[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 <vfw.h>
#include <windows.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;
    AVFormatContext *s;
    unsigned int curbufsize;
    unsigned int frame_num;
};

static enum PixelFormat vfw_pixfmt(DWORD biCompression, WORD biBitCount)
{
    switch(biCompression) {
    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;
    }
    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(struct vfw_ctx *ctx)
{
    AVFormatContext *s = ctx->s;
    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(ctx->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)
{
    struct vfw_ctx *ctx;
    AVPacketList **ppktl, *pktl_next;

    ctx = (struct vfw_ctx *) GetWindowLongPtr(hwnd, GWLP_USERDATA);

    dump_videohdr(ctx->s, vdhdr);

    if(shall_we_drop(ctx))
        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);

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_IO;
    }

    ctx->s = s;

    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_IO;
    }

    /* 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) ctx);

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

    /* 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_NOMEM;
    }
    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);
#endif

    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 = CODEC_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;
    }

    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_IO;
}

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;
}

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

    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);

    return 0;
}

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 RP	23	#include <vfw.h>
	24	#include <windows.h>
	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;
	41	AVFormatContext *s;
	42	unsigned int curbufsize;
	43	unsigned int frame_num;
	44	};
	45
	46	static enum PixelFormat vfw_pixfmt(DWORD biCompression, WORD biBitCount)
	47	{
	48	switch(biCompression) {
	49	case MKTAG('Y', 'U', 'Y', '2'):
	50	return PIX_FMT_YUYV422;
23ef6da8 RP	51	case MKTAG('I', '4', '2', '0'):
23ef6da8 RP	52	return PIX_FMT_YUV420P;
c2345207 RP	53	case BI_RGB:
	54	switch(biBitCount) { /* 1-8 are untested */
	55	case 1:
	56	return PIX_FMT_MONOWHITE;
	57	case 4:
	58	return PIX_FMT_RGB4;
	59	case 8:
	60	return PIX_FMT_RGB8;
	61	case 16:
	62	return PIX_FMT_RGB555;
	63	case 24:
	64	return PIX_FMT_BGR24;
	65	case 32:
	66	return PIX_FMT_RGB32;
	67	}
	68	}
d40b45e8	69	return PIX_FMT_NONE;
c2345207 RP	70	}
c2345207 RP	71
1c0b9215 RP	72	static enum CodecID vfw_codecid(DWORD biCompression)
	73	{
	74	switch(biCompression) {
	75	case MKTAG('d', 'v', 's', 'd'):
	76	return CODEC_ID_DVVIDEO;
	77	}
	78	return CODEC_ID_NONE;
	79	}
	80
c2345207 RP	81	#define dstruct(pctx, sname, var, type) \
	82	av_log(pctx, AV_LOG_DEBUG, #var":\t%"type"\n", sname->var)
	83
	84	static void dump_captureparms(AVFormatContext s, CAPTUREPARMS cparms)
	85	{
	86	av_log(s, AV_LOG_DEBUG, "CAPTUREPARMS\n");
	87	dstruct(s, cparms, dwRequestMicroSecPerFrame, "lu");
	88	dstruct(s, cparms, fMakeUserHitOKToCapture, "d");
	89	dstruct(s, cparms, wPercentDropForError, "u");
	90	dstruct(s, cparms, fYield, "d");
	91	dstruct(s, cparms, dwIndexSize, "lu");
	92	dstruct(s, cparms, wChunkGranularity, "u");
	93	dstruct(s, cparms, fUsingDOSMemory, "d");
	94	dstruct(s, cparms, wNumVideoRequested, "u");
	95	dstruct(s, cparms, fCaptureAudio, "d");
	96	dstruct(s, cparms, wNumAudioRequested, "u");
	97	dstruct(s, cparms, vKeyAbort, "u");
	98	dstruct(s, cparms, fAbortLeftMouse, "d");
	99	dstruct(s, cparms, fAbortRightMouse, "d");
	100	dstruct(s, cparms, fLimitEnabled, "d");
	101	dstruct(s, cparms, wTimeLimit, "u");
	102	dstruct(s, cparms, fMCIControl, "d");
	103	dstruct(s, cparms, fStepMCIDevice, "d");
	104	dstruct(s, cparms, dwMCIStartTime, "lu");
	105	dstruct(s, cparms, dwMCIStopTime, "lu");
	106	dstruct(s, cparms, fStepCaptureAt2x, "d");
	107	dstruct(s, cparms, wStepCaptureAverageFrames, "u");
	108	dstruct(s, cparms, dwAudioBufferSize, "lu");
	109	dstruct(s, cparms, fDisableWriteCache, "d");
	110	dstruct(s, cparms, AVStreamMaster, "u");
	111	}
	112
	113	static void dump_videohdr(AVFormatContext s, VIDEOHDR vhdr)
	114	{
	115	#ifdef DEBUG_VFW
	116	av_log(s, AV_LOG_DEBUG, "VIDEOHDR\n");
	117	dstruct(s, vhdr, lpData, "p");
	118	dstruct(s, vhdr, dwBufferLength, "lu");
	119	dstruct(s, vhdr, dwBytesUsed, "lu");
	120	dstruct(s, vhdr, dwTimeCaptured, "lu");
	121	dstruct(s, vhdr, dwUser, "lu");
	122	dstruct(s, vhdr, dwFlags, "lu");
	123	dstruct(s, vhdr, dwReserved[0], "lu");
	124	dstruct(s, vhdr, dwReserved[1], "lu");
	125	dstruct(s, vhdr, dwReserved[2], "lu");
	126	dstruct(s, vhdr, dwReserved[3], "lu");
	127	#endif
	128	}
	129
	130	static void dump_bih(AVFormatContext s, BITMAPINFOHEADER bih)
	131	{
	132	av_log(s, AV_LOG_DEBUG, "BITMAPINFOHEADER\n");
	133	dstruct(s, bih, biSize, "lu");
	134	dstruct(s, bih, biWidth, "ld");
	135	dstruct(s, bih, biHeight, "ld");
	136	dstruct(s, bih, biPlanes, "d");
	137	dstruct(s, bih, biBitCount, "d");
	138	dstruct(s, bih, biCompression, "lu");
	139	av_log(s, AV_LOG_DEBUG, " biCompression:\t\"%.4s\"\n",
	140	(char*) &bih->biCompression);
	141	dstruct(s, bih, biSizeImage, "lu");
	142	dstruct(s, bih, biXPelsPerMeter, "lu");
	143	dstruct(s, bih, biYPelsPerMeter, "lu");
	144	dstruct(s, bih, biClrUsed, "lu");
145	dstruct(s, bih, biClrImportant, "lu");
146	}
147
148	static int shall_we_drop(struct vfw_ctx *ctx)
149	{
150	AVFormatContext *s = ctx->s;
151	const uint8_t dropscore[] = {62, 75, 87, 100};
37d3e066	152	const int ndropscores = FF_ARRAY_ELEMS(dropscore);
c2345207 RP	153	unsigned int buffer_fullness = (ctx->curbufsize*100)/s->max_picture_buffer;
c2345207 RP	154
d76c3e07	155	if(dropscore[++ctx->frame_num%ndropscores] <= buffer_fullness) {
c2345207 RP	156	av_log(ctx->s, AV_LOG_ERROR,
	157	"real-time buffer %d%% full! frame dropped!\n", buffer_fullness);
	158	return 1;
	159	}
	160
	161	return 0;
	162	}
	163
	164	static LRESULT CALLBACK videostream_cb(HWND hwnd, LPVIDEOHDR vdhdr)
	165	{
	166	struct vfw_ctx *ctx;
	167	AVPacketList *ppktl, pktl_next;
	168
	169	ctx = (struct vfw_ctx *) GetWindowLongPtr(hwnd, GWLP_USERDATA);
	170
	171	dump_videohdr(ctx->s, vdhdr);
	172
	173	if(shall_we_drop(ctx))
	174	return FALSE;
	175
	176	WaitForSingleObject(ctx->mutex, INFINITE);
	177
	178	pktl_next = av_mallocz(sizeof(AVPacketList));
	179	if(!pktl_next)
	180	goto fail;
	181
	182	if(av_new_packet(&pktl_next->pkt, vdhdr->dwBytesUsed) < 0) {
	183	av_free(pktl_next);
	184	goto fail;
	185	}
	186
	187	pktl_next->pkt.pts = vdhdr->dwTimeCaptured;
	188	memcpy(pktl_next->pkt.data, vdhdr->lpData, vdhdr->dwBytesUsed);
	189
	190	for(ppktl = &ctx->pktl ; ppktl ; ppktl = &(ppktl)->next);
	191	*ppktl = pktl_next;
	192
	193	ctx->curbufsize += vdhdr->dwBytesUsed;
	194
	195	SetEvent(ctx->event);
	196	ReleaseMutex(ctx->mutex);
	197
	198	return TRUE;
	199	fail:
	200	ReleaseMutex(ctx->mutex);
	201	return FALSE;
	202	}
	203
	204	static int vfw_read_close(AVFormatContext *s);
	205
	206	static int vfw_read_header(AVFormatContext s, AVFormatParameters ap)
	207	{
	208	struct vfw_ctx *ctx = s->priv_data;
	209	AVCodecContext *codec;
	210	AVStream *st;
	211	int devnum;
	212	int bisize;
	213	BITMAPINFO *bi;
	214	CAPTUREPARMS cparms;
	215	DWORD biCompression;
	216	WORD biBitCount;
	217	int width;
	218	int height;
	219	int ret;
220
221	if(!ap->time_base.den) {
222	av_log(s, AV_LOG_ERROR, "A time base must be specified.\n");
223	return AVERROR_IO;
224	}
225
226	ctx->s = s;
227
228	ctx->hwnd = capCreateCaptureWindow(NULL, 0, 0, 0, 0, 0, HWND_MESSAGE, 0);
229	if(!ctx->hwnd) {
230	av_log(s, AV_LOG_ERROR, "Could not create capture window.\n");
231	return AVERROR_IO;
232	}
233
234	/* If atoi fails, devnum==0 and the default device is used */
235	devnum = atoi(s->filename);
236
237	ret = SendMessage(ctx->hwnd, WM_CAP_DRIVER_CONNECT, devnum, 0);
238	if(!ret) {
239	av_log(s, AV_LOG_ERROR, "Could not connect to device.\n");
240	DestroyWindow(ctx->hwnd);
241	return AVERROR(ENODEV);
242	}
243
244	SendMessage(ctx->hwnd, WM_CAP_SET_OVERLAY, 0, 0);
245	SendMessage(ctx->hwnd, WM_CAP_SET_PREVIEW, 0, 0);
246
247	ret = SendMessage(ctx->hwnd, WM_CAP_SET_CALLBACK_VIDEOSTREAM, 0,
248	(LPARAM) videostream_cb);
249	if(!ret) {
250	av_log(s, AV_LOG_ERROR, "Could not set video stream callback.\n");
76c2662b	251	goto fail_io;
c2345207 RP	252	}
	253
	254	SetWindowLongPtr(ctx->hwnd, GWLP_USERDATA, (LONG_PTR) ctx);
	255
	256	st = av_new_stream(s, 0);
	257	if(!st) {
	258	vfw_read_close(s);
	259	return AVERROR_NOMEM;
	260	}
	261
	262	/* Set video format */
	263	bisize = SendMessage(ctx->hwnd, WM_CAP_GET_VIDEOFORMAT, 0, 0);
e4d286f1	264	if(!bisize)
76c2662b	265	goto fail_io;
c2345207 RP	266	bi = av_malloc(bisize);
	267	if(!bi) {
	268	vfw_read_close(s);
	269	return AVERROR_NOMEM;
	270	}
	271	ret = SendMessage(ctx->hwnd, WM_CAP_GET_VIDEOFORMAT, bisize, (LPARAM) bi);
e4d286f1	272	if(!ret)
e110f486	273	goto fail_bi;
c2345207 RP	274
	275	dump_bih(s, &bi->bmiHeader);
	276
	277	width = ap->width ? ap->width : bi->bmiHeader.biWidth ;
	278	height = ap->height ? ap->height : bi->bmiHeader.biHeight;
	279	bi->bmiHeader.biWidth = width ;
	280	bi->bmiHeader.biHeight = height;
	281
cada0327 RP	282	#if 0
cada0327 RP	283	/* For testing yet unsupported compressions
4b1131a0	284	* Copy these values from user-supplied verbose information */
cada0327 RP	285	bi->bmiHeader.biWidth = 320;
	286	bi->bmiHeader.biHeight = 240;
	287	bi->bmiHeader.biPlanes = 1;
	288	bi->bmiHeader.biBitCount = 12;
	289	bi->bmiHeader.biCompression = MKTAG('I','4','2','0');
	290	bi->bmiHeader.biSizeImage = 115200;
	291	dump_bih(s, &bi->bmiHeader);
	292	#endif
	293
c2345207 RP	294	ret = SendMessage(ctx->hwnd, WM_CAP_SET_VIDEOFORMAT, bisize, (LPARAM) bi);
	295	if(!ret) {
	296	av_log(s, AV_LOG_ERROR, "Could not set Video Format.\n");
e110f486	297	goto fail_bi;
c2345207 RP	298	}
	299
	300	biCompression = bi->bmiHeader.biCompression;
	301	biBitCount = bi->bmiHeader.biBitCount;
	302
	303	av_free(bi);
	304
	305	/* Set sequence setup */
	306	ret = SendMessage(ctx->hwnd, WM_CAP_GET_SEQUENCE_SETUP, sizeof(cparms),
	307	(LPARAM) &cparms);
e4d286f1	308	if(!ret)
76c2662b	309	goto fail_io;
c2345207 RP	310
	311	dump_captureparms(s, &cparms);
	312
	313	cparms.fYield = 1; // Spawn a background thread
	314	cparms.dwRequestMicroSecPerFrame =
	315	(ap->time_base.num*1000000) / ap->time_base.den;
	316	cparms.fAbortLeftMouse = 0;
	317	cparms.fAbortRightMouse = 0;
	318	cparms.fCaptureAudio = 0;
	319	cparms.vKeyAbort = 0;
	320
	321	ret = SendMessage(ctx->hwnd, WM_CAP_SET_SEQUENCE_SETUP, sizeof(cparms),
	322	(LPARAM) &cparms);
e4d286f1	323	if(!ret)
76c2662b	324	goto fail_io;
c2345207 RP	325
	326	codec = st->codec;
	327	codec->time_base = ap->time_base;
	328	codec->codec_type = CODEC_TYPE_VIDEO;
	329	codec->width = width;
	330	codec->height = height;
c2345207	331	codec->pix_fmt = vfw_pixfmt(biCompression, biBitCount);
d40b45e8	332	if(codec->pix_fmt == PIX_FMT_NONE) {
1c0b9215 RP	333	codec->codec_id = vfw_codecid(biCompression);
1c0b9215 RP	334	if(codec->codec_id == CODEC_ID_NONE) {
189230ad RP	335	av_log(s, AV_LOG_ERROR, "Unknown compression type. "
189230ad RP	336	"Please report verbose (-v 9) debug information.\n");
c2345207 RP	337	vfw_read_close(s);
c2345207 RP	338	return AVERROR_PATCHWELCOME;
1c0b9215 RP	339	}
1c0b9215 RP	340	codec->bits_per_coded_sample = biBitCount;
c2345207	341	}
1c0b9215	342	else {
42477de5 RP	343	codec->codec_id = CODEC_ID_RAWVIDEO;
	344	if(biCompression == BI_RGB)
	345	codec->bits_per_coded_sample = biBitCount;
1c0b9215	346	}
42477de5 RP	347
42477de5 RP	348	av_set_pts_info(st, 32, 1, 1000);
c2345207 RP	349
	350	ctx->mutex = CreateMutex(NULL, 0, NULL);
	351	if(!ctx->mutex) {
	352	av_log(s, AV_LOG_ERROR, "Could not create Mutex.\n" );
76c2662b	353	goto fail_io;
c2345207 RP	354	}
	355	ctx->event = CreateEvent(NULL, 1, 0, NULL);
	356	if(!ctx->event) {
	357	av_log(s, AV_LOG_ERROR, "Could not create Event.\n" );
76c2662b	358	goto fail_io;
c2345207 RP	359	}
	360
	361	ret = SendMessage(ctx->hwnd, WM_CAP_SEQUENCE_NOFILE, 0, 0);
	362	if(!ret) {
	363	av_log(s, AV_LOG_ERROR, "Could not start capture sequence.\n" );
76c2662b	364	goto fail_io;
c2345207 RP	365	}
	366
	367	return 0;
76c2662b	368
e110f486 RP	369	fail_bi:
	370	av_free(bi);
	371
76c2662b RP	372	fail_io:
	373	vfw_read_close(s);
	374	return AVERROR_IO;
c2345207 RP	375	}
	376
	377	static int vfw_read_packet(AVFormatContext s, AVPacket pkt)
	378	{
	379	struct vfw_ctx *ctx = s->priv_data;
	380	AVPacketList *pktl = NULL;
	381
	382	while(!pktl) {
	383	WaitForSingleObject(ctx->mutex, INFINITE);
	384	pktl = ctx->pktl;
	385	if(ctx->pktl) {
	386	*pkt = ctx->pktl->pkt;
	387	ctx->pktl = ctx->pktl->next;
	388	av_free(pktl);
	389	}
	390	ResetEvent(ctx->event);
	391	ReleaseMutex(ctx->mutex);
	392	if(!pktl) {
	393	if(s->flags & AVFMT_FLAG_NONBLOCK) {
	394	return AVERROR(EAGAIN);
	395	} else {
	396	WaitForSingleObject(ctx->event, INFINITE);
	397	}
	398	}
	399	}
	400
	401	ctx->curbufsize -= pkt->size;
	402
	403	return pkt->size;
	404	}
	405
	406	static int vfw_read_close(AVFormatContext *s)
	407	{
	408	struct vfw_ctx *ctx = s->priv_data;
	409
	410	if(ctx->hwnd) {
	411	SendMessage(ctx->hwnd, WM_CAP_SET_CALLBACK_VIDEOSTREAM, 0, 0);
	412	SendMessage(ctx->hwnd, WM_CAP_DRIVER_DISCONNECT, 0, 0);
	413	DestroyWindow(ctx->hwnd);
	414	}
	415	if(ctx->mutex)
	416	CloseHandle(ctx->mutex);
	417	if(ctx->event)
	418	CloseHandle(ctx->event);
	419
	420	return 0;
	421	}
	422
	423	AVInputFormat vfwcap_demuxer = {
	424	"vfwcap",
bde15e74	425	NULL_IF_CONFIG_SMALL("VFW video capture"),
c2345207 RP	426	sizeof(struct vfw_ctx),
	427	NULL,
	428	vfw_read_header,
	429	vfw_read_packet,
	430	vfw_read_close,
	431	.flags = AVFMT_NOFILE,
	432	};