aboutsummaryrefslogtreecommitdiffstats
path: root/libavdevice/vfwcap.c
blob: 61b038323c7d3eb4b608999cfda49643011522c4 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
/*
 * VFW capture interface
 * Copyright (c) 2006-2008 Ramiro Polla
 *
 * This file is part of Libav.
 *
 * Libav 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.
 *
 * Libav 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 Libav; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

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

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

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
    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 ret;
    AVRational framerate_q;

    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);
    }

    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);


    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 (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 =
                               (framerate_q.den*1000000) / framerate_q.num;
    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 = (AVRational){framerate_q.den, framerate_q.num};
    codec->codec_type = AVMEDIA_TYPE_VIDEO;
    codec->width  = bi->bmiHeader.biWidth;
    codec->height = bi->bmiHeader.biHeight;
    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;
}

#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), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
    { "framerate", "", OFFSET(framerate), AV_OPT_TYPE_STRING, {.str = "ntsc"}, 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,
};

AVInputFormat ff_vfwcap_demuxer = {
    .name           = "vfwcap",
    .long_name      = NULL_IF_CONFIG_SMALL("VfW video capture"),
    .priv_data_size = sizeof(struct vfw_ctx),
    .read_header    = vfw_read_header,
    .read_packet    = vfw_read_packet,
    .read_close     = vfw_read_close,
    .flags          = AVFMT_NOFILE,
    .priv_class     = &vfw_class,
};