x11grab.c 13.6 KB
Newer Older
1 2
/*
 * X11 video grab interface
3
 *
4
 * This file is part of FFmpeg.
5
 *
6 7 8
 * FFmpeg integration:
 * Copyright (C) 2006 Clemens Fruhwirth <clemens@endorphin.org>
 *                    Edouard Gomez <ed.gomez@free.fr>
9
 *
10
 * This file contains code from grab.c:
11
 * Copyright (c) 2000-2001 Fabrice Bellard
12 13
 *
 * This file contains code from the xvidcap project:
14 15
 * Copyright (C) 1997-1998 Rasca, Berlin
 *               2003-2004 Karl H. Beckers, Frankfurt
16
 *
17
 * FFmpeg is free software; you can redistribute it and/or modify
18 19 20 21
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
22
 * FFmpeg is distributed in the hope that it will be useful,
23 24 25 26
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
27 28 29
 * You should have received a copy of the GNU General Public License
 * along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
30
 */
31

Edouard Gomez's avatar
Edouard Gomez committed
32
/**
33
 * @file
Edouard Gomez's avatar
Edouard Gomez committed
34 35 36 37
 * X11 frame device demuxer by Clemens Fruhwirth <clemens@endorphin.org>
 * and Edouard Gomez <ed.gomez@free.fr>.
 */

38 39
#define _XOPEN_SOURCE 600

40
#include "config.h"
41
#include "libavformat/avformat.h"
42 43 44 45 46
#include <time.h>
#include <X11/X.h>
#include <X11/Xlib.h>
#include <X11/Xlibint.h>
#include <X11/Xproto.h>
47
#include <X11/Xutil.h>
48 49
#include <sys/shm.h>
#include <X11/extensions/XShm.h>
Roxis's avatar
Roxis committed
50
#include <X11/extensions/Xfixes.h>
51

Edouard Gomez's avatar
Edouard Gomez committed
52 53 54
/**
 * X11 Device Demuxer context
 */
55
struct x11_grab
56
{
Edouard Gomez's avatar
Edouard Gomez committed
57 58 59 60 61 62 63 64 65 66 67 68 69
    int frame_size;          /**< Size in bytes of a grabbed frame */
    AVRational time_base;    /**< Time base */
    int64_t time_frame;      /**< Current time */

    int height;              /**< Height of the grab frame */
    int width;               /**< Width of the grab frame */
    int x_off;               /**< Horizontal top-left corner coordinate */
    int y_off;               /**< Vertical top-left corner coordinate */

    Display *dpy;            /**< X11 display from which x11grab grabs frames */
    XImage *image;           /**< X11 image holding the grab */
    int use_shm;             /**< !0 when using XShm extension */
    XShmSegmentInfo shminfo; /**< When using XShm, keeps track of XShm infos */
70
    int nomouse;
71
};
Edouard Gomez's avatar
Edouard Gomez committed
72 73

/**
74
 * Initialize the x11 grab device demuxer (public device demuxer API).
Edouard Gomez's avatar
Edouard Gomez committed
75 76 77 78
 *
 * @param s1 Context from avformat core
 * @param ap Parameters from avformat core
 * @return <ul>
79
 *          <li>AVERROR(ENOMEM) no memory left</li>
80
 *          <li>AVERROR(EIO) other failure case</li>
Edouard Gomez's avatar
Edouard Gomez committed
81 82 83
 *          <li>0 success</li>
 *         </ul>
 */
84 85
static int
x11grab_read_header(AVFormatContext *s1, AVFormatParameters *ap)
86
{
87
    struct x11_grab *x11grab = s1->priv_data;
88 89
    Display *dpy;
    AVStream *st = NULL;
90
    enum PixelFormat input_pixfmt;
91
    XImage *image;
Edouard Gomez's avatar
Edouard Gomez committed
92 93
    int x_off = 0;
    int y_off = 0;
94
    int use_shm;
95
    char *param, *offset;
96

97
    param = av_strdup(s1->filename);
98 99 100
    offset = strchr(param, '+');
    if (offset) {
        sscanf(offset, "%d,%d", &x_off, &y_off);
101
        x11grab->nomouse= strstr(offset, "nomouse");
102 103 104
        *offset= 0;
    }

105
    av_log(s1, AV_LOG_INFO, "device: %s -> display: %s x: %d y: %d width: %d height: %d\n", s1->filename, param, x_off, y_off, ap->width, ap->height);
106 107 108 109

    dpy = XOpenDisplay(param);
    if(!dpy) {
        av_log(s1, AV_LOG_ERROR, "Could not open X display.\n");
110
        return AVERROR(EIO);
111
    }
112

113
    if (ap->width <= 0 || ap->height <= 0 || ap->time_base.den <= 0) {
Benoit Fouet's avatar
Benoit Fouet committed
114
        av_log(s1, AV_LOG_ERROR, "AVParameters don't have video size and/or rate. Use -s and -r.\n");
115
        return AVERROR(EIO);
116 117 118 119
    }

    st = av_new_stream(s1, 0);
    if (!st) {
120
        return AVERROR(ENOMEM);
121 122 123 124
    }
    av_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in us */

    use_shm = XShmQueryExtension(dpy);
Edouard Gomez's avatar
Edouard Gomez committed
125
    av_log(s1, AV_LOG_INFO, "shared memory extension %s found\n", use_shm ? "" : "not");
126 127 128 129 130 131 132 133 134 135 136 137 138 139 140

    if(use_shm) {
        int scr = XDefaultScreen(dpy);
        image = XShmCreateImage(dpy,
                                DefaultVisual(dpy, scr),
                                DefaultDepth(dpy, scr),
                                ZPixmap,
                                NULL,
                                &x11grab->shminfo,
                                ap->width, ap->height);
        x11grab->shminfo.shmid = shmget(IPC_PRIVATE,
                                        image->bytes_per_line * image->height,
                                        IPC_CREAT|0777);
        if (x11grab->shminfo.shmid == -1) {
            av_log(s1, AV_LOG_ERROR, "Fatal: Can't get shared memory!\n");
141
            return AVERROR(ENOMEM);
142 143 144 145 146 147 148
        }
        x11grab->shminfo.shmaddr = image->data = shmat(x11grab->shminfo.shmid, 0, 0);
        x11grab->shminfo.readOnly = False;

        if (!XShmAttach(dpy, &x11grab->shminfo)) {
            av_log(s1, AV_LOG_ERROR, "Fatal: Failed to attach shared memory!\n");
            /* needs some better error subroutine :) */
149
            return AVERROR(EIO);
150 151 152 153 154 155 156 157 158 159
        }
    } else {
        image = XGetImage(dpy, RootWindow(dpy, DefaultScreen(dpy)),
                          x_off,y_off,
                          ap->width,ap->height,
                          AllPlanes, ZPixmap);
    }

    switch (image->bits_per_pixel) {
    case 8:
Diego Biurrun's avatar
Diego Biurrun committed
160
        av_log (s1, AV_LOG_DEBUG, "8 bit palette\n");
161 162 163
        input_pixfmt = PIX_FMT_PAL8;
        break;
    case 16:
Edouard Gomez's avatar
Edouard Gomez committed
164 165 166
        if (       image->red_mask   == 0xf800 &&
                   image->green_mask == 0x07e0 &&
                   image->blue_mask  == 0x001f ) {
167 168
            av_log (s1, AV_LOG_DEBUG, "16 bit RGB565\n");
            input_pixfmt = PIX_FMT_RGB565;
Edouard Gomez's avatar
Edouard Gomez committed
169 170 171
        } else if (image->red_mask   == 0x7c00 &&
                   image->green_mask == 0x03e0 &&
                   image->blue_mask  == 0x001f ) {
172 173 174 175 176
            av_log(s1, AV_LOG_DEBUG, "16 bit RGB555\n");
            input_pixfmt = PIX_FMT_RGB555;
        } else {
            av_log(s1, AV_LOG_ERROR, "RGB ordering at image depth %i not supported ... aborting\n", image->bits_per_pixel);
            av_log(s1, AV_LOG_ERROR, "color masks: r 0x%.6lx g 0x%.6lx b 0x%.6lx\n", image->red_mask, image->green_mask, image->blue_mask);
177
            return AVERROR(EIO);
178 179 180
        }
        break;
    case 24:
Edouard Gomez's avatar
Edouard Gomez committed
181 182 183
        if (        image->red_mask   == 0xff0000 &&
                    image->green_mask == 0x00ff00 &&
                    image->blue_mask  == 0x0000ff ) {
184
            input_pixfmt = PIX_FMT_BGR24;
Edouard Gomez's avatar
Edouard Gomez committed
185 186 187
        } else if ( image->red_mask   == 0x0000ff &&
                    image->green_mask == 0x00ff00 &&
                    image->blue_mask  == 0xff0000 ) {
188 189 190 191
            input_pixfmt = PIX_FMT_RGB24;
        } else {
            av_log(s1, AV_LOG_ERROR,"rgb ordering at image depth %i not supported ... aborting\n", image->bits_per_pixel);
            av_log(s1, AV_LOG_ERROR, "color masks: r 0x%.6lx g 0x%.6lx b 0x%.6lx\n", image->red_mask, image->green_mask, image->blue_mask);
192
            return AVERROR(EIO);
193 194 195
        }
        break;
    case 32:
196
#if 0
197
        GetColorInfo (image, &c_info);
Edouard Gomez's avatar
Edouard Gomez committed
198
        if ( c_info.alpha_mask == 0xff000000 && image->green_mask == 0x0000ff00) {
199 200 201 202 203 204 205 206 207
            /* byte order is relevant here, not endianness
             * endianness is handled by avcodec, but atm no such thing
             * as having ABGR, instead of ARGB in a word. Since we
             * need this for Solaris/SPARC, but need to do the conversion
             * for every frame we do it outside of this loop, cf. below
             * this matches both ARGB32 and ABGR32 */
            input_pixfmt = PIX_FMT_ARGB32;
        }  else {
            av_log(s1, AV_LOG_ERROR,"image depth %i not supported ... aborting\n", image->bits_per_pixel);
208
            return AVERROR(EIO);
209
        }
210
#endif
211
        input_pixfmt = PIX_FMT_RGB32;
212 213 214 215 216 217
        break;
    default:
        av_log(s1, AV_LOG_ERROR, "image depth %i not supported ... aborting\n", image->bits_per_pixel);
        return -1;
    }

Edouard Gomez's avatar
Edouard Gomez committed
218
    x11grab->frame_size = ap->width * ap->height * image->bits_per_pixel/8;
219 220 221
    x11grab->dpy = dpy;
    x11grab->width = ap->width;
    x11grab->height = ap->height;
Edouard Gomez's avatar
Edouard Gomez committed
222 223
    x11grab->time_base  = ap->time_base;
    x11grab->time_frame = av_gettime() / av_q2d(ap->time_base);
224 225 226 227 228
    x11grab->x_off = x_off;
    x11grab->y_off = y_off;
    x11grab->image = image;
    x11grab->use_shm = use_shm;

229
    st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
230
    st->codec->codec_id = CODEC_ID_RAWVIDEO;
Edouard Gomez's avatar
Edouard Gomez committed
231 232
    st->codec->width = ap->width;
    st->codec->height = ap->height;
233
    st->codec->pix_fmt = input_pixfmt;
Edouard Gomez's avatar
Edouard Gomez committed
234 235
    st->codec->time_base = ap->time_base;
    st->codec->bit_rate = x11grab->frame_size * 1/av_q2d(ap->time_base) * 8;
236 237

    return 0;
238 239
}

Edouard Gomez's avatar
Edouard Gomez committed
240
/**
241
 * Paint a mouse pointer in an X11 image.
Edouard Gomez's avatar
Edouard Gomez committed
242
 *
Diego Biurrun's avatar
Diego Biurrun committed
243
 * @param image image to paint the mouse pointer to
Edouard Gomez's avatar
Edouard Gomez committed
244 245 246
 * @param s context used to retrieve original grabbing rectangle
 *          coordinates
 */
247
static void
Roxis's avatar
Roxis committed
248
paint_mouse_pointer(XImage *image, struct x11_grab *s)
249
{
250 251 252 253
    int x_off = s->x_off;
    int y_off = s->y_off;
    int width = s->width;
    int height = s->height;
Roxis's avatar
Roxis committed
254 255 256 257 258 259
    Display *dpy = s->dpy;
    XFixesCursorImage *xcim;
    int x, y;
    int line, column;
    int to_line, to_column;
    int image_addr, xcim_addr;
260

Carl Eugen Hoyos's avatar
Carl Eugen Hoyos committed
261
    xcim = XFixesGetCursorImage(dpy);
262

Roxis's avatar
Roxis committed
263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278
    x = xcim->x - xcim->xhot;
    y = xcim->y - xcim->yhot;

    to_line = FFMIN((y + xcim->height), (height + y_off));
    to_column = FFMIN((x + xcim->width), (width + x_off));

    for (line = FFMAX(y, y_off); line < to_line; line++) {
        for (column = FFMAX(x, x_off); column < to_column; column++) {
            xcim_addr = (line - y) * xcim->width + column - x;

            if ((unsigned char)(xcim->pixels[xcim_addr] >> 24) != 0) { // skip fully transparent pixel
                image_addr = ((line - y_off) * width + column - x_off) * 4;

                image->data[image_addr] = (unsigned char)(xcim->pixels[xcim_addr] >> 0);
                image->data[image_addr+1] = (unsigned char)(xcim->pixels[xcim_addr] >> 8);
                image->data[image_addr+2] = (unsigned char)(xcim->pixels[xcim_addr] >> 16);
279
            }
280 281
        }
    }
Roxis's avatar
Roxis committed
282 283 284

    XFree(xcim);
    xcim = NULL;
285 286 287
}


Edouard Gomez's avatar
Edouard Gomez committed
288
/**
289
 * Read new data in the image structure.
Edouard Gomez's avatar
Edouard Gomez committed
290 291
 *
 * @param dpy X11 display to grab from
292
 * @param d
Edouard Gomez's avatar
Edouard Gomez committed
293 294 295 296
 * @param image Image where the grab will be put
 * @param x Top-Left grabbing rectangle horizontal coordinate
 * @param y Top-Left grabbing rectangle vertical coordinate
 * @return 0 if error, !0 if successful
297 298
 */
static int
Edouard Gomez's avatar
Edouard Gomez committed
299
xget_zpixmap(Display *dpy, Drawable d, XImage *image, int x, int y)
300
{
301 302 303 304 305
    xGetImageReply rep;
    xGetImageReq *req;
    long nbytes;

    if (!image) {
Edouard Gomez's avatar
Edouard Gomez committed
306
        return 0;
307 308 309 310 311 312 313 314 315 316 317 318 319 320
    }

    LockDisplay(dpy);
    GetReq(GetImage, req);

    /* First set up the standard stuff in the request */
    req->drawable = d;
    req->x = x;
    req->y = y;
    req->width = image->width;
    req->height = image->height;
    req->planeMask = (unsigned int)AllPlanes;
    req->format = ZPixmap;

Edouard Gomez's avatar
Edouard Gomez committed
321
    if (!_XReply(dpy, (xReply *)&rep, 0, xFalse) || !rep.length) {
322 323
        UnlockDisplay(dpy);
        SyncHandle();
Edouard Gomez's avatar
Edouard Gomez committed
324
        return 0;
325 326 327 328 329 330 331
    }

    nbytes = (long)rep.length << 2;
    _XReadPad(dpy, image->data, nbytes);

    UnlockDisplay(dpy);
    SyncHandle();
Edouard Gomez's avatar
Edouard Gomez committed
332
    return 1;
333 334
}

Edouard Gomez's avatar
Edouard Gomez committed
335
/**
336
 * Grab a frame from x11 (public device demuxer API).
Edouard Gomez's avatar
Edouard Gomez committed
337 338 339 340 341
 *
 * @param s1 Context from avformat core
 * @param pkt Packet holding the brabbed frame
 * @return frame size in bytes
 */
342 343
static int
x11grab_read_packet(AVFormatContext *s1, AVPacket *pkt)
344
{
345
    struct x11_grab *s = s1->priv_data;
346 347 348 349 350 351 352 353 354
    Display *dpy = s->dpy;
    XImage *image = s->image;
    int x_off = s->x_off;
    int y_off = s->y_off;

    int64_t curtime, delay;
    struct timespec ts;

    /* Calculate the time of the next frame */
355
    s->time_frame += INT64_C(1000000);
356 357 358 359

    /* wait based on the frame rate */
    for(;;) {
        curtime = av_gettime();
Edouard Gomez's avatar
Edouard Gomez committed
360
        delay = s->time_frame * av_q2d(s->time_base) - curtime;
361
        if (delay <= 0) {
362 363
            if (delay < INT64_C(-1000000) * av_q2d(s->time_base)) {
                s->time_frame += INT64_C(1000000);
364 365 366 367 368 369 370 371 372
            }
            break;
        }
        ts.tv_sec = delay / 1000000;
        ts.tv_nsec = (delay % 1000000) * 1000;
        nanosleep(&ts, NULL);
    }

    if (av_new_packet(pkt, s->frame_size) < 0) {
373
        return AVERROR(EIO);
374 375
    }

Edouard Gomez's avatar
Edouard Gomez committed
376
    pkt->pts = curtime;
377 378 379 380 381 382

    if(s->use_shm) {
        if (!XShmGetImage(dpy, RootWindow(dpy, DefaultScreen(dpy)), image, x_off, y_off, AllPlanes)) {
            av_log (s1, AV_LOG_INFO, "XShmGetImage() failed\n");
        }
    } else {
Edouard Gomez's avatar
Edouard Gomez committed
383
        if (!xget_zpixmap(dpy, RootWindow(dpy, DefaultScreen(dpy)), image, x_off, y_off)) {
384 385 386 387
            av_log (s1, AV_LOG_INFO, "XGetZPixmap() failed\n");
        }
    }

388
    if(!s->nomouse){
Roxis's avatar
Roxis committed
389
        paint_mouse_pointer(image, s);
390 391 392 393 394 395
    }


    /* XXX: avoid memcpy */
    memcpy(pkt->data, image->data, s->frame_size);
    return s->frame_size;
396 397
}

Edouard Gomez's avatar
Edouard Gomez committed
398
/**
399
 * Close x11 frame grabber (public device demuxer API).
Edouard Gomez's avatar
Edouard Gomez committed
400 401 402 403
 *
 * @param s1 Context from avformat core
 * @return 0 success, !0 failure
 */
404 405
static int
x11grab_read_close(AVFormatContext *s1)
406
{
407
    struct x11_grab *x11grab = s1->priv_data;
408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424

    /* Detach cleanly from shared mem */
    if (x11grab->use_shm) {
        XShmDetach(x11grab->dpy, &x11grab->shminfo);
        shmdt(x11grab->shminfo.shmaddr);
        shmctl(x11grab->shminfo.shmid, IPC_RMID, NULL);
    }

    /* Destroy X11 image */
    if (x11grab->image) {
        XDestroyImage(x11grab->image);
        x11grab->image = NULL;
    }

    /* Free X11 display */
    XCloseDisplay(x11grab->dpy);
    return 0;
425 426
}

Edouard Gomez's avatar
Edouard Gomez committed
427
/** x11 grabber device demuxer declaration */
428 429
AVInputFormat x11_grab_device_demuxer =
{
430
    "x11grab",
431
    NULL_IF_CONFIG_SMALL("X11grab"),
432
    sizeof(struct x11_grab),
433 434 435 436 437
    NULL,
    x11grab_read_header,
    x11grab_read_packet,
    x11grab_read_close,
    .flags = AVFMT_NOFILE,
438
};