av_play.h

一个两碟控制的VCD的代码,两碟之间的转动及连续播放,已大量生产的CODE.

/* Copyright 1996, ESS Technology, Inc.					*/
/* SCCSID @(#)av_play.h	1.4 12/3/97 */

/*
 * $Log$
 */

#ifndef __AV_PLAY_H__
#define __AV_PLAY_H__

/*------------------------------------------------------------------------
 Function prototypes
------------------------------------------------------------------------*/
/* NORMAL MODE */
int av_play_cdda_audio(int track_start, int start_mmssff, int end_mmssff);
int av_play_motion_video(int start_mmssff, int end_mmssff);
int av_play_still(int start_mmssff, int end_mmssff, int type);

/* TRICK MODE */
int av_play_slow_motion(int field_number);
int av_play_fast_forwart(int skip_mmssff, int end_mmssff);
int av_play_fast_rewind(int skip_mmssff, int end_mmssff);
int av_play_pause();

/* RETURN TO NORMAL MODE FROM TRICK MODE */
int av_play_resume();

/* clear decoder buffer */
void clear_dec(void);
void av_play_video_only();
void av_play_audio_only();
void av_mute_audio(int flag);	/* 0 -> not mute, otherwise mute */

void av_reset();	/* is called when we try to stop decoding. */
int reset_video_mode();

#ifdef DVD_VCD
void av_sys_power_down();
#endif
/*------------------------------------------------------------------------
   Global Variables
------------------------------------------------------------------------*/
extern int	   vcx_fast_speed_done;

/*------------------------------------------------------------------------
  Function: av_play_cdda_audio

  Parameters:
      start_mmssff : 
          the start time in BCD's minute, second and frame format.
      end_mmssff:
          the end time in BCD's minute, second and frame format.

  Description:
      This function will play a section of audio CD from start_mmssff
      to end_mmssff. When this section is finish, the end_of_play
      variable will be set to 1.
--------------------------------------------------------------------------
  Function: av_play_motion_video

  Parameters:
      start_mmssff : 
          the start time in BCD's minute, second and frame format.
      end_mmssff:
          the end time in BCD's minute, second and frame format.

  Description:
      This function will play a section of motion video from start_mmssff
      to end_mmssff. When this section is finish, the end_of_play
      variable will be set to 1.
-------------------------------------------------------------------------
  Function: av_play_still

  Parameters:
      start_mmssff : 
          the start time in BCD's minute, second and frame format.
      end_mmssff:
          the end time in BCD's minute, second and frame format.
      type : value should be "0xe1" or "0xe2".
  Description:
      This function will play a section of still video from start_mmssff
      to end_mmssff. When this section is finish, the end_of_play
      variable will be set to 1.
--------------------------------------------------------------------------
  Function:av_play_pause 

  Description:
      This function will pause the playing section.
--------------------------------------------------------------------------
  Function: av_play_resume

  Description:
      This function will take the player from trick mode to normal
      mode.

      trick mode includes FF/FR, slow motion, step and pause.
--------------------------------------------------------------------------
  Function: av_play_slow_motion

  Parameters:
      field_length : The number of field time that a picture should be
                     display. For a normal speed NTSC picture, the
		     field_length is 2. If we want to make the slow
		     motion to 1/2 speed of normal speed, we need to
		     set field_length value to 4.

  Description:
      Plays slow motion.
--------------------------------------------------------------------------
  Function: av_play_mute

  Parameters:
      flag :	The audio will be mute if the flag value is not 0.

  Description:
--------------------------------------------------------------------------
  Function:av_play_step
  Description:
      When this function is called, the player will display a new 
      decoded picture.
--------------------------------------------------------------------------
  Function: av_play_fast_forward/av_play_fast_rewind

  Parameters:
      mmssff:	The jump time after an I frame is displayed. The format
                of mmssff is BCD's 0xmmssff format.

      end_mmssff: When the end_mmssff is played, the vcx_fast_speed_done
                  variable will be set to 1. The called should check
		  this variable and decide what to do.

  Description:
      This function will cause the decoder to a fast forward/rewind  mode.
--------------------------------------------------------------------------

------------------------------------------------------------------------*/


#endif