1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
|
/*
* RAW demuxers
* Copyright (c) 2001 Fabrice Bellard
* Copyright (c) 2005 Alex Beregszaszi
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "config_components.h"
#include "avformat.h"
#include "internal.h"
#include "rawdec.h"
#include "libavutil/opt.h"
#include "libavcodec/avcodec.h"
#define RAW_PACKET_SIZE 1024
int ff_raw_read_partial_packet(AVFormatContext *s, AVPacket *pkt)
{
FFRawDemuxerContext *raw = s->priv_data;
int ret, size;
size = raw->raw_packet_size;
if ((ret = av_new_packet(pkt, size)) < 0)
return ret;
pkt->pos= avio_tell(s->pb);
pkt->stream_index = 0;
ret = avio_read_partial(s->pb, pkt->data, size);
if (ret < 0) {
av_packet_unref(pkt);
return ret;
}
av_shrink_packet(pkt, ret);
return ret;
}
int ff_raw_audio_read_header(AVFormatContext *s)
{
AVStream *st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
st->codecpar->codec_id = s->iformat->raw_codec_id;
ffstream(st)->need_parsing = AVSTREAM_PARSE_FULL_RAW;
st->start_time = 0;
/* the parameters will be extracted from the compressed bitstream */
return 0;
}
/* MPEG-1/H.263 input */
int ff_raw_video_read_header(AVFormatContext *s)
{
AVStream *st;
FFStream *sti;
FFRawVideoDemuxerContext *s1 = s->priv_data;
int ret = 0;
st = avformat_new_stream(s, NULL);
if (!st) {
ret = AVERROR(ENOMEM);
goto fail;
}
sti = ffstream(st);
st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
st->codecpar->codec_id = s->iformat->raw_codec_id;
sti->need_parsing = AVSTREAM_PARSE_FULL_RAW;
sti->avctx->framerate = s1->framerate;
avpriv_set_pts_info(st, 64, 1, 1200000);
fail:
return ret;
}
int ff_raw_subtitle_read_header(AVFormatContext *s)
{
AVStream *st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
st->codecpar->codec_id = s->iformat->raw_codec_id;
st->start_time = 0;
return 0;
}
static int raw_data_read_header(AVFormatContext *s)
{
AVStream *st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
st->codecpar->codec_type = AVMEDIA_TYPE_DATA;
st->codecpar->codec_id = s->iformat->raw_codec_id;
st->start_time = 0;
return 0;
}
/* Note: Do not forget to add new entries to the Makefile as well. */
#define OFFSET(x) offsetof(FFRawVideoDemuxerContext, x)
#define DEC AV_OPT_FLAG_DECODING_PARAM
static const AVOption rawvideo_options[] = {
{ "framerate", "", OFFSET(framerate), AV_OPT_TYPE_VIDEO_RATE, {.str = "25"}, 0, INT_MAX, DEC},
{ "raw_packet_size", "", OFFSET(raw_packet_size), AV_OPT_TYPE_INT, {.i64 = RAW_PACKET_SIZE }, 1, INT_MAX, DEC},
{ NULL },
};
#undef OFFSET
const AVClass ff_rawvideo_demuxer_class = {
.class_name = "generic raw video demuxer",
.item_name = av_default_item_name,
.option = rawvideo_options,
.version = LIBAVUTIL_VERSION_INT,
};
#define OFFSET(x) offsetof(FFRawDemuxerContext, x)
static const AVOption raw_options[] = {
{ "raw_packet_size", "", OFFSET(raw_packet_size), AV_OPT_TYPE_INT, {.i64 = RAW_PACKET_SIZE }, 1, INT_MAX, DEC},
{ NULL },
};
const AVClass ff_raw_demuxer_class = {
.class_name = "generic raw demuxer",
.item_name = av_default_item_name,
.option = raw_options,
.version = LIBAVUTIL_VERSION_INT,
};
#if CONFIG_DATA_DEMUXER
const AVInputFormat ff_data_demuxer = {
.name = "data",
.long_name = NULL_IF_CONFIG_SMALL("raw data"),
.read_header = raw_data_read_header,
.read_packet = ff_raw_read_partial_packet,
.raw_codec_id = AV_CODEC_ID_NONE,
.flags = AVFMT_NOTIMESTAMPS,
.priv_data_size = sizeof(FFRawDemuxerContext),\
.priv_class = &ff_raw_demuxer_class,
};
#endif
#if CONFIG_MJPEG_DEMUXER
static int mjpeg_probe(const AVProbeData *p)
{
int i;
int state = -1;
int nb_invalid = 0;
int nb_frames = 0;
for (i = 0; i < p->buf_size - 1; i++) {
int c;
if (p->buf[i] != 0xFF)
continue;
c = p->buf[i+1];
switch (c) {
case 0xD8:
state = 0xD8;
break;
case 0xC0:
case 0xC1:
case 0xC2:
case 0xC3:
case 0xC5:
case 0xC6:
case 0xC7:
case 0xF7:
if (state == 0xD8) {
state = 0xC0;
} else
nb_invalid++;
break;
case 0xDA:
if (state == 0xC0) {
state = 0xDA;
} else
nb_invalid++;
break;
case 0xD9:
if (state == 0xDA) {
state = 0xD9;
nb_frames++;
} else
nb_invalid++;
break;
default:
if ( (c >= 0x02 && c <= 0xBF)
|| c == 0xC8) {
nb_invalid++;
}
}
}
if (nb_invalid*4 + 1 < nb_frames) {
static const char ct_jpeg[] = "\r\nContent-Type: image/jpeg\r\n";
int i;
for (i=0; i<FFMIN(p->buf_size - (int)sizeof(ct_jpeg), 100); i++)
if (!memcmp(p->buf + i, ct_jpeg, sizeof(ct_jpeg) - 1))
return AVPROBE_SCORE_EXTENSION;
if (nb_invalid == 0 && nb_frames > 2)
return AVPROBE_SCORE_EXTENSION / 2;
return AVPROBE_SCORE_EXTENSION / 4;
}
if (!nb_invalid && nb_frames)
return AVPROBE_SCORE_EXTENSION / 4;
return 0;
}
FF_DEF_RAWVIDEO_DEMUXER2(mjpeg, "raw MJPEG video", mjpeg_probe, "mjpg,mjpeg,mpo", AV_CODEC_ID_MJPEG, AVFMT_GENERIC_INDEX|AVFMT_NOTIMESTAMPS)
#endif
|
