397 lines
10 KiB
C
397 lines
10 KiB
C
/*
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* Multipart JPEG format
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* Copyright (c) 2015 Luca Barbato
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/avstring.h"
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#include "libavutil/opt.h"
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#include "avformat.h"
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#include "internal.h"
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#include "avio_internal.h"
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typedef struct MPJPEGDemuxContext {
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const AVClass *class;
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char *boundary;
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char *searchstr;
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int searchstr_len;
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int strict_mime_boundary;
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} MPJPEGDemuxContext;
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static void trim_right(char *p)
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{
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char *end;
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if (!p || !*p)
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return;
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end = p + strlen(p);
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while (end > p && av_isspace(*(end-1)))
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*(--end) = '\0';
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}
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static int get_line(AVIOContext *pb, char *line, int line_size)
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{
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ff_get_line(pb, line, line_size);
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if (pb->error)
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return pb->error;
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if (pb->eof_reached)
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return AVERROR_EOF;
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trim_right(line);
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return 0;
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}
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static int split_tag_value(char **tag, char **value, char *line)
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{
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char *p = line;
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int foundData = 0;
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*tag = NULL;
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*value = NULL;
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while (*p != '\0' && *p != ':') {
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if (!av_isspace(*p)) {
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foundData = 1;
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}
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p++;
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}
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if (*p != ':')
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return foundData ? AVERROR_INVALIDDATA : 0;
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*p = '\0';
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*tag = line;
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trim_right(*tag);
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p++;
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while (av_isspace(*p))
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p++;
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*value = p;
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trim_right(*value);
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return 0;
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}
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static int parse_multipart_header(AVIOContext *pb,
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int* size,
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const char* expected_boundary,
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void *log_ctx);
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static int mpjpeg_read_close(AVFormatContext *s)
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{
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MPJPEGDemuxContext *mpjpeg = s->priv_data;
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av_freep(&mpjpeg->boundary);
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av_freep(&mpjpeg->searchstr);
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return 0;
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}
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static int mpjpeg_read_probe(const AVProbeData *p)
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{
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AVIOContext pb;
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int ret = 0;
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int size = 0;
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if (p->buf_size < 2 || p->buf[0] != '-' || p->buf[1] != '-')
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return 0;
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ffio_init_context(&pb, p->buf, p->buf_size, 0, NULL, NULL, NULL, NULL);
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ret = (parse_multipart_header(&pb, &size, "--", NULL) >= 0) ? AVPROBE_SCORE_MAX : 0;
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return ret;
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}
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static int mpjpeg_read_header(AVFormatContext *s)
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{
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AVStream *st;
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char boundary[70 + 2 + 1] = {0};
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int64_t pos = avio_tell(s->pb);
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int ret;
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do {
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ret = get_line(s->pb, boundary, sizeof(boundary));
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if (ret < 0)
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return ret;
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} while (!boundary[0]);
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if (strncmp(boundary, "--", 2))
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return AVERROR_INVALIDDATA;
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st = avformat_new_stream(s, NULL);
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if (!st)
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return AVERROR(ENOMEM);
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st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
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st->codecpar->codec_id = AV_CODEC_ID_MJPEG;
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avpriv_set_pts_info(st, 60, 1, 25);
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avio_seek(s->pb, pos, SEEK_SET);
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return 0;
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}
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static int parse_content_length(const char *value)
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{
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long int val = strtol(value, NULL, 10);
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if (val == LONG_MIN || val == LONG_MAX)
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return AVERROR(errno);
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if (val > INT_MAX)
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return AVERROR(ERANGE);
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return val;
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}
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static int parse_multipart_header(AVIOContext *pb,
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int* size,
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const char* expected_boundary,
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void *log_ctx)
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{
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char line[128];
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int found_content_type = 0;
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int ret;
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*size = -1;
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// get the CRLF as empty string
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ret = get_line(pb, line, sizeof(line));
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if (ret < 0)
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return ret;
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/* some implementation do not provide the required
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* initial CRLF (see rfc1341 7.2.1)
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*/
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while (!line[0]) {
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ret = get_line(pb, line, sizeof(line));
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if (ret < 0)
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return ret;
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}
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if (!av_strstart(line, expected_boundary, NULL)) {
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if (log_ctx)
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av_log(log_ctx,
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AV_LOG_ERROR,
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"Expected boundary '%s' not found, instead found a line of %"SIZE_SPECIFIER" bytes\n",
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expected_boundary,
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strlen(line));
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return AVERROR_INVALIDDATA;
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}
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while (!pb->eof_reached) {
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char *tag, *value;
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ret = get_line(pb, line, sizeof(line));
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if (ret < 0) {
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if (ret == AVERROR_EOF)
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break;
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return ret;
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}
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if (line[0] == '\0')
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break;
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ret = split_tag_value(&tag, &value, line);
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if (ret < 0)
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return ret;
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if (value==NULL || tag==NULL)
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break;
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if (!av_strcasecmp(tag, "Content-type")) {
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if (av_strcasecmp(value, "image/jpeg")) {
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if (log_ctx)
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av_log(log_ctx, AV_LOG_ERROR,
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"Unexpected %s : %s\n",
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tag, value);
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return AVERROR_INVALIDDATA;
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} else
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found_content_type = 1;
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} else if (!av_strcasecmp(tag, "Content-Length")) {
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*size = parse_content_length(value);
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if ( *size < 0 )
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if (log_ctx)
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av_log(log_ctx, AV_LOG_WARNING,
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"Invalid Content-Length value : %s\n",
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value);
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}
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}
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return found_content_type ? 0 : AVERROR_INVALIDDATA;
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}
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static char* mpjpeg_get_boundary(AVIOContext* pb)
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{
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uint8_t *mime_type = NULL;
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const char *start;
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const char *end;
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uint8_t *res = NULL;
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int len;
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/* get MIME type, and skip to the first parameter */
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av_opt_get(pb, "mime_type", AV_OPT_SEARCH_CHILDREN, &mime_type);
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start = mime_type;
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while (start != NULL && *start != '\0') {
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start = strchr(start, ';');
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if (!start)
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break;
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start = start+1;
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while (av_isspace(*start))
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start++;
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if (av_stristart(start, "boundary=", &start)) {
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end = strchr(start, ';');
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if (end)
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len = end - start - 1;
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else
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len = strlen(start);
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/* some endpoints may enclose the boundary
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in Content-Type in quotes */
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if ( len>2 && *start == '"' && start[len-1] == '"' ) {
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start++;
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len -= 2;
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}
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res = av_strndup(start, len);
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break;
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}
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}
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av_freep(&mime_type);
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return res;
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}
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static int mpjpeg_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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int size;
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int ret;
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MPJPEGDemuxContext *mpjpeg = s->priv_data;
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if (mpjpeg->boundary == NULL) {
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uint8_t* boundary = NULL;
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if (mpjpeg->strict_mime_boundary) {
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boundary = mpjpeg_get_boundary(s->pb);
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}
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if (boundary != NULL) {
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mpjpeg->boundary = av_asprintf("--%s", boundary);
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mpjpeg->searchstr = av_asprintf("\r\n--%s\r\n", boundary);
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av_freep(&boundary);
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} else {
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mpjpeg->boundary = av_strdup("--");
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mpjpeg->searchstr = av_strdup("\r\n--");
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}
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if (!mpjpeg->boundary || !mpjpeg->searchstr) {
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av_freep(&mpjpeg->boundary);
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av_freep(&mpjpeg->searchstr);
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return AVERROR(ENOMEM);
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}
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mpjpeg->searchstr_len = strlen(mpjpeg->searchstr);
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}
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ret = parse_multipart_header(s->pb, &size, mpjpeg->boundary, s);
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if (ret < 0)
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return ret;
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if (size > 0) {
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/* size has been provided to us in MIME header */
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ret = av_get_packet(s->pb, pkt, size);
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} else {
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/* no size was given -- we read until the next boundary or end-of-file */
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int remaining = 0, len;
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const int read_chunk = 2048;
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pkt->pos = avio_tell(s->pb);
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while ((ret = ffio_ensure_seekback(s->pb, read_chunk - remaining)) >= 0 && /* we may need to return as much as all we've read back to the buffer */
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(ret = av_append_packet(s->pb, pkt, read_chunk - remaining)) >= 0) {
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/* scan the new data */
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char *start;
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len = ret + remaining;
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start = pkt->data + pkt->size - len;
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do {
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if (!memcmp(start, mpjpeg->searchstr, mpjpeg->searchstr_len)) {
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// got the boundary! rewind the stream
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avio_seek(s->pb, -len, SEEK_CUR);
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pkt->size -= len;
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return pkt->size;
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}
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len--;
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start++;
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} while (len >= mpjpeg->searchstr_len);
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remaining = len;
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}
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/* error or EOF occurred */
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if (ret == AVERROR_EOF) {
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ret = pkt->size > 0 ? pkt->size : AVERROR_EOF;
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}
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}
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return ret;
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}
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#define OFFSET(x) offsetof(MPJPEGDemuxContext, x)
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#define DEC AV_OPT_FLAG_DECODING_PARAM
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static const AVOption mpjpeg_options[] = {
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{ "strict_mime_boundary", "require MIME boundaries match", OFFSET(strict_mime_boundary), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, DEC },
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{ NULL }
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};
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static const AVClass mpjpeg_demuxer_class = {
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.class_name = "MPJPEG demuxer",
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.item_name = av_default_item_name,
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.option = mpjpeg_options,
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.version = LIBAVUTIL_VERSION_INT,
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};
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AVInputFormat ff_mpjpeg_demuxer = {
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.name = "mpjpeg",
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.long_name = NULL_IF_CONFIG_SMALL("MIME multipart JPEG"),
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.mime_type = "multipart/x-mixed-replace",
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.extensions = "mjpg",
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.priv_data_size = sizeof(MPJPEGDemuxContext),
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.read_probe = mpjpeg_read_probe,
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.read_header = mpjpeg_read_header,
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.read_packet = mpjpeg_read_packet,
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.read_close = mpjpeg_read_close,
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.priv_class = &mpjpeg_demuxer_class,
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.flags = AVFMT_NOTIMESTAMPS,
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};
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