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-PVR350 Video decoder registers 0x02002800 -> 0x02002B00
-=======================================================
-
-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.
-
---------------------------------------------------------------------------------
-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
-
---------------------------------------------------------------------------------
-
-v0.4 - 12 March 2007 - Ian Armstrong (ian@iarmst.demon.co.uk)
-