12 * ffmpeg -i big_buck_bunny_720p_10mb.mp4 -c:v rawvideo -pix_fmt yuv420p out.yuv
14 * Play YUV with ffplay
15 * ffplay -f rawvideo -pixel_format yuv420p -video_size 1280x720 -i ./out.yuv
18 * 1. press 'P' to pause or play as the given framerate
19 * 2. press 'q' to quit
20 * 3. press RIGHT to next frame, LEFT to previous frame
21 * 4. color space transform
27 YuvPlayer(int width, int height, const string& title = "YUV Player");
28 void play(string fname, int fps = -1);
32 bool readFrame(ifstream& in, uint8_t *raw, size_t size);
33 void updateRenderer(uint8_t *raw);
38 SDL_Renderer *renderer;
44 YuvPlayer::YuvPlayer(int w, int h, const string& t)
49 SDL_Init(SDL_INIT_VIDEO);
50 window = SDL_CreateWindow(title.c_str(), SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, width, height, SDL_WINDOW_SHOWN);
51 if (window == nullptr){
52 cout << "create error: " << SDL_GetError() << endl;
54 renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED);
55 texture = SDL_CreateTexture(renderer, SDL_PIXELFORMAT_IYUV, SDL_TEXTUREACCESS_STREAMING, width, height);
58 YuvPlayer::~YuvPlayer()
60 SDL_DestroyTexture(texture);
61 SDL_DestroyRenderer(renderer);
62 SDL_DestroyWindow(window);
66 void YuvPlayer::play(string file, int fps)
68 size_t frame_size = width * height * 3 / 2;
69 uint8_t *raw = (uint8_t *) malloc(sizeof(uint8_t) * frame_size);
70 ifstream in (file, ios::binary);
72 cout << "failed to open " << file << endl;
74 cout << "fps " << fps << endl;
78 bool isPlaying = true;
79 int interval = 1000 / fps;
82 interval = isPlaying ? 1000 / fps : -1;
83 SDL_WaitEventTimeout(&event, interval);
84 if(fps > 0 && isPlaying){
85 if(readFrame(in, raw, frame_size)){
94 switch(event.key.keysym.sym){
99 cout << "Right click" << endl;
100 if(readFrame(in, raw, frame_size)){
105 isPlaying = !isPlaying;
117 bool YuvPlayer::readFrame(ifstream& in, uint8_t *raw, size_t size)
119 bool ret = (bool) in.read(reinterpret_cast<char *>(raw), size);
123 ss << this->title << " [" << setw(4) << to_string(frameCnt) << "]";
124 cout << "read frame " << frameCnt << endl;
125 SDL_SetWindowTitle(window, ss.str().c_str());
130 void YuvPlayer::updateRenderer(uint8_t *raw)
132 SDL_UpdateTexture(texture, nullptr, raw, width * SDL_BYTESPERPIXEL(SDL_PIXELFORMAT_IYUV));
133 SDL_RenderClear(renderer);
134 SDL_RenderCopy(renderer, texture, nullptr, nullptr);
135 SDL_RenderPresent(renderer);
138 int main(int argc, char* argv[])
140 string fname = "out.yuv";
141 YuvPlayer player(1280, 720);
142 player.play(fname, 25);