[FFmpeg-devel] [PATCH] lavc/av1*: fix exporting framerate

[Anton Khirnov]

* take num_ticks_per_picture_minus_1 into account, since that is a part
  of the framerate computation
* stop exporting num_ticks_per_picture_minus_1 into
  AVCodecContext.ticks_per_frame, as that field is used for other
  purposes (in conjunction with repeat_pict, which is not used at all by
  av1)
---
 libavcodec/Makefile     |  2 +-
 libavcodec/av1_parse.c  | 14 ++++++++++++++
 libavcodec/av1_parse.h  |  3 +++
 libavcodec/av1_parser.c | 11 ++++++-----
 libavcodec/av1dec.c     | 14 +++++---------
 5 files changed, 29 insertions(+), 15 deletions(-)

diff --git a/libavcodec/Makefile b/libavcodec/Makefile
index 3cf4444b7e..9587e56493 100644
--- a/libavcodec/Makefile
+++ b/libavcodec/Makefile
@@ -1143,7 +1143,7 @@ OBJS-$(CONFIG_AC3_PARSER)              += aac_ac3_parser.o ac3tab.o \
                                           ac3_channel_layout_tab.o
 OBJS-$(CONFIG_ADX_PARSER)              += adx_parser.o
 OBJS-$(CONFIG_AMR_PARSER)              += amr_parser.o
-OBJS-$(CONFIG_AV1_PARSER)              += av1_parser.o
+OBJS-$(CONFIG_AV1_PARSER)              += av1_parser.o av1_parse.o
 OBJS-$(CONFIG_AVS2_PARSER)             += avs2.o avs2_parser.o
 OBJS-$(CONFIG_AVS3_PARSER)             += avs3_parser.o
 OBJS-$(CONFIG_BMP_PARSER)              += bmp_parser.o
diff --git a/libavcodec/av1_parse.c b/libavcodec/av1_parse.c
index 59ea0bc6e7..136ad1a58f 100644
--- a/libavcodec/av1_parse.c
+++ b/libavcodec/av1_parse.c
@@ -108,3 +108,17 @@ void ff_av1_packet_uninit(AV1Packet *pkt)
     av_freep(&pkt->obus);
     pkt->obus_allocated = pkt->obus_allocated_size = 0;
 }
+
+AVRational ff_av1_framerate(int64_t ticks_per_frame, int64_t units_per_tick,
+                            int64_t time_scale)
+{
+    AVRational fr;
+
+    if (ticks_per_frame && units_per_tick && time_scale &&
+        ticks_per_frame < INT64_MAX / units_per_tick    &&
+        av_reduce(&fr.den, &fr.num, units_per_tick * ticks_per_frame,
+                  time_scale, INT_MAX))
+        return fr;
+
+    return (AVRational){ 0, 1 };
+}
diff --git a/libavcodec/av1_parse.h b/libavcodec/av1_parse.h
index f4a5d2830e..1f3001d2a5 100644
--- a/libavcodec/av1_parse.h
+++ b/libavcodec/av1_parse.h
@@ -181,4 +181,7 @@ static inline int get_obu_bit_length(const uint8_t *buf, int size, int type)
     return size;
 }
 
+AVRational ff_av1_framerate(int64_t ticks_per_frame, int64_t units_per_tick,
+                            int64_t time_scale);
+
 #endif /* AVCODEC_AV1_PARSE_H */
diff --git a/libavcodec/av1_parser.c b/libavcodec/av1_parser.c
index 14dae92fe9..2b79493bf8 100644
--- a/libavcodec/av1_parser.c
+++ b/libavcodec/av1_parser.c
@@ -21,6 +21,8 @@
  */
 
 #include "libavutil/avassert.h"
+
+#include "av1_parse.h"
 #include "cbs.h"
 #include "cbs_av1.h"
 #include "parser.h"
@@ -162,11 +164,10 @@ static int av1_parser_parse(AVCodecParserContext *ctx,
     avctx->color_trc = (enum AVColorTransferCharacteristic) color->transfer_characteristics;
     avctx->color_range = color->color_range ? AVCOL_RANGE_JPEG : AVCOL_RANGE_MPEG;
 
-    if (seq->timing_info_present_flag) {
-        const AV1RawTimingInfo *timing = &seq->timing_info;
-        av_reduce(&avctx->framerate.den, &avctx->framerate.num,
-                  timing->num_units_in_display_tick, timing->time_scale, INT_MAX);
-    }
+    if (seq->timing_info_present_flag)
+        avctx->framerate = ff_av1_framerate(1LL + seq->timing_info.num_ticks_per_picture_minus_1,
+                                            seq->timing_info.num_units_in_display_tick,
+                                            seq->timing_info.time_scale);
 
 end:
     ff_cbs_fragment_reset(td);
diff --git a/libavcodec/av1dec.c b/libavcodec/av1dec.c
index c90c9c1a69..d46ee48335 100644
--- a/libavcodec/av1dec.c
+++ b/libavcodec/av1dec.c
@@ -26,6 +26,7 @@
 #include "libavutil/pixdesc.h"
 #include "libavutil/opt.h"
 #include "avcodec.h"
+#include "av1_parse.h"
 #include "av1dec.h"
 #include "atsc_a53.h"
 #include "bytestream.h"
@@ -709,15 +710,10 @@ static int set_context_with_sequence(AVCodecContext *avctx,
     }
     avctx->sample_aspect_ratio = (AVRational) { 1, 1 };
 
-    if (seq->timing_info.num_units_in_display_tick &&
-        seq->timing_info.time_scale) {
-        av_reduce(&avctx->framerate.den, &avctx->framerate.num,
-                  seq->timing_info.num_units_in_display_tick,
-                  seq->timing_info.time_scale,
-                  INT_MAX);
-        if (seq->timing_info.equal_picture_interval)
-            avctx->ticks_per_frame = seq->timing_info.num_ticks_per_picture_minus_1 + 1;
-    }
+    if (seq->timing_info_present_flag)
+        avctx->framerate = ff_av1_framerate(1LL + seq->timing_info.num_ticks_per_picture_minus_1,
+                                            seq->timing_info.num_units_in_display_tick,
+                                            seq->timing_info.time_scale);
 
     return 0;
 }
-- 
2.39.2