[FFmpeg-devel] [PATCH] avformat/aviobuf: let avio_read can retry when timeout

["zhilizhao(赵志立)"]

> On Jan 14, 2022, at 12:50 PM, Wang Chuan <ouchuanm at outlook.com> wrote:
> 
> I just try to use avio to read stream by http protocol.
> 
> But if the server responds too late, avio_read will return timeout, and the only way I can do is close it and reopen.
> 
> Of course I can set a large timeout, but it's hard to decide which timeout value is large enough.

Then don’t set it, use the default infinite value.

> 
> On 2022/1/14 11:21, "zhilizhao(赵志立)" wrote:
>> 
>>> On Jan 14, 2022, at 10:42 AM, Wang Chuan <ouchuanm at outlook.com> wrote:
>>> 
>>> If we meet timeout when reading network resource, avio_read will set
>>> [eof_reached] to 1. And this prevent caller to retry since avio_read
>>> do nothing and just return if eof_reached == 1.
>> If timeout was triggered by a small ‘timeout’ setting from user, just
>> change the ‘timeout' configuration. If it was triggered by a system call,
>> it’s likely to be in a state of not recoverable. Could you share more
>> details about the issue this patch trying to solve?
>> 
>>> Signed-off-by: Wang Chuan <ouchuanm at outlook.com>
>>> ---
>>> libavformat/aviobuf.c | 5 +++--
>>> 1 file changed, 3 insertions(+), 2 deletions(-)
>>> 
>>> diff --git a/libavformat/aviobuf.c b/libavformat/aviobuf.c
>>> index 29d4bd7510..38cb21debf 100644
>>> --- a/libavformat/aviobuf.c
>>> +++ b/libavformat/aviobuf.c
>>> @@ -580,8 +580,9 @@ static void fill_buffer(AVIOContext *s)
>>>            be done without rereading data */
>>>         s->eof_reached = 1;
>>>     } else if (len < 0) {
>>> -        s->eof_reached = 1;
>>> -        s->error= len;
>>> +        s->error = len;
>>> +        if (s->error != AVERROR(ETIMEDOUT))
>>> +            s->eof_reached = 1;
>>>     } else {
>>>         s->pos += len;
>>>         s->buf_ptr = dst;
>>> -- 
>>> 2.29.2
>>> 
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