options: add --network-timeout

Not quite sure if this actually works as intended.

Fixes #1566.

DOCS/man/options.rst

@@ -3135,6 +3135,11 @@ Network
 ``--referrer=<string>``
     Specify a referrer path or URL for HTTP requests.
 
+``--network-timeout=<seconds>``
+    Specify the network timeout in seconds. This affects at least HTTP. The
+    special value 0 (default) uses the FFmpeg/Libav defaults. If a protocol
+    is used which does not support timeouts, this option is silently ignored.
+
 ``--rtsp-transport=<lavf|udp|tcp|http>``
     Select RTSP transport method (default: tcp). This selects the underlying
     network transport when playing ``rtsp://...`` URLs. The value ``lavf``

options/options.c

@@ -173,6 +173,7 @@ const m_option_t mp_opts[] = {
                 {"http", 3})),
     OPT_FLAG("tls-verify", network_tls_verify, 0),
     OPT_STRING("tls-ca-file", network_tls_ca_file, M_OPT_FILE),
+    OPT_DOUBLE("network-timeout", network_timeout, M_OPT_MIN, .min = 0),
 
 // ------------------------- demuxer options --------------------
 
@@ -730,6 +731,7 @@ const struct MPOpts mp_default_opts = {
     .demuxer_min_bytes = 0,
     .demuxer_min_secs = 0.2,
     .network_rtsp_transport = 2,
+    .network_timeout = 0.0,
     .hls_bitrate = 2,
     .demuxer_min_secs_cache = 2,
     .cache_pausing = 1,

options/options.h

@@ -274,6 +274,7 @@ typedef struct MPOpts {
     char **network_http_header_fields;
     int network_tls_verify;
     char *network_tls_ca_file;
+    double network_timeout;
 
     struct tv_params *tv_params;
     struct pvr_params *stream_pvr_opts;

stream/stream_lavf.c

@@ -181,6 +181,9 @@ void mp_setup_av_network_options(AVDictionary **dict, struct mpv_global *global,
     if (strlen(cust_headers))
         av_dict_set(dict, "headers", cust_headers, 0);
     av_dict_set(dict, "icy", "1", 0);
+    // So far, every known protocol uses microseconds for this
+    if (opts->network_timeout > 0)
+        av_dict_set_int(dict, "timeout", opts->network_timeout * 1e6, 0);
 
     mp_set_avdict(dict, opts->stream_lavf_opts->avopts);