00001 /* 00002 * Linux video grab interface 00003 * Copyright (c) 2000,2001 Fabrice Bellard 00004 * 00005 * This file is part of FFmpeg. 00006 * 00007 * FFmpeg is free software; you can redistribute it and/or 00008 * modify it under the terms of the GNU Lesser General Public 00009 * License as published by the Free Software Foundation; either 00010 * version 2.1 of the License, or (at your option) any later version. 00011 * 00012 * FFmpeg is distributed in the hope that it will be useful, 00013 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00015 * Lesser General Public License for more details. 00016 * 00017 * You should have received a copy of the GNU Lesser General Public 00018 * License along with FFmpeg; if not, write to the Free Software 00019 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 00020 */ 00021 00022 #include "avdevice.h" 00023 00024 #undef __STRICT_ANSI__ //workaround due to broken kernel headers 00025 #include "config.h" 00026 #include "libavutil/rational.h" 00027 #include "libavutil/imgutils.h" 00028 #include "libavutil/log.h" 00029 #include "libavutil/opt.h" 00030 #include "libavformat/internal.h" 00031 #include "libavcodec/dsputil.h" 00032 #include <unistd.h> 00033 #include <fcntl.h> 00034 #include <sys/ioctl.h> 00035 #include <sys/mman.h> 00036 #include <sys/time.h> 00037 #define _LINUX_TIME_H 1 00038 #include <linux/videodev.h> 00039 #include <time.h> 00040 #include "avdevice.h" 00041 00042 typedef struct { 00043 AVClass *class; 00044 int fd; 00045 int frame_format; /* see VIDEO_PALETTE_xxx */ 00046 int use_mmap; 00047 AVRational time_base; 00048 int64_t time_frame; 00049 int frame_size; 00050 struct video_capability video_cap; 00051 struct video_audio audio_saved; 00052 struct video_window video_win; 00053 uint8_t *video_buf; 00054 struct video_mbuf gb_buffers; 00055 struct video_mmap gb_buf; 00056 int gb_frame; 00057 int standard; 00058 } VideoData; 00059 00060 static const struct { 00061 int palette; 00062 int depth; 00063 enum PixelFormat pix_fmt; 00064 } video_formats [] = { 00065 {.palette = VIDEO_PALETTE_YUV420P, .depth = 12, .pix_fmt = PIX_FMT_YUV420P }, 00066 {.palette = VIDEO_PALETTE_YUV422, .depth = 16, .pix_fmt = PIX_FMT_YUYV422 }, 00067 {.palette = VIDEO_PALETTE_UYVY, .depth = 16, .pix_fmt = PIX_FMT_UYVY422 }, 00068 {.palette = VIDEO_PALETTE_YUYV, .depth = 16, .pix_fmt = PIX_FMT_YUYV422 }, 00069 /* NOTE: v4l uses BGR24, not RGB24 */ 00070 {.palette = VIDEO_PALETTE_RGB24, .depth = 24, .pix_fmt = PIX_FMT_BGR24 }, 00071 {.palette = VIDEO_PALETTE_RGB565, .depth = 16, .pix_fmt = PIX_FMT_BGR565 }, 00072 {.palette = VIDEO_PALETTE_GREY, .depth = 8, .pix_fmt = PIX_FMT_GRAY8 }, 00073 }; 00074 00075 00076 static int grab_read_header(AVFormatContext *s1, AVFormatParameters *ap) 00077 { 00078 VideoData *s = s1->priv_data; 00079 AVStream *st; 00080 int video_fd; 00081 int desired_palette, desired_depth; 00082 struct video_tuner tuner; 00083 struct video_audio audio; 00084 struct video_picture pict; 00085 int j; 00086 int vformat_num = FF_ARRAY_ELEMS(video_formats); 00087 00088 av_log(s1, AV_LOG_WARNING, "V4L input device is deprecated and will be removed in the next release."); 00089 00090 if (ap->time_base.den <= 0) { 00091 av_log(s1, AV_LOG_ERROR, "Wrong time base (%d)\n", ap->time_base.den); 00092 return -1; 00093 } 00094 s->time_base = ap->time_base; 00095 00096 s->video_win.width = ap->width; 00097 s->video_win.height = ap->height; 00098 00099 st = avformat_new_stream(s1, NULL); 00100 if (!st) 00101 return AVERROR(ENOMEM); 00102 avpriv_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in us */ 00103 00104 video_fd = open(s1->filename, O_RDWR); 00105 if (video_fd < 0) { 00106 av_log(s1, AV_LOG_ERROR, "%s: %s\n", s1->filename, strerror(errno)); 00107 goto fail; 00108 } 00109 00110 if (ioctl(video_fd, VIDIOCGCAP, &s->video_cap) < 0) { 00111 av_log(s1, AV_LOG_ERROR, "VIDIOCGCAP: %s\n", strerror(errno)); 00112 goto fail; 00113 } 00114 00115 if (!(s->video_cap.type & VID_TYPE_CAPTURE)) { 00116 av_log(s1, AV_LOG_ERROR, "Fatal: grab device does not handle capture\n"); 00117 goto fail; 00118 } 00119 00120 /* no values set, autodetect them */ 00121 if (s->video_win.width <= 0 || s->video_win.height <= 0) { 00122 if (ioctl(video_fd, VIDIOCGWIN, &s->video_win, sizeof(s->video_win)) < 0) { 00123 av_log(s1, AV_LOG_ERROR, "VIDIOCGWIN: %s\n", strerror(errno)); 00124 goto fail; 00125 } 00126 } 00127 00128 if(av_image_check_size(s->video_win.width, s->video_win.height, 0, s1) < 0) 00129 return -1; 00130 00131 desired_palette = -1; 00132 desired_depth = -1; 00133 for (j = 0; j < vformat_num; j++) { 00134 if (ap->pix_fmt == video_formats[j].pix_fmt) { 00135 desired_palette = video_formats[j].palette; 00136 desired_depth = video_formats[j].depth; 00137 break; 00138 } 00139 } 00140 00141 /* set tv standard */ 00142 if (!ioctl(video_fd, VIDIOCGTUNER, &tuner)) { 00143 tuner.mode = s->standard; 00144 ioctl(video_fd, VIDIOCSTUNER, &tuner); 00145 } 00146 00147 /* unmute audio */ 00148 audio.audio = 0; 00149 ioctl(video_fd, VIDIOCGAUDIO, &audio); 00150 memcpy(&s->audio_saved, &audio, sizeof(audio)); 00151 audio.flags &= ~VIDEO_AUDIO_MUTE; 00152 ioctl(video_fd, VIDIOCSAUDIO, &audio); 00153 00154 ioctl(video_fd, VIDIOCGPICT, &pict); 00155 av_dlog(s1, "v4l: colour=%d hue=%d brightness=%d constrast=%d whiteness=%d\n", 00156 pict.colour, pict.hue, pict.brightness, pict.contrast, pict.whiteness); 00157 /* try to choose a suitable video format */ 00158 pict.palette = desired_palette; 00159 pict.depth= desired_depth; 00160 if (desired_palette == -1 || ioctl(video_fd, VIDIOCSPICT, &pict) < 0) { 00161 for (j = 0; j < vformat_num; j++) { 00162 pict.palette = video_formats[j].palette; 00163 pict.depth = video_formats[j].depth; 00164 if (-1 != ioctl(video_fd, VIDIOCSPICT, &pict)) 00165 break; 00166 } 00167 if (j >= vformat_num) 00168 goto fail1; 00169 } 00170 00171 if (ioctl(video_fd, VIDIOCGMBUF, &s->gb_buffers) < 0) { 00172 /* try to use read based access */ 00173 int val; 00174 00175 s->video_win.x = 0; 00176 s->video_win.y = 0; 00177 s->video_win.chromakey = -1; 00178 s->video_win.flags = 0; 00179 00180 if (ioctl(video_fd, VIDIOCSWIN, s->video_win) < 0) { 00181 av_log(s1, AV_LOG_ERROR, "VIDIOCSWIN: %s\n", strerror(errno)); 00182 goto fail; 00183 } 00184 00185 s->frame_format = pict.palette; 00186 00187 val = 1; 00188 if (ioctl(video_fd, VIDIOCCAPTURE, &val) < 0) { 00189 av_log(s1, AV_LOG_ERROR, "VIDIOCCAPTURE: %s\n", strerror(errno)); 00190 goto fail; 00191 } 00192 00193 s->time_frame = av_gettime() * s->time_base.den / s->time_base.num; 00194 s->use_mmap = 0; 00195 } else { 00196 s->video_buf = mmap(0, s->gb_buffers.size, PROT_READ|PROT_WRITE, MAP_SHARED, video_fd, 0); 00197 if ((unsigned char*)-1 == s->video_buf) { 00198 s->video_buf = mmap(0, s->gb_buffers.size, PROT_READ|PROT_WRITE, MAP_PRIVATE, video_fd, 0); 00199 if ((unsigned char*)-1 == s->video_buf) { 00200 av_log(s1, AV_LOG_ERROR, "mmap: %s\n", strerror(errno)); 00201 goto fail; 00202 } 00203 } 00204 s->gb_frame = 0; 00205 s->time_frame = av_gettime() * s->time_base.den / s->time_base.num; 00206 00207 /* start to grab the first frame */ 00208 s->gb_buf.frame = s->gb_frame % s->gb_buffers.frames; 00209 s->gb_buf.height = s->video_win.height; 00210 s->gb_buf.width = s->video_win.width; 00211 s->gb_buf.format = pict.palette; 00212 00213 if (ioctl(video_fd, VIDIOCMCAPTURE, &s->gb_buf) < 0) { 00214 if (errno != EAGAIN) { 00215 fail1: 00216 av_log(s1, AV_LOG_ERROR, "VIDIOCMCAPTURE: %s\n", strerror(errno)); 00217 } else { 00218 av_log(s1, AV_LOG_ERROR, "Fatal: grab device does not receive any video signal\n"); 00219 } 00220 goto fail; 00221 } 00222 for (j = 1; j < s->gb_buffers.frames; j++) { 00223 s->gb_buf.frame = j; 00224 ioctl(video_fd, VIDIOCMCAPTURE, &s->gb_buf); 00225 } 00226 s->frame_format = s->gb_buf.format; 00227 s->use_mmap = 1; 00228 } 00229 00230 for (j = 0; j < vformat_num; j++) { 00231 if (s->frame_format == video_formats[j].palette) { 00232 s->frame_size = s->video_win.width * s->video_win.height * video_formats[j].depth / 8; 00233 st->codec->pix_fmt = video_formats[j].pix_fmt; 00234 break; 00235 } 00236 } 00237 00238 if (j >= vformat_num) 00239 goto fail; 00240 00241 s->fd = video_fd; 00242 00243 st->codec->codec_type = AVMEDIA_TYPE_VIDEO; 00244 st->codec->codec_id = CODEC_ID_RAWVIDEO; 00245 st->codec->width = s->video_win.width; 00246 st->codec->height = s->video_win.height; 00247 st->codec->time_base = s->time_base; 00248 st->codec->bit_rate = s->frame_size * 1/av_q2d(st->codec->time_base) * 8; 00249 00250 return 0; 00251 fail: 00252 if (video_fd >= 0) 00253 close(video_fd); 00254 return AVERROR(EIO); 00255 } 00256 00257 static int v4l_mm_read_picture(VideoData *s, uint8_t *buf) 00258 { 00259 uint8_t *ptr; 00260 00261 while (ioctl(s->fd, VIDIOCSYNC, &s->gb_frame) < 0 && 00262 (errno == EAGAIN || errno == EINTR)); 00263 00264 ptr = s->video_buf + s->gb_buffers.offsets[s->gb_frame]; 00265 memcpy(buf, ptr, s->frame_size); 00266 00267 /* Setup to capture the next frame */ 00268 s->gb_buf.frame = s->gb_frame; 00269 if (ioctl(s->fd, VIDIOCMCAPTURE, &s->gb_buf) < 0) { 00270 if (errno == EAGAIN) 00271 av_log(NULL, AV_LOG_ERROR, "Cannot Sync\n"); 00272 else 00273 av_log(NULL, AV_LOG_ERROR, "VIDIOCMCAPTURE: %s\n", strerror(errno)); 00274 return AVERROR(EIO); 00275 } 00276 00277 /* This is now the grabbing frame */ 00278 s->gb_frame = (s->gb_frame + 1) % s->gb_buffers.frames; 00279 00280 return s->frame_size; 00281 } 00282 00283 static int grab_read_packet(AVFormatContext *s1, AVPacket *pkt) 00284 { 00285 VideoData *s = s1->priv_data; 00286 int64_t curtime, delay; 00287 struct timespec ts; 00288 00289 /* Calculate the time of the next frame */ 00290 s->time_frame += INT64_C(1000000); 00291 00292 /* wait based on the frame rate */ 00293 for(;;) { 00294 curtime = av_gettime(); 00295 delay = s->time_frame * s->time_base.num / s->time_base.den - curtime; 00296 if (delay <= 0) { 00297 if (delay < INT64_C(-1000000) * s->time_base.num / s->time_base.den) { 00298 /* printf("grabbing is %d frames late (dropping)\n", (int) -(delay / 16666)); */ 00299 s->time_frame += INT64_C(1000000); 00300 } 00301 break; 00302 } 00303 ts.tv_sec = delay / 1000000; 00304 ts.tv_nsec = (delay % 1000000) * 1000; 00305 nanosleep(&ts, NULL); 00306 } 00307 00308 if (av_new_packet(pkt, s->frame_size) < 0) 00309 return AVERROR(EIO); 00310 00311 pkt->pts = curtime; 00312 00313 /* read one frame */ 00314 if (s->use_mmap) { 00315 return v4l_mm_read_picture(s, pkt->data); 00316 } else { 00317 if (read(s->fd, pkt->data, pkt->size) != pkt->size) 00318 return AVERROR(EIO); 00319 return s->frame_size; 00320 } 00321 } 00322 00323 static int grab_read_close(AVFormatContext *s1) 00324 { 00325 VideoData *s = s1->priv_data; 00326 00327 if (s->use_mmap) 00328 munmap(s->video_buf, s->gb_buffers.size); 00329 00330 /* mute audio. we must force it because the BTTV driver does not 00331 return its state correctly */ 00332 s->audio_saved.flags |= VIDEO_AUDIO_MUTE; 00333 ioctl(s->fd, VIDIOCSAUDIO, &s->audio_saved); 00334 00335 close(s->fd); 00336 return 0; 00337 } 00338 00339 static const AVOption options[] = { 00340 { "standard", "", offsetof(VideoData, standard), AV_OPT_TYPE_INT, {.dbl = VIDEO_MODE_NTSC}, VIDEO_MODE_PAL, VIDEO_MODE_NTSC, AV_OPT_FLAG_DECODING_PARAM, "standard" }, 00341 { "PAL", "", 0, AV_OPT_TYPE_CONST, {.dbl = VIDEO_MODE_PAL}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" }, 00342 { "SECAM", "", 0, AV_OPT_TYPE_CONST, {.dbl = VIDEO_MODE_SECAM}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" }, 00343 { "NTSC", "", 0, AV_OPT_TYPE_CONST, {.dbl = VIDEO_MODE_NTSC}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" }, 00344 { NULL }, 00345 }; 00346 00347 static const AVClass v4l_class = { 00348 .class_name = "V4L indev", 00349 .item_name = av_default_item_name, 00350 .option = options, 00351 .version = LIBAVUTIL_VERSION_INT, 00352 }; 00353 00354 AVInputFormat ff_v4l_demuxer = { 00355 .name = "video4linux,v4l", 00356 .long_name = NULL_IF_CONFIG_SMALL("Video4Linux device grab"), 00357 .priv_data_size = sizeof(VideoData), 00358 .read_header = grab_read_header, 00359 .read_packet = grab_read_packet, 00360 .read_close = grab_read_close, 00361 .flags = AVFMT_NOFILE, 00362 .priv_class = &v4l_class, 00363 };