Imported Debian version 2.5.2~trusty
[deb_ffmpeg.git] / ffmpeg / 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 #include "avdevice.h"
23
24 #undef __STRICT_ANSI__ //workaround due to broken kernel headers
25 #include "config.h"
26 #include "libavutil/rational.h"
27 #include "libavutil/imgutils.h"
28 #include "libavutil/log.h"
29 #include "libavutil/opt.h"
30 #include "libavformat/internal.h"
31 #include "libavcodec/dsputil.h"
32 #include <unistd.h>
33 #include <fcntl.h>
34 #include <sys/ioctl.h>
35 #include <sys/mman.h>
36 #include <sys/time.h>
37 #define _LINUX_TIME_H 1
38 #include <linux/videodev.h>
39 #include <time.h>
40
41 typedef struct {
42 AVClass *class;
43 int fd;
44 int frame_format; /* see VIDEO_PALETTE_xxx */
45 int use_mmap;
46 AVRational time_base;
47 int64_t time_frame;
48 int frame_size;
49 struct video_capability video_cap;
50 struct video_audio audio_saved;
51 struct video_window video_win;
52 uint8_t *video_buf;
53 struct video_mbuf gb_buffers;
54 struct video_mmap gb_buf;
55 int gb_frame;
56 int standard;
57 } VideoData;
58
59 static const struct {
60 int palette;
61 int depth;
62 enum AVPixelFormat pix_fmt;
63 } video_formats [] = {
64 {.palette = VIDEO_PALETTE_YUV420P, .depth = 12, .pix_fmt = AV_PIX_FMT_YUV420P },
65 {.palette = VIDEO_PALETTE_YUV422, .depth = 16, .pix_fmt = AV_PIX_FMT_YUYV422 },
66 {.palette = VIDEO_PALETTE_UYVY, .depth = 16, .pix_fmt = AV_PIX_FMT_UYVY422 },
67 {.palette = VIDEO_PALETTE_YUYV, .depth = 16, .pix_fmt = AV_PIX_FMT_YUYV422 },
68 /* NOTE: v4l uses BGR24, not RGB24 */
69 {.palette = VIDEO_PALETTE_RGB24, .depth = 24, .pix_fmt = AV_PIX_FMT_BGR24 },
70 {.palette = VIDEO_PALETTE_RGB565, .depth = 16, .pix_fmt = AV_PIX_FMT_BGR565 },
71 {.palette = VIDEO_PALETTE_GREY, .depth = 8, .pix_fmt = AV_PIX_FMT_GRAY8 },
72 };
73
74
75 static int grab_read_header(AVFormatContext *s1, AVFormatParameters *ap)
76 {
77 VideoData *s = s1->priv_data;
78 AVStream *st;
79 int video_fd;
80 int desired_palette, desired_depth;
81 struct video_tuner tuner;
82 struct video_audio audio;
83 struct video_picture pict;
84 int j;
85 int vformat_num = FF_ARRAY_ELEMS(video_formats);
86
87 av_log(s1, AV_LOG_WARNING, "V4L input device is deprecated and will be removed in the next release.");
88
89 if (ap->time_base.den <= 0) {
90 av_log(s1, AV_LOG_ERROR, "Wrong time base (%d)\n", ap->time_base.den);
91 return -1;
92 }
93 s->time_base = ap->time_base;
94
95 s->video_win.width = ap->width;
96 s->video_win.height = ap->height;
97
98 st = avformat_new_stream(s1, NULL);
99 if (!st)
100 return AVERROR(ENOMEM);
101 avpriv_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in us */
102
103 video_fd = open(s1->filename, O_RDWR);
104 if (video_fd < 0) {
105 av_log(s1, AV_LOG_ERROR, "%s: %s\n", s1->filename, strerror(errno));
106 goto fail;
107 }
108
109 if (ioctl(video_fd, VIDIOCGCAP, &s->video_cap) < 0) {
110 av_log(s1, AV_LOG_ERROR, "VIDIOCGCAP: %s\n", strerror(errno));
111 goto fail;
112 }
113
114 if (!(s->video_cap.type & VID_TYPE_CAPTURE)) {
115 av_log(s1, AV_LOG_ERROR, "Fatal: grab device does not handle capture\n");
116 goto fail;
117 }
118
119 /* no values set, autodetect them */
120 if (s->video_win.width <= 0 || s->video_win.height <= 0) {
121 if (ioctl(video_fd, VIDIOCGWIN, &s->video_win, sizeof(s->video_win)) < 0) {
122 av_log(s1, AV_LOG_ERROR, "VIDIOCGWIN: %s\n", strerror(errno));
123 goto fail;
124 }
125 }
126
127 if(av_image_check_size(s->video_win.width, s->video_win.height, 0, s1) < 0)
128 return -1;
129
130 desired_palette = -1;
131 desired_depth = -1;
132 for (j = 0; j < vformat_num; j++) {
133 if (ap->pix_fmt == video_formats[j].pix_fmt) {
134 desired_palette = video_formats[j].palette;
135 desired_depth = video_formats[j].depth;
136 break;
137 }
138 }
139
140 /* set tv standard */
141 if (!ioctl(video_fd, VIDIOCGTUNER, &tuner)) {
142 tuner.mode = s->standard;
143 ioctl(video_fd, VIDIOCSTUNER, &tuner);
144 }
145
146 /* unmute audio */
147 audio.audio = 0;
148 ioctl(video_fd, VIDIOCGAUDIO, &audio);
149 memcpy(&s->audio_saved, &audio, sizeof(audio));
150 audio.flags &= ~VIDEO_AUDIO_MUTE;
151 ioctl(video_fd, VIDIOCSAUDIO, &audio);
152
153 ioctl(video_fd, VIDIOCGPICT, &pict);
154 av_dlog(s1, "v4l: colour=%d hue=%d brightness=%d constrast=%d whiteness=%d\n",
155 pict.colour, pict.hue, pict.brightness, pict.contrast, pict.whiteness);
156 /* try to choose a suitable video format */
157 pict.palette = desired_palette;
158 pict.depth= desired_depth;
159 if (desired_palette == -1 || ioctl(video_fd, VIDIOCSPICT, &pict) < 0) {
160 for (j = 0; j < vformat_num; j++) {
161 pict.palette = video_formats[j].palette;
162 pict.depth = video_formats[j].depth;
163 if (-1 != ioctl(video_fd, VIDIOCSPICT, &pict))
164 break;
165 }
166 if (j >= vformat_num)
167 goto fail1;
168 }
169
170 if (ioctl(video_fd, VIDIOCGMBUF, &s->gb_buffers) < 0) {
171 /* try to use read based access */
172 int val;
173
174 s->video_win.x = 0;
175 s->video_win.y = 0;
176 s->video_win.chromakey = -1;
177 s->video_win.flags = 0;
178
179 if (ioctl(video_fd, VIDIOCSWIN, s->video_win) < 0) {
180 av_log(s1, AV_LOG_ERROR, "VIDIOCSWIN: %s\n", strerror(errno));
181 goto fail;
182 }
183
184 s->frame_format = pict.palette;
185
186 val = 1;
187 if (ioctl(video_fd, VIDIOCCAPTURE, &val) < 0) {
188 av_log(s1, AV_LOG_ERROR, "VIDIOCCAPTURE: %s\n", strerror(errno));
189 goto fail;
190 }
191
192 s->time_frame = av_gettime() * s->time_base.den / s->time_base.num;
193 s->use_mmap = 0;
194 } else {
195 s->video_buf = mmap(0, s->gb_buffers.size, PROT_READ|PROT_WRITE, MAP_SHARED, video_fd, 0);
196 if ((unsigned char*)-1 == s->video_buf) {
197 s->video_buf = mmap(0, s->gb_buffers.size, PROT_READ|PROT_WRITE, MAP_PRIVATE, video_fd, 0);
198 if ((unsigned char*)-1 == s->video_buf) {
199 av_log(s1, AV_LOG_ERROR, "mmap: %s\n", strerror(errno));
200 goto fail;
201 }
202 }
203 s->gb_frame = 0;
204 s->time_frame = av_gettime() * s->time_base.den / s->time_base.num;
205
206 /* start to grab the first frame */
207 s->gb_buf.frame = s->gb_frame % s->gb_buffers.frames;
208 s->gb_buf.height = s->video_win.height;
209 s->gb_buf.width = s->video_win.width;
210 s->gb_buf.format = pict.palette;
211
212 if (ioctl(video_fd, VIDIOCMCAPTURE, &s->gb_buf) < 0) {
213 if (errno != EAGAIN) {
214 fail1:
215 av_log(s1, AV_LOG_ERROR, "VIDIOCMCAPTURE: %s\n", strerror(errno));
216 } else {
217 av_log(s1, AV_LOG_ERROR, "Fatal: grab device does not receive any video signal\n");
218 }
219 goto fail;
220 }
221 for (j = 1; j < s->gb_buffers.frames; j++) {
222 s->gb_buf.frame = j;
223 ioctl(video_fd, VIDIOCMCAPTURE, &s->gb_buf);
224 }
225 s->frame_format = s->gb_buf.format;
226 s->use_mmap = 1;
227 }
228
229 for (j = 0; j < vformat_num; j++) {
230 if (s->frame_format == video_formats[j].palette) {
231 s->frame_size = s->video_win.width * s->video_win.height * video_formats[j].depth / 8;
232 st->codec->pix_fmt = video_formats[j].pix_fmt;
233 break;
234 }
235 }
236
237 if (j >= vformat_num)
238 goto fail;
239
240 s->fd = video_fd;
241
242 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
243 st->codec->codec_id = AV_CODEC_ID_RAWVIDEO;
244 st->codec->width = s->video_win.width;
245 st->codec->height = s->video_win.height;
246 st->codec->time_base = s->time_base;
247 st->codec->bit_rate = s->frame_size * 1/av_q2d(st->codec->time_base) * 8;
248
249 return 0;
250 fail:
251 if (video_fd >= 0)
252 close(video_fd);
253 return AVERROR(EIO);
254 }
255
256 static int v4l_mm_read_picture(VideoData *s, uint8_t *buf)
257 {
258 uint8_t *ptr;
259
260 while (ioctl(s->fd, VIDIOCSYNC, &s->gb_frame) < 0 &&
261 (errno == EAGAIN || errno == EINTR));
262
263 ptr = s->video_buf + s->gb_buffers.offsets[s->gb_frame];
264 memcpy(buf, ptr, s->frame_size);
265
266 /* Setup to capture the next frame */
267 s->gb_buf.frame = s->gb_frame;
268 if (ioctl(s->fd, VIDIOCMCAPTURE, &s->gb_buf) < 0) {
269 if (errno == EAGAIN)
270 av_log(NULL, AV_LOG_ERROR, "Cannot Sync\n");
271 else
272 av_log(NULL, AV_LOG_ERROR, "VIDIOCMCAPTURE: %s\n", strerror(errno));
273 return AVERROR(EIO);
274 }
275
276 /* This is now the grabbing frame */
277 s->gb_frame = (s->gb_frame + 1) % s->gb_buffers.frames;
278
279 return s->frame_size;
280 }
281
282 static int grab_read_packet(AVFormatContext *s1, AVPacket *pkt)
283 {
284 VideoData *s = s1->priv_data;
285 int64_t curtime, delay;
286 struct timespec ts;
287
288 /* Calculate the time of the next frame */
289 s->time_frame += INT64_C(1000000);
290
291 /* wait based on the frame rate */
292 for(;;) {
293 curtime = av_gettime();
294 delay = s->time_frame * s->time_base.num / s->time_base.den - curtime;
295 if (delay <= 0) {
296 if (delay < INT64_C(-1000000) * s->time_base.num / s->time_base.den) {
297 /* printf("grabbing is %d frames late (dropping)\n", (int) -(delay / 16666)); */
298 s->time_frame += INT64_C(1000000);
299 }
300 break;
301 }
302 ts.tv_sec = delay / 1000000;
303 ts.tv_nsec = (delay % 1000000) * 1000;
304 nanosleep(&ts, NULL);
305 }
306
307 if (av_new_packet(pkt, s->frame_size) < 0)
308 return AVERROR(EIO);
309
310 pkt->pts = curtime;
311
312 /* read one frame */
313 if (s->use_mmap) {
314 return v4l_mm_read_picture(s, pkt->data);
315 } else {
316 if (read(s->fd, pkt->data, pkt->size) != pkt->size)
317 return AVERROR(EIO);
318 return s->frame_size;
319 }
320 }
321
322 static int grab_read_close(AVFormatContext *s1)
323 {
324 VideoData *s = s1->priv_data;
325
326 if (s->use_mmap)
327 munmap(s->video_buf, s->gb_buffers.size);
328
329 /* mute audio. we must force it because the BTTV driver does not
330 return its state correctly */
331 s->audio_saved.flags |= VIDEO_AUDIO_MUTE;
332 ioctl(s->fd, VIDIOCSAUDIO, &s->audio_saved);
333
334 close(s->fd);
335 return 0;
336 }
337
338 static const AVOption options[] = {
339 { "standard", "", offsetof(VideoData, standard), AV_OPT_TYPE_INT, {.i64 = VIDEO_MODE_NTSC}, VIDEO_MODE_PAL, VIDEO_MODE_NTSC, AV_OPT_FLAG_DECODING_PARAM, "standard" },
340 { "PAL", "", 0, AV_OPT_TYPE_CONST, {.i64 = VIDEO_MODE_PAL}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
341 { "SECAM", "", 0, AV_OPT_TYPE_CONST, {.i64 = VIDEO_MODE_SECAM}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
342 { "NTSC", "", 0, AV_OPT_TYPE_CONST, {.i64 = VIDEO_MODE_NTSC}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
343 { NULL },
344 };
345
346 static const AVClass v4l_class = {
347 .class_name = "V4L indev",
348 .item_name = av_default_item_name,
349 .option = options,
350 .version = LIBAVUTIL_VERSION_INT,
351 .category = AV_CLASS_CATEGORY_DEVICE_VIDEO_INPUT,
352 };
353
354 AVInputFormat ff_v4l_demuxer = {
355 .name = "video4linux,v4l",
356 .long_name = NULL_IF_CONFIG_SMALL("Video4Linux device grab"),
357 .priv_data_size = sizeof(VideoData),
358 .read_header = grab_read_header,
359 .read_packet = grab_read_packet,
360 .read_close = grab_read_close,
361 .flags = AVFMT_NOFILE,
362 .priv_class = &v4l_class,
363 };