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Cinepak for SEGASaturn

4.6 Function details 

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 table
 Title
 function specification
 Data
 Initialization
 Data Name
 CPK_Init
 No
 1.1

Format
Bool CPK_Init(void)
input
none
output
none
function value
TRUE if initialization was successful
FALSE if unable to initialize successfully
function
Immediately after starting the program, initialization is performed to use this library.
remarks
When using this library, be sure to call this function at the beginning of the program. 

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 table
 Title
 function specification
 Data
 End processing
 Data Name
 CPK_Finish
 No
 1.2
Format
void CPK_Finish(void)
input
none
output
none
function value
none
function
If you do not want to play the movie again, call this function. 

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 table
 Title
 function specification
 Data
 Creating a handle (memory)
 Data Name
 CPK_CreateMemMovie
 No
 2.1
Format
CpkHn CPK_CreateMemMovie(CpkCreatePara *para)
input
para: creation parameter
output
none
function value
Movie handle (NULL if cannot be created)
function
Creates a movie handle to play a movie file in memory.
remarks 

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 Title
 function specification
 Data
 Erasing handles (memory)
 Data Name
 CPK_DestroyMemMovi
 No
 2.2
Format
void CPK_DestroyMemMovie(CpkHn cpk)
input
cpk: movie handle
output
none
function value
none
function
Erase the movie handle.
Once you clear a handle, you can no longer use the movie handle. 

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 table
 Title
 function specification
 Data
 Creating a handle (file system)
 Data Name
 CPK_CreateGfsMovie
 No
 2.3
Format
CpkHn CPK_CreateGfsMovie(CpkCreatePara *para, GfsHn gfs)
input
para: creation parameter
gfs: file handle
output
none
function value
Movie handle (NULL if cannot be created)
function
Creates a movie handle to play a movie file on the file system.
remarks 

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 table
 Title
 function specification
 Data
 Clearing a handle (file system)
 Data Name
 CPK_DestroyGfsMovi
 No
 2.4
Format
void CPK_DestroyGfsMovie(CpkHn cpk)
input
cpk: movie handle
output
none
function value
none
function 

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 table
 Title
 function specification
 Data
 Creating a handle (stream system)
 Data Name
 CPK_CreateStmMovie
 No
 2.5
Format
CpkHn CPK_CreateStmMovie(CpkCreatePara *para, StmHn stm)
input
para: creation parameter
stm: file handle
output
none
function value
Movie handle (NULL if cannot be created)
function
Create a movie handle to play the movie file on the stream system.
remarks 

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 table
 Title
 function specification
 Data
 Clearing handles (stream system)
 Data Name
 CPK_DestroyStmMovi
 No
 2.6
Format
void CPK_DestroyStmMovie(CpkHn cpk)
input
cpk: movie handle
output
none
function value
none
function 

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 table
 Title
 function specification
 Data
 replay task
 Data Name
 CPK_Task
 No
 2.7
Format
void CPK_Task(CpkHn cpk)
input
cpk: movie handle
output
none
function value
none
function
Loads files from CD and expands images.
If you specify NULL for cpk, the play task will be executed for all the handles that are being played.
remarks
Please call this function periodically while the movie is playing.
Please set the calling interval to be greater than the number of playback frames. If the number of frames is less than that, smooth playback will not be possible.
After reading this function, be sure to check whether the display timing is set using CPK_IsDispTime. If CPK_IsDispTime returns TRUE, the timer to display the image　　Since it is processing, please change the frame if it has been expanded to sprite VRAM. If it was expanded to memory, please transfer it to VRAM. Be sure to call CPK_CompleteDisp afterwards.
Please note that if you specify the destination address in VRAM, the data will be expanded before the display timing. 

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 table
 Title
 function specification
 Data
 Determining display timing
 Data Name
 CPK_IsDispTime
 No
 2.8
Format
Bool CPK_IsDispTime(CpkHn cpk)
input
cpk: movie handle
output
none
function value
TRUE when the movie frame image has been expanded and it is time to display it.
FALSE if it is not yet time to display
function
If this function returns TRUE, it is time to display one frame of image, so if it was expanded to sprite VRAM, change the frame. If it was expanded to memory, transfer the expanded contents to VRAM. Be sure to call CPK_CompleteDisp afterward. 

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 Title
 function specification
 Data
 Display completion notification
 Data Name
 CPK_CompleteDisp
 No
 2.9
Format
void CPK_CompleteDisp(CpkHn cpk)
input
cpk: movie handle
output
none
function value
none
function
Notifies the library that the image display has finished.
remarks
Please call this function when CPK_IsDispFrame becomes TRUE. If you do not call it, the movie will not play. 

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 table
 Title
 function specification
 Data
 V blank IN processing function
 Data Name
 CPK_VblIn
 No
 2.10
Format
void CPK_VblIn(void)
input
none
output
none
function value
none
function
Manage the movie playback time.
remarks
When using this library, be sure to call this function with a V blank IN interrupt. 

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 table
 Title
 function specification
 Data
 Start playing
 Data Name
 CPK_Start
 No
 3.1
Format
void CPK_Start(CpkHn cpk)
input
cpk: movie handle
output
none
function value
none
function
Start playing the movie.
remarks
A movie can only be played once for a generated movie handle.
If you want to play the same movie over and over again, generate a movie handle each time. 

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 table
 Title
 function specification
 Data
 Stop playing
 Data Name
 CPK_Stop
 No
 3.2
Format
void CPK_Stop(CpkHn cpk)
input
cpk: movie handle
output
none
function value
none
function
Stop playing the movie. 

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 table
 Title
 function specification
 Data
 Pause
 Data Name
 CPK_Pause
 No
 3.3
Format
void CPK_Pause(CpkHn cpk, CpkPauseCmd cmd)
input
cpk: movie handle
cmd: Pause control command
output
Returns a Boolean type return value.
TRUE :Command was accepted
FALSE :Command was not accepted

Returns FALSE if:

function value
none
function
Pause or cancel movie playback. 

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 table
 Title
 function specification
 Data
 Registering the next movie to play
 Data Name
 CPK_EntryNext
 No
 3.4
Format
void CPK_EntryNext(CpkHn cpk)
input
cpk: movie handle
output
none
function value
none
function
Next, register the movie handle to be played. If you register a movie with this function, it will automatically switch to the next movie when the currently playing movie ends.
Specifying NULL will cancel the registration.
Even when forced switching is performed using CPK_Change, the movie registered using this function will be played next. 

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 table
 Title
 function specification
 Data
 Forced movie switching
 Data Name
 CPK_Change
 No
 3.5
Format
void CPK_Change(void)
input
none
output
none
function value
none
function
Interrupts the currently playing movie and starts playing the movie registered in CPK_EntryNext. 

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 table
 Title
 function specification
 Data
 Obtaining movie switching status
 Data Name
 CPK_CheckChange
 No
 3.6
Format
CpkChangeStatus CPK_CheckChange(void)
input
none
output
none
function value
Forced switch possibility check value
function
Returns the possibility of switching when forced switching with CPK_Change. 

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 Title
 function specification
 Data
 Expand specified frame
 Data Name
 CPK_DecodeFrame
 No
 3.7
Format
void CPK_DecodeFrame(CpkHn cpk, Sint32 frame_no)
input
cpk: movie handle
frame_no: Number of frame to expand
output
none
function value
none
function
Expands the image in the specified frame.
remarks
This function can only be used for movies loaded into memory.
In the application program, read the movie file, create a movie handle with CPK_CreateMemMovie, and then call this function.
This function cannot be used with movie handles created with CPK_CreateGfsMovie and CPK_CreateStmMovie.
Please use a movie file with only keyframes and no sound. 

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 table
 Title
 function specification
 Data
 Expand specified frame
 (Differential frame guarantee)
 Data Name
 CPK_DecodeFrameSafety
 No
 3.8
Format
void CPK_DecodeFrameSafety(CpkHn cpk, Sint32 sample_no)
input
cpk: handle
sample_no: Sample number
output
none
function value
none
function
Expands the image in the specified frame.
remarks
CPK_DecodeFrameSafety processes back to the keyframe in the case of a differential frame and outputs the correct image. Use this when randomly accessing a movie containing differential frames.
Note
Please load it in advance and use it for memory playback.
If it does not contain audio, the frame number is the sample number. If audio is included, make sure that the sample number you specify is not an audio sample. Please refer to smpcpk7.c as there is a process to obtain the sample number from the frame number. 

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 table
 Title
 function specification
 Data
 Setting the destination address
 Data Name
 CPK_SetDecodeAddr
 No
 4.1
Format
void CPK_SetDecodeAddr(CpkHn cpk, void *dec_addr, Sint32 dec_line_size)
input
cpk: movie handle
dec_addr: Address of image expansion destination
dec_line_size: Number of bytes in one line of image expansion destination buffer
output
none
function value
none
function
Specify the address to transfer the expanded image.
If the image expansion destination address is NULL, image expansion will not be performed. Default is NULL.
Please call this function before playing the movie. 

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 table
 Title
 function specification
 Data
 Setting the number of display colors
 Data Name
 CPK_SetColor
 No
 4.2
Format
void CPK_SetColor(CpkHn cpk, CpkColorType color)
input
cpk: movie handle
color: Number of display colors
output
none
function value
none
function
Specify the number of colors displayed in the image. Default is 16 million colors.
Please call this function before playing the movie. 

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 function specification
 Data


 Setting the maximum number of transferred sectors
 Data Name


 CPK_SetLoadNum
 No


 4.3
Format
void CPK_SetLoadNum(CpkHn cpk, Sint32 load_sct)
input
cpk: movie handle
load_sct: Maximum number of transferred sectors
output
none
function value
none
function
Set the maximum number of transfer sectors when transferring from the CD buffer to the library's internal buffer. Default is 20 sectors.
Please call this function before playing the movie. 

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 Title


 function specification
 Data


 Playback PAN settings
 Data Name


 CPK_SetPan
 No


 4.4
Format
void CPK_SetPan(CpkHn cpk, Sint32 pan)
input
cpk: movie handle
pan: PAN value (0 to 31)
output
none
function value
none
function
Specify the PAN of the sound. Default is 0.
 0
 1
 2
 →
 15
 16
 17
 18
 →
 31
 Left

 Right
 Max

 Max
>>

 Max
>>

 Max
>>

 Max
 Off

 Max
 Max

 Max
 Max

>>
 Max

>>
 Max

>>
 Max

 Off 
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 Title


 function specification
 Data


 Setting playback volume
 Data Name


 CPK_SetVolume
 No


 4.5
 Format
 void CPK_SetVolume(CpkHn cpk, Sint32 volume)
 input
 cpk: movie handle
 volume: Volume (0 to 7)
 output
 none
 function value
 none
 function
 Specify the volume. (0 = no output, 7 = maximum volume) Default is 7. 
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 Title


 function specification
 Data


 Setting PCM command block number
 Data Name


 CPK_SetPcmCmdBlock
 No


 4.6
 Format
 voidC PK_SetPcmCmdBlockNo(CpkHn cpk, Sint32 blk_no)
 input
 cpk: movie handle
 blk_no: PCM command block number (0 to 7)
 output
 none
 function value
 none
 function
 Set the PCM command block number to be set in the sound driver. Default is 0.
 For more information on PCM command block numbers, see SEGASATURN Sound Driver System Interface.
 Please call this function before playing the movie. 
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 Title


 function specification
 Data


 Setting the PCM stream playback number
 Data Name


 CPK_SetPcmStreamNo
 No


 4.7
 Format
 void CPK_SetPcmStreamNo(CpkHn cpk, Sint32 stream_no)
 input
 cpk: movie handle
 stream_no: PCM stream playback number (0 to 7)
 output
 none
 function value
 none
 function
 Set the PCM stream playback number to be set in the sound driver. Default is 0.
 For more information on PCM stream playback numbers, see SEGASATURN Sound Driver System Interface.
 remarks
 When playing multi-movies, use different stream playback numbers for each movie. Please call this function before playing the movie. 
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 function specification
 Data


 Setting the key out range
 Data Name


 CPK_SetKeyOutRange
 No


 4.8
 Format
 void CPK_SetKeyOutRange(CpkHn cpk, Sint32 range)
 input
 cpk: movie handle
 range: Key out (transparent color) range
 output
 none
 function value
 none
 function
 Set the range of transparent colors in chroma key processing.
 remarks
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 Title


 function specification
 Data


 Silence rate setting
 Data Name


 CPK_SetSilenceRate
 No


 4.9
 Format
 void CPK_SetSilenceRate(CpkHn cpk, Sint32 silence_rate)
 input
 cpk:handle
 silence_rate: Silence rate [1/sec] 1 to 15
 Default is CPK_DEFAULT_SILENCE_RATE
 output
 none
 function value
 none
 remarks
 A silence rate of 4 means a quarter of a second of silence. Maximum 1 second.
 If the load other than the Cinepak library is heavy at the end of playback and noise occurs due to insufficient silence, you can adjust the silence setting amount and avoid the noise. 
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 function specification
 Data


 Setting the playback start trigger size
 Data Name


 CPK_SetStartTrgSize
 No


 4.10
 Format
 void CPK_SetStartTrgSize(CpkHn cpk, Sint32 size)
 input
 cpk:handle
 size: Supply amount to ring buffer [byte]
 A data supply larger than this size is a prerequisite for starting playback.
 Must be less than (ring buffer size - 24 sectors).
 Must be less than the playback file size.
 Default is CPKLIB_SIZE_TRIGGER (0 byte).
 output
 none
 function value
 none
 remarks
 Please set before starting playback. Even with this setting, CPK_Start or CPK_EntryNext is still required.
 The average is about 300[kbyte/s], and even if there are sections that exceed 300[kbyte/s] to some extent, it will be possible to tolerate fluctuations in the data rate equivalent to this setting amount.
 This setting improves stability and reduces the chance of dropped frames.
 However, you must consider the delay in the start of playback depending on this setting amount. 
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 function specification
 Data


 Setting CPU usage conditions
 Data Name


 CPK_SetCpu
 No


 4.11
 Format
 void CPK_SetCpu(CpkCpu cpu)
 input
 cpu :CPU usage conditions
 argument meaning
 CPK_CPU_MAIN
 Only SH2 on the master side is used. (Default)
 CPK_CPU_DUAL
 Use both master and slave SH2.
 output
 none
 function value
 none
 remarks
 Supports dual CPU decompression processing. The processing speed will not be much faster because it involves a lot of reading and writing of data, but the processing speed will be improved by about 15% to 20%.
 (Even for 32000 colors, measurements were made by first outputting to WORK RAM H.)
 You can play 320×200[dot] 20[fps] videos in full color. If the area is small and the frame is not divided (the number of tiles is 1), dual CPU processing will not be possible.
 Note
 When using a slave CPU with Cinepac, applications cannot use the slave CPU. 
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 function specification
 Data


 Stream server function call settings
 Data Name


 CPK_SetStmServerCall
 No


 4.12
 Format
 void CPK_SetStmServerCall(Bool mode)
 input
 mode: call settings
 argument meaning
 ON
 Library side calls. (Default)
 OFF
 Application side calls.
 output
 none
 function value
 none
 remarks
 This function has meaning when performing stream playback. This setting allows the application to call server functions.
 The following two processes are equivalent.
 [Processing A]
 after initialization
 :CPK_SetStmServerCall(ON);
 Periodically during playback
 : CPK_Task (cpkhn);
 −−−−−−−−−−−−−−−−−−−−−−−−−−−−
 [Processing B]
 after initialization
 :CPK_SetStmServerCall(OFF);
 Periodically during playback
 : STM_ExecServer ();

 CPK_Task (cpkhn);
 It is effective to avoid excessive calls to STM_ExecServer when calling CPK_Task multiple times at the same time during multi-playback or branch playback, or when reading data other than Cinepak from a CD in parallel.
 When the application side calls, STM_ExecTrans can be called instead of STM_ExecServer in some cases.
 Due to the module structure, it is not desirable to call STM_ExecServer within CPK_Task , so it is recommended that the application side call it. 
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 Setting playback speed
 Data Name


 CPK_SetSpeed
 No


 4.13
 Format
 void CPK_SetSpeed(CpkHn cpk, Sint32 speed, Bool audio_sw)
 input
 cpk : Handle
 speed: playback speed
 argument
 meaning
 0
 : Play at normal playback speed. Same speed. (Default)
 1~1024
 : Constant speed ratio x 1024

 (1024: Normal speed, 512: 1/2 slow, 256: 1/4 slow)
 audio_sw :Audio output switch
 argument
 meaning
 ON
 : Audio output available. (Default)
 OFF
 : No audio output. (Volume 0)
 output
 none
 function value
 none
 remarks
 speed sets the playback speed with the value of constant speed ratio x 1024. 512 slows playback to 1/2, 256 slows playback to 1/4. 0 (zero) specifically means normal playback speed.
 The upper limit of playback speed is normal playback speed (1024).
 The minimum playback speed is determined by the audio frequency of the video as follows:
 audio frequency
 Lower limit of playback speed (speed)
 Constant speed ratio
 44100[Hz]
 4
 4/1024 = 1/256
 22050[Hz]
 8
 8/1024 = 1/128
 11025[Hz]
 16
 16/1024 = 1/64
 video only
 1
 1/1024
 audio_sw is a switch to turn off the volume while changing speed. Even if it is turned off, PCM stream playback is performed internally.
 The following constant macros are defined in relation to this function:
 CPK_SPEED_ORIGINAL, CPK_SPEED_UNIT 
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 function specification
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 Get timescale
 Data Name


 CPK_GetTimeScale
 No


 5.1
 Format
 Sint32 CPK_GetTimeScale(CpkHn cpk)
 input
 cpk: movie handle
 output
 none
 function value
 time scale
 function
 Get the timescale value.
 The time scale value is invalid until the film header data has been supplied to the ring buffer. 
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 function specification
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 Get playback time
 Data Name


 CPK_GetTime
 No


 5.2
 Format
 Sint32 CPK_GetTime(CpkHn cpk)
 input
 cpk: movie handle
 output
 none
 function value
 current time
 function
 Get the current time of the movie. The current time is a count value in timescale units. 
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 Get playback status
 Data Name


 CPK_GetPlayStatus
 No


 5.3
 Format
 CpkPlayStatus CPK_GetPlayStatus(CpkHn cpk)
 input
 cpk: movie handle
 output
 none
 function value
 playback status
 function
 Returns the movie's current playback status. 
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 Title
 function specification
 Data
 Get film header
 Data Name
 CPK_GetHeader
 No
 5.4
 Format
 CpkHeader *CPK_GetHeader(CpkHn cpk)
 input
 cpk: movie handle
 output
 none
 function value
 film header
 function
 Returns the address of the film header part of the movie file.
 The contents of the structure are invalid until the film header data has been supplied to the buffer. 
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 Title
 function specification
 Data
 Acquisition of data storage amount [byte]
 Data Name
 CPK_GetStockSize
 No
 5.5
 Format
 void CPK_GetStockSize(CpkHn cpk, Sint32 *ring_bsize, Sint32 *all_bsize)
 input
 cpk:handle
 output
 *ring_bsize: Reserved amount in ring buffer [byte]
 *all_bsize: Storage amount including the amount in CD block [byte]
 function value
 none
 function
 This can be used to determine whether seamlessness can be achieved safely.
 If no output is required, specify NULL for that argument.
 all_bsize is not output for memory reclamation handles. 
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 function specification
 Data
 Obtain data storage amount [timescale]
 Data Name
 CPK_GetStockTime
 No
 5.6
 Format
 void CPK_GetStockTime(CpkHn cpk, Sint32 *ring_time, Sint32 *all_time)
 input
 cpk:handle
 output
 *ring_bsize: Reserved amount in ring buffer [timescale]
 *all_bsize: Reserved amount including the amount in CD block [timescale]
 function value
 none
 function
 This can be used to determine whether seamlessness can be achieved safely.
 If no output is required, specify NULL for that argument.
 All_time is not output for memory reclamation handles.
 Note
 If the task function is called without starting after the handle is created, there may be some reserves in the ring buffer, but if the header has not been processed yet, it cannot be checked and 0 is returned. With CPK_GetStockSize , you can get a valid value even in this situation. 
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 function specification
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 Get write buffer
 Data Name
 CPK_GetWriteBuf
 No
 6.1
 Format
 Uint32 *CPK_GetWriteBuf(CpkHn cpk, Sint32 *free_size, Sint32 *free_total)
 input
 cpk: movie handle
 output
 free_size: Number of bytes of area that can be written continuously
 free_total: Total number of bytes of writable area including non-contiguous areas
 function value
 Start address of continuous writable area (NULL if writable is not possible)
 function
 Get the buffer address to write to and the number of bytes that can be written.
 remarks
 Use this when you want to independently supply data to the ring buffer. 
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 function specification
 Data
 Write size notification
 Data Name
 CPK_NotifyWriteBuf
 No
 6.2
 Format
 void CPK_NotifyWriteSize(CpkHn cpk, Sint32 write_size)
 input
 cpk: movie handle
 write_size: Number of bytes written
 output
 none
 function value
 none
 function
 Tells the library how many bytes were actually written to the buffer.
 remarks
 Use this when you want to independently supply data to the ring buffer.
 Used when playing movie files in memory. 
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 function specification
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 Load movie into buffer
 Data Name
 CPK_PreloadMovie
 No
 7.1
 Format
 void CPK_PreloadMovie(CpkHn cpk, Uint32 size)
 input
 cpk: movie handle
 size: number of bytes to read
 output
 none
 function value
 none
 function
 Load the movie file into memory.
 remarks
 If the number of bytes read is smaller than the buffer managed by the library, read up to the buffer size. 
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 function specification
 Data
 Load film header into buffer
 Data Name
 CPK_PreloadHeader
 No
 7.2
 Format
 void CPK_PreloadHeader(CpkHn cpk)
 input
 cpk: movie handle
 output
 none
 function value
 none
 function
 Loads the film header part of a movie file into memory.
 remarks
 Before calling this function, move the pickup position to the beginning of the movie file. 
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 function specification
 Data
 Get error information
 Data Name
 CPK_GetErr
 No
 8.1
 Format
 CpkErrCode CPK_GetErr(void)
 input
 none
 output
 none
 function value
 Error code
 function
 Returns the most recent error code. 
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 function specification
 Data
 Registering an error function
 Data Name
 CPK_SetErrFunc
 No
 8.2
 Format
 void CPK_SetErrFunc(CpkErrFunc func, void *obj)
 input
 func: Function to call when an error occurs
 obj :Registered object
 output
 none
 function value
 none
 function
 Set the function to be called when an error occurs. The registration object is passed as the first argument of the registration function. 
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 function specification
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 Securing SCU-DSP resources
 Data Name
 CPK_AllocScuDsp
 No
 9.1
 Format
 Sint32 CPK_AllocScuDsp(void)
 input
 output
 none
 function value
 argument
 meaning
 OK
 :SCU-DSP is reserved on the application side.
 (Including cases where the library is not using it)
 NG
 :The library is in use, so it cannot be secured now.
 remarks
 Use CPK_AllocScuDsp and CPK_FreeScuDsp when using SCU-DSP with both Cinepak library and application.
 If CPK_TRMODE_SCUDSPDMA is specified as the transfer method, the SCU-DSP usage rights are initially in the Cinepak library.
 Applications can temporarily use SCU-DSP only when the Cinepak library is not using SCU-DSP, that is, when the return value of CPK_AllocScuDsp is OK.
 If CPK_AllocScuDsp returns OK, the Cinepak library suspends processing using SCU-DSP until CPK_FreeScuDsp is called.
 Therefore, if you leave it in a secured state for a long time, playback may be delayed.
 When the usage rights are transferred, the contents of the DSP program are no longer guaranteed, so the application side must also load the DSP program each time.
 This function must not be called for interrupt processing while the task function is running. 
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 function specification
 Data
 Releasing SCU-DSP resources
 Data Name
 CPK_FreeScuDsp
 No
 9.2
 Format
 void CPK_FreeScuDsp(void)
 input
 none
 output
 none
 function value
 none
 remarks
 See CPK_AllocScuDsp . 
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★ MOVIE TOOLS GUIDE ★ Cinepak for SEGASaturn
 Copyright SEGA ENTERPRISES, LTD. 1997