V4L2Camera.cpp

/*
 *      This program is free software; you can redistribute it and/or modify
 *      it under the terms of the GNU General Public License as published by
 *      the Free Software Foundation; either version 2 of the License, or
 *      (at your option) any later version.
 *
 */

#define LOG_TAG "V4L2Camera"
#include <utils/Log.h>

extern "C" {
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <cutils/properties.h>
#include <sys/select.h>
#include "uvc_compat.h"
#include "v4l2_formats.h"
};

#include "V4L2Camera.h"
#include "Utils.h"
#include "Converter.h"

#define HEADERFRAME1 0xaf

//#define DEBUG_FRAME 0

#ifdef DEBUG_FRAME
#define LOG_FRAME ALOGD
#else
#define LOG_FRAME ALOGV
#endif

#define CAMERA_USE_FAKE  "camera.use_fake"

namespace android {

V4L2Camera::V4L2Camera ()
        : fd(-1), nQueued(0), nDequeued(0)
{
    videoIn = (struct vdIn *) calloc (1, sizeof (struct vdIn));
}

V4L2Camera::~V4L2Camera()
{
    Close();
    free(videoIn);
}

int V4L2Camera::Open (const char *device)
{
    int ret;

    /* Close the previous instance, if any */
    Close();

    memset(videoIn, 0, sizeof (struct vdIn));

    if ((fd = open(device, O_RDWR)) == -1) {
        ALOGE("ERROR opening V4L interface %s: %s", device, strerror(errno));
        return -1;
    }
    ALOGD("Open %s OK", device);

    ret = ioctl (fd, VIDIOC_QUERYCAP, &videoIn->cap);
    if (ret < 0) {
        ALOGE("Error opening device: unable to query device.");
        return -1;
    }

    if ((videoIn->cap.capabilities & V4L2_CAP_VIDEO_CAPTURE) == 0) {
        ALOGE("Error opening device: video capture not supported.");
        return -1;
    }

    if (!(videoIn->cap.capabilities & V4L2_CAP_STREAMING)) {
        ALOGE("Capture device does not support streaming i/o");
        return -1;
    }

    /* Enumerate all available frame formats */
    EnumFrameFormats();

    return ret;
}

void V4L2Camera::Close ()
{
    /* Release the temporary buffer, if any */
    if (videoIn->tmpBuffer)
        free(videoIn->tmpBuffer);
    videoIn->tmpBuffer = NULL;

    /* Close the file descriptor */
    if (fd > 0)
        close(fd);
    fd = -1;
}

static int my_abs(int x)
{
    return (x < 0) ? -x : x;
}

int V4L2Camera::Init(int width, int height, int fps)
{
    ALOGD("V4L2Camera::Init(%d, %d, %d)", width, height, fps);

    /* Initialize the capture to the specified width and height */
    static const struct {
        int fmt;            /* PixelFormat */
        int bpp;            /* bytes per pixel */
        int isplanar;       /* If format is planar or not */
        int allowscrop;     /* If we support cropping with this pixel format */
    } pixFmtsOrder[] = {
        {V4L2_PIX_FMT_YUYV,     2,0,1},
        {V4L2_PIX_FMT_YVYU,     2,0,1},
        {V4L2_PIX_FMT_UYVY,     2,0,1},
        {V4L2_PIX_FMT_YYUV,     2,0,1},
        {V4L2_PIX_FMT_SPCA501,  2,0,0},
        {V4L2_PIX_FMT_SPCA505,  2,0,0},
        {V4L2_PIX_FMT_SPCA508,  2,0,0},
        {V4L2_PIX_FMT_YUV420,   0,1,0},
        {V4L2_PIX_FMT_YVU420,   0,1,0},
        {V4L2_PIX_FMT_NV12,     0,1,0},
        {V4L2_PIX_FMT_NV21,     0,1,0},
        {V4L2_PIX_FMT_NV16,     0,1,0},
        {V4L2_PIX_FMT_NV61,     0,1,0},
        {V4L2_PIX_FMT_Y41P,     0,0,0},
        {V4L2_PIX_FMT_SGBRG8,   0,0,0},
        {V4L2_PIX_FMT_SGRBG8,   0,0,0},
        {V4L2_PIX_FMT_SBGGR8,   0,0,0},
        {V4L2_PIX_FMT_SRGGB8,   0,0,0},
        {V4L2_PIX_FMT_BGR24,    3,0,1},
        {V4L2_PIX_FMT_RGB24,    3,0,1},
        {V4L2_PIX_FMT_MJPEG,    0,1,0},
        {V4L2_PIX_FMT_JPEG,     0,1,0},
        {V4L2_PIX_FMT_GREY,     1,0,1},
        {V4L2_PIX_FMT_Y16,      2,0,1},
    };

    int ret;

    // If no formats, break here
    if (m_AllFmts.isEmpty()) {
        ALOGE("No video formats available");
        return -1;
    }

    // Try to get the closest match ...
    SurfaceDesc closest;
    int closestDArea = -1;
    int closestDFps = -1;
    unsigned int i;
    int area = width * height;
    for (i = 0; i < m_AllFmts.size(); i++) {
        SurfaceDesc sd = m_AllFmts[i];

        // Always choose a bigger or equal surface
        if (sd.getWidth() >= width &&
            sd.getHeight() >= height) {

            int difArea = sd.getArea() - area;
            int difFps = my_abs(sd.getFps() - fps);

            ALOGD("Trying format: (%d x %d), Fps: %d [difArea:%d, difFps:%d, cDifArea:%d, cDifFps:%d]",sd.getWidth(),sd.getHeight(),sd.getFps(), difArea, difFps, closestDArea, closestDFps);
            if (closestDArea < 0 ||
                difArea < closestDArea ||
                (difArea == closestDArea && difFps < closestDFps)) {

                // Store approximation
                closestDArea = difArea;
                closestDFps = difFps;

                // And the new surface descriptor
                closest = sd;
            }
        }
    }

    if (closestDArea == -1) {
        ALOGE("Size not available: (%d x %d)",width,height);
        return -1;
    }

    ALOGD("Selected format: (%d x %d), Fps: %d",closest.getWidth(),closest.getHeight(),closest.getFps());

    // Check if we will have to crop the captured image
    bool crop = width != closest.getWidth() || height != closest.getHeight();

    // Iterate through pixel formats from best to worst
    ret = -1;
    for (i=0; i < (sizeof(pixFmtsOrder) / sizeof(pixFmtsOrder[0])); i++) {

        // If we will need to crop, make sure to only select formats we can crop...
        if (!crop || pixFmtsOrder[i].allowscrop) {

            memset(&videoIn->format,0,sizeof(videoIn->format));
            videoIn->format.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
            videoIn->format.fmt.pix.width = closest.getWidth();
            videoIn->format.fmt.pix.height = closest.getHeight();
            videoIn->format.fmt.pix.pixelformat = pixFmtsOrder[i].fmt;

            ret = ioctl(fd, VIDIOC_TRY_FMT, &videoIn->format);
            if (ret >= 0 &&
                videoIn->format.fmt.pix.width ==  (uint)closest.getWidth() &&
                videoIn->format.fmt.pix.height == (uint)closest.getHeight()) {
                break;
            }
        }
    }
    if (ret < 0) {
        ALOGE("Open: VIDIOC_TRY_FMT Failed: %s", strerror(errno));
        return ret;
    }

    /* Set the format */
    memset(&videoIn->format,0,sizeof(videoIn->format));
    videoIn->format.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
    videoIn->format.fmt.pix.width = closest.getWidth();
    videoIn->format.fmt.pix.height = closest.getHeight();
    videoIn->format.fmt.pix.pixelformat = pixFmtsOrder[i].fmt;
    ret = ioctl(fd, VIDIOC_S_FMT, &videoIn->format);
    if (ret < 0) {
        ALOGE("Open: VIDIOC_S_FMT Failed: %s", strerror(errno));
        return ret;
    }


    /* Query for the effective video format used */
    memset(&videoIn->format,0,sizeof(videoIn->format));
    videoIn->format.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
    ret = ioctl(fd, VIDIOC_G_FMT, &videoIn->format);
    if (ret < 0) {
        ALOGE("Open: VIDIOC_G_FMT Failed: %s", strerror(errno));
        return ret;
    }

    /* Note VIDIOC_S_FMT may change width and height. */

    /* Buggy driver paranoia. */
    unsigned int min = videoIn->format.fmt.pix.width * 2;
    if (videoIn->format.fmt.pix.bytesperline < min)
        videoIn->format.fmt.pix.bytesperline = min;
    min = videoIn->format.fmt.pix.bytesperline * videoIn->format.fmt.pix.height;
    if (videoIn->format.fmt.pix.sizeimage < min)
        videoIn->format.fmt.pix.sizeimage = min;

    /* Store the pixel formats we will use */
    videoIn->outWidth           = width;
    videoIn->outHeight          = height;
    videoIn->outFrameSize       = width * height << 1; // Calculate the expected output framesize in YUYV
    videoIn->capBytesPerPixel   = pixFmtsOrder[i].bpp;

    /* Now calculate cropping margins, if needed, rounding to even */
    int startX = ((closest.getWidth() - width) >> 1) & (-2);
    int startY = ((closest.getHeight() - height) >> 1) & (-2);

    /* Avoid crashing if the mode found is smaller than the requested */
    if (startX < 0) {
        videoIn->outWidth += startX;
        startX = 0;
    }
    if (startY < 0) {
        videoIn->outHeight += startY;
        startY = 0;
    }

    /* Calculate the starting offset into each captured frame */
    videoIn->capCropOffset = (startX * videoIn->capBytesPerPixel) +
            (videoIn->format.fmt.pix.bytesperline * startY);

    ALOGI("Cropping from origin: %dx%d - size: %dx%d  (offset:%d)",
        startX,startY,
        videoIn->outWidth,videoIn->outHeight,
        videoIn->capCropOffset);

    /* sets video device frame rate */
    memset(&videoIn->params,0,sizeof(videoIn->params));
    videoIn->params.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
    videoIn->params.parm.capture.timeperframe.numerator = 1;
    videoIn->params.parm.capture.timeperframe.denominator = closest.getFps();

    /* Set the framerate. If it fails, it wont be fatal */
    if (ioctl(fd,VIDIOC_S_PARM,&videoIn->params) < 0) {
        ALOGE("VIDIOC_S_PARM error: Unable to set %d fps", closest.getFps());
    }

    /* Gets video device defined frame rate (not real - consider it a maximum value) */
    if (ioctl(fd,VIDIOC_G_PARM,&videoIn->params) < 0) {
        ALOGE("VIDIOC_G_PARM - Unable to get timeperframe");
    }

    ALOGI("Actual format: (%d x %d), Fps: %d, pixfmt: '%c%c%c%c', bytesperline: %d",
        videoIn->format.fmt.pix.width,
        videoIn->format.fmt.pix.height,
        videoIn->params.parm.capture.timeperframe.denominator,
        videoIn->format.fmt.pix.pixelformat & 0xFF, (videoIn->format.fmt.pix.pixelformat >> 8) & 0xFF,
        (videoIn->format.fmt.pix.pixelformat >> 16) & 0xFF, (videoIn->format.fmt.pix.pixelformat >> 24) & 0xFF,
        videoIn->format.fmt.pix.bytesperline);

    /* Configure JPEG quality, if dealing with those formats */
    if (videoIn->format.fmt.pix.pixelformat == V4L2_PIX_FMT_JPEG ||
        videoIn->format.fmt.pix.pixelformat == V4L2_PIX_FMT_MJPEG) {

        /* Get the compression format */
        ioctl(fd,VIDIOC_G_JPEGCOMP, &videoIn->jpegcomp);

        /* Set to maximum */
        videoIn->jpegcomp.quality = 100;

        /* Try to set it */
        if(ioctl(fd,VIDIOC_S_JPEGCOMP, &videoIn->jpegcomp) >= 0)
        {
            ALOGE("VIDIOC_S_COMP:");
            if(errno == EINVAL)
            {
                videoIn->jpegcomp.quality = -1; //not supported
                ALOGE("   compression control not supported\n");
            }
        }

        /* gets video stream jpeg compression parameters */
        if(ioctl(fd,VIDIOC_G_JPEGCOMP, &videoIn->jpegcomp) >= 0) {
            ALOGD("VIDIOC_G_COMP:\n");
            ALOGD("    quality:      %i\n", videoIn->jpegcomp.quality);
            ALOGD("    APPn:         %i\n", videoIn->jpegcomp.APPn);
            ALOGD("    APP_len:      %i\n", videoIn->jpegcomp.APP_len);
            ALOGD("    APP_data:     %s\n", videoIn->jpegcomp.APP_data);
            ALOGD("    COM_len:      %i\n", videoIn->jpegcomp.COM_len);
            ALOGD("    COM_data:     %s\n", videoIn->jpegcomp.COM_data);
            ALOGD("    jpeg_markers: 0x%x\n", videoIn->jpegcomp.jpeg_markers);
        } else {
            ALOGE("VIDIOC_G_COMP:");
            if(errno == EINVAL) {
                videoIn->jpegcomp.quality = -1; //not supported
                ALOGE("   compression control not supported\n");
            }
        }
    }

    /* Check if camera can handle NB_BUFFER buffers */
    memset(&videoIn->rb,0,sizeof(videoIn->rb));
    videoIn->rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
    videoIn->rb.memory = V4L2_MEMORY_MMAP;
    videoIn->rb.count = NB_BUFFER;

    ret = ioctl(fd, VIDIOC_REQBUFS, &videoIn->rb);
    if (ret < 0) {
        ALOGE("Init: VIDIOC_REQBUFS failed: %s", strerror(errno));
        return ret;
    }

    for (int i = 0; i < NB_BUFFER; i++) {

        memset (&videoIn->buf, 0, sizeof (struct v4l2_buffer));
        videoIn->buf.index = i;
        videoIn->buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
        videoIn->buf.memory = V4L2_MEMORY_MMAP;

        ret = ioctl (fd, VIDIOC_QUERYBUF, &videoIn->buf);
        if (ret < 0) {
            ALOGE("Init: Unable to query buffer (%s)", strerror(errno));
            return ret;
        }

        videoIn->mem[i] = mmap (0,
                                videoIn->buf.length,
                                PROT_READ | PROT_WRITE,
                                MAP_SHARED,
                                fd,
                                videoIn->buf.m.offset);

        if (videoIn->mem[i] == MAP_FAILED) {
            ALOGE("Init: Unable to map buffer (%s)", strerror(errno));
            return -1;
        }

        ret = ioctl(fd, VIDIOC_QBUF, &videoIn->buf);
        if (ret < 0) {
            ALOGE("Init: VIDIOC_QBUF Failed");
            return -1;
        }

        nQueued++;
    }

    // Reserve temporary buffers, if they will be needed
    size_t tmpbuf_size=0;
    switch (videoIn->format.fmt.pix.pixelformat)
    {
        case V4L2_PIX_FMT_JPEG:
        case V4L2_PIX_FMT_MJPEG:
        case V4L2_PIX_FMT_UYVY:
        case V4L2_PIX_FMT_YVYU:
        case V4L2_PIX_FMT_YYUV:
        case V4L2_PIX_FMT_YUV420: // only needs 3/2 bytes per pixel but we alloc 2 bytes per pixel
        case V4L2_PIX_FMT_YVU420: // only needs 3/2 bytes per pixel but we alloc 2 bytes per pixel
        case V4L2_PIX_FMT_Y41P:   // only needs 3/2 bytes per pixel but we alloc 2 bytes per pixel
        case V4L2_PIX_FMT_NV12:
        case V4L2_PIX_FMT_NV21:
        case V4L2_PIX_FMT_NV16:
        case V4L2_PIX_FMT_NV61:
        case V4L2_PIX_FMT_SPCA501:
        case V4L2_PIX_FMT_SPCA505:
        case V4L2_PIX_FMT_SPCA508:
        case V4L2_PIX_FMT_GREY:
        case V4L2_PIX_FMT_Y16:

        case V4L2_PIX_FMT_YUYV:
            //  YUYV doesn't need a temp buffer but we will set it if/when
            //  video processing disable control is checked (bayer processing).
            //            (logitech cameras only)
            break;

        case V4L2_PIX_FMT_SGBRG8: //0
        case V4L2_PIX_FMT_SGRBG8: //1
        case V4L2_PIX_FMT_SBGGR8: //2
        case V4L2_PIX_FMT_SRGGB8: //3
            // Raw 8 bit bayer
            // when grabbing use:
            //    bayer_to_rgb24(bayer_data, RGB24_data, width, height, 0..3)
            //    rgb2yuyv(RGB24_data, pFrameBuffer, width, height)

            // alloc a temp buffer for converting to YUYV
            // rgb buffer for decoding bayer data
            tmpbuf_size = videoIn->format.fmt.pix.width * videoIn->format.fmt.pix.height * 3;
            if (videoIn->tmpBuffer)
                free(videoIn->tmpBuffer);
            videoIn->tmpBuffer = (uint8_t*)calloc(1, tmpbuf_size);
            if (!videoIn->tmpBuffer) {
                ALOGE("couldn't calloc %lu bytes of memory for frame buffer\n",
                    (unsigned long) tmpbuf_size);
                return -ENOMEM;
            }


            break;

        case V4L2_PIX_FMT_RGB24: //rgb or bgr (8-8-8)
        case V4L2_PIX_FMT_BGR24:
            break;

        default:
            ALOGE("Should never arrive (1)- exit fatal !!\n");
            return -1;
    }

    return 0;
}

void V4L2Camera::Uninit ()
{
    int ret;

    memset(&videoIn->buf,0,sizeof(videoIn->buf));
    videoIn->buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
    videoIn->buf.memory = V4L2_MEMORY_MMAP;

    /* Dequeue everything */
    int DQcount = nQueued - nDequeued;

    for (int i = 0; i < DQcount-1; i++) {
        ret = ioctl(fd, VIDIOC_DQBUF, &videoIn->buf);
        ALOGE_IF(ret < 0, "Uninit: VIDIOC_DQBUF Failed");
    }
    nQueued = 0;
    nDequeued = 0;

    /* Unmap buffers */
    for (int i = 0; i < NB_BUFFER; i++)
        if (videoIn->mem[i] != NULL) {
            ret = munmap(videoIn->mem[i], videoIn->buf.length);
            ALOGE_IF(ret < 0, "Uninit: Unmap failed");
            videoIn->mem[i] = NULL;
        }

    if (videoIn->tmpBuffer)
        free(videoIn->tmpBuffer);
    videoIn->tmpBuffer = NULL;

}

int V4L2Camera::StartStreaming ()
{
    enum v4l2_buf_type type;
    int ret;

    if (!videoIn->isStreaming) {
        type = V4L2_BUF_TYPE_VIDEO_CAPTURE;

        ret = ioctl (fd, VIDIOC_STREAMON, &type);
        if (ret < 0) {
            ALOGE("StartStreaming: Unable to start capture: %s", strerror(errno));
            return ret;
        }

        videoIn->isStreaming = true;
    }

    return 0;
}

int V4L2Camera::StopStreaming ()
{
    enum v4l2_buf_type type;
    int ret;

    if (videoIn->isStreaming) {
        type = V4L2_BUF_TYPE_VIDEO_CAPTURE;

        ret = ioctl (fd, VIDIOC_STREAMOFF, &type);
        if (ret < 0) {
            ALOGE("StopStreaming: Unable to stop capture: %s", strerror(errno));
            return ret;
        }

        videoIn->isStreaming = false;
    }

    return 0;
}

/* Returns the effective capture size */
void V4L2Camera::getSize(int& width, int& height) const
{
    width =  videoIn->outWidth;
    height = videoIn->outHeight;
}

/* Returns the effective fps */
int V4L2Camera::getFps() const
{
    return videoIn->params.parm.capture.timeperframe.denominator;
}

/* Grab frame in YUYV mode */
void V4L2Camera::GrabRawFrame (void *frameBuffer, int maxSize)
{
    LOG_FRAME("V4L2Camera::GrabRawFrame: frameBuffer:%p, len:%d",frameBuffer,maxSize);
    int ret;

    if(property_get_bool(CAMERA_USE_FAKE, 0)) {
       memset(frameBuffer, 0, maxSize);
       return;
    }

    /* DQ */
    memset(&videoIn->buf,0,sizeof(videoIn->buf));
    videoIn->buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
    videoIn->buf.memory = V4L2_MEMORY_MMAP;
    ret = ioctl(fd, VIDIOC_DQBUF, &videoIn->buf);
    if (ret < 0) {
        ALOGE("GrabPreviewFrame: VIDIOC_DQBUF Failed");
        return;
    }

    nDequeued++;

    // Calculate the stride of the output image (YUYV) in bytes
    int strideOut = videoIn->outWidth << 1;

    // And the pointer to the start of the image
    uint8_t* src = (uint8_t*)videoIn->mem[videoIn->buf.index] + videoIn->capCropOffset;

    LOG_FRAME("V4L2Camera::GrabRawFrame - Got Raw frame (%dx%d) (buf:%d@0x%p, len:%d)",videoIn->format.fmt.pix.width,videoIn->format.fmt.pix.height,videoIn->buf.index,src,videoIn->buf.bytesused);

    /* Avoid crashing! - Make sure there is enough room in the output buffer! */
    if (maxSize < videoIn->outFrameSize) {

        ALOGE("V4L2Camera::GrabRawFrame: Insufficient space in output buffer: Required: %d, Got %d - DROPPING FRAME",videoIn->outFrameSize,maxSize);

    } else {

        switch (videoIn->format.fmt.pix.pixelformat)
        {
            case V4L2_PIX_FMT_JPEG:
            case V4L2_PIX_FMT_MJPEG:
                if(videoIn->buf.bytesused <= HEADERFRAME1) {
                    // Prevent crash on empty image
                    ALOGE("Ignoring empty buffer ...\n");
                    break;
                }

                if (jpeg_decode((uint8_t*)frameBuffer, strideOut, src, videoIn->outWidth, videoIn->outHeight) < 0) {
                    ALOGE("jpeg decode errors\n");
                    break;
                }
                break;

            case V4L2_PIX_FMT_UYVY:
                uyvy_to_yuyv((uint8_t*)frameBuffer, strideOut,
                             src, videoIn->format.fmt.pix.bytesperline, videoIn->outWidth, videoIn->outHeight);
                break;

            case V4L2_PIX_FMT_YVYU:
                yvyu_to_yuyv((uint8_t*)frameBuffer, strideOut,
                             src, videoIn->format.fmt.pix.bytesperline, videoIn->outWidth, videoIn->outHeight);
                break;

            case V4L2_PIX_FMT_YYUV:
                yyuv_to_yuyv((uint8_t*)frameBuffer, strideOut,
                             src, videoIn->format.fmt.pix.bytesperline, videoIn->outWidth, videoIn->outHeight);
                break;

            case V4L2_PIX_FMT_YUV420:
                yuv420_to_yuyv((uint8_t*)frameBuffer, strideOut, src, videoIn->outWidth, videoIn->outHeight);
                break;

            case V4L2_PIX_FMT_YVU420:
                yvu420_to_yuyv((uint8_t*)frameBuffer, strideOut, src, videoIn->outWidth, videoIn->outHeight);
                break;

            case V4L2_PIX_FMT_NV12:
                nv12_to_yuyv((uint8_t*)frameBuffer, strideOut, src, videoIn->outWidth, videoIn->outHeight);
                break;

            case V4L2_PIX_FMT_NV21:
                nv21_to_yuyv((uint8_t*)frameBuffer, strideOut, src, videoIn->outWidth, videoIn->outHeight);
                break;

            case V4L2_PIX_FMT_NV16:
                nv16_to_yuyv((uint8_t*)frameBuffer, strideOut, src, videoIn->outWidth, videoIn->outHeight);
                break;

            case V4L2_PIX_FMT_NV61:
                nv61_to_yuyv((uint8_t*)frameBuffer, strideOut, src, videoIn->outWidth, videoIn->outHeight);
                break;

            case V4L2_PIX_FMT_Y41P:
                y41p_to_yuyv((uint8_t*)frameBuffer, strideOut, src, videoIn->outWidth, videoIn->outHeight);
                break;

            case V4L2_PIX_FMT_GREY:
                grey_to_yuyv((uint8_t*)frameBuffer, strideOut,
                            src, videoIn->format.fmt.pix.bytesperline, videoIn->outWidth, videoIn->outHeight);
                break;

            case V4L2_PIX_FMT_Y16:
                y16_to_yuyv((uint8_t*)frameBuffer, strideOut,
                            src, videoIn->format.fmt.pix.bytesperline, videoIn->outWidth, videoIn->outHeight);
                break;

            case V4L2_PIX_FMT_SPCA501:
                s501_to_yuyv((uint8_t*)frameBuffer, strideOut, src, videoIn->outWidth, videoIn->outHeight);
                break;

            case V4L2_PIX_FMT_SPCA505:
                s505_to_yuyv((uint8_t*)frameBuffer, strideOut, src, videoIn->outWidth, videoIn->outHeight);
                break;

            case V4L2_PIX_FMT_SPCA508:
                s508_to_yuyv((uint8_t*)frameBuffer, strideOut, src, videoIn->outWidth, videoIn->outHeight);
                break;

            case V4L2_PIX_FMT_YUYV:
                {
                    int h;
                    uint8_t* pdst = (uint8_t*)frameBuffer;
                    uint8_t* psrc = src;
                    int ss = videoIn->outWidth << 1;
                    for (h = 0; h < videoIn->outHeight; h++) {
                        memcpy(pdst,psrc,ss);
                        pdst += strideOut;
                        psrc += videoIn->format.fmt.pix.bytesperline;
                    }
                }
                break;

            case V4L2_PIX_FMT_SGBRG8: //0
                bayer_to_rgb24 (src,(uint8_t*) videoIn->tmpBuffer, videoIn->outWidth, videoIn->outHeight, 0);
                rgb_to_yuyv ((uint8_t*) frameBuffer, strideOut,
                            (uint8_t*)videoIn->tmpBuffer, videoIn->outWidth*3, videoIn->outWidth, videoIn->outHeight);
                break;

            case V4L2_PIX_FMT_SGRBG8: //1
                bayer_to_rgb24 (src,(uint8_t*) videoIn->tmpBuffer, videoIn->outWidth, videoIn->outHeight, 1);
                rgb_to_yuyv ((uint8_t*) frameBuffer, strideOut,
                            (uint8_t*)videoIn->tmpBuffer, videoIn->outWidth*3, videoIn->outWidth, videoIn->outHeight);
                break;

            case V4L2_PIX_FMT_SBGGR8: //2
                bayer_to_rgb24 (src,(uint8_t*) videoIn->tmpBuffer, videoIn->outWidth, videoIn->outHeight, 2);
                rgb_to_yuyv ((uint8_t*) frameBuffer, strideOut,
                            (uint8_t*)videoIn->tmpBuffer, videoIn->outWidth*3, videoIn->outWidth, videoIn->outHeight);
                break;

            case V4L2_PIX_FMT_SRGGB8: //3
                bayer_to_rgb24 (src,(uint8_t*) videoIn->tmpBuffer, videoIn->outWidth, videoIn->outHeight, 3);
                rgb_to_yuyv ((uint8_t*) frameBuffer, strideOut,
                            (uint8_t*)videoIn->tmpBuffer, videoIn->outWidth*3, videoIn->outWidth, videoIn->outHeight);
                break;

            case V4L2_PIX_FMT_RGB24:
                rgb_to_yuyv((uint8_t*) frameBuffer, strideOut,
                            src, videoIn->format.fmt.pix.bytesperline, videoIn->outWidth, videoIn->outHeight);
                break;

            case V4L2_PIX_FMT_BGR24:
                bgr_to_yuyv((uint8_t*) frameBuffer, strideOut,
                            src, videoIn->format.fmt.pix.bytesperline, videoIn->outWidth, videoIn->outHeight);
                break;

            default:
                ALOGE("error grabbing: unknown format: %i\n", videoIn->format.fmt.pix.pixelformat);
                break;
        }

        LOG_FRAME("V4L2Camera::GrabRawFrame - Copied frame to destination 0x%p",frameBuffer);
    }

    /* And Queue the buffer again */
    ret = ioctl(fd, VIDIOC_QBUF, &videoIn->buf);
    if (ret < 0) {
        ALOGE("GrabPreviewFrame: VIDIOC_QBUF Failed");
        return;
    }

    nQueued++;

    LOG_FRAME("V4L2Camera::GrabRawFrame - Queued buffer");

}

/* enumerate frame intervals (fps)
 * args:
 * pixfmt: v4l2 pixel format that we want to list frame intervals for
 * width: video width that we want to list frame intervals for
 * height: video height that we want to list frame intervals for
 *
 * returns 0 if enumeration succeded or errno otherwise               */
bool V4L2Camera::EnumFrameIntervals(int pixfmt, int width, int height)
{
    ALOGD("V4L2Camera::EnumFrameIntervals: pixfmt: 0x%08x, w:%d, h:%d",pixfmt,width,height);

    struct v4l2_frmivalenum fival;
    int list_fps=0;
    memset(&fival, 0, sizeof(fival));
    fival.index = 0;
    fival.pixel_format = pixfmt;
    fival.width = width;
    fival.height = height;

    ALOGD("\tTime interval between frame: ");
    while (ioctl(fd,VIDIOC_ENUM_FRAMEINTERVALS, &fival) >= 0)
    {
        fival.index++;
        if (fival.type == V4L2_FRMIVAL_TYPE_DISCRETE) {
            ALOGD("%u/%u", fival.discrete.numerator, fival.discrete.denominator);

            m_AllFmts.add( SurfaceDesc( width, height, fival.discrete.denominator ) );
            list_fps++;
        } else if (fival.type == V4L2_FRMIVAL_TYPE_CONTINUOUS) {
            ALOGD("{min { %u/%u } .. max { %u/%u } }",
                fival.stepwise.min.numerator, fival.stepwise.min.numerator,
                fival.stepwise.max.denominator, fival.stepwise.max.denominator);
            break;
        } else if (fival.type == V4L2_FRMIVAL_TYPE_STEPWISE) {
            ALOGD("{min { %u/%u } .. max { %u/%u } / "
                "stepsize { %u/%u } }",
                fival.stepwise.min.numerator, fival.stepwise.min.denominator,
                fival.stepwise.max.numerator, fival.stepwise.max.denominator,
                fival.stepwise.step.numerator, fival.stepwise.step.denominator);
            break;
        }
    }

    // Assume at least 1fps
    if (list_fps == 0) {
        m_AllFmts.add( SurfaceDesc( width, height, 1 ) );
    }

    return true;
}

/* enumerate frame sizes
 * pixfmt: v4l2 pixel format that we want to list frame sizes for
 *
 * returns 0 if enumeration succeded or errno otherwise               */
bool V4L2Camera::EnumFrameSizes(int pixfmt)
{
    ALOGD("V4L2Camera::EnumFrameSizes: pixfmt: 0x%08x",pixfmt);
    int ret=0;
    int fsizeind = 0;
    struct v4l2_frmsizeenum fsize;

    memset(&fsize, 0, sizeof(fsize));
    fsize.index = 0;
    fsize.pixel_format = pixfmt;
    while (ioctl(fd, VIDIOC_ENUM_FRAMESIZES, &fsize) >= 0) {
        fsize.index++;
        if (fsize.type == V4L2_FRMSIZE_TYPE_DISCRETE) {
            ALOGD("{ discrete: width = %u, height = %u }",
                fsize.discrete.width, fsize.discrete.height);

            fsizeind++;

            if (!EnumFrameIntervals(pixfmt,fsize.discrete.width, fsize.discrete.height))
                ALOGD("  Unable to enumerate frame intervals");
        } else if (fsize.type == V4L2_FRMSIZE_TYPE_CONTINUOUS) {
            ALOGD("{ continuous: min { width = %u, height = %u } .. "
                "max { width = %u, height = %u } }",
                fsize.stepwise.min_width, fsize.stepwise.min_height,
                fsize.stepwise.max_width, fsize.stepwise.max_height);
            ALOGD("  will not enumerate frame intervals.\n");
        } else if (fsize.type == V4L2_FRMSIZE_TYPE_STEPWISE) {
            ALOGD("{ stepwise: min { width = %u, height = %u } .. "
                "max { width = %u, height = %u } / "
                "stepsize { width = %u, height = %u } }",
                fsize.stepwise.min_width, fsize.stepwise.min_height,
                fsize.stepwise.max_width, fsize.stepwise.max_height,
                fsize.stepwise.step_width, fsize.stepwise.step_height);
            ALOGD("  will not enumerate frame intervals.");
        } else {
            ALOGE("  fsize.type not supported: %d\n", fsize.type);
            ALOGE("     (Discrete: %d   Continuous: %d  Stepwise: %d)",
                V4L2_FRMSIZE_TYPE_DISCRETE,
                V4L2_FRMSIZE_TYPE_CONTINUOUS,
                V4L2_FRMSIZE_TYPE_STEPWISE);
        }
    }

    if (fsizeind == 0) {
        /* ------ gspca doesn't enumerate frame sizes ------ */
        /*       negotiate with VIDIOC_TRY_FMT instead       */
        static const struct {
            int w,h;
        } defMode[] = {
            {800,600},
            {768,576},
            {768,480},
            {720,576},
            {720,480},
            {704,576},
            {704,480},
            {640,480},
            {352,288},
            {320,240}
        };

        unsigned int i;
        for (i = 0 ; i < (sizeof(defMode) / sizeof(defMode[0])); i++) {

            fsizeind++;
            struct v4l2_format fmt;
            fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
            fmt.fmt.pix.width = defMode[i].w;
            fmt.fmt.pix.height = defMode[i].h;
            fmt.fmt.pix.pixelformat = pixfmt;
            fmt.fmt.pix.field = V4L2_FIELD_ANY;

            if (ioctl(fd,VIDIOC_TRY_FMT, &fmt) >= 0) {
                ALOGD("{ ?GSPCA? : width = %u, height = %u }\n", fmt.fmt.pix.width, fmt.fmt.pix.height);

                // Add the mode descriptor
                m_AllFmts.add( SurfaceDesc( fmt.fmt.pix.width, fmt.fmt.pix.height, 25 ) );
            }
        }
    }

    return true;
}

/* enumerate frames (formats, sizes and fps)
 * args:
 * width: current selected width
 * height: current selected height
 *
 * returns: pointer to LFormats struct containing list of available frame formats */
bool V4L2Camera::EnumFrameFormats()
{
    ALOGD("V4L2Camera::EnumFrameFormats");
    struct v4l2_fmtdesc fmt;

    // Start with no modes
    m_AllFmts.clear();

    memset(&fmt, 0, sizeof(fmt));
    fmt.index = 0;
    fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;

    while (ioctl(fd,VIDIOC_ENUM_FMT, &fmt) >= 0) {
        fmt.index++;
        ALOGD("{ pixelformat = '%c%c%c%c', description = '%s' }",
                fmt.pixelformat & 0xFF, (fmt.pixelformat >> 8) & 0xFF,
                (fmt.pixelformat >> 16) & 0xFF, (fmt.pixelformat >> 24) & 0xFF,
                fmt.description);

        //enumerate frame sizes for this pixel format
        if (!EnumFrameSizes(fmt.pixelformat)) {
            ALOGE("  Unable to enumerate frame sizes.");
        }
    };

    // Now, select the best preview format and the best PictureFormat
    m_BestPreviewFmt = SurfaceDesc();
    m_BestPictureFmt = SurfaceDesc();

    unsigned int i;
    for (i=0; i<m_AllFmts.size(); i++) {
        SurfaceDesc s = m_AllFmts[i];

        // Prioritize size over everything else when taking pictures. use the
        // least fps possible, as that usually means better quality
        if ((s.getSize()  > m_BestPictureFmt.getSize()) ||
            (s.getSize() == m_BestPictureFmt.getSize() && s.getFps() < m_BestPictureFmt.getFps() )
            ) {
            m_BestPictureFmt = s;
        }

        // Prioritize fps, then size when doing preview
        if ((s.getFps()  > m_BestPreviewFmt.getFps()) ||
            (s.getFps() == m_BestPreviewFmt.getFps() && s.getSize() > m_BestPreviewFmt.getSize() )
            ) {
            m_BestPreviewFmt = s;
        }

    }

    return true;
}

SortedVector<SurfaceSize> V4L2Camera::getAvailableSizes() const
{
    ALOGD("V4L2Camera::getAvailableSizes");
    SortedVector<SurfaceSize> ret;

    // Iterate through the list. All duplicated entries will be removed
    unsigned int i;
    for (i = 0; i< m_AllFmts.size() ; i++) {
        ret.add(m_AllFmts[i].getSize());
    }
    return ret;
}


SortedVector<int> V4L2Camera::getAvailableFps() const
{
    ALOGD("V4L2Camera::getAvailableFps");
    SortedVector<int> ret;

    // Iterate through the list. All duplicated entries will be removed
    unsigned int i;
    for (i = 0; i< m_AllFmts.size() ; i++) {
        ret.add(m_AllFmts[i].getFps());
    }
    return ret;

}

const SurfaceDesc& V4L2Camera::getBestPreviewFmt() const
{
    return m_BestPreviewFmt;
}

const SurfaceDesc& V4L2Camera::getBestPictureFmt() const
{
    return m_BestPictureFmt;
}


}; // namespace android