I have an audio device (a USB microphone) and I want to find out what audio formats it supports natively (bit depth & sample rate), on OS X there is a nice kAudioStreamPropertyAvailablePhysicalFormats Core Audio property, but I fail to find something similar on Windows.
I know there is this question Windows Core Audio Api get all supported formats on capture device but
The answer is bad... and I'm not limited with windows Core Audio APIs, I need any way.
Windows itself somehow knows it, so most likely there should be a way, via IOCTL for example, DirectShow or WMI or something else.
Probably there is a way to Spy on Windows to find out what it uses to enumerate the formats, but I don't know how to do this.
Hokay, here is some sample code for you. The information is out there, scattered around the web, but you have to search for it. Google the functions I call below and some of the weirdo manifest constants to learn more. Code written in Notepad, might not compile.
The code below queries the default input / output device. To get device_id's for all the devices installed on any particular system, call waveInGetNumDevs
or waveOutGetNumDevs
and count up from 0.
#define INITGUID
#include "Ks.h"
#include "KsMedia.h"
#include "mmdeviceapi.h"
// Open a query handle for the default input or output device
// Call Closehandle when done.
static HANDLE QueryOpen (bool input)
{
DWORD device_id, device_status;
DWORD err = (input) ?
waveInMessage ((HWAVEIN) (INT_PTR) WAVE_MAPPER,
DRVM_MAPPER_PREFERRED_GET, (DWORD_PTR) &device_id, (DWORD_PTR) &device_status) :
waveOutMessage ((HWAVEOUT) (INT_PTR) WAVE_MAPPER,
DRVM_MAPPER_PREFERRED_GET, (DWORD_PTR) &device_id, (DWORD_PTR) &device_status);
if (err)
return INVALID_HANDLE_VALUE;
DWORD devicePathSize;
DWORD mm_result = (input) ?
waveInMessage ((HWAVEIN) (INT_PTR) device_id, DRV_QUERYDEVICEINTERFACESIZE,
(DWORD_PTR) &devicePathSize, 0) :
waveOutMessage ((HWAVEOUT) (INT_PTR) device_id, DRV_QUERYDEVICEINTERFACESIZE,
(DWORD_PTR) &devicePathSize, 0);
if (mm_result != 0)
return INVALID_HANDLE_VALUE;
/* apparently DRV_QUERYDEVICEINTERFACE returns a unicode interface path, although this is undocumented */
WCHAR *devicePath = (WCHAR *) malloc (devicePathSize);
mm_result = (input) ?
waveInMessage ((HWAVEIN) (INT_PTR) device_id, DRV_QUERYDEVICEINTERFACE,
(DWORD_PTR) devicePath, devicePathSize) :
waveOutMessage ((HWAVEOUT) (INT_PTR) device_id, DRV_QUERYDEVICEINTERFACE,
(DWORD_PTR) devicePath, devicePathSize);
HANDLE result = (mm_result == 0) ? CreateFileW (devicePath, FILE_SHARE_READ | FILE_SHARE_WRITE,
0, NULL, OPEN_EXISTING, 0, NULL) : INVALID_HANDLE_VALUE;
free (devicePath);
return result;
}
// Interrogate the default input / output device (demo code)
void InterrogateDefaultDevice (bool input)
{
HANDLE hQuery = QueryOpen (input);
if (hQuery == INVALID_HANDLE_VALUE)
return;
int pin_count = GetKSFilterPinCount (hQuery);
for (int pinId = 0; pinId < pin_count; ++pinId)
{
KSPIN_COMMUNICATION communication = GetKSFilterPinPropertyCommunication (hQuery, pinId);
KSPIN_DATAFLOW dataflow = GetKSFilterPinPropertyDataflow (h, pinId);
if ((communication == KSPIN_COMMUNICATION_SINK || communication == KSPIN_COMMUNICATION_BOTH) &&
(KSFilterPinPropertyIdentifiersInclude (hQuery, pinId, KSPROPERTY_PIN_INTERFACES,
&KSINTERFACESETID_Standard, KSINTERFACE_STANDARD_STREAMING) ||
KSFilterPinPropertyIdentifiersInclude (hQuery, pinId, KSPROPERTY_PIN_INTERFACES,
&KSINTERFACESETID_Standard, KSINTERFACE_STANDARD_LOOPED_STREAMING)) &&
KSFilterPinPropertyIdentifiersInclude (hQuery, pinId, KSPROPERTY_PIN_MEDIUMS,
&KSMEDIUMSETID_Standard, KSMEDIUM_STANDARD_DEVIO))
{
KSMULTIPLE_ITEM *item = NULL;
if (WdmGetPinPropertyMulti (hQuery, pinId, KSPROPERTY_PIN_DATARANGES, &item))
{
KSDATARANGE_AUDIO *dr = (KSDATARANGE_AUDIO *) (item + 1);
for (ULONG i = 0; i < item->Count; ++i )
{
printf ("%ul - %ul Hz (%ul - %ul bits per sample, upto %ul channels)\n",
dr->MinimumSampleFrequency, dr->MaximumSampleFrequency,
dr->MinimumBitsPerSample, dr->MaximumBitsPerSample, dr->MaximumChannels);
dr = (KSDATARANGE_AUDIO *) ((BYTE *) dr + dr->DataRange.FormatSize);
}
free (item);
}
}
}
CloseHandle (hQuery);
}
来源:https://stackoverflow.com/questions/50396224/how-to-get-audio-formats-supported-by-physical-device-winapi-windows