gstreamer/ext/kate/gstkatedec.c

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/*
* GStreamer
* Copyright 2005 Thomas Vander Stichele <thomas@apestaart.org>
* Copyright 2005 Ronald S. Bultje <rbultje@ronald.bitfreak.net>
* Copyright 2008, 2009 Vincent Penquerc'h <ogg.k.ogg.k@googlemail.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*
* Alternatively, the contents of this file may be used under the
* GNU Lesser General Public License Version 2.1 (the "LGPL"), in
* which case the following provisions apply instead of the ones
* mentioned above:
*
* 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.
*/
/**
* SECTION:element-katedec
* @see_also: oggdemux
*
* <refsect2>
* <para>
* This element decodes Kate streams
* <ulink url="http://libkate.googlecode.com/">Kate</ulink> is a free codec
* for text based data, such as subtitles. Any number of kate streams can be
* embedded in an Ogg stream.
* </para>
* <para>
* libkate (see above url) is needed to build this plugin.
* </para>
* <title>Example pipeline</title>
* <para>
* This explicitely decodes a Kate stream:
* <programlisting>
* gst-launch filesrc location=test.ogg ! oggdemux ! katedec ! fakesink silent=TRUE
* </programlisting>
* </para>
* <para>
* This will automatically detect and use any Kate streams multiplexed
* in an Ogg stream:
* <programlisting>
* gst-launch playbin uri=file:///tmp/test.ogg
* </programlisting>
* </para>
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include <gst/gst.h>
#include "gstkate.h"
#include "gstkatespu.h"
#include "gstkatedec.h"
GST_DEBUG_CATEGORY_EXTERN (gst_katedec_debug);
#define GST_CAT_DEFAULT gst_katedec_debug
/* Filter signals and args */
enum
{
/* FILL ME */
LAST_SIGNAL
};
enum
{
ARG_REMOVE_MARKUP = DECODER_BASE_ARG_COUNT
};
/* We don't accept application/x-kate here on purpose for now, since we're
* only really interested in subtitle-like things for playback purposes, not
* cracktastic complex overlays or presentation images etc. - those should be
* fed into a tiger overlay plugin directly */
static GstStaticPadTemplate sink_factory = GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("subtitle/x-kate")
);
static GstStaticPadTemplate src_factory = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("text/plain; text/x-pango-markup; " GST_KATE_SPU_MIME_TYPE)
);
GST_BOILERPLATE (GstKateDec, gst_kate_dec, GstElement, GST_TYPE_ELEMENT);
static void gst_kate_dec_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_kate_dec_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static GstFlowReturn gst_kate_dec_chain (GstPad * pad, GstBuffer * buf);
static GstStateChangeReturn gst_kate_dec_change_state (GstElement * element,
GstStateChange transition);
static gboolean gst_kate_dec_sink_query (GstPad * pad, GstQuery * query);
static void
gst_kate_dec_base_init (gpointer gclass)
{
static GstElementDetails element_details =
GST_ELEMENT_DETAILS ("Kate stream text decoder",
"Codec/Decoder/Subtitle",
"Decodes Kate text streams",
"Vincent Penquerc'h <ogg.k.ogg.k@googlemail.com>");
GstElementClass *element_class = GST_ELEMENT_CLASS (gclass);
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&src_factory));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&sink_factory));
gst_element_class_set_details (element_class, &element_details);
}
/* initialize the plugin's class */
static void
gst_kate_dec_class_init (GstKateDecClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_kate_dec_set_property);
gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_kate_dec_get_property);
gst_kate_util_install_decoder_base_properties (gobject_class);
g_object_class_install_property (gobject_class, ARG_REMOVE_MARKUP,
g_param_spec_boolean ("remove-markup", "Remove markup",
"Remove markup from decoded text ?", FALSE, G_PARAM_READWRITE));
gstelement_class->change_state =
GST_DEBUG_FUNCPTR (gst_kate_dec_change_state);
}
/* initialize the new element
* instantiate pads and add them to element
* set functions
* initialize structure
*/
static void
gst_kate_dec_init (GstKateDec * dec, GstKateDecClass * gclass)
{
GST_DEBUG_OBJECT (dec, "gst_kate_dec_init");
dec->sinkpad = gst_pad_new_from_static_template (&sink_factory, "sink");
gst_pad_set_chain_function (dec->sinkpad,
GST_DEBUG_FUNCPTR (gst_kate_dec_chain));
gst_pad_set_query_function (dec->sinkpad,
GST_DEBUG_FUNCPTR (gst_kate_dec_sink_query));
gst_pad_use_fixed_caps (dec->sinkpad);
gst_pad_set_caps (dec->sinkpad,
gst_static_pad_template_get_caps (&sink_factory));
gst_element_add_pad (GST_ELEMENT (dec), dec->sinkpad);
dec->srcpad = gst_pad_new_from_static_template (&src_factory, "src");
gst_element_add_pad (GST_ELEMENT (dec), dec->srcpad);
gst_kate_util_decode_base_init (&dec->decoder);
dec->remove_markup = FALSE;
}
static void
gst_kate_dec_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
switch (prop_id) {
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_kate_dec_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstKateDec *kd = GST_KATE_DEC (object);
switch (prop_id) {
case ARG_REMOVE_MARKUP:
g_value_set_boolean (value, kd->remove_markup);
break;
default:
if (!gst_kate_util_decoder_base_get_property (&kd->decoder, object,
prop_id, value, pspec)) {
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
}
break;
}
}
/* GstElement vmethod implementations */
/* chain function
* this function does the actual processing
*/
static GstFlowReturn
gst_kate_dec_chain (GstPad * pad, GstBuffer * buf)
{
GstKateDec *kd = GST_KATE_DEC (gst_pad_get_parent (pad));
const kate_event *ev = NULL;
GstFlowReturn rflow = GST_FLOW_OK;
rflow =
gst_kate_util_decoder_base_chain_kate_packet (&kd->decoder,
GST_ELEMENT_CAST (kd), pad, buf, kd->srcpad, &ev);
if (G_UNLIKELY (rflow != GST_FLOW_OK)) {
gst_object_unref (kd);
gst_buffer_unref (buf);
return rflow;
}
if (ev) {
gchar *escaped;
GstBuffer *buffer;
size_t len;
gboolean plain = TRUE;
if (kd->remove_markup && ev->text_markup_type != kate_markup_none) {
size_t len0 = ev->len + 1;
escaped = g_strdup (ev->text);
if (escaped) {
kate_text_remove_markup (ev->text_encoding, escaped, &len0);
}
plain = TRUE;
} else if (ev->text_markup_type == kate_markup_none) {
/* no pango markup yet, escape text */
/* TODO: actually do the pango thing */
escaped = g_strdup (ev->text);
plain = TRUE;
} else {
escaped = g_strdup (ev->text);
plain = FALSE;
}
if (G_LIKELY (escaped)) {
len = strlen (escaped);
if (len > 0) {
GST_DEBUG_OBJECT (kd, "kate event: %s, escaped %s", ev->text, escaped);
buffer = gst_buffer_new_and_alloc (len + 1);
if (G_LIKELY (buffer)) {
const char *mime = plain ? "text/plain" : "text/x-pango-markup";
GstCaps *caps = gst_caps_new_simple (mime, NULL);
gst_buffer_set_caps (buffer, caps);
gst_caps_unref (caps);
/* allocate and copy the NULs, but don't include them in passed size */
memcpy (GST_BUFFER_DATA (buffer), escaped, len + 1);
GST_BUFFER_SIZE (buffer) = len;
GST_BUFFER_TIMESTAMP (buffer) = ev->start_time * GST_SECOND;
GST_BUFFER_DURATION (buffer) =
(ev->end_time - ev->start_time) * GST_SECOND;
rflow = gst_pad_push (kd->srcpad, buffer);
if (rflow == GST_FLOW_NOT_LINKED) {
GST_DEBUG_OBJECT (kd, "source pad not linked, ignored");
} else if (rflow != GST_FLOW_OK) {
GST_WARNING_OBJECT (kd, "failed to push buffer: %s",
gst_flow_get_name (rflow));
}
} else {
GST_ELEMENT_ERROR (kd, STREAM, DECODE, (NULL),
("Failed to create buffer"));
rflow = GST_FLOW_ERROR;
}
} else {
GST_WARNING_OBJECT (kd, "Empty string, nothing to do");
rflow = GST_FLOW_OK;
}
g_free (escaped);
} else {
GST_ELEMENT_ERROR (kd, STREAM, DECODE, (NULL),
("Failed to allocate string"));
rflow = GST_FLOW_ERROR;
}
// if there's a background paletted bitmap, construct a DVD SPU for it
if (ev->bitmap && ev->palette) {
GstBuffer *buffer = gst_kate_spu_encode_spu (kd, ev);
if (buffer) {
GstCaps *caps = gst_caps_new_simple (GST_KATE_SPU_MIME_TYPE, NULL);
gst_buffer_set_caps (buffer, caps);
gst_caps_unref (caps);
GST_BUFFER_TIMESTAMP (buffer) = ev->start_time * GST_SECOND;
GST_BUFFER_DURATION (buffer) =
(ev->end_time - ev->start_time) * GST_SECOND;
rflow = gst_pad_push (kd->srcpad, buffer);
if (rflow == GST_FLOW_NOT_LINKED) {
GST_DEBUG_OBJECT (kd, "source pad not linked, ignored");
} else if (rflow != GST_FLOW_OK) {
GST_WARNING_OBJECT (kd, "failed to push buffer: %s",
gst_flow_get_name (rflow));
}
} else {
GST_ELEMENT_ERROR (kd, STREAM, DECODE, (NULL),
("failed to create SPU from paletted bitmap"));
rflow = GST_FLOW_ERROR;
}
}
}
gst_object_unref (kd);
gst_buffer_unref (buf);
return rflow;
}
static GstStateChangeReturn
gst_kate_dec_change_state (GstElement * element, GstStateChange transition)
{
GstKateDec *kd = GST_KATE_DEC (element);
return gst_kate_decoder_base_change_state (&kd->decoder, element,
parent_class, transition);
}
gboolean
gst_kate_dec_sink_query (GstPad * pad, GstQuery * query)
{
GstKateDec *kd = GST_KATE_DEC (gst_pad_get_parent (pad));
gboolean res =
gst_kate_decoder_base_sink_query (&kd->decoder, GST_ELEMENT_CAST (kd),
pad, query);
gst_object_unref (kd);
return res;
}