2 * VFW capture interface
3 * Copyright (c) 2006-2008 Ramiro Polla
5 * This file is part of FFmpeg.
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.
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.
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
22 #include "libavformat/avformat.h"
28 /* Defines for VFW missing from MinGW.
29 * Remove this when MinGW incorporates them. */
30 #define HWND_MESSAGE ((HWND)-3)
34 /* End of missing MinGW defines */
42 unsigned int curbufsize;
43 unsigned int frame_num;
46 static enum PixelFormat vfw_pixfmt(DWORD biCompression, WORD biBitCount)
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;
54 switch(biBitCount) { /* 1-8 are untested */
56 return PIX_FMT_MONOWHITE;
62 return PIX_FMT_RGB555;
72 #define dstruct(pctx, sname, var, type) \
73 av_log(pctx, AV_LOG_DEBUG, #var":\t%"type"\n", sname->var)
75 static void dump_captureparms(AVFormatContext *s, CAPTUREPARMS *cparms)
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");
104 static void dump_videohdr(AVFormatContext *s, VIDEOHDR *vhdr)
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");
121 static void dump_bih(AVFormatContext *s, BITMAPINFOHEADER *bih)
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");
139 static int shall_we_drop(struct vfw_ctx *ctx)
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;
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);
155 static LRESULT CALLBACK videostream_cb(HWND hwnd, LPVIDEOHDR vdhdr)
158 AVPacketList **ppktl, *pktl_next;
160 ctx = (struct vfw_ctx *) GetWindowLongPtr(hwnd, GWLP_USERDATA);
162 dump_videohdr(ctx->s, vdhdr);
164 if(shall_we_drop(ctx))
167 WaitForSingleObject(ctx->mutex, INFINITE);
169 pktl_next = av_mallocz(sizeof(AVPacketList));
173 if(av_new_packet(&pktl_next->pkt, vdhdr->dwBytesUsed) < 0) {
178 pktl_next->pkt.pts = vdhdr->dwTimeCaptured;
179 memcpy(pktl_next->pkt.data, vdhdr->lpData, vdhdr->dwBytesUsed);
181 for(ppktl = &ctx->pktl ; *ppktl ; ppktl = &(*ppktl)->next);
184 ctx->curbufsize += vdhdr->dwBytesUsed;
186 SetEvent(ctx->event);
187 ReleaseMutex(ctx->mutex);
191 ReleaseMutex(ctx->mutex);
195 static int vfw_read_close(AVFormatContext *s);
197 static int vfw_read_header(AVFormatContext *s, AVFormatParameters *ap)
199 struct vfw_ctx *ctx = s->priv_data;
200 AVCodecContext *codec;
212 if(!ap->time_base.den) {
213 av_log(s, AV_LOG_ERROR, "A time base must be specified.\n");
219 ctx->hwnd = capCreateCaptureWindow(NULL, 0, 0, 0, 0, 0, HWND_MESSAGE, 0);
221 av_log(s, AV_LOG_ERROR, "Could not create capture window.\n");
225 /* If atoi fails, devnum==0 and the default device is used */
226 devnum = atoi(s->filename);
228 ret = SendMessage(ctx->hwnd, WM_CAP_DRIVER_CONNECT, devnum, 0);
230 av_log(s, AV_LOG_ERROR, "Could not connect to device.\n");
231 DestroyWindow(ctx->hwnd);
232 return AVERROR(ENODEV);
235 SendMessage(ctx->hwnd, WM_CAP_SET_OVERLAY, 0, 0);
236 SendMessage(ctx->hwnd, WM_CAP_SET_PREVIEW, 0, 0);
238 ret = SendMessage(ctx->hwnd, WM_CAP_SET_CALLBACK_VIDEOSTREAM, 0,
239 (LPARAM) videostream_cb);
241 av_log(s, AV_LOG_ERROR, "Could not set video stream callback.\n");
245 SetWindowLongPtr(ctx->hwnd, GWLP_USERDATA, (LONG_PTR) ctx);
247 st = av_new_stream(s, 0);
250 return AVERROR_NOMEM;
253 /* Set video format */
254 bisize = SendMessage(ctx->hwnd, WM_CAP_GET_VIDEOFORMAT, 0, 0);
257 bi = av_malloc(bisize);
260 return AVERROR_NOMEM;
262 ret = SendMessage(ctx->hwnd, WM_CAP_GET_VIDEOFORMAT, bisize, (LPARAM) bi);
266 dump_bih(s, &bi->bmiHeader);
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;
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);
285 ret = SendMessage(ctx->hwnd, WM_CAP_SET_VIDEOFORMAT, bisize, (LPARAM) bi);
287 av_log(s, AV_LOG_ERROR, "Could not set Video Format.\n");
291 biCompression = bi->bmiHeader.biCompression;
292 biBitCount = bi->bmiHeader.biBitCount;
296 /* Set sequence setup */
297 ret = SendMessage(ctx->hwnd, WM_CAP_GET_SEQUENCE_SETUP, sizeof(cparms),
302 dump_captureparms(s, &cparms);
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;
312 ret = SendMessage(ctx->hwnd, WM_CAP_SET_SEQUENCE_SETUP, sizeof(cparms),
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;
327 av_set_pts_info(st, 32, 1, 1000);
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");
333 return AVERROR_PATCHWELCOME;
336 ctx->mutex = CreateMutex(NULL, 0, NULL);
338 av_log(s, AV_LOG_ERROR, "Could not create Mutex.\n" );
341 ctx->event = CreateEvent(NULL, 1, 0, NULL);
343 av_log(s, AV_LOG_ERROR, "Could not create Event.\n" );
347 ret = SendMessage(ctx->hwnd, WM_CAP_SEQUENCE_NOFILE, 0, 0);
349 av_log(s, AV_LOG_ERROR, "Could not start capture sequence.\n" );
363 static int vfw_read_packet(AVFormatContext *s, AVPacket *pkt)
365 struct vfw_ctx *ctx = s->priv_data;
366 AVPacketList *pktl = NULL;
369 WaitForSingleObject(ctx->mutex, INFINITE);
372 *pkt = ctx->pktl->pkt;
373 ctx->pktl = ctx->pktl->next;
376 ResetEvent(ctx->event);
377 ReleaseMutex(ctx->mutex);
379 if(s->flags & AVFMT_FLAG_NONBLOCK) {
380 return AVERROR(EAGAIN);
382 WaitForSingleObject(ctx->event, INFINITE);
387 ctx->curbufsize -= pkt->size;
392 static int vfw_read_close(AVFormatContext *s)
394 struct vfw_ctx *ctx = s->priv_data;
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);
402 CloseHandle(ctx->mutex);
404 CloseHandle(ctx->event);
409 AVInputFormat vfwcap_demuxer = {
411 NULL_IF_CONFIG_SMALL("VFW video capture"),
412 sizeof(struct vfw_ctx),
417 .flags = AVFMT_NOFILE,