path: root/libavformat/v210.c (plain)
blob: a90bd367c120f56b8e3f1359fdde71e81596e83b

1	/*
2	* Raw v210 video demuxer
3	* Copyright (c) 2015 Tiancheng "Timothy" Gu
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 V210DemuxerContext {
30	const AVClass *class; /**< Class for private options. */
31	int width, height; /**< Integers describing video size, set by a private option. */
32	AVRational framerate; /**< AVRational describing framerate, set by a private option. */
33	} V210DemuxerContext;
34
35	// v210 frame width is padded to multiples of 48
36	#define GET_PACKET_SIZE(w, h) (((w + 47) / 48) * 48 * h * 8 / 3)
37
38	static int v210_read_header(AVFormatContext *ctx)
39	{
40	V210DemuxerContext *s = ctx->priv_data;
41	AVStream *st;
42	int ret;
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	avpriv_set_pts_info(st, 64, s->framerate.den, s->framerate.num);
53
54	ret = av_image_check_size(s->width, s->height, 0, ctx);
55	if (ret < 0)
56	return ret;
57	st->codecpar->width = s->width;
58	st->codecpar->height = s->height;
59	st->codecpar->format = ctx->iformat->raw_codec_id == AV_CODEC_ID_V210 ?
60	AV_PIX_FMT_YUV422P10 : AV_PIX_FMT_YUV422P16;
61	ctx->packet_size = GET_PACKET_SIZE(s->width, s->height);
62	st->codecpar->bit_rate = av_rescale_q(ctx->packet_size,
63	(AVRational){8,1}, st->time_base);
64
65	return 0;
66	}
67
68
69	static int v210_read_packet(AVFormatContext *s, AVPacket *pkt)
70	{
71	int ret;
72
73	ret = av_get_packet(s->pb, pkt, s->packet_size);
74	pkt->pts = pkt->dts = pkt->pos / s->packet_size;
75
76	pkt->stream_index = 0;
77	if (ret < 0)
78	return ret;
79	return 0;
80	}
81
82	#define OFFSET(x) offsetof(V210DemuxerContext, x)
83	#define DEC AV_OPT_FLAG_DECODING_PARAM
84	static const AVOption v210_options[] = {
85	{ "video_size", "set frame size", OFFSET(width), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, 0, 0, DEC },
86	{ "framerate", "set frame rate", OFFSET(framerate), AV_OPT_TYPE_VIDEO_RATE, {.str = "25"}, 0, INT_MAX, DEC },
87	{ NULL },
88	};
89
90	#if CONFIG_V210_DEMUXER
91	static const AVClass v210_demuxer_class = {
92	.class_name = "v210 demuxer",
93	.item_name = av_default_item_name,
94	.option = v210_options,
95	.version = LIBAVUTIL_VERSION_INT,
96	};
97
98	AVInputFormat ff_v210_demuxer = {
99	.name = "v210",
100	.long_name = NULL_IF_CONFIG_SMALL("Uncompressed 4:2:2 10-bit"),
101	.priv_data_size = sizeof(V210DemuxerContext),
102	.read_header = v210_read_header,
103	.read_packet = v210_read_packet,
104	.flags = AVFMT_GENERIC_INDEX,
105	.extensions = "v210",
106	.raw_codec_id = AV_CODEC_ID_V210,
107	.priv_class = &v210_demuxer_class,
108	};
109	#endif // CONFIG_V210_DEMUXER
110
111	#if CONFIG_V210X_DEMUXER
112	static const AVClass v210x_demuxer_class = {
113	.class_name = "v210x demuxer",
114	.item_name = av_default_item_name,
115	.option = v210_options,
116	.version = LIBAVUTIL_VERSION_INT,
117	};
118
119	AVInputFormat ff_v210x_demuxer = {
120	.name = "v210x",
121	.long_name = NULL_IF_CONFIG_SMALL("Uncompressed 4:2:2 10-bit"),
122	.priv_data_size = sizeof(V210DemuxerContext),
123	.read_header = v210_read_header,
124	.read_packet = v210_read_packet,
125	.flags = AVFMT_GENERIC_INDEX,
126	.extensions = "yuv10",
127	.raw_codec_id = AV_CODEC_ID_V210X,
128	.priv_class = &v210x_demuxer_class,
129	};
130	#endif // CONFIG_V210X_DEMUXER
131