This is more readable and makes it easier to reorder URLProtocol
members.

There's no particular reason to pollute the namespace with a typedef for
it.

Fix compilation on systems without poll()

And hide request_channels AVOption under it.

This way is possible to have simple micro-server act like

ffmpeg -i file.nut -vcodec copy -acodec copy -f nut tcp://foo:1234?listen

This way people will not get surprises regarding the current configure
behaviour and contributors will have a guideline on what is expected.

Support the URL_FLAG_NONBLOCK semantic and uniform the protocol.
The quick retry loop is already part of retry_transfer_wrapper.

The polling routine is common to the network protocols:
udp, tcp and, once merged, sctp.

Fix the breakage introduced with 9073ca6c

The replacement isn't ready yet.

Signed-off-by: Janne Grunau <janne-libav@jannau.net>

Fixes build with --disable-muxers --disable-network.

Thanks to Hendrik Leppkes for noticing.

thread_count passed to ff_thread_init() is only used to set AVCodecContext.
thread_count, and can be removed. Instead move it to the legacy implementation
of avcodec_thread_init().

This also fixes the problem that calling avcodec_thread_init() with pthreads
enabled did not set it since ff1efc52.
Signed-off-by: Janne Grunau <janne-libav@jannau.net>

This reverts commit 36864ac3 since it
breaks LATM decoding in ffplay.

Signed-off-by: Anton Khirnov <anton@khirnov.net>

Signed-off-by: Anton Khirnov <anton@khirnov.net>

It's not used anywhere internally.

Salvage its documentation for ffio_read_seek.

It's not used anywhere internally.

Salvage its documentation for ffio_read_pause.

Signed-off-by: Mans Rullgard <mans@mansr.com>

Signed-off-by: Mans Rullgard <mans@mansr.com>

URLContext.filename should be used directly.

URLContext.max_packet_size should be used directly.