Revision c6f95144

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Changelog
80 80
- Bitmap Brothers JV playback system
81 81
- Apple HTTP Live Streaming protocol handler
82 82
- sndio support for playback and record
83
- Linux framebuffer input device added
83 84

  
84 85

  
85 86
version 0.6:
configure
1430 1430
alsa_outdev_deps="alsa_asoundlib_h"
1431 1431
bktr_indev_deps_any="dev_bktr_ioctl_bt848_h machine_ioctl_bt848_h dev_video_bktr_ioctl_bt848_h dev_ic_bt8xx_h"
1432 1432
dv1394_indev_deps="dv1394 dv_demuxer"
1433
fbdev_indev_deps="linux_fb_h"
1433 1434
jack_indev_deps="jack_jack_h"
1434 1435
libdc1394_indev_deps="libdc1394"
1435 1436
oss_indev_deps_any="soundcard_h sys_soundcard_h"
......
2897 2898

  
2898 2899
texi2html -version > /dev/null 2>&1 && enable texi2html || disable texi2html
2899 2900

  
2901
check_header linux/fb.h
2900 2902
check_header linux/videodev.h
2901 2903
check_header linux/videodev2.h
2902 2904
check_header sys/videoio.h
doc/indevs.texi
59 59

  
60 60
Linux DV 1394 input device.
61 61

  
62
@section fbdev
63

  
64
Linux framebuffer input device.
65

  
66
The Linux framebuffer is a graphic hardware-independent abstraction
67
layer to show graphics on a computer monitor, typically on the
68
console. It is accessed through a file device node, usually
69
@file{/dev/fb0}.
70

  
71
For more detailed information read the file
72
Documentation/fb/framebuffer.txt included in the Linux source tree.
73

  
74
To record from the framebuffer device @file{/dev/fb0} with
75
@file{ffmpeg}:
76
@example
77
ffmpeg -f fbdev -r 10 -i /dev/fb0 out.avi
78
@end example
79

  
80
You can take a single screenshot image with the command:
81
@example
82
ffmpeg -f fbdev -vframes 1 -r 1 -i /dev/fb0 screenshot.jpeg
83
@end example
84

  
85
See also @url{http://linux-fbdev.sourceforge.net/}, and fbset(1).
86

  
62 87
@section jack
63 88

  
64 89
JACK input device.
libavdevice/Makefile
14 14
                                            alsa-audio-enc.o
15 15
OBJS-$(CONFIG_BKTR_INDEV)                += bktr.o
16 16
OBJS-$(CONFIG_DV1394_INDEV)              += dv1394.o
17
OBJS-$(CONFIG_FBDEV_INDEV)               += fbdev.o
17 18
OBJS-$(CONFIG_JACK_INDEV)                += jack_audio.o
18 19
OBJS-$(CONFIG_OSS_INDEV)                 += oss_audio.o
19 20
OBJS-$(CONFIG_OSS_OUTDEV)                += oss_audio.o
libavdevice/alldevices.c
42 42
    REGISTER_INOUTDEV (ALSA, alsa);
43 43
    REGISTER_INDEV    (BKTR, bktr);
44 44
    REGISTER_INDEV    (DV1394, dv1394);
45
    REGISTER_INDEV    (FBDEV, fbdev);
45 46
    REGISTER_INDEV    (JACK, jack);
46 47
    REGISTER_INOUTDEV (OSS, oss);
47 48
    REGISTER_INOUTDEV (SNDIO, sndio);
libavdevice/avdevice.h
22 22
#include "libavutil/avutil.h"
23 23

  
24 24
#define LIBAVDEVICE_VERSION_MAJOR 52
25
#define LIBAVDEVICE_VERSION_MINOR  3
25
#define LIBAVDEVICE_VERSION_MINOR  4
26 26
#define LIBAVDEVICE_VERSION_MICRO  0
27 27

  
28 28
#define LIBAVDEVICE_VERSION_INT AV_VERSION_INT(LIBAVDEVICE_VERSION_MAJOR, \
libavdevice/fbdev.c
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 Libav.
7
 *
8
 * Libav 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
 * Libav 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 Libav; 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 also http://linux-fbdev.sourceforge.net/.
28
 */
29

  
30
/* #define DEBUG */
31

  
32
#include <unistd.h>
33
#include <fcntl.h>
34
#include <sys/ioctl.h>
35
#include <sys/time.h>
36
#include <sys/mman.h>
37
#include <time.h>
38
#include <linux/fb.h>
39

  
40
#include "libavutil/mem.h"
41
#include "libavutil/pixdesc.h"
42
#include "libavformat/avformat.h"
43

  
44
struct rgb_pixfmt_map_entry {
45
    int bits_per_pixel;
46
    int red_offset, green_offset, blue_offset, alpha_offset;
47
    enum PixelFormat pixfmt;
48
};
49

  
50
static struct rgb_pixfmt_map_entry rgb_pixfmt_map[] = {
51
    // bpp, red_offset,  green_offset, blue_offset, alpha_offset, pixfmt
52
    {  32,       0,           8,          16,           24,   PIX_FMT_RGBA  },
53
    {  32,      16,           8,           0,           24,   PIX_FMT_BGRA  },
54
    {  32,       8,          16,          24,            0,   PIX_FMT_ARGB  },
55
    {  32,       3,           2,           8,            0,   PIX_FMT_ABGR  },
56
    {  24,       0,           8,          16,            0,   PIX_FMT_RGB24 },
57
    {  24,      16,           8,           0,            0,   PIX_FMT_BGR24 },
58
};
59

  
60
static enum PixelFormat get_pixfmt_from_fb_varinfo(struct fb_var_screeninfo *varinfo)
61
{
62
    int i;
63

  
64
    for (i = 0; i < FF_ARRAY_ELEMS(rgb_pixfmt_map); i++) {
65
        struct rgb_pixfmt_map_entry *entry = &rgb_pixfmt_map[i];
66
        if (entry->bits_per_pixel == varinfo->bits_per_pixel &&
67
            entry->red_offset     == varinfo->red.offset     &&
68
            entry->green_offset   == varinfo->green.offset   &&
69
            entry->blue_offset    == varinfo->blue.offset)
70
            return entry->pixfmt;
71
    }
72

  
73
    return PIX_FMT_NONE;
74
}
75

  
76
typedef struct {
77
    int frame_size;          ///< size in bytes of a grabbed frame
78
    AVRational time_base;    ///< time base
79
    int64_t time_frame;      ///< time for the next frame to output (in 1/1000000 units)
80

  
81
    int fd;                  ///< framebuffer device file descriptor
82
    int width, heigth;       ///< assumed frame resolution
83
    int frame_linesize;      ///< linesize of the output frame, it is assumed to be constant
84
    int bytes_per_pixel;
85

  
86
    struct fb_var_screeninfo varinfo; ///< variable info;
87
    struct fb_fix_screeninfo fixinfo; ///< fixed    info;
88

  
89
    uint8_t *data;           ///< framebuffer data
90
} FBDevContext;
91

  
92
av_cold static int fbdev_read_header(AVFormatContext *avctx,
93
                                     AVFormatParameters *ap)
94
{
95
    FBDevContext *fbdev = avctx->priv_data;
96
    AVStream *st = NULL;
97
    enum PixelFormat pix_fmt;
98
    int ret, flags = O_RDONLY;
99

  
100
    if (!(st = av_new_stream(avctx, 0)))
101
        return AVERROR(ENOMEM);
102
    av_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in microseconds */
103

  
104
    if (ap->time_base.den <= 0) {
105
        av_log(avctx, AV_LOG_ERROR, "Invalid time base %d/%d\n",
106
               ap->time_base.num, ap->time_base.den);
107
        return AVERROR(EINVAL);
108
    }
109

  
110
    /* NONBLOCK is ignored by the fbdev driver, only set for consistency */
111
    if (avctx->flags & AVFMT_FLAG_NONBLOCK)
112
        flags |= O_NONBLOCK;
113

  
114
    if ((fbdev->fd = open(avctx->filename, flags)) == -1) {
115
        ret = AVERROR(errno);
116
        av_log(avctx, AV_LOG_ERROR,
117
               "Could not open framebuffer device '%s': %s\n",
118
               avctx->filename, strerror(ret));
119
        return ret;
120
    }
121

  
122
    if (ioctl(fbdev->fd, FBIOGET_VSCREENINFO, &fbdev->varinfo) < 0) {
123
        ret = AVERROR(errno);
124
        av_log(avctx, AV_LOG_ERROR,
125
               "FBIOGET_VSCREENINFO: %s\n", strerror(errno));
126
        goto fail;
127
    }
128

  
129
    if (ioctl(fbdev->fd, FBIOGET_FSCREENINFO, &fbdev->fixinfo) < 0) {
130
        ret = AVERROR(errno);
131
        av_log(avctx, AV_LOG_ERROR,
132
               "FBIOGET_FSCREENINFO: %s\n", strerror(errno));
133
        goto fail;
134
    }
135

  
136
    pix_fmt = get_pixfmt_from_fb_varinfo(&fbdev->varinfo);
137
    if (pix_fmt == PIX_FMT_NONE) {
138
        ret = AVERROR(EINVAL);
139
        av_log(avctx, AV_LOG_ERROR,
140
               "Framebuffer pixel format not supported.\n");
141
        goto fail;
142
    }
143

  
144
    fbdev->width           = fbdev->varinfo.xres;
145
    fbdev->heigth          = fbdev->varinfo.yres;
146
    fbdev->bytes_per_pixel = (fbdev->varinfo.bits_per_pixel + 7) >> 3;
147
    fbdev->frame_linesize  = fbdev->width * fbdev->bytes_per_pixel;
148
    fbdev->frame_size      = fbdev->frame_linesize * fbdev->heigth;
149
    fbdev->time_base       = ap->time_base;
150
    fbdev->time_frame      = AV_NOPTS_VALUE;
151
    fbdev->data = mmap(NULL, fbdev->fixinfo.smem_len, PROT_READ, MAP_SHARED, fbdev->fd, 0);
152
    if (fbdev->data == MAP_FAILED) {
153
        ret = AVERROR(errno);
154
        av_log(avctx, AV_LOG_ERROR, "Error in mmap(): %s\n", strerror(errno));
155
        goto fail;
156
    }
157

  
158
    st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
159
    st->codec->codec_id   = CODEC_ID_RAWVIDEO;
160
    st->codec->width      = fbdev->width;
161
    st->codec->height     = fbdev->heigth;
162
    st->codec->pix_fmt    = pix_fmt;
163
    st->codec->time_base  = ap->time_base;
164
    st->codec->bit_rate   =
165
        fbdev->width * fbdev->heigth * fbdev->bytes_per_pixel / av_q2d(ap->time_base) * 8;
166

  
167
    av_log(avctx, AV_LOG_INFO,
168
           "w:%d h:%d bpp:%d pixfmt:%s tb:%d/%d bit_rate:%d\n",
169
           fbdev->width, fbdev->heigth, fbdev->varinfo.bits_per_pixel,
170
           av_pix_fmt_descriptors[pix_fmt].name,
171
           ap->time_base.num, ap->time_base.den,
172
           st->codec->bit_rate);
173
    return 0;
174

  
175
fail:
176
    close(fbdev->fd);
177
    return ret;
178
}
179

  
180
static int fbdev_read_packet(AVFormatContext *avctx, AVPacket *pkt)
181
{
182
    FBDevContext *fbdev = avctx->priv_data;
183
    int64_t curtime, delay;
184
    struct timespec ts;
185
    int i, ret;
186
    uint8_t *pin, *pout;
187

  
188
    if (fbdev->time_frame == AV_NOPTS_VALUE)
189
        fbdev->time_frame = av_gettime();
190

  
191
    /* wait based on the frame rate */
192
    curtime = av_gettime();
193
    delay = fbdev->time_frame - curtime;
194
    av_dlog(avctx,
195
            "time_frame:%"PRId64" curtime:%"PRId64" delay:%"PRId64"\n",
196
            fbdev->time_frame, curtime, delay);
197
    if (delay > 0) {
198
        if (avctx->flags & AVFMT_FLAG_NONBLOCK)
199
            return AVERROR(EAGAIN);
200
        ts.tv_sec  =  delay / 1000000;
201
        ts.tv_nsec = (delay % 1000000) * 1000;
202
        while (nanosleep(&ts, &ts) < 0 && errno == EINTR);
203
    }
204
    /* compute the time of the next frame */
205
    fbdev->time_frame += INT64_C(1000000) * av_q2d(fbdev->time_base);
206

  
207
    if ((ret = av_new_packet(pkt, fbdev->frame_size)) < 0)
208
        return ret;
209

  
210
    /* refresh fbdev->varinfo, visible data position may change at each call */
211
    if (ioctl(fbdev->fd, FBIOGET_VSCREENINFO, &fbdev->varinfo) < 0)
212
        av_log(avctx, AV_LOG_WARNING,
213
               "Error refreshing variable info: %s\n", strerror(errno));
214

  
215
    pkt->pts = curtime;
216

  
217
    /* compute visible data offset */
218
    pin = fbdev->data + fbdev->bytes_per_pixel * fbdev->varinfo.xoffset +
219
                        fbdev->varinfo.yoffset * fbdev->fixinfo.line_length;
220
    pout = pkt->data;
221

  
222
    // TODO it'd be nice if the lines were aligned
223
    for (i = 0; i < fbdev->heigth; i++) {
224
        memcpy(pout, pin, fbdev->frame_linesize);
225
        pin  += fbdev->fixinfo.line_length;
226
        pout += fbdev->frame_linesize;
227
    }
228

  
229
    return fbdev->frame_size;
230
}
231

  
232
av_cold static int fbdev_read_close(AVFormatContext *avctx)
233
{
234
    FBDevContext *fbdev = avctx->priv_data;
235

  
236
    munmap(fbdev->data, fbdev->frame_size);
237
    close(fbdev->fd);
238

  
239
    return 0;
240
}
241

  
242
AVInputFormat ff_fbdev_demuxer = {
243
    .name           = "fbdev",
244
    .long_name      = NULL_IF_CONFIG_SMALL("Linux framebuffer"),
245
    .priv_data_size = sizeof(FBDevContext),
246
    .read_header    = fbdev_read_header,
247
    .read_packet    = fbdev_read_packet,
248
    .read_close     = fbdev_read_close,
249
    .flags          = AVFMT_NOFILE,
250
};

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