author | hgs |
Wed, 24 Mar 2010 18:04:17 -0500 | |
changeset 16 | 8e837d1bf446 |
parent 0 | 0e761a78d257 |
child 30 | 7e817e7e631c |
permissions | -rw-r--r-- |
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/* GStreamer SSA subtitle parser |
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* Copyright (c) 2006 Tim-Philipp Müller <tim centricular net> |
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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 |
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
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* Boston, MA 02111-1307, USA. |
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*/ |
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|
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/* Super-primitive SSA parser - we just want the text and ignore |
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* everything else like styles and timing codes etc. for now */ |
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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 <stdlib.h> /* atoi() */ |
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#include <string.h> |
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#include "gstssaparse.h" |
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GST_DEBUG_CATEGORY_STATIC (ssa_parse_debug); |
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#define GST_CAT_DEFAULT ssa_parse_debug |
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static GstStaticPadTemplate sink_templ = GST_STATIC_PAD_TEMPLATE ("sink", |
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GST_PAD_SINK, |
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GST_PAD_ALWAYS, |
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GST_STATIC_CAPS ("application/x-ssa; application/x-ass") |
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); |
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static GstStaticPadTemplate src_templ = GST_STATIC_PAD_TEMPLATE ("src", |
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GST_PAD_SRC, |
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GST_PAD_ALWAYS, |
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GST_STATIC_CAPS ("text/x-pango-markup") |
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); |
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GST_BOILERPLATE (GstSsaParse, gst_ssa_parse, GstElement, GST_TYPE_ELEMENT); |
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static GstStateChangeReturn gst_ssa_parse_change_state (GstElement * |
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element, GstStateChange transition); |
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static gboolean gst_ssa_parse_setcaps (GstPad * sinkpad, GstCaps * caps); |
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static gboolean gst_ssa_parse_src_event (GstPad * pad, GstEvent * event); |
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static gboolean gst_ssa_parse_sink_event (GstPad * pad, GstEvent * event); |
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static GstFlowReturn gst_ssa_parse_chain (GstPad * sinkpad, GstBuffer * buf); |
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static void |
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gst_ssa_parse_base_init (gpointer klass) |
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{ |
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GstElementClass *element_class = GST_ELEMENT_CLASS (klass); |
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static GstElementDetails ssa_parse_details = { |
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"SSA Subtitle Parser", |
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"Codec/Parser/Subtitle", |
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"Parses SSA subtitle streams", |
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"Tim-Philipp Müller <tim centricular net>" |
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}; |
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gst_element_class_add_pad_template (element_class, |
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gst_static_pad_template_get (&sink_templ)); |
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gst_element_class_add_pad_template (element_class, |
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gst_static_pad_template_get (&src_templ)); |
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gst_element_class_set_details (element_class, &ssa_parse_details); |
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GST_DEBUG_CATEGORY_INIT (ssa_parse_debug, "ssaparse", 0, |
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"SSA subtitle parser"); |
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} |
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static void |
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gst_ssa_parse_dispose (GObject * object) |
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{ |
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GstSsaParse *parse = GST_SSA_PARSE (object); |
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g_free (parse->ini); |
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parse->ini = NULL; |
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GST_CALL_PARENT (G_OBJECT_CLASS, dispose, (object)); |
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} |
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static void |
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gst_ssa_parse_init (GstSsaParse * parse, GstSsaParseClass * klass) |
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{ |
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parse->sinkpad = gst_pad_new_from_static_template (&sink_templ, "sink"); |
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gst_pad_set_setcaps_function (parse->sinkpad, |
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GST_DEBUG_FUNCPTR (gst_ssa_parse_setcaps)); |
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gst_pad_set_chain_function (parse->sinkpad, |
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GST_DEBUG_FUNCPTR (gst_ssa_parse_chain)); |
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gst_pad_set_event_function (parse->sinkpad, |
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GST_DEBUG_FUNCPTR (gst_ssa_parse_sink_event)); |
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gst_element_add_pad (GST_ELEMENT (parse), parse->sinkpad); |
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parse->srcpad = gst_pad_new_from_static_template (&src_templ, "src"); |
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|
101 |
gst_pad_set_event_function (parse->srcpad, |
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|
102 |
GST_DEBUG_FUNCPTR (gst_ssa_parse_src_event)); |
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|
103 |
gst_element_add_pad (GST_ELEMENT (parse), parse->srcpad); |
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|
104 |
gst_pad_use_fixed_caps (parse->srcpad); |
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|
105 |
gst_pad_set_caps (parse->srcpad, |
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|
106 |
gst_static_pad_template_get_caps (&src_templ)); |
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|
107 |
|
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|
108 |
parse->ini = NULL; |
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|
109 |
parse->framed = FALSE; |
16 | 110 |
parse->send_tags = FALSE; |
0
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111 |
} |
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|
112 |
|
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113 |
static void |
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114 |
gst_ssa_parse_class_init (GstSsaParseClass * klass) |
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|
115 |
{ |
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|
116 |
GObjectClass *object_class = G_OBJECT_CLASS (klass); |
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|
117 |
GstElementClass *element_class = GST_ELEMENT_CLASS (klass); |
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|
118 |
|
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|
119 |
object_class->dispose = GST_DEBUG_FUNCPTR (gst_ssa_parse_dispose); |
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|
120 |
|
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121 |
element_class->change_state = GST_DEBUG_FUNCPTR (gst_ssa_parse_change_state); |
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|
122 |
} |
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123 |
|
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124 |
static gboolean |
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125 |
gst_ssa_parse_src_event (GstPad * pad, GstEvent * event) |
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126 |
{ |
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127 |
return gst_pad_event_default (pad, event); |
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128 |
} |
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|
129 |
|
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130 |
static gboolean |
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|
131 |
gst_ssa_parse_sink_event (GstPad * pad, GstEvent * event) |
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132 |
{ |
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|
133 |
return gst_pad_event_default (pad, event); |
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|
134 |
} |
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|
135 |
|
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|
136 |
static gboolean |
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|
137 |
gst_ssa_parse_setcaps (GstPad * sinkpad, GstCaps * caps) |
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|
138 |
{ |
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|
139 |
GstSsaParse *parse = GST_SSA_PARSE (GST_PAD_PARENT (sinkpad)); |
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|
140 |
const GValue *val; |
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|
141 |
GstStructure *s; |
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|
142 |
const guchar bom_utf8[] = { 0xEF, 0xBB, 0xBF }; |
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|
143 |
GstBuffer *priv; |
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|
144 |
gchar *data; |
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|
145 |
guint size; |
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|
146 |
|
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|
147 |
s = gst_caps_get_structure (caps, 0); |
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|
148 |
val = gst_structure_get_value (s, "codec_data"); |
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|
149 |
if (val == NULL) { |
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|
150 |
parse->framed = FALSE; |
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|
151 |
GST_ERROR ("Only SSA subtitles embedded in containers are supported"); |
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|
152 |
return FALSE; |
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|
153 |
} |
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|
154 |
|
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|
155 |
parse->framed = TRUE; |
16 | 156 |
parse->send_tags = TRUE; |
0
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|
157 |
|
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|
158 |
priv = (GstBuffer *) gst_value_get_mini_object (val); |
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|
159 |
g_return_val_if_fail (priv != NULL, FALSE); |
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|
160 |
|
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|
161 |
gst_buffer_ref (priv); |
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|
162 |
|
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|
163 |
data = (gchar *) GST_BUFFER_DATA (priv); |
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|
164 |
size = GST_BUFFER_SIZE (priv); |
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|
165 |
/* skip UTF-8 BOM */ |
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|
166 |
if (size >= 3 && memcmp (data, bom_utf8, 3) == 0) { |
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|
167 |
data += 3; |
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|
168 |
size -= 3; |
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|
169 |
} |
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|
170 |
|
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|
171 |
if (!strstr (data, "[Script Info]")) { |
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|
172 |
GST_WARNING_OBJECT (parse, "Invalid Init section - no Script Info header"); |
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|
173 |
gst_buffer_unref (priv); |
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|
174 |
return FALSE; |
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|
175 |
} |
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|
176 |
|
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|
177 |
if (!g_utf8_validate (data, size, NULL)) { |
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|
178 |
GST_WARNING_OBJECT (parse, "Init section is not valid UTF-8"); |
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|
179 |
gst_buffer_unref (priv); |
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|
180 |
return FALSE; |
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|
181 |
} |
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|
182 |
|
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|
183 |
/* FIXME: parse initial section */ |
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|
184 |
parse->ini = g_strndup (data, size); |
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|
185 |
GST_LOG_OBJECT (parse, "Init section:\n%s", parse->ini); |
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|
186 |
|
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|
187 |
gst_buffer_unref (priv); |
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|
188 |
|
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|
189 |
return TRUE; |
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|
190 |
} |
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|
191 |
|
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|
192 |
static gboolean |
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|
193 |
gst_ssa_parse_remove_override_codes (GstSsaParse * parse, gchar * txt) |
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|
194 |
{ |
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|
195 |
gchar *t, *end; |
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|
196 |
gboolean removed_any = FALSE; |
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|
197 |
|
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|
198 |
while ((t = strchr (txt, '{'))) { |
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|
199 |
end = strchr (txt, '}'); |
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|
200 |
if (end == NULL) { |
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|
201 |
GST_WARNING_OBJECT (parse, "Missing { for style override code"); |
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|
202 |
return removed_any; |
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|
203 |
} |
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|
204 |
/* move terminating NUL character forward as well */ |
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|
205 |
g_memmove (t, end + 1, strlen (end + 1) + 1); |
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|
206 |
removed_any = TRUE; |
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|
207 |
} |
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|
208 |
|
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|
209 |
/* these may occur outside of curly brackets. We don't handle the different |
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|
210 |
* wrapping modes yet, so just remove these markers from the text for now */ |
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|
211 |
while ((t = strstr (txt, "\\n"))) { |
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|
212 |
t[0] = ' '; |
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|
213 |
t[1] = '\n'; |
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|
214 |
} |
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|
215 |
while ((t = strstr (txt, "\\N"))) { |
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|
216 |
t[0] = ' '; |
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|
217 |
t[1] = '\n'; |
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|
218 |
} |
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|
219 |
while ((t = strstr (txt, "\\h"))) { |
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|
220 |
t[0] = ' '; |
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|
221 |
t[1] = ' '; |
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|
222 |
} |
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|
223 |
|
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|
224 |
return removed_any; |
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|
225 |
} |
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|
226 |
|
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|
227 |
/** |
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|
228 |
* gst_ssa_parse_push_line: |
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|
229 |
* @parse: caller element |
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|
230 |
* @txt: text to push |
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|
231 |
* @start: timestamp for the buffer |
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|
232 |
* @duration: duration for the buffer |
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|
233 |
* |
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|
234 |
* Parse the text in a buffer with the given properties and |
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|
235 |
* push it to the srcpad of the @parse element |
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|
236 |
* |
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|
237 |
* Returns: result of the push of the created buffer |
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|
238 |
*/ |
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|
239 |
static GstFlowReturn |
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|
240 |
gst_ssa_parse_push_line (GstSsaParse * parse, gchar * txt, |
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|
241 |
GstClockTime start, GstClockTime duration) |
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|
242 |
{ |
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|
243 |
GstFlowReturn ret; |
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|
244 |
GstBuffer *buf; |
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|
245 |
gchar *t, *escaped; |
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|
246 |
gint num, i, len; |
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|
247 |
|
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|
248 |
num = atoi (txt); |
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|
249 |
GST_LOG_OBJECT (parse, "Parsing line #%d at %" GST_TIME_FORMAT, |
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|
250 |
num, GST_TIME_ARGS (start)); |
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|
251 |
|
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|
252 |
/* skip all non-text fields before the actual text */ |
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|
253 |
t = txt; |
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|
254 |
for (i = 0; i < 8; ++i) { |
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Revision: 200949
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|
255 |
t = strchr (t, ','); |
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Revision: 200949
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|
256 |
if (t == NULL) |
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|
257 |
return GST_FLOW_ERROR; |
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|
258 |
++t; |
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|
259 |
} |
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|
260 |
|
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|
261 |
GST_LOG_OBJECT (parse, "Text : %s", t); |
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|
262 |
|
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|
263 |
if (gst_ssa_parse_remove_override_codes (parse, t)) { |
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Revision: 200949
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diff
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|
264 |
GST_LOG_OBJECT (parse, "Clean: %s", t); |
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|
265 |
} |
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diff
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|
266 |
|
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Revision: 200949
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diff
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|
267 |
/* we claim to output pango markup, so we must escape the |
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Revision: 200949
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parents:
diff
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|
268 |
* text even if we don't actually use any pango markup yet */ |
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Revision: 200949
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diff
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|
269 |
escaped = g_markup_printf_escaped ("%s", t); |
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diff
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|
270 |
|
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Revision: 200949
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|
271 |
len = strlen (escaped); |
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Revision: 200949
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|
272 |
|
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Revision: 200949
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diff
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|
273 |
/* allocate enough for a terminating NUL, but don't include it in buf size */ |
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Revision: 200949
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|
274 |
buf = gst_buffer_new_and_alloc (len + 1); |
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Revision: 200949
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|
275 |
memcpy (GST_BUFFER_DATA (buf), escaped, len + 1); |
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|
276 |
GST_BUFFER_SIZE (buf) = len; |
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|
277 |
g_free (escaped); |
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|
278 |
|
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|
279 |
GST_BUFFER_TIMESTAMP (buf) = start; |
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|
280 |
GST_BUFFER_DURATION (buf) = duration; |
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|
281 |
|
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|
282 |
gst_buffer_set_caps (buf, GST_PAD_CAPS (parse->srcpad)); |
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diff
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|
283 |
|
0e761a78d257
Revision: 200949
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diff
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|
284 |
GST_LOG_OBJECT (parse, "Pushing buffer with timestamp %" GST_TIME_FORMAT |
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Revision: 200949
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parents:
diff
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|
285 |
" and duration %" GST_TIME_FORMAT, GST_TIME_ARGS (start), |
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Revision: 200949
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parents:
diff
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|
286 |
GST_TIME_ARGS (duration)); |
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Revision: 200949
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parents:
diff
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|
287 |
|
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Revision: 200949
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|
288 |
ret = gst_pad_push (parse->srcpad, buf); |
0e761a78d257
Revision: 200949
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diff
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|
289 |
|
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Revision: 200949
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diff
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|
290 |
if (ret != GST_FLOW_OK) { |
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Revision: 200949
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parents:
diff
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|
291 |
GST_DEBUG_OBJECT (parse, "Push of text '%s' returned flow %s", txt, |
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Revision: 200949
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|
292 |
gst_flow_get_name (ret)); |
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Revision: 200949
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diff
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|
293 |
} |
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diff
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|
294 |
|
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|
295 |
return ret; |
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diff
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|
296 |
} |
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parents:
diff
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|
297 |
|
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Revision: 200949
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|
298 |
static GstFlowReturn |
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Revision: 200949
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parents:
diff
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|
299 |
gst_ssa_parse_chain (GstPad * sinkpad, GstBuffer * buf) |
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|
300 |
{ |
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Revision: 200949
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|
301 |
GstFlowReturn ret; |
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Revision: 200949
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|
302 |
GstSsaParse *parse = GST_SSA_PARSE (GST_PAD_PARENT (sinkpad)); |
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|
303 |
GstClockTime ts; |
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Revision: 200949
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|
304 |
gchar *txt; |
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diff
changeset
|
305 |
|
0e761a78d257
Revision: 200949
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diff
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|
306 |
if (G_UNLIKELY (!parse->framed)) |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
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diff
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|
307 |
goto not_framed; |
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Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
308 |
|
16 | 309 |
if (G_UNLIKELY (parse->send_tags)) { |
310 |
GstTagList *tags; |
|
311 |
||
312 |
tags = gst_tag_list_new (); |
|
313 |
gst_tag_list_add (tags, GST_TAG_MERGE_APPEND, GST_TAG_SUBTITLE_CODEC, |
|
314 |
"SubStation Alpha", NULL); |
|
315 |
gst_element_found_tags_for_pad (GST_ELEMENT (parse), parse->srcpad, tags); |
|
316 |
parse->send_tags = FALSE; |
|
317 |
} |
|
318 |
||
0
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|
319 |
/* make double-sure it's 0-terminated and all */ |
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|
320 |
txt = g_strndup ((gchar *) GST_BUFFER_DATA (buf), GST_BUFFER_SIZE (buf)); |
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|
321 |
if (txt == NULL) |
16 | 322 |
goto empty_text; |
0
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parents:
diff
changeset
|
323 |
|
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|
324 |
ts = GST_BUFFER_TIMESTAMP (buf); |
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|
325 |
ret = gst_ssa_parse_push_line (parse, txt, ts, GST_BUFFER_DURATION (buf)); |
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|
326 |
|
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|
327 |
if (ret != GST_FLOW_OK && GST_CLOCK_TIME_IS_VALID (ts)) { |
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|
328 |
/* just advance time without sending anything */ |
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|
329 |
gst_pad_push_event (parse->srcpad, |
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|
330 |
gst_event_new_new_segment (TRUE, 1.0, GST_FORMAT_TIME, ts, -1, ts)); |
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|
331 |
ret = GST_FLOW_OK; |
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|
332 |
} |
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|
333 |
|
16 | 334 |
gst_buffer_unref (buf); |
0
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|
335 |
g_free (txt); |
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|
336 |
|
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|
337 |
return ret; |
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diff
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|
338 |
|
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Revision: 200949
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|
339 |
/* ERRORS */ |
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|
340 |
not_framed: |
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Revision: 200949
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|
341 |
{ |
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Revision: 200949
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diff
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|
342 |
GST_ELEMENT_ERROR (parse, STREAM, FORMAT, (NULL), |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
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|
343 |
("Only SSA subtitles embedded in containers are supported")); |
16 | 344 |
gst_buffer_unref (buf); |
0
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Revision: 200949
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|
345 |
return GST_FLOW_NOT_NEGOTIATED; |
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diff
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|
346 |
} |
16 | 347 |
empty_text: |
348 |
{ |
|
349 |
GST_ELEMENT_WARNING (parse, STREAM, FORMAT, (NULL), |
|
350 |
("Received empty subtitle")); |
|
351 |
gst_buffer_unref (buf); |
|
352 |
return GST_FLOW_OK; |
|
353 |
} |
|
0
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|
354 |
} |
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Revision: 200949
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parents:
diff
changeset
|
355 |
|
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Revision: 200949
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diff
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|
356 |
static GstStateChangeReturn |
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Revision: 200949
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diff
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|
357 |
gst_ssa_parse_change_state (GstElement * element, GstStateChange transition) |
0e761a78d257
Revision: 200949
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parents:
diff
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|
358 |
{ |
0e761a78d257
Revision: 200949
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parents:
diff
changeset
|
359 |
GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS; |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
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|
360 |
GstSsaParse *parse = GST_SSA_PARSE (element); |
0e761a78d257
Revision: 200949
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parents:
diff
changeset
|
361 |
|
0e761a78d257
Revision: 200949
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parents:
diff
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|
362 |
switch (transition) { |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
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|
363 |
case GST_STATE_CHANGE_READY_TO_PAUSED: |
0e761a78d257
Revision: 200949
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parents:
diff
changeset
|
364 |
break; |
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Revision: 200949
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parents:
diff
changeset
|
365 |
default: |
0e761a78d257
Revision: 200949
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parents:
diff
changeset
|
366 |
break; |
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Revision: 200949
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parents:
diff
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|
367 |
} |
0e761a78d257
Revision: 200949
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parents:
diff
changeset
|
368 |
|
0e761a78d257
Revision: 200949
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parents:
diff
changeset
|
369 |
ret = parent_class->change_state (element, transition); |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
370 |
if (ret == GST_STATE_CHANGE_FAILURE) |
0e761a78d257
Revision: 200949
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parents:
diff
changeset
|
371 |
return ret; |
0e761a78d257
Revision: 200949
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parents:
diff
changeset
|
372 |
|
0e761a78d257
Revision: 200949
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parents:
diff
changeset
|
373 |
switch (transition) { |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
374 |
case GST_STATE_CHANGE_PAUSED_TO_READY: |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
375 |
g_free (parse->ini); |
0e761a78d257
Revision: 200949
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parents:
diff
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|
376 |
parse->ini = NULL; |
0e761a78d257
Revision: 200949
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parents:
diff
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|
377 |
parse->framed = FALSE; |
0e761a78d257
Revision: 200949
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parents:
diff
changeset
|
378 |
break; |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
379 |
default: |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
380 |
break; |
0e761a78d257
Revision: 200949
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parents:
diff
changeset
|
381 |
} |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
382 |
|
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
383 |
return ret; |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
384 |
} |