--- /dev/null
+/* GStreamer SAMI subtitle parser
+ * Copyright (c) 2006 Young-Ho Cha <ganadist at chollian net>
+ *
+ * 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., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#include "samiparse.h"
+
+#include <libxml/HTMLparser.h>
+#include <string.h>
+
+#define ITALIC_TAG 'i'
+#define SPAN_TAG 's'
+#define RUBY_TAG 'r'
+#define RT_TAG 't'
+#define CLEAR_TAG '0'
+
+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(). */
+ htmlParserCtxtPtr 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 */
+};
+
+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 xmlChar ** atts)
+{
+ int i;
+
+ sami_context_pop_state (sctx, CLEAR_TAG);
+ if (atts != NULL) {
+ for (i = 0; (atts[i] != NULL); i += 2) {
+ const xmlChar *key, *value;
+
+ key = atts[i];
+ value = atts[i + 1];
+
+ if (!value)
+ continue;
+ if (!xmlStrncmp ((const xmlChar *) "start", key, 5)) {
+ /* 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;
+ 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 xmlChar ** 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 xmlChar *key, *value;
+
+ key = atts[i];
+ value = atts[i + 1];
+
+ if (!value)
+ continue;
+ if (!xmlStrncmp ((const xmlChar *) "color", key, 5)) {
+ /*
+ * There are invalid color value in many
+ * sami files.
+ * It will fix hex color value that start without '#'
+ */
+ const gchar *sharp = "";
+ int len = xmlStrlen (value);
+
+ if (!(*value == '#' && len == 7)) {
+ gchar *r;
+
+ /* check if it looks like hex */
+ if (strtol ((const char *) value, &r, 16) >= 0 &&
+ ((xmlChar *) 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 (!xmlStrncasecmp (value, (const xmlChar *) "aqua", len)) {
+ value = (const xmlChar *) "#00ffff";
+ } else if (!xmlStrncasecmp (value, (const xmlChar *) "crimson", len)) {
+ value = (const xmlChar *) "#dc143c";
+ } else if (!xmlStrncasecmp (value, (const xmlChar *) "fuchsia", len)) {
+ value = (const xmlChar *) "#ff00ff";
+ } else if (!xmlStrncasecmp (value, (const xmlChar *) "indigo", len)) {
+ value = (const xmlChar *) "#4b0082";
+ } else if (!xmlStrncasecmp (value, (const xmlChar *) "lime", len)) {
+ value = (const xmlChar *) "#00ff00";
+ } else if (!xmlStrncasecmp (value, (const xmlChar *) "olive", len)) {
+ value = (const xmlChar *) "#808000";
+ } else if (!xmlStrncasecmp (value, (const xmlChar *) "silver", len)) {
+ value = (const xmlChar *) "#c0c0c0";
+ } else if (!xmlStrncasecmp (value, (const xmlChar *) "teal", len)) {
+ value = (const xmlChar *) "#008080";
+ }
+ g_string_append_printf (sctx->buf, " foreground=\"%s%s\"", sharp,
+ value);
+ } else if (!xmlStrncasecmp ((const xmlChar *) "face", key, 4)) {
+ 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
+start_sami_element (void *ctx, const xmlChar * name, const xmlChar ** atts)
+{
+ GstSamiContext *sctx = (GstSamiContext *) ctx;
+
+ GST_LOG ("name:%s", name);
+
+ if (!xmlStrncmp ((const xmlChar *) "sync", name, 4)) {
+ handle_start_sync (sctx, atts);
+ sctx->in_sync = TRUE;
+ } else if (!xmlStrncmp ((const xmlChar *) "font", name, 4)) {
+ handle_start_font (sctx, atts);
+ } else if (!xmlStrncmp ((const xmlChar *) "ruby", name, 4)) {
+ sami_context_push_state (sctx, RUBY_TAG);
+ } else if (!xmlStrncmp ((const xmlChar *) "br", name, 2)) {
+ g_string_append_c (sctx->buf, '\n');
+ /* FIXME: support for furigana/ruby once implemented in pango */
+ } else if (!xmlStrncmp ((const xmlChar *) "rt", name, 2)) {
+ 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 (!xmlStrncmp ((const xmlChar *) "p", name, 1)) {
+ } else if (!xmlStrncmp ((const xmlChar *) "i", name, 1)) {
+ g_string_append (sctx->buf, "<i>");
+ sami_context_push_state (sctx, ITALIC_TAG);
+ }
+}
+
+static void
+end_sami_element (void *ctx, const xmlChar * name)
+{
+ GstSamiContext *sctx = (GstSamiContext *) ctx;
+
+ GST_LOG ("name:%s", name);
+
+ if (!xmlStrncmp ((const xmlChar *) "sync", name, 4)) {
+ sctx->in_sync = FALSE;
+ } else if ((!xmlStrncmp ((const xmlChar *) "body", name, 4)) ||
+ (!xmlStrncmp ((const xmlChar *) "sami", name, 4))) {
+ /* 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 (!xmlStrncmp ((const xmlChar *) "font", name, 4)) {
+ sami_context_pop_state (sctx, SPAN_TAG);
+ } else if (!xmlStrncmp ((const xmlChar *) "ruby", name, 4)) {
+ sami_context_pop_state (sctx, RUBY_TAG);
+ } else if (!xmlStrncmp ((const xmlChar *) "i", name, 1)) {
+ sami_context_pop_state (sctx, ITALIC_TAG);
+ }
+}
+
+static void
+characters_sami (void *ctx, const xmlChar * ch, int len)
+{
+ GstSamiContext *sctx = (GstSamiContext *) ctx;
+ gchar *escaped;
+ gchar *tmp;
+ gint i;
+
+ /* Skip everything except content of the sync elements */
+ if (!sctx->in_sync)
+ return;
+
+ escaped = g_markup_escape_text ((const gchar *) ch, len);
+ g_strstrip (escaped);
+
+ /* Remove double spaces forom the string as those are
+ * usually added by newlines and indention */
+ tmp = escaped;
+ for (i = 0; i <= strlen (escaped); i++) {
+ escaped[i] = *tmp;
+ if (*tmp != ' ') {
+ tmp++;
+ continue;
+ }
+ while (*tmp == ' ')
+ tmp++;
+ }
+
+ if (has_tag (sctx->state, RT_TAG)) {
+ g_string_append_c (sctx->rubybuf, ' ');
+ g_string_append (sctx->rubybuf, escaped);
+ g_string_append_c (sctx->rubybuf, ' ');
+ } else {
+ g_string_append (sctx->buf, escaped);
+ }
+ g_free (escaped);
+}
+
+static xmlSAXHandler samiSAXHandlerStruct = {
+ NULL, /* internalSubset */
+ NULL, /* isStandalone */
+ NULL, /* hasInternalSubset */
+ NULL, /* hasExternalSubset */
+ NULL, /* resolveEntity */
+ NULL, /* getEntity */
+ NULL, /* entityDecl */
+ NULL, /* notationDecl */
+ NULL, /* attributeDecl */
+ NULL, /* elementDecl */
+ NULL, /* unparsedEntityDecl */
+ NULL, /* setDocumentLocator */
+ NULL, /* startDocument */
+ NULL, /* endDocument */
+ start_sami_element, /* startElement */
+ end_sami_element, /* endElement */
+ NULL, /* reference */
+ characters_sami, /* characters */
+ NULL, /* ignorableWhitespace */
+ NULL, /* processingInstruction */
+ NULL, /* comment */
+ NULL, /* xmlParserWarning */
+ NULL, /* xmlParserError */
+ NULL, /* xmlParserError */
+ NULL, /* getParameterEntity */
+ NULL, /* cdataBlock */
+ NULL, /* externalSubset */
+ 1, /* initialized */
+ NULL, /* private */
+ NULL, /* startElementNsSAX2Func */
+ NULL, /* endElementNsSAX2Func */
+ NULL /* xmlStructuredErrorFunc */
+};
+
+static xmlSAXHandlerPtr samiSAXHandler = &samiSAXHandlerStruct;
+
+void
+sami_context_init (ParserState * state)
+{
+ GstSamiContext *context;
+
+ g_assert (state->user_data == NULL);
+ state->user_data = (gpointer) g_new0 (GstSamiContext, 1);
+ context = (GstSamiContext *) state->user_data;
+
+ context->htmlctxt = htmlCreatePushParserCtxt (samiSAXHandler, context,
+ "", 0, NULL, XML_CHAR_ENCODING_UTF8);
+ context->buf = g_string_new ("");
+ context->rubybuf = g_string_new ("");
+ context->resultbuf = g_string_new ("");
+ context->state = g_string_new ("");
+}
+
+void
+sami_context_deinit (ParserState * state)
+{
+ GstSamiContext *context = (GstSamiContext *) state->user_data;
+
+ if (context) {
+ htmlParserCtxtPtr htmlctxt = context->htmlctxt;
+
+ /* destroy sax context */
+ htmlDocPtr doc;
+
+ htmlParseChunk (htmlctxt, "", 0, 1);
+ doc = htmlctxt->myDoc;
+ htmlFreeParserCtxt (htmlctxt);
+ context->htmlctxt = NULL;
+ if (doc)
+ xmlFreeDoc (doc);
+ 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;
+ }
+}
+
+static gchar *
+fix_invalid_entities (const gchar * line)
+{
+ const gchar *cp, *pp; /* current pointer, previous pointer */
+ gssize size;
+ GString *ret = g_string_new (NULL);
+
+ pp = line;
+ cp = strchr (line, '&');
+ while (cp) {
+ size = cp - pp;
+ ret = g_string_append_len (ret, pp, size);
+ cp++;
+ if (g_ascii_strncasecmp (cp, "nbsp;", 5)
+ && (!g_ascii_strncasecmp (cp, "nbsp", 4))) {
+ /* translate " " to " " */
+ ret = g_string_append_len (ret, " ", 6);
+ cp += 4;
+ } else if (g_ascii_strncasecmp (cp, "quot;", 5)
+ && g_ascii_strncasecmp (cp, "amp;", 4)
+ && g_ascii_strncasecmp (cp, "apos;", 5)
+ && g_ascii_strncasecmp (cp, "lt;", 3)
+ && g_ascii_strncasecmp (cp, "gt;", 3)
+ && g_ascii_strncasecmp (cp, "nbsp;", 5)
+ && cp[0] != '#') {
+ /* translate "&" to "&" */
+ ret = g_string_append_len (ret, "&", 5);
+ } else {
+ /* do not translate */
+ ret = g_string_append_c (ret, '&');
+ }
+
+ pp = cp;
+ cp = strchr (pp, '&');
+ }
+ ret = g_string_append (ret, pp);
+ return g_string_free (ret, FALSE);
+}
+
+gchar *
+parse_sami (ParserState * state, const gchar * line)
+{
+ gchar *fixed_line;
+ GstSamiContext *context = (GstSamiContext *) state->user_data;
+
+ fixed_line = fix_invalid_entities (line);
+ htmlParseChunk (context->htmlctxt, fixed_line, strlen (fixed_line), 0);
+ g_free (fixed_line);
+
+ if (context->has_result) {
+ gchar *r;
+
+ 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);
+ }
+
+ r = 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 r;
+ }
+ return NULL;
+}
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