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AvFormatContext.cs
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AvFormatContext.cs
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using System;
using System.Collections.Generic;
using System.Linq;
using CSCore.Ffmpeg.Interops;
namespace CSCore.Ffmpeg
{
internal class AvFormatContext : IDisposable
{
private unsafe AVFormatContext* _formatContext;
private AvStream _stream;
public unsafe IntPtr FormatPtr
{
get { return (IntPtr) _formatContext; }
}
public int BestAudioStreamIndex { get; private set; }
public AvStream SelectedStream
{
get { return _stream; }
}
public unsafe bool CanSeek
{
get
{
if (_formatContext == null || _formatContext->pb == null)
return false;
return _formatContext->pb->seekable == 1;
}
}
public double LengthInSeconds
{
get
{
if (SelectedStream == null || SelectedStream.Stream.duration < 0)
return 0;
var timebase = SelectedStream.Stream.time_base;
if (timebase.den == 0)
return 0;
return SelectedStream.Stream.duration * timebase.num / (double) timebase.den;
}
}
public unsafe AVFormatContext FormatContext
{
get
{
if (_formatContext == null)
return default(AVFormatContext);
return *_formatContext;
}
}
public Dictionary<string,string> Metadata { get; private set; }
public unsafe AvFormatContext(FfmpegStream stream)
{
_formatContext = FfmpegCalls.AvformatAllocContext();
fixed (AVFormatContext** pformatContext = &_formatContext)
{
FfmpegCalls.AvformatOpenInput(pformatContext, stream.AvioContext);
}
Initialize();
}
public unsafe AvFormatContext(string url)
{
_formatContext = FfmpegCalls.AvformatAllocContext();
fixed (AVFormatContext** pformatContext = &_formatContext)
{
FfmpegCalls.AvformatOpenInput(pformatContext, url);
}
Initialize();
}
private unsafe void Initialize()
{
FfmpegCalls.AvFormatFindStreamInfo(_formatContext);
BestAudioStreamIndex = FfmpegCalls.AvFindBestStreamInfo(_formatContext);
_stream = new AvStream((IntPtr)_formatContext->streams[BestAudioStreamIndex]);
Metadata = new Dictionary<string, string>();
if (_formatContext->metadata != null)
{
var metadata = _formatContext->metadata->Elements;
foreach (var element in metadata)
{
Metadata.Add(element.Key, element.Value);
}
}
}
public void SeekFile(double seconds)
{
var streamTimeBase = SelectedStream.Stream.time_base;
var time = seconds * streamTimeBase.den / streamTimeBase.num;
FfmpegCalls.AvFormatSeekFile(this, time);
}
public unsafe void Dispose()
{
GC.SuppressFinalize(this);
if (SelectedStream != null)
{
SelectedStream.Dispose();
_stream = null;
}
if (_formatContext != null)
{
fixed (AVFormatContext** pformatContext = &_formatContext)
{
FfmpegCalls.AvformatCloseInput(pformatContext);
}
_formatContext = null;
BestAudioStreamIndex = 0;
}
}
~AvFormatContext()
{
Dispose();
}
}
}