C++通过jpeglib进行jpeg编码,输入格式为rgb、yuv422、yuv444
- #include <stdio.h>
- extern "C"{
- #include "../../src/jpeg_8c/jpeglib.h"
- }
- /**
- brief jpeg编码,输入格式为uyvy
- */
- void write_YUV_JPEG_file (char * filename, unsigned char* yuvData, int quality,
- int image_width,int image_height)
- {
- struct jpeg_compress_struct cinfo;
- struct jpeg_error_mgr jerr;
- FILE * outfile; /* target file */
- //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];
- cinfo.err = jpeg_std_error(&jerr);
- jpeg_create_compress(&cinfo);
- if ((outfile = fopen(filename, "wb")) == NULL) {
- fprintf(stderr, "can't open %sn", filename);
- exit(1);
- }
- jpeg_stdio_dest(&cinfo, outfile);
- 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_YCbCr; /* 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]);
- }
- unsigned char *rawData[3];
- rawData[0]=yuvData;
- rawData[1]=yuvData+image_width*image_height;
- rawData[2]=yuvData+image_width*image_height*3/2;
- int max_line = cinfo.max_v_samp_factor*DCTSIZE;
- for(int counter=0; cinfo.next_scanline < cinfo.image_height; counter++)
- {
- //buffer image copy.
- for(band=0; band<3; band++)
- {
- int mem_size = buf_width[band];
- unsigned char *pDst = (unsigned char *) buffer[band][0];
- unsigned char *pSrc = (unsigned char *) (rawData[band] + //yuv.data[band]分别表示YUV起始地址
- 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);
- fclose(outfile);
- jpeg_destroy_compress(&cinfo);
- }
- /**
- brief jpeg编码,输入格式为rgb
- */
- void write_RGB_JPEG_file(char * filename, unsigned char *rgb,int image_width,
- int image_height, int quality /*= 90*/)
- {
- JSAMPLE * image_buffer = (JSAMPLE*)rgb;
- /* This struct contains the JPEG compression parameters and pointers to
- * working space (which is allocated as needed by the JPEG library).
- * It is possible to have several such structures, representing multiple
- * compression/decompression processes, in existence at once. We refer
- * to any one struct (and its associated working data) as a "JPEG object".
- */
- struct jpeg_compress_struct cinfo;
- /* This struct represents a JPEG error handler. It is declared separately
- * because applications often want to supply a specialized error handler
- * (see the second half of this file for an example). But here we just
- * take the easy way out and use the standard error handler, which will
- * print a message on stderr and call exit() if compression fails.
- * Note that this struct must live as long as the main JPEG parameter
- * struct, to avoid dangling-pointer problems.
- */
- struct jpeg_error_mgr jerr;
- /* More stuff */
- FILE * outfile; /* target file */
- JSAMPROW row_pointer[1]; /* pointer to JSAMPLE row[s] */
- int row_stride; /* physical row width in image buffer */
- /* Step 1: allocate and initialize JPEG compression object */
- /* We have to set up the error handler first, in case the initialization
- * step fails. (Unlikely, but it could happen if you are out of memory.)
- * This routine fills in the contents of struct jerr, and returns jerr's
- * address which we place into the link field in cinfo.
- */
- cinfo.err = jpeg_std_error(&jerr);
- /* Now we can initialize the JPEG compression object. */
- jpeg_create_compress(&cinfo);
- /* Step 2: specify data destination (eg, a file) */
- /* Note: steps 2 and 3 can be done in either order. */
- /* Here we use the library-supplied code to send compressed data to a
- * stdio stream. You can also write your own code to do something else.
- * VERY IMPORTANT: use "b" option to fopen() if you are on a machine that
- * requires it in order to write binary files.
- */
- if ((outfile = fopen(filename, "wb")) == NULL) {
- fprintf(stderr, "can't open %sn", filename);
- exit(1);
- }
- jpeg_stdio_dest(&cinfo, outfile);
- /* Step 3: set parameters for compression */
- /* First we supply a description of the input image.
- * Four fields of the cinfo struct must be filled in:
- */
- 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 */
- /* Now use the library's routine to set default compression parameters.
- * (You must set at least cinfo.in_color_space before calling this,
- * since the defaults depend on the source color space.)
- */
- jpeg_set_defaults(&cinfo);
- /* Now you can set any non-default parameters you wish to.
- * Here we just illustrate the use of quality (quantization table) scaling:
- */
- jpeg_set_quality(&cinfo, quality, TRUE /* limit to baseline-JPEG values */);
- /* Step 4: Start compressor */
- /* TRUE ensures that we will write a complete interchange-JPEG file.
- * Pass TRUE unless you are very sure of what you're doing.
- */
- jpeg_start_compress(&cinfo, TRUE);
- /* Step 5: while (scan lines remain to be written) */
- /* jpeg_write_scanlines(...); */
- /* Here we use the library's state variable cinfo.next_scanline as the
- * loop counter, so that we don't have to keep track ourselves.
- * To keep things simple, we pass one scanline per call; you can pass
- * more if you wish, though.
- */
- row_stride = image_width * 3; /* JSAMPLEs per row in image_buffer */
- while (cinfo.next_scanline < cinfo.image_height) {
- /* jpeg_write_scanlines expects an array of pointers to scanlines.
- * Here the array is only one element long, but you could pass
- * more than one scanline at a time if that's more convenient.
- */
- row_pointer[0] = & image_buffer[cinfo.next_scanline * row_stride];
- (void) jpeg_write_scanlines(&cinfo, row_pointer, 1);
- }
- /* Step 6: Finish compression */
- jpeg_finish_compress(&cinfo);
- /* After finish_compress, we can close the output file. */
- fclose(outfile);
- /* Step 7: release JPEG compression object */
- /* This is an important step since it will release a good deal of memory. */
- jpeg_destroy_compress(&cinfo);
- /* And we're done! */
- }
- /**
- brief jpeg编码,输入格式为yuv444
- */
- void write_YUV444_JPEG_file(char * filename, unsigned char *yuv444,int image_width,
- int image_height, int quality /*= 90*/)
- {
- JSAMPLE * image_buffer = (JSAMPLE*)yuv444;
- /* This struct contains the JPEG compression parameters and pointers to
- * working space (which is allocated as needed by the JPEG library).
- * It is possible to have several such structures, representing multiple
- * compression/decompression processes, in existence at once. We refer
- * to any one struct (and its associated working data) as a "JPEG object".
- */
- struct jpeg_compress_struct cinfo;
- /* This struct represents a JPEG error handler. It is declared separately
- * because applications often want to supply a specialized error handler
- * (see the second half of this file for an example). But here we just
- * take the easy way out and use the standard error handler, which will
- * print a message on stderr and call exit() if compression fails.
- * Note that this struct must live as long as the main JPEG parameter
- * struct, to avoid dangling-pointer problems.
- */
- struct jpeg_error_mgr jerr;
- /* More stuff */
- FILE * outfile; /* target file */
- JSAMPROW row_pointer[1]; /* pointer to JSAMPLE row[s] */
- int row_stride; /* physical row width in image buffer */
- /* Step 1: allocate and initialize JPEG compression object */
- /* We have to set up the error handler first, in case the initialization
- * step fails. (Unlikely, but it could happen if you are out of memory.)
- * This routine fills in the contents of struct jerr, and returns jerr's
- * address which we place into the link field in cinfo.
- */
- cinfo.err = jpeg_std_error(&jerr);
- /* Now we can initialize the JPEG compression object. */
- jpeg_create_compress(&cinfo);
- /* Step 2: specify data destination (eg, a file) */
- /* Note: steps 2 and 3 can be done in either order. */
- /* Here we use the library-supplied code to send compressed data to a
- * stdio stream. You can also write your own code to do something else.
- * VERY IMPORTANT: use "b" option to fopen() if you are on a machine that
- * requires it in order to write binary files.
- */
- if ((outfile = fopen(filename, "wb")) == NULL) {
- fprintf(stderr, "can't open %sn", filename);
- exit(1);
- }
- jpeg_stdio_dest(&cinfo, outfile);
- /* Step 3: set parameters for compression */
- /* First we supply a description of the input image.
- * Four fields of the cinfo struct must be filled in:
- */
- 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_YCbCr; /* colorspace of input image */
- /* Now use the library's routine to set default compression parameters.
- * (You must set at least cinfo.in_color_space before calling this,
- * since the defaults depend on the source color space.)
- */
- jpeg_set_defaults(&cinfo);
- /* Now you can set any non-default parameters you wish to.
- * Here we just illustrate the use of quality (quantization table) scaling:
- */
- jpeg_set_quality(&cinfo, quality, TRUE /* limit to baseline-JPEG values */);
- /* Step 4: Start compressor */
- /* TRUE ensures that we will write a complete interchange-JPEG file.
- * Pass TRUE unless you are very sure of what you're doing.
- */
- jpeg_start_compress(&cinfo, TRUE);
- /* Step 5: while (scan lines remain to be written) */
- /* jpeg_write_scanlines(...); */
- /* Here we use the library's state variable cinfo.next_scanline as the
- * loop counter, so that we don't have to keep track ourselves.
- * To keep things simple, we pass one scanline per call; you can pass
- * more if you wish, though.
- */
- row_stride = image_width * 3; /* JSAMPLEs per row in image_buffer */
- while (cinfo.next_scanline < cinfo.image_height) {
- /* jpeg_write_scanlines expects an array of pointers to scanlines.
- * Here the array is only one element long, but you could pass
- * more than one scanline at a time if that's more convenient.
- */
- row_pointer[0] = & image_buffer[cinfo.next_scanline * row_stride];
- (void) jpeg_write_scanlines(&cinfo, row_pointer, 1);
- }
- /* Step 6: Finish compression */
- jpeg_finish_compress(&cinfo);
- /* After finish_compress, we can close the output file. */
- fclose(outfile);
- /* Step 7: release JPEG compression object */
- /* This is an important step since it will release a good deal of memory. */
- jpeg_destroy_compress(&cinfo);
- /* And we're done! */
- }
来源: http://www.phpxs.com/code/1004229/