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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))); |
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 | }; |