internal NativeExtendedAudioFile(AudioStreamBasicDescription description, AudioFileType fileType, Stream stream)
: base(description, fileType, stream)
{
Contract.Requires(stream != null);
Contract.Ensures(_handle != null);
Contract.Ensures(!_handle.IsClosed);
ExtendedAudioFileStatus status = SafeNativeMethods.ExtAudioFileWrapAudioFile(Handle, true, out _handle);
if (status != ExtendedAudioFileStatus.Ok)
{
throw new IOException(string.Format(CultureInfo.CurrentCulture,
Resources.NativeExtendedAudioFileInitializationError, status));
}
}
public void Initialize(Stream stream, AudioInfo audioInfo, MetadataDictionary metadata, SettingsDictionary settings)
{
Contract.Ensures(_stream != null);
Contract.Ensures(_stream == stream);
Contract.Ensures(_metadata != null);
Contract.Ensures(_metadata == metadata);
Contract.Ensures(_settings != null);
Contract.Ensures(_settings == settings);
Contract.Ensures(_audioFile != null);
_stream = stream;
_multiplier = (float)Math.Pow(2, audioInfo.BitsPerSample - 1);
_metadata = metadata;
_settings = settings;
AudioStreamBasicDescription inputDescription = GetInputDescription(audioInfo);
AudioStreamBasicDescription outputDescription = GetOutputDescription(inputDescription);
try
{
_audioFile = new NativeExtendedAudioFile(outputDescription, AudioFileType.M4A, stream);
ExtendedAudioFileStatus status = _audioFile.SetProperty(ExtendedAudioFilePropertyId.ClientDataFormat,
inputDescription);
if (status != ExtendedAudioFileStatus.Ok)
{
throw new IOException(string.Format(CultureInfo.CurrentCulture,
Resources.SampleEncoderInitializationError, status));
}
}
catch (TypeInitializationException e)
{
if (e.InnerException != null && e.InnerException.GetType() == typeof(ExtensionInitializationException))
{
throw e.InnerException;
}
throw;
}
}
public void Submit(SampleCollection samples)
{
Contract.Ensures(_buffer != null);
if (_buffer == null)
{
_buffer = new int[samples.SampleCount * samples.Channels];
}
if (!samples.IsLast)
{
var index = 0;
for (var sample = 0; sample < samples.SampleCount; sample++)
{
for (var channel = 0; channel < samples.Channels; channel++)
{
_buffer[index++] = (int)Math.Round(samples[channel][sample] * _multiplier);
}
}
GCHandle handle = GCHandle.Alloc(_buffer, GCHandleType.Pinned);
try
{
var bufferList = new AudioBufferList
{
NumberBuffers = 1,
Buffers = new AudioBuffer[1]
};
bufferList.Buffers[0].NumberChannels = (uint)samples.Channels;
bufferList.Buffers[0].DataByteSize = (uint)(index * Marshal.SizeOf <int>());
bufferList.Buffers[0].Data = handle.AddrOfPinnedObject();
ExtendedAudioFileStatus status = _audioFile.Write(bufferList, (uint)samples.SampleCount);
if (status != ExtendedAudioFileStatus.Ok)
{
throw new IOException(string.Format(CultureInfo.CurrentCulture,
Resources.SampleEncoderWriteError, status));
}
}
finally
{
handle.Free();
}
}
else
{
_audioFile.Dispose();
// Call an external MP4 encoder for writing iTunes-compatible atoms:
_stream.Position = 0;
ExportFactory <IMetadataEncoder> metadataEncoderFactory =
ExtensionProvider.GetFactories <IMetadataEncoder>("Extension", EncoderInfo.FileExtension)
.SingleOrDefault();
if (metadataEncoderFactory == null)
{
throw new ExtensionInitializationException(string.Format(CultureInfo.CurrentCulture,
Resources.SampleEncoderMetadataEncoderError, EncoderInfo.FileExtension));
}
using (ExportLifetimeContext <IMetadataEncoder> metadataEncoderLifetime = metadataEncoderFactory.CreateExport())
metadataEncoderLifetime.Value.WriteMetadata(_stream, _metadata, _settings);
}
}
public void Initialize(Stream stream, AudioInfo audioInfo, MetadataDictionary metadata, SettingsDictionary settings)
{
Contract.Ensures(_stream != null);
Contract.Ensures(_stream == stream);
Contract.Ensures(_metadata != null);
Contract.Ensures(_metadata == metadata);
Contract.Ensures(_settings != null);
Contract.Ensures(_settings == settings);
Contract.Ensures(_audioFile != null);
_stream = stream;
_metadata = metadata;
_settings = settings;
// Load the external gain filter:
ExportFactory <ISampleFilter> sampleFilterFactory =
ExtensionProvider.GetFactories <ISampleFilter>("Name", "ReplayGain").SingleOrDefault();
if (sampleFilterFactory == null)
{
throw new ExtensionInitializationException(Resources.AacSampleEncoderReplayGainFilterError);
}
_replayGainFilterLifetime = sampleFilterFactory.CreateExport();
_replayGainFilterLifetime.Value.Initialize(metadata, settings);
AudioStreamBasicDescription inputDescription = GetInputDescription(audioInfo);
AudioStreamBasicDescription outputDescription = GetOutputDescription(inputDescription);
try
{
_audioFile = new NativeExtendedAudioFile(outputDescription, AudioFileType.M4A, stream);
ExtendedAudioFileStatus status = _audioFile.SetProperty(ExtendedAudioFilePropertyId.ClientDataFormat,
inputDescription);
if (status != ExtendedAudioFileStatus.Ok)
{
throw new IOException(string.Format(CultureInfo.CurrentCulture,
Resources.SampleEncoderInitializationError, status));
}
// Configure the audio converter:
ConfigureConverter(settings, audioInfo.Channels,
_audioFile.GetProperty <IntPtr>(ExtendedAudioFilePropertyId.AudioConverter));
// Setting the ConverterConfig property to null resynchronizes the converter settings:
ExtendedAudioFileStatus fileStatus = _audioFile.SetProperty(
ExtendedAudioFilePropertyId.ConverterConfig, IntPtr.Zero);
if (fileStatus != ExtendedAudioFileStatus.Ok)
{
throw new IOException(string.Format(CultureInfo.CurrentCulture,
Resources.SampleEncoderConverterError, status));
}
}
catch (TypeInitializationException e)
{
if (e.InnerException != null && e.InnerException.GetType() == typeof(ExtensionInitializationException))
{
throw e.InnerException;
}
throw;
}
}
