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Support broadcast destination for udp protocol

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Use the required socket option SO_BROADCAST to be able to stream to a broadcast
address.

Prior to the patch, trying to stream to a broadcast address was resulting to the
following error:

av_interleaved_write_frame(): Permission denied

The patch has been tested with:

ffmpeg -f v4l2 -framerate 30 -input_format yuyv422 -video_size 640x480 -i /dev/video0 \
 -c:v libx264 -profile:v high -preset ultrafast -tune zerolatency -b:v 500k -pix_fmt yuv420p \
 -f mpegts udp://192.168.1.255:5004?broadcast=1

I have added an option to let the user explicitly request broadcast in order to avoid
ffmpeg to broadcast unintentionally.

Signed-off-by: Olivier Langlois <olivier@trillion01.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Olivier Langlois 2014-04-08 23:21:52 -04:00 committed by Michael Niedermayer
parent bb9e5116fe
commit f1c167496e
1 changed files with 9 additions and 0 deletions
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9
libavformat/udp.c
View File

@ -62,6 +62,7 @@ typedef struct {
int ttl;
int buffer_size;
int is_multicast;
int is_broadcast;
int local_port;
int reuse_socket;
int overrun_nonfatal;
@ -96,6 +97,7 @@ static const AVOption options[] = {
{"localaddr", "choose local IP address", OFFSET(local_addr), AV_OPT_TYPE_STRING, {.str = ""}, 0, 0, D|E },
{"pkt_size", "set size of UDP packets", OFFSET(packet_size), AV_OPT_TYPE_INT, {.i64 = 1472}, 0, INT_MAX, D|E },
{"reuse", "explicitly allow or disallow reusing UDP sockets", OFFSET(reuse_socket), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, D|E },
{"broadcast", "explicitly allow or disallow broadcast destination", OFFSET(is_broadcast), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, E },
{"ttl", "set the time to live value (for multicast only)", OFFSET(ttl), AV_OPT_TYPE_INT, {.i64 = 16}, 0, INT_MAX, E },
{"connect", "set if connect() should be called on socket", OFFSET(is_connected), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, D|E },
/* TODO 'sources', 'block' option */
@ -602,6 +604,8 @@ static int udp_open(URLContext *h, const char *uri, int flags)
}
if (!is_output && av_find_info_tag(buf, sizeof(buf), "timeout", p))
s->timeout = strtol(buf, NULL, 10);
if (is_output && av_find_info_tag(buf, sizeof(buf), "broadcast", p))
s->is_broadcast = strtol(buf, NULL, 10);
}
/* handling needed to support options picking from both AVOption and URL */
s->circular_buffer_size *= 188;
@ -642,6 +646,11 @@ static int udp_open(URLContext *h, const char *uri, int flags)
goto fail;
}
if (s->is_broadcast) {
if (setsockopt (udp_fd, SOL_SOCKET, SO_BROADCAST, &(s->is_broadcast), sizeof(s->is_broadcast)) != 0)
goto fail;
}
/* If multicast, try binding the multicast address first, to avoid
* receiving UDP packets from other sources aimed at the same UDP
* port. This fails on windows. This makes sending to the same address