2 #define _YCBCR_INPUT_H 1
4 // YCbCrInput is for handling planar 8-bit Y'CbCr (also sometimes, usually rather
5 // imprecisely, called “YUV”), which is typically what you get from a video decoder.
6 // It upsamples planes as needed, using the default linear upsampling OpenGL gives you.
11 // Which formula for Y' to use.
12 YCbCrLumaCoefficients luma_coefficients;
14 // If true, assume Y'CbCr coefficients are full-range, ie. go from 0 to 255
15 // instead of the limited 220/225 steps in classic MPEG. For instance,
16 // JPEG uses the Rec. 601 luma coefficients, but full range.
19 // Sampling factors for chroma components. For no subsampling (4:4:4),
21 unsigned chroma_subsampling_x, chroma_subsampling_y;
23 // Positioning of the chroma samples. MPEG-1 and JPEG is (0.5, 0.5);
24 // MPEG-2 and newer typically are (0.0, 0.5).
25 float chroma_x_position, chroma_y_position;
28 class YCbCrInput : public Input {
30 YCbCrInput(const ImageFormat &image_format,
31 const YCbCrFormat &ycbcr_format,
32 unsigned width, unsigned height);
34 // Create the texture itself. We cannot do this in the constructor,
35 // because we don't necessarily know all the settings (sRGB texture,
36 // mipmap generation) at that point.
39 virtual bool can_output_linear_gamma() const { return false; }
41 std::string output_fragment_shader();
43 // Uploads the texture if it has changed since last time.
44 void set_gl_state(GLuint glsl_program_num, const std::string& prefix, unsigned *sampler_num);
46 ColorSpace get_color_space() const { return image_format.color_space; }
47 GammaCurve get_gamma_curve() const { return image_format.gamma_curve; }
49 // Tells the input where to fetch the actual pixel data. Note that if you change
50 // this data, you must either call set_pixel_data() again (using the same pointer
51 // is fine), or invalidate_pixel_data(). Otherwise, the texture won't be re-uploaded
52 // on subsequent frames.
53 void set_pixel_data(unsigned channel, const unsigned char *pixel_data)
55 assert(channel >= 0 && channel < 3);
56 this->pixel_data[channel] = pixel_data;
57 invalidate_pixel_data();
60 void invalidate_pixel_data()
65 const unsigned char *get_pixel_data(unsigned channel) const
67 assert(channel >= 0 && channel < 3);
68 return pixel_data[channel];
71 void set_pitch(unsigned channel, unsigned pitch) {
72 assert(channel >= 0 && channel < 3);
73 if (this->pitch[channel] != pitch) {
74 this->pitch[channel] = pitch;
75 needs_pbo_recreate = true;
79 unsigned get_pitch(unsigned channel) {
80 assert(channel >= 0 && channel < 3);
81 return pitch[channel];
85 ImageFormat image_format;
86 YCbCrFormat ycbcr_format;
87 GLuint pbos[3], texture_num[3];
88 bool needs_update, needs_pbo_recreate, finalized;
92 unsigned width, height, widths[3], heights[3];
93 const unsigned char *pixel_data[3];
97 #endif // !defined(_YCBCR_INPUT_H)