/* * Copyright (c) 2011 Stefano Sabatini * Copyright (c) 2009 Giliard B. de Freitas <giliarde@gmail.com> * Copyright (C) 2002 Gunnar Monell <gmo@linux.nu> * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /** * @file * Linux framebuffer input device, * inspired by code from fbgrab.c by Gunnar Monell. * @see http://linux-fbdev.sourceforge.net/ */ #include <unistd.h> #include <fcntl.h> #include <sys/ioctl.h> #include <sys/mman.h> #include <time.h> #include <linux/fb.h> #include "libavutil/internal.h" #include "libavutil/log.h" #include "libavutil/mem.h" #include "libavutil/opt.h" #include "libavutil/time.h" #include "libavutil/parseutils.h" #include "libavutil/pixdesc.h" #include "libavformat/internal.h" #include "avdevice.h" #include "fbdev_common.h" typedef struct { AVClass *class; ///< class for private options int frame_size; ///< size in bytes of a grabbed frame AVRational framerate_q; ///< framerate int64_t time_frame; ///< time for the next frame to output (in 1/1000000 units) int fd; ///< framebuffer device file descriptor int width, height; ///< assumed frame resolution int frame_linesize; ///< linesize of the output frame, it is assumed to be constant int bytes_per_pixel; struct fb_var_screeninfo varinfo; ///< variable info; struct fb_fix_screeninfo fixinfo; ///< fixed info; uint8_t *data; ///< framebuffer data } FBDevContext; static av_cold int fbdev_read_header(AVFormatContext *avctx) { FBDevContext *fbdev = avctx->priv_data; AVStream *st = NULL; enum AVPixelFormat pix_fmt; int ret, flags = O_RDONLY; if (!(st = avformat_new_stream(avctx, NULL))) return AVERROR(ENOMEM); avpriv_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in microseconds */ /* NONBLOCK is ignored by the fbdev driver, only set for consistency */ if (avctx->flags & AVFMT_FLAG_NONBLOCK) flags |= O_NONBLOCK; if ((fbdev->fd = avpriv_open(avctx->filename, flags)) == -1) { ret = AVERROR(errno); av_log(avctx, AV_LOG_ERROR, "Could not open framebuffer device '%s': %s\n", avctx->filename, av_err2str(ret)); return ret; } if (ioctl(fbdev->fd, FBIOGET_VSCREENINFO, &fbdev->varinfo) < 0) { ret = AVERROR(errno); av_log(avctx, AV_LOG_ERROR, "FBIOGET_VSCREENINFO: %s\n", av_err2str(ret)); goto fail; } if (ioctl(fbdev->fd, FBIOGET_FSCREENINFO, &fbdev->fixinfo) < 0) { ret = AVERROR(errno); av_log(avctx, AV_LOG_ERROR, "FBIOGET_FSCREENINFO: %s\n", av_err2str(ret)); goto fail; } pix_fmt = ff_get_pixfmt_from_fb_varinfo(&fbdev->varinfo); if (pix_fmt == AV_PIX_FMT_NONE) { ret = AVERROR(EINVAL); av_log(avctx, AV_LOG_ERROR, "Framebuffer pixel format not supported.\n"); goto fail; } fbdev->width = fbdev->varinfo.xres; fbdev->height = fbdev->varinfo.yres; fbdev->bytes_per_pixel = (fbdev->varinfo.bits_per_pixel + 7) >> 3; fbdev->frame_linesize = fbdev->width * fbdev->bytes_per_pixel; fbdev->frame_size = fbdev->frame_linesize * fbdev->height; fbdev->time_frame = AV_NOPTS_VALUE; fbdev->data = mmap(NULL, fbdev->fixinfo.smem_len, PROT_READ, MAP_SHARED, fbdev->fd, 0); if (fbdev->data == MAP_FAILED) { ret = AVERROR(errno); av_log(avctx, AV_LOG_ERROR, "Error in mmap(): %s\n", av_err2str(ret)); goto fail; } st->codec->codec_type = AVMEDIA_TYPE_VIDEO; st->codec->codec_id = AV_CODEC_ID_RAWVIDEO; st->codec->width = fbdev->width; st->codec->height = fbdev->height; st->codec->pix_fmt = pix_fmt; st->codec->time_base = av_inv_q(fbdev->framerate_q); st->codec->bit_rate = fbdev->width * fbdev->height * fbdev->bytes_per_pixel * av_q2d(fbdev->framerate_q) * 8; av_log(avctx, AV_LOG_INFO, "w:%d h:%d bpp:%d pixfmt:%s fps:%d/%d bit_rate:%d\n", fbdev->width, fbdev->height, fbdev->varinfo.bits_per_pixel, av_get_pix_fmt_name(pix_fmt), fbdev->framerate_q.num, fbdev->framerate_q.den, st->codec->bit_rate); return 0; fail: close(fbdev->fd); return ret; } static int fbdev_read_packet(AVFormatContext *avctx, AVPacket *pkt) { FBDevContext *fbdev = avctx->priv_data; int64_t curtime, delay; struct timespec ts; int i, ret; uint8_t *pin, *pout; if (fbdev->time_frame == AV_NOPTS_VALUE) fbdev->time_frame = av_gettime(); /* wait based on the frame rate */ while (1) { curtime = av_gettime(); delay = fbdev->time_frame - curtime; av_dlog(avctx, "time_frame:%"PRId64" curtime:%"PRId64" delay:%"PRId64"\n", fbdev->time_frame, curtime, delay); if (delay <= 0) { fbdev->time_frame += INT64_C(1000000) / av_q2d(fbdev->framerate_q); break; } if (avctx->flags & AVFMT_FLAG_NONBLOCK) return AVERROR(EAGAIN); ts.tv_sec = delay / 1000000; ts.tv_nsec = (delay % 1000000) * 1000; while (nanosleep(&ts, &ts) < 0 && errno == EINTR); } if ((ret = av_new_packet(pkt, fbdev->frame_size)) < 0) return ret; /* refresh fbdev->varinfo, visible data position may change at each call */ if (ioctl(fbdev->fd, FBIOGET_VSCREENINFO, &fbdev->varinfo) < 0) av_log(avctx, AV_LOG_WARNING, "Error refreshing variable info: %s\n", av_err2str(ret)); pkt->pts = curtime; /* compute visible data offset */ pin = fbdev->data + fbdev->bytes_per_pixel * fbdev->varinfo.xoffset + fbdev->varinfo.yoffset * fbdev->fixinfo.line_length; pout = pkt->data; for (i = 0; i < fbdev->height; i++) { memcpy(pout, pin, fbdev->frame_linesize); pin += fbdev->fixinfo.line_length; pout += fbdev->frame_linesize; } return fbdev->frame_size; } static av_cold int fbdev_read_close(AVFormatContext *avctx) { FBDevContext *fbdev = avctx->priv_data; munmap(fbdev->data, fbdev->fixinfo.smem_len); close(fbdev->fd); return 0; } static int fbdev_get_device_list(AVFormatContext *s, AVDeviceInfoList *device_list) { return ff_fbdev_get_device_list(device_list); } #define OFFSET(x) offsetof(FBDevContext, x) #define DEC AV_OPT_FLAG_DECODING_PARAM static const AVOption options[] = { { "framerate","", OFFSET(framerate_q), AV_OPT_TYPE_VIDEO_RATE, {.str = "25"}, 0, 0, DEC }, { NULL }, }; static const AVClass fbdev_class = { .class_name = "fbdev indev", .item_name = av_default_item_name, .option = options, .version = LIBAVUTIL_VERSION_INT, .category = AV_CLASS_CATEGORY_DEVICE_VIDEO_INPUT, }; AVInputFormat ff_fbdev_demuxer = { .name = "fbdev", .long_name = NULL_IF_CONFIG_SMALL("Linux framebuffer"), .priv_data_size = sizeof(FBDevContext), .read_header = fbdev_read_header, .read_packet = fbdev_read_packet, .read_close = fbdev_read_close, .get_device_list = fbdev_get_device_list, .flags = AVFMT_NOFILE, .priv_class = &fbdev_class, };