Audio crash fix

Audio decoder loop creates a sorted map of available audio channels on the
fly. If neither user nor dvdnav intervene, it will pass the first (= lowest
index) audio channel to decoders.

Now imagine a TV recording with 2 audio channels:

audio.0: eac3 5.1 (fra)
audio.1: eac3 stereo (qaa)

By chance, first audio frame to be demuxed is for channel #1.
Track map will be

[0]: eac3, channel 1

Audio loop opens ffmpeg audio decoder / stereo out. Fine.

Then, first frame for channel #0 comes in.

[0]: eac3, channel 0
[1]: eac3, channel 1

Both are same codec, so audio loop just switches to channel 0 without
further notice. Audio decoder then runs into a mem leak, or worse, crashes
audio out who still thinks we're only stereo.

Whenever we insert something at track map index 0, and its going to be
auto-selected later, reset current codec type. This forces a clean
decoder/output switch.

0 files changed, 0 insertions, 0 deletions