Re: Can't get kino or dvgrab to work

On 20 Oct, Dan Dennedy wrote:
> On Tue, Oct 20, 2009 at 11:28 AM, Stefan Richter
> <[email protected]> wrote:
>> Uh, I left an important fact out of my "report":  Lately I used this
>> camcorder without a tape inserted, in webcam mode.  (I never ever record
>> anything, I got this camcorder for nothing else than driver testing.)
> 
> Yes, that is important
[...]
> I believe I have a limitation in detecting the exact state. IOW, I
> believe I may not be able to determine the difference between this and
> the end-of-tape. I will have to review this use case to be sure.  For
> now, for this use case, -noavc is required.

Makes sense, in retrospect.

[...]
>>> There is a big test in the middle of captureThreadRun() in dvgrab.cc
>>> around a call to writeFrame(). It would be interesting test for
>>> someone who is affected by this bug to comment the if lines and call
>>> writeFrame unconditionally to see if it resolves.
>>
>> Hmm.  I left the three blocks with "buffer underrun...", "damaged
>> frame...", and "frame dropped..." intact because these messages were
>> never printed, and changed the else block thus:
> 
> correct, and you changed what I was hinting at, but this is not the
> part of the code that is doing end-of-tape detection.

Right.  When I restore that code and instead mess with this:

--- dvgrab-3.5.orig/dvgrab.cc
+++ dvgrab-3.5/dvgrab.cc
@@ -1272,15 +1272,6 @@ bool DVgrab::done()
 {
 	if ( m_reader_active )
 	{
-		// Stop capture at end of tape
-		if ( !m_interactive && m_writer && m_writer->GetFileSize() > 0 && m_avc && !m_isRecordMode )
-		{
-			m_transportStatus = m_avc->TransportStatus( m_node );
-			if ( AVC1394_MASK_RESPONSE_OPERAND( m_transportStatus, 3 ) == AVC1394_VCR_OPERAND_WIND_STOP
-			     && AVC1394_MASK_OPCODE( m_transportStatus ) == AVC1394_VCR_RESPONSE_TRANSPORT_STATE_WIND )
-			return true;
-		}
-		
 		timespec t = {0, 125000000L};
 		return ( nanosleep( &t, NULL ) == -1 );
 	}


then dvgrab does not quit. (No tape, no -noavc.)  Indeed,

--- dvgrab-3.5.orig/dvgrab.cc
+++ dvgrab-3.5/dvgrab.cc
@@ -1292,6 +1292,10 @@ bool DVgrab::done()
 {
 	if ( m_reader_active )
 	{
+		m_transportStatus = m_avc->TransportStatus( m_node );
+		fprintf(stderr, "operand 0x%02x, opcode 0x%08x\n",
+				AVC1394_MASK_RESPONSE_OPERAND( m_transportStatus, 3 ),
+				AVC1394_MASK_OPCODE( m_transportStatus ));
 		timespec t = {0, 125000000L};
 		return ( nanosleep( &t, NULL ) == -1 );
 	}

logs "operand 0x60, opcode 0x0000c400", i.e. AVC1394_VCR_OPERAND_WIND_STOP
and AVC1394_VCR_RESPONSE_TRANSPORT_STATE_WIND.

The camcorder actually emits a quite mechanical noise in this state.
There is a blinking tape icon on the LCD which, according to the manual,
appropriately tells me that no tape is inserted.
-- 
Stefan Richter
-=====-==--= =-=- =-=--
http://arcgraph.de/sr/


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