esri / swiftrtp

Swift implementation of RTP and the H264 RTP Profile

SwiftRTP

Swift 2 (iOS and Mac OS) implementation of RTP ("RTP: A Transport Protocol for Real-Time Applications") and the H264 RTP Profile ("RTP Payload Format for H.264 Video").

What Works

• Hardware acceleration of H264 decoding on (supported) iOS devices. (See the WWDC 2014 Session 513: "Direct Access to Video Encoding and Decoding).
• Live streaming of RTP H264 video from 3DRobotics Solo drone.
• Partial support of live streaming of ffmpeg rtp streams. Run a "test card" video stream using ffmpeg, the sample app will connect to it and display the card - (maybe with some corruption due to buggy STAP-A processing). (See Documentation/ folder for more info on ffmpeg)

ffmpeg -re -f lavfi -i smptebars -vcodec libx264 -tune zerolatency -vf scale=1920:1080 -b 900k -sdp_file stream.sdp -f rtp "rtp://127.0.0.1:5600"

What Does Not Work

• Check the liberal amount of // TODOs in the code.
• RTP padding, extensions and csrcs are not supported yet. If a RTP packet contains any of these elements it will be dropped.
• The STAP-A RTP H264 packet type is not tested well and doesn't seem to be reliable. Further work is needed.
• The following RTP H264 packet types are not yet supported:
  • FU-B
  • STAP-B
  • MTAP-A
  • MTAP-B

Future

• Fix items in the "What Does Not Work" section. The extra packet types are low priority. They're generally not seen coming either from 3DR Solo or from ffmpeg.
• Better support for handling SPS and PPS packets. It would be nice if the DecompressionSession class could handle changed parameters better.
• Preload SPS and PPS packets for "fast starts".
• Configure the RTP packet type. 96 (the first user-available type) is hard-coded.
• SDP file reader?
• Hooks for logging (don't log to println)
• For STAP and MTAP packets we should be calling CMSampleBufferCreate once for all samples in the packet.

swiftrtp's Issues

Dependencies no longer present

Carthage can't find any of the imported repositories.

Cannot update carthage - object 'develop' does not exist

When trying to update carthage for Swift 3.1, it is giving me the error "Failed to check out repository ...SwiftIO: No object named 'develop' exists.

This is due to schwa removing the develop branch of the SwiftIO library.

Can you please fix the cartfile for this library by updating the SwiftIO branch to 'master' instead of 'develop'

Thanks!

IOS recording error

in the mac is right.

but i need ios recording video.

excpetion:

MovieWriter.writer not ready for more media data.