diff options
| author | Hans Verkuil <hverkuil@xs4all.nl> | 2006-12-18 22:43:36 -0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@infradead.org> | 2007-02-21 13:34:13 -0200 |
| commit | 20a919f7960df1c0bf1cb4f637149ed4b6bc9ec3 (patch) | |
| tree | 42dc57863659eb45f97b46c40e97ca12bba14858 /Documentation/video4linux/cx2341x/fw-decoder-api.txt | |
| parent | e12ceaf4962d804320d639faed1da61e2cb85723 (diff) | |
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>
Diffstat (limited to 'Documentation/video4linux/cx2341x/fw-decoder-api.txt')
| -rw-r--r-- | Documentation/video4linux/cx2341x/fw-decoder-api.txt | 48 |
1 files changed, 6 insertions, 42 deletions
diff --git a/Documentation/video4linux/cx2341x/fw-decoder-api.txt b/Documentation/video4linux/cx2341x/fw-decoder-api.txt index 15c388b8bd1..1345d267c5f 100644 --- a/Documentation/video4linux/cx2341x/fw-decoder-api.txt +++ b/Documentation/video4linux/cx2341x/fw-decoder-api.txt @@ -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 |