Play Audio Stream Using Windows APIs in C++ - c++

Question

To play an .mp3 file in Windows using (in this case) DirectShow you only need:
#include <dshow.h>
#include <cstdio>
// For IID_IGraphBuilder, IID_IMediaControl, IID_IMediaEvent
#pragma comment(lib, "strmiids.lib")
const wchar_t* filePath = L"C:/Users/Public/Music/Sample Music/Sleep Away.mp3";
int main()
{
IGraphBuilder *pGraph = NULL;
IMediaControl *pControl = NULL;
IMediaEvent *pEvent = NULL;
// Initialize the COM library.
HRESULT hr = ::CoInitialize(NULL);
if (FAILED(hr))
{
::printf("ERROR - Could not initialize COM library");
return 0;
}
// Create the filter graph manager and query for interfaces.
hr = ::CoCreateInstance(CLSID_FilterGraph, NULL, CLSCTX_INPROC_SERVER,
IID_IGraphBuilder, (void **)&pGraph);
if (FAILED(hr))
{
::printf("ERROR - Could not create the Filter Graph Manager.");
return 0;
}
hr = pGraph->QueryInterface(IID_IMediaControl, (void **)&pControl);
hr = pGraph->QueryInterface(IID_IMediaEvent, (void **)&pEvent);
// Build the graph.
hr = pGraph->RenderFile(filePath, NULL);
if (SUCCEEDED(hr))
{
// Run the graph.
hr = pControl->Run();
if (SUCCEEDED(hr))
{
// Wait for completion.
long evCode;
pEvent->WaitForCompletion(INFINITE, &evCode);
// Note: Do not use INFINITE in a real application, because it
// can block indefinitely.
}
}
// Clean up in reverse order.
pEvent->Release();
pControl->Release();
pGraph->Release();
::CoUninitialize();
}
I can't find a way to have something like this, but to be able to play an .asx instead, like for example: http://listen.radiotunes.com/public5/solopiano.asx
In MSDN I can only find ways to do this in C# making a Forms application and inserting a WindowsMediaPlayer control in a form.
Any ideas?

Answer 1

An .asx file is actually a playlist. See here some information about the format.
.asx is not supported by DirectShow. See here for the supported formats.
You might parse the file, as it is XML, and find the actual URL of the stream, and then play it, or you could use the Windows Media Player SDK. You can see some sample code for WM SDK here.

Answer 2

OK, got it to work with this example taken from here and adding this extra line: hr = spPlayer->put_URL(L"http://listen.radiotunes.com/public5/solopiano.asx");:
#include "atlbase.h"
#include "atlwin.h"
#include "wmp.h"
#include <cstdio>
int _tmain(int argc, _TCHAR* argv[])
{
CoInitialize(NULL);
HRESULT hr = S_OK;
CComBSTR bstrVersionInfo; // Contains the version string.
CComPtr<IWMPPlayer> spPlayer; // Smart pointer to IWMPPlayer interface.
hr = spPlayer.CoCreateInstance(__uuidof(WindowsMediaPlayer), 0, CLSCTX_INPROC_SERVER);
if (SUCCEEDED(hr))
{
hr = spPlayer->get_versionInfo(&bstrVersionInfo);
hr = spPlayer->put_URL(L"http://listen.radiotunes.com/public5/solopiano.asx");
}
if (SUCCEEDED(hr))
{
// Show the version in a message box.
COLE2T pStr(bstrVersionInfo);
MessageBox(NULL, (LPCSTR)pStr, _T("Windows Media Player Version"), MB_OK);
}
// Clean up.
spPlayer.Release();
CoUninitialize();
return 0;
}