#VideoCore

VideoCore is a project inteded to be an audio and video manipulation and streaming graph. It currently works with iOS and periodic (live) sources. It is a work in progress and will eventually expand to other platforms such as OS X and Android. Contributors welcome!

###Table of Contents

• Setup
• Projects Using VideoCore
• Architecture Overview
• Version History

##Setup

####CocoaPods

Create a Podfile with the contents

platform :ios, '6.0'
pod 'VideoCore', '~> 0.2.0'

Next, run pod install and open the xcworkspace file that is created.

####Sample Application The SampleBroadcaster project in the sample folder uses CocoaPods to bring in VideoCore as a dependency:

cd sample/SampleBroadcaster
pod install
open SampleBroadcaster.xcworkspace

... or you can build from the command-line:

xcodebuild -workspace SampleBroadcaster.xcworkspace -scheme SampleBroadcaster build

More on CocoaPods: https://cocoapods.org/

##Architecture Overview

VideoCore's architecture is inspired by Microsoft Media Foundation (except with saner naming). Samples start at the source, are passed through a series of transforms, and end up at the output.

e.g. Source (Camera) -> Transform (Composite) -> Transform (H.264 Encode) -> Transform (RTMP Packetize) -> Output (RTMP)

videocore/
sources/
videocore::ISource
videocore::IAudioSource : videocore::ISource
videocore::IVideoSource : videocore::ISource
videocore::Watermark : videocore:IVideoSource
iOS/
videocore::iOS::CameraSource : videocore::IVideoSource
Apple/
videocore::Apple::MicrophoneSource : videocore::IAudioSource
OSX/
videocore::OSX::DisplaySource : videocore::IVideoSource
videocore::OSX::SystemAudioSource : videocore::IAudioSource
outputs/
videocore::IOutput
videocore::ITransform : videocore::IOutput
iOS/
videocore::iOS::H264Transform : videocore::ITransform
videocore::iOS::AACTransform  : videocore::ITransform
OSX/
videocore::OSX::H264Transform : videocore::ITransform
videocore::OSX::AACTransform  : videocore::ITransform
RTMP/
videocore::rtmp::H264Packetizer : videocore::ITransform
videocore::rtmp::AACPacketizer : videocore::ITransform

mixers/
videocore::IMixer
videocore::IAudioMixer : videocore::IMixer
videocore::IVideoMixer : videocore::IMixer
videocore::AudioMixer : videocore::IAudioMixer
iOS/
videocore::iOS::GLESVideoMixer : videocore::IVideoMixer
OSX/
videocore::OSX::GLVideoMixer : videocore::IVideoMixer

rtmp/
videocore::RTMPSession : videocore::IOutput

stream/
videocore::IStreamSession
Apple/
videocore::Apple::StreamSession : videocore::IStreamSession

##Version History

• 0.3.1
  • Various bugfixes
  • Introduction of pixel buffer sources so you can add images to broadcast.
• 0.3.0
  • Improvements to audio/video timestamps and synchronization
  • Adds an incompatible API call with previous versions. Custom
  • graphs must now call IMixer::start() to begin mixing.
• 0.2.3
  • Add support for image filters
• 0.2.2
  • Fix video streaking bug when adaptative bitrate is enabled
  • Increase the aggressiveness of the adaptative bitrate algorithm
  • Add internal pixel buffer format
• 0.2.0
  • Removes deprecated functions
  • Adds Main Profile video
  • Improves adaptive bitrate algorithm
• 0.1.12
  • Bugfixes
  • Red5 support
  • Improved Adaptive Bitrate algorithm
• 0.1.10
  • Bugfixes
  • Adaptive Bitrate introduced
• 0.1.9
  • Bugfixes, memory leak fixes
  • Introduces the ability to choose whether to use interface orientation or device orientation for Camera orientation.
• 0.1.8
  • Introduces VideoToolbox encoding for iOS 8+ and OS X 10.9+
  • Adds -lc++ for compatibility with Xcode 6
• 0.1.7
  • Add a simplified iOS API for the common case of streaming camera/microphone
  • Deprecate camera aspect ratio and position
  • Add a matrix transform for Position
  • Add a matrix transform for Aspect Ratio
  • Bugfixes
• 0.1.6
  • Use device orientation for CameraSource rather than interface orientation
• 0.1.5
  • Add aspect fill to CameraSource
• 0.1.4
  • Switch from LGPL 2.1 to MIT licensing.
  • Add Camera preview layer.
  • Add front/back camera toggle.
  • Fix aspect ratio bug in Camera source.
• 0.1.3
  • Update sample app with a more efficient viewport render
• 0.1.2
  • Fixes a serious bug in the GenericAudioMixer that was causing 100% cpu usage and audio lag.
• 0.1.1
  • Fixes Cocoapods namespace conflicts for UriParser-cpp
• 0.1.0
  • Initial CocoaPods version