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 "config_components.h"
24
25 #include "avformat.h"
26 #include "internal.h"
27 #include "avio_internal.h"
28 #include "rawdec.h"
29 #include "libavutil/opt.h"
30 #include "libavutil/parseutils.h"
31 #include "libavutil/pixdesc.h"
32 #include "libavutil/intreadwrite.h"
33
34 #define RAW_PACKET_SIZE 1024
35
ff_raw_read_partial_packet(AVFormatContext * s,AVPacket * pkt)36 int ff_raw_read_partial_packet(AVFormatContext *s, AVPacket *pkt)
37 {
38 FFRawDemuxerContext *raw = s->priv_data;
39 int ret, size;
40
41 size = raw->raw_packet_size;
42
43 if ((ret = av_new_packet(pkt, size)) < 0)
44 return ret;
45
46 pkt->pos= avio_tell(s->pb);
47 pkt->stream_index = 0;
48 ret = avio_read_partial(s->pb, pkt->data, size);
49 if (ret < 0) {
50 av_packet_unref(pkt);
51 return ret;
52 }
53 av_shrink_packet(pkt, ret);
54 return ret;
55 }
56
ff_raw_audio_read_header(AVFormatContext * s)57 int ff_raw_audio_read_header(AVFormatContext *s)
58 {
59 AVStream *st = avformat_new_stream(s, NULL);
60 if (!st)
61 return AVERROR(ENOMEM);
62 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
63 st->codecpar->codec_id = s->iformat->raw_codec_id;
64 ffstream(st)->need_parsing = AVSTREAM_PARSE_FULL_RAW;
65 st->start_time = 0;
66 /* the parameters will be extracted from the compressed bitstream */
67
68 return 0;
69 }
70
71 /* MPEG-1/H.263 input */
ff_raw_video_read_header(AVFormatContext * s)72 int ff_raw_video_read_header(AVFormatContext *s)
73 {
74 AVStream *st;
75 FFStream *sti;
76 FFRawVideoDemuxerContext *s1 = s->priv_data;
77 int ret = 0;
78
79
80 st = avformat_new_stream(s, NULL);
81 if (!st) {
82 ret = AVERROR(ENOMEM);
83 goto fail;
84 }
85 sti = ffstream(st);
86
87 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
88 st->codecpar->codec_id = s->iformat->raw_codec_id;
89 sti->need_parsing = AVSTREAM_PARSE_FULL_RAW;
90
91 sti->avctx->framerate = s1->framerate;
92 avpriv_set_pts_info(st, 64, 1, 1200000);
93
94 fail:
95 return ret;
96 }
97
ff_raw_subtitle_read_header(AVFormatContext * s)98 int ff_raw_subtitle_read_header(AVFormatContext *s)
99 {
100 AVStream *st = avformat_new_stream(s, NULL);
101 if (!st)
102 return AVERROR(ENOMEM);
103 st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
104 st->codecpar->codec_id = s->iformat->raw_codec_id;
105 st->start_time = 0;
106 return 0;
107 }
108
raw_data_read_header(AVFormatContext * s)109 static int raw_data_read_header(AVFormatContext *s)
110 {
111 AVStream *st = avformat_new_stream(s, NULL);
112 if (!st)
113 return AVERROR(ENOMEM);
114 st->codecpar->codec_type = AVMEDIA_TYPE_DATA;
115 st->codecpar->codec_id = s->iformat->raw_codec_id;
116 st->start_time = 0;
117 return 0;
118 }
119
120 /* Note: Do not forget to add new entries to the Makefile as well. */
121
122 #define OFFSET(x) offsetof(FFRawVideoDemuxerContext, x)
123 #define DEC AV_OPT_FLAG_DECODING_PARAM
124 static const AVOption rawvideo_options[] = {
125 { "framerate", "", OFFSET(framerate), AV_OPT_TYPE_VIDEO_RATE, {.str = "25"}, 0, INT_MAX, DEC},
126 { "raw_packet_size", "", OFFSET(raw_packet_size), AV_OPT_TYPE_INT, {.i64 = RAW_PACKET_SIZE }, 1, INT_MAX, DEC},
127 { NULL },
128 };
129 #undef OFFSET
130
131 const AVClass ff_rawvideo_demuxer_class = {
132 .class_name = "generic raw video demuxer",
133 .item_name = av_default_item_name,
134 .option = rawvideo_options,
135 .version = LIBAVUTIL_VERSION_INT,
136 };
137
138 #define OFFSET(x) offsetof(FFRawDemuxerContext, x)
139 const AVOption ff_raw_options[] = {
140 { "raw_packet_size", "", OFFSET(raw_packet_size), AV_OPT_TYPE_INT, {.i64 = RAW_PACKET_SIZE }, 1, INT_MAX, DEC},
141 { NULL },
142 };
143
144 const AVClass ff_raw_demuxer_class = {
145 .class_name = "generic raw demuxer",
146 .item_name = av_default_item_name,
147 .option = ff_raw_options,
148 .version = LIBAVUTIL_VERSION_INT,
149 };
150
151 #if CONFIG_DATA_DEMUXER
152 const AVInputFormat ff_data_demuxer = {
153 .name = "data",
154 .long_name = NULL_IF_CONFIG_SMALL("raw data"),
155 .read_header = raw_data_read_header,
156 .read_packet = ff_raw_read_partial_packet,
157 .raw_codec_id = AV_CODEC_ID_NONE,
158 .flags = AVFMT_NOTIMESTAMPS,
159 .priv_data_size = sizeof(FFRawDemuxerContext),\
160 .priv_class = &ff_raw_demuxer_class,
161 };
162 #endif
163
164 #if CONFIG_MJPEG_DEMUXER
mjpeg_probe(const AVProbeData * p)165 static int mjpeg_probe(const AVProbeData *p)
166 {
167 int i;
168 int state = -1;
169 int nb_invalid = 0;
170 int nb_frames = 0;
171
172 for (i = 0; i < p->buf_size - 1; i++) {
173 int c;
174 if (p->buf[i] != 0xFF)
175 continue;
176 c = p->buf[i+1];
177 switch (c) {
178 case 0xD8:
179 state = 0xD8;
180 break;
181 case 0xC0:
182 case 0xC1:
183 case 0xC2:
184 case 0xC3:
185 case 0xC5:
186 case 0xC6:
187 case 0xC7:
188 case 0xF7:
189 if (state == 0xD8) {
190 state = 0xC0;
191 } else
192 nb_invalid++;
193 break;
194 case 0xDA:
195 if (state == 0xC0) {
196 state = 0xDA;
197 } else
198 nb_invalid++;
199 break;
200 case 0xD9:
201 if (state == 0xDA) {
202 state = 0xD9;
203 nb_frames++;
204 } else
205 nb_invalid++;
206 break;
207 default:
208 if ( (c >= 0x02 && c <= 0xBF)
209 || c == 0xC8) {
210 nb_invalid++;
211 }
212 }
213 }
214
215 if (nb_invalid*4 + 1 < nb_frames) {
216 static const char ct_jpeg[] = "\r\nContent-Type: image/jpeg\r\n";
217 int i;
218
219 for (i=0; i<FFMIN(p->buf_size - (int)sizeof(ct_jpeg), 100); i++)
220 if (!memcmp(p->buf + i, ct_jpeg, sizeof(ct_jpeg) - 1))
221 return AVPROBE_SCORE_EXTENSION;
222
223 if (nb_invalid == 0 && nb_frames > 2)
224 return AVPROBE_SCORE_EXTENSION / 2;
225 return AVPROBE_SCORE_EXTENSION / 4;
226 }
227 if (!nb_invalid && nb_frames)
228 return AVPROBE_SCORE_EXTENSION / 4;
229
230 return 0;
231 }
232
233 FF_DEF_RAWVIDEO_DEMUXER2(mjpeg, "raw MJPEG video", mjpeg_probe, "mjpg,mjpeg,mpo", AV_CODEC_ID_MJPEG, AVFMT_GENERIC_INDEX|AVFMT_NOTIMESTAMPS)
234 #endif
235