[libav.git] / libavdevice / vfwcap.c

/*
 * VFW capture interface
 * Copyright (c) 2006-2008 Ramiro Polla
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg 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.
 *
 * FFmpeg 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 FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include "libavformat/avformat.h"
#include <windows.h>
#include <vfw.h>

//#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 {
    HWND hwnd;
    HANDLE mutex;
    HANDLE event;
    AVPacketList *pktl;
    unsigned int curbufsize;
    unsigned int frame_num;
};

static enum PixelFormat vfw_pixfmt(DWORD biCompression, WORD biBitCount)
{
    switch(biCompression) {
    case MKTAG('U', 'Y', 'V', 'Y'):
        return PIX_FMT_UYVY422;
    case MKTAG('Y', 'U', 'Y', '2'):
        return PIX_FMT_YUYV422;
    case MKTAG('I', '4', '2', '0'):
        return PIX_FMT_YUV420P;
    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;
        }
    }
    return PIX_FMT_NONE;
}

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

#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");
}

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

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

    return 0;
}

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

    s = (AVFormatContext *) GetWindowLongPtr(hwnd, GWLP_USERDATA);
    ctx = s->priv_data;

    dump_videohdr(s, vdhdr);

    if(shall_we_drop(s))
        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;
}

static int vfw_read_close(AVFormatContext *s)
{
    struct vfw_ctx *ctx = s->priv_data;
    AVPacketList *pktl;

    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);

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

    return 0;
}

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 width;
    int height;
    int ret;

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

    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");
        return AVERROR(EIO);
    }

    /* 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");
        goto fail_io;
    }

    SetWindowLongPtr(ctx->hwnd, GWLP_USERDATA, (LONG_PTR) s);

    st = av_new_stream(s, 0);
    if(!st) {
        vfw_read_close(s);
        return AVERROR(ENOMEM);
    }

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

    dump_bih(s, &bi->bmiHeader);

    width  = ap->width  ? ap->width  : bi->bmiHeader.biWidth ;
    height = ap->height ? ap->height : bi->bmiHeader.biHeight;
    bi->bmiHeader.biWidth  = width ;
    bi->bmiHeader.biHeight = height;

    if (0) {
        /* 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);
    }

    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");
        goto fail_bi;
    }

    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);
    if(!ret)
        goto fail_io;

    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);
    if(!ret)
        goto fail_io;

    codec = st->codec;
    codec->time_base = ap->time_base;
    codec->codec_type = AVMEDIA_TYPE_VIDEO;
    codec->width = width;
    codec->height = height;
    codec->pix_fmt = vfw_pixfmt(biCompression, biBitCount);
    if(codec->pix_fmt == PIX_FMT_NONE) {
        codec->codec_id = vfw_codecid(biCompression);
        if(codec->codec_id == CODEC_ID_NONE) {
            av_log(s, AV_LOG_ERROR, "Unknown compression type. "
                             "Please report verbose (-v 9) debug information.\n");
            vfw_read_close(s);
            return AVERROR_PATCHWELCOME;
        }
        codec->bits_per_coded_sample = biBitCount;
    } else {
        codec->codec_id = CODEC_ID_RAWVIDEO;
        if(biCompression == BI_RGB) {
            codec->bits_per_coded_sample = biBitCount;
            codec->extradata = av_malloc(9 + FF_INPUT_BUFFER_PADDING_SIZE);
            if (codec->extradata) {
                codec->extradata_size = 9;
                memcpy(codec->extradata, "BottomUp", 9);
            }
        }
    }

    av_set_pts_info(st, 32, 1, 1000);

    ctx->mutex = CreateMutex(NULL, 0, NULL);
    if(!ctx->mutex) {
        av_log(s, AV_LOG_ERROR, "Could not create Mutex.\n" );
        goto fail_io;
    }
    ctx->event = CreateEvent(NULL, 1, 0, NULL);
    if(!ctx->event) {
        av_log(s, AV_LOG_ERROR, "Could not create Event.\n" );
        goto fail_io;
    }

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

    return 0;

fail_bi:
    av_free(bi);

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

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;
}

AVInputFormat vfwcap_demuxer = {
    "vfwcap",
    NULL_IF_CONFIG_SMALL("VFW video capture"),
    sizeof(struct vfw_ctx),
    NULL,
    vfw_read_header,
    vfw_read_packet,
    vfw_read_close,
    .flags = AVFMT_NOFILE,
};
Commit	Line	Data
c2345207 RP	1	/*
c2345207 RP	2	* VFW capture interface
406792e7	3	* Copyright (c) 2006-2008 Ramiro Polla
c2345207 RP	4	*
	5	* This file is part of FFmpeg.
	6	*
	7	* FFmpeg is free software; you can redistribute it and/or
	8	* modify it under the terms of the GNU Lesser General Public
	9	* License as published by the Free Software Foundation; either
	10	* version 2.1 of the License, or (at your option) any later version.
	11	*
	12	* FFmpeg is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	15	* Lesser General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU Lesser General Public
	18	* License along with FFmpeg; if not, write to the Free Software
	19	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
	20	*/
	21
245976da	22	#include "libavformat/avformat.h"
c2345207	23	#include <windows.h>
420755dd	24	#include <vfw.h>
c2345207 RP	25
	26	//#define DEBUG_VFW
	27
	28	/* Defines for VFW missing from MinGW.
	29	* Remove this when MinGW incorporates them. */
c2345207 RP	30	#define HWND_MESSAGE ((HWND)-3)
	31
	32	#define BI_RGB 0
	33
c2345207 RP	34	/* End of missing MinGW defines */
	35
	36	struct vfw_ctx {
	37	HWND hwnd;
	38	HANDLE mutex;
	39	HANDLE event;
	40	AVPacketList *pktl;
c2345207 RP	41	unsigned int curbufsize;
	42	unsigned int frame_num;
	43	};
	44
	45	static enum PixelFormat vfw_pixfmt(DWORD biCompression, WORD biBitCount)
	46	{
	47	switch(biCompression) {
e24080f0 RP	48	case MKTAG('U', 'Y', 'V', 'Y'):
e24080f0 RP	49	return PIX_FMT_UYVY422;
c2345207 RP	50	case MKTAG('Y', 'U', 'Y', '2'):
c2345207 RP	51	return PIX_FMT_YUYV422;
23ef6da8 RP	52	case MKTAG('I', '4', '2', '0'):
23ef6da8 RP	53	return PIX_FMT_YUV420P;
c2345207 RP	54	case BI_RGB:
	55	switch(biBitCount) { /* 1-8 are untested */
	56	case 1:
	57	return PIX_FMT_MONOWHITE;
	58	case 4:
	59	return PIX_FMT_RGB4;
	60	case 8:
	61	return PIX_FMT_RGB8;
	62	case 16:
	63	return PIX_FMT_RGB555;
	64	case 24:
	65	return PIX_FMT_BGR24;
	66	case 32:
	67	return PIX_FMT_RGB32;
	68	}
	69	}
d40b45e8	70	return PIX_FMT_NONE;
c2345207 RP	71	}
c2345207 RP	72
1c0b9215 RP	73	static enum CodecID vfw_codecid(DWORD biCompression)
	74	{
	75	switch(biCompression) {
	76	case MKTAG('d', 'v', 's', 'd'):
	77	return CODEC_ID_DVVIDEO;
d7a4961e NT	78	case MKTAG('M', 'J', 'P', 'G'):
	79	case MKTAG('m', 'j', 'p', 'g'):
	80	return CODEC_ID_MJPEG;
1c0b9215 RP	81	}
	82	return CODEC_ID_NONE;
	83	}
	84
c2345207 RP	85	#define dstruct(pctx, sname, var, type) \
	86	av_log(pctx, AV_LOG_DEBUG, #var":\t%"type"\n", sname->var)
	87
	88	static void dump_captureparms(AVFormatContext s, CAPTUREPARMS cparms)
	89	{
	90	av_log(s, AV_LOG_DEBUG, "CAPTUREPARMS\n");
	91	dstruct(s, cparms, dwRequestMicroSecPerFrame, "lu");
	92	dstruct(s, cparms, fMakeUserHitOKToCapture, "d");
	93	dstruct(s, cparms, wPercentDropForError, "u");
	94	dstruct(s, cparms, fYield, "d");
	95	dstruct(s, cparms, dwIndexSize, "lu");
	96	dstruct(s, cparms, wChunkGranularity, "u");
	97	dstruct(s, cparms, fUsingDOSMemory, "d");
	98	dstruct(s, cparms, wNumVideoRequested, "u");
	99	dstruct(s, cparms, fCaptureAudio, "d");
	100	dstruct(s, cparms, wNumAudioRequested, "u");
	101	dstruct(s, cparms, vKeyAbort, "u");
	102	dstruct(s, cparms, fAbortLeftMouse, "d");
	103	dstruct(s, cparms, fAbortRightMouse, "d");
	104	dstruct(s, cparms, fLimitEnabled, "d");
	105	dstruct(s, cparms, wTimeLimit, "u");
	106	dstruct(s, cparms, fMCIControl, "d");
	107	dstruct(s, cparms, fStepMCIDevice, "d");
	108	dstruct(s, cparms, dwMCIStartTime, "lu");
	109	dstruct(s, cparms, dwMCIStopTime, "lu");
	110	dstruct(s, cparms, fStepCaptureAt2x, "d");
	111	dstruct(s, cparms, wStepCaptureAverageFrames, "u");
	112	dstruct(s, cparms, dwAudioBufferSize, "lu");
	113	dstruct(s, cparms, fDisableWriteCache, "d");
	114	dstruct(s, cparms, AVStreamMaster, "u");
	115	}
	116
	117	static void dump_videohdr(AVFormatContext s, VIDEOHDR vhdr)
	118	{
	119	#ifdef DEBUG_VFW
	120	av_log(s, AV_LOG_DEBUG, "VIDEOHDR\n");
	121	dstruct(s, vhdr, lpData, "p");
	122	dstruct(s, vhdr, dwBufferLength, "lu");
	123	dstruct(s, vhdr, dwBytesUsed, "lu");
	124	dstruct(s, vhdr, dwTimeCaptured, "lu");
	125	dstruct(s, vhdr, dwUser, "lu");
	126	dstruct(s, vhdr, dwFlags, "lu");
	127	dstruct(s, vhdr, dwReserved[0], "lu");
	128	dstruct(s, vhdr, dwReserved[1], "lu");
	129	dstruct(s, vhdr, dwReserved[2], "lu");
	130	dstruct(s, vhdr, dwReserved[3], "lu");
	131	#endif
	132	}
	133
	134	static void dump_bih(AVFormatContext s, BITMAPINFOHEADER bih)
	135	{
	136	av_log(s, AV_LOG_DEBUG, "BITMAPINFOHEADER\n");
	137	dstruct(s, bih, biSize, "lu");
	138	dstruct(s, bih, biWidth, "ld");
	139	dstruct(s, bih, biHeight, "ld");
	140	dstruct(s, bih, biPlanes, "d");
	141	dstruct(s, bih, biBitCount, "d");
	142	dstruct(s, bih, biCompression, "lu");
	143	av_log(s, AV_LOG_DEBUG, " biCompression:\t\"%.4s\"\n",
	144	(char*) &bih->biCompression);
	145	dstruct(s, bih, biSizeImage, "lu");
	146	dstruct(s, bih, biXPelsPerMeter, "lu");
	147	dstruct(s, bih, biYPelsPerMeter, "lu");
	148	dstruct(s, bih, biClrUsed, "lu");
149	dstruct(s, bih, biClrImportant, "lu");
150	}
151
ce03ed4d	152	static int shall_we_drop(AVFormatContext *s)
c2345207	153	{
ce03ed4d	154	struct vfw_ctx *ctx = s->priv_data;
c2345207	155	const uint8_t dropscore[] = {62, 75, 87, 100};
37d3e066	156	const int ndropscores = FF_ARRAY_ELEMS(dropscore);
c2345207 RP	157	unsigned int buffer_fullness = (ctx->curbufsize*100)/s->max_picture_buffer;
c2345207 RP	158
d76c3e07	159	if(dropscore[++ctx->frame_num%ndropscores] <= buffer_fullness) {
ce03ed4d	160	av_log(s, AV_LOG_ERROR,
c2345207 RP	161	"real-time buffer %d%% full! frame dropped!\n", buffer_fullness);
	162	return 1;
	163	}
	164
	165	return 0;
	166	}
	167
	168	static LRESULT CALLBACK videostream_cb(HWND hwnd, LPVIDEOHDR vdhdr)
	169	{
ce03ed4d	170	AVFormatContext *s;
c2345207 RP	171	struct vfw_ctx *ctx;
	172	AVPacketList *ppktl, pktl_next;
	173
ce03ed4d RP	174	s = (AVFormatContext *) GetWindowLongPtr(hwnd, GWLP_USERDATA);
ce03ed4d RP	175	ctx = s->priv_data;
c2345207	176
ce03ed4d	177	dump_videohdr(s, vdhdr);
c2345207	178
ce03ed4d	179	if(shall_we_drop(s))
c2345207 RP	180	return FALSE;
	181
	182	WaitForSingleObject(ctx->mutex, INFINITE);
	183
	184	pktl_next = av_mallocz(sizeof(AVPacketList));
	185	if(!pktl_next)
	186	goto fail;
	187
	188	if(av_new_packet(&pktl_next->pkt, vdhdr->dwBytesUsed) < 0) {
	189	av_free(pktl_next);
	190	goto fail;
	191	}
	192
	193	pktl_next->pkt.pts = vdhdr->dwTimeCaptured;
	194	memcpy(pktl_next->pkt.data, vdhdr->lpData, vdhdr->dwBytesUsed);
	195
	196	for(ppktl = &ctx->pktl ; ppktl ; ppktl = &(ppktl)->next);
	197	*ppktl = pktl_next;
	198
	199	ctx->curbufsize += vdhdr->dwBytesUsed;
	200
	201	SetEvent(ctx->event);
	202	ReleaseMutex(ctx->mutex);
	203
	204	return TRUE;
	205	fail:
	206	ReleaseMutex(ctx->mutex);
	207	return FALSE;
	208	}
	209
c959c6ee DB	210	static int vfw_read_close(AVFormatContext *s)
	211	{
	212	struct vfw_ctx *ctx = s->priv_data;
ad8eede7	213	AVPacketList *pktl;
c959c6ee DB	214
	215	if(ctx->hwnd) {
	216	SendMessage(ctx->hwnd, WM_CAP_SET_CALLBACK_VIDEOSTREAM, 0, 0);
	217	SendMessage(ctx->hwnd, WM_CAP_DRIVER_DISCONNECT, 0, 0);
	218	DestroyWindow(ctx->hwnd);
	219	}
	220	if(ctx->mutex)
	221	CloseHandle(ctx->mutex);
	222	if(ctx->event)
	223	CloseHandle(ctx->event);
	224
ad8eede7 RP	225	pktl = ctx->pktl;
	226	while (pktl) {
	227	AVPacketList *next = pktl->next;
	228	av_destruct_packet(&pktl->pkt);
	229	av_free(pktl);
	230	pktl = next;
	231	}
	232
c959c6ee DB	233	return 0;
c959c6ee DB	234	}
c2345207 RP	235
	236	static int vfw_read_header(AVFormatContext s, AVFormatParameters ap)
	237	{
	238	struct vfw_ctx *ctx = s->priv_data;
	239	AVCodecContext *codec;
	240	AVStream *st;
	241	int devnum;
	242	int bisize;
	243	BITMAPINFO *bi;
	244	CAPTUREPARMS cparms;
	245	DWORD biCompression;
	246	WORD biBitCount;
	247	int width;
	248	int height;
	249	int ret;
	250
	251	if(!ap->time_base.den) {
	252	av_log(s, AV_LOG_ERROR, "A time base must be specified.\n");
5ae092ee	253	return AVERROR(EIO);
c2345207 RP	254	}
c2345207 RP	255
c2345207 RP	256	ctx->hwnd = capCreateCaptureWindow(NULL, 0, 0, 0, 0, 0, HWND_MESSAGE, 0);
	257	if(!ctx->hwnd) {
	258	av_log(s, AV_LOG_ERROR, "Could not create capture window.\n");
5ae092ee	259	return AVERROR(EIO);
c2345207 RP	260	}
	261
	262	/* If atoi fails, devnum==0 and the default device is used */
	263	devnum = atoi(s->filename);
	264
	265	ret = SendMessage(ctx->hwnd, WM_CAP_DRIVER_CONNECT, devnum, 0);
	266	if(!ret) {
	267	av_log(s, AV_LOG_ERROR, "Could not connect to device.\n");
	268	DestroyWindow(ctx->hwnd);
	269	return AVERROR(ENODEV);
	270	}
	271
	272	SendMessage(ctx->hwnd, WM_CAP_SET_OVERLAY, 0, 0);
	273	SendMessage(ctx->hwnd, WM_CAP_SET_PREVIEW, 0, 0);
	274
	275	ret = SendMessage(ctx->hwnd, WM_CAP_SET_CALLBACK_VIDEOSTREAM, 0,
	276	(LPARAM) videostream_cb);
	277	if(!ret) {
	278	av_log(s, AV_LOG_ERROR, "Could not set video stream callback.\n");
76c2662b	279	goto fail_io;
c2345207 RP	280	}
c2345207 RP	281
ce03ed4d	282	SetWindowLongPtr(ctx->hwnd, GWLP_USERDATA, (LONG_PTR) s);
c2345207 RP	283
	284	st = av_new_stream(s, 0);
	285	if(!st) {
	286	vfw_read_close(s);
2874c81c	287	return AVERROR(ENOMEM);
c2345207 RP	288	}
	289
	290	/* Set video format */
	291	bisize = SendMessage(ctx->hwnd, WM_CAP_GET_VIDEOFORMAT, 0, 0);
e4d286f1	292	if(!bisize)
76c2662b	293	goto fail_io;
c2345207 RP	294	bi = av_malloc(bisize);
	295	if(!bi) {
	296	vfw_read_close(s);
2874c81c	297	return AVERROR(ENOMEM);
c2345207 RP	298	}
c2345207 RP	299	ret = SendMessage(ctx->hwnd, WM_CAP_GET_VIDEOFORMAT, bisize, (LPARAM) bi);
e4d286f1	300	if(!ret)
e110f486	301	goto fail_bi;
c2345207 RP	302
	303	dump_bih(s, &bi->bmiHeader);
	304
	305	width = ap->width ? ap->width : bi->bmiHeader.biWidth ;
	306	height = ap->height ? ap->height : bi->bmiHeader.biHeight;
	307	bi->bmiHeader.biWidth = width ;
	308	bi->bmiHeader.biHeight = height;
	309
a9decf00	310	if (0) {
315fa33f RP	311	/* For testing yet unsupported compressions
	312	* Copy these values from user-supplied verbose information */
	313	bi->bmiHeader.biWidth = 320;
	314	bi->bmiHeader.biHeight = 240;
	315	bi->bmiHeader.biPlanes = 1;
	316	bi->bmiHeader.biBitCount = 12;
	317	bi->bmiHeader.biCompression = MKTAG('I','4','2','0');
	318	bi->bmiHeader.biSizeImage = 115200;
	319	dump_bih(s, &bi->bmiHeader);
a9decf00	320	}
cada0327	321
c2345207 RP	322	ret = SendMessage(ctx->hwnd, WM_CAP_SET_VIDEOFORMAT, bisize, (LPARAM) bi);
	323	if(!ret) {
	324	av_log(s, AV_LOG_ERROR, "Could not set Video Format.\n");
e110f486	325	goto fail_bi;
c2345207 RP	326	}
	327
	328	biCompression = bi->bmiHeader.biCompression;
	329	biBitCount = bi->bmiHeader.biBitCount;
	330
	331	av_free(bi);
	332
	333	/* Set sequence setup */
	334	ret = SendMessage(ctx->hwnd, WM_CAP_GET_SEQUENCE_SETUP, sizeof(cparms),
	335	(LPARAM) &cparms);
e4d286f1	336	if(!ret)
76c2662b	337	goto fail_io;
c2345207 RP	338
	339	dump_captureparms(s, &cparms);
	340
	341	cparms.fYield = 1; // Spawn a background thread
	342	cparms.dwRequestMicroSecPerFrame =
	343	(ap->time_base.num*1000000) / ap->time_base.den;
	344	cparms.fAbortLeftMouse = 0;
	345	cparms.fAbortRightMouse = 0;
	346	cparms.fCaptureAudio = 0;
	347	cparms.vKeyAbort = 0;
	348
	349	ret = SendMessage(ctx->hwnd, WM_CAP_SET_SEQUENCE_SETUP, sizeof(cparms),
	350	(LPARAM) &cparms);
e4d286f1	351	if(!ret)
76c2662b	352	goto fail_io;
c2345207 RP	353
	354	codec = st->codec;
	355	codec->time_base = ap->time_base;
72415b2a	356	codec->codec_type = AVMEDIA_TYPE_VIDEO;
c2345207 RP	357	codec->width = width;
c2345207 RP	358	codec->height = height;
c2345207	359	codec->pix_fmt = vfw_pixfmt(biCompression, biBitCount);
d40b45e8	360	if(codec->pix_fmt == PIX_FMT_NONE) {
1c0b9215 RP	361	codec->codec_id = vfw_codecid(biCompression);
1c0b9215 RP	362	if(codec->codec_id == CODEC_ID_NONE) {
155b0f00 RP	363	av_log(s, AV_LOG_ERROR, "Unknown compression type. "
	364	"Please report verbose (-v 9) debug information.\n");
	365	vfw_read_close(s);
	366	return AVERROR_PATCHWELCOME;
1c0b9215 RP	367	}
1c0b9215 RP	368	codec->bits_per_coded_sample = biBitCount;
155b0f00 RP	369	} else {
155b0f00 RP	370	codec->codec_id = CODEC_ID_RAWVIDEO;
faa2989e	371	if(biCompression == BI_RGB) {
155b0f00	372	codec->bits_per_coded_sample = biBitCount;
faa2989e RP	373	codec->extradata = av_malloc(9 + FF_INPUT_BUFFER_PADDING_SIZE);
	374	if (codec->extradata) {
	375	codec->extradata_size = 9;
	376	memcpy(codec->extradata, "BottomUp", 9);
	377	}
	378	}
1c0b9215	379	}
42477de5 RP	380
42477de5 RP	381	av_set_pts_info(st, 32, 1, 1000);
c2345207 RP	382
	383	ctx->mutex = CreateMutex(NULL, 0, NULL);
	384	if(!ctx->mutex) {
	385	av_log(s, AV_LOG_ERROR, "Could not create Mutex.\n" );
76c2662b	386	goto fail_io;
c2345207 RP	387	}
	388	ctx->event = CreateEvent(NULL, 1, 0, NULL);
	389	if(!ctx->event) {
	390	av_log(s, AV_LOG_ERROR, "Could not create Event.\n" );
76c2662b	391	goto fail_io;
c2345207 RP	392	}
	393
	394	ret = SendMessage(ctx->hwnd, WM_CAP_SEQUENCE_NOFILE, 0, 0);
	395	if(!ret) {
	396	av_log(s, AV_LOG_ERROR, "Could not start capture sequence.\n" );
76c2662b	397	goto fail_io;
c2345207 RP	398	}
	399
	400	return 0;
76c2662b	401
e110f486 RP	402	fail_bi:
	403	av_free(bi);
	404
76c2662b RP	405	fail_io:
76c2662b RP	406	vfw_read_close(s);
5ae092ee	407	return AVERROR(EIO);
c2345207 RP	408	}
	409
	410	static int vfw_read_packet(AVFormatContext s, AVPacket pkt)
	411	{
	412	struct vfw_ctx *ctx = s->priv_data;
	413	AVPacketList *pktl = NULL;
	414
	415	while(!pktl) {
	416	WaitForSingleObject(ctx->mutex, INFINITE);
	417	pktl = ctx->pktl;
	418	if(ctx->pktl) {
	419	*pkt = ctx->pktl->pkt;
	420	ctx->pktl = ctx->pktl->next;
	421	av_free(pktl);
	422	}
	423	ResetEvent(ctx->event);
	424	ReleaseMutex(ctx->mutex);
	425	if(!pktl) {
	426	if(s->flags & AVFMT_FLAG_NONBLOCK) {
	427	return AVERROR(EAGAIN);
	428	} else {
	429	WaitForSingleObject(ctx->event, INFINITE);
	430	}
	431	}
	432	}
	433
	434	ctx->curbufsize -= pkt->size;
	435
	436	return pkt->size;
	437	}
	438
c2345207 RP	439	AVInputFormat vfwcap_demuxer = {
c2345207 RP	440	"vfwcap",
bde15e74	441	NULL_IF_CONFIG_SMALL("VFW video capture"),
c2345207 RP	442	sizeof(struct vfw_ctx),
	443	NULL,
	444	vfw_read_header,
	445	vfw_read_packet,
	446	vfw_read_close,
	447	.flags = AVFMT_NOFILE,
	448	};