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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4349 | 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 | int fd; |
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| 26 | } V4L2Context; |
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| 27 | |||
| 28 | static av_cold int write_header(AVFormatContext *s1) |
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| 29 | { |
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| 30 | int res = 0, flags = O_RDWR; |
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| 31 | struct v4l2_format fmt = { |
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| 32 | .type = V4L2_BUF_TYPE_VIDEO_OUTPUT |
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| 33 | }; |
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| 34 | V4L2Context *s = s1->priv_data; |
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| 35 | AVCodecContext *enc_ctx; |
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| 36 | uint32_t v4l2_pixfmt; |
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| 37 | |||
| 38 | if (s1->flags & AVFMT_FLAG_NONBLOCK) |
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| 39 | flags |= O_NONBLOCK; |
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| 40 | |||
| 41 | s->fd = open(s1->filename, flags); |
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| 42 | if (s->fd < 0) { |
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| 43 | res = AVERROR(errno); |
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| 44 | av_log(s1, AV_LOG_ERROR, "Unable to open V4L2 device '%s'\n", s1->filename); |
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| 45 | return res; |
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| 46 | } |
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| 47 | |||
| 48 | if (s1->nb_streams != 1 || |
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| 49 | s1->streams[0]->codec->codec_type != AVMEDIA_TYPE_VIDEO || |
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| 50 | s1->streams[0]->codec->codec_id != AV_CODEC_ID_RAWVIDEO) { |
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| 51 | av_log(s1, AV_LOG_ERROR, |
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| 52 | "V4L2 output device supports only a single raw video stream\n"); |
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| 53 | return AVERROR(EINVAL); |
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| 54 | } |
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| 55 | |||
| 56 | enc_ctx = s1->streams[0]->codec; |
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| 57 | |||
| 58 | v4l2_pixfmt = avpriv_fmt_ff2v4l(enc_ctx->pix_fmt, AV_CODEC_ID_RAWVIDEO); |
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| 59 | if (!v4l2_pixfmt) { // XXX: try to force them one by one? |
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| 60 | av_log(s1, AV_LOG_ERROR, "Unknown V4L2 pixel format equivalent for %s\n", |
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| 61 | av_get_pix_fmt_name(enc_ctx->pix_fmt)); |
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| 62 | return AVERROR(EINVAL); |
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| 63 | } |
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| 64 | |||
| 65 | if (ioctl(s->fd, VIDIOC_G_FMT, &fmt) < 0) { |
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| 66 | res = AVERROR(errno); |
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| 67 | av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_G_FMT): %s\n", av_err2str(res)); |
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| 68 | return res; |
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| 69 | } |
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| 70 | |||
| 71 | fmt.fmt.pix.width = enc_ctx->width; |
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| 72 | fmt.fmt.pix.height = enc_ctx->height; |
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| 73 | fmt.fmt.pix.pixelformat = v4l2_pixfmt; |
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| 74 | fmt.fmt.pix.sizeimage = av_image_get_buffer_size(enc_ctx->pix_fmt, enc_ctx->width, enc_ctx->height, 1); |
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| 75 | |||
| 76 | if (ioctl(s->fd, VIDIOC_S_FMT, &fmt) < 0) { |
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| 77 | res = AVERROR(errno); |
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| 78 | av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_S_FMT): %s\n", av_err2str(res)); |
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| 79 | return res; |
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| 80 | } |
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| 81 | |||
| 82 | return res; |
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| 83 | } |
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| 84 | |||
| 85 | static int write_packet(AVFormatContext *s1, AVPacket *pkt) |
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| 86 | { |
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| 87 | const V4L2Context *s = s1->priv_data; |
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| 88 | if (write(s->fd, pkt->data, pkt->size) == -1) |
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| 89 | return AVERROR(errno); |
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| 90 | return 0; |
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| 91 | } |
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| 92 | |||
| 93 | static int write_trailer(AVFormatContext *s1) |
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| 94 | { |
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| 95 | const V4L2Context *s = s1->priv_data; |
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| 96 | close(s->fd); |
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| 97 | return 0; |
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| 98 | } |
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| 99 | |||
| 100 | AVOutputFormat ff_v4l2_muxer = { |
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| 101 | .name = "v4l2", |
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| 102 | .long_name = NULL_IF_CONFIG_SMALL("Video4Linux2 output device"), |
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| 103 | .priv_data_size = sizeof(V4L2Context), |
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| 104 | .audio_codec = AV_CODEC_ID_NONE, |
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| 105 | .video_codec = AV_CODEC_ID_RAWVIDEO, |
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| 106 | .write_header = write_header, |
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| 107 | .write_packet = write_packet, |
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| 108 | .write_trailer = write_trailer, |
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| 109 | .flags = AVFMT_NOFILE, |
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| 110 | }; |