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文件大小: 5mb
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上传时间: 2015-01-17
详细说明： 利用jpeglib库转JPEG static void put_jpeg_yuv420p_file(FILE *fp, unsigned char *image, int width, int height, int quality) { int i, j; JSAMPROW y[16],cb[16],cr[16]; // y[2][5] = color sample of row 2 and pixel column 5; (one plane) JSAMPARRAY data[3]; // t[0][2][5] = color sample 0 of row 2 and column 5 struct jpeg_compress_struct cinfo; struct jpeg_error_mgr jerr; data[0] = y; data[1] = cb; data[2] = cr; cinfo.err = jpeg_std_error(&jerr); // Errors get written to stderr jpeg_create_compres s(&cinfo); cinfo.image_width = width; cinfo.image_height = height; cinfo.input_components = 3; jpeg_set_defaults(&cinfo); jpeg_set_colorspace(&cinfo, JCS_YCbCr); cinfo.raw_data_in = TRUE; // Supply downsampled data #if JPEG_LIB_VERSION >= 70 //#warning using JPEG_LIB_VERSION >= 70 cinfo.do_fancy_downsampling = FALSE; // Fix segfault with v7 #endif cinfo.comp_info[0].h_samp_factor = 2; cinfo.comp_info[0].v_samp_factor = 2; cinfo.comp_info[1].h_samp_factor = 1; cinfo.comp_info[1].v_samp_factor = 1; cinfo.comp_info[2].h_samp_factor = 1; cinfo.comp_info[2].v_samp_factor = 1; jpeg_set_quality(&cinfo, quality, TRUE); cinfo.dct_method = JDCT_FASTEST; jpeg_stdio_dest(&cinfo, fp); // Data written to file jpeg_start_compress(&cinfo, TRUE); for (j = 0; j < height; j += 16) { for (i = 0; i < 16; i++) { y[i] = image + width * (i + j); if (i % 2 == 0) { cb[i / 2] = image + width * height + width / 2 * ((i + j) / 2); cr[i / 2] = image + width * height + width * height / 4 + width / 2 * ((i + j) / 2); } } jpeg_write_raw_data(&cinfo, data, 16); } jpeg_finish_compress(&cinfo); jpeg_destroy_compress(&cinfo); } ...展开收缩
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