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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