Media: support song detection on macOS

CMakeLists.txt

@@ -189,7 +189,6 @@ set(LIBFASTFETCH_SRC
     src/detection/gtk.c
     src/detection/terminalShell.c
     src/detection/vulkan.c
-    src/detection/media.c
     src/detection/datetime.c
     src/detection/temps.c
     src/detection/title.c
@@ -253,6 +252,7 @@ if(APPLE)
         src/detection/terminalfont/terminalfont_apple.c
         src/util/apple/cfdict_helpers.c
         src/util/apple/osascript.m
+        src/detection/media/media_apple.m
     )
 elseif(ANDROID)
     list(APPEND LIBFASTFETCH_SRC
@@ -264,6 +264,7 @@ elseif(ANDROID)
         src/detection/memory/memory_linux.c
         src/detection/displayserver/displayserver_android.c
         src/detection/terminalfont/terminalfont_android.c
+        src/detection/media/media_linux.c
     )
 else()
     list(APPEND LIBFASTFETCH_SRC
@@ -279,6 +280,7 @@ else()
         src/detection/displayserver/linux/xlib.c
         src/detection/displayserver/linux/wmde.c
         src/detection/terminalfont/terminalfont_linux.c
+        src/detection/media/media_linux.c
     )
 endif()
 

src/detection/media.h → src/detection/media/media.h

@@ -13,6 +13,7 @@ typedef struct FFMediaResult
     FFstrbuf artist;
     FFstrbuf album;
     FFstrbuf url;
+    const char* error;
 } FFMediaResult;
 
 const FFMediaResult* ffDetectMedia(FFinstance* instance);

src/detection/media/media_apple.m

@@ -0,0 +1,63 @@
+#include "fastfetch.h"
+#include "detection/media/media.h"
+#include "common/library.h"
+#include "util/apple/cfdict_helpers.h"
+
+#import <pthread.h>
+#import <Foundation/Foundation.h>
+#import <CoreFoundation/CoreFoundation.h>
+
+void MRMediaRemoteGetNowPlayingInfo(dispatch_queue_t dispatcher, void(^callback)(_Nullable CFDictionaryRef info));
+
+const char* getMedia(FFMediaResult* result)
+{
+    ffStrbufInit(&result->busNameShort);
+    ffStrbufInit(&result->player);
+    ffStrbufInit(&result->song);
+    ffStrbufInit(&result->artist);
+    ffStrbufInit(&result->album);
+    ffStrbufInit(&result->url);
+
+    FFstrbuf fake;
+    ffStrbufInitA(&fake, 0);//MediaRemote is a macOS builtin framework thus its path should not change
+
+    FF_LIBRARY_LOAD(
+        MediaRemote,
+        fake,
+        "dlopen MediaRemote failed",
+        "/System/Library/PrivateFrameworks/MediaRemote.framework/MediaRemote",
+        1);
+    FF_LIBRARY_LOAD_SYMBOL_MESSAGE(MediaRemote, MRMediaRemoteGetNowPlayingInfo);
+    dispatch_semaphore_t semaphore = dispatch_semaphore_create(0);
+    ffMRMediaRemoteGetNowPlayingInfo(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0), ^(_Nullable CFDictionaryRef info) {
+        if(info != nil) {
+            ffCfDictGetString(info, CFSTR("kMRMediaRemoteNowPlayingInfoTitle"), &result->song);
+            ffCfDictGetString(info, CFSTR("kMRMediaRemoteNowPlayingInfoArtist"), &result->artist);
+            ffCfDictGetString(info, CFSTR("kMRMediaRemoteNowPlayingInfoAlbum"), &result->album);
+        }
+        dispatch_semaphore_signal(semaphore);
+    });
+    dispatch_semaphore_wait(semaphore, DISPATCH_TIME_FOREVER);
+    return NULL;
+}
+
+const FFMediaResult* ffDetectMedia(FFinstance* instance)
+{
+    FF_UNUSED(instance)
+    static FFMediaResult result;
+    static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
+    static bool init = false;
+
+    if(!init)
+    {
+        pthread_mutex_lock(&mutex);
+        if(!init)
+        {
+            result.error = getMedia(&result);
+            init = true;
+        }
+        pthread_mutex_unlock(&mutex);
+    }
+
+    return &result;
+}

src/detection/media.c → src/detection/media/media_linux.c

@@ -1,5 +1,5 @@
 #include "fastfetch.h"
-#include "detection/media.h"
+#include "detection/media/media.h"
 
 #include <string.h>
 #include <pthread.h>

src/modules/player.c

@@ -1,6 +1,6 @@
 #include "fastfetch.h"
 #include "common/printing.h"
-#include "detection/media.h"
+#include "detection/media/media.h"
 
 #include <ctype.h>
 

src/modules/song.c

@@ -1,6 +1,6 @@
 #include "fastfetch.h"
 #include "common/printing.h"
-#include "detection/media.h"
+#include "detection/media/media.h"
 
 #include <ctype.h>
 

src/util/apple/cfdict_helpers.c

@@ -1,6 +1,6 @@
 #include "cfdict_helpers.h"
 
-bool ffCfDictGetString(CFMutableDictionaryRef dict, CFStringRef key, FFstrbuf* result)
+bool ffCfDictGetString(CFDictionaryRef dict, CFStringRef key, FFstrbuf* result)
 {
     CFTypeRef cf = (CFTypeRef)CFDictionaryGetValue(dict, key);
     if(cf == NULL)
@@ -10,12 +10,13 @@ bool ffCfDictGetString(CFMutableDictionaryRef dict, CFStringRef key, FFstrbuf* r
     {
         CFStringRef cfStr = (CFStringRef)cf;
         uint32_t length = (uint32_t)CFStringGetLength(cfStr);
-        ffStrbufEnsureFree(result, length + 1);
-        if(CFStringGetCString(cfStr, result->chars, length + 1, kCFStringEncodingASCII))
+        //CFString stores UTF16 characters, therefore may require larger buffer to convert to UTF8 string
+        ffStrbufEnsureFree(result, length * 2);
+        if(CFStringGetCString(cfStr, result->chars, result->allocated, kCFStringEncodingUTF8))
         {
-            result->length = length;
             // CFStringGetCString ensures the buffer is NUL terminated
             // https://developer.apple.com/documentation/corefoundation/1542721-cfstringgetcstring
+            result->length = strnlen(result->chars, (uint32_t)result->allocated);
         }
     }
     else if(CFGetTypeID(cf) == CFDataGetTypeID())
@@ -34,7 +35,7 @@ bool ffCfDictGetString(CFMutableDictionaryRef dict, CFStringRef key, FFstrbuf* r
     return true;
 }
 
-bool ffCfDictGetBool(CFMutableDictionaryRef dict, CFStringRef key, bool* result)
+bool ffCfDictGetBool(CFDictionaryRef dict, CFStringRef key, bool* result)
 {
     CFBooleanRef cf = (CFBooleanRef)CFDictionaryGetValue(dict, key);
     if(cf == NULL || CFGetTypeID(cf) != CFBooleanGetTypeID())
@@ -44,7 +45,7 @@ bool ffCfDictGetBool(CFMutableDictionaryRef dict, CFStringRef key, bool* result)
     return true;
 }
 
-bool ffCfDictGetInt(CFMutableDictionaryRef dict, CFStringRef key, int* result)
+bool ffCfDictGetInt(CFDictionaryRef dict, CFStringRef key, int* result)
 {
     CFNumberRef cf = (CFNumberRef)CFDictionaryGetValue(dict, key);
     if (cf == NULL || CFGetTypeID(cf) != CFNumberGetTypeID())

src/util/apple/cfdict_helpers.h

@@ -6,8 +6,8 @@
 #include "fastfetch.h"
 #include <CoreFoundation/CoreFoundation.h>
 
-bool ffCfDictGetString(CFMutableDictionaryRef dict, CFStringRef key, FFstrbuf* result);
-bool ffCfDictGetBool(CFMutableDictionaryRef dict, CFStringRef key, bool* result);
-bool ffCfDictGetInt(CFMutableDictionaryRef dict, CFStringRef key, int* result);
+bool ffCfDictGetString(CFDictionaryRef dict, CFStringRef key, FFstrbuf* result);
+bool ffCfDictGetBool(CFDictionaryRef dict, CFStringRef key, bool* result);
+bool ffCfDictGetInt(CFDictionaryRef dict, CFStringRef key, int* result);
 
 #endif