android - Color Image in the Google Tango Leibniz API -


i trying capture image data in onframeavailable method google tango. using leibniz release. in header file said buffer contains hal_pixel_format_yv12 pixel data. in release notes buffer contains yuv420sp. in documentation said pixels rgba8888 format (). little confused , additionally. don't image data lot of magenta , green. right trying convert yuv rgb similar this one. guess there wrong stride, too. here eís code of onframeavailable method:

int size = (int)(buffer->width * buffer->height); (int = 0; < buffer->height; ++i) {    (int j = 0; j < buffer->width; ++j)    {        float y = buffer->data[i * buffer->stride + j];        float v = buffer->data[(i / 2) * (buffer->stride / 2) + (j / 2) + size];        float u = buffer->data[(i / 2) * (buffer->stride  / 2) + (j / 2) + size + (size / 4)];                 const float umax = 0.436f;                const float vmax = 0.615f;                 y = y / 255.0f;                u =  (u / 255.0f - 0.5f) ;                v =  (v / 255.0f - 0.5f) ;                 tangodata::getinstance().color_buffer[3*(i*width+j)]=y;                tangodata::getinstance().color_buffer[3*(i*width+j)+1]=u;                tangodata::getinstance().color_buffer[3*(i*width+j)+2]=v;    } }

i doing yuv rgb conversion in fragment shader.

has ever obtained rgb image google tango leibniz release? or had similar problems when converting yuv rgb?

yuv420sp (aka nv21) correct time being. explanation here. in format have width x height array each element y byte, followed width/2 x height/2 array each element v byte , u byte. code implementing yv21, has separate arrays v , u instead of interleaving them in 1 array.

you mention doing yuv rgb conversion in fragment shader. if want camera images draw can use tangoservice_connecttextureid() , tangoservice_updatetexture() instead of tangoservice_connectonframeavailable(). approach delivers camera image in opengl texture gives fragment shader rgb values without bothering pixel format details. need bind gl_texture_external_oes (instead of gl_texture_2d), , fragment shader this:

#extension gl_oes_egl_image_external : require  precision mediump float;  varying vec4 v_t; uniform samplerexternaloes colortexture;  void main() {    gl_fragcolor = texture2d(colortexture, v_t.xy); }

if want pass yuv data fragment shader reason, can without preprocessing floats. in fact, don't need unpack @ - nv21 define 1-byte texture y , 2-byte texture vu, , load data as-is. fragment shader use same texture coordinates both.


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