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hotplug wmme: clarify confusing device append logic in ScanDeviceInfos(): instead of using newDeviceCount for three different purposes, add new variables: initializedInfosCount (counts the number of currently valid device infos), deviceIndex (index of device whose info is being initialized).

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This commit is contained in:
Ross Bencina 2016-09-18 16:33:08 +10:00
commit a9248a2f69
1 changed files with 21 additions and 14 deletions
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35
src/hostapi/wmme/pa_win_wmme.c
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@ -1413,6 +1413,7 @@ static PaError ScanDeviceInfos( struct PaUtilHostApiRepresentation *hostApi, PaH
int inputDeviceCount, outputDeviceCount;
int maximumPossibleDeviceCount;
PaWinMmeDeviceInfo *deviceInfoArray;
int initializedInfosCount;
int deviceInfoInitializationSucceeded;
PaTime defaultLowLatency, defaultHighLatency;
DWORD waveInPreferredDevice, waveOutPreferredDevice;
@ -1453,6 +1454,8 @@ static PaError ScanDeviceInfos( struct PaUtilHostApiRepresentation *hostApi, PaH
(DWORD_PTR)&waveOutPreferredDevice, (DWORD_PTR)&preferredDeviceStatusFlags ) != MMSYSERR_NOERROR )
waveOutPreferredDevice = WAVE_MAPPER;
initializedInfosCount = 0; /* incremented after successfully appending to deviceInfoArray */
maximumPossibleDeviceCount = 0;
#ifdef PAWIN_WMME_NO_WAVE_MAPPER
@ -1514,7 +1517,8 @@ static PaError ScanDeviceInfos( struct PaUtilHostApiRepresentation *hostApi, PaH
for( i = -1; i < inputDeviceCount; ++i ){
UINT winMmeDeviceId = (UINT)((i==-1) ? WAVE_MAPPER : i);
#endif
PaWinMmeDeviceInfo *wmmeDeviceInfo = &deviceInfoArray[ *newDeviceCount ];
int deviceIndex = initializedInfosCount; /* host-api local index. append at end of deviceInfoArray */
PaWinMmeDeviceInfo *wmmeDeviceInfo = &deviceInfoArray[ deviceIndex ];
PaDeviceInfo *deviceInfo = &wmmeDeviceInfo->inheritedDeviceInfo;
deviceInfo->structVersion = 3;
deviceInfo->hostApi = hostApiIndex;
@ -1541,22 +1545,23 @@ static PaError ScanDeviceInfos( struct PaUtilHostApiRepresentation *hostApi, PaH
if( outArgument->defaultInputDevice == paNoDevice )
{
/* if there is currently no default device, use the first one available */
outArgument->defaultInputDevice = *newDeviceCount;
outArgument->defaultInputDevice = deviceIndex;
}
else if( winMmeDeviceId == waveInPreferredDevice )
{
/* set the default device to the system preferred device */
outArgument->defaultInputDevice = *newDeviceCount;
outArgument->defaultInputDevice = deviceIndex;
}
deviceInfo->connectionId = AssignDeviceConnectionId(
hostApi->deviceInfos, hostApi->info.deviceCount,
outArgument->deviceInfos, *newDeviceCount,
outArgument->deviceInfos, initializedInfosCount,
wmmeDeviceInfo->deviceInterfaceName, /* isInput= */ 1 );
outArgument->deviceInfos[ *newDeviceCount ] = deviceInfo;
outArgument->deviceInfos[ deviceIndex ] = deviceInfo;
outArgument->inputDeviceCount++;
(*newDeviceCount)++;
initializedInfosCount++;
}
}
}
@ -1570,7 +1575,8 @@ static PaError ScanDeviceInfos( struct PaUtilHostApiRepresentation *hostApi, PaH
for( i = -1; i < outputDeviceCount; ++i ){
UINT winMmeDeviceId = (UINT)((i==-1) ? WAVE_MAPPER : i);
#endif
PaWinMmeDeviceInfo *wmmeDeviceInfo = &deviceInfoArray[ *newDeviceCount ];
int deviceIndex = initializedInfosCount; /* host-api local index. append at end of deviceInfoArray */
PaWinMmeDeviceInfo *wmmeDeviceInfo = &deviceInfoArray[ deviceIndex ];
PaDeviceInfo *deviceInfo = &wmmeDeviceInfo->inheritedDeviceInfo;
deviceInfo->structVersion = 3;
deviceInfo->hostApi = hostApiIndex;
@ -1597,37 +1603,38 @@ static PaError ScanDeviceInfos( struct PaUtilHostApiRepresentation *hostApi, PaH
if( outArgument->defaultOutputDevice == paNoDevice )
{
/* if there is currently no default device, use the first one available */
outArgument->defaultOutputDevice = *newDeviceCount;
outArgument->defaultOutputDevice = deviceIndex;
}
else if( winMmeDeviceId == waveOutPreferredDevice )
{
/* set the default device to the system preferred device */
outArgument->defaultOutputDevice = *newDeviceCount;
outArgument->defaultOutputDevice = deviceIndex;
}
deviceInfo->connectionId = AssignDeviceConnectionId(
hostApi->deviceInfos, hostApi->info.deviceCount,
outArgument->deviceInfos, *newDeviceCount,
outArgument->deviceInfos, initializedInfosCount,
wmmeDeviceInfo->deviceInterfaceName, /* isInput= */ 0 );
outArgument->deviceInfos[ *newDeviceCount ] = deviceInfo;
outArgument->deviceInfos[ deviceIndex ] = deviceInfo;
outArgument->outputDeviceCount++;
(*newDeviceCount)++;
initializedInfosCount++;
}
}
}
}
*newDeviceCount = initializedInfosCount;
*scanResults = outArgument;
return result;
error:
if( outArgument )
{
FreeDeviceInfos( winMmeHostApi->allocations, outArgument->deviceInfos, *newDeviceCount );
FreeDeviceInfos( winMmeHostApi->allocations, outArgument->deviceInfos, initializedInfosCount );
}
*newDeviceCount = 0;
return result;
}