[libav.git] / libav / grab.c

/*
 * Linux video grab interface
 * Copyright (c) 2000,2001 Gerard Lantau.
 *
 * 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 <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <linux/videodev.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <errno.h>
#include <sys/time.h>

#include "avformat.h"

typedef struct {
    int fd;
    int frame_format; /* see VIDEO_PALETTE_xxx */
    int use_mmap;
    int width, height;
    float rate;
    INT64 time_frame;
} VideoData;

const char *v4l_device = "/dev/video";

/* XXX: move all that to the context */

static struct video_capability  video_cap;
static UINT8 *video_buf;
static struct video_mbuf gb_buffers;
static struct video_mmap gb_buf;
static struct video_audio audio;
static int gb_frame = 0;

static int v4l_init(URLContext *h)
{
    VideoData *s = h->priv_data;
    int width, height;
    int ret;
    int video_fd, frame_size;
    
    width = s->width;
    height = s->height;

    video_fd = open(v4l_device, O_RDWR);
    if (video_fd < 0) {
        perror(v4l_device);
        return -EIO;
    }
    
    if (ioctl(video_fd,VIDIOCGCAP,&video_cap) < 0) {
        perror("VIDIOCGCAP");
        goto fail;
    }

    if (!(video_cap.type & VID_TYPE_CAPTURE)) {
        fprintf(stderr, "Fatal: grab device does not handle capture\n");
        goto fail;
    }
    
    /* unmute audio */
    ioctl(video_fd, VIDIOCGAUDIO, &audio);
    audio.flags &= ~VIDEO_AUDIO_MUTE;
    ioctl(video_fd, VIDIOCSAUDIO, &audio);

    ret = ioctl(video_fd,VIDIOCGMBUF,&gb_buffers);
    if (ret < 0) {
        /* try to use read based access */
        struct video_window win;
        struct video_picture pict;
        int val;

        win.x = 0;
        win.y = 0;
        win.width = width;
        win.height = height;
        win.chromakey = -1;
        win.flags = 0;

        ioctl(video_fd, VIDIOCSWIN, &win);

        ioctl(video_fd, VIDIOCGPICT, &pict);
#if 0
        printf("v4l: colour=%d hue=%d brightness=%d constrast=%d whiteness=%d\n",
               pict.colour,
               pict.hue,
               pict.brightness,
               pict.contrast,
               pict.whiteness);
#endif        
        /* try to choose a suitable video format */
        pict.palette=VIDEO_PALETTE_YUV420P;
        ret = ioctl(video_fd, VIDIOCSPICT, &pict);
        if (ret < 0) {
            pict.palette=VIDEO_PALETTE_YUV422;
            ret = ioctl(video_fd, VIDIOCSPICT, &pict);
            if (ret < 0) {
                pict.palette=VIDEO_PALETTE_RGB24;
                ret = ioctl(video_fd, VIDIOCSPICT, &pict);
                if (ret < 0) 
                    goto fail1;
            }
        }

        s->frame_format = pict.palette;

        val = 1;
        ioctl(video_fd, VIDIOCCAPTURE, &val);

        s->time_frame = gettime();
        s->use_mmap = 0;
    } else {
        video_buf = mmap(0,gb_buffers.size,PROT_READ|PROT_WRITE,MAP_SHARED,video_fd,0);
        if ((unsigned char*)-1 == video_buf) {
            perror("mmap");
            goto fail;
        }
        gb_frame = 0;
        s->time_frame = gettime();
        
        /* start to grab the first frame */
        gb_buf.frame = 1 - gb_frame;
        gb_buf.height = height;
        gb_buf.width = width;
        gb_buf.format = VIDEO_PALETTE_YUV420P;
        
        ret = ioctl(video_fd, VIDIOCMCAPTURE, &gb_buf);
        if (ret < 0 && errno != EAGAIN) {
            /* try YUV422 */
            gb_buf.format = VIDEO_PALETTE_YUV422;
            
            ret = ioctl(video_fd, VIDIOCMCAPTURE, &gb_buf);
	    if (ret < 0 && errno != EAGAIN) {
		/* try RGB24 */
		gb_buf.format = VIDEO_PALETTE_RGB24;
		ret = ioctl(video_fd, VIDIOCMCAPTURE, &gb_buf);
	    }
        }
        if (ret < 0) {
            if (errno != EAGAIN) {
            fail1:
                fprintf(stderr, "Fatal: grab device does not support suitable format\n");
            } else {
                fprintf(stderr,"Fatal: grab device does not receive any video signal\n");
            }
            goto fail;
        }
        s->frame_format = gb_buf.format;
        s->use_mmap = 1;
    }

    switch(s->frame_format) {
    case VIDEO_PALETTE_YUV420P:
        frame_size = (width * height * 3) / 2;
        break;
    case VIDEO_PALETTE_YUV422:
        frame_size = width * height * 2;
        break;
    case VIDEO_PALETTE_RGB24:
        frame_size = width * height * 3;
        break;
    default:
        goto fail;
    }
    s->fd = video_fd;
    h->packet_size = frame_size;
    return 0;
 fail:
    close(video_fd);
    return -EIO;
}

static int v4l_mm_read_picture(URLContext *h, UINT8 *buf)
{
    VideoData *s = h->priv_data;
    UINT8 *ptr;

    gb_buf.frame = gb_frame;
    if (ioctl(s->fd, VIDIOCMCAPTURE, &gb_buf) < 0) {
	if (errno == EAGAIN)
	    fprintf(stderr,"Cannot Sync\n");
	else
            perror("VIDIOCMCAPTURE");
	return -EIO;
    }
    gb_frame = 1 - gb_frame;

    while (ioctl(s->fd, VIDIOCSYNC, &gb_frame) < 0 &&
           (errno == EAGAIN || errno == EINTR));

    ptr = video_buf + gb_buffers.offsets[gb_frame];
    memcpy(buf, ptr, h->packet_size);
    return h->packet_size;
}

/* note: we support only one picture read at a time */
static int video_read(URLContext *h, UINT8 *buf, int size)
{
    VideoData *s = h->priv_data;
    INT64 curtime;

    if (size != h->packet_size)
        return -EINVAL;

    /* wait based on the frame rate */
    s->time_frame += (int)(1000000 / s->rate);
    do {
        curtime = gettime();
    } while (curtime < s->time_frame);

    /* read one frame */
    if (s->use_mmap) {
        return v4l_mm_read_picture(h, buf);
    } else {
        if (read(s->fd, buf, size) != size)
            return -EIO;
        return h->packet_size;
    }
}

static int video_get_format(URLContext *h, URLFormat *f)
{
    VideoData *s = h->priv_data;

    f->width = s->width;
    f->height = s->height;
    f->frame_rate = (int)(s->rate * FRAME_RATE_BASE);
    strcpy(f->format_name, "rawvideo");

    switch(s->frame_format) {
    case VIDEO_PALETTE_YUV420P:
        f->pix_fmt = PIX_FMT_YUV420P;
        break;
    case VIDEO_PALETTE_YUV422:
        f->pix_fmt = PIX_FMT_YUV422;
        break;
    case VIDEO_PALETTE_RGB24:
        f->pix_fmt = PIX_FMT_BGR24; /* NOTE: v4l uses BGR24, not RGB24 ! */
        break;
    default:
        abort();
    }
    return 0;
}

/* URI syntax: 'video:width,height,rate'
 */
static int video_open(URLContext *h, const char *uri, int flags)
{
    VideoData *s;
    const char *p;
    int width, height;
    int ret;
    float rate;

    /* extract parameters */
    p = uri;
    strstart(p, "video:", &p);
    width = strtol(p, (char **)&p, 0);
    if (width <= 0)
        return -EINVAL;
    if (*p == ',')
        p++;
    height = strtol(p, (char **)&p, 0);
    if (height <= 0)
        return -EINVAL;
    if (*p == ',')
        p++;
    rate = strtod(p, (char **)&p);
    if (rate <= 0)
        return -EINVAL;

    s = malloc(sizeof(VideoData));
    if (!s)
        return -ENOMEM;
    h->priv_data = s;
    h->is_streamed = 1;
    s->width = width;
    s->height = height;
    s->rate = rate;
    ret = v4l_init(h);
    if (ret)
        free(s);
    return ret;
}

static int video_close(URLContext *h)
{
    VideoData *s = h->priv_data;

    close(s->fd);
    free(s);
    return 0;
}

URLProtocol video_protocol = {
    "video",
    video_open,
    video_read,
    NULL,
    NULL, /* seek */
    video_close,
    video_get_format,
};
Commit	Line	Data
de6d9b64 FB	1	/*
	2	* Linux video grab interface
	3	* Copyright (c) 2000,2001 Gerard Lantau.
	4	*
	5	* This program is free software; you can redistribute it and/or modify
	6	* it under the terms of the GNU General Public License as published by
	7	* the Free Software Foundation; either version 2 of the License, or
	8	* (at your option) any later version.
	9	*
	10	* This program is distributed in the hope that it will be useful,
	11	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	13	* GNU General Public License for more details.
	14	*
	15	* You should have received a copy of the GNU General Public License
	16	* along with this program; if not, write to the Free Software
	17	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	18	*/
	19	#include <stdlib.h>
	20	#include <stdio.h>
	21	#include <string.h>
	22	#include <linux/videodev.h>
	23	#include <unistd.h>
	24	#include <fcntl.h>
	25	#include <sys/ioctl.h>
	26	#include <sys/mman.h>
	27	#include <errno.h>
	28	#include <sys/time.h>
	29
	30	#include "avformat.h"
	31
	32	typedef struct {
	33	int fd;
	34	int frame_format; /* see VIDEO_PALETTE_xxx */
	35	int use_mmap;
	36	int width, height;
	37	float rate;
	38	INT64 time_frame;
	39	} VideoData;
	40
	41	const char *v4l_device = "/dev/video";
	42
	43	/* XXX: move all that to the context */
	44
	45	static struct video_capability video_cap;
	46	static UINT8 *video_buf;
	47	static struct video_mbuf gb_buffers;
	48	static struct video_mmap gb_buf;
	49	static struct video_audio audio;
	50	static int gb_frame = 0;
	51
	52	static int v4l_init(URLContext *h)
	53	{
	54	VideoData *s = h->priv_data;
	55	int width, height;
	56	int ret;
	57	int video_fd, frame_size;
	58
	59	width = s->width;
	60	height = s->height;
	61
	62	video_fd = open(v4l_device, O_RDWR);
	63	if (video_fd < 0) {
	64	perror(v4l_device);
65	return -EIO;
66	}
67
68	if (ioctl(video_fd,VIDIOCGCAP,&video_cap) < 0) {
69	perror("VIDIOCGCAP");
70	goto fail;
71	}
72
73	if (!(video_cap.type & VID_TYPE_CAPTURE)) {
74	fprintf(stderr, "Fatal: grab device does not handle capture\n");
75	goto fail;
76	}
77
78	/* unmute audio */
79	ioctl(video_fd, VIDIOCGAUDIO, &audio);
80	audio.flags &= ~VIDEO_AUDIO_MUTE;
81	ioctl(video_fd, VIDIOCSAUDIO, &audio);
82
83	ret = ioctl(video_fd,VIDIOCGMBUF,&gb_buffers);
84	if (ret < 0) {
85	/* try to use read based access */
86	struct video_window win;
87	struct video_picture pict;
88	int val;
89
90	win.x = 0;
91	win.y = 0;
92	win.width = width;
93	win.height = height;
94	win.chromakey = -1;
95	win.flags = 0;
96
97	ioctl(video_fd, VIDIOCSWIN, &win);
98
99	ioctl(video_fd, VIDIOCGPICT, &pict);
100	#if 0
101	printf("v4l: colour=%d hue=%d brightness=%d constrast=%d whiteness=%d\n",
102	pict.colour,
103	pict.hue,
104	pict.brightness,
105	pict.contrast,
106	pict.whiteness);
107	#endif
108	/* try to choose a suitable video format */
109	pict.palette=VIDEO_PALETTE_YUV420P;
110	ret = ioctl(video_fd, VIDIOCSPICT, &pict);
111	if (ret < 0) {
112	pict.palette=VIDEO_PALETTE_YUV422;
113	ret = ioctl(video_fd, VIDIOCSPICT, &pict);
114	if (ret < 0) {
115	pict.palette=VIDEO_PALETTE_RGB24;
116	ret = ioctl(video_fd, VIDIOCSPICT, &pict);
117	if (ret < 0)
118	goto fail1;
119	}
120	}
121
122	s->frame_format = pict.palette;
123
124	val = 1;
125	ioctl(video_fd, VIDIOCCAPTURE, &val);
126
127	s->time_frame = gettime();
128	s->use_mmap = 0;
129	} else {
130	video_buf = mmap(0,gb_buffers.size,PROT_READ\|PROT_WRITE,MAP_SHARED,video_fd,0);
131	if ((unsigned char*)-1 == video_buf) {
132	perror("mmap");
133	goto fail;
134	}
135	gb_frame = 0;
136	s->time_frame = gettime();
137
138	/* start to grab the first frame */
139	gb_buf.frame = 1 - gb_frame;
140	gb_buf.height = height;
141	gb_buf.width = width;
142	gb_buf.format = VIDEO_PALETTE_YUV420P;
143
144	ret = ioctl(video_fd, VIDIOCMCAPTURE, &gb_buf);
145	if (ret < 0 && errno != EAGAIN) {
146	/* try YUV422 */
147	gb_buf.format = VIDEO_PALETTE_YUV422;
148
149	ret = ioctl(video_fd, VIDIOCMCAPTURE, &gb_buf);
150	if (ret < 0 && errno != EAGAIN) {
151	/* try RGB24 */
152	gb_buf.format = VIDEO_PALETTE_RGB24;
153	ret = ioctl(video_fd, VIDIOCMCAPTURE, &gb_buf);
154	}
155	}
156	if (ret < 0) {
157	if (errno != EAGAIN) {
158	fail1:
159	fprintf(stderr, "Fatal: grab device does not support suitable format\n");
160	} else {
161	fprintf(stderr,"Fatal: grab device does not receive any video signal\n");
162	}
163	goto fail;
164	}
165	s->frame_format = gb_buf.format;
166	s->use_mmap = 1;
167	}
168
169	switch(s->frame_format) {
170	case VIDEO_PALETTE_YUV420P:
171	frame_size = (width * height * 3) / 2;
172	break;
173	case VIDEO_PALETTE_YUV422:
174	frame_size = width * height * 2;
175	break;
176	case VIDEO_PALETTE_RGB24:
177	frame_size = width * height * 3;
178	break;
179	default:
180	goto fail;
181	}
182	s->fd = video_fd;
183	h->packet_size = frame_size;
184	return 0;
185	fail:
186	close(video_fd);
187	return -EIO;
188	}
189
190	static int v4l_mm_read_picture(URLContext h, UINT8 buf)
191	{
192	VideoData *s = h->priv_data;
193	UINT8 *ptr;
194
195	gb_buf.frame = gb_frame;
196	if (ioctl(s->fd, VIDIOCMCAPTURE, &gb_buf) < 0) {
197	if (errno == EAGAIN)
198	fprintf(stderr,"Cannot Sync\n");
199	else
200	perror("VIDIOCMCAPTURE");
201	return -EIO;
202	}
203	gb_frame = 1 - gb_frame;
204
205	while (ioctl(s->fd, VIDIOCSYNC, &gb_frame) < 0 &&
206	(errno == EAGAIN \|\| errno == EINTR));
207
208	ptr = video_buf + gb_buffers.offsets[gb_frame];
209	memcpy(buf, ptr, h->packet_size);
210	return h->packet_size;
211	}
212
213	/* note: we support only one picture read at a time */
214	static int video_read(URLContext h, UINT8 buf, int size)
215	{
216	VideoData *s = h->priv_data;
217	INT64 curtime;
218
219	if (size != h->packet_size)
220	return -EINVAL;
221
222	/* wait based on the frame rate */
223	s->time_frame += (int)(1000000 / s->rate);
224	do {
225	curtime = gettime();
226	} while (curtime < s->time_frame);
227
228	/* read one frame */
229	if (s->use_mmap) {
230	return v4l_mm_read_picture(h, buf);
231	} else {
232	if (read(s->fd, buf, size) != size)
233	return -EIO;
234	return h->packet_size;
235	}
236	}
237
238	static int video_get_format(URLContext h, URLFormat f)
239	{
240	VideoData *s = h->priv_data;
241
242	f->width = s->width;
243	f->height = s->height;
244	f->frame_rate = (int)(s->rate * FRAME_RATE_BASE);
245	strcpy(f->format_name, "rawvideo");
246
247	switch(s->frame_format) {
248	case VIDEO_PALETTE_YUV420P:
249	f->pix_fmt = PIX_FMT_YUV420P;
250	break;
251	case VIDEO_PALETTE_YUV422:
252	f->pix_fmt = PIX_FMT_YUV422;
253	break;
254	case VIDEO_PALETTE_RGB24:
255	f->pix_fmt = PIX_FMT_BGR24; /* NOTE: v4l uses BGR24, not RGB24 ! */
256	break;
257	default:
258	abort();
259	}
260	return 0;
261	}
262
263	/* URI syntax: 'video:width,height,rate'
264	*/
265	static int video_open(URLContext h, const char uri, int flags)
266	{
267	VideoData *s;
268	const char *p;
269	int width, height;
270	int ret;
271	float rate;
272
273	/* extract parameters */
274	p = uri;
275	strstart(p, "video:", &p);
276	width = strtol(p, (char **)&p, 0);
277	if (width <= 0)
278	return -EINVAL;
279	if (*p == ',')
280	p++;
281	height = strtol(p, (char **)&p, 0);
282	if (height <= 0)
283	return -EINVAL;
284	if (*p == ',')
285	p++;
286	rate = strtod(p, (char **)&p);
287	if (rate <= 0)
288	return -EINVAL;
289
290	s = malloc(sizeof(VideoData));
291	if (!s)
292	return -ENOMEM;
293	h->priv_data = s;
294	h->is_streamed = 1;
295	s->width = width;
296	s->height = height;
297	s->rate = rate;
298	ret = v4l_init(h);
299	if (ret)
300	free(s);
301	return ret;
302	}
303
304	static int video_close(URLContext *h)
305	{
306	VideoData *s = h->priv_data;
307
308	close(s->fd);
309	free(s);
310	return 0;
311	}
312
313	URLProtocol video_protocol = {
314	"video",
315	video_open,
316	video_read,
317	NULL,
318	NULL, /* seek */
319	video_close,
320	video_get_format,
321	};