public Stream EncodeAsOggOpus(Stream audioStream)
{
var oggStream = new MemoryStream();
logger.LogInformation("Transcoding audio stream to ogg");
logger.LogDebug($"Transcoding with {config.Music.EncodingSampleRate} samples and {config.Music.EncodingBitrate} bits per second");
try
{
using (var inputStream = new AVIOStream(audioStream, FileAccess.Read))
using (var inputCtx = new InputContext(inputStream))
using (var decoder = new AudioDecoder(inputCtx))
using (var outputStream = new AVIOStream(oggStream, FileAccess.Write))
using (var outputCtx = new OutputContext(outputStream))
{
outputCtx.GuessOutputFormat(null, ".ogg", null);
using (var encoder = new AudioEncoder(outputCtx, FFmpeg.AutoGen.AVCodecID.AV_CODEC_ID_OPUS, config.Music.EncodingSampleRate, 2, config.Music.EncodingBitrate))
using (var transcoder = new AudioTranscoder(encoder, decoder))
{
outputCtx.WriteFileHeader();
transcoder.Transcode(true);
outputCtx.WriteFileTrailer();
logger.LogDebug("Transcoding finished");
}
}
oggStream.Position = 0;
return(oggStream);
}
catch (Exception ex)
{
logger.LogError(ex, "Exception while transcoding audio stream");
oggStream.Dispose();
return(null);
}
}