vfwcap: Support compressed streams.
[libav.git] / libavdevice / vfwcap.c
CommitLineData
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1/*
2 * VFW capture interface
406792e7 3 * Copyright (c) 2006-2008 Ramiro Polla
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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"
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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. */
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30#define HWND_MESSAGE ((HWND)-3)
31
32#define BI_RGB 0
33
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34/* End of missing MinGW defines */
35
36struct 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
46static enum PixelFormat vfw_pixfmt(DWORD biCompression, WORD biBitCount)
47{
48 switch(biCompression) {
49 case MKTAG('Y', 'U', 'Y', '2'):
50 return PIX_FMT_YUYV422;
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51 case MKTAG('I', '4', '2', '0'):
52 return PIX_FMT_YUV420P;
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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;
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70}
71
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72static 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
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81#define dstruct(pctx, sname, var, type) \
82 av_log(pctx, AV_LOG_DEBUG, #var":\t%"type"\n", sname->var)
83
84static 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
113static 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
130static 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
148static 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);
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153 unsigned int buffer_fullness = (ctx->curbufsize*100)/s->max_picture_buffer;
154
d76c3e07 155 if(dropscore[++ctx->frame_num%ndropscores] <= buffer_fullness) {
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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
164static 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;
199fail:
200 ReleaseMutex(ctx->mutex);
201 return FALSE;
202}
203
204static int vfw_read_close(AVFormatContext *s);
205
206static 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;
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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;
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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;
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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
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282#if 0
283 /* For testing yet unsupported compressions
4b1131a0 284 * Copy these values from user-supplied verbose information */
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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
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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;
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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;
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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;
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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) {
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333 codec->codec_id = vfw_codecid(biCompression);
334 if(codec->codec_id == CODEC_ID_NONE) {
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335 av_log(s, AV_LOG_ERROR, "Unknown compression type. "
336 "Please report verbose (-v 9) debug information.\n");
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337 vfw_read_close(s);
338 return AVERROR_PATCHWELCOME;
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339 }
340 codec->bits_per_coded_sample = biBitCount;
c2345207 341 }
1c0b9215 342 else {
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343 codec->codec_id = CODEC_ID_RAWVIDEO;
344 if(biCompression == BI_RGB)
345 codec->bits_per_coded_sample = biBitCount;
1c0b9215 346 }
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347
348 av_set_pts_info(st, 32, 1, 1000);
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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;
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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;
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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;
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365 }
366
367 return 0;
76c2662b 368
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369fail_bi:
370 av_free(bi);
371
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372fail_io:
373 vfw_read_close(s);
374 return AVERROR_IO;
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375}
376
377static 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
406static 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
423AVInputFormat vfwcap_demuxer = {
424 "vfwcap",
bde15e74 425 NULL_IF_CONFIG_SMALL("VFW video capture"),
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426 sizeof(struct vfw_ctx),
427 NULL,
428 vfw_read_header,
429 vfw_read_packet,
430 vfw_read_close,
431 .flags = AVFMT_NOFILE,
432};