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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]->codec->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 | AVCodecContext *codec_ctx = h->streams[0]->codec; | |
109 | enum AVPixelFormat video_pix_fmt = codec_ctx->pix_fmt; | |
110 | int video_width = codec_ctx->width; | |
111 | int video_height = codec_ctx->height; | |
112 | int bytes_per_pixel = ((codec_ctx->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 | }; |