private void PerformEncode(IMFSinkWriter writer, int streamIndex, IWaveProvider inputProvider)
{
int maxLength = inputProvider.WaveFormat.AverageBytesPerSecond*4;
var managedBuffer = new byte[maxLength];
writer.BeginWriting();
long position = 0;
long duration = 0;
do
{
duration = ConvertOneBuffer(writer, streamIndex, inputProvider, position, managedBuffer);
position += duration;
} while (duration > 0);
//We are going to check the stats of the writer and ensure no more bytes are queued before we call DoFinalize()
MF_SINK_WRITER_STATISTICS stats = new MF_SINK_WRITER_STATISTICS();
stats.cb = Marshal.SizeOf(stats);
bool finished = false;
const int sleepMs = 10;
const int maxTimeInSeconds = 5;
const int maxTries = (maxTimeInSeconds*1000)/sleepMs;
var tries = 0;
try
{
while (!finished)
{
writer.GetStatistics(streamIndex, stats);
if (tries == maxTries)
{
var msg =
string.Format(
"Unable to save the MP3 file. Sink writer still has {0} bytes in the queue after waiting for {1} seconds.",
stats.dwByteCountQueued,
maxTimeInSeconds);
throw new Exception(msg);
}
if (stats.dwByteCountQueued == 0)
{
finished = true;
}
else
{
//sleeping could be optional, but don't want to hog the CPU
System.Threading.Thread.Sleep(sleepMs);
}
tries++;
}
}
finally
{
writer.DoFinalize();
}
}