Add srt subtitle encoder

Original commit message from CVS:
* configure.ac:
* gst/srtenc/Makefile.am:
* gst/srtenc/gstsrtenc.c:
* gst/srtenc/gstsrtenc.h:
Add srt subtitle encoder

3 files changed, 327 insertions, 0 deletions

diff --git a/gst/subenc/Makefile.am b/gst/subenc/Makefile.am
new file mode 100644
index 000000000..c83b6bb46
--- /dev/null
+++ b/gst/subenc/Makefile.am
@@ -0,0 +1,10 @@
+plugin_LTLIBRARIES = libgstsrtenc.la
+
+libgstsrtenc_la_SOURCES = \
+                          gstsrtenc.c
+libgstsrtenc_la_CFLAGS = $(GST_PLUGINS_BASE_CFLAGS) $(GST_CFLAGS) $(GST_CONTROLLER_CFLAGS)
+libgstsrtenc_la_LIBADD = $(GST_BASE_LIBS) $(GST_CONTROLLER_LIBS)
+libgstsrtenc_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS)
+
+noinst_HEADERS = \
+                 gstsrtenc.h
diff --git a/gst/subenc/gstsrtenc.c b/gst/subenc/gstsrtenc.c
new file mode 100644
index 000000000..715334bea
--- /dev/null
+++ b/gst/subenc/gstsrtenc.c
@@ -0,0 +1,254 @@
+/* GStreamer
+ * Copyright (C) <2008> Thijs Vermeir <thijsvermeir@gmail.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., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+#include "string.h"
+
+#include "gstsrtenc.h"
+#include <gst/controller/gstcontroller.h>
+
+GST_DEBUG_CATEGORY_STATIC (srtenc_debug);
+#define GST_CAT_DEFAULT srtenc_debug
+
+enum
+{
+  ARG_0,
+  ARG_TIMESTAMP,
+  ARG_DURATION
+};
+
+static GstStaticPadTemplate src_template = GST_STATIC_PAD_TEMPLATE ("src",
+    GST_PAD_SRC,
+    GST_PAD_ALWAYS,
+    GST_STATIC_CAPS ("application/x-subtitle"));
+
+static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
+    GST_PAD_SINK,
+    GST_PAD_ALWAYS,
+    GST_STATIC_CAPS ("text/plain; text/x-pango-markup"));
+
+static GstFlowReturn gst_srtenc_chain (GstPad * pad, GstBuffer * buf);
+static gboolean plugin_init (GstPlugin * plugin);
+static gchar *gst_srtenc_timeconvertion (GstSrtenc * srtenc, GstBuffer * buf);
+static gchar *gst_srtenc_timestamp_to_string (GstClockTime timestamp);
+static void gst_srtenc_base_init (gpointer klass);
+static void gst_srtenc_class_init (GstSrtencClass * klass);
+static void gst_srtenc_get_property (GObject * object, guint prop_id,
+    GValue * value, GParamSpec * pspec);
+static void gst_srtenc_init (GstSrtenc * src, GstSrtencClass * klass);
+static void gst_srtenc_reset (GstSrtenc * srtenc);
+static void gst_srtenc_set_property (GObject * object, guint prop_id,
+    const GValue * value, GParamSpec * pspec);
+
+GST_BOILERPLATE (GstSrtenc, gst_srtenc, GstElement, GST_TYPE_ELEMENT);
+
+static gchar *
+gst_srtenc_timestamp_to_string (GstClockTime timestamp)
+{
+  guint h = timestamp / (3600 * GST_SECOND);
+
+  timestamp -= h * 3600 * GST_SECOND;
+  guint m = timestamp / (60 * GST_SECOND);
+
+  timestamp -= m * 60 * GST_SECOND;
+  guint s = timestamp / GST_SECOND;
+
+  timestamp -= s * GST_SECOND;
+  guint ms = timestamp / GST_MSECOND;
+
+  return g_strdup_printf ("%.2d:%.2d:%.2d,%.3d", h, m, s, ms);
+}
+
+static gchar *
+gst_srtenc_timeconvertion (GstSrtenc * srtenc, GstBuffer * buf)
+{
+  gchar *start_time =
+      gst_srtenc_timestamp_to_string (GST_BUFFER_TIMESTAMP (buf) +
+      srtenc->timestamp);
+  gchar *stop_time =
+      gst_srtenc_timestamp_to_string (GST_BUFFER_TIMESTAMP (buf) +
+      srtenc->timestamp + GST_BUFFER_DURATION (buf) + srtenc->duration);
+  gchar *string = g_strdup_printf ("%s --> %s\n", start_time, stop_time);
+
+  g_free (start_time);
+  g_free (stop_time);
+  return string;
+}
+
+static GstFlowReturn
+gst_srtenc_chain (GstPad * pad, GstBuffer * buf)
+{
+  GstSrtenc *srtenc;
+  GstBuffer *new_buffer;
+  gchar *timing;
+  gchar *string;
+
+  srtenc = GST_SRTENC (gst_pad_get_parent_element (pad));
+  gst_object_sync_values (G_OBJECT (srtenc), GST_BUFFER_TIMESTAMP (buf));
+  timing = gst_srtenc_timeconvertion (srtenc, buf);
+  string = g_strdup_printf ("%d\n%s", srtenc->counter++, timing);
+  g_free (timing);
+  new_buffer =
+      gst_buffer_new_and_alloc (strlen (string) + GST_BUFFER_SIZE (buf) + 2);
+  memcpy (GST_BUFFER_DATA (new_buffer), string, strlen (string));
+  memcpy (GST_BUFFER_DATA (new_buffer) + strlen (string), GST_BUFFER_DATA (buf),
+      GST_BUFFER_SIZE (buf));
+  memcpy (GST_BUFFER_DATA (new_buffer) + GST_BUFFER_SIZE (new_buffer) - 2,
+      "\n\n", 2);
+  g_free (string);
+
+  gst_buffer_unref (buf);
+
+  return gst_pad_push (srtenc->srcpad, new_buffer);
+}
+
+static void
+gst_srtenc_base_init (gpointer klass)
+{
+  GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
+
+  gst_element_class_add_pad_template (element_class,
+      gst_static_pad_template_get (&sink_template));
+  gst_element_class_add_pad_template (element_class,
+      gst_static_pad_template_get (&src_template));
+
+  gst_element_class_set_details_simple (element_class,
+      "Srt encoder", "Codec/Encoder/Subtitle",
+      "Srt subtitle encoder", "Thijs Vermeir <thijsvermeir@gmail.com>");
+}
+
+static void
+gst_srtenc_reset (GstSrtenc * srtenc)
+{
+  srtenc->counter = 1;
+}
+
+static GstStateChangeReturn
+gst_srtenc_change_state (GstElement * element, GstStateChange transition)
+{
+  GstStateChangeReturn ret;
+  GstSrtenc *srtenc = GST_SRTENC (element);
+
+  ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
+  if (ret == GST_STATE_CHANGE_FAILURE)
+    return ret;
+
+  switch (transition) {
+    case GST_STATE_CHANGE_PAUSED_TO_READY:
+      gst_srtenc_reset (srtenc);
+      break;
+    default:
+      break;
+  }
+
+  return ret;
+}
+
+static void
+gst_srtenc_get_property (GObject * object,
+    guint prop_id, GValue * value, GParamSpec * pspec)
+{
+  GstSrtenc *srtenc;
+
+  srtenc = GST_SRTENC (object);
+
+  switch (prop_id) {
+    case ARG_TIMESTAMP:
+      g_value_set_int64 (value, srtenc->timestamp);
+      break;
+    case ARG_DURATION:
+      g_value_set_int64 (value, srtenc->duration);
+      break;
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+  }
+}
+
+static void
+gst_srtenc_set_property (GObject * object,
+    guint prop_id, const GValue * value, GParamSpec * pspec)
+{
+
+  GstSrtenc *srtenc;
+
+  srtenc = GST_SRTENC (object);
+
+  switch (prop_id) {
+    case ARG_TIMESTAMP:
+      srtenc->timestamp = g_value_get_int64 (value);
+      break;
+    case ARG_DURATION:
+      srtenc->duration = g_value_get_int64 (value);
+      break;
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+  }
+}
+
+static void
+gst_srtenc_class_init (GstSrtencClass * klass)
+{
+  GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
+  GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
+
+  gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_srtenc_set_property);
+  gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_srtenc_get_property);
+
+  element_class->change_state = GST_DEBUG_FUNCPTR (gst_srtenc_change_state);
+
+  g_object_class_install_property (gobject_class, ARG_TIMESTAMP,
+      g_param_spec_int64 ("timestamp", "Offset for the starttime",
+          "Offset for the starttime for the subtitles", G_MININT64, G_MAXINT64,
+          0, G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE));
+  g_object_class_install_property (gobject_class, ARG_DURATION,
+      g_param_spec_int64 ("duration", "Offset for the duration",
+          "Offset for the duration of the subtitles", G_MININT64, G_MAXINT64,
+          0, G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE));
+
+  GST_DEBUG_CATEGORY_INIT (srtenc_debug, "srtenc", 0, "srt subtitle encoder");
+}
+
+static void
+gst_srtenc_init (GstSrtenc * srtenc, GstSrtencClass * klass)
+{
+  gst_srtenc_reset (srtenc);
+
+  srtenc->srcpad = gst_pad_new_from_static_template (&src_template, "src");
+  gst_element_add_pad (GST_ELEMENT (srtenc), srtenc->srcpad);
+  srtenc->sinkpad = gst_pad_new_from_static_template (&sink_template, "sink");
+  gst_element_add_pad (GST_ELEMENT (srtenc), srtenc->sinkpad);
+  gst_pad_set_chain_function (srtenc->sinkpad, gst_srtenc_chain);
+}
+
+static gboolean
+plugin_init (GstPlugin * plugin)
+{
+  return gst_element_register (plugin, "srtenc", GST_RANK_NONE,
+      GST_TYPE_SRTENC);
+}
+
+GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
+    GST_VERSION_MINOR,
+    "srtenc",
+    "Srt subtitle encoder",
+    plugin_init, VERSION, GST_LICENSE, GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)
diff --git a/gst/subenc/gstsrtenc.h b/gst/subenc/gstsrtenc.h
new file mode 100644
index 000000000..0fd865316
--- /dev/null
+++ b/gst/subenc/gstsrtenc.h
@@ -0,0 +1,63 @@
+/* GStreamer
+ * Copyright (C) <2008> Thijs Vermeir <thijsvermeir@gmail.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., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifndef __GST_SRTENC_H__
+#define __GST_SRTENC_H__
+
+#include <gst/gst.h>
+
+G_BEGIN_DECLS
+#define GST_TYPE_SRTENC \
+  (gst_srtenc_get_type())
+#define GST_SRTENC(obj) \
+  (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_SRTENC,GstSrtenc))
+#define GST_SRTENC_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_SRTENC,GstSrtenc))
+#define GST_IS_SRTENC(obj) \
+  (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_SRTENC))
+#define GST_IS_SRTENC_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_SRTENC))
+
+typedef struct _GstSrtenc GstSrtenc;
+typedef struct _GstSrtencClass GstSrtencClass;
+
+struct _GstSrtencClass
+{
+  GstElementClass parent_class;
+};
+
+struct _GstSrtenc
+{
+  GstElement element;
+
+  GstPad *sinkpad;
+  GstPad *srcpad;
+
+  /* properties */
+  gint64 timestamp;
+  gint64 duration;
+
+  /* counter for subtitle entry */
+  guint counter;
+};
+
+GType gst_srtenc_get_type (void);
+
+G_END_DECLS
+#endif