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