Commit 20a919f7 authored by Hans Verkuil's avatar Hans Verkuil Committed by Mauro Carvalho Chehab
Browse files

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: default avatarHans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@infradead.org>
parent e12ceaf4

Documentation/video4linux/cx2341x/fw-decoder-api.txt

+6 −42
Original line number Diff line number Diff line
@@ -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

Documentation/video4linux/cx2341x/fw-encoder-api.txt

+1 −1
Original line number Diff line number Diff line
@@ -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