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reactos/sdk/lib/drivers/sound/mmixer/wave.c
Oleg Dubinskiy 5949c20d97
[MMIXER] Fix additional data size initialization for different audio formats (#6753) 
Calculate size of the additinal data based on the format tag specified by the caller.
For PCM wave format, it should be zero, and for all others,
it should be taken from cbSize member of WAVEFORMATEX structure.
- Initialize data size for each format appropriately.
- Append it to the total pin connect allocation size, to allocate enough memory for it.
- Use it as additional data size for requested wave format.
- Append it to the total size of data format.
- Add SAL2 annotations for MMixerInitializeDataFormat function.
Fixes two crashes in winmm:capture and winmm:wave winetests, which have been introduced by 12b3272d9e.
So this is an addendum to that commit.
CORE-19514
2024-04-18 23:19:35 +02:00

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/*
* COPYRIGHT: See COPYING in the top level directory
* PROJECT: ReactOS Kernel Streaming
* FILE: lib/drivers/sound/mmixer/wave.c
* PURPOSE: Wave Handling Functions
* PROGRAMMER: Johannes Anderwald
*/
#include "precomp.h"
// #define NDEBUG
#include <debug.h>
const GUID KSPROPSETID_Connection = {0x1D58C920L, 0xAC9B, 0x11CF, {0xA5, 0xD6, 0x28, 0xDB, 0x04, 0xC1, 0x00, 0x00}};
const GUID KSDATAFORMAT_SPECIFIER_WAVEFORMATEX = {0x05589f81L, 0xc356, 0x11ce, {0xbf, 0x01, 0x00, 0xaa, 0x00, 0x55, 0x59, 0x5a}};
const GUID KSDATAFORMAT_SUBTYPE_PCM = {0x00000001L, 0x0000, 0x0010, {0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}};
const GUID KSDATAFORMAT_TYPE_AUDIO = {0x73647561L, 0x0000, 0x0010, {0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}};
const GUID KSINTERFACESETID_Standard = {0x1A8766A0L, 0x62CE, 0x11CF, {0xA5, 0xD6, 0x28, 0xDB, 0x04, 0xC1, 0x00, 0x00}};
const GUID KSMEDIUMSETID_Standard = {0x4747B320L, 0x62CE, 0x11CF, {0xA5, 0xD6, 0x28, 0xDB, 0x04, 0xC1, 0x00, 0x00}};
typedef struct
{
ULONG SampleRate;
ULONG Bit8Mono;
ULONG Bit8Stereo;
ULONG Bit16Mono;
ULONG Bit16Stereo;
}AUDIO_RANGE;
#define AUDIO_TEST_RANGE (5)
static AUDIO_RANGE TestRange[AUDIO_TEST_RANGE] =
{
{
11025,
WAVE_FORMAT_1M08,
WAVE_FORMAT_1S08,
WAVE_FORMAT_1M16,
WAVE_FORMAT_1S16
},
{
22050,
WAVE_FORMAT_2M08,
WAVE_FORMAT_2S08,
WAVE_FORMAT_2M16,
WAVE_FORMAT_2S16
},
{
44100,
WAVE_FORMAT_4M08,
WAVE_FORMAT_4S08,
WAVE_FORMAT_4M16,
WAVE_FORMAT_4S16
},
{
48000,
WAVE_FORMAT_48M08,
WAVE_FORMAT_48S08,
WAVE_FORMAT_48M16,
WAVE_FORMAT_48S16
},
{
96000,
WAVE_FORMAT_96M08,
WAVE_FORMAT_96S08,
WAVE_FORMAT_96M16,
WAVE_FORMAT_96S16
}
};
PKSPIN_CONNECT
MMixerAllocatePinConnect(
IN PMIXER_CONTEXT MixerContext,
ULONG DataFormatSize)
{
return MixerContext->Alloc(sizeof(KSPIN_CONNECT) + DataFormatSize);
}
MIXER_STATUS
MMixerGetWaveInfoByIndexAndType(
IN PMIXER_LIST MixerList,
IN ULONG DeviceIndex,
IN ULONG bWaveInType,
OUT LPWAVE_INFO *OutWaveInfo)
{
ULONG Index = 0;
PLIST_ENTRY Entry, ListHead;
LPWAVE_INFO WaveInfo;
if (bWaveInType)
ListHead = &MixerList->WaveInList;
else
ListHead = &MixerList->WaveOutList;
/* get first entry */
Entry = ListHead->Flink;
while(Entry != ListHead)
{
WaveInfo = (LPWAVE_INFO)CONTAINING_RECORD(Entry, WAVE_INFO, Entry);
if (Index == DeviceIndex)
{
*OutWaveInfo = WaveInfo;
return MM_STATUS_SUCCESS;
}
Index++;
Entry = Entry->Flink;
}
return MM_STATUS_INVALID_PARAMETER;
}
VOID
MMixerInitializeDataFormat(
_Inout_ PKSDATAFORMAT_WAVEFORMATEX DataFormat,
_In_ LPWAVEFORMATEX WaveFormatEx,
_In_ DWORD cbSize)
{
DataFormat->WaveFormatEx.wFormatTag = WaveFormatEx->wFormatTag;
DataFormat->WaveFormatEx.nChannels = WaveFormatEx->nChannels;
DataFormat->WaveFormatEx.nSamplesPerSec = WaveFormatEx->nSamplesPerSec;
DataFormat->WaveFormatEx.nBlockAlign = WaveFormatEx->nBlockAlign;
DataFormat->WaveFormatEx.nAvgBytesPerSec = WaveFormatEx->nAvgBytesPerSec;
DataFormat->WaveFormatEx.wBitsPerSample = WaveFormatEx->wBitsPerSample;
DataFormat->WaveFormatEx.cbSize = cbSize;
DataFormat->DataFormat.FormatSize = sizeof(KSDATAFORMAT) + sizeof(WAVEFORMATEX) + cbSize;
DataFormat->DataFormat.Flags = 0;
DataFormat->DataFormat.Reserved = 0;
DataFormat->DataFormat.MajorFormat = KSDATAFORMAT_TYPE_AUDIO;
DataFormat->DataFormat.SubFormat = KSDATAFORMAT_SUBTYPE_PCM;
DataFormat->DataFormat.Specifier = KSDATAFORMAT_SPECIFIER_WAVEFORMATEX;
DataFormat->DataFormat.SampleSize = 4;
/* Write additional fields for Extensible audio format */
if (WaveFormatEx->wFormatTag == WAVE_FORMAT_EXTENSIBLE)
{
PWAVEFORMATEXTENSIBLE WaveFormatExt = (PWAVEFORMATEXTENSIBLE)&DataFormat->WaveFormatEx;
WaveFormatExt->SubFormat = KSDATAFORMAT_SUBTYPE_PCM;
WaveFormatExt->Samples.wValidBitsPerSample = WaveFormatEx->wBitsPerSample;
if (WaveFormatEx->nChannels == 0)
WaveFormatExt->dwChannelMask = KSAUDIO_SPEAKER_DIRECTOUT;
else if (WaveFormatEx->nChannels == 1)
WaveFormatExt->dwChannelMask = KSAUDIO_SPEAKER_MONO;
else if (WaveFormatEx->nChannels == 2)
WaveFormatExt->dwChannelMask = KSAUDIO_SPEAKER_STEREO;
else if (WaveFormatEx->nChannels == 4)
WaveFormatExt->dwChannelMask = KSAUDIO_SPEAKER_QUAD;
else if (WaveFormatEx->nChannels == 5)
WaveFormatExt->dwChannelMask = KSAUDIO_SPEAKER_5POINT1;
else if (WaveFormatEx->nChannels == 7)
WaveFormatExt->dwChannelMask = KSAUDIO_SPEAKER_7POINT1;
}
}
MIXER_STATUS
MMixerGetAudioPinDataRanges(
IN PMIXER_CONTEXT MixerContext,
IN HANDLE hDevice,
IN ULONG PinId,
IN OUT PKSMULTIPLE_ITEM * OutMultipleItem)
{
KSP_PIN PinProperty;
ULONG BytesReturned = 0;
MIXER_STATUS Status;
PKSMULTIPLE_ITEM MultipleItem;
/* retrieve size of data ranges buffer */
PinProperty.Reserved = 0;
PinProperty.PinId = PinId;
PinProperty.Property.Set = KSPROPSETID_Pin;
PinProperty.Property.Id = KSPROPERTY_PIN_DATARANGES;
PinProperty.Property.Flags = KSPROPERTY_TYPE_GET;
Status = MixerContext->Control(hDevice, IOCTL_KS_PROPERTY, (PVOID)&PinProperty, sizeof(KSP_PIN), (PVOID)NULL, 0, &BytesReturned);
if (Status != MM_STATUS_MORE_ENTRIES)
{
return Status;
}
MultipleItem = MixerContext->Alloc(BytesReturned);
if (!MultipleItem)
{
/* not enough memory */
return MM_STATUS_NO_MEMORY;
}
Status = MixerContext->Control(hDevice, IOCTL_KS_PROPERTY, (PVOID)&PinProperty, sizeof(KSP_PIN), (PVOID)MultipleItem, BytesReturned, &BytesReturned);
if (Status != MM_STATUS_SUCCESS)
{
/* failed */
MixerContext->Free(MultipleItem);
return Status;
}
/* save result */
*OutMultipleItem = MultipleItem;
return Status;
}
MIXER_STATUS
MMixerFindAudioDataRange(
PKSMULTIPLE_ITEM MultipleItem,
PKSDATARANGE_AUDIO * OutDataRangeAudio)
{
ULONG Index;
PKSDATARANGE_AUDIO DataRangeAudio;
PKSDATARANGE DataRange;
DataRange = (PKSDATARANGE) (MultipleItem + 1);
for(Index = 0; Index < MultipleItem->Count; Index++)
{
if (DataRange->FormatSize == sizeof(KSDATARANGE_AUDIO))
{
DataRangeAudio = (PKSDATARANGE_AUDIO)DataRange;
if (IsEqualGUIDAligned(&DataRangeAudio->DataRange.MajorFormat, &KSDATAFORMAT_TYPE_AUDIO) &&
IsEqualGUIDAligned(&DataRangeAudio->DataRange.SubFormat, &KSDATAFORMAT_SUBTYPE_PCM) &&
IsEqualGUIDAligned(&DataRangeAudio->DataRange.Specifier, &KSDATAFORMAT_SPECIFIER_WAVEFORMATEX))
{
DPRINT("Min Sample %u Max Sample %u Min Bits %u Max Bits %u Max Channel %u\n", DataRangeAudio->MinimumSampleFrequency, DataRangeAudio->MaximumSampleFrequency,
DataRangeAudio->MinimumBitsPerSample, DataRangeAudio->MaximumBitsPerSample, DataRangeAudio->MaximumChannels);
*OutDataRangeAudio = DataRangeAudio;
return MM_STATUS_SUCCESS;
}
}
DataRange = (PKSDATARANGE)((ULONG_PTR)DataRange + DataRange->FormatSize);
}
return MM_STATUS_UNSUCCESSFUL;
}
MIXER_STATUS
MMixerOpenWavePin(
IN PMIXER_CONTEXT MixerContext,
IN PMIXER_LIST MixerList,
IN ULONG DeviceId,
IN ULONG PinId,
IN LPWAVEFORMATEX WaveFormatEx,
IN ACCESS_MASK DesiredAccess,
IN PIN_CREATE_CALLBACK CreateCallback,
IN PVOID Context,
OUT PHANDLE PinHandle)
{
PKSPIN_CONNECT PinConnect;
PKSDATAFORMAT_WAVEFORMATEX DataFormat;
LPMIXER_DATA MixerData;
NTSTATUS Status;
MIXER_STATUS MixerStatus;
DWORD cbSize;
MixerData = MMixerGetDataByDeviceId(MixerList, DeviceId);
if (!MixerData)
return MM_STATUS_INVALID_PARAMETER;
/* Enforce 0 for WAVE_FORMAT_PCM, which ignores extra information size */
cbSize = WaveFormatEx->wFormatTag == WAVE_FORMAT_PCM ? 0 : WaveFormatEx->cbSize;
/* allocate pin connect */
PinConnect = MMixerAllocatePinConnect(MixerContext, sizeof(KSDATAFORMAT_WAVEFORMATEX) + cbSize);
if (!PinConnect)
{
/* no memory */
return MM_STATUS_NO_MEMORY;
}
/* initialize pin connect struct */
MMixerInitializePinConnect(PinConnect, PinId);
/* get offset to dataformat */
DataFormat = (PKSDATAFORMAT_WAVEFORMATEX) (PinConnect + 1);
/* initialize with requested wave format */
MMixerInitializeDataFormat(DataFormat, WaveFormatEx, cbSize);
if (CreateCallback)
{
/* let the callback handle the creation */
MixerStatus = CreateCallback(Context, DeviceId, PinId, MixerData->hDevice, PinConnect, DesiredAccess, PinHandle);
}
else
{
/* now create the pin */
Status = KsCreatePin(MixerData->hDevice, PinConnect, DesiredAccess, PinHandle);
/* normalize status */
if (Status == STATUS_SUCCESS)
MixerStatus = MM_STATUS_SUCCESS;
else
MixerStatus = MM_STATUS_UNSUCCESSFUL;
}
/* free create info */
MixerContext->Free(PinConnect);
/* done */
return MixerStatus;
}
VOID
MMixerCheckFormat(
IN PKSDATARANGE_AUDIO DataRangeAudio,
IN LPWAVE_INFO WaveInfo,
IN ULONG bInput)
{
ULONG Index, SampleFrequency;
ULONG Result = 0;
for(Index = 0; Index < AUDIO_TEST_RANGE; Index++)
{
SampleFrequency = TestRange[Index].SampleRate;
if (DataRangeAudio->MinimumSampleFrequency <= SampleFrequency && DataRangeAudio->MaximumSampleFrequency >= SampleFrequency)
{
/* the audio adapter supports the sample frequency */
if (DataRangeAudio->MinimumBitsPerSample <= 8 && DataRangeAudio->MaximumBitsPerSample >= 8)
{
Result |= TestRange[Index].Bit8Mono;
if (DataRangeAudio->MaximumChannels > 1)
{
/* check if pin supports the sample rate in 8-Bit Stereo */
Result |= TestRange[Index].Bit8Stereo;
}
}
if (DataRangeAudio->MinimumBitsPerSample <= 16 && DataRangeAudio->MaximumBitsPerSample >= 16)
{
/* check if pin supports the sample rate in 16-Bit Mono */
Result |= TestRange[Index].Bit16Mono;
if (DataRangeAudio->MaximumChannels > 1)
{
/* check if pin supports the sample rate in 16-Bit Stereo */
Result |= TestRange[Index].Bit16Stereo;
}
}
}
}
if (bInput)
WaveInfo->u.InCaps.dwFormats = Result;
else
WaveInfo->u.OutCaps.dwFormats = Result;
DPRINT("Format %lx bInput %u\n", Result, bInput);
}
MIXER_STATUS
MMixerInitializeWaveInfo(
IN PMIXER_CONTEXT MixerContext,
IN PMIXER_LIST MixerList,
IN LPMIXER_DATA MixerData,
IN LPWSTR DeviceName,
IN ULONG bWaveIn,
IN ULONG PinCount,
IN PULONG Pins)
{
MIXER_STATUS Status;
PKSMULTIPLE_ITEM MultipleItem;
PKSDATARANGE_AUDIO DataRangeAudio;
LPWAVE_INFO WaveInfo;
WaveInfo = (LPWAVE_INFO)MixerContext->Alloc(sizeof(WAVE_INFO));
if (!WaveInfo)
return MM_STATUS_NO_MEMORY;
if (PinCount > 1)
{
/* FIXME support multiple pins for wave device */
DPRINT1("Implement support for multiple pins\n");
//ASSERT(PinCount == 1);
}
/* initialize wave info */
WaveInfo->DeviceId = MixerData->DeviceId;
WaveInfo->PinId = Pins[0];
/* sanity check */
ASSERT(wcslen(DeviceName) < MAXPNAMELEN);
/* copy device name */
if (bWaveIn)
{
wcscpy(WaveInfo->u.InCaps.szPname, DeviceName);
}
else
{
wcscpy(WaveInfo->u.OutCaps.szPname, DeviceName);
}
/* FIXME determine manufacturer / product id */
if (bWaveIn)
{
WaveInfo->u.InCaps.wMid = MM_MICROSOFT;
WaveInfo->u.InCaps.wPid = MM_PID_UNMAPPED;
WaveInfo->u.InCaps.vDriverVersion = 1;
}
else
{
WaveInfo->u.OutCaps.wMid = MM_MICROSOFT;
WaveInfo->u.OutCaps.wPid = MM_PID_UNMAPPED;
WaveInfo->u.OutCaps.vDriverVersion = 1;
}
/* get audio pin data ranges */
Status = MMixerGetAudioPinDataRanges(MixerContext, MixerData->hDevice, Pins[0], &MultipleItem);
if (Status != MM_STATUS_SUCCESS)
{
/* failed to get audio pin data ranges */
MixerContext->Free(WaveInfo);
return MM_STATUS_UNSUCCESSFUL;
}
/* find an KSDATARANGE_AUDIO range */
Status = MMixerFindAudioDataRange(MultipleItem, &DataRangeAudio);
if (Status != MM_STATUS_SUCCESS)
{
/* failed to find audio pin data range */
MixerContext->Free(MultipleItem);
MixerContext->Free(WaveInfo);
return MM_STATUS_UNSUCCESSFUL;
}
/* store channel count */
if (bWaveIn)
{
WaveInfo->u.InCaps.wChannels = DataRangeAudio->MaximumChannels;
}
else
{
WaveInfo->u.OutCaps.wChannels = DataRangeAudio->MaximumChannels;
}
/* get all supported formats */
MMixerCheckFormat(DataRangeAudio, WaveInfo, bWaveIn);
/* free dataranges buffer */
MixerContext->Free(MultipleItem);
if (bWaveIn)
{
InsertTailList(&MixerList->WaveInList, &WaveInfo->Entry);
MixerList->WaveInListCount++;
}
else
{
InsertTailList(&MixerList->WaveOutList, &WaveInfo->Entry);
MixerList->WaveOutListCount++;
}
return MM_STATUS_SUCCESS;
}
MIXER_STATUS
MMixerOpenWave(
IN PMIXER_CONTEXT MixerContext,
IN ULONG DeviceIndex,
IN ULONG bWaveIn,
IN LPWAVEFORMATEX WaveFormat,
IN PIN_CREATE_CALLBACK CreateCallback,
IN PVOID Context,
OUT PHANDLE PinHandle)
{
PMIXER_LIST MixerList;
MIXER_STATUS Status;
LPWAVE_INFO WaveInfo;
ACCESS_MASK DesiredAccess = 0;
/* verify mixer context */
Status = MMixerVerifyContext(MixerContext);
if (Status != MM_STATUS_SUCCESS)
{
/* invalid context passed */
return Status;
}
/* grab mixer list */
MixerList = (PMIXER_LIST)MixerContext->MixerContext;
/* find destination wave */
Status = MMixerGetWaveInfoByIndexAndType(MixerList, DeviceIndex, bWaveIn, &WaveInfo);
if (Status != MM_STATUS_SUCCESS)
{
/* failed to find wave info */
return MM_STATUS_INVALID_PARAMETER;
}
/* get desired access */
if (bWaveIn)
{
DesiredAccess |= GENERIC_READ;
}
else
{
DesiredAccess |= GENERIC_WRITE;
}
/* now try open the pin */
return MMixerOpenWavePin(MixerContext, MixerList, WaveInfo->DeviceId, WaveInfo->PinId, WaveFormat, DesiredAccess, CreateCallback, Context, PinHandle);
}
MIXER_STATUS
MMixerWaveInCapabilities(
IN PMIXER_CONTEXT MixerContext,
IN ULONG DeviceIndex,
OUT LPWAVEINCAPSW Caps)
{
PMIXER_LIST MixerList;
MIXER_STATUS Status;
LPWAVE_INFO WaveInfo;
/* verify mixer context */
Status = MMixerVerifyContext(MixerContext);
if (Status != MM_STATUS_SUCCESS)
{
/* invalid context passed */
return Status;
}
/* grab mixer list */
MixerList = (PMIXER_LIST)MixerContext->MixerContext;
/* find destination wave */
Status = MMixerGetWaveInfoByIndexAndType(MixerList, DeviceIndex, TRUE, &WaveInfo);
if (Status != MM_STATUS_SUCCESS)
{
/* failed to find wave info */
return MM_STATUS_UNSUCCESSFUL;
}
/* copy capabilities */
MixerContext->Copy(Caps, &WaveInfo->u.InCaps, sizeof(WAVEINCAPSW));
return MM_STATUS_SUCCESS;
}
MIXER_STATUS
MMixerWaveOutCapabilities(
IN PMIXER_CONTEXT MixerContext,
IN ULONG DeviceIndex,
OUT LPWAVEOUTCAPSW Caps)
{
PMIXER_LIST MixerList;
MIXER_STATUS Status;
LPWAVE_INFO WaveInfo;
/* verify mixer context */
Status = MMixerVerifyContext(MixerContext);
if (Status != MM_STATUS_SUCCESS)
{
/* invalid context passed */
return Status;
}
/* grab mixer list */
MixerList = (PMIXER_LIST)MixerContext->MixerContext;
/* find destination wave */
Status = MMixerGetWaveInfoByIndexAndType(MixerList, DeviceIndex, FALSE, &WaveInfo);
if (Status != MM_STATUS_SUCCESS)
{
/* failed to find wave info */
return MM_STATUS_UNSUCCESSFUL;
}
/* copy capabilities */
MixerContext->Copy(Caps, &WaveInfo->u.OutCaps, sizeof(WAVEOUTCAPSW));
return MM_STATUS_SUCCESS;
}
ULONG
MMixerGetWaveInCount(
IN PMIXER_CONTEXT MixerContext)
{
PMIXER_LIST MixerList;
MIXER_STATUS Status;
/* verify mixer context */
Status = MMixerVerifyContext(MixerContext);
if (Status != MM_STATUS_SUCCESS)
{
/* invalid context passed */
return Status;
}
/* grab mixer list */
MixerList = (PMIXER_LIST)MixerContext->MixerContext;
return MixerList->WaveInListCount;
}
ULONG
MMixerGetWaveOutCount(
IN PMIXER_CONTEXT MixerContext)
{
PMIXER_LIST MixerList;
MIXER_STATUS Status;
/* verify mixer context */
Status = MMixerVerifyContext(MixerContext);
if (Status != MM_STATUS_SUCCESS)
{
/* invalid context passed */
return Status;
}
/* grab mixer list */
MixerList = (PMIXER_LIST)MixerContext->MixerContext;
return MixerList->WaveOutListCount;
}
MIXER_STATUS
MMixerSetWaveStatus(
IN PMIXER_CONTEXT MixerContext,
IN HANDLE PinHandle,
IN KSSTATE State)
{
KSPROPERTY Property;
ULONG Length;
MIXER_STATUS Status;
/* verify mixer context */
Status = MMixerVerifyContext(MixerContext);
if (Status != MM_STATUS_SUCCESS)
{
/* invalid context passed */
return Status;
}
/* setup property request */
Property.Set = KSPROPSETID_Connection;
Property.Id = KSPROPERTY_CONNECTION_STATE;
Property.Flags = KSPROPERTY_TYPE_SET;
return MixerContext->Control(PinHandle, IOCTL_KS_PROPERTY, &Property, sizeof(KSPROPERTY), &State, sizeof(KSSTATE), &Length);
}
MIXER_STATUS
MMixerSetWaveResetState(
IN PMIXER_CONTEXT MixerContext,
IN HANDLE PinHandle,
IN ULONG bBegin)
{
ULONG Length;
MIXER_STATUS Status;
KSRESET Reset;
/* verify mixer context */
Status = MMixerVerifyContext(MixerContext);
if (Status != MM_STATUS_SUCCESS)
{
/* invalid context passed */
return Status;
}
/* begin / stop reset */
Reset = (bBegin ? KSRESET_BEGIN : KSRESET_END);
return MixerContext->Control(PinHandle, IOCTL_KS_RESET_STATE, &Reset, sizeof(KSRESET), NULL, 0, &Length);
}
MIXER_STATUS
MMixerGetWaveDevicePath(
IN PMIXER_CONTEXT MixerContext,
IN ULONG bWaveIn,
IN ULONG DeviceId,
OUT LPWSTR * DevicePath)
{
PMIXER_LIST MixerList;
LPMIXER_DATA MixerData;
LPWAVE_INFO WaveInfo;
SIZE_T Length;
MIXER_STATUS Status;
/* verify mixer context */
Status = MMixerVerifyContext(MixerContext);
if (Status != MM_STATUS_SUCCESS)
{
/* invalid context passed */
return Status;
}
/* grab mixer list */
MixerList = (PMIXER_LIST)MixerContext->MixerContext;
/* find destination wave */
Status = MMixerGetWaveInfoByIndexAndType(MixerList, DeviceId, bWaveIn, &WaveInfo);
if (Status != MM_STATUS_SUCCESS)
{
/* failed to find wave info */
return MM_STATUS_INVALID_PARAMETER;
}
/* get associated device id */
MixerData = MMixerGetDataByDeviceId(MixerList, WaveInfo->DeviceId);
if (!MixerData)
return MM_STATUS_INVALID_PARAMETER;
/* calculate length */
Length = wcslen(MixerData->DeviceName)+1;
/* allocate destination buffer */
*DevicePath = MixerContext->Alloc(Length * sizeof(WCHAR));
if (!*DevicePath)
{
/* no memory */
return MM_STATUS_NO_MEMORY;
}
/* copy device path */
MixerContext->Copy(*DevicePath, MixerData->DeviceName, Length * sizeof(WCHAR));
/* done */
return MM_STATUS_SUCCESS;
}
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