1 files changed, 18 insertions, 40 deletions

diff --git a/Documentation/video4linux/cx2341x/fw-decoder-api.txt b/Documentation/video4linux/cx2341x/fw-decoder-api.txt
index 78bf5f21e51..8c317b7a4fc 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)
 
 -------------------------------------------------------------------------------
 
@@ -32,6 +32,10 @@ Description
         playback stops at specified PTS.
 Param[0]
         Display 0=last frame, 1=black
+        Note: this takes effect immediately, so if you want to wait for a PTS,
+        then use '0', otherwise the screen goes to black at once.
+        You can call this later (even if there is no playback) with a 1 value
+        to set the screen to black.
 Param[1]
         PTS low
 Param[2]
@@ -60,8 +64,12 @@ Param[0]
             31   Speed:
                      '0' slow
                      '1' fast
+        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
+        Note: to make reverse playback work you have to write full GOPs in
+        reverse order.
 Param[2]
         Picture mask:
             1=I frames
@@ -69,13 +77,16 @@ Param[2]
             7=I, P, B frames
 Param[3]
         B frames per GOP (for reverse play only)
+        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)
 
 -------------------------------------------------------------------------------
 
@@ -212,6 +223,7 @@ Description
         Select audio mode
 Param[0]
         Dual mono mode action
+            0=Stereo, 1=Left, 2=Right, 3=Mono, 4=Swap, -1=Unchanged
 Param[1]
         Stereo mode action:
             0=Stereo, 1=Left, 2=Right, 3=Mono, 4=Swap, -1=Unchanged
@@ -224,7 +236,10 @@ Description
         Setup firmware to notify the host about a particular event.
         Counterpart to API 0xD5
 Param[0]
-        Event: 0=Audio mode change between stereo and dual channel
+        Event: 0=Audio mode change between mono, (joint) stereo and dual channel.
+        Event: 3=Decoder started
+        Event: 4=Unknown: goes off 10-15 times per second while decoding.
+        Event: 5=Some sync event: goes off once per frame.
 Param[1]
         Notification 0=disabled, 1=enabled
 Param[2]
@@ -273,43 +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