/* * Copyright (c) 2013 Lukasz Marek * * 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 */ #include <unistd.h> #include <fcntl.h> #include <sys/ioctl.h> #include <sys/mman.h> #include <linux/fb.h> #include "libavutil/pixdesc.h" #include "libavutil/log.h" #include "libavutil/mem.h" #include "libavutil/opt.h" #include "libavformat/avformat.h" #include "fbdev_common.h" typedef struct { AVClass *class; ///< class for private options int xoffset; ///< x coordinate of top left corner int yoffset; ///< y coordinate of top left corner struct fb_var_screeninfo varinfo; ///< framebuffer variable info struct fb_fix_screeninfo fixinfo; ///< framebuffer fixed info int fd; ///< framebuffer device file descriptor uint8_t *data; ///< framebuffer data } FBDevContext; static av_cold int fbdev_write_header(AVFormatContext *h) { FBDevContext *fbdev = h->priv_data; enum AVPixelFormat pix_fmt; int ret, flags = O_RDWR; const char* device; if (h->nb_streams != 1 || h->streams[0]->codec->codec_type != AVMEDIA_TYPE_VIDEO) { av_log(fbdev, AV_LOG_ERROR, "Only a single video stream is supported.\n"); return AVERROR(EINVAL); } if (h->filename[0]) device = h->filename; else device = ff_fbdev_default_device(); if ((fbdev->fd = avpriv_open(device, flags)) == -1) { ret = AVERROR(errno); av_log(h, AV_LOG_ERROR, "Could not open framebuffer device '%s': %s\n", device, av_err2str(ret)); return ret; } if (ioctl(fbdev->fd, FBIOGET_VSCREENINFO, &fbdev->varinfo) < 0) { ret = AVERROR(errno); av_log(h, 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(h, 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(h, AV_LOG_ERROR, "Framebuffer pixel format not supported.\n"); goto fail; } fbdev->data = mmap(NULL, fbdev->fixinfo.smem_len, PROT_WRITE, MAP_SHARED, fbdev->fd, 0); if (fbdev->data == MAP_FAILED) { ret = AVERROR(errno); av_log(h, AV_LOG_ERROR, "Error in mmap(): %s\n", av_err2str(ret)); goto fail; } return 0; fail: close(fbdev->fd); return ret; } static int fbdev_write_packet(AVFormatContext *h, AVPacket *pkt) { FBDevContext *fbdev = h->priv_data; uint8_t *pin, *pout; enum AVPixelFormat fb_pix_fmt; int disp_height; int bytes_to_copy; AVCodecContext *codec_ctx = h->streams[0]->codec; enum AVPixelFormat video_pix_fmt = codec_ctx->pix_fmt; int video_width = codec_ctx->width; int video_height = codec_ctx->height; int bytes_per_pixel = ((codec_ctx->bits_per_coded_sample + 7) >> 3); int src_line_size = video_width * bytes_per_pixel; int i; if (ioctl(fbdev->fd, FBIOGET_VSCREENINFO, &fbdev->varinfo) < 0) av_log(h, AV_LOG_WARNING, "Error refreshing variable info: %s\n", av_err2str(AVERROR(errno))); fb_pix_fmt = ff_get_pixfmt_from_fb_varinfo(&fbdev->varinfo); if (fb_pix_fmt != video_pix_fmt) { av_log(h, AV_LOG_ERROR, "Pixel format %s is not supported, use %s\n", av_get_pix_fmt_name(video_pix_fmt), av_get_pix_fmt_name(fb_pix_fmt)); return AVERROR(EINVAL); } disp_height = FFMIN(fbdev->varinfo.yres, video_height); bytes_to_copy = FFMIN(fbdev->varinfo.xres, video_width) * bytes_per_pixel; pin = pkt->data; pout = fbdev->data + bytes_per_pixel * fbdev->varinfo.xoffset + fbdev->varinfo.yoffset * fbdev->fixinfo.line_length; if (fbdev->xoffset) { if (fbdev->xoffset < 0) { if (-fbdev->xoffset >= video_width) //nothing to display return 0; bytes_to_copy += fbdev->xoffset * bytes_per_pixel; pin -= fbdev->xoffset * bytes_per_pixel; } else { int diff = (video_width + fbdev->xoffset) - fbdev->varinfo.xres; if (diff > 0) { if (diff >= video_width) //nothing to display return 0; bytes_to_copy -= diff * bytes_per_pixel; } pout += bytes_per_pixel * fbdev->xoffset; } } if (fbdev->yoffset) { if (fbdev->yoffset < 0) { if (-fbdev->yoffset >= video_height) //nothing to display return 0; disp_height += fbdev->yoffset; pin -= fbdev->yoffset * src_line_size; } else { int diff = (video_height + fbdev->yoffset) - fbdev->varinfo.yres; if (diff > 0) { if (diff >= video_height) //nothing to display return 0; disp_height -= diff; } pout += fbdev->yoffset * fbdev->fixinfo.line_length; } } for (i = 0; i < disp_height; i++) { memcpy(pout, pin, bytes_to_copy); pout += fbdev->fixinfo.line_length; pin += src_line_size; } return 0; } static av_cold int fbdev_write_trailer(AVFormatContext *h) { FBDevContext *fbdev = h->priv_data; munmap(fbdev->data, fbdev->fixinfo.smem_len); close(fbdev->fd); return 0; } #define OFFSET(x) offsetof(FBDevContext, x) #define ENC AV_OPT_FLAG_ENCODING_PARAM static const AVOption options[] = { { "xoffset", "set x coordinate of top left corner", OFFSET(xoffset), AV_OPT_TYPE_INT, {.i64 = 0}, INT_MIN, INT_MAX, ENC }, { "yoffset", "set y coordinate of top left corner", OFFSET(yoffset), AV_OPT_TYPE_INT, {.i64 = 0}, INT_MIN, INT_MAX, ENC }, { NULL } }; static const AVClass fbdev_class = { .class_name = "fbdev outdev", .item_name = av_default_item_name, .option = options, .version = LIBAVUTIL_VERSION_INT, }; AVOutputFormat ff_fbdev_muxer = { .name = "fbdev", .long_name = NULL_IF_CONFIG_SMALL("Linux framebuffer"), .priv_data_size = sizeof(FBDevContext), .audio_codec = AV_CODEC_ID_NONE, .video_codec = AV_CODEC_ID_RAWVIDEO, .write_header = fbdev_write_header, .write_packet = fbdev_write_packet, .write_trailer = fbdev_write_trailer, .flags = AVFMT_NOFILE | AVFMT_VARIABLE_FPS | AVFMT_NOTIMESTAMPS, .priv_class = &fbdev_class, };