examples/picoproj.c

   1 /* picoproj - test program for libam7xxx
   2  *
   3  * Copyright (C) 2012  Antonio Ospite <ospite@studenti.unina.it>
   4  *
   5  * This program is free software: you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation, either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 /**
  20  * @example examples/picoproj.c
  21  * A minimal example to show how to use libam7xxx to display a static image.
  22  */
  23
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27 #include <sys/mman.h>
  28 #include <sys/types.h>
  29 #include <sys/stat.h>
  30 #include <fcntl.h>
  31 #include <unistd.h>
  32
  33 #include "am7xxx.h"
  34
  35 static void usage(char *name)
  36 {
  37         printf("usage: %s [OPTIONS]\n\n", name);
  38         printf("OPTIONS:\n");
  39         printf("\t-f <filename>\t\tthe image file to upload\n");
  40         printf("\t-F <format>\t\tthe image format to use (default is JPEG)\n");
  41         printf("\t\t\t\tSUPPORTED FORMATS:\n");
  42         printf("\t\t\t\t\t1 - JPEG\n");
  43         printf("\t\t\t\t\t2 - NV12\n");
  44         printf("\t-l <log level>\t\tthe verbosity level of libam7xxx output (0-5)\n");
  45         printf("\t-W <image width>\tthe width of the image to upload\n");
  46         printf("\t-H <image height>\tthe height of the image to upload\n");
  47         printf("\t-h \t\t\tthis help message\n");
  48         printf("\n\nEXAMPLE OF USE:\n");
  49         printf("\t%s -f file.jpg -F 1 -l 5 -W 800 -H 480\n", name);
  50 }
  51
  52 int main(int argc, char *argv[])
  53 {
  54         int ret;
  55         int exit_code = EXIT_SUCCESS;
  56         int opt;
  57
  58         char filename[FILENAME_MAX] = {0};
  59         int image_fd;
  60         struct stat st;
  61         am7xxx_context *ctx;
  62         am7xxx_device *dev;
  63         int log_level = AM7XXX_LOG_INFO;
  64         int format = AM7XXX_IMAGE_FORMAT_JPEG;
  65         int width = 800;
  66         int height = 480;
  67         unsigned char *image;
  68         unsigned int size;
  69         am7xxx_device_info device_info;
  70
  71         while ((opt = getopt(argc, argv, "f:F:l:W:H:h")) != -1) {
  72                 switch (opt) {
  73                 case 'f':
  74                         strncpy(filename, optarg, FILENAME_MAX);
  75                         break;
  76                 case 'F':
  77                         format = atoi(optarg);
  78                         switch(format) {
  79                         case AM7XXX_IMAGE_FORMAT_JPEG:
  80                                 fprintf(stdout, "JPEG format\n");
  81                                 break;
  82                         case AM7XXX_IMAGE_FORMAT_NV12:
  83                                 fprintf(stdout, "NV12 format\n");
  84                                 break;
  85                         default:
  86                                 fprintf(stderr, "Unsupported format\n");
  87                                 exit(EXIT_FAILURE);
  88                         }
  89                         break;
  90                 case 'l':
  91                         log_level = atoi(optarg);
  92                         if (log_level < AM7XXX_LOG_FATAL || log_level > AM7XXX_LOG_TRACE) {
  93                                 fprintf(stderr, "Unsupported log level, falling back to AM7XXX_LOG_ERROR\n");
  94                                 log_level = AM7XXX_LOG_ERROR;
  95                         }
  96                         break;
  97                 case 'W':
  98                         width = atoi(optarg);
  99                         if (width < 0) {
 100                                 fprintf(stderr, "Unsupported width\n");
 101                                 exit(EXIT_FAILURE);
 102                         }
 103                         break;
 104                 case 'H':
 105                         height = atoi(optarg);
 106                         if (height < 0) {
 107                                 fprintf(stderr, "Unsupported height\n");
 108                                 exit(EXIT_FAILURE);
 109                         }
 110                         break;
 111                 case 'h':
 112                         usage(argv[0]);
 113                         exit(EXIT_SUCCESS);
 114                         break;
 115                 default: /* '?' */
 116                         usage(argv[0]);
 117                         exit(EXIT_FAILURE);
 118                 }
 119         }
 120
 121         if (filename[0] == '\0') {
 122                 fprintf(stderr, "An image file MUST be specified.\n");
 123                 exit_code = EXIT_FAILURE;
 124                 goto out;
 125         }
 126
 127         image_fd = open(filename, O_RDONLY);
 128         if (image_fd < 0) {
 129                 perror("open");
 130                 exit_code = EXIT_FAILURE;
 131                 goto out;
 132         }
 133         if (fstat(image_fd, &st) < 0) {
 134                 perror("fstat");
 135                 exit_code = EXIT_FAILURE;
 136                 goto out_close_image_fd;
 137         }
 138         size = st.st_size;
 139
 140         image = mmap(NULL, st.st_size, PROT_READ, MAP_SHARED, image_fd, 0);
 141         if (image == NULL) {
 142                 perror("mmap");
 143                 exit_code = EXIT_FAILURE;
 144                 goto out_close_image_fd;
 145         }
 146
 147         ret = am7xxx_init(&ctx);
 148         if (ret < 0) {
 149                 perror("am7xxx_init");
 150                 exit_code = EXIT_FAILURE;
 151                 goto out_munmap;
 152         }
 153
 154         am7xxx_set_log_level(ctx, log_level);
 155
 156         ret = am7xxx_open_device(ctx, &dev, 0);
 157         if (ret < 0) {
 158                 perror("am7xxx_open_device");
 159                 exit_code = EXIT_FAILURE;
 160                 goto cleanup;
 161         }
 162
 163
 164         ret = am7xxx_close_device(dev);
 165         if (ret < 0) {
 166                 perror("am7xxx_close_device");
 167                 exit_code = EXIT_FAILURE;
 168                 goto cleanup;
 169         }
 170
 171         ret = am7xxx_open_device(ctx, &dev, 0);
 172         if (ret < 0) {
 173                 perror("am7xxx_open_device");
 174                 exit_code = EXIT_FAILURE;
 175                 goto cleanup;
 176         }
 177
 178         ret = am7xxx_get_device_info(dev, &device_info);
 179         if (ret < 0) {
 180                 perror("am7xxx_get_info");
 181                 exit_code = EXIT_FAILURE;
 182                 goto cleanup;
 183         }
 184         printf("Native resolution: %dx%d\n",
 185                device_info.native_width, device_info.native_height);
 186
 187         ret = am7xxx_set_power_mode(dev, AM7XXX_POWER_LOW);
 188         if (ret < 0) {
 189                 perror("am7xxx_set_power_mode");
 190                 exit_code = EXIT_FAILURE;
 191                 goto cleanup;
 192         }
 193
 194         ret = am7xxx_send_image(dev, format, width, height, image, size);
 195         if (ret < 0) {
 196                 perror("am7xxx_send_image");
 197                 exit_code = EXIT_FAILURE;
 198                 goto cleanup;
 199         }
 200
 201         exit_code = EXIT_SUCCESS;
 202
 203 cleanup:
 204         am7xxx_shutdown(ctx);
 205
 206 out_munmap:
 207         ret = munmap(image, size);
 208         if (ret < 0)
 209                 perror("munmap");
 210
 211 out_close_image_fd:
 212         ret = close(image_fd);
 213         if (ret < 0)
 214                 perror("close");
 215
 216 out:
 217         exit(exit_code);
 218 }