FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavdevice/fbdev_dec.c
Date: 2024-04-19 17:50:32
Exec Total Coverage
Lines: 0 93 0.0%
Functions: 0 4 0.0%
Branches: 0 32 0.0%

Line Branch Exec Source
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/file_open.h"
38 #include "libavutil/internal.h"
39 #include "libavutil/log.h"
40 #include "libavutil/opt.h"
41 #include "libavutil/time.h"
42 #include "libavutil/parseutils.h"
43 #include "libavutil/pixdesc.h"
44 #include "libavformat/demux.h"
45 #include "libavformat/internal.h"
46 #include "avdevice.h"
47 #include "fbdev_common.h"
48
49 typedef struct FBDevContext {
50 AVClass *class; ///< class for private options
51 int frame_size; ///< size in bytes of a grabbed frame
52 AVRational framerate_q; ///< framerate
53 int64_t time_frame; ///< time for the next frame to output (in 1/1000000 units)
54
55 int fd; ///< framebuffer device file descriptor
56 int width, height; ///< assumed frame resolution
57 int frame_linesize; ///< linesize of the output frame, it is assumed to be constant
58 int bytes_per_pixel;
59
60 struct fb_var_screeninfo varinfo; ///< variable info;
61 struct fb_fix_screeninfo fixinfo; ///< fixed info;
62
63 uint8_t *data; ///< framebuffer data
64 } FBDevContext;
65
66 static av_cold int fbdev_read_header(AVFormatContext *avctx)
67 {
68 FBDevContext *fbdev = avctx->priv_data;
69 AVStream *st = NULL;
70 enum AVPixelFormat pix_fmt;
71 int ret, flags = O_RDONLY;
72 const char* device;
73
74 if (!(st = avformat_new_stream(avctx, NULL)))
75 return AVERROR(ENOMEM);
76 avpriv_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in microseconds */
77
78 /* NONBLOCK is ignored by the fbdev driver, only set for consistency */
79 if (avctx->flags & AVFMT_FLAG_NONBLOCK)
80 flags |= O_NONBLOCK;
81
82 if (avctx->url[0])
83 device = avctx->url;
84 else
85 device = ff_fbdev_default_device();
86
87 if ((fbdev->fd = avpriv_open(device, flags)) == -1) {
88 ret = AVERROR(errno);
89 av_log(avctx, AV_LOG_ERROR,
90 "Could not open framebuffer device '%s': %s\n",
91 device, av_err2str(ret));
92 return ret;
93 }
94
95 if (ioctl(fbdev->fd, FBIOGET_VSCREENINFO, &fbdev->varinfo) < 0) {
96 ret = AVERROR(errno);
97 av_log(avctx, AV_LOG_ERROR,
98 "FBIOGET_VSCREENINFO: %s\n", av_err2str(ret));
99 goto fail;
100 }
101
102 if (ioctl(fbdev->fd, FBIOGET_FSCREENINFO, &fbdev->fixinfo) < 0) {
103 ret = AVERROR(errno);
104 av_log(avctx, AV_LOG_ERROR,
105 "FBIOGET_FSCREENINFO: %s\n", av_err2str(ret));
106 goto fail;
107 }
108
109 pix_fmt = ff_get_pixfmt_from_fb_varinfo(&fbdev->varinfo);
110 if (pix_fmt == AV_PIX_FMT_NONE) {
111 ret = AVERROR(EINVAL);
112 av_log(avctx, AV_LOG_ERROR,
113 "Framebuffer pixel format not supported.\n");
114 goto fail;
115 }
116
117 fbdev->width = fbdev->varinfo.xres;
118 fbdev->height = fbdev->varinfo.yres;
119 fbdev->bytes_per_pixel = (fbdev->varinfo.bits_per_pixel + 7) >> 3;
120 fbdev->frame_linesize = fbdev->width * fbdev->bytes_per_pixel;
121 fbdev->frame_size = fbdev->frame_linesize * fbdev->height;
122 fbdev->time_frame = AV_NOPTS_VALUE;
123 fbdev->data = mmap(NULL, fbdev->fixinfo.smem_len, PROT_READ, MAP_SHARED, fbdev->fd, 0);
124 if (fbdev->data == MAP_FAILED) {
125 ret = AVERROR(errno);
126 av_log(avctx, AV_LOG_ERROR, "Error in mmap(): %s\n", av_err2str(ret));
127 goto fail;
128 }
129
130 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
131 st->codecpar->codec_id = AV_CODEC_ID_RAWVIDEO;
132 st->codecpar->width = fbdev->width;
133 st->codecpar->height = fbdev->height;
134 st->codecpar->format = pix_fmt;
135 st->avg_frame_rate = fbdev->framerate_q;
136 st->codecpar->bit_rate =
137 fbdev->width * fbdev->height * fbdev->bytes_per_pixel * av_q2d(fbdev->framerate_q) * 8;
138
139 av_log(avctx, AV_LOG_INFO,
140 "w:%d h:%d bpp:%d pixfmt:%s fps:%d/%d bit_rate:%"PRId64"\n",
141 fbdev->width, fbdev->height, fbdev->varinfo.bits_per_pixel,
142 av_get_pix_fmt_name(pix_fmt),
143 fbdev->framerate_q.num, fbdev->framerate_q.den,
144 st->codecpar->bit_rate);
145 return 0;
146
147 fail:
148 close(fbdev->fd);
149 return ret;
150 }
151
152 static int fbdev_read_packet(AVFormatContext *avctx, AVPacket *pkt)
153 {
154 FBDevContext *fbdev = avctx->priv_data;
155 int64_t curtime, delay;
156 struct timespec ts;
157 int i, ret;
158 uint8_t *pin, *pout;
159
160 if (fbdev->time_frame == AV_NOPTS_VALUE)
161 fbdev->time_frame = av_gettime_relative();
162
163 /* wait based on the frame rate */
164 while (1) {
165 curtime = av_gettime_relative();
166 delay = fbdev->time_frame - curtime;
167 av_log(avctx, AV_LOG_TRACE,
168 "time_frame:%"PRId64" curtime:%"PRId64" delay:%"PRId64"\n",
169 fbdev->time_frame, curtime, delay);
170 if (delay <= 0) {
171 fbdev->time_frame += INT64_C(1000000) / av_q2d(fbdev->framerate_q);
172 break;
173 }
174 if (avctx->flags & AVFMT_FLAG_NONBLOCK)
175 return AVERROR(EAGAIN);
176 ts.tv_sec = delay / 1000000;
177 ts.tv_nsec = (delay % 1000000) * 1000;
178 while (nanosleep(&ts, &ts) < 0 && errno == EINTR);
179 }
180
181 if ((ret = av_new_packet(pkt, fbdev->frame_size)) < 0)
182 return ret;
183
184 /* refresh fbdev->varinfo, visible data position may change at each call */
185 if (ioctl(fbdev->fd, FBIOGET_VSCREENINFO, &fbdev->varinfo) < 0) {
186 av_log(avctx, AV_LOG_WARNING,
187 "Error refreshing variable info: %s\n", av_err2str(AVERROR(errno)));
188 }
189
190 pkt->pts = av_gettime();
191
192 /* compute visible data offset */
193 pin = fbdev->data + fbdev->bytes_per_pixel * fbdev->varinfo.xoffset +
194 fbdev->varinfo.yoffset * fbdev->fixinfo.line_length;
195 pout = pkt->data;
196
197 for (i = 0; i < fbdev->height; i++) {
198 memcpy(pout, pin, fbdev->frame_linesize);
199 pin += fbdev->fixinfo.line_length;
200 pout += fbdev->frame_linesize;
201 }
202
203 return fbdev->frame_size;
204 }
205
206 static av_cold int fbdev_read_close(AVFormatContext *avctx)
207 {
208 FBDevContext *fbdev = avctx->priv_data;
209
210 munmap(fbdev->data, fbdev->fixinfo.smem_len);
211 close(fbdev->fd);
212
213 return 0;
214 }
215
216 static int fbdev_get_device_list(AVFormatContext *s, AVDeviceInfoList *device_list)
217 {
218 return ff_fbdev_get_device_list(device_list);
219 }
220
221 #define OFFSET(x) offsetof(FBDevContext, x)
222 #define DEC AV_OPT_FLAG_DECODING_PARAM
223 static const AVOption options[] = {
224 { "framerate","", OFFSET(framerate_q), AV_OPT_TYPE_VIDEO_RATE, {.str = "25"}, 0, INT_MAX, DEC },
225 { NULL },
226 };
227
228 static const AVClass fbdev_class = {
229 .class_name = "fbdev indev",
230 .item_name = av_default_item_name,
231 .option = options,
232 .version = LIBAVUTIL_VERSION_INT,
233 .category = AV_CLASS_CATEGORY_DEVICE_VIDEO_INPUT,
234 };
235
236 const FFInputFormat ff_fbdev_demuxer = {
237 .p.name = "fbdev",
238 .p.long_name = NULL_IF_CONFIG_SMALL("Linux framebuffer"),
239 .p.flags = AVFMT_NOFILE,
240 .p.priv_class = &fbdev_class,
241 .priv_data_size = sizeof(FBDevContext),
242 .read_header = fbdev_read_header,
243 .read_packet = fbdev_read_packet,
244 .read_close = fbdev_read_close,
245 .get_device_list = fbdev_get_device_list,
246 };
247