/// <summary>
/// Transcodes the source audio to the target format and quality.
/// </summary>
/// <param name="formatType">Format to convert this audio to.</param>
/// <param name="quality">Quality of the processed output audio. For streaming formats, it can be one of the following: Low (96 kbps), Medium (128 kbps), Best (192 kbps). For WAV formats, it can be one of the following: Low (11kHz ADPCM), Medium (22kHz ADPCM), Best (44kHz PCM)</param>
/// <param name="saveToFile">
/// The name of the file that the converted audio should be saved into. This is used for SongContent, where
/// the audio is stored external to the XNB file. If this is null, then the converted audio is stored in
/// the Data property.
/// </param>
public void ConvertFormat(ConversionFormat formatType, ConversionQuality quality, string saveToFile)
{
if (disposed)
throw new ObjectDisposedException("AudioContent");
var temporarySource = Path.GetTempFileName();
var temporaryOutput = Path.GetTempFileName();
try
{
using (var fs = new FileStream(temporarySource, FileMode.Create, FileAccess.Write))
{
var dataBytes = this.data.ToArray();
fs.Write(dataBytes, 0, dataBytes.Length);
}
string ffmpegCodecName, ffmpegMuxerName;
int format;
switch (formatType)
{
case ConversionFormat.Adpcm:
// ADPCM Microsoft
ffmpegCodecName = "adpcm_ms";
ffmpegMuxerName = "wav";
format = 0x0002; /* WAVE_FORMAT_ADPCM */
break;
case ConversionFormat.Pcm:
// PCM signed 16-bit little-endian
ffmpegCodecName = "pcm_s16le";
ffmpegMuxerName = "s16le";
format = 0x0001; /* WAVE_FORMAT_PCM */
break;
case ConversionFormat.WindowsMedia:
// Windows Media Audio 2
ffmpegCodecName = "wmav2";
ffmpegMuxerName = "asf";
format = 0x0161; /* WAVE_FORMAT_WMAUDIO2 */
break;
case ConversionFormat.Xma:
throw new NotSupportedException(
"XMA is not a supported encoding format. It is specific to the Xbox 360.");
case ConversionFormat.ImaAdpcm:
// ADPCM IMA WAV
ffmpegCodecName = "adpcm_ima_wav";
ffmpegMuxerName = "wav";
format = 0x0011; /* WAVE_FORMAT_IMA_ADPCM */
break;
case ConversionFormat.Aac:
// AAC (Advanced Audio Coding)
// Requires -strict experimental
ffmpegCodecName = "aac";
ffmpegMuxerName = "ipod";
format = 0x0000; /* WAVE_FORMAT_UNKNOWN */
break;
case ConversionFormat.Vorbis:
// Vorbis
ffmpegCodecName = "libvorbis";
ffmpegMuxerName = "ogg";
format = 0x0000; /* WAVE_FORMAT_UNKNOWN */
break;
default:
// Unknown format
throw new NotSupportedException();
}
string ffmpegStdout, ffmpegStderr;
var ffmpegExitCode = ExternalTool.Run(
"ffmpeg",
string.Format(
"-y -i \"{0}\" -vn -c:a {1} -b:a {2} -f:a {3} -strict experimental \"{4}\"",
temporarySource,
ffmpegCodecName,
QualityToBitRate(quality),
ffmpegMuxerName,
temporaryOutput),
out ffmpegStdout,
out ffmpegStderr);
if (ffmpegExitCode != 0)
{
throw new InvalidOperationException("ffmpeg exited with non-zero exit code: \n" + ffmpegStdout + "\n" + ffmpegStderr);
}
byte[] rawData;
using (var fs = new FileStream(temporaryOutput, FileMode.Open, FileAccess.Read))
{
rawData = new byte[fs.Length];
fs.Read(rawData, 0, rawData.Length);
}
if (saveToFile != null)
{
using (var fs = new FileStream(saveToFile, FileMode.Create, FileAccess.Write))
{
fs.Write(rawData, 0, rawData.Length);
}
this.data = null;
}
else
{
this.data = rawData.ToList();
}
string ffprobeStdout, ffprobeStderr;
var ffprobeExitCode = ExternalTool.Run(
"ffprobe",
string.Format("-i \"{0}\" -show_entries streams -v quiet -of flat", temporarySource),
out ffprobeStdout,
out ffprobeStderr);
if (ffprobeExitCode != 0)
{
throw new InvalidOperationException("ffprobe exited with non-zero exit code.");
}
// Set default values if information is not available.
int averageBytesPerSecond = 0;
int bitsPerSample = 0;
int blockAlign = 0;
int channelCount = 0;
int sampleRate = 0;
double durationInSeconds = 0;
var numberFormat = System.Globalization.CultureInfo.InvariantCulture.NumberFormat;
foreach (var line in ffprobeStdout.Split(new[] { '\r', '\n', '\0' }, StringSplitOptions.RemoveEmptyEntries))
{
var kv = line.Split(new[] { '=' }, 2);
switch (kv[0])
{
case "streams.stream.0.sample_rate":
sampleRate = int.Parse(kv[1].Trim('"'), numberFormat);
break;
case "streams.stream.0.bits_per_sample":
bitsPerSample = int.Parse(kv[1].Trim('"'), numberFormat);
break;
case "streams.stream.0.duration":
durationInSeconds = double.Parse(kv[1].Trim('"'), numberFormat);
break;
case "streams.stream.0.channels":
channelCount = int.Parse(kv[1].Trim('"'), numberFormat);
break;
}
}
// This information is not available from ffprobe (and may or may not
// be relevant for non-PCM formats anyway):
//
// * averageBytesPerSecond
// * blockAlign
this.duration = TimeSpan.FromSeconds(durationInSeconds);
this.format = new AudioFormat(
averageBytesPerSecond,
bitsPerSample,
blockAlign,
channelCount,
format,
sampleRate);
}
finally
{
File.Delete(temporarySource);
File.Delete(temporaryOutput);
}
}
/// <summary>
/// Read an audio file.
/// </summary>
void Read()
{
#if WINDOWS
reader = new MediaFoundationReader(fileName);
duration = reader.TotalTime;
format = new AudioFormat(reader.WaveFormat);
var bytes = new byte[reader.Length];
var read = reader.Read(bytes, 0, bytes.Length);
data = new List<byte>(bytes);
#else
throw new NotImplementedException();
#endif
}
/// <summary>
/// Transcodes the source audio to the target format and quality.
/// </summary>
/// <param name="formatType">Format to convert this audio to.</param>
/// <param name="quality">Quality of the processed output audio. For streaming formats, it can be one of the following: Low (96 kbps), Medium (128 kbps), Best (192 kbps). For WAV formats, it can be one of the following: Low (11kHz ADPCM), Medium (22kHz ADPCM), Best (44kHz PCM)</param>
/// <param name="saveToFile">
/// The name of the file that the converted audio should be saved into. This is used for SongContent, where
/// the audio is stored external to the XNB file. If this is null, then the converted audio is stored in
/// the Data property.
/// </param>
public void ConvertFormat(ConversionFormat formatType, ConversionQuality quality, string saveToFile)
{
var temporarySource = Path.GetTempFileName();
var temporaryOutput = Path.GetTempFileName();
try
{
using (var fs = new FileStream(temporarySource, FileMode.Create, FileAccess.Write))
{
var dataBytes = this.data.ToArray();
fs.Write(dataBytes, 0, dataBytes.Length);
}
string ffmpegCodecName, ffmpegMuxerName;
int format;
switch (formatType)
{
case ConversionFormat.Adpcm:
// ADPCM Microsoft
ffmpegCodecName = "adpcm_ms";
ffmpegMuxerName = "wav";
format = 0x0002; /* WAVE_FORMAT_ADPCM */
break;
case ConversionFormat.Pcm:
// PCM signed 16-bit little-endian
ffmpegCodecName = "pcm_s16le";
ffmpegMuxerName = "wav";
format = 0x0001; /* WAVE_FORMAT_PCM */
break;
case ConversionFormat.WindowsMedia:
// Windows Media Audio 2
ffmpegCodecName = "wmav2";
ffmpegMuxerName = "asf";
format = 0x0161; /* WAVE_FORMAT_WMAUDIO2 */
break;
case ConversionFormat.Xma:
throw new NotSupportedException(
"XMA is not a supported encoding format. It is specific to the Xbox 360.");
case ConversionFormat.ImaAdpcm:
// ADPCM IMA WAV
ffmpegCodecName = "adpcm_ima_wav";
ffmpegMuxerName = "wav";
format = 0x0011; /* WAVE_FORMAT_IMA_ADPCM */
break;
case ConversionFormat.Aac:
// AAC (Advanced Audio Coding)
// Requires -strict experimental
ffmpegCodecName = "aac";
ffmpegMuxerName = "ipod";
format = 0x0000; /* WAVE_FORMAT_UNKNOWN */
break;
case ConversionFormat.Vorbis:
// Vorbis
ffmpegCodecName = "libvorbis";
ffmpegMuxerName = "ogg";
format = 0x0000; /* WAVE_FORMAT_UNKNOWN */
break;
default:
// Unknown format
throw new NotSupportedException();
}
string ffmpegStdout, ffmpegStderr;
var ffmpegExitCode = ExternalTool.Run(
"ffmpeg",
string.Format(
"-y -i \"{0}\" -vn -c:a {1} -b:a {2} -f:a {3} -strict experimental \"{4}\"",
temporarySource,
ffmpegCodecName,
QualityToBitRate(quality),
ffmpegMuxerName,
temporaryOutput),
out ffmpegStdout,
out ffmpegStderr);
if (ffmpegExitCode != 0)
{
throw new InvalidOperationException("ffmpeg exited with non-zero exit code: \n" + ffmpegStdout + "\n" + ffmpegStderr);
}
byte[] rawData;
using (var fs = new FileStream(temporaryOutput, FileMode.Open, FileAccess.Read))
{
rawData = new byte[fs.Length];
fs.Read(rawData, 0, rawData.Length);
}
if (saveToFile != null)
{
using (var fs = new FileStream(saveToFile, FileMode.Create, FileAccess.Write))
{
fs.Write(rawData, 0, rawData.Length);
}
this.data = null;
}
else
{
this.data = rawData.ToList();
}
// Get the audio metadata from the output file
string ffprobeStdout, ffprobeStderr;
var ffprobeExitCode = ExternalTool.Run(
"ffprobe",
string.Format("-i \"{0}\" -show_entries streams -v quiet -of flat", temporaryOutput),
out ffprobeStdout,
out ffprobeStderr);
if (ffprobeExitCode != 0)
{
throw new InvalidOperationException("ffprobe exited with non-zero exit code.");
}
// Set default values if information is not available.
int averageBytesPerSecond = 0;
int bitsPerSample = 0;
int blockAlign = 0;
int channelCount = 0;
int sampleRate = 0;
double durationInSeconds = 0;
var numberFormat = System.Globalization.CultureInfo.InvariantCulture.NumberFormat;
foreach (var line in ffprobeStdout.Split(new[] { '\r', '\n', '\0' }, StringSplitOptions.RemoveEmptyEntries))
{
var kv = line.Split(new[] { '=' }, 2);
switch (kv[0])
{
case "streams.stream.0.sample_rate":
sampleRate = int.Parse(kv[1].Trim('"'), numberFormat);
break;
case "streams.stream.0.bits_per_sample":
bitsPerSample = int.Parse(kv[1].Trim('"'), numberFormat);
break;
case "streams.stream.0.duration":
durationInSeconds = double.Parse(kv[1].Trim('"'), numberFormat);
break;
case "streams.stream.0.channels":
channelCount = int.Parse(kv[1].Trim('"'), numberFormat);
break;
case "streams.stream.0.bit_rate":
averageBytesPerSecond = (int.Parse(kv[1].Trim('"'), numberFormat) / 8);
break;
}
}
// Calculate blockAlign.
switch (formatType)
{
case ConversionFormat.Adpcm:
case ConversionFormat.ImaAdpcm:
case ConversionFormat.Pcm:
// Block alignment value is the number of bytes in an atomic unit (that is, a block) of audio for a particular format. For Pulse Code Modulation (PCM) formats, the formula for calculating block alignment is as follows:
// • Block Alignment = Bytes per Sample x Number of Channels
// For example, the block alignment value for 16-bit PCM format mono audio is 2 (2 bytes per sample x 1 channel). For 16-bit PCM format stereo audio, the block alignment value is 4.
// https://msdn.microsoft.com/en-us/library/system.speech.audioformat.speechaudioformatinfo.blockalign(v=vs.110).aspx
// Get the raw PCM from the output WAV file
using (var reader = new BinaryReader(new MemoryStream(rawData)))
{
data = GetRawWavData(reader, ref blockAlign).ToList();
}
break;
default:
// blockAlign is not available from ffprobe (and may or may not
// be relevant for non-PCM formats anyway)
break;
}
this.duration = TimeSpan.FromSeconds(durationInSeconds);
this.format = new AudioFormat(
averageBytesPerSecond,
bitsPerSample,
blockAlign,
channelCount,
format,
sampleRate);
// Loop start and length in number of samples. Defaults to entire sound
loopStart = 0;
if (data != null && bitsPerSample > 0 && channelCount > 0)
loopLength = data.Count / ((bitsPerSample / 8) * channelCount);
else
loopLength = 0;
}
finally
{
File.Delete(temporarySource);
File.Delete(temporaryOutput);
}
}
public static void ProbeFormat(string sourceFile, out AudioFileType audioFileType, out AudioFormat audioFormat, out TimeSpan duration, out int loopStart, out int loopLength)
{
string ffprobeStdout, ffprobeStderr;
var ffprobeExitCode = ExternalTool.Run(
"ffprobe",
string.Format("-i \"{0}\" -show_format -show_entries streams -v quiet -of flat", sourceFile),
out ffprobeStdout,
out ffprobeStderr);
if (ffprobeExitCode != 0)
{
throw new InvalidOperationException("ffprobe exited with non-zero exit code.");
}
// Set default values if information is not available.
int averageBytesPerSecond = 0;
int bitsPerSample = 0;
int blockAlign = 0;
int channelCount = 0;
int sampleRate = 0;
int format = 0;
string sampleFormat = null;
double durationInSeconds = 0;
var formatName = string.Empty;
try
{
var numberFormat = CultureInfo.InvariantCulture.NumberFormat;
foreach (var line in ffprobeStdout.Split(new[] { '\r', '\n', '\0' }, StringSplitOptions.RemoveEmptyEntries))
{
var kv = line.Split(new[] { '=' }, 2);
switch (kv[0])
{
case "streams.stream.0.sample_rate":
sampleRate = int.Parse(kv[1].Trim('"'), numberFormat);
break;
case "streams.stream.0.bits_per_sample":
bitsPerSample = int.Parse(kv[1].Trim('"'), numberFormat);
break;
case "streams.stream.0.start_time":
{
double seconds;
if (double.TryParse(kv[1].Trim('"'), NumberStyles.Any, numberFormat, out seconds))
{
durationInSeconds += seconds;
}
break;
}
case "streams.stream.0.duration":
durationInSeconds += double.Parse(kv[1].Trim('"'), numberFormat);
break;
case "streams.stream.0.channels":
channelCount = int.Parse(kv[1].Trim('"'), numberFormat);
break;
case "streams.stream.0.sample_fmt":
sampleFormat = kv[1].Trim('"').ToLowerInvariant();
break;
case "streams.stream.0.bit_rate":
averageBytesPerSecond = (int.Parse(kv[1].Trim('"'), numberFormat) / 8);
break;
case "format.format_name":
formatName = kv[1].Trim('"').ToLowerInvariant();
break;
case "streams.stream.0.codec_tag":
{
var hex = kv[1].Substring(3, kv[1].Length - 4);
format = int.Parse(hex, NumberStyles.HexNumber);
break;
}
}
}
}
catch (Exception ex)
{
throw new InvalidOperationException("Failed to parse ffprobe output.", ex);
}
// XNA seems to use the sample format for the bits per sample
// in the case of non-PCM formats like MP3 and WMA.
if (bitsPerSample == 0 && sampleFormat != null)
{
switch (sampleFormat)
{
case "u8":
case "u8p":
bitsPerSample = 8;
break;
case "s16":
case "s16p":
bitsPerSample = 16;
break;
case "s32":
case "s32p":
case "flt":
case "fltp":
bitsPerSample = 32;
break;
case "dbl":
case "dblp":
bitsPerSample = 64;
break;
}
}
// Figure out the file type.
var durationMs = (int)Math.Floor(durationInSeconds * 1000.0);
if (formatName == "wav")
{
audioFileType = AudioFileType.Wav;
}
else if (formatName == "mp3")
{
audioFileType = AudioFileType.Mp3;
format = 1;
durationMs = (int)Math.Ceiling(durationInSeconds * 1000.0);
bitsPerSample = Math.Min(bitsPerSample, 16);
}
else if (formatName == "wma" || formatName == "asf")
{
audioFileType = AudioFileType.Wma;
format = 1;
durationMs = (int)Math.Ceiling(durationInSeconds * 1000.0);
bitsPerSample = Math.Min(bitsPerSample, 16);
}
else if (formatName == "ogg")
{
audioFileType = AudioFileType.Ogg;
format = 1;
durationMs = (int)Math.Ceiling(durationInSeconds * 1000.0);
bitsPerSample = Math.Min(bitsPerSample, 16);
}
else
{
audioFileType = (AudioFileType)(-1);
}
// XNA seems to calculate the block alignment directly from
// the bits per sample and channel count regardless of the
// format of the audio data.
// ffprobe doesn't report blockAlign for ADPCM and we cannot calculate it like this
if (bitsPerSample > 0 && (format != 2 && format != 17))
{
blockAlign = (bitsPerSample * channelCount) / 8;
}
// XNA seems to only be accurate to the millisecond.
duration = TimeSpan.FromMilliseconds(durationMs);
// Looks like XNA calculates the average bps from
// the sample rate and block alignment.
if (blockAlign > 0)
{
averageBytesPerSecond = sampleRate * blockAlign;
}
audioFormat = new AudioFormat(
averageBytesPerSecond,
bitsPerSample,
blockAlign,
channelCount,
format,
sampleRate);
// Loop start and length in number of samples. For some
// reason XNA doesn't report loop length for non-WAV sources.
loopStart = 0;
if (audioFileType != AudioFileType.Wav)
{
loopLength = 0;
}
else
{
loopLength = (int)Math.Floor(sampleRate * durationInSeconds);
}
}
/// <summary>
/// Transcodes the source audio to the target format and quality.
/// </summary>
/// <param name="formatType">Format to convert this audio to.</param>
/// <param name="quality">Quality of the processed output audio. For streaming formats, it can be one of the following: Low (96 kbps), Medium (128 kbps), Best (192 kbps). For WAV formats, it can be one of the following: Low (11kHz ADPCM), Medium (22kHz ADPCM), Best (44kHz PCM)</param>
/// <param name="saveToFile">
/// The name of the file that the converted audio should be saved into. This is used for SongContent, where
/// the audio is stored external to the XNB file. If this is null, then the converted audio is stored in
/// the Data property.
/// </param>
public void ConvertFormat(ConversionFormat formatType, ConversionQuality quality, string saveToFile)
{
var temporarySource = Path.GetTempFileName();
var temporaryOutput = Path.GetTempFileName();
try
{
using (var fs = new FileStream(temporarySource, FileMode.Create, FileAccess.Write))
{
var dataBytes = this.data.ToArray();
fs.Write(dataBytes, 0, dataBytes.Length);
}
string ffmpegCodecName, ffmpegMuxerName;
int format;
switch (formatType)
{
case ConversionFormat.Adpcm:
// ADPCM Microsoft
ffmpegCodecName = "adpcm_ms";
ffmpegMuxerName = "wav";
format = 0x0002; /* WAVE_FORMAT_ADPCM */
break;
case ConversionFormat.Pcm:
// PCM signed 16-bit little-endian
ffmpegCodecName = "pcm_s16le";
ffmpegMuxerName = "s16le";
format = 0x0001; /* WAVE_FORMAT_PCM */
break;
case ConversionFormat.WindowsMedia:
// Windows Media Audio 2
ffmpegCodecName = "wmav2";
ffmpegMuxerName = "asf";
format = 0x0161; /* WAVE_FORMAT_WMAUDIO2 */
break;
case ConversionFormat.Xma:
throw new NotSupportedException(
"XMA is not a supported encoding format. It is specific to the Xbox 360.");
case ConversionFormat.ImaAdpcm:
// ADPCM IMA WAV
ffmpegCodecName = "adpcm_ima_wav";
ffmpegMuxerName = "wav";
format = 0x0011; /* WAVE_FORMAT_IMA_ADPCM */
break;
case ConversionFormat.Aac:
// AAC (Advanced Audio Coding)
// Requires -strict experimental
ffmpegCodecName = "aac";
ffmpegMuxerName = "ipod";
format = 0x0000; /* WAVE_FORMAT_UNKNOWN */
break;
case ConversionFormat.Vorbis:
// Vorbis
ffmpegCodecName = "libvorbis";
ffmpegMuxerName = "ogg";
format = 0x0000; /* WAVE_FORMAT_UNKNOWN */
break;
default:
// Unknown format
throw new NotSupportedException();
}
string ffmpegStdout, ffmpegStderr;
var ffmpegExitCode = ExternalTool.Run(
"ffmpeg",
string.Format(
"-y -i \"{0}\" -vn -c:a {1} -b:a {2} -f:a {3} -strict experimental \"{4}\"",
temporarySource,
ffmpegCodecName,
QualityToBitRate(quality),
ffmpegMuxerName,
temporaryOutput),
out ffmpegStdout,
out ffmpegStderr);
if (ffmpegExitCode != 0)
{
throw new InvalidOperationException("ffmpeg exited with non-zero exit code: \n" + ffmpegStdout + "\n" + ffmpegStderr);
}
byte[] rawData;
using (var fs = new FileStream(temporaryOutput, FileMode.Open, FileAccess.Read))
{
rawData = new byte[fs.Length];
fs.Read(rawData, 0, rawData.Length);
}
if (saveToFile != null)
{
using (var fs = new FileStream(saveToFile, FileMode.Create, FileAccess.Write))
{
fs.Write(rawData, 0, rawData.Length);
}
this.data = null;
}
else
{
this.data = rawData.ToList();
}
string ffprobeStdout, ffprobeStderr;
var ffprobeExitCode = ExternalTool.Run(
"ffprobe",
string.Format("-i \"{0}\" -show_entries streams -v quiet -of flat", temporarySource),
out ffprobeStdout,
out ffprobeStderr);
if (ffprobeExitCode != 0)
{
throw new InvalidOperationException("ffprobe exited with non-zero exit code.");
}
// Set default values if information is not available.
int averageBytesPerSecond = 0;
int bitsPerSample = 0;
int blockAlign = 0;
int channelCount = 0;
int sampleRate = 0;
double durationInSeconds = 0;
var numberFormat = System.Globalization.CultureInfo.InvariantCulture.NumberFormat;
foreach (var line in ffprobeStdout.Split(new[] { '\r', '\n', '\0' }, StringSplitOptions.RemoveEmptyEntries))
{
var kv = line.Split(new[] { '=' }, 2);
switch (kv[0])
{
case "streams.stream.0.sample_rate":
sampleRate = int.Parse(kv[1].Trim('"'), numberFormat);
break;
case "streams.stream.0.bits_per_sample":
bitsPerSample = int.Parse(kv[1].Trim('"'), numberFormat);
break;
case "streams.stream.0.duration":
durationInSeconds = double.Parse(kv[1].Trim('"'), numberFormat);
break;
case "streams.stream.0.channels":
channelCount = int.Parse(kv[1].Trim('"'), numberFormat);
break;
case "streams.stream.0.bit_rate":
averageBytesPerSecond = (int.Parse(kv[1].Trim('"'), numberFormat) / 8);
break;
}
}
// Calculate blockAlign.
switch (formatType)
{
case ConversionFormat.Pcm:
// Block alignment value is the number of bytes in an atomic unit (that is, a block) of audio for a particular format. For Pulse Code Modulation (PCM) formats, the formula for calculating block alignment is as follows:
// • Block Alignment = Bytes per Sample x Number of Channels
// For example, the block alignment value for 16-bit PCM format mono audio is 2 (2 bytes per sample x 1 channel). For 16-bit PCM format stereo audio, the block alignment value is 4.
// https://msdn.microsoft.com/en-us/library/system.speech.audioformat.speechaudioformatinfo.blockalign(v=vs.110).aspx
blockAlign = (bitsPerSample / 8) * channelCount;
break;
default:
// blockAlign is not available from ffprobe (and may or may not
// be relevant for non-PCM formats anyway)
break;
}
this.duration = TimeSpan.FromSeconds(durationInSeconds);
this.format = new AudioFormat(
averageBytesPerSecond,
bitsPerSample,
blockAlign,
channelCount,
format,
sampleRate);
// Loop start and length in number of samples. Defaults to entire sound
loopStart = 0;
if (data != null && bitsPerSample > 0 && channelCount > 0)
{
loopLength = data.Count / ((bitsPerSample / 8) * channelCount);
}
else
{
loopLength = 0;
}
}
finally
{
File.Delete(temporarySource);
File.Delete(temporaryOutput);
}
}
/// <summary>
/// Converts the audio using the specified wave format.
/// </summary>
/// <param name="waveFormat">The WaveFormat to use for the conversion.</param>
void ConvertWav(WaveFormat waveFormat)
{
reader.Position = 0;
#if WINDOWS
//var mediaTypes = MediaFoundationEncoder.GetOutputMediaTypes(NAudio.MediaFoundation.AudioSubtypes.MFAudioFormat_PCM);
using (var resampler = new MediaFoundationResampler(reader, waveFormat))
{
using (var outStream = new MemoryStream())
{
// Since we cannot determine ahead of time the number of bytes to be
// read, read four seconds worth at a time.
byte[] bytes = new byte[reader.WaveFormat.AverageBytesPerSecond * 4];
while (true)
{
int bytesRead = resampler.Read(bytes, 0, bytes.Length);
if (bytesRead == 0)
break;
outStream.Write(bytes, 0, bytesRead);
}
data = new List<byte>(outStream.ToArray());
format = new AudioFormat(waveFormat);
}
}
#else
throw new NotImplementedException();
#endif
}
