From 4130e6fc6c38e89a6555b60d9bef63d64840b3c9 Mon Sep 17 00:00:00 2001
From: Peng Li <seudut@gmail.com>
Date: Thu, 31 May 2018 20:13:10 +0800
Subject: [PATCH] Fix some key event issue

---
 yuvPlayer.cpp | 59 +++++++++++++++++++++++++++++++++++++++++++++++------------
 1 file changed, 47 insertions(+), 12 deletions(-)

diff --git a/yuvPlayer.cpp b/yuvPlayer.cpp
index 322975e..fbd4536 100644
--- a/yuvPlayer.cpp
+++ b/yuvPlayer.cpp
@@ -1,5 +1,8 @@
 #include<iostream>
 #include<fstream>
+#include<thread>
+#include<sstream>
+#include<iomanip>
 #include "SDL2/SDL.h"
 
 using namespace std;
@@ -11,13 +14,18 @@ using namespace std;
  * Play YUV with ffplay
  * ffplay -f rawvideo -pixel_format yuv420p -video_size 1280x720 -i ./out.yuv
  *
+ * Usage:
+ *      1. press 'P' to pause or play as the given framerate
+ *      2. press 'q' to quit
+ *      3. press RIGHT to next frame, LEFT to previous frame
+ *      4. color space transform
  */
 
 class YuvPlayer 
 {
 public:
-    YuvPlayer(int width, int height);
-    void play(string fname);
+    YuvPlayer(int width, int height, const string& title = "YUV Player");
+    void play(string fname, int fps = -1);
     ~YuvPlayer();
 
 private:
@@ -29,14 +37,17 @@ private:
     SDL_Window *window;
     SDL_Renderer *renderer;
     SDL_Texture *texture;
+    long frameCnt = 0;
+    string title;
 };
 
-YuvPlayer::YuvPlayer(int w, int h)
+YuvPlayer::YuvPlayer(int w, int h, const string& t)
 : width(w)
 , height(h)
+, title(t)
 {
     SDL_Init(SDL_INIT_VIDEO);
-    window = SDL_CreateWindow("YUV Player", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, width, height, SDL_WINDOW_SHOWN);
+    window = SDL_CreateWindow(title.c_str(), SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, width, height, SDL_WINDOW_SHOWN);
     if (window == nullptr){
         cout << "create error: " << SDL_GetError() << endl;
     }
@@ -46,11 +57,13 @@ YuvPlayer::YuvPlayer(int w, int h)
 
 YuvPlayer::~YuvPlayer()
 {
+    SDL_DestroyTexture(texture);
+    SDL_DestroyRenderer(renderer);
     SDL_DestroyWindow(window);
     SDL_Quit();
 }
 
-void YuvPlayer::play(string file)
+void YuvPlayer::play(string file, int fps)
 {
     size_t frame_size = width * height * 3 / 2;
     uint8_t *raw = (uint8_t *) malloc(sizeof(uint8_t) * frame_size);
@@ -58,11 +71,21 @@ void YuvPlayer::play(string file)
     if (!in.is_open()) {
         cout << "failed to open " << file << endl;
     }
+    cout << "fps " << fps << endl;
 
     SDL_Event event;
     bool quit = false;
+    bool isPlaying = true;
+    int interval = 1000 / fps;
+
     while(!quit) {
-        SDL_WaitEvent(&event);
+        interval = isPlaying ? 1000 / fps : -1;
+        SDL_WaitEventTimeout(&event, interval);
+        if(fps > 0 && isPlaying){
+            if(readFrame(in, raw, frame_size)){
+                updateRenderer(raw);
+            }
+        }
         switch(event.type){
             case SDL_QUIT:
                 quit = true;
@@ -73,8 +96,13 @@ void YuvPlayer::play(string file)
                         quit = true;
                         break;
                     case SDLK_RIGHT:
-                        readFrame(in, raw, frame_size);
-                        updateRenderer(raw);
+                        cout << "Right click" << endl;
+                        if(readFrame(in, raw, frame_size)){
+                            updateRenderer(raw);
+                        }
+                        break;
+                    case SDLK_p:
+                        isPlaying = !isPlaying;
                         break;
                     default:
                         break;
@@ -88,8 +116,15 @@ void YuvPlayer::play(string file)
 
 bool YuvPlayer::readFrame(ifstream& in, uint8_t *raw, size_t size)
 {
-    in.read(reinterpret_cast<char *>(raw), size);
-    return true;
+    bool ret = (bool) in.read(reinterpret_cast<char *>(raw), size);
+    if (ret){
+        frameCnt++;
+        stringstream ss;
+        ss << this->title << " [" << setw(4) << to_string(frameCnt) << "]";
+        cout << "read frame " << frameCnt << endl;
+        SDL_SetWindowTitle(window, ss.str().c_str());
+    }
+    return ret;
 }
 
 void YuvPlayer::updateRenderer(uint8_t *raw)
@@ -100,9 +135,9 @@ void YuvPlayer::updateRenderer(uint8_t *raw)
     SDL_RenderPresent(renderer);
 }
 
-int main()
+int main(int argc, char* argv[])
 {
     string fname = "out.yuv";
     YuvPlayer player(1280, 720);
-    player.play(fname);
+    player.play(fname, 25);
 }
-- 
2.11.0