avplay: limit requested video-mode

In case the video geometry (WxH) is larger than the current size of
the framebuffer, match its size and let libav do the scaling. This
enables the playback of 1080p movies on smaller screens.

Issue #2583.

repos/libports/ports/libav.hash

@@ -1 +1 @@
-f0631cd5c85fe9c08ea236de0d062384798a0955
+e1e1614656d888a857f450f4315dcaa669569c42

repos/libports/src/app/avplay/avplay.patch

@@ -1,8 +1,9 @@
 - don't show status messages
 - fix audio/video synchronicity (needs more testing)
+- override requested video mode with size of the framebuffer
 
 +++ src/lib/libav/avplay.c
-@@ -235,7 +235,7 @@
+@@ -240,7 +240,7 @@
  };
  static int seek_by_bytes = -1;
  static int display_disable;
@@ -11,8 +12,25 @@
  static int av_sync_type = AV_SYNC_AUDIO_MASTER;
  static int64_t start_time = AV_NOPTS_VALUE;
  static int64_t duration = AV_NOPTS_VALUE;
-@@ -965,7 +965,7 @@
-                         2 * is->audio_st->codec->channels;
+@@ -902,6 +902,16 @@
+        && is->height== screen->h && screen->h == h)
+         return 0;
+ 
++    /* override geometry with framebuffer size */
++    SDL_Rect **modes = SDL_ListModes(NULL, flags);
++    if (modes == (SDL_Rect**)0) {
++        fprintf(stderr, "SDL: could not get mode list - exiting\n");
++        return -1;
++    }
++
++    w = modes[0]->w;
++    h = modes[0]->h;
++
+ #if defined(__APPLE__) && !SDL_VERSION_ATLEAST(1, 2, 14)
+     /* setting bits_per_pixel = 0 or 32 causes blank video on OS X and older SDL */
+     screen = SDL_SetVideoMode(w, h, 24, flags);
+@@ -962,7 +972,7 @@
+                         av_get_bytes_per_sample(is->sdl_sample_fmt);
      }
      if (bytes_per_sec)
 -        pts -= (double)hw_buf_size / bytes_per_sec;