[FFmpeg-devel] [PATCH 1/2] avformat/libsrt: support bidirectional transmission

["zhilizhao(赵志立)"]

Ping again.

> On Jun 10, 2021, at 12:13 PM, zhilizhao(赵志立) <quinkblack at foxmail.com> wrote:
> 
> Ping for review, thanks!
> 
>> On May 19, 2021, at 12:03 AM, Zhao Zhili <quinkblack at foxmail.com> wrote:
>> 
>> ---
>> There is no good use case yet. Patch 2/2 is only used for test.
>> 
>> libavformat/libsrt.c | 35 +++++++++++++++++++++++++++--------
>> 1 file changed, 27 insertions(+), 8 deletions(-)
>> 
>> diff --git a/libavformat/libsrt.c b/libavformat/libsrt.c
>> index c1e96f700e..a05921d9f0 100644
>> --- a/libavformat/libsrt.c
>> +++ b/libavformat/libsrt.c
>> @@ -163,10 +163,17 @@ static int libsrt_socket_nonblock(int socket, int enable)
>>    return srt_setsockopt(socket, 0, SRTO_RCVSYN, &blocking, sizeof(blocking));
>> }
>> 
>> -static int libsrt_epoll_create(URLContext *h, int fd, int write)
>> +static int libsrt_epoll_create(URLContext *h, int fd, int flags)
>> {
>> -    int modes = SRT_EPOLL_ERR | (write ? SRT_EPOLL_OUT : SRT_EPOLL_IN);
>> -    int eid = srt_epoll_create();
>> +    int modes;
>> +    int eid;
>> +
>> +    modes = SRT_EPOLL_ERR;
>> +    if (flags & AVIO_FLAG_WRITE)
>> +        modes |= SRT_EPOLL_OUT;
>> +    if (flags & AVIO_FLAG_READ)
>> +        modes |= SRT_EPOLL_IN;
>> +    eid = srt_epoll_create();
>>    if (eid < 0)
>>        return libsrt_neterrno(h);
>>    if (srt_epoll_add_usock(eid, fd, &modes) < 0) {
>> @@ -178,14 +185,26 @@ static int libsrt_epoll_create(URLContext *h, int fd, int write)
>> 
>> static int libsrt_network_wait_fd(URLContext *h, int eid, int write)
>> {
>> -    int ret, len = 1, errlen = 1;
>> +    int ret, len = 1, errlen;
>>    SRTSOCKET ready[1];
>>    SRTSOCKET error[1];
>> +    SRTSOCKET *error_ptr;
>> +    int *errlen_ptr;
>> +    if ((h->flags & AVIO_FLAG_READ_WRITE) == AVIO_FLAG_READ_WRITE) {
>> +        // cannot detect error in this case
>> +        errlen = 0;
>> +        error_ptr = NULL;
>> +        errlen_ptr = NULL;
>> +    } else {
>> +        errlen = 1;
>> +        error_ptr = error;
>> +        errlen_ptr = &errlen;
>> +    }
>> 
>>    if (write) {
>> -        ret = srt_epoll_wait(eid, error, &errlen, ready, &len, POLLING_TIME, 0, 0, 0, 0);
>> +        ret = srt_epoll_wait(eid, error_ptr, errlen_ptr, ready, &len, POLLING_TIME, 0, 0, 0, 0);
>>    } else {
>> -        ret = srt_epoll_wait(eid, ready, &len, error, &errlen, POLLING_TIME, 0, 0, 0, 0);
>> +        ret = srt_epoll_wait(eid, ready, &len, error_ptr, errlen_ptr, POLLING_TIME, 0, 0, 0, 0);
>>    }
>>    if (ret < 0) {
>>        if (srt_getlasterror(NULL) == SRT_ETIMEOUT)
>> @@ -435,7 +454,7 @@ static int libsrt_setup(URLContext *h, const char *uri, int flags)
>>    if (libsrt_socket_nonblock(fd, 1) < 0)
>>        av_log(h, AV_LOG_DEBUG, "libsrt_socket_nonblock failed\n");
>> 
>> -    ret = write_eid = libsrt_epoll_create(h, fd, 1);
>> +    ret = write_eid = libsrt_epoll_create(h, fd, AVIO_FLAG_WRITE);
>>    if (ret < 0)
>>        goto fail1;
>>    if (s->mode == SRT_MODE_LISTENER) {
>> @@ -479,7 +498,7 @@ static int libsrt_setup(URLContext *h, const char *uri, int flags)
>>            h->max_packet_size = packet_size;
>>    }
>> 
>> -    ret = eid = libsrt_epoll_create(h, fd, flags & AVIO_FLAG_WRITE);
>> +    ret = eid = libsrt_epoll_create(h, fd, flags);
>>    if (eid < 0)
>>        goto fail1;
>> 
>> -- 
>> 2.25.1
>> 
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> 
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