/// <summary>
/// Allocates all the structures needed to read an input stream.
/// This does not open the needed codecs for decoding the stream[s].
/// </summary>
private static AVError av_open_input_stream(out AVFormatContext ctx, ref ByteIOContext pb,
string filename, ref AVInputFormat fmt, ref AVFormatParameters ap)
{
AVFormatContext* ptr;
AVError err = av_open_input_stream(out ptr, ref pb, filename, ref fmt, ref ap);
ctx = *ptr;
FFmpeg.av_free(ptr);
return err;
}
private static extern AVError av_open_input_stream(out AVFormatContext* ic_ptr, ref ByteIOContext pb,
string filename, ref AVInputFormat fmt, ref AVFormatParameters ap);
public static extern AVError av_set_parameters(ref AVFormatContext pAVFormatContext, AVFormatParameters* pAVFormatParameters);
private static extern AVError av_open_input_file(out IntPtr pFormatContext,
string filename,
ref AVInputFormat fmt,
int buf_size,
ref AVFormatParameters ap);
/// <summary>
/// Opens a media file as input. The codecs are not opened. Only the file
/// header (if present) is read.
/// </summary>
/// <param name="pFormatContext">the opened media file handle is put here</param>
/// <param name="filename">filename to open</param>
/// <param name="pAVInputFormat">if non null, force the file format to use</param>
/// <param name="buf_size">optional buffer size (zero as default is OK)</param>
/// <param name="pAVFormatParameters">Additional parameters needed when open the file (Null if default)</param>
/// <returns>AVError</returns>
public static AVError av_open_input_file(out AVFormatContext pFormatContext, string filename,
ref AVInputFormat fmt, int buf_size, ref AVFormatParameters ap)
{
IntPtr ptr;
AVError err = av_open_input_file(out ptr, filename, ref fmt, 0, ref ap);
if (ptr == IntPtr.Zero)
{
pFormatContext = new AVFormatContext();
return err;
}
pFormatContext = *(AVFormatContext*)ptr.ToPointer();
FFmpeg.av_freep(ref ptr);
return err;
}
