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
ff_raw_read_partial_packet(AVFormatContext * s,AVPacket * pkt)35 int ff_raw_read_partial_packet(AVFormatContext *s, AVPacket *pkt)
36 {
37 FFRawDemuxerContext *raw = s->priv_data;
38 int ret, size;
39
40 size = raw->raw_packet_size;
41
42 if ((ret = av_new_packet(pkt, size)) < 0)
43 return ret;
44
45 pkt->pos= avio_tell(s->pb);
46 pkt->stream_index = 0;
47 ret = avio_read_partial(s->pb, pkt->data, size);
48 if (ret < 0) {
49 av_packet_unref(pkt);
50 return ret;
51 }
52 av_shrink_packet(pkt, ret);
53 return ret;
54 }
55
ff_raw_audio_read_header(AVFormatContext * s)56 int ff_raw_audio_read_header(AVFormatContext *s)
57 {
58 AVStream *st = avformat_new_stream(s, NULL);
59 if (!st)
60 return AVERROR(ENOMEM);
61 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
62 st->codecpar->codec_id = s->iformat->raw_codec_id;
63 st->need_parsing = AVSTREAM_PARSE_FULL_RAW;
64 st->start_time = 0;
65 /* the parameters will be extracted from the compressed bitstream */
66
67 return 0;
68 }
69
70 /* MPEG-1/H.263 input */
ff_raw_video_read_header(AVFormatContext * s)71 int ff_raw_video_read_header(AVFormatContext *s)
72 {
73 AVStream *st;
74 FFRawVideoDemuxerContext *s1 = s->priv_data;
75 int ret = 0;
76
77
78 st = avformat_new_stream(s, NULL);
79 if (!st) {
80 ret = AVERROR(ENOMEM);
81 goto fail;
82 }
83
84 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
85 st->codecpar->codec_id = s->iformat->raw_codec_id;
86 st->need_parsing = AVSTREAM_PARSE_FULL_RAW;
87
88 st->internal->avctx->framerate = s1->framerate;
89 avpriv_set_pts_info(st, 64, 1, 1200000);
90
91 fail:
92 return ret;
93 }
94
ff_raw_subtitle_read_header(AVFormatContext * s)95 int ff_raw_subtitle_read_header(AVFormatContext *s)
96 {
97 AVStream *st = avformat_new_stream(s, NULL);
98 if (!st)
99 return AVERROR(ENOMEM);
100 st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
101 st->codecpar->codec_id = s->iformat->raw_codec_id;
102 st->start_time = 0;
103 return 0;
104 }
105
ff_raw_data_read_header(AVFormatContext * s)106 int ff_raw_data_read_header(AVFormatContext *s)
107 {
108 AVStream *st = avformat_new_stream(s, NULL);
109 if (!st)
110 return AVERROR(ENOMEM);
111 st->codecpar->codec_type = AVMEDIA_TYPE_DATA;
112 st->codecpar->codec_id = s->iformat->raw_codec_id;
113 st->start_time = 0;
114 return 0;
115 }
116
117 /* Note: Do not forget to add new entries to the Makefile as well. */
118
119 #define OFFSET(x) offsetof(FFRawVideoDemuxerContext, x)
120 #define DEC AV_OPT_FLAG_DECODING_PARAM
121 const AVOption ff_rawvideo_options[] = {
122 { "framerate", "", OFFSET(framerate), AV_OPT_TYPE_VIDEO_RATE, {.str = "25"}, 0, INT_MAX, DEC},
123 { "raw_packet_size", "", OFFSET(raw_packet_size), AV_OPT_TYPE_INT, {.i64 = RAW_PACKET_SIZE }, 1, INT_MAX, DEC},
124 { NULL },
125 };
126 #undef OFFSET
127 #define OFFSET(x) offsetof(FFRawDemuxerContext, x)
128 const AVOption ff_raw_options[] = {
129 { "raw_packet_size", "", OFFSET(raw_packet_size), AV_OPT_TYPE_INT, {.i64 = RAW_PACKET_SIZE }, 1, INT_MAX, DEC},
130 { NULL },
131 };
132
133 const AVClass ff_raw_demuxer_class = {
134 .class_name = "generic raw demuxer",
135 .item_name = av_default_item_name,
136 .option = ff_raw_options,
137 .version = LIBAVUTIL_VERSION_INT,
138 };
139
140 #if CONFIG_DATA_DEMUXER
141 FF_RAW_DEMUXER_CLASS(raw_data)
142
143 AVInputFormat ff_data_demuxer = {
144 .name = "data",
145 .long_name = NULL_IF_CONFIG_SMALL("raw data"),
146 .read_header = ff_raw_data_read_header,
147 .read_packet = ff_raw_read_partial_packet,
148 .raw_codec_id = AV_CODEC_ID_NONE,
149 .flags = AVFMT_NOTIMESTAMPS,
150 .priv_data_size = sizeof(FFRawDemuxerContext),\
151 .priv_class = &raw_data_demuxer_class,\
152 };
153 #endif
154
155 #if CONFIG_MJPEG_DEMUXER
mjpeg_probe(const AVProbeData * p)156 static int mjpeg_probe(const AVProbeData *p)
157 {
158 int i;
159 int state = -1;
160 int nb_invalid = 0;
161 int nb_frames = 0;
162
163 for (i = 0; i < p->buf_size - 1; i++) {
164 int c;
165 if (p->buf[i] != 0xFF)
166 continue;
167 c = p->buf[i+1];
168 switch (c) {
169 case 0xD8:
170 state = 0xD8;
171 break;
172 case 0xC0:
173 case 0xC1:
174 case 0xC2:
175 case 0xC3:
176 case 0xC5:
177 case 0xC6:
178 case 0xC7:
179 case 0xF7:
180 if (state == 0xD8) {
181 state = 0xC0;
182 } else
183 nb_invalid++;
184 break;
185 case 0xDA:
186 if (state == 0xC0) {
187 state = 0xDA;
188 } else
189 nb_invalid++;
190 break;
191 case 0xD9:
192 if (state == 0xDA) {
193 state = 0xD9;
194 nb_frames++;
195 } else
196 nb_invalid++;
197 break;
198 default:
199 if ( (c >= 0x02 && c <= 0xBF)
200 || c == 0xC8) {
201 nb_invalid++;
202 }
203 }
204 }
205
206 if (nb_invalid*4 + 1 < nb_frames) {
207 static const char ct_jpeg[] = "\r\nContent-Type: image/jpeg\r\n";
208 int i;
209
210 for (i=0; i<FFMIN(p->buf_size - (int)sizeof(ct_jpeg), 100); i++)
211 if (!memcmp(p->buf + i, ct_jpeg, sizeof(ct_jpeg) - 1))
212 return AVPROBE_SCORE_EXTENSION;
213
214 if (nb_invalid == 0 && nb_frames > 2)
215 return AVPROBE_SCORE_EXTENSION / 2;
216 return AVPROBE_SCORE_EXTENSION / 4;
217 }
218 if (!nb_invalid && nb_frames)
219 return AVPROBE_SCORE_EXTENSION / 4;
220
221 return 0;
222 }
223
224 FF_DEF_RAWVIDEO_DEMUXER2(mjpeg, "raw MJPEG video", mjpeg_probe, "mjpg,mjpeg,mpo", AV_CODEC_ID_MJPEG, AVFMT_GENERIC_INDEX|AVFMT_NOTIMESTAMPS)
225 #endif
226