public static byte[] SoundFromFileResample(string path, int sampleRate, int channels, ushort sampleFormatSDL, ResampleQuality resampleQuality = ResampleQuality.High)
{
AVSampleFormat targetFormat2;
switch (sampleFormatSDL)
{
case SDL.AUDIO_S16:
targetFormat2 = AVSampleFormat.AV_SAMPLE_FMT_S16;
break;
case SDL.AUDIO_F32:
targetFormat2 = AVSampleFormat.AV_SAMPLE_FMT_FLT;
break;
case SDL.AUDIO_S32:
targetFormat2 = AVSampleFormat.AV_SAMPLE_FMT_S32;
break;
default:
throw new ApplicationException("Could not map SDL audio format to AVSampleFormat: " + sampleFormatSDL.ToString());
}
using (FFmpegContext ffContext = FFmpegContext.Read(path))
{
ffContext.SelectStream(AVMediaType.AVMEDIA_TYPE_AUDIO);
// setup resamplers and other format converters if needed
ffContext.ConvertToFormat(targetFormat2, sampleRate, channels, resampleQuality);
// FFmpeg only approximates stream durations but is
// usually not far from the real duration.
byte[] bytes = new byte[ffContext.audioBytesTotal];
// read all data from frames
long offset = 0;
while (ffContext.ReadFrame())
{
long frameSize = ffContext.GetFrameBufferSize();
if (offset + frameSize > bytes.Length)
{
Array.Resize(ref bytes, (int)(offset + frameSize));
}
offset += ffContext.GetFrameData(ref bytes, (int)offset);
}
return(bytes);
}
}
public static byte[] SoundFromFile(string path, out int sampleRate, out int channels, out ushort sampleFormatSDL)
{
using (FFmpegContext ffContext = FFmpegContext.Read(path))
{
ffContext.SelectStream(AVMediaType.AVMEDIA_TYPE_AUDIO);
sampleRate = ffContext.audioSampleRate;
channels = ffContext.audioChannels;
AVSampleFormat sampleFormat = ffContext.audioSampleFormat;
switch (sampleFormat)
{
case AVSampleFormat.AV_SAMPLE_FMT_S16:
sampleFormatSDL = SDL.AUDIO_S16;
break;
case AVSampleFormat.AV_SAMPLE_FMT_FLT:
sampleFormatSDL = SDL.AUDIO_F32;
break;
case AVSampleFormat.AV_SAMPLE_FMT_S32:
sampleFormatSDL = SDL.AUDIO_S32;
break;
default:
throw new ApplicationException("Could not map AVSampleFormat to SDL audio format: " + sampleFormat.ToString());
}
// FFmpeg only approximates stream durations but is
// usually not far from the real duration.
byte[] bytes = new byte[ffContext.audioBytesTotal];
// read all data from frames
long offset = 0;
while (ffContext.ReadFrame())
{
long frameSize = ffContext.GetFrameBufferSize();
if (offset + frameSize > bytes.Length)
{
Array.Resize(ref bytes, (int)(offset + frameSize));
}
offset += ffContext.GetFrameData(ref bytes, (int)offset);
}
return(bytes);
}
}
public void Dispose()
{
if (ffContext != null)
{
ffContext.Dispose();
}
ffContext = null;
if (loadThread != null)
{
nextFrameEvent.Set();
if (loadThread.IsAlive)
{
loadThread.Join();
}
}
}
public void Start()
{
if (presentedFrames == 0)
{
nextFrameEvent.Set();
return;
}
// TODO: seek back to first frame
ffContext.Dispose();
ffContext = null;
currentTime = 0.0;
presentedFrames = 0;
decodedFrames = 0;
nextFramePts = 0.0;
Load(path);
nextFrameEvent.Set();
}
public static FFmpegContext Write(string path)
{
FFmpegContext context = new FFmpegContext(path);
return(context);
}
