quicktime/dechunk.c

   1 #include "funcprotos.h"
   2 #include "quicktime.h"
   3
   4 int usage(void)
   5 {
   6         printf("usage: dechunk [-f framerate] <input movie> <output prefix>\n");
   7         printf("        Movies containing rgb frames are written as ppm images.\n");
   8         exit(1);
   9         return 0;
  10 }
  11
  12 int main(int argc, char *argv[])
  13 {
  14         quicktime_t *file;
  15         FILE *output;
  16         int result = 0;
  17         int i, j;
  18         int64_t length;
  19         char string[1024], *prefix = 0, *input = 0;
  20         char *data = 0;
  21         int bytes = 0, old_bytes = 0;
  22         float output_rate = 0;
  23         float input_rate;
  24         int64_t input_frame;
  25         int64_t new_length;
  26         int width, height;
  27         int rgb_to_ppm = 0;
  28
  29         if(argc < 3)
  30         {
  31                 usage();
  32         }
  33
  34         for(i = 1, j = 0; i < argc; i++)
  35         {
  36                 if(!strcmp(argv[i], "-f"))
  37                 {
  38                         if(i + 1 < argc)
  39                         {
  40                                 output_rate = atof(argv[++i]);
  41                         }
  42                         else
  43                                 usage();
  44                 }
  45                 else
  46                 if(j == 0)
  47                 {
  48                         input = argv[i];
  49                         j++;
  50                 }
  51                 else
  52                 if(j == 1)
  53                 {
  54                         prefix = argv[i];
  55                         j++;
  56                 }
  57         }
  58
  59         if(!prefix || !input) usage();
  60
  61         if(!(file = quicktime_open(input, 1, 0)))
  62         {
  63                 printf("Open failed\n");
  64                 exit(1);
  65         }
  66
  67         if(!quicktime_video_tracks(file))
  68         {
  69                 printf("No video tracks.\n");
  70                 exit(1);
  71         }
  72
  73         if(quicktime_match_32(quicktime_video_compressor(file, 0), QUICKTIME_RAW))
  74         {
  75                 printf("Converting to ppm.\n");
  76                 rgb_to_ppm = 1;
  77         }
  78
  79         length = quicktime_video_length(file, 0);
  80         input_rate = quicktime_frame_rate(file, 0);
  81         if(!output_rate) output_rate = input_rate;
  82         new_length = output_rate / input_rate * length;
  83         width = quicktime_video_width(file, 0);
  84         height = quicktime_video_height(file, 0);
  85
  86         for(i = 0; i < new_length; i++)
  87         {
  88 /* Get output file */
  89                 sprintf(string, "%s%06d", prefix, i);
  90                 if(!(output = fopen(string, "wb")))
  91                 {
  92                         perror("Open failed");
  93                         exit(1);
  94                 }
  95
  96 /* Get input frame */
  97                 input_frame = (int64_t)(input_rate / output_rate * i);
  98                 bytes = quicktime_frame_size(file, input_frame, 0);
  99
 100                 if(data)
 101                 {
 102                         if(bytes > old_bytes) { free(data); data = 0; }
 103                 }
 104
 105                 if(!data)
 106                 {
 107                         old_bytes = bytes;
 108                         data = malloc(bytes);
 109                 }
 110
 111                 quicktime_set_video_position(file, input_frame, 0);
 112                 quicktime_read_data(file, data, bytes);
 113                 if(rgb_to_ppm)
 114                 {
 115                         fprintf(output, "P6\n%d %d\n%d\n", width, height, 0xff);
 116                 }
 117
 118                 if(!fwrite(data, bytes, 1, output))
 119                 {
 120                         perror("write failed");
 121                 }
 122                 fclose(output);
 123         }
 124
 125         quicktime_close(file);
 126 }