Handling the redirection in the access core enables support for
redirection between different protocols (e.g. HTTP to FTP) and more
generally different access plugins (e.g. HTTP to HTTP2 in future).

This test compare IO output/returns between libc FILE functions and stream
functions.

This commit also add an extra test: 'test_src_input_stream_net' to test a http
file.

AStreamRefillStream shouldn't fail in case of EOF.
AStreamSeekStream shouldn't fail when no data can be cached after a seek.

And assert (debug only).

No functional changes

The mwait() call dereferenced a potentially no longer referenced picture
(if the display was filtered).

Change the audio device when the corresponding action is triggered, not
when it is modified... This completely broke ALSA playback.

This ensures that the default value ("default") for alsa-audio-device
is listed as a possible choice.

This shares the code between access_demux and demux cases.

Many existing demuxers do not use the generic control helper providing
those control queries. But as we now need to support those queries for
manifest-based or asynchronous demuxers, this fallback becomes
necessary.

We could also just do ahead and implement the controls in all demuxers.
Help yourself.

Some demuxers support seeking even if the underlying byte stream is not
seekable (e.g. subtitles). Also some demuxers do not support seeking
regardless of the underlying byte stream.

So it makes more sense to check the status from the demuxer. Most
demuxers just copy or forward the value from the byte stream.

Note: if in doubt, a demuxer can always claim seek support, and
eventually fail both DEMUX_SET_TIME and DEMUX_SET_POSITION. The seek is
only used as a hint for user interfaces; it has no effects on the input
thread as such.

Also document them.

This reverts commit fabb0362.

For some reasons, this was breaking Android toolchains

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>