2 * Multipart JPEG format
3 * Copyright (c) 2015 Luca Barbato
5 * This file is part of FFmpeg.
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.
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.
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
22 #include "libavutil/avstring.h"
27 static int get_line(AVIOContext *pb, char *line, int line_size)
29 int i = ff_get_line(pb, line, line_size);
31 if (i > 1 && line[i - 2] == '\r')
43 static int split_tag_value(char **tag, char **value, char *line)
47 while (*p != '\0' && *p != ':')
50 return AVERROR_INVALIDDATA;
57 while (av_isspace(*p))
65 static int check_content_type(char *line)
68 int ret = split_tag_value(&tag, &value, line);
73 if (av_strcasecmp(tag, "Content-type") ||
74 av_strcasecmp(value, "image/jpeg"))
75 return AVERROR_INVALIDDATA;
80 static int mpjpeg_read_probe(AVProbeData *p)
83 char line[128] = { 0 };
86 pb = avio_alloc_context(p->buf, p->buf_size, 0, NULL, NULL, NULL, NULL);
88 return AVERROR(ENOMEM);
90 if (p->buf_size < 2 || p->buf[0] != '-' || p->buf[1] != '-')
93 while (!pb->eof_reached) {
94 ret = get_line(pb, line, sizeof(line));
98 ret = check_content_type(line);
100 ret = AVPROBE_SCORE_MAX;
111 static int mpjpeg_read_header(AVFormatContext *s)
114 char boundary[70 + 2 + 1];
115 int64_t pos = avio_tell(s->pb);
119 ret = get_line(s->pb, boundary, sizeof(boundary));
123 if (strncmp(boundary, "--", 2))
124 return AVERROR_INVALIDDATA;
126 st = avformat_new_stream(s, NULL);
128 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
129 st->codec->codec_id = AV_CODEC_ID_MJPEG;
131 avpriv_set_pts_info(st, 60, 1, 25);
133 avio_seek(s->pb, pos, SEEK_SET);
138 static int parse_content_length(const char *value)
140 long int val = strtol(value, NULL, 10);
142 if (val == LONG_MIN || val == LONG_MAX)
143 return AVERROR(errno);
145 return AVERROR(ERANGE);
149 static int parse_multipart_header(AVFormatContext *s)
152 int found_content_type = 0;
155 ret = get_line(s->pb, line, sizeof(line));
159 if (strncmp(line, "--", 2))
160 return AVERROR_INVALIDDATA;
162 while (!s->pb->eof_reached) {
165 ret = get_line(s->pb, line, sizeof(line));
172 ret = split_tag_value(&tag, &value, line);
176 if (!av_strcasecmp(tag, "Content-type")) {
177 if (av_strcasecmp(value, "image/jpeg")) {
178 av_log(s, AV_LOG_ERROR,
179 "Unexpected %s : %s\n",
181 return AVERROR_INVALIDDATA;
183 found_content_type = 1;
184 } else if (!av_strcasecmp(tag, "Content-Length")) {
185 size = parse_content_length(value);
191 if (!found_content_type || size < 0) {
192 return AVERROR_INVALIDDATA;
198 static int mpjpeg_read_packet(AVFormatContext *s, AVPacket *pkt)
201 int size = parse_multipart_header(s);
206 ret = av_get_packet(s->pb, pkt, size);
210 // trailing empty line
216 AVInputFormat ff_mpjpeg_demuxer = {
218 .long_name = NULL_IF_CONFIG_SMALL("MIME multipart JPEG"),
219 .mime_type = "multipart/x-mixed-replace",
220 .extensions = "mjpg",
221 .read_probe = mpjpeg_read_probe,
222 .read_header = mpjpeg_read_header,
223 .read_packet = mpjpeg_read_packet,