yuv_to_rgb()

static void fl::third_party::yuv_to_rgb ( const fl::third_party::plm_frame_t * frame, fl::u8 * rgb_buffer )

static

Definition at line 24 of file software_decoder.cpp.hpp.

                                                                                            {
    fl::u32 width = frame->width;
    fl::u32 height = frame->height;
 
    // YUV to RGB conversion coefficients (ITU-R BT.601 standard, scaled by 1000)
    const fl::i32 YUV_TO_RGB_MATRIX[9] = {
        1164,    0, 1596,  // Y, U, V coefficients for R
        1164, -391, -813,  // Y, U, V coefficients for G
        1164, 2017,    0   // Y, U, V coefficients for B (fixed: 2018 -> 2017)
    };
 
    for (fl::u32 y = 0; y < height; y++) {
        for (fl::u32 x = 0; x < width; x++) {
            // Get Y, U, V values
            fl::u32 y_index = y * frame->y.width + x;
            fl::u32 uv_x = x / 2;
            fl::u32 uv_y = y / 2;
            fl::u32 uv_index = uv_y * frame->cr.width + uv_x;
 
            fl::i32 Y = frame->y.data[y_index] - 16;
            fl::i32 U = frame->cb.data[uv_index] - 128;
            fl::i32 V = frame->cr.data[uv_index] - 128;
 
            // Convert to RGB
            fl::i32 R = (YUV_TO_RGB_MATRIX[0] * Y + YUV_TO_RGB_MATRIX[1] * U + YUV_TO_RGB_MATRIX[2] * V) / 1000;
            fl::i32 G = (YUV_TO_RGB_MATRIX[3] * Y + YUV_TO_RGB_MATRIX[4] * U + YUV_TO_RGB_MATRIX[5] * V) / 1000;
            fl::i32 B = (YUV_TO_RGB_MATRIX[6] * Y + YUV_TO_RGB_MATRIX[7] * U + YUV_TO_RGB_MATRIX[8] * V) / 1000;
 
            // Clamp values
            R = R < 0 ? 0 : (R > 255 ? 255 : R);
            G = G < 0 ? 0 : (G > 255 ? 255 : G);
            B = B < 0 ? 0 : (B > 255 ? 255 : B);
 
            // Store RGB values
            fl::u32 rgb_index = (y * width + x) * 3;
            rgb_buffer[rgb_index + 0] = static_cast<fl::u8>(R);
            rgb_buffer[rgb_index + 1] = static_cast<fl::u8>(G);
            rgb_buffer[rgb_index + 2] = static_cast<fl::u8>(B);
        }
    }
}

References fl::B, FL_NOEXCEPT, fl::height, fl::width, fl::x, and fl::y.

Referenced by fl::third_party::SoftwareMpeg1Decoder::videoDecodeCallback().

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