[FFmpeg-devel] [PATCH 08/18] avformat/tls: move openssl specific init out of generic code

[Jack Lau]

> On Jul 3, 2025, at 22:24, Timo Rothenpieler <timo at rothenpieler.org> wrote:
> 
> On 03.07.2025 03:07, Jack Lau wrote:
>>> On Jul 3, 2025, at 00:56, Timo Rothenpieler <timo at rothenpieler.org> wrote:
>>> 
>>> ---
>>> libavformat/tls.c         | 9 ---------
>>> libavformat/tls_openssl.c | 3 +++
>>> 2 files changed, 3 insertions(+), 9 deletions(-)
>>> 
>>> diff --git a/libavformat/tls.c b/libavformat/tls.c
>>> index 5ec4cca58a..f888970969 100644
>>> --- a/libavformat/tls.c
>>> +++ b/libavformat/tls.c
>>> @@ -135,15 +135,6 @@ int ff_tls_open_underlying(TLSShared *c, URLContext *parent, const char *uri, AV
>>>     ret = ffurl_open_whitelist(c->is_dtls ? &c->udp : &c->tcp, buf, AVIO_FLAG_READ_WRITE,
>>>                                &parent->interrupt_callback, options,
>>>                                parent->protocol_whitelist, parent->protocol_blacklist, parent);
>>> -    if (c->is_dtls) {
>>> -        if (ret < 0) {
>>> -            av_log(c, AV_LOG_ERROR, "Failed to open udp://%s:%d\n", c->underlying_host, port);
>>> -            return ret;
>>> -        }
>>> -        /* Make the socket non-blocking, set to READ and WRITE mode after connected */
>>> -        ff_socket_nonblock(ffurl_get_file_handle(c->udp), 1);
>>> -        c->udp->flags |= AVIO_FLAG_READ | AVIO_FLAG_NONBLOCK;
>>> -    }
>>>     return ret;
>>> }
>>> 
>>> diff --git a/libavformat/tls_openssl.c b/libavformat/tls_openssl.c
>>> index 2a3905891d..d83fe602d5 100644
>>> --- a/libavformat/tls_openssl.c
>>> +++ b/libavformat/tls_openssl.c
>>> @@ -985,6 +985,9 @@ static int dtls_start(URLContext *h, const char *url, int flags, AVDictionary **
>>>             av_log(p, AV_LOG_ERROR, "Failed to connect %s\n", url);
>>>             return ret;
>>>         }
>>> +        /* Make the socket non-blocking, set to READ and WRITE mode after connected */
>>> +        ff_socket_nonblock(ffurl_get_file_handle(p->tls_shared.udp), 1);
>>> +        p->tls_shared.udp->flags |= AVIO_FLAG_READ | AVIO_FLAG_NONBLOCK;
>> Since AVIO_FLAG_READ_WRITE was flagged, it can be just "p->tls_shared.udp->flags |= AVIO_FLAG_NONBLOCK;”
> 
> Isn't that redundant with ff_socket_nonblock right above it as well?
No, I think we need keep them all.

The first line ff_socket_nonblock tells the system nonblock
The second line NONBLOCK flag tells ffmpeg to skip ff_network_wait_fd (can see that in udp_read or udp_write)

I’m not very sure if I explained it right, but when I remove one line of them, the streaming is so choppy and it is almost unusable.
> 
>>>     }
>>> 
>>>     /* Setup DTLS as passive, which is server role. */
>>> -- 
>>> 2.49.0
>>> 
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>> Thanks
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> 
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