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 34typedef 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 44static 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 101static 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 179static 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 187static 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 194static 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 200static 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 208AVOutputFormat 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