public IntPtr WriteStream(IMagickImage image, MagickSettings settings, ReadWriteStreamDelegate reader, ReadWriteStreamDelegate writer, SeekStreamDelegate seeker, TellStreamDelegate teller)
{
using (INativeInstance settingsNative = MagickSettings.CreateInstance(settings))
{
IntPtr exception = IntPtr.Zero;
IntPtr result;
#if PLATFORM_AnyCPU
if (NativeLibrary.Is64Bit)
#endif
#if PLATFORM_x64 || PLATFORM_AnyCPU
result = NativeMethods.X64.MagickImageCollection_WriteStream(image.GetInstance(), settingsNative.Instance, reader, writer, seeker, teller, out exception);
#endif
#if PLATFORM_AnyCPU
else
#endif
#if PLATFORM_x86 || PLATFORM_AnyCPU
result = NativeMethods.X86.MagickImageCollection_WriteStream(image.GetInstance(), settingsNative.Instance, reader, writer, seeker, teller, out exception);
#endif
MagickException magickException = MagickExceptionHelper.Create(exception);
if (MagickExceptionHelper.IsError(magickException))
{
if (result != IntPtr.Zero)
{
Dispose(result);
}
throw magickException;
}
RaiseWarning(magickException);
return(result);
}
}
public void WriteStream(IMagickImage image, MagickSettings settings, ReadWriteStreamDelegate writer, SeekStreamDelegate seeker, TellStreamDelegate teller, ReadWriteStreamDelegate reader)
{
using (INativeInstance settingsNative = MagickSettings.CreateInstance(settings))
{
IntPtr exception = IntPtr.Zero;
#if PLATFORM_AnyCPU
if (NativeLibrary.Is64Bit)
#endif
#if PLATFORM_x64 || PLATFORM_AnyCPU
NativeMethods.X64.MagickImageCollection_WriteStream(image.GetInstance(), settingsNative.Instance, writer, seeker, teller, reader, out exception);
#endif
#if PLATFORM_AnyCPU
else
#endif
#if PLATFORM_x86 || PLATFORM_AnyCPU
NativeMethods.X86.MagickImageCollection_WriteStream(image.GetInstance(), settingsNative.Instance, writer, seeker, teller, reader, out exception);
#endif
CheckException(exception);
}
}
public static extern IntPtr MagickImageCollection_WriteStream(IntPtr image, IntPtr settings, ReadWriteStreamDelegate reader, ReadWriteStreamDelegate writer, SeekStreamDelegate seeker, TellStreamDelegate teller, out IntPtr exception);
private void OpenInput()
{
formatContext = ffmpeg.avformat_alloc_context();
fixed(AVFormatContext **formatContextPtr = &formatContext)
{
int error;
AVInputFormat *inputFormat = null;
if (stream != null)
{
const int bufferSize = 8192;
// with delegates and anonymous functions, we can capture
// the local stream variable without passing it as a argument.
ReadStreamDelegate readStream = (IntPtr opaque, IntPtr buf, int buf_size) =>
{
byte[] array = new byte[buf_size];
int read = stream.Read(array, 0, buf_size);
Marshal.Copy(array, 0, buf, read);
return(read);
};
SeekStreamDelegate seekStream = (IntPtr opaque, Int64 offset, int whence) =>
{
if (whence == ffmpeg.AVSEEK_SIZE)
{
return(stream.Length);
}
if (!stream.CanSeek)
{
return(-1);
}
stream.Seek(offset, (SeekOrigin)whence);
return(stream.Position);
};
// track the delegates, GC might remove them prematurely
delegateRefs.Add(readStream);
delegateRefs.Add(seekStream);
// setup custom stream reader for ffmpeg to use with AVIO context
sbyte *readBuffer = (sbyte *)ffmpeg.av_malloc(bufferSize + ffmpeg.FF_INPUT_BUFFER_PADDING_SIZE);
avioContext = ffmpeg.avio_alloc_context(readBuffer, bufferSize, 0, null,
Marshal.GetFunctionPointerForDelegate(readStream), IntPtr.Zero,
Marshal.GetFunctionPointerForDelegate(seekStream));
formatContext->pb = avioContext;
formatContext->flags |= ffmpeg.AVFMT_FLAG_CUSTOM_IO;
if ((error = ffmpeg.av_probe_input_buffer(formatContext->pb, &inputFormat, path, null, 0, 0)) != 0)
{
throw new FFmpegException(error);
}
if (path != null && (inputFormat->flags & ffmpeg.AVFMT_NOFILE) != 0)
{
// Input format (image2) doesn't support custom AVIOContext,
// forcefully clear the flag and hope it works.
inputFormat->flags &= ~ffmpeg.AVFMT_NOFILE;
//ffmpeg.avio_close(formatContext->pb);
}
}
if ((error = ffmpeg.avformat_open_input(formatContextPtr, path, inputFormat, null)) != 0)
{
throw new FFmpegException(error, "Failed to open input stream for file '" + path + "'");
}
}
frame = ffmpeg.av_frame_alloc();
}
