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AudioManager.cs
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using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Text.Json;
using System.Text.Json.Serialization;
using System.Threading;
using System.Threading.Tasks;
using TensorStack.Common;
using TensorStack.Common.Common;
using TensorStack.Common.Tensor;
namespace TensorStack.Audio.Windows
{
public static class AudioManager
{
private static string FFMpegPath = "ffmpeg.exe";
private static string FFProbePath = "ffprobe.exe";
private static string DirectoryTemp = "Temp";
/// <summary>
/// Configures the specified ffmpeg/ffprobe path.
/// </summary>
/// <param name="ffmpegPath">The ffmpeg path.</param>
/// <param name="ffprobePath">The ffprobe path.</param>
/// <param name="directoryTemp">The directory temporary.</param>
public static void Initialize(string ffmpegPath = default, string ffprobePath = default, string directoryTemp = default)
{
if (!string.IsNullOrEmpty(ffmpegPath))
FFMpegPath = ffmpegPath;
if (!string.IsNullOrEmpty(ffprobePath))
FFProbePath = ffprobePath;
if (!string.IsNullOrEmpty(directoryTemp))
DirectoryTemp = directoryTemp;
}
/// <summary>
/// Loads the audio information.
/// </summary>
/// <param name="filename">The filename.</param>
public static AudioInfo LoadInfo(string filename)
{
return ReadInfo(filename);
}
/// <summary>
/// Loads the audio information asynchronously.
/// </summary>
/// <param name="filename">The filename.</param>
public static async Task<AudioInfo> LoadInfoAsync(string filename)
{
return await ReadInfoAsync(filename);
}
/// <summary>
/// Loads the tensor.
/// </summary>
/// <param name="filename">The filename.</param>
/// <param name="audioCodec">The audio codec.</param>
/// <param name="sampleRate">The sample rate.</param>
/// <param name="channels">The channels.</param>
public static AudioTensor LoadTensor(string filename, string audioCodec = "pcm_s16le", int sampleRate = 16000, int channels = 1)
{
return ReadAudio(filename, audioCodec, sampleRate, channels);
}
/// <summary>
/// Loads the tensor asynchronously.
/// </summary>
/// <param name="filename">The filename.</param>
/// <param name="audioCodec">The audio codec.</param>
/// <param name="sampleRate">The sample rate.</param>
/// <param name="channels">The channels.</param>
/// <param name="cancellationToken">The cancellation token.</param>
public static async Task<AudioTensor> LoadTensorAsync(string filename, string audioCodec = "pcm_s16le", int sampleRate = 16000, int channels = 1, CancellationToken cancellationToken = default)
{
return await ReadAudioAsync(filename, audioCodec, sampleRate, channels, cancellationToken);
}
/// <summary>
/// Saves the audio to file.
/// </summary>
/// <param name="filename">The filename.</param>
/// <param name="audioTensor">The audio tensor.</param>
public static void SaveAudio(string filename, AudioTensor audioTensor)
{
WriteAudio(filename, audioTensor);
}
/// <summary>
/// Saves the audio to file asynchronously.
/// </summary>
/// <param name="filename">The filename.</param>
/// <param name="audioTensor">The audio tensor.</param>
/// <param name="cancellationToken">The cancellation token.</param>
public static async Task SaveAudioAync(string filename, AudioTensor audioTensor, CancellationToken cancellationToken = default)
{
await WriteAudioAsync(filename, audioTensor, cancellationToken);
}
/// <summary>
/// Adds the audio from source video to target video.
/// </summary>
/// <param name="targetVideoFile">The target video file.</param>
/// <param name="sourceVideoFile">The source video file.</param>
public static void AddAudio(string targetVideoFile, string sourceVideoFile)
{
MuxAudio(targetVideoFile, sourceVideoFile);
}
/// <summary>
/// Adds the audio from source video to target video asynchronously.
/// </summary>
/// <param name="targetVideoFile">The target video file.</param>
/// <param name="sourceVideoFile">The source video file.</param>
/// <param name="cancellationToken">The cancellation token.</param>
public static async Task AddAudioAsync(string targetVideoFile, string sourceVideoFile, CancellationToken cancellationToken = default)
{
await MuxAudioAsync(targetVideoFile, sourceVideoFile, cancellationToken);
}
/// <summary>
/// Reads the audio data as AudioTensor
/// </summary>
/// <param name="audioInputFile">The audio input file.</param>
/// <param name="audioCodec">The audio codec.</param>
/// <param name="sampleRate">The sample rate.</param>
/// <param name="channels">The channels.</param>
/// <returns>AudioTensor.</returns>
private static AudioTensor ReadAudio(string audioInputFile, string audioCodec, int sampleRate, int channels)
{
using (var ffmpeg = CreateReader(audioInputFile, audioCodec, sampleRate, channels))
using (var audioStream = new MemoryStream())
{
ffmpeg.Start();
ffmpeg.StandardOutput.BaseStream.CopyTo(audioStream);
ffmpeg.WaitForExit();
var audioBytes = audioStream.ToArray();
return CreateAudioTensor(audioBytes, channels, sampleRate);
}
}
/// <summary>
/// Reads the audio data as AudioTensor asynchronously.
/// </summary>
/// <param name="audioInputFile">The audio input file.</param>
/// <param name="audioCodec">The audio codec.</param>
/// <param name="sampleRate">The sample rate.</param>
/// <param name="channels">The channels.</param>
/// <param name="cancellationToken">The cancellation token.</param>
private static async Task<AudioTensor> ReadAudioAsync(string audioInputFile, string audioCodec, int sampleRate, int channels, CancellationToken cancellationToken = default)
{
using (var ffmpeg = CreateReader(audioInputFile, audioCodec, sampleRate, channels))
using (var audioStream = new MemoryStream())
{
ffmpeg.Start();
await ffmpeg.StandardOutput.BaseStream.CopyToAsync(audioStream, cancellationToken);
await ffmpeg.WaitForExitAsync(cancellationToken);
var audioBytes = audioStream.ToArray();
return CreateAudioTensor(audioBytes, channels, sampleRate);
}
}
/// <summary>
/// Writes the AudioTensor to file.
/// </summary>
/// <param name="audioOutputFile">The audio output file.</param>
/// <param name="audioTensor">The audio tensor.</param>
private static void WriteAudio(string audioOutputFile, AudioTensor audioTensor)
{
var samples = audioTensor.Samples;
var channels = audioTensor.Channels;
var sampleRate = audioTensor.SampleRate;
using (var ffmpeg = CreateWriter(audioOutputFile, sampleRate, channels))
{
ffmpeg.Start();
using (var audioStream = ffmpeg.StandardInput.BaseStream)
{
var audioBuffer = CreateAudioBuffer(audioTensor, channels, samples);
audioStream.Write(audioBuffer);
audioStream.Flush();
}
ffmpeg.WaitForExit();
}
}
/// <summary>
/// Writes the AudioTensor to file asynchronously.
/// </summary>
/// <param name="audioOutputFile">The audio output file.</param>
/// <param name="audioTensor">The audio tensor.</param>
/// <param name="cancellationToken">The cancellation token.</param>
private static async Task WriteAudioAsync(string audioOutputFile, AudioTensor audioTensor, CancellationToken cancellationToken = default)
{
var samples = audioTensor.Samples;
var channels = audioTensor.Channels;
var sampleRate = audioTensor.SampleRate;
using (var ffmpeg = CreateWriter(audioOutputFile, sampleRate, channels))
{
ffmpeg.Start();
using (var audioStream = ffmpeg.StandardInput.BaseStream)
{
var audioBuffer = CreateAudioBuffer(audioTensor, channels, samples);
await audioStream.WriteAsync(audioBuffer, cancellationToken);
await audioStream.FlushAsync(cancellationToken);
}
await ffmpeg.WaitForExitAsync(cancellationToken);
}
}
/// <summary>
/// Muxes the audio.
/// </summary>
/// <param name="targetVideoFile">The target video file.</param>
/// <param name="sourceVideoFile">The source video file.</param>
internal static void MuxAudio(string targetVideoFile, string sourceVideoFile)
{
var tempFile = FileHelper.RandomFileName(DirectoryTemp, targetVideoFile);
try
{
using (var ffmpeg = CreateMuxer(targetVideoFile, sourceVideoFile, tempFile))
{
ffmpeg.Start();
ffmpeg.WaitForExit();
}
if (File.Exists(tempFile))
File.Move(tempFile, targetVideoFile, true);
}
finally
{
FileHelper.QueueDeleteFile(tempFile);
}
}
/// <summary>
/// Muxes the audio asynchronously.
/// </summary>
/// <param name="targetVideoFile">The target video file.</param>
/// <param name="sourceVideoFile">The source video file.</param>
/// <param name="cancellationToken">The cancellation token.</param>
internal static async Task MuxAudioAsync(string targetVideoFile, string sourceVideoFile, CancellationToken cancellationToken = default)
{
var tempFile = FileHelper.RandomFileName(DirectoryTemp, targetVideoFile);
try
{
using (var ffmpeg = CreateMuxer(targetVideoFile, sourceVideoFile, tempFile))
{
ffmpeg.Start();
await ffmpeg.WaitForExitAsync(cancellationToken);
}
if (File.Exists(tempFile))
File.Move(tempFile, targetVideoFile, true);
}
finally
{
FileHelper.QueueDeleteFile(tempFile);
}
}
/// <summary>
/// Reads the information.
/// </summary>
/// <param name="filename">The filename.</param>
/// <returns>AudioInfo.</returns>
internal static AudioInfo ReadInfo(string filename)
{
using (var metadataReader = CreateMetadata(filename))
{
metadataReader.Start();
var videoInfo = default(AudioInfo);
using (var reader = metadataReader.StandardOutput)
{
videoInfo = ParseInfo(filename, reader.ReadToEnd());
}
metadataReader.WaitForExit();
return videoInfo;
}
}
/// <summary>
/// Reads the information asynchronously.
/// </summary>
/// <param name="filename">The filename.</param>
/// <param name="cancellationToken">The cancellation token.</param>
internal static async Task<AudioInfo> ReadInfoAsync(string filename, CancellationToken cancellationToken = default)
{
using (var metadataReader = CreateMetadata(filename))
{
metadataReader.Start();
var videoInfo = default(AudioInfo);
using (var reader = metadataReader.StandardOutput)
{
videoInfo = ParseInfo(filename, await reader.ReadToEndAsync(cancellationToken));
}
await metadataReader.WaitForExitAsync(cancellationToken);
return videoInfo;
}
}
/// <summary>
/// Parses the information.
/// </summary>
/// <param name="filename">The filename.</param>
/// <param name="jsonString">The json string.</param>
/// <returns>AudioInfo.</returns>
/// <exception cref="System.Exception">Failed to parse audio stream metadata</exception>
private static AudioInfo ParseInfo(string filename, string jsonString)
{
var metadata = JsonSerializer.Deserialize<AudioMetadata>(jsonString);
var stream = metadata.Streams.FirstOrDefault(x => x.Type == "audio");
if (stream is null)
throw new Exception("Failed to parse audio stream metadata");
return new AudioInfo
{
FileName = filename,
AudioCodec = stream.CodecName,
Channels = stream.Channels,
SampleRate = stream.SampleRate,
Samples = stream.SampleCount,
Duration = stream.Duration,
};
}
/// <summary>
/// Creates the audio buffer.
/// </summary>
/// <param name="audioTensor">The audio tensor.</param>
/// <param name="channels">The channels.</param>
/// <param name="samples">The samples.</param>
/// <returns>System.Byte[].</returns>
private static byte[] CreateAudioBuffer(AudioTensor audioTensor, int channels, int samples)
{
int offset = 0;
byte[] buffer = new byte[samples * channels * 4]; // float32 = 4 bytes
for (int i = 0; i < samples; i++)
{
for (int c = 0; c < channels; c++)
{
float sample = Math.Clamp(audioTensor[c, i], -1f, 1f);
byte[] bytes = BitConverter.GetBytes(sample);
Buffer.BlockCopy(bytes, 0, buffer, offset, 4);
offset += 4;
}
}
return buffer;
}
/// <summary>
/// Creates the audio tensor.
/// </summary>
/// <param name="audioBytes">The audio bytes.</param>
/// <param name="channels">The channels.</param>
/// <param name="sampleRate">The sample rate.</param>
/// <returns>AudioTensor.</returns>
private static AudioTensor CreateAudioTensor(byte[] audioBytes, int channels, int sampleRate)
{
// Convert PCM16 -> float32 [-1, 1]
var sampleCount = audioBytes.Length / 2 / channels;
var result = new Tensor<float>([channels, sampleCount]);
for (int i = 0, s = 0; i < audioBytes.Length; i += 2, s++)
{
short sample = BitConverter.ToInt16(audioBytes, i);
float normalized = sample / 32768f;
int channel = s % channels;
int frame = s / channels;
result[channel, frame] = normalized;
}
return result.AsAudioTensor(sampleRate);
}
#region FFMPEG / FFProbe
private static Process CreateProcess(string executable, string arguments)
{
var ffmpegProcess = new Process();
ffmpegProcess.StartInfo.FileName = executable;
ffmpegProcess.StartInfo.Arguments = arguments;
ffmpegProcess.StartInfo.UseShellExecute = false;
ffmpegProcess.StartInfo.CreateNoWindow = true;
return ffmpegProcess;
}
private static Process CreateReader(string inputFile, string audioCodec, int sampleRate, int channels)
{
var process = CreateProcess(FFMpegPath, $"-hide_banner -i \"{inputFile}\" -f s16le -acodec {audioCodec} -ac {channels} -ar {sampleRate} pipe:1");
process.StartInfo.RedirectStandardOutput = true;
return process;
}
private static Process CreateWriter(string audioOutputFile, int sampleRate, int channels)
{
var process = CreateProcess(FFMpegPath, $"-hide_banner -y -f f32le -ac {channels} -ar {sampleRate} -i pipe:0 \"{audioOutputFile}\"");
process.StartInfo.RedirectStandardInput = true;
return process;
}
private static Process CreateMuxer(string targetVideo, string sourceVideo, string tempFile)
{
var process = CreateProcess(FFMpegPath, $"-hide_banner -i \"{targetVideo}\" -i \"{sourceVideo}\" -c:v copy -c:a copy -map 0:v:0 -map 1:a:0 -y \"{tempFile}\"");
process.StartInfo.RedirectStandardInput = true;
return process;
}
private static Process CreateMetadata(string inputFile)
{
var process = CreateProcess(FFProbePath, $"-v quiet -print_format json -show_format -show_streams {inputFile}");
process.StartInfo.RedirectStandardInput = true;
process.StartInfo.RedirectStandardOutput = true;
return process;
}
private record AudioMetadata
{
[JsonPropertyName("format")]
public AudioFormat Format { get; set; }
[JsonPropertyName("streams")]
public List<AudioStream> Streams { get; set; }
}
[JsonNumberHandling(JsonNumberHandling.AllowReadingFromString)]
private record AudioFormat
{
[JsonPropertyName("filename")]
public string FileName { get; set; }
[JsonPropertyName("nb_streams")]
public int StreamCount { get; set; }
[JsonPropertyName("format_name")]
public string FormatName { get; set; }
[JsonPropertyName("format_long_name")]
public string FormatLongName { get; set; }
[JsonPropertyName("size")]
public long Size { get; set; }
[JsonPropertyName("bit_rate")]
public long BitRate { get; set; }
}
[JsonNumberHandling(JsonNumberHandling.AllowReadingFromString)]
private record AudioStream
{
[JsonPropertyName("codec_type")]
public string Type { get; set; }
[JsonPropertyName("codec_name")]
public string CodecName { get; set; }
[JsonPropertyName("codec_long_name")]
public string CodecLongName { get; set; }
[JsonPropertyName("sample_fmt")]
public string SampleFormat { get; set; }
[JsonPropertyName("sample_rate")]
public int SampleRate { get; set; }
[JsonPropertyName("duration_ts")]
public long SampleCount { get; set; }
[JsonPropertyName("channels")]
public int Channels { get; set; }
[JsonPropertyName("bits_per_sample")]
public int BitsPerSample { get; set; }
[JsonPropertyName("bit_rate")]
public int BitRate { get; set; }
[JsonPropertyName("duration")]
public float DurationSeconds { get; set; }
public TimeSpan Duration => TimeSpan.FromSeconds(DurationSeconds);
}
#endregion
}
}
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