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rawvideodec.c
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1 /*
2  * RAW video demuxer
3  * Copyright (c) 2001 Fabrice Bellard
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 #include "libavutil/parseutils.h"
23 #include "libavutil/pixdesc.h"
24 #include "libavutil/opt.h"
25 #include "internal.h"
26 #include "avformat.h"
27 
28 typedef struct RawVideoDemuxerContext {
29  const AVClass *class; /**< Class for private options. */
30  int width, height; /**< Integers describing video size, set by a private option. */
31  char *pixel_format; /**< Set by a private option. */
32  AVRational framerate; /**< AVRational describing framerate, set by a private option. */
34 
35 
37 {
40  AVStream *st;
41 
42  st = avformat_new_stream(ctx, NULL);
43  if (!st)
44  return AVERROR(ENOMEM);
45 
47 
48  st->codec->codec_id = ctx->iformat->raw_codec_id;
49 
50  if ((pix_fmt = av_get_pix_fmt(s->pixel_format)) == AV_PIX_FMT_NONE) {
51  av_log(ctx, AV_LOG_ERROR, "No such pixel format: %s.\n",
52  s->pixel_format);
53  return AVERROR(EINVAL);
54  }
55 
57 
58  st->codec->width = s->width;
59  st->codec->height = s->height;
60  st->codec->pix_fmt = pix_fmt;
62  (AVRational){8,1}, st->time_base);
63 
64  return 0;
65 }
66 
67 
69 {
70  int packet_size, ret, width, height;
71  AVStream *st = s->streams[0];
72 
73  width = st->codec->width;
74  height = st->codec->height;
75 
76  packet_size = avpicture_get_size(st->codec->pix_fmt, width, height);
77  if (packet_size < 0)
78  return -1;
79 
80  ret = av_get_packet(s->pb, pkt, packet_size);
81  pkt->pts = pkt->dts = pkt->pos / packet_size;
82 
83  pkt->stream_index = 0;
84  if (ret < 0)
85  return ret;
86  return 0;
87 }
88 
89 #define OFFSET(x) offsetof(RawVideoDemuxerContext, x)
90 #define DEC AV_OPT_FLAG_DECODING_PARAM
91 static const AVOption rawvideo_options[] = {
92  { "video_size", "set frame size", OFFSET(width), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, 0, 0, DEC },
93  { "pixel_format", "set pixel format", OFFSET(pixel_format), AV_OPT_TYPE_STRING, {.str = "yuv420p"}, 0, 0, DEC },
94  { "framerate", "set frame rate", OFFSET(framerate), AV_OPT_TYPE_VIDEO_RATE, {.str = "25"}, 0, 0, DEC },
95  { NULL },
96 };
97 
99  .class_name = "rawvideo demuxer",
100  .item_name = av_default_item_name,
101  .option = rawvideo_options,
102  .version = LIBAVUTIL_VERSION_INT,
103 };
104 
106  .name = "rawvideo",
107  .long_name = NULL_IF_CONFIG_SMALL("raw video"),
108  .priv_data_size = sizeof(RawVideoDemuxerContext),
112  .extensions = "yuv,cif,qcif,rgb",
113  .raw_codec_id = AV_CODEC_ID_RAWVIDEO,
114  .priv_class = &rawvideo_demuxer_class,
115 };