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e519b02c10
ffmpeg/libavformat/x11grab.c
Guillaume Poirier e519b02c10 Original X11 device demuxer patch from Clemens Fruhwirth 
- Build system integration is equivalent to RFC #6 patch
- Same rule applies to ffmpeg.c/allformats.[c|h]
- x11grab.c is from Clemens Fruhwirth except the x11 grab
  structure for libavformat registration is renamed to
  match build system integration.

Originally committed as revision 7293 to svn://svn.ffmpeg.org/ffmpeg/trunk
2006-12-12 22:31:46 +00:00

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/*
* X11 video grab interface
* Copyright (c) 2006 Clemens Fruhwirth
*
* A quick note on licensing. This file is a mixture of LGPL code
* (ffmpeg) and GPL code (xvidcap). The result is a file that must
* abid both licenses. As they are compatible and GPL is more
* strict, this code has an "effective" GPL license.
*
* This file contains code from grab.c:
* Copyright (c) 2000,2001 Fabrice Bellard
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* This file contains code from the xvidcap project:
* Copyright (C) 1997-98 Rasca, Berlin
* Copyright (C) 2003,04 Karl H. Beckers, Frankfurt
*
* This program is free software; you can redistribute it and/or modify
* 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.
*
* This program is distributed in the hope that it will be useful,
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "avformat.h"
#include <unistd.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/time.h>
#define _LINUX_TIME_H 1
#include <time.h>
#include <X11/X.h>
#include <X11/Xlib.h>
#include <X11/Xlibint.h>
#include <X11/Xproto.h>
#include <X11/Xutil.h>
#include <sys/ipc.h>
#include <sys/shm.h>
#include <X11/extensions/XShm.h>
typedef struct {
Display *dpy;
int frame_format;
int frame_size;
int frame_rate;
int frame_rate_base;
int64_t time_frame;
int height;
int width;
int x_off;
int y_off;
XImage *image;
int use_shm;
XShmSegmentInfo shminfo;
int mouse_wanted;
} X11Grab;
static int x11grab_read_header(AVFormatContext *s1, AVFormatParameters *ap)
{
X11Grab *x11grab=s1->priv_data;
Display *dpy;
AVStream *st;
int width, height;
int frame_rate, frame_rate_base, frame_size;
int input_pixfmt;
XImage *image;
int x_off=0; int y_off = 0;
char *device_parsing = strdup(ap->device);
int use_shm;
dpy = XOpenDisplay(NULL);
if(!dpy)
goto fail;
sscanf(device_parsing,"x11:%d,%d",&x_off, &y_off);
fprintf(stderr,"device: %s -> x: %d y: %d width: %d height: %d\n", ap->device, x_off, y_off, ap->width, ap->height);
if (!ap || ap->width <= 0 || ap->height <= 0 || ap->time_base.den <= 0) {
fprintf(stderr,"x11grab: AVParameters don't have any video size. Use -s.\n");
return AVERROR_IO;
}
width = ap->width;
height = ap->height;
frame_rate = ap->time_base.den;
frame_rate_base = ap->time_base.num;
st = av_new_stream(s1, 0);
if (!st)
return -ENOMEM;
av_set_pts_info(st, 48, 1, 1000000); /* 48 bits pts in us */
use_shm = XShmQueryExtension(dpy);
fprintf(stderr,"x11grab: shared memory extension %s\n",use_shm?"found":"not found");
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) {
fprintf(stderr,"Fatal: Can't get shared memory!\n");
return -ENOMEM;
}
x11grab->shminfo.shmaddr = image->data = shmat(x11grab->shminfo.shmid, 0, 0);
x11grab->shminfo.readOnly = False;
if (XShmAttach(dpy, &x11grab->shminfo) == 0) {
fprintf(stderr,"Fatal: Failed to attach shared memory!\n");
/* needs some better error subroutine :) */
return AVERROR_IO;
}
}
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:
fprintf (stderr, "x11grab: 8 bit pallete\n");
input_pixfmt = PIX_FMT_PAL8;
break;
case 16:
if ( image->red_mask == 0xF800 && image->green_mask == 0x07E0
&& image->blue_mask == 0x1F ) {
fprintf (stderr, "x11grab: 16 bit RGB565\n");
input_pixfmt = PIX_FMT_RGB565;
} else if ( image->red_mask == 0x7C00 &&
image->green_mask == 0x03E0 &&
image->blue_mask == 0x1F ) {
fprintf (stderr, "x11grab: 16 bit RGB555\n");
input_pixfmt = PIX_FMT_RGB555;
} else {
fprintf (stderr, "x11grab: RGB ordering at image depth %i not supported ... aborting\n", image->bits_per_pixel);
fprintf (stderr, "x11grab: color masks: r 0x%.6X g 0x%.6X b 0x%.6X\n", image->red_mask, image->green_mask, image->blue_mask);
return AVERROR_IO;
}
break;
case 24:
if ( image->red_mask == 0xFF0000 &&
image->green_mask == 0xFF00
&& image->blue_mask == 0xFF ) {
input_pixfmt = PIX_FMT_BGR24;
} else if ( image->red_mask == 0xFF && image->green_mask == 0xFF00
&& image->blue_mask == 0xFF0000 ) {
input_pixfmt = PIX_FMT_RGB24;
} else {
fprintf (stderr, "xtoffmpeg.XImageToFFMPEG(): rgb ordering at image depth %i not supported ... aborting\n", image->bits_per_pixel);
fprintf (stderr, "xtoffmpeg.XImageToFFMPEG(): color masks: r 0x%.6X g 0x%.6X b 0x%.6X\n", image->red_mask, image->green_mask, image->blue_mask);
return AVERROR_IO;
}
break;
case 32:
#if 0
GetColorInfo (image, &c_info);
if ( c_info.alpha_mask == 0xFF000000 && image->green_mask == 0xFF00 ) {
// 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 {
fprintf (stderr, "xtoffmpeg.XImageToFFMPEG(): image depth %i not supported ... aborting\n", image->bits_per_pixel);
return AVERROR_IO;
}
#endif
input_pixfmt = PIX_FMT_RGBA32;
break;
default:
fprintf (stderr, "xtoffmpeg.XImageToFFMPEG(): image depth %i not supported ... aborting\n", image->bits_per_pixel);
return -1;
}
frame_size = width * height * image->bits_per_pixel/8;
x11grab->frame_size = frame_size;
x11grab->dpy = dpy;
x11grab->width = ap->width;
x11grab->height = ap->height;
x11grab->frame_rate = frame_rate;
x11grab->frame_rate_base = frame_rate_base;
x11grab->time_frame = av_gettime() * frame_rate / frame_rate_base;
x11grab->x_off = x_off;
x11grab->y_off = y_off;
x11grab->image = image;
x11grab->use_shm = use_shm;
x11grab->mouse_wanted = 1;
st->codec->codec_type = CODEC_TYPE_VIDEO;
st->codec->codec_id = CODEC_ID_RAWVIDEO;
st->codec->width = width;
st->codec->height = height;
st->codec->pix_fmt = input_pixfmt;
st->codec->time_base.den = frame_rate;
st->codec->time_base.num = frame_rate_base;
st->codec->bit_rate = frame_size * 1/av_q2d(st->codec->time_base) * 8;
return 0;
fail:
av_free(st);
av_free(device_parsing);
return AVERROR_IO;
}
uint16_t mousePointerBlack[] = { 0, 49152, 40960, 36864, 34816, 33792, 33280, 33024, 32896, 32832,
33728, 37376, 43264, 51456, 1152, 1152, 576, 576, 448, 0 };
uint16_t mousePointerWhite[] = { 0, 0, 16384, 24576, 28672, 30720, 31744, 32256, 32512, 32640, 31744,
27648, 17920, 1536, 768, 768, 384, 384, 0, 0 };
static void getCurrentPointer(X11Grab *s, int *x, int *y) {
Window mrootwindow, childwindow;
int dummy;
Display *dpy = s->dpy;
mrootwindow = DefaultRootWindow(dpy);
if (XQueryPointer(dpy, mrootwindow, &mrootwindow, &childwindow,
x, y, &dummy, &dummy, &dummy)) {
} else {
fprintf(stderr,"couldn't find mouse pointer\n");
*x = -1;
*y = -1;
}
}
static void paintMousePointer(X11Grab *s, int *x, int *y, XImage *image) {
int x_off = s->x_off;
int y_off = s->y_off;
int width = s->width;
int height = s->height;
if ((*x - x_off) >= 0 &&
*x < (width + x_off) &&
(*y - y_off) >= 0 &&
*y < (height + y_off) ) {
int line;
uint8_t *im_data = image->data;
im_data += (image->bytes_per_line * (*y - y_off)); // shift to right line
im_data += (image->bits_per_pixel / 8 * (*x - x_off)); // shift to right pixel
switch(image->bits_per_pixel) {
case 32:
{
uint32_t *cursor;
int width_cursor;
uint16_t bm_b, bm_w, mask;
for (line = 0; line < 20; line++ ) {
if (s->mouse_wanted == 1) {
bm_b = mousePointerBlack[line];
bm_w = mousePointerWhite[line];
} else {
bm_b = mousePointerWhite[line];
bm_w = mousePointerBlack[line];
}
mask = ( 0x0001 << 15 );
for (cursor = (uint32_t*) im_data, width_cursor = 0;
((width_cursor + *x) < (width + x_off) && width_cursor < 16);
cursor++, width_cursor++) {
// Boolean pointer_b_bit, pointer_w_bit;
// pointer_b_bit = ( ( bm_b & mask ) > 0 );
// pointer_w_bit = ( ( bm_w & mask ) > 0 );
// printf("%i ", pointer_b_bit, pointer_w_bit );
if ( ( bm_b & mask ) > 0 ) {
*cursor &= ((~ image->red_mask) & (~ image->green_mask) & (~image->blue_mask ));
} else if ( ( bm_w & mask ) > 0 ) {
*cursor |= (image->red_mask | image->green_mask | image->blue_mask );
}
mask >>= 1;
}
// printf("\n");
im_data += image->bytes_per_line;
}
}
break;
#if 0
case 24: // not sure this can occur at all ..........
fprintf(stderr,"input image bits_per_pixel %i not implemented with mouse pointer capture ... aborting!\n",
image->bits_per_pixel);
fprintf(stderr,"Please file a bug at http://www.sourceforge.net/projects/xvidcap/\n");
exit(1);
break;
case 16: {
uint16_t *cursor;
int width;
uint16_t bm_b, bm_w, mask;
for (line = 0; line < 16; line++ ) {
if (mjob->mouseWanted == 1) {
bm_b = mousePointerBlack[line];
bm_w = mousePointerWhite[line];
} else {
bm_b = mousePointerWhite[line];
bm_w = mousePointerBlack[line];
}
mask = ( 0x0001 << 15 );
for (cursor = (uint16_t*) im_data, width = 0;
((width + *x) < (mjob->area->width + mjob->area->x)&&width < 6);
cursor++, width++) {
// Boolean pointer_b_bit, pointer_w_bit;
// pointer_b_bit = ( ( bm_b & mask ) > 0 );
// pointer_w_bit = ( ( bm_w & mask ) > 0 );
// printf("%i ", pointer_b_bit, pointer_w_bit );
if ( ( bm_b & mask ) > 0 ) {
*cursor &= ((~ image->red_mask) & (~ image->green_mask) & (~
image->blue_mask ));
} else if ( ( bm_w & mask ) > 0 ) {
*cursor |= (image->red_mask | image->green_mask | image->blue_mask );
}
mask >>= 1;
}
// printf("\n");
im_data += image->bytes_per_line;
}
}
break;
case 8: {
uint8_t *cursor;
int width;
uint16_t bm_b, bm_w, mask;
for (line = 0; line < 16; line++ ) {
if (mjob->mouseWanted == 1) {
bm_b = mousePointerBlack[line];
bm_w = mousePointerWhite[line];
} else {
bm_b = mousePointerWhite[line];
bm_w = mousePointerBlack[line];
}
mask = ( 0x0001 << 15 );
for (cursor = im_data, width = 0;
((width + *x) < (mjob->area->width + mjob->area->x)&&width < 6);
cursor++, width++) {
// Boolean pointer_b_bit, pointer_w_bit;
// pointer_b_bit = ( ( bm_b & mask ) > 0 );
// pointer_w_bit = ( ( bm_w & mask ) > 0 );
// printf("%i ", pointer_b_bit, pointer_w_bit );
if ( ( bm_b & mask ) > 0 ) {
*cursor = 0;
} else if ( ( bm_w & mask ) > 0 ) {
*cursor = 1;
}
mask >>= 1;
}
// printf("\n");
im_data += image->bytes_per_line;
}
}
break;
default:
fprintf(stderr,"input image bits_per_pixel %i not supported with mouse pointer capture ... aborting!\n",
image->bits_per_pixel);
exit(1);
#endif
}
}
}
/*
* just read new data in the image structure, the image
* structure inclusive the data area must be allocated before
*/
static int
XGetZPixmap(Display *dpy, Drawable d, XImage *image, int x, int y)
{
xGetImageReply rep;
xGetImageReq *req;
long nbytes;
if (!image)
return (False);
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 = AllPlanes;
req->format = ZPixmap;
if (_XReply(dpy, (xReply *) &rep, 0, xFalse) == 0 ||
rep.length == 0) {
UnlockDisplay(dpy);
SyncHandle();
return (False);
}
nbytes = (long)rep.length << 2;
_XReadPad(dpy, image->data, nbytes);
UnlockDisplay(dpy);
SyncHandle();
return (True);
}
static int
x11grab_read_packet(AVFormatContext *s1, AVPacket *pkt)
{
X11Grab *s = s1->priv_data;
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 */
s->time_frame += int64_t_C(1000000);
/* wait based on the frame rate */
for(;;) {
curtime = av_gettime();
delay = s->time_frame * s->frame_rate_base / s->frame_rate - curtime;
if (delay <= 0) {
if (delay < int64_t_C(-1000000) * s->frame_rate_base / s->frame_rate) {
/* printf("grabbing is %d frames late (dropping)\n", (int) -(delay / 16666)); */
s->time_frame += int64_t_C(1000000);
}
break;
}
ts.tv_sec = delay / 1000000;
ts.tv_nsec = (delay % 1000000) * 1000;
nanosleep(&ts, NULL);
}
if (av_new_packet(pkt, s->frame_size) < 0)
return AVERROR_IO;
pkt->pts = curtime & ((1LL << 48) - 1);
if(s->use_shm) {
if (!XShmGetImage(dpy,
RootWindow(dpy, DefaultScreen(dpy)),
image, x_off, y_off, AllPlanes)) {
fprintf(stderr,"XShmGetImage() failed\n");
}
}
else {
XGetZPixmap(dpy,
RootWindow(dpy, DefaultScreen(dpy)),
image, x_off, y_off);
};
{
int pointer_x, pointer_y;
getCurrentPointer(s, &pointer_x, &pointer_y);
paintMousePointer(s, &pointer_x, &pointer_y, image);
}
#warning FIXME - avoid memcpy
memcpy(pkt->data, image->data, s->frame_size);
return s->frame_size;
}
static int
x11grab_read_close(AVFormatContext *s1)
{
X11Grab *x11grab = s1->priv_data;
XCloseDisplay(x11grab->dpy);
return 0;
}
AVInputFormat x11_grab_device_demuxer = {
"x11grab",
"X11grab",
sizeof(X11Grab),
NULL,
x11grab_read_header,
x11grab_read_packet,
x11grab_read_close,
.flags = AVFMT_NOFILE,
};
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