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  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. };
  352.  
  353. AVInputFormat ff_v4l_demuxer = {
  354.     .name           = "video4linux,v4l",
  355.     .long_name      = NULL_IF_CONFIG_SMALL("Video4Linux device grab"),
  356.     .priv_data_size = sizeof(VideoData),
  357.     .read_header    = grab_read_header,
  358.     .read_packet    = grab_read_packet,
  359.     .read_close     = grab_read_close,
  360.     .flags          = AVFMT_NOFILE,
  361.     .priv_class     = &v4l_class,
  362. };
  363.