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
28typedef 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. */
33} RawVideoDemuxerContext;
34
35
36static int rawvideo_read_header(AVFormatContext *ctx)
37{
38    RawVideoDemuxerContext *s = ctx->priv_data;
39    enum AVPixelFormat pix_fmt;
40    AVStream *st;
41
42    st = avformat_new_stream(ctx, NULL);
43    if (!st)
44        return AVERROR(ENOMEM);
45
46    st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
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
56    avpriv_set_pts_info(st, 64, s->framerate.den, s->framerate.num);
57
58    st->codec->width  = s->width;
59    st->codec->height = s->height;
60    st->codec->pix_fmt = pix_fmt;
61    st->codec->bit_rate = av_rescale_q(avpicture_get_size(st->codec->pix_fmt, s->width, s->height),
62                                       (AVRational){8,1}, st->time_base);
63
64    return 0;
65}
66
67
68static int rawvideo_read_packet(AVFormatContext *s, AVPacket *pkt)
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
91static 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
98static const AVClass rawvideo_demuxer_class = {
99    .class_name = "rawvideo demuxer",
100    .item_name  = av_default_item_name,
101    .option     = rawvideo_options,
102    .version    = LIBAVUTIL_VERSION_INT,
103};
104
105AVInputFormat ff_rawvideo_demuxer = {
106    .name           = "rawvideo",
107    .long_name      = NULL_IF_CONFIG_SMALL("raw video"),
108    .priv_data_size = sizeof(RawVideoDemuxerContext),
109    .read_header    = rawvideo_read_header,
110    .read_packet    = rawvideo_read_packet,
111    .flags          = AVFMT_GENERIC_INDEX,
112    .extensions     = "yuv,cif,qcif,rgb",
113    .raw_codec_id   = AV_CODEC_ID_RAWVIDEO,
114    .priv_class     = &rawvideo_demuxer_class,
115};
116