protected override bool DecodeDataCore(int target_size, out byte[] out_data, out int out_size)
{
out_size = 0;
out_data = new byte[target_size + 65535];
int total_decode = 0;
int remain = target_size;
while (true)
{
int done = 0;
byte[] tmpbuf = new byte[remain];
IntPtr tmpptr = Marshal.UnsafeAddrOfPinnedArrayElement(tmpbuf, 0);
int ret = mpg123.mpg123_read(this.mpg123Handle, tmpptr, tmpbuf.Length, out done);
if (done == 0 && ret == mpg123.MPG123_ERR)
{
logger.ErrorFormat("mpg123_read失败, {0}", ret);
return(false);
}
Buffer.BlockCopy(tmpbuf, 0, out_data, total_decode, done);
total_decode += done;
remain -= done;
/* 解码的数据不够，继续解析音频帧然后解码 */
if (total_decode < target_size)
{
AudioDemuxPacket packet = null;
if (!this.demuxer.DemuxNextPacket <AudioDemuxPacket>(out packet))
{
return(false);
}
IntPtr frameptr = Marshal.UnsafeAddrOfPinnedArrayElement(packet.Data, 0);
if ((ret = mpg123.mpg123_feed(this.mpg123Handle, frameptr, packet.Data.Length)) != mpg123.MPG123_OK)
{
return(false);
}
}
else
{
return(true);
}
}
}
public override bool Open(AbstractAVDemuxer demuxer)
{
#region 初始化mpg123句柄
int error;
if ((this.mpg123Handle = mpg123.mpg123_new(IntPtr.Zero, out error)) == IntPtr.Zero)
{
logger.ErrorFormat("mpg123_new失败, {0}", error);
return(false);
}
if ((error = mpg123.mpg123_open_feed(this.mpg123Handle)) != mpg123.MPG123_OK)
{
logger.ErrorFormat("mpg123_open_feed失败, {0}", error);
return(false);
}
#endregion
#region 探测流格式
IntPtr container_hdr_ptr = Marshal.UnsafeAddrOfPinnedArrayElement(demuxer.ContainerHeader, 0);
if ((error = mpg123.mpg123_feed(this.mpg123Handle, container_hdr_ptr, demuxer.ContainerHeader.Length)) != mpg123.MPG123_OK)
{
logger.ErrorFormat("mpg123_feed ContainerHeader失败, {0}", error);
return(false);
}
/* 如果当前没有解析数据帧，则读取一帧数据 */
AudioDemuxPacket packet = null;
if (demuxer.CurrentPacket == null)
{
if (!demuxer.DemuxNextPacket <AudioDemuxPacket>(out packet))
{
logger.ErrorFormat("NextPacket失败");
return(false);
}
}
int total_probe_times = 0;
int rate, channel, encoding;
do
{
IntPtr frameptr = Marshal.UnsafeAddrOfPinnedArrayElement(packet.Data, 0);
if ((error = mpg123.mpg123_feed(this.mpg123Handle, frameptr, packet.Data.Length)) != mpg123.MPG123_OK)
{
logger.ErrorFormat("feed数据失败, {0}", error);
return(false);
}
if (total_probe_times++ > MAX_PROBE_TIMES)
{
logger.ErrorFormat("Open超时");
return(false);
}
}while ((error = mpg123.mpg123_getformat(this.mpg123Handle, out rate, out channel, out encoding)) != mpg123.MPG123_OK);
logger.InfoFormat("OpenDemuxer成功, rate={0}, channel={1}, encoding={2}", rate, channel, encoding);
#endregion
this.demuxer = demuxer;
return(true);
}
