public static void SetFormat(ref AMMediaType mt, ref WaveFormatEx wfx)
{
if (wfx != null)
{
int cb = Marshal.SizeOf(wfx);
IntPtr _ptr = Marshal.AllocCoTaskMem(cb);
try
{
Marshal.StructureToPtr(wfx, _ptr, true);
SetFormat(ref mt, _ptr, cb);
if (mt != null)
{
mt.formatType = FormatType.WaveEx;
}
}
finally
{
Marshal.FreeCoTaskMem(_ptr);
}
}
}
public void SetFormat(WaveFormatEx wfx)
{
if (wfx != null)
{
int cb = Marshal.SizeOf(wfx);
IntPtr _ptr = Marshal.AllocCoTaskMem(cb);
try
{
Marshal.StructureToPtr(wfx, _ptr, true);
SetFormat(_ptr, cb);
formatType = FormatType.WaveEx;
}
finally
{
Marshal.FreeCoTaskMem(_ptr);
}
}
}
public WaveFormatExtensible()
{
Format = new WaveFormatEx();
}
public static AMMediaType E_AC3(InputstreamInfo streamInfo)
{
WaveFormatEx wf = new WaveFormatEx();
wf.wFormatTag = 8192;
wf.nBlockAlign = 24;
wf.wBitsPerSample = 32;
wf.cbSize = 0;
AMMediaType amt = new AMMediaType();
AssignStreamInfoFields(streamInfo, ref wf, ref amt);
amt.majorType = MediaType.Audio;
amt.subType = MEDIASUBTYPE_DOLBY_DDPLUS;
amt.temporalCompression = false;
amt.fixedSizeSamples = true;
amt.SetFormat(wf);
return amt;
}
public static AMMediaType AAC_LC(InputstreamInfo streamInfo)
{
WaveFormatEx wf = new WaveFormatEx();
wf.wFormatTag = 255;
wf.nBlockAlign = 1;
wf.wBitsPerSample = 16;
wf.cbSize = 0;
AMMediaType amt = new AMMediaType();
AssignStreamInfoFields(streamInfo, ref wf, ref amt);
amt.majorType = MediaType.Audio;
amt.subType = MEDIASUBTYPE_ADTS; // Works better than RAW_AAC1 (tested with Amazon Prime and 7TV)
amt.temporalCompression = false;
amt.fixedSizeSamples = true;
amt.SetFormat(wf);
return amt;
}
private static void AssignStreamInfoFields(InputstreamInfo streamInfo, ref WaveFormatEx wf, ref AMMediaType amt)
{
wf.nChannels = (ushort)streamInfo.Channels;
wf.nSamplesPerSec = (int)streamInfo.SampleRate;
if (wf.nSamplesPerSec == 0)
wf.nSamplesPerSec = 48000; // Fallback if missing, otherwise audio decoder filter will not connect
wf.nAvgBytesPerSec = streamInfo.Bandwidth / 8;
amt.sampleSize = streamInfo.Bandwidth;
}
