Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 3685 insertions, 0 deletions

diff --git a/Documentation/driver-api/media/drivers/cx2341x-devel.rst b/Documentation/driver-api/media/drivers/cx2341x-devel.rst
new file mode 100644
index 000000000..97699df6e
--- /dev/null
+++ b/Documentation/driver-api/media/drivers/cx2341x-devel.rst
@@ -0,0 +1,3685 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+The cx2341x driver
+==================
+
+Memory at cx2341x chips
+-----------------------
+
+This section describes the cx2341x memory map and documents some of the
+register space.
+
+.. note:: the memory long words are little-endian ('intel format').
+
+.. warning::
+
+	This information was figured out from searching through the memory
+	and registers, this information may not be correct and is certainly
+	not complete, and was not derived from anything more than searching
+	through the memory space with commands like:
+
+	.. code-block:: none
+
+		ivtvctl -O min=0x02000000,max=0x020000ff
+
+	So take this as is, I'm always searching for more stuff, it's a large
+	register space :-).
+
+Memory Map
+~~~~~~~~~~
+
+The cx2341x exposes its entire 64M memory space to the PCI host via the PCI BAR0
+(Base Address Register 0). The addresses here are offsets relative to the
+address held in BAR0.
+
+.. code-block:: none
+
+	0x00000000-0x00ffffff Encoder memory space
+	0x00000000-0x0003ffff Encode.rom
+	???-???         MPEG buffer(s)
+	???-???         Raw video capture buffer(s)
+	???-???         Raw audio capture buffer(s)
+	???-???         Display buffers (6 or 9)
+
+	0x01000000-0x01ffffff Decoder memory space
+	0x01000000-0x0103ffff Decode.rom
+	???-???         MPEG buffers(s)
+	0x0114b000-0x0115afff Audio.rom (deprecated?)
+
+	0x02000000-0x0200ffff Register Space
+
+Registers
+~~~~~~~~~
+
+The registers occupy the 64k space starting at the 0x02000000 offset from BAR0.
+All of these registers are 32 bits wide.
+
+.. code-block:: none
+
+	DMA Registers 0x000-0xff:
+
+	0x00 - Control:
+		0=reset/cancel, 1=read, 2=write, 4=stop
+	0x04 - DMA status:
+		1=read busy, 2=write busy, 4=read error, 8=write error, 16=link list error
+	0x08 - pci DMA pointer for read link list
+	0x0c - pci DMA pointer for write link list
+	0x10 - read/write DMA enable:
+		1=read enable, 2=write enable
+	0x14 - always 0xffffffff, if set any lower instability occurs, 0x00 crashes
+	0x18 - ??
+	0x1c - always 0x20 or 32, smaller values slow down DMA transactions
+	0x20 - always value of 0x780a010a
+	0x24-0x3c - usually just random values???
+	0x40 - Interrupt status
+	0x44 - Write a bit here and shows up in Interrupt status 0x40
+	0x48 - Interrupt Mask
+	0x4C - always value of 0xfffdffff,
+		if changed to 0xffffffff DMA write interrupts break.
+	0x50 - always 0xffffffff
+	0x54 - always 0xffffffff (0x4c, 0x50, 0x54 seem like interrupt masks, are
+		3 processors on chip, Java ones, VPU, SPU, APU, maybe these are the
+		interrupt masks???).
+	0x60-0x7C - random values
+	0x80 - first write linked list reg, for Encoder Memory addr
+	0x84 - first write linked list reg, for pci memory addr
+	0x88 - first write linked list reg, for length of buffer in memory addr
+		(|0x80000000 or this for last link)
+	0x8c-0xdc - rest of write linked list reg, 8 sets of 3 total, DMA goes here
+		from linked list addr in reg 0x0c, firmware must push through or
+		something.
+	0xe0 - first (and only) read linked list reg, for pci memory addr
+	0xe4 - first (and only) read linked list reg, for Decoder memory addr
+	0xe8 - first (and only) read linked list reg, for length of buffer
+	0xec-0xff - Nothing seems to be in these registers, 0xec-f4 are 0x00000000.
+
+Memory locations for Encoder Buffers 0x700-0x7ff:
+
+These registers show offsets of memory locations pertaining to each
+buffer area used for encoding, have to shift them by <<1 first.
+
+- 0x07F8: Encoder SDRAM refresh
+- 0x07FC: Encoder SDRAM pre-charge
+
+Memory locations for Decoder Buffers 0x800-0x8ff:
+
+These registers show offsets of memory locations pertaining to each
+buffer area used for decoding, have to shift them by <<1 first.
+
+- 0x08F8: Decoder SDRAM refresh
+- 0x08FC: Decoder SDRAM pre-charge
+
+Other memory locations:
+
+- 0x2800: Video Display Module control
+- 0x2D00: AO (audio output?) control
+- 0x2D24: Bytes Flushed
+- 0x7000: LSB I2C write clock bit (inverted)
+- 0x7004: LSB I2C write data bit (inverted)
+- 0x7008: LSB I2C read clock bit
+- 0x700c: LSB I2C read data bit
+- 0x9008: GPIO get input state
+- 0x900c: GPIO set output state
+- 0x9020: GPIO direction (Bit7 (GPIO 0..7) - 0:input, 1:output)
+- 0x9050: SPU control
+- 0x9054: Reset HW blocks
+- 0x9058: VPU control
+- 0xA018: Bit6: interrupt pending?
+- 0xA064: APU command
+
+
+Interrupt Status Register
+~~~~~~~~~~~~~~~~~~~~~~~~~
+
+The definition of the bits in the interrupt status register 0x0040, and the
+interrupt mask 0x0048. If a bit is cleared in the mask, then we want our ISR to
+execute.
+
+- bit 31 Encoder Start Capture
+- bit 30 Encoder EOS
+- bit 29 Encoder VBI capture
+- bit 28 Encoder Video Input Module reset event
+- bit 27 Encoder DMA complete
+- bit 24 Decoder audio mode change detection event (through event notification)
+- bit 22 Decoder data request
+- bit 20 Decoder DMA complete
+- bit 19 Decoder VBI re-insertion
+- bit 18 Decoder DMA err (linked-list bad)
+
+Missing documentation
+---------------------
+
+- Encoder API post(?)
+- Decoder API post(?)
+- Decoder VTRACE event
+
+
+The cx2341x firmware upload
+---------------------------
+
+This document describes how to upload the cx2341x firmware to the card.
+
+How to find
+~~~~~~~~~~~
+
+See the web pages of the various projects that uses this chip for information
+on how to obtain the firmware.
+
+The firmware stored in a Windows driver can be detected as follows:
+
+- Each firmware image is 256k bytes.
+- The 1st 32-bit word of the Encoder image is 0x0000da7
+- The 1st 32-bit word of the Decoder image is 0x00003a7
+- The 2nd 32-bit word of both images is 0xaa55bb66
+
+How to load
+~~~~~~~~~~~
+
+- Issue the FWapi command to stop the encoder if it is running. Wait for the
+  command to complete.
+- Issue the FWapi command to stop the decoder if it is running. Wait for the
+  command to complete.
+- Issue the I2C command to the digitizer to stop emitting VSYNC events.
+- Issue the FWapi command to halt the encoder's firmware.
+- Sleep for 10ms.
+- Issue the FWapi command to halt the decoder's firmware.
+- Sleep for 10ms.
+- Write 0x00000000 to register 0x2800 to stop the Video Display Module.
+- Write 0x00000005 to register 0x2D00 to stop the AO (audio output?).
+- Write 0x00000000 to register 0xA064 to ping? the APU.
+- Write 0xFFFFFFFE to register 0x9058 to stop the VPU.
+- Write 0xFFFFFFFF to register 0x9054 to reset the HW blocks.
+- Write 0x00000001 to register 0x9050 to stop the SPU.
+- Sleep for 10ms.
+- Write 0x0000001A to register 0x07FC to init the Encoder SDRAM's pre-charge.
+- Write 0x80000640 to register 0x07F8 to init the Encoder SDRAM's refresh to 1us.
+- Write 0x0000001A to register 0x08FC to init the Decoder SDRAM's pre-charge.
+- Write 0x80000640 to register 0x08F8 to init the Decoder SDRAM's refresh to 1us.
+- Sleep for 512ms. (600ms is recommended)
+- Transfer the encoder's firmware image to offset 0 in Encoder memory space.
+- Transfer the decoder's firmware image to offset 0 in Decoder memory space.
+- Use a read-modify-write operation to Clear bit 0 of register 0x9050 to
+  re-enable the SPU.
+- Sleep for 1 second.
+- Use a read-modify-write operation to Clear bits 3 and 0 of register 0x9058
+  to re-enable the VPU.
+- Sleep for 1 second.
+- Issue status API commands to both firmware images to verify.
+
+
+How to call the firmware API
+----------------------------
+
+The preferred calling convention is known as the firmware mailbox. The
+mailboxes are basically a fixed length array that serves as the call-stack.
+
+Firmware mailboxes can be located by searching the encoder and decoder memory
+for a 16 byte signature. That signature will be located on a 256-byte boundary.
+
+Signature:
+
+.. code-block:: none
+
+	0x78, 0x56, 0x34, 0x12, 0x12, 0x78, 0x56, 0x34,
+	0x34, 0x12, 0x78, 0x56, 0x56, 0x34, 0x12, 0x78
+
+The firmware implements 20 mailboxes of 20 32-bit words. The first 10 are
+reserved for API calls. The second 10 are used by the firmware for event
+notification.
+
+  ====== =================
+  Index  Name
+  ====== =================
+  0      Flags
+  1      Command
+  2      Return value
+  3      Timeout
+  4-19   Parameter/Result
+  ====== =================
+
+
+The flags are defined in the following table. The direction is from the
+perspective of the firmware.
+
+  ==== ========== ============================================
+  Bit  Direction  Purpose
+  ==== ========== ============================================
+  2    O          Firmware has processed the command.
+  1    I          Driver has finished setting the parameters.
+  0    I          Driver is using this mailbox.
+  ==== ========== ============================================
+
+The command is a 32-bit enumerator. The API specifics may be found in this
+chapter.
+
+The return value is a 32-bit enumerator. Only two values are currently defined:
+
+- 0=success
+- -1=command undefined.
+
+There are 16 parameters/results 32-bit fields. The driver populates these fields
+with values for all the parameters required by the call. The driver overwrites
+these fields with result values returned by the call.
+
+The timeout value protects the card from a hung driver thread. If the driver
+doesn't handle the completed call within the timeout specified, the firmware
+will reset that mailbox.
+
+To make an API call, the driver iterates over each mailbox looking for the
+first one available (bit 0 has been cleared). The driver sets that bit, fills
+in the command enumerator, the timeout value and any required parameters. The
+driver then sets the parameter ready bit (bit 1). The firmware scans the
+mailboxes for pending commands, processes them, sets the result code, populates
+the result value array with that call's return values and sets the call
+complete bit (bit 2). Once bit 2 is set, the driver should retrieve the results
+and clear all the flags. If the driver does not perform this task within the
+time set in the timeout register, the firmware will reset that mailbox.
+
+Event notifications are sent from the firmware to the host. The host tells the
+firmware which events it is interested in via an API call. That call tells the
+firmware which notification mailbox to use. The firmware signals the host via
+an interrupt. Only the 16 Results fields are used, the Flags, Command, Return
+value and Timeout words are not used.
+
+
+OSD firmware API description
+----------------------------
+
+.. note:: this API is part of the decoder firmware, so it's cx23415 only.
+
+
+
+CX2341X_OSD_GET_FRAMEBUFFER
+~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 65/0x41
+
+Description
+^^^^^^^^^^^
+
+Return base and length of contiguous OSD memory.
+
+Result[0]
+^^^^^^^^^
+
+OSD base address
+
+Result[1]
+^^^^^^^^^
+
+OSD length
+
+
+
+CX2341X_OSD_GET_PIXEL_FORMAT
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 66/0x42
+
+Description
+^^^^^^^^^^^
+
+Query OSD format
+
+Result[0]
+^^^^^^^^^
+
+0=8bit index
+1=16bit RGB 5:6:5
+2=16bit ARGB 1:5:5:5
+3=16bit ARGB 1:4:4:4
+4=32bit ARGB 8:8:8:8
+
+
+
+CX2341X_OSD_SET_PIXEL_FORMAT
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 67/0x43
+
+Description
+^^^^^^^^^^^
+
+Assign pixel format
+
+Param[0]
+^^^^^^^^
+
+- 0=8bit index
+- 1=16bit RGB 5:6:5
+- 2=16bit ARGB 1:5:5:5
+- 3=16bit ARGB 1:4:4:4
+- 4=32bit ARGB 8:8:8:8
+
+
+
+CX2341X_OSD_GET_STATE
+~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 68/0x44
+
+Description
+^^^^^^^^^^^
+
+Query OSD state
+
+Result[0]
+^^^^^^^^^
+
+- Bit  0   0=off, 1=on
+- Bits 1:2 alpha control
+- Bits 3:5 pixel format
+
+
+
+CX2341X_OSD_SET_STATE
+~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 69/0x45
+
+Description
+^^^^^^^^^^^
+
+OSD switch
+
+Param[0]
+^^^^^^^^
+
+0=off, 1=on
+
+
+
+CX2341X_OSD_GET_OSD_COORDS
+~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 70/0x46
+
+Description
+^^^^^^^^^^^
+
+Retrieve coordinates of OSD area blended with video
+
+Result[0]
+^^^^^^^^^
+
+OSD buffer address
+
+Result[1]
+^^^^^^^^^
+
+Stride in pixels
+
+Result[2]
+^^^^^^^^^
+
+Lines in OSD buffer
+
+Result[3]
+^^^^^^^^^
+
+Horizontal offset in buffer
+
+Result[4]
+^^^^^^^^^
+
+Vertical offset in buffer
+
+
+
+CX2341X_OSD_SET_OSD_COORDS
+~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 71/0x47
+
+Description
+^^^^^^^^^^^
+
+Assign the coordinates of the OSD area to blend with video
+
+Param[0]
+^^^^^^^^
+
+buffer address
+
+Param[1]
+^^^^^^^^
+
+buffer stride in pixels
+
+Param[2]
+^^^^^^^^
+
+lines in buffer
+
+Param[3]
+^^^^^^^^
+
+horizontal offset
+
+Param[4]
+^^^^^^^^
+
+vertical offset
+
+
+
+CX2341X_OSD_GET_SCREEN_COORDS
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 72/0x48
+
+Description
+^^^^^^^^^^^
+
+Retrieve OSD screen area coordinates
+
+Result[0]
+^^^^^^^^^
+
+top left horizontal offset
+
+Result[1]
+^^^^^^^^^
+
+top left vertical offset
+
+Result[2]
+^^^^^^^^^
+
+bottom right horizontal offset
+
+Result[3]
+^^^^^^^^^
+
+bottom right vertical offset
+
+
+
+CX2341X_OSD_SET_SCREEN_COORDS
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 73/0x49
+
+Description
+^^^^^^^^^^^
+
+Assign the coordinates of the screen area to blend with video
+
+Param[0]
+^^^^^^^^
+
+top left horizontal offset
+
+Param[1]
+^^^^^^^^
+
+top left vertical offset
+
+Param[2]
+^^^^^^^^
+
+bottom left horizontal offset
+
+Param[3]
+^^^^^^^^
+
+bottom left vertical offset
+
+
+
+CX2341X_OSD_GET_GLOBAL_ALPHA
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 74/0x4A
+
+Description
+^^^^^^^^^^^
+
+Retrieve OSD global alpha
+
+Result[0]
+^^^^^^^^^
+
+global alpha: 0=off, 1=on
+
+Result[1]
+^^^^^^^^^
+
+bits 0:7 global alpha
+
+
+
+CX2341X_OSD_SET_GLOBAL_ALPHA
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 75/0x4B
+
+Description
+^^^^^^^^^^^
+
+Update global alpha
+
+Param[0]
+^^^^^^^^
+
+global alpha: 0=off, 1=on
+
+Param[1]
+^^^^^^^^
+
+global alpha (8 bits)
+
+Param[2]
+^^^^^^^^
+
+local alpha: 0=on, 1=off
+
+
+
+CX2341X_OSD_SET_BLEND_COORDS
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 78/0x4C
+
+Description
+^^^^^^^^^^^
+
+Move start of blending area within display buffer
+
+Param[0]
+^^^^^^^^
+
+horizontal offset in buffer
+
+Param[1]
+^^^^^^^^
+
+vertical offset in buffer
+
+
+
+CX2341X_OSD_GET_FLICKER_STATE
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 79/0x4F
+
+Description
+^^^^^^^^^^^
+
+Retrieve flicker reduction module state
+
+Result[0]
+^^^^^^^^^
+
+flicker state: 0=off, 1=on
+
+
+
+CX2341X_OSD_SET_FLICKER_STATE
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 80/0x50
+
+Description
+^^^^^^^^^^^
+
+Set flicker reduction module state
+
+Param[0]
+^^^^^^^^
+
+State: 0=off, 1=on
+
+
+
+CX2341X_OSD_BLT_COPY
+~~~~~~~~~~~~~~~~~~~~
+
+Enum: 82/0x52
+
+Description
+^^^^^^^^^^^
+
+BLT copy
+
+Param[0]
+^^^^^^^^
+
+.. code-block:: none
+
+	'0000'  zero
+	'0001' ~destination AND ~source
+	'0010' ~destination AND  source
+	'0011' ~destination
+	'0100'  destination AND ~source
+	'0101'                  ~source
+	'0110'  destination XOR  source
+	'0111' ~destination OR  ~source
+	'1000' ~destination AND ~source
+	'1001'  destination XNOR source
+	'1010'                   source
+	'1011' ~destination OR   source
+	'1100'  destination
+	'1101'  destination OR  ~source
+	'1110'  destination OR   source
+	'1111'  one
+
+
+Param[1]
+^^^^^^^^
+
+Resulting alpha blending
+
+- '01' source_alpha
+- '10' destination_alpha
+- '11' source_alpha*destination_alpha+1
+  (zero if both source and destination alpha are zero)
+
+Param[2]
+^^^^^^^^
+
+.. code-block:: none
+
+	'00' output_pixel = source_pixel
+
+	'01' if source_alpha=0:
+		 output_pixel = destination_pixel
+	     if 256 > source_alpha > 1:
+		 output_pixel = ((source_alpha + 1)*source_pixel +
+				 (255 - source_alpha)*destination_pixel)/256
+
+	'10' if destination_alpha=0:
+		 output_pixel = source_pixel
+	      if 255 > destination_alpha > 0:
+		 output_pixel = ((255 - destination_alpha)*source_pixel +
+				 (destination_alpha + 1)*destination_pixel)/256
+
+	'11' if source_alpha=0:
+		 source_temp = 0
+	     if source_alpha=255:
+		 source_temp = source_pixel*256
+	     if 255 > source_alpha > 0:
+		 source_temp = source_pixel*(source_alpha + 1)
+	     if destination_alpha=0:
+		 destination_temp = 0
+	     if destination_alpha=255:
+		 destination_temp = destination_pixel*256
+	     if 255 > destination_alpha > 0:
+		 destination_temp = destination_pixel*(destination_alpha + 1)
+	     output_pixel = (source_temp + destination_temp)/256
+
+Param[3]
+^^^^^^^^
+
+width
+
+Param[4]
+^^^^^^^^
+
+height
+
+Param[5]
+^^^^^^^^
+
+destination pixel mask
+
+Param[6]
+^^^^^^^^
+
+destination rectangle start address
+
+Param[7]
+^^^^^^^^
+
+destination stride in dwords
+
+Param[8]
+^^^^^^^^
+
+source stride in dwords
+
+Param[9]
+^^^^^^^^
+
+source rectangle start address
+
+
+
+CX2341X_OSD_BLT_FILL
+~~~~~~~~~~~~~~~~~~~~
+
+Enum: 83/0x53
+
+Description
+^^^^^^^^^^^
+
+BLT fill color
+
+Param[0]
+^^^^^^^^
+
+Same as Param[0] on API 0x52
+
+Param[1]
+^^^^^^^^
+
+Same as Param[1] on API 0x52
+
+Param[2]
+^^^^^^^^
+
+Same as Param[2] on API 0x52
+
+Param[3]
+^^^^^^^^
+
+width
+
+Param[4]
+^^^^^^^^
+
+height
+
+Param[5]
+^^^^^^^^
+
+destination pixel mask
+
+Param[6]
+^^^^^^^^
+
+destination rectangle start address
+
+Param[7]
+^^^^^^^^
+
+destination stride in dwords
+
+Param[8]
+^^^^^^^^
+
+color fill value
+
+
+
+CX2341X_OSD_BLT_TEXT
+~~~~~~~~~~~~~~~~~~~~
+
+Enum: 84/0x54
+
+Description
+^^^^^^^^^^^
+
+BLT for 8 bit alpha text source
+
+Param[0]
+^^^^^^^^
+
+Same as Param[0] on API 0x52
+
+Param[1]
+^^^^^^^^
+
+Same as Param[1] on API 0x52
+
+Param[2]
+^^^^^^^^
+
+Same as Param[2] on API 0x52
+
+Param[3]
+^^^^^^^^
+
+width
+
+Param[4]
+^^^^^^^^
+
+height
+
+Param[5]
+^^^^^^^^
+
+destination pixel mask
+
+Param[6]
+^^^^^^^^
+
+destination rectangle start address
+
+Param[7]
+^^^^^^^^
+
+destination stride in dwords
+
+Param[8]
+^^^^^^^^
+
+source stride in dwords
+
+Param[9]
+^^^^^^^^
+
+source rectangle start address
+
+Param[10]
+^^^^^^^^^
+
+color fill value
+
+
+
+CX2341X_OSD_SET_FRAMEBUFFER_WINDOW
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 86/0x56
+
+Description
+^^^^^^^^^^^
+
+Positions the main output window on the screen. The coordinates must be
+such that the entire window fits on the screen.
+
+Param[0]
+^^^^^^^^
+
+window width
+
+Param[1]
+^^^^^^^^
+
+window height
+
+Param[2]
+^^^^^^^^
+
+top left window corner horizontal offset
+
+Param[3]
+^^^^^^^^
+
+top left window corner vertical offset
+
+
+
+CX2341X_OSD_SET_CHROMA_KEY
+~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 96/0x60
+
+Description
+^^^^^^^^^^^
+
+Chroma key switch and color
+
+Param[0]
+^^^^^^^^
+
+state: 0=off, 1=on
+
+Param[1]
+^^^^^^^^
+
+color
+
+
+
+CX2341X_OSD_GET_ALPHA_CONTENT_INDEX
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 97/0x61
+
+Description
+^^^^^^^^^^^
+
+Retrieve alpha content index
+
+Result[0]
+^^^^^^^^^
+
+alpha content index, Range 0:15
+
+
+
+CX2341X_OSD_SET_ALPHA_CONTENT_INDEX
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 98/0x62
+
+Description
+^^^^^^^^^^^
+
+Assign alpha content index
+
+Param[0]
+^^^^^^^^
+
+alpha content index, range 0:15
+
+
+Encoder firmware API description
+--------------------------------
+
+CX2341X_ENC_PING_FW
+~~~~~~~~~~~~~~~~~~~
+
+Enum: 128/0x80
+
+Description
+^^^^^^^^^^^
+
+Does nothing. Can be used to check if the firmware is responding.
+
+
+
+CX2341X_ENC_START_CAPTURE
+~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 129/0x81
+
+Description
+^^^^^^^^^^^
+
+Commences the capture of video, audio and/or VBI data. All encoding
+parameters must be initialized prior to this API call. Captures frames
+continuously or until a predefined number of frames have been captured.
+
+Param[0]
+^^^^^^^^
+
+Capture stream type:
+
+	- 0=MPEG
+	- 1=Raw
+	- 2=Raw passthrough
+	- 3=VBI
+
+
+Param[1]
+^^^^^^^^
+
+Bitmask:
+
+	- Bit 0 when set, captures YUV
+	- Bit 1 when set, captures PCM audio
+	- Bit 2 when set, captures VBI (same as param[0]=3)
+	- Bit 3 when set, the capture destination is the decoder
+	  (same as param[0]=2)
+	- Bit 4 when set, the capture destination is the host
+
+.. note:: this parameter is only meaningful for RAW capture type.
+
+
+
+CX2341X_ENC_STOP_CAPTURE
+~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 130/0x82
+
+Description
+^^^^^^^^^^^
+
+Ends a capture in progress
+
+Param[0]
+^^^^^^^^
+
+- 0=stop at end of GOP (generates IRQ)
+- 1=stop immediate (no IRQ)
+
+Param[1]
+^^^^^^^^
+
+Stream type to stop, see param[0] of API 0x81
+
+Param[2]
+^^^^^^^^
+
+Subtype, see param[1] of API 0x81
+
+
+
+CX2341X_ENC_SET_AUDIO_ID
+~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 137/0x89
+
+Description
+^^^^^^^^^^^
+
+Assigns the transport stream ID of the encoded audio stream
+
+Param[0]
+^^^^^^^^
+
+Audio Stream ID
+
+
+
+CX2341X_ENC_SET_VIDEO_ID
+~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 139/0x8B
+
+Description
+^^^^^^^^^^^
+
+Set video transport stream ID
+
+Param[0]
+^^^^^^^^
+
+Video stream ID
+
+
+
+CX2341X_ENC_SET_PCR_ID
+~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 141/0x8D
+
+Description
+^^^^^^^^^^^
+
+Assigns the transport stream ID for PCR packets
+
+Param[0]
+^^^^^^^^
+
+PCR Stream ID
+
+
+
+CX2341X_ENC_SET_FRAME_RATE
+~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 143/0x8F
+
+Description
+^^^^^^^^^^^
+
+Set video frames per second. Change occurs at start of new GOP.
+
+Param[0]
+^^^^^^^^
+
+- 0=30fps
+- 1=25fps
+
+
+
+CX2341X_ENC_SET_FRAME_SIZE
+~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 145/0x91
+
+Description
+^^^^^^^^^^^
+
+Select video stream encoding resolution.
+
+Param[0]
+^^^^^^^^
+
+Height in lines. Default 480
+
+Param[1]
+^^^^^^^^
+
+Width in pixels. Default 720
+
+
+
+CX2341X_ENC_SET_BIT_RATE
+~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 149/0x95
+
+Description
+^^^^^^^^^^^
+
+Assign average video stream bitrate.
+
+Param[0]
+^^^^^^^^
+
+0=variable bitrate, 1=constant bitrate
+
+Param[1]
+^^^^^^^^
+
+bitrate in bits per second
+
+Param[2]
+^^^^^^^^
+
+peak bitrate in bits per second, divided by 400
+
+Param[3]
+^^^^^^^^
+
+Mux bitrate in bits per second, divided by 400. May be 0 (default).
+
+Param[4]
+^^^^^^^^
+
+Rate Control VBR Padding
+
+Param[5]
+^^^^^^^^
+
+VBV Buffer used by encoder
+
+.. note::
+
+	#) Param\[3\] and Param\[4\] seem to be always 0
+	#) Param\[5\] doesn't seem to be used.
+
+
+
+CX2341X_ENC_SET_GOP_PROPERTIES
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 151/0x97
+
+Description
+^^^^^^^^^^^
+
+Setup the GOP structure
+
+Param[0]
+^^^^^^^^
+
+GOP size (maximum is 34)
+
+Param[1]
+^^^^^^^^
+
+Number of B frames between the I and P frame, plus 1.
+For example: IBBPBBPBBPBB --> GOP size: 12, number of B frames: 2+1 = 3
+
+.. note::
+
+	GOP size must be a multiple of (B-frames + 1).
+
+
+
+CX2341X_ENC_SET_ASPECT_RATIO
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 153/0x99
+
+Description
+^^^^^^^^^^^
+
+Sets the encoding aspect ratio. Changes in the aspect ratio take effect
+at the start of the next GOP.
+
+Param[0]
+^^^^^^^^
+
+- '0000' forbidden
+- '0001' 1:1 square
+- '0010' 4:3
+- '0011' 16:9
+- '0100' 2.21:1
+- '0101' to '1111' reserved
+
+
+
+CX2341X_ENC_SET_DNR_FILTER_MODE
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 155/0x9B
+
+Description
+^^^^^^^^^^^
+
+Assign Dynamic Noise Reduction operating mode
+
+Param[0]
+^^^^^^^^
+
+Bit0: Spatial filter, set=auto, clear=manual
+Bit1: Temporal filter, set=auto, clear=manual
+
+Param[1]
+^^^^^^^^
+
+Median filter:
+
+- 0=Disabled
+- 1=Horizontal
+- 2=Vertical
+- 3=Horiz/Vert
+- 4=Diagonal
+
+
+
+CX2341X_ENC_SET_DNR_FILTER_PROPS
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 157/0x9D
+
+Description
+^^^^^^^^^^^
+
+These Dynamic Noise Reduction filter values are only meaningful when
+the respective filter is set to "manual" (See API 0x9B)
+
+Param[0]
+^^^^^^^^
+
+Spatial filter: default 0, range 0:15
+
+Param[1]
+^^^^^^^^
+
+Temporal filter: default 0, range 0:31
+
+
+
+CX2341X_ENC_SET_CORING_LEVELS
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 159/0x9F
+
+Description
+^^^^^^^^^^^
+
+Assign Dynamic Noise Reduction median filter properties.
+
+Param[0]
+^^^^^^^^
+
+Threshold above which the luminance median filter is enabled.
+Default: 0, range 0:255
+
+Param[1]
+^^^^^^^^
+
+Threshold below which the luminance median filter is enabled.
+Default: 255, range 0:255
+
+Param[2]
+^^^^^^^^
+
+Threshold above which the chrominance median filter is enabled.
+Default: 0, range 0:255
+
+Param[3]
+^^^^^^^^
+
+Threshold below which the chrominance median filter is enabled.
+Default: 255, range 0:255
+
+
+
+CX2341X_ENC_SET_SPATIAL_FILTER_TYPE
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 161/0xA1
+
+Description
+^^^^^^^^^^^
+
+Assign spatial prefilter parameters
+
+Param[0]
+^^^^^^^^
+
+Luminance filter
+
+- 0=Off
+- 1=1D Horizontal
+- 2=1D Vertical
+- 3=2D H/V Separable (default)
+- 4=2D Symmetric non-separable
+
+Param[1]
+^^^^^^^^
+
+Chrominance filter
+
+- 0=Off
+- 1=1D Horizontal (default)
+
+
+
+CX2341X_ENC_SET_VBI_LINE
+~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 183/0xB7
+
+Description
+^^^^^^^^^^^
+
+Selects VBI line number.
+
+Param[0]
+^^^^^^^^
+
+- Bits 0:4 	line number
+- Bit  31		0=top_field, 1=bottom_field
+- Bits 0:31 	all set specifies "all lines"
+
+Param[1]
+^^^^^^^^
+
+VBI line information features: 0=disabled, 1=enabled
+
+Param[2]
+^^^^^^^^
+
+Slicing: 0=None, 1=Closed Caption
+Almost certainly not implemented. Set to 0.
+
+Param[3]
+^^^^^^^^
+
+Luminance samples in this line.
+Almost certainly not implemented. Set to 0.
+
+Param[4]
+^^^^^^^^
+
+Chrominance samples in this line
+Almost certainly not implemented. Set to 0.
+
+
+
+CX2341X_ENC_SET_STREAM_TYPE
+~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 185/0xB9
+
+Description
+^^^^^^^^^^^
+
+Assign stream type
+
+.. note::
+
+	Transport stream is not working in recent firmwares.
+	And in older firmwares the timestamps in the TS seem to be
+	unreliable.
+
+Param[0]
+^^^^^^^^
+
+- 0=Program stream
+- 1=Transport stream
+- 2=MPEG1 stream
+- 3=PES A/V stream
+- 5=PES Video stream
+- 7=PES Audio stream
+- 10=DVD stream
+- 11=VCD stream
+- 12=SVCD stream
+- 13=DVD_S1 stream
+- 14=DVD_S2 stream
+
+
+
+CX2341X_ENC_SET_OUTPUT_PORT
+~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 187/0xBB
+
+Description
+^^^^^^^^^^^
+
+Assign stream output port. Normally 0 when the data is copied through
+the PCI bus (DMA), and 1 when the data is streamed to another chip
+(pvrusb and cx88-blackbird).
+
+Param[0]
+^^^^^^^^
+
+- 0=Memory (default)
+- 1=Streaming
+- 2=Serial
+
+Param[1]
+^^^^^^^^
+
+Unknown, but leaving this to 0 seems to work best. Indications are that
+this might have to do with USB support, although passing anything but 0
+only breaks things.
+
+
+
+CX2341X_ENC_SET_AUDIO_PROPERTIES
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 189/0xBD
+
+Description
+^^^^^^^^^^^
+
+Set audio stream properties, may be called while encoding is in progress.
+
+.. note::
+
+	All bitfields are consistent with ISO11172 documentation except
+	bits 2:3 which ISO docs define as:
+
+	- '11' Layer I
+	- '10' Layer II
+	- '01' Layer III
+	- '00' Undefined
+
+	This discrepancy may indicate a possible error in the documentation.
+	Testing indicated that only Layer II is actually working, and that
+	the minimum bitrate should be 192 kbps.
+
+Param[0]
+^^^^^^^^
+
+Bitmask:
+
+.. code-block:: none
+
+	   0:1  '00' 44.1Khz
+		'01' 48Khz
+		'10' 32Khz
+		'11' reserved
+
+	   2:3  '01'=Layer I
+		'10'=Layer II
+
+	   4:7  Bitrate:
+		     Index | Layer I     | Layer II
+		     ------+-------------+------------
+		    '0000' | free format | free format
+		    '0001' |  32 kbit/s  |  32 kbit/s
+		    '0010' |  64 kbit/s  |  48 kbit/s
+		    '0011' |  96 kbit/s  |  56 kbit/s
+		    '0100' | 128 kbit/s  |  64 kbit/s
+		    '0101' | 160 kbit/s  |  80 kbit/s
+		    '0110' | 192 kbit/s  |  96 kbit/s
+		    '0111' | 224 kbit/s  | 112 kbit/s
+		    '1000' | 256 kbit/s  | 128 kbit/s
+		    '1001' | 288 kbit/s  | 160 kbit/s
+		    '1010' | 320 kbit/s  | 192 kbit/s
+		    '1011' | 352 kbit/s  | 224 kbit/s
+		    '1100' | 384 kbit/s  | 256 kbit/s
+		    '1101' | 416 kbit/s  | 320 kbit/s
+		    '1110' | 448 kbit/s  | 384 kbit/s
+
+		.. note::
+
+			For Layer II, not all combinations of total bitrate
+			and mode are allowed. See ISO11172-3 3-Annex B,
+			Table 3-B.2
+
+	   8:9  '00'=Stereo
+		'01'=JointStereo
+		'10'=Dual
+		'11'=Mono
+
+		.. note::
+
+			The cx23415 cannot decode Joint Stereo properly.
+
+	  10:11 Mode Extension used in joint_stereo mode.
+		In Layer I and II they indicate which subbands are in
+		intensity_stereo. All other subbands are coded in stereo.
+		    '00' subbands 4-31 in intensity_stereo, bound==4
+		    '01' subbands 8-31 in intensity_stereo, bound==8
+		    '10' subbands 12-31 in intensity_stereo, bound==12
+		    '11' subbands 16-31 in intensity_stereo, bound==16
+
+	  12:13 Emphasis:
+		    '00' None
+		    '01' 50/15uS
+		    '10' reserved
+		    '11' CCITT J.17
+
+	  14 	CRC:
+		    '0' off
+		    '1' on
+
+	  15    Copyright:
+		    '0' off
+		    '1' on
+
+	  16    Generation:
+		    '0' copy
+		    '1' original
+
+
+
+CX2341X_ENC_HALT_FW
+~~~~~~~~~~~~~~~~~~~
+
+Enum: 195/0xC3
+
+Description
+^^^^^^^^^^^
+
+The firmware is halted and no further API calls are serviced until the
+firmware is uploaded again.
+
+
+
+CX2341X_ENC_GET_VERSION
+~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 196/0xC4
+
+Description
+^^^^^^^^^^^
+
+Returns the version of the encoder firmware.
+
+Result[0]
+^^^^^^^^^
+
+Version bitmask:
+- Bits  0:15 build
+- Bits 16:23 minor
+- Bits 24:31 major
+
+
+
+CX2341X_ENC_SET_GOP_CLOSURE
+~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 197/0xC5
+
+Description
+^^^^^^^^^^^
+
+Assigns the GOP open/close property.
+
+Param[0]
+^^^^^^^^
+
+- 0=Open
+- 1=Closed
+
+
+
+CX2341X_ENC_GET_SEQ_END
+~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 198/0xC6
+
+Description
+^^^^^^^^^^^
+
+Obtains the sequence end code of the encoder's buffer. When a capture
+is started a number of interrupts are still generated, the last of
+which will have Result[0] set to 1 and Result[1] will contain the size
+of the buffer.
+
+Result[0]
+^^^^^^^^^
+
+State of the transfer (1 if last buffer)
+
+Result[1]
+^^^^^^^^^
+
+If Result[0] is 1, this contains the size of the last buffer, undefined
+otherwise.
+
+
+
+CX2341X_ENC_SET_PGM_INDEX_INFO
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 199/0xC7
+
+Description
+^^^^^^^^^^^
+
+Sets the Program Index Information.
+The information is stored as follows:
+
+.. code-block:: c
+
+	struct info {
+		u32 length;		// Length of this frame
+		u32 offset_low;		// Offset in the file of the
+		u32 offset_high;	// start of this frame
+		u32 mask1;		// Bits 0-2 are the type mask:
+					// 1=I, 2=P, 4=B
+					// 0=End of Program Index, other fields
+					//   are invalid.
+		u32 pts;		// The PTS of the frame
+		u32 mask2;		// Bit 0 is bit 32 of the pts.
+	};
+	u32 table_ptr;
+	struct info index[400];
+
+The table_ptr is the encoder memory address in the table were
+*new* entries will be written.
+
+.. note:: This is a ringbuffer, so the table_ptr will wraparound.
+
+Param[0]
+^^^^^^^^
+
+Picture Mask:
+- 0=No index capture
+- 1=I frames
+- 3=I,P frames
+- 7=I,P,B frames
+
+(Seems to be ignored, it always indexes I, P and B frames)
+
+Param[1]
+^^^^^^^^
+
+Elements requested (up to 400)
+
+Result[0]
+^^^^^^^^^
+
+Offset in the encoder memory of the start of the table.
+
+Result[1]
+^^^^^^^^^
+
+Number of allocated elements up to a maximum of Param[1]
+
+
+
+CX2341X_ENC_SET_VBI_CONFIG
+~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 200/0xC8
+
+Description
+^^^^^^^^^^^
+
+Configure VBI settings
+
+Param[0]
+^^^^^^^^
+
+Bitmap:
+
+.. code-block:: none
+
+	    0    Mode '0' Sliced, '1' Raw
+	    1:3  Insertion:
+		     '000' insert in extension & user data
+		     '001' insert in private packets
+		     '010' separate stream and user data
+		     '111' separate stream and private data
+	    8:15 Stream ID (normally 0xBD)
+
+Param[1]
+^^^^^^^^
+
+Frames per interrupt (max 8). Only valid in raw mode.
+
+Param[2]
+^^^^^^^^
+
+Total raw VBI frames. Only valid in raw mode.
+
+Param[3]
+^^^^^^^^
+
+Start codes
+
+Param[4]
+^^^^^^^^
+
+Stop codes
+
+Param[5]
+^^^^^^^^
+
+Lines per frame
+
+Param[6]
+^^^^^^^^
+
+Byte per line
+
+Result[0]
+^^^^^^^^^
+
+Observed frames per interrupt in raw mode only. Rage 1 to Param[1]
+
+Result[1]
+^^^^^^^^^
+
+Observed number of frames in raw mode. Range 1 to Param[2]
+
+Result[2]
+^^^^^^^^^
+
+Memory offset to start or raw VBI data
+
+
+
+CX2341X_ENC_SET_DMA_BLOCK_SIZE
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 201/0xC9
+
+Description
+^^^^^^^^^^^
+
+Set DMA transfer block size
+
+Param[0]
+^^^^^^^^
+
+DMA transfer block size in bytes or frames. When unit is bytes,
+supported block sizes are 2^7, 2^8 and 2^9 bytes.
+
+Param[1]
+^^^^^^^^
+
+Unit: 0=bytes, 1=frames
+
+
+
+CX2341X_ENC_GET_PREV_DMA_INFO_MB_10
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 202/0xCA
+
+Description
+^^^^^^^^^^^
+
+Returns information on the previous DMA transfer in conjunction with
+bit 27 of the interrupt mask. Uses mailbox 10.
+
+Result[0]
+^^^^^^^^^
+
+Type of stream
+
+Result[1]
+^^^^^^^^^
+
+Address Offset
+
+Result[2]
+^^^^^^^^^
+
+Maximum size of transfer
+
+
+
+CX2341X_ENC_GET_PREV_DMA_INFO_MB_9
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 203/0xCB
+
+Description
+^^^^^^^^^^^
+
+Returns information on the previous DMA transfer in conjunction with
+bit 27 or 18 of the interrupt mask. Uses mailbox 9.
+
+Result[0]
+^^^^^^^^^
+
+Status bits:
+- 0   read completed
+- 1   write completed
+- 2   DMA read error
+- 3   DMA write error
+- 4   Scatter-Gather array error
+
+Result[1]
+^^^^^^^^^
+
+DMA type
+
+Result[2]
+^^^^^^^^^
+
+Presentation Time Stamp bits 0..31
+
+Result[3]
+^^^^^^^^^
+
+Presentation Time Stamp bit 32
+
+
+
+CX2341X_ENC_SCHED_DMA_TO_HOST
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 204/0xCC
+
+Description
+^^^^^^^^^^^
+
+Setup DMA to host operation
+
+Param[0]
+^^^^^^^^
+
+Memory address of link list
+
+Param[1]
+^^^^^^^^
+
+Length of link list (wtf: what units ???)
+
+Param[2]
+^^^^^^^^
+
+DMA type (0=MPEG)
+
+
+
+CX2341X_ENC_INITIALIZE_INPUT
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 205/0xCD
+
+Description
+^^^^^^^^^^^
+
+Initializes the video input
+
+
+
+CX2341X_ENC_SET_FRAME_DROP_RATE
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 208/0xD0
+
+Description
+^^^^^^^^^^^
+
+For each frame captured, skip specified number of frames.
+
+Param[0]
+^^^^^^^^
+
+Number of frames to skip
+
+
+
+CX2341X_ENC_PAUSE_ENCODER
+~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 210/0xD2
+
+Description
+^^^^^^^^^^^
+
+During a pause condition, all frames are dropped instead of being encoded.
+
+Param[0]
+^^^^^^^^
+
+- 0=Pause encoding
+- 1=Continue encoding
+
+
+
+CX2341X_ENC_REFRESH_INPUT
+~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 211/0xD3
+
+Description
+^^^^^^^^^^^
+
+Refreshes the video input
+
+
+
+CX2341X_ENC_SET_COPYRIGHT
+~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 212/0xD4
+
+Description
+^^^^^^^^^^^
+
+Sets stream copyright property
+
+Param[0]
+^^^^^^^^
+
+
+- 0=Stream is not copyrighted
+- 1=Stream is copyrighted
+
+
+
+CX2341X_ENC_SET_EVENT_NOTIFICATION
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 213/0xD5
+
+Description
+^^^^^^^^^^^
+
+Setup firmware to notify the host about a particular event. Host must
+unmask the interrupt bit.
+
+Param[0]
+^^^^^^^^
+
+Event (0=refresh encoder input)
+
+Param[1]
+^^^^^^^^
+
+Notification 0=disabled 1=enabled
+
+Param[2]
+^^^^^^^^
+
+Interrupt bit
+
+Param[3]
+^^^^^^^^
+
+Mailbox slot, -1 if no mailbox required.
+
+
+
+CX2341X_ENC_SET_NUM_VSYNC_LINES
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 214/0xD6
+
+Description
+^^^^^^^^^^^
+
+Depending on the analog video decoder used, this assigns the number
+of lines for field 1 and 2.
+
+Param[0]
+^^^^^^^^
+
+Field 1 number of lines:
+- 0x00EF for SAA7114
+- 0x00F0 for SAA7115
+- 0x0105 for Micronas
+
+Param[1]
+^^^^^^^^
+
+Field 2 number of lines:
+- 0x00EF for SAA7114
+- 0x00F0 for SAA7115
+- 0x0106 for Micronas
+
+
+
+CX2341X_ENC_SET_PLACEHOLDER
+~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 215/0xD7
+
+Description
+^^^^^^^^^^^
+
+Provides a mechanism of inserting custom user data in the MPEG stream.
+
+Param[0]
+^^^^^^^^
+
+- 0=extension & user data
+- 1=private packet with stream ID 0xBD
+
+Param[1]
+^^^^^^^^
+
+Rate at which to insert data, in units of frames (for private packet)
+or GOPs (for ext. & user data)
+
+Param[2]
+^^^^^^^^
+
+Number of data DWORDs (below) to insert
+
+Param[3]
+^^^^^^^^
+
+Custom data 0
+
+Param[4]
+^^^^^^^^
+
+Custom data 1
+
+Param[5]
+^^^^^^^^
+
+Custom data 2
+
+Param[6]
+^^^^^^^^
+
+Custom data 3
+
+Param[7]
+^^^^^^^^
+
+Custom data 4
+
+Param[8]
+^^^^^^^^
+
+Custom data 5
+
+Param[9]
+^^^^^^^^
+
+Custom data 6
+
+Param[10]
+^^^^^^^^^
+
+Custom data 7
+
+Param[11]
+^^^^^^^^^
+
+Custom data 8
+
+
+
+CX2341X_ENC_MUTE_VIDEO
+~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 217/0xD9
+
+Description
+^^^^^^^^^^^
+
+Video muting
+
+Param[0]
+^^^^^^^^
+
+Bit usage:
+
+.. code-block:: none
+
+	 0    	'0'=video not muted
+		'1'=video muted, creates frames with the YUV color defined below
+	 1:7  	Unused
+	 8:15 	V chrominance information
+	16:23 	U chrominance information
+	24:31 	Y luminance information
+
+
+
+CX2341X_ENC_MUTE_AUDIO
+~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 218/0xDA
+
+Description
+^^^^^^^^^^^
+
+Audio muting
+
+Param[0]
+^^^^^^^^
+
+- 0=audio not muted
+- 1=audio muted (produces silent mpeg audio stream)
+
+
+
+CX2341X_ENC_SET_VERT_CROP_LINE
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 219/0xDB
+
+Description
+^^^^^^^^^^^
+
+Something to do with 'Vertical Crop Line'
+
+Param[0]
+^^^^^^^^
+
+If saa7114 and raw VBI capture and 60 Hz, then set to 10001.
+Else 0.
+
+
+
+CX2341X_ENC_MISC
+~~~~~~~~~~~~~~~~
+
+Enum: 220/0xDC
+
+Description
+^^^^^^^^^^^
+
+Miscellaneous actions. Not known for 100% what it does. It's really a
+sort of ioctl call. The first parameter is a command number, the second
+the value.
+
+Param[0]
+^^^^^^^^
+
+Command number:
+
+.. code-block:: none
+
+	 1=set initial SCR value when starting encoding (works).
+	 2=set quality mode (apparently some test setting).
+	 3=setup advanced VIM protection handling.
+	   Always 1 for the cx23416 and 0 for cx23415.
+	 4=generate DVD compatible PTS timestamps
+	 5=USB flush mode
+	 6=something to do with the quantization matrix
+	 7=set navigation pack insertion for DVD: adds 0xbf (private stream 2)
+	   packets to the MPEG. The size of these packets is 2048 bytes (including
+	   the header of 6 bytes: 0x000001bf + length). The payload is zeroed and
+	   it is up to the application to fill them in. These packets are apparently
+	   inserted every four frames.
+	 8=enable scene change detection (seems to be a failure)
+	 9=set history parameters of the video input module
+	10=set input field order of VIM
+	11=set quantization matrix
+	12=reset audio interface after channel change or input switch (has no argument).
+	   Needed for the cx2584x, not needed for the mspx4xx, but it doesn't seem to
+	   do any harm calling it regardless.
+	13=set audio volume delay
+	14=set audio delay
+
+
+Param[1]
+^^^^^^^^
+
+Command value.
+
+Decoder firmware API description
+--------------------------------
+
+.. note:: this API is part of the decoder firmware, so it's cx23415 only.
+
+
+
+CX2341X_DEC_PING_FW
+~~~~~~~~~~~~~~~~~~~
+
+Enum: 0/0x00
+
+Description
+^^^^^^^^^^^
+
+This API call does nothing. It may be used to check if the firmware
+is responding.
+
+
+
+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)
+
+
+
+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
+
+
+
+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]
+^^^^^^^^
+
+.. code-block:: none
+
+	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]
+^^^^^^^^
+
+.. code-block:: none
+
+	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)
+
+
+
+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
+
+
+
+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.
+
+
+
+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
+
+
+
+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
+
+
+
+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)
+
+
+
+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
+
+
+
+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.
+
+
+
+CX2341X_DEC_SET_STANDARD
+~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 16/0x10
+
+Description
+^^^^^^^^^^^
+
+Selects display standard
+
+Param[0]
+^^^^^^^^
+
+0=NTSC, 1=PAL
+
+
+
+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
+
+
+
+CX2341X_DEC_SET_STREAM_INPUT
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enum: 20/0x14
+
+Description
+^^^^^^^^^^^
+
+Select decoder stream input port
+
+Param[0]
+^^^^^^^^
+
+0=memory (default), 1=streaming
+
+
+
+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
+
+
+
+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
+
+
+
+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.
+	- 3=Decoder started
+	- 4=Unknown: goes off 10-15 times per second while decoding.
+	- 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.
+
+
+
+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
+
+
+
+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
+
+
+
+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
+
+
+
+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
+
+PVR350 Video decoder registers 0x02002800 -> 0x02002B00
+-------------------------------------------------------
+
+Author: Ian Armstrong <ian@iarmst.demon.co.uk>
+
+Version: v0.4
+
+Date: 12 March 2007
+
+
+This list has been worked out through trial and error. There will be mistakes
+and omissions. Some registers have no obvious effect so it's hard to say what
+they do, while others interact with each other, or require a certain load
+sequence. Horizontal filter setup is one example, with six registers working
+in unison and requiring a certain load sequence to correctly configure. The
+indexed colour palette is much easier to set at just two registers, but again
+it requires a certain load sequence.
+
+Some registers are fussy about what they are set to. Load in a bad value & the
+decoder will fail. A firmware reload will often recover, but sometimes a reset
+is required. For registers containing size information, setting them to 0 is
+generally a bad idea. For other control registers i.e. 2878, you'll only find
+out what values are bad when it hangs.
+
+.. code-block:: none
+
+	--------------------------------------------------------------------------------
+	2800
+	bit 0
+		Decoder enable
+		0 = disable
+		1 = enable
+	--------------------------------------------------------------------------------
+	2804
+	bits 0:31
+		Decoder horizontal Y alias register 1
+	---------------
+	2808
+	bits 0:31
+		Decoder horizontal Y alias register 2
+	---------------
+	280C
+	bits 0:31
+		Decoder horizontal Y alias register 3
+	---------------
+	2810
+	bits 0:31
+		Decoder horizontal Y alias register 4
+	---------------
+	2814
+	bits 0:31
+		Decoder horizontal Y alias register 5
+	---------------
+	2818
+	bits 0:31
+		Decoder horizontal Y alias trigger
+
+	These six registers control the horizontal aliasing filter for the Y plane.
+	The first five registers must all be loaded before accessing the trigger
+	(2818), as this register actually clocks the data through for the first
+	five.
+
+	To correctly program set the filter, this whole procedure must be done 16
+	times. The actual register contents are copied from a lookup-table in the
+	firmware which contains 4 different filter settings.
+
+	--------------------------------------------------------------------------------
+	281C
+	bits 0:31
+		Decoder horizontal UV alias register 1
+	---------------
+	2820
+	bits 0:31
+		Decoder horizontal UV alias register 2
+	---------------
+	2824
+	bits 0:31
+		Decoder horizontal UV alias register 3
+	---------------
+	2828
+	bits 0:31
+		Decoder horizontal UV alias register 4
+	---------------
+	282C
+	bits 0:31
+		Decoder horizontal UV alias register 5
+	---------------
+	2830
+	bits 0:31
+		Decoder horizontal UV alias trigger
+
+	These six registers control the horizontal aliasing for the UV plane.
+	Operation is the same as the Y filter, with 2830 being the trigger
+	register.
+
+	--------------------------------------------------------------------------------
+	2834
+	bits 0:15
+		Decoder Y source width in pixels
+
+	bits 16:31
+		Decoder Y destination width in pixels
+	---------------
+	2838
+	bits 0:15
+		Decoder UV source width in pixels
+
+	bits 16:31
+		Decoder UV destination width in pixels
+
+	NOTE: For both registers, the resulting image must be fully visible on
+	screen. If the image exceeds the right edge both the source and destination
+	size must be adjusted to reflect the visible portion. For the source width,
+	you must take into account the scaling when calculating the new value.
+	--------------------------------------------------------------------------------
+
+	283C
+	bits 0:31
+		Decoder Y horizontal scaling
+			Normally = Reg 2854 >> 2
+	---------------
+	2840
+	bits 0:31
+		Decoder ?? unknown - horizontal scaling
+		Usually 0x00080514
+	---------------
+	2844
+	bits 0:31
+		Decoder UV horizontal scaling
+		Normally = Reg 2854 >> 2
+	---------------
+	2848
+	bits 0:31
+		Decoder ?? unknown - horizontal scaling
+		Usually 0x00100514
+	---------------
+	284C
+	bits 0:31
+		Decoder ?? unknown - Y plane
+		Usually 0x00200020
+	---------------
+	2850
+	bits 0:31
+		Decoder ?? unknown - UV plane
+		Usually 0x00200020
+	---------------
+	2854
+	bits 0:31
+		Decoder 'master' value for horizontal scaling
+	---------------
+	2858
+	bits 0:31
+		Decoder ?? unknown
+		Usually 0
+	---------------
+	285C
+	bits 0:31
+		Decoder ?? unknown
+		Normally = Reg 2854 >> 1
+	---------------
+	2860
+	bits 0:31
+		Decoder ?? unknown
+		Usually 0
+	---------------
+	2864
+	bits 0:31
+		Decoder ?? unknown
+		Normally = Reg 2854 >> 1
+	---------------
+	2868
+	bits 0:31
+		Decoder ?? unknown
+		Usually 0
+
+	Most of these registers either control horizontal scaling, or appear linked
+	to it in some way. Register 2854 contains the 'master' value & the other
+	registers can be calculated from that one. You must also remember to
+	correctly set the divider in Reg 2874.
+
+	To enlarge:
+		Reg 2854 = (source_width * 0x00200000) / destination_width
+		Reg 2874 = No divide
+
+	To reduce from full size down to half size:
+		Reg 2854 = (source_width/2 * 0x00200000) / destination width
+		Reg 2874 = Divide by 2
+
+	To reduce from half size down to quarter size:
+		Reg 2854 = (source_width/4 * 0x00200000) / destination width
+		Reg 2874 = Divide by 4
+
+	The result is always rounded up.
+
+	--------------------------------------------------------------------------------
+	286C
+	bits 0:15
+		Decoder horizontal Y buffer offset
+
+	bits 15:31
+		Decoder horizontal UV buffer offset
+
+	Offset into the video image buffer. If the offset is gradually incremented,
+	the on screen image will move left & wrap around higher up on the right.
+
+	--------------------------------------------------------------------------------
+	2870
+	bits 0:15
+		Decoder horizontal Y output offset
+
+	bits 16:31
+		Decoder horizontal UV output offset
+
+	Offsets the actual video output. Controls output alignment of the Y & UV
+	planes. The higher the value, the greater the shift to the left. Use
+	reg 2890 to move the image right.
+
+	--------------------------------------------------------------------------------
+	2874
+	bits 0:1
+		Decoder horizontal Y output size divider
+		00 = No divide
+		01 = Divide by 2
+		10 = Divide by 3
+
+	bits 4:5
+		Decoder horizontal UV output size divider
+		00 = No divide
+		01 = Divide by 2
+		10 = Divide by 3
+
+	bit 8
+		Decoder ?? unknown
+		0 = Normal
+		1 = Affects video output levels
+
+	bit 16
+		Decoder ?? unknown
+		0 = Normal
+		1 = Disable horizontal filter
+
+	--------------------------------------------------------------------------------
+	2878
+	bit 0
+		?? unknown
+
+	bit 1
+		osd on/off
+		0 = osd off
+		1 = osd on
+
+	bit 2
+		Decoder + osd video timing
+		0 = NTSC
+		1 = PAL
+
+	bits 3:4
+		?? unknown
+
+	bit 5
+		Decoder + osd
+		Swaps upper & lower fields
+
+	--------------------------------------------------------------------------------
+	287C
+	bits 0:10
+		Decoder & osd ?? unknown
+		Moves entire screen horizontally. Starts at 0x005 with the screen
+		shifted heavily to the right. Incrementing in steps of 0x004 will
+		gradually shift the screen to the left.
+
+	bits 11:31
+		?? unknown
+
+	Normally contents are 0x00101111 (NTSC) or 0x1010111d (PAL)
+
+	--------------------------------------------------------------------------------
+	2880  --------    ?? unknown
+	2884  --------    ?? unknown
+	--------------------------------------------------------------------------------
+	2888
+	bit 0
+		Decoder + osd ?? unknown
+		0 = Normal
+		1 = Misaligned fields (Correctable through 289C & 28A4)
+
+	bit 4
+		?? unknown
+
+	bit 8
+		?? unknown
+
+	Warning: Bad values will require a firmware reload to recover.
+			Known to be bad are 0x000,0x011,0x100,0x111
+	--------------------------------------------------------------------------------
+	288C
+	bits 0:15
+		osd ?? unknown
+		Appears to affect the osd position stability. The higher the value the
+		more unstable it becomes. Decoder output remains stable.
+
+	bits 16:31
+		osd ?? unknown
+		Same as bits 0:15
+
+	--------------------------------------------------------------------------------
+	2890
+	bits 0:11
+		Decoder output horizontal offset.
+
+	Horizontal offset moves the video image right. A small left shift is
+	possible, but it's better to use reg 2870 for that due to its greater
+	range.
+
+	NOTE: Video corruption will occur if video window is shifted off the right
+	edge. To avoid this read the notes for 2834 & 2838.
+	--------------------------------------------------------------------------------
+	2894
+	bits 0:23
+		Decoder output video surround colour.
+
+	Contains the colour (in yuv) used to fill the screen when the video is
+	running in a window.
+	--------------------------------------------------------------------------------
+	2898
+	bits 0:23
+		Decoder video window colour
+		Contains the colour (in yuv) used to fill the video window when the
+		video is turned off.
+
+	bit 24
+		Decoder video output
+		0 = Video on
+		1 = Video off
+
+	bit 28
+		Decoder plane order
+		0 = Y,UV
+		1 = UV,Y
+
+	bit 29
+		Decoder second plane byte order
+		0 = Normal (UV)
+		1 = Swapped (VU)
+
+	In normal usage, the first plane is Y & the second plane is UV. Though the
+	order of the planes can be swapped, only the byte order of the second plane
+	can be swapped. This isn't much use for the Y plane, but can be useful for
+	the UV plane.
+
+	--------------------------------------------------------------------------------
+	289C
+	bits 0:15
+		Decoder vertical field offset 1
+
+	bits 16:31
+		Decoder vertical field offset 2
+
+	Controls field output vertical alignment. The higher the number, the lower
+	the image on screen. Known starting values are 0x011E0017 (NTSC) &
+	0x01500017 (PAL)
+	--------------------------------------------------------------------------------
+	28A0
+	bits 0:15
+		Decoder & osd width in pixels
+
+	bits 16:31
+		Decoder & osd height in pixels
+
+	All output from the decoder & osd are disabled beyond this area. Decoder
+	output will simply go black outside of this region. If the osd tries to
+	exceed this area it will become corrupt.
+	--------------------------------------------------------------------------------
+	28A4
+	bits 0:11
+		osd left shift.
+
+	Has a range of 0x770->0x7FF. With the exception of 0, any value outside of
+	this range corrupts the osd.
+	--------------------------------------------------------------------------------
+	28A8
+	bits 0:15
+		osd vertical field offset 1
+
+	bits 16:31
+		osd vertical field offset 2
+
+	Controls field output vertical alignment. The higher the number, the lower
+	the image on screen. Known starting values are 0x011E0017 (NTSC) &
+	0x01500017 (PAL)
+	--------------------------------------------------------------------------------
+	28AC  --------    ?? unknown
+	|
+	V
+	28BC  --------    ?? unknown
+	--------------------------------------------------------------------------------
+	28C0
+	bit 0
+		Current output field
+		0 = first field
+		1 = second field
+
+	bits 16:31
+		Current scanline
+		The scanline counts from the top line of the first field
+		through to the last line of the second field.
+	--------------------------------------------------------------------------------
+	28C4  --------    ?? unknown
+	|
+	V
+	28F8  --------    ?? unknown
+	--------------------------------------------------------------------------------
+	28FC
+	bit 0
+		?? unknown
+		0 = Normal
+		1 = Breaks decoder & osd output
+	--------------------------------------------------------------------------------
+	2900
+	bits 0:31
+		Decoder vertical Y alias register 1
+	---------------
+	2904
+	bits 0:31
+		Decoder vertical Y alias register 2
+	---------------
+	2908
+	bits 0:31
+		Decoder vertical Y alias trigger
+
+	These three registers control the vertical aliasing filter for the Y plane.
+	Operation is similar to the horizontal Y filter (2804). The only real
+	difference is that there are only two registers to set before accessing
+	the trigger register (2908). As for the horizontal filter, the values are
+	taken from a lookup table in the firmware, and the procedure must be
+	repeated 16 times to fully program the filter.
+	--------------------------------------------------------------------------------
+	290C
+	bits 0:31
+		Decoder vertical UV alias register 1
+	---------------
+	2910
+	bits 0:31
+		Decoder vertical UV alias register 2
+	---------------
+	2914
+	bits 0:31
+		Decoder vertical UV alias trigger
+
+	These three registers control the vertical aliasing filter for the UV
+	plane. Operation is the same as the Y filter, with 2914 being the trigger.
+	--------------------------------------------------------------------------------
+	2918
+	bits 0:15
+		Decoder Y source height in pixels
+
+	bits 16:31
+		Decoder Y destination height in pixels
+	---------------
+	291C
+	bits 0:15
+		Decoder UV source height in pixels divided by 2
+
+	bits 16:31
+		Decoder UV destination height in pixels
+
+	NOTE: For both registers, the resulting image must be fully visible on
+	screen. If the image exceeds the bottom edge both the source and
+	destination size must be adjusted to reflect the visible portion. For the
+	source height, you must take into account the scaling when calculating the
+	new value.
+	--------------------------------------------------------------------------------
+	2920
+	bits 0:31
+		Decoder Y vertical scaling
+		Normally = Reg 2930 >> 2
+	---------------
+	2924
+	bits 0:31
+		Decoder Y vertical scaling
+		Normally = Reg 2920 + 0x514
+	---------------
+	2928
+	bits 0:31
+		Decoder UV vertical scaling
+		When enlarging = Reg 2930 >> 2
+		When reducing = Reg 2930 >> 3
+	---------------
+	292C
+	bits 0:31
+		Decoder UV vertical scaling
+		Normally = Reg 2928 + 0x514
+	---------------
+	2930
+	bits 0:31
+		Decoder 'master' value for vertical scaling
+	---------------
+	2934
+	bits 0:31
+		Decoder ?? unknown - Y vertical scaling
+	---------------
+	2938
+	bits 0:31
+		Decoder Y vertical scaling
+		Normally = Reg 2930
+	---------------
+	293C
+	bits 0:31
+		Decoder ?? unknown - Y vertical scaling
+	---------------
+	2940
+	bits 0:31
+		Decoder UV vertical scaling
+		When enlarging = Reg 2930 >> 1
+		When reducing = Reg 2930
+	---------------
+	2944
+	bits 0:31
+		Decoder ?? unknown - UV vertical scaling
+	---------------
+	2948
+	bits 0:31
+		Decoder UV vertical scaling
+		Normally = Reg 2940
+	---------------
+	294C
+	bits 0:31
+		Decoder ?? unknown - UV vertical scaling
+
+	Most of these registers either control vertical scaling, or appear linked
+	to it in some way. Register 2930 contains the 'master' value & all other
+	registers can be calculated from that one. You must also remember to
+	correctly set the divider in Reg 296C
+
+	To enlarge:
+		Reg 2930 = (source_height * 0x00200000) / destination_height
+		Reg 296C = No divide
+
+	To reduce from full size down to half size:
+		Reg 2930 = (source_height/2 * 0x00200000) / destination height
+		Reg 296C = Divide by 2
+
+	To reduce from half down to quarter.
+		Reg 2930 = (source_height/4 * 0x00200000) / destination height
+		Reg 296C = Divide by 4
+
+	--------------------------------------------------------------------------------
+	2950
+	bits 0:15
+		Decoder Y line index into display buffer, first field
+
+	bits 16:31
+		Decoder Y vertical line skip, first field
+	--------------------------------------------------------------------------------
+	2954
+	bits 0:15
+		Decoder Y line index into display buffer, second field
+
+	bits 16:31
+		Decoder Y vertical line skip, second field
+	--------------------------------------------------------------------------------
+	2958
+	bits 0:15
+		Decoder UV line index into display buffer, first field
+
+	bits 16:31
+		Decoder UV vertical line skip, first field
+	--------------------------------------------------------------------------------
+	295C
+	bits 0:15
+		Decoder UV line index into display buffer, second field
+
+	bits 16:31
+		Decoder UV vertical line skip, second field
+	--------------------------------------------------------------------------------
+	2960
+	bits 0:15
+		Decoder destination height minus 1
+
+	bits 16:31
+		Decoder destination height divided by 2
+	--------------------------------------------------------------------------------
+	2964
+	bits 0:15
+		Decoder Y vertical offset, second field
+
+	bits 16:31
+		Decoder Y vertical offset, first field
+
+	These two registers shift the Y plane up. The higher the number, the
+	greater the shift.
+	--------------------------------------------------------------------------------
+	2968
+	bits 0:15
+		Decoder UV vertical offset, second field
+
+	bits 16:31
+		Decoder UV vertical offset, first field
+
+	These two registers shift the UV plane up. The higher the number, the
+	greater the shift.
+	--------------------------------------------------------------------------------
+	296C
+	bits 0:1
+		Decoder vertical Y output size divider
+		00 = No divide
+		01 = Divide by 2
+		10 = Divide by 4
+
+	bits 8:9
+		Decoder vertical UV output size divider
+		00 = No divide
+		01 = Divide by 2
+		10 = Divide by 4
+	--------------------------------------------------------------------------------
+	2970
+	bit 0
+		Decoder ?? unknown
+		0 = Normal
+		1 = Affect video output levels
+
+	bit 16
+		Decoder ?? unknown
+		0 = Normal
+		1 = Disable vertical filter
+
+	--------------------------------------------------------------------------------
+	2974  --------   ?? unknown
+	|
+	V
+	29EF  --------   ?? unknown
+	--------------------------------------------------------------------------------
+	2A00
+	bits 0:2
+		osd colour mode
+		000 = 8 bit indexed
+		001 = 16 bit (565)
+		010 = 15 bit (555)
+		011 = 12 bit (444)
+		100 = 32 bit (8888)
+
+	bits 4:5
+		osd display bpp
+		01 = 8 bit
+		10 = 16 bit
+		11 = 32 bit
+
+	bit 8
+		osd global alpha
+		0 = Off
+		1 = On
+
+	bit 9
+		osd local alpha
+		0 = Off
+		1 = On
+
+	bit 10
+		osd colour key
+		0 = Off
+		1 = On
+
+	bit 11
+		osd ?? unknown
+		Must be 1
+
+	bit 13
+		osd colour space
+		0 = ARGB
+		1 = AYVU
+
+	bits 16:31
+		osd ?? unknown
+		Must be 0x001B (some kind of buffer pointer ?)
+
+	When the bits-per-pixel is set to 8, the colour mode is ignored and
+	assumed to be 8 bit indexed. For 16 & 32 bits-per-pixel the colour depth
+	is honoured, and when using a colour depth that requires fewer bytes than
+	allocated the extra bytes are used as padding. So for a 32 bpp with 8 bit
+	index colour, there are 3 padding bytes per pixel. It's also possible to
+	select 16bpp with a 32 bit colour mode. This results in the pixel width
+	being doubled, but the color key will not work as expected in this mode.
+
+	Colour key is as it suggests. You designate a colour which will become
+	completely transparent. When using 565, 555 or 444 colour modes, the
+	colour key is always 16 bits wide. The colour to key on is set in Reg 2A18.
+
+	Local alpha works differently depending on the colour mode. For 32bpp & 8
+	bit indexed, local alpha is a per-pixel 256 step transparency, with 0 being
+	transparent and 255 being solid. For the 16bpp modes 555 & 444, the unused
+	bit(s) act as a simple transparency switch, with 0 being solid & 1 being
+	fully transparent. There is no local alpha support for 16bit 565.
+
+	Global alpha is a 256 step transparency that applies to the entire osd,
+	with 0 being transparent & 255 being solid.
+
+	It's possible to combine colour key, local alpha & global alpha.
+	--------------------------------------------------------------------------------
+	2A04
+	bits 0:15
+		osd x coord for left edge
+
+	bits 16:31
+		osd y coord for top edge
+	---------------
+	2A08
+	bits 0:15
+		osd x coord for right edge
+
+	bits 16:31
+		osd y coord for bottom edge
+
+	For both registers, (0,0) = top left corner of the display area. These
+	registers do not control the osd size, only where it's positioned & how
+	much is visible. The visible osd area cannot exceed the right edge of the
+	display, otherwise the osd will become corrupt. See reg 2A10 for
+	setting osd width.
+	--------------------------------------------------------------------------------
+	2A0C
+	bits 0:31
+		osd buffer index
+
+	An index into the osd buffer. Slowly incrementing this moves the osd left,
+	wrapping around onto the right edge
+	--------------------------------------------------------------------------------
+	2A10
+	bits 0:11
+		osd buffer 32 bit word width
+
+	Contains the width of the osd measured in 32 bit words. This means that all
+	colour modes are restricted to a byte width which is divisible by 4.
+	--------------------------------------------------------------------------------
+	2A14
+	bits 0:15
+		osd height in pixels
+
+	bits 16:32
+		osd line index into buffer
+		osd will start displaying from this line.
+	--------------------------------------------------------------------------------
+	2A18
+	bits 0:31
+		osd colour key
+
+	Contains the colour value which will be transparent.
+	--------------------------------------------------------------------------------
+	2A1C
+	bits 0:7
+		osd global alpha
+
+	Contains the global alpha value (equiv ivtvfbctl --alpha XX)
+	--------------------------------------------------------------------------------
+	2A20  --------    ?? unknown
+	|
+	V
+	2A2C  --------    ?? unknown
+	--------------------------------------------------------------------------------
+	2A30
+	bits 0:7
+		osd colour to change in indexed palette
+	---------------
+	2A34
+	bits 0:31
+		osd colour for indexed palette
+
+	To set the new palette, first load the index of the colour to change into
+	2A30, then load the new colour into 2A34. The full palette is 256 colours,
+	so the index range is 0x00-0xFF
+	--------------------------------------------------------------------------------
+	2A38  --------    ?? unknown
+	2A3C  --------    ?? unknown
+	--------------------------------------------------------------------------------
+	2A40
+	bits 0:31
+		osd ?? unknown
+
+	Affects overall brightness, wrapping around to black
+	--------------------------------------------------------------------------------
+	2A44
+	bits 0:31
+		osd ?? unknown
+
+	Green tint
+	--------------------------------------------------------------------------------
+	2A48
+	bits 0:31
+		osd ?? unknown
+
+	Red tint
+	--------------------------------------------------------------------------------
+	2A4C
+	bits 0:31
+		osd ?? unknown
+
+	Affects overall brightness, wrapping around to black
+	--------------------------------------------------------------------------------
+	2A50
+	bits 0:31
+		osd ?? unknown
+
+	Colour shift
+	--------------------------------------------------------------------------------
+	2A54
+	bits 0:31
+		osd ?? unknown
+
+	Colour shift
+	--------------------------------------------------------------------------------
+	2A58  --------    ?? unknown
+	|
+	V
+	2AFC  --------    ?? unknown
+	--------------------------------------------------------------------------------
+	2B00
+	bit 0
+		osd filter control
+		0 = filter off
+		1 = filter on
+
+	bits 1:4
+		osd ?? unknown
+
+	--------------------------------------------------------------------------------
+
+The cx231xx DMA engine
+----------------------
+
+
+This page describes the structures and procedures used by the cx2341x DMA
+engine.
+
+Introduction
+~~~~~~~~~~~~
+
+The cx2341x PCI interface is busmaster capable. This means it has a DMA
+engine to efficiently transfer large volumes of data between the card and main
+memory without requiring help from a CPU. Like most hardware, it must operate
+on contiguous physical memory. This is difficult to come by in large quantities
+on virtual memory machines.
+
+Therefore, it also supports a technique called "scatter-gather". The card can
+transfer multiple buffers in one operation. Instead of allocating one large
+contiguous buffer, the driver can allocate several smaller buffers.
+
+In practice, I've seen the average transfer to be roughly 80K, but transfers
+above 128K were not uncommon, particularly at startup. The 128K figure is
+important, because that is the largest block that the kernel can normally
+allocate. Even still, 128K blocks are hard to come by, so the driver writer is
+urged to choose a smaller block size and learn the scatter-gather technique.
+
+Mailbox #10 is reserved for DMA transfer information.
+
+Note: the hardware expects little-endian data ('intel format').
+
+Flow
+~~~~
+
+This section describes, in general, the order of events when handling DMA
+transfers. Detailed information follows this section.
+
+- The card raises the Encoder interrupt.
+- The driver reads the transfer type, offset and size from Mailbox #10.
+- The driver constructs the scatter-gather array from enough free dma buffers
+  to cover the size.
+- The driver schedules the DMA transfer via the ScheduleDMAtoHost API call.
+- The card raises the DMA Complete interrupt.
+- The driver checks the DMA status register for any errors.
+- The driver post-processes the newly transferred buffers.
+
+NOTE! It is possible that the Encoder and DMA Complete interrupts get raised
+simultaneously. (End of the last, start of the next, etc.)
+
+Mailbox #10
+~~~~~~~~~~~
+
+The Flags, Command, Return Value and Timeout fields are ignored.
+
+- Name:       Mailbox #10
+- Results[0]: Type: 0: MPEG.
+- Results[1]: Offset: The position relative to the card's memory space.
+- Results[2]: Size: The exact number of bytes to transfer.
+
+My speculation is that since the StartCapture API has a capture type of "RAW"
+available, that the type field will have other values that correspond to YUV
+and PCM data.
+
+Scatter-Gather Array
+~~~~~~~~~~~~~~~~~~~~
+
+The scatter-gather array is a contiguously allocated block of memory that
+tells the card the source and destination of each data-block to transfer.
+Card "addresses" are derived from the offset supplied by Mailbox #10. Host
+addresses are the physical memory location of the target DMA buffer.
+
+Each S-G array element is a struct of three 32-bit words. The first word is
+the source address, the second is the destination address. Both take up the
+entire 32 bits. The lowest 18 bits of the third word is the transfer byte
+count. The high-bit of the third word is the "last" flag. The last-flag tells
+the card to raise the DMA_DONE interrupt. From hard personal experience, if
+you forget to set this bit, the card will still "work" but the stream will
+most likely get corrupted.
+
+The transfer count must be a multiple of 256. Therefore, the driver will need
+to track how much data in the target buffer is valid and deal with it
+accordingly.
+
+Array Element:
+
+- 32-bit Source Address
+- 32-bit Destination Address
+- 14-bit reserved (high bit is the last flag)
+- 18-bit byte count
+
+DMA Transfer Status
+~~~~~~~~~~~~~~~~~~~
+
+Register 0x0004 holds the DMA Transfer Status:
+
+- bit 0:   read completed
+- bit 1:   write completed
+- bit 2:   DMA read error
+- bit 3:   DMA write error
+- bit 4:   Scatter-Gather array error