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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/internal.h"
  29. #include "libavutil/log.h"
  30. #include "libavutil/opt.h"
  31. #include "libavformat/internal.h"
  32. #include "libavcodec/dsputil.h"
  33. #include <unistd.h>
  34. #include <fcntl.h>
  35. #include <sys/ioctl.h>
  36. #include <sys/mman.h>
  37. #include <sys/time.h>
  38. #define _LINUX_TIME_H 1
  39. #include <linux/videodev.h>
  40. #include <time.h>
  41.  
  42. typedef struct {
  43.     AVClass *class;
  44.     int fd;
  45.     int frame_format; /* see VIDEO_PALETTE_xxx */
  46.     int use_mmap;
  47.     AVRational time_base;
  48.     int64_t time_frame;
  49.     int frame_size;
  50.     struct video_capability video_cap;
  51.     struct video_audio audio_saved;
  52.     struct video_window video_win;
  53.     uint8_t *video_buf;
  54.     struct video_mbuf gb_buffers;
  55.     struct video_mmap gb_buf;
  56.     int gb_frame;
  57.     int standard;
  58. } VideoData;
  59.  
  60. static const struct {
  61.     int palette;
  62.     int depth;
  63.     enum AVPixelFormat pix_fmt;
  64. } video_formats [] = {
  65.     {.palette = VIDEO_PALETTE_YUV420P, .depth = 12, .pix_fmt = AV_PIX_FMT_YUV420P },
  66.     {.palette = VIDEO_PALETTE_YUV422,  .depth = 16, .pix_fmt = AV_PIX_FMT_YUYV422 },
  67.     {.palette = VIDEO_PALETTE_UYVY,    .depth = 16, .pix_fmt = AV_PIX_FMT_UYVY422 },
  68.     {.palette = VIDEO_PALETTE_YUYV,    .depth = 16, .pix_fmt = AV_PIX_FMT_YUYV422 },
  69.     /* NOTE: v4l uses BGR24, not RGB24 */
  70.     {.palette = VIDEO_PALETTE_RGB24,   .depth = 24, .pix_fmt = AV_PIX_FMT_BGR24   },
  71.     {.palette = VIDEO_PALETTE_RGB565,  .depth = 16, .pix_fmt = AV_PIX_FMT_BGR565  },
  72.     {.palette = VIDEO_PALETTE_GREY,    .depth = 8,  .pix_fmt = AV_PIX_FMT_GRAY8   },
  73. };
  74.  
  75.  
  76. static int grab_read_header(AVFormatContext *s1, AVFormatParameters *ap)
  77. {
  78.     VideoData *s = s1->priv_data;
  79.     AVStream *st;
  80.     int video_fd;
  81.     int desired_palette, desired_depth;
  82.     struct video_tuner tuner;
  83.     struct video_audio audio;
  84.     struct video_picture pict;
  85.     int j;
  86.     int vformat_num = FF_ARRAY_ELEMS(video_formats);
  87.  
  88.     av_log(s1, AV_LOG_WARNING, "V4L input device is deprecated and will be removed in the next release.");
  89.  
  90.     if (ap->time_base.den <= 0) {
  91.         av_log(s1, AV_LOG_ERROR, "Wrong time base (%d)\n", ap->time_base.den);
  92.         return -1;
  93.     }
  94.     s->time_base = ap->time_base;
  95.  
  96.     s->video_win.width = ap->width;
  97.     s->video_win.height = ap->height;
  98.  
  99.     st = avformat_new_stream(s1, NULL);
  100.     if (!st)
  101.         return AVERROR(ENOMEM);
  102.     avpriv_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in us */
  103.  
  104.     video_fd = open(s1->filename, O_RDWR);
  105.     if (video_fd < 0) {
  106.         av_log(s1, AV_LOG_ERROR, "%s: %s\n", s1->filename, strerror(errno));
  107.         goto fail;
  108.     }
  109.  
  110.     if (ioctl(video_fd, VIDIOCGCAP, &s->video_cap) < 0) {
  111.         av_log(s1, AV_LOG_ERROR, "VIDIOCGCAP: %s\n", strerror(errno));
  112.         goto fail;
  113.     }
  114.  
  115.     if (!(s->video_cap.type & VID_TYPE_CAPTURE)) {
  116.         av_log(s1, AV_LOG_ERROR, "Fatal: grab device does not handle capture\n");
  117.         goto fail;
  118.     }
  119.  
  120.     /* no values set, autodetect them */
  121.     if (s->video_win.width <= 0 || s->video_win.height <= 0) {
  122.         if (ioctl(video_fd, VIDIOCGWIN, &s->video_win, sizeof(s->video_win)) < 0) {
  123.             av_log(s1, AV_LOG_ERROR, "VIDIOCGWIN: %s\n", strerror(errno));
  124.             goto fail;
  125.         }
  126.     }
  127.  
  128.     if(av_image_check_size(s->video_win.width, s->video_win.height, 0, s1) < 0)
  129.         return -1;
  130.  
  131.     desired_palette = -1;
  132.     desired_depth = -1;
  133.     for (j = 0; j < vformat_num; j++) {
  134.         if (ap->pix_fmt == video_formats[j].pix_fmt) {
  135.             desired_palette = video_formats[j].palette;
  136.             desired_depth = video_formats[j].depth;
  137.             break;
  138.         }
  139.     }
  140.  
  141.     /* set tv standard */
  142.     if (!ioctl(video_fd, VIDIOCGTUNER, &tuner)) {
  143.         tuner.mode = s->standard;
  144.         ioctl(video_fd, VIDIOCSTUNER, &tuner);
  145.     }
  146.  
  147.     /* unmute audio */
  148.     audio.audio = 0;
  149.     ioctl(video_fd, VIDIOCGAUDIO, &audio);
  150.     memcpy(&s->audio_saved, &audio, sizeof(audio));
  151.     audio.flags &= ~VIDEO_AUDIO_MUTE;
  152.     ioctl(video_fd, VIDIOCSAUDIO, &audio);
  153.  
  154.     ioctl(video_fd, VIDIOCGPICT, &pict);
  155.     ff_dlog(s1, "v4l: colour=%d hue=%d brightness=%d constrast=%d whiteness=%d\n",
  156.             pict.colour, pict.hue, pict.brightness, pict.contrast, pict.whiteness);
  157.     /* try to choose a suitable video format */
  158.     pict.palette = desired_palette;
  159.     pict.depth= desired_depth;
  160.     if (desired_palette == -1 || ioctl(video_fd, VIDIOCSPICT, &pict) < 0) {
  161.         for (j = 0; j < vformat_num; j++) {
  162.             pict.palette = video_formats[j].palette;
  163.             pict.depth = video_formats[j].depth;
  164.             if (-1 != ioctl(video_fd, VIDIOCSPICT, &pict))
  165.                 break;
  166.         }
  167.         if (j >= vformat_num)
  168.             goto fail1;
  169.     }
  170.  
  171.     if (ioctl(video_fd, VIDIOCGMBUF, &s->gb_buffers) < 0) {
  172.         /* try to use read based access */
  173.         int val;
  174.  
  175.         s->video_win.x = 0;
  176.         s->video_win.y = 0;
  177.         s->video_win.chromakey = -1;
  178.         s->video_win.flags = 0;
  179.  
  180.         if (ioctl(video_fd, VIDIOCSWIN, s->video_win) < 0) {
  181.             av_log(s1, AV_LOG_ERROR, "VIDIOCSWIN: %s\n", strerror(errno));
  182.             goto fail;
  183.         }
  184.  
  185.         s->frame_format = pict.palette;
  186.  
  187.         val = 1;
  188.         if (ioctl(video_fd, VIDIOCCAPTURE, &val) < 0) {
  189.             av_log(s1, AV_LOG_ERROR, "VIDIOCCAPTURE: %s\n", strerror(errno));
  190.             goto fail;
  191.         }
  192.  
  193.         s->time_frame = av_gettime() * s->time_base.den / s->time_base.num;
  194.         s->use_mmap = 0;
  195.     } else {
  196.         s->video_buf = mmap(0, s->gb_buffers.size, PROT_READ|PROT_WRITE, MAP_SHARED, video_fd, 0);
  197.         if ((unsigned char*)-1 == s->video_buf) {
  198.             s->video_buf = mmap(0, s->gb_buffers.size, PROT_READ|PROT_WRITE, MAP_PRIVATE, video_fd, 0);
  199.             if ((unsigned char*)-1 == s->video_buf) {
  200.                 av_log(s1, AV_LOG_ERROR, "mmap: %s\n", strerror(errno));
  201.                 goto fail;
  202.             }
  203.         }
  204.         s->gb_frame = 0;
  205.         s->time_frame = av_gettime() * s->time_base.den / s->time_base.num;
  206.  
  207.         /* start to grab the first frame */
  208.         s->gb_buf.frame = s->gb_frame % s->gb_buffers.frames;
  209.         s->gb_buf.height = s->video_win.height;
  210.         s->gb_buf.width = s->video_win.width;
  211.         s->gb_buf.format = pict.palette;
  212.  
  213.         if (ioctl(video_fd, VIDIOCMCAPTURE, &s->gb_buf) < 0) {
  214.             if (errno != EAGAIN) {
  215.             fail1:
  216.                 av_log(s1, AV_LOG_ERROR, "VIDIOCMCAPTURE: %s\n", strerror(errno));
  217.             } else {
  218.                 av_log(s1, AV_LOG_ERROR, "Fatal: grab device does not receive any video signal\n");
  219.             }
  220.             goto fail;
  221.         }
  222.         for (j = 1; j < s->gb_buffers.frames; j++) {
  223.           s->gb_buf.frame = j;
  224.           ioctl(video_fd, VIDIOCMCAPTURE, &s->gb_buf);
  225.         }
  226.         s->frame_format = s->gb_buf.format;
  227.         s->use_mmap = 1;
  228.     }
  229.  
  230.     for (j = 0; j < vformat_num; j++) {
  231.         if (s->frame_format == video_formats[j].palette) {
  232.             s->frame_size = s->video_win.width * s->video_win.height * video_formats[j].depth / 8;
  233.             st->codec->pix_fmt = video_formats[j].pix_fmt;
  234.             break;
  235.         }
  236.     }
  237.  
  238.     if (j >= vformat_num)
  239.         goto fail;
  240.  
  241.     s->fd = video_fd;
  242.  
  243.     st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
  244.     st->codec->codec_id = AV_CODEC_ID_RAWVIDEO;
  245.     st->codec->width = s->video_win.width;
  246.     st->codec->height = s->video_win.height;
  247.     st->codec->time_base = s->time_base;
  248.     st->codec->bit_rate = s->frame_size * 1/av_q2d(st->codec->time_base) * 8;
  249.  
  250.     return 0;
  251.  fail:
  252.     if (video_fd >= 0)
  253.         close(video_fd);
  254.     return AVERROR(EIO);
  255. }
  256.  
  257. static int v4l_mm_read_picture(VideoData *s, uint8_t *buf)
  258. {
  259.     uint8_t *ptr;
  260.  
  261.     while (ioctl(s->fd, VIDIOCSYNC, &s->gb_frame) < 0 &&
  262.            (errno == EAGAIN || errno == EINTR));
  263.  
  264.     ptr = s->video_buf + s->gb_buffers.offsets[s->gb_frame];
  265.     memcpy(buf, ptr, s->frame_size);
  266.  
  267.     /* Setup to capture the next frame */
  268.     s->gb_buf.frame = s->gb_frame;
  269.     if (ioctl(s->fd, VIDIOCMCAPTURE, &s->gb_buf) < 0) {
  270.         if (errno == EAGAIN)
  271.             av_log(NULL, AV_LOG_ERROR, "Cannot Sync\n");
  272.         else
  273.             av_log(NULL, AV_LOG_ERROR, "VIDIOCMCAPTURE: %s\n", strerror(errno));
  274.         return AVERROR(EIO);
  275.     }
  276.  
  277.     /* This is now the grabbing frame */
  278.     s->gb_frame = (s->gb_frame + 1) % s->gb_buffers.frames;
  279.  
  280.     return s->frame_size;
  281. }
  282.  
  283. static int grab_read_packet(AVFormatContext *s1, AVPacket *pkt)
  284. {
  285.     VideoData *s = s1->priv_data;
  286.     int64_t curtime, delay;
  287.     struct timespec ts;
  288.  
  289.     /* Calculate the time of the next frame */
  290.     s->time_frame += INT64_C(1000000);
  291.  
  292.     /* wait based on the frame rate */
  293.     for(;;) {
  294.         curtime = av_gettime();
  295.         delay = s->time_frame * s->time_base.num / s->time_base.den - curtime;
  296.         if (delay <= 0) {
  297.             if (delay < INT64_C(-1000000) * s->time_base.num / s->time_base.den) {
  298.                 /* printf("grabbing is %d frames late (dropping)\n", (int) -(delay / 16666)); */
  299.                 s->time_frame += INT64_C(1000000);
  300.             }
  301.             break;
  302.         }
  303.         ts.tv_sec = delay / 1000000;
  304.         ts.tv_nsec = (delay % 1000000) * 1000;
  305.         nanosleep(&ts, NULL);
  306.     }
  307.  
  308.     if (av_new_packet(pkt, s->frame_size) < 0)
  309.         return AVERROR(EIO);
  310.  
  311.     pkt->pts = curtime;
  312.  
  313.     /* read one frame */
  314.     if (s->use_mmap) {
  315.         return v4l_mm_read_picture(s, pkt->data);
  316.     } else {
  317.         if (read(s->fd, pkt->data, pkt->size) != pkt->size)
  318.             return AVERROR(EIO);
  319.         return s->frame_size;
  320.     }
  321. }
  322.  
  323. static int grab_read_close(AVFormatContext *s1)
  324. {
  325.     VideoData *s = s1->priv_data;
  326.  
  327.     if (s->use_mmap)
  328.         munmap(s->video_buf, s->gb_buffers.size);
  329.  
  330.     /* mute audio. we must force it because the BTTV driver does not
  331.        return its state correctly */
  332.     s->audio_saved.flags |= VIDEO_AUDIO_MUTE;
  333.     ioctl(s->fd, VIDIOCSAUDIO, &s->audio_saved);
  334.  
  335.     close(s->fd);
  336.     return 0;
  337. }
  338.  
  339. static const AVOption options[] = {
  340.     { "standard", "", offsetof(VideoData, standard), AV_OPT_TYPE_INT, {.i64 = VIDEO_MODE_NTSC}, VIDEO_MODE_PAL, VIDEO_MODE_NTSC, AV_OPT_FLAG_DECODING_PARAM, "standard" },
  341.     { "PAL",   "", 0, AV_OPT_TYPE_CONST, {.i64 = VIDEO_MODE_PAL},   0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
  342.     { "SECAM", "", 0, AV_OPT_TYPE_CONST, {.i64 = VIDEO_MODE_SECAM}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
  343.     { "NTSC",  "", 0, AV_OPT_TYPE_CONST, {.i64 = VIDEO_MODE_NTSC},  0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
  344.     { NULL },
  345. };
  346.  
  347. static const AVClass v4l_class = {
  348.     .class_name = "V4L indev",
  349.     .item_name  = av_default_item_name,
  350.     .option     = options,
  351.     .version    = LIBAVUTIL_VERSION_INT,
  352.     .category   = AV_CLASS_CATEGORY_DEVICE_VIDEO_INPUT,
  353. };
  354.  
  355. AVInputFormat ff_v4l_demuxer = {
  356.     .name           = "video4linux,v4l",
  357.     .long_name      = NULL_IF_CONFIG_SMALL("Video4Linux device grab"),
  358.     .priv_data_size = sizeof(VideoData),
  359.     .read_header    = grab_read_header,
  360.     .read_packet    = grab_read_packet,
  361.     .read_close     = grab_read_close,
  362.     .flags          = AVFMT_NOFILE,
  363.     .priv_class     = &v4l_class,
  364. };
  365.