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6147 | serge | 1 | /* |
2 | * Copyright (c) 2013 Clément Bœsch |
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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 "v4l2-common.h" |
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22 | #include "avdevice.h" |
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23 | |||
24 | typedef struct { |
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25 | AVClass *class; |
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26 | int fd; |
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27 | } V4L2Context; |
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28 | |||
29 | static av_cold int write_header(AVFormatContext *s1) |
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30 | { |
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31 | int res = 0, flags = O_RDWR; |
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32 | struct v4l2_format fmt = { |
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33 | .type = V4L2_BUF_TYPE_VIDEO_OUTPUT |
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34 | }; |
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35 | V4L2Context *s = s1->priv_data; |
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36 | AVCodecContext *enc_ctx; |
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37 | uint32_t v4l2_pixfmt; |
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38 | |||
39 | if (s1->flags & AVFMT_FLAG_NONBLOCK) |
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40 | flags |= O_NONBLOCK; |
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41 | |||
42 | s->fd = open(s1->filename, flags); |
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43 | if (s->fd < 0) { |
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44 | res = AVERROR(errno); |
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45 | av_log(s1, AV_LOG_ERROR, "Unable to open V4L2 device '%s'\n", s1->filename); |
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46 | return res; |
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47 | } |
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48 | |||
49 | if (s1->nb_streams != 1 || |
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50 | s1->streams[0]->codec->codec_type != AVMEDIA_TYPE_VIDEO || |
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51 | s1->streams[0]->codec->codec_id != AV_CODEC_ID_RAWVIDEO) { |
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52 | av_log(s1, AV_LOG_ERROR, |
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53 | "V4L2 output device supports only a single raw video stream\n"); |
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54 | return AVERROR(EINVAL); |
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55 | } |
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56 | |||
57 | enc_ctx = s1->streams[0]->codec; |
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58 | |||
59 | v4l2_pixfmt = ff_fmt_ff2v4l(enc_ctx->pix_fmt, AV_CODEC_ID_RAWVIDEO); |
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60 | if (!v4l2_pixfmt) { // XXX: try to force them one by one? |
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61 | av_log(s1, AV_LOG_ERROR, "Unknown V4L2 pixel format equivalent for %s\n", |
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62 | av_get_pix_fmt_name(enc_ctx->pix_fmt)); |
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63 | return AVERROR(EINVAL); |
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64 | } |
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65 | |||
66 | if (ioctl(s->fd, VIDIOC_G_FMT, &fmt) < 0) { |
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67 | res = AVERROR(errno); |
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68 | av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_G_FMT): %s\n", av_err2str(res)); |
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69 | return res; |
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70 | } |
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71 | |||
72 | fmt.fmt.pix.width = enc_ctx->width; |
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73 | fmt.fmt.pix.height = enc_ctx->height; |
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74 | fmt.fmt.pix.pixelformat = v4l2_pixfmt; |
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75 | fmt.fmt.pix.sizeimage = av_image_get_buffer_size(enc_ctx->pix_fmt, enc_ctx->width, enc_ctx->height, 1); |
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76 | |||
77 | if (ioctl(s->fd, VIDIOC_S_FMT, &fmt) < 0) { |
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78 | res = AVERROR(errno); |
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79 | av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_S_FMT): %s\n", av_err2str(res)); |
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80 | return res; |
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81 | } |
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82 | |||
83 | return res; |
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84 | } |
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85 | |||
86 | static int write_packet(AVFormatContext *s1, AVPacket *pkt) |
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87 | { |
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88 | const V4L2Context *s = s1->priv_data; |
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89 | if (write(s->fd, pkt->data, pkt->size) == -1) |
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90 | return AVERROR(errno); |
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91 | return 0; |
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92 | } |
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93 | |||
94 | static int write_trailer(AVFormatContext *s1) |
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95 | { |
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96 | const V4L2Context *s = s1->priv_data; |
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97 | close(s->fd); |
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98 | return 0; |
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99 | } |
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100 | |||
101 | static const AVClass v4l2_class = { |
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102 | .class_name = "V4L2 outdev", |
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103 | .item_name = av_default_item_name, |
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104 | .version = LIBAVUTIL_VERSION_INT, |
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105 | .category = AV_CLASS_CATEGORY_DEVICE_VIDEO_OUTPUT, |
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106 | }; |
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107 | |||
108 | AVOutputFormat ff_v4l2_muxer = { |
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109 | .name = "v4l2", |
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110 | .long_name = NULL_IF_CONFIG_SMALL("Video4Linux2 output device"), |
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111 | .priv_data_size = sizeof(V4L2Context), |
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112 | .audio_codec = AV_CODEC_ID_NONE, |
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113 | .video_codec = AV_CODEC_ID_RAWVIDEO, |
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114 | .write_header = write_header, |
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115 | .write_packet = write_packet, |
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116 | .write_trailer = write_trailer, |
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117 | .flags = AVFMT_NOFILE, |
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118 | .priv_class = &v4l2_class, |
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119 | };>>> |