demux/avio_crypto: add AES decryption#17908
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stream-lavf-o[cookies] only feeds the lavf stream backend. Instead of side-loading it, use core `--cookies-file` option.
Will be useful for future commits
Introduces stream_http, an internal libcurl-driven backend for http:// and https:// URLs. Runs all transfers on a dedicated curl multi thread with a producer-side ring buffer, and exposes HTTP/2 multiplexing, QUIC/HTTP/3 (when libcurl supports it), HSTS and TCP keep-alive. Should generally be more stable and faster than FFmpeg HTTP/1.1 impl, additionally connections are kept-alive between files open, so if you open playlist of network files and navigate through them, it will re-use the same connection. Build is gated on the new 'libcurl' meson option (auto). When disabled or unavailable, mpv silently falls back to FFmpeg's HTTP implementation.
Hook AVFormatContext.io_open so HLS/DASH segment fetches and other nested FFmpeg I/O go through stream_http when libcurl is available. This lets segments inherit the connection reuse, HTTP/2 multiplexing, mid-stream resume and conditional compression of the top-level stream. Falls back to FFmpeg's default I/O for non-HTTP URLs and when the curl backend is not built in.
Allow only subset of supported protocols by libcurl.
This is for stream_curl.
At the initial file open, the buffer may be populated with more data, than later requested by decoder, but don't drop this data. This fixes initial open to perform multiple reads of the area, especially for images that are likelly fully read for probbing already.
It's significantly more stable than Lavf. Fixes seeking out of cached ranges. Additionally correctly marks demuxer_is_network for ftp too.
This mirrors `crypto+` protocol from ffmpeg, which is used in HLS demuxer. Unfortunatelly ffmpeg doesn't use custom io_open in thier crypto.c, so we spin our own decryption.
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