mp4_parser_audio_utility.c

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/*****************************************************************************
 *
 * Filename:
 * ---------
 *   mp4_parser_audio_utility.c
 *
 * Project:
 * --------
 *   Maui_Software
 *
 * Description:
 * ------------
 *  Platform-Depedent MPEG-4 Parser Audio Utility Functions
 *
 * Author:
 * -------
 * -------
 *
 *============================================================================
 *             HISTORY
 * Below this line, this part is controlled by PVCS VM. DO NOT MODIFY!!
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 *------------------------------------------------------------------------------
 * Upper this line, this part is controlled by PVCS VM. DO NOT MODIFY!!
 *============================================================================
 ****************************************************************************/

#include "mp4_parser.h"

Media_Format MP4_Audio_Type_To_Media_Format(MP4_Audio_Type eAudioType)
{
   Media_Format eAudioFormat;

   switch(eAudioType) {
      case MP4_AUDIO_AAC:
         eAudioFormat = MEDIA_FORMAT_AAC;
         break;
      case MP4_AUDIO_AMR:
         eAudioFormat = MEDIA_FORMAT_AMR;
         break;
      case MP4_AUDIO_AMR_WB:
         eAudioFormat = MEDIA_FORMAT_AMR_WB;
         break;
      case MP4_AUDIO_NONE:
         eAudioFormat = MEDIA_FORMAT_AMR;
         break;
   }
   return eAudioFormat;
}

/*
   Get audio playback time in mili-second.
*/
MP4_Parser_Status MP4_Audio_GetPlayTime(STMp4Parser *pstMp4Parser, kal_uint64 *puMiliSecond, kal_uint32 speed_scale )
{
   kal_uint32 uAudioInterruptCount;
   kal_uint32 uAudioInterruptTimeScale;
   kal_uint64 uPreviousTime;
   Media_Format eFormat;

   MP4_PARSER_CHECK_ARG(pstMp4Parser!=NULL);
   MP4_PARSER_CHECK_ARG(puMiliSecond!=NULL);

   uPreviousTime = *puMiliSecond;
   eFormat = MP4_Audio_Type_To_Media_Format( pstMp4Parser->bAudioType );
   uAudioInterruptTimeScale = Media_A2V_GetAudioInterruptTimeScale( eFormat, pstMp4Parser->bAudioSamplingFreqIndex );
   uAudioInterruptCount = Media_A2V_GetInterruptCount();
   *puMiliSecond = pstMp4Parser->uAudioSeekPointTime + uAudioInterruptCount * speed_scale * 10 / uAudioInterruptTimeScale;
   return MP4_PARSER_OK;
}

/*
   Get video playback time in mili-second.
*/
MP4_Parser_Status MP4_GetPlayTime(STMp4Parser *pstMp4Parser, kal_uint64 *puMiliSecond, kal_uint32 speed_scale )
{
   kal_uint32 uCurrentInterruptCount;
   kal_uint32 uAudioInterruptTimeScale;
   Media_Format eFormat;

   MP4_PARSER_CHECK_ARG(pstMp4Parser!=NULL);
   MP4_PARSER_CHECK_ARG(puMiliSecond!=NULL);

   eFormat = MP4_Audio_Type_To_Media_Format( pstMp4Parser->bAudioType );
   uAudioInterruptTimeScale = Media_A2V_GetAudioInterruptTimeScale( eFormat, pstMp4Parser->bAudioSamplingFreqIndex );

   uCurrentInterruptCount = Media_A2V_GetInterruptCount();
   if( uCurrentInterruptCount < pstMp4Parser->uPreviousInterruptCount )
      pstMp4Parser->uPreviousInterruptCount = uCurrentInterruptCount;
   *puMiliSecond = pstMp4Parser->uPlaybackTimeBase + ( uCurrentInterruptCount - pstMp4Parser->uPreviousInterruptCount ) * speed_scale * 10 / uAudioInterruptTimeScale;

   pstMp4Parser->uPlaybackTimeBase = *puMiliSecond;
   pstMp4Parser->uPreviousInterruptCount = uCurrentInterruptCount;

   return MP4_PARSER_OK;
}

/*
   Set the playback timer base to the given time.
   The playback time will be accumulated based on the timer base.
   Playback timer should only be set when AV sync is not activated yet.
*/
void MP4_SetPlaybackTimerBase(STMp4Parser *pstMp4Parser, kal_uint32 uPlaybackTimeBase, kal_bool bResetPreviousInterruptCount)
{
   pstMp4Parser->uPlaybackTimeBase = uPlaybackTimeBase;
   if (bResetPreviousInterruptCount)
   	pstMp4Parser->uPreviousInterruptCount = 0;
}