From c8bc8ef4a4600f80250b27027a0029212cf1ac09 Mon Sep 17 00:00:00 2001
From: maggievu-pdftron <91563619+maggievu-pdftron@users.noreply.github.com>
Date: Mon, 13 Dec 2021 17:47:25 -0800
Subject: [PATCH] add FPS information (#12)

---
 src/ffprobe-wasm-wrapper.cpp  | 4 ++++
 www/src/components/Frames.vue | 1 +
 2 files changed, 5 insertions(+)

diff --git a/src/ffprobe-wasm-wrapper.cpp b/src/ffprobe-wasm-wrapper.cpp
index 315b899..d8fc1a2 100644
--- a/src/ffprobe-wasm-wrapper.cpp
+++ b/src/ffprobe-wasm-wrapper.cpp
@@ -68,6 +68,7 @@ typedef struct FramesResponse {
   int gop_size;
   int duration;
   double time_base;
+  double avg_frame_rate;
 } FramesResponse;
 
 FileInfoResponse get_file_info(std::string filename) {
@@ -195,11 +196,13 @@ FramesResponse get_frames(std::string filename, int timestamp) {
     }
 
     AVRational stream_time_base = pFormatContext->streams[video_stream_index]->time_base;
+    AVRational avg_frame_rate = pFormatContext->streams[video_stream_index]->avg_frame_rate;
     // printf("stream_time_base: %d / %d = %.5f\n", stream_time_base.num, stream_time_base.den, av_q2d(stream_time_base));
 
     FramesResponse r;
     r.nb_frames = nb_frames;
     r.time_base = av_q2d(stream_time_base);
+    r.avg_frame_rate = av_q2d(avg_frame_rate);
     r.duration = pFormatContext->streams[video_stream_index]->duration;
 
     // If the duration value isn't in the stream, get from the FormatContext.
@@ -316,6 +319,7 @@ EMSCRIPTEN_BINDINGS(structs) {
   .field("gop_size", &FramesResponse::gop_size)
   .field("duration", &FramesResponse::duration)
   .field("time_base", &FramesResponse::time_base)
+  .field("avg_frame_rate", &FramesResponse::avg_frame_rate)
   ;
   function("get_frames", &get_frames);
 }
\ No newline at end of file
diff --git a/www/src/components/Frames.vue b/www/src/components/Frames.vue
index e0c9129..31783a0 100644
--- a/www/src/components/Frames.vue
+++ b/www/src/components/Frames.vue
@@ -54,6 +54,7 @@ export default {
         { name: 'Duration', value: this.data.duration },
         { name: 'Timebase', value: this.data.time_base },
         { name: 'Total Frames', value: this.data.nb_frames },
+        { name: 'FPS', value: this.data.avg_frame_rate },
       ]
     }
   },