2 * Copyright (c) 2013 Lukasz Marek
4 * This file is part of FFmpeg.
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.
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.
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
23 #include <sys/ioctl.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"
34 AVClass *class; ///< class for private options
35 int xoffset; ///< x coordinate of top left corner
36 int yoffset; ///< y coordinate of top left corner
37 struct fb_var_screeninfo varinfo; ///< framebuffer variable info
38 struct fb_fix_screeninfo fixinfo; ///< framebuffer fixed info
39 int fd; ///< framebuffer device file descriptor
40 uint8_t *data; ///< framebuffer data
43 static av_cold int fbdev_write_header(AVFormatContext *h)
45 FBDevContext *fbdev = h->priv_data;
46 enum AVPixelFormat pix_fmt;
47 int ret, flags = O_RDWR;
50 if (h->nb_streams != 1 || h->streams[0]->codec->codec_type != AVMEDIA_TYPE_VIDEO) {
51 av_log(fbdev, AV_LOG_ERROR, "Only a single video stream is supported.\n");
52 return AVERROR(EINVAL);
58 device = ff_fbdev_default_device();
60 if ((fbdev->fd = avpriv_open(device, flags)) == -1) {
62 av_log(h, AV_LOG_ERROR,
63 "Could not open framebuffer device '%s': %s\n",
64 device, av_err2str(ret));
68 if (ioctl(fbdev->fd, FBIOGET_VSCREENINFO, &fbdev->varinfo) < 0) {
70 av_log(h, AV_LOG_ERROR, "FBIOGET_VSCREENINFO: %s\n", av_err2str(ret));
74 if (ioctl(fbdev->fd, FBIOGET_FSCREENINFO, &fbdev->fixinfo) < 0) {
76 av_log(h, AV_LOG_ERROR, "FBIOGET_FSCREENINFO: %s\n", av_err2str(ret));
80 pix_fmt = ff_get_pixfmt_from_fb_varinfo(&fbdev->varinfo);
81 if (pix_fmt == AV_PIX_FMT_NONE) {
82 ret = AVERROR(EINVAL);
83 av_log(h, AV_LOG_ERROR, "Framebuffer pixel format not supported.\n");
87 fbdev->data = mmap(NULL, fbdev->fixinfo.smem_len, PROT_WRITE, MAP_SHARED, fbdev->fd, 0);
88 if (fbdev->data == MAP_FAILED) {
90 av_log(h, AV_LOG_ERROR, "Error in mmap(): %s\n", av_err2str(ret));
100 static int fbdev_write_packet(AVFormatContext *h, AVPacket *pkt)
102 FBDevContext *fbdev = h->priv_data;
104 enum AVPixelFormat fb_pix_fmt;
107 AVCodecContext *codec_ctx = h->streams[0]->codec;
108 enum AVPixelFormat video_pix_fmt = codec_ctx->pix_fmt;
109 int video_width = codec_ctx->width;
110 int video_height = codec_ctx->height;
111 int bytes_per_pixel = ((codec_ctx->bits_per_coded_sample + 7) >> 3);
112 int src_line_size = video_width * bytes_per_pixel;
115 if (ioctl(fbdev->fd, FBIOGET_VSCREENINFO, &fbdev->varinfo) < 0)
116 av_log(h, AV_LOG_WARNING,
117 "Error refreshing variable info: %s\n", av_err2str(AVERROR(errno)));
119 fb_pix_fmt = ff_get_pixfmt_from_fb_varinfo(&fbdev->varinfo);
121 if (fb_pix_fmt != video_pix_fmt) {
122 av_log(h, AV_LOG_ERROR, "Pixel format %s is not supported, use %s\n",
123 av_get_pix_fmt_name(video_pix_fmt), av_get_pix_fmt_name(fb_pix_fmt));
124 return AVERROR(EINVAL);
127 disp_height = FFMIN(fbdev->varinfo.yres, video_height);
128 bytes_to_copy = FFMIN(fbdev->varinfo.xres, video_width) * bytes_per_pixel;
132 bytes_per_pixel * fbdev->varinfo.xoffset +
133 fbdev->varinfo.yoffset * fbdev->fixinfo.line_length;
135 if (fbdev->xoffset) {
136 if (fbdev->xoffset < 0) {
137 if (-fbdev->xoffset >= video_width) //nothing to display
139 bytes_to_copy += fbdev->xoffset * bytes_per_pixel;
140 pin -= fbdev->xoffset * bytes_per_pixel;
142 int diff = (video_width + fbdev->xoffset) - fbdev->varinfo.xres;
144 if (diff >= video_width) //nothing to display
146 bytes_to_copy -= diff * bytes_per_pixel;
148 pout += bytes_per_pixel * fbdev->xoffset;
152 if (fbdev->yoffset) {
153 if (fbdev->yoffset < 0) {
154 if (-fbdev->yoffset >= video_height) //nothing to display
156 disp_height += fbdev->yoffset;
157 pin -= fbdev->yoffset * src_line_size;
159 int diff = (video_height + fbdev->yoffset) - fbdev->varinfo.yres;
161 if (diff >= video_height) //nothing to display
165 pout += fbdev->yoffset * fbdev->fixinfo.line_length;
169 for (i = 0; i < disp_height; i++) {
170 memcpy(pout, pin, bytes_to_copy);
171 pout += fbdev->fixinfo.line_length;
172 pin += src_line_size;
178 static av_cold int fbdev_write_trailer(AVFormatContext *h)
180 FBDevContext *fbdev = h->priv_data;
181 munmap(fbdev->data, fbdev->fixinfo.smem_len);
186 #define OFFSET(x) offsetof(FBDevContext, x)
187 #define ENC AV_OPT_FLAG_ENCODING_PARAM
188 static const AVOption options[] = {
189 { "xoffset", "set x coordinate of top left corner", OFFSET(xoffset), AV_OPT_TYPE_INT, {.i64 = 0}, INT_MIN, INT_MAX, ENC },
190 { "yoffset", "set y coordinate of top left corner", OFFSET(yoffset), AV_OPT_TYPE_INT, {.i64 = 0}, INT_MIN, INT_MAX, ENC },
194 static const AVClass fbdev_class = {
195 .class_name = "fbdev outdev",
196 .item_name = av_default_item_name,
198 .version = LIBAVUTIL_VERSION_INT,
201 AVOutputFormat ff_fbdev_muxer = {
203 .long_name = NULL_IF_CONFIG_SMALL("Linux framebuffer"),
204 .priv_data_size = sizeof(FBDevContext),
205 .audio_codec = AV_CODEC_ID_NONE,
206 .video_codec = AV_CODEC_ID_RAWVIDEO,
207 .write_header = fbdev_write_header,
208 .write_packet = fbdev_write_packet,
209 .write_trailer = fbdev_write_trailer,
210 .flags = AVFMT_NOFILE | AVFMT_VARIABLE_FPS | AVFMT_NOTIMESTAMPS,
211 .priv_class = &fbdev_class,