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framebuffer device demuxer

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This commit is contained in:
Stefano Sabatini 2011-03-07 18:54:52 +01:00 committed by Michael Niedermayer
parent f56c4850e7
commit 1a204f0760
7 changed files with 284 additions and 2 deletions
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1
Changelog
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@ -77,6 +77,7 @@ version <next>:
- Wing Commander IV movies decoder added
- movie source added
- Bink version 'b' audio and video decoder
- Linux framebuffer input device added
version 0.6:

2
configure vendored
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@ -1404,6 +1404,7 @@ alsa_indev_deps="alsa_asoundlib_h snd_pcm_htimestamp"
alsa_outdev_deps="alsa_asoundlib_h"
bktr_indev_deps_any="dev_bktr_ioctl_bt848_h machine_ioctl_bt848_h dev_video_bktr_ioctl_bt848_h dev_ic_bt8xx_h"
dv1394_indev_deps="dv1394 dv_demuxer"
fbdev_indev_deps="linux_fb_h"
jack_indev_deps="jack_jack_h"
libdc1394_indev_deps="libdc1394"
oss_indev_deps_any="soundcard_h sys_soundcard_h"
@ -2877,6 +2878,7 @@ fi
texi2html -version > /dev/null 2>&1 && enable texi2html || disable texi2html
check_header linux/fb.h
check_header linux/videodev.h
check_header linux/videodev2.h
check_header sys/videoio.h

25
doc/indevs.texi
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@ -59,6 +59,31 @@ BSD video input device.
Linux DV 1394 input device.
@section fbdev
Linux framebuffer input device.
The Linux framebuffer is a graphic hardware-independent abstraction
layer to show graphics on a computer monitor, typically on the
console. It is accessed through a file device node, usually
@file{/dev/fb0}.
For more detailed information read the file
Documentation/fb/framebuffer.txt included in the Linux source tree.
For example, to record from the framebuffer device @file{/dev/fb0} with
@file{ffmpeg}:
@example
ffmpeg -f fbdev -r 10 -i /dev/fb0 out.avi
@end example
You can take a single screenshot image with the command:
@example
ffmpeg -f fbdev -vframes 1 -r 1 -i /dev/fb0 screenshot.jpeg
@end example
See also @url{http://linux-fbdev.sourceforge.net/}, and fbset(1).
@section jack
JACK input device.

1
libavdevice/Makefile
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@ -14,6 +14,7 @@ OBJS-$(CONFIG_ALSA_OUTDEV) += alsa-audio-common.o \
alsa-audio-enc.o
OBJS-$(CONFIG_BKTR_INDEV) += bktr.o
OBJS-$(CONFIG_DV1394_INDEV) += dv1394.o
OBJS-$(CONFIG_FBDEV_INDEV) += fbdev.o
OBJS-$(CONFIG_JACK_INDEV) += jack_audio.o
OBJS-$(CONFIG_OSS_INDEV) += oss_audio.o
OBJS-$(CONFIG_OSS_OUTDEV) += oss_audio.o

1
libavdevice/alldevices.c
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@ -42,6 +42,7 @@ void avdevice_register_all(void)
REGISTER_INOUTDEV (ALSA, alsa);
REGISTER_INDEV (BKTR, bktr);
REGISTER_INDEV (DV1394, dv1394);
REGISTER_INDEV (FBDEV, fbdev);
REGISTER_INDEV (JACK, jack);
REGISTER_INOUTDEV (OSS, oss);
REGISTER_INDEV (V4L2, v4l2);

4
libavdevice/avdevice.h
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@ -22,8 +22,8 @@
#include "libavutil/avutil.h"
#define LIBAVDEVICE_VERSION_MAJOR 52
#define LIBAVDEVICE_VERSION_MINOR 2
#define LIBAVDEVICE_VERSION_MICRO 3
#define LIBAVDEVICE_VERSION_MINOR 3
#define LIBAVDEVICE_VERSION_MICRO 0
#define LIBAVDEVICE_VERSION_INT AV_VERSION_INT(LIBAVDEVICE_VERSION_MAJOR, \
LIBAVDEVICE_VERSION_MINOR, \

252
libavdevice/fbdev.c Normal file
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@ -0,0 +1,252 @@
/*
* 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/mem.h"
#include "libavutil/pixdesc.h"
#include "libavformat/avformat.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 {
int frame_size; ///< size in bytes of a grabbed frame
AVRational time_base; ///< time base
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;
if (!(st = av_new_stream(avctx, 0)))
return AVERROR(ENOMEM);
av_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in microseconds */
if (ap->time_base.den <= 0) {
av_log(avctx, AV_LOG_ERROR, "Invalid time base %d/%d\n",
ap->time_base.num, ap->time_base.den);
return AVERROR(EINVAL);
}
/* 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_base = ap->time_base;
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 = ap->time_base;
st->codec->bit_rate =
fbdev->width * fbdev->heigth * fbdev->bytes_per_pixel / av_q2d(ap->time_base) * 8;
av_log(avctx, AV_LOG_INFO,
"w:%d h:%d bpp:%d pixfmt:%s tb:%d/%d bit_rate:%d\n",
fbdev->width, fbdev->heigth, fbdev->varinfo.bits_per_pixel,
av_pix_fmt_descriptors[pix_fmt].name,
ap->time_base.num, ap->time_base.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->time_base);
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) == 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;
}
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,
};