This source file includes following definitions.
- fbdev_read_header
- fbdev_read_packet
- fbdev_read_close
- fbdev_get_device_list
#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;
int frame_size;
AVRational framerate_q;
int64_t time_frame;
int fd;
int width, height;
int frame_linesize;
int bytes_per_pixel;
struct fb_var_screeninfo varinfo;
struct fb_fix_screeninfo fixinfo;
uint8_t *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);
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();
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;
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;
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,
};