public async Task <byte[]> ConvertAsync(byte[] content)
{
_environmentVariablesConfig.CheckAddBinPath();
var target = new WaveFormat(8000, 16, 1);
await using var outPutStream = new MemoryStream();
await using var mp3Reader = new Mp3FileReader(new MemoryStream(content));
await using var conversionStream = new WaveFormatConversionStream(target, mp3Reader);
await using var writer = new WaveFileWriter(outPutStream, conversionStream.WaveFormat);
await conversionStream.CopyToAsync(writer);
return(outPutStream.ToArray());
}
/// <summary>
/// Gets the job's media PCM data.
/// </summary>
/// <returns></returns>
static async Task <Tuple <byte[], int> > GetMediaAsWav(Stream src)
{
// convert PCM stream into WAV
using (var dst = new MemoryStream())
using (var pcm = new WaveFileReader(src))
using (var cnv = new WaveFormatConversionStream(new WaveFormat(8000, 16, pcm.WaveFormat.Channels), pcm))
using (var wav = new WaveFileWriter(dst, cnv.WaveFormat))
{
// run the conversion into the memory stream
await cnv.CopyToAsync(wav, 65536 - (65536 % cnv.BlockAlign));
await wav.FlushAsync();
wav.Close();
// execute the recognition
return(Tuple.Create(dst.ToArray(), cnv.WaveFormat.Channels));
}
}