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+/*****************************************************************************
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+ * VLCTranscoder.m: VLCKit.framework VLCTranscoder implementation
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+ *****************************************************************************
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+ * Copyright (C) 2018 Carola Nitz
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+ * Copyright (C) 2018 VLC authors and VideoLAN
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+ * $Id$
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+ *
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+ * Authors: Carola Nitz <caro # videolan.org>
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+ *
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+ * This program is free software; you can redistribute it and/or modify it
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+ * under the terms of the GNU Lesser General Public License as published by
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+ * the Free Software Foundation; either version 2.1 of the License, or
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+ * (at your option) any later version.
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+ *
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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU Lesser General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU Lesser General Public License
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+ * along with this program; if not, write to the Free Software Foundation,
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+ * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
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+ *****************************************************************************/
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+#import "VLCTranscoder.h"
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+
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+#import "VLCEventManager.h"
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+#import "VLCLibrary.h"
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+#import "VLCLibVLCBridging.h"
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+
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+#include <vlc/vlc.h>
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+
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+@interface VLCTranscoder()
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+{
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+ libvlc_media_player_t *_p_mp; //player instance used for transcoding
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+ dispatch_queue_t _libVLCTranscoderQueue;
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+}
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+- (void)registerObserversForMuxWithPlayer:(libvlc_media_player_t *)player;
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+- (void)unregisterObserversForMuxWithPlayer:(libvlc_media_player_t *)player;
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+@end
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+
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+@implementation VLCTranscoder
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+
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+- (instancetype)init
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+{
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+ if (self = [super init]) {
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+ _libVLCTranscoderQueue = dispatch_queue_create("libVLCTranscoderQueue", DISPATCH_QUEUE_SERIAL);
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+ }
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+ return self;
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+}
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+
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+- (BOOL)reencodeAndMuxSRTFile:(NSString *)srtPath toMP4File:(NSString *)mp4Path outputPath:(NSString *)outPath
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+{
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+ libvlc_media_t* p_media = libvlc_media_new_path([[VLCLibrary sharedLibrary] instance], [mp4Path UTF8String]);
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+ if (p_media == NULL) {
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+ NSAssert(0, @"p_media wasn't allocated");
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+ return NO;
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+ }
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+ NSString *transcodingOptions = [NSString stringWithFormat:@":sout=#transcode{venc={module=avcodec{codec=h264_videotoolbox}, vcodec=h264},venc={module=vpx{quality-mode=2},vcodec=VP80},samplerate=44100,soverlay}:file{dst='%@',mux=mkv}", outPath];
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+ libvlc_media_add_option(p_media, [[NSString stringWithFormat:@"--sub-file=%@", srtPath] UTF8String]);
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+ libvlc_media_add_option(p_media, [transcodingOptions UTF8String]);
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+
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+ _p_mp = libvlc_media_player_new_from_media( p_media );
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+ if (_p_mp == NULL) {
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+ NSAssert(0, @"_p_mp wasn't allocated");
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+ return NO;
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+ }
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+
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+ [self registerObserversForMuxWithPlayer:_p_mp];
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+ BOOL canPlay = libvlc_media_player_play( _p_mp ) == 0;
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+ if (!canPlay) {
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+ NSAssert(0, @"playback failed");
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+ [self unregisterObserversForMuxWithPlayer:_p_mp];
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+ return NO;
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+ }
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+ return canPlay;
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+}
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+
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+- (void)registerObserversForMuxWithPlayer:(libvlc_media_player_t *)player
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+{
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+ __block libvlc_event_manager_t * p_em = libvlc_media_player_event_manager(player);
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+ if (!p_em)
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+ return;
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+ CFBridgingRetain(self);
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+ dispatch_sync(_libVLCTranscoderQueue,^{
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+ libvlc_event_attach(p_em, libvlc_MediaPlayerPaused,
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+ HandleMuxMediaInstanceStateChanged, (__bridge void *)(self));
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+ libvlc_event_attach(p_em, libvlc_MediaPlayerStopped,
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+ HandleMuxMediaInstanceStateChanged, (__bridge void *)(self));
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+ libvlc_event_attach(p_em, libvlc_MediaPlayerEncounteredError,
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+ HandleMuxMediaInstanceStateChanged, (__bridge void *)(self));
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+ });
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+}
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+
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+- (void)unregisterObserversForMuxWithPlayer:(libvlc_media_player_t *)player
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+{
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+ libvlc_event_manager_t * p_em = libvlc_media_player_event_manager(player);
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+ if (!p_em)
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+ return;
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+ dispatch_sync(_libVLCTranscoderQueue,^{
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+ libvlc_event_detach(p_em, libvlc_MediaPlayerStopped,
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+ HandleMuxMediaInstanceStateChanged, (__bridge void *)(self));
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+ libvlc_event_detach(p_em, libvlc_MediaPlayerPaused,
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+ HandleMuxMediaInstanceStateChanged, (__bridge void *)(self));
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+ libvlc_event_detach(p_em, libvlc_MediaPlayerEncounteredError,
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+ HandleMuxMediaInstanceStateChanged, (__bridge void *)(self));
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+ });
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+ CFBridgingRelease((__bridge CFTypeRef _Nullable)(self));
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+}
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+
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+- (void)mediaPlayerStateChangeForMux:(NSNumber *)newState
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+{
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+ if (_p_mp) {
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+ [self unregisterObserversForMuxWithPlayer:_p_mp];
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+ libvlc_media_player_stop( _p_mp );
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+ if (self.delegate && [self.delegate respondsToSelector:@selector(transcode:finishedSucessfully:)]) {
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+ BOOL success = ![newState isEqualToNumber: @(VLCMediaPlayerStateError)];
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+ [self.delegate transcode:self finishedSucessfully:success];
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+ }
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+ }
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+}
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+
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+static void HandleMuxMediaInstanceStateChanged(const libvlc_event_t * event, void * self)
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+{
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+ VLCMediaPlayerState newState;
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+ if (event->type == libvlc_MediaPlayerPaused) {
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+ newState = VLCMediaPlayerStatePaused;
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+ } else if(event->type == libvlc_MediaPlayerStopped) {
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+ newState = VLCMediaPlayerStateStopped;
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+ } else {
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+ newState = VLCMediaPlayerStateError;
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+ }
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+ @autoreleasepool {
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+ [[VLCEventManager sharedManager] callOnMainThreadObject:(__bridge id)(self)
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+ withMethod:@selector(mediaPlayerStateChangeForMux:)
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+ withArgumentAsObject:@(newState)];
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+ }
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+}
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+
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+- (void)dealloc
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+{
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+ libvlc_media_player_release(_p_mp);
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+}
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+@end
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Carola Nitz