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a06847ca335dcf248713169461185c456cb986df
mpg123/src/libout123/modules/win32_wasapi.c
Ozkan Sezer a06847ca33 mpg123-1.32.4
2024-01-10 20:40:40 +03:00

621 lines
22 KiB
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/*
win32_wasapi: audio output for Windows wasapi exclusive mode audio
copyright ?-2013 by the mpg123 project - free software under the terms of the LGPL 2.1
see COPYING and AUTHORS files in distribution or http://mpg123.org
based on win32.c
*/
#if defined(_WIN32_WINNT)
# if _WIN32_WINNT < 0x0601
# error "wrong _WIN32_WINNT value"
# endif
#else
# define _WIN32_WINNT 0x0601
#endif
#define COBJMACROS 1
#include "../out123_int.h"
#include <inttypes.h>
#include <initguid.h>
#include <audioclient.h>
#include <mmdeviceapi.h>
#include <avrt.h>
#include <functiondiscoverykeys_devpkey.h>
#include "../../common/debug.h"
#ifdef _MSC_VER
/* When compiling C code with MSVC it is only possible to declare, but not
define the WASAPI interface GUIDs using MS headers. So we define them
ourselves. */
#ifndef GUID_SECT
#define GUID_SECT
#endif
#define __DEFINE_GUID(n,l,w1,w2,b1,b2,b3,b4,b5,b6,b7,b8) static const GUID n GUID_SECT = {l,w1,w2,{b1,b2,b3,b4,b5,b6,b7,b8}}
#define __DEFINE_IID(n,l,w1,w2,b1,b2,b3,b4,b5,b6,b7,b8) static const IID n GUID_SECT = {l,w1,w2,{b1,b2,b3,b4,b5,b6,b7,b8}}
#define __DEFINE_CLSID(n,l,w1,w2,b1,b2,b3,b4,b5,b6,b7,b8) static const CLSID n GUID_SECT = {l,w1,w2,{b1,b2,b3,b4,b5,b6,b7,b8}}
#define __DEFINE_PROPERTYKEY(n,l,w1,w2,b1,b2,b3,b4,b5,b6,b7,b8,pid) static const PROPERTYKEY n GUID_SECT = {{l,w1,w2,{b1,b2,b3,b4,b5,b6,b7,b8}},pid}
#define MPG123_DEFINE_CLSID(className, l, w1, w2, b1, b2, b3, b4, b5, b6, b7, b8) \
__DEFINE_CLSID(mpg123_CLSID_##className, 0x##l, 0x##w1, 0x##w2, 0x##b1, 0x##b2, 0x##b3, 0x##b4, 0x##b5, 0x##b6, 0x##b7, 0x##b8)
#define MPG123_DEFINE_IID(interfaceName, l, w1, w2, b1, b2, b3, b4, b5, b6, b7, b8) \
__DEFINE_IID(mpg123_IID_##interfaceName, 0x##l, 0x##w1, 0x##w2, 0x##b1, 0x##b2, 0x##b3, 0x##b4, 0x##b5, 0x##b6, 0x##b7, 0x##b8)
#define MPG123_DEFINE_PROPERTYKEY(interfaceName, l, w1, w2, b1, b2, b3, b4, b5, b6, b7, b8, pid) \
__DEFINE_PROPERTYKEY(mpg123_PKEY_##interfaceName, 0x##l, 0x##w1, 0x##w2, 0x##b1, 0x##b2, 0x##b3, 0x##b4, 0x##b5, 0x##b6, 0x##b7, 0x##b8, pid)
// "1CB9AD4C-DBFA-4c32-B178-C2F568A703B2"
MPG123_DEFINE_IID(IAudioClient, 1cb9ad4c, dbfa, 4c32, b1, 78, c2, f5, 68, a7, 03, b2);
// "A95664D2-9614-4F35-A746-DE8DB63617E6"
MPG123_DEFINE_IID(IMMDeviceEnumerator, a95664d2, 9614, 4f35, a7, 46, de, 8d, b6, 36, 17, e6);
// "BCDE0395-E52F-467C-8E3D-C4579291692E"
MPG123_DEFINE_CLSID(IMMDeviceEnumerator, bcde0395, e52f, 467c, 8e, 3d, c4, 57, 92, 91, 69, 2e);
// "F294ACFC-3146-4483-A7BF-ADDCA7C260E2"
MPG123_DEFINE_IID(IAudioRenderClient, f294acfc, 3146, 4483, a7, bf, ad, dc, a7, c2, 60, e2);
MPG123_DEFINE_PROPERTYKEY(Device_FriendlyName, a45c254e, df1c, 4efd, 80, 20, 67, d1, 46, a8, 50, e0, 14);
#else
#define mpg123_IID_IAudioClient IID_IAudioClient
#define mpg123_IID_IMMDeviceEnumerator IID_IMMDeviceEnumerator
#define mpg123_CLSID_IMMDeviceEnumerator CLSID_MMDeviceEnumerator
#define mpg123_IID_IAudioRenderClient IID_IAudioRenderClient
#define mpg123_PKEY_Device_FriendlyName PKEY_Device_FriendlyName
#endif
/* Push mode does not work right yet, noisy audio, probably something to do with timing and buffers */
#define MOD_STRING "Experimental Audio output for Windows"
#define BUFFER_TIME 20000000.0
static int init_win32(out123_handle* ao);
static void flush_win32(out123_handle *ao);
/*
Module information data structure
*/
mpg123_module_t mpg123_output_module_info = {
/* api_version */ MPG123_MODULE_API_VERSION,
/* name */ "win32_wasapi",
/* description */ MOD_STRING,
/* revision */ "$Rev:$",
/* handle */ NULL,
/* init_output */ init_win32,
};
// REFERENCE_TIME time units per second and per millisecond
#define REFTIMES_PER_SEC 10000000
#define REFTIMES_PER_MILLISEC 10000
#define EXIT_ON_ERROR(hres) \
if (FAILED(hres)) { goto Exit; }
/* todo: move into handle struct */
typedef struct _wasapi_state_struct {
IMMDeviceEnumerator *pEnumerator;
IMMDevice *pDevice;
IAudioClient *pAudioClient;
IAudioRenderClient *pRenderClient;
BYTE *pData;
UINT32 bufferFrameCount, numFramesAvailable;
REFERENCE_TIME hnsRequestedDuration;
HANDLE hEvent;
HANDLE hTask;
size_t pData_off;
DWORD taskIndex;
char is_playing;
DWORD framesize;
DWORD renderMode;
char is_EventMode;
} wasapi_state_struct;
/* setup endpoints */
static int open_win32(out123_handle *ao){
HRESULT hr = 0;
wchar_t *device = NULL;
int devlen;
wasapi_state_struct *state;
debug1("%s",__FUNCTION__);
if(!ao || ao->userptr) return -1; /* userptr should really be null */
state = calloc(sizeof(*state),1);
if(!state) return -1;
state->hnsRequestedDuration = REFTIMES_PER_SEC;
ao->userptr = (void *)state;
state->renderMode = AUDCLNT_SHAREMODE_SHARED;
state->is_EventMode = 1;
hr = CoCreateInstance(&mpg123_CLSID_IMMDeviceEnumerator,NULL,CLSCTX_ALL, &mpg123_IID_IMMDeviceEnumerator,(void**)&state->pEnumerator);
mdebug("CoCreateInstance %x", hr);
EXIT_ON_ERROR(hr)
if (ao->device) {
devlen = INT123_win32_utf8_wide(ao->device, &device, NULL);
if(device && devlen > 0) {
hr = IMMDeviceEnumerator_GetDevice(state->pEnumerator, device, &state->pDevice);
mdebug("IMMDeviceEnumerator_GetDevice %x", hr);
free(device);
} else {
debug("IMMDeviceEnumerator_GetDevice convert fail");
return -1;
}
} else {
hr = IMMDeviceEnumerator_GetDefaultAudioEndpoint(state->pEnumerator,eRender, eConsole, &state->pDevice);
mdebug("IMMDeviceEnumerator_GetDefaultAudioEndpoint %x", hr);
}
EXIT_ON_ERROR(hr)
hr = IMMDeviceActivator_Activate(state->pDevice,
&mpg123_IID_IAudioClient, CLSCTX_ALL,
NULL, (void**)&state->pAudioClient);
debug("IMMDeviceActivator_Activate");
EXIT_ON_ERROR(hr)
return 0;
Exit:
mdebug("%s failed with %lx", __FUNCTION__, hr);
return 1;
}
static int formats_generator(const out123_handle * const ao, const int waveformat, WAVEFORMATEX *const format){
DWORD bytes_per_sample = 0;
WORD tag = WAVE_FORMAT_PCM;
mdebug("%s",__FUNCTION__);
int ret = waveformat;
switch(waveformat){
case MPG123_ENC_ULAW_8:
tag = WAVE_FORMAT_MULAW;
bytes_per_sample = 1;
break;
case MPG123_ENC_ALAW_8:
tag = WAVE_FORMAT_ALAW;
bytes_per_sample = 1;
break;
case MPG123_ENC_SIGNED_8:
bytes_per_sample = 1;
break;
case MPG123_ENC_FLOAT_32:
tag = WAVE_FORMAT_IEEE_FLOAT;
bytes_per_sample = 4;
case MPG123_ENC_SIGNED_32:
bytes_per_sample = 4;
break;
case MPG123_ENC_SIGNED_16:
bytes_per_sample = 2;
break;
case MPG123_ENC_SIGNED_24:
bytes_per_sample = 3;
break;
default:
mdebug("uh oh unknown %x",waveformat);
ret = 0;
break;
}
format->wFormatTag = tag;
format->nChannels = ao->channels;
format->nSamplesPerSec = ao->rate;
format->nAvgBytesPerSec = ao->channels * bytes_per_sample * ao->rate;
format->nBlockAlign = ao->channels * bytes_per_sample;
format->wBitsPerSample = bytes_per_sample * 8;
format->cbSize = 0;
return ret;
}
/* check supported formats */
typedef struct {
unsigned int format;
const char *name;
} tknown_formats;
static const tknown_formats known_formats[] = {
{ .format = MPG123_ENC_SIGNED_8, .name = "MPG123_ENC_SIGNED_8" },
{ .format = MPG123_ENC_SIGNED_16, .name = "MPG123_ENC_SIGNED_16" },
{ .format = MPG123_ENC_SIGNED_24, .name = "MPG123_ENC_SIGNED_24" },
{ .format = MPG123_ENC_SIGNED_32, .name = "MPG123_ENC_SIGNED_32" },
{ .format = MPG123_ENC_FLOAT_32, .name = "MPG123_ENC_FLOAT_16" },
{ .format = MPG123_ENC_ALAW_8, .name = "MPG123_ENC_ALAW_8" },
{ .format = MPG123_ENC_ULAW_8, .name = "MPG123_ENC_ULAW_8" },
{ .format = 0, .name = NULL }
};
static int get_formats_win32(out123_handle *ao){
/* PLEASE check with write_init and write_win32 buffer size calculation in case it is able to support something other than 16bit */
HRESULT hr;
WAVEFORMATEX wf, *pClosestMatch = NULL;
int ret = 0, i;
mdebug("%s",__FUNCTION__);
if(!ao || !ao->userptr) return -1;
wasapi_state_struct *state = (wasapi_state_struct *) ao->userptr;
mdebug("format %lx, channels %d, rate %ld",ao->format, ao->channels, ao->rate);
for(i = 0; known_formats[i].name; i++) {
if(ao->format & known_formats[i].format) {
formats_generator(ao, known_formats[i].format, &wf);
if((hr = IAudioClient_IsFormatSupported(state->pAudioClient, state->renderMode, &wf, &pClosestMatch)) == S_OK) {
mdebug("OK format %s rate %ld supported", known_formats[i].name, ao->rate);
ret |= known_formats[i].format;
} else {
if(hr & AUDCLNT_E_UNSUPPORTED_FORMAT) debug2("format %s rate %ld not supported", known_formats[i].name, ao->rate);
if(pClosestMatch) {
mdebug("Suggested: wFormatTag %x", pClosestMatch->wFormatTag);
mdebug("Suggested: nChannels %u", pClosestMatch->nChannels);
mdebug("Suggested: nSamplesPerSec %lu", pClosestMatch->nSamplesPerSec);
mdebug("Suggested: nAvgBytesPerSec %lu", pClosestMatch->nAvgBytesPerSec);
mdebug("Suggested: nBlockAlign %u", pClosestMatch->nBlockAlign);
mdebug("Suggested: wBitsPerSample %u", pClosestMatch->wBitsPerSample);
mdebug("Suggested: cbSize %u", pClosestMatch->cbSize);
}
}
if(pClosestMatch) CoTaskMemFree(pClosestMatch);
pClosestMatch = NULL;
}
}
mdebug("supported format %lx, channels %d, rate %ld",ret, ao->channels, ao->rate);
return ret; /* afaik only 16bit 44.1kHz/48kHz has been known to work */
}
/* setup with agreed on format, for now only MPG123_ENC_SIGNED_16 */
static int write_init(out123_handle *ao){
HRESULT hr;
double offset = 0.5;
mdebug("%s",__FUNCTION__);
if(!ao || !ao->userptr) return -1;
wasapi_state_struct *state = (wasapi_state_struct *) ao->userptr;
WAVEFORMATEX s16;
formats_generator(ao,ao->format,&s16);
state->framesize = s16.nBlockAlign;
mdebug("block size %ld", state->framesize);
/* cargo cult code */
hr = IAudioClient_GetDevicePeriod(state->pAudioClient,NULL, &state->hnsRequestedDuration);
mdebug("IAudioClient_GetDevicePeriod %x", hr);
reinit:
hr = IAudioClient_Initialize(state->pAudioClient,
state->renderMode,
state->is_EventMode ? AUDCLNT_STREAMFLAGS_EVENTCALLBACK : 0,
state->hnsRequestedDuration,
state->renderMode == AUDCLNT_SHAREMODE_EXCLUSIVE ? state->hnsRequestedDuration : 0,
&s16,
NULL);
mdebug("IAudioClient_Initialize %x", hr);
if(hr == AUDCLNT_E_DEVICE_IN_USE){
debug("AUDCLNT_SHAREMODE_EXCLUSIVE not possible, another application is using IAudioClient");
}
/* something about buffer sizes on Win7, fixme might loop forever */
if (hr == AUDCLNT_E_BUFFER_SIZE_NOT_ALIGNED){
if (offset > 10.0) goto Exit; /* is 10 enough to break out of the loop?*/
debug("AUDCLNT_E_BUFFER_SIZE_NOT_ALIGNED");
IAudioClient_GetBufferSize(state->pAudioClient,&state->bufferFrameCount);
/* double buffered */
state->hnsRequestedDuration = (REFERENCE_TIME)((BUFFER_TIME / s16.nSamplesPerSec * state->bufferFrameCount) + offset);
offset += 0.5;
IAudioClient_Release(state->pAudioClient);
state->pAudioClient = NULL;
hr = IMMDeviceActivator_Activate(state->pDevice,
&mpg123_IID_IAudioClient, CLSCTX_ALL,
NULL, (void**)&state->pAudioClient);
mdebug("IMMDeviceActivator_Activate %x", hr);
goto reinit;
}
EXIT_ON_ERROR(hr)
hr = IAudioClient_GetService(state->pAudioClient,
&mpg123_IID_IAudioRenderClient,
(void**)&state->pRenderClient);
mdebug("IAudioClient_GetService %x", hr);
EXIT_ON_ERROR(hr)
if (state->is_EventMode) {
state->hEvent = CreateEvent(NULL, FALSE, FALSE, NULL);
mdebug("CreateEvent %p", state->hEvent);
if(!state->hEvent) goto Exit;
hr = IAudioClient_SetEventHandle(state->pAudioClient,state->hEvent);
mdebug("IAudioClient_SetEventHandle %x", hr);
EXIT_ON_ERROR(hr);
}
hr = IAudioClient_GetBufferSize(state->pAudioClient,&state->bufferFrameCount);
mdebug("IAudioClient_GetBufferSize %x", hr);
EXIT_ON_ERROR(hr)
return 0;
Exit:
mdebug("%s failed with %lx", __FUNCTION__, hr);
return 1;
}
/* Set play mode if unset, also raise thread priority */
static HRESULT play_init(out123_handle *ao){
HRESULT hr = S_OK;
if(!ao || !ao->userptr) return -1;
wasapi_state_struct *state = (wasapi_state_struct *) ao->userptr;
if(!state->is_playing){
mdebug("%s",__FUNCTION__);
state->hTask = AvSetMmThreadCharacteristicsW(L"Pro Audio", &state->taskIndex);
hr = IAudioClient_Start(state->pAudioClient);
mdebug("IAudioClient_Start %x", hr);
EXIT_ON_ERROR(hr)
state->is_playing = 1;
}
return hr;
Exit:
mdebug("%s failed with %lx", __FUNCTION__, hr);
return hr;
}
/* copy audio into IAudioRenderClient provided buffer */
static int write_win32(out123_handle *ao, unsigned char *buf, int len){
HRESULT hr;
UINT32 numFramesPadding = 0;
size_t to_copy = 0;
mdebug("%s",__FUNCTION__);
if(!ao || !ao->userptr) return -1;
wasapi_state_struct *state = (wasapi_state_struct *) ao->userptr;
if(!len) return 0;
if(!state->pRenderClient) write_init(ao);
size_t frames_in = len/state->framesize; /* Frames in buf, is framesize even correct? */
mdebug("%s mode entered", state->is_EventMode ? "Event" : "Push");
if(state->is_EventMode) {
/* Event mode WASAPI */
DWORD retval = -1;
int flag = 0; /* Silence flag */
feed_again_event:
if(!state->pData){
/* Acquire buffer */
hr = IAudioClient_GetCurrentPadding(state->pAudioClient,&numFramesPadding);
mdebug("IAudioClient_GetCurrentPadding %x", hr);
EXIT_ON_ERROR(hr)
state->numFramesAvailable = state->bufferFrameCount - numFramesPadding;
hr = IAudioRenderClient_GetBuffer(state->pRenderClient, state->numFramesAvailable, &state->pData);
mdebug("IAudioRenderClient_GetBuffer %lu %x", state->numFramesAvailable, hr);
EXIT_ON_ERROR(hr)
}
if(frames_in){ /* Did we get half a frame?? non-zero len smaller than framesize? */
/* We must put in exactly the amount of frames specified by IAudioRenderClient_GetBuffer */
mdebug("frames_in %"PRIu64", state->pData_off %u, numFramesAvailable %u", frames_in, state->pData_off, state->numFramesAvailable);
while(state->pData_off < state->numFramesAvailable){
to_copy = state->numFramesAvailable - state->pData_off;
mdebug("pData_off %"PRId64", numFramesAvailable %d, to_copy %"PRIu64, state->pData_off, state->numFramesAvailable, to_copy);
if(to_copy > frames_in){
/* buf can fit in provided buffer space */
mdebug("all buffers copied, %"PRIu64, frames_in);
memcpy(state->pData+state->pData_off*state->framesize,buf,state->framesize*(frames_in));
state->pData_off += frames_in;
frames_in = 0;
break;
} else {
/* buf too big, needs spliting */
mdebug("partial buffers %"PRIu64, to_copy);
memcpy(state->pData+state->pData_off*state->framesize,buf,state->framesize*(to_copy));
state->pData_off += to_copy;
buf+=(to_copy*state->framesize);
frames_in -= to_copy;
}
}
} else {
debug("AUDCLNT_BUFFERFLAGS_SILENT");
/* In case we ever get half a frame, is it possible? */
flag = AUDCLNT_BUFFERFLAGS_SILENT;
}
mdebug("Copied %"PRIu64", left %"PRIu64, state->pData_off, frames_in);
if(state->pData_off == state->numFramesAvailable) {
/* Tell IAudioRenderClient that buffer is filled and released */
hr = IAudioRenderClient_ReleaseBuffer(state->pRenderClient,state->pData_off, flag);
state->pData_off = 0;
state->pData = NULL;
debug("IAudioRenderClient_ReleaseBuffer");
EXIT_ON_ERROR(hr)
if(!state->is_playing){
hr = play_init(ao);
EXIT_ON_ERROR(hr)
}
/* wait for next pull event */
retval = WaitForSingleObject(state->hEvent, 2000);
if (retval != WAIT_OBJECT_0){
/* Event handle timed out after a 2-second wait, something went very wrong */
IAudioClient_Stop(state->pAudioClient);
hr = ERROR_TIMEOUT;
goto Exit;
}
}
if(frames_in > 0)
goto feed_again_event;
} else { /* PUSH mode code */
mdebug("block size %"PRIu64", %d len, %"PRIu64" number of frames", state->framesize, len, frames_in);
feed_again_push:
/* How much buffer do we get to use? */
hr = IAudioClient_GetBufferSize(state->pAudioClient,&state->bufferFrameCount);
mdebug("IAudioClient_GetBufferSize %x", hr);
EXIT_ON_ERROR(hr)
hr = IAudioClient_GetCurrentPadding(state->pAudioClient,&numFramesPadding);
mdebug("IAudioClient_GetCurrentPadding %x", hr);
EXIT_ON_ERROR(hr)
/* How much buffer is writable at the moment? */
state->numFramesAvailable = state->bufferFrameCount - numFramesPadding;
mdebug("numFramesAvailable %d, bufferFrameCount %d, numFramesPadding %d", state->numFramesAvailable, state->bufferFrameCount, numFramesPadding);
if(state->numFramesAvailable > frames_in){
/* can fit all frames now */
state->pData_off = 0;
to_copy = frames_in;
} else {
/* copy whatever that fits in the buffer */
state->pData_off = frames_in - state->numFramesAvailable;
to_copy = state->numFramesAvailable;
}
/* Acquire buffer */
hr = IAudioRenderClient_GetBuffer(state->pRenderClient, to_copy, &state->pData);
mdebug("IAudioRenderClient_GetBuffer %"PRIu64" frames", to_copy);
EXIT_ON_ERROR(hr)
/* Copy buffer */
memcpy(state->pData, buf + state->pData_off * state->framesize, to_copy * state->framesize);
/* Release buffer */
hr = IAudioRenderClient_ReleaseBuffer(state->pRenderClient, to_copy, 0);
mdebug("IAudioRenderClient_ReleaseBuffer %x", hr);
EXIT_ON_ERROR(hr)
if(!state->is_playing){
hr = play_init(ao);
EXIT_ON_ERROR(hr)
}
frames_in -= to_copy;
/* Wait sometime for buffer to empty? */
DWORD sleeptime = ((double)REFTIMES_PER_SEC) * to_copy / ao->rate / REFTIMES_PER_MILLISEC / 2;
mdebug("Sleeping %ld msec", sleeptime);
Sleep(sleeptime);
if (frames_in > 0)
goto feed_again_push;
}
return len;
Exit:
mdebug("%s failed with %lx", __FUNCTION__, hr);
return -1;
}
static void flush_win32(out123_handle *ao){
/* Wait for the last buffer to play before stopping. */
mdebug("%s",__FUNCTION__);
if(!ao || !ao->userptr) return;
wasapi_state_struct *state = (wasapi_state_struct *) ao->userptr;
HRESULT hr;
if(!state->pAudioClient) return;
state->pData = NULL;
hr = IAudioClient_Stop(state->pAudioClient);
EXIT_ON_ERROR(hr)
IAudioClient_Reset(state->pAudioClient);
EXIT_ON_ERROR(hr)
return;
Exit:
mdebug("%s IAudioClient_Stop with %lx", __FUNCTION__, hr);
}
static int close_win32(out123_handle *ao)
{
mdebug("%s",__FUNCTION__);
if(!ao || !ao->userptr) return -1;
wasapi_state_struct *state = (wasapi_state_struct *) ao->userptr;
if(state->is_EventMode && state->pData){
/* Play all in buffer before closing */
debug("Flushing remaining buffers");
IAudioRenderClient_ReleaseBuffer(state->pRenderClient,state->bufferFrameCount, 0);
WaitForSingleObject(state->hEvent, 2000);
state->pData = NULL;
}
if(state->pAudioClient) IAudioClient_Stop(state->pAudioClient);
if(state->pRenderClient) IAudioRenderClient_Release(state->pRenderClient);
if(state->pAudioClient) IAudioClient_Release(state->pAudioClient);
if(state->hTask) AvRevertMmThreadCharacteristics(state->hTask);
if(state->pEnumerator) IMMDeviceEnumerator_Release(state->pEnumerator);
if(state->pDevice) IMMDevice_Release(state->pDevice);
free(state);
ao->userptr = NULL;
return 0;
}
static int enumerate_win32( out123_handle *ao, int (*store_device)(void *devlist
, const char *name, const char *description), void *devlist )
{
char *pszID = NULL, *pszDesc = NULL;
HRESULT hr = S_OK;
UINT pcDevices = 0, i = 0;
LPWSTR pwszID = NULL;
IMMDeviceEnumerator *pEnumerator = NULL;
IMMDeviceCollection *pCollection = NULL;
IPropertyStore *pProps = NULL;
IMMDevice *pDevice = NULL;
PROPVARIANT varName;
hr = CoCreateInstance(&mpg123_CLSID_IMMDeviceEnumerator,NULL,CLSCTX_ALL, &mpg123_IID_IMMDeviceEnumerator,(void**)&pEnumerator);
if(FAILED(hr) || pEnumerator == NULL) goto Exit;
hr = IMMDeviceEnumerator_EnumAudioEndpoints(pEnumerator, eRender, DEVICE_STATE_ACTIVE, &pCollection);
if(FAILED(hr) || pCollection == NULL) goto Exit;
hr = IMMDeviceCollection_GetCount(pCollection, &pcDevices);
EXIT_ON_ERROR(hr)
for(i = 0; i < pcDevices; i++) {
/* init */
hr = IMMDeviceCollection_Item(pCollection, i, &pDevice);
if(FAILED(hr) || pDevice == NULL) goto Exit;
hr = IMMDevice_GetId(pDevice, &pwszID);
if(FAILED(hr) || pwszID == NULL) goto Exit;
hr = IMMDevice_OpenPropertyStore(pDevice, STGM_READ, &pProps);
if(FAILED(hr) || pProps == NULL) goto Exit;
/* get ID */
INT123_win32_wide_utf8(pwszID, &pszID, NULL);
if(pszID == NULL) goto Exit;
/* get Property */
PropVariantInit(&varName);
hr = IPropertyStore_GetValue(pProps, &mpg123_PKEY_Device_FriendlyName, &varName);
if(FAILED(hr)) {
PropVariantClear(&varName);
goto Exit;
}
/* get Description*/
INT123_win32_wide_utf8(varName.pwszVal, &pszDesc, NULL);
PropVariantClear(&varName);
if(pszDesc == NULL) goto Exit;
/* store */
if(store_device(devlist, pszID, pszDesc))
goto Exit;
/* release */
free(pszID);
pszID = NULL;
free(pszDesc);
pszDesc = NULL;
CoTaskMemFree(pwszID);
pwszID = NULL;
IMMDeviceEnumerator_Release(pDevice);
}
IMMDeviceCollection_Release(pCollection);
IMMDeviceEnumerator_Release(pEnumerator);
return 0;
Exit:
if(pszDesc) free(pszDesc);
if(pszID) free(pszID);
if(pwszID) CoTaskMemFree(pwszID);
if(pProps) IPropertyStore_Release(pProps);
if(pDevice) IMMDeviceEnumerator_Release(pDevice);
if(pCollection) IMMDeviceCollection_Release(pCollection);
if(pEnumerator) IMMDeviceEnumerator_Release(pEnumerator);
return -1;
}
static void deinit_win32(out123_handle* ao)
{
/* Deinitialize things from init_win32(). */
CoUninitialize();
}
static int init_win32(out123_handle* ao){
HRESULT hr;
mdebug("%s",__FUNCTION__);
if(!ao) return -1;
hr = CoInitializeEx(NULL, COINIT_MULTITHREADED);
mdebug("CoInitializeEx %x", hr);
if(!(hr == S_OK || hr == S_FALSE))
return -1;
/* Set callbacks */
ao->open = open_win32;
ao->flush = flush_win32;
ao->write = write_win32;
ao->get_formats = get_formats_win32;
ao->close = close_win32;
ao->userptr = NULL;
ao->enumerate = enumerate_win32;
ao->deinit = deinit_win32;
/* Success */
return 0;
}
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