gst/subenc/gstwebvttenc.c - imx-gst-plugins-bad - Git at Google

 /* GStreamer
  * Copyright (C) <2008> Thijs Vermeir <thijsvermeir@gmail.com>
  * Copyright (C) 2011 David Schleef <ds@schleef.org>
  *
  * 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 St, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  */

 #ifdef HAVE_CONFIG_H
 #include "config.h"
 #endif

 #include <string.h>

 #include "gstwebvttenc.h"

 GST_DEBUG_CATEGORY_STATIC (webvttenc_debug);
 #define GST_CAT_DEFAULT webvttenc_debug

 enum
 {
   PROP_0,
   PROP_TIMESTAMP,
   PROP_DURATION
 };

 static GstStaticPadTemplate src_template = GST_STATIC_PAD_TEMPLATE ("src",
     GST_PAD_SRC,
     GST_PAD_ALWAYS,
     GST_STATIC_CAPS ("application/x-subtitle-vtt"));

 static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
     GST_PAD_SINK,
     GST_PAD_ALWAYS,
     GST_STATIC_CAPS ("text/x-raw, format = { pango-markup, utf8 }"));

 static GstFlowReturn gst_webvtt_enc_chain (GstPad * pad, GstObject * parent,
     GstBuffer * buf);
 static void gst_webvtt_enc_append_timestamp_to_string (GstClockTime timestamp,
     GString * str);
 static void gst_webvtt_enc_get_property (GObject * object, guint prop_id,
     GValue * value, GParamSpec * pspec);
 static void gst_webvtt_enc_reset (GstWebvttEnc * webvttenc);
 static void gst_webvtt_enc_set_property (GObject * object, guint prop_id,
     const GValue * value, GParamSpec * pspec);

 #define parent_class gst_webvtt_enc_parent_class
 G_DEFINE_TYPE (GstWebvttEnc, gst_webvtt_enc, GST_TYPE_ELEMENT);

 static void
 gst_webvtt_enc_append_timestamp_to_string (GstClockTime timestamp,
     GString * str)
 {
   guint h, m, s, ms;

   h = timestamp / (3600 * GST_SECOND);

   timestamp -= h * 3600 * GST_SECOND;
   m = timestamp / (60 * GST_SECOND);

   timestamp -= m * 60 * GST_SECOND;
   s = timestamp / GST_SECOND;

   timestamp -= s * GST_SECOND;
   ms = timestamp / GST_MSECOND;

   g_string_append_printf (str, "%02d:%02d:%02d.%03d", h, m, s, ms);
 }

 static GstFlowReturn
 gst_webvtt_enc_chain (GstPad * pad, GstObject * parent, GstBuffer * buf)
 {
   GstWebvttEnc *webvttenc = GST_WEBVTT_ENC (parent);
   GstClockTime ts, dur = GST_SECOND;
   GstBuffer *new_buffer;
   GstMapInfo map_info;
   GstFlowReturn ret;
   GString *s;
   gsize buf_size;

   if (!webvttenc->pushed_header) {
     const char *header = "WEBVTT\n\n";

     new_buffer = gst_buffer_new_wrapped (g_strdup (header), strlen (header));

     GST_BUFFER_PTS (new_buffer) = GST_CLOCK_TIME_NONE;
     GST_BUFFER_DURATION (new_buffer) = GST_CLOCK_TIME_NONE;

     ret = gst_pad_push (webvttenc->srcpad, new_buffer);

     if (ret != GST_FLOW_OK)
       goto out;

     webvttenc->pushed_header = TRUE;
   }

   gst_object_sync_values (GST_OBJECT (webvttenc), GST_BUFFER_PTS (buf));

   ts = GST_BUFFER_PTS (buf) + webvttenc->timestamp;
   if (GST_BUFFER_DURATION_IS_VALID (buf))
     dur = GST_BUFFER_DURATION (buf) + webvttenc->duration;
   else if (webvttenc->duration > 0)
     dur = webvttenc->duration;
   else
     dur = GST_SECOND;

   buf_size = gst_buffer_get_size (buf);
   s = g_string_sized_new (50 + buf_size + 1 + 1);

   /* start_time --> end_time */
   gst_webvtt_enc_append_timestamp_to_string (ts, s);
   g_string_append_printf (s, " --> ");
   gst_webvtt_enc_append_timestamp_to_string (ts + dur, s);
   g_string_append_c (s, '\n');

   /* text */
   if (gst_buffer_map (buf, &map_info, GST_MAP_READ)) {
     g_string_append_len (s, (const gchar *) map_info.data, map_info.size);
     gst_buffer_unmap (buf, &map_info);
   }

   g_string_append (s, "\n\n");

   buf_size = s->len;
   new_buffer = gst_buffer_new_wrapped (g_string_free (s, FALSE), buf_size);

   GST_BUFFER_TIMESTAMP (new_buffer) = GST_BUFFER_TIMESTAMP (buf);
   GST_BUFFER_DURATION (new_buffer) = GST_BUFFER_DURATION (buf);

   ret = gst_pad_push (webvttenc->srcpad, new_buffer);

 out:

   gst_buffer_unref (buf);

   return ret;
 }

 static gboolean
 gst_webvtt_enc_event (GstPad * pad, GstObject * parent, GstEvent * event)
 {
   GstWebvttEnc *webvttenc = GST_WEBVTT_ENC (parent);
   gboolean ret;

   switch (GST_EVENT_TYPE (event)) {
     case GST_EVENT_CAPS:
     {
       GstCaps *caps;

       caps = gst_static_pad_template_get_caps (&src_template);
       gst_pad_set_caps (webvttenc->srcpad, caps);
       gst_caps_unref (caps);
       gst_event_unref (event);
       ret = TRUE;
       break;
     }
     default:
       ret = gst_pad_event_default (pad, parent, event);
       break;
   }

   return ret;
 }

 static void
 gst_webvtt_enc_reset (GstWebvttEnc * webvttenc)
 {
   webvttenc->counter = 1;
 }

 static GstStateChangeReturn
 gst_webvtt_enc_change_state (GstElement * element, GstStateChange transition)
 {
   GstStateChangeReturn ret;
   GstWebvttEnc *webvttenc = GST_WEBVTT_ENC (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_webvtt_enc_reset (webvttenc);
       break;
     default:
       break;
   }

   return ret;
 }

 static void
 gst_webvtt_enc_get_property (GObject * object,
     guint prop_id, GValue * value, GParamSpec * pspec)
 {
   GstWebvttEnc *webvttenc;

   webvttenc = GST_WEBVTT_ENC (object);

   switch (prop_id) {
     case PROP_TIMESTAMP:
       g_value_set_int64 (value, webvttenc->timestamp);
       break;
     case PROP_DURATION:
       g_value_set_int64 (value, webvttenc->duration);
       break;
     default:
       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
       break;
   }
 }

 static void
 gst_webvtt_enc_set_property (GObject * object,
     guint prop_id, const GValue * value, GParamSpec * pspec)
 {

   GstWebvttEnc *webvttenc;

   webvttenc = GST_WEBVTT_ENC (object);

   switch (prop_id) {
     case PROP_TIMESTAMP:
       webvttenc->timestamp = g_value_get_int64 (value);
       break;
     case PROP_DURATION:
       webvttenc->duration = g_value_get_int64 (value);
       break;
     default:
       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
       break;
   }
 }

 static void
 gst_webvtt_enc_class_init (GstWebvttEncClass * klass)
 {
   GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
   GstElementClass *element_class = GST_ELEMENT_CLASS (klass);

   gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_webvtt_enc_set_property);
   gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_webvtt_enc_get_property);

   element_class->change_state = GST_DEBUG_FUNCPTR (gst_webvtt_enc_change_state);

   g_object_class_install_property (gobject_class, PROP_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_PARAM_STATIC_STRINGS));
   g_object_class_install_property (gobject_class, PROP_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 | G_PARAM_STATIC_STRINGS));

   gst_element_class_add_static_pad_template (element_class, &sink_template);
   gst_element_class_add_static_pad_template (element_class, &src_template);

   gst_element_class_set_static_metadata (element_class,
       "WebVTT encoder", "Codec/Encoder/Subtitle",
       "WebVTT subtitle encoder", "David Schleef <ds@schleef.org>");

   GST_DEBUG_CATEGORY_INIT (webvttenc_debug, "webvttenc", 0,
       "SubRip subtitle encoder");
 }

 static void
 gst_webvtt_enc_init (GstWebvttEnc * webvttenc)
 {
   gst_webvtt_enc_reset (webvttenc);

   webvttenc->srcpad = gst_pad_new_from_static_template (&src_template, "src");
   gst_element_add_pad (GST_ELEMENT (webvttenc), webvttenc->srcpad);
   webvttenc->sinkpad =
       gst_pad_new_from_static_template (&sink_template, "sink");
   gst_pad_set_chain_function (webvttenc->sinkpad,
       GST_DEBUG_FUNCPTR (gst_webvtt_enc_chain));
   gst_pad_set_event_function (webvttenc->sinkpad,
       GST_DEBUG_FUNCPTR (gst_webvtt_enc_event));
   gst_element_add_pad (GST_ELEMENT (webvttenc), webvttenc->sinkpad);
 }
	/* GStreamer
	* Copyright (C) <2008> Thijs Vermeir <thijsvermeir@gmail.com>
	* Copyright (C) 2011 David Schleef <ds@schleef.org>
	*
	* 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 St, Fifth Floor,
	* Boston, MA 02110-1301, USA.
	*/

	#ifdef HAVE_CONFIG_H
	#include "config.h"
	#endif

	#include <string.h>

	#include "gstwebvttenc.h"

	GST_DEBUG_CATEGORY_STATIC (webvttenc_debug);
	#define GST_CAT_DEFAULT webvttenc_debug

	enum
	{
	PROP_0,
	PROP_TIMESTAMP,
	PROP_DURATION
	};

	static GstStaticPadTemplate src_template = GST_STATIC_PAD_TEMPLATE ("src",
	GST_PAD_SRC,
	GST_PAD_ALWAYS,
	GST_STATIC_CAPS ("application/x-subtitle-vtt"));

	static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
	GST_PAD_SINK,
	GST_PAD_ALWAYS,
	GST_STATIC_CAPS ("text/x-raw, format = { pango-markup, utf8 }"));

	static GstFlowReturn gst_webvtt_enc_chain (GstPad * pad, GstObject * parent,
	GstBuffer * buf);
	static void gst_webvtt_enc_append_timestamp_to_string (GstClockTime timestamp,
	GString * str);
	static void gst_webvtt_enc_get_property (GObject * object, guint prop_id,
	GValue * value, GParamSpec * pspec);
	static void gst_webvtt_enc_reset (GstWebvttEnc * webvttenc);
	static void gst_webvtt_enc_set_property (GObject * object, guint prop_id,
	const GValue * value, GParamSpec * pspec);

	#define parent_class gst_webvtt_enc_parent_class
	G_DEFINE_TYPE (GstWebvttEnc, gst_webvtt_enc, GST_TYPE_ELEMENT);

	static void
	gst_webvtt_enc_append_timestamp_to_string (GstClockTime timestamp,
	GString * str)
	{
	guint h, m, s, ms;

	h = timestamp / (3600 * GST_SECOND);

	timestamp -= h * 3600 * GST_SECOND;
	m = timestamp / (60 * GST_SECOND);

	timestamp -= m * 60 * GST_SECOND;
	s = timestamp / GST_SECOND;

	timestamp -= s * GST_SECOND;
	ms = timestamp / GST_MSECOND;

	g_string_append_printf (str, "%02d:%02d:%02d.%03d", h, m, s, ms);
	}

	static GstFlowReturn
	gst_webvtt_enc_chain (GstPad * pad, GstObject * parent, GstBuffer * buf)
	{
	GstWebvttEnc *webvttenc = GST_WEBVTT_ENC (parent);
	GstClockTime ts, dur = GST_SECOND;
	GstBuffer *new_buffer;
	GstMapInfo map_info;
	GstFlowReturn ret;
	GString *s;
	gsize buf_size;

	if (!webvttenc->pushed_header) {
	const char *header = "WEBVTT\n\n";

	new_buffer = gst_buffer_new_wrapped (g_strdup (header), strlen (header));

	GST_BUFFER_PTS (new_buffer) = GST_CLOCK_TIME_NONE;
	GST_BUFFER_DURATION (new_buffer) = GST_CLOCK_TIME_NONE;

	ret = gst_pad_push (webvttenc->srcpad, new_buffer);

	if (ret != GST_FLOW_OK)
	goto out;

	webvttenc->pushed_header = TRUE;
	}

	gst_object_sync_values (GST_OBJECT (webvttenc), GST_BUFFER_PTS (buf));

	ts = GST_BUFFER_PTS (buf) + webvttenc->timestamp;
	if (GST_BUFFER_DURATION_IS_VALID (buf))
	dur = GST_BUFFER_DURATION (buf) + webvttenc->duration;
	else if (webvttenc->duration > 0)
	dur = webvttenc->duration;
	else
	dur = GST_SECOND;

	buf_size = gst_buffer_get_size (buf);
	s = g_string_sized_new (50 + buf_size + 1 + 1);

	/* start_time --> end_time */
	gst_webvtt_enc_append_timestamp_to_string (ts, s);
	g_string_append_printf (s, " --> ");
	gst_webvtt_enc_append_timestamp_to_string (ts + dur, s);
	g_string_append_c (s, '\n');

	/* text */
	if (gst_buffer_map (buf, &map_info, GST_MAP_READ)) {
	g_string_append_len (s, (const gchar *) map_info.data, map_info.size);
	gst_buffer_unmap (buf, &map_info);
	}

	g_string_append (s, "\n\n");

	buf_size = s->len;
	new_buffer = gst_buffer_new_wrapped (g_string_free (s, FALSE), buf_size);

	GST_BUFFER_TIMESTAMP (new_buffer) = GST_BUFFER_TIMESTAMP (buf);
	GST_BUFFER_DURATION (new_buffer) = GST_BUFFER_DURATION (buf);

	ret = gst_pad_push (webvttenc->srcpad, new_buffer);

	out:

	gst_buffer_unref (buf);

	return ret;
	}

	static gboolean
	gst_webvtt_enc_event (GstPad * pad, GstObject * parent, GstEvent * event)
	{
	GstWebvttEnc *webvttenc = GST_WEBVTT_ENC (parent);
	gboolean ret;

	switch (GST_EVENT_TYPE (event)) {
	case GST_EVENT_CAPS:
	{
	GstCaps *caps;

	caps = gst_static_pad_template_get_caps (&src_template);
	gst_pad_set_caps (webvttenc->srcpad, caps);
	gst_caps_unref (caps);
	gst_event_unref (event);
	ret = TRUE;
	break;
	}
	default:
	ret = gst_pad_event_default (pad, parent, event);
	break;
	}

	return ret;
	}

	static void
	gst_webvtt_enc_reset (GstWebvttEnc * webvttenc)
	{
	webvttenc->counter = 1;
	}

	static GstStateChangeReturn
	gst_webvtt_enc_change_state (GstElement * element, GstStateChange transition)
	{
	GstStateChangeReturn ret;
	GstWebvttEnc *webvttenc = GST_WEBVTT_ENC (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_webvtt_enc_reset (webvttenc);
	break;
	default:
	break;
	}

	return ret;
	}

	static void
	gst_webvtt_enc_get_property (GObject * object,
	guint prop_id, GValue * value, GParamSpec * pspec)
	{
	GstWebvttEnc *webvttenc;

	webvttenc = GST_WEBVTT_ENC (object);

	switch (prop_id) {
	case PROP_TIMESTAMP:
	g_value_set_int64 (value, webvttenc->timestamp);
	break;
	case PROP_DURATION:
	g_value_set_int64 (value, webvttenc->duration);
	break;
	default:
	G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
	break;
	}
	}

	static void
	gst_webvtt_enc_set_property (GObject * object,
	guint prop_id, const GValue * value, GParamSpec * pspec)
	{

	GstWebvttEnc *webvttenc;

	webvttenc = GST_WEBVTT_ENC (object);

	switch (prop_id) {
	case PROP_TIMESTAMP:
	webvttenc->timestamp = g_value_get_int64 (value);
	break;
	case PROP_DURATION:
	webvttenc->duration = g_value_get_int64 (value);
	break;
	default:
	G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
	break;
	}
	}

	static void
	gst_webvtt_enc_class_init (GstWebvttEncClass * klass)
	{
	GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
	GstElementClass *element_class = GST_ELEMENT_CLASS (klass);

	gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_webvtt_enc_set_property);
	gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_webvtt_enc_get_property);

	element_class->change_state = GST_DEBUG_FUNCPTR (gst_webvtt_enc_change_state);

	g_object_class_install_property (gobject_class, PROP_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_PARAM_STATIC_STRINGS));
	g_object_class_install_property (gobject_class, PROP_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 \| G_PARAM_STATIC_STRINGS));

	gst_element_class_add_static_pad_template (element_class, &sink_template);
	gst_element_class_add_static_pad_template (element_class, &src_template);

	gst_element_class_set_static_metadata (element_class,
	"WebVTT encoder", "Codec/Encoder/Subtitle",
	"WebVTT subtitle encoder", "David Schleef <ds@schleef.org>");

	GST_DEBUG_CATEGORY_INIT (webvttenc_debug, "webvttenc", 0,
	"SubRip subtitle encoder");
	}

	static void
	gst_webvtt_enc_init (GstWebvttEnc * webvttenc)
	{
	gst_webvtt_enc_reset (webvttenc);

	webvttenc->srcpad = gst_pad_new_from_static_template (&src_template, "src");
	gst_element_add_pad (GST_ELEMENT (webvttenc), webvttenc->srcpad);
	webvttenc->sinkpad =
	gst_pad_new_from_static_template (&sink_template, "sink");
	gst_pad_set_chain_function (webvttenc->sinkpad,
	GST_DEBUG_FUNCPTR (gst_webvtt_enc_chain));
	gst_pad_set_event_function (webvttenc->sinkpad,
	GST_DEBUG_FUNCPTR (gst_webvtt_enc_event));
	gst_element_add_pad (GST_ELEMENT (webvttenc), webvttenc->sinkpad);
	}