libavdevice/vfwcap.c

   1 /*
   2  * VFW capture interface
   3  * Copyright (c) 2006-2008 Ramiro Polla
   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
  22 #include "libavformat/avformat.h"
  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. */
  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     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;
  51     case MKTAG('I', '4', '2', '0'):
  52         return PIX_FMT_YUV420P;
  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     }
  69     return -1;
  70 }
  71
  72 #define dstruct(pctx, sname, var, type) \
  73     av_log(pctx, AV_LOG_DEBUG, #var":\t%"type"\n", sname->var)
  74
  75 static void dump_captureparms(AVFormatContext *s, CAPTUREPARMS *cparms)
  76 {
  77     av_log(s, AV_LOG_DEBUG, "CAPTUREPARMS\n");
  78     dstruct(s, cparms, dwRequestMicroSecPerFrame, "lu");
  79     dstruct(s, cparms, fMakeUserHitOKToCapture, "d");
  80     dstruct(s, cparms, wPercentDropForError, "u");
  81     dstruct(s, cparms, fYield, "d");
  82     dstruct(s, cparms, dwIndexSize, "lu");
  83     dstruct(s, cparms, wChunkGranularity, "u");
  84     dstruct(s, cparms, fUsingDOSMemory, "d");
  85     dstruct(s, cparms, wNumVideoRequested, "u");
  86     dstruct(s, cparms, fCaptureAudio, "d");
  87     dstruct(s, cparms, wNumAudioRequested, "u");
  88     dstruct(s, cparms, vKeyAbort, "u");
  89     dstruct(s, cparms, fAbortLeftMouse, "d");
  90     dstruct(s, cparms, fAbortRightMouse, "d");
  91     dstruct(s, cparms, fLimitEnabled, "d");
  92     dstruct(s, cparms, wTimeLimit, "u");
  93     dstruct(s, cparms, fMCIControl, "d");
  94     dstruct(s, cparms, fStepMCIDevice, "d");
  95     dstruct(s, cparms, dwMCIStartTime, "lu");
  96     dstruct(s, cparms, dwMCIStopTime, "lu");
  97     dstruct(s, cparms, fStepCaptureAt2x, "d");
  98     dstruct(s, cparms, wStepCaptureAverageFrames, "u");
  99     dstruct(s, cparms, dwAudioBufferSize, "lu");
 100     dstruct(s, cparms, fDisableWriteCache, "d");
 101     dstruct(s, cparms, AVStreamMaster, "u");
 102 }
 103
 104 static void dump_videohdr(AVFormatContext *s, VIDEOHDR *vhdr)
 105 {
 106 #ifdef DEBUG_VFW
 107     av_log(s, AV_LOG_DEBUG, "VIDEOHDR\n");
 108     dstruct(s, vhdr, lpData, "p");
 109     dstruct(s, vhdr, dwBufferLength, "lu");
 110     dstruct(s, vhdr, dwBytesUsed, "lu");
 111     dstruct(s, vhdr, dwTimeCaptured, "lu");
 112     dstruct(s, vhdr, dwUser, "lu");
 113     dstruct(s, vhdr, dwFlags, "lu");
 114     dstruct(s, vhdr, dwReserved[0], "lu");
 115     dstruct(s, vhdr, dwReserved[1], "lu");
 116     dstruct(s, vhdr, dwReserved[2], "lu");
 117     dstruct(s, vhdr, dwReserved[3], "lu");
 118 #endif
 119 }
 120
 121 static void dump_bih(AVFormatContext *s, BITMAPINFOHEADER *bih)
 122 {
 123     av_log(s, AV_LOG_DEBUG, "BITMAPINFOHEADER\n");
 124     dstruct(s, bih, biSize, "lu");
 125     dstruct(s, bih, biWidth, "ld");
 126     dstruct(s, bih, biHeight, "ld");
 127     dstruct(s, bih, biPlanes, "d");
 128     dstruct(s, bih, biBitCount, "d");
 129     dstruct(s, bih, biCompression, "lu");
 130     av_log(s, AV_LOG_DEBUG, "    biCompression:\t\"%.4s\"\n",
 131                    (char*) &bih->biCompression);
 132     dstruct(s, bih, biSizeImage, "lu");
 133     dstruct(s, bih, biXPelsPerMeter, "lu");
 134     dstruct(s, bih, biYPelsPerMeter, "lu");
 135     dstruct(s, bih, biClrUsed, "lu");
 136     dstruct(s, bih, biClrImportant, "lu");
 137 }
 138
 139 static int shall_we_drop(struct vfw_ctx *ctx)
 140 {
 141     AVFormatContext *s = ctx->s;
 142     const uint8_t dropscore[] = {62, 75, 87, 100};
 143     const int ndropscores = FF_ARRAY_ELEMS(dropscore);
 144     unsigned int buffer_fullness = (ctx->curbufsize*100)/s->max_picture_buffer;
 145
 146     if(dropscore[++ctx->frame_num%ndropscores] <= buffer_fullness) {
 147         av_log(ctx->s, AV_LOG_ERROR,
 148               "real-time buffer %d%% full! frame dropped!\n", buffer_fullness);
 149         return 1;
 150     }
 151
 152     return 0;
 153 }
 154
 155 static LRESULT CALLBACK videostream_cb(HWND hwnd, LPVIDEOHDR vdhdr)
 156 {
 157     struct vfw_ctx *ctx;
 158     AVPacketList **ppktl, *pktl_next;
 159
 160     ctx = (struct vfw_ctx *) GetWindowLongPtr(hwnd, GWLP_USERDATA);
 161
 162     dump_videohdr(ctx->s, vdhdr);
 163
 164     if(shall_we_drop(ctx))
 165         return FALSE;
 166
 167     WaitForSingleObject(ctx->mutex, INFINITE);
 168
 169     pktl_next = av_mallocz(sizeof(AVPacketList));
 170     if(!pktl_next)
 171         goto fail;
 172
 173     if(av_new_packet(&pktl_next->pkt, vdhdr->dwBytesUsed) < 0) {
 174         av_free(pktl_next);
 175         goto fail;
 176     }
 177
 178     pktl_next->pkt.pts = vdhdr->dwTimeCaptured;
 179     memcpy(pktl_next->pkt.data, vdhdr->lpData, vdhdr->dwBytesUsed);
 180
 181     for(ppktl = &ctx->pktl ; *ppktl ; ppktl = &(*ppktl)->next);
 182     *ppktl = pktl_next;
 183
 184     ctx->curbufsize += vdhdr->dwBytesUsed;
 185
 186     SetEvent(ctx->event);
 187     ReleaseMutex(ctx->mutex);
 188
 189     return TRUE;
 190 fail:
 191     ReleaseMutex(ctx->mutex);
 192     return FALSE;
 193 }
 194
 195 static int vfw_read_close(AVFormatContext *s);
 196
 197 static int vfw_read_header(AVFormatContext *s, AVFormatParameters *ap)
 198 {
 199     struct vfw_ctx *ctx = s->priv_data;
 200     AVCodecContext *codec;
 201     AVStream *st;
 202     int devnum;
 203     int bisize;
 204     BITMAPINFO *bi;
 205     CAPTUREPARMS cparms;
 206     DWORD biCompression;
 207     WORD biBitCount;
 208     int width;
 209     int height;
 210     int ret;
 211
 212     if(!ap->time_base.den) {
 213         av_log(s, AV_LOG_ERROR, "A time base must be specified.\n");
 214         return AVERROR_IO;
 215     }
 216
 217     ctx->s = s;
 218
 219     ctx->hwnd = capCreateCaptureWindow(NULL, 0, 0, 0, 0, 0, HWND_MESSAGE, 0);
 220     if(!ctx->hwnd) {
 221         av_log(s, AV_LOG_ERROR, "Could not create capture window.\n");
 222         return AVERROR_IO;
 223     }
 224
 225     /* If atoi fails, devnum==0 and the default device is used */
 226     devnum = atoi(s->filename);
 227
 228     ret = SendMessage(ctx->hwnd, WM_CAP_DRIVER_CONNECT, devnum, 0);
 229     if(!ret) {
 230         av_log(s, AV_LOG_ERROR, "Could not connect to device.\n");
 231         DestroyWindow(ctx->hwnd);
 232         return AVERROR(ENODEV);
 233     }
 234
 235     SendMessage(ctx->hwnd, WM_CAP_SET_OVERLAY, 0, 0);
 236     SendMessage(ctx->hwnd, WM_CAP_SET_PREVIEW, 0, 0);
 237
 238     ret = SendMessage(ctx->hwnd, WM_CAP_SET_CALLBACK_VIDEOSTREAM, 0,
 239                       (LPARAM) videostream_cb);
 240     if(!ret) {
 241         av_log(s, AV_LOG_ERROR, "Could not set video stream callback.\n");
 242         goto fail_io;
 243     }
 244
 245     SetWindowLongPtr(ctx->hwnd, GWLP_USERDATA, (LONG_PTR) ctx);
 246
 247     st = av_new_stream(s, 0);
 248     if(!st) {
 249         vfw_read_close(s);
 250         return AVERROR_NOMEM;
 251     }
 252
 253     /* Set video format */
 254     bisize = SendMessage(ctx->hwnd, WM_CAP_GET_VIDEOFORMAT, 0, 0);
 255     if(!bisize)
 256         goto fail_io;
 257     bi = av_malloc(bisize);
 258     if(!bi) {
 259         vfw_read_close(s);
 260         return AVERROR_NOMEM;
 261     }
 262     ret = SendMessage(ctx->hwnd, WM_CAP_GET_VIDEOFORMAT, bisize, (LPARAM) bi);
 263     if(!ret)
 264         goto fail_bi;
 265
 266     dump_bih(s, &bi->bmiHeader);
 267
 268     width  = ap->width  ? ap->width  : bi->bmiHeader.biWidth ;
 269     height = ap->height ? ap->height : bi->bmiHeader.biHeight;
 270     bi->bmiHeader.biWidth  = width ;
 271     bi->bmiHeader.biHeight = height;
 272
 273 #if 0
 274     /* For testing yet unsupported compressions
 275      * Copy these values from user-supplied verbose information */
 276     bi->bmiHeader.biWidth       = 320;
 277     bi->bmiHeader.biHeight      = 240;
 278     bi->bmiHeader.biPlanes      = 1;
 279     bi->bmiHeader.biBitCount    = 12;
 280     bi->bmiHeader.biCompression = MKTAG('I','4','2','0');
 281     bi->bmiHeader.biSizeImage   = 115200;
 282     dump_bih(s, &bi->bmiHeader);
 283 #endif
 284
 285     ret = SendMessage(ctx->hwnd, WM_CAP_SET_VIDEOFORMAT, bisize, (LPARAM) bi);
 286     if(!ret) {
 287         av_log(s, AV_LOG_ERROR, "Could not set Video Format.\n");
 288         goto fail_bi;
 289     }
 290
 291     biCompression = bi->bmiHeader.biCompression;
 292     biBitCount = bi->bmiHeader.biBitCount;
 293
 294     av_free(bi);
 295
 296     /* Set sequence setup */
 297     ret = SendMessage(ctx->hwnd, WM_CAP_GET_SEQUENCE_SETUP, sizeof(cparms),
 298                       (LPARAM) &cparms);
 299     if(!ret)
 300         goto fail_io;
 301
 302     dump_captureparms(s, &cparms);
 303
 304     cparms.fYield = 1; // Spawn a background thread
 305     cparms.dwRequestMicroSecPerFrame =
 306                                (ap->time_base.num*1000000) / ap->time_base.den;
 307     cparms.fAbortLeftMouse = 0;
 308     cparms.fAbortRightMouse = 0;
 309     cparms.fCaptureAudio = 0;
 310     cparms.vKeyAbort = 0;
 311
 312     ret = SendMessage(ctx->hwnd, WM_CAP_SET_SEQUENCE_SETUP, sizeof(cparms),
 313                       (LPARAM) &cparms);
 314     if(!ret)
 315         goto fail_io;
 316
 317     codec = st->codec;
 318     codec->time_base = ap->time_base;
 319     codec->codec_type = CODEC_TYPE_VIDEO;
 320     codec->width = width;
 321     codec->height = height;
 322     codec->codec_id = CODEC_ID_RAWVIDEO;
 323     codec->pix_fmt = vfw_pixfmt(biCompression, biBitCount);
 324     if(biCompression == BI_RGB)
 325         codec->bits_per_coded_sample = biBitCount;
 326
 327     av_set_pts_info(st, 32, 1, 1000);
 328
 329     if(codec->pix_fmt == -1) {
 330         av_log(s, AV_LOG_ERROR, "Unknown compression type."
 331                          "Please report verbose (-v 99) debug information.\n");
 332         vfw_read_close(s);
 333         return AVERROR_PATCHWELCOME;
 334     }
 335
 336     ctx->mutex = CreateMutex(NULL, 0, NULL);
 337     if(!ctx->mutex) {
 338         av_log(s, AV_LOG_ERROR, "Could not create Mutex.\n" );
 339         goto fail_io;
 340     }
 341     ctx->event = CreateEvent(NULL, 1, 0, NULL);
 342     if(!ctx->event) {
 343         av_log(s, AV_LOG_ERROR, "Could not create Event.\n" );
 344         goto fail_io;
 345     }
 346
 347     ret = SendMessage(ctx->hwnd, WM_CAP_SEQUENCE_NOFILE, 0, 0);
 348     if(!ret) {
 349         av_log(s, AV_LOG_ERROR, "Could not start capture sequence.\n" );
 350         goto fail_io;
 351     }
 352
 353     return 0;
 354
 355 fail_bi:
 356     av_free(bi);
 357
 358 fail_io:
 359     vfw_read_close(s);
 360     return AVERROR_IO;
 361 }
 362
 363 static int vfw_read_packet(AVFormatContext *s, AVPacket *pkt)
 364 {
 365     struct vfw_ctx *ctx = s->priv_data;
 366     AVPacketList *pktl = NULL;
 367
 368     while(!pktl) {
 369         WaitForSingleObject(ctx->mutex, INFINITE);
 370         pktl = ctx->pktl;
 371         if(ctx->pktl) {
 372             *pkt = ctx->pktl->pkt;
 373             ctx->pktl = ctx->pktl->next;
 374             av_free(pktl);
 375         }
 376         ResetEvent(ctx->event);
 377         ReleaseMutex(ctx->mutex);
 378         if(!pktl) {
 379             if(s->flags & AVFMT_FLAG_NONBLOCK) {
 380                 return AVERROR(EAGAIN);
 381             } else {
 382                 WaitForSingleObject(ctx->event, INFINITE);
 383             }
 384         }
 385     }
 386
 387     ctx->curbufsize -= pkt->size;
 388
 389     return pkt->size;
 390 }
 391
 392 static int vfw_read_close(AVFormatContext *s)
 393 {
 394     struct vfw_ctx *ctx = s->priv_data;
 395
 396     if(ctx->hwnd) {
 397         SendMessage(ctx->hwnd, WM_CAP_SET_CALLBACK_VIDEOSTREAM, 0, 0);
 398         SendMessage(ctx->hwnd, WM_CAP_DRIVER_DISCONNECT, 0, 0);
 399         DestroyWindow(ctx->hwnd);
 400     }
 401     if(ctx->mutex)
 402         CloseHandle(ctx->mutex);
 403     if(ctx->event)
 404         CloseHandle(ctx->event);
 405
 406     return 0;
 407 }
 408
 409 AVInputFormat vfwcap_demuxer = {
 410     "vfwcap",
 411     NULL_IF_CONFIG_SMALL("VFW video capture"),
 412     sizeof(struct vfw_ctx),
 413     NULL,
 414     vfw_read_header,
 415     vfw_read_packet,
 416     vfw_read_close,
 417     .flags = AVFMT_NOFILE,
 418 };