0,0 → 1,231 |
/* |
* 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; |
} |
|
#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, |
}; |
|
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, |
}; |