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ffmpeg/libavdevice/x11grab.c

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/*
* X11 video grab interface
*
* This file is part of FFmpeg.
*
* FFmpeg integration:
* Copyright (C) 2006 Clemens Fruhwirth <clemens@endorphin.org>
* Edouard Gomez <ed.gomez@free.fr>
*
* This file contains code from grab.c:
* Copyright (c) 2000-2001 Fabrice Bellard
*
* This file contains code from the xvidcap project:
* Copyright (C) 1997-1998 Rasca, Berlin
* 2003-2004 Karl H. Beckers, Frankfurt
*
* FFmpeg 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.
*
* FFmpeg 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 FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file libavdevice/x11grab.c
* X11 frame device demuxer by Clemens Fruhwirth <clemens@endorphin.org>
* and Edouard Gomez <ed.gomez@free.fr>.
*/
#include "config.h"
#include "libavformat/avformat.h"
#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/shm.h>
#include <X11/extensions/XShm.h>
/**
* X11 Device Demuxer context
*/
struct x11_grab
{
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 */
int mouse_warning_shown;
};
/**
* Initializes the x11 grab device demuxer (public device demuxer API).
*
* @param s1 Context from avformat core
* @param ap Parameters from avformat core
* @return <ul>
* <li>AVERROR(ENOMEM) no memory left</li>
* <li>AVERROR(EIO) other failure case</li>
* <li>0 success</li>
* </ul>
*/
static int
x11grab_read_header(AVFormatContext *s1, AVFormatParameters *ap)
{
struct x11_grab *x11grab = s1->priv_data;
Display *dpy;
AVStream *st = NULL;
int input_pixfmt;
XImage *image;
int x_off = 0;
int y_off = 0;
int use_shm;
char *param, *offset;
param = av_strdup(s1->filename);
offset = strchr(param, '+');
if (offset) {
sscanf(offset, "%d,%d", &x_off, &y_off);
*offset= 0;
}
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);
dpy = XOpenDisplay(param);
if(!dpy) {
av_log(s1, AV_LOG_ERROR, "Could not open X display.\n");
return AVERROR(EIO);
}
if (!ap || ap->width <= 0 || ap->height <= 0 || ap->time_base.den <= 0) {
av_log(s1, AV_LOG_ERROR, "AVParameters don't have video size and/or rate. Use -s and -r.\n");
return AVERROR(EIO);
}
st = av_new_stream(s1, 0);
if (!st) {
return AVERROR(ENOMEM);
}
av_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in us */
use_shm = XShmQueryExtension(dpy);
av_log(s1, AV_LOG_INFO, "shared memory extension %s found\n", use_shm ? "" : "not");
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");
return AVERROR(ENOMEM);
}
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 :) */
return AVERROR(EIO);
}
} 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:
av_log (s1, AV_LOG_DEBUG, "8 bit palette\n");
input_pixfmt = PIX_FMT_PAL8;
break;
case 16:
if ( image->red_mask == 0xf800 &&
image->green_mask == 0x07e0 &&
image->blue_mask == 0x001f ) {
av_log (s1, AV_LOG_DEBUG, "16 bit RGB565\n");
input_pixfmt = PIX_FMT_RGB565;
} else if (image->red_mask == 0x7c00 &&
image->green_mask == 0x03e0 &&
image->blue_mask == 0x001f ) {
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);
return AVERROR(EIO);
}
break;
case 24:
if ( image->red_mask == 0xff0000 &&
image->green_mask == 0x00ff00 &&
image->blue_mask == 0x0000ff ) {
input_pixfmt = PIX_FMT_BGR24;
} else if ( image->red_mask == 0x0000ff &&
image->green_mask == 0x00ff00 &&
image->blue_mask == 0xff0000 ) {
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);
return AVERROR(EIO);
}
break;
case 32:
#if 0
GetColorInfo (image, &c_info);
if ( c_info.alpha_mask == 0xff000000 && image->green_mask == 0x0000ff00) {
/* 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);
return AVERROR(EIO);
}
#endif
input_pixfmt = PIX_FMT_RGB32;
break;
default:
av_log(s1, AV_LOG_ERROR, "image depth %i not supported ... aborting\n", image->bits_per_pixel);
return -1;
}
x11grab->frame_size = ap->width * ap->height * image->bits_per_pixel/8;
x11grab->dpy = dpy;
x11grab->width = ap->width;
x11grab->height = ap->height;
x11grab->time_base = ap->time_base;
x11grab->time_frame = av_gettime() / av_q2d(ap->time_base);
x11grab->x_off = x_off;
x11grab->y_off = y_off;
x11grab->image = image;
x11grab->use_shm = use_shm;
x11grab->mouse_warning_shown = 0;
st->codec->codec_type = CODEC_TYPE_VIDEO;
st->codec->codec_id = CODEC_ID_RAWVIDEO;
st->codec->width = ap->width;
st->codec->height = ap->height;
st->codec->pix_fmt = input_pixfmt;
st->codec->time_base = ap->time_base;
st->codec->bit_rate = x11grab->frame_size * 1/av_q2d(ap->time_base) * 8;
return 0;
}
/**
* Get pointer coordinates from X11.
*
* @param x Integer where horizontal coordinate will be returned
* @param y Integer where vertical coordinate will be returned
* @param dpy X11 display from where pointer coordinates are retrieved
* @param s1 Context used for logging errors if necessary
*/
static void
get_pointer_coordinates(int *x, int *y, Display *dpy, AVFormatContext *s1)
{
Window mrootwindow, childwindow;
int dummy;
mrootwindow = DefaultRootWindow(dpy);
if (XQueryPointer(dpy, mrootwindow, &mrootwindow, &childwindow,
x, y, &dummy, &dummy, (unsigned int*)&dummy)) {
} else {
struct x11_grab *s = s1->priv_data;
if (!s->mouse_warning_shown) {
av_log(s1, AV_LOG_INFO, "couldn't find mouse pointer\n");
s->mouse_warning_shown = 1;
}
*x = -1;
*y = -1;
}
}
/**
* Mouse painting helper function that applies an 'and' and 'or' mask pair to
* '*dst' pixel. It actually draws a mouse pointer pixel to grabbed frame.
*
* @param dst Destination pixel
* @param and Part of the mask that must be applied using a bitwise 'and'
* operator
* @param or Part of the mask that must be applied using a bitwise 'or'
* operator
* @param bits_per_pixel Bits per pixel used in the grabbed image
*/
static void inline
apply_masks(uint8_t *dst, int and, int or, int bits_per_pixel)
{
switch (bits_per_pixel) {
case 32:
*(uint32_t*)dst = (*(uint32_t*)dst & and) | or;
break;
case 16:
*(uint16_t*)dst = (*(uint16_t*)dst & and) | or;
break;
case 8:
*dst = !!or;
break;
}
}
/**
* Paints a mouse pointer in an X11 image.
*
* @param image image to paint the mouse pointer to
* @param s context used to retrieve original grabbing rectangle
* coordinates
* @param x Mouse pointer coordinate
* @param y Mouse pointer coordinate
*/
static void
paint_mouse_pointer(XImage *image, struct x11_grab *s, int x, int y)
{
/* 16x20x1bpp bitmap for the black channel of the mouse pointer */
static const uint16_t const mousePointerBlack[] =
{
0x0000, 0x0003, 0x0005, 0x0009, 0x0011,
0x0021, 0x0041, 0x0081, 0x0101, 0x0201,
0x03c1, 0x0049, 0x0095, 0x0093, 0x0120,
0x0120, 0x0240, 0x0240, 0x0380, 0x0000
};
/* 16x20x1bpp bitmap for the white channel of the mouse pointer */
static const uint16_t const mousePointerWhite[] =
{
0x0000, 0x0000, 0x0002, 0x0006, 0x000e,
0x001e, 0x003e, 0x007e, 0x00fe, 0x01fe,
0x003e, 0x0036, 0x0062, 0x0060, 0x00c0,
0x00c0, 0x0180, 0x0180, 0x0000, 0x0000
};
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) {
uint8_t *im_data = (uint8_t*)image->data;
int bytes_per_pixel;
int line;
int masks;
/* Select correct masks and pixel size */
if (image->bits_per_pixel == 8) {
masks = 1;
} else {
masks = (image->red_mask|image->green_mask|image->blue_mask);
}
bytes_per_pixel = image->bits_per_pixel>>3;
/* Shift to right line */
im_data += image->bytes_per_line * (y - y_off);
/* Shift to right pixel in the line */
im_data += bytes_per_pixel * (x - x_off);
/* Draw the cursor - proper loop */
for (line = 0; line < FFMIN(20, (y_off + height) - y); line++) {
uint8_t *cursor = im_data;
int column;
uint16_t bm_b;
uint16_t bm_w;
bm_b = mousePointerBlack[line];
bm_w = mousePointerWhite[line];
for (column = 0; column < FFMIN(16, (x_off + width) - x); column++) {
apply_masks(cursor, ~(masks*(bm_b&1)), masks*(bm_w&1),
image->bits_per_pixel);
cursor += bytes_per_pixel;
bm_b >>= 1;
bm_w >>= 1;
}
im_data += image->bytes_per_line;
}
}
}
/**
* Reads new data in the image structure.
*
* @param dpy X11 display to grab from
* @param d
* @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
*/
static int
xget_zpixmap(Display *dpy, Drawable d, XImage *image, int x, int y)
{
xGetImageReply rep;
xGetImageReq *req;
long nbytes;
if (!image) {
return 0;
}
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;
if (!_XReply(dpy, (xReply *)&rep, 0, xFalse) || !rep.length) {
UnlockDisplay(dpy);
SyncHandle();
return 0;
}
nbytes = (long)rep.length << 2;
_XReadPad(dpy, image->data, nbytes);
UnlockDisplay(dpy);
SyncHandle();
return 1;
}
/**
* Grabs a frame from x11 (public device demuxer API).
*
* @param s1 Context from avformat core
* @param pkt Packet holding the brabbed frame
* @return frame size in bytes
*/
static int
x11grab_read_packet(AVFormatContext *s1, AVPacket *pkt)
{
struct x11_grab *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_C(1000000);
/* wait based on the frame rate */
for(;;) {
curtime = av_gettime();
delay = s->time_frame * av_q2d(s->time_base) - curtime;
if (delay <= 0) {
if (delay < INT64_C(-1000000) * av_q2d(s->time_base)) {
s->time_frame += INT64_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(EIO);
}
pkt->pts = curtime;
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 {
if (!xget_zpixmap(dpy, RootWindow(dpy, DefaultScreen(dpy)), image, x_off, y_off)) {
av_log (s1, AV_LOG_INFO, "XGetZPixmap() failed\n");
}
}
{
int pointer_x, pointer_y;
get_pointer_coordinates(&pointer_x, &pointer_y, dpy, s1);
paint_mouse_pointer(image, s, pointer_x, pointer_y);
}
/* XXX: avoid memcpy */
memcpy(pkt->data, image->data, s->frame_size);
return s->frame_size;
}
/**
* Closes x11 frame grabber (public device demuxer API).
*
* @param s1 Context from avformat core
* @return 0 success, !0 failure
*/
static int
x11grab_read_close(AVFormatContext *s1)
{
struct x11_grab *x11grab = s1->priv_data;
/* 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;
}
/** x11 grabber device demuxer declaration */
AVInputFormat x11_grab_device_demuxer =
{
"x11grab",
NULL_IF_CONFIG_SMALL("X11grab"),
sizeof(struct x11_grab),
NULL,
x11grab_read_header,
x11grab_read_packet,
x11grab_read_close,
.flags = AVFMT_NOFILE,
};
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