On 7/21/2014 11:04 AM, Eric Rescorla wrote:
On Sun, Jul 20, 2014 at 5:06 PM, <[email protected]> wrote:
Hi everyone,
I was interested in modifying the Firefox implementation of WebRTC (for my
own purposes), specifically, adding the MPEG-4 FBA codec to the
implementation. I noticed that in the /media directory or Firefox source,
there is the WebRTC installation as well as several codec libraries.
I was wondering, how would I be able to add and use additional codec
libraries to the Firefox implementation of WebRTC?
You can use the Gecko Media Plugin facility recently landed in Firefox 33.
Note that to experiment with a different codec you could masquerade as
an H.264 GMP plugin (with your data hidden in what look like H.264
NALs). We use mode 1, which effectively lets you produce large binary
blobs of data that get fragmented by the RTP layer and reassembled for
you. Note that the code will make assumptions that the KeyFrame/etc
flags are set correctly.
To implement a full new codec requires a GMP plugin, and mods to the
media/webrtc/trunk/webrtc code (webrtc.org code in our tree) to
implement packetization/depacketization specific to that codec, and
smaller mods to media/webrtc/signaling/src/media to handle SDP
negotiation. Perhaps a few to signaling/src/media-conduit to handle
config parameters from SDP.
--
Randell Jesup, Mozilla
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