| 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 | }; |