Adding support for UYVY colorformat usb camer

[palcode]

Hi ,

The usb camera which we use all are having UYVY color format

Video input : 0 (Camera 1: ok) Format Video Capture: Width/Height : 1280/720 Pixel Format : 'UYVY' (UYVY 4:2:2)
The by default support YUYV as seen from copy_yuyv_image function .
Any pointers on how to add support for UYVY, which is not compute intensive.
Regards
Pallab Sarkar

[terryky]

Hi,
It requires OpenGLES Shader code which runs on GPU.
currently, shader code for YUYV format is ready as below.
I think you can easily modify it to support UYVY. (just change the order.)

tflite_gles_app/common/util_render2d.c

Lines 130 to 183 in 3c06adf

	/* ------------------------------------------------------ *
	* shader for YUYV Texture
	* +--+--+--+--+
	* | R| G| B| A|
	* +--+--+--+--+
	* |Y0| U|Y1| V|
	* +--+--+--+--+
	* ------------------------------------------------------ */
	static char vs_tex_yuyv[] = " \n\
	attribute vec4 a_Vertex; \n\
	attribute vec2 a_TexCoord; \n\
	varying vec2 v_TexCoord; \n\
	varying vec2 v_TexCoordPix; \n\
	uniform mat4 u_PMVMatrix; \n\
	uniform vec2 u_TexDim; \n\
	\n\
	void main (void) \n\
	{ \n\
	gl_Position = u_PMVMatrix * a_Vertex; \n\
	v_TexCoord = a_TexCoord; \n\
	v_TexCoordPix = a_TexCoord * u_TexDim; \n\
	} \n";
	static char fs_tex_yuyv[] = " \n\
	precision mediump float; \n\
	varying vec2 v_TexCoord; \n\
	varying vec2 v_TexCoordPix; \n\
	uniform sampler2D u_sampler; \n\
	uniform vec4 u_Color; \n\
	\n\
	void main (void) \n\
	{ \n\
	vec2 evenodd = mod(v_TexCoordPix, 2.0); \n\
	vec3 yuv, rgb; \n\
	vec4 texcol = texture2D (u_sampler, v_TexCoord); \n\
	if (evenodd.x < 1.0) \n\
	{ \n\
	yuv.r = texcol.r; /* Y */ \n\
	yuv.g = texcol.g - 0.5; /* U */ \n\
	yuv.b = texcol.a - 0.5; /* V */ \n\
	} \n\
	else \n\
	{ \n\
	yuv.r = texcol.b; /* Y */ \n\
	yuv.g = texcol.g - 0.5; /* U */ \n\
	yuv.b = texcol.a - 0.5; /* V */ \n\
	} \n\
	\n\
	rgb = mat3 ( 1, 1, 1, \n\
	0, -0.34413, 1.772, \n\
	1.402, -0.71414, 0) * yuv; \n\
	gl_FragColor = vec4(rgb, 1.0); \n\
	gl_FragColor *= u_Color; \n\
	} \n";

[terryky]

I've implemented to support UYVY color format.
Could you try gl2blazeface ?
(Since I don't have UYVY camera, I can't check it.)