Subversion Repositories Kolibri OS

/*

 * Copyright (c) 2011 Stefano Sabatini

 * Copyright (c) 2009 Giliard B. de Freitas 

 * Copyright (C) 2002 Gunnar Monell 

 *

 * 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 

#include 

#include 

#include 

#include 

#include 

#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,

};