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6147 | serge | 1 | /* |
2 | * Copyright (c) 2013 Lukasz Marek |
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3 | * |
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4 | * This file is part of FFmpeg. |
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5 | * |
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6 | * FFmpeg is free software; you can redistribute it and/or |
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7 | * modify it under the terms of the GNU Lesser General Public |
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8 | * License as published by the Free Software Foundation; either |
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9 | * version 2.1 of the License, or (at your option) any later version. |
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10 | * |
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11 | * FFmpeg is distributed in the hope that it will be useful, |
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12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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14 | * Lesser General Public License for more details. |
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15 | * |
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16 | * You should have received a copy of the GNU Lesser General Public |
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17 | * License along with FFmpeg; if not, write to the Free Software |
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18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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19 | */ |
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20 | |||
21 | #include |
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22 | #include |
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23 | #include |
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24 | #include |
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25 | #include |
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26 | #include "libavutil/pixdesc.h" |
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27 | #include "libavutil/log.h" |
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28 | #include "libavutil/mem.h" |
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29 | #include "libavutil/opt.h" |
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30 | #include "libavformat/avformat.h" |
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31 | #include "fbdev_common.h" |
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32 | #include "avdevice.h" |
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33 | |||
34 | typedef struct { |
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35 | AVClass *class; ///< class for private options |
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36 | int xoffset; ///< x coordinate of top left corner |
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37 | int yoffset; ///< y coordinate of top left corner |
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38 | struct fb_var_screeninfo varinfo; ///< framebuffer variable info |
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39 | struct fb_fix_screeninfo fixinfo; ///< framebuffer fixed info |
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40 | int fd; ///< framebuffer device file descriptor |
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41 | uint8_t *data; ///< framebuffer data |
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42 | } FBDevContext; |
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43 | |||
44 | static av_cold int fbdev_write_header(AVFormatContext *h) |
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45 | { |
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46 | FBDevContext *fbdev = h->priv_data; |
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47 | enum AVPixelFormat pix_fmt; |
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48 | int ret, flags = O_RDWR; |
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49 | const char* device; |
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50 | |||
51 | if (h->nb_streams != 1 || h->streams[0]->codec->codec_type != AVMEDIA_TYPE_VIDEO) { |
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52 | av_log(fbdev, AV_LOG_ERROR, "Only a single video stream is supported.\n"); |
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53 | return AVERROR(EINVAL); |
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54 | } |
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55 | |||
56 | if (h->filename[0]) |
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57 | device = h->filename; |
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58 | else |
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59 | device = ff_fbdev_default_device(); |
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60 | |||
61 | if ((fbdev->fd = avpriv_open(device, flags)) == -1) { |
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62 | ret = AVERROR(errno); |
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63 | av_log(h, AV_LOG_ERROR, |
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64 | "Could not open framebuffer device '%s': %s\n", |
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65 | device, av_err2str(ret)); |
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66 | return ret; |
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67 | } |
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68 | |||
69 | if (ioctl(fbdev->fd, FBIOGET_VSCREENINFO, &fbdev->varinfo) < 0) { |
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70 | ret = AVERROR(errno); |
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71 | av_log(h, AV_LOG_ERROR, "FBIOGET_VSCREENINFO: %s\n", av_err2str(ret)); |
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72 | goto fail; |
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73 | } |
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74 | |||
75 | if (ioctl(fbdev->fd, FBIOGET_FSCREENINFO, &fbdev->fixinfo) < 0) { |
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76 | ret = AVERROR(errno); |
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77 | av_log(h, AV_LOG_ERROR, "FBIOGET_FSCREENINFO: %s\n", av_err2str(ret)); |
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78 | goto fail; |
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79 | } |
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80 | |||
81 | pix_fmt = ff_get_pixfmt_from_fb_varinfo(&fbdev->varinfo); |
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82 | if (pix_fmt == AV_PIX_FMT_NONE) { |
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83 | ret = AVERROR(EINVAL); |
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84 | av_log(h, AV_LOG_ERROR, "Framebuffer pixel format not supported.\n"); |
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85 | goto fail; |
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86 | } |
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87 | |||
88 | fbdev->data = mmap(NULL, fbdev->fixinfo.smem_len, PROT_WRITE, MAP_SHARED, fbdev->fd, 0); |
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89 | if (fbdev->data == MAP_FAILED) { |
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90 | ret = AVERROR(errno); |
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91 | av_log(h, AV_LOG_ERROR, "Error in mmap(): %s\n", av_err2str(ret)); |
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92 | goto fail; |
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93 | } |
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94 | |||
95 | return 0; |
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96 | fail: |
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97 | close(fbdev->fd); |
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98 | return ret; |
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99 | } |
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100 | |||
101 | static int fbdev_write_packet(AVFormatContext *h, AVPacket *pkt) |
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102 | { |
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103 | FBDevContext *fbdev = h->priv_data; |
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104 | uint8_t *pin, *pout; |
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105 | enum AVPixelFormat fb_pix_fmt; |
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106 | int disp_height; |
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107 | int bytes_to_copy; |
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108 | AVCodecContext *codec_ctx = h->streams[0]->codec; |
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109 | enum AVPixelFormat video_pix_fmt = codec_ctx->pix_fmt; |
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110 | int video_width = codec_ctx->width; |
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111 | int video_height = codec_ctx->height; |
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112 | int bytes_per_pixel = ((codec_ctx->bits_per_coded_sample + 7) >> 3); |
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113 | int src_line_size = video_width * bytes_per_pixel; |
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114 | int i; |
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115 | |||
116 | if (ioctl(fbdev->fd, FBIOGET_VSCREENINFO, &fbdev->varinfo) < 0) |
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117 | av_log(h, AV_LOG_WARNING, |
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118 | "Error refreshing variable info: %s\n", av_err2str(AVERROR(errno))); |
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119 | |||
120 | fb_pix_fmt = ff_get_pixfmt_from_fb_varinfo(&fbdev->varinfo); |
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121 | |||
122 | if (fb_pix_fmt != video_pix_fmt) { |
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123 | av_log(h, AV_LOG_ERROR, "Pixel format %s is not supported, use %s\n", |
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124 | av_get_pix_fmt_name(video_pix_fmt), av_get_pix_fmt_name(fb_pix_fmt)); |
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125 | return AVERROR(EINVAL); |
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126 | } |
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127 | |||
128 | disp_height = FFMIN(fbdev->varinfo.yres, video_height); |
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129 | bytes_to_copy = FFMIN(fbdev->varinfo.xres, video_width) * bytes_per_pixel; |
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130 | |||
131 | pin = pkt->data; |
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132 | pout = fbdev->data + |
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133 | bytes_per_pixel * fbdev->varinfo.xoffset + |
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134 | fbdev->varinfo.yoffset * fbdev->fixinfo.line_length; |
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135 | |||
136 | if (fbdev->xoffset) { |
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137 | if (fbdev->xoffset < 0) { |
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138 | if (-fbdev->xoffset >= video_width) //nothing to display |
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139 | return 0; |
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140 | bytes_to_copy += fbdev->xoffset * bytes_per_pixel; |
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141 | pin -= fbdev->xoffset * bytes_per_pixel; |
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142 | } else { |
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143 | int diff = (video_width + fbdev->xoffset) - fbdev->varinfo.xres; |
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144 | if (diff > 0) { |
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145 | if (diff >= video_width) //nothing to display |
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146 | return 0; |
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147 | bytes_to_copy -= diff * bytes_per_pixel; |
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148 | } |
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149 | pout += bytes_per_pixel * fbdev->xoffset; |
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150 | } |
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151 | } |
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152 | |||
153 | if (fbdev->yoffset) { |
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154 | if (fbdev->yoffset < 0) { |
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155 | if (-fbdev->yoffset >= video_height) //nothing to display |
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156 | return 0; |
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157 | disp_height += fbdev->yoffset; |
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158 | pin -= fbdev->yoffset * src_line_size; |
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159 | } else { |
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160 | int diff = (video_height + fbdev->yoffset) - fbdev->varinfo.yres; |
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161 | if (diff > 0) { |
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162 | if (diff >= video_height) //nothing to display |
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163 | return 0; |
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164 | disp_height -= diff; |
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165 | } |
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166 | pout += fbdev->yoffset * fbdev->fixinfo.line_length; |
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167 | } |
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168 | } |
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169 | |||
170 | for (i = 0; i < disp_height; i++) { |
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171 | memcpy(pout, pin, bytes_to_copy); |
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172 | pout += fbdev->fixinfo.line_length; |
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173 | pin += src_line_size; |
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174 | } |
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175 | |||
176 | return 0; |
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177 | } |
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178 | |||
179 | static av_cold int fbdev_write_trailer(AVFormatContext *h) |
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180 | { |
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181 | FBDevContext *fbdev = h->priv_data; |
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182 | munmap(fbdev->data, fbdev->fixinfo.smem_len); |
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183 | close(fbdev->fd); |
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184 | return 0; |
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185 | } |
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186 | |||
187 | static int fbdev_get_device_list(AVFormatContext *s, AVDeviceInfoList *device_list) |
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188 | { |
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189 | return ff_fbdev_get_device_list(device_list); |
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190 | } |
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191 | |||
192 | #define OFFSET(x) offsetof(FBDevContext, x) |
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193 | #define ENC AV_OPT_FLAG_ENCODING_PARAM |
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194 | static const AVOption options[] = { |
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195 | { "xoffset", "set x coordinate of top left corner", OFFSET(xoffset), AV_OPT_TYPE_INT, {.i64 = 0}, INT_MIN, INT_MAX, ENC }, |
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196 | { "yoffset", "set y coordinate of top left corner", OFFSET(yoffset), AV_OPT_TYPE_INT, {.i64 = 0}, INT_MIN, INT_MAX, ENC }, |
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197 | { NULL } |
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198 | }; |
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199 | |||
200 | static const AVClass fbdev_class = { |
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201 | .class_name = "fbdev outdev", |
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202 | .item_name = av_default_item_name, |
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203 | .option = options, |
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204 | .version = LIBAVUTIL_VERSION_INT, |
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205 | .category = AV_CLASS_CATEGORY_DEVICE_VIDEO_OUTPUT, |
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206 | }; |
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207 | |||
208 | AVOutputFormat ff_fbdev_muxer = { |
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209 | .name = "fbdev", |
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210 | .long_name = NULL_IF_CONFIG_SMALL("Linux framebuffer"), |
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211 | .priv_data_size = sizeof(FBDevContext), |
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212 | .audio_codec = AV_CODEC_ID_NONE, |
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213 | .video_codec = AV_CODEC_ID_RAWVIDEO, |
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214 | .write_header = fbdev_write_header, |
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215 | .write_packet = fbdev_write_packet, |
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216 | .write_trailer = fbdev_write_trailer, |
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217 | .get_device_list = fbdev_get_device_list, |
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218 | .flags = AVFMT_NOFILE | AVFMT_VARIABLE_FPS | AVFMT_NOTIMESTAMPS, |
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219 | .priv_class = &fbdev_class, |
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220 | };>>>>>>>>>>>>> |