libavdevice/fbdev_dec.c - manifest_repos/ffmpeg - Git at Google

 /*
  * 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,
 };
	/*
	* 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,
	};