quicktime/mdhd.c

   1 #include "funcprotos.h"
   2 #include "quicktime.h"
   3
   4 void quicktime_mdhd_init(quicktime_mdhd_t *mdhd)
   5 {
   6         mdhd->version = 0;
   7         mdhd->flags = 0;
   8         mdhd->creation_time = quicktime_current_time();
   9         mdhd->modification_time = quicktime_current_time();
  10         mdhd->time_scale = 0;
  11         mdhd->duration = 0;
  12         mdhd->language = 0;
  13         mdhd->quality = 100;
  14 }
  15
  16 void quicktime_mdhd_init_video(quicktime_t *file,
  17                                                                 quicktime_mdhd_t *mdhd,
  18                                                                 int frame_w,
  19                                                                 int frame_h,
  20                                                                 float frame_rate)
  21 {
  22         mdhd->time_scale = quicktime_get_timescale(frame_rate);
  23 //printf("quicktime_mdhd_init_video %d %f\n", mdhd->time_scale, frame_rate);
  24         mdhd->duration = 0;      /* set this when closing */
  25 }
  26
  27 void quicktime_mdhd_init_audio(quicktime_mdhd_t *mdhd,
  28                                                         int sample_rate)
  29 {
  30         mdhd->time_scale = sample_rate;
  31         mdhd->duration = 0;      /* set this when closing */
  32 }
  33
  34 void quicktime_mdhd_delete(quicktime_mdhd_t *mdhd)
  35 {
  36 }
  37
  38 void quicktime_read_mdhd(quicktime_t *file, quicktime_mdhd_t *mdhd)
  39 {
  40         mdhd->version = quicktime_read_char(file);
  41         mdhd->flags = quicktime_read_int24(file);
  42         mdhd->creation_time = quicktime_read_int32(file);
  43         mdhd->modification_time = quicktime_read_int32(file);
  44         mdhd->time_scale = quicktime_read_int32(file);
  45         mdhd->duration = quicktime_read_int32(file);
  46         mdhd->language = quicktime_read_int16(file);
  47         mdhd->quality = quicktime_read_int16(file);
  48 }
  49
  50 void quicktime_mdhd_dump(quicktime_mdhd_t *mdhd)
  51 {
  52         printf("   media header\n");
  53         printf("    version %d\n", mdhd->version);
  54         printf("    flags %d\n", mdhd->flags);
  55         printf("    creation_time %u\n", mdhd->creation_time);
  56         printf("    modification_time %u\n", mdhd->modification_time);
  57         printf("    time_scale %d\n", mdhd->time_scale);
  58         printf("    duration %d\n", mdhd->duration);
  59         printf("    language %d\n", mdhd->language);
  60         printf("    quality %d\n", mdhd->quality);
  61 }
  62
  63 void quicktime_write_mdhd(quicktime_t *file, quicktime_mdhd_t *mdhd)
  64 {
  65         quicktime_atom_t atom;
  66         quicktime_atom_write_header(file, &atom, "mdhd");
  67
  68         quicktime_write_char(file, mdhd->version);
  69         quicktime_write_int24(file, mdhd->flags);
  70         quicktime_write_int32(file, mdhd->creation_time);
  71         quicktime_write_int32(file, mdhd->modification_time);
  72         quicktime_write_int32(file, mdhd->time_scale);
  73         quicktime_write_int32(file, mdhd->duration);
  74         quicktime_write_int16(file, mdhd->language);
  75         quicktime_write_int16(file, mdhd->quality);
  76
  77         quicktime_atom_write_footer(file, &atom);
  78 }
  79