91714571cdbf1127e794da3e4b9ba71e33a6d46d
[libav.git] / 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 <windows.h>
24 #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 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('U', 'Y', 'V', 'Y'):
50 return PIX_FMT_UYVY422;
51 case MKTAG('Y', 'U', 'Y', '2'):
52 return PIX_FMT_YUYV422;
53 case MKTAG('I', '4', '2', '0'):
54 return PIX_FMT_YUV420P;
55 case BI_RGB:
56 switch(biBitCount) { /* 1-8 are untested */
57 case 1:
58 return PIX_FMT_MONOWHITE;
59 case 4:
60 return PIX_FMT_RGB4;
61 case 8:
62 return PIX_FMT_RGB8;
63 case 16:
64 return PIX_FMT_RGB555;
65 case 24:
66 return PIX_FMT_BGR24;
67 case 32:
68 return PIX_FMT_RGB32;
69 }
70 }
71 return PIX_FMT_NONE;
72 }
73
74 static enum CodecID vfw_codecid(DWORD biCompression)
75 {
76 switch(biCompression) {
77 case MKTAG('d', 'v', 's', 'd'):
78 return CODEC_ID_DVVIDEO;
79 case MKTAG('M', 'J', 'P', 'G'):
80 case MKTAG('m', 'j', 'p', 'g'):
81 return CODEC_ID_MJPEG;
82 }
83 return CODEC_ID_NONE;
84 }
85
86 #define dstruct(pctx, sname, var, type) \
87 av_log(pctx, AV_LOG_DEBUG, #var":\t%"type"\n", sname->var)
88
89 static void dump_captureparms(AVFormatContext *s, CAPTUREPARMS *cparms)
90 {
91 av_log(s, AV_LOG_DEBUG, "CAPTUREPARMS\n");
92 dstruct(s, cparms, dwRequestMicroSecPerFrame, "lu");
93 dstruct(s, cparms, fMakeUserHitOKToCapture, "d");
94 dstruct(s, cparms, wPercentDropForError, "u");
95 dstruct(s, cparms, fYield, "d");
96 dstruct(s, cparms, dwIndexSize, "lu");
97 dstruct(s, cparms, wChunkGranularity, "u");
98 dstruct(s, cparms, fUsingDOSMemory, "d");
99 dstruct(s, cparms, wNumVideoRequested, "u");
100 dstruct(s, cparms, fCaptureAudio, "d");
101 dstruct(s, cparms, wNumAudioRequested, "u");
102 dstruct(s, cparms, vKeyAbort, "u");
103 dstruct(s, cparms, fAbortLeftMouse, "d");
104 dstruct(s, cparms, fAbortRightMouse, "d");
105 dstruct(s, cparms, fLimitEnabled, "d");
106 dstruct(s, cparms, wTimeLimit, "u");
107 dstruct(s, cparms, fMCIControl, "d");
108 dstruct(s, cparms, fStepMCIDevice, "d");
109 dstruct(s, cparms, dwMCIStartTime, "lu");
110 dstruct(s, cparms, dwMCIStopTime, "lu");
111 dstruct(s, cparms, fStepCaptureAt2x, "d");
112 dstruct(s, cparms, wStepCaptureAverageFrames, "u");
113 dstruct(s, cparms, dwAudioBufferSize, "lu");
114 dstruct(s, cparms, fDisableWriteCache, "d");
115 dstruct(s, cparms, AVStreamMaster, "u");
116 }
117
118 static void dump_videohdr(AVFormatContext *s, VIDEOHDR *vhdr)
119 {
120 #ifdef DEBUG_VFW
121 av_log(s, AV_LOG_DEBUG, "VIDEOHDR\n");
122 dstruct(s, vhdr, lpData, "p");
123 dstruct(s, vhdr, dwBufferLength, "lu");
124 dstruct(s, vhdr, dwBytesUsed, "lu");
125 dstruct(s, vhdr, dwTimeCaptured, "lu");
126 dstruct(s, vhdr, dwUser, "lu");
127 dstruct(s, vhdr, dwFlags, "lu");
128 dstruct(s, vhdr, dwReserved[0], "lu");
129 dstruct(s, vhdr, dwReserved[1], "lu");
130 dstruct(s, vhdr, dwReserved[2], "lu");
131 dstruct(s, vhdr, dwReserved[3], "lu");
132 #endif
133 }
134
135 static void dump_bih(AVFormatContext *s, BITMAPINFOHEADER *bih)
136 {
137 av_log(s, AV_LOG_DEBUG, "BITMAPINFOHEADER\n");
138 dstruct(s, bih, biSize, "lu");
139 dstruct(s, bih, biWidth, "ld");
140 dstruct(s, bih, biHeight, "ld");
141 dstruct(s, bih, biPlanes, "d");
142 dstruct(s, bih, biBitCount, "d");
143 dstruct(s, bih, biCompression, "lu");
144 av_log(s, AV_LOG_DEBUG, " biCompression:\t\"%.4s\"\n",
145 (char*) &bih->biCompression);
146 dstruct(s, bih, biSizeImage, "lu");
147 dstruct(s, bih, biXPelsPerMeter, "lu");
148 dstruct(s, bih, biYPelsPerMeter, "lu");
149 dstruct(s, bih, biClrUsed, "lu");
150 dstruct(s, bih, biClrImportant, "lu");
151 }
152
153 static int shall_we_drop(struct vfw_ctx *ctx)
154 {
155 AVFormatContext *s = ctx->s;
156 const uint8_t dropscore[] = {62, 75, 87, 100};
157 const int ndropscores = FF_ARRAY_ELEMS(dropscore);
158 unsigned int buffer_fullness = (ctx->curbufsize*100)/s->max_picture_buffer;
159
160 if(dropscore[++ctx->frame_num%ndropscores] <= buffer_fullness) {
161 av_log(ctx->s, AV_LOG_ERROR,
162 "real-time buffer %d%% full! frame dropped!\n", buffer_fullness);
163 return 1;
164 }
165
166 return 0;
167 }
168
169 static LRESULT CALLBACK videostream_cb(HWND hwnd, LPVIDEOHDR vdhdr)
170 {
171 struct vfw_ctx *ctx;
172 AVPacketList **ppktl, *pktl_next;
173
174 ctx = (struct vfw_ctx *) GetWindowLongPtr(hwnd, GWLP_USERDATA);
175
176 dump_videohdr(ctx->s, vdhdr);
177
178 if(shall_we_drop(ctx))
179 return FALSE;
180
181 WaitForSingleObject(ctx->mutex, INFINITE);
182
183 pktl_next = av_mallocz(sizeof(AVPacketList));
184 if(!pktl_next)
185 goto fail;
186
187 if(av_new_packet(&pktl_next->pkt, vdhdr->dwBytesUsed) < 0) {
188 av_free(pktl_next);
189 goto fail;
190 }
191
192 pktl_next->pkt.pts = vdhdr->dwTimeCaptured;
193 memcpy(pktl_next->pkt.data, vdhdr->lpData, vdhdr->dwBytesUsed);
194
195 for(ppktl = &ctx->pktl ; *ppktl ; ppktl = &(*ppktl)->next);
196 *ppktl = pktl_next;
197
198 ctx->curbufsize += vdhdr->dwBytesUsed;
199
200 SetEvent(ctx->event);
201 ReleaseMutex(ctx->mutex);
202
203 return TRUE;
204 fail:
205 ReleaseMutex(ctx->mutex);
206 return FALSE;
207 }
208
209 static int vfw_read_close(AVFormatContext *s)
210 {
211 struct vfw_ctx *ctx = s->priv_data;
212
213 if(ctx->hwnd) {
214 SendMessage(ctx->hwnd, WM_CAP_SET_CALLBACK_VIDEOSTREAM, 0, 0);
215 SendMessage(ctx->hwnd, WM_CAP_DRIVER_DISCONNECT, 0, 0);
216 DestroyWindow(ctx->hwnd);
217 }
218 if(ctx->mutex)
219 CloseHandle(ctx->mutex);
220 if(ctx->event)
221 CloseHandle(ctx->event);
222
223 return 0;
224 }
225
226 static int vfw_read_header(AVFormatContext *s, AVFormatParameters *ap)
227 {
228 struct vfw_ctx *ctx = s->priv_data;
229 AVCodecContext *codec;
230 AVStream *st;
231 int devnum;
232 int bisize;
233 BITMAPINFO *bi;
234 CAPTUREPARMS cparms;
235 DWORD biCompression;
236 WORD biBitCount;
237 int width;
238 int height;
239 int ret;
240
241 if(!ap->time_base.den) {
242 av_log(s, AV_LOG_ERROR, "A time base must be specified.\n");
243 return AVERROR_IO;
244 }
245
246 ctx->s = s;
247
248 ctx->hwnd = capCreateCaptureWindow(NULL, 0, 0, 0, 0, 0, HWND_MESSAGE, 0);
249 if(!ctx->hwnd) {
250 av_log(s, AV_LOG_ERROR, "Could not create capture window.\n");
251 return AVERROR_IO;
252 }
253
254 /* If atoi fails, devnum==0 and the default device is used */
255 devnum = atoi(s->filename);
256
257 ret = SendMessage(ctx->hwnd, WM_CAP_DRIVER_CONNECT, devnum, 0);
258 if(!ret) {
259 av_log(s, AV_LOG_ERROR, "Could not connect to device.\n");
260 DestroyWindow(ctx->hwnd);
261 return AVERROR(ENODEV);
262 }
263
264 SendMessage(ctx->hwnd, WM_CAP_SET_OVERLAY, 0, 0);
265 SendMessage(ctx->hwnd, WM_CAP_SET_PREVIEW, 0, 0);
266
267 ret = SendMessage(ctx->hwnd, WM_CAP_SET_CALLBACK_VIDEOSTREAM, 0,
268 (LPARAM) videostream_cb);
269 if(!ret) {
270 av_log(s, AV_LOG_ERROR, "Could not set video stream callback.\n");
271 goto fail_io;
272 }
273
274 SetWindowLongPtr(ctx->hwnd, GWLP_USERDATA, (LONG_PTR) ctx);
275
276 st = av_new_stream(s, 0);
277 if(!st) {
278 vfw_read_close(s);
279 return AVERROR_NOMEM;
280 }
281
282 /* Set video format */
283 bisize = SendMessage(ctx->hwnd, WM_CAP_GET_VIDEOFORMAT, 0, 0);
284 if(!bisize)
285 goto fail_io;
286 bi = av_malloc(bisize);
287 if(!bi) {
288 vfw_read_close(s);
289 return AVERROR_NOMEM;
290 }
291 ret = SendMessage(ctx->hwnd, WM_CAP_GET_VIDEOFORMAT, bisize, (LPARAM) bi);
292 if(!ret)
293 goto fail_bi;
294
295 dump_bih(s, &bi->bmiHeader);
296
297 width = ap->width ? ap->width : bi->bmiHeader.biWidth ;
298 height = ap->height ? ap->height : bi->bmiHeader.biHeight;
299 bi->bmiHeader.biWidth = width ;
300 bi->bmiHeader.biHeight = height;
301
302 if (0) {
303 /* For testing yet unsupported compressions
304 * Copy these values from user-supplied verbose information */
305 bi->bmiHeader.biWidth = 320;
306 bi->bmiHeader.biHeight = 240;
307 bi->bmiHeader.biPlanes = 1;
308 bi->bmiHeader.biBitCount = 12;
309 bi->bmiHeader.biCompression = MKTAG('I','4','2','0');
310 bi->bmiHeader.biSizeImage = 115200;
311 dump_bih(s, &bi->bmiHeader);
312 }
313
314 ret = SendMessage(ctx->hwnd, WM_CAP_SET_VIDEOFORMAT, bisize, (LPARAM) bi);
315 if(!ret) {
316 av_log(s, AV_LOG_ERROR, "Could not set Video Format.\n");
317 goto fail_bi;
318 }
319
320 biCompression = bi->bmiHeader.biCompression;
321 biBitCount = bi->bmiHeader.biBitCount;
322
323 av_free(bi);
324
325 /* Set sequence setup */
326 ret = SendMessage(ctx->hwnd, WM_CAP_GET_SEQUENCE_SETUP, sizeof(cparms),
327 (LPARAM) &cparms);
328 if(!ret)
329 goto fail_io;
330
331 dump_captureparms(s, &cparms);
332
333 cparms.fYield = 1; // Spawn a background thread
334 cparms.dwRequestMicroSecPerFrame =
335 (ap->time_base.num*1000000) / ap->time_base.den;
336 cparms.fAbortLeftMouse = 0;
337 cparms.fAbortRightMouse = 0;
338 cparms.fCaptureAudio = 0;
339 cparms.vKeyAbort = 0;
340
341 ret = SendMessage(ctx->hwnd, WM_CAP_SET_SEQUENCE_SETUP, sizeof(cparms),
342 (LPARAM) &cparms);
343 if(!ret)
344 goto fail_io;
345
346 codec = st->codec;
347 codec->time_base = ap->time_base;
348 codec->codec_type = CODEC_TYPE_VIDEO;
349 codec->width = width;
350 codec->height = height;
351 codec->pix_fmt = vfw_pixfmt(biCompression, biBitCount);
352 if(codec->pix_fmt == PIX_FMT_NONE) {
353 codec->codec_id = vfw_codecid(biCompression);
354 if(codec->codec_id == CODEC_ID_NONE) {
355 av_log(s, AV_LOG_ERROR, "Unknown compression type. "
356 "Please report verbose (-v 9) debug information.\n");
357 vfw_read_close(s);
358 return AVERROR_PATCHWELCOME;
359 }
360 codec->bits_per_coded_sample = biBitCount;
361 } else {
362 codec->codec_id = CODEC_ID_RAWVIDEO;
363 if(biCompression == BI_RGB)
364 codec->bits_per_coded_sample = biBitCount;
365 }
366
367 av_set_pts_info(st, 32, 1, 1000);
368
369 ctx->mutex = CreateMutex(NULL, 0, NULL);
370 if(!ctx->mutex) {
371 av_log(s, AV_LOG_ERROR, "Could not create Mutex.\n" );
372 goto fail_io;
373 }
374 ctx->event = CreateEvent(NULL, 1, 0, NULL);
375 if(!ctx->event) {
376 av_log(s, AV_LOG_ERROR, "Could not create Event.\n" );
377 goto fail_io;
378 }
379
380 ret = SendMessage(ctx->hwnd, WM_CAP_SEQUENCE_NOFILE, 0, 0);
381 if(!ret) {
382 av_log(s, AV_LOG_ERROR, "Could not start capture sequence.\n" );
383 goto fail_io;
384 }
385
386 return 0;
387
388 fail_bi:
389 av_free(bi);
390
391 fail_io:
392 vfw_read_close(s);
393 return AVERROR_IO;
394 }
395
396 static int vfw_read_packet(AVFormatContext *s, AVPacket *pkt)
397 {
398 struct vfw_ctx *ctx = s->priv_data;
399 AVPacketList *pktl = NULL;
400
401 while(!pktl) {
402 WaitForSingleObject(ctx->mutex, INFINITE);
403 pktl = ctx->pktl;
404 if(ctx->pktl) {
405 *pkt = ctx->pktl->pkt;
406 ctx->pktl = ctx->pktl->next;
407 av_free(pktl);
408 }
409 ResetEvent(ctx->event);
410 ReleaseMutex(ctx->mutex);
411 if(!pktl) {
412 if(s->flags & AVFMT_FLAG_NONBLOCK) {
413 return AVERROR(EAGAIN);
414 } else {
415 WaitForSingleObject(ctx->event, INFINITE);
416 }
417 }
418 }
419
420 ctx->curbufsize -= pkt->size;
421
422 return pkt->size;
423 }
424
425 AVInputFormat vfwcap_demuxer = {
426 "vfwcap",
427 NULL_IF_CONFIG_SMALL("VFW video capture"),
428 sizeof(struct vfw_ctx),
429 NULL,
430 vfw_read_header,
431 vfw_read_packet,
432 vfw_read_close,
433 .flags = AVFMT_NOFILE,
434 };