在网上找了好几套，结果都不对。后来终于找到一套，还缺了一点。于是连蒙带猜，终于保存成功了。
int clipNv12ToJpgFile(const char *pFileName, const char* pYUVBuffer, const int nWidth, const int nHeight) { struct jpeg_compress_struct cinfo; struct jpeg_error_mgr jerr; JSAMPROW row_pointer[1]; FILE * pJpegFile = NULL; unsigned char *yuvbuf = NULL; unsigned char *ybase = NULL, *ubase = NULL; int i=0, j=0; int idx=0; cinfo.err = jpeg_std_error(&jerr); jpeg_create_compress(&cinfo); if ((pJpegFile = fopen(pFileName, "wb")) == NULL) { return -1; } jpeg_stdio_dest(&cinfo, pJpegFile); // image width and height, in pixels cinfo.image_width = nWidth; cinfo.image_height = nHeight; cinfo.input_components = 3; // # of color components per pixel cinfo.in_color_space = JCS_YCbCr; //colorspace of input image jpeg_set_defaults(&cinfo); jpeg_set_quality(&cinfo, JPEG_QUALITY, TRUE ); cinfo.jpeg_color_space = JCS_YCbCr; cinfo.comp_info[0].h_samp_factor = 2; cinfo.comp_info[0].v_samp_factor = 2; jpeg_start_compress(&cinfo, TRUE); if(!(yuvbuf=(unsigned char *)malloc(nWidth*3))!=NULL) { return -1; } memset(yuvbuf, 0, nWidth*3); ybase=pYUVBuffer; ubase=pYUVBuffer+nWidth*nHeight; while (cinfo.next_scanline < cinfo.image_height) { idx=0; for(i=0;i<nWidth;i++) { yuvbuf[idx++]=ybase[i + j * nWidth]; yuvbuf[idx++]=ubase[j/2 * nWidth+(i/2)*2]; yuvbuf[idx++]=ubase[j/2 * nWidth+(i/2)*2+1]; } row_pointer[0] = yuvbuf; jpeg_write_scanlines(&cinfo, row_pointer, 1); j++; } jpeg_finish_compress( &cinfo); jpeg_destroy_compress(&cinfo); fclose(pJpegFile); return 0; }
