转场
更新时间：2020-12-11
- 转场的相关接口在VideoProducer.framewrok中RMVPMediaTrack.h头文件。
添加基础转场
- 添加基础转场，目前支持淡入、闪黑、闪白、模糊、横滑、纵滑。添加转场，需要传入媒体轨道上插入点(即，片段相应位置，这里可参考转场UI逻辑)
- 代码示例如下：
//创建转场效果实例，这里以读取本地配置文件为例
NSString *name = [NSString stringWithFormat:@"bundle/%@.zip",转场唯一签名];
NSString *path = [[[NSBundle mainBundle]resourcePath] stringByAppendingPathComponent:name];
BOOL isExist = [[NSFileManager defaultManager] fileExistsAtPath:path];
//解压
if (isExist) {
NSString *destPath = [self localPath];
destPath = [destPath stringByAppendingPathComponent:item.sign];
BOOL bSucess = [self unzipStickerPackage:path destPath:destPath];
if (bSucess) {
// 读取json文件
NSString *jsonPath = [destPath stringByAppendingPathComponent:@"transition_config.json"];
BOOL isJsonExist = [[NSFileManager defaultManager] fileExistsAtPath:jsonPath];
if (isJsonExist) {
NSData *data=[NSData dataWithContentsOfFile:jsonPath];
NSError *error;
NSDictionary *jsonDict =[NSJSONSerialization JSONObjectWithData:data
options:NSJSONReadingAllowFragments
error:&error];
if(jsonDict != nil && jsonDict.count > 0) {
NSString *library_name = @"library_name";
NSString *vertex_function = @"vertex_function";
NSString *fragment_function = @"fragment_function";
NSString *durationKey = @"duration";
NSString *library = [jsonDict objectForKey:library_name];
NSString *libraryPath = [destPath stringByAppendingPathComponent:library];
if (![[NSFileManager defaultManager] fileExistsAtPath:libraryPath]) {
return nil;
}
NSString *vertexShaderName = [jsonDict objectForKey:vertex_function];
NSString *fragmentShaderName = [jsonDict objectForKey:fragment_function];
CGFloat defaultDuration = 0.5 * 1000;
CGFloat duration = [jsonDict hk_floatForKey:durationKey];
if (duration <0.01) {
duration = defaultDuration;
}
//创建转场效果实例
RMVPMediaVideoTransitionItem *mediaItem = [[RMVPMediaVideoTransitionItem alloc] initWithType:RMVPMediaVideoTransitionItemTypeDual transitionType:RMVPMediaVideoTransitionItemTypeTransitionTypeDefault libraryPath:libraryPath vertexFunctionName:vertexShaderName fragmentFunctionName:fragmentShaderName];
mediaItem.duration = CMTimeMakeWithSeconds(duration / 1000, NSEC_PER_SEC);
mediaItem.transitionId = item.transition_id;
}
}
}
}
//删除原有转场效果
[self.videoTrack removeTransitionItemAtIndex:index];
//绑定最新转场效果
[self.videoTrack bindTransitionItem:mediaItem atIndex:index];