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V4L/DVB (4985): Update cx2341x documentation.

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Removed a few unimplemented commands. Added a note for a few fields that are
not implemented in the firmware, and clarified several issues around reverse
playback.

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
This commit is contained in:
Hans Verkuil 2006-12-18 22:43:36 -03:00 • committed by Mauro Carvalho Chehab
parent e12ceaf496
commit 20a919f796
2 changed files with 7 additions and 43 deletions
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48
Documentation/video4linux/cx2341x/fw-decoder-api.txt
View file

@ -21,7 +21,7 @@ Param[0]
0 based frame number in GOP to begin playback from. 0 based frame number in GOP to begin playback from.
Param[1] Param[1]
Specifies the number of muted audio frames to play before normal Specifies the number of muted audio frames to play before normal
audio resumes. audio resumes. (This is not implemented in the firmware, leave at 0)
------------------------------------------------------------------------------- -------------------------------------------------------------------------------
@ -64,7 +64,7 @@ Param[0]
31 Speed: 31 Speed:
'0' slow '0' slow
'1' fast '1' fast
Note: n seems to be limited to 2. Anything higher does not result in Note: n is limited to 2. Anything higher does not result in
faster playback. Instead the host should start dropping frames. faster playback. Instead the host should start dropping frames.
Param[1] Param[1]
Direction: 0=forward, 1=reverse Direction: 0=forward, 1=reverse
@ -77,15 +77,16 @@ Param[2]
7=I, P, B frames 7=I, P, B frames
Param[3] Param[3]
B frames per GOP (for reverse play only) B frames per GOP (for reverse play only)
Note: apparently this does not work. For reverse play I can only make it Note: for reverse playback the Picture Mask should be set to I or I, P.
work by selecting I or I and P frames in the Picture mask. 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] Param[4]
Mute audio: 0=disable, 1=enable Mute audio: 0=disable, 1=enable
Param[5] Param[5]
Display 0=frame, 1=field Display 0=frame, 1=field
Param[6] Param[6]
Specifies the number of muted audio frames to play before normal audio Specifies the number of muted audio frames to play before normal audio
resumes. resumes. (Not implemented in the firmware, leave at 0)
------------------------------------------------------------------------------- -------------------------------------------------------------------------------
@ -287,43 +288,6 @@ Param[3]
------------------------------------------------------------------------------- -------------------------------------------------------------------------------
Name CX2341X_DEC_SET_AUDIO_OUTPUT
Enum 27/0x1B
Description
Select audio output format
Param[0]
Bitmask:
0:1 Data size:
'00' 16 bit
'01' 20 bit
'10' 24 bit
2:7 Unused
8:9 Mode:
'00' 2 channels
'01' 4 channels
'10' 6 channels
'11' 6 channels with one line data mode
(for left justified MSB first mode, 20 bit only)
10:11 Unused
12:13 Channel format:
'00' right justified MSB first mode
'01' left justified MSB first mode
'10' I2S mode
14:15 Unused
16:21 Right justify bit count
22:31 Unused
-------------------------------------------------------------------------------
Name CX2341X_DEC_SET_AV_DELAY
Enum 28/0x1C
Description
Set audio/video delay in 90Khz ticks
Param[0]
0=A/V in sync, negative=audio lags, positive=video lags
-------------------------------------------------------------------------------
Name CX2341X_DEC_SET_PREBUFFERING Name CX2341X_DEC_SET_PREBUFFERING
Enum 30/0x1E Enum 30/0x1E
Description Description

2
Documentation/video4linux/cx2341x/fw-encoder-api.txt
View file

@ -216,7 +216,7 @@ Param[1]
Name CX2341X_ENC_SET_3_2_PULLDOWN Name CX2341X_ENC_SET_3_2_PULLDOWN
Enum 177/0xB1 Enum 177/0xB1
Description Description
3:2 pulldown properties 3:2 pulldown properties (This command is not implemented in the firmware)
Param[0] Param[0]
0=enabled 0=enabled
1=disabled 1=disabled