jpgdecfillbuf.c

瑞星微公司RK27XX系列芯片的SDK开发包

//
//
//

#include "JpgDecFillBuf.h"
#include "JpegBitstreamProcess.h"
#include "../../ImageWin/ImageDecodeMain.h"

// 双Buffer , 为DSP 准备码流
__align(32)    unsigned char   Jpg_gInBuf[2][JPGD_INBUFSIZE];

extern unsigned char *ImageLCDLogicBuf;

extern void DelayMs_nops(unsigned int Counter);

//
// 为DSP 准备码流数据
// 1: 成功；0:出错

long RK27_JPEGDEC_FillBuf(void)
{
    unsigned long bytes_read, NumOfMS = 0;
    volatile JPGArmZspCom *share = (JPGArmZspCom *)JPG_COM_DRAM_ADR;
    long Index;
    long c = 0;
    long r = 0;

    //initialization to share
    share->JpgInputBuf = (long) & Jpg_gInBuf[0][0];      // 码流输入Buffer
    share->JpgOutputBuf = (long)ImageBufAddr;   // RGB 输出Buffer
    share->JpgInputBufStatus[1] = share->JpgInputBufStatus[0] = JPG_DATA_EMPTY;
    share->JpgDecStatus = JPG_DEC_DECODING;
    Index = 0;

    JpgDecBitStreamInit();

    while (1)
    {
        if (share->JpgDecStatus != JPG_DEC_DECODING)
            break; // 解码结束

        //if() // 收到强制退出解码命令时
        //{
        // DelayMs_nops(200); // 在这段时间内必须保证DSP 结束操作
        // break;
        //}

        while (share->JpgInputBufStatus[Index] != JPG_DATA_EMPTY)
        {
            if (share->JpgDecStatus != JPG_DEC_DECODING)
                break;
        }

        //bytes_read = FSFileRead((void *)((unsigned long)share->JpgInputBuf+Index*JPGD_INBUFSIZE), JPGD_INBUFSIZE, pImageFile);
        bytes_read = JpgDecGetGivenBitStream((unsigned char*)((unsigned long)share->JpgInputBuf + Index * JPGD_INBUFSIZE), JPGD_INBUFSIZE);

        share->JpgInputBufStatus[Index] = JPG_DATA_FULL;

        if (bytes_read < JPGD_INBUFSIZE)
        {
            while (share->JpgDecStatus == JPG_DEC_DECODING)//若等待超过1秒，强制退出
            {
                DelayMs_nops(1);
                if (NumOfMS++ >= 1000)
                    break;
            }

            break; // 文件读完
        }
        Index = (Index + 1) % 2;
    }

    g_bufferwidth = share->JpgDecOutputWidth;
    g_bufferheight = share->JpgDecOutputHeight;

    if (share->JpgDecStatus != JPG_DEC_SUCCESS)
        return 0;
    else
        return 1;
}