1022012 - Finalize initial pref-on API for GMP codecs

Status: RESOLVED DUPLICATE of bug 1020760

(Core :: Audio/Video, defect)

Description

[Randell Jesup [:jesup] (needinfo me)]

We need to finalize the API for codecs in the GMP sandbox, which may be shared by EME codecs.

For flexibility, in bug 9990704 I used an API similar to OpenMAX's (choice of single unit/NAL, or a set of units in one buffer with 1, 2, 3, or 4 byte size values between them.  This is more generic than the 'raw' H.264 encoder format often seen (start codes).

And H.264 encoder that generates a bunch of NALUs with start codes between them would replace the start codes with sizes, for example.

The other primary option would be a separate array of offsets and sizes into a main buffer, or (maybe) a list of separate buffers (but this might complicate the sandboxing compared to the single-buffer setup, and end up requiring copying more data around.)

Comment 1

[Chris Pearce [:cpearce (Not reading bugmail)]]

(In reply to Randell Jesup [:jesup] from comment #0)
> For flexibility, in bug 9990704 I used an API similar to OpenMAX's (choice
> of single unit/NAL, or a set of units in one buffer with 1, 2, 3, or 4 byte
> size values between them.  This is more generic than the 'raw' H.264 encoder
> format often seen (start codes).

As I understand it, this is AVCC format. That works for us, provided the NAL size's size is communicated out of band.

Comment 2

[Randell Jesup [:jesup] (needinfo me)]

All the work for this is happening in bug 1020760