/usr/include/movit/ycbcr_input.h is in libmovit-dev 1.1.2-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 | #ifndef _MOVIT_YCBCR_INPUT_H
#define _MOVIT_YCBCR_INPUT_H 1
// YCbCrInput is for handling planar 8-bit Y'CbCr (also sometimes, usually rather
// imprecisely, called “YUV”), which is typically what you get from a video decoder.
// It upsamples planes as needed, using the default linear upsampling OpenGL gives you.
#include <epoxy/gl.h>
#include <assert.h>
#include <string>
#include "effect.h"
#include "effect_chain.h"
#include "image_format.h"
#include "input.h"
namespace movit {
class ResourcePool;
struct YCbCrFormat {
// Which formula for Y' to use.
YCbCrLumaCoefficients luma_coefficients;
// If true, assume Y'CbCr coefficients are full-range, ie. go from 0 to 255
// instead of the limited 220/225 steps in classic MPEG. For instance,
// JPEG uses the Rec. 601 luma coefficients, but full range.
bool full_range;
// Sampling factors for chroma components. For no subsampling (4:4:4),
// set both to 1.
unsigned chroma_subsampling_x, chroma_subsampling_y;
// Positioning of the chroma samples. MPEG-1 and JPEG is (0.5, 0.5);
// MPEG-2 and newer typically are (0.0, 0.5).
float cb_x_position, cb_y_position;
float cr_x_position, cr_y_position;
};
class YCbCrInput : public Input {
public:
YCbCrInput(const ImageFormat &image_format,
const YCbCrFormat &ycbcr_format,
unsigned width, unsigned height);
~YCbCrInput();
virtual std::string effect_type_id() const { return "YCbCrInput"; }
virtual bool can_output_linear_gamma() const { return false; }
virtual AlphaHandling alpha_handling() const { return OUTPUT_BLANK_ALPHA; }
std::string output_fragment_shader();
// Uploads the texture if it has changed since last time.
void set_gl_state(GLuint glsl_program_num, const std::string& prefix, unsigned *sampler_num);
unsigned get_width() const { return width; }
unsigned get_height() const { return height; }
Colorspace get_color_space() const { return image_format.color_space; }
GammaCurve get_gamma_curve() const { return image_format.gamma_curve; }
// Tells the input where to fetch the actual pixel data. Note that if you change
// this data, you must either call set_pixel_data() again (using the same pointer
// is fine), or invalidate_pixel_data(). Otherwise, the texture won't be re-uploaded
// on subsequent frames.
//
// The data can either be a regular pointer (if pbo==0), or a byte offset
// into a PBO. The latter will allow you to start uploading the texture data
// asynchronously to the GPU, if you have any CPU-intensive work between the
// call to set_pixel_data() and the actual rendering. In either case,
// the pointer (and PBO, if set) has to be valid at the time of the render call.
void set_pixel_data(unsigned channel, const unsigned char *pixel_data, GLuint pbo = 0)
{
assert(channel >= 0 && channel < 3);
this->pixel_data[channel] = pixel_data;
this->pbos[channel] = pbo;
invalidate_pixel_data();
}
void invalidate_pixel_data();
void set_pitch(unsigned channel, unsigned pitch) {
assert(channel >= 0 && channel < 3);
this->pitch[channel] = pitch;
invalidate_pixel_data();
}
virtual void inform_added(EffectChain *chain)
{
resource_pool = chain->get_resource_pool();
}
private:
ImageFormat image_format;
YCbCrFormat ycbcr_format;
GLuint pbos[3], texture_num[3];
int needs_mipmaps;
unsigned width, height, widths[3], heights[3];
const unsigned char *pixel_data[3];
unsigned pitch[3];
ResourcePool *resource_pool;
};
} // namespace movit
#endif // !defined(_MOVIT_YCBCR_INPUT_H)
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