246 lines
8.0 KiB
C
246 lines
8.0 KiB
C
/*
|
|
* 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 FBDevContext {
|
|
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;
|
|
const char* device;
|
|
|
|
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 (avctx->url[0])
|
|
device = avctx->url;
|
|
else
|
|
device = ff_fbdev_default_device();
|
|
|
|
if ((fbdev->fd = avpriv_open(device, flags)) == -1) {
|
|
ret = AVERROR(errno);
|
|
av_log(avctx, 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(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->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
|
|
st->codecpar->codec_id = AV_CODEC_ID_RAWVIDEO;
|
|
st->codecpar->width = fbdev->width;
|
|
st->codecpar->height = fbdev->height;
|
|
st->codecpar->format = pix_fmt;
|
|
st->avg_frame_rate = fbdev->framerate_q;
|
|
st->codecpar->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:%"PRId64"\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->codecpar->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_log(avctx, AV_LOG_TRACE,
|
|
"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(AVERROR(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->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, INT_MAX, 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,
|
|
};
|