1 // Generates YUV420 frames with a "landscape with striped crosshair" in the 2 // Y-plane, plus a horizontal gradient in the U-plane and a vertical one in the 3 // V-plane. This makes for a nice mix of colours that is suited for both 4 // catching visual errors and making sure e.g. YUV->RGB/BGR conversion looks 5 // the same on different platforms. 6 // There is also a solid box bouncing around in the Y-plane, and two differently 7 // coloured lines bouncing horizontally and vertically in the U and V plane. 8 // This helps illustrating how the frame boundary goes, and can aid as a quite 9 // handy visual help for noticing e.g. packet loss if the frames are encoded 10 // and sent over the network. 11 12 #ifndef TALK_MEDIA_BASE_YUVFRAMEGENERATOR_H_ 13 #define TALK_MEDIA_BASE_YUVFRAMEGENERATOR_H_ 14 15 #include "talk/base/basictypes.h" 16 17 namespace cricket { 18 19 class YuvFrameGenerator { 20 public: 21 // Constructs a frame-generator that produces frames of size |width|x|height|. 22 // If |enable_barcode| is specified, barcodes can be included in the frames 23 // when calling |GenerateNextFrame(uint8*, uint32)|. If |enable_barcode| is 24 // |true| then |width|x|height| should be at least 160x100; otherwise this 25 // constructor will abort. 26 YuvFrameGenerator(int width, int height, bool enable_barcode); 27 ~YuvFrameGenerator(); 28 29 int GetFrameSize() { return frame_data_size_; } 30 31 // Generate the next frame and return it in the provided |frame_buffer|. If 32 // barcode_value is not |nullptr| the value referred by it will be encoded 33 // into a barcode in the frame. The value should in the range: 34 // [0..9,999,999]. If the value exceeds this range or barcodes were not 35 // requested in the constructor, this function will abort. 36 void GenerateNextFrame(uint8* frame_buffer, int32 barcode_value); 37 38 int GetHeight() { return height_; } 39 int GetWidth() { return width_; } 40 41 // Fetch the bounds of the barcode from the generator. The barcode will 42 // always be at this location. This function will abort if barcodes were not 43 // requested in the constructor. 44 void GetBarcodeBounds(int* top, int* left, int* width, int* height); 45 46 private: 47 void DrawLandscape(uint8 *p, int w, int h); 48 void DrawGradientX(uint8 *p, int w, int h); 49 void DrawGradientY(uint8 *p, int w, int h); 50 void DrawMovingLineX(uint8 *p, int w, int h, int n); 51 void DrawMovingLineY(uint8 *p, int w, int h, int n); 52 void DrawBouncingCube(uint8 *p, int w, int h, int n); 53 54 void DrawBarcode(uint32 value); 55 int DrawSideGuardBars(int x, int y, int height); 56 int DrawMiddleGuardBars(int x, int y, int height); 57 int DrawEanEncodedDigit(int digit, int x, int y, int height, bool r_code); 58 void DrawBlockRectangle(uint8* p, int x_start, int y_start, 59 int width, int height, int pitch, uint8 value); 60 61 private: 62 int width_; 63 int height_; 64 int frame_index_; 65 int frame_data_size_; 66 uint8* y_data_; 67 uint8* u_data_; 68 uint8* v_data_; 69 70 int barcode_start_x_; 71 int barcode_start_y_; 72 73 DISALLOW_COPY_AND_ASSIGN(YuvFrameGenerator); 74 }; 75 76 } // namespace cricket 77 78 #endif // TALK_MEDIA_BASE_YUVFRAMEGENERATOR_H_ 79
