An extension on AVPlayer which converts it to have all useful features of AVAudioPlayer but with streaming support. Also added additional methods to support Audio visualization from AVPlayer streaming. This extension adds some missing features to AVPlayer.
This projects shows a simple example on how to use it. ViewController has a UIProgressView which displays averagePower as a volume meter while streaming an audio through AVPlayer. This is very similar to how we would normally use AVAudioPlayer, but with some additional methods which makes it easy to display the averagePower. audioPCMBufferFetchedWithCallbackBlock can be used to fetch AVAudioPCMBuffer which can be used for Audio Visualization. Added stop method to stop player.
Carthage or Cocoapods can be used to integrate this to a project.
github "akhilcb/ACBAVPlayerExtension" ~> 2.1
pod 'ACBAVPlayer'
@property (nonatomic, readonly, assign) int numberOfChannels;
//stop video
- (void)stop;
/* metering */
@property (nonatomic, getter=isMeteringEnabled) BOOL meteringEnabled; /* turns level metering on or off. default is off. */
- (void)updateMeters; /* call to refresh meter values */
- (float)peakPowerForChannel:(NSUInteger)channelNumber; /* for peak power in decibels for a given channel. returns average power for now */
- (float)averagePowerForChannel:(NSUInteger)channelNumber; /* returns average power in decibels for a given channel */
//use this to repeatedly fetch average power list(in decibels) for all channels in iMeteringCallbackBlock. This block will be executed each time a value is fetched. Index of array is channel number
- (void)averagePowerListWithCallbackBlock:(ACBAVPlayerMeteringBlock)iMeteringCallbackBlock;
- (float)averagePowerInLinearFormForChannel:(NSUInteger)channelNumber; //returns in average power in linear form. Value is in between 0 to 1.
//fetch average power list in linear form(values in between 0 and 1)
- (void)averagePowerListInLinearFormWithCallbackBlock:(ACBAVPlayerMeteringBlock)iMeteringCallbackBlock;
//fetch AVAudioPCMBuffer. it has useful methods to manipuate buffers or to display a visualizer
- (void)audioPCMBufferFetchedWithCallbackBlock:(ACBAVPlayerBufferFetchedBlock)iAudioBufferFetchedBlock;
- (void)replaceCurrentItemAndUpdateMeteringForPlayerItem:(AVPlayerItem *)item; //use this instead of "replaceCurrentItemWithPlayerItem" for metering to work.
Note: This is a beta version. There could be some issues(Hopefully minor). Use at your own risk.
self.player = [[AVPlayer alloc] initWithURL:remoteURL];
self.player.meteringEnabled = true;
[self.player averagePowerListInLinearFormWithCallbackBlock:^(NSArray *iAvgPowerList, BOOL iSuccess) {
if (iAvgPowerList.count > 0) {
double power = [iAvgPowerList[0] doubleValue];
if (iAvgPowerList.count > 1) {
double secondPower = [iAvgPowerList[1] doubleValue];
power = (power + secondPower) / 2;
}
dispatch_async(dispatch_get_main_queue(), ^{
[self.progressBar setProgress:(power * 10)];
});
}
}];
MIT License
Copyright (c) 2017, Akhil C Balan(https://github.com/akhilcb)
All rights reserved.