[media] doc-rst: start adding documentation for cx2341x
move the contents of fw-decoder-api.txt to cx2341x and convert it to ReST file, adding it to media/v4l-drivers Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Mauro Carvalho Chehab
parent
d197a370d8
commit
a785ddb868
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@ -0,0 +1,564 @@
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The cx2341x driver
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==================
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Decoder firmware API description
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--------------------------------
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.. note:: this API is part of the decoder firmware, so it's cx23415 only.
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CX2341X_DEC_PING_FW
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-------------------
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Enum: 0/0x00
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Description
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~~~~~~~~~~~
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This API call does nothing. It may be used to check if the firmware
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is responding.
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CX2341X_DEC_START_PLAYBACK
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--------------------------
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Enum: 1/0x01
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Description
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~~~~~~~~~~~
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Begin or resume playback.
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Param[0]
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~~~~~~~~
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0 based frame number in GOP to begin playback from.
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Param[1]
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~~~~~~~~
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Specifies the number of muted audio frames to play before normal
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audio resumes. (This is not implemented in the firmware, leave at 0)
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CX2341X_DEC_STOP_PLAYBACK
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-------------------------
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Enum: 2/0x02
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Description
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~~~~~~~~~~~
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Ends playback and clears all decoder buffers. If PTS is not zero,
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playback stops at specified PTS.
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Param[0]
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~~~~~~~~
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Display 0=last frame, 1=black
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.. note::
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this takes effect immediately, so if you want to wait for a PTS,
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then use '0', otherwise the screen goes to black at once.
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You can call this later (even if there is no playback) with a 1 value
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to set the screen to black.
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Param[1]
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~~~~~~~~
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PTS low
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Param[2]
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~~~~~~~~
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PTS high
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CX2341X_DEC_SET_PLAYBACK_SPEED
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------------------------------
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Enum: 3/0x03
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Description
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~~~~~~~~~~~
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Playback stream at speed other than normal. There are two modes of
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operation:
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- Smooth: host transfers entire stream and firmware drops unused
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frames.
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- Coarse: host drops frames based on indexing as required to achieve
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desired speed.
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Param[0]
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~~~~~~~~
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.. code-block:: none
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Bitmap:
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0:7 0 normal
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1 fast only "1.5 times"
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n nX fast, 1/nX slow
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30 Framedrop:
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'0' during 1.5 times play, every other B frame is dropped
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'1' during 1.5 times play, stream is unchanged (bitrate
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must not exceed 8mbps)
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31 Speed:
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'0' slow
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'1' fast
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.. note::
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n is limited to 2. Anything higher does not result in
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faster playback. Instead the host should start dropping frames.
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Param[1]
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~~~~~~~~
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Direction: 0=forward, 1=reverse
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.. note::
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to make reverse playback work you have to write full GOPs in
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reverse order.
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Param[2]
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~~~~~~~~
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.. code-block:: none
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Picture mask:
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1=I frames
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3=I, P frames
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7=I, P, B frames
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Param[3]
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~~~~~~~~
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B frames per GOP (for reverse play only)
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.. note::
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for reverse playback the Picture Mask should be set to I or I, P.
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Adding B frames to the mask will result in corrupt video. This field
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has to be set to the correct value in order to keep the timing correct.
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Param[4]
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~~~~~~~~
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Mute audio: 0=disable, 1=enable
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Param[5]
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~~~~~~~~
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Display 0=frame, 1=field
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Param[6]
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~~~~~~~~
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Specifies the number of muted audio frames to play before normal audio
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resumes. (Not implemented in the firmware, leave at 0)
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CX2341X_DEC_STEP_VIDEO
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----------------------
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Enum: 5/0x05
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Description
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~~~~~~~~~~~
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Each call to this API steps the playback to the next unit defined below
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in the current playback direction.
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Param[0]
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~~~~~~~~
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0=frame, 1=top field, 2=bottom field
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CX2341X_DEC_SET_DMA_BLOCK_SIZE
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------------------------------
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Enum: 8/0x08
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Description
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~~~~~~~~~~~
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Set DMA transfer block size. Counterpart to API 0xC9
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Param[0]
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~~~~~~~~
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DMA transfer block size in bytes. A different size may be specified
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when issuing the DMA transfer command.
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CX2341X_DEC_GET_XFER_INFO
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-------------------------
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Enum: 9/0x09
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Description
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~~~~~~~~~~~
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This API call may be used to detect an end of stream condition.
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Result[0]
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~~~~~~~~~
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Stream type
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Result[1]
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~~~~~~~~~
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Address offset
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Result[2]
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~~~~~~~~~
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Maximum bytes to transfer
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Result[3]
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~~~~~~~~~
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Buffer fullness
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CX2341X_DEC_GET_DMA_STATUS
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--------------------------
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Enum: 10/0x0A
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Description
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~~~~~~~~~~~
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Status of the last DMA transfer
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Result[0]
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~~~~~~~~~
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Bit 1 set means transfer complete
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Bit 2 set means DMA error
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Bit 3 set means linked list error
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Result[1]
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~~~~~~~~~
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DMA type: 0=MPEG, 1=OSD, 2=YUV
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CX2341X_DEC_SCHED_DMA_FROM_HOST
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-------------------------------
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Enum: 11/0x0B
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Description
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~~~~~~~~~~~
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Setup DMA from host operation. Counterpart to API 0xCC
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Param[0]
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~~~~~~~~
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Memory address of link list
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Param[1]
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~~~~~~~~
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Total # of bytes to transfer
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Param[2]
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~~~~~~~~
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DMA type (0=MPEG, 1=OSD, 2=YUV)
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CX2341X_DEC_PAUSE_PLAYBACK
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--------------------------
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Enum: 13/0x0D
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Description
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~~~~~~~~~~~
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Freeze playback immediately. In this mode, when internal buffers are
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full, no more data will be accepted and data request IRQs will be
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masked.
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Param[0]
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~~~~~~~~
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Display: 0=last frame, 1=black
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CX2341X_DEC_HALT_FW
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-------------------
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Enum: 14/0x0E
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Description
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~~~~~~~~~~~
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The firmware is halted and no further API calls are serviced until
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the firmware is uploaded again.
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CX2341X_DEC_SET_STANDARD
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------------------------
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Enum: 16/0x10
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Description
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~~~~~~~~~~~
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Selects display standard
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Param[0]
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~~~~~~~~
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0=NTSC, 1=PAL
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CX2341X_DEC_GET_VERSION
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-----------------------
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Enum: 17/0x11
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Description
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~~~~~~~~~~~
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Returns decoder firmware version information
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Result[0]
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~~~~~~~~~
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Version bitmask:
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- Bits 0:15 build
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- Bits 16:23 minor
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- Bits 24:31 major
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CX2341X_DEC_SET_STREAM_INPUT
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----------------------------
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Enum: 20/0x14
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Description
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~~~~~~~~~~~
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Select decoder stream input port
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Param[0]
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~~~~~~~~
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0=memory (default), 1=streaming
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CX2341X_DEC_GET_TIMING_INFO
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---------------------------
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Enum: 21/0x15
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Description
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~~~~~~~~~~~
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Returns timing information from start of playback
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Result[0]
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~~~~~~~~~
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Frame count by decode order
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Result[1]
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~~~~~~~~~
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Video PTS bits 0:31 by display order
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Result[2]
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~~~~~~~~~
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Video PTS bit 32 by display order
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Result[3]
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~~~~~~~~~
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SCR bits 0:31 by display order
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Result[4]
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~~~~~~~~~
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SCR bit 32 by display order
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CX2341X_DEC_SET_AUDIO_MODE
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--------------------------
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Enum: 22/0x16
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Description
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~~~~~~~~~~~
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Select audio mode
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Param[0]
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~~~~~~~~
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Dual mono mode action
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0=Stereo, 1=Left, 2=Right, 3=Mono, 4=Swap, -1=Unchanged
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Param[1]
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~~~~~~~~
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Stereo mode action:
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0=Stereo, 1=Left, 2=Right, 3=Mono, 4=Swap, -1=Unchanged
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CX2341X_DEC_SET_EVENT_NOTIFICATION
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----------------------------------
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Enum: 23/0x17
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Description
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~~~~~~~~~~~
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Setup firmware to notify the host about a particular event.
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Counterpart to API 0xD5
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Param[0]
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~~~~~~~~
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Event:
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- 0=Audio mode change between mono, (joint) stereo and dual channel.
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- 3=Decoder started
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- 4=Unknown: goes off 10-15 times per second while decoding.
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- 5=Some sync event: goes off once per frame.
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Param[1]
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~~~~~~~~
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Notification 0=disabled, 1=enabled
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Param[2]
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~~~~~~~~
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Interrupt bit
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Param[3]
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~~~~~~~~
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Mailbox slot, -1 if no mailbox required.
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CX2341X_DEC_SET_DISPLAY_BUFFERS
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-------------------------------
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Enum: 24/0x18
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Description
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~~~~~~~~~~~
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Number of display buffers. To decode all frames in reverse playback you
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must use nine buffers.
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Param[0]
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~~~~~~~~
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0=six buffers, 1=nine buffers
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CX2341X_DEC_EXTRACT_VBI
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-----------------------
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Enum: 25/0x19
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Description
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~~~~~~~~~~~
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Extracts VBI data
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Param[0]
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~~~~~~~~
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0=extract from extension & user data, 1=extract from private packets
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Result[0]
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~~~~~~~~~
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VBI table location
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Result[1]
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~~~~~~~~~
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VBI table size
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CX2341X_DEC_SET_DECODER_SOURCE
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------------------------------
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Enum: 26/0x1A
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Description
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~~~~~~~~~~~
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Selects decoder source. Ensure that the parameters passed to this
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API match the encoder settings.
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Param[0]
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~~~~~~~~
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Mode: 0=MPEG from host, 1=YUV from encoder, 2=YUV from host
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Param[1]
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~~~~~~~~
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YUV picture width
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Param[2]
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~~~~~~~~
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YUV picture height
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Param[3]
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~~~~~~~~
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Bitmap: see Param[0] of API 0xBD
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CX2341X_DEC_SET_PREBUFFERING
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----------------------------
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Enum: 30/0x1E
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Description
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~~~~~~~~~~~
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Decoder prebuffering, when enabled up to 128KB are buffered for
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streams <8mpbs or 640KB for streams >8mbps
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Param[0]
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~~~~~~~~
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0=off, 1=on
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@ -27,6 +27,7 @@ License".
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cafe_ccic
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cpia2
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cx18
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cx2341x
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cx88
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davinci-vpbe
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fimc
|
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|
|
|
|||
|
|
@ -1,297 +0,0 @@
|
|||
Decoder firmware API description
|
||||
================================
|
||||
|
||||
Note: this API is part of the decoder firmware, so it's cx23415 only.
|
||||
|
||||
-------------------------------------------------------------------------------
|
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|
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Name CX2341X_DEC_PING_FW
|
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Enum 0/0x00
|
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Description
|
||||
This API call does nothing. It may be used to check if the firmware
|
||||
is responding.
|
||||
|
||||
-------------------------------------------------------------------------------
|
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|
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Name CX2341X_DEC_START_PLAYBACK
|
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Enum 1/0x01
|
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Description
|
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Begin or resume playback.
|
||||
Param[0]
|
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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)
|
||||
|
||||
-------------------------------------------------------------------------------
|
||||
|
||||
Name CX2341X_DEC_STOP_PLAYBACK
|
||||
Enum 2/0x02
|
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Description
|
||||
Ends playback and clears all decoder buffers. If PTS is not zero,
|
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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]
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PTS high
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|
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-------------------------------------------------------------------------------
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Name CX2341X_DEC_SET_PLAYBACK_SPEED
|
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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:
|
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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)
|
||||
|
||||
-------------------------------------------------------------------------------
|
||||
|
||||
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 condition.
|
||||
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
|
||||
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
|
||||
|
||||
-------------------------------------------------------------------------------
|
||||
|
||||
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.
|
||||
|
||||
-------------------------------------------------------------------------------
|
||||
|
||||
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_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
|
||||
Loading…
Reference in New Issue