path: root/libavformat/rawvideodec.c (plain)
blob: 8bde22c4e93de5aed7094e454d5ad842c2503482

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/imgutils.h"
23	#include "libavutil/parseutils.h"
24	#include "libavutil/pixdesc.h"
25	#include "libavutil/opt.h"
26	#include "internal.h"
27	#include "avformat.h"
28
29	typedef struct RawVideoDemuxerContext {
30	const AVClass *class; /**< Class for private options. */
31	int width, height; /**< Integers describing video size, set by a private option. */
32	char *pixel_format; /**< Set by a private option. */
33	AVRational framerate; /**< AVRational describing framerate, set by a private option. */
34	} RawVideoDemuxerContext;
35
36
37	static int rawvideo_read_header(AVFormatContext *ctx)
38	{
39	RawVideoDemuxerContext *s = ctx->priv_data;
40	enum AVPixelFormat pix_fmt;
41	AVStream *st;
42	int packet_size;
43
44	st = avformat_new_stream(ctx, NULL);
45	if (!st)
46	return AVERROR(ENOMEM);
47
48	st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
49
50	st->codecpar->codec_id = ctx->iformat->raw_codec_id;
51
52	if ((pix_fmt = av_get_pix_fmt(s->pixel_format)) == AV_PIX_FMT_NONE) {
53	av_log(ctx, AV_LOG_ERROR, "No such pixel format: %s.\n",
54	s->pixel_format);
55	return AVERROR(EINVAL);
56	}
57
58	avpriv_set_pts_info(st, 64, s->framerate.den, s->framerate.num);
59
60	st->codecpar->width = s->width;
61	st->codecpar->height = s->height;
62	st->codecpar->format = pix_fmt;
63	packet_size = av_image_get_buffer_size(st->codecpar->format, s->width, s->height, 1);
64	if (packet_size < 0)
65	return packet_size;
66	ctx->packet_size = packet_size;
67	st->codecpar->bit_rate = av_rescale_q(ctx->packet_size,
68	(AVRational){8,1}, st->time_base);
69
70	return 0;
71	}
72
73
74	static int rawvideo_read_packet(AVFormatContext *s, AVPacket *pkt)
75	{
76	int ret;
77
78	ret = av_get_packet(s->pb, pkt, s->packet_size);
79	pkt->pts = pkt->dts = pkt->pos / s->packet_size;
80
81	pkt->stream_index = 0;
82	if (ret < 0)
83	return ret;
84	return 0;
85	}
86
87	#define OFFSET(x) offsetof(RawVideoDemuxerContext, x)
88	#define DEC AV_OPT_FLAG_DECODING_PARAM
89	static const AVOption rawvideo_options[] = {
90	{ "video_size", "set frame size", OFFSET(width), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, 0, 0, DEC },
91	{ "pixel_format", "set pixel format", OFFSET(pixel_format), AV_OPT_TYPE_STRING, {.str = "yuv420p"}, 0, 0, DEC },
92	{ "framerate", "set frame rate", OFFSET(framerate), AV_OPT_TYPE_VIDEO_RATE, {.str = "25"}, 0, INT_MAX, DEC },
93	{ NULL },
94	};
95
96	static const AVClass rawvideo_demuxer_class = {
97	.class_name = "rawvideo demuxer",
98	.item_name = av_default_item_name,
99	.option = rawvideo_options,
100	.version = LIBAVUTIL_VERSION_INT,
101	};
102
103	AVInputFormat ff_rawvideo_demuxer = {
104	.name = "rawvideo",
105	.long_name = NULL_IF_CONFIG_SMALL("raw video"),
106	.priv_data_size = sizeof(RawVideoDemuxerContext),
107	.read_header = rawvideo_read_header,
108	.read_packet = rawvideo_read_packet,
109	.flags = AVFMT_GENERIC_INDEX,
110	.extensions = "yuv,cif,qcif,rgb",
111	.raw_codec_id = AV_CODEC_ID_RAWVIDEO,
112	.priv_class = &rawvideo_demuxer_class,
113	};
114