DO NOT LAND - Hacked MSE mp3 support, assuming addSourceBuffer /mp4; codecs="mp4a.40.2"

DO NOT LAND - Hacked MSE mp3 support, assuming addSourceBuffer /mp4; codecs="mp4a.40.2"

This CL is NOT for production landing. It just demonstrates that decode
of mp3 in mp4 via MSE *can* work in Chrome. It disables a bunch of
checks and assumes mp3 when the mp4 stream parser finds some other audio
object type.

Seems to show pipeline can work with mp3 in mp4 in MSE - used hacked
version of https://chrisguttandin.github.io/mse-tests/ (just the MP3
inside of a MP4 container, with addSourceBuffer mimetype codec string
adjusted to non-MP3 mp4a.40.2 just to get past the existing checks.

Production version of a real fix will need, at least,
StreamParserFactory allowances for real mp3 codec strings, correct
adjustments to mp4 stream parser, and tests.

BUG=661749

[wolenetz, 2016-11-02 21:58:19]

Description was changed from

==========
DO NOT LAND - Hacked MSE mp3 support, assuming addSourceBuffer /mp4;
codecs="mp4a.40.2"

This CL is NOT for production landing. It just demonstrates that decode
of mp3 in mp4 via MSE *can* work in Chrome. It disables a bunch of
checks and assumes mp3 when the mp4 stream parser finds some other audio
object type.

Seems to show pipeline can work with mp3 in mp4 in MSE - used hacked
version of https://chrisguttandin.github.io/mse-tests/ (just the MP3
inside of a MP4 container, with addSourceBuffer mimetype codec string
adjusted to non-MP3 mp4a.40.2 just to get past the existing checks.

Production version of a real fix will need, at least,
StreamParserFactory allowances for real mp3 codec strings, correct
adjustments to mp4 stream parser, and tests.

BUG=661749
==========

to

==========
DO NOT LAND - Hacked MSE mp3 support, assuming addSourceBuffer /mp4;
codecs="mp4a.40.2"

This CL is NOT for production landing. It just demonstrates that decode
of mp3 in mp4 via MSE *can* work in Chrome. It disables a bunch of
checks and assumes mp3 when the mp4 stream parser finds some other audio
object type.

Seems to show pipeline can work with mp3 in mp4 in MSE - used hacked
version of https://chrisguttandin.github.io/mse-tests/ (just the MP3
inside of a MP4 container, with addSourceBuffer mimetype codec string
adjusted to non-MP3 mp4a.40.2 just to get past the existing checks.

Production version of a real fix will need, at least,
StreamParserFactory allowances for real mp3 codec strings, correct
adjustments to mp4 stream parser, and tests.

BUG=661749
==========