| /* |
| * 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 also http://linux-fbdev.sourceforge.net/. |
| */ |
| |
| /* #define DEBUG */ |
| |
| #include <unistd.h> |
| #include <fcntl.h> |
| #include <sys/ioctl.h> |
| #include <sys/time.h> |
| #include <sys/mman.h> |
| #include <time.h> |
| #include <linux/fb.h> |
| |
| #include "libavutil/log.h" |
| #include "libavutil/mem.h" |
| #include "libavutil/opt.h" |
| #include "libavutil/parseutils.h" |
| #include "libavutil/pixdesc.h" |
| #include "avdevice.h" |
| |
| struct rgb_pixfmt_map_entry { |
| int bits_per_pixel; |
| int red_offset, green_offset, blue_offset, alpha_offset; |
| enum PixelFormat pixfmt; |
| }; |
| |
| static struct rgb_pixfmt_map_entry rgb_pixfmt_map[] = { |
| // bpp, red_offset, green_offset, blue_offset, alpha_offset, pixfmt |
| { 32, 0, 8, 16, 24, PIX_FMT_RGBA }, |
| { 32, 16, 8, 0, 24, PIX_FMT_BGRA }, |
| { 32, 8, 16, 24, 0, PIX_FMT_ARGB }, |
| { 32, 3, 2, 8, 0, PIX_FMT_ABGR }, |
| { 24, 0, 8, 16, 0, PIX_FMT_RGB24 }, |
| { 24, 16, 8, 0, 0, PIX_FMT_BGR24 }, |
| }; |
| |
| static enum PixelFormat get_pixfmt_from_fb_varinfo(struct fb_var_screeninfo *varinfo) |
| { |
| int i; |
| |
| for (i = 0; i < FF_ARRAY_ELEMS(rgb_pixfmt_map); i++) { |
| struct rgb_pixfmt_map_entry *entry = &rgb_pixfmt_map[i]; |
| if (entry->bits_per_pixel == varinfo->bits_per_pixel && |
| entry->red_offset == varinfo->red.offset && |
| entry->green_offset == varinfo->green.offset && |
| entry->blue_offset == varinfo->blue.offset) |
| return entry->pixfmt; |
| } |
| |
| return PIX_FMT_NONE; |
| } |
| |
| typedef struct { |
| AVClass *class; ///< class for private options |
| int frame_size; ///< size in bytes of a grabbed frame |
| AVRational fps; ///< framerate |
| char *framerate; ///< framerate string set by a private option |
| int64_t time_frame; ///< time for the next frame to output (in 1/1000000 units) |
| |
| int fd; ///< framebuffer device file descriptor |
| int width, heigth; ///< 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; |
| |
| av_cold static int fbdev_read_header(AVFormatContext *avctx, |
| AVFormatParameters *ap) |
| { |
| FBDevContext *fbdev = avctx->priv_data; |
| AVStream *st = NULL; |
| enum PixelFormat pix_fmt; |
| int ret, flags = O_RDONLY; |
| |
| ret = av_parse_video_rate(&fbdev->fps, fbdev->framerate); |
| if (ret < 0) { |
| av_log(avctx, AV_LOG_ERROR, "Couldn't parse framerate.\n"); |
| return ret; |
| } |
| #if FF_API_FORMAT_PARAMETERS |
| if (ap->time_base.num) |
| fbdev->fps = (AVRational){ap->time_base.den, ap->time_base.num}; |
| #endif |
| |
| if (!(st = av_new_stream(avctx, 0))) |
| return AVERROR(ENOMEM); |
| av_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 = open(avctx->filename, flags)) == -1) { |
| ret = AVERROR(errno); |
| av_log(avctx, AV_LOG_ERROR, |
| "Could not open framebuffer device '%s': %s\n", |
| avctx->filename, strerror(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", strerror(errno)); |
| goto fail; |
| } |
| |
| if (ioctl(fbdev->fd, FBIOGET_FSCREENINFO, &fbdev->fixinfo) < 0) { |
| ret = AVERROR(errno); |
| av_log(avctx, AV_LOG_ERROR, |
| "FBIOGET_FSCREENINFO: %s\n", strerror(errno)); |
| goto fail; |
| } |
| |
| pix_fmt = get_pixfmt_from_fb_varinfo(&fbdev->varinfo); |
| if (pix_fmt == 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->heigth = 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->heigth; |
| 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", strerror(errno)); |
| goto fail; |
| } |
| |
| st->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
| st->codec->codec_id = CODEC_ID_RAWVIDEO; |
| st->codec->width = fbdev->width; |
| st->codec->height = fbdev->heigth; |
| st->codec->pix_fmt = pix_fmt; |
| st->codec->time_base = (AVRational){fbdev->fps.den, fbdev->fps.num}; |
| st->codec->bit_rate = |
| fbdev->width * fbdev->heigth * fbdev->bytes_per_pixel * av_q2d(fbdev->fps) * 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->heigth, fbdev->varinfo.bits_per_pixel, |
| av_pix_fmt_descriptors[pix_fmt].name, |
| fbdev->fps.num, fbdev->fps.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->fps); |
| 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", strerror(errno)); |
| |
| 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->heigth; i++) { |
| memcpy(pout, pin, fbdev->frame_linesize); |
| pin += fbdev->fixinfo.line_length; |
| pout += fbdev->frame_linesize; |
| } |
| |
| return fbdev->frame_size; |
| } |
| |
| av_cold static int fbdev_read_close(AVFormatContext *avctx) |
| { |
| FBDevContext *fbdev = avctx->priv_data; |
| |
| munmap(fbdev->data, fbdev->frame_size); |
| close(fbdev->fd); |
| |
| return 0; |
| } |
| |
| #define OFFSET(x) offsetof(FBDevContext, x) |
| #define DEC AV_OPT_FLAG_DECODING_PARAM |
| static const AVOption options[] = { |
| { "framerate","", OFFSET(framerate), FF_OPT_TYPE_STRING, {.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, |
| }; |
| |
| 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, |
| .flags = AVFMT_NOFILE, |
| .priv_class = &fbdev_class, |
| }; |