Remove paUtilVariableHostBufferSizePartialUsageAllowed

DirectSound was the only host API using this mode, and its usage was
removed in the previous commit, making this mode dead code. As discussed
in that commit the value proposition of this mode is unclear, and it
does not behave correctly around stream start (priming) as shown in
PortAudio#770.

src/common/pa_process.c

@@ -1287,18 +1287,15 @@ static void CopyTempOutputBuffersToHostOutputBuffers( PaUtilBufferProcessor *bp)
     data from the temporary output buffer into the host output buffers, then
     from the host input buffers into the temporary input buffers. Calling the
     streamCallback when necessary.
-    When processPartialUserBuffers is 0, all available input data will be
-    consumed and all available output space will be filled. When
-    processPartialUserBuffers is non-zero, as many full user buffers
-    as possible will be processed, but partial buffers will not be consumed.
+    All available input data will be consumed and all available output space
+    will be filled.
 */
 static unsigned long AdaptingProcess( PaUtilBufferProcessor *bp,
-        int *streamCallbackResult, int processPartialUserBuffers )
+        int *streamCallbackResult )
 {
     void *userInput, *userOutput;
     unsigned long framesProcessed = 0;
     unsigned long framesAvailable;
-    unsigned long endProcessingMinFrameCount;
     unsigned long maxFramesToCopy;
     PaUtilChannelDescriptor *hostInputChannels, *hostOutputChannels;
     unsigned int frameCount;
@@ -1310,15 +1307,10 @@ static unsigned long AdaptingProcess( PaUtilBufferProcessor *bp,
 
     framesAvailable = bp->hostInputFrameCount[0] + bp->hostInputFrameCount[1];/* this is assumed to be the same as the output buffer's frame count */
 
-    if( processPartialUserBuffers )
-        endProcessingMinFrameCount = 0;
-    else
-        endProcessingMinFrameCount = (bp->framesPerUserBuffer - 1);
-
     /* Fill host output with remaining frames in user output (tempOutputBuffer) */
     CopyTempOutputBuffersToHostOutputBuffers( bp );
 
-    while( framesAvailable > endProcessingMinFrameCount )
+    while( framesAvailable >= bp->framesPerUserBuffer )
     {
 
         if( bp->framesInTempOutputBuffer == 0 && *streamCallbackResult != paContinue )
@@ -1612,16 +1604,7 @@ unsigned long PaUtil_EndBufferProcessing( PaUtilBufferProcessor* bp, int *stream
         {
             /* full duplex */
 
-            if( bp->hostBufferSizeMode == paUtilVariableHostBufferSizePartialUsageAllowed  )
-            {
-                framesProcessed = AdaptingProcess( bp, streamCallbackResult,
-                        0 /* dont process partial user buffers */ );
-            }
-            else
-            {
-                framesProcessed = AdaptingProcess( bp, streamCallbackResult,
-                        1 /* process partial user buffers */ );
-            }
+            framesProcessed = AdaptingProcess( bp, streamCallbackResult );
         }
         else if( bp->inputChannelCount != 0 )
         {

src/common/pa_process.h

@@ -225,15 +225,6 @@ typedef enum {
 
 /** Nothing is known about the host buffer size. */
     paUtilUnknownHostBufferSize,
-
-/** The host buffer size varies, and the client does not require the buffer
- processor to consume all of the input and fill all of the output buffer. This
- is useful when the implementation has access to the host API's circular buffer
- and only needs to consume/fill some of it, not necessarily all of it, with each
- call to the buffer processor. This is the only mode where
- PaUtil_EndBufferProcessing() may not consume the whole buffer.
-*/
-    paUtilVariableHostBufferSizePartialUsageAllowed
 }PaUtilHostBufferSizeMode;
 
 
@@ -652,9 +643,7 @@ void PaUtil_BeginBufferProcessing( PaUtilBufferProcessor* bufferProcessor,
  wasn't generated by the terminating callback.
 
  @return The number of frames processed. This usually corresponds to the
- number of frames specified by the PaUtil_Set*FrameCount functions, except in
- the paUtilVariableHostBufferSizePartialUsageAllowed buffer size mode when a
- smaller value may be returned.
+ number of frames specified by the PaUtil_Set*FrameCount functions.
 */
 unsigned long PaUtil_EndBufferProcessing( PaUtilBufferProcessor* bufferProcessor,
         int *callbackResult );

src/hostapi/asihpi/pa_linux_asihpi.c

@@ -1322,9 +1322,6 @@ static void PaAsiHpi_StreamComponentDump( PaAsiHpiStreamComponent *streamComp,
     case paUtilUnknownHostBufferSize:
         PA_DEBUG(( "[unknown] " ));
         break;
-    case paUtilVariableHostBufferSizePartialUsageAllowed:
-        PA_DEBUG(( "[variable] " ));
-        break;
     }
     PA_DEBUG(( "(%d max)\n", streamComp->tempBufferSize / streamComp->bytesPerFrame ));
     /* HPI hardware settings */