On 2022-06-16 02:39 pm, Gyan Doshi wrote:
Stores wallclock time for the first packet received with a pts.

Comments?
---
  doc/APIchanges         |  3 +++
  libavformat/avformat.h | 10 ++++++++++
  libavformat/demux.c    |  3 +++
  libavformat/options.c  |  1 +
  libavformat/version.h  |  2 +-
  5 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/doc/APIchanges b/doc/APIchanges
index 5857e67ae6..3d472b8963 100644
--- a/doc/APIchanges
+++ b/doc/APIchanges
@@ -14,6 +14,9 @@ libavutil:     2021-04-27
API changes, most recent first: +2022-06-xx - xxxxxxxxxx - lavf 59.26.100 - avformat.h
+  Add and set AVFormatContext.first_pts_wallclock field.
+
  2022-06-12 - xxxxxxxxxx - lavf 59.25.100 - avio.h
    Add avio_vprintf(), similar to avio_printf() but allow to use it
    from within a function taking a variable argument list as input.
diff --git a/libavformat/avformat.h b/libavformat/avformat.h
index f12fa7d904..56f9656a68 100644
--- a/libavformat/avformat.h
+++ b/libavformat/avformat.h
@@ -1808,6 +1808,16 @@ typedef struct AVFormatContext {
       */
      int max_probe_packets;
+ /**
+     * Wallclock start time of the stream in real world time, in microseconds
+     * since the Unix epoch (00:00 1st January 1970). That is, the first packet
+     * with a set pts was received at this real world time.
+     * - demuxing: Set by libavformat. Users may want to use 
start_time_realtime
+     *             if set.
+     * - muxing: unused.
+     */
+    int64_t first_pts_wallclock;
+
      /**
       * A callback for closing the streams opened with 
AVFormatContext.io_open().
       *
diff --git a/libavformat/demux.c b/libavformat/demux.c
index 1620716716..9335a6efcd 100644
--- a/libavformat/demux.c
+++ b/libavformat/demux.c
@@ -628,6 +628,9 @@ FF_ENABLE_DEPRECATION_WARNINGS
force_codec_ids(s, st); + if (s->first_pts_wallclock == AV_NOPTS_VALUE && pkt->pts != AV_NOPTS_VALUE)
+            s->first_pts_wallclock = av_gettime();
+
          /* TODO: audio: time filter; video: frame reordering (pts != dts) */
          if (s->use_wallclock_as_timestamps)
              pkt->dts = pkt->pts = av_rescale_q(av_gettime(), AV_TIME_BASE_Q, 
st->time_base);
diff --git a/libavformat/options.c b/libavformat/options.c
index 0079a06d9a..4cc168939f 100644
--- a/libavformat/options.c
+++ b/libavformat/options.c
@@ -184,6 +184,7 @@ AVFormatContext *avformat_alloc_context(void)
          return NULL;
      }
+ s->first_pts_wallclock = AV_NOPTS_VALUE;
      si->shortest_end = AV_NOPTS_VALUE;
return s;
diff --git a/libavformat/version.h b/libavformat/version.h
index 966ebb7ed3..0708d619c0 100644
--- a/libavformat/version.h
+++ b/libavformat/version.h
@@ -31,7 +31,7 @@
#include "version_major.h" -#define LIBAVFORMAT_VERSION_MINOR 25
+#define LIBAVFORMAT_VERSION_MINOR  26
  #define LIBAVFORMAT_VERSION_MICRO 100
#define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \

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