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

[Wang Chuan <ouchuanm@outlook.com>]

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.

On 2022/1/14 11:21, "zhilizhao(赵志立)" wrote:
>
>> On Jan 14, 2022, at 10:42 AM, Wang Chuan <ouchuanm@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@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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