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V4L/DVB (4985): Update cx2341x documentation. 

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.
Param[1]
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:
'0' slow
'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.
Param[1]
Direction: 0=forward, 1=reverse
@ -77,15 +77,16 @@ Param[2]
7=I, P, B frames
Param[3]
B frames per GOP (for reverse play only)
Note: apparently this does not work. For reverse play I can only make it
work by selecting I or I and P frames in the Picture mask.
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.
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
Enum 30/0x1E
Description

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

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