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