[Ffmpeg-cvslog] r7308 - trunk/libavformat/x11grab.c
gpoirier
subversion
Wed Dec 13 09:50:30 CET 2006
Author: gpoirier
Date: Wed Dec 13 09:50:30 2006
New Revision: 7308
Modified:
trunk/libavformat/x11grab.c
Log:
RFC 6: Overall cleanups again.
- License should be fixed now (finally)
- Added doxygen comments
- Cleaned up the X11Grab structure
- Renamed X11Grab structure to x11_grab_s
- Changed some Java stylish named functions to more C'stylish ones
- Changed order of some parameters so they are more libc alike with
destination as first parameter
- Use AVRational where relevant
- Fixed time calculation
- Cleaned up a few little tiny things around the sources
+ removed a goto
+ removed unused vars
+ etc...
(Patch by Edouard Gomez)
Modified: trunk/libavformat/x11grab.c
==============================================================================
--- trunk/libavformat/x11grab.c (original)
+++ trunk/libavformat/x11grab.c Wed Dec 13 09:50:30 2006
@@ -25,10 +25,16 @@
* 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.,
+ * with FFmpeg; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
+/**
+ * @file x11grab.c
+ * X11 frame device demuxer by Clemens Fruhwirth <clemens at endorphin.org>
+ * and Edouard Gomez <ed.gomez at free.fr>.
+ */
+
#include "avformat.h"
#include <unistd.h>
#include <fcntl.h>
@@ -46,41 +52,53 @@
#include <sys/shm.h>
#include <X11/extensions/XShm.h>
-typedef struct
+/**
+ * X11 Device Demuxer context
+ */
+typedef struct x11_grab_s
{
- 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;
+ 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 */
+} x11_grab_t;
+/**
+ * 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>ENOMEM no memory left</li>
+ * <li>AVERROR_IO other failure case</li>
+ * <li>0 success</li>
+ * </ul>
+ */
static int
x11grab_read_header(AVFormatContext *s1, AVFormatParameters *ap)
{
- X11Grab *x11grab = s1->priv_data;
+ x11_grab_t *x11grab = s1->priv_data;
Display *dpy;
AVStream *st = NULL;
- int width, height;
- int frame_rate, frame_rate_base, frame_size;
int input_pixfmt;
XImage *image;
- int x_off=0; int y_off = 0;
+ int x_off = 0;
+ int y_off = 0;
int use_shm;
dpy = XOpenDisplay(NULL);
if(!dpy) {
- goto fail;
+ av_free(st);
+ return AVERROR_IO;
}
sscanf(ap->device, "x11:%d,%d", &x_off, &y_off);
@@ -91,11 +109,6 @@
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;
@@ -103,7 +116,7 @@
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\n", use_shm ? "found" : "not found");
+ av_log(s1, AV_LOG_INFO, "shared memory extension %s found\n", use_shm ? "" : "not");
if(use_shm) {
int scr = XDefaultScreen(dpy);
@@ -142,13 +155,14 @@
input_pixfmt = PIX_FMT_PAL8;
break;
case 16:
- if ( image->red_mask == 0xF800 && image->green_mask == 0x07E0
- && image->blue_mask == 0x1F ) {
+ 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 == 0x1F ) {
+ } 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 {
@@ -158,12 +172,13 @@
}
break;
case 24:
- if ( image->red_mask == 0xFF0000 &&
- image->green_mask == 0xFF00
- && image->blue_mask == 0xFF ) {
+ if ( image->red_mask == 0xff0000 &&
+ image->green_mask == 0x00ff00 &&
+ image->blue_mask == 0x0000ff ) {
input_pixfmt = PIX_FMT_BGR24;
- } else if ( image->red_mask == 0xFF && image->green_mask == 0xFF00
- && image->blue_mask == 0xFF0000 ) {
+ } 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);
@@ -174,7 +189,7 @@
case 32:
#if 0
GetColorInfo (image, &c_info);
- if ( c_info.alpha_mask == 0xFF000000 && image->green_mask == 0xFF00 ) {
+ 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
@@ -194,41 +209,41 @@
return -1;
}
- frame_size = width * height * image->bits_per_pixel/8;
- x11grab->frame_size = frame_size;
+ x11grab->frame_size = ap->width * ap->height * image->bits_per_pixel/8;
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->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_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->width = ap->width;
+ st->codec->height = ap->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;
+ st->codec->time_base = ap->time_base;
+ st->codec->bit_rate = x11grab->frame_size * 1/av_q2d(ap->time_base) * 8;
return 0;
-fail:
- av_free(st);
- return AVERROR_IO;
}
+/**
+ * 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
-getCurrentPointer(AVFormatContext *s1, X11Grab *s, int *x, int *y)
+get_pointer_coordinates(int *x, int *y, Display *dpy, AVFormatContext *s1)
{
Window mrootwindow, childwindow;
int dummy;
- Display *dpy = s->dpy;
mrootwindow = DefaultRootWindow(dpy);
@@ -241,6 +256,17 @@
}
}
+/**
+ * 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)
{
@@ -252,28 +278,39 @@
*(uint16_t*)dst = (*(uint16_t*)dst & and) | or;
break;
case 8:
- *dst = (or) ? 1 : 0;
+ *dst = !!or;
break;
}
}
+/**
+ * Paints a mouse pointer in an X11 image.
+ *
+ * @param image Image where to paint the mouse pointer
+ * @param s context used to retrieve original grabbing rectangle
+ * coordinates
+ * @param x Mouse pointer coordinate
+ * @param y Mouse pointer coordinate
+ */
static void
-paintMousePointer(AVFormatContext *s1, X11Grab *s, int *x, int *y, XImage *image)
+paint_mouse_pointer(XImage *image, x11_grab_t *s, int x, int y)
{
+ /* 16x20x1bpp bitmap for the black channel of the mouse pointer */
static const uint16_t const mousePointerBlack[] =
{
- 0, 49152, 40960, 36864, 34816,
- 33792, 33280, 33024, 32896, 32832,
- 33728, 37376, 43264, 51456, 1152,
- 1152, 576, 576, 448, 0
+ 0x0000, 0xc000, 0xa000, 0x9000, 0x8800,
+ 0x8400, 0x8200, 0x8100, 0x8080, 0x8040,
+ 0x83c0, 0x9200, 0xa900, 0xc900, 0x0480,
+ 0x0480, 0x0240, 0x0240, 0x01c0, 0x0000
};
+ /* 16x20x1bpp bitmap for the white channel of the mouse pointer */
static const uint16_t const mousePointerWhite[] =
{
- 0, 0, 16384, 24576, 28672,
- 30720, 31744, 32256, 32512, 32640,
- 31744, 27648, 17920, 1536, 768,
- 768, 384, 384, 0, 0
+ 0x0000, 0x0000, 0x4000, 0x6000, 0x7000,
+ 0x7800, 0x7c00, 0x7e00, 0x7f00, 0x7f80,
+ 0x7c00, 0x6c00, 0x4600, 0x0600, 0x0300,
+ 0x0300, 0x0180, 0x0180, 0x0000, 0x0000
};
int x_off = s->x_off;
@@ -281,74 +318,40 @@
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;
+ 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;
- const uint16_t *black;
- const uint16_t *white;
+ int bytes_per_pixel;
+ int line;
int masks;
- int onepixel;
-
- /* Select correct pointer pixels */
- if (s->mouse_wanted == 1) {
- /* Normal pointer */
- black = mousePointerBlack;
- white = mousePointerWhite;
- } else {
- /* Inverted pointer */
- black = mousePointerWhite;
- white = mousePointerBlack;
- }
/* Select correct masks and pixel size */
- switch (image->bits_per_pixel) {
- case 32:
- masks = (image->red_mask|image->green_mask|image->blue_mask);
- onepixel = 4;
- break;
- case 24:
- /* XXX: Though the code seems to support 24bit images, the
- * apply_masks lacks support for 24bit */
- masks = (image->red_mask|image->green_mask|image->blue_mask);
- onepixel = 3;
- break;
- case 16:
- masks = (image->red_mask|image->green_mask|image->blue_mask);
- onepixel = 2;
- break;
- case 8:
+ if (image->bits_per_pixel == 8) {
masks = 1;
- onepixel = 1;
- break;
- default:
- /* Shut up gcc */
- masks = 0;
- onepixel = 0;
+ } 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 */
- im_data += (image->bits_per_pixel / 8 * (*x - x_off));
+ 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 < min(20, (y_off + height) - *y); line++) {
+ for (line = 0; line < FFMIN(20, (y_off + height) - y); line++) {
uint8_t *cursor = im_data;
- int width_cursor;
+ int column;
uint16_t bm_b;
uint16_t bm_w;
- bm_b = black[line];
- bm_w = white[line];
+ bm_b = mousePointerBlack[line];
+ bm_w = mousePointerWhite[line];
- for (width_cursor=0;
- width_cursor < 16 && (width_cursor + *x) < (width + x_off);
- width_cursor++) {
- apply_masks(cursor,
- ~(masks*(bm_b&1)), masks*(bm_w&1),
+ 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 += onepixel;
+ cursor += bytes_per_pixel;
bm_b >>= 1;
bm_w >>= 1;
}
@@ -358,19 +361,25 @@
}
-/*
- * just read new data in the image structure, the image
- * structure inclusive the data area must be allocated before
+/**
+ * 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
-XGetZPixmap(Display *dpy, Drawable d, XImage *image, int x, int y)
+xget_zpixmap(Display *dpy, Drawable d, XImage *image, int x, int y)
{
xGetImageReply rep;
xGetImageReq *req;
long nbytes;
if (!image) {
- return False;
+ return 0;
}
LockDisplay(dpy);
@@ -385,10 +394,10 @@
req->planeMask = (unsigned int)AllPlanes;
req->format = ZPixmap;
- if (!_XReply(dpy, (xReply *) &rep, 0, xFalse) || !rep.length) {
+ if (!_XReply(dpy, (xReply *)&rep, 0, xFalse) || !rep.length) {
UnlockDisplay(dpy);
SyncHandle();
- return False;
+ return 0;
}
nbytes = (long)rep.length << 2;
@@ -396,13 +405,20 @@
UnlockDisplay(dpy);
SyncHandle();
- return True;
+ 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)
{
- X11Grab *s = s1->priv_data;
+ x11_grab_t *s = s1->priv_data;
Display *dpy = s->dpy;
XImage *image = s->image;
int x_off = s->x_off;
@@ -417,9 +433,9 @@
/* wait based on the frame rate */
for(;;) {
curtime = av_gettime();
- delay = s->time_frame * s->frame_rate_base / s->frame_rate - curtime;
+ delay = s->time_frame * av_q2d(s->time_base) - curtime;
if (delay <= 0) {
- if (delay < int64_t_C(-1000000) * s->frame_rate_base / s->frame_rate) {
+ if (delay < int64_t_C(-1000000) * av_q2d(s->time_base)) {
s->time_frame += int64_t_C(1000000);
}
break;
@@ -433,22 +449,22 @@
return AVERROR_IO;
}
- pkt->pts = curtime & ((1LL << 48) - 1);
+ 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 (!XGetZPixmap(dpy, RootWindow(dpy, DefaultScreen(dpy)), image, x_off, y_off)) {
+ 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;
- getCurrentPointer(s1, s, &pointer_x, &pointer_y);
- paintMousePointer(s1, s, &pointer_x, &pointer_y, image);
+ get_pointer_coordinates(&pointer_x, &pointer_y, dpy, s1);
+ paint_mouse_pointer(image, s, pointer_x, pointer_y);
}
@@ -457,10 +473,16 @@
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)
{
- X11Grab *x11grab = s1->priv_data;
+ x11_grab_t *x11grab = s1->priv_data;
/* Detach cleanly from shared mem */
if (x11grab->use_shm) {
@@ -480,11 +502,12 @@
return 0;
}
+/** x11 grabber device demuxer declaration */
AVInputFormat x11_grab_device_demuxer =
{
"x11grab",
"X11grab",
- sizeof(X11Grab),
+ sizeof(x11_grab_t),
NULL,
x11grab_read_header,
x11grab_read_packet,
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