avformat/utils: make ff_ntp_time() accept a timestamp as input argument

Will be needed by the next patch.
Signed-off-by: James Almer <jamrial@gmail.com>

libavformat/internal.h

@@ -243,7 +243,7 @@ void ff_read_frame_flush(AVFormatContext *s);
 #define NTP_OFFSET_US (NTP_OFFSET * 1000000ULL)
 
 /** Get the current time since NTP epoch in microseconds. */
-uint64_t ff_ntp_time(void);
+uint64_t ff_ntp_time(int64_t timestamp);
 
 /**
  * Get the NTP time stamp formatted as per the RFC-5905.

libavformat/movenc.c

@@ -4648,7 +4648,7 @@ static int mov_write_prft_tag(AVIOContext *pb, MOVMuxContext *mov, int tracks)
     }
 
     if (mov->write_prft == MOV_PRFT_SRC_WALLCLOCK) {
-        ntp_ts = ff_get_formatted_ntp_time(ff_ntp_time());
+        ntp_ts = ff_get_formatted_ntp_time(ff_ntp_time(av_gettime()));
     } else if (mov->write_prft == MOV_PRFT_SRC_PTS) {
         pts_us = av_rescale_q(first_track->cluster[0].pts,
                               first_track->st->time_base, AV_TIME_BASE_Q);

libavformat/rtpenc.c

@@ -124,7 +124,7 @@ static int rtp_write_header(AVFormatContext *s1)
     if (!s->ssrc)
         s->ssrc = av_get_random_seed();
     s->first_packet = 1;
-    s->first_rtcp_ntp_time = ff_ntp_time();
+    s->first_rtcp_ntp_time = ff_ntp_time(av_gettime());
     if (s1->start_time_realtime != 0  &&  s1->start_time_realtime != AV_NOPTS_VALUE)
         /* Round the NTP time to whole milliseconds. */
         s->first_rtcp_ntp_time = (s1->start_time_realtime / 1000) * 1000 +
@@ -526,9 +526,9 @@ static int rtp_write_packet(AVFormatContext *s1, AVPacket *pkt)
     rtcp_bytes = ((s->octet_count - s->last_octet_count) * RTCP_TX_RATIO_NUM) /
         RTCP_TX_RATIO_DEN;
     if ((s->first_packet || ((rtcp_bytes >= RTCP_SR_SIZE) &&
-                            (ff_ntp_time() - s->last_rtcp_ntp_time > 5000000))) &&
+                            (ff_ntp_time(av_gettime()) - s->last_rtcp_ntp_time > 5000000))) &&
         !(s->flags & FF_RTP_FLAG_SKIP_RTCP)) {
-        rtcp_send_sr(s1, ff_ntp_time(), 0);
+        rtcp_send_sr(s1, ff_ntp_time(av_gettime()), 0);
         s->last_octet_count = s->octet_count;
         s->first_packet = 0;
     }
@@ -642,7 +642,7 @@ static int rtp_write_trailer(AVFormatContext *s1)
     /* If the caller closes and recreates ->pb, this might actually
      * be NULL here even if it was successfully allocated at the start. */
     if (s1->pb && (s->flags & FF_RTP_FLAG_SEND_BYE))
-        rtcp_send_sr(s1, ff_ntp_time(), 1);
+        rtcp_send_sr(s1, ff_ntp_time(av_gettime()), 1);
     av_freep(&s->buf);
 
     return 0;

libavformat/rtpenc.h

@@ -21,6 +21,7 @@
 #ifndef AVFORMAT_RTPENC_H
 #define AVFORMAT_RTPENC_H
 
+#include "libavutil/time.h"
 #include "avformat.h"
 #include "rtp.h"
 

libavformat/utils.c

@@ -4684,9 +4684,9 @@ void av_program_add_stream_index(AVFormatContext *ac, int progid, unsigned idx)
     }
 }
 
-uint64_t ff_ntp_time(void)
+uint64_t ff_ntp_time(int64_t timestamp)
 {
-    return (av_gettime() / 1000) * 1000 + NTP_OFFSET_US;
+    return (timestamp / 1000) * 1000 + NTP_OFFSET_US;
 }
 
 uint64_t ff_get_formatted_ntp_time(uint64_t ntp_time_us)