mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-12-04 23:46:43 +00:00
c2ac57f6c9
If the len of the string turns out to be 0, str[len - 1] resolved to str[-1] which is not a good idea. Fixes: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=46543 Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/2147>
426 lines
13 KiB
C
426 lines
13 KiB
C
/* GStreamer
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* Copyright (C) 2020 Huawei Technologies Co., Ltd.
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* @Author: Stéphane Cerveau <scerveau@collabora.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library 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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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the Free
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* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <stdio.h>
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#include "gstsubparseelements.h"
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GST_DEBUG_CATEGORY (sub_parse_debug);
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/* regex type enum */
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typedef enum
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{
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GST_SUB_PARSE_REGEX_UNKNOWN = 0,
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GST_SUB_PARSE_REGEX_MDVDSUB = 1,
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GST_SUB_PARSE_REGEX_SUBRIP = 2,
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GST_SUB_PARSE_REGEX_DKS = 3,
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GST_SUB_PARSE_REGEX_VTT = 4,
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} GstSubParseRegex;
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static gpointer
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gst_sub_parse_data_format_autodetect_regex_once (GstSubParseRegex regtype)
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{
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gpointer result = NULL;
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GError *gerr = NULL;
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switch (regtype) {
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case GST_SUB_PARSE_REGEX_MDVDSUB:
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result =
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(gpointer) g_regex_new ("^\\{[0-9]+\\}\\{[0-9]+\\}",
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G_REGEX_RAW | G_REGEX_OPTIMIZE, 0, &gerr);
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if (result == NULL) {
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g_warning ("Compilation of mdvd regex failed: %s", gerr->message);
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g_clear_error (&gerr);
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}
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break;
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case GST_SUB_PARSE_REGEX_SUBRIP:
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result = (gpointer)
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g_regex_new ("^[\\s\\n]*[\\n]? {0,3}[ 0-9]{1,4}\\s*(\x0d)?\x0a"
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" ?[0-9]{1,2}: ?[0-9]{1,2}: ?[0-9]{1,2}[,.] {0,2}[0-9]{1,3}"
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" +--> +[0-9]{1,2}: ?[0-9]{1,2}: ?[0-9]{1,2}[,.] {0,2}[0-9]{1,2}",
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G_REGEX_RAW | G_REGEX_OPTIMIZE, 0, &gerr);
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if (result == NULL) {
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g_warning ("Compilation of subrip regex failed: %s", gerr->message);
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g_clear_error (&gerr);
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}
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break;
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case GST_SUB_PARSE_REGEX_DKS:
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result = (gpointer) g_regex_new ("^\\[[0-9]+:[0-9]+:[0-9]+\\].*",
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G_REGEX_RAW | G_REGEX_OPTIMIZE, 0, &gerr);
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if (result == NULL) {
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g_warning ("Compilation of dks regex failed: %s", gerr->message);
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g_clear_error (&gerr);
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}
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break;
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case GST_SUB_PARSE_REGEX_VTT:
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result = (gpointer)
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g_regex_new ("^(\\xef\\xbb\\xbf)?WEBVTT[\\xa\\xd\\x20\\x9]", 0, 0,
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&gerr);
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if (result == NULL) {
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g_warning ("Compilation of vtt regex failed: %s", gerr->message);
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g_error_free (gerr);
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}
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break;
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default:
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GST_WARNING ("Trying to allocate regex of unknown type %u", regtype);
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}
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return result;
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}
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/*
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* FIXME: maybe we should pass along a second argument, the preceding
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* text buffer, because that is how this originally worked, even though
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* I don't really see the use of that.
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*/
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GstSubParseFormat
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gst_sub_parse_data_format_autodetect (gchar * match_str)
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{
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guint n1, n2, n3;
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static GOnce mdvd_rx_once = G_ONCE_INIT;
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static GOnce subrip_rx_once = G_ONCE_INIT;
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static GOnce dks_rx_once = G_ONCE_INIT;
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static GOnce vtt_rx_once = G_ONCE_INIT;
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GRegex *mdvd_grx;
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GRegex *subrip_grx;
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GRegex *dks_grx;
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GRegex *vtt_grx;
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g_once (&mdvd_rx_once,
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(GThreadFunc) gst_sub_parse_data_format_autodetect_regex_once,
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(gpointer) GST_SUB_PARSE_REGEX_MDVDSUB);
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g_once (&subrip_rx_once,
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(GThreadFunc) gst_sub_parse_data_format_autodetect_regex_once,
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(gpointer) GST_SUB_PARSE_REGEX_SUBRIP);
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g_once (&dks_rx_once,
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(GThreadFunc) gst_sub_parse_data_format_autodetect_regex_once,
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(gpointer) GST_SUB_PARSE_REGEX_DKS);
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g_once (&vtt_rx_once,
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(GThreadFunc) gst_sub_parse_data_format_autodetect_regex_once,
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(gpointer) GST_SUB_PARSE_REGEX_VTT);
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mdvd_grx = (GRegex *) mdvd_rx_once.retval;
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subrip_grx = (GRegex *) subrip_rx_once.retval;
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dks_grx = (GRegex *) dks_rx_once.retval;
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vtt_grx = (GRegex *) vtt_rx_once.retval;
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if (g_regex_match (mdvd_grx, match_str, 0, NULL)) {
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GST_LOG ("MicroDVD (frame based) format detected");
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return GST_SUB_PARSE_FORMAT_MDVDSUB;
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}
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if (g_regex_match (subrip_grx, match_str, 0, NULL)) {
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GST_LOG ("SubRip (time based) format detected");
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return GST_SUB_PARSE_FORMAT_SUBRIP;
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}
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if (g_regex_match (dks_grx, match_str, 0, NULL)) {
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GST_LOG ("DKS (time based) format detected");
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return GST_SUB_PARSE_FORMAT_DKS;
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}
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if (g_regex_match (vtt_grx, match_str, 0, NULL) == TRUE) {
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GST_LOG ("WebVTT (time based) format detected");
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return GST_SUB_PARSE_FORMAT_VTT;
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}
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if (!strncmp (match_str, "FORMAT=TIME", 11)) {
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GST_LOG ("MPSub (time based) format detected");
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return GST_SUB_PARSE_FORMAT_MPSUB;
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}
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if (strstr (match_str, "<SAMI>") != NULL ||
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strstr (match_str, "<sami>") != NULL) {
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GST_LOG ("SAMI (time based) format detected");
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return GST_SUB_PARSE_FORMAT_SAMI;
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}
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/* we're boldly assuming the first subtitle appears within the first hour */
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if (sscanf (match_str, "0:%02u:%02u:", &n1, &n2) == 2 ||
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sscanf (match_str, "0:%02u:%02u=", &n1, &n2) == 2 ||
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sscanf (match_str, "00:%02u:%02u:", &n1, &n2) == 2 ||
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sscanf (match_str, "00:%02u:%02u=", &n1, &n2) == 2 ||
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sscanf (match_str, "00:%02u:%02u,%u=", &n1, &n2, &n3) == 3) {
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GST_LOG ("TMPlayer (time based) format detected");
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return GST_SUB_PARSE_FORMAT_TMPLAYER;
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}
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if (sscanf (match_str, "[%u][%u]", &n1, &n2) == 2) {
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GST_LOG ("MPL2 (time based) format detected");
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return GST_SUB_PARSE_FORMAT_MPL2;
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}
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if (strstr (match_str, "[INFORMATION]") != NULL) {
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GST_LOG ("SubViewer (time based) format detected");
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return GST_SUB_PARSE_FORMAT_SUBVIEWER;
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}
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if (strstr (match_str, "{QTtext}") != NULL) {
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GST_LOG ("QTtext (time based) format detected");
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return GST_SUB_PARSE_FORMAT_QTTEXT;
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}
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/* We assume the LRC file starts immediately */
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if (match_str[0] == '[') {
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gboolean all_lines_good = TRUE;
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gchar **split;
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gchar **ptr;
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ptr = split = g_strsplit (match_str, "\n", -1);
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while (*ptr && *(ptr + 1)) {
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gchar *str = *ptr;
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gint len = strlen (str);
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if (sscanf (str, "[%u:%02u.%02u]", &n1, &n2, &n3) == 3 ||
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sscanf (str, "[%u:%02u.%03u]", &n1, &n2, &n3) == 3) {
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all_lines_good = TRUE;
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} else if (len > 0 && str[len - 1] == ']' && strchr (str, ':') != NULL) {
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all_lines_good = TRUE;
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} else {
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all_lines_good = FALSE;
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break;
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}
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ptr++;
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}
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g_strfreev (split);
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if (all_lines_good)
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return GST_SUB_PARSE_FORMAT_LRC;
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}
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GST_DEBUG ("no subtitle format detected");
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return GST_SUB_PARSE_FORMAT_UNKNOWN;
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}
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gchar *
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gst_sub_parse_gst_convert_to_utf8 (const gchar * str, gsize len,
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const gchar * encoding, gsize * consumed, GError ** err)
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{
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gchar *ret = NULL;
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*consumed = 0;
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/* The char cast is necessary in glib < 2.24 */
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ret =
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g_convert_with_fallback (str, len, "UTF-8", encoding, (char *) "*",
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consumed, NULL, err);
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if (ret == NULL)
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return ret;
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/* + 3 to skip UTF-8 BOM if it was added */
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len = strlen (ret);
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if (len >= 3 && (guint8) ret[0] == 0xEF && (guint8) ret[1] == 0xBB
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&& (guint8) ret[2] == 0xBF)
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memmove (ret, ret + 3, len + 1 - 3);
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return ret;
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}
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gchar *
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gst_sub_parse_detect_encoding (const gchar * str, gsize len)
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{
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if (len >= 3 && (guint8) str[0] == 0xEF && (guint8) str[1] == 0xBB
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&& (guint8) str[2] == 0xBF)
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return g_strdup ("UTF-8");
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if (len >= 2 && (guint8) str[0] == 0xFE && (guint8) str[1] == 0xFF)
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return g_strdup ("UTF-16BE");
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if (len >= 2 && (guint8) str[0] == 0xFF && (guint8) str[1] == 0xFE)
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return g_strdup ("UTF-16LE");
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if (len >= 4 && (guint8) str[0] == 0x00 && (guint8) str[1] == 0x00
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&& (guint8) str[2] == 0xFE && (guint8) str[3] == 0xFF)
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return g_strdup ("UTF-32BE");
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if (len >= 4 && (guint8) str[0] == 0xFF && (guint8) str[1] == 0xFE
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&& (guint8) str[2] == 0x00 && (guint8) str[3] == 0x00)
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return g_strdup ("UTF-32LE");
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return NULL;
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}
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/*
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* Typefind support.
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*/
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/* FIXME 0.11: these caps are ugly, use app/x-subtitle + type field or so;
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* also, give different subtitle formats really different types */
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static GstStaticCaps mpl2_caps =
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GST_STATIC_CAPS ("application/x-subtitle-mpl2");
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#define SUB_CAPS (gst_static_caps_get (&sub_caps))
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static GstStaticCaps tmp_caps =
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GST_STATIC_CAPS ("application/x-subtitle-tmplayer");
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#define TMP_CAPS (gst_static_caps_get (&tmp_caps))
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static GstStaticCaps sub_caps = GST_STATIC_CAPS ("application/x-subtitle");
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#define MPL2_CAPS (gst_static_caps_get (&mpl2_caps))
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static GstStaticCaps smi_caps = GST_STATIC_CAPS ("application/x-subtitle-sami");
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#define SAMI_CAPS (gst_static_caps_get (&smi_caps))
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static GstStaticCaps dks_caps = GST_STATIC_CAPS ("application/x-subtitle-dks");
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#define DKS_CAPS (gst_static_caps_get (&dks_caps))
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static GstStaticCaps vtt_caps = GST_STATIC_CAPS ("application/x-subtitle-vtt");
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#define VTT_CAPS (gst_static_caps_get (&vtt_caps))
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static GstStaticCaps qttext_caps =
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GST_STATIC_CAPS ("application/x-subtitle-qttext");
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#define QTTEXT_CAPS (gst_static_caps_get (&qttext_caps))
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static GstStaticCaps lrc_caps = GST_STATIC_CAPS ("application/x-subtitle-lrc");
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#define LRC_CAPS (gst_static_caps_get (&lrc_caps))
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static void
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gst_sub_parse_type_find (GstTypeFind * tf, gpointer private)
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{
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GstSubParseFormat format;
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const guint8 *data;
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GstCaps *caps;
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gchar *str;
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gchar *encoding = NULL;
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const gchar *end;
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if (!(data = gst_type_find_peek (tf, 0, 129)))
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return;
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/* make sure string passed to _autodetect() is NUL-terminated */
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str = g_malloc0 (129);
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memcpy (str, data, 128);
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if ((encoding = gst_sub_parse_detect_encoding (str, 128)) != NULL) {
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gchar *converted_str;
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GError *err = NULL;
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gsize tmp;
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converted_str =
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gst_sub_parse_gst_convert_to_utf8 (str, 128, encoding, &tmp, &err);
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if (converted_str == NULL) {
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GST_DEBUG ("Encoding '%s' detected but conversion failed: %s", encoding,
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err->message);
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g_clear_error (&err);
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} else {
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g_free (str);
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str = converted_str;
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}
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g_free (encoding);
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}
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/* Check if at least the first 120 chars are valid UTF8,
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* otherwise convert as always */
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if (!g_utf8_validate (str, 128, &end) && (end - str) < 120) {
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gchar *converted_str;
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gsize tmp;
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const gchar *enc;
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enc = g_getenv ("GST_SUBTITLE_ENCODING");
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if (enc == NULL || *enc == '\0') {
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/* if local encoding is UTF-8 and no encoding specified
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* via the environment variable, assume ISO-8859-15 */
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if (g_get_charset (&enc)) {
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enc = "ISO-8859-15";
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}
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}
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converted_str =
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gst_sub_parse_gst_convert_to_utf8 (str, 128, enc, &tmp, NULL);
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if (converted_str != NULL) {
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g_free (str);
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str = converted_str;
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}
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}
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format = gst_sub_parse_data_format_autodetect (str);
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g_free (str);
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switch (format) {
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case GST_SUB_PARSE_FORMAT_MDVDSUB:
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GST_DEBUG ("MicroDVD format detected");
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caps = SUB_CAPS;
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break;
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case GST_SUB_PARSE_FORMAT_SUBRIP:
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GST_DEBUG ("SubRip format detected");
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caps = SUB_CAPS;
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break;
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case GST_SUB_PARSE_FORMAT_MPSUB:
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GST_DEBUG ("MPSub format detected");
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caps = SUB_CAPS;
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break;
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case GST_SUB_PARSE_FORMAT_SAMI:
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GST_DEBUG ("SAMI (time-based) format detected");
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caps = SAMI_CAPS;
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break;
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case GST_SUB_PARSE_FORMAT_TMPLAYER:
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GST_DEBUG ("TMPlayer (time based) format detected");
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caps = TMP_CAPS;
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break;
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/* FIXME: our MPL2 typefinding is not really good enough to warrant
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* returning a high probability (however, since we registered our
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* typefinder here with a rank of MARGINAL we should pretty much only
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* be called if most other typefinders have already run */
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case GST_SUB_PARSE_FORMAT_MPL2:
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GST_DEBUG ("MPL2 (time based) format detected");
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caps = MPL2_CAPS;
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break;
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case GST_SUB_PARSE_FORMAT_SUBVIEWER:
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GST_DEBUG ("SubViewer format detected");
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caps = SUB_CAPS;
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break;
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case GST_SUB_PARSE_FORMAT_DKS:
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GST_DEBUG ("DKS format detected");
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caps = DKS_CAPS;
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break;
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case GST_SUB_PARSE_FORMAT_QTTEXT:
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GST_DEBUG ("QTtext format detected");
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caps = QTTEXT_CAPS;
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break;
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case GST_SUB_PARSE_FORMAT_LRC:
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GST_DEBUG ("LRC format detected");
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caps = LRC_CAPS;
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break;
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case GST_SUB_PARSE_FORMAT_VTT:
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GST_DEBUG ("WebVTT format detected");
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caps = VTT_CAPS;
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break;
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default:
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case GST_SUB_PARSE_FORMAT_UNKNOWN:
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GST_DEBUG ("no subtitle format detected");
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return;
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}
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/* if we're here, it's ok */
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gst_type_find_suggest (tf, GST_TYPE_FIND_MAXIMUM, caps);
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}
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GST_TYPE_FIND_REGISTER_DEFINE (subparse, "subparse_typefind", GST_RANK_MARGINAL,
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gst_sub_parse_type_find, "srt,sub,mpsub,mdvd,smi,txt,dks,vtt", SUB_CAPS,
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NULL, NULL)
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gboolean
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sub_parse_element_init (GstPlugin * plugin)
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{
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static gsize res = FALSE;
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gboolean ret = TRUE;
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if (g_once_init_enter (&res)) {
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GST_DEBUG_CATEGORY_INIT (sub_parse_debug, "subparse", 0, ".sub parser");
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ret |= GST_TYPE_FIND_REGISTER (subparse, plugin);
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g_once_init_leave (&res, TRUE);
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}
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return ret;
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}
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