mirror of https://git.ffmpeg.org/ffmpeg.git
avformat/mpjpeg: allow processing of MIME parts without Content-Length header
Fixes ticket 5023 Signed-off-by: Alex Agranovsky <alex@sighthound.com>
This commit is contained in:
Alex Agranovsky
wm4
parent
97b8db334a
commit
79103f2199
|
|
@ -23,13 +23,30 @@
|
|||
|
||||
#include "avformat.h"
|
||||
#include "internal.h"
|
||||
#include "avio_internal.h"
|
||||
|
||||
|
||||
|
||||
typedef struct MPJPEGDemuxContext {
|
||||
char *boundary;
|
||||
char *searchstr;
|
||||
int searchstr_len;
|
||||
} MPJPEGDemuxContext;
|
||||
|
||||
|
||||
static void trim_right(char *p)
|
||||
{
|
||||
if (!p || !*p)
|
||||
return;
|
||||
|
||||
char *end = p + strlen(p);
|
||||
while (end > p && av_isspace(*(end-1)))
|
||||
*(--end) = '\0';
|
||||
}
|
||||
|
||||
static int get_line(AVIOContext *pb, char *line, int line_size)
|
||||
{
|
||||
int i = ff_get_line(pb, line, line_size);
|
||||
|
||||
if (i > 1 && line[i - 2] == '\r')
|
||||
line[i - 2] = '\0';
|
||||
ff_get_line(pb, line, line_size);
|
||||
|
||||
if (pb->error)
|
||||
return pb->error;
|
||||
|
|
@ -37,21 +54,11 @@ static int get_line(AVIOContext *pb, char *line, int line_size)
|
|||
if (pb->eof_reached)
|
||||
return AVERROR_EOF;
|
||||
|
||||
trim_right(line);
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
static void trim_right(char* p)
|
||||
{
|
||||
char *end;
|
||||
if (!p || !*p)
|
||||
return;
|
||||
end = p + strlen(p) - 1;
|
||||
while (end != p && av_isspace(*end)) {
|
||||
*end = '\0';
|
||||
end--;
|
||||
}
|
||||
}
|
||||
|
||||
static int split_tag_value(char **tag, char **value, char *line)
|
||||
{
|
||||
|
|
@ -86,12 +93,24 @@ static int split_tag_value(char **tag, char **value, char *line)
|
|||
return 0;
|
||||
}
|
||||
|
||||
static int parse_multipart_header(AVIOContext *pb, void *log_ctx);
|
||||
static int parse_multipart_header(AVIOContext *pb,
|
||||
int* size,
|
||||
const char* expected_boundary,
|
||||
void *log_ctx);
|
||||
|
||||
static int mpjpeg_read_close(AVFormatContext *s)
|
||||
{
|
||||
MPJPEGDemuxContext *mpjpeg = s->priv_data;
|
||||
av_freep(&mpjpeg->boundary);
|
||||
av_freep(&mpjpeg->searchstr);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int mpjpeg_read_probe(AVProbeData *p)
|
||||
{
|
||||
AVIOContext *pb;
|
||||
int ret = 0;
|
||||
int size = 0;
|
||||
|
||||
if (p->buf_size < 2 || p->buf[0] != '-' || p->buf[1] != '-')
|
||||
return 0;
|
||||
|
|
@ -100,7 +119,7 @@ static int mpjpeg_read_probe(AVProbeData *p)
|
|||
if (!pb)
|
||||
return 0;
|
||||
|
||||
ret = (parse_multipart_header(pb, NULL)>0)?AVPROBE_SCORE_MAX:0;
|
||||
ret = (parse_multipart_header(pb, &size, "--", NULL) > 0) ? AVPROBE_SCORE_MAX : 0;
|
||||
|
||||
av_free(pb);
|
||||
|
||||
|
|
@ -110,14 +129,15 @@ static int mpjpeg_read_probe(AVProbeData *p)
|
|||
static int mpjpeg_read_header(AVFormatContext *s)
|
||||
{
|
||||
AVStream *st;
|
||||
char boundary[70 + 2 + 1];
|
||||
char boundary[70 + 2 + 1] = {0};
|
||||
int64_t pos = avio_tell(s->pb);
|
||||
int ret;
|
||||
|
||||
|
||||
ret = get_line(s->pb, boundary, sizeof(boundary));
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
do {
|
||||
ret = get_line(s->pb, boundary, sizeof(boundary));
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
} while (!boundary[0]);
|
||||
|
||||
if (strncmp(boundary, "--", 2))
|
||||
return AVERROR_INVALIDDATA;
|
||||
|
|
@ -147,11 +167,16 @@ static int parse_content_length(const char *value)
|
|||
return val;
|
||||
}
|
||||
|
||||
static int parse_multipart_header(AVIOContext *pb, void *log_ctx)
|
||||
static int parse_multipart_header(AVIOContext *pb,
|
||||
int* size,
|
||||
const char* expected_boundary,
|
||||
void *log_ctx)
|
||||
{
|
||||
char line[128];
|
||||
int found_content_type = 0;
|
||||
int ret, size = -1;
|
||||
int ret;
|
||||
|
||||
*size = -1;
|
||||
|
||||
// get the CRLF as empty string
|
||||
ret = get_line(pb, line, sizeof(line));
|
||||
|
|
@ -161,14 +186,21 @@ static int parse_multipart_header(AVIOContext *pb, void *log_ctx)
|
|||
/* some implementation do not provide the required
|
||||
* initial CRLF (see rfc1341 7.2.1)
|
||||
*/
|
||||
if (!line[0]) {
|
||||
while (!line[0]) {
|
||||
ret = get_line(pb, line, sizeof(line));
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
}
|
||||
|
||||
if (strncmp(line, "--", 2))
|
||||
if (!av_strstart(line, expected_boundary, NULL)) {
|
||||
av_log(log_ctx,
|
||||
AV_LOG_ERROR,
|
||||
"Expected boundary '%s' not found, instead found a line of %zu bytes\n",
|
||||
expected_boundary,
|
||||
strlen(line));
|
||||
|
||||
return AVERROR_INVALIDDATA;
|
||||
}
|
||||
|
||||
while (!pb->eof_reached) {
|
||||
char *tag, *value;
|
||||
|
|
@ -191,42 +223,90 @@ static int parse_multipart_header(AVIOContext *pb, void *log_ctx)
|
|||
|
||||
if (!av_strcasecmp(tag, "Content-type")) {
|
||||
if (av_strcasecmp(value, "image/jpeg")) {
|
||||
if (log_ctx) {
|
||||
av_log(log_ctx, AV_LOG_ERROR,
|
||||
av_log(log_ctx, AV_LOG_ERROR,
|
||||
"Unexpected %s : %s\n",
|
||||
tag, value);
|
||||
}
|
||||
|
||||
return AVERROR_INVALIDDATA;
|
||||
} else
|
||||
found_content_type = 1;
|
||||
} else if (!av_strcasecmp(tag, "Content-Length")) {
|
||||
size = parse_content_length(value);
|
||||
if (size < 0)
|
||||
return size;
|
||||
*size = parse_content_length(value);
|
||||
if ( *size < 0 )
|
||||
av_log(log_ctx, AV_LOG_WARNING,
|
||||
"Invalid Content-Length value : %s\n",
|
||||
value);
|
||||
}
|
||||
}
|
||||
|
||||
if (!found_content_type || size < 0) {
|
||||
return AVERROR_INVALIDDATA;
|
||||
}
|
||||
|
||||
return size;
|
||||
return found_content_type ? 0 : AVERROR_INVALIDDATA;
|
||||
}
|
||||
|
||||
|
||||
static int mpjpeg_read_packet(AVFormatContext *s, AVPacket *pkt)
|
||||
{
|
||||
int size;
|
||||
int ret;
|
||||
int size = parse_multipart_header(s->pb, s);
|
||||
|
||||
if (size < 0)
|
||||
return size;
|
||||
MPJPEGDemuxContext *mpjpeg = s->priv_data;
|
||||
if (mpjpeg->boundary == NULL) {
|
||||
mpjpeg->boundary = av_strdup("--");
|
||||
mpjpeg->searchstr = av_strdup("\r\n--");
|
||||
if (!mpjpeg->boundary || !mpjpeg->searchstr) {
|
||||
av_freep(&mpjpeg->boundary);
|
||||
av_freep(&mpjpeg->searchstr);
|
||||
return AVERROR(ENOMEM);
|
||||
}
|
||||
mpjpeg->searchstr_len = strlen(mpjpeg->searchstr);
|
||||
}
|
||||
|
||||
ret = parse_multipart_header(s->pb, &size, mpjpeg->boundary, s);
|
||||
|
||||
|
||||
ret = av_get_packet(s->pb, pkt, size);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
return 0;
|
||||
if (size > 0) {
|
||||
/* size has been provided to us in MIME header */
|
||||
ret = av_get_packet(s->pb, pkt, size);
|
||||
} else {
|
||||
/* no size was given -- we read until the next boundary or end-of-file */
|
||||
int remaining = 0, len;
|
||||
|
||||
const int read_chunk = 2048;
|
||||
av_init_packet(pkt);
|
||||
pkt->data = NULL;
|
||||
pkt->size = 0;
|
||||
pkt->pos = avio_tell(s->pb);
|
||||
|
||||
/* we may need to return as much as all we've read back to the buffer */
|
||||
ffio_ensure_seekback(s->pb, read_chunk);
|
||||
|
||||
while ((ret = av_append_packet(s->pb, pkt, read_chunk - remaining)) >= 0) {
|
||||
/* scan the new data */
|
||||
len = ret + remaining;
|
||||
char *start = pkt->data + pkt->size - len;
|
||||
do {
|
||||
if (!memcmp(start, mpjpeg->searchstr, mpjpeg->searchstr_len)) {
|
||||
// got the boundary! rewind the stream
|
||||
avio_seek(s->pb, -(len-2), SEEK_CUR);
|
||||
pkt->size -= (len-2);
|
||||
return pkt->size;
|
||||
}
|
||||
len--;
|
||||
start++;
|
||||
} while (len >= mpjpeg->searchstr_len);
|
||||
remaining = len;
|
||||
}
|
||||
|
||||
/* error or EOF occurred */
|
||||
if (ret == AVERROR_EOF) {
|
||||
ret = pkt->size > 0 ? pkt->size : AVERROR_EOF;
|
||||
} else {
|
||||
av_packet_unref(pkt);
|
||||
}
|
||||
}
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
AVInputFormat ff_mpjpeg_demuxer = {
|
||||
|
|
@ -234,7 +314,9 @@ AVInputFormat ff_mpjpeg_demuxer = {
|
|||
.long_name = NULL_IF_CONFIG_SMALL("MIME multipart JPEG"),
|
||||
.mime_type = "multipart/x-mixed-replace",
|
||||
.extensions = "mjpg",
|
||||
.priv_data_size = sizeof(MPJPEGDemuxContext),
|
||||
.read_probe = mpjpeg_read_probe,
|
||||
.read_header = mpjpeg_read_header,
|
||||
.read_packet = mpjpeg_read_packet,
|
||||
.read_close = mpjpeg_read_close
|
||||
};
|
||||
|
|
|
|||
Loading…
Reference in New Issue