lavc: add pkt_timebase to allow avcodec to adjust pkt_dts/pts when needed

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

libavcodec/avcodec.h

@@ -2946,6 +2946,15 @@ typedef struct AVCodecContext {
      */
     uint64_t vbv_delay;
 
+    /**
+     * Timebase in which pkt_dts/pts and AVPacket.dts/pts are.
+     * Code outside libavcodec should access this field using:
+     * avcodec_set_pkt_timebase(avctx)
+     * - encoding unused.
+     * - decodimg set by user
+     */
+    AVRational pkt_timebase;
+
     /**
      * Current statistics for PTS correction.
      * - decoding: maintained and used by libavcodec, not intended to be used by user apps
@@ -2957,6 +2966,9 @@ typedef struct AVCodecContext {
     int64_t pts_correction_last_dts;       /// DTS of the last frame
 } AVCodecContext;
 
+AVRational av_codec_get_pkt_timebase         (const AVCodecContext *avctx);
+void       av_codec_set_pkt_timebase         (AVCodecContext *avctx, AVRational val);
+
 /**
  * AVProfile.
  */

libavcodec/options_table.h

@@ -409,6 +409,7 @@ static const AVOption options[]={
 {"s32p", "32-bit signed integer planar",  0, AV_OPT_TYPE_CONST, {.dbl = AV_SAMPLE_FMT_S32P }, INT_MIN, INT_MAX, A|D, "request_sample_fmt"},
 {"fltp", "32-bit float planar",           0, AV_OPT_TYPE_CONST, {.dbl = AV_SAMPLE_FMT_FLTP }, INT_MIN, INT_MAX, A|D, "request_sample_fmt"},
 {"dblp", "64-bit double planar",          0, AV_OPT_TYPE_CONST, {.dbl = AV_SAMPLE_FMT_DBLP }, INT_MIN, INT_MAX, A|D, "request_sample_fmt"},
+{"pkt_timebase", NULL, OFFSET(pkt_timebase), AV_OPT_TYPE_RATIONAL, {.dbl = 0 }, 0, INT_MAX, 0},
 {NULL},
 };
 

libavcodec/utils.c

@@ -726,6 +726,8 @@ MAKE_ACCESSORS(AVFrame, frame, int64_t, pkt_pos)
 MAKE_ACCESSORS(AVFrame, frame, int64_t, channel_layout)
 MAKE_ACCESSORS(AVFrame, frame, int,     sample_rate)
 
+MAKE_ACCESSORS(AVCodecContext, codec, AVRational, pkt_timebase)
+
 static void avcodec_get_subtitle_defaults(AVSubtitle *sub)
 {
     memset(sub, 0, sizeof(*sub));

libavcodec/version.h

@@ -27,7 +27,7 @@
  */
 
 #define LIBAVCODEC_VERSION_MAJOR 54
-#define LIBAVCODEC_VERSION_MINOR  35
+#define LIBAVCODEC_VERSION_MINOR  36
 #define LIBAVCODEC_VERSION_MICRO 100
 
 #define LIBAVCODEC_VERSION_INT  AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \