Allegro video addon

Kamil Biały

Hi!

I have a little problem ( at least I think so ), so... I have no idea how to play video with allegro video streaming addon. I try something like this.

#SelectExpand
  1#include <stdio.h>
  2#include <allegro5/allegro.h>
  3#include <allegro5/allegro_audio.h>
  4#include <allegro5/allegro_acodec.h>
  5#include <allegro5/allegro_video.h>
  6
  7int main(int argc, char **argv){
  8
  9   ALLEGRO_DISPLAY *display = NULL;
 10   ALLEGRO_MIXER *mixer = NULL;
 11   ALLEGRO_VIDEO *video = NULL;
 12   ALLEGRO_BITMAP *bitmap = NULL;
 13   int x = 0;
 14
 15   if(!al_init()) {
 16      fprintf(stderr, "failed to initialize allegro!\n");
 17      return -1;
 18   }
 19
 20   al_install_audio( );
 21   al_init_acodec_addon( );
 22
 23    mixer = al_create_mixer(44100, ALLEGRO_AUDIO_DEPTH_FLOAT32, ALLEGRO_CHANNEL_CONF_2);
 24    video = al_open_video("video.ogg");
 25    al_set_new_bitmap_flags( ALLEGRO_VIDEO_BITMAP );
 26    bitmap = al_create_bitmap( al_get_video_width( video ), al_get_video_height( video ) );
 27
 28   display = al_create_display(al_get_video_width( video ), al_get_video_height( video ));
 29   if(!display) {
 30      fprintf(stderr, "failed to create display!\n");
 31      return -1;
 32   }
 33
 34
 35   al_clear_to_color(al_map_rgb(0,0,0));
 36
 37   al_flip_display();
 38        al_start_video(video,mixer);
 39    /*
 40    for( x = 0; x < 100; ++x )
 41    {
 42        bitmap = al_get_video_frame(video);
 43
 44        printf("%d", al_get_video_position(video, 0));
 45    }
 46    */
 47    bitmap = al_get_video_frame( video );
 48    al_draw_bitmap( bitmap, 0, 0, 0 );
 49
 50    al_rest( 5.0 );
 51
 52   al_destroy_display(display);
 53   al_destroy_mixer( mixer );
 54   al_destroy_bitmap( bitmap );
 55   al_close_video( video );
 56
 57   return 0;
 58}

But when i try to draw bitmap, it flush me an error to console:

#SelectExpand
 1Assertion failed: bitmap, file C:\allegro\src\bitmap_draw.c, line 137
 2
 3This application has requested the Runtime to terminate it in an unusual way.
 4Please contact the application's support team for more information.
 5
 6Process returned 3 (0x3)   execution time : 9.499 s
 7Press any key to continue.

Please, help.
I,m using allegro 5.1.6

SiegeLord

That should work, I think. Try opening the video (we really should rename it to load_video) after you create the display. Also, check to make sure your video is loaded fine (al_open_video will return NULL if not).

Kamil Biały

It doesn't work.
The video is opening, because it create display in video dimensions.
The problem starts when I try to get a video frame.

I try to add image addon, but it doesn't help...

SiegeLord

Looks like the first couple frames are NULL for whatever reason... just trudge along until you get a non-NULL one.

Another couple of things about your code... you are leaking memory when you create the bitmap yourself... you don't need to do that, al_get_video_frame handles the bitmap it returns automatically. Along the same lines, do not call al_destroy_bitmap on the bitmap returned by al_get_video_frame. Lastly, you don't need to create a default mixer unless you really have to. You can get a default one via al_get_default_mixer(). Your mixer wasn't working anyway as you didn't attach it to a voice. Here's the fixed code if you want to try it:

#SelectExpand
  1#include <stdio.h>
  2#include <allegro5/allegro.h>
  3#include <allegro5/allegro_audio.h>
  4#include <allegro5/allegro_video.h>
  5
  6int main(int argc, char** argv)
  7{
  8  ALLEGRO_DISPLAY* display = NULL;
  9  ALLEGRO_VIDEO* video = NULL;
 10  ALLEGRO_BITMAP* bitmap = NULL;
 11  int x = 0;
 12
 13  if(!al_init())
 14  {
 15    fprintf(stderr, "failed to initialize allegro!\n");
 16    return -1;
 17  }
 18
 19  al_install_audio();
 20  al_reserve_samples(1);
 21
 22  display = al_create_display(al_get_video_width(video), al_get_video_height(video));
 23
 24  if(!display)
 25  {
 26    fprintf(stderr, "failed to create display!\n");
 27    return -1;
 28  }
 29
 30  al_clear_to_color(al_map_rgb(0, 0, 0));
 31  al_flip_display();
 32
 33  video = al_open_video("video.ogg");
 34  al_start_video(video, al_get_default_mixer());
 35
 36  for(x = 0; x < 100; ++x)
 37  {
 38    bitmap = al_get_video_frame(video);
 39
 40    if(bitmap)
 41      al_draw_bitmap(bitmap, 0, 0, 0);
 42    else
 43      printf("NULL\n");
 44
 45    printf("%f\n", al_get_video_position(video, 0));
 46    al_flip_display();
 47    al_rest(0.01);
 48  }
 49
 50  al_destroy_display(display);
 51  al_close_video(video);
 52  return 0;
 53}

Kamil Biały

It... works! Wow

Thank you for help

Thread #612410. Printed from Allegro.cc