lavf: Add support offset timestamps on muxing.

This allows avoiding negative timestamps.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

1 files changed, 18 insertions, 0 deletions

diff --git a/libavformat/avformat.h b/libavformat/avformat.h
index 166fdbb228..de53c26ee5 100644
--- a/libavformat/avformat.h
+++ b/libavformat/avformat.h
@@ -832,6 +832,13 @@ typedef struct AVStream {
      * its lifetime differs from info which is why its not in that structure.
      */
     int nb_decoded_frames;
+
+    /**
+     * Timestamp offset added to timestamps before muxing
+     * NOT PART OF PUBLIC API
+     */
+    int64_t mux_ts_offset;
+
 } AVStream;
 
 #define AV_PROGRAM_RUNNING 1
@@ -1111,6 +1118,17 @@ typedef struct AVFormatContext {
      */
     int use_wallclock_as_timestamps;
 
+    /**
+     * Avoids negative timestamps during muxing
+     *  0 -> allow negative timestamps
+     *  1 -> avoid negative timestamps
+     * -1 -> choose automatically (default)
+     * Note, this is only works when interleave_packet_per_dts is in use
+     * - encoding: Set by user via AVOptions (NO direct access)
+     * - decoding: unused
+     */
+    int avoid_negative_ts;
+
     /*****************************************************************
      * All fields below this line are not part of the public API. They
      * may not be used outside of libavformat and can be changed and