1 #ifndef _MOVIT_YCBCR_INPUT_H
2 #define _MOVIT_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.
13 #include "effect_chain.h"
14 #include "image_format.h"
20 // Which formula for Y' to use.
21 YCbCrLumaCoefficients luma_coefficients;
23 // If true, assume Y'CbCr coefficients are full-range, ie. go from 0 to 255
24 // instead of the limited 220/225 steps in classic MPEG. For instance,
25 // JPEG uses the Rec. 601 luma coefficients, but full range.
28 // Sampling factors for chroma components. For no subsampling (4:4:4),
30 unsigned chroma_subsampling_x, chroma_subsampling_y;
32 // Positioning of the chroma samples. MPEG-1 and JPEG is (0.5, 0.5);
33 // MPEG-2 and newer typically are (0.0, 0.5).
34 float cb_x_position, cb_y_position;
35 float cr_x_position, cr_y_position;
38 class YCbCrInput : public Input {
40 YCbCrInput(const ImageFormat &image_format,
41 const YCbCrFormat &ycbcr_format,
42 unsigned width, unsigned height);
45 virtual std::string effect_type_id() const { return "YCbCrInput"; }
47 virtual bool can_output_linear_gamma() const { return false; }
48 virtual AlphaHandling alpha_handling() const { return OUTPUT_BLANK_ALPHA; }
50 std::string output_fragment_shader();
52 // Uploads the texture if it has changed since last time.
53 void set_gl_state(GLuint glsl_program_num, const std::string& prefix, unsigned *sampler_num);
55 unsigned get_width() const { return width; }
56 unsigned get_height() const { return height; }
57 Colorspace get_color_space() const { return image_format.color_space; }
58 GammaCurve get_gamma_curve() const { return image_format.gamma_curve; }
60 // Tells the input where to fetch the actual pixel data. Note that if you change
61 // this data, you must either call set_pixel_data() again (using the same pointer
62 // is fine), or invalidate_pixel_data(). Otherwise, the texture won't be re-uploaded
63 // on subsequent frames.
65 // The data can either be a regular pointer (if pbo==0), or a byte offset
66 // into a PBO. The latter will allow you to start uploading the texture data
67 // asynchronously to the GPU, if you have any CPU-intensive work between the
68 // call to set_pixel_data() and the actual rendering. In either case,
69 // the pointer (and PBO, if set) has to be valid at the time of the render call.
70 void set_pixel_data(unsigned channel, const unsigned char *pixel_data, GLuint pbo = 0)
72 assert(channel >= 0 && channel < 3);
73 this->pixel_data[channel] = pixel_data;
74 this->pbos[channel] = pbo;
75 invalidate_pixel_data();
78 void invalidate_pixel_data();
80 void set_pitch(unsigned channel, unsigned pitch) {
81 assert(channel >= 0 && channel < 3);
82 this->pitch[channel] = pitch;
83 invalidate_pixel_data();
86 virtual void inform_added(EffectChain *chain)
88 resource_pool = chain->get_resource_pool();
92 ImageFormat image_format;
93 YCbCrFormat ycbcr_format;
94 GLuint pbos[3], texture_num[3];
98 unsigned width, height, widths[3], heights[3];
99 const unsigned char *pixel_data[3];
101 ResourcePool *resource_pool;
104 #endif // !defined(_MOVIT_YCBCR_INPUT_H)