public MediaReader(Stream stream, InFormat iformat = null, MediaDictionary options = null)
{
baseStream = stream;
avio_Alloc_Context_Read_Packet = ReadFunc;
avio_Alloc_Context_Seek = SeekFunc;
pFormatContext = ffmpeg.avformat_alloc_context();
pFormatContext->pb = ffmpeg.avio_alloc_context((byte *)ffmpeg.av_malloc(bufferLength), bufferLength, 0, null,
avio_Alloc_Context_Read_Packet, null, avio_Alloc_Context_Seek);
fixed(AVFormatContext **ppFormatContext = &pFormatContext)
{
ffmpeg.avformat_open_input(ppFormatContext, null, iformat, options).ThrowExceptionIfError();
}
ffmpeg.avformat_find_stream_info(pFormatContext, null).ThrowExceptionIfError();
base.Format = iformat ?? new InFormat(pFormatContext->iformat);
for (int i = 0; i < pFormatContext->nb_streams; i++)
{
AVStream * pStream = pFormatContext->streams[i];
MediaDecode codec = MediaDecode.CreateDecode(pStream->codecpar->codec_id, _ =>
{
ffmpeg.avcodec_parameters_to_context(_, pStream->codecpar);
});
streams.Add(new MediaStream(pStream)
{
Codec = codec
});
}
}
/// <summary>
/// init format demuxer by name
/// </summary>
/// <param name="name">e.g. mov,mp4 ...</param>
public InFormat(string name)
{
unsafe
{
if (!string.IsNullOrEmpty(name))
{
void * ifmtOpaque = null;
AVInputFormat *iformat;
while ((iformat = ffmpeg.av_demuxer_iterate(&ifmtOpaque)) != null)
{
InFormat format = new InFormat(iformat);
// e.g. format.Name == "mov,mp4,m4a,3gp,3g2,mj2"
string[] names = format.Name.Split(new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries);
foreach (var item in names)
{
if (item == name.ToLower())
{
pInputFormat = iformat;
return;
}
}
}
}
throw new FFmpegException(ffmpeg.AVERROR_DEMUXER_NOT_FOUND);
}
}
/// <summary>
/// Load path
/// </summary>
/// <param name="url"></param>
/// <param name="iformat"></param>
/// <param name="options"></param>
public MediaReader(string url, InFormat iformat = null, MediaDictionary options = null)
{
unsafe
{
fixed(AVFormatContext **ppFormatContext = &pFormatContext)
{
ffmpeg.avformat_open_input(ppFormatContext, url, iformat, options).ThrowExceptionIfError();
}
ffmpeg.avformat_find_stream_info(pFormatContext, null).ThrowExceptionIfError();
base.Format = iformat ?? new InFormat(pFormatContext->iformat);
for (int i = 0; i < pFormatContext->nb_streams; i++)
{
AVStream * pStream = pFormatContext->streams[i];
MediaDecode codec = MediaDecode.CreateDecode(pStream->codecpar->codec_id, _ =>
{
ffmpeg.avcodec_parameters_to_context(_, pStream->codecpar);
});
streams.Add(new MediaStream(pStream)
{
Codec = codec
});
}
}
}
/// <summary>
/// Load stream, default buffer size is 4096
/// </summary>
/// <param name="stream"></param>
/// <param name="iformat"></param>
/// <param name="options"></param>
public MediaReader(Stream stream, InFormat iformat = null, MediaDictionary options = null)
: this(stream, 4096, iformat, options)
{
}
