File content as of revision 5:495f7536897b:

// UvcCam.cpp 2013/1/25
#include "mbed.h"
#include "rtos.h"
#include "BaseUsbHost.h"
//#define DEBUG
#include "BaseUsbHostDebug.h"
#define TEST
#include "BaseUsbHostTest.h"
#include "UvcCam.h"

UvcCam::UvcCam(int formatIndex, int frameIndex, uint32_t interval, ControlEp* ctlEp)
{
    uint8_t buf[34];
    int rc;
    int alt;
    int cfg2;
    
    if (ctlEp == NULL) { // root hub
        DBG_OHCI(LPC_USB->HcRhPortStatus1);
        TEST_ASSERT_FALSE(LPC_USB->HcRhPortStatus1 & 0x200);
        ctlEp = new ControlEp();
        TEST_ASSERT_TRUE(ctlEp);
    }
    bool r = check(ctlEp);
    TEST_ASSERT(r);
    m_ctlEp = ctlEp;
    
    UvcCfg* cfg = new UvcCfg(formatIndex, frameIndex, ctlEp);
    TEST_ASSERT(cfg);

    int param_len = 34;
    TEST_ASSERT(cfg->bcdUVC >= 0x0100);
    if (cfg->bcdUVC == 0x0100) { // UVC ver. 1.0
        param_len = 26;
    }
    
    int addr = m_ctlEp->GetAddr();
    m_isoEp = new IsochronousEp(addr, cfg->bEndpointAddress, cfg->wMaxPacketSize);
    TEST_ASSERT_TRUE(m_isoEp);

//#define USE_PROBE

#ifdef USE_PROBE
    rc = Control(GET_INFO, VS_PROBE_CONTROL, 1, buf, 1);
    TEST_ASSERT(rc == USB_OK);
    DBG_BYTES("GET_INFO Prob", buf, 1);

    rc = Control(GET_DEF, VS_PROBE_CONTROL, 1, buf, param_len);
    TEST_ASSERT(rc == USB_OK);
    DBG_BYTES("GET_DEF Probe", buf, param_len);

    rc = Control(GET_MIN, VS_PROBE_CONTROL, 1, buf, param_len);
    TEST_ASSERT(rc == USB_OK);
    DBG_BYTES("GET_MIN Probe", buf, param_len);

    rc = Control(GET_MAX, VS_PROBE_CONTROL, 1, buf, param_len);
    TEST_ASSERT(rc == USB_OK);
    DBG_BYTES("GET_MAX Probe", buf, param_len);

    rc = Control(GET_CUR, VS_PROBE_CONTROL, 1, buf, param_len);
    TEST_ASSERT(rc == USB_OK);
    DBG_BYTES("GET_CUR Probe", buf, param_len);
#endif // USE_PROBE

    rc = Control(GET_INFO, VS_COMMIT_CONTROL, 1, buf, 1);
    TEST_ASSERT(rc == USB_OK);
    DBG_BYTES("GET_INFO Commit", buf, 1);

    memset(buf, 0, param_len);
    buf[2] = cfg->FormatIndex;
    buf[3] = cfg->FrameIndex;
    *reinterpret_cast<uint32_t*>(buf+4) = interval;
    
    DBG_BYTES("SET_CUR Commit", buf, param_len);
    rc = Control(SET_CUR, VS_COMMIT_CONTROL, 1, buf, param_len);
    TEST_ASSERT(rc == USB_OK);

    rc = Control(GET_CUR, VS_COMMIT_CONTROL, 1, buf, param_len);
    TEST_ASSERT(rc == USB_OK);
    TEST_ASSERT_EQUAL(buf[2], cfg->FormatIndex);
    TEST_ASSERT_EQUAL(buf[3], cfg->FrameIndex);
    TEST_ASSERT_EQUAL(*reinterpret_cast<uint32_t*>(buf+4), interval);
    DBG_BYTES("GET_CUR Commit", buf, param_len);

    rc = m_ctlEp->GetConfiguration(&cfg2);
    TEST_ASSERT_EQUAL(rc, USB_OK);
    DBG("config: %d\n", cfg2);

    rc = m_ctlEp->SetConfiguration(1);
    TEST_ASSERT_EQUAL(rc, USB_OK);

    rc = m_ctlEp->GetConfiguration(&cfg2);
    TEST_ASSERT_EQUAL(rc, USB_OK);
    DBG("config: %d\n", cfg2);
    TEST_ASSERT_EQUAL(cfg2, 1);

    rc = m_ctlEp->GetInterface(cfg->bInterface, &alt);
    TEST_ASSERT_EQUAL(rc, USB_OK);
    DBG("alt: %d\n", alt);

    rc = m_ctlEp->SetInterfaceAlternate(cfg->bInterface, cfg->bAlternate);
    TEST_ASSERT_EQUAL(rc, USB_OK);

    rc = m_ctlEp->GetInterface(cfg->bInterface, &alt);
    TEST_ASSERT_EQUAL(rc, USB_OK);
    DBG("alt: %d\n", alt);
    TEST_ASSERT_EQUAL(alt, cfg->bAlternate);
    delete cfg;
    
    for(int i = 0; i < 16; i++) {
        report_cc_count[i] = 0;
        report_ps_cc_count[i] = 0;
    }
  
    LPC_USB->HcControl |= OR_CONTROL_PLE; // PeriodicListEnable
    LPC_USB->HcControl |= OR_CONTROL_IE;  // IsochronousEnable
}

bool UvcCam::check(ControlEp* ctlEp)
{
    if (ctlEp == NULL) {
        return false;
    }
    uint8_t buf[18];
    int r = ctlEp->GetDescriptor(1, 0, buf, 8);
    if (r != USB_OK) {
        return false;
    }
    DBG_HEX(buf, 8);
    const uint8_t desc[] = {0x12,0x01,0x00,0x02,0xef,0x02,0x01};
    if (memcmp(buf, desc, sizeof(desc)) != 0) {
        return false;
    }
    r = ctlEp->GetDescriptor(1, 0, buf, 18);
    if (r != USB_OK) {
        return false;
    }
    DBG_HEX(buf, 18);
    return true;
}

#define  DESCRIPTOR_TYPE_DEVICE        1
#define  DESCRIPTOR_TYPE_CONFIGURATION 2
#define  DESCRIPTOR_TYPE_STRING        3
#define  DESCRIPTOR_TYPE_INTERFACE     4
#define  DESCRIPTOR_TYPE_ENDPOINT      5

#define DESCRIPTOR_TYPE_INTERFACE_ASSOCIATION 0x0b

#define DESCRIPTOR_TYPE_HID          0x21
#define DESCRIPTOR_TYPE_REPORT       0x22
#define DESCRIPTOR_TYPE_PHYSICAL     0x23
#define DESCRIPTOR_TYPE_CS_INTERFACE 0x24
#define DESCRIPTOR_TYPE_CS_ENDPOINT  0x25
#define DESCRIPTOR_TYPE_HUB          0x29

#define CLASS_AUDIO 0x02
#define CLASS_HUB   0x09

#define IF_EQ_THEN_PRINTF(A,B) if (A == B) {VERBOSE("%s\n", #A);
#define ENDIF }

#define CC_AUDIO 0x01
#define SC_AUDIOCONTROL   0x01
#define SC_AUDIOSTREAMING 0x02

#define AC_HEADER          0x01
#define AC_INPUT_TERMINAL  0x02
#define AC_OUTPUT_TERMINAL 0x03
#define AC_FEATURE_UNIT    0x06

// Input Terminal Types
#define ITT_CAMERA 0x0201

static int LE16(const uint8_t* d)
{
    return d[0] | (d[1] << 8);
}

static int LE24(const uint8_t* d) {
    return d[0] | (d[1]<<8) | (d[2] << 16);
}

static int LE32(const uint8_t* d) {
    return d[0] |(d[1]<<8) | (d[2] << 16) |(d[3] << 24) ;
}

UvcCfg::UvcCfg(int formatIndex, int frameIndex, ControlEp* ctlEp):wMaxPacketSize(0)
{
    TEST_ASSERT(ctlEp);
    switch(formatIndex) {
        case UVC_MJPEG: _payload = UVC_MJPEG; break;
        case UVC_YUY2:  _payload = UVC_YUY2; break;
        default:        _payload = UVC_MJPEG; break;
    }

    switch(frameIndex) {
        case UVC_160x120: _width = 160; _height = 120; break;
        case UVC_176x144: _width = 176; _height = 144; break;
        case UVC_320x176: _width = 320; _height = 176; break;
        case UVC_320x240: _width = 320; _height = 240; break;
        case UVC_352x288: _width = 352; _height = 288; break;
        case UVC_432x240: _width = 432; _height = 240; break;
        case UVC_640x480: _width = 640; _height = 480; break;
        case UVC_544x288: _width = 544; _height = 288; break;
        case UVC_640x360: _width = 640; _height = 360; break;
        case UVC_752x416: _width = 752; _height = 416; break;
        case UVC_800x448: _width = 800; _height = 448; break;
        case UVC_800x600: _width = 800; _height = 600; break;
        default:          _width = 160; _height = 120; break;
    }
    int index = 0;
    uint8_t temp[4];
    int rc = ctlEp->GetDescriptor(USB_DESCRIPTOR_TYPE_CONFIGURATION, index, temp, sizeof(temp));
    TEST_ASSERT(rc == USB_OK);
    DBG_BYTES("Config Descriptor 4bytes", temp, sizeof(temp));
    TEST_ASSERT(temp[0] == 9);
    TEST_ASSERT(temp[1] == 0x02);
    int TotalLength = LE16(temp+2);
    DBG("TotalLength: %d\n", TotalLength);

    uint8_t* buf = new uint8_t[TotalLength];
    TEST_ASSERT(buf);
    rc = ctlEp->GetDescriptor(USB_DESCRIPTOR_TYPE_CONFIGURATION, index, buf, TotalLength);
    TEST_ASSERT(rc == USB_OK);
    if (rc != USB_OK) {
        delete[] buf;
        return;
    }
    _parserConfigurationDescriptor(buf, TotalLength);
    delete[] buf;
}

void UvcCfg::_parserAudioControl(uint8_t* buf, int len) {
    int subtype = buf[2];
    IF_EQ_THEN_PRINTF(AC_HEADER, subtype)
    VERBOSE("ADC: %04x\n", LE16(buf+3));
    VERBOSE("TotalLength: %d\n", LE16(buf+5));
    VERBOSE("InCollection: %d\n", buf[7]);
    for (int n = 1; n <= buf[7]; n++) {
        VERBOSE("aInterfaceNr(%d): %d\n", n, buf[8+n-1]);
    }
    ENDIF
    IF_EQ_THEN_PRINTF(AC_INPUT_TERMINAL, subtype)
    VERBOSE("TerminalID: %d\n", buf[3]);
    VERBOSE("TerminalType: %04X\n", LE16(buf+4));
    VERBOSE("AssocTermianl: %d\n", buf[6]);
    VERBOSE("NrChannels: %d\n", buf[7]);
    ENDIF
    IF_EQ_THEN_PRINTF(AC_OUTPUT_TERMINAL, subtype)
    VERBOSE("TerminalID: %d\n", buf[3]);
    VERBOSE("TerminalType: %04X\n", LE16(buf+4));
    VERBOSE("AssocTermianl: %d\n", buf[6]);
    ENDIF
    IF_EQ_THEN_PRINTF(AC_FEATURE_UNIT, subtype)
    VERBOSE("UnitID: %d\n", buf[3]);
    VERBOSE("SourceID: %d\n", buf[4]);
    VERBOSE("ControlSize: %d\n", buf[5]);
    ENDIF
}

#define AS_GENERAL     0x01
#define AS_FORMAT_TYPE 0x02

void UvcCfg::_parserAudioStream(uint8_t* buf, int len) {
    int subtype = buf[2];
    IF_EQ_THEN_PRINTF(AS_GENERAL, subtype)
    VERBOSE("TerminalLink: %d\n", buf[3]);
    VERBOSE("Delay: %d\n", buf[4]);
    VERBOSE("FormatTag: %04x\n", LE16(buf+5));
    ENDIF
    IF_EQ_THEN_PRINTF(AS_FORMAT_TYPE, subtype)
    VERBOSE("FormatType: %d\n", buf[3]);
    VERBOSE("NrChannels: %d\n", buf[4]);
    VERBOSE("SubFrameSize: %d\n", buf[5]);
    VERBOSE("BitResolution: %d\n", buf[6]);
    VERBOSE("SamFreqType: %d\n", buf[7]);
    VERBOSE("SamFreq(1): %d\n", LE24(buf+8));
    ENDIF
}

#define CC_VIDEO 0x0e

#define SC_VIDEOCONTROL   0x01
#define SC_VIDEOSTREAMING 0x02

#define VC_HEADER          0x01
#define VC_INPUT_TERMINAL  0x02
#define VC_OUTPUT_TERMINAL 0x03
#define VC_SELECTOR_UNIT   0x04
#define VC_PROCESSING_UNIT 0x05
#define VC_EXTENSION_UNIT  0x06

void UvcCfg::_parserVideoControl(uint8_t* buf, int len) {
    int subtype = buf[2];
    IF_EQ_THEN_PRINTF(VC_HEADER, subtype)
        bcdUVC = LE16(buf+3);
        VERBOSE("UVC: %04x\n", bcdUVC);
        VERBOSE("TotalLength: %d\n", LE16(buf+5));
        VERBOSE("ClockFrequency: %d\n", LE32(buf+7));
        VERBOSE("InCollection: %d\n", buf[11]);
        VERBOSE("aInterfaceNr(1): %d\n", buf[12]);
    ENDIF
    IF_EQ_THEN_PRINTF(VC_INPUT_TERMINAL, subtype)
        VERBOSE("TerminalID: %d\n", buf[3]);
        uint16_t tt = LE16(buf+4);
        VERBOSE("TerminalType: %04X\n", tt);
        VERBOSE("AssocTerminal: %d\n", buf[6]);
        VERBOSE("Terminal: %d\n", buf[7]);
        if (tt == ITT_CAMERA) { // camera
            int bControlSize = buf[14];
            VERBOSE("ControlSize: %d\n", bControlSize);
            for(int i = 0; i < bControlSize; i++) {
            uint8_t bControls = buf[15+i];
                VERBOSE("Controls(%d): %02X\n", i, bControls); 
            }
        }
    ENDIF
    IF_EQ_THEN_PRINTF(VC_OUTPUT_TERMINAL, subtype)
        VERBOSE("TerminalID: %d\n", buf[3]);
        VERBOSE("TerminalType: %04X\n", LE16(buf+4));
        VERBOSE("AssocTerminal: %d\n", buf[6]);
        VERBOSE("SourceID: %d\n", buf[7]);
        VERBOSE("Terminal: %d\n", buf[8]);
    ENDIF
    IF_EQ_THEN_PRINTF(VC_SELECTOR_UNIT, subtype)
        VERBOSE("UnitID: %d\n", buf[3]);
    ENDIF
    IF_EQ_THEN_PRINTF(VC_PROCESSING_UNIT, subtype)
        VERBOSE("UnitID: %d\n", buf[3]);
        VERBOSE("SourceID: %d\n", buf[4]);
        VERBOSE("MaxMultiplier: %d\n", LE16(buf+5));
        VERBOSE("ControlSize: %d\n", buf[7]);
        int pos = 8;
        for (int n = 1; n <= buf[7]; n++) {
            VERBOSE("Controls(%d): %02X\n", n , buf[pos]);
            pos++;
        }
        VERBOSE("Processing: %d\n", buf[pos]);
        pos++;
        VERBOSE("VideoStanders: %02X\n", buf[pos]);
    ENDIF
    IF_EQ_THEN_PRINTF(VC_EXTENSION_UNIT, subtype)
        VERBOSE("UnitID: %d\n", buf[3]);
    ENDIF
}

#define VS_INPUT_HEADER 0x01
#define VS_STILL_FRAME  0x03
#define VS_FORMAT_UNCOMPRESSED 0x04
#define VS_FRAME_UNCOMPRESSED 0x05
#define VS_FORMAT_MJPEG 0x06
#define VS_FRAME_MJPEG  0x07
#define VS_COLOR_FORMAT 0x0d

void UvcCfg::_parserVideoStream(uint8_t* buf, int len) {
    int subtype = buf[2];
    IF_EQ_THEN_PRINTF(VS_INPUT_HEADER, subtype)
        VERBOSE("NumFormats: %d\n", buf[3]);
        VERBOSE("TotalLength: %d\n", LE16(buf+4));
        VERBOSE("EndpointAddress: %02X\n", buf[6]);
        VERBOSE("Info: %02X\n", buf[7]);
        VERBOSE("TerminalLink: %d\n", buf[8]);
        VERBOSE("StillCaptureMethod: %d\n", buf[9]);
        VERBOSE("TriggerSupport: %d\n", buf[10]);
        VERBOSE("TriggerUsage: %d\n", buf[11]);
        VERBOSE("ControlSize: %d\n", buf[12]);
        int pos = 13;
        for (int n = 1; n <= buf[12]; n++) {
            VERBOSE("Controls(%d): %02X\n", n, buf[pos]);
            pos++;
        }
        bEndpointAddress = buf[6];
    ENDIF
    IF_EQ_THEN_PRINTF(VS_STILL_FRAME, subtype)
    VERBOSE("EndpointAdress: %02X\n", buf[3]);
    VERBOSE("NumImageSizePatterns: %d\n", buf[4]);
    int ptn = buf[4];
    int pos = 5;
    for (int n = 1; n <= ptn; n++) {
        VERBOSE("Width(%d): %d\n", n, LE16(buf+pos));
        VERBOSE("Height(%d): %d\n", n, LE16(buf+pos+2));
        pos += 4;
    }
    VERBOSE("NumCompressPtn: %d\n", buf[pos]);
    ptn = buf[pos++];
    for (int n = 1; n <= ptn; n++) {
        VERBOSE("Compress(%d): %d\n", n, buf[pos]);
        pos++;
    }
    ENDIF
    IF_EQ_THEN_PRINTF(VS_FORMAT_UNCOMPRESSED, subtype)
        VERBOSE("FormatIndex: %d\n", buf[3]);
        VERBOSE("NumFrameDescriptors: %d\n", buf[4]);
        uint32_t guid = LE32(buf+5);
        if (guid == 0x32595559) {
            VERBOSE("GUID: YUY2\n");
        } else if (guid == 0x3231564e) {
            VERBOSE("GUID: NV12\n");
        } else {
            VERBOSE("GUID: %08x\n", guid);
        }
        VERBOSE("DefaultFrameIndex: %d\n", buf[22]);
        if (_payload == UVC_YUY2) {
            FormatIndex = buf[3];
        }
    ENDIF
    IF_EQ_THEN_PRINTF(VS_FRAME_UNCOMPRESSED, subtype)
        VERBOSE("FrameIndex: %d\n", buf[3]);
        VERBOSE("Capabilites: %d\n", buf[4]);
        VERBOSE("Width: %d\n", LE16(buf+5));
        VERBOSE("Height: %d\n", LE16(buf+7));
        VERBOSE("MinBitRate: %d\n", LE32(buf+9));
        VERBOSE("MaxBitRate: %d\n", LE32(buf+13));
        VERBOSE("MaxVideoFrameBufferSize: %d\n", LE32(buf+17));
        VERBOSE("DefaultFrameInterval: %d\n", LE32(buf+21));
        VERBOSE("FrameIntervalType: %d\n", buf[25]);
        int it = buf[25];
        uint32_t max_fi = 333333; // 30.0fps
        if (it == 0) {
            VERBOSE("FrameMinInterval: %d\n", buf[26]);
            VERBOSE("FrameMaxInterval: %d\n", buf[30]);
            VERBOSE("FrameIntervalStep: %d\n", buf[34]);
        } else {
            int pos = 26;
            for (int n = 1; n <= it; n++) {
                uint32_t fi = LE32(buf+pos);
                if (fi >= max_fi) {
                    max_fi = fi;
                }
                float fps = 1e+7 / fi;
                VERBOSE("FrameInterval(%u): %d (%.1f fps)\n", n, fi, fps);
                pos += 4;
            }
        }
        if (_payload == UVC_YUY2) {
            if (_width == LE16(buf+5) && _height == LE16(buf+7)) {
                FrameIndex = buf[3];
            }
            if (dwFrameInterval == 0) {
                dwFrameInterval = max_fi;
            }
        }
    ENDIF
    IF_EQ_THEN_PRINTF(VS_FORMAT_MJPEG, subtype)
        VERBOSE("FormatIndex: %d\n", buf[3]);
        VERBOSE("NumFrameDescriptors: %d\n", buf[4]);
        VERBOSE("Flags: %d\n", buf[5]);
        VERBOSE("DefaultFrameIndex: %d\n", buf[6]);
        if (_payload == UVC_MJPEG) {
            FormatIndex = buf[3];
        }
    ENDIF
    IF_EQ_THEN_PRINTF(VS_FRAME_MJPEG, subtype)
        VERBOSE("FrameIndex: %d\n", buf[3]);
        VERBOSE("Capabilites: %d\n", buf[4]);
        VERBOSE("Width: %d\n", LE16(buf+5));
        VERBOSE("Height: %d\n", LE16(buf+7));
        VERBOSE("MinBitRate: %d\n", LE32(buf+9));
        VERBOSE("MaxBitRate: %d\n", LE32(buf+13));
        VERBOSE("MaxVideoFrameBufferSize: %d\n", LE32(buf+17));
        VERBOSE("DefaultFrameInterval: %d\n", LE32(buf+21));
        VERBOSE("FrameIntervalType: %d\n", buf[25]);
        int it = buf[25];
        uint32_t max_fi = 333333; // 30.0fps
        if (it == 0) {
            VERBOSE("FrameMinInterval: %d\n", buf[26]);
            VERBOSE("FrameMaxInterval: %d\n", buf[30]);
            VERBOSE("FrameIntervalStep: %d\n", buf[34]);
        } else {
            int pos = 26;
            for (int n = 1; n <= it; n++) {
                uint32_t fi = LE32(buf+pos);
                if (fi >= max_fi) {
                    max_fi = fi;
                }
                float fps = 1e+7 / fi;
                VERBOSE("FrameInterval(%u): %d (%.1f fps)\n", n, fi, fps);
                pos += 4;
            }
        }
        if (_payload == UVC_MJPEG) {
            if (_width == LE16(buf+5) && _height == LE16(buf+7)) {
                FrameIndex = buf[3];
            }
            if (dwFrameInterval == 0) {
                dwFrameInterval = max_fi;
            }
        }
    ENDIF
    IF_EQ_THEN_PRINTF(VS_COLOR_FORMAT, subtype)
    ENDIF
}

void UvcCfg::_parserConfigurationDescriptor(uint8_t* buf, int len) {
    int pos = 0;
    _IfClass = 0;
    _IfSubClass = 0;
    while (pos < len) {
        int type = buf[pos+1];
        //DBG_BYTES(TYPE_Str(type), buf+pos, buf[pos]);
        IF_EQ_THEN_PRINTF(DESCRIPTOR_TYPE_CONFIGURATION, type)
            VERBOSE("NumInterfaces: %d\n", buf[pos+4]);
        ENDIF
        IF_EQ_THEN_PRINTF(DESCRIPTOR_TYPE_INTERFACE_ASSOCIATION, type)
            VERBOSE("FirstInterface: %d\n", buf[pos+2]);
            VERBOSE("InterfaceCount: %d\n", buf[pos+3]);
            VERBOSE("FunctionClass: %02X\n", buf[pos+4]);
            VERBOSE("FunctionSubClass: %02X\n", buf[pos+5]);
            VERBOSE("FunctionProtocol: %02X\n", buf[pos+6]);
            VERBOSE("Function: %d\n", buf[pos+7]);
        ENDIF
        IF_EQ_THEN_PRINTF(DESCRIPTOR_TYPE_INTERFACE,type)
            VERBOSE("InterfaceNumber: %d\n", buf[pos+2]);
            VERBOSE("AlternateSetting: %d\n", buf[pos+3]);
            VERBOSE("NumEndpoint: %d\n", buf[pos+4]);
            VERBOSE("InterfaceClass: %02X\n", buf[pos+5]);
            VERBOSE("InterfaceSubClass: %02X\n", buf[pos+6]);
            VERBOSE("InterfaceProtocol: %02X\n", buf[pos+7]);
            VERBOSE("Interface: %d\n", buf[pos+8]);
            _If         = buf[pos+2];
            _Ifalt      = buf[pos+3];
            _IfClass    = buf[pos+5];
            _IfSubClass = buf[pos+6];
        ENDIF
        IF_EQ_THEN_PRINTF(DESCRIPTOR_TYPE_ENDPOINT, type)
            VERBOSE("EndpointAddress: %02X\n", buf[pos+2]);
            VERBOSE("Attributes: %02X\n", buf[pos+3]);
            VERBOSE("MaxPacketSize: %d\n", LE16(buf+pos+4));
            VERBOSE("Interval: %d\n", buf[pos+6]);
            if (_IfClass == CC_VIDEO && _IfSubClass == SC_VIDEOSTREAMING) {
                if (bEndpointAddress == buf[pos+2]) {
                    if (wMaxPacketSize == 0) {
                        wMaxPacketSize = LE16(buf+pos+4);
                    }    
                    if (wMaxPacketSize == LE16(buf+pos+4)) {
                        bInterface = _If;
                        bAlternate = _Ifalt;
                    }
                }
            }
        ENDIF
        IF_EQ_THEN_PRINTF(DESCRIPTOR_TYPE_CS_INTERFACE, type)
            IF_EQ_THEN_PRINTF(CC_VIDEO, _IfClass)
                IF_EQ_THEN_PRINTF(SC_VIDEOCONTROL, _IfSubClass)
                    _parserVideoControl(buf+pos, buf[pos]);
                ENDIF
                IF_EQ_THEN_PRINTF(SC_VIDEOSTREAMING, _IfSubClass)
                    _parserVideoStream(buf+pos, buf[pos]);
                ENDIF
            ENDIF
            IF_EQ_THEN_PRINTF(CC_AUDIO, _IfClass)
                IF_EQ_THEN_PRINTF(SC_AUDIOCONTROL, _IfSubClass)
                    _parserAudioControl(buf+pos, buf[pos]);
                ENDIF 
                IF_EQ_THEN_PRINTF(SC_AUDIOSTREAMING, _IfSubClass)
                    _parserAudioStream(buf+pos, buf[pos]);
                ENDIF
            ENDIF
        ENDIF
        IF_EQ_THEN_PRINTF(DESCRIPTOR_TYPE_HUB, type)
        ENDIF
        pos += buf[pos];
    }
}