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AvioContext.cs
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AvioContext.cs
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using System;
using CSCore.Ffmpeg.Interops;
namespace CSCore.Ffmpeg
{
internal sealed class AvioContext : IDisposable
{
// ReSharper disable once PrivateFieldCanBeConvertedToLocalVariable
private readonly FfmpegCalls.AvioReadData _readDataCallback;
private readonly FfmpegCalls.AvioSeek _seekCallback;
private readonly FfmpegCalls.AvioWriteData _writeDataCallback;
private unsafe AVIOContext* _context;
private AvioBuffer _buffer;
// ReSharper restore PrivateFieldCanBeConvertedToLocalVariable
public unsafe IntPtr ContextPtr
{
get { return (IntPtr) _context; }
}
public unsafe AVIOContext Context
{
get
{
if (_context == null)
return default(AVIOContext);
return *_context;
}
}
public AvioContext(
FfmpegCalls.AvioReadData readDataCallback,
FfmpegCalls.AvioSeek seekCallback)
: this(readDataCallback, seekCallback, null)
{
}
public unsafe AvioContext(
FfmpegCalls.AvioReadData readDataCallback,
FfmpegCalls.AvioSeek seekCallback,
FfmpegCalls.AvioWriteData writeDataCallback)
{
_readDataCallback = readDataCallback;
_seekCallback = seekCallback;
_writeDataCallback = writeDataCallback;
//make sure that the buffer won't be disposed
//the buffer may change. we always have to free _context->buffer
_buffer = new AvioBuffer {SuppressAvFree = true};
_context = FfmpegCalls.AvioAllocContext(_buffer, _writeDataCallback != null, IntPtr.Zero,
_readDataCallback, _writeDataCallback, _seekCallback);
}
public unsafe void Dispose()
{
GC.SuppressFinalize(this);
if (_context != null)
{
//free the allocated buffer
//note: the internal buffer could have changed, and be != _buffer
FfmpegCalls.AvFree((IntPtr)_context->buffer);
//free the context itself
FfmpegCalls.AvFree((IntPtr)_context);
_context = null;
}
}
~AvioContext()
{
Dispose();
}
}
}