利用三星S3C6410源码实现同时压缩视频和图片

来源：互联网发布：java写一个猜数字游戏编辑：程序博客网时间：2024/04/30 12:23

前段时间实现了利用三星S3C6410一边压缩视频生成H264文件一边抓取并压缩生成jpg图片。核心步骤如下：

视频压缩和图片压缩利用同一个handle。

    /* Codec set */    /* Get capability */    ret = ioctl(cam_c_fp , VIDIOC_QUERYCAP, &cap);

一边压缩视频：

if(frame_count == 1)                    encoded_buf = mfc_encoder_exe(handle, g_yuv, YUV_FRAME_BUFFER_SIZE, 1, &encoded_size);                else                    encoded_buf = mfc_encoder_exe(handle, g_yuv, YUV_FRAME_BUFFER_SIZE, 0, &encoded_size);

2.一边获取视频中的某一帧的数据：

 if (read(cam_c_fp, g_yuv_cc, g_YUV420_Frame_Buffer_Size) < 0) {        perror("read()");}

3.读取完数据之后，因为图片压缩前的格式必须是yuv422的，而摄像头的数据格式为yuv420所以需要转化：

convert_yuv420p_to_yuv422_my( g_yuv_cc,g_yuv_c,g_codec_Width,g_codec_Height);

转化的具体实现为：

//平面YUV420转平面YUV422static void convert_yuv420p_to_yuv422_my(unsigned char *src,unsigned char *dst,int width,int height){int i,j;unsigned char *pY420_0=src;unsigned char *pY420_1=src+width;unsigned char *pU420=src+width*height;unsigned char *pV420=src+width*height*5/4;unsigned char *pY422_0=dst;unsigned char *pY422_1=dst+width*2;for(i=0;i<height/2;i++){for(j=0;j<width*2;j+=4){*pY422_0++=*pY420_0++;*pY422_1++=*pY420_1++;*pY422_0++=*pU420;*pY422_1++=*pU420++;*pY422_0++=*pY420_0++;*pY422_1++=*pY420_1++;*pY422_0++=*pV420;*pY422_1++=*pV420++;}pY420_0+=width;pY420_1+=width;pY422_0+=width*2;pY422_1+=width*2;}}

4.转换完成之后就是简单的压缩过程了：

/* JPEG encoding */    /* JPEG Handle initialization */    jpg_handle = SsbSipJPEGEncodeInit();    if (jpg_handle < 0)        return;    /* Set encoding configs */    if((ret = SsbSipJPEGSetConfig(JPEG_SET_SAMPING_MODE, JPG_422)) != JPEG_OK)        return;        if((ret = SsbSipJPEGSetConfig(JPEG_SET_ENCODE_WIDTH, g_codec_Width)) != JPEG_OK)        return;        if((ret = SsbSipJPEGSetConfig(JPEG_SET_ENCODE_HEIGHT, g_codec_Height)) != JPEG_OK)        return;    if((ret = SsbSipJPEGSetConfig(JPEG_SET_ENCODE_QUALITY, JPG_QUALITY_LEVEL_2)) != JPEG_OK)        return;    if((ret = SsbSipJPEGSetConfig(JPEG_SET_ENCODE_THUMBNAIL, TRUE)) != JPEG_OK)        return;        //if((ret = SsbSipJPEGSetConfig(JPEG_SET_THUMBNAIL_WIDTH, 160)) != JPEG_OK)        //  return;        //   Main JPEG have to be multiple of Thumbnail resolution        if((ret = SsbSipJPEGSetConfig(JPEG_SET_THUMBNAIL_WIDTH, g_Thumbnail_Width)) != JPEG_OK)                return;        //if((ret = SsbSipJPEGSetConfig(JPEG_SET_THUMBNAIL_HEIGHT, 120)) != JPEG_OK)                //return;       //   Main JPEG have to be multiple of Thumbnail resolution        if((ret = SsbSipJPEGSetConfig(JPEG_SET_THUMBNAIL_HEIGHT, g_Thumbnail_Height)) != JPEG_OK)                return;    /* Get input buffer address */        in_buf = SsbSipJPEGGetEncodeInBuf(jpg_handle, g_YUV422_Frame_Buffer_Size);    if(in_buf == NULL)        return;    /* Copy YUV data from camera to JPEG driver */        memcpy(in_buf, g_yuv_c, g_YUV422_Frame_Buffer_Size);    /* Make Exif info parameters */    memset(&ExifInfo, 0x00, sizeof(ExifFileInfo));    makeExifParam(&ExifInfo);    /* Encode YUV stream */    ret = SsbSipJPEGEncodeExe(jpg_handle, &ExifInfo, JPEG_USE_HW_SCALER);    //with Exif    /* Get output buffer address */    out_buf = SsbSipJPEGGetEncodeOutBuf(jpg_handle, &jpg_size);    if(out_buf == NULL)        return;    fwrite(out_buf, 1, jpg_size, jpg_fp);    fclose(jpg_fp);    SsbSipJPEGEncodeDeInit(jpg_handle);    printf("CAPTURE SUCCESS\n");

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