ASIO: add PaAsio_GetSampleRate() function

examples/pa_devs.c

@@ -167,7 +167,11 @@ int main(void)
         {   /* Use wide char on windows, so we can show UTF-8 encoded device names */
             wchar_t wideName[MAX_PATH];
             MultiByteToWideChar(CP_UTF8, 0, deviceInfo->name, -1, wideName, MAX_PATH-1);
+        #if __USE_MINGW_ANSI_STDIO
+            wprintf( L"Name                        = %S\n", wideName );
+        #else
             wprintf( L"Name                        = %s\n", wideName );
+        #endif
         }
 #else
         printf( "Name                        = %s\n", deviceInfo->name );
@@ -186,6 +190,7 @@ int main(void)
 /* ASIO specific latency information */
         if( Pa_GetHostApiInfo( deviceInfo->hostApi )->type == paASIO ){
             long minLatency, maxLatency, preferredLatency, granularity;
+            double currentSampleRate;
 
             err = PaAsio_GetAvailableLatencyValues( i,
                     &minLatency, &maxLatency, &preferredLatency, &granularity );
@@ -198,6 +203,9 @@ int main(void)
                 printf( "ASIO buffer granularity     = power of 2\n" );
             else
                 printf( "ASIO buffer granularity     = %ld\n", granularity  );
+
+            err = PaAsio_GetSampleRate( i, &currentSampleRate );
+            printf( "ASIO current sample rate    = %8.2f\n", currentSampleRate);
         }
 #endif /* PA_USE_ASIO */
 #endif /* WIN32 */

include/pa_asio.h

@@ -78,6 +78,18 @@ PaError PaAsio_GetAvailableBufferSizes( PaDeviceIndex device,
 #define PaAsio_GetAvailableLatencyValues PaAsio_GetAvailableBufferSizes
 
 
+/** Get the current sample rate of the specified device (at the time of PortAudio initialization).
+
+ @param device The global index of the device about which the query is being made.
+ @param sampleRate A pointer to the location which will receive the current sample rate.
+
+ If the current sample rate is unknown, sampleRate will be set to 0.
+
+ @see ASIOGetSampleRate in the ASIO SDK.
+*/
+PaError PaAsio_GetSampleRate( PaDeviceIndex device, double* sampleRate );
+
+
 /** Display the ASIO control panel for the specified device.
 
   @param device The global index of the device whose control panel is to be displayed.

src/hostapi/asio/pa_asio.cpp

@@ -266,6 +266,7 @@ typedef struct PaAsioDriverInfo
     ASIODriverInfo asioDriverInfo;
     long inputChannelCount, outputChannelCount;
     long bufferMinSize, bufferMaxSize, bufferPreferredSize, bufferGranularity;
+    ASIOSampleRate sampleRate;
     bool postOutput;
 }
 PaAsioDriverInfo;
@@ -894,6 +895,7 @@ typedef struct PaAsioDeviceInfo
     long maxBufferSize;
     long preferredBufferSize;
     long bufferGranularity;
+    ASIOSampleRate sampleRate;
 
     ASIOChannelInfo *asioChannelInfos;
 }
@@ -928,6 +930,32 @@ PaError PaAsio_GetAvailableBufferSizes( PaDeviceIndex device,
     return result;
 }
 
+
+PaError PaAsio_GetSampleRate( PaDeviceIndex device, double* sampleRate )
+{
+    PaError result;
+    PaUtilHostApiRepresentation *hostApi;
+    PaDeviceIndex hostApiDevice;
+
+    result = PaUtil_GetHostApiRepresentation( &hostApi, paASIO );
+
+    if( result == paNoError )
+    {
+        result = PaUtil_DeviceIndexToHostApiDeviceIndex( &hostApiDevice, device, hostApi );
+
+        if( result == paNoError )
+        {
+            PaAsioDeviceInfo *asioDeviceInfo =
+                    (PaAsioDeviceInfo*)hostApi->deviceInfos[hostApiDevice];
+
+            *sampleRate = asioDeviceInfo->sampleRate;
+        }
+    }
+
+    return result;
+}
+
+
 /* Unload whatever we loaded in LoadAsioDriver().
 */
 static void UnloadAsioDriver( void )
@@ -986,6 +1014,17 @@ static PaError LoadAsioDriver( PaAsioHostApiRepresentation *asioHostApi, const c
         goto error;
     }
 
+    if( (asioError = ASIOGetSampleRate(&driverInfo->sampleRate)) != ASE_OK )
+    {
+    #if 1
+        driverInfo->sampleRate = 0;
+    #else
+        result = paUnanticipatedHostError;
+        PA_ASIO_SET_LAST_ASIO_ERROR( asioError );
+        goto error;
+    #endif
+    }
+
     if( ASIOOutputReady() == ASE_OK )
         driverInfo->postOutput = true;
     else
@@ -1034,10 +1073,12 @@ static PaError InitPaDeviceInfoFromAsioDriver( PaAsioHostApiRepresentation *asio
         PA_DEBUG(("PaAsio_Initialize: drv:%d bufferMaxSize       = %d\n", driverIndex, paAsioDriver.info.bufferMaxSize));
         PA_DEBUG(("PaAsio_Initialize: drv:%d bufferPreferredSize = %d\n", driverIndex, paAsioDriver.info.bufferPreferredSize));
         PA_DEBUG(("PaAsio_Initialize: drv:%d bufferGranularity   = %d\n", driverIndex, paAsioDriver.info.bufferGranularity));
+        PA_DEBUG(("PaAsio_Initialize: drv:%d sampleRate          = %d\n", driverIndex, paAsioDriver.info.sampleRate));
 
         deviceInfo->maxInputChannels  = paAsioDriver.info.inputChannelCount;
         deviceInfo->maxOutputChannels = paAsioDriver.info.outputChannelCount;
 
+
         deviceInfo->defaultSampleRate = 0.;
         bool foundDefaultSampleRate = false;
         for( int j=0; j < PA_DEFAULTSAMPLERATESEARCHORDER_COUNT_; ++j )
@@ -1095,7 +1136,7 @@ static PaError InitPaDeviceInfoFromAsioDriver( PaAsioHostApiRepresentation *asio
         asioDeviceInfo->maxBufferSize = paAsioDriver.info.bufferMaxSize;
         asioDeviceInfo->preferredBufferSize = paAsioDriver.info.bufferPreferredSize;
         asioDeviceInfo->bufferGranularity = paAsioDriver.info.bufferGranularity;
-
+        asioDeviceInfo->sampleRate = paAsioDriver.info.sampleRate;
 
         asioDeviceInfo->asioChannelInfos = (ASIOChannelInfo*)PaUtil_GroupAllocateZeroInitializedMemory(
                 asioHostApi->allocations,