iOS: Audio remote control, Now Playing info

Update the basic Now Playing info about the currently playing music, and respond to remote control commands.

Seems to work with MP3 but not other audio formats, probably because those are played via custom decoders. There must be some API for updating the playback status manually.

1 files changed, 85 insertions, 2 deletions

diff --git a/src/ios.m b/src/ios.m
index e7288677..b50f4ecb 100644
--- a/src/ios.m
+++ b/src/ios.m
@@ -22,6 +22,7 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
 
 #include "ios.h"
 #include "app.h"
+#include "audio/player.h"
 #include "ui/command.h"
 #include "ui/window.h"
 
@@ -32,9 +33,10 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
 #include <SDL_syswm.h>
 #include <SDL_timer.h>
 
-#import <UIKit/UIKit.h>
-#import <CoreHaptics/CoreHaptics.h>
 #import <AVFAudio/AVFAudio.h>
+#import <CoreHaptics/CoreHaptics.h>
+#import <UIKit/UIKit.h>
+#import <MediaPlayer/MediaPlayer.h>
 
 static iBool isSystemDarkMode_ = iFalse;
 static iBool isPhone_          = iFalse;
@@ -241,6 +243,55 @@ void setupApplication_iOS(void) {
                    name:UIKeyboardWillHideNotification
                  object:nil];
     [[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error:nil];
+    /* Media player remote controls. */
+    MPRemoteCommandCenter *commandCenter = [MPRemoteCommandCenter sharedCommandCenter];
+    [[commandCenter pauseCommand] addTargetWithHandler:^MPRemoteCommandHandlerStatus(MPRemoteCommandEvent * _Nonnull event) {
+        iPlayer *player = active_Player();
+        if (player) {
+            setPaused_Player(player, iTrue);
+            return MPRemoteCommandHandlerStatusSuccess;
+        }
+        return MPRemoteCommandHandlerStatusCommandFailed;
+    }];
+    [[commandCenter playCommand] addTargetWithHandler:^MPRemoteCommandHandlerStatus(MPRemoteCommandEvent * _Nonnull event) {
+        iPlayer *player = active_Player();
+        if (player) {
+            if (isPaused_Player(player)) {
+                setPaused_Player(player, iFalse);
+            }
+            else {
+                start_Player(player);
+            }
+            return MPRemoteCommandHandlerStatusSuccess;
+        }
+        return MPRemoteCommandHandlerStatusCommandFailed;
+    }];
+    [[commandCenter stopCommand] addTargetWithHandler:^MPRemoteCommandHandlerStatus(MPRemoteCommandEvent * _Nonnull event) {
+        iPlayer *player = active_Player();
+        if (player) {
+            stop_Player(player);
+            return MPRemoteCommandHandlerStatusSuccess;
+        }
+        return MPRemoteCommandHandlerStatusCommandFailed;
+    }];
+    [[commandCenter togglePlayPauseCommand] addTargetWithHandler:^MPRemoteCommandHandlerStatus(MPRemoteCommandEvent * _Nonnull event) {
+        iPlayer *player = active_Player();
+        if (player) {
+            setPaused_Player(player, !isPaused_Player(player));
+            return MPRemoteCommandHandlerStatusSuccess;
+        }
+        return MPRemoteCommandHandlerStatusCommandFailed;
+    }];
+    [[commandCenter nextTrackCommand] setEnabled:NO];
+    [[commandCenter previousTrackCommand] setEnabled:NO];
+    [[commandCenter changeRepeatModeCommand] setEnabled:NO];
+    [[commandCenter changeShuffleModeCommand] setEnabled:NO];
+    [[commandCenter changePlaybackRateCommand] setEnabled:NO];
+    [[commandCenter seekForwardCommand] setEnabled:NO];
+    [[commandCenter seekBackwardCommand] setEnabled:NO];
+    [[commandCenter skipForwardCommand] setEnabled:NO];
+    [[commandCenter skipBackwardCommand] setEnabled:NO];
+    [[commandCenter changePlaybackPositionCommand] setEnabled:NO];
 }
 
 static iBool isDarkMode_(iWindow *window) {
@@ -335,6 +386,38 @@ iBool processEvent_iOS(const SDL_Event *ev) {
     return iFalse; /* allow normal processing */
 }
 
+void updateNowPlayingInfo_iOS(void) {
+    const iPlayer *player = active_Player();
+    if (!player) {
+        clearNowPlayingInfo_iOS();
+        return;
+    }
+    NSMutableDictionary<NSString *, id> *info = [[NSMutableDictionary<NSString *, id> alloc] init];
+    [info setObject:[NSNumber numberWithDouble:time_Player(player)]
+            forKey:MPNowPlayingInfoPropertyElapsedPlaybackTime];
+    [info setObject:[NSNumber numberWithInt:MPNowPlayingInfoMediaTypeAudio]
+            forKey:MPNowPlayingInfoPropertyMediaType];
+    [info setObject:[NSNumber numberWithDouble:duration_Player(player)]
+             forKey:MPMediaItemPropertyPlaybackDuration];
+    const iString *title  = tag_Player(player, title_PlayerTag);
+    const iString *artist = tag_Player(player, artist_PlayerTag);
+    if (isEmpty_String(title)) {
+        title = collectNewCStr_String("Audio"); /* TODO: Use link label or URL file name */
+    }
+    if (isEmpty_String(artist)) {
+        artist = collectNewCStr_String("Lagrange"); /* TODO: Use domain or base URL */
+    }
+    [info setObject:[NSString stringWithUTF8String:cstr_String(title)]
+             forKey:MPMediaItemPropertyTitle];
+    [info setObject:[NSString stringWithUTF8String:cstr_String(artist)]
+             forKey:MPMediaItemPropertyArtist];
+    [[MPNowPlayingInfoCenter defaultCenter] setNowPlayingInfo:info];
+}
+
+void clearNowPlayingInfo_iOS(void) {
+    [[MPNowPlayingInfoCenter defaultCenter] setNowPlayingInfo:nil];
+}
+
 void exportDownloadedFile_iOS(const iString *path) {
     NSURL *url = [NSURL fileURLWithPath:[[NSString alloc] initWithCString:cstr_String(path)
                                                                  encoding:NSUTF8StringEncoding]];