public static SnmFile FromAviFile(string fileName)
{
if (!File.Exists(fileName))
{
throw new FileNotFoundException();
}
var snm = new SnmFile();
var aviManager = new AviManager(fileName);
try
{
AudioStream audioStream = aviManager.GetWaveStream();
byte[] audioData = null;
if (audioStream != null)
{
if (audioStream.ChannelsCount != 2 || audioStream.BitsPerSample != 16)
{
throw new InvalidDataException();
}
if (audioStream.SamplesPerSecond != 22050 && audioStream.SamplesPerSecond != 44100)
{
throw new NotSupportedException();
}
snm.AudioHeader = new SnmAudioHeader
{
Frequency = audioStream.SamplesPerSecond,
NumChannels = audioStream.ChannelsCount
};
audioData = audioStream.GetStreamData();
if (snm.AudioHeader.Frequency == 44100)
{
snm.AudioHeader.Frequency = 22050;
audioData = SnmFile.ConvertAudio44100To22050(audioData);
}
}
VideoStream videoStream = aviManager.GetVideoStream();
if (videoStream.BitsPerPixel != 24 && videoStream.BitsPerPixel != 32)
{
throw new NotSupportedException();
}
snm.Header.FrameDelay = (int)(1000000 / videoStream.FrameRate + 0.5);
snm.Header.Width = (short)videoStream.Width;
snm.Header.Height = (short)videoStream.Height;
snm.Header.NumFrames = (short)videoStream.FramesCount;
for (int i = 0; i < videoStream.FramesCount; i++)
{
snm.VideoHeaders.Add(new SnmVideoHeader
{
Width = snm.Header.Width,
Height = snm.Header.Height
});
}
videoStream.GetFrameOpen();
try
{
int fps = (1000000 + snm.Header.FrameDelay / 2) / snm.Header.FrameDelay;
int samplesPerFrame = snm.AudioHeader.Frequency / fps;
if (samplesPerFrame * fps != snm.AudioHeader.Frequency)
{
throw new InvalidDataException();
}
for (int i = 0; i < videoStream.FramesCount; i++)
{
byte[] videoData = videoStream.GetFrameData(i);
var frame = new SnmFrame();
if (audioData != null)
{
int audioPosition = i * samplesPerFrame * 4;
int audioLength = Math.Min(samplesPerFrame * 4, audioData.Length - audioPosition);
if (audioPosition < audioData.Length && audioLength != 0)
{
frame.Audio = new SnmAudioFrame
{
NumSamples = audioLength / 4
};
byte[] buffer = new byte[audioLength];
Array.Copy(audioData, audioPosition, buffer, 0, audioLength);
//frame.Audio.Data = Imc.Vima.Compress(buffer, 2);
frame.Audio.Data = buffer;
}
}
if (videoData != null)
{
frame.Video = new SnmVideoFrame
{
Width = snm.Header.Width,
Height = snm.Header.Height,
RleOutputSize = snm.Header.Width * snm.Header.Height * 2,
SubcodecId = (byte)videoStream.BitsPerPixel,
Data = videoData
};
//byte[] buffer;
//if (videoStream.BitsPerPixel == 24)
//{
// buffer = SnmFile.Convert24BppTo16Bpp(videoData);
//}
//else
//{
// buffer = SnmFile.Convert32BppTo16Bpp(videoData);
//}
//byte subcodecId;
//frame.Video.Data = Blocky16.Compress(buffer, out subcodecId);
//frame.Video.SubcodecId = subcodecId;
}
snm.Frames.Add(frame);
}
}
finally
{
videoStream.GetFrameClose();
}
}
finally
{
aviManager.Close();
}
snm.Frames
.AsParallel()
.ForAll(frame =>
{
if (frame.Audio != null)
{
frame.Audio.Data = Imc.Vima.Compress(frame.Audio.Data, 2);
}
if (frame.Video != null)
{
byte[] buffer;
if (frame.Video.SubcodecId == 24)
{
buffer = SnmFile.Convert24BppTo16Bpp(frame.Video.Data);
}
else
{
buffer = SnmFile.Convert32BppTo16Bpp(frame.Video.Data);
}
frame.Video.Data = Blocky16.Compress(buffer, out byte subcodecId);
frame.Video.SubcodecId = subcodecId;
}
});
return(snm);
}