mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
synced 2025-10-31 16:38:31 +00:00
d84e2bdca6
Document the program index table format, removed unused interrupt documentation and improve the documentation regarding the audio mode (stereo/joint/dual/mono). Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
298 lines
8.0 KiB
Plaintext
298 lines
8.0 KiB
Plaintext
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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-------------------------------------------------------------------------------
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Name CX2341X_DEC_PING_FW
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Enum 0/0x00
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Description
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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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-------------------------------------------------------------------------------
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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.
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Param[0]
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0 based frame number in GOP to begin playback from.
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Param[1]
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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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-------------------------------------------------------------------------------
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Name CX2341X_DEC_STOP_PLAYBACK
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Enum 2/0x02
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Description
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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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Display 0=last frame, 1=black
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Note: 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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PTS low
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Param[2]
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PTS high
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-------------------------------------------------------------------------------
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Name CX2341X_DEC_SET_PLAYBACK_SPEED
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Enum 3/0x03
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Description
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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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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: 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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Direction: 0=forward, 1=reverse
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Note: 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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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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B frames per GOP (for reverse play only)
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Note: 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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Mute audio: 0=disable, 1=enable
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Param[5]
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Display 0=frame, 1=field
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Param[6]
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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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-------------------------------------------------------------------------------
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Name CX2341X_DEC_STEP_VIDEO
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Enum 5/0x05
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Description
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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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0=frame, 1=top field, 2=bottom field
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-------------------------------------------------------------------------------
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Name CX2341X_DEC_SET_DMA_BLOCK_SIZE
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Enum 8/0x08
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Description
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Set DMA transfer block size. Counterpart to API 0xC9
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Param[0]
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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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-------------------------------------------------------------------------------
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Name CX2341X_DEC_GET_XFER_INFO
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Enum 9/0x09
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Description
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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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Stream type
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Result[1]
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Address offset
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Result[2]
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Maximum bytes to transfer
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Result[3]
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Buffer fullness
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-------------------------------------------------------------------------------
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Name CX2341X_DEC_GET_DMA_STATUS
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Enum 10/0x0A
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Description
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Status of the last DMA transfer
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Result[0]
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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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DMA type: 0=MPEG, 1=OSD, 2=YUV
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-------------------------------------------------------------------------------
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Name CX2341X_DEC_SCHED_DMA_FROM_HOST
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Enum 11/0x0B
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Description
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Setup DMA from host operation. Counterpart to API 0xCC
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Param[0]
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Memory address of link list
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Param[1]
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Total # of bytes to transfer
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Param[2]
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DMA type (0=MPEG, 1=OSD, 2=YUV)
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-------------------------------------------------------------------------------
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Name CX2341X_DEC_PAUSE_PLAYBACK
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Enum 13/0x0D
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Description
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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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Display: 0=last frame, 1=black
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-------------------------------------------------------------------------------
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Name CX2341X_DEC_HALT_FW
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Enum 14/0x0E
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Description
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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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-------------------------------------------------------------------------------
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Name CX2341X_DEC_SET_STANDARD
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Enum 16/0x10
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Description
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Selects display standard
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Param[0]
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0=NTSC, 1=PAL
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-------------------------------------------------------------------------------
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Name CX2341X_DEC_GET_VERSION
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Enum 17/0x11
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Description
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Returns decoder firmware version information
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Result[0]
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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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-------------------------------------------------------------------------------
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Name CX2341X_DEC_SET_STREAM_INPUT
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Enum 20/0x14
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Description
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Select decoder stream input port
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Param[0]
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0=memory (default), 1=streaming
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-------------------------------------------------------------------------------
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Name CX2341X_DEC_GET_TIMING_INFO
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Enum 21/0x15
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Description
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Returns timing information from start of playback
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Result[0]
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Frame count by decode order
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Result[1]
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Video PTS bits 0:31 by display order
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Result[2]
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Video PTS bit 32 by display order
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Result[3]
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SCR bits 0:31 by display order
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Result[4]
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SCR bit 32 by display order
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-------------------------------------------------------------------------------
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Name CX2341X_DEC_SET_AUDIO_MODE
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Enum 22/0x16
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Description
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Select audio mode
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Param[0]
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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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Stereo mode action:
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0=Stereo, 1=Left, 2=Right, 3=Mono, 4=Swap, -1=Unchanged
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-------------------------------------------------------------------------------
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Name CX2341X_DEC_SET_EVENT_NOTIFICATION
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Enum 23/0x17
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Description
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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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Event: 0=Audio mode change between mono, (joint) stereo and dual channel.
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Event: 3=Decoder started
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Event: 4=Unknown: goes off 10-15 times per second while decoding.
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Event: 5=Some sync event: goes off once per frame.
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Param[1]
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Notification 0=disabled, 1=enabled
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Param[2]
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Interrupt bit
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Param[3]
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Mailbox slot, -1 if no mailbox required.
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-------------------------------------------------------------------------------
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Name CX2341X_DEC_SET_DISPLAY_BUFFERS
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Enum 24/0x18
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Description
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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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0=six buffers, 1=nine buffers
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-------------------------------------------------------------------------------
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Name CX2341X_DEC_EXTRACT_VBI
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Enum 25/0x19
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Description
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Extracts VBI data
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Param[0]
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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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VBI table location
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Result[1]
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VBI table size
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-------------------------------------------------------------------------------
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Name CX2341X_DEC_SET_DECODER_SOURCE
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Enum 26/0x1A
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Description
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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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Mode: 0=MPEG from host, 1=YUV from encoder, 2=YUV from host
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Param[1]
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YUV picture width
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Param[2]
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YUV picture height
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Param[3]
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Bitmap: see Param[0] of API 0xBD
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-------------------------------------------------------------------------------
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Name CX2341X_DEC_SET_PREBUFFERING
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Enum 30/0x1E
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Description
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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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0=off, 1=on
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