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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. */ | |
33 | } RawVideoDemuxerContext; | |
34 | ||
35 | ||
36 | static 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 | ||
68 | static 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 | |
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 | ||
98 | static 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 | ||
105 | AVInputFormat 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 | }; |