FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavdevice/fbdev_enc.c
Date: 2024-07-16 12:46:59
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 "libavformat/mux.h"
32 #include "fbdev_common.h"
33 #include "avdevice.h"
34
35 typedef struct {
36 AVClass *class; ///< class for private options
37 int xoffset; ///< x coordinate of top left corner
38 int yoffset; ///< y coordinate of top left corner
39 struct fb_var_screeninfo varinfo; ///< framebuffer variable info
40 struct fb_fix_screeninfo fixinfo; ///< framebuffer fixed info
41 int fd; ///< framebuffer device file descriptor
42 uint8_t *data; ///< framebuffer data
43 } FBDevContext;
44
45 static av_cold int fbdev_write_header(AVFormatContext *h)
46 {
47 FBDevContext *fbdev = h->priv_data;
48 enum AVPixelFormat pix_fmt;
49 int ret, flags = O_RDWR;
50 const char* device;
51
52 if (h->nb_streams != 1 || h->streams[0]->codecpar->codec_type != AVMEDIA_TYPE_VIDEO) {
53 av_log(fbdev, AV_LOG_ERROR, "Only a single video stream is supported.\n");
54 return AVERROR(EINVAL);
55 }
56
57 if (h->url[0])
58 device = h->url;
59 else
60 device = ff_fbdev_default_device();
61
62 if ((fbdev->fd = avpriv_open(device, flags)) == -1) {
63 ret = AVERROR(errno);
64 av_log(h, AV_LOG_ERROR,
65 "Could not open framebuffer device '%s': %s\n",
66 device, av_err2str(ret));
67 return ret;
68 }
69
70 if (ioctl(fbdev->fd, FBIOGET_VSCREENINFO, &fbdev->varinfo) < 0) {
71 ret = AVERROR(errno);
72 av_log(h, AV_LOG_ERROR, "FBIOGET_VSCREENINFO: %s\n", av_err2str(ret));
73 goto fail;
74 }
75
76 if (ioctl(fbdev->fd, FBIOGET_FSCREENINFO, &fbdev->fixinfo) < 0) {
77 ret = AVERROR(errno);
78 av_log(h, AV_LOG_ERROR, "FBIOGET_FSCREENINFO: %s\n", av_err2str(ret));
79 goto fail;
80 }
81
82 pix_fmt = ff_get_pixfmt_from_fb_varinfo(&fbdev->varinfo);
83 if (pix_fmt == AV_PIX_FMT_NONE) {
84 ret = AVERROR(EINVAL);
85 av_log(h, AV_LOG_ERROR, "Framebuffer pixel format not supported.\n");
86 goto fail;
87 }
88
89 fbdev->data = mmap(NULL, fbdev->fixinfo.smem_len, PROT_WRITE, MAP_SHARED, fbdev->fd, 0);
90 if (fbdev->data == MAP_FAILED) {
91 ret = AVERROR(errno);
92 av_log(h, AV_LOG_ERROR, "Error in mmap(): %s\n", av_err2str(ret));
93 goto fail;
94 }
95
96 return 0;
97 fail:
98 close(fbdev->fd);
99 return ret;
100 }
101
102 static int fbdev_write_packet(AVFormatContext *h, AVPacket *pkt)
103 {
104 FBDevContext *fbdev = h->priv_data;
105 const uint8_t *pin;
106 uint8_t *pout;
107 enum AVPixelFormat fb_pix_fmt;
108 int disp_height;
109 int bytes_to_copy;
110 AVCodecParameters *par = h->streams[0]->codecpar;
111 enum AVPixelFormat video_pix_fmt = par->format;
112 int video_width = par->width;
113 int video_height = par->height;
114 int bytes_per_pixel = ((par->bits_per_coded_sample + 7) >> 3);
115 int src_line_size = video_width * bytes_per_pixel;
116 int i;
117
118 if (ioctl(fbdev->fd, FBIOGET_VSCREENINFO, &fbdev->varinfo) < 0)
119 av_log(h, AV_LOG_WARNING,
120 "Error refreshing variable info: %s\n", av_err2str(AVERROR(errno)));
121
122 fb_pix_fmt = ff_get_pixfmt_from_fb_varinfo(&fbdev->varinfo);
123
124 if (fb_pix_fmt != video_pix_fmt) {
125 av_log(h, AV_LOG_ERROR, "Pixel format %s is not supported, use %s\n",
126 av_get_pix_fmt_name(video_pix_fmt), av_get_pix_fmt_name(fb_pix_fmt));
127 return AVERROR(EINVAL);
128 }
129
130 disp_height = FFMIN(fbdev->varinfo.yres, video_height);
131 bytes_to_copy = FFMIN(fbdev->varinfo.xres, video_width) * bytes_per_pixel;
132
133 pin = pkt->data;
134 pout = fbdev->data +
135 bytes_per_pixel * fbdev->varinfo.xoffset +
136 fbdev->varinfo.yoffset * fbdev->fixinfo.line_length;
137
138 if (fbdev->xoffset) {
139 if (fbdev->xoffset < 0) {
140 if (-fbdev->xoffset >= video_width) //nothing to display
141 return 0;
142 bytes_to_copy += fbdev->xoffset * bytes_per_pixel;
143 pin -= fbdev->xoffset * bytes_per_pixel;
144 } else {
145 int diff = (video_width + fbdev->xoffset) - fbdev->varinfo.xres;
146 if (diff > 0) {
147 if (diff >= video_width) //nothing to display
148 return 0;
149 bytes_to_copy -= diff * bytes_per_pixel;
150 }
151 pout += bytes_per_pixel * fbdev->xoffset;
152 }
153 }
154
155 if (fbdev->yoffset) {
156 if (fbdev->yoffset < 0) {
157 if (-fbdev->yoffset >= video_height) //nothing to display
158 return 0;
159 disp_height += fbdev->yoffset;
160 pin -= fbdev->yoffset * src_line_size;
161 } else {
162 int diff = (video_height + fbdev->yoffset) - fbdev->varinfo.yres;
163 if (diff > 0) {
164 if (diff >= video_height) //nothing to display
165 return 0;
166 disp_height -= diff;
167 }
168 pout += fbdev->yoffset * fbdev->fixinfo.line_length;
169 }
170 }
171
172 for (i = 0; i < disp_height; i++) {
173 memcpy(pout, pin, bytes_to_copy);
174 pout += fbdev->fixinfo.line_length;
175 pin += src_line_size;
176 }
177
178 return 0;
179 }
180
181 static av_cold int fbdev_write_trailer(AVFormatContext *h)
182 {
183 FBDevContext *fbdev = h->priv_data;
184 munmap(fbdev->data, fbdev->fixinfo.smem_len);
185 close(fbdev->fd);
186 return 0;
187 }
188
189 static int fbdev_get_device_list(AVFormatContext *s, AVDeviceInfoList *device_list)
190 {
191 return ff_fbdev_get_device_list(device_list);
192 }
193
194 #define OFFSET(x) offsetof(FBDevContext, x)
195 #define ENC AV_OPT_FLAG_ENCODING_PARAM
196 static const AVOption options[] = {
197 { "xoffset", "set x coordinate of top left corner", OFFSET(xoffset), AV_OPT_TYPE_INT, {.i64 = 0}, INT_MIN, INT_MAX, ENC },
198 { "yoffset", "set y coordinate of top left corner", OFFSET(yoffset), AV_OPT_TYPE_INT, {.i64 = 0}, INT_MIN, INT_MAX, ENC },
199 { NULL }
200 };
201
202 static const AVClass fbdev_class = {
203 .class_name = "fbdev outdev",
204 .item_name = av_default_item_name,
205 .option = options,
206 .version = LIBAVUTIL_VERSION_INT,
207 .category = AV_CLASS_CATEGORY_DEVICE_VIDEO_OUTPUT,
208 };
209
210 const FFOutputFormat ff_fbdev_muxer = {
211 .p.name = "fbdev",
212 .p.long_name = NULL_IF_CONFIG_SMALL("Linux framebuffer"),
213 .priv_data_size = sizeof(FBDevContext),
214 .p.audio_codec = AV_CODEC_ID_NONE,
215 .p.video_codec = AV_CODEC_ID_RAWVIDEO,
216 .write_header = fbdev_write_header,
217 .write_packet = fbdev_write_packet,
218 .write_trailer = fbdev_write_trailer,
219 .get_device_list = fbdev_get_device_list,
220 .p.flags = AVFMT_NOFILE | AVFMT_VARIABLE_FPS | AVFMT_NOTIMESTAMPS,
221 .p.priv_class = &fbdev_class,
222 };
223