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 show 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 - YUV - 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 }
  49
  50 int main(int argc, char *argv[])
  51 {
  52         int ret;
  53         int exit_code = EXIT_SUCCESS;
  54         int opt;
  55
  56         char filename[FILENAME_MAX] = {0};
  57         int image_fd;
  58         struct stat st;
  59         am7xxx_context *ctx;
  60         am7xxx_device *dev;
  61         int log_level = AM7XXX_LOG_INFO;
  62         int format = AM7XXX_IMAGE_FORMAT_JPEG;
  63         int width = 800;
  64         int height = 480;
  65         unsigned char *image;
  66         unsigned int size;
  67         am7xxx_device_info device_info;
  68
  69         while ((opt = getopt(argc, argv, "f:F:l:W:H:h")) != -1) {
  70                 switch (opt) {
  71                 case 'f':
  72                         strncpy(filename, optarg, FILENAME_MAX);
  73                         break;
  74                 case 'F':
  75                         format = atoi(optarg);
  76                         switch(format) {
  77                         case AM7XXX_IMAGE_FORMAT_JPEG:
  78                                 fprintf(stdout, "JPEG format\n");
  79                                 break;
  80                         case AM7XXX_IMAGE_FORMAT_NV12:
  81                                 fprintf(stdout, "NV12 format\n");
  82                                 break;
  83                         default:
  84                                 fprintf(stderr, "Unsupported format\n");
  85                                 exit(EXIT_FAILURE);
  86                         }
  87                         break;
  88                 case 'l':
  89                         log_level = atoi(optarg);
  90                         if (log_level < AM7XXX_LOG_FATAL || log_level > AM7XXX_LOG_TRACE) {
  91                                 fprintf(stderr, "Unsupported log level, falling back to AM7XXX_LOG_ERROR\n");
  92                                 log_level = AM7XXX_LOG_ERROR;
  93                         }
  94                         break;
  95                 case 'W':
  96                         width = atoi(optarg);
  97                         if (width < 0) {
  98                                 fprintf(stderr, "Unsupported width\n");
  99                                 exit(EXIT_FAILURE);
 100                         }
 101                         break;
 102                 case 'H':
 103                         height = atoi(optarg);
 104                         if (height < 0) {
 105                                 fprintf(stderr, "Unsupported height\n");
 106                                 exit(EXIT_FAILURE);
 107                         }
 108                         break;
 109                 case 'h':
 110                         usage(argv[0]);
 111                         exit(EXIT_SUCCESS);
 112                         break;
 113                 default: /* '?' */
 114                         usage(argv[0]);
 115                         exit(EXIT_FAILURE);
 116                 }
 117         }
 118
 119         if (filename[0] == '\0') {
 120                 fprintf(stderr, "An image file MUST be specified.\n");
 121                 exit_code = EXIT_FAILURE;
 122                 goto out;
 123         }
 124
 125         image_fd = open(filename, O_RDONLY);
 126         if (image_fd < 0) {
 127                 perror("open");
 128                 exit_code = EXIT_FAILURE;
 129                 goto out;
 130         }
 131         if (fstat(image_fd, &st) < 0) {
 132                 perror("fstat");
 133                 exit_code = EXIT_FAILURE;
 134                 goto out_close_image_fd;
 135         }
 136         size = st.st_size;
 137
 138         image = mmap(NULL, st.st_size, PROT_READ, MAP_SHARED, image_fd, 0);
 139         if (image == NULL) {
 140                 perror("mmap");
 141                 exit_code = EXIT_FAILURE;
 142                 goto out_close_image_fd;
 143         }
 144
 145         ret = am7xxx_init(&ctx);
 146         if (ret < 0) {
 147                 perror("am7xxx_init");
 148                 exit_code = EXIT_FAILURE;
 149                 goto out_munmap;
 150         }
 151
 152         am7xxx_set_log_level(ctx, log_level);
 153
 154         ret = am7xxx_open_device(ctx, &dev, 0);
 155         if (ret < 0) {
 156                 perror("am7xxx_open_device");
 157                 exit_code = EXIT_FAILURE;
 158                 goto cleanup;
 159         }
 160
 161
 162         ret = am7xxx_close_device(dev);
 163         if (ret < 0) {
 164                 perror("am7xxx_close_device");
 165                 exit_code = EXIT_FAILURE;
 166                 goto cleanup;
 167         }
 168
 169         ret = am7xxx_open_device(ctx, &dev, 0);
 170         if (ret < 0) {
 171                 perror("am7xxx_open_device");
 172                 exit_code = EXIT_FAILURE;
 173                 goto cleanup;
 174         }
 175
 176         ret = am7xxx_get_device_info(dev, &device_info);
 177         if (ret < 0) {
 178                 perror("am7xxx_get_info");
 179                 exit_code = EXIT_FAILURE;
 180                 goto cleanup;
 181         }
 182         printf("Native resolution: %dx%d\n",
 183                device_info.native_width, device_info.native_height);
 184
 185         ret = am7xxx_set_power_mode(dev, AM7XXX_POWER_LOW);
 186         if (ret < 0) {
 187                 perror("am7xxx_set_power_mode");
 188                 exit_code = EXIT_FAILURE;
 189                 goto cleanup;
 190         }
 191
 192         ret = am7xxx_send_image(dev, format, width, height, image, size);
 193         if (ret < 0) {
 194                 perror("am7xxx_send_image");
 195                 exit_code = EXIT_FAILURE;
 196                 goto cleanup;
 197         }
 198
 199         exit_code = EXIT_SUCCESS;
 200
 201 cleanup:
 202         am7xxx_shutdown(ctx);
 203
 204 out_munmap:
 205         ret = munmap(image, size);
 206         if (ret < 0)
 207                 perror("munmap");
 208
 209 out_close_image_fd:
 210         ret = close(image_fd);
 211         if (ret < 0)
 212                 perror("close");
 213
 214 out:
 215         exit(exit_code);
 216 }