blob: b4e5f849759ff34452376740a2f8522cb5bcf3a4
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/pixdesc.h" |
27 | #include "libavutil/log.h" |
28 | #include "libavutil/mem.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->filename[0]) |
57 | device = h->filename; |
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 | uint8_t *pin, *pout; |
105 | enum AVPixelFormat fb_pix_fmt; |
106 | int disp_height; |
107 | int bytes_to_copy; |
108 | AVCodecParameters *par = h->streams[0]->codecpar; |
109 | enum AVPixelFormat video_pix_fmt = par->format; |
110 | int video_width = par->width; |
111 | int video_height = par->height; |
112 | int bytes_per_pixel = ((par->bits_per_coded_sample + 7) >> 3); |
113 | int src_line_size = video_width * bytes_per_pixel; |
114 | int i; |
115 | |
116 | if (ioctl(fbdev->fd, FBIOGET_VSCREENINFO, &fbdev->varinfo) < 0) |
117 | av_log(h, AV_LOG_WARNING, |
118 | "Error refreshing variable info: %s\n", av_err2str(AVERROR(errno))); |
119 | |
120 | fb_pix_fmt = ff_get_pixfmt_from_fb_varinfo(&fbdev->varinfo); |
121 | |
122 | if (fb_pix_fmt != video_pix_fmt) { |
123 | av_log(h, AV_LOG_ERROR, "Pixel format %s is not supported, use %s\n", |
124 | av_get_pix_fmt_name(video_pix_fmt), av_get_pix_fmt_name(fb_pix_fmt)); |
125 | return AVERROR(EINVAL); |
126 | } |
127 | |
128 | disp_height = FFMIN(fbdev->varinfo.yres, video_height); |
129 | bytes_to_copy = FFMIN(fbdev->varinfo.xres, video_width) * bytes_per_pixel; |
130 | |
131 | pin = pkt->data; |
132 | pout = fbdev->data + |
133 | bytes_per_pixel * fbdev->varinfo.xoffset + |
134 | fbdev->varinfo.yoffset * fbdev->fixinfo.line_length; |
135 | |
136 | if (fbdev->xoffset) { |
137 | if (fbdev->xoffset < 0) { |
138 | if (-fbdev->xoffset >= video_width) //nothing to display |
139 | return 0; |
140 | bytes_to_copy += fbdev->xoffset * bytes_per_pixel; |
141 | pin -= fbdev->xoffset * bytes_per_pixel; |
142 | } else { |
143 | int diff = (video_width + fbdev->xoffset) - fbdev->varinfo.xres; |
144 | if (diff > 0) { |
145 | if (diff >= video_width) //nothing to display |
146 | return 0; |
147 | bytes_to_copy -= diff * bytes_per_pixel; |
148 | } |
149 | pout += bytes_per_pixel * fbdev->xoffset; |
150 | } |
151 | } |
152 | |
153 | if (fbdev->yoffset) { |
154 | if (fbdev->yoffset < 0) { |
155 | if (-fbdev->yoffset >= video_height) //nothing to display |
156 | return 0; |
157 | disp_height += fbdev->yoffset; |
158 | pin -= fbdev->yoffset * src_line_size; |
159 | } else { |
160 | int diff = (video_height + fbdev->yoffset) - fbdev->varinfo.yres; |
161 | if (diff > 0) { |
162 | if (diff >= video_height) //nothing to display |
163 | return 0; |
164 | disp_height -= diff; |
165 | } |
166 | pout += fbdev->yoffset * fbdev->fixinfo.line_length; |
167 | } |
168 | } |
169 | |
170 | for (i = 0; i < disp_height; i++) { |
171 | memcpy(pout, pin, bytes_to_copy); |
172 | pout += fbdev->fixinfo.line_length; |
173 | pin += src_line_size; |
174 | } |
175 | |
176 | return 0; |
177 | } |
178 | |
179 | static av_cold int fbdev_write_trailer(AVFormatContext *h) |
180 | { |
181 | FBDevContext *fbdev = h->priv_data; |
182 | munmap(fbdev->data, fbdev->fixinfo.smem_len); |
183 | close(fbdev->fd); |
184 | return 0; |
185 | } |
186 | |
187 | static int fbdev_get_device_list(AVFormatContext *s, AVDeviceInfoList *device_list) |
188 | { |
189 | return ff_fbdev_get_device_list(device_list); |
190 | } |
191 | |
192 | #define OFFSET(x) offsetof(FBDevContext, x) |
193 | #define ENC AV_OPT_FLAG_ENCODING_PARAM |
194 | static const AVOption options[] = { |
195 | { "xoffset", "set x coordinate of top left corner", OFFSET(xoffset), AV_OPT_TYPE_INT, {.i64 = 0}, INT_MIN, INT_MAX, ENC }, |
196 | { "yoffset", "set y coordinate of top left corner", OFFSET(yoffset), AV_OPT_TYPE_INT, {.i64 = 0}, INT_MIN, INT_MAX, ENC }, |
197 | { NULL } |
198 | }; |
199 | |
200 | static const AVClass fbdev_class = { |
201 | .class_name = "fbdev outdev", |
202 | .item_name = av_default_item_name, |
203 | .option = options, |
204 | .version = LIBAVUTIL_VERSION_INT, |
205 | .category = AV_CLASS_CATEGORY_DEVICE_VIDEO_OUTPUT, |
206 | }; |
207 | |
208 | AVOutputFormat ff_fbdev_muxer = { |
209 | .name = "fbdev", |
210 | .long_name = NULL_IF_CONFIG_SMALL("Linux framebuffer"), |
211 | .priv_data_size = sizeof(FBDevContext), |
212 | .audio_codec = AV_CODEC_ID_NONE, |
213 | .video_codec = AV_CODEC_ID_RAWVIDEO, |
214 | .write_header = fbdev_write_header, |
215 | .write_packet = fbdev_write_packet, |
216 | .write_trailer = fbdev_write_trailer, |
217 | .get_device_list = fbdev_get_device_list, |
218 | .flags = AVFMT_NOFILE | AVFMT_VARIABLE_FPS | AVFMT_NOTIMESTAMPS, |
219 | .priv_class = &fbdev_class, |
220 | }; |
221 |