public Stream GetSampleStream(int sampleRate, int channels)
{
if (channels != 1 && channels != 2)
{
throw new ArgumentOutOfRangeException(nameof(channels), "Only 1 or 2 channels are allowed.");
}
using (var reader = new MediaFoundationReader(_path))
{
ISampleProvider sampler = new WdlResamplingSampleProvider(reader.ToSampleProvider(), sampleRate);
switch (channels)
{
case 1:
sampler = sampler.ToMono();
break;
case 2:
sampler = sampler.ToStereo();
break;
}
return(new SamplerWrapper(sampler));
}
}
public async Task <IActionResult> Post([FromForm] string phoneNumber)
{
//1) split number to to get 10 numbers in array
var numsInPhone = phoneNumber.ToCharArray();
//var chunkAudioFiles = new AudioFileReader[10];
var chunkAudioStereo = new ISampleProvider[10];
var backGroundMerger = new ISampleProvider[2];
string contentRootPath = _env.ContentRootPath;
string webRootPath = _env.WebRootPath;
byte[] buffer = new byte[1024];
WaveFileWriter waveFileWriter = null;
var timeRange = new double[10];
string outputFile = webRootPath + "\\app\\AudioFiles\\output.wav";
//string outputFile = contentRootPath + "\\output.wav";
try
{
var counter = 0;
foreach (var num in numsInPhone)
{
//if (counter > 5)
// continue;
WaveFileReader reader = new WaveFileReader(webRootPath + "\\app\\AudioFiles\\file_" + num + ".wav");
if (waveFileWriter == null)
{
// first time in create new Writer
waveFileWriter = new WaveFileWriter(outputFile, reader.WaveFormat);
}
else
{
if (!reader.WaveFormat.Equals(waveFileWriter.WaveFormat))
{
var audio = new WdlResamplingSampleProvider(new AudioFileReader(webRootPath + "\\app\\AudioFiles\\file_" + num + ".wav"), 44100);
reader = (WaveFileReader)audio.ToStereo();
}
}
timeRange[counter] = reader.TotalTime.TotalSeconds;
int read;
if (waveFileWriter.WaveFormat.BitsPerSample == 24)
{
while ((read = reader.Read(buffer, 0, buffer.Length - (buffer.Length % waveFileWriter.WaveFormat.BlockAlign))) > 0)
{
waveFileWriter.Write(buffer, 0, read);
}
}
else
{
while ((read = reader.Read(buffer, 0, buffer.Length)) > 0)
{
waveFileWriter.Write(buffer, 0, read);
}
}
counter++;
}
}
catch (Exception ex)
{
}
finally
{
if (waveFileWriter != null)
{
waveFileWriter.Dispose();
}
}
//var sourceFiles = new List<string>();
//foreach (var num in numsInPhone)
//{
// sourceFiles.Add(webRootPath + "\\app\\AudioFiles\\file_" + num + ".wav");
//}
//Concatenate(outputFile, sourceFiles);
backGroundMerger[0] = new WdlResamplingSampleProvider(new AudioFileReader(webRootPath + "\\app\\AudioFiles\\output.wav"), 44100).ToStereo();
backGroundMerger[1] = new WdlResamplingSampleProvider(new AudioFileReader(webRootPath + "\\app\\AudioFiles\\harmony.wav"), 44100).ToStereo();
var finalAudioName = "YourTone.wav";
// 3) Merge Audios
var mixer = new MixingSampleProvider(backGroundMerger);
WaveFileWriter.CreateWaveFile16(finalAudioName, mixer);
//TODO : Uncomment below and test after 16 bit audio are received
ConvertWavToMp3(finalAudioName, "mixed.mp3");
//TODO : Use generated mp3 after 16 bit audio
// var fileStream = await System.IO.File.ReadAllBytesAsync(finalAudioName);
//// var fileStream = await System.IO.File.ReadAllBytesAsync("mp3_sample.mp3");
// if (fileStream == null)
// return NotFound(); // returns a NotFoundResult with Status404NotFound response.
// return new FileContentResult(fileStream, "audio/mpeg")
// {
// FileDownloadName = outputFile
// };
var memory = new MemoryStream();
using (var stream = new FileStream("mixed.mp3", FileMode.Open, FileAccess.Read, FileShare.Read))
{
await stream.CopyToAsync(memory);
}
memory.Position = 0;
return(File(memory, "audio/mpeg", $"mp3_sample.mp3", true));
}