gstreamer/gst/subparse/samiparse.c

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/* GStreamer SAMI subtitle parser
* Copyright (c) 2006, 2013 Young-Ho Cha <ganadist at gmail com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "samiparse.h"
#include <glib.h>
#include <string.h>
#include <stdlib.h>
#define ITALIC_TAG 'i'
#define SPAN_TAG 's'
#define RUBY_TAG 'r'
#define RT_TAG 't'
#define CLEAR_TAG '0'
typedef struct _HtmlParser HtmlParser;
typedef struct _HtmlContext HtmlContext;
typedef struct _GstSamiContext GstSamiContext;
struct _GstSamiContext
{
GString *buf; /* buffer to collect content */
GString *rubybuf; /* buffer to collect ruby content */
GString *resultbuf; /* when opening the next 'sync' tag, move
* from 'buf' to avoid to append following
* content */
GString *state; /* in many sami files there are tags that
* are not closed, so for each open tag the
* parser will append a tag flag here so
* that tags can be closed properly on
* 'sync' tags. See _context_push_state()
* and _context_pop_state(). */
HtmlContext *htmlctxt; /* html parser context */
gboolean has_result; /* set when ready to push out result */
gboolean in_sync; /* flag to avoid appending anything except the
* content of the sync elements to buf */
guint64 time1; /* previous start attribute in sync tag */
guint64 time2; /* current start attribute in sync tag */
};
struct _HtmlParser
{
void (*start_element) (HtmlContext * ctx,
const gchar * name, const gchar ** attr, gpointer user_data);
void (*end_element) (HtmlContext * ctx,
const gchar * name, gpointer user_data);
void (*text) (HtmlContext * ctx,
const gchar * text, gsize text_len, gpointer user_data);
};
struct _HtmlContext
{
const HtmlParser *parser;
gpointer user_data;
GString *buf;
};
static HtmlContext *
html_context_new (HtmlParser * parser, gpointer user_data)
{
HtmlContext *ctxt = (HtmlContext *) g_new0 (HtmlContext, 1);
ctxt->parser = parser;
ctxt->user_data = user_data;
ctxt->buf = g_string_new (NULL);
return ctxt;
}
static void
html_context_free (HtmlContext * ctxt)
{
g_string_free (ctxt->buf, TRUE);
g_free (ctxt);
}
struct EntityMap
{
const gunichar unescaped;
const gchar *escaped;
};
struct EntityMap XmlEntities[] = {
{34, "quot;"},
{38, "amp;"},
{39, "apos;"},
{60, "lt;"},
{62, "gt;"},
{0, NULL},
};
struct EntityMap HtmlEntities[] = {
/* nbsp will handle manually
{ 160, "nbsp;" }, */
{161, "iexcl;"},
{162, "cent;"},
{163, "pound;"},
{164, "curren;"},
{165, "yen;"},
{166, "brvbar;"},
{167, "sect;"},
{168, "uml;"},
{169, "copy;"},
{170, "ordf;"},
{171, "laquo;"},
{172, "not;"},
{173, "shy;"},
{174, "reg;"},
{175, "macr;"},
{176, "deg;"},
{177, "plusmn;"},
{178, "sup2;"},
{179, "sup3;"},
{180, "acute;"},
{181, "micro;"},
{182, "para;"},
{183, "middot;"},
{184, "cedil;"},
{185, "sup1;"},
{186, "ordm;"},
{187, "raquo;"},
{188, "frac14;"},
{189, "frac12;"},
{190, "frac34;"},
{191, "iquest;"},
{192, "Agrave;"},
{193, "Aacute;"},
{194, "Acirc;"},
{195, "Atilde;"},
{196, "Auml;"},
{197, "Aring;"},
{198, "AElig;"},
{199, "Ccedil;"},
{200, "Egrave;"},
{201, "Eacute;"},
{202, "Ecirc;"},
{203, "Euml;"},
{204, "Igrave;"},
{205, "Iacute;"},
{206, "Icirc;"},
{207, "Iuml;"},
{208, "ETH;"},
{209, "Ntilde;"},
{210, "Ograve;"},
{211, "Oacute;"},
{212, "Ocirc;"},
{213, "Otilde;"},
{214, "Ouml;"},
{215, "times;"},
{216, "Oslash;"},
{217, "Ugrave;"},
{218, "Uacute;"},
{219, "Ucirc;"},
{220, "Uuml;"},
{221, "Yacute;"},
{222, "THORN;"},
{223, "szlig;"},
{224, "agrave;"},
{225, "aacute;"},
{226, "acirc;"},
{227, "atilde;"},
{228, "auml;"},
{229, "aring;"},
{230, "aelig;"},
{231, "ccedil;"},
{232, "egrave;"},
{233, "eacute;"},
{234, "ecirc;"},
{235, "euml;"},
{236, "igrave;"},
{237, "iacute;"},
{238, "icirc;"},
{239, "iuml;"},
{240, "eth;"},
{241, "ntilde;"},
{242, "ograve;"},
{243, "oacute;"},
{244, "ocirc;"},
{245, "otilde;"},
{246, "ouml;"},
{247, "divide;"},
{248, "oslash;"},
{249, "ugrave;"},
{250, "uacute;"},
{251, "ucirc;"},
{252, "uuml;"},
{253, "yacute;"},
{254, "thorn;"},
{255, "yuml;"},
{338, "OElig;"},
{339, "oelig;"},
{352, "Scaron;"},
{353, "scaron;"},
{376, "Yuml;"},
{402, "fnof;"},
{710, "circ;"},
{732, "tilde;"},
{913, "Alpha;"},
{914, "Beta;"},
{915, "Gamma;"},
{916, "Delta;"},
{917, "Epsilon;"},
{918, "Zeta;"},
{919, "Eta;"},
{920, "Theta;"},
{921, "Iota;"},
{922, "Kappa;"},
{923, "Lambda;"},
{924, "Mu;"},
{925, "Nu;"},
{926, "Xi;"},
{927, "Omicron;"},
{928, "Pi;"},
{929, "Rho;"},
{931, "Sigma;"},
{932, "Tau;"},
{933, "Upsilon;"},
{934, "Phi;"},
{935, "Chi;"},
{936, "Psi;"},
{937, "Omega;"},
{945, "alpha;"},
{946, "beta;"},
{947, "gamma;"},
{948, "delta;"},
{949, "epsilon;"},
{950, "zeta;"},
{951, "eta;"},
{952, "theta;"},
{953, "iota;"},
{954, "kappa;"},
{955, "lambda;"},
{956, "mu;"},
{957, "nu;"},
{958, "xi;"},
{959, "omicron;"},
{960, "pi;"},
{961, "rho;"},
{962, "sigmaf;"},
{963, "sigma;"},
{964, "tau;"},
{965, "upsilon;"},
{966, "phi;"},
{967, "chi;"},
{968, "psi;"},
{969, "omega;"},
{977, "thetasym;"},
{978, "upsih;"},
{982, "piv;"},
{8194, "ensp;"},
{8195, "emsp;"},
{8201, "thinsp;"},
{8204, "zwnj;"},
{8205, "zwj;"},
{8206, "lrm;"},
{8207, "rlm;"},
{8211, "ndash;"},
{8212, "mdash;"},
{8216, "lsquo;"},
{8217, "rsquo;"},
{8218, "sbquo;"},
{8220, "ldquo;"},
{8221, "rdquo;"},
{8222, "bdquo;"},
{8224, "dagger;"},
{8225, "Dagger;"},
{8226, "bull;"},
{8230, "hellip;"},
{8240, "permil;"},
{8242, "prime;"},
{8243, "Prime;"},
{8249, "lsaquo;"},
{8250, "rsaquo;"},
{8254, "oline;"},
{8260, "frasl;"},
{8364, "euro;"},
{8465, "image;"},
{8472, "weierp;"},
{8476, "real;"},
{8482, "trade;"},
{8501, "alefsym;"},
{8592, "larr;"},
{8593, "uarr;"},
{8594, "rarr;"},
{8595, "darr;"},
{8596, "harr;"},
{8629, "crarr;"},
{8656, "lArr;"},
{8657, "uArr;"},
{8658, "rArr;"},
{8659, "dArr;"},
{8660, "hArr;"},
{8704, "forall;"},
{8706, "part;"},
{8707, "exist;"},
{8709, "empty;"},
{8711, "nabla;"},
{8712, "isin;"},
{8713, "notin;"},
{8715, "ni;"},
{8719, "prod;"},
{8721, "sum;"},
{8722, "minus;"},
{8727, "lowast;"},
{8730, "radic;"},
{8733, "prop;"},
{8734, "infin;"},
{8736, "ang;"},
{8743, "and;"},
{8744, "or;"},
{8745, "cap;"},
{8746, "cup;"},
{8747, "int;"},
{8756, "there4;"},
{8764, "sim;"},
{8773, "cong;"},
{8776, "asymp;"},
{8800, "ne;"},
{8801, "equiv;"},
{8804, "le;"},
{8805, "ge;"},
{8834, "sub;"},
{8835, "sup;"},
{8836, "nsub;"},
{8838, "sube;"},
{8839, "supe;"},
{8853, "oplus;"},
{8855, "otimes;"},
{8869, "perp;"},
{8901, "sdot;"},
{8968, "lceil;"},
{8969, "rceil;"},
{8970, "lfloor;"},
{8971, "rfloor;"},
{9001, "lang;"},
{9002, "rang;"},
{9674, "loz;"},
{9824, "spades;"},
{9827, "clubs;"},
{9829, "hearts;"},
{9830, "diams;"},
{0, NULL},
};
static gchar *
unescape_string (const gchar * text)
{
gint i;
GString *unescaped = g_string_new (NULL);
while (*text) {
if (*text == '&') {
text++;
/* unescape &nbsp and &nbsp; */
if (!g_ascii_strncasecmp (text, "nbsp", 4)) {
unescaped = g_string_append_unichar (unescaped, 160);
text += 4;
if (*text == ';') {
text++;
}
goto next;
}
/* pass xml entities. these will be processed as pango markup */
for (i = 0; XmlEntities[i].escaped; i++) {
gssize len = strlen (XmlEntities[i].escaped);
if (!g_ascii_strncasecmp (text, XmlEntities[i].escaped, len)) {
unescaped = g_string_append_c (unescaped, '&');
unescaped =
g_string_append_len (unescaped, XmlEntities[i].escaped, len);
text += len;
goto next;
}
}
/* convert html entities */
for (i = 0; HtmlEntities[i].escaped; i++) {
gssize len = strlen (HtmlEntities[i].escaped);
if (!strncmp (text, HtmlEntities[i].escaped, len)) {
unescaped =
g_string_append_unichar (unescaped, HtmlEntities[i].unescaped);
text += len;
goto next;
}
}
if (*text == '#') {
gboolean is_hex = FALSE;
gunichar l;
gchar *end = NULL;
text++;
if (*text == 'x') {
is_hex = TRUE;
text++;
}
errno = 0;
if (is_hex) {
l = strtoul (text, &end, 16);
} else {
l = strtoul (text, &end, 10);
}
if (text == end || errno != 0) {
/* error occured. pass it */
goto next;
}
unescaped = g_string_append_unichar (unescaped, l);
text = end;
if (*text == ';') {
text++;
}
goto next;
}
/* escape & */
unescaped = g_string_append (unescaped, "&amp;");
next:
continue;
} else if (g_ascii_isspace (*text)) {
unescaped = g_string_append_c (unescaped, ' ');
/* strip whitespace */
do {
text++;
} while ((*text) && g_ascii_isspace (*text));
} else {
unescaped = g_string_append_c (unescaped, *text);
text++;
}
}
return g_string_free (unescaped, FALSE);
}
static const gchar *
string_token (const gchar * string, const gchar * delimiter, gchar ** first)
{
gchar *next = strstr (string, delimiter);
if (next) {
*first = g_strndup (string, next - string);
} else {
*first = g_strdup (string);
}
return next;
}
static void
html_context_handle_element (HtmlContext * ctxt,
const gchar * string, gboolean must_close)
{
gchar *name = NULL;
gint count = 0, i;
gchar **attrs;
const gchar *found, *next;
/* split element name and attributes */
next = string_token (string, " ", &name);
if (next) {
/* count attributes */
found = next + 1;
while (TRUE) {
found = strchr (found, '=');
if (!found)
break;
found++;
count++;
}
} else {
count = 0;
}
attrs = g_new0 (gchar *, (count + 1) * 2);
for (i = 0; i < count && next != NULL; i += 2) {
gchar *attr_name = NULL, *attr_value = NULL;
gsize length;
next = string_token (next + 1, "=", &attr_name);
next = string_token (next + 1, " ", &attr_value);
/* strip " or ' from attribute value */
if (attr_value[0] == '"' || attr_value[0] == '\'') {
gchar *tmp = g_strdup (attr_value + 1);
g_free (attr_value);
attr_value = tmp;
}
length = strlen (attr_value);
if (attr_value[length - 1] == '"' || attr_value[length - 1] == '\'') {
attr_value[length - 1] = '\0';
}
attrs[i] = attr_name;
attrs[i + 1] = attr_value;
}
ctxt->parser->start_element (ctxt, name,
(const gchar **) attrs, ctxt->user_data);
if (must_close) {
ctxt->parser->end_element (ctxt, name, ctxt->user_data);
}
g_strfreev (attrs);
g_free (name);
}
static void
html_context_parse (HtmlContext * ctxt, gchar * text, gsize text_len)
{
const gchar *next = NULL;
ctxt->buf = g_string_append_len (ctxt->buf, text, text_len);
next = ctxt->buf->str;
while (TRUE) {
if (next[0] == '<') {
gchar *element = NULL;
/* find <blahblah> */
if (!strchr (next, '>')) {
/* no tag end point. buffer will be process in next time */
return;
}
next = string_token (next, ">", &element);
next++;
if (g_str_has_suffix (next, "/")) {
/* handle <blah/> */
element[strlen (element) - 1] = '\0';
html_context_handle_element (ctxt, element + 1, TRUE);
} else if (element[1] == '/') {
/* handle </blah> */
ctxt->parser->end_element (ctxt, element + 2, ctxt->user_data);
} else {
/* handle <blah> */
html_context_handle_element (ctxt, element + 1, FALSE);
}
g_free (element);
} else if (strchr (next, '<')) {
gchar *text = NULL;
gsize length;
next = string_token (next, "<", &text);
text = g_strstrip (text);
length = strlen (text);
ctxt->parser->text (ctxt, text, length, ctxt->user_data);
g_free (text);
} else {
gchar *text = (gchar *) next;
gsize length;
text = g_strstrip (text);
length = strlen (text);
ctxt->parser->text (ctxt, text, length, ctxt->user_data);
ctxt->buf = g_string_assign (ctxt->buf, "");
return;
}
}
ctxt->buf = g_string_assign (ctxt->buf, next);
}
static gchar *
has_tag (GString * str, const gchar tag)
{
return strrchr (str->str, tag);
}
static void
sami_context_push_state (GstSamiContext * sctx, char state)
{
GST_LOG ("state %c", state);
g_string_append_c (sctx->state, state);
}
static void
sami_context_pop_state (GstSamiContext * sctx, char state)
{
GString *str = g_string_new ("");
GString *context_state = sctx->state;
int i;
GST_LOG ("state %c", state);
for (i = context_state->len - 1; i >= 0; i--) {
switch (context_state->str[i]) {
case ITALIC_TAG: /* <i> */
{
g_string_append (str, "</i>");
break;
}
case SPAN_TAG: /* <span foreground= > */
{
g_string_append (str, "</span>");
break;
}
case RUBY_TAG: /* <span size= > -- ruby */
{
break;
}
case RT_TAG: /* ruby */
{
/* FIXME: support for furigana/ruby once implemented in pango */
g_string_append (sctx->rubybuf, "</span>");
if (has_tag (context_state, ITALIC_TAG)) {
g_string_append (sctx->rubybuf, "</i>");
}
break;
}
default:
break;
}
if (context_state->str[i] == state) {
g_string_append (sctx->buf, str->str);
g_string_free (str, TRUE);
g_string_truncate (context_state, i);
return;
}
}
if (state == CLEAR_TAG) {
g_string_append (sctx->buf, str->str);
g_string_truncate (context_state, 0);
}
g_string_free (str, TRUE);
}
static void
handle_start_sync (GstSamiContext * sctx, const gchar ** atts)
{
int i;
sami_context_pop_state (sctx, CLEAR_TAG);
if (atts != NULL) {
for (i = 0; (atts[i] != NULL); i += 2) {
const gchar *key, *value;
key = atts[i];
value = atts[i + 1];
if (!value)
continue;
if (!g_ascii_strcasecmp ("start", key)) {
/* Only set a new start time if we don't have text pending */
if (sctx->resultbuf->len == 0)
sctx->time1 = sctx->time2;
sctx->time2 = atoi ((const char *) value) * GST_MSECOND;
sctx->time2 = MAX (sctx->time2, sctx->time1);
g_string_append (sctx->resultbuf, sctx->buf->str);
sctx->has_result = (sctx->resultbuf->len != 0) ? TRUE : FALSE;
g_string_truncate (sctx->buf, 0);
}
}
}
}
static void
handle_start_font (GstSamiContext * sctx, const gchar ** atts)
{
int i;
sami_context_pop_state (sctx, SPAN_TAG);
if (atts != NULL) {
g_string_append (sctx->buf, "<span");
for (i = 0; (atts[i] != NULL); i += 2) {
const gchar *key, *value;
key = atts[i];
value = atts[i + 1];
if (!value)
continue;
if (!g_ascii_strcasecmp ("color", key)) {
/*
* There are invalid color value in many
* sami files.
* It will fix hex color value that start without '#'
*/
const gchar *sharp = "";
int len = strlen (value);
if (!(*value == '#' && len == 7)) {
gchar *r;
/* check if it looks like hex */
if (strtol ((const char *) value, &r, 16) >= 0 &&
((gchar *) r == (value + 6) && len == 6)) {
sharp = "#";
}
}
/* some colours can be found in many sami files, but X RGB database
* doesn't contain a colour by this name, so map explicitly */
if (!g_ascii_strcasecmp ("aqua", value)) {
value = "#00ffff";
} else if (!g_ascii_strcasecmp ("crimson", value)) {
value = "#dc143c";
} else if (!g_ascii_strcasecmp ("fuchsia", value)) {
value = "#ff00ff";
} else if (!g_ascii_strcasecmp ("indigo", value)) {
value = "#4b0082";
} else if (!g_ascii_strcasecmp ("lime", value)) {
value = "#00ff00";
} else if (!g_ascii_strcasecmp ("olive", value)) {
value = "#808000";
} else if (!g_ascii_strcasecmp ("silver", value)) {
value = "#c0c0c0";
} else if (!g_ascii_strcasecmp ("teal", value)) {
value = "#008080";
}
g_string_append_printf (sctx->buf, " foreground=\"%s%s\"", sharp,
value);
} else if (!g_ascii_strcasecmp ("face", key)) {
g_string_append_printf (sctx->buf, " font_family=\"%s\"", value);
}
}
g_string_append_c (sctx->buf, '>');
sami_context_push_state (sctx, SPAN_TAG);
}
}
static void
handle_start_element (HtmlContext * ctx, const gchar * name,
const char **atts, gpointer user_data)
{
GstSamiContext *sctx = (GstSamiContext *) user_data;
GST_LOG ("name:%s", name);
if (!g_ascii_strcasecmp ("sync", name)) {
handle_start_sync (sctx, atts);
sctx->in_sync = TRUE;
} else if (!g_ascii_strcasecmp ("font", name)) {
handle_start_font (sctx, atts);
} else if (!g_ascii_strcasecmp ("ruby", name)) {
sami_context_push_state (sctx, RUBY_TAG);
} else if (!g_ascii_strcasecmp ("br", name)) {
g_string_append_c (sctx->buf, '\n');
/* FIXME: support for furigana/ruby once implemented in pango */
} else if (!g_ascii_strcasecmp ("rt", name)) {
if (has_tag (sctx->state, ITALIC_TAG)) {
g_string_append (sctx->rubybuf, "<i>");
}
g_string_append (sctx->rubybuf, "<span size='xx-small' rise='-100'>");
sami_context_push_state (sctx, RT_TAG);
} else if (!g_ascii_strcasecmp ("i", name)) {
g_string_append (sctx->buf, "<i>");
sami_context_push_state (sctx, ITALIC_TAG);
} else if (!g_ascii_strcasecmp ("p", name)) {
}
}
static void
handle_end_element (HtmlContext * ctx, const char *name, gpointer user_data)
{
GstSamiContext *sctx = (GstSamiContext *) user_data;
GST_LOG ("name:%s", name);
if (!g_ascii_strcasecmp ("sync", name)) {
sctx->in_sync = FALSE;
} else if ((!g_ascii_strcasecmp ("body", name)) ||
(!g_ascii_strcasecmp ("sami", name))) {
/* We will usually have one buffer left when the body is closed
* as we need the next sync to actually send it */
if (sctx->buf->len != 0) {
/* Only set a new start time if we don't have text pending */
if (sctx->resultbuf->len == 0)
sctx->time1 = sctx->time2;
sctx->time2 = GST_CLOCK_TIME_NONE;
g_string_append (sctx->resultbuf, sctx->buf->str);
sctx->has_result = (sctx->resultbuf->len != 0) ? TRUE : FALSE;
g_string_truncate (sctx->buf, 0);
}
} else if (!g_ascii_strcasecmp ("font", name)) {
sami_context_pop_state (sctx, SPAN_TAG);
} else if (!g_ascii_strcasecmp ("ruby", name)) {
sami_context_pop_state (sctx, RUBY_TAG);
} else if (!g_ascii_strcasecmp ("i", name)) {
sami_context_pop_state (sctx, ITALIC_TAG);
}
}
static void
handle_text (HtmlContext * ctx, const gchar * text, gsize text_len,
gpointer user_data)
{
GstSamiContext *sctx = (GstSamiContext *) user_data;
/* Skip everything except content of the sync elements */
if (!sctx->in_sync)
return;
if (has_tag (sctx->state, RT_TAG)) {
g_string_append_c (sctx->rubybuf, ' ');
g_string_append (sctx->rubybuf, text);
g_string_append_c (sctx->rubybuf, ' ');
} else {
g_string_append (sctx->buf, text);
}
}
static HtmlParser samiParser = {
handle_start_element, /* start_element */
handle_end_element, /* end_element */
handle_text, /* text */
};
2009-08-04 12:29:41 +00:00
void
sami_context_init (ParserState * state)
{
GstSamiContext *context;
g_assert (state->user_data == NULL);
context = g_new0 (GstSamiContext, 1);
context->htmlctxt = html_context_new (&samiParser, context);
context->buf = g_string_new ("");
context->rubybuf = g_string_new ("");
context->resultbuf = g_string_new ("");
context->state = g_string_new ("");
state->user_data = context;
}
void
sami_context_deinit (ParserState * state)
{
GstSamiContext *context = (GstSamiContext *) state->user_data;
if (context) {
html_context_free (context->htmlctxt);
context->htmlctxt = NULL;
g_string_free (context->buf, TRUE);
g_string_free (context->rubybuf, TRUE);
g_string_free (context->resultbuf, TRUE);
g_string_free (context->state, TRUE);
g_free (context);
state->user_data = NULL;
}
}
void
sami_context_reset (ParserState * state)
{
GstSamiContext *context = (GstSamiContext *) state->user_data;
if (context) {
g_string_truncate (context->buf, 0);
g_string_truncate (context->rubybuf, 0);
g_string_truncate (context->resultbuf, 0);
g_string_truncate (context->state, 0);
context->has_result = FALSE;
context->in_sync = FALSE;
context->time1 = 0;
context->time2 = 0;
}
}
gchar *
parse_sami (ParserState * state, const gchar * line)
{
gchar *ret = NULL;
GstSamiContext *context = (GstSamiContext *) state->user_data;
gchar *unescaped = unescape_string (line);
html_context_parse (context->htmlctxt, (gchar *) unescaped,
strlen (unescaped));
g_free (unescaped);
if (context->has_result) {
if (context->rubybuf->len) {
context->rubybuf = g_string_append_c (context->rubybuf, '\n');
g_string_prepend (context->resultbuf, context->rubybuf->str);
context->rubybuf = g_string_truncate (context->rubybuf, 0);
}
ret = g_string_free (context->resultbuf, FALSE);
context->resultbuf = g_string_new ("");
state->start_time = context->time1;
state->duration = context->time2 - context->time1;
context->has_result = FALSE;
}
return ret;
}