File content as of revision 3:2709bbf8baae:

#if 0
//
// dump YCrCb
//      [Y0, Y1],
//      (Cr, Cb),
//
#include "mbed.h"
#include "BaseJpegDecode.h"
#include "uvc.h"
#include "Terminal.h"

// Logitech C270
#define WIDTH  160
#define HEIGHT 120

#define ASSERT(A) while(!(A)){fprintf(stderr,"\n\n%s@%d %s ASSERT!\n\n",__PRETTY_FUNCTION__,__LINE__,#A);exit(1);};

DigitalOut led1(LED1), led2(LED2), led3(LED3), led4(LED4);
Terminal term(USBTX, USBRX);

class Decode1 : public BaseJpegDecode {
public:
    int16_t m_y0[WIDTH/16*HEIGHT/8];
    int16_t m_y1[WIDTH/16*HEIGHT/8];
    int16_t m_cb[WIDTH/16*HEIGHT/8];
    int16_t m_cr[WIDTH/16*HEIGHT/8];
    virtual void outputDC(int mcu, int block, int value) {
        if (mcu >= (WIDTH/16*HEIGHT/8)) {
            return;
        }
        switch(block) { // 0-1:Y 2:Cb 3:Cr
            case 0: m_y0[mcu] = value * qt[0][0]; break;
            case 1: m_y1[mcu] = value * qt[0][0]; break;
            case 2: m_cb[mcu] = value * qt[1][0]; break;
            case 3: m_cr[mcu] = value * qt[1][0]; break;
        }
    }
    virtual void outputAC(int mcu, int block, int scan, int value){};
    virtual void outputMARK(uint8_t c){
        if (c == 0xd9) { // EOI
            led2 = !led2;
        }
    };
};

Decode1* decode = NULL;

void callback_motion_jpeg(uint16_t frame, uint8_t* buf, int len)
{
    if (decode) {
        decode->input(buf+12, len-12);
    }
    led1 = buf[1]&1; // FID
}

int main() {
    term.baud(921600);
    printf("%s\n", __FILE__);

    decode = new Decode1;
    ASSERT(decode);
    uvc* cam = new uvc;
    ASSERT(cam);
    cam->SetImageSize(WIDTH, HEIGHT);
    cam->SetFrameInterval(2000000); // 5.0fps
    cam->setOnResult(callback_motion_jpeg);
    ASSERT(cam->setup() >= 0);
    term.cls();
    while(1) {
        int column = 0;
        for(int y = 0; y < HEIGHT/8; y++) {
            term.locate(0, column++);
            for(int x = 0; x < WIDTH/16; x++) {
                int mcu = y*WIDTH/16+x;
                term.printf("%+4d,%+4d,", decode->m_y0[mcu], decode->m_y1[mcu]);
                cam->poll();
            }
            term.locate(0, column++);
            for(int x = 0; x < WIDTH/16; x++) {
                int mcu = y*WIDTH/16+x;
                term.printf("%+4d,%+4d,", decode->m_cb[mcu], decode->m_cr[mcu]);
                cam->poll();
            }
        }
        cam->wait_ms(500);
        led3 = !led3;
    }
}
#endif