fw-decoder-api.txt

Decoder firmware API description
================================

Note: this API is part of the decoder firmware, so it's cx23415 only.

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Name 	CX2341X_DEC_PING_FW
Enum 	0/0x00
Description
	This API call does nothing. It may be used to check if the firmware
	is responding.

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Name 	CX2341X_DEC_START_PLAYBACK
Enum 	1/0x01
Description
	Begin or resume playback.
Param[0]
	0 based frame number in GOP to begin playback from.
Param[1]
	Specifies the number of muted audio frames to play before normal
	audio resumes. (This is not implemented in the firmware, leave at 0)

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Name 	CX2341X_DEC_STOP_PLAYBACK
Enum 	2/0x02
Description
	Ends playback and clears all decoder buffers. If PTS is not zero,
	playback stops at specified PTS.
Param[0]
	Display 0=last frame, 1=black
	Note: this takes effect immediately, so if you want to wait for a PTS,
	then use '0', otherwise the screen goes to black at once.
	You can call this later (even if there is no playback) with a 1 value
	to set the screen to black.
Param[1]
	PTS low
Param[2]
	PTS high

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Name 	CX2341X_DEC_SET_PLAYBACK_SPEED
Enum 	3/0x03
Description
	Playback stream at speed other than normal. There are two modes of
	operation:
	    Smooth: host transfers entire stream and firmware drops unused
		    frames.
	    Coarse: host drops frames based on indexing as required to achieve
		    desired speed.
Param[0]
	Bitmap:
	    0:7  0 normal
		 1 fast only "1.5 times"
		 n nX fast, 1/nX slow
	    30   Framedrop:
		     '0' during 1.5 times play, every other B frame is dropped
		     '1' during 1.5 times play, stream is unchanged (bitrate
			 must not exceed 8mbps)
	    31   Speed:
		     '0' slow
		     '1' fast
	Note: n is limited to 2. Anything higher does not result in
	faster playback. Instead the host should start dropping frames.
Param[1]
	Direction: 0=forward, 1=reverse
	Note: to make reverse playback work you have to write full GOPs in
	reverse order.
Param[2]
	Picture mask:
	    1=I frames
	    3=I, P frames
	    7=I, P, B frames
Param[3]
	B frames per GOP (for reverse play only)
	Note: for reverse playback the Picture Mask should be set to I or I, P.
	Adding B frames to the mask will result in corrupt video. This field
	has to be set to the correct value in order to keep the timing correct.
Param[4]
	Mute audio: 0=disable, 1=enable
Param[5]
	Display 0=frame, 1=field
Param[6]
	Specifies the number of muted audio frames to play before normal audio
	resumes. (Not implemented in the firmware, leave at 0)

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Name 	CX2341X_DEC_STEP_VIDEO
Enum 	5/0x05
Description
	Each call to this API steps the playback to the next unit defined below
	in the current playback direction.
Param[0]
	0=frame, 1=top field, 2=bottom field

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Name 	CX2341X_DEC_SET_DMA_BLOCK_SIZE
Enum 	8/0x08
Description
	Set DMA transfer block size. Counterpart to API 0xC9
Param[0]
	DMA transfer block size in bytes. A different size may be specified
	when issuing the DMA transfer command.

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Name 	CX2341X_DEC_GET_XFER_INFO
Enum 	9/0x09
Description
	This API call may be used to detect an end of stream condition.
Result[0]
	Stream type
Result[1]
	Address offset
Result[2]
	Maximum bytes to transfer
Result[3]
	Buffer fullness

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Name 	CX2341X_DEC_GET_DMA_STATUS
Enum 	10/0x0A
Description
	Status of the last DMA transfer
Result[0]
	Bit 1 set means transfer complete
	Bit 2 set means DMA error
	Bit 3 set means linked list error
Result[1]
	DMA type: 0=MPEG, 1=OSD, 2=YUV

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Name 	CX2341X_DEC_SCHED_DMA_FROM_HOST
Enum 	11/0x0B
Description
	Setup DMA from host operation. Counterpart to API 0xCC
Param[0]
	Memory address of link list
Param[1]
	Total # of bytes to transfer
Param[2]
	DMA type (0=MPEG, 1=OSD, 2=YUV)

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Name 	CX2341X_DEC_PAUSE_PLAYBACK
Enum 	13/0x0D
Description
	Freeze playback immediately. In this mode, when internal buffers are
	full, no more data will be accepted and data request IRQs will be
	masked.
Param[0]
	Display: 0=last frame, 1=black

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Name 	CX2341X_DEC_HALT_FW
Enum 	14/0x0E
Description
	The firmware is halted and no further API calls are serviced until
	the firmware is uploaded again.

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Name 	CX2341X_DEC_SET_STANDARD
Enum 	16/0x10
Description
	Selects display standard
Param[0]
	0=NTSC, 1=PAL

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Name 	CX2341X_DEC_GET_VERSION
Enum 	17/0x11
Description
	Returns decoder firmware version information
Result[0]
	Version bitmask:
	    Bits  0:15 build
	    Bits 16:23 minor
	    Bits 24:31 major

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Name 	CX2341X_DEC_SET_STREAM_INPUT
Enum 	20/0x14
Description
	Select decoder stream input port
Param[0]
	0=memory (default), 1=streaming

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Name 	CX2341X_DEC_GET_TIMING_INFO
Enum 	21/0x15
Description
	Returns timing information from start of playback
Result[0]
	Frame count by decode order
Result[1]
	Video PTS bits 0:31 by display order
Result[2]
	Video PTS bit 32 by display order
Result[3]
	SCR bits 0:31 by display order
Result[4]
	SCR bit 32 by display order

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Name 	CX2341X_DEC_SET_AUDIO_MODE
Enum 	22/0x16
Description
	Select audio mode
Param[0]
	Dual mono mode action
	    0=Stereo, 1=Left, 2=Right, 3=Mono, 4=Swap, -1=Unchanged
Param[1]
	Stereo mode action:
	    0=Stereo, 1=Left, 2=Right, 3=Mono, 4=Swap, -1=Unchanged

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Name 	CX2341X_DEC_SET_EVENT_NOTIFICATION
Enum 	23/0x17
Description
	Setup firmware to notify the host about a particular event.
	Counterpart to API 0xD5
Param[0]
	Event: 0=Audio mode change between mono, (joint) stereo and dual channel.
	Event: 3=Decoder started
	Event: 4=Unknown: goes off 10-15 times per second while decoding.
	Event: 5=Some sync event: goes off once per frame.
Param[1]
	Notification 0=disabled, 1=enabled
Param[2]
	Interrupt bit
Param[3]
	Mailbox slot, -1 if no mailbox required.

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Name 	CX2341X_DEC_SET_DISPLAY_BUFFERS
Enum 	24/0x18
Description
	Number of display buffers. To decode all frames in reverse playback you
	must use nine buffers.
Param[0]
	0=six buffers, 1=nine buffers

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Name 	CX2341X_DEC_EXTRACT_VBI
Enum 	25/0x19
Description
	Extracts VBI data
Param[0]
	0=extract from extension & user data, 1=extract from private packets
Result[0]
	VBI table location
Result[1]
	VBI table size

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Name 	CX2341X_DEC_SET_DECODER_SOURCE
Enum 	26/0x1A
Description
	Selects decoder source. Ensure that the parameters passed to this
	API match the encoder settings.
Param[0]
	Mode: 0=MPEG from host, 1=YUV from encoder, 2=YUV from host
Param[1]
	YUV picture width
Param[2]
	YUV picture height
Param[3]
	Bitmap: see Param[0] of API 0xBD

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Name 	CX2341X_DEC_SET_PREBUFFERING
Enum 	30/0x1E
Description
	Decoder prebuffering, when enabled up to 128KB are buffered for
	streams <8mpbs or 640KB for streams >8mbps
Param[0]
	0=off, 1=on