--- /dev/null
+Decoder firmware API description
+================================
+
+Note: this API is part of the decoder firmware, so it's cx23415 only.
+
+-------------------------------------------------------------------------------
+
+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.
+
+-------------------------------------------------------------------------------
+
+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.
+
+-------------------------------------------------------------------------------
+
+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
+Param[1]
+ PTS low
+Param[2]
+ PTS high
+
+-------------------------------------------------------------------------------
+
+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
+Param[1]
+ Direction: 0=forward, 1=reverse
+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)
+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.
+
+-------------------------------------------------------------------------------
+
+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
+
+-------------------------------------------------------------------------------
+
+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.
+
+-------------------------------------------------------------------------------
+
+Name CX2341X_DEC_GET_XFER_INFO
+Enum 9/0x09
+Description
+ This API call may be used to detect an end of stream condtion.
+Result[0]
+ Stream type
+Result[1]
+ Address offset
+Result[2]
+ Maximum bytes to transfer
+Result[3]
+ Buffer fullness
+
+-------------------------------------------------------------------------------
+
+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
+
+-------------------------------------------------------------------------------
+
+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)
+
+-------------------------------------------------------------------------------
+
+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
+
+-------------------------------------------------------------------------------
+
+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.
+
+-------------------------------------------------------------------------------
+
+Name CX2341X_DEC_SET_STANDARD
+Enum 16/0x10
+Description
+ Selects display standard
+Param[0]
+ 0=NTSC, 1=PAL
+
+-------------------------------------------------------------------------------
+
+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
+
+-------------------------------------------------------------------------------
+
+Name CX2341X_DEC_SET_STREAM_INPUT
+Enum 20/0x14
+Description
+ Select decoder stream input port
+Param[0]
+ 0=memory (default), 1=streaming
+
+-------------------------------------------------------------------------------
+
+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
+
+-------------------------------------------------------------------------------
+
+Name CX2341X_DEC_SET_AUDIO_MODE
+Enum 22/0x16
+Description
+ Select audio mode
+Param[0]
+ Dual mono mode action
+Param[1]
+ Stereo mode action:
+ 0=Stereo, 1=Left, 2=Right, 3=Mono, 4=Swap, -1=Unchanged
+
+-------------------------------------------------------------------------------
+
+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 stereo and dual channel
+Param[1]
+ Notification 0=disabled, 1=enabled
+Param[2]
+ Interrupt bit
+Param[3]
+ Mailbox slot, -1 if no mailbox required.
+
+-------------------------------------------------------------------------------
+
+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
+
+-------------------------------------------------------------------------------
+
+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
+
+-------------------------------------------------------------------------------
+
+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
+
+-------------------------------------------------------------------------------
+
+Name CX2341X_DEC_SET_AUDIO_OUTPUT
+Enum 27/0x1B
+Description
+ Select audio output format
+Param[0]
+ Bitmask:
+ 0:1 Data size:
+ '00' 16 bit
+ '01' 20 bit
+ '10' 24 bit
+ 2:7 Unused
+ 8:9 Mode:
+ '00' 2 channels
+ '01' 4 channels
+ '10' 6 channels
+ '11' 6 channels with one line data mode
+ (for left justified MSB first mode, 20 bit only)
+ 10:11 Unused
+ 12:13 Channel format:
+ '00' right justified MSB first mode
+ '01' left justified MSB first mode
+ '10' I2S mode
+ 14:15 Unused
+ 16:21 Right justify bit count
+ 22:31 Unused
+
+-------------------------------------------------------------------------------
+
+Name CX2341X_DEC_SET_AV_DELAY
+Enum 28/0x1C
+Description
+ Set audio/video delay in 90Khz ticks
+Param[0]
+ 0=A/V in sync, negative=audio lags, positive=video lags
+
+-------------------------------------------------------------------------------
+
+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
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