From f121dbd9f76031d7f6d56261be2f14937a19d2dd Mon Sep 17 00:00:00 2001
From: Luca Barbato <lu_zero@gentoo.org>
Date: Fri, 6 Jun 2014 15:59:25 +0200
Subject: [PATCH] mpegts: Provide an option to override the pcr period
Certain hardware demuxer have specific restrictions for PCR periodicity.
---
doc/muxers.texi | 3 +++
libavformat/mpegtsenc.c | 5 ++++-
2 files changed, 7 insertions(+), 1 deletion(-)
diff --git a/doc/muxers.texi b/doc/muxers.texi
index 12d56efcd06..325bb9dbdb8 100644
--- a/doc/muxers.texi
+++ b/doc/muxers.texi
@@ -405,6 +405,9 @@ Set the first PID for PMT (default 0x1000, max 0x1f00).
Set the first PID for data packets (default 0x0100, max 0x0f00).
@item -muxrate @var{number}
Set a constant muxrate (default VBR).
+@item -pcr_period @var{numer}
+Override the default PCR retransmission time (default 20ms), ignored
+if variable muxrate is selected.
@end table
The recognized metadata settings in mpegts muxer are @code{service_provider}
diff --git a/libavformat/mpegtsenc.c b/libavformat/mpegtsenc.c
index 58a09fc60ed..04cabe5f8d9 100644
--- a/libavformat/mpegtsenc.c
+++ b/libavformat/mpegtsenc.c
@@ -79,6 +79,7 @@ typedef struct MpegTSWrite {
int reemit_pat_pmt; // backward compatibility
+ int pcr_period;
#define MPEGTS_FLAG_REEMIT_PAT_PMT 0x01
#define MPEGTS_FLAG_AAC_LATM 0x02
int flags;
@@ -559,7 +560,7 @@ static int mpegts_write_header(AVFormatContext *s)
}
if (ts->mux_rate > 1) {
- service->pcr_packet_period = (ts->mux_rate * PCR_RETRANS_TIME) /
+ service->pcr_packet_period = (ts->mux_rate * ts->pcr_period) /
(TS_PACKET_SIZE * 8 * 1000);
ts->sdt_packet_period = (ts->mux_rate * SDT_RETRANS_TIME) /
(TS_PACKET_SIZE * 8 * 1000);
@@ -1154,6 +1155,8 @@ static const AVOption options[] = {
// backward compatibility
{ "resend_headers", "Reemit PAT/PMT before writing the next packet",
offsetof(MpegTSWrite, reemit_pat_pmt), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM},
+ { "pcr_period", "PCR retransmission time",
+ offsetof(MpegTSWrite, pcr_period), AV_OPT_TYPE_INT, { .i64 = PCR_RETRANS_TIME }, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM },
{ NULL },
};
--
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