[deb_ffmpeg.git] / ffmpeg / libavdevice / fbdev_dec.c

/*
 * 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->filename[0])
        device = avctx->filename;
    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->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(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, 0, 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,
};
Commit	Line	Data
2ba45a60 DM	1	/*
	2	* Copyright (c) 2011 Stefano Sabatini
	3	* Copyright (c) 2009 Giliard B. de Freitas <giliarde@gmail.com>
	4	* Copyright (C) 2002 Gunnar Monell <gmo@linux.nu>
	5	*
	6	* This file is part of FFmpeg.
	7	*
	8	* FFmpeg is free software; you can redistribute it and/or
	9	* modify it under the terms of the GNU Lesser General Public
	10	* License as published by the Free Software Foundation; either
	11	* version 2.1 of the License, or (at your option) any later version.
	12	*
	13	* FFmpeg is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	16	* Lesser General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU Lesser General Public
	19	* License along with FFmpeg; if not, write to the Free Software
	20	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
	21	*/
	22
	23	/**
	24	* @file
	25	* Linux framebuffer input device,
	26	* inspired by code from fbgrab.c by Gunnar Monell.
	27	* @see http://linux-fbdev.sourceforge.net/
	28	*/
	29
	30	#include <unistd.h>
	31	#include <fcntl.h>
	32	#include <sys/ioctl.h>
	33	#include <sys/mman.h>
	34	#include <time.h>
	35	#include <linux/fb.h>
	36
	37	#include "libavutil/internal.h"
	38	#include "libavutil/log.h"
	39	#include "libavutil/mem.h"
	40	#include "libavutil/opt.h"
	41	#include "libavutil/time.h"
	42	#include "libavutil/parseutils.h"
	43	#include "libavutil/pixdesc.h"
	44	#include "libavformat/internal.h"
	45	#include "avdevice.h"
	46	#include "fbdev_common.h"
	47
	48	typedef struct FBDevContext {
	49	AVClass *class; ///< class for private options
	50	int frame_size; ///< size in bytes of a grabbed frame
	51	AVRational framerate_q; ///< framerate
	52	int64_t time_frame; ///< time for the next frame to output (in 1/1000000 units)
	53
	54	int fd; ///< framebuffer device file descriptor
	55	int width, height; ///< assumed frame resolution
	56	int frame_linesize; ///< linesize of the output frame, it is assumed to be constant
	57	int bytes_per_pixel;
	58
	59	struct fb_var_screeninfo varinfo; ///< variable info;
	60	struct fb_fix_screeninfo fixinfo; ///< fixed info;
	61
	62	uint8_t *data; ///< framebuffer data
	63	} FBDevContext;
	64
65	static av_cold int fbdev_read_header(AVFormatContext *avctx)
66	{
67	FBDevContext *fbdev = avctx->priv_data;
68	AVStream *st = NULL;
69	enum AVPixelFormat pix_fmt;
70	int ret, flags = O_RDONLY;
f6fa7814	71	const char* device;
2ba45a60 DM	72
	73	if (!(st = avformat_new_stream(avctx, NULL)))
	74	return AVERROR(ENOMEM);
	75	avpriv_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in microseconds */
	76
	77	/* NONBLOCK is ignored by the fbdev driver, only set for consistency */
	78	if (avctx->flags & AVFMT_FLAG_NONBLOCK)
	79	flags \|= O_NONBLOCK;
	80
f6fa7814 DM	81	if (avctx->filename[0])
	82	device = avctx->filename;
	83	else
	84	device = ff_fbdev_default_device();
	85
	86	if ((fbdev->fd = avpriv_open(device, flags)) == -1) {
2ba45a60 DM	87	ret = AVERROR(errno);
	88	av_log(avctx, AV_LOG_ERROR,
	89	"Could not open framebuffer device '%s': %s\n",
f6fa7814	90	device, av_err2str(ret));
2ba45a60 DM	91	return ret;
	92	}
	93
	94	if (ioctl(fbdev->fd, FBIOGET_VSCREENINFO, &fbdev->varinfo) < 0) {
	95	ret = AVERROR(errno);
	96	av_log(avctx, AV_LOG_ERROR,
	97	"FBIOGET_VSCREENINFO: %s\n", av_err2str(ret));
	98	goto fail;
	99	}
	100
	101	if (ioctl(fbdev->fd, FBIOGET_FSCREENINFO, &fbdev->fixinfo) < 0) {
	102	ret = AVERROR(errno);
	103	av_log(avctx, AV_LOG_ERROR,
	104	"FBIOGET_FSCREENINFO: %s\n", av_err2str(ret));
	105	goto fail;
	106	}
	107
	108	pix_fmt = ff_get_pixfmt_from_fb_varinfo(&fbdev->varinfo);
	109	if (pix_fmt == AV_PIX_FMT_NONE) {
	110	ret = AVERROR(EINVAL);
	111	av_log(avctx, AV_LOG_ERROR,
	112	"Framebuffer pixel format not supported.\n");
	113	goto fail;
	114	}
	115
	116	fbdev->width = fbdev->varinfo.xres;
	117	fbdev->height = fbdev->varinfo.yres;
	118	fbdev->bytes_per_pixel = (fbdev->varinfo.bits_per_pixel + 7) >> 3;
	119	fbdev->frame_linesize = fbdev->width * fbdev->bytes_per_pixel;
	120	fbdev->frame_size = fbdev->frame_linesize * fbdev->height;
	121	fbdev->time_frame = AV_NOPTS_VALUE;
	122	fbdev->data = mmap(NULL, fbdev->fixinfo.smem_len, PROT_READ, MAP_SHARED, fbdev->fd, 0);
	123	if (fbdev->data == MAP_FAILED) {
	124	ret = AVERROR(errno);
	125	av_log(avctx, AV_LOG_ERROR, "Error in mmap(): %s\n", av_err2str(ret));
	126	goto fail;
	127	}
	128
	129	st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
	130	st->codec->codec_id = AV_CODEC_ID_RAWVIDEO;
	131	st->codec->width = fbdev->width;
	132	st->codec->height = fbdev->height;
	133	st->codec->pix_fmt = pix_fmt;
	134	st->codec->time_base = av_inv_q(fbdev->framerate_q);
	135	st->codec->bit_rate =
	136	fbdev->width * fbdev->height * fbdev->bytes_per_pixel * av_q2d(fbdev->framerate_q) * 8;
	137
	138	av_log(avctx, AV_LOG_INFO,
	139	"w:%d h:%d bpp:%d pixfmt:%s fps:%d/%d bit_rate:%d\n",
	140	fbdev->width, fbdev->height, fbdev->varinfo.bits_per_pixel,
	141	av_get_pix_fmt_name(pix_fmt),
	142	fbdev->framerate_q.num, fbdev->framerate_q.den,
	143	st->codec->bit_rate);
	144	return 0;
	145
	146	fail:
	147	close(fbdev->fd);
	148	return ret;
	149	}
	150
	151	static int fbdev_read_packet(AVFormatContext avctx, AVPacket pkt)
	152	{
	153	FBDevContext *fbdev = avctx->priv_data;
	154	int64_t curtime, delay;
155	struct timespec ts;
156	int i, ret;
157	uint8_t pin, pout;
158
159	if (fbdev->time_frame == AV_NOPTS_VALUE)
160	fbdev->time_frame = av_gettime();
161
162	/* wait based on the frame rate */
163	while (1) {
164	curtime = av_gettime();
165	delay = fbdev->time_frame - curtime;
166	av_dlog(avctx,
167	"time_frame:%"PRId64" curtime:%"PRId64" delay:%"PRId64"\n",
168	fbdev->time_frame, curtime, delay);
169	if (delay <= 0) {
170	fbdev->time_frame += INT64_C(1000000) / av_q2d(fbdev->framerate_q);
171	break;
172	}
173	if (avctx->flags & AVFMT_FLAG_NONBLOCK)
174	return AVERROR(EAGAIN);
175	ts.tv_sec = delay / 1000000;
176	ts.tv_nsec = (delay % 1000000) * 1000;
177	while (nanosleep(&ts, &ts) < 0 && errno == EINTR);
178	}
179
180	if ((ret = av_new_packet(pkt, fbdev->frame_size)) < 0)
181	return ret;
182
183	/* refresh fbdev->varinfo, visible data position may change at each call */
f6fa7814	184	if (ioctl(fbdev->fd, FBIOGET_VSCREENINFO, &fbdev->varinfo) < 0) {
2ba45a60	185	av_log(avctx, AV_LOG_WARNING,
f6fa7814 DM	186	"Error refreshing variable info: %s\n", av_err2str(AVERROR(errno)));
f6fa7814 DM	187	}
2ba45a60 DM	188
	189	pkt->pts = curtime;
	190
	191	/* compute visible data offset */
	192	pin = fbdev->data + fbdev->bytes_per_pixel * fbdev->varinfo.xoffset +
	193	fbdev->varinfo.yoffset * fbdev->fixinfo.line_length;
	194	pout = pkt->data;
	195
	196	for (i = 0; i < fbdev->height; i++) {
	197	memcpy(pout, pin, fbdev->frame_linesize);
	198	pin += fbdev->fixinfo.line_length;
	199	pout += fbdev->frame_linesize;
	200	}
	201
	202	return fbdev->frame_size;
	203	}
	204
	205	static av_cold int fbdev_read_close(AVFormatContext *avctx)
	206	{
	207	FBDevContext *fbdev = avctx->priv_data;
	208
	209	munmap(fbdev->data, fbdev->fixinfo.smem_len);
	210	close(fbdev->fd);
	211
	212	return 0;
	213	}
	214
	215	static int fbdev_get_device_list(AVFormatContext s, AVDeviceInfoList device_list)
	216	{
	217	return ff_fbdev_get_device_list(device_list);
	218	}
	219
	220	#define OFFSET(x) offsetof(FBDevContext, x)
	221	#define DEC AV_OPT_FLAG_DECODING_PARAM
	222	static const AVOption options[] = {
	223	{ "framerate","", OFFSET(framerate_q), AV_OPT_TYPE_VIDEO_RATE, {.str = "25"}, 0, 0, DEC },
	224	{ NULL },
	225	};
	226
	227	static const AVClass fbdev_class = {
	228	.class_name = "fbdev indev",
	229	.item_name = av_default_item_name,
	230	.option = options,
	231	.version = LIBAVUTIL_VERSION_INT,
	232	.category = AV_CLASS_CATEGORY_DEVICE_VIDEO_INPUT,
	233	};
	234
	235	AVInputFormat ff_fbdev_demuxer = {
	236	.name = "fbdev",
	237	.long_name = NULL_IF_CONFIG_SMALL("Linux framebuffer"),
	238	.priv_data_size = sizeof(FBDevContext),
	239	.read_header = fbdev_read_header,
	240	.read_packet = fbdev_read_packet,
	241	.read_close = fbdev_read_close,
	242	.get_device_list = fbdev_get_device_list,
	243	.flags = AVFMT_NOFILE,
	244	.priv_class = &fbdev_class,
	245	};