private static void DecodeAudio(string filename)
{
FFmpegReader reader = new FFmpegReader(filename, Type.Audio);
Console.WriteLine("length {0}, frame_size {1}, sample_rate {2}, sample_size {3}, channels {4}",
reader.AudioOutputConfig.length,
reader.AudioOutputConfig.frame_size,
reader.AudioOutputConfig.format.sample_rate,
reader.AudioOutputConfig.format.sample_size,
reader.AudioOutputConfig.format.channels);
int sampleBlockSize = reader.AudioOutputConfig.format.channels * reader.AudioOutputConfig.format.sample_size;
int output_buffer_size = reader.AudioOutputConfig.frame_size *
reader.AudioOutputConfig.format.channels * reader.AudioOutputConfig.format.sample_size;
byte[] output_buffer = new byte[output_buffer_size];
int samplesRead;
long timestamp;
Type type;
MemoryStream ms = new MemoryStream();
// read full stream
while ((samplesRead = reader.ReadFrame(out timestamp, output_buffer, output_buffer_size, out type)) > 0)
{
Console.WriteLine("read " + samplesRead + " @ " + timestamp);
// read samples into memory
int bytesRead = samplesRead * sampleBlockSize;
ms.Write(output_buffer, 0, bytesRead);
}
// seek back to start
reader.Seek(0, Type.Audio);
// read again (output should be the same as above)
while ((samplesRead = reader.ReadFrame(out timestamp, output_buffer, output_buffer_size, out type)) > 0)
{
Console.WriteLine("read " + samplesRead + " @ " + timestamp);
}
reader.Dispose();
// write memory to wav file
ms.Position = 0;
MemorySourceStream mss = new MemorySourceStream(ms, new AudioProperties(
reader.AudioOutputConfig.format.channels,
reader.AudioOutputConfig.format.sample_rate,
reader.AudioOutputConfig.format.sample_size * 8,
reader.AudioOutputConfig.format.sample_size == 4 ? AudioFormat.IEEE : AudioFormat.LPCM));
IeeeStream ieee = new IeeeStream(mss);
NAudioSinkStream nAudioSink = new NAudioSinkStream(ieee);
WaveFileWriter.CreateWaveFile(filename + ".ffmpeg.wav", nAudioSink);
}
private void SaveToFile(IAudioStream fileOutputStream, System.IO.FileInfo outputFile, IProgressReporter progressReporter)
{
Pause(); // playback and saving cannot happen in parallel
Stopwatch sw = new Stopwatch();
sw.Start();
// save current position for later
var currentTime = CurrentTime;
// disable reporting to consumers (e.g. GUI)
audioVolumeMeteringStream.Disabled = dataMonitorStream.Disabled = true;
// set to start for all audio to be saved
fileOutputStream.Position = 0;
NAudioSinkStream nAudioSink = new NAudioSinkStream(fileOutputStream);
long total = nAudioSink.Length;
long progress = 0;
using (WaveFileWriter writer = new WaveFileWriter(outputFile.FullName, nAudioSink.WaveFormat)) {
byte[] buffer = new byte[nAudioSink.WaveFormat.AverageBytesPerSecond * 5];
while (true)
{
int bytesRead = nAudioSink.Read(buffer, 0, buffer.Length);
progress += bytesRead;
if (bytesRead == 0)
{
// end of stream reached
break;
}
writer.Write(buffer, 0, bytesRead);
if (progressReporter != null)
{
progressReporter.ReportProgress((double)progress / total * 100);
}
}
}
// reenable reporting to consumers
audioVolumeMeteringStream.Disabled = dataMonitorStream.Disabled = false;
// reset initial position
CurrentTime = currentTime;
sw.Stop();
Console.WriteLine("Export time: " + sw.Elapsed);
}
private void Window_Loaded(object sender, RoutedEventArgs e)
{
audioOutput = new WasapiOut(global::NAudio.CoreAudioApi.AudioClientShareMode.Shared, true, 10);
mixer = new MixerStream(2, 44100);
MonoStream mono = new MonoStream(mixer);
Streams.ResamplingStream resampler = new Streams.ResamplingStream(mono, ResamplingQuality.VariableRate, 44100);
NAudioSinkStream naudioSink = new NAudioSinkStream(resampler);
audioOutput.Init(naudioSink);
mixingSampleRateLabel.Content = mixer.Properties.SampleRate;
playbackSampleRateLabel.Content = audioOutput.OutputWaveFormat.SampleRate;
sliderSampleRate.ValueChanged += new RoutedPropertyChangedEventHandler <double>(delegate(object s2, RoutedPropertyChangedEventArgs <double> e2) {
if (resampler.CheckTargetSampleRate(sliderSampleRate.Value))
{
resampler.TargetSampleRate = sliderSampleRate.Value;
}
});
}
private void button1_Click(object sender, RoutedEventArgs e)
{
Microsoft.Win32.OpenFileDialog dlg = new Microsoft.Win32.OpenFileDialog();
dlg.DefaultExt = ".wav";
dlg.Filter = "Wave files|*.wav";
if (dlg.ShowDialog() == true)
{
WaveFileReader reader = new WaveFileReader(dlg.FileName);
NAudioSourceStream nAudioSource = new NAudioSourceStream(reader);
IeeeStream ieee = new IeeeStream(nAudioSource);
MonoStream mono = new MonoStream(ieee);
ResamplingStream res = new ResamplingStream(mono, ResamplingQuality.Medium, 22050);
NAudioSinkStream nAudioSink = new NAudioSinkStream(res);
WaveFileWriter.CreateWaveFile(dlg.FileName + ".processed.wav", nAudioSink);
}
}
