Main Page | Alphabetical List | Data Structures | File List | Data Fields | Globals | Search for 
source / CODEC

CODEC_radioHdl.c File Reference

Detailed Description

This module provide Codec PCM handles for normal FM tuner mode.

REVISION

Definition in file CODEC_radioHdl.c.

#include "../SYSTEM/sys_hardware.h"
#include "codec.h"
#include "codec_assert.h"
#include "../AUDIO/audio.h"
#include "../TUNER/tuner.h"
#include "../FMXMIT/xmit_inc.h"

Include dependency graph for CODEC_radioHdl.c:

Include dependency graph

Go to the source code of this file.

Functions

void CODEC_tunerPcmPut (int *pcmBuf, int len)
 Function serves as the FM radio PCM data put handle.
void CODEC_tunerPcmGet (int *pcmBuf, int len)
 Function serves as the FM radio PCM data get handle.

Function Documentation

void CODEC_tunerPcmGet (  int *  pcmBuf,
int  len
) 
 

Function serves as the FM radio PCM data get handle.

Parameters:
pcmBuf PCM data buffer.
len Available PCM data length in words.

Definition at line 112 of file CODEC_radioHdl.c.

Referenced by AUDIO_start().

00113 {
00114     leftChannel  = pcmBuf;
00115     rightChannel = pcmBuf + len/2;
00116 }

void CODEC_tunerPcmPut (  int *  pcmBuf,
int  len
) 
 

Function serves as the FM radio PCM data put handle.

Parameters:
pcmBuf PCM data buffer.
len Pending PCM data length in words.

Definition at line 46 of file CODEC_radioHdl.c.

References st_PCM::codecMode, COP_FM_RECORD, ENCODER_getInputBuf(), ENCODER_putInputBuf(), and st_AUDIOENERGY::pFrame.

Referenced by AUDIO_start().

00047 {
00048     unsigned int i;
00049     int          dataLen = len/2;
00050     int *        pSrcLeft;
00051     int *        pSrcRight;
00052     int *        pDstLeft;
00053     int *        pDstRight;
00054     int *        pEncDstLeft;
00055     int *        pEncDstRight;
00056     
00057     pSrcLeft  = leftChannel;
00058     pSrcRight = rightChannel;
00059     pDstLeft  = pcmBuf;
00060     pDstRight = pcmBuf + dataLen;
00061     
00062     if(COP_FM_RECORD&Pcm.codecMode)
00063     {
00064         if(FALSE == ENCODER_getInputBuf(&pEncDstLeft, &pEncDstRight))
00065         {
00066             // Encoder can not catch up.
00067             asm(" nop");
00068         }
00069     }
00070     else pEncDstLeft = NULL;
00071 
00072     for (i = 0; i < dataLen; i++)
00073     {
00074         FIRDeemphasisLeftTaps[0] = *pSrcLeft++;
00075         FIRDeemphasisRightTaps[0] = *pSrcRight++;
00076         // apply demphasis filter
00077         *pDstLeft = TUNER_deemphasisFIR(&FIRDeemphasisLeft);
00078         *pDstRight = TUNER_deemphasisFIR(&FIRDeemphasisRight);
00079         
00080         if(pEncDstLeft)
00081         {
00082             *pEncDstLeft++  = *pDstLeft;
00083             *pEncDstRight++ = *pDstRight;
00084             LeftInputEnergy.pFrame  = pDstRight;
00085             RightInputEnergy.pFrame = pDstLeft;
00086             AUDIO_energy(&LeftInputEnergy);
00087             AUDIO_energy(&RightInputEnergy);
00088         }       
00089         
00090         pDstLeft++;
00091         pDstRight++;
00092     }
00093     
00094     if(pEncDstLeft) ENCODER_putInputBuf();
00095     else
00096     {                   
00097         EQ_apply(&LeftEQ,  pcmBuf,  pcmBuf);
00098         pcmBuf += dataLen;
00099         EQ_apply(&RightEQ, pcmBuf,  pcmBuf);
00100     }
00101 }

Here is the call graph for this function:

Generated on Wed Jan 19 01:12:49 2005 for neuros-firmware by  doxygen 1.3.9.1