mpeg2t_bytestream.h

网络MPEG4IP流媒体开发源代码

/*
 * The contents of this file are subject to the Mozilla Public
 * License Version 1.1 (the "License"); you may not use this file
 * except in compliance with the License. You may obtain a copy of
 * the License at http://www.mozilla.org/MPL/
 * 
 * Software distributed under the License is distributed on an "AS
 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * rights and limitations under the License.
 * 
 * The Original Code is MPEG4IP.
 * 
 * The Initial Developer of the Original Code is Cisco Systems Inc.
 * Portions created by Cisco Systems Inc. are
 * Copyright (C) Cisco Systems Inc. 2000, 2001.  All Rights Reserved.
 * 
 * Contributor(s): 
 *              Bill May        [e-mail]
 */
/*
 * mp4_bytestream.h - provides bytestream access to quicktime files
 */

#ifndef __MPEG2T_BYTESTREAM_H__
#define __MPEG2T_BYTESTREAM_H__
#include "our_bytestream.h"
#include "player_util.h"
#include "mpeg2t_private.h"
#include "mpeg2t/mpeg2_transport.h"
//#define OUTPUT_TO_FILE 1

/*
 * CMpeg2tByteStreamBase provides base class access to quicktime files.
 * Most functions are shared between audio and video.
 */
class CMpeg2tByteStream : public COurInByteStream
{
 public:
  CMpeg2tByteStream(mpeg2t_es_t *es_pid,
		    const char *type,
		    int has_video);
  ~CMpeg2tByteStream();
  int eof(void);
  void reset(void);
  int have_no_data(void);
  uint64_t start_next_frame(uint8_t **buffer,
			    uint32_t *buflen,
			    void **ud);
  void used_bytes_for_frame(uint32_t bytes);
  int can_skip_frame(void) { return 1; };
  int skip_next_frame(uint64_t *ts, int *hasSyncFrame, uint8_t **buffer,
		      uint32_t *buflen, void **ud);
  void check_for_end_of_frame(void);
  double get_max_playtime(void);

  void play(uint64_t start);
  void pause(void);
 protected:
#ifdef OUTPUT_TO_FILE
  FILE *m_output_file;
#endif
  int m_has_video;
  mpeg2t_es_t *m_es_pid;
  virtual int get_timestamp_for_frame(mpeg2t_frame_t *, uint64_t &ts) = 0;
  mpeg2t_frame_t *m_frame;
  int m_timestamp_loaded;
  uint64_t m_last_timestamp;
  int m_frames_since_last_timestamp;
};

/*
 * CMp4VideoByteStream is for video streams.  It is inherited from
 * CMpeg2tByteStreamBase.
 */
class CMpeg2tVideoByteStream : public CMpeg2tByteStream
{
 public:
  CMpeg2tVideoByteStream(mpeg2t_es_t *es_pid) :
    CMpeg2tByteStream(es_pid, "video", 1) {
    m_have_prev_frame_type = 0;
  };
 protected:
  int get_timestamp_for_frame(mpeg2t_frame_t *, uint64_t &ts);
  int m_have_prev_frame_type;
  int m_prev_frame_type;
  uint64_t m_prev_ts;
};

/*
 * CMp4AudioByteStream is for audio streams.  It is inherited from
 * CMpeg2tByteStreamBase.
 */
class CMpeg2tAudioByteStream : public CMpeg2tByteStream
{
 public:
  CMpeg2tAudioByteStream(mpeg2t_es_t *es_pid) :
    CMpeg2tByteStream(es_pid, "audio", 0) {};
 protected:
  int get_timestamp_for_frame(mpeg2t_frame_t *, uint64_t &ts);

};

#endif