DECODER_main.c File Reference

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Detailed Description

This module provides decoder interface handle.

REVISION

• 11/05/2003 M.GAO
  Initial creation.
• 01/15/2004 M.GAO
  Send SENDOFMUSIC message to child UI to properly shut down pop up window if there is any.
• 03/04/2004 M.GAO
  Use coder flag to denote EOF to prevent decoder flag corruption, decoder flag is normally only used from DECODER task, while F_CODER_DEC_EOF can be used from media task.

Definition in file DECODER_main.c.

#include "../SYSTEM/sys_hardware.h"
#include "../coder/coder.h"
#include "decoder.h"

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Functions
int *	DECODER_main (void)
	Function fetches decoder output upon PCM request.

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Function Documentation

int* DECODER_main (  void   )

Function fetches decoder output upon PCM request. All decoders share this same pipe interface although they might use different sized pipes. Returns: Readable pipe frame if data is available, otherwise NULL. Definition at line 45 of file DECODER_main.c. References AI_STOP, Decoder, st_CODER::flag, st_DECODER::flag, st_DECODER::pipe, PIPE_readNext(), SAUDIOCTL, SEM_coder, and SENDOFMUSIC. Referenced by AUDIO_start(). { PIPE_Obj * pipe = &Decoder.pipe; if(Decoder.flag & DEC_PIPE_READNEXT_PENDING) { PIPE_readNext(pipe); Decoder.flag &= ~DEC_PIPE_READNEXT_PENDING; if(SEM_count(SEM_coder) == 0) SEM_post(SEM_coder); } if( PIPE_readFrameNum(pipe) ) { Decoder.flag |= DEC_PIPE_READNEXT_PENDING; return pipe->RdFrame.Frame; } else if(Coder.flag & F_CODER_DEC_EOF) { if(!(Coder.flag&F_CODER_DEC_EOF_POSTED)) { Coder.flag |= F_CODER_DEC_EOF_POSTED; mMSG_send(sysMsgQ, SYS_MSG_ID, SAUDIOCTL, AI_STOP, SYS_FOREVER); mMSG_send(uiChildMsgQ, SYS_MSG_ID, SENDOFMUSIC, DONTCARE, SYS_FOREVER); } return NULL; } if(SEM_count(SEM_coder) == 0) SEM_post(SEM_coder); return NULL; }

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