--- /dev/null
+/* GStreamer QTtext subtitle parser
+ * Copyright (c) 2009 Thiago Santos <thiago.sousa.santos collabora co uk>>
+ *
+ * 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.
+ */
+
+/* References:
+ * http://www.apple.com/quicktime/tutorials/texttracks.html
+ * http://www.apple.com/quicktime/tutorials/textdescriptors.html
+ */
+
+#include "qttextparse.h"
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+#define MIN_TO_NSEC (60 * GST_SECOND)
+#define HOUR_TO_NSEC (60 * MIN_TO_NSEC)
+
+#define GST_QTTEXT_CONTEXT(state) ((GstQTTextContext *) (state)->user_data)
+
+typedef struct _GstQTTextContext GstQTTextContext;
+
+struct _GstQTTextContext
+{
+ /* timing variables */
+ gint timescale;
+ gboolean absolute;
+ guint64 start_time;
+
+ gboolean markup_open;
+ gboolean need_markup;
+
+ gchar *font;
+ gint font_size;
+ gchar *bg_color;
+ gchar *fg_color;
+
+ gboolean bold;
+ gboolean italic;
+};
+
+void
+qttext_context_init (ParserState * state)
+{
+ GstQTTextContext *context;
+
+ state->user_data = g_new0 (GstQTTextContext, 1);
+
+ context = GST_QTTEXT_CONTEXT (state);
+
+ /* we use 1000 as a default */
+ context->timescale = 1000;
+ context->absolute = TRUE;
+
+ context->markup_open = FALSE;
+ context->need_markup = FALSE;
+
+ context->font_size = 12;
+}
+
+void
+qttext_context_deinit (ParserState * state)
+{
+ if (state->user_data != NULL) {
+ GstQTTextContext *context = GST_QTTEXT_CONTEXT (state);
+ g_free (context->font);
+ g_free (context->bg_color);
+ g_free (context->fg_color);
+
+ g_free (state->user_data);
+ state->user_data = NULL;
+ }
+}
+
+/*
+ * Reads the string right after the ':'
+ */
+static gchar *
+read_str (const gchar * line, const gchar * end)
+{
+ gint index = 0;
+
+ while (line[index] != ':' && line[index] != '}') {
+ index++;
+ }
+ if (line[index] != ':')
+ return NULL;
+ index++;
+ while (line[index] == ' ')
+ index++;
+
+ return g_strndup (line + index, (end - (line + index)));
+}
+
+/* search for the ':' and parse the number right after it */
+static gint
+read_int (const gchar * line)
+{
+ gint index = 0;
+ while (line[index] != ':' && line[index] != '}') {
+ index++;
+ }
+ if (line[index] != ':')
+ return 0;
+ index++;
+ return atoi (line + index);
+}
+
+/* skip the ':' and then match the following string
+ * with 'match', but only if it before 'upto' */
+static gboolean
+string_match (const gchar * line, const gchar * match, const gchar * upto)
+{
+ gchar *result = strstr (line, match);
+ return (result < upto);
+}
+
+/*
+ * Reads the color values and stores them in r, g and b.
+ */
+static gboolean
+read_color (const gchar * line, gint * r, gint * g, gint * b)
+{
+ gint index = 0;
+ while (line[index] != ':' && line[index] != '}') {
+ index++;
+ }
+ if (line[index] != ':')
+ return FALSE;
+ index++;
+
+ *r = atoi (line + index);
+
+ while (line[index] != '}' && line[index] != ',') {
+ index++;
+ }
+ if (line[index] != ',')
+ return FALSE;
+ index++;
+
+ *g = atoi (line + index);
+
+ while (line[index] != '}' && line[index] != ',') {
+ index++;
+ }
+ if (line[index] != ',')
+ return FALSE;
+ index++;
+
+ *b = atoi (line + index);
+
+ return TRUE;
+}
+
+static gchar *
+make_color (gint r, gint g, gint b)
+{
+ /* qttext goes up to 65535, while pango goes to 255 */
+ r /= 256;
+ g /= 256;
+ b /= 256;
+ return g_strdup_printf ("#%02X%02X%02X", r, g, b);
+}
+
+static gboolean
+qttext_parse_tag (ParserState * state, const gchar * line, gint * index)
+{
+ gchar *next;
+ gint next_index;
+ gint aux;
+ gchar *str;
+ gint r, g, b;
+ GstQTTextContext *context = GST_QTTEXT_CONTEXT (state);
+
+ g_assert (line[*index] == '{');
+
+ next = strchr (line + *index, '}');
+ if (next == NULL) {
+ goto error_out;
+ } else {
+ next_index = 1 + (next - line);
+ }
+ g_assert (line[next_index - 1] == '}');
+
+ *index = *index + 1; /* skip the { */
+
+ /* now identify our tag */
+ /* FIXME: those should be case unsensitive */
+ /* TODO: there are other tags that could be added here */
+ if (strncmp (line + *index, "QTtext", 6) == 0) {
+ /* NOP */
+
+ } else if (strncmp (line + *index, "font", 4) == 0) {
+ str = read_str (line + *index + 4, line + next_index - 1);
+ if (str) {
+ g_free (context->font);
+ context->font = str;
+ context->need_markup = TRUE;
+ GST_DEBUG ("Setting qttext font to %s", str);
+ } else {
+ GST_WARNING ("Failed to parse qttext font at line: %s", line);
+ }
+
+ } else if (strncmp (line + *index, "size", 4) == 0) {
+ aux = read_int (line + *index + 4);
+ if (aux == 0) {
+ GST_WARNING ("Invalid size at line %s, using 12", line);
+ context->font_size = 12;
+ } else {
+ GST_DEBUG ("Setting qttext font-size to: %d", aux);
+ context->font_size = aux;
+ }
+ context->need_markup = TRUE;
+
+ } else if (strncmp (line + *index, "textColor", 9) == 0) {
+ if (read_color (line + *index + 9, &r, &g, &b)) {
+ context->fg_color = make_color (r, g, b);
+ GST_DEBUG ("Setting qttext fg color to %s", context->fg_color);
+ } else {
+ GST_WARNING ("Failed to read textColor at line %s", line);
+ }
+ context->need_markup = TRUE;
+
+ } else if (strncmp (line + *index, "backColor", 9) == 0) {
+ if (read_color (line + *index + 9, &r, &g, &b)) {
+ context->bg_color = make_color (r, g, b);
+ GST_DEBUG ("Setting qttext bg color to %s", context->bg_color);
+ } else {
+ GST_WARNING ("Failed to read backColor at line %s, disabling", line);
+ g_free (context->bg_color);
+ context->bg_color = NULL;
+ }
+ context->need_markup = TRUE;
+
+ } else if (strncmp (line + *index, "plain", 5) == 0) {
+ context->bold = FALSE;
+ context->italic = FALSE;
+ context->need_markup = TRUE;
+ GST_DEBUG ("Setting qttext style to plain");
+
+ } else if (strncmp (line + *index, "bold", 4) == 0) {
+ context->bold = TRUE;
+ context->italic = FALSE;
+ context->need_markup = TRUE;
+ GST_DEBUG ("Setting qttext style to bold");
+
+ } else if (strncmp (line + *index, "italic", 6) == 0) {
+ context->bold = FALSE;
+ context->italic = TRUE;
+ context->need_markup = TRUE;
+ GST_DEBUG ("Setting qttext style to italic");
+
+ } else if (strncmp (line + *index, "timescale", 9) == 0) {
+ aux = read_int (line + *index + 9);
+ if (aux == 0) {
+ GST_WARNING ("Couldn't interpret timescale at line %s, using 1000", line);
+ context->timescale = 1000;
+ } else {
+ GST_DEBUG ("Setting qttext timescale to: %d", aux);
+ context->timescale = aux;
+ }
+
+ } else if (strncmp (line + *index, "timestamps", 10) == 0) {
+ if (string_match (line + *index + 10, "relative", line + next_index)) {
+ GST_DEBUG ("Setting qttext timestamps to relative");
+ context->absolute = FALSE;
+ } else {
+ /* call it absolute otherwise */
+ GST_DEBUG ("Setting qttext timestamps to absolute");
+ context->absolute = TRUE;
+ }
+
+ } else {
+ GST_WARNING ("Unused qttext tag starting at: %s", line + *index);
+ }
+
+ *index = next_index;
+ return TRUE;
+
+error_out:
+ {
+ GST_WARNING ("Failed to parse qttext tag at line %s", line);
+ return FALSE;
+ }
+}
+
+static guint64
+qttext_parse_timestamp (ParserState * state, const gchar * line, gint index)
+{
+ int ret;
+ gint hour, min, sec, dec;
+ GstQTTextContext *context = GST_QTTEXT_CONTEXT (state);
+
+ ret = sscanf (line + index, "[%d:%d:%d.%d]", &hour, &min, &sec, &dec);
+ if (ret != 3 && ret != 4) {
+ /* bad timestamp */
+ GST_WARNING ("Bad qttext timestamp found: %s", line);
+ return 0;
+ }
+
+ if (ret == 3) {
+ /* be forgiving for missing decimal part */
+ dec = 0;
+ }
+
+ /* parse the decimal part according to the timescale */
+ g_assert (context->timescale != 0);
+ dec = (GST_SECOND * dec) / context->timescale;
+
+ /* return the result */
+ return hour * HOUR_TO_NSEC + min * MIN_TO_NSEC + sec * GST_SECOND + dec;
+}
+
+static void
+qttext_open_markup (ParserState * state)
+{
+ GstQTTextContext *context = GST_QTTEXT_CONTEXT (state);
+
+ g_string_append (state->buf, "<span");
+
+ /* add your markup tags here */
+ if (context->font)
+ g_string_append_printf (state->buf, " font='%s %d'", context->font,
+ context->font_size);
+ else
+ g_string_append_printf (state->buf, " font='%d'", context->font_size);
+
+ if (context->bg_color)
+ g_string_append_printf (state->buf, " bgcolor='%s'", context->bg_color);
+ if (context->fg_color)
+ g_string_append_printf (state->buf, " color='%s'", context->fg_color);
+
+ if (context->bold)
+ g_string_append (state->buf, " weight='bold'");
+ if (context->italic)
+ g_string_append (state->buf, " style='italic'");
+
+ g_string_append (state->buf, ">");
+}
+
+static void
+qttext_prepare_text (ParserState * state)
+{
+ GstQTTextContext *context = GST_QTTEXT_CONTEXT (state);
+ if (state->buf == NULL) {
+ state->buf = g_string_sized_new (256); /* this should be enough */
+ } else {
+ g_string_append (state->buf, "\n");
+ }
+
+ /* if needed, add pango markup */
+ if (context->need_markup) {
+ if (context->markup_open) {
+ g_string_append (state->buf, "</span>");
+ }
+ qttext_open_markup (state);
+ context->markup_open = TRUE;
+ }
+}
+
+static void
+qttext_parse_text (ParserState * state, const gchar * line, gint index)
+{
+ qttext_prepare_text (state);
+ g_string_append (state->buf, line + index);
+}
+
+static gchar *
+qttext_get_text (ParserState * state)
+{
+ gchar *ret;
+ GstQTTextContext *context = GST_QTTEXT_CONTEXT (state);
+ if (state->buf == NULL)
+ return NULL;
+
+ if (context->markup_open) {
+ g_string_append (state->buf, "</span>");
+ }
+ ret = g_string_free (state->buf, FALSE);
+ state->buf = NULL;
+ context->markup_open = FALSE;
+ return ret;
+}
+
+gchar *
+parse_qttext (ParserState * state, const gchar * line)
+{
+ gint i;
+ guint64 ts;
+ gchar *ret = NULL;
+ GstQTTextContext *context = GST_QTTEXT_CONTEXT (state);
+
+ i = 0;
+ while (line[i] != '\0') {
+ /* find first interesting character from 'i' onwards */
+
+ if (line[i] == '{') {
+ /* this is a tag, parse it */
+ if (!qttext_parse_tag (state, line, &i)) {
+ break;
+ }
+ } else if (line[i] == '[') {
+ /* this is a time, convert it to a timestamp */
+ ts = qttext_parse_timestamp (state, line, i);
+
+ /* check if we have pending text to send, in case we prepare it */
+ if (state->buf) {
+ ret = qttext_get_text (state);
+ if (context->absolute)
+ state->duration = ts - context->start_time;
+ else
+ state->duration = ts;
+ state->start_time = context->start_time;
+ }
+ state->buf = NULL;
+
+ if (ts == 0) {
+ /* this is an error */
+ } else {
+ if (context->absolute)
+ context->start_time = ts;
+ else
+ context->start_time += ts;
+ }
+
+ /* we assume there is nothing else on this line */
+ break;
+
+ } else if (line[i] == ' ' || line[i] == '\t') {
+ i++; /* NOP */
+ } else {
+ /* this is the actual text, output the rest of the line as it */
+ qttext_parse_text (state, line, i);
+ break;
+ }
+ }
+ return ret;
+}
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