FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavdevice/fbdev_enc.c
Date: 2022-12-06 04:36:11
Exec Total Coverage
Lines: 0 93 0.0%
Functions: 0 4 0.0%
Branches: 0 42 0.0%

Line Branch Exec Source
1 /*
2 * Copyright (c) 2013 Lukasz Marek
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21 #include <unistd.h>
22 #include <fcntl.h>
23 #include <sys/ioctl.h>
24 #include <sys/mman.h>
25 #include <linux/fb.h>
26 #include "libavutil/file_open.h"
27 #include "libavutil/pixdesc.h"
28 #include "libavutil/log.h"
29 #include "libavutil/opt.h"
30 #include "libavformat/avformat.h"
31 #include "fbdev_common.h"
32 #include "avdevice.h"
33
34 typedef struct {
35 AVClass *class; ///< class for private options
36 int xoffset; ///< x coordinate of top left corner
37 int yoffset; ///< y coordinate of top left corner
38 struct fb_var_screeninfo varinfo; ///< framebuffer variable info
39 struct fb_fix_screeninfo fixinfo; ///< framebuffer fixed info
40 int fd; ///< framebuffer device file descriptor
41 uint8_t *data; ///< framebuffer data
42 } FBDevContext;
43
44 static av_cold int fbdev_write_header(AVFormatContext *h)
45 {
46 FBDevContext *fbdev = h->priv_data;
47 enum AVPixelFormat pix_fmt;
48 int ret, flags = O_RDWR;
49 const char* device;
50
51 if (h->nb_streams != 1 || h->streams[0]->codecpar->codec_type != AVMEDIA_TYPE_VIDEO) {
52 av_log(fbdev, AV_LOG_ERROR, "Only a single video stream is supported.\n");
53 return AVERROR(EINVAL);
54 }
55
56 if (h->url[0])
57 device = h->url;
58 else
59 device = ff_fbdev_default_device();
60
61 if ((fbdev->fd = avpriv_open(device, flags)) == -1) {
62 ret = AVERROR(errno);
63 av_log(h, AV_LOG_ERROR,
64 "Could not open framebuffer device '%s': %s\n",
65 device, av_err2str(ret));
66 return ret;
67 }
68
69 if (ioctl(fbdev->fd, FBIOGET_VSCREENINFO, &fbdev->varinfo) < 0) {
70 ret = AVERROR(errno);
71 av_log(h, AV_LOG_ERROR, "FBIOGET_VSCREENINFO: %s\n", av_err2str(ret));
72 goto fail;
73 }
74
75 if (ioctl(fbdev->fd, FBIOGET_FSCREENINFO, &fbdev->fixinfo) < 0) {
76 ret = AVERROR(errno);
77 av_log(h, AV_LOG_ERROR, "FBIOGET_FSCREENINFO: %s\n", av_err2str(ret));
78 goto fail;
79 }
80
81 pix_fmt = ff_get_pixfmt_from_fb_varinfo(&fbdev->varinfo);
82 if (pix_fmt == AV_PIX_FMT_NONE) {
83 ret = AVERROR(EINVAL);
84 av_log(h, AV_LOG_ERROR, "Framebuffer pixel format not supported.\n");
85 goto fail;
86 }
87
88 fbdev->data = mmap(NULL, fbdev->fixinfo.smem_len, PROT_WRITE, MAP_SHARED, fbdev->fd, 0);
89 if (fbdev->data == MAP_FAILED) {
90 ret = AVERROR(errno);
91 av_log(h, AV_LOG_ERROR, "Error in mmap(): %s\n", av_err2str(ret));
92 goto fail;
93 }
94
95 return 0;
96 fail:
97 close(fbdev->fd);
98 return ret;
99 }
100
101 static int fbdev_write_packet(AVFormatContext *h, AVPacket *pkt)
102 {
103 FBDevContext *fbdev = h->priv_data;
104 const uint8_t *pin;
105 uint8_t *pout;
106 enum AVPixelFormat fb_pix_fmt;
107 int disp_height;
108 int bytes_to_copy;
109 AVCodecParameters *par = h->streams[0]->codecpar;
110 enum AVPixelFormat video_pix_fmt = par->format;
111 int video_width = par->width;
112 int video_height = par->height;
113 int bytes_per_pixel = ((par->bits_per_coded_sample + 7) >> 3);
114 int src_line_size = video_width * bytes_per_pixel;
115 int i;
116
117 if (ioctl(fbdev->fd, FBIOGET_VSCREENINFO, &fbdev->varinfo) < 0)
118 av_log(h, AV_LOG_WARNING,
119 "Error refreshing variable info: %s\n", av_err2str(AVERROR(errno)));
120
121 fb_pix_fmt = ff_get_pixfmt_from_fb_varinfo(&fbdev->varinfo);
122
123 if (fb_pix_fmt != video_pix_fmt) {
124 av_log(h, AV_LOG_ERROR, "Pixel format %s is not supported, use %s\n",
125 av_get_pix_fmt_name(video_pix_fmt), av_get_pix_fmt_name(fb_pix_fmt));
126 return AVERROR(EINVAL);
127 }
128
129 disp_height = FFMIN(fbdev->varinfo.yres, video_height);
130 bytes_to_copy = FFMIN(fbdev->varinfo.xres, video_width) * bytes_per_pixel;
131
132 pin = pkt->data;
133 pout = fbdev->data +
134 bytes_per_pixel * fbdev->varinfo.xoffset +
135 fbdev->varinfo.yoffset * fbdev->fixinfo.line_length;
136
137 if (fbdev->xoffset) {
138 if (fbdev->xoffset < 0) {
139 if (-fbdev->xoffset >= video_width) //nothing to display
140 return 0;
141 bytes_to_copy += fbdev->xoffset * bytes_per_pixel;
142 pin -= fbdev->xoffset * bytes_per_pixel;
143 } else {
144 int diff = (video_width + fbdev->xoffset) - fbdev->varinfo.xres;
145 if (diff > 0) {
146 if (diff >= video_width) //nothing to display
147 return 0;
148 bytes_to_copy -= diff * bytes_per_pixel;
149 }
150 pout += bytes_per_pixel * fbdev->xoffset;
151 }
152 }
153
154 if (fbdev->yoffset) {
155 if (fbdev->yoffset < 0) {
156 if (-fbdev->yoffset >= video_height) //nothing to display
157 return 0;
158 disp_height += fbdev->yoffset;
159 pin -= fbdev->yoffset * src_line_size;
160 } else {
161 int diff = (video_height + fbdev->yoffset) - fbdev->varinfo.yres;
162 if (diff > 0) {
163 if (diff >= video_height) //nothing to display
164 return 0;
165 disp_height -= diff;
166 }
167 pout += fbdev->yoffset * fbdev->fixinfo.line_length;
168 }
169 }
170
171 for (i = 0; i < disp_height; i++) {
172 memcpy(pout, pin, bytes_to_copy);
173 pout += fbdev->fixinfo.line_length;
174 pin += src_line_size;
175 }
176
177 return 0;
178 }
179
180 static av_cold int fbdev_write_trailer(AVFormatContext *h)
181 {
182 FBDevContext *fbdev = h->priv_data;
183 munmap(fbdev->data, fbdev->fixinfo.smem_len);
184 close(fbdev->fd);
185 return 0;
186 }
187
188 static int fbdev_get_device_list(AVFormatContext *s, AVDeviceInfoList *device_list)
189 {
190 return ff_fbdev_get_device_list(device_list);
191 }
192
193 #define OFFSET(x) offsetof(FBDevContext, x)
194 #define ENC AV_OPT_FLAG_ENCODING_PARAM
195 static const AVOption options[] = {
196 { "xoffset", "set x coordinate of top left corner", OFFSET(xoffset), AV_OPT_TYPE_INT, {.i64 = 0}, INT_MIN, INT_MAX, ENC },
197 { "yoffset", "set y coordinate of top left corner", OFFSET(yoffset), AV_OPT_TYPE_INT, {.i64 = 0}, INT_MIN, INT_MAX, ENC },
198 { NULL }
199 };
200
201 static const AVClass fbdev_class = {
202 .class_name = "fbdev outdev",
203 .item_name = av_default_item_name,
204 .option = options,
205 .version = LIBAVUTIL_VERSION_INT,
206 .category = AV_CLASS_CATEGORY_DEVICE_VIDEO_OUTPUT,
207 };
208
209 const AVOutputFormat ff_fbdev_muxer = {
210 .name = "fbdev",
211 .long_name = NULL_IF_CONFIG_SMALL("Linux framebuffer"),
212 .priv_data_size = sizeof(FBDevContext),
213 .audio_codec = AV_CODEC_ID_NONE,
214 .video_codec = AV_CODEC_ID_RAWVIDEO,
215 .write_header = fbdev_write_header,
216 .write_packet = fbdev_write_packet,
217 .write_trailer = fbdev_write_trailer,
218 .get_device_list = fbdev_get_device_list,
219 .flags = AVFMT_NOFILE | AVFMT_VARIABLE_FPS | AVFMT_NOTIMESTAMPS,
220 .priv_class = &fbdev_class,
221 };
222