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ffmpeg / libavdevice / vfwcap.c @ 2912e87a

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1
/*
2
 * VFW capture interface
3
 * Copyright (c) 2006-2008 Ramiro Polla
4
 *
5
 * This file is part of Libav.
6
 *
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 * Libav 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
 * Libav 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
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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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 */
21

    
22
#include "libavformat/avformat.h"
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#include <windows.h>
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#include <vfw.h>
25

    
26
//#define DEBUG_VFW
27

    
28
/* Defines for VFW missing from MinGW.
29
 * Remove this when MinGW incorporates them. */
30
#define HWND_MESSAGE                ((HWND)-3)
31

    
32
#define BI_RGB                      0
33

    
34
/* End of missing MinGW defines */
35

    
36
struct vfw_ctx {
37
    HWND hwnd;
38
    HANDLE mutex;
39
    HANDLE event;
40
    AVPacketList *pktl;
41
    unsigned int curbufsize;
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    unsigned int frame_num;
43
};
44

    
45
static enum PixelFormat vfw_pixfmt(DWORD biCompression, WORD biBitCount)
46
{
47
    switch(biCompression) {
48
    case MKTAG('U', 'Y', 'V', 'Y'):
49
        return PIX_FMT_UYVY422;
50
    case MKTAG('Y', 'U', 'Y', '2'):
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        return PIX_FMT_YUYV422;
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    case MKTAG('I', '4', '2', '0'):
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        return PIX_FMT_YUV420P;
54
    case BI_RGB:
55
        switch(biBitCount) { /* 1-8 are untested */
56
            case 1:
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                return PIX_FMT_MONOWHITE;
58
            case 4:
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                return PIX_FMT_RGB4;
60
            case 8:
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                return PIX_FMT_RGB8;
62
            case 16:
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                return PIX_FMT_RGB555;
64
            case 24:
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                return PIX_FMT_BGR24;
66
            case 32:
67
                return PIX_FMT_RGB32;
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        }
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    }
70
    return PIX_FMT_NONE;
71
}
72

    
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static enum CodecID vfw_codecid(DWORD biCompression)
74
{
75
    switch(biCompression) {
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    case MKTAG('d', 'v', 's', 'd'):
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        return CODEC_ID_DVVIDEO;
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    case MKTAG('M', 'J', 'P', 'G'):
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    case MKTAG('m', 'j', 'p', 'g'):
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        return CODEC_ID_MJPEG;
81
    }
82
    return CODEC_ID_NONE;
83
}
84

    
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#define dstruct(pctx, sname, var, type) \
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    av_log(pctx, AV_LOG_DEBUG, #var":\t%"type"\n", sname->var)
87

    
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static void dump_captureparms(AVFormatContext *s, CAPTUREPARMS *cparms)
89
{
90
    av_log(s, AV_LOG_DEBUG, "CAPTUREPARMS\n");
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    dstruct(s, cparms, dwRequestMicroSecPerFrame, "lu");
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    dstruct(s, cparms, fMakeUserHitOKToCapture, "d");
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    dstruct(s, cparms, wPercentDropForError, "u");
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    dstruct(s, cparms, fYield, "d");
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    dstruct(s, cparms, dwIndexSize, "lu");
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    dstruct(s, cparms, wChunkGranularity, "u");
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    dstruct(s, cparms, fUsingDOSMemory, "d");
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    dstruct(s, cparms, wNumVideoRequested, "u");
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    dstruct(s, cparms, fCaptureAudio, "d");
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    dstruct(s, cparms, wNumAudioRequested, "u");
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    dstruct(s, cparms, vKeyAbort, "u");
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    dstruct(s, cparms, fAbortLeftMouse, "d");
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    dstruct(s, cparms, fAbortRightMouse, "d");
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    dstruct(s, cparms, fLimitEnabled, "d");
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    dstruct(s, cparms, wTimeLimit, "u");
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    dstruct(s, cparms, fMCIControl, "d");
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    dstruct(s, cparms, fStepMCIDevice, "d");
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    dstruct(s, cparms, dwMCIStartTime, "lu");
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    dstruct(s, cparms, dwMCIStopTime, "lu");
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    dstruct(s, cparms, fStepCaptureAt2x, "d");
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    dstruct(s, cparms, wStepCaptureAverageFrames, "u");
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    dstruct(s, cparms, dwAudioBufferSize, "lu");
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    dstruct(s, cparms, fDisableWriteCache, "d");
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    dstruct(s, cparms, AVStreamMaster, "u");
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}
116

    
117
static void dump_videohdr(AVFormatContext *s, VIDEOHDR *vhdr)
118
{
119
#ifdef DEBUG_VFW
120
    av_log(s, AV_LOG_DEBUG, "VIDEOHDR\n");
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    dstruct(s, vhdr, lpData, "p");
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    dstruct(s, vhdr, dwBufferLength, "lu");
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    dstruct(s, vhdr, dwBytesUsed, "lu");
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    dstruct(s, vhdr, dwTimeCaptured, "lu");
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    dstruct(s, vhdr, dwUser, "lu");
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    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");
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    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

    
152
static int shall_we_drop(AVFormatContext *s)
153
{
154
    struct vfw_ctx *ctx = s->priv_data;
155
    const uint8_t dropscore[] = {62, 75, 87, 100};
156
    const int ndropscores = FF_ARRAY_ELEMS(dropscore);
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    unsigned int buffer_fullness = (ctx->curbufsize*100)/s->max_picture_buffer;
158

    
159
    if(dropscore[++ctx->frame_num%ndropscores] <= buffer_fullness) {
160
        av_log(s, AV_LOG_ERROR,
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
{
170
    AVFormatContext *s;
171
    struct vfw_ctx *ctx;
172
    AVPacketList **ppktl, *pktl_next;
173

    
174
    s = (AVFormatContext *) GetWindowLongPtr(hwnd, GWLP_USERDATA);
175
    ctx = s->priv_data;
176

    
177
    dump_videohdr(s, vdhdr);
178

    
179
    if(shall_we_drop(s))
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

    
210
static int vfw_read_close(AVFormatContext *s)
211
{
212
    struct vfw_ctx *ctx = s->priv_data;
213
    AVPacketList *pktl;
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

    
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

    
233
    return 0;
234
}
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 (!strcmp(s->filename, "list")) {
252
        for (devnum = 0; devnum <= 9; devnum++) {
253
            char driver_name[256];
254
            char driver_ver[256];
255
            ret = capGetDriverDescription(devnum,
256
                                          driver_name, sizeof(driver_name),
257
                                          driver_ver, sizeof(driver_ver));
258
            if (ret) {
259
                av_log(s, AV_LOG_INFO, "Driver %d\n", devnum);
260
                av_log(s, AV_LOG_INFO, " %s\n", driver_name);
261
                av_log(s, AV_LOG_INFO, " %s\n", driver_ver);
262
            }
263
        }
264
        return AVERROR(EIO);
265
    }
266

    
267
    if(!ap->time_base.den) {
268
        av_log(s, AV_LOG_ERROR, "A time base must be specified.\n");
269
        return AVERROR(EIO);
270
    }
271

    
272
    ctx->hwnd = capCreateCaptureWindow(NULL, 0, 0, 0, 0, 0, HWND_MESSAGE, 0);
273
    if(!ctx->hwnd) {
274
        av_log(s, AV_LOG_ERROR, "Could not create capture window.\n");
275
        return AVERROR(EIO);
276
    }
277

    
278
    /* If atoi fails, devnum==0 and the default device is used */
279
    devnum = atoi(s->filename);
280

    
281
    ret = SendMessage(ctx->hwnd, WM_CAP_DRIVER_CONNECT, devnum, 0);
282
    if(!ret) {
283
        av_log(s, AV_LOG_ERROR, "Could not connect to device.\n");
284
        DestroyWindow(ctx->hwnd);
285
        return AVERROR(ENODEV);
286
    }
287

    
288
    SendMessage(ctx->hwnd, WM_CAP_SET_OVERLAY, 0, 0);
289
    SendMessage(ctx->hwnd, WM_CAP_SET_PREVIEW, 0, 0);
290

    
291
    ret = SendMessage(ctx->hwnd, WM_CAP_SET_CALLBACK_VIDEOSTREAM, 0,
292
                      (LPARAM) videostream_cb);
293
    if(!ret) {
294
        av_log(s, AV_LOG_ERROR, "Could not set video stream callback.\n");
295
        goto fail_io;
296
    }
297

    
298
    SetWindowLongPtr(ctx->hwnd, GWLP_USERDATA, (LONG_PTR) s);
299

    
300
    st = av_new_stream(s, 0);
301
    if(!st) {
302
        vfw_read_close(s);
303
        return AVERROR(ENOMEM);
304
    }
305

    
306
    /* Set video format */
307
    bisize = SendMessage(ctx->hwnd, WM_CAP_GET_VIDEOFORMAT, 0, 0);
308
    if(!bisize)
309
        goto fail_io;
310
    bi = av_malloc(bisize);
311
    if(!bi) {
312
        vfw_read_close(s);
313
        return AVERROR(ENOMEM);
314
    }
315
    ret = SendMessage(ctx->hwnd, WM_CAP_GET_VIDEOFORMAT, bisize, (LPARAM) bi);
316
    if(!ret)
317
        goto fail_bi;
318

    
319
    dump_bih(s, &bi->bmiHeader);
320

    
321
    width  = ap->width  ? ap->width  : bi->bmiHeader.biWidth ;
322
    height = ap->height ? ap->height : bi->bmiHeader.biHeight;
323
    bi->bmiHeader.biWidth  = width ;
324
    bi->bmiHeader.biHeight = height;
325

    
326
    if (0) {
327
        /* For testing yet unsupported compressions
328
         * Copy these values from user-supplied verbose information */
329
        bi->bmiHeader.biWidth       = 320;
330
        bi->bmiHeader.biHeight      = 240;
331
        bi->bmiHeader.biPlanes      = 1;
332
        bi->bmiHeader.biBitCount    = 12;
333
        bi->bmiHeader.biCompression = MKTAG('I','4','2','0');
334
        bi->bmiHeader.biSizeImage   = 115200;
335
        dump_bih(s, &bi->bmiHeader);
336
    }
337

    
338
    ret = SendMessage(ctx->hwnd, WM_CAP_SET_VIDEOFORMAT, bisize, (LPARAM) bi);
339
    if(!ret) {
340
        av_log(s, AV_LOG_ERROR, "Could not set Video Format.\n");
341
        goto fail_bi;
342
    }
343

    
344
    biCompression = bi->bmiHeader.biCompression;
345
    biBitCount = bi->bmiHeader.biBitCount;
346

    
347
    av_free(bi);
348

    
349
    /* Set sequence setup */
350
    ret = SendMessage(ctx->hwnd, WM_CAP_GET_SEQUENCE_SETUP, sizeof(cparms),
351
                      (LPARAM) &cparms);
352
    if(!ret)
353
        goto fail_io;
354

    
355
    dump_captureparms(s, &cparms);
356

    
357
    cparms.fYield = 1; // Spawn a background thread
358
    cparms.dwRequestMicroSecPerFrame =
359
                               (ap->time_base.num*1000000) / ap->time_base.den;
360
    cparms.fAbortLeftMouse = 0;
361
    cparms.fAbortRightMouse = 0;
362
    cparms.fCaptureAudio = 0;
363
    cparms.vKeyAbort = 0;
364

    
365
    ret = SendMessage(ctx->hwnd, WM_CAP_SET_SEQUENCE_SETUP, sizeof(cparms),
366
                      (LPARAM) &cparms);
367
    if(!ret)
368
        goto fail_io;
369

    
370
    codec = st->codec;
371
    codec->time_base = ap->time_base;
372
    codec->codec_type = AVMEDIA_TYPE_VIDEO;
373
    codec->width = width;
374
    codec->height = height;
375
    codec->pix_fmt = vfw_pixfmt(biCompression, biBitCount);
376
    if(codec->pix_fmt == PIX_FMT_NONE) {
377
        codec->codec_id = vfw_codecid(biCompression);
378
        if(codec->codec_id == CODEC_ID_NONE) {
379
            av_log(s, AV_LOG_ERROR, "Unknown compression type. "
380
                             "Please report verbose (-v 9) debug information.\n");
381
            vfw_read_close(s);
382
            return AVERROR_PATCHWELCOME;
383
        }
384
        codec->bits_per_coded_sample = biBitCount;
385
    } else {
386
        codec->codec_id = CODEC_ID_RAWVIDEO;
387
        if(biCompression == BI_RGB) {
388
            codec->bits_per_coded_sample = biBitCount;
389
            codec->extradata = av_malloc(9 + FF_INPUT_BUFFER_PADDING_SIZE);
390
            if (codec->extradata) {
391
                codec->extradata_size = 9;
392
                memcpy(codec->extradata, "BottomUp", 9);
393
            }
394
        }
395
    }
396

    
397
    av_set_pts_info(st, 32, 1, 1000);
398

    
399
    ctx->mutex = CreateMutex(NULL, 0, NULL);
400
    if(!ctx->mutex) {
401
        av_log(s, AV_LOG_ERROR, "Could not create Mutex.\n" );
402
        goto fail_io;
403
    }
404
    ctx->event = CreateEvent(NULL, 1, 0, NULL);
405
    if(!ctx->event) {
406
        av_log(s, AV_LOG_ERROR, "Could not create Event.\n" );
407
        goto fail_io;
408
    }
409

    
410
    ret = SendMessage(ctx->hwnd, WM_CAP_SEQUENCE_NOFILE, 0, 0);
411
    if(!ret) {
412
        av_log(s, AV_LOG_ERROR, "Could not start capture sequence.\n" );
413
        goto fail_io;
414
    }
415

    
416
    return 0;
417

    
418
fail_bi:
419
    av_free(bi);
420

    
421
fail_io:
422
    vfw_read_close(s);
423
    return AVERROR(EIO);
424
}
425

    
426
static int vfw_read_packet(AVFormatContext *s, AVPacket *pkt)
427
{
428
    struct vfw_ctx *ctx = s->priv_data;
429
    AVPacketList *pktl = NULL;
430

    
431
    while(!pktl) {
432
        WaitForSingleObject(ctx->mutex, INFINITE);
433
        pktl = ctx->pktl;
434
        if(ctx->pktl) {
435
            *pkt = ctx->pktl->pkt;
436
            ctx->pktl = ctx->pktl->next;
437
            av_free(pktl);
438
        }
439
        ResetEvent(ctx->event);
440
        ReleaseMutex(ctx->mutex);
441
        if(!pktl) {
442
            if(s->flags & AVFMT_FLAG_NONBLOCK) {
443
                return AVERROR(EAGAIN);
444
            } else {
445
                WaitForSingleObject(ctx->event, INFINITE);
446
            }
447
        }
448
    }
449

    
450
    ctx->curbufsize -= pkt->size;
451

    
452
    return pkt->size;
453
}
454

    
455
AVInputFormat ff_vfwcap_demuxer = {
456
    "vfwcap",
457
    NULL_IF_CONFIG_SMALL("VFW video capture"),
458
    sizeof(struct vfw_ctx),
459
    NULL,
460
    vfw_read_header,
461
    vfw_read_packet,
462
    vfw_read_close,
463
    .flags = AVFMT_NOFILE,
464
};