[FFmpeg-devel] [PATCH 1/2] lavc/codec_par: add AVCodecParameters.framerate

[Anton Khirnov <anton@khirnov.net>]

This corresponds to AVCodecContext.framerate.
---
This will be useful in my ffmpeg CLI work, but sending the patches
separately because it's an API addition.
---
 doc/APIchanges         |  3 +++
 libavcodec/codec_par.c |  3 +++
 libavcodec/codec_par.h | 12 ++++++++++++
 libavcodec/version.h   |  2 +-
 4 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/doc/APIchanges b/doc/APIchanges
index 0b609e3d3b..4dbdc5bd01 100644
--- a/doc/APIchanges
+++ b/doc/APIchanges
@@ -2,6 +2,9 @@ The last version increases of all libraries were on 2023-02-09
 
 API changes, most recent first:
 
+2023-05-xx - xxxxxxxxxx - lavc 60.11.100 - codec_par.h
+  Add AVCodecParameters.framerate.
+
 2023-04-10 - xxxxxxxxxx - lavu 58.6.100 - frame.h
   av_frame_get_plane_buffer() now accepts const AVFrame*.
 
diff --git a/libavcodec/codec_par.c b/libavcodec/codec_par.c
index abda649aa8..775c187073 100644
--- a/libavcodec/codec_par.c
+++ b/libavcodec/codec_par.c
@@ -46,6 +46,7 @@ static void codec_parameters_reset(AVCodecParameters *par)
     par->color_space         = AVCOL_SPC_UNSPECIFIED;
     par->chroma_location     = AVCHROMA_LOC_UNSPECIFIED;
     par->sample_aspect_ratio = (AVRational){ 0, 1 };
+    par->framerate           = (AVRational){ 0, 1 };
     par->profile             = FF_PROFILE_UNKNOWN;
     par->level               = FF_LEVEL_UNKNOWN;
 }
@@ -126,6 +127,7 @@ int avcodec_parameters_from_context(AVCodecParameters *par,
         par->chroma_location     = codec->chroma_sample_location;
         par->sample_aspect_ratio = codec->sample_aspect_ratio;
         par->video_delay         = codec->has_b_frames;
+        par->framerate           = codec->framerate;
         break;
     case AVMEDIA_TYPE_AUDIO:
         par->format           = codec->sample_fmt;
@@ -207,6 +209,7 @@ int avcodec_parameters_to_context(AVCodecContext *codec,
         codec->chroma_sample_location = par->chroma_location;
         codec->sample_aspect_ratio    = par->sample_aspect_ratio;
         codec->has_b_frames           = par->video_delay;
+        codec->framerate              = par->framerate;
         break;
     case AVMEDIA_TYPE_AUDIO:
         codec->sample_fmt       = par->format;
diff --git a/libavcodec/codec_par.h b/libavcodec/codec_par.h
index f51d27c590..add90fdb1e 100644
--- a/libavcodec/codec_par.h
+++ b/libavcodec/codec_par.h
@@ -211,6 +211,18 @@ typedef struct AVCodecParameters {
      * Audio only. The channel layout and number of channels.
      */
     AVChannelLayout ch_layout;
+
+    /**
+     * Video only. Number of frames per second, for streams with constant frame
+     * durations. Should be set to { 0, 1 } when some frames have differing
+     * durations or if the value is not known.
+     *
+     * @note This field correponds to values that are stored in codec-level
+     * headers and is typically overridden by container/transport-layer
+     * timestamps, when available. It should thus be used only as a last resort,
+     * when no higher-level timing information is available.
+     */
+    AVRational framerate;
 } AVCodecParameters;
 
 /**
diff --git a/libavcodec/version.h b/libavcodec/version.h
index 80e2ae630d..8b53586be1 100644
--- a/libavcodec/version.h
+++ b/libavcodec/version.h
@@ -29,7 +29,7 @@
 
 #include "version_major.h"
 
-#define LIBAVCODEC_VERSION_MINOR  10
+#define LIBAVCODEC_VERSION_MINOR  11
 #define LIBAVCODEC_VERSION_MICRO 100
 
 #define LIBAVCODEC_VERSION_INT  AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \
-- 
2.39.2

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