v4l.c 27.2 KB
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/*
 * DirectShow capture services (QCAP.DLL)
 *
 * Copyright 2005 Maarten Lankhorst
 *
 * This file contains the part of the vfw capture interface that
 * does the actual Video4Linux(1/2) stuff required for capturing
 * and setting/getting media format..
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
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 */

#include "config.h"
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#include "wine/port.h"
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#define NONAMELESSSTRUCT
#define NONAMELESSUNION
#define COBJMACROS

#include <stdarg.h>
#include "windef.h"
#include "winbase.h"
#include "wtypes.h"
#include "wingdi.h"
#include "winuser.h"
#include "dshow.h"
#include "vfwmsgs.h"
#include "amvideo.h"
#include "wine/debug.h"

#include "capture.h"
#include "qcap_main.h"
#include "pin.h"

#include <stdio.h>
#include <fcntl.h>

#ifdef HAVE_SYS_IOCTL_H
#include <sys/ioctl.h>
#endif
#ifdef HAVE_SYS_MMAN_H
#include <sys/mman.h>
#endif
#ifdef HAVE_SYS_ERRNO_H
#include <sys/errno.h>
#endif
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#ifdef HAVE_ASM_TYPES_H
#include <asm/types.h>
#endif
#ifdef HAVE_LINUX_VIDEODEV_H
#include <linux/videodev.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif

WINE_DEFAULT_DEBUG_CHANNEL(qcap_v4l);

#ifdef HAVE_LINUX_VIDEODEV_H

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typedef void (* Renderer)(const Capture *, LPBYTE bufferin, const BYTE *stream);
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struct _Capture
{
    UINT width, height, bitDepth, fps, outputwidth, outputheight;
    BOOL swresize;

    CRITICAL_SECTION CritSect;

    IPin *pOut;
    int fd, mmap;
    int iscommitted, stopped;
    struct video_picture pict;
    int dbrightness, dhue, dcolour, dcontrast;

    /* mmap (V4l1) */
    struct video_mmap *grab_buf;
    struct video_mbuf gb_buffers;
    unsigned char *pmap;
    int buffers;

    /* read (V4l1) */
    int imagesize;
    char * grab_data;

    int curframe;

    HANDLE thread;
    Renderer renderer;
};

struct renderlist
{
    int depth;
    const char* name;
    Renderer renderer;
};

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static void renderer_RGB(const Capture *capBox, LPBYTE bufferin, const BYTE *stream);
static void renderer_YUV(const Capture *capBox, LPBYTE bufferin, const BYTE *stream);
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static const struct renderlist renderlist_V4l[] = {
    {  0, "NULL renderer",               NULL },
    {  8, "Gray scales",                 NULL }, /* 1,  Don't support  */
    {  0, "High 240 cube (BT848)",       NULL }, /* 2,  Don't support  */
    { 16, "16 bit RGB (565)",            NULL }, /* 3,  Don't support  */
    { 24, "24 bit RGB values",   renderer_RGB }, /* 4,  Supported,     */
    { 32, "32 bit RGB values",   renderer_RGB }, /* 5,  Supported      */
    { 16, "15 bit RGB (555)",            NULL }, /* 6,  Don't support  */
    { 16, "YUV 422 (Not P)",     renderer_YUV }, /* 7,  Supported */
    { 16, "YUYV (Not P)",        renderer_YUV }, /* 8,  Supported */
    { 16, "UYVY (Not P)",        renderer_YUV }, /* 9,  Supported */
    { 16, "YUV 420 (Not P)", NULL }, /* 10, Not supported, if I had to guess it's YYUYYV */
    { 12, "YUV 411 (Not P)",     renderer_YUV }, /* 11, Supported */
    {  0, "Raw capturing (BT848)",       NULL }, /* 12, Don't support  */
    { 16, "YUV 422 (Planar)",    renderer_YUV }, /* 13, Supported */
    { 12, "YUV 411 (Planar)",    renderer_YUV }, /* 14, Supported */
    { 12, "YUV 420 (Planar)",    renderer_YUV }, /* 15, Supported */
    { 10, "YUV 410 (Planar)",    renderer_YUV }, /* 16, Supported */
    /* FIXME: add YUV420 support */
    {  0, NULL,                          NULL },
};

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static const int fallback_V4l[] = { 4, 5, 7, 8, 9, 13, 15, 14, 16, 11, -1 };
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/* Fallback: First try raw formats (Should try yuv first perhaps?), then yuv */

/* static const Capture defbox; */

static int xioctl(int fd, int request, void * arg)
{
    int r;

    do {
        r = ioctl (fd, request, arg);
    } while (-1 == r && EINTR == errno);

    return r;
}

/* Prepare the capture buffers */
static HRESULT V4l_Prepare(Capture *capBox)
{
    TRACE("%p: Preparing for %dx%d resolution\n", capBox, capBox->width, capBox->height);

    /* Try mmap */
    capBox->mmap = 0;
    if (xioctl(capBox->fd, VIDIOCGMBUF, &capBox->gb_buffers) != -1 &&
        capBox->gb_buffers.frames)
    {
        capBox->buffers = capBox->gb_buffers.frames;
        if (capBox->gb_buffers.frames > 1)
            capBox->buffers = 1;
        TRACE("%p: Using %d/%d buffers\n", capBox,
              capBox->buffers, capBox->gb_buffers.frames);

        capBox->pmap = mmap( 0, capBox->gb_buffers.size, PROT_READ|PROT_WRITE,
                             MAP_SHARED, capBox->fd, 0 );
        if (capBox->pmap != MAP_FAILED)
        {
            int i;

            capBox->grab_buf = CoTaskMemAlloc(sizeof(struct video_mmap) * capBox->buffers);
            if (!capBox->grab_buf)
            {
                munmap(capBox->pmap, capBox->gb_buffers.size);
                return E_OUTOFMEMORY;
            }

            /* Setup mmap capture buffers. */
            for (i = 0; i < capBox->buffers; i++)
            {
                capBox->grab_buf[i].format = capBox->pict.palette;
                capBox->grab_buf[i].frame = i;
                capBox->grab_buf[i].width = capBox->width;
                capBox->grab_buf[i].height = capBox->height;
            }
            capBox->mmap = 1;
        }
    }
    if (!capBox->mmap)
    {
        capBox->buffers = 1;
        capBox->imagesize = renderlist_V4l[capBox->pict.palette].depth *
                                capBox->height * capBox->width / 8;
        capBox->grab_data = CoTaskMemAlloc(capBox->imagesize);
        if (!capBox->grab_data)
            return E_OUTOFMEMORY;
    }
    TRACE("Using mmap: %d\n", capBox->mmap);
    return S_OK;
}

static void V4l_Unprepare(Capture *capBox)
{
    if (capBox->mmap)
    {
        for (capBox->curframe = 0; capBox->curframe < capBox->buffers; capBox->curframe++) 
            xioctl(capBox->fd, VIDIOCSYNC, &capBox->grab_buf[capBox->curframe]);
        munmap(capBox->pmap, capBox->gb_buffers.size);
        CoTaskMemFree(capBox->grab_buf);
    }
    else
        CoTaskMemFree(capBox->grab_data);
}

HRESULT qcap_driver_destroy(Capture *capBox)
{
    TRACE("%p\n", capBox);

    if( capBox->fd != -1 )
        close(capBox->fd);
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    capBox->CritSect.DebugInfo->Spare[0] = 0;
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    DeleteCriticalSection(&capBox->CritSect);
    CoTaskMemFree(capBox);
    return S_OK;
}

HRESULT qcap_driver_set_format(Capture *capBox, AM_MEDIA_TYPE * mT)
{
    int newheight, newwidth;
    struct video_window window;
    VIDEOINFOHEADER *format;

    TRACE("%p\n", capBox);

    format = (VIDEOINFOHEADER *) mT->pbFormat;
    if (format->bmiHeader.biBitCount != 24 ||
        format->bmiHeader.biCompression != BI_RGB)
    {
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        FIXME("unsupported media type %d %d\n", format->bmiHeader.biBitCount,
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              format->bmiHeader.biCompression );
        return VFW_E_INVALIDMEDIATYPE;
    }

    newwidth = format->bmiHeader.biWidth;
    newheight = format->bmiHeader.biHeight;

    TRACE("%p -> (%p) - %d %d\n", capBox, mT, newwidth, newheight);

    if (capBox->height == newheight && capBox->width == newwidth)
        return S_OK;

    if(-1 == xioctl(capBox->fd, VIDIOCGWIN, &window))
    {
        ERR("ioctl(VIDIOCGWIN) failed (%d)\n", errno);
        return E_FAIL;
    }
    window.width = newwidth;
    window.height = newheight;
    if (xioctl(capBox->fd, VIDIOCSWIN, &window) == -1)
    {
        TRACE("using software resize: %dx%d -> %dx%d\n",
               window.width, window.height, capBox->width, capBox->height);
        capBox->swresize = TRUE;
    }
    else
    {
        capBox->height = window.height;
        capBox->width = window.width;
        capBox->swresize = FALSE;
    }
    capBox->outputwidth = window.width;
    capBox->outputheight = window.height;
    return S_OK;
}

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HRESULT qcap_driver_get_format(const Capture *capBox, AM_MEDIA_TYPE ** mT)
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{
    VIDEOINFOHEADER *vi;

    mT[0] = CoTaskMemAlloc(sizeof(AM_MEDIA_TYPE));
    if (!mT[0])
        return E_OUTOFMEMORY;
    vi = CoTaskMemAlloc(sizeof(VIDEOINFOHEADER));
    mT[0]->cbFormat = sizeof(VIDEOINFOHEADER);
    if (!vi)
    {
        CoTaskMemFree(mT[0]);
        return E_OUTOFMEMORY;
    }
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    mT[0]->majortype = MEDIATYPE_Video;
    mT[0]->subtype = MEDIASUBTYPE_RGB24;
    mT[0]->formattype = FORMAT_VideoInfo;
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    mT[0]->bFixedSizeSamples = TRUE;
    mT[0]->bTemporalCompression = FALSE;
    mT[0]->pUnk = NULL;
    mT[0]->lSampleSize = capBox->outputwidth * capBox->outputheight * capBox->bitDepth / 8;
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    TRACE("Output format: %dx%d - %d bits = %u KB\n", capBox->outputwidth,
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          capBox->outputheight, capBox->bitDepth, mT[0]->lSampleSize/1024);
    vi->rcSource.left = 0; vi->rcSource.top = 0;
    vi->rcTarget.left = 0; vi->rcTarget.top = 0;
    vi->rcSource.right = capBox->width; vi->rcSource.bottom = capBox->height;
    vi->rcTarget.right = capBox->outputwidth; vi->rcTarget.bottom = capBox->outputheight;
    vi->dwBitRate = capBox->fps * mT[0]->lSampleSize;
    vi->dwBitErrorRate = 0;
    vi->AvgTimePerFrame = (LONGLONG)10000000.0 / (LONGLONG)capBox->fps;
    vi->bmiHeader.biSize = 40;
    vi->bmiHeader.biWidth = capBox->outputwidth;
    vi->bmiHeader.biHeight = capBox->outputheight;
    vi->bmiHeader.biPlanes = 1;
    vi->bmiHeader.biBitCount = 24;
    vi->bmiHeader.biCompression = BI_RGB;
    vi->bmiHeader.biSizeImage = mT[0]->lSampleSize;
    vi->bmiHeader.biClrUsed = vi->bmiHeader.biClrImportant = 0;
    vi->bmiHeader.biXPelsPerMeter = 100;
    vi->bmiHeader.biYPelsPerMeter = 100;
    mT[0]->pbFormat = (void *)vi;
    dump_AM_MEDIA_TYPE(mT[0]);
    return S_OK;
}

HRESULT qcap_driver_get_prop_range( Capture *capBox, long Property, long *pMin,
            long *pMax, long *pSteppingDelta, long *pDefault, long *pCapsFlags )
{
    TRACE("%p -> %ld %p %p %p %p %p\n", capBox, Property,
          pMin, pMax, pSteppingDelta, pDefault, pCapsFlags);

    switch (Property)
    {
    case VideoProcAmp_Brightness:
        *pDefault = capBox->dbrightness;
        break;
    case VideoProcAmp_Contrast:
        *pDefault = capBox->dcontrast;
        break;
    case VideoProcAmp_Hue:
        *pDefault = capBox->dhue;
        break;
    case VideoProcAmp_Saturation:
        *pDefault = capBox->dcolour;
        break;
    default:
        FIXME("Not implemented %ld\n", Property);
        return E_NOTIMPL;
    }
    *pMin = 0;
    *pMax = 65535;
    *pSteppingDelta = 65536/256;
    *pCapsFlags = VideoProcAmp_Flags_Manual;
    return S_OK;
}

HRESULT qcap_driver_get_prop( Capture *capBox, long Property, long *lValue, long *Flags )
{
    TRACE("%p -> %ld %p %p\n", capBox, Property, lValue, Flags);

    switch (Property)
    {
    case VideoProcAmp_Brightness:
        *lValue = capBox->pict.brightness;
        break;
    case VideoProcAmp_Contrast:
        *lValue = capBox->pict.contrast;
        break;
    case VideoProcAmp_Hue:
        *lValue = capBox->pict.hue;
        break;
    case VideoProcAmp_Saturation:
        *lValue = capBox->pict.colour;
        break;
    default:
        FIXME("Not implemented %ld\n", Property);
        return E_NOTIMPL;
    }
    *Flags = VideoProcAmp_Flags_Manual;
    return S_OK;
}

HRESULT qcap_driver_set_prop(Capture *capBox, long Property, long lValue, long Flags)
{
    TRACE("%p -> %ld %ld %ld\n", capBox, Property, lValue, Flags);

    switch (Property)
    {
    case VideoProcAmp_Brightness:
        capBox->pict.brightness = lValue;
        break;
    case VideoProcAmp_Contrast:
        capBox->pict.contrast = lValue;
        break;
    case VideoProcAmp_Hue:
        capBox->pict.hue = lValue;
        break;
    case VideoProcAmp_Saturation:
        capBox->pict.colour = lValue;
        break;
    default:
        FIXME("Not implemented %ld\n", Property);
        return E_NOTIMPL;
    }

    if (xioctl(capBox->fd, VIDIOCSPICT, &capBox->pict) == -1)
    {
        ERR("ioctl(VIDIOCSPICT) failed (%d)\n",errno);
        return E_FAIL;
    }
    return S_OK;
}

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static void renderer_RGB(const Capture *capBox, LPBYTE bufferin, const BYTE *stream)
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{
    int depth = renderlist_V4l[capBox->pict.palette].depth;
    int size = capBox->height * capBox->width * depth / 8;
    int pointer, offset;

    switch (depth)
    {
    case 24:
        memcpy(bufferin, stream, size);
        break;
    case 32:
        pointer = 0;
        offset = 1;
        while (pointer + offset <= size)
        {
            bufferin[pointer] = stream[pointer + offset];
            pointer++;
            bufferin[pointer] = stream[pointer + offset];
            pointer++;
            bufferin[pointer] = stream[pointer + offset];
            pointer++;
            offset++;
        }
        break;
    default:
        ERR("Unknown bit depth %d\n", depth);
        return;
    }
}

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static void renderer_YUV(const Capture *capBox, LPBYTE bufferin, const BYTE *stream)
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{
    enum YUV_Format format;

    switch (capBox->pict.palette)
    {
    case  7: /* YUV422  -  same as YUYV */
    case  8: /* YUYV    */
        format = YUYV;
        break;
    case  9: /* UYVY    */
        format = UYVY;
        break;
    case 11: /* YUV411  */
        format = UYYVYY;
        break;
    case 13: /* YUV422P */
        format = YUVP_421;
        break;
    case 14: /* YUV411P */
        format = YUVP_441;
        break;
    case 15: /* YUV420P */
        format = YUVP_422;
        break;
    case 16: /* YUV410P */
        format = YUVP_444;
        break;
    default:
        ERR("Unknown palette %d\n", capBox->pict.palette);
        return;
    }
    YUV_To_RGB24(format, bufferin, stream, capBox->width, capBox->height);
}

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static void Resize(const Capture * capBox, LPBYTE output, const BYTE *input)
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{
    /* the whole image needs to be reversed,
       because the dibs are messed up in windows */
    if (!capBox->swresize)
    {
        int depth = capBox->bitDepth / 8;
        int inoffset = 0, outoffset = capBox->height * capBox->width * depth;
        int ow = capBox->width * depth;
        while (outoffset > 0)
        {
            int x;
            outoffset -= ow;
            for (x = 0; x < ow; x++)
                output[outoffset + x] = input[inoffset + x];
            inoffset += ow;
        }
    }
    else
    {
        HDC dc_s, dc_d;
        HBITMAP bmp_s, bmp_d;
        int depth = capBox->bitDepth / 8;
        int inoffset = 0, outoffset = (capBox->outputheight) * capBox->outputwidth * depth;
        int ow = capBox->outputwidth * depth;
        LPBYTE myarray;

        /* FIXME: Improve software resizing: add error checks and optimize */

        myarray = CoTaskMemAlloc(capBox->outputwidth * capBox->outputheight * depth);
        dc_s = CreateCompatibleDC(NULL);
        dc_d = CreateCompatibleDC(NULL);
        bmp_s = CreateBitmap(capBox->width, capBox->height, 1, capBox->bitDepth, input);
        bmp_d = CreateBitmap(capBox->outputwidth, capBox->outputheight, 1, capBox->bitDepth, NULL);
        SelectObject(dc_s, bmp_s);
        SelectObject(dc_d, bmp_d);
        StretchBlt(dc_d, 0, 0, capBox->outputwidth, capBox->outputheight,
                   dc_s, 0, 0, capBox->width, capBox->height, SRCCOPY);
        GetBitmapBits(bmp_d, capBox->outputwidth * capBox->outputheight * depth, myarray);
        while (outoffset > 0)
        {
            int i;

            outoffset -= ow;
            for (i = 0; i < ow; i++)
                output[outoffset + i] = myarray[inoffset + i];
            inoffset += ow;
        }
        CoTaskMemFree(myarray);
        DeleteObject(dc_s);
        DeleteObject(dc_d);
        DeleteObject(bmp_s);
        DeleteObject(bmp_d);
    }
}

static void V4l_GetFrame(Capture * capBox, unsigned char ** pInput)
{
    if (capBox->pmap)
    {
        if (xioctl(capBox->fd, VIDIOCSYNC, &capBox->grab_buf[capBox->curframe]) == -1)
            WARN("Syncing ioctl failed: %d\n", errno);

        *pInput = capBox->pmap + capBox->gb_buffers.offsets[capBox->curframe];
    }
    else
    {
        int retval;
        while ((retval = read(capBox->fd, capBox->grab_data, capBox->imagesize)) == -1)
            if (errno != EAGAIN) break;
        if (retval == -1)
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            WARN("Error occurred while reading from device: %s\n", strerror(errno));
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        *pInput = (unsigned char*) capBox->grab_data;
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    }
}

static void V4l_FreeFrame(Capture * capBox)
{
    TRACE("\n");
    if (capBox->mmap)
    {
        if (xioctl(capBox->fd, VIDIOCMCAPTURE, &capBox->grab_buf[capBox->curframe]) == -1)
           ERR("Freeing frame for capture failed: %s\n", strerror(errno));
    }
    if (++capBox->curframe == capBox->buffers)
        capBox->curframe = 0;
}

static DWORD WINAPI ReadThread(LPVOID lParam)
{
    Capture * capBox = (Capture *)lParam;
    HRESULT hr;
    IMediaSample *pSample = NULL;
    unsigned long framecount = 0;
    unsigned char *pTarget, *pInput, *pOutput;

    hr = V4l_Prepare(capBox);
    if (FAILED(hr))
        goto fail;

    pOutput = CoTaskMemAlloc(capBox->width * capBox->height * capBox->bitDepth / 8);
    capBox->curframe = 0;
    do {
        V4l_FreeFrame(capBox);
    } while (capBox->curframe != 0);

    while (1)
    {
        EnterCriticalSection(&capBox->CritSect);
        if (capBox->stopped)
            break;
        hr = OutputPin_GetDeliveryBuffer((OutputPin *)capBox->pOut, &pSample, NULL, NULL, 0);
        if (SUCCEEDED(hr))
        {
            int len;
            
            if (!capBox->swresize)
                len = capBox->height * capBox->width * capBox->bitDepth / 8;
            else
                len = capBox->outputheight * capBox->outputwidth * capBox->bitDepth / 8;
            IMediaSample_SetActualDataLength(pSample, len);

            len = IMediaSample_GetActualDataLength(pSample);
            TRACE("Data length: %d KB\n", len / 1024);

            IMediaSample_GetPointer(pSample, &pTarget);
            /* FIXME: Check return values.. */
            V4l_GetFrame(capBox, &pInput);
            capBox->renderer(capBox, pOutput, pInput);
            Resize(capBox, pTarget, pOutput);
            hr = OutputPin_SendSample((OutputPin *)capBox->pOut, pSample);
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            TRACE("%p -> Frame %lu: %x\n", capBox, ++framecount, hr);
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            IMediaSample_Release(pSample);
            V4l_FreeFrame(capBox);
        }
        LeaveCriticalSection(&capBox->CritSect);
        if (FAILED(hr) && hr != VFW_E_NOT_CONNECTED)
        {
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            ERR("Received error: %x\n", hr);
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            goto cfail;
        }
    }
    LeaveCriticalSection(&capBox->CritSect);
    CoTaskMemFree(pOutput);

    return 0;

cfail:
    CoTaskMemFree(pOutput);
    V4l_Unprepare(capBox);
    LeaveCriticalSection(&capBox->CritSect);

fail:
    capBox->thread = 0; capBox->stopped = 1;
    FIXME("Stop IFilterGraph\n");
    return 0;
}

HRESULT qcap_driver_run(Capture *capBox, FILTER_STATE *state)
{
    HANDLE thread;
    HRESULT hr;

    TRACE("%p -> (%p)\n", capBox, state); 

    if (*state == State_Running) return S_OK;

    EnterCriticalSection(&capBox->CritSect);

    capBox->stopped = 0;

    if (*state == State_Stopped)
    {
        *state = State_Running;
        if (!capBox->iscommitted++)
        {
            IMemAllocator * pAlloc = NULL;
            ALLOCATOR_PROPERTIES ap, actual;
            OutputPin *out;

            ap.cBuffers = 3;
            if (!capBox->swresize)
                ap.cbBuffer = capBox->width * capBox->height;
            else
                ap.cbBuffer = capBox->outputwidth * capBox->outputheight;
            ap.cbBuffer = (ap.cbBuffer * capBox->bitDepth) / 8;
            ap.cbAlign = 1;
            ap.cbPrefix = 0;

            out = (OutputPin *)capBox->pOut;
            hr = IMemInputPin_GetAllocator(out->pMemInputPin, &pAlloc);

            if (SUCCEEDED(hr))
                hr = IMemAllocator_SetProperties(pAlloc, &ap, &actual);

            if (SUCCEEDED(hr))
                hr = IMemAllocator_Commit(pAlloc);

            if (pAlloc)
                IMemAllocator_Release(pAlloc);

682
            TRACE("Committing allocator: %x\n", hr);
683 684 685 686 687 688 689 690 691 692
        }

        thread = CreateThread(NULL, 0, ReadThread, capBox, 0, NULL);
        if (thread)
        {
            capBox->thread = thread;
            SetThreadPriority(thread, THREAD_PRIORITY_LOWEST);
            LeaveCriticalSection(&capBox->CritSect);
            return S_OK;
        }
693
        ERR("Creating thread failed.. %u\n", GetLastError());
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        LeaveCriticalSection(&capBox->CritSect);
        return E_FAIL;
    }

    ResumeThread(capBox->thread);
    *state = State_Running;
    LeaveCriticalSection(&capBox->CritSect);
    return S_OK;
}

HRESULT qcap_driver_pause(Capture *capBox, FILTER_STATE *state)
{
    TRACE("%p -> (%p)\n", capBox, state);     

    if (*state == State_Paused)
        return S_OK;
    if (*state == State_Stopped)
        qcap_driver_run(capBox, state);

    EnterCriticalSection(&capBox->CritSect);
    *state = State_Paused;
    SuspendThread(capBox->thread);
    LeaveCriticalSection(&capBox->CritSect);

    return S_OK;
}

HRESULT qcap_driver_stop(Capture *capBox, FILTER_STATE *state)
{
    TRACE("%p -> (%p)\n", capBox, state);

    if (*state == State_Stopped)
        return S_OK;

    EnterCriticalSection(&capBox->CritSect);

    if (capBox->thread)
    {
        if (*state == State_Paused)
            ResumeThread(capBox->thread);
        capBox->stopped = 1;
        capBox->thread = 0;
        if (capBox->iscommitted)
        {
            IMemInputPin *pMem = NULL;
            IMemAllocator * pAlloc = NULL;
            IPin *pConnect = NULL;
            HRESULT hr;

            capBox->iscommitted = 0;

            hr = IPin_ConnectedTo(capBox->pOut, &pConnect);

            if (SUCCEEDED(hr))
                hr = IPin_QueryInterface(pConnect, &IID_IMemInputPin, (void **) &pMem);

            if (SUCCEEDED(hr))
                hr = IMemInputPin_GetAllocator(pMem, &pAlloc);

            if (SUCCEEDED(hr))
                hr = IMemAllocator_Decommit(pAlloc);

            if (pAlloc)
                IMemAllocator_Release(pAlloc);

            if (pMem)
                IMemInputPin_Release(pMem);

            if (pConnect)
                IPin_Release(pConnect);

            if (hr != S_OK && hr != VFW_E_NOT_COMMITTED)
766
                WARN("Decommitting allocator: %x\n", hr);
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        }
        V4l_Unprepare(capBox);
    }

    *state = State_Stopped;
    LeaveCriticalSection(&capBox->CritSect);
    return S_OK;
}

Capture * qcap_driver_init( IPin *pOut, USHORT card )
{
    Capture * capBox = NULL;
    char device[20];
    struct video_capability capa;
    struct video_picture pict;
    struct video_window window;

    YUV_Init();

    capBox = CoTaskMemAlloc(sizeof(Capture));
    if (!capBox)
        goto error;

    /* capBox->vtbl = &defboxVtbl; */

    InitializeCriticalSection( &capBox->CritSect );
793
    capBox->CritSect.DebugInfo->Spare[0] = (DWORD_PTR)(__FILE__ ": Capture.CritSect");
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    sprintf(device, "/dev/video%i", card);
    TRACE("opening %s\n", device);
    capBox->fd = open(device, O_RDWR | O_NONBLOCK);
    if (capBox->fd == -1)
    {
        WARN("open failed (%d)\n", errno);
        goto error;
    }

    memset(&capa, 0, sizeof(capa));

    if (xioctl(capBox->fd, VIDIOCGCAP, &capa) == -1)
    {
        WARN("ioctl(VIDIOCGCAP) failed (%d)\n", errno);
        goto error;
    }

    if (!(capa.type & VID_TYPE_CAPTURE))
    {
        WARN("not a video capture device\n");
        goto error;
    }

    TRACE("%d inputs on %s\n", capa.channels, capa.name );

    if (xioctl(capBox->fd, VIDIOCGPICT, &pict) == -1)
    {
        ERR("ioctl(VIDIOCGPICT) failed (%d)\n", errno );
        goto error;
    }

    TRACE("depth %d palette %d (%s) hue %d color %d contrast %d\n",
          pict.depth, pict.palette, renderlist_V4l[pict.palette].name,
          pict.hue, pict.colour, pict.contrast );

    capBox->dbrightness = pict.brightness;
    capBox->dcolour = pict.colour;
    capBox->dhue = pict.hue;
    capBox->dcontrast = pict.contrast;

    if (!renderlist_V4l[pict.palette].renderer)
    {
        int palet = pict.palette, i;

        TRACE("No renderer available for %s, falling back to defaults\n",
             renderlist_V4l[pict.palette].name);
        capBox->renderer = NULL;
        for (i = 0; fallback_V4l[i] >=0 ; i++)
        {
            int n = fallback_V4l[i];

            if (renderlist_V4l[n].renderer == NULL)
                continue;

            pict.depth = renderlist_V4l[n].depth;
            pict.palette = n;
            if (xioctl(capBox->fd, VIDIOCSPICT, &pict) == -1)
            {
                TRACE("Could not render with %s (%d)\n",
                      renderlist_V4l[n].name, n);
                continue;
            }
            TRACE("using renderer %s (%d)\n", 
                  renderlist_V4l[n].name, n);
            capBox->renderer = renderlist_V4l[n].renderer;
            break;
        }

        if (!capBox->renderer)
        {
            ERR("video format %s isn't available\n",
                 renderlist_V4l[palet].name);
            goto error;
        }
    }
    else
    {
        TRACE("Using the suggested format\n");
        capBox->renderer = renderlist_V4l[pict.palette].renderer;
    }
    memcpy(&capBox->pict, &pict, sizeof(struct video_picture));

    memset(&window, 0, sizeof(window));
    if (xioctl(capBox->fd, VIDIOCGWIN, &window) == -1)
    {
        WARN("VIDIOCGWIN failed (%d)\n", errno);
        goto error;
    }

    capBox->height = capBox->outputheight = window.height;
    capBox->width = capBox->outputwidth = window.width;
    capBox->swresize = FALSE;
    capBox->bitDepth = 24;
    capBox->pOut = pOut;
    capBox->fps = 3;
    capBox->stopped = 0;
    capBox->curframe = 0;
    capBox->iscommitted = 0;

    TRACE("format: %d bits - %d x %d\n", capBox->bitDepth, capBox->width, capBox->height);

896
    return capBox;
897 898 899

error:
    if (capBox)
900
        qcap_driver_destroy( capBox );
901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929

    return NULL;
}

#else

Capture * qcap_driver_init( IPin *pOut, USHORT card )
{
    const char msg[] = 
        "The v4l headers were not available at compile time,\n"
        "so video capture support is not available.\n";
    MESSAGE(msg);
    return NULL;
}

#define FAIL_WITH_ERR \
    ERR("v4l absent: shouldn't be called\n"); \
    return E_NOTIMPL

HRESULT qcap_driver_destroy(Capture *capBox)
{
    FAIL_WITH_ERR;
}

HRESULT qcap_driver_set_format(Capture *capBox, AM_MEDIA_TYPE * mT)
{
    FAIL_WITH_ERR;
}

930
HRESULT qcap_driver_get_format(const Capture *capBox, AM_MEDIA_TYPE ** mT)
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{
    FAIL_WITH_ERR;
}

HRESULT qcap_driver_get_prop_range( Capture *capBox, long Property, long *pMin,
          long *pMax, long *pSteppingDelta, long *pDefault, long *pCapsFlags )
{
    FAIL_WITH_ERR;
}

HRESULT qcap_driver_get_prop(Capture *capBox, long Property, long *lValue, long *Flags)
{
    FAIL_WITH_ERR;
}

HRESULT qcap_driver_set_prop(Capture *capBox, long Property, long lValue, long Flags)
{
    FAIL_WITH_ERR;
}

HRESULT qcap_driver_run(Capture *capBox, FILTER_STATE *state)
{
    FAIL_WITH_ERR;
}

HRESULT qcap_driver_pause(Capture *capBox, FILTER_STATE *state)
{
    FAIL_WITH_ERR;
}

HRESULT qcap_driver_stop(Capture *capBox, FILTER_STATE *state)
{
    FAIL_WITH_ERR;
}

#endif /* HAVE_LINUX_VIDEODEV_H */