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avformat/hls: enable http_multiple only for http/1.1 servers

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Some http/1.0 implementations, like python's SimpleHTTPServer, can only support one client connection at a time. Making a second request while the first is still connected leads to a deadlock.

This change enables multiple connections for http/1.1 servers only, which need to support keepalive by default and should have no problem with concurrent requests.

Signed-off-by: Aman Gupta <aman@tmm1.net>
This commit is contained in:
Aman Gupta 2017-12-25 20:37:55 -08:00
parent 039007c928
commit 1dd82edea5
2 changed files with 11 additions and 4 deletions
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2
doc/demuxers.texi
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@ -323,7 +323,7 @@ Enabled by default.
@item http_multiple
Use multiple HTTP connections for downloading HTTP segments.
Enabled by default.
Enabled by default for HTTP/1.1 servers.
@end table
@section image2

13
libavformat/hls.c
View File

@ -1452,7 +1452,7 @@ reload:
if (ret)
return ret;
if (c->http_multiple && av_strstart(seg->url, "http", NULL) && v->input_next_requested) {
if (c->http_multiple == 1 && v->input_next_requested) {
FFSWAP(AVIOContext *, v->input, v->input_next);
v->input_next_requested = 0;
ret = 0;
@ -1471,8 +1471,15 @@ reload:
just_opened = 1;
}
if (c->http_multiple == -1) {
uint8_t *http_version_opt = NULL;
av_opt_get(v->input, "http_version", AV_OPT_SEARCH_CHILDREN, &http_version_opt);
c->http_multiple = http_version_opt && strncmp((const char *)http_version_opt, "1.1", 3) == 0;
}
seg = next_segment(v);
if (c->http_multiple && !v->input_next_requested && seg) {
if (c->http_multiple == 1 && !v->input_next_requested &&
seg && av_strstart(seg->url, "http", NULL)) {
ret = open_input(c, v, seg, &v->input_next);
if (ret < 0) {
if (ff_check_interrupt(c->interrupt_callback))
@ -2306,7 +2313,7 @@ static const AVOption hls_options[] = {
{"http_persistent", "Use persistent HTTP connections",
OFFSET(http_persistent), AV_OPT_TYPE_BOOL, {.i64 = 1}, 0, 1, FLAGS },
{"http_multiple", "Use multiple HTTP connections for fetching segments",
OFFSET(http_multiple), AV_OPT_TYPE_BOOL, {.i64 = 1}, 0, 1, FLAGS},
OFFSET(http_multiple), AV_OPT_TYPE_BOOL, {.i64 = -1}, -1, 1, FLAGS},
{NULL}
};