YUV422转jpeg

#include <stdio.h> #include <jpeglib.h> #define uint8_t unsigned char int yuv422_to_jpeg(unsigned char *data, int image_width, int image_height, FILE *fp, int quality) { struct jpeg_compress_struct cinfo; struct jpeg_error_mgr jerr; JSAMPROW row_pointer[1]; /* pointer to JSAMPLE row[s] */ int row_stride; /* physical row width in image buffer */ JSAMPIMAGE buffer; int band,i,buf_width[3],buf_height[3], mem_size, max_line, counter; unsigned char *yuv[3]; uint8_t *pSrc, *pDst; yuv[0] = data; yuv[1] = yuv[0] + (image_width * image_height); yuv[2] = yuv[1] + (image_width * image_height) /2; cinfo.err = jpeg_std_error(&jerr); jpeg_create_compress(&cinfo); jpeg_stdio_dest(&cinfo, fp); cinfo.image_width = image_width; /* image width and height, in pixels */ cinfo.image_height = image_height; cinfo.input_components = 3; /* # of color components per pixel */ cinfo.in_color_space = JCS_RGB; /* colorspace of input image */ jpeg_set_defaults(&cinfo); jpeg_set_quality(&cinfo, quality, TRUE ); cinfo.raw_data_in = TRUE; cinfo.jpeg_color_space = JCS_YCbCr; cinfo.comp_info[0].h_samp_factor = 2; cinfo.comp_info[0].v_samp_factor = 1; jpeg_start_compress(&cinfo, TRUE); buffer = (JSAMPIMAGE) (*cinfo.mem->alloc_small) ((j_common_ptr) &cinfo, JPOOL_IMAGE, 3 * sizeof(JSAMPARRAY)); for(band=0; band <3; band++) { buf_width[band] = cinfo.comp_info[band].width_in_blocks * DCTSIZE; buf_height[band] = cinfo.comp_info[band].v_samp_factor * DCTSIZE; buffer[band] = (*cinfo.mem->alloc_sarray) ((j_common_ptr) &cinfo, JPOOL_IMAGE, buf_width[band], buf_height[band]); } max_line = cinfo.max_v_samp_factor*DCTSIZE; for(counter=0; cinfo.next_scanline < cinfo.image_height; counter++) { //buffer image copy. for(band=0; band <3; band++) { mem_size = buf_width[band]; pDst = (uint8_t *) buffer[band][0]; pSrc = (uint8_t *) yuv[band] + counter*buf_height[band] * buf_width[band]; for(i=0; i <buf_height[band]; i++) { memcpy(pDst, pSrc, mem_size); pSrc += buf_width[band]; pDst += buf_width[band]; } } jpeg_write_raw_data(&cinfo, buffer, max_line); } jpeg_finish_compress(&cinfo); jpeg_destroy_compress(&cinfo); return 0; }