Add entry for AVFilterPicRef interlaced and top_field_first fields
[libav.git] / libavdevice / v4l.c
1 /*
2 * Linux video grab interface
3 * Copyright (c) 2000,2001 Fabrice Bellard
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 #undef __STRICT_ANSI__ //workaround due to broken kernel headers
23 #include "config.h"
24 #include "libavutil/rational.h"
25 #include "libavformat/avformat.h"
26 #include "libavcodec/dsputil.h"
27 #include <unistd.h>
28 #include <fcntl.h>
29 #include <sys/ioctl.h>
30 #include <sys/mman.h>
31 #include <sys/time.h>
32 #define _LINUX_TIME_H 1
33 #include <linux/videodev.h>
34 #include <time.h>
35 #include <strings.h>
36
37 typedef struct {
38 int fd;
39 int frame_format; /* see VIDEO_PALETTE_xxx */
40 int use_mmap;
41 AVRational time_base;
42 int64_t time_frame;
43 int frame_size;
44 struct video_capability video_cap;
45 struct video_audio audio_saved;
46 struct video_window video_win;
47 uint8_t *video_buf;
48 struct video_mbuf gb_buffers;
49 struct video_mmap gb_buf;
50 int gb_frame;
51 } VideoData;
52
53 static const struct {
54 int palette;
55 int depth;
56 enum PixelFormat pix_fmt;
57 } video_formats [] = {
58 {.palette = VIDEO_PALETTE_YUV420P, .depth = 12, .pix_fmt = PIX_FMT_YUV420P },
59 {.palette = VIDEO_PALETTE_YUV422, .depth = 16, .pix_fmt = PIX_FMT_YUYV422 },
60 {.palette = VIDEO_PALETTE_UYVY, .depth = 16, .pix_fmt = PIX_FMT_UYVY422 },
61 {.palette = VIDEO_PALETTE_YUYV, .depth = 16, .pix_fmt = PIX_FMT_YUYV422 },
62 /* NOTE: v4l uses BGR24, not RGB24 */
63 {.palette = VIDEO_PALETTE_RGB24, .depth = 24, .pix_fmt = PIX_FMT_BGR24 },
64 {.palette = VIDEO_PALETTE_RGB565, .depth = 16, .pix_fmt = PIX_FMT_BGR565 },
65 {.palette = VIDEO_PALETTE_GREY, .depth = 8, .pix_fmt = PIX_FMT_GRAY8 },
66 };
67
68
69 static int grab_read_header(AVFormatContext *s1, AVFormatParameters *ap)
70 {
71 VideoData *s = s1->priv_data;
72 AVStream *st;
73 int video_fd;
74 int desired_palette, desired_depth;
75 struct video_tuner tuner;
76 struct video_audio audio;
77 struct video_picture pict;
78 int j;
79 int vformat_num = FF_ARRAY_ELEMS(video_formats);
80
81 if (ap->time_base.den <= 0) {
82 av_log(s1, AV_LOG_ERROR, "Wrong time base (%d)\n", ap->time_base.den);
83 return -1;
84 }
85 s->time_base = ap->time_base;
86
87 s->video_win.width = ap->width;
88 s->video_win.height = ap->height;
89
90 st = av_new_stream(s1, 0);
91 if (!st)
92 return AVERROR(ENOMEM);
93 av_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in us */
94
95 video_fd = open(s1->filename, O_RDWR);
96 if (video_fd < 0) {
97 av_log(s1, AV_LOG_ERROR, "%s: %s\n", s1->filename, strerror(errno));
98 goto fail;
99 }
100
101 if (ioctl(video_fd, VIDIOCGCAP, &s->video_cap) < 0) {
102 av_log(s1, AV_LOG_ERROR, "VIDIOCGCAP: %s\n", strerror(errno));
103 goto fail;
104 }
105
106 if (!(s->video_cap.type & VID_TYPE_CAPTURE)) {
107 av_log(s1, AV_LOG_ERROR, "Fatal: grab device does not handle capture\n");
108 goto fail;
109 }
110
111 /* no values set, autodetect them */
112 if (s->video_win.width <= 0 || s->video_win.height <= 0) {
113 if (ioctl(video_fd, VIDIOCGWIN, &s->video_win, sizeof(s->video_win)) < 0) {
114 av_log(s1, AV_LOG_ERROR, "VIDIOCGWIN: %s\n", strerror(errno));
115 goto fail;
116 }
117 }
118
119 if(avcodec_check_dimensions(s1, s->video_win.width, s->video_win.height) < 0)
120 return -1;
121
122 desired_palette = -1;
123 desired_depth = -1;
124 for (j = 0; j < vformat_num; j++) {
125 if (ap->pix_fmt == video_formats[j].pix_fmt) {
126 desired_palette = video_formats[j].palette;
127 desired_depth = video_formats[j].depth;
128 break;
129 }
130 }
131
132 /* set tv standard */
133 if (ap->standard && !ioctl(video_fd, VIDIOCGTUNER, &tuner)) {
134 if (!strcasecmp(ap->standard, "pal"))
135 tuner.mode = VIDEO_MODE_PAL;
136 else if (!strcasecmp(ap->standard, "secam"))
137 tuner.mode = VIDEO_MODE_SECAM;
138 else
139 tuner.mode = VIDEO_MODE_NTSC;
140 ioctl(video_fd, VIDIOCSTUNER, &tuner);
141 }
142
143 /* unmute audio */
144 audio.audio = 0;
145 ioctl(video_fd, VIDIOCGAUDIO, &audio);
146 memcpy(&s->audio_saved, &audio, sizeof(audio));
147 audio.flags &= ~VIDEO_AUDIO_MUTE;
148 ioctl(video_fd, VIDIOCSAUDIO, &audio);
149
150 ioctl(video_fd, VIDIOCGPICT, &pict);
151 #if 0
152 printf("v4l: colour=%d hue=%d brightness=%d constrast=%d whiteness=%d\n",
153 pict.colour,
154 pict.hue,
155 pict.brightness,
156 pict.contrast,
157 pict.whiteness);
158 #endif
159 /* try to choose a suitable video format */
160 pict.palette = desired_palette;
161 pict.depth= desired_depth;
162 if (desired_palette == -1 || ioctl(video_fd, VIDIOCSPICT, &pict) < 0) {
163 for (j = 0; j < vformat_num; j++) {
164 pict.palette = video_formats[j].palette;
165 pict.depth = video_formats[j].depth;
166 if (-1 != ioctl(video_fd, VIDIOCSPICT, &pict))
167 break;
168 }
169 if (j >= vformat_num)
170 goto fail1;
171 }
172
173 if (ioctl(video_fd, VIDIOCGMBUF, &s->gb_buffers) < 0) {
174 /* try to use read based access */
175 int val;
176
177 s->video_win.x = 0;
178 s->video_win.y = 0;
179 s->video_win.chromakey = -1;
180 s->video_win.flags = 0;
181
182 if (ioctl(video_fd, VIDIOCSWIN, s->video_win) < 0) {
183 av_log(s1, AV_LOG_ERROR, "VIDIOCSWIN: %s\n", strerror(errno));
184 goto fail;
185 }
186
187 s->frame_format = pict.palette;
188
189 val = 1;
190 if (ioctl(video_fd, VIDIOCCAPTURE, &val) < 0) {
191 av_log(s1, AV_LOG_ERROR, "VIDIOCCAPTURE: %s\n", strerror(errno));
192 goto fail;
193 }
194
195 s->time_frame = av_gettime() * s->time_base.den / s->time_base.num;
196 s->use_mmap = 0;
197 } else {
198 s->video_buf = mmap(0, s->gb_buffers.size, PROT_READ|PROT_WRITE, MAP_SHARED, video_fd, 0);
199 if ((unsigned char*)-1 == s->video_buf) {
200 s->video_buf = mmap(0, s->gb_buffers.size, PROT_READ|PROT_WRITE, MAP_PRIVATE, video_fd, 0);
201 if ((unsigned char*)-1 == s->video_buf) {
202 av_log(s1, AV_LOG_ERROR, "mmap: %s\n", strerror(errno));
203 goto fail;
204 }
205 }
206 s->gb_frame = 0;
207 s->time_frame = av_gettime() * s->time_base.den / s->time_base.num;
208
209 /* start to grab the first frame */
210 s->gb_buf.frame = s->gb_frame % s->gb_buffers.frames;
211 s->gb_buf.height = s->video_win.height;
212 s->gb_buf.width = s->video_win.width;
213 s->gb_buf.format = pict.palette;
214
215 if (ioctl(video_fd, VIDIOCMCAPTURE, &s->gb_buf) < 0) {
216 if (errno != EAGAIN) {
217 fail1:
218 av_log(s1, AV_LOG_ERROR, "VIDIOCMCAPTURE: %s\n", strerror(errno));
219 } else {
220 av_log(s1, AV_LOG_ERROR, "Fatal: grab device does not receive any video signal\n");
221 }
222 goto fail;
223 }
224 for (j = 1; j < s->gb_buffers.frames; j++) {
225 s->gb_buf.frame = j;
226 ioctl(video_fd, VIDIOCMCAPTURE, &s->gb_buf);
227 }
228 s->frame_format = s->gb_buf.format;
229 s->use_mmap = 1;
230 }
231
232 for (j = 0; j < vformat_num; j++) {
233 if (s->frame_format == video_formats[j].palette) {
234 s->frame_size = s->video_win.width * s->video_win.height * video_formats[j].depth / 8;
235 st->codec->pix_fmt = video_formats[j].pix_fmt;
236 break;
237 }
238 }
239
240 if (j >= vformat_num)
241 goto fail;
242
243 s->fd = video_fd;
244
245 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
246 st->codec->codec_id = CODEC_ID_RAWVIDEO;
247 st->codec->width = s->video_win.width;
248 st->codec->height = s->video_win.height;
249 st->codec->time_base = s->time_base;
250 st->codec->bit_rate = s->frame_size * 1/av_q2d(st->codec->time_base) * 8;
251
252 return 0;
253 fail:
254 if (video_fd >= 0)
255 close(video_fd);
256 return AVERROR(EIO);
257 }
258
259 static int v4l_mm_read_picture(VideoData *s, uint8_t *buf)
260 {
261 uint8_t *ptr;
262
263 while (ioctl(s->fd, VIDIOCSYNC, &s->gb_frame) < 0 &&
264 (errno == EAGAIN || errno == EINTR));
265
266 ptr = s->video_buf + s->gb_buffers.offsets[s->gb_frame];
267 memcpy(buf, ptr, s->frame_size);
268
269 /* Setup to capture the next frame */
270 s->gb_buf.frame = s->gb_frame;
271 if (ioctl(s->fd, VIDIOCMCAPTURE, &s->gb_buf) < 0) {
272 if (errno == EAGAIN)
273 av_log(NULL, AV_LOG_ERROR, "Cannot Sync\n");
274 else
275 av_log(NULL, AV_LOG_ERROR, "VIDIOCMCAPTURE: %s\n", strerror(errno));
276 return AVERROR(EIO);
277 }
278
279 /* This is now the grabbing frame */
280 s->gb_frame = (s->gb_frame + 1) % s->gb_buffers.frames;
281
282 return s->frame_size;
283 }
284
285 static int grab_read_packet(AVFormatContext *s1, AVPacket *pkt)
286 {
287 VideoData *s = s1->priv_data;
288 int64_t curtime, delay;
289 struct timespec ts;
290
291 /* Calculate the time of the next frame */
292 s->time_frame += INT64_C(1000000);
293
294 /* wait based on the frame rate */
295 for(;;) {
296 curtime = av_gettime();
297 delay = s->time_frame * s->time_base.num / s->time_base.den - curtime;
298 if (delay <= 0) {
299 if (delay < INT64_C(-1000000) * s->time_base.num / s->time_base.den) {
300 /* printf("grabbing is %d frames late (dropping)\n", (int) -(delay / 16666)); */
301 s->time_frame += INT64_C(1000000);
302 }
303 break;
304 }
305 ts.tv_sec = delay / 1000000;
306 ts.tv_nsec = (delay % 1000000) * 1000;
307 nanosleep(&ts, NULL);
308 }
309
310 if (av_new_packet(pkt, s->frame_size) < 0)
311 return AVERROR(EIO);
312
313 pkt->pts = curtime;
314
315 /* read one frame */
316 if (s->use_mmap) {
317 return v4l_mm_read_picture(s, pkt->data);
318 } else {
319 if (read(s->fd, pkt->data, pkt->size) != pkt->size)
320 return AVERROR(EIO);
321 return s->frame_size;
322 }
323 }
324
325 static int grab_read_close(AVFormatContext *s1)
326 {
327 VideoData *s = s1->priv_data;
328
329 if (s->use_mmap)
330 munmap(s->video_buf, s->gb_buffers.size);
331
332 /* mute audio. we must force it because the BTTV driver does not
333 return its state correctly */
334 s->audio_saved.flags |= VIDEO_AUDIO_MUTE;
335 ioctl(s->fd, VIDIOCSAUDIO, &s->audio_saved);
336
337 close(s->fd);
338 return 0;
339 }
340
341 AVInputFormat v4l_demuxer = {
342 "video4linux",
343 NULL_IF_CONFIG_SMALL("Video4Linux device grab"),
344 sizeof(VideoData),
345 NULL,
346 grab_read_header,
347 grab_read_packet,
348 grab_read_close,
349 .flags = AVFMT_NOFILE,
350 };