cebix/mintv/mintv.cpp

/*
 *  mintv.cpp - 50/60Hz video display using v4l and XVideo
 *
 *  Written in 2003 by Christian Bauer
 */

#include <stdio.h>
#include <stdlib.h>
#include <getopt.h>
#include <errno.h>

#include <unistd.h>
#include <fcntl.h>
#include <sys/time.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/shm.h>
#include <linux/videodev.h>

#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/StringDefs.h>
#include <X11/Intrinsic.h>
#include <X11/Shell.h>
#include <X11/Xaw/Simple.h>
#include <X11/extensions/XShm.h>
#include <X11/extensions/Xv.h>
#include <X11/extensions/Xvlib.h>

static bool ntsc = false;

const int PAL_WIDTH = 384;
const int PAL_HEIGHT = 288;
const int NTSC_WIDTH = 320;
const int NTSC_HEIGHT = 240;

static int grab_width, grab_height;
static int image_width, image_height;
static int win_width, win_height;

const int PAL_FPS = 50;
const int NTSC_FPS = 60;

static int fps;

static int brightness = 50, contrast = 50, color = 50;

static int channel = 1;

#define XV_FORMAT 0x32595559
#define BYTES_PER_PIXEL 2

#define DOUBLE_FRAME 1
#define LOGGING 0

#if LOGGING
static FILE *log;
#endif

static int port = -1;
static Display *dpy;
static GC gc;
static Atom wm;
static Widget app_shell, video;
static XShmSegmentInfo shminfo;
static XvImage *image[2];
static int fd = -1;

static void quit(Widget widget, XEvent *event, String *params, Cardinal *num_params)
{
        XShmDetach(dpy, &shminfo);
        shmdt(shminfo.shmaddr);

        if (fd >= 0) {
                video_audio au;
                au.audio = 1;
                ioctl(fd, VIDIOCGAUDIO, &au);
                au.flags |= VIDEO_AUDIO_MUTE;
                ioctl(fd, VIDIOCSAUDIO, &au);
                close(fd);
        }

        exit(0);
}

static void set_bcc(void)
{
        video_picture pict;
        if (ioctl(fd, VIDIOCGPICT, &pict) < 0) {
                fprintf(stderr, "ioctl VIDIOCGPICT: %s\n", strerror(errno));
                exit(1);
        }
        pict.brightness = brightness * 65536 / 100;
        pict.contrast = contrast * 65536 / 100;
        pict.colour = color * 65536 / 100;
        if (ioctl(fd, VIDIOCSPICT, &pict) < 0) {
                fprintf(stderr, "ioctl VIDIOCSPICT: %s\n", strerror(errno));
                exit(1);
        }
}

static void inc_brightness(Widget widget, XEvent *event, String *params, Cardinal *num_params)
{
        if (brightness < 100)
                brightness++;
        set_bcc();
}

static void dec_brightness(Widget widget, XEvent *event, String *params, Cardinal *num_params)
{
        if (brightness > 0)
                brightness--;
        set_bcc();
}

static void reset_brightness(Widget widget, XEvent *event, String *params, Cardinal *num_params)
{
        brightness = 50;
        set_bcc();
}

static void inc_contrast(Widget widget, XEvent *event, String *params, Cardinal *num_params)
{
        if (contrast < 100)
                contrast++;
        set_bcc();
}

static void dec_contrast(Widget widget, XEvent *event, String *params, Cardinal *num_params)
{
        if (contrast > 0)
                contrast--;
        set_bcc();
}

static void reset_contrast(Widget widget, XEvent *event, String *params, Cardinal *num_params)
{
        contrast = 50;
        set_bcc();
}

static void inc_color(Widget widget, XEvent *event, String *params, Cardinal *num_params)
{
        if (color < 100)
                color++;
        set_bcc();
}

static void dec_color(Widget widget, XEvent *event, String *params, Cardinal *num_params)
{
        if (color > 0)
                color--;
        set_bcc();
}

static void reset_color(Widget widget, XEvent *event, String *params, Cardinal *num_params)
{
        color = 50;
        set_bcc();
}

static void set_channel(void)
{
        video_channel chan;
        chan.channel = channel;
        if (ioctl(fd, VIDIOCGCHAN, &chan) < 0) {
                fprintf(stderr, "ioctl VIDIOCGCHAN: %s\n", strerror(errno));
                exit(1);
        }
        if (ntsc)
                chan.norm = VIDEO_MODE_NTSC;
        else
                chan.norm = VIDEO_MODE_PAL;
        if (ioctl(fd, VIDIOCSCHAN, &chan) < 0) {
                fprintf(stderr, "ioctl VIDIOCSCHAN: %s\n", strerror(errno));
                exit(1);
        }
}

static void select_channel_1(Widget widget, XEvent *event, String *params, Cardinal *num_params)
{
        channel = 1;
        set_channel();
}

static void select_channel_2(Widget widget, XEvent *event, String *params, Cardinal *num_params)
{
        channel = 2;
        set_channel();
}

static XtActionsRec actionTable[] = {
        {"quit", quit},
        {"inc_brightness", inc_brightness},
        {"dec_brightness", dec_brightness},
        {"reset_brightness", reset_brightness},
        {"inc_contrast", inc_contrast},
        {"dec_contrast", dec_contrast},
        {"reset_contrast", reset_contrast},
        {"inc_color", inc_color},
        {"dec_color", dec_color},
        {"reset_color", reset_color},
        {"select_channel_1", select_channel_1},
        {"select_channel_2", select_channel_2}
};

static void resize_event(Widget widget, XtPointer client_data, XEvent *event, Boolean *d)
{
        if (event->type == ConfigureNotify) {
                win_width = event->xconfigure.width;
                win_height = event->xconfigure.height;
    }
}

static video_mbuf mbuf;
static void *buf = NULL;
static video_mmap mm[2];
static int bufnum = 0;

typedef long long int64;
typedef unsigned long long uint64;

uint64 GetTicks_usec(void)
{
        struct timeval t;
        gettimeofday(&t, NULL);
        return (uint64)t.tv_sec * 1000000 + t.tv_usec;
}

void Delay_usec(unsigned usec)
{
        int was_error;
        struct timeval tv;

        /* Set the timeout interval - Linux only needs to do this once */
        tv.tv_sec = 0;
        tv.tv_usec = usec;
        do {
                errno = 0;
                was_error = select(0, NULL, NULL, NULL, &tv);
        } while (was_error && (errno == EINTR));
}

uint64 frame_time = 0;

static Boolean work_proc(XtPointer client_data)
{
        ioctl(fd, VIDIOCMCAPTURE, &(mm[bufnum ^ 1]));
        ioctl(fd, VIDIOCSYNC, &bufnum);

        uint64 now = GetTicks_usec();
#if LOGGING
        fprintf(log, "frame_time: %Ld\n", now - frame_time);
#endif
        frame_time = now;

#if DOUBLE_FRAME
        char *src = (char *)buf + mbuf.offsets[bufnum];
        char *dst = image[0]->data;
        for (unsigned y=0; y<grab_height; y+=2) {
                memcpy(dst, src, grab_width * BYTES_PER_PIXEL);
                src += grab_width * BYTES_PER_PIXEL * 2;
                dst += grab_width * BYTES_PER_PIXEL;
        }

        uint64 prev = GetTicks_usec();

        XvShmPutImage(
                dpy, port, XtWindow(video), gc, image[0],
                0, 0, image_width, image_height,
                0, 0, win_width, win_height,
                False
        );

        src = (char *)buf + mbuf.offsets[bufnum] + grab_width * BYTES_PER_PIXEL;
        dst = image[1]->data;
        for (unsigned y=0; y<grab_height; y+=2) {
                memcpy(dst, src, grab_width * BYTES_PER_PIXEL);
                src += grab_width * BYTES_PER_PIXEL * 2;
                dst += grab_width * BYTES_PER_PIXEL;
        }

        XSync(dpy, False);

        now = GetTicks_usec();
        uint64 elapsed = now - prev;
        int64 delay = 1000000 / fps - (now - prev);
#if LOGGING
        fprintf(log, "elapsed %Ld usec, delay %Ld usec\n", elapsed, delay);
#endif
        if (delay > 0)
                Delay_usec(delay);

        XvShmPutImage(
                dpy, port, XtWindow(video), gc, image[1],
                0, 0, image_width, image_height,
                0, 0, win_width, win_height,
                False
        );
        XSync(dpy, False);
#else
        memcpy(image[0]->data, (char *)buf + mbuf.offsets[bufnum], image[0]->data_size);

        XvShmPutImage(
                dpy, port, XtWindow(video), gc, image[0],
                0, 0, image_width, image_height,
                0, 0, win_width, win_height,
                False
        );
        XSync(dpy, False);
#endif

        bufnum ^= 1;

        return False;
}

int main(int argc, char **argv)
{
        static struct option long_opts[] = {
                {"help", 0, 0, 'h'},
                {"ntsc", 0, 0, 'n'},
                {"port", 1, 0, 'p'},
                {NULL, 0, 0, 0}
        };

#if LOGGING
        log = fopen("log", "w");
#endif

        // Parse options
        for (;;) {
                int c;
                if ((c = getopt_long(argc, argv, "hnp:", long_opts,NULL)) == -1)
                        break;

                switch (c) {
                        case 0: /* Long option */
                                break;
                        case 'n':
                                ntsc = true;
                                break;
                        case 'p':
                                port = atoi(optarg);
                                break;
                        case 'h':
                        default:
                                fprintf(stderr,
                                        "50/60Hz video display application\n\n"
                                        "Options:\n"
                                        "  -h | --help    this text\n"
                                        "  -n | --ntsc    NTSC mode\n"
                                        "  -p | --port n  Xv output port\n\n"
                                        "Keyboard commands:\n"
                                        "  q         quit\n"
                                        "  1/2       select channel\n"
                                        "  KP 7/4/1  adjust brightness\n"
                                        "  KP 8/5/2  adjust contrast\n"
                                        "  KP 9/6/3  adjust color\n"
                                );
                                exit(1);
                                break;
                }
        }

        // Init X11
        XtAppContext app_context;
        app_shell = XtAppInitialize(&app_context, "mintv", NULL, 0, &argc, argv, NULL,  NULL, 0);
        dpy = XtDisplay(app_shell);
        XtAppAddActions(app_context,actionTable, sizeof(actionTable) / sizeof(XtActionsRec));
        XtOverrideTranslations(app_shell, XtParseTranslationTable(
                "<Message>WM_PROTOCOLS: quit()\n"
                "<Key>q: quit()\n"
                "<Key>1: select_channel_1()\n"
                "<Key>2: select_channel_2()\n"
                "<Key>KP_7: inc_brightness()\n"
                "<Key>KP_4: reset_brightness()\n"
                "<Key>KP_1: dec_brightness()\n"
                "<Key>KP_8: inc_contrast()\n"
                "<Key>KP_5: reset_contrast()\n"
                "<Key>KP_2: dec_contrast()\n"
                "<Key>KP_9: inc_color()\n"
                "<Key>KP_6: reset_color()\n"
                "<Key>KP_3: dec_color()"
        ));
        XtAddEventHandler(app_shell, StructureNotifyMask, True, resize_event, NULL);
        wm = XInternAtom(XtDisplay(app_shell), "WM_DELETE_WINDOW", False);

        // Xvideo available?
        unsigned ver, rel, req, ev, err, val;
        if (XvQueryExtension(dpy, &ver, &rel, &req, &ev, &err) != Success) {
                fprintf(stderr, "Server doesn't support Xvideo\n");
                exit(1);
        }

        // Yes, query available adaptors
        unsigned num_adaptors;
        XvAdaptorInfo *ai;
        if (XvQueryAdaptors(dpy, DefaultRootWindow(dpy), &num_adaptors, &ai) != Success) {
                fprintf(stderr, "XvQueryAdaptors failed\n");
                exit(1);
        }

        // Find usable port
        if (port < 0) {
                for (unsigned i=0; i<num_adaptors; i++) {
                        if (ai[i].type & XvImageMask) {
                                for (unsigned p=ai[i].base_id; p<ai[i].base_id+ai[i].num_ports; p++) {
                                        int num_formats;
                                        XvImageFormatValues *fo = XvListImageFormats(dpy, p, &num_formats);
                                        if (fo) {
                                                for (unsigned j=0; j<num_formats; j++) {
                                                        if (fo[j].id == XV_FORMAT) {
                                                                port = p;
                                                                goto port_found;
                                                        }
                                                }
                                                XFree(fo);
                                        }
                                }
                        }
                }
port_found:
                ;
        }
        if (port < 0) {
                fprintf(stderr, "No suitable XVideo port found\n");
                exit(1);
        } else
                printf("Using XVideo port %d\n", port);

        // Set grab and window dimensions
        if (ntsc) {
                grab_width = NTSC_WIDTH;
                grab_height = NTSC_HEIGHT;
                fps = NTSC_FPS;
        } else {
                grab_width = PAL_WIDTH;
                grab_height = PAL_HEIGHT;
                fps = PAL_FPS;
        }
        image_width = grab_width;
        image_height = grab_height;
        win_width = DisplayWidth(dpy, DefaultScreen(dpy));
        win_height = DisplayHeight(dpy, DefaultScreen(dpy));
#if DOUBLE_FRAME
        grab_height *= 2;
#endif

        // Open window
        video = XtVaCreateManagedWidget("video", simpleWidgetClass, app_shell,
                XtNwidth, win_width,
                XtNheight, win_height,
                NULL
        );
        XtRealizeWidget(app_shell);
        XtVaSetValues(app_shell,
                XtNtitle, "mintv",
                NULL
        );
        XSetWMProtocols(XtDisplay(app_shell), XtWindow(app_shell), &wm, 1);
        gc = XCreateGC(dpy, XtWindow(video), 0, NULL);

        // Set image format
        unsigned format = XV_FORMAT;

        // Create image
        image[0] = XvShmCreateImage(dpy, port, format, NULL, image_width, image_height, &shminfo);
        image[1] = XvShmCreateImage(dpy, port, format, NULL, image_width, image_height, &shminfo);
        shminfo.shmid = shmget(IPC_PRIVATE, image[0]->data_size * 2, IPC_CREAT | 0777);
        shminfo.shmaddr = (char *)shmat(shminfo.shmid, NULL, 0);
        shminfo.readOnly = False;
        image[0]->data = shminfo.shmaddr;
        image[1]->data = shminfo.shmaddr + image[0]->data_size;
        XShmAttach(dpy, &shminfo);
        XSync(dpy, False);
        shmctl(shminfo.shmid, IPC_RMID, 0);
        memset(image[0]->data, 0x80, image[0]->data_size * 2);

        // Open frame grabber device
        fd = open("/dev/video0", O_RDWR);
        if (fd < 0) {
                fprintf(stderr, "Can't open /dev/video0: %s\n", strerror(errno));
                exit(1);
        }

        // Set channel
        set_channel();

        video_audio au;
        au.audio = 1;
        if (ioctl(fd, VIDIOCGAUDIO, &au) < 0) {
                fprintf(stderr, "ioctl VIDIOCGAUDIO: %s\n", strerror(errno));
                exit(1);
        }
        au.flags &= ~VIDEO_AUDIO_MUTE;
        if (ioctl(fd, VIDIOCSAUDIO, &au) < 0) {
                fprintf(stderr, "ioctl VIDIOCSAUDIO: %s\n", strerror(errno));
                exit(1);
        }

        // Configure frame grabber
        set_bcc();

        if (ioctl(fd, VIDIOCGMBUF, &mbuf) < 0) {
                fprintf(stderr, "ioctl VIDIOCGMBUF: %s\n", strerror(errno));
                exit(1);
        }

        buf = mmap(NULL, mbuf.size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
        if (buf == NULL) {
                fprintf(stderr, "mmap failed: %s\n", strerror(errno));
                exit(1);
        }

        mm[0].frame = 0;
        mm[0].width = grab_width;
        mm[0].height = grab_height;
        mm[0].format = VIDEO_PALETTE_YUV422;
        mm[1].frame = 1;
        mm[1].width = grab_width;
        mm[1].height = grab_height;
        mm[1].format = VIDEO_PALETTE_YUV422;
        ioctl(fd, VIDIOCMCAPTURE, &(mm[bufnum]));

        // Disable screen saver
        XSetScreenSaver(dpy, 0, 0, DefaultBlanking, DefaultExposures);

        // Main loop
        XtAppAddWorkProc(app_context, work_proc, NULL);
        XtAppMainLoop(app_context);

        return 0;
}
Revision:	1.3
Committed:	2003-03-01T15:23:26Z (21 years, 9 months ago) by cebix
Branch:	MAIN
Changes since 1.2:	+24 -24 lines
Log Message:	parse arguments before initializing X
#	User	Rev	Content
1	cebix	1.1	/*
2			* mintv.cpp - 50/60Hz video display using v4l and XVideo
3			*
4			* Written in 2003 by Christian Bauer
5			*/
6
7			#include <stdio.h>
8			#include <stdlib.h>
9			#include <getopt.h>
10			#include <errno.h>
11
12			#include <unistd.h>
13			#include <fcntl.h>
14			#include <sys/time.h>
15			#include <sys/ioctl.h>
16			#include <sys/mman.h>
17			#include <sys/shm.h>
18			#include <linux/videodev.h>
19
20			#include <X11/Xlib.h>
21			#include <X11/Xutil.h>
22			#include <X11/StringDefs.h>
23			#include <X11/Intrinsic.h>
24			#include <X11/Shell.h>
25			#include <X11/Xaw/Simple.h>
26			#include <X11/extensions/XShm.h>
27			#include <X11/extensions/Xv.h>
28			#include <X11/extensions/Xvlib.h>
29
30	cebix	1.2	static bool ntsc = false;
31
32	cebix	1.1	const int PAL_WIDTH = 384;
33			const int PAL_HEIGHT = 288;
34			const int NTSC_WIDTH = 320;
35			const int NTSC_HEIGHT = 240;
36
37			static int grab_width, grab_height;
38			static int image_width, image_height;
39			static int win_width, win_height;
40
41			const int PAL_FPS = 50;
42			const int NTSC_FPS = 60;
43
44			static int fps;
45
46	cebix	1.2	static int brightness = 50, contrast = 50, color = 50;
47
48			static int channel = 1;
49
50	cebix	1.1	#define XV_FORMAT 0x32595559
51			#define BYTES_PER_PIXEL 2
52
53			#define DOUBLE_FRAME 1
54			#define LOGGING 0
55
56			#if LOGGING
57			static FILE *log;
58			#endif
59
60			static int port = -1;
61			static Display *dpy;
62			static GC gc;
63			static Atom wm;
64			static Widget app_shell, video;
65			static XShmSegmentInfo shminfo;
66			static XvImage *image[2];
67			static int fd = -1;
68
69			static void quit(Widget widget, XEvent event, String params, Cardinal *num_params)
70			{
71			XShmDetach(dpy, &shminfo);
72			shmdt(shminfo.shmaddr);
73
74			if (fd >= 0) {
75			video_audio au;
76			au.audio = 1;
77			ioctl(fd, VIDIOCGAUDIO, &au);
78			au.flags \|= VIDEO_AUDIO_MUTE;
79			ioctl(fd, VIDIOCSAUDIO, &au);
80			close(fd);
81			}
82
83			exit(0);
84			}
85
86	cebix	1.2	static void set_bcc(void)
87			{
88			video_picture pict;
89			if (ioctl(fd, VIDIOCGPICT, &pict) < 0) {
90			fprintf(stderr, "ioctl VIDIOCGPICT: %s\n", strerror(errno));
91			exit(1);
92			}
93			pict.brightness = brightness * 65536 / 100;
94			pict.contrast = contrast * 65536 / 100;
95			pict.colour = color * 65536 / 100;
96			if (ioctl(fd, VIDIOCSPICT, &pict) < 0) {
97			fprintf(stderr, "ioctl VIDIOCSPICT: %s\n", strerror(errno));
98			exit(1);
99			}
100			}
101
102			static void inc_brightness(Widget widget, XEvent event, String params, Cardinal *num_params)
103			{
104			if (brightness < 100)
105			brightness++;
106			set_bcc();
107			}
108
109			static void dec_brightness(Widget widget, XEvent event, String params, Cardinal *num_params)
110			{
111			if (brightness > 0)
112			brightness--;
113			set_bcc();
114			}
115
116			static void reset_brightness(Widget widget, XEvent event, String params, Cardinal *num_params)
117			{
118			brightness = 50;
119			set_bcc();
120			}
121
122			static void inc_contrast(Widget widget, XEvent event, String params, Cardinal *num_params)
123			{
124			if (contrast < 100)
125			contrast++;
126			set_bcc();
127			}
128
129			static void dec_contrast(Widget widget, XEvent event, String params, Cardinal *num_params)
130			{
131			if (contrast > 0)
132			contrast--;
133			set_bcc();
134			}
135
136			static void reset_contrast(Widget widget, XEvent event, String params, Cardinal *num_params)
137			{
138			contrast = 50;
139			set_bcc();
140			}
141
142			static void inc_color(Widget widget, XEvent event, String params, Cardinal *num_params)
143			{
144			if (color < 100)
145			color++;
146			set_bcc();
147			}
148
149			static void dec_color(Widget widget, XEvent event, String params, Cardinal *num_params)
150			{
151			if (color > 0)
152			color--;
153			set_bcc();
154			}
155
156			static void reset_color(Widget widget, XEvent event, String params, Cardinal *num_params)
157			{
158			color = 50;
159			set_bcc();
160			}
161
162			static void set_channel(void)
163			{
164			video_channel chan;
165			chan.channel = channel;
166			if (ioctl(fd, VIDIOCGCHAN, &chan) < 0) {
167			fprintf(stderr, "ioctl VIDIOCGCHAN: %s\n", strerror(errno));
168			exit(1);
169			}
170			if (ntsc)
171			chan.norm = VIDEO_MODE_NTSC;
172			else
173			chan.norm = VIDEO_MODE_PAL;
174			if (ioctl(fd, VIDIOCSCHAN, &chan) < 0) {
175			fprintf(stderr, "ioctl VIDIOCSCHAN: %s\n", strerror(errno));
176			exit(1);
177			}
178			}
179
180			static void select_channel_1(Widget widget, XEvent event, String params, Cardinal *num_params)
181			{
182			channel = 1;
183			set_channel();
184			}
185
186			static void select_channel_2(Widget widget, XEvent event, String params, Cardinal *num_params)
187			{
188			channel = 2;
189			set_channel();
190			}
191
192	cebix	1.1	static XtActionsRec actionTable[] = {
193	cebix	1.2	{"quit", quit},
194			{"inc_brightness", inc_brightness},
195			{"dec_brightness", dec_brightness},
196			{"reset_brightness", reset_brightness},
197			{"inc_contrast", inc_contrast},
198			{"dec_contrast", dec_contrast},
199			{"reset_contrast", reset_contrast},
200			{"inc_color", inc_color},
201			{"dec_color", dec_color},
202			{"reset_color", reset_color},
203			{"select_channel_1", select_channel_1},
204			{"select_channel_2", select_channel_2}
205	cebix	1.1	};
206
207			static void resize_event(Widget widget, XtPointer client_data, XEvent event, Boolean d)
208			{
209			if (event->type == ConfigureNotify) {
210			win_width = event->xconfigure.width;
211			win_height = event->xconfigure.height;
212			}
213			}
214
215			static video_mbuf mbuf;
216			static void *buf = NULL;
217			static video_mmap mm[2];
218			static int bufnum = 0;
219
220			typedef long long int64;
221			typedef unsigned long long uint64;
222
223			uint64 GetTicks_usec(void)
224			{
225			struct timeval t;
226			gettimeofday(&t, NULL);
227			return (uint64)t.tv_sec * 1000000 + t.tv_usec;
228			}
229
230			void Delay_usec(unsigned usec)
231			{
232			int was_error;
233			struct timeval tv;
234
235			/* Set the timeout interval - Linux only needs to do this once */
236			tv.tv_sec = 0;
237			tv.tv_usec = usec;
238			do {
239			errno = 0;
240			was_error = select(0, NULL, NULL, NULL, &tv);
241			} while (was_error && (errno == EINTR));
242			}
243
244			uint64 frame_time = 0;
245
246			static Boolean work_proc(XtPointer client_data)
247			{
248			ioctl(fd, VIDIOCMCAPTURE, &(mm[bufnum ^ 1]));
249			ioctl(fd, VIDIOCSYNC, &bufnum);
250
251			uint64 now = GetTicks_usec();
252			#if LOGGING
253			fprintf(log, "frame_time: %Ld\n", now - frame_time);
254			#endif
255			frame_time = now;
256
257			#if DOUBLE_FRAME
258			char src = (char )buf + mbuf.offsets[bufnum];
259			char *dst = image[0]->data;
260			for (unsigned y=0; y<grab_height; y+=2) {
261			memcpy(dst, src, grab_width * BYTES_PER_PIXEL);
262			src += grab_width * BYTES_PER_PIXEL * 2;
263			dst += grab_width * BYTES_PER_PIXEL;
264			}
265
266			uint64 prev = GetTicks_usec();
267
268			XvShmPutImage(
269			dpy, port, XtWindow(video), gc, image[0],
270			0, 0, image_width, image_height,
271			0, 0, win_width, win_height,
272			False
273			);
274
275			src = (char )buf + mbuf.offsets[bufnum] + grab_width BYTES_PER_PIXEL;
276			dst = image[1]->data;
277			for (unsigned y=0; y<grab_height; y+=2) {
278			memcpy(dst, src, grab_width * BYTES_PER_PIXEL);
279			src += grab_width * BYTES_PER_PIXEL * 2;
280			dst += grab_width * BYTES_PER_PIXEL;
281			}
282
283			XSync(dpy, False);
284
285			now = GetTicks_usec();
286			uint64 elapsed = now - prev;
287			int64 delay = 1000000 / fps - (now - prev);
288			#if LOGGING
289			fprintf(log, "elapsed %Ld usec, delay %Ld usec\n", elapsed, delay);
290			#endif
291			if (delay > 0)
292			Delay_usec(delay);
293
294			XvShmPutImage(
295			dpy, port, XtWindow(video), gc, image[1],
296			0, 0, image_width, image_height,
297			0, 0, win_width, win_height,
298			False
299			);
300			XSync(dpy, False);
301			#else
302			memcpy(image[0]->data, (char *)buf + mbuf.offsets[bufnum], image[0]->data_size);
303
304			XvShmPutImage(
305			dpy, port, XtWindow(video), gc, image[0],
306			0, 0, image_width, image_height,
307			0, 0, win_width, win_height,
308			False
309			);
310			XSync(dpy, False);
311			#endif
312
313			bufnum ^= 1;
314
315			return False;
316			}
317
318			int main(int argc, char **argv)
319			{
320			static struct option long_opts[] = {
321			{"help", 0, 0, 'h'},
322			{"ntsc", 0, 0, 'n'},
323			{"port", 1, 0, 'p'},
324			{NULL, 0, 0, 0}
325			};
326
327			#if LOGGING
328			log = fopen("log", "w");
329			#endif
330
331			// Parse options
332			for (;;) {
333			int c;
334			if ((c = getopt_long(argc, argv, "hnp:", long_opts,NULL)) == -1)
335			break;
336
337			switch (c) {
338			case 0: /* Long option */
339			break;
340			case 'n':
341			ntsc = true;
342			break;
343			case 'p':
344			port = atoi(optarg);
345			break;
346			case 'h':
347			default:
348			fprintf(stderr,
349	cebix	1.3	"50/60Hz video display application\n\n"
350	cebix	1.1	"Options:\n"
351			" -h \| --help this text\n"
352			" -n \| --ntsc NTSC mode\n"
353	cebix	1.2	" -p \| --port n Xv output port\n\n"
354			"Keyboard commands:\n"
355			" q quit\n"
356			" 1/2 select channel\n"
357			" KP 7/4/1 adjust brightness\n"
358			" KP 8/5/2 adjust contrast\n"
359			" KP 9/6/3 adjust color\n"
360	cebix	1.1	);
361			exit(1);
362			break;
363			}
364			}
365	cebix	1.3
366			// Init X11
367			XtAppContext app_context;
368			app_shell = XtAppInitialize(&app_context, "mintv", NULL, 0, &argc, argv, NULL, NULL, 0);
369			dpy = XtDisplay(app_shell);
370			XtAppAddActions(app_context,actionTable, sizeof(actionTable) / sizeof(XtActionsRec));
371			XtOverrideTranslations(app_shell, XtParseTranslationTable(
372			"<Message>WM_PROTOCOLS: quit()\n"
373			"<Key>q: quit()\n"
374			"<Key>1: select_channel_1()\n"
375			"<Key>2: select_channel_2()\n"
376			"<Key>KP_7: inc_brightness()\n"
377			"<Key>KP_4: reset_brightness()\n"
378			"<Key>KP_1: dec_brightness()\n"
379			"<Key>KP_8: inc_contrast()\n"
380			"<Key>KP_5: reset_contrast()\n"
381			"<Key>KP_2: dec_contrast()\n"
382			"<Key>KP_9: inc_color()\n"
383			"<Key>KP_6: reset_color()\n"
384			"<Key>KP_3: dec_color()"
385			));
386			XtAddEventHandler(app_shell, StructureNotifyMask, True, resize_event, NULL);
387			wm = XInternAtom(XtDisplay(app_shell), "WM_DELETE_WINDOW", False);
388	cebix	1.1
389			// Xvideo available?
390			unsigned ver, rel, req, ev, err, val;
391			if (XvQueryExtension(dpy, &ver, &rel, &req, &ev, &err) != Success) {
392			fprintf(stderr, "Server doesn't support Xvideo\n");
393			exit(1);
394			}
395
396			// Yes, query available adaptors
397			unsigned num_adaptors;
398			XvAdaptorInfo *ai;
399			if (XvQueryAdaptors(dpy, DefaultRootWindow(dpy), &num_adaptors, &ai) != Success) {
400			fprintf(stderr, "XvQueryAdaptors failed\n");
401			exit(1);
402			}
403
404			// Find usable port
405			if (port < 0) {
406			for (unsigned i=0; i<num_adaptors; i++) {
407			if (ai[i].type & XvImageMask) {
408			for (unsigned p=ai[i].base_id; p<ai[i].base_id+ai[i].num_ports; p++) {
409			int num_formats;
410			XvImageFormatValues *fo = XvListImageFormats(dpy, p, &num_formats);
411			if (fo) {
412			for (unsigned j=0; j<num_formats; j++) {
413			if (fo[j].id == XV_FORMAT) {
414			port = p;
415			goto port_found;
416			}
417			}
418			XFree(fo);
419			}
420			}
421			}
422			}
423			port_found:
424			;
425			}
426			if (port < 0) {
427			fprintf(stderr, "No suitable XVideo port found\n");
428			exit(1);
429			} else
430			printf("Using XVideo port %d\n", port);
431
432			// Set grab and window dimensions
433			if (ntsc) {
434			grab_width = NTSC_WIDTH;
435			grab_height = NTSC_HEIGHT;
436			fps = NTSC_FPS;
437			} else {
438			grab_width = PAL_WIDTH;
439			grab_height = PAL_HEIGHT;
440			fps = PAL_FPS;
441			}
442			image_width = grab_width;
443			image_height = grab_height;
444			win_width = DisplayWidth(dpy, DefaultScreen(dpy));
445			win_height = DisplayHeight(dpy, DefaultScreen(dpy));
446			#if DOUBLE_FRAME
447			grab_height *= 2;
448			#endif
449
450			// Open window
451			video = XtVaCreateManagedWidget("video", simpleWidgetClass, app_shell,
452			XtNwidth, win_width,
453			XtNheight, win_height,
454			NULL
455			);
456			XtRealizeWidget(app_shell);
457			XtVaSetValues(app_shell,
458			XtNtitle, "mintv",
459			NULL
460			);
461			XSetWMProtocols(XtDisplay(app_shell), XtWindow(app_shell), &wm, 1);
462			gc = XCreateGC(dpy, XtWindow(video), 0, NULL);
463
464			// Set image format
465			unsigned format = XV_FORMAT;
466
467			// Create image
468			image[0] = XvShmCreateImage(dpy, port, format, NULL, image_width, image_height, &shminfo);
469			image[1] = XvShmCreateImage(dpy, port, format, NULL, image_width, image_height, &shminfo);
470			shminfo.shmid = shmget(IPC_PRIVATE, image[0]->data_size * 2, IPC_CREAT \| 0777);
471			shminfo.shmaddr = (char *)shmat(shminfo.shmid, NULL, 0);
472			shminfo.readOnly = False;
473			image[0]->data = shminfo.shmaddr;
474			image[1]->data = shminfo.shmaddr + image[0]->data_size;
475			XShmAttach(dpy, &shminfo);
476			XSync(dpy, False);
477			shmctl(shminfo.shmid, IPC_RMID, 0);
478			memset(image[0]->data, 0x80, image[0]->data_size * 2);
479
480			// Open frame grabber device
481			fd = open("/dev/video0", O_RDWR);
482			if (fd < 0) {
483			fprintf(stderr, "Can't open /dev/video0: %s\n", strerror(errno));
484			exit(1);
485			}
486
487			// Set channel
488	cebix	1.2	set_channel();
489
490	cebix	1.1	video_audio au;
491			au.audio = 1;
492			if (ioctl(fd, VIDIOCGAUDIO, &au) < 0) {
493			fprintf(stderr, "ioctl VIDIOCGAUDIO: %s\n", strerror(errno));
494			exit(1);
495			}
496			au.flags &= ~VIDEO_AUDIO_MUTE;
497			if (ioctl(fd, VIDIOCSAUDIO, &au) < 0) {
498			fprintf(stderr, "ioctl VIDIOCSAUDIO: %s\n", strerror(errno));
499			exit(1);
500			}
501
502			// Configure frame grabber
503	cebix	1.2	set_bcc();
504	cebix	1.1
505			if (ioctl(fd, VIDIOCGMBUF, &mbuf) < 0) {
506			fprintf(stderr, "ioctl VIDIOCGMBUF: %s\n", strerror(errno));
507			exit(1);
508			}
509
510			buf = mmap(NULL, mbuf.size, PROT_READ \| PROT_WRITE, MAP_SHARED, fd, 0);
511			if (buf == NULL) {
512			fprintf(stderr, "mmap failed: %s\n", strerror(errno));
513			exit(1);
514			}
515
516			mm[0].frame = 0;
517			mm[0].width = grab_width;
518			mm[0].height = grab_height;
519			mm[0].format = VIDEO_PALETTE_YUV422;
520			mm[1].frame = 1;
521			mm[1].width = grab_width;
522			mm[1].height = grab_height;
523			mm[1].format = VIDEO_PALETTE_YUV422;
524			ioctl(fd, VIDIOCMCAPTURE, &(mm[bufnum]));
525
526			// Disable screen saver
527			XSetScreenSaver(dpy, 0, 0, DefaultBlanking, DefaultExposures);
528
529			// Main loop
530			XtAppAddWorkProc(app_context, work_proc, NULL);
531			XtAppMainLoop(app_context);
532
533			return 0;
534			}