| 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 | }; |