the last parameter of XChangeProperty is the number of elements.. and when the element format is 32.. the element is "long" so we have 5 long elements here.

Yes this seems confusing as on mac+linux Long is either 32 or 64bits depending on the architecture, but this is how the X11 protocol is defined. Thus 5 is the correct value for the nelts here. Not 5 or 10 depending on the architecture. More info on the confusion https://bugs.freedesktop.org/show_bug.cgi?id=16802
2026-04-28 20:37:24 +02:00 · 2015-02-10 16:28:56 -05:00
commit b88ca1b4a6
1638 changed files with 474135 additions and 0 deletions
--- a/test/testaudioinfo.c
+++ b/test/testaudioinfo.c
@@ -0,0 +1,70 @@
+/*
+  Copyright (C) 1997-2014 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely.
+*/
+#include <stdio.h>
+#include "SDL.h"
+
+static void
+print_devices(int iscapture)
+{
+    const char *typestr = ((iscapture) ? "capture" : "output");
+    int n = SDL_GetNumAudioDevices(iscapture);
+
+    SDL_Log("%s devices:\n", typestr);
+
+    if (n == -1)
+        SDL_Log("  Driver can't detect specific %s devices.\n\n", typestr);
+    else if (n == 0)
+        SDL_Log("  No %s devices found.\n\n", typestr);
+    else {
+        int i;
+        for (i = 0; i < n; i++) {
+            SDL_Log("  %s\n", SDL_GetAudioDeviceName(i, iscapture));
+        }
+        SDL_Log("\n");
+    }
+}
+
+int
+main(int argc, char **argv)
+{
+    int n;
+
+    /* Enable standard application logging */
+    SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
+
+    /* Load the SDL library */
+    if (SDL_Init(SDL_INIT_AUDIO) < 0) {
+        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't initialize SDL: %s\n", SDL_GetError());
+        return (1);
+    }
+
+    /* Print available audio drivers */
+    n = SDL_GetNumAudioDrivers();
+    if (n == 0) {
+        SDL_Log("No built-in audio drivers\n\n");
+    } else {
+        int i;
+        SDL_Log("Built-in audio drivers:\n");
+        for (i = 0; i < n; ++i) {
+            SDL_Log("  %s\n", SDL_GetAudioDriver(i));
+        }
+        SDL_Log("\n");
+    }
+
+    SDL_Log("Using audio driver: %s\n\n", SDL_GetCurrentAudioDriver());
+
+    print_devices(0);
+    print_devices(1);
+
+    SDL_Quit();
+    return 0;
+}