gstreamer/gst/inter/gstintersubsrc.c

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/* GStreamer
* Copyright (C) 2011 David Schleef <ds@entropywave.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 Street, Suite 500,
* Boston, MA 02110-1335, USA.
*/
/**
* SECTION:element-gstintersubsrc
*
* The intersubsrc element is a subtitle source element. It is used
* in connection with a intersubsink element in a different pipeline,
* similar to interaudiosink and interaudiosrc.
*
* <refsect2>
* <title>Example launch line</title>
* |[
* gst-launch -v intersubsrc ! kateenc ! oggmux ! filesink location=out.ogv
* ]|
*
* The intersubsrc element cannot be used effectively with gst-launch,
* as it requires a second pipeline in the application to send subtitles.
* See the gstintertest.c example in the gst-plugins-bad source code for
* more details.
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* </refsect2>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/gst.h>
#include <gst/base/gstbasesrc.h>
#include "gstintersubsrc.h"
GST_DEBUG_CATEGORY_STATIC (gst_inter_sub_src_debug_category);
#define GST_CAT_DEFAULT gst_inter_sub_src_debug_category
/* prototypes */
static void gst_inter_sub_src_set_property (GObject * object,
guint property_id, const GValue * value, GParamSpec * pspec);
static void gst_inter_sub_src_get_property (GObject * object,
guint property_id, GValue * value, GParamSpec * pspec);
static gboolean gst_inter_sub_src_start (GstBaseSrc * src);
static gboolean gst_inter_sub_src_stop (GstBaseSrc * src);
static void
gst_inter_sub_src_get_times (GstBaseSrc * src, GstBuffer * buffer,
GstClockTime * start, GstClockTime * end);
static GstFlowReturn
gst_inter_sub_src_create (GstBaseSrc * src, guint64 offset, guint size,
GstBuffer ** buf);
enum
{
PROP_0,
PROP_CHANNEL
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};
/* pad templates */
static GstStaticPadTemplate gst_inter_sub_src_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("application/unknown")
);
/* class initialization */
G_DEFINE_TYPE (GstInterSubSrc, gst_inter_sub_src, GST_TYPE_BASE_SRC);
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static void
gst_inter_sub_src_class_init (GstInterSubSrcClass * klass)
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{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
GstBaseSrcClass *base_src_class = GST_BASE_SRC_CLASS (klass);
GST_DEBUG_CATEGORY_INIT (gst_inter_sub_src_debug_category, "intersubsrc", 0,
"debug category for intersubsrc element");
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gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_inter_sub_src_src_template));
gst_element_class_set_metadata (element_class,
"Internal subtitle source",
"Source/Subtitle",
"Virtual subtitle source for internal process communication",
"David Schleef <ds@schleef.org>");
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gobject_class->set_property = gst_inter_sub_src_set_property;
gobject_class->get_property = gst_inter_sub_src_get_property;
base_src_class->start = GST_DEBUG_FUNCPTR (gst_inter_sub_src_start);
base_src_class->stop = GST_DEBUG_FUNCPTR (gst_inter_sub_src_stop);
base_src_class->get_times = GST_DEBUG_FUNCPTR (gst_inter_sub_src_get_times);
base_src_class->create = GST_DEBUG_FUNCPTR (gst_inter_sub_src_create);
g_object_class_install_property (gobject_class, PROP_CHANNEL,
g_param_spec_string ("channel", "Channel",
"Channel name to match inter src and sink elements",
"default", G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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}
static void
gst_inter_sub_src_init (GstInterSubSrc * intersubsrc)
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{
intersubsrc->srcpad =
gst_pad_new_from_static_template (&gst_inter_sub_src_src_template, "src");
gst_base_src_set_format (GST_BASE_SRC (intersubsrc), GST_FORMAT_TIME);
gst_base_src_set_live (GST_BASE_SRC (intersubsrc), TRUE);
intersubsrc->channel = g_strdup ("default");
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}
void
gst_inter_sub_src_set_property (GObject * object, guint property_id,
const GValue * value, GParamSpec * pspec)
{
GstInterSubSrc *intersubsrc = GST_INTER_SUB_SRC (object);
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switch (property_id) {
case PROP_CHANNEL:
g_free (intersubsrc->channel);
intersubsrc->channel = g_value_dup_string (value);
break;
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default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
void
gst_inter_sub_src_get_property (GObject * object, guint property_id,
GValue * value, GParamSpec * pspec)
{
GstInterSubSrc *intersubsrc = GST_INTER_SUB_SRC (object);
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switch (property_id) {
case PROP_CHANNEL:
g_value_set_string (value, intersubsrc->channel);
break;
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default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static gboolean
gst_inter_sub_src_start (GstBaseSrc * src)
{
GstInterSubSrc *intersubsrc = GST_INTER_SUB_SRC (src);
GST_DEBUG_OBJECT (intersubsrc, "start");
intersubsrc->surface = gst_inter_surface_get (intersubsrc->channel);
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return TRUE;
}
static gboolean
gst_inter_sub_src_stop (GstBaseSrc * src)
{
GstInterSubSrc *intersubsrc = GST_INTER_SUB_SRC (src);
GST_DEBUG_OBJECT (intersubsrc, "stop");
gst_inter_surface_unref (intersubsrc->surface);
intersubsrc->surface = NULL;
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return TRUE;
}
static void
gst_inter_sub_src_get_times (GstBaseSrc * src, GstBuffer * buffer,
GstClockTime * start, GstClockTime * end)
{
GstInterSubSrc *intersubsrc = GST_INTER_SUB_SRC (src);
GST_DEBUG_OBJECT (intersubsrc, "get_times");
/* for live sources, sync on the timestamp of the buffer */
if (gst_base_src_is_live (src)) {
GstClockTime timestamp = GST_BUFFER_TIMESTAMP (buffer);
if (GST_CLOCK_TIME_IS_VALID (timestamp)) {
/* get duration to calculate end time */
GstClockTime duration = GST_BUFFER_DURATION (buffer);
if (GST_CLOCK_TIME_IS_VALID (duration)) {
*end = timestamp + duration;
}
*start = timestamp;
}
} else {
*start = -1;
*end = -1;
}
}
static GstFlowReturn
gst_inter_sub_src_create (GstBaseSrc * src, guint64 offset, guint size,
GstBuffer ** buf)
{
GstInterSubSrc *intersubsrc = GST_INTER_SUB_SRC (src);
GstBuffer *buffer;
GST_DEBUG_OBJECT (intersubsrc, "create");
buffer = NULL;
g_mutex_lock (intersubsrc->surface->mutex);
if (intersubsrc->surface->sub_buffer) {
buffer = gst_buffer_ref (intersubsrc->surface->sub_buffer);
//intersubsrc->surface->sub_buffer_count++;
//if (intersubsrc->surface->sub_buffer_count >= 30) {
gst_buffer_unref (intersubsrc->surface->sub_buffer);
intersubsrc->surface->sub_buffer = NULL;
//}
}
g_mutex_unlock (intersubsrc->surface->mutex);
if (buffer == NULL) {
GstMapInfo map;
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buffer = gst_buffer_new_and_alloc (1);
gst_buffer_map (buffer, &map, GST_MAP_WRITE);
map.data[0] = 0;
gst_buffer_unmap (buffer, &map);
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}
buffer = gst_buffer_make_writable (buffer);
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/* FIXME: does this make sense? Rate is always 0 */
#if 0
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GST_BUFFER_TIMESTAMP (buffer) =
gst_util_uint64_scale_int (GST_SECOND, intersubsrc->n_frames,
intersubsrc->rate);
GST_DEBUG_OBJECT (intersubsrc, "create ts %" GST_TIME_FORMAT,
GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buffer)));
GST_BUFFER_DURATION (buffer) =
gst_util_uint64_scale_int (GST_SECOND, (intersubsrc->n_frames + 1),
intersubsrc->rate) - GST_BUFFER_TIMESTAMP (buffer);
#endif
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GST_BUFFER_OFFSET (buffer) = intersubsrc->n_frames;
GST_BUFFER_OFFSET_END (buffer) = -1;
GST_BUFFER_FLAG_UNSET (buffer, GST_BUFFER_FLAG_DISCONT);
if (intersubsrc->n_frames == 0) {
GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DISCONT);
}
intersubsrc->n_frames++;
*buf = buffer;
return GST_FLOW_OK;
}