public TimeSpan Seek(TimeSpan offset, SeekOrigin origin)
{
TimeSpan newPosition = TimeSpan.Zero;
switch (origin)
{
case SeekOrigin.Begin:
newPosition = offset;
break;
case SeekOrigin.Current:
newPosition = offset + Timestamp;
break;
case SeekOrigin.End:
newPosition = Duration - Timestamp;
break;
}
if (newPosition < TimeSpan.Zero)
{
newPosition = TimeSpan.Zero;
}
else if (newPosition > Duration)
{
newPosition = Duration;
}
bool backward = newPosition > Timestamp;
AVSEEK_FLAG flags = AVSEEK_FLAG.Any | (backward ? AVSEEK_FLAG.Backward: 0);
long position = (long)(newPosition.TotalSeconds * FFmpeg.AV_TIME_BASE);
if (FFmpeg.av_seek_frame(ref m_file.FormatContext, -1, position, flags) < 0)
{
m_position = Length;
m_timestamp = Duration;
return(Duration);
}
FFmpeg.avcodec_flush_buffers(ref m_avCodecCtx);
m_timestamp = offset;
m_position = (long)(m_timestamp.TotalSeconds * UncompressedBytesPerSecond);
return(m_timestamp);
}
public static extern AVError av_seek_frame_binary(ref AVFormatContext pAVFormatContext, int stream_index, long target_ts, AVSEEK_FLAG flags);
public static extern AVError av_index_search_timestamp(ref AVStream pAVStream, long timestamp, AVSEEK_FLAG flags);
public static extern AVError av_seek_frame(ref AVFormatContext pAVFormatContext, int stream_index, long timestamp, AVSEEK_FLAG flags);
public static extern AVError av_add_index_entry(ref AVStream pAVStream, long pos, long timestamp, int size, int distance, AVSEEK_FLAG flags);
public static extern AVError av_add_index_entry(ref AVStream pAVStream, long pos, long timestamp, int size, int distance, AVSEEK_FLAG flags);
public static extern AVError av_index_search_timestamp(ref AVStream pAVStream, long timestamp, AVSEEK_FLAG flags);
public static extern AVError av_seek_frame(ref AVFormatContext pAVFormatContext, int stream_index, long timestamp, AVSEEK_FLAG flags);
public static extern AVError av_seek_frame_binary(ref AVFormatContext pAVFormatContext, int stream_index, long target_ts, AVSEEK_FLAG flags);
