blob: 3b31373fd646f2f505d404fbee1f9a2e30750c08
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; |
71 | const char* device; |
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 | |
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) { |
87 | ret = AVERROR(errno); |
88 | av_log(avctx, AV_LOG_ERROR, |
89 | "Could not open framebuffer device '%s': %s\n", |
90 | device, av_err2str(ret)); |
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->codecpar->codec_type = AVMEDIA_TYPE_VIDEO; |
130 | st->codecpar->codec_id = AV_CODEC_ID_RAWVIDEO; |
131 | st->codecpar->width = fbdev->width; |
132 | st->codecpar->height = fbdev->height; |
133 | st->codecpar->format = pix_fmt; |
134 | st->avg_frame_rate = fbdev->framerate_q; |
135 | st->codecpar->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:%"PRId64"\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 | (int64_t)st->codecpar->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_log(avctx, AV_LOG_TRACE, |
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 */ |
184 | if (ioctl(fbdev->fd, FBIOGET_VSCREENINFO, &fbdev->varinfo) < 0) { |
185 | av_log(avctx, AV_LOG_WARNING, |
186 | "Error refreshing variable info: %s\n", av_err2str(AVERROR(errno))); |
187 | } |
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, INT_MAX, 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 | }; |
246 |