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rtpenc: Expose the max packet size via an avoption

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This allows opting for a lower MTU than what the AVIOContext
indicated, and allows writing into outputs that don't indicate
an MTU at all (such as plain files, which is useful for testing).

This also allows querying for the MTU via the avoption.

Signed-off-by: Martin Storsjö <martin@martin.st>
This commit is contained in:
Martin Storsjö 2012-02-23 11:56:15 +02:00
parent f553462041
commit ba605cef79
1 changed files with 7 additions and 1 deletions
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8
libavformat/rtpenc.c
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@ -33,6 +33,7 @@
static const AVOption options[] = {
FF_RTP_FLAG_OPTS(RTPMuxContext, flags)
{ "payload_type", "Specify RTP payload type", offsetof(RTPMuxContext, payload_type), AV_OPT_TYPE_INT, {.dbl = -1 }, -1, 127, AV_OPT_FLAG_ENCODING_PARAM },
{ "max_packet_size", "Max packet size", offsetof(RTPMuxContext, max_packet_size), AV_OPT_TYPE_INT, {.dbl = 0 }, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM },
{ NULL },
};
@ -109,7 +110,12 @@ static int rtp_write_header(AVFormatContext *s1)
s->first_rtcp_ntp_time = (s1->start_time_realtime / 1000) * 1000 +
NTP_OFFSET_US;
s->max_packet_size = s1->pb->max_packet_size;
if (s->max_packet_size) {
if (s1->pb->max_packet_size)
s->max_packet_size = FFMIN(s->max_payload_size,
s1->pb->max_packet_size);
} else
s->max_packet_size = s1->pb->max_packet_size;
if (s->max_packet_size <= 12) {
av_log(s1, AV_LOG_ERROR, "Max packet size %d too low\n", s->max_packet_size);
return AVERROR(EIO);