mirror of https://git.ffmpeg.org/ffmpeg.git
247 lines
8.1 KiB
C
247 lines
8.1 KiB
C
/*
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* Copyright (c) 2011 Stefano Sabatini
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* Copyright (c) 2009 Giliard B. de Freitas <giliarde@gmail.com>
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* Copyright (C) 2002 Gunnar Monell <gmo@linux.nu>
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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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/**
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* @file
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* Linux framebuffer input device,
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* inspired by code from fbgrab.c by Gunnar Monell.
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* @see http://linux-fbdev.sourceforge.net/
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*/
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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 <time.h>
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#include <linux/fb.h>
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#include "libavutil/file_open.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 "libavutil/time.h"
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#include "libavutil/parseutils.h"
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#include "libavutil/pixdesc.h"
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#include "libavformat/demux.h"
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#include "libavformat/internal.h"
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#include "avdevice.h"
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#include "fbdev_common.h"
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typedef struct FBDevContext {
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AVClass *class; ///< class for private options
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int frame_size; ///< size in bytes of a grabbed frame
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AVRational framerate_q; ///< framerate
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int64_t time_frame; ///< time for the next frame to output (in 1/1000000 units)
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int fd; ///< framebuffer device file descriptor
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int width, height; ///< assumed frame resolution
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int frame_linesize; ///< linesize of the output frame, it is assumed to be constant
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int bytes_per_pixel;
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struct fb_var_screeninfo varinfo; ///< variable info;
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struct fb_fix_screeninfo fixinfo; ///< fixed info;
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uint8_t *data; ///< framebuffer data
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} FBDevContext;
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static av_cold int fbdev_read_header(AVFormatContext *avctx)
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{
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FBDevContext *fbdev = avctx->priv_data;
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AVStream *st = NULL;
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enum AVPixelFormat pix_fmt;
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int ret, flags = O_RDONLY;
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const char* device;
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if (!(st = avformat_new_stream(avctx, NULL)))
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return AVERROR(ENOMEM);
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avpriv_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in microseconds */
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/* NONBLOCK is ignored by the fbdev driver, only set for consistency */
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if (avctx->flags & AVFMT_FLAG_NONBLOCK)
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flags |= O_NONBLOCK;
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if (avctx->url[0])
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device = avctx->url;
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else
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device = ff_fbdev_default_device();
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if ((fbdev->fd = avpriv_open(device, flags)) == -1) {
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ret = AVERROR(errno);
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av_log(avctx, AV_LOG_ERROR,
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"Could not open framebuffer device '%s': %s\n",
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device, av_err2str(ret));
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return ret;
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}
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if (ioctl(fbdev->fd, FBIOGET_VSCREENINFO, &fbdev->varinfo) < 0) {
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ret = AVERROR(errno);
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av_log(avctx, AV_LOG_ERROR,
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"FBIOGET_VSCREENINFO: %s\n", av_err2str(ret));
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goto fail;
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}
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if (ioctl(fbdev->fd, FBIOGET_FSCREENINFO, &fbdev->fixinfo) < 0) {
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ret = AVERROR(errno);
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av_log(avctx, AV_LOG_ERROR,
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"FBIOGET_FSCREENINFO: %s\n", av_err2str(ret));
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goto fail;
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}
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pix_fmt = ff_get_pixfmt_from_fb_varinfo(&fbdev->varinfo);
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if (pix_fmt == AV_PIX_FMT_NONE) {
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ret = AVERROR(EINVAL);
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av_log(avctx, AV_LOG_ERROR,
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"Framebuffer pixel format not supported.\n");
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goto fail;
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}
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fbdev->width = fbdev->varinfo.xres;
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fbdev->height = fbdev->varinfo.yres;
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fbdev->bytes_per_pixel = (fbdev->varinfo.bits_per_pixel + 7) >> 3;
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fbdev->frame_linesize = fbdev->width * fbdev->bytes_per_pixel;
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fbdev->frame_size = fbdev->frame_linesize * fbdev->height;
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fbdev->time_frame = AV_NOPTS_VALUE;
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fbdev->data = mmap(NULL, fbdev->fixinfo.smem_len, PROT_READ, MAP_SHARED, fbdev->fd, 0);
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if (fbdev->data == MAP_FAILED) {
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ret = AVERROR(errno);
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av_log(avctx, AV_LOG_ERROR, "Error in mmap(): %s\n", av_err2str(ret));
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goto fail;
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}
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st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
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st->codecpar->codec_id = AV_CODEC_ID_RAWVIDEO;
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st->codecpar->width = fbdev->width;
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st->codecpar->height = fbdev->height;
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st->codecpar->format = pix_fmt;
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st->avg_frame_rate = fbdev->framerate_q;
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st->codecpar->bit_rate =
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fbdev->width * fbdev->height * fbdev->bytes_per_pixel * av_q2d(fbdev->framerate_q) * 8;
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av_log(avctx, AV_LOG_INFO,
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"w:%d h:%d bpp:%d pixfmt:%s fps:%d/%d bit_rate:%"PRId64"\n",
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fbdev->width, fbdev->height, fbdev->varinfo.bits_per_pixel,
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av_get_pix_fmt_name(pix_fmt),
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fbdev->framerate_q.num, fbdev->framerate_q.den,
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st->codecpar->bit_rate);
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return 0;
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fail:
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close(fbdev->fd);
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return ret;
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}
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static int fbdev_read_packet(AVFormatContext *avctx, AVPacket *pkt)
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{
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FBDevContext *fbdev = avctx->priv_data;
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int64_t curtime, delay;
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struct timespec ts;
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int i, ret;
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uint8_t *pin, *pout;
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if (fbdev->time_frame == AV_NOPTS_VALUE)
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fbdev->time_frame = av_gettime_relative();
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/* wait based on the frame rate */
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while (1) {
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curtime = av_gettime_relative();
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delay = fbdev->time_frame - curtime;
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av_log(avctx, AV_LOG_TRACE,
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"time_frame:%"PRId64" curtime:%"PRId64" delay:%"PRId64"\n",
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fbdev->time_frame, curtime, delay);
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if (delay <= 0) {
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fbdev->time_frame += INT64_C(1000000) / av_q2d(fbdev->framerate_q);
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break;
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}
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if (avctx->flags & AVFMT_FLAG_NONBLOCK)
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return AVERROR(EAGAIN);
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ts.tv_sec = delay / 1000000;
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ts.tv_nsec = (delay % 1000000) * 1000;
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while (nanosleep(&ts, &ts) < 0 && errno == EINTR);
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}
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if ((ret = av_new_packet(pkt, fbdev->frame_size)) < 0)
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return ret;
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/* refresh fbdev->varinfo, visible data position may change at each call */
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if (ioctl(fbdev->fd, FBIOGET_VSCREENINFO, &fbdev->varinfo) < 0) {
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av_log(avctx, AV_LOG_WARNING,
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"Error refreshing variable info: %s\n", av_err2str(AVERROR(errno)));
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}
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pkt->pts = av_gettime();
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/* compute visible data offset */
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pin = fbdev->data + fbdev->bytes_per_pixel * fbdev->varinfo.xoffset +
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fbdev->varinfo.yoffset * fbdev->fixinfo.line_length;
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pout = pkt->data;
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for (i = 0; i < fbdev->height; i++) {
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memcpy(pout, pin, fbdev->frame_linesize);
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pin += fbdev->fixinfo.line_length;
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pout += fbdev->frame_linesize;
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}
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return fbdev->frame_size;
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}
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static av_cold int fbdev_read_close(AVFormatContext *avctx)
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{
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FBDevContext *fbdev = avctx->priv_data;
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munmap(fbdev->data, fbdev->fixinfo.smem_len);
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close(fbdev->fd);
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return 0;
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}
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static int fbdev_get_device_list(AVFormatContext *s, AVDeviceInfoList *device_list)
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{
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return ff_fbdev_get_device_list(device_list);
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}
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#define OFFSET(x) offsetof(FBDevContext, x)
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#define DEC AV_OPT_FLAG_DECODING_PARAM
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static const AVOption options[] = {
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{ "framerate","", OFFSET(framerate_q), AV_OPT_TYPE_VIDEO_RATE, {.str = "25"}, 0, INT_MAX, DEC },
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{ NULL },
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};
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static const AVClass fbdev_class = {
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.class_name = "fbdev 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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const FFInputFormat ff_fbdev_demuxer = {
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.p.name = "fbdev",
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.p.long_name = NULL_IF_CONFIG_SMALL("Linux framebuffer"),
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.p.flags = AVFMT_NOFILE,
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.p.priv_class = &fbdev_class,
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.priv_data_size = sizeof(FBDevContext),
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.read_header = fbdev_read_header,
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.read_packet = fbdev_read_packet,
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.read_close = fbdev_read_close,
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.get_device_list = fbdev_get_device_list,
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};
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