path: root/libavformat/rawdec.c (plain)
blob: 876a6e6a7532a21ff9bf1596eaa54b388c215562

1	/*
2	* RAW demuxers
3	* Copyright (c) 2001 Fabrice Bellard
4	* Copyright (c) 2005 Alex Beregszaszi
5	*
6	* This file is part of FFmpeg.
7	*
8	* FFmpeg is free software; you can redistribute it and/or
9	* modify it under the terms of the GNU Lesser General Public
10	* License as published by the Free Software Foundation; either
11	* version 2.1 of the License, or (at your option) any later version.
12	*
13	* FFmpeg is distributed in the hope that it will be useful,
14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16	* Lesser General Public License for more details.
17	*
18	* You should have received a copy of the GNU Lesser General Public
19	* License along with FFmpeg; if not, write to the Free Software
20	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21	*/
22
23	#include "avformat.h"
24	#include "internal.h"
25	#include "avio_internal.h"
26	#include "rawdec.h"
27	#include "libavutil/opt.h"
28	#include "libavutil/parseutils.h"
29	#include "libavutil/pixdesc.h"
30	#include "libavutil/avassert.h"
31	#include "libavutil/intreadwrite.h"
32
33	#define RAW_PACKET_SIZE 1024
34
35	int ff_raw_read_partial_packet(AVFormatContext *s, AVPacket *pkt)
36	{
37	int ret, size;
38
39	size = RAW_PACKET_SIZE;
40
41	if (av_new_packet(pkt, size) < 0)
42	return AVERROR(ENOMEM);
43
44	pkt->pos= avio_tell(s->pb);
45	pkt->stream_index = 0;
46	ret = ffio_read_partial(s->pb, pkt->data, size);
47	if (ret < 0) {
48	av_packet_unref(pkt);
49	return ret;
50	}
51	av_shrink_packet(pkt, ret);
52	return ret;
53	}
54
55	int ff_raw_audio_read_header(AVFormatContext *s)
56	{
57	AVStream *st = avformat_new_stream(s, NULL);
58	if (!st)
59	return AVERROR(ENOMEM);
60	st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
61	st->codecpar->codec_id = s->iformat->raw_codec_id;
62	st->need_parsing = AVSTREAM_PARSE_FULL_RAW;
63	st->start_time = 0;
64	/* the parameters will be extracted from the compressed bitstream */
65
66	return 0;
67	}
68
69	/* MPEG-1/H.263 input */
70	int ff_raw_video_read_header(AVFormatContext *s)
71	{
72	AVStream *st;
73	FFRawVideoDemuxerContext *s1 = s->priv_data;
74	int ret = 0;
75
76
77	st = avformat_new_stream(s, NULL);
78	if (!st) {
79	ret = AVERROR(ENOMEM);
80	goto fail;
81	}
82
83	st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
84	st->codecpar->codec_id = s->iformat->raw_codec_id;
85	st->need_parsing = AVSTREAM_PARSE_FULL_RAW;
86
87	st->internal->avctx->framerate = s1->framerate;
88	avpriv_set_pts_info(st, 64, 1, 1200000);
89
90	fail:
91	return ret;
92	}
93
94	int ff_raw_data_read_header(AVFormatContext *s)
95	{
96	AVStream *st = avformat_new_stream(s, NULL);
97	if (!st)
98	return AVERROR(ENOMEM);
99	st->codecpar->codec_type = AVMEDIA_TYPE_DATA;
100	st->codecpar->codec_id = s->iformat->raw_codec_id;
101	st->start_time = 0;
102	return 0;
103	}
104
105	/* Note: Do not forget to add new entries to the Makefile as well. */
106
107	#define OFFSET(x) offsetof(FFRawVideoDemuxerContext, x)
108	#define DEC AV_OPT_FLAG_DECODING_PARAM
109	const AVOption ff_rawvideo_options[] = {
110	{ "framerate", "", OFFSET(framerate), AV_OPT_TYPE_VIDEO_RATE, {.str = "25"}, 0, INT_MAX, DEC},
111	{ NULL },
112	};
113
114	#if CONFIG_DATA_DEMUXER
115	AVInputFormat ff_data_demuxer = {
116	.name = "data",
117	.long_name = NULL_IF_CONFIG_SMALL("raw data"),
118	.read_header = ff_raw_data_read_header,
119	.read_packet = ff_raw_read_partial_packet,
120	.raw_codec_id = AV_CODEC_ID_NONE,
121	.flags = AVFMT_NOTIMESTAMPS,
122	};
123	#endif
124
125	#if CONFIG_MJPEG_DEMUXER
126	static int mjpeg_probe(AVProbeData *p)
127	{
128	int i;
129	int state = -1;
130	int nb_invalid = 0;
131	int nb_frames = 0;
132
133	for (i=0; i<p->buf_size-2; i++) {
134	int c;
135	if (p->buf[i] != 0xFF)
136	continue;
137	c = p->buf[i+1];
138	switch (c) {
139	case 0xD8:
140	state = 0xD8;
141	break;
142	case 0xC0:
143	case 0xC1:
144	case 0xC2:
145	case 0xC3:
146	case 0xC5:
147	case 0xC6:
148	case 0xC7:
149	case 0xF7:
150	if (state == 0xD8) {
151	state = 0xC0;
152	} else
153	nb_invalid++;
154	break;
155	case 0xDA:
156	if (state == 0xC0) {
157	state = 0xDA;
158	} else
159	nb_invalid++;
160	break;
161	case 0xD9:
162	if (state == 0xDA) {
163	state = 0xD9;
164	nb_frames++;
165	} else
166	nb_invalid++;
167	break;
168	default:
169	if ( (c >= 0x02 && c <= 0xBF)
170	|| c == 0xC8) {
171	nb_invalid++;
172	}
173	}
174	}
175
176	if (nb_invalid*4 + 1 < nb_frames) {
177	static const char ct_jpeg[] = "\r\nContent-Type: image/jpeg\r\n";
178	int i;
179
180	for (i=0; i<FFMIN(p->buf_size - (int)sizeof(ct_jpeg), 100); i++)
181	if (!memcmp(p->buf + i, ct_jpeg, sizeof(ct_jpeg) - 1))
182	return AVPROBE_SCORE_EXTENSION;
183
184	if (nb_invalid == 0 && nb_frames > 2)
185	return AVPROBE_SCORE_EXTENSION / 2;
186	return AVPROBE_SCORE_EXTENSION / 4;
187	}
188
189	return 0;
190	}
191
192	FF_DEF_RAWVIDEO_DEMUXER2(mjpeg, "raw MJPEG video", mjpeg_probe, "mjpg,mjpeg,mpo", AV_CODEC_ID_MJPEG, AVFMT_GENERIC_INDEX|AVFMT_NOTIMESTAMPS)
193	#endif
194