vfwcap.c 14.4 KB
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/*
 * VFW capture interface
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 * Copyright (c) 2006-2008 Ramiro Polla
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 *
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 * This file is part of Libav.
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 *
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 * Libav is free software; you can redistribute it and/or
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 * 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.
 *
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 * Libav is distributed in the hope that it will be useful,
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 * 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
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 * License along with Libav; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

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#include "libavformat/avformat.h"
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#include "libavutil/log.h"
#include "libavutil/opt.h"
#include "libavutil/parseutils.h"
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#include <windows.h>
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#include <vfw.h>
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//#define DEBUG_VFW

/* Defines for VFW missing from MinGW.
 * Remove this when MinGW incorporates them. */
#define HWND_MESSAGE                ((HWND)-3)

#define BI_RGB                      0

/* End of missing MinGW defines */

struct vfw_ctx {
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    const AVClass *class;
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    HWND hwnd;
    HANDLE mutex;
    HANDLE event;
    AVPacketList *pktl;
    unsigned int curbufsize;
    unsigned int frame_num;
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    char *video_size;       /**< A string describing video size, set by a private option. */
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};

static enum PixelFormat vfw_pixfmt(DWORD biCompression, WORD biBitCount)
{
    switch(biCompression) {
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    case MKTAG('U', 'Y', 'V', 'Y'):
        return PIX_FMT_UYVY422;
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    case MKTAG('Y', 'U', 'Y', '2'):
        return PIX_FMT_YUYV422;
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    case MKTAG('I', '4', '2', '0'):
        return PIX_FMT_YUV420P;
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    case BI_RGB:
        switch(biBitCount) { /* 1-8 are untested */
            case 1:
                return PIX_FMT_MONOWHITE;
            case 4:
                return PIX_FMT_RGB4;
            case 8:
                return PIX_FMT_RGB8;
            case 16:
                return PIX_FMT_RGB555;
            case 24:
                return PIX_FMT_BGR24;
            case 32:
                return PIX_FMT_RGB32;
        }
    }
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    return PIX_FMT_NONE;
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}

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static enum CodecID vfw_codecid(DWORD biCompression)
{
    switch(biCompression) {
    case MKTAG('d', 'v', 's', 'd'):
        return CODEC_ID_DVVIDEO;
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    case MKTAG('M', 'J', 'P', 'G'):
    case MKTAG('m', 'j', 'p', 'g'):
        return CODEC_ID_MJPEG;
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    }
    return CODEC_ID_NONE;
}

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#define dstruct(pctx, sname, var, type) \
    av_log(pctx, AV_LOG_DEBUG, #var":\t%"type"\n", sname->var)

static void dump_captureparms(AVFormatContext *s, CAPTUREPARMS *cparms)
{
    av_log(s, AV_LOG_DEBUG, "CAPTUREPARMS\n");
    dstruct(s, cparms, dwRequestMicroSecPerFrame, "lu");
    dstruct(s, cparms, fMakeUserHitOKToCapture, "d");
    dstruct(s, cparms, wPercentDropForError, "u");
    dstruct(s, cparms, fYield, "d");
    dstruct(s, cparms, dwIndexSize, "lu");
    dstruct(s, cparms, wChunkGranularity, "u");
    dstruct(s, cparms, fUsingDOSMemory, "d");
    dstruct(s, cparms, wNumVideoRequested, "u");
    dstruct(s, cparms, fCaptureAudio, "d");
    dstruct(s, cparms, wNumAudioRequested, "u");
    dstruct(s, cparms, vKeyAbort, "u");
    dstruct(s, cparms, fAbortLeftMouse, "d");
    dstruct(s, cparms, fAbortRightMouse, "d");
    dstruct(s, cparms, fLimitEnabled, "d");
    dstruct(s, cparms, wTimeLimit, "u");
    dstruct(s, cparms, fMCIControl, "d");
    dstruct(s, cparms, fStepMCIDevice, "d");
    dstruct(s, cparms, dwMCIStartTime, "lu");
    dstruct(s, cparms, dwMCIStopTime, "lu");
    dstruct(s, cparms, fStepCaptureAt2x, "d");
    dstruct(s, cparms, wStepCaptureAverageFrames, "u");
    dstruct(s, cparms, dwAudioBufferSize, "lu");
    dstruct(s, cparms, fDisableWriteCache, "d");
    dstruct(s, cparms, AVStreamMaster, "u");
}

static void dump_videohdr(AVFormatContext *s, VIDEOHDR *vhdr)
{
#ifdef DEBUG_VFW
    av_log(s, AV_LOG_DEBUG, "VIDEOHDR\n");
    dstruct(s, vhdr, lpData, "p");
    dstruct(s, vhdr, dwBufferLength, "lu");
    dstruct(s, vhdr, dwBytesUsed, "lu");
    dstruct(s, vhdr, dwTimeCaptured, "lu");
    dstruct(s, vhdr, dwUser, "lu");
    dstruct(s, vhdr, dwFlags, "lu");
    dstruct(s, vhdr, dwReserved[0], "lu");
    dstruct(s, vhdr, dwReserved[1], "lu");
    dstruct(s, vhdr, dwReserved[2], "lu");
    dstruct(s, vhdr, dwReserved[3], "lu");
#endif
}

static void dump_bih(AVFormatContext *s, BITMAPINFOHEADER *bih)
{
    av_log(s, AV_LOG_DEBUG, "BITMAPINFOHEADER\n");
    dstruct(s, bih, biSize, "lu");
    dstruct(s, bih, biWidth, "ld");
    dstruct(s, bih, biHeight, "ld");
    dstruct(s, bih, biPlanes, "d");
    dstruct(s, bih, biBitCount, "d");
    dstruct(s, bih, biCompression, "lu");
    av_log(s, AV_LOG_DEBUG, "    biCompression:\t\"%.4s\"\n",
                   (char*) &bih->biCompression);
    dstruct(s, bih, biSizeImage, "lu");
    dstruct(s, bih, biXPelsPerMeter, "lu");
    dstruct(s, bih, biYPelsPerMeter, "lu");
    dstruct(s, bih, biClrUsed, "lu");
    dstruct(s, bih, biClrImportant, "lu");
}

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static int shall_we_drop(AVFormatContext *s)
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{
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    struct vfw_ctx *ctx = s->priv_data;
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    const uint8_t dropscore[] = {62, 75, 87, 100};
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    const int ndropscores = FF_ARRAY_ELEMS(dropscore);
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    unsigned int buffer_fullness = (ctx->curbufsize*100)/s->max_picture_buffer;

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    if(dropscore[++ctx->frame_num%ndropscores] <= buffer_fullness) {
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        av_log(s, AV_LOG_ERROR,
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              "real-time buffer %d%% full! frame dropped!\n", buffer_fullness);
        return 1;
    }

    return 0;
}

static LRESULT CALLBACK videostream_cb(HWND hwnd, LPVIDEOHDR vdhdr)
{
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    AVFormatContext *s;
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    struct vfw_ctx *ctx;
    AVPacketList **ppktl, *pktl_next;

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    s = (AVFormatContext *) GetWindowLongPtr(hwnd, GWLP_USERDATA);
    ctx = s->priv_data;
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    dump_videohdr(s, vdhdr);
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    if(shall_we_drop(s))
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        return FALSE;

    WaitForSingleObject(ctx->mutex, INFINITE);

    pktl_next = av_mallocz(sizeof(AVPacketList));
    if(!pktl_next)
        goto fail;

    if(av_new_packet(&pktl_next->pkt, vdhdr->dwBytesUsed) < 0) {
        av_free(pktl_next);
        goto fail;
    }

    pktl_next->pkt.pts = vdhdr->dwTimeCaptured;
    memcpy(pktl_next->pkt.data, vdhdr->lpData, vdhdr->dwBytesUsed);

    for(ppktl = &ctx->pktl ; *ppktl ; ppktl = &(*ppktl)->next);
    *ppktl = pktl_next;

    ctx->curbufsize += vdhdr->dwBytesUsed;

    SetEvent(ctx->event);
    ReleaseMutex(ctx->mutex);

    return TRUE;
fail:
    ReleaseMutex(ctx->mutex);
    return FALSE;
}

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static int vfw_read_close(AVFormatContext *s)
{
    struct vfw_ctx *ctx = s->priv_data;
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    AVPacketList *pktl;
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    if(ctx->hwnd) {
        SendMessage(ctx->hwnd, WM_CAP_SET_CALLBACK_VIDEOSTREAM, 0, 0);
        SendMessage(ctx->hwnd, WM_CAP_DRIVER_DISCONNECT, 0, 0);
        DestroyWindow(ctx->hwnd);
    }
    if(ctx->mutex)
        CloseHandle(ctx->mutex);
    if(ctx->event)
        CloseHandle(ctx->event);

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    pktl = ctx->pktl;
    while (pktl) {
        AVPacketList *next = pktl->next;
        av_destruct_packet(&pktl->pkt);
        av_free(pktl);
        pktl = next;
    }

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    av_freep(&ctx->video_size);

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    return 0;
}
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static int vfw_read_header(AVFormatContext *s, AVFormatParameters *ap)
{
    struct vfw_ctx *ctx = s->priv_data;
    AVCodecContext *codec;
    AVStream *st;
    int devnum;
    int bisize;
    BITMAPINFO *bi;
    CAPTUREPARMS cparms;
    DWORD biCompression;
    WORD biBitCount;
    int ret;

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    if (!strcmp(s->filename, "list")) {
        for (devnum = 0; devnum <= 9; devnum++) {
            char driver_name[256];
            char driver_ver[256];
            ret = capGetDriverDescription(devnum,
                                          driver_name, sizeof(driver_name),
                                          driver_ver, sizeof(driver_ver));
            if (ret) {
                av_log(s, AV_LOG_INFO, "Driver %d\n", devnum);
                av_log(s, AV_LOG_INFO, " %s\n", driver_name);
                av_log(s, AV_LOG_INFO, " %s\n", driver_ver);
            }
        }
        return AVERROR(EIO);
    }

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    if(!ap->time_base.den) {
        av_log(s, AV_LOG_ERROR, "A time base must be specified.\n");
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        return AVERROR(EIO);
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    }

    ctx->hwnd = capCreateCaptureWindow(NULL, 0, 0, 0, 0, 0, HWND_MESSAGE, 0);
    if(!ctx->hwnd) {
        av_log(s, AV_LOG_ERROR, "Could not create capture window.\n");
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        return AVERROR(EIO);
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    }

    /* If atoi fails, devnum==0 and the default device is used */
    devnum = atoi(s->filename);

    ret = SendMessage(ctx->hwnd, WM_CAP_DRIVER_CONNECT, devnum, 0);
    if(!ret) {
        av_log(s, AV_LOG_ERROR, "Could not connect to device.\n");
        DestroyWindow(ctx->hwnd);
        return AVERROR(ENODEV);
    }

    SendMessage(ctx->hwnd, WM_CAP_SET_OVERLAY, 0, 0);
    SendMessage(ctx->hwnd, WM_CAP_SET_PREVIEW, 0, 0);

    ret = SendMessage(ctx->hwnd, WM_CAP_SET_CALLBACK_VIDEOSTREAM, 0,
                      (LPARAM) videostream_cb);
    if(!ret) {
        av_log(s, AV_LOG_ERROR, "Could not set video stream callback.\n");
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        goto fail_io;
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    }

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    SetWindowLongPtr(ctx->hwnd, GWLP_USERDATA, (LONG_PTR) s);
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    st = av_new_stream(s, 0);
    if(!st) {
        vfw_read_close(s);
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        return AVERROR(ENOMEM);
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    }

    /* Set video format */
    bisize = SendMessage(ctx->hwnd, WM_CAP_GET_VIDEOFORMAT, 0, 0);
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    if(!bisize)
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        goto fail_io;
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    bi = av_malloc(bisize);
    if(!bi) {
        vfw_read_close(s);
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        return AVERROR(ENOMEM);
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    }
    ret = SendMessage(ctx->hwnd, WM_CAP_GET_VIDEOFORMAT, bisize, (LPARAM) bi);
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    if(!ret)
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        goto fail_bi;
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    dump_bih(s, &bi->bmiHeader);

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    if (ctx->video_size) {
        ret = av_parse_video_size(&bi->bmiHeader.biWidth, &bi->bmiHeader.biHeight, ctx->video_size);
        if (ret < 0) {
            av_log(s, AV_LOG_ERROR, "Couldn't parse video size.\n");
            goto fail_bi;
        }
    }
#if FF_API_FORMAT_PARAMETERS
    if (ap->width > 0)
        bi->bmiHeader.biWidth = ap->width;
    if (ap->height > 0)
        bi->bmiHeader.biHeight = ap->height;
#endif
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    if (0) {
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        /* For testing yet unsupported compressions
         * Copy these values from user-supplied verbose information */
        bi->bmiHeader.biWidth       = 320;
        bi->bmiHeader.biHeight      = 240;
        bi->bmiHeader.biPlanes      = 1;
        bi->bmiHeader.biBitCount    = 12;
        bi->bmiHeader.biCompression = MKTAG('I','4','2','0');
        bi->bmiHeader.biSizeImage   = 115200;
        dump_bih(s, &bi->bmiHeader);
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    }
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    ret = SendMessage(ctx->hwnd, WM_CAP_SET_VIDEOFORMAT, bisize, (LPARAM) bi);
    if(!ret) {
        av_log(s, AV_LOG_ERROR, "Could not set Video Format.\n");
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        goto fail_bi;
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    }

    biCompression = bi->bmiHeader.biCompression;
    biBitCount = bi->bmiHeader.biBitCount;

    av_free(bi);

    /* Set sequence setup */
    ret = SendMessage(ctx->hwnd, WM_CAP_GET_SEQUENCE_SETUP, sizeof(cparms),
                      (LPARAM) &cparms);
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    if(!ret)
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        goto fail_io;
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    dump_captureparms(s, &cparms);

    cparms.fYield = 1; // Spawn a background thread
    cparms.dwRequestMicroSecPerFrame =
                               (ap->time_base.num*1000000) / ap->time_base.den;
    cparms.fAbortLeftMouse = 0;
    cparms.fAbortRightMouse = 0;
    cparms.fCaptureAudio = 0;
    cparms.vKeyAbort = 0;

    ret = SendMessage(ctx->hwnd, WM_CAP_SET_SEQUENCE_SETUP, sizeof(cparms),
                      (LPARAM) &cparms);
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    if(!ret)
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        goto fail_io;
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    codec = st->codec;
    codec->time_base = ap->time_base;
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    codec->codec_type = AVMEDIA_TYPE_VIDEO;
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    codec->width  = bi->bmiHeader.biWidth;
    codec->height = bi->bmiHeader.biHeight;
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    codec->pix_fmt = vfw_pixfmt(biCompression, biBitCount);
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    if(codec->pix_fmt == PIX_FMT_NONE) {
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        codec->codec_id = vfw_codecid(biCompression);
        if(codec->codec_id == CODEC_ID_NONE) {
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            av_log(s, AV_LOG_ERROR, "Unknown compression type. "
                             "Please report verbose (-v 9) debug information.\n");
            vfw_read_close(s);
            return AVERROR_PATCHWELCOME;
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        }
        codec->bits_per_coded_sample = biBitCount;
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    } else {
        codec->codec_id = CODEC_ID_RAWVIDEO;
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        if(biCompression == BI_RGB) {
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            codec->bits_per_coded_sample = biBitCount;
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            codec->extradata = av_malloc(9 + FF_INPUT_BUFFER_PADDING_SIZE);
            if (codec->extradata) {
                codec->extradata_size = 9;
                memcpy(codec->extradata, "BottomUp", 9);
            }
        }
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    }
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    av_set_pts_info(st, 32, 1, 1000);
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    ctx->mutex = CreateMutex(NULL, 0, NULL);
    if(!ctx->mutex) {
        av_log(s, AV_LOG_ERROR, "Could not create Mutex.\n" );
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        goto fail_io;
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    }
    ctx->event = CreateEvent(NULL, 1, 0, NULL);
    if(!ctx->event) {
        av_log(s, AV_LOG_ERROR, "Could not create Event.\n" );
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        goto fail_io;
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    }

    ret = SendMessage(ctx->hwnd, WM_CAP_SEQUENCE_NOFILE, 0, 0);
    if(!ret) {
        av_log(s, AV_LOG_ERROR, "Could not start capture sequence.\n" );
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        goto fail_io;
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    }

    return 0;
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fail_bi:
    av_free(bi);

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fail_io:
    vfw_read_close(s);
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    return AVERROR(EIO);
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}

static int vfw_read_packet(AVFormatContext *s, AVPacket *pkt)
{
    struct vfw_ctx *ctx = s->priv_data;
    AVPacketList *pktl = NULL;

    while(!pktl) {
        WaitForSingleObject(ctx->mutex, INFINITE);
        pktl = ctx->pktl;
        if(ctx->pktl) {
            *pkt = ctx->pktl->pkt;
            ctx->pktl = ctx->pktl->next;
            av_free(pktl);
        }
        ResetEvent(ctx->event);
        ReleaseMutex(ctx->mutex);
        if(!pktl) {
            if(s->flags & AVFMT_FLAG_NONBLOCK) {
                return AVERROR(EAGAIN);
            } else {
                WaitForSingleObject(ctx->event, INFINITE);
            }
        }
    }

    ctx->curbufsize -= pkt->size;

    return pkt->size;
}

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#define OFFSET(x) offsetof(struct vfw_ctx, x)
#define DEC AV_OPT_FLAG_DECODING_PARAM
static const AVOption options[] = {
    { "video_size", "A string describing frame size, such as 640x480 or hd720.", OFFSET(video_size), FF_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
    { NULL },
};

static const AVClass vfw_class = {
    .class_name = "VFW indev",
    .item_name  = av_default_item_name,
    .option     = options,
    .version    = LIBAVUTIL_VERSION_INT,
};

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AVInputFormat ff_vfwcap_demuxer = {
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    "vfwcap",
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    NULL_IF_CONFIG_SMALL("VFW video capture"),
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    sizeof(struct vfw_ctx),
    NULL,
    vfw_read_header,
    vfw_read_packet,
    vfw_read_close,
    .flags = AVFMT_NOFILE,
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    .priv_class = &vfw_class,
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};