yading@10: /*
yading@10:  * Linux video grab interface
yading@10:  * Copyright (c) 2000,2001 Fabrice Bellard
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: #include "avdevice.h"
yading@10: 
yading@10: #undef __STRICT_ANSI__ //workaround due to broken kernel headers
yading@10: #include "config.h"
yading@10: #include "libavutil/rational.h"
yading@10: #include "libavutil/imgutils.h"
yading@10: #include "libavutil/log.h"
yading@10: #include "libavutil/opt.h"
yading@10: #include "libavformat/internal.h"
yading@10: #include "libavcodec/dsputil.h"
yading@10: #include <unistd.h>
yading@10: #include <fcntl.h>
yading@10: #include <sys/ioctl.h>
yading@10: #include <sys/mman.h>
yading@10: #include <sys/time.h>
yading@10: #define _LINUX_TIME_H 1
yading@10: #include <linux/videodev.h>
yading@10: #include <time.h>
yading@10: #include "avdevice.h"
yading@10: 
yading@10: typedef struct {
yading@10:     AVClass *class;
yading@10:     int fd;
yading@10:     int frame_format; /* see VIDEO_PALETTE_xxx */
yading@10:     int use_mmap;
yading@10:     AVRational time_base;
yading@10:     int64_t time_frame;
yading@10:     int frame_size;
yading@10:     struct video_capability video_cap;
yading@10:     struct video_audio audio_saved;
yading@10:     struct video_window video_win;
yading@10:     uint8_t *video_buf;
yading@10:     struct video_mbuf gb_buffers;
yading@10:     struct video_mmap gb_buf;
yading@10:     int gb_frame;
yading@10:     int standard;
yading@10: } VideoData;
yading@10: 
yading@10: static const struct {
yading@10:     int palette;
yading@10:     int depth;
yading@10:     enum AVPixelFormat pix_fmt;
yading@10: } video_formats [] = {
yading@10:     {.palette = VIDEO_PALETTE_YUV420P, .depth = 12, .pix_fmt = AV_PIX_FMT_YUV420P },
yading@10:     {.palette = VIDEO_PALETTE_YUV422,  .depth = 16, .pix_fmt = AV_PIX_FMT_YUYV422 },
yading@10:     {.palette = VIDEO_PALETTE_UYVY,    .depth = 16, .pix_fmt = AV_PIX_FMT_UYVY422 },
yading@10:     {.palette = VIDEO_PALETTE_YUYV,    .depth = 16, .pix_fmt = AV_PIX_FMT_YUYV422 },
yading@10:     /* NOTE: v4l uses BGR24, not RGB24 */
yading@10:     {.palette = VIDEO_PALETTE_RGB24,   .depth = 24, .pix_fmt = AV_PIX_FMT_BGR24   },
yading@10:     {.palette = VIDEO_PALETTE_RGB565,  .depth = 16, .pix_fmt = AV_PIX_FMT_BGR565  },
yading@10:     {.palette = VIDEO_PALETTE_GREY,    .depth = 8,  .pix_fmt = AV_PIX_FMT_GRAY8   },
yading@10: };
yading@10: 
yading@10: 
yading@10: static int grab_read_header(AVFormatContext *s1, AVFormatParameters *ap)
yading@10: {
yading@10:     VideoData *s = s1->priv_data;
yading@10:     AVStream *st;
yading@10:     int video_fd;
yading@10:     int desired_palette, desired_depth;
yading@10:     struct video_tuner tuner;
yading@10:     struct video_audio audio;
yading@10:     struct video_picture pict;
yading@10:     int j;
yading@10:     int vformat_num = FF_ARRAY_ELEMS(video_formats);
yading@10: 
yading@10:     av_log(s1, AV_LOG_WARNING, "V4L input device is deprecated and will be removed in the next release.");
yading@10: 
yading@10:     if (ap->time_base.den <= 0) {
yading@10:         av_log(s1, AV_LOG_ERROR, "Wrong time base (%d)\n", ap->time_base.den);
yading@10:         return -1;
yading@10:     }
yading@10:     s->time_base = ap->time_base;
yading@10: 
yading@10:     s->video_win.width = ap->width;
yading@10:     s->video_win.height = ap->height;
yading@10: 
yading@10:     st = avformat_new_stream(s1, NULL);
yading@10:     if (!st)
yading@10:         return AVERROR(ENOMEM);
yading@10:     avpriv_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in us */
yading@10: 
yading@10:     video_fd = open(s1->filename, O_RDWR);
yading@10:     if (video_fd < 0) {
yading@10:         av_log(s1, AV_LOG_ERROR, "%s: %s\n", s1->filename, strerror(errno));
yading@10:         goto fail;
yading@10:     }
yading@10: 
yading@10:     if (ioctl(video_fd, VIDIOCGCAP, &s->video_cap) < 0) {
yading@10:         av_log(s1, AV_LOG_ERROR, "VIDIOCGCAP: %s\n", strerror(errno));
yading@10:         goto fail;
yading@10:     }
yading@10: 
yading@10:     if (!(s->video_cap.type & VID_TYPE_CAPTURE)) {
yading@10:         av_log(s1, AV_LOG_ERROR, "Fatal: grab device does not handle capture\n");
yading@10:         goto fail;
yading@10:     }
yading@10: 
yading@10:     /* no values set, autodetect them */
yading@10:     if (s->video_win.width <= 0 || s->video_win.height <= 0) {
yading@10:         if (ioctl(video_fd, VIDIOCGWIN, &s->video_win, sizeof(s->video_win)) < 0) {
yading@10:             av_log(s1, AV_LOG_ERROR, "VIDIOCGWIN: %s\n", strerror(errno));
yading@10:             goto fail;
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     if(av_image_check_size(s->video_win.width, s->video_win.height, 0, s1) < 0)
yading@10:         return -1;
yading@10: 
yading@10:     desired_palette = -1;
yading@10:     desired_depth = -1;
yading@10:     for (j = 0; j < vformat_num; j++) {
yading@10:         if (ap->pix_fmt == video_formats[j].pix_fmt) {
yading@10:             desired_palette = video_formats[j].palette;
yading@10:             desired_depth = video_formats[j].depth;
yading@10:             break;
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     /* set tv standard */
yading@10:     if (!ioctl(video_fd, VIDIOCGTUNER, &tuner)) {
yading@10:         tuner.mode = s->standard;
yading@10:         ioctl(video_fd, VIDIOCSTUNER, &tuner);
yading@10:     }
yading@10: 
yading@10:     /* unmute audio */
yading@10:     audio.audio = 0;
yading@10:     ioctl(video_fd, VIDIOCGAUDIO, &audio);
yading@10:     memcpy(&s->audio_saved, &audio, sizeof(audio));
yading@10:     audio.flags &= ~VIDEO_AUDIO_MUTE;
yading@10:     ioctl(video_fd, VIDIOCSAUDIO, &audio);
yading@10: 
yading@10:     ioctl(video_fd, VIDIOCGPICT, &pict);
yading@10:     av_dlog(s1, "v4l: colour=%d hue=%d brightness=%d constrast=%d whiteness=%d\n",
yading@10:             pict.colour, pict.hue, pict.brightness, pict.contrast, pict.whiteness);
yading@10:     /* try to choose a suitable video format */
yading@10:     pict.palette = desired_palette;
yading@10:     pict.depth= desired_depth;
yading@10:     if (desired_palette == -1 || ioctl(video_fd, VIDIOCSPICT, &pict) < 0) {
yading@10:         for (j = 0; j < vformat_num; j++) {
yading@10:             pict.palette = video_formats[j].palette;
yading@10:             pict.depth = video_formats[j].depth;
yading@10:             if (-1 != ioctl(video_fd, VIDIOCSPICT, &pict))
yading@10:                 break;
yading@10:         }
yading@10:         if (j >= vformat_num)
yading@10:             goto fail1;
yading@10:     }
yading@10: 
yading@10:     if (ioctl(video_fd, VIDIOCGMBUF, &s->gb_buffers) < 0) {
yading@10:         /* try to use read based access */
yading@10:         int val;
yading@10: 
yading@10:         s->video_win.x = 0;
yading@10:         s->video_win.y = 0;
yading@10:         s->video_win.chromakey = -1;
yading@10:         s->video_win.flags = 0;
yading@10: 
yading@10:         if (ioctl(video_fd, VIDIOCSWIN, s->video_win) < 0) {
yading@10:             av_log(s1, AV_LOG_ERROR, "VIDIOCSWIN: %s\n", strerror(errno));
yading@10:             goto fail;
yading@10:         }
yading@10: 
yading@10:         s->frame_format = pict.palette;
yading@10: 
yading@10:         val = 1;
yading@10:         if (ioctl(video_fd, VIDIOCCAPTURE, &val) < 0) {
yading@10:             av_log(s1, AV_LOG_ERROR, "VIDIOCCAPTURE: %s\n", strerror(errno));
yading@10:             goto fail;
yading@10:         }
yading@10: 
yading@10:         s->time_frame = av_gettime() * s->time_base.den / s->time_base.num;
yading@10:         s->use_mmap = 0;
yading@10:     } else {
yading@10:         s->video_buf = mmap(0, s->gb_buffers.size, PROT_READ|PROT_WRITE, MAP_SHARED, video_fd, 0);
yading@10:         if ((unsigned char*)-1 == s->video_buf) {
yading@10:             s->video_buf = mmap(0, s->gb_buffers.size, PROT_READ|PROT_WRITE, MAP_PRIVATE, video_fd, 0);
yading@10:             if ((unsigned char*)-1 == s->video_buf) {
yading@10:                 av_log(s1, AV_LOG_ERROR, "mmap: %s\n", strerror(errno));
yading@10:                 goto fail;
yading@10:             }
yading@10:         }
yading@10:         s->gb_frame = 0;
yading@10:         s->time_frame = av_gettime() * s->time_base.den / s->time_base.num;
yading@10: 
yading@10:         /* start to grab the first frame */
yading@10:         s->gb_buf.frame = s->gb_frame % s->gb_buffers.frames;
yading@10:         s->gb_buf.height = s->video_win.height;
yading@10:         s->gb_buf.width = s->video_win.width;
yading@10:         s->gb_buf.format = pict.palette;
yading@10: 
yading@10:         if (ioctl(video_fd, VIDIOCMCAPTURE, &s->gb_buf) < 0) {
yading@10:             if (errno != EAGAIN) {
yading@10:             fail1:
yading@10:                 av_log(s1, AV_LOG_ERROR, "VIDIOCMCAPTURE: %s\n", strerror(errno));
yading@10:             } else {
yading@10:                 av_log(s1, AV_LOG_ERROR, "Fatal: grab device does not receive any video signal\n");
yading@10:             }
yading@10:             goto fail;
yading@10:         }
yading@10:         for (j = 1; j < s->gb_buffers.frames; j++) {
yading@10:           s->gb_buf.frame = j;
yading@10:           ioctl(video_fd, VIDIOCMCAPTURE, &s->gb_buf);
yading@10:         }
yading@10:         s->frame_format = s->gb_buf.format;
yading@10:         s->use_mmap = 1;
yading@10:     }
yading@10: 
yading@10:     for (j = 0; j < vformat_num; j++) {
yading@10:         if (s->frame_format == video_formats[j].palette) {
yading@10:             s->frame_size = s->video_win.width * s->video_win.height * video_formats[j].depth / 8;
yading@10:             st->codec->pix_fmt = video_formats[j].pix_fmt;
yading@10:             break;
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     if (j >= vformat_num)
yading@10:         goto fail;
yading@10: 
yading@10:     s->fd = video_fd;
yading@10: 
yading@10:     st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
yading@10:     st->codec->codec_id = AV_CODEC_ID_RAWVIDEO;
yading@10:     st->codec->width = s->video_win.width;
yading@10:     st->codec->height = s->video_win.height;
yading@10:     st->codec->time_base = s->time_base;
yading@10:     st->codec->bit_rate = s->frame_size * 1/av_q2d(st->codec->time_base) * 8;
yading@10: 
yading@10:     return 0;
yading@10:  fail:
yading@10:     if (video_fd >= 0)
yading@10:         close(video_fd);
yading@10:     return AVERROR(EIO);
yading@10: }
yading@10: 
yading@10: static int v4l_mm_read_picture(VideoData *s, uint8_t *buf)
yading@10: {
yading@10:     uint8_t *ptr;
yading@10: 
yading@10:     while (ioctl(s->fd, VIDIOCSYNC, &s->gb_frame) < 0 &&
yading@10:            (errno == EAGAIN || errno == EINTR));
yading@10: 
yading@10:     ptr = s->video_buf + s->gb_buffers.offsets[s->gb_frame];
yading@10:     memcpy(buf, ptr, s->frame_size);
yading@10: 
yading@10:     /* Setup to capture the next frame */
yading@10:     s->gb_buf.frame = s->gb_frame;
yading@10:     if (ioctl(s->fd, VIDIOCMCAPTURE, &s->gb_buf) < 0) {
yading@10:         if (errno == EAGAIN)
yading@10:             av_log(NULL, AV_LOG_ERROR, "Cannot Sync\n");
yading@10:         else
yading@10:             av_log(NULL, AV_LOG_ERROR, "VIDIOCMCAPTURE: %s\n", strerror(errno));
yading@10:         return AVERROR(EIO);
yading@10:     }
yading@10: 
yading@10:     /* This is now the grabbing frame */
yading@10:     s->gb_frame = (s->gb_frame + 1) % s->gb_buffers.frames;
yading@10: 
yading@10:     return s->frame_size;
yading@10: }
yading@10: 
yading@10: static int grab_read_packet(AVFormatContext *s1, AVPacket *pkt)
yading@10: {
yading@10:     VideoData *s = s1->priv_data;
yading@10:     int64_t curtime, delay;
yading@10:     struct timespec ts;
yading@10: 
yading@10:     /* Calculate the time of the next frame */
yading@10:     s->time_frame += INT64_C(1000000);
yading@10: 
yading@10:     /* wait based on the frame rate */
yading@10:     for(;;) {
yading@10:         curtime = av_gettime();
yading@10:         delay = s->time_frame * s->time_base.num / s->time_base.den - curtime;
yading@10:         if (delay <= 0) {
yading@10:             if (delay < INT64_C(-1000000) * s->time_base.num / s->time_base.den) {
yading@10:                 /* printf("grabbing is %d frames late (dropping)\n", (int) -(delay / 16666)); */
yading@10:                 s->time_frame += INT64_C(1000000);
yading@10:             }
yading@10:             break;
yading@10:         }
yading@10:         ts.tv_sec = delay / 1000000;
yading@10:         ts.tv_nsec = (delay % 1000000) * 1000;
yading@10:         nanosleep(&ts, NULL);
yading@10:     }
yading@10: 
yading@10:     if (av_new_packet(pkt, s->frame_size) < 0)
yading@10:         return AVERROR(EIO);
yading@10: 
yading@10:     pkt->pts = curtime;
yading@10: 
yading@10:     /* read one frame */
yading@10:     if (s->use_mmap) {
yading@10:         return v4l_mm_read_picture(s, pkt->data);
yading@10:     } else {
yading@10:         if (read(s->fd, pkt->data, pkt->size) != pkt->size)
yading@10:             return AVERROR(EIO);
yading@10:         return s->frame_size;
yading@10:     }
yading@10: }
yading@10: 
yading@10: static int grab_read_close(AVFormatContext *s1)
yading@10: {
yading@10:     VideoData *s = s1->priv_data;
yading@10: 
yading@10:     if (s->use_mmap)
yading@10:         munmap(s->video_buf, s->gb_buffers.size);
yading@10: 
yading@10:     /* mute audio. we must force it because the BTTV driver does not
yading@10:        return its state correctly */
yading@10:     s->audio_saved.flags |= VIDEO_AUDIO_MUTE;
yading@10:     ioctl(s->fd, VIDIOCSAUDIO, &s->audio_saved);
yading@10: 
yading@10:     close(s->fd);
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static const AVOption options[] = {
yading@10:     { "standard", "", offsetof(VideoData, standard), AV_OPT_TYPE_INT, {.i64 = VIDEO_MODE_NTSC}, VIDEO_MODE_PAL, VIDEO_MODE_NTSC, AV_OPT_FLAG_DECODING_PARAM, "standard" },
yading@10:     { "PAL",   "", 0, AV_OPT_TYPE_CONST, {.i64 = VIDEO_MODE_PAL},   0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
yading@10:     { "SECAM", "", 0, AV_OPT_TYPE_CONST, {.i64 = VIDEO_MODE_SECAM}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
yading@10:     { "NTSC",  "", 0, AV_OPT_TYPE_CONST, {.i64 = VIDEO_MODE_NTSC},  0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
yading@10:     { NULL },
yading@10: };
yading@10: 
yading@10: static const AVClass v4l_class = {
yading@10:     .class_name = "V4L indev",
yading@10:     .item_name  = av_default_item_name,
yading@10:     .option     = options,
yading@10:     .version    = LIBAVUTIL_VERSION_INT,
yading@10: };
yading@10: 
yading@10: AVInputFormat ff_v4l_demuxer = {
yading@10:     .name           = "video4linux,v4l",
yading@10:     .long_name      = NULL_IF_CONFIG_SMALL("Video4Linux device grab"),
yading@10:     .priv_data_size = sizeof(VideoData),
yading@10:     .read_header    = grab_read_header,
yading@10:     .read_packet    = grab_read_packet,
yading@10:     .read_close     = grab_read_close,
yading@10:     .flags          = AVFMT_NOFILE,
yading@10:     .priv_class     = &v4l_class,
yading@10: };