1 #ifndef _CHROMA_SUBSAMPLER_H
2 #define _CHROMA_SUBSAMPLER_H 1
12 class ChromaSubsampler {
14 ChromaSubsampler(movit::ResourcePool *resource_pool);
17 // Subsamples chroma (packed Cb and Cr) 2x2 to yield chroma suitable for
18 // NV12 (semiplanar 4:2:0). Chroma positioning is left/center (H.264 convention).
19 // width and height are the dimensions (in pixels) of the input texture.
21 // You can get two equal copies if you'd like; just set dst2_tex to a texture
22 // number and it will receive an exact copy of what goes into dst_tex.
23 void subsample_chroma(GLuint cbcr_tex, unsigned width, unsigned height, GLuint dst_tex, GLuint dst2_tex = 0);
25 // Subsamples and interleaves luma and chroma to give 4:2:2 packed Y'CbCr (UYVY).
26 // Chroma positioning is left (H.264 convention).
27 // width and height are the dimensions (in pixels) of the input textures.
28 void create_uyvy(GLuint y_tex, GLuint cbcr_tex, unsigned width, unsigned height, GLuint dst_tex);
30 // Subsamples and interleaves luma and chroma to give 10-bit 4:2:2
31 // packed Y'CbCr (v210); see v210converter.h for more information on
32 // the format. Luma and chroma are assumed to be 10-bit data packed
33 // into 16-bit textures. Chroma positioning is left (H.264 convention).
34 // width and height are the dimensions (in pixels) of the input textures;
35 // Requires compute shaders; check v210Converter::has_hardware_support().
36 void create_v210(GLuint y_tex, GLuint cbcr_tex, unsigned width, unsigned height, GLuint dst_tex);
39 movit::ResourcePool *resource_pool;
41 GLuint vbo; // Holds position and texcoord data.
43 GLuint cbcr_program_num; // Owned by <resource_pool>.
44 GLuint cbcr_texture_sampler_uniform;
45 GLint cbcr_position_attribute_index, cbcr_texcoord_attribute_index;
46 GLuint cbcr_chroma_offset_0_location, cbcr_chroma_offset_1_location;
48 GLuint uyvy_program_num; // Owned by <resource_pool>.
49 GLuint uyvy_y_texture_sampler_uniform, uyvy_cbcr_texture_sampler_uniform;
50 GLint uyvy_position_attribute_index, uyvy_texcoord_attribute_index;
51 GLuint uyvy_luma_offset_0_location, uyvy_luma_offset_1_location;
52 GLuint uyvy_chroma_offset_0_location, uyvy_chroma_offset_1_location;
54 GLuint v210_program_num; // Compute shader, so owned by ourselves. Can be 0.
55 GLuint v210_in_y_pos, v210_in_cbcr_pos, v210_outbuf_pos;
56 GLuint v210_inv_width_pos, v210_inv_height_pos;
59 #endif // !defined(_CHROMA_SUBSAMPLER_H)