkt_info_p -> stream_id), (long)(pkt_info_p -> stream_id) ); exitdemux( cb, msid, RETURN_FAIL, DTERROR_UNKNOWN_COMPRESSION ); } } } } break; } } } } } /* Success ? */ if( ((msid -> Demux . retval) <= RETURN_WARN) || (msid -> msid_IgnoreErrors) ) { RunHandler( cb, msid ); } FreeVec( (msid -> Demux . raw_data_buf) ); } } static void exitdemux( struct ClassBase *cb, struct MPEGSystemInstData *msid, LONG result, LONG result2 ) { msid -> Demux . retval = result; msid -> Demux . retval2 = result2; longjmp( (msid -> Demux . exit_buf), 1 ); } /*****************************************************************************/ static BPTR GetStreamLock( struct ClassBase *cb, struct MPEGSystemInstData *msid, ULONG num, BOOL isaudio ) { if( msid -> Handler . Process ) { BPTR lock; num += (isaudio)?(0UL):(msid -> Demux . N); /* Add video ID-offset if neccesary */ lock = (BPTR)DoPkt( (&(msid -> Handler . Process -> pr_MsgPort)), ACTION_COPY_DIR, MKBADDR( (num * 16) ), 0L, 0L, 0L, 0L ); return( lock ); } return( NULL ); } static void RunHandler( struct ClassBase *cb, struct MPEGSystemInstData *msid ) { if( msid -> Handler . Process = CreateNewProcTags( NP_Entry, (ULONG)Handler, NP_Name, (ULONG)"mpegsystem.datatype (MPEG System Demux Handler)", NP_Priority, 15L, NP_StackSize, 16384UL, TAG_DONE ) ) { /* Initialize the message */ msid -> Handler . Startup . sm_Message . mn_Node . ln_Type = NT_MESSAGE; msid -> Handler . Startup . sm_Message . mn_Length = sizeof( struct StartupMsg ); msid -> Handler . Startup . sm_CB = cb; msid -> Handler . Startup . sm_msid = msid; /* Send the information to the process */ PutMsg( (&(msid -> Handler . Process -> pr_MsgPort)), (&(msid -> Handler . Startup . sm_Message)) ); } } /* Kill our virtual demux filesystem and wait until it is really dead... * (Should be replaced by a version which uses exec.library/Wait) */ static void KillHandler( struct ClassBase *cb, struct MPEGSystemInstData *msid ) { while( (msid -> Handler . Process) ) { Forbid(); if( msid -> Handler . Process ) { Signal( (&(msid -> Handler . Process -> pr_Task)), SIGBREAKF_CTRL_C ); } Permit(); /* Wait a 1/25 sec before trying it again... */ Delay( (TICKS_PER_SECOND / 25UL) ); } } /* virtual demux filesystem handler entry */ DISPATCHERFLAGS static void Handler( void ) { #ifdef SysBase #undef SysBase #endif struct ExecBase *SysBase = (*((struct ExecBase **)4UL)); struct Process *pr; struct StartupMsg *sm; struct ClassBase *cb; struct MPEGSystemInstData *msid; ULONG sigflags; struct Message *msg; BOOL done = FALSE; /* Find out who we are */ pr = (struct Process *)FindTask( NULL ); /* Get the startup message */ WaitPort( (&(pr -> pr_MsgPort)) ); sm = (struct StartupMsg *)GetMsg( (&(pr -> pr_MsgPort)) ); /* Pull all the information required from the startup message */ cb = sm -> sm_CB; msid = sm -> sm_msid; /* BUG: The parent process does currently not handle a failure if this process... */ while( (msid -> Handler . mp = CreateMsgPort()) == NULL ) { } /* Init DOS_STDPKT queue which is used within the handler to avoid a AllocDOSObject * and fill it up with some packets... */ { ULONG i; NewList( (struct List *)(&(msid -> Handler . pktpool)) ); for( i = 0UL ; i < 16UL ; i++ ) { struct DosPacket *dp; if( dp = (struct DosPacket *)AllocDosObject( DOS_STDPKT, NULL ) ) { AddTail( (struct List *)(&(msid -> Handler . pktpool)), (&(dp -> dp_Link -> mn_Node)) ); } else { break; } } } do { sigflags = Wait( (1UL << (pr -> pr_MsgPort . mp_SigBit)) | SIGBREAKF_CTRL_C ); if( sigflags & SIGBREAKF_CTRL_C ) { done = TRUE; } while( msg = GetMsg( (&(pr -> pr_MsgPort)) ) ) { dispatch_packet( cb, msid, (struct DosPacket *)(msg -> mn_Node . ln_Name) ); } } while( (!done) || (msid -> Handler . OpenCount) ); /* Free DOS_STDPKT queue */ { struct Node *node; while( node = RemHead( (struct List *)(&(msid -> Handler . pktpool)) ) ) { struct DosPacket *dp = (struct DosPacket *)(node -> ln_Name); FreeDosObject( DOS_STDPKT, (APTR)dp ); } } DeleteMsgPort( (msid -> Handler . mp) ); Forbid(); msid -> Handler . Process = NULL; #define SysBase (cb -> cb_SysBase) } static void dispatch_packet( struct ClassBase *cb, struct MPEGSystemInstData *msid, struct DosPacket *dp ) { struct MsgPort *rport; struct StreamHandle *sh; switch( dp -> dp_Type ) { case ACTION_FINDINPUT: case ACTION_FH_FROM_LOCK: { struct FileHandle *fh = (struct FileHandle *)BADDR( (dp -> dp_Arg1) ); struct FileLock *fl = (struct FileLock *)BADDR( (dp -> dp_Arg2) ); LONG stream_index = fl -> fl_Key; if( sh = (struct StreamHandle *)AllocVec( sizeof( struct StreamHandle ), MEMF_PUBLIC ) ) { /* init StreamHandle */ sh -> sl = (&(msid -> Demux . fd_demuxa[ stream_index ])); sh -> currpos = 0L; /* Init FileHandle */ fh -> fh_Port = (struct MsgPort *)DOSFALSE; /* non-interactive handler */ fh -> fh_Arg1 = (LONG)sh; /* set to struct StreamHandle */ fh -> fh_Type = (&(msid -> Handler . Process -> pr_MsgPort)); /* Handler in-use */ msid -> Handler . OpenCount++; if( (dp -> dp_Type) == ACTION_FH_FROM_LOCK ) { /* Here we can "eat" the given filelock... */ FreeLock( cb, msid, fl ); } dp -> dp_Res1 = DOSTRUE; /* success */ dp -> dp_Res2 = 0L; /* No error */ } else { dp -> dp_Res1 = DOSFALSE; /* failure */ dp -> dp_Res2 = IoErr(); /* Cause ? */ } } break; case ACTION_END: { sh = (struct StreamHandle *)(dp -> dp_Arg1); if( sh ) { FreeVec( sh ); } msid -> Handler . OpenCount--; dp -> dp_Res1 = DOSTRUE; dp -> dp_Res2 = 0L; } break; case ACTION_READ: { LONG stream_offset = 0L; LONG read_size = (dp -> dp_Arg3); UBYTE *dest = (UBYTE *)(dp -> dp_Arg2); LONG error = 0L; LONG curr_read_size = 0L; /* bytes already in buffer */ LONG numpkt = 0L; /* pending packets */ struct FileHandle *fh; struct PacketBlock *worknode, *nextnode; sh = (struct StreamHandle *)(dp -> dp_Arg1); /* We use "fdin" instead of "sl_handle" here because our whole bunch of virtual streams are mapped to * one real system stream. "sl_handle" would only be used if we have one real stream handle for each * of our virtual handles. The same refers to the actual file position of the real stream handle * (see "classdata.h", "sl_handle_pos". */ #ifdef COMMENTED_OUT fh = BADDR( (sh -> sl -> sl_handle) ); #else fh = BADDR( (msid -> Demux . fdin) ); #endif /* COMMENTED_OUT */ worknode = (struct PacketBlock *)(sh -> sl -> sl_packetblocklist . mlh_Head); while( (nextnode = (struct PacketBlock *)(worknode -> node . mln_Succ)) && (read_size > 0UL) ) { /* Find start block */ if( (stream_offset <= (sh -> currpos)) && ((stream_offset + (worknode -> length)) > (sh -> currpos)) ) { LONG cut = ((sh -> currpos) - stream_offset), curr_readlen = MIN( read_size, ((worknode -> length) - cut) ); LONG abs_seek_pos; /* seek position, relative from the beginning of the file */ #if 0 if( Seek( (sh -> sl -> sl_handle), ((worknode -> system_offset) + cut), OFFSET_BEGINNING ) == -1L ) { break; } #else abs_seek_pos = ((worknode -> system_offset) + cut); if( SendSeek( cb, msid, fh, (abs_seek_pos - (LONG)(msid -> Demux . fdin_pos)), OFFSET_CURRENT ) ) { numpkt++; msid -> Demux . fdin_pos = abs_seek_pos; } else { error = IoErr(); break; } #endif /* We only need to check for a "complete fill" or failure, because the previous scan * (in the demuxer part) gurantees that the buffer (packet) has at least this ("curr_readlen") size */ #if 0 if( Read( (sh -> sl -> sl_handle), dest, curr_readlen ) != curr_readlen ) { error = IoErr(); break; } #else if( SendRead( cb, msid, fh, dest, curr_readlen ) ) { numpkt++; msid -> Demux . fdin_pos += curr_readlen; } else { error = IoErr(); break; } #endif dest += curr_readlen; read_size -= curr_readlen; curr_read_size += curr_readlen; sh -> currpos += curr_readlen; /* Should never ever happen, but... */ if( read_size < 0L ) { error = ERROR_BUFFER_OVERFLOW; break; } } stream_offset += worknode -> length; worknode = nextnode; } #if 1 /* Wait for outstanding msgs and fetch success/errorc codes from them */ while( numpkt > 0L ) { struct Message *msg; WaitPort( (msid -> Handler . mp) ); while( msg = GetMsg( (msid -> Handler . mp) ) ) { struct DosPacket *rdp = (struct DosPacket *)(msg -> mn_Node . ln_Name); /* This assumes that we only get ACTION_SEEK/ACTION_READ here back... */ if( (rdp -> dp_Res1) == -1L ) { error = rdp -> dp_Res2; } ReleaseDOSPacket( cb, msid, rdp ); numpkt--; } } #endif /* Resync on error. Required because we don't know whether the ACTION_READ (see above) * was executed or not. */ if( error ) { msid -> Demux . fdin_pos = Seek( (msid -> Demux . fdin), 0L, OFFSET_CURRENT ); } dp -> dp_Res1 = ((error)?(-1L):(curr_read_size)); /* bytes read */ dp -> dp_Res2 = error; /* result2 */ } break; case ACTION_SEEK: { LONG newpos = 0L; sh = (struct StreamHandle *)(dp -> dp_Arg1); switch( dp -> dp_Arg3 ) { case OFFSET_BEGINNING: { newpos = dp -> dp_Arg2; } break; case OFFSET_CURRENT: { newpos += (sh -> currpos) + (dp -> dp_Arg2); } break; case OFFSET_END: { newpos += (sh -> sl -> sl_size) + (dp -> dp_Arg2); } break; default: /* should return ERROR_SEEK_ERROR */ { newpos = -1L; /* forces ERROR_SEEK_ERROR by bounds check below */ } break; } /* Check bounds */ if( (newpos > (sh -> sl -> sl_size)) || (newpos < 0L) ) { dp -> dp_Res1 = -1L; dp -> dp_Res2 = ERROR_SEEK_ERROR; } else { dp -> dp_Res1 = sh -> currpos; /* Return abolsute position BEFORE the seek took place */ dp -> dp_Res2 = 0L; sh -> currpos = newpos; } } break; case ACTION_COPY_DIR_FH: { struct FileLock *dest; struct StreamList *sl = ((struct StreamHandle *)(dp -> dp_Arg1)) -> sl; if( dest = (struct FileLock *)AllocVec( sizeof( struct FileLock ), MEMF_PUBLIC ) ) { LONG stream_index = (sl - (&(msid -> Demux . fd_demuxa[ 0 ]))); /* Return array index of "sl" */ dest -> fl_Link = NULL; dest -> fl_Key = stream_index; dest -> fl_Access = ACCESS_READ; dest -> fl_Task = (&(msid -> Handler . Process -> pr_MsgPort)); dest -> fl_Volume = NULL; msid -> Handler . OpenCount++; } dp -> dp_Res1 = MKBADDR( dest ); dp -> dp_Res2 = (dp -> dp_Res1)?(0L):(IoErr()); } break; case ACTION_COPY_DIR: { struct FileLock *src = (struct FileLock *)BADDR( (dp -> dp_Arg1) ), *dest; if( dest = (struct FileLock *)AllocVec( sizeof( struct FileLock ), MEMF_PUBLIC ) ) { if( (LONG)src > 256L ) { *dest = *src; msid -> Handler . OpenCount++; } else { LONG key = ((LONG)src / 16); /* src is now the index... */ /* Does we have a system stream to work on ? */ if( msid -> Demux . fd_demuxa[ key ] . sl_handle ) { dest -> fl_Link = NULL; dest -> fl_Key = key; dest -> fl_Access = ACCESS_READ; dest -> fl_Task = (&(msid -> Handler . Process -> pr_MsgPort)); dest -> fl_Volume = NULL; msid -> Handler . OpenCount++; } else { FreeVec( dest ); dest = NULL; SetIoErr( ERROR_OBJECT_NOT_FOUND ); } } } dp -> dp_Res1 = MKBADDR( dest ); dp -> dp_Res2 = (dp -> dp_Res1)?(0L):(IoErr()); } break; case ACTION_FREE_LOCK: { struct FileLock *fl = (struct FileLock *)BADDR( (dp -> dp_Arg1) ); FreeLock( cb, msid, fl ); dp -> dp_Res1 = DOSTRUE; dp -> dp_Res2 = 0L; } break; case ACTION_IS_FILESYSTEM: { dp -> dp_Res1 = DOSTRUE; /* We are a filesystem */ dp -> dp_Res2 = 0L; /* Avoid Lock( ":", SHARED_LOCK ); overhead, * see Ralf Babel's "The Amiga GURU Book", * section 21.2.3.17, page 621 */ } break; case ACTION_EXAMINE_OBJECT: { struct FileLock *fl = (struct FileLock *)BADDR( (dp -> dp_Arg1) ); struct FileInfoBlock *fib = (struct FileInfoBlock *)BADDR( (dp -> dp_Arg2) ); LONG stream_index = fl -> fl_Key; struct StreamList *sl = (&(msid -> Demux . fd_demuxa[ stream_index ])); dp -> dp_Res1 = ExamineFH( (sl -> sl_handle), fib ); if( dp -> dp_Res1 ) { TEXT buffer[ 256 ]; mysprintf( cb, buffer, "%s@%ld", (fib -> fib_FileName), stream_index ); stccpy( (fib -> fib_FileName), buffer, sizeof( (fib -> fib_FileName) ) ); /* Set our stream size */ fib -> fib_Size = sl -> sl_size; /* Bump number of blocks */ fib -> fib_NumBlocks = INTDIVR( (sl -> sl_size), 1024UL ); /* BUG: Should be packet size to allow faster reading * in conjunction with async I/O */ /* Convert to BCPL strings */ STRPTR2BSTR( (fib -> fib_FileName) ); STRPTR2BSTR( (fib -> fib_Comment) ); dp -> dp_Res2 = 0L; } else { dp -> dp_Res2 = IoErr(); } } break; case ACTION_PARENT: { struct FileLock *fl = (struct FileLock *)BADDR( (dp -> dp_Arg1) ); LONG stream_index = fl -> fl_Key; struct StreamList *sl = (&(msid -> Demux . fd_demuxa[ stream_index ])); dp -> dp_Res1 = ParentOfFH( (sl -> sl_handle) ); /* Get parent of system stream */ dp -> dp_Res2 = IoErr(); } break; case ACTION_INFO: /* Required for async I/O */ default: { dp -> dp_Res1 = DOSFALSE; dp -> dp_Res2 = ERROR_ACTION_NOT_KNOWN; } break; } rport = dp -> dp_Port; dp -> dp_Port = (&(msid -> Handler . Process -> pr_MsgPort)); PutMsg( rport, (dp -> dp_Link) ); } /* Convert a C string into a BCPL string */ static void STRPTR2BSTR( STRPTR s ) { size_t len = strlen( s ); memmove( (&s[ 1 ]), s, len ); s[ 0 ] = len; /* WARNING: Assumes that the string is less than < 255 bytes ! */ } static void FreeLock( struct ClassBase *cb, struct MPEGSystemInstData *msid, struct FileLock *fl ) { if( fl ) { fl -> fl_Task = NULL; /* Any attempt to use the FileLock again should be DEADLY !! */ msid -> Handler . OpenCount--; FreeVec( fl ); } } /* Fetch a DosPacket from our private pool */ static struct DosPacket *ObtainDOSPacket( struct ClassBase *cb, struct MPEGSystemInstData *msid ) { struct DosPacket *dp; struct Node *node; if( node = RemHead( (struct List *)(&(msid -> Handler . pktpool)) ) ) { dp = (struct DosPacket *)(node -> ln_Name); } else { dp = (struct DosPacket *)AllocDosObject( DOS_STDPKT, NULL ); } return( dp ); } /* Return a DosPacket to our private pool */ static void ReleaseDOSPacket( struct ClassBase *cb, struct MPEGSystemInstData *msid, struct DosPacket *dp ) { AddTail( (struct List *)(&(msid -> Handler . pktpool)), (&(dp -> dp_Link -> mn_Node)) ); } /* Send a seek async */ static BOOL SendSeek( struct ClassBase *cb, struct MPEGSystemInstData *msid, struct FileHandle *fh, LONG pos, LONG mode ) { struct DosPacket *dp; if( dp = ObtainDOSPacket( cb, msid ) ) { dp -> dp_Type = ACTION_SEEK; dp -> dp_Arg1 = fh -> fh_Arg1; dp -> dp_Arg2 = pos; dp -> dp_Arg3 = mode; dp -> dp_Port = dp -> dp_Link -> mn_ReplyPort = msid -> Handler . mp; PutMsg( (fh -> fh_Type), (dp -> dp_Link) ); return( TRUE ); } return( FALSE ); } /* Send a read async */ static BOOL SendRead( struct ClassBase *cb, struct MPEGSystemInstData *msid, struct FileHandle *fh, UBYTE *buffer, ULONG len ) { struct DosPacket *dp; if( dp = ObtainDOSPacket( cb, msid ) ) { dp -> dp_Type = ACTION_READ; dp -> dp_Arg1 = fh -> fh_Arg1; dp -> dp_Arg2 = (LONG)buffer; dp -> dp_Arg3 = len; dp -> dp_Port = dp -> dp_Link -> mn_ReplyPort = msid -> Handler . mp; PutMsg( (fh -> fh_Type), (dp -> dp_Link) ); return( TRUE ); } return( FALSE ); }