ext/resindvd/rsnparsetter.c - mtk-gst-plugins-bad-debian - Git at Google

 /*
  * Copyright (C) 2008 Jan Schmidt <thaytan@noraisin.net>
  */

 #ifdef HAVE_CONFIG_H
 #  include <config.h>
 #endif

 #include <gst/gst.h>
 #include <gst/glib-compat-private.h>
 #include <gst/video/video.h>
 #include <string.h>

 #include "rsnparsetter.h"
 #include "rsnwrappedbuffer.h"

 GST_DEBUG_CATEGORY_STATIC (rsn_parsetter_debug);
 #define GST_CAT_DEFAULT rsn_parsetter_debug

 static GstStaticPadTemplate sink_factory = GST_STATIC_PAD_TEMPLATE ("sink",
     GST_PAD_SINK,
     GST_PAD_ALWAYS,
     GST_STATIC_CAPS ("video/x-raw-rgb; video/x-raw-yuv")
     );

 static GstStaticPadTemplate src_factory = GST_STATIC_PAD_TEMPLATE ("src",
     GST_PAD_SRC,
     GST_PAD_ALWAYS,
     GST_STATIC_CAPS ("video/x-raw-rgb; video/x-raw-yuv")
     );

 static void rsn_parsetter_register_extra (GType rsn_parsetter_type);

 GST_BOILERPLATE_FULL (RsnParSetter, rsn_parsetter, GstElement,
     GST_TYPE_ELEMENT, rsn_parsetter_register_extra);

 static void rsn_parsetter_finalize (GObject * object);
 static GstFlowReturn rsn_parsetter_chain (GstPad * pad, GstBuffer * buf);
 static gboolean rsn_parsetter_sink_event (GstPad * pad, GstEvent * event);
 static gboolean rsn_parsetter_sink_setcaps (GstPad * pad, GstCaps * caps);
 static GstFlowReturn rsn_parsetter_sink_bufferalloc (GstPad * pad,
     guint64 offset, guint size, GstCaps * caps, GstBuffer ** buf);

 static GstCaps *rsn_parsetter_src_getcaps (GstPad * pad);
 static GstCaps *rsn_parsetter_convert_caps (RsnParSetter * parset,
     GstCaps * caps, gboolean widescreen);
 static gboolean rsn_parsetter_check_caps (RsnParSetter * parset,
     GstCaps * caps);

 static void
 rsn_parsetter_register_extra (GType rsn_parsetter_type)
 {
   GST_DEBUG_CATEGORY_INIT (rsn_parsetter_debug, "rsnparsetter", 0,
       "Resin DVD aspect ratio adjuster");
 }

 static void
 rsn_parsetter_base_init (gpointer gclass)
 {

   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_simple (element_class,
       "Resin Aspect Ratio Setter", "Filter/Video",
       "Overrides caps on video buffers to force a particular display ratio",
       "Jan Schmidt <thaytan@noraisin.net>");
 }

 static void
 rsn_parsetter_class_init (RsnParSetterClass * klass)
 {
   GObjectClass *gobject_class;

   gobject_class = (GObjectClass *) klass;

   gobject_class->finalize = rsn_parsetter_finalize;
 }

 static void
 rsn_parsetter_init (RsnParSetter * parset, RsnParSetterClass * gclass)
 {
   parset->sinkpad = gst_pad_new_from_static_template (&sink_factory, "sink");
   gst_pad_set_getcaps_function (parset->sinkpad,
       GST_DEBUG_FUNCPTR (gst_pad_proxy_getcaps));
   gst_pad_set_chain_function (parset->sinkpad,
       GST_DEBUG_FUNCPTR (rsn_parsetter_chain));
   gst_pad_set_event_function (parset->sinkpad,
       GST_DEBUG_FUNCPTR (rsn_parsetter_sink_event));
   gst_pad_set_setcaps_function (parset->sinkpad,
       GST_DEBUG_FUNCPTR (rsn_parsetter_sink_setcaps));
   gst_pad_set_bufferalloc_function (parset->sinkpad,
       GST_DEBUG_FUNCPTR (rsn_parsetter_sink_bufferalloc));
   gst_element_add_pad (GST_ELEMENT (parset), parset->sinkpad);

   parset->srcpad = gst_pad_new_from_static_template (&src_factory, "src");
   gst_pad_set_getcaps_function (parset->srcpad,
       GST_DEBUG_FUNCPTR (rsn_parsetter_src_getcaps));
   gst_element_add_pad (GST_ELEMENT (parset), parset->srcpad);

   parset->caps_lock = g_mutex_new ();
 }

 static void
 rsn_parsetter_finalize (GObject * object)
 {
   RsnParSetter *parset = RSN_PARSETTER (object);

   gst_caps_replace (&parset->outcaps, NULL);
   gst_caps_replace (&parset->in_caps_last, NULL);
   gst_caps_replace (&parset->in_caps_converted, NULL);

   g_mutex_free (parset->caps_lock);

   G_OBJECT_CLASS (parent_class)->finalize (object);
 }

 static GstFlowReturn
 rsn_parsetter_chain (GstPad * pad, GstBuffer * buf)
 {
   RsnParSetter *parset = RSN_PARSETTER (GST_OBJECT_PARENT (pad));
   RsnMetaWrapped *meta;

   meta = RSN_META_WRAPPED_GET (buf);

   /* If this is a buffer we wrapped up earlier, unwrap it now */
   if (meta != NULL) {
     GstBuffer *wrap_buf = buf;

     if (meta->owner == GST_ELEMENT (parset)) {
       buf = rsn_meta_wrapped_unwrap_and_unref (wrap_buf, meta);
       GST_DEBUG_OBJECT (parset, "Unwrapping %p yields buffer %p with caps %"
           GST_PTR_FORMAT, wrap_buf, buf, GST_BUFFER_CAPS (buf));
     }
   }

   if (parset->outcaps != GST_BUFFER_CAPS (buf)) {
     if (parset->override_outcaps == FALSE &&
         gst_caps_is_equal (parset->outcaps, GST_BUFFER_CAPS (buf))) {
       /* Just update our output caps var */
       gst_caps_replace (&parset->outcaps, GST_BUFFER_CAPS (buf));
       goto out;
     }

     /* Replace the caps on the output buffer */
     buf = gst_buffer_make_metadata_writable (buf);
     gst_buffer_set_caps (buf, parset->outcaps);

     GST_DEBUG_OBJECT (parset,
         "Replacing caps on buffer %p with caps %" GST_PTR_FORMAT,
         buf, parset->outcaps);
   }

 out:
   return gst_pad_push (parset->srcpad, buf);
 }

 static gboolean
 rsn_parsetter_sink_event (GstPad * pad, GstEvent * event)
 {
   RsnParSetter *parset = RSN_PARSETTER (gst_pad_get_parent (pad));
   const GstStructure *structure = gst_event_get_structure (event);

   if (structure != NULL &&
       gst_structure_has_name (structure, "application/x-gst-dvd")) {
     const char *type = gst_structure_get_string (structure, "event");
     if (type == NULL)
       goto out;

     if (strcmp (type, "dvd-video-format") == 0) {
       gboolean is_widescreen;

       gst_structure_get_boolean (structure, "video-widescreen", &is_widescreen);

       GST_DEBUG_OBJECT (parset, "Video is %s",
           parset->is_widescreen ? "16:9" : "4:3");

       g_mutex_lock (parset->caps_lock);
       if (parset->is_widescreen != is_widescreen) {
         /* Force caps check */
         gst_caps_replace (&parset->in_caps_last, NULL);
         gst_caps_replace (&parset->in_caps_converted, NULL);
       }
       parset->is_widescreen = is_widescreen;

       /* FIXME: Added for testing: */
       // parset->is_widescreen = FALSE;

       g_mutex_unlock (parset->caps_lock);
     }
   }

 out:
   gst_object_unref (GST_OBJECT (parset));
   return gst_pad_event_default (pad, event);
 }

 static GstCaps *
 rsn_parsetter_src_getcaps (GstPad * pad)
 {
   RsnParSetter *parset = RSN_PARSETTER (gst_pad_get_parent (pad));
   GstCaps *ret;
   const GstCaps *templ_caps = gst_pad_get_pad_template_caps (pad);

   ret = gst_pad_peer_get_caps (parset->sinkpad);
   if (ret == NULL)
     ret = gst_caps_copy (templ_caps);
   else {
     GstCaps *temp;
     temp = gst_caps_intersect (templ_caps, ret);
     gst_caps_unref (ret);
     ret = rsn_parsetter_convert_caps (parset, temp, parset->is_widescreen);
     gst_caps_unref (temp);
   }

   gst_object_unref (parset);
   return ret;
 }

 static gboolean
 rsn_parsetter_check_caps (RsnParSetter * parset, GstCaps * caps)
 {
   GstStructure *s;
   gint width, height;
   gint par_n, par_d;
   guint dar_n, dar_d;
   gboolean ret = FALSE;

   g_mutex_lock (parset->caps_lock);

   if (caps == parset->in_caps_last ||
       gst_caps_is_equal (caps, parset->in_caps_last)) {
     ret = parset->in_caps_was_ok;
     goto out;
   }

   /* Calculate the DAR from the incoming caps, and return TRUE if it matches
    * the required DAR, FALSE if not */
   s = gst_caps_get_structure (caps, 0);
   if (s == NULL)
     goto out;

   if (!gst_structure_get_int (s, "width", &width) ||
       !gst_structure_get_int (s, "height", &height))
     goto out;

   if (!gst_structure_get_fraction (s, "pixel-aspect-ratio", &par_n, &par_d))
     par_n = par_d = 1;

   if (!gst_video_calculate_display_ratio (&dar_n, &dar_d, width, height,
           par_n, par_d, 1, 1))
     goto out;

   GST_DEBUG_OBJECT (parset,
       "Incoming video caps now: w %d h %d PAR %d/%d = DAR %d/%d",
       width, height, par_n, par_d, dar_n, dar_d);

   if (parset->is_widescreen) {
     if (dar_n == 16 && dar_d == 9)
       ret = TRUE;
   } else {
     if (dar_n == 4 && dar_d == 3)
       ret = TRUE;
   }

   gst_caps_replace (&parset->in_caps_last, caps);
   gst_caps_replace (&parset->in_caps_converted, NULL);
   parset->in_caps_was_ok = ret;

 out:
   g_mutex_unlock (parset->caps_lock);
   return ret;
 }

 static GstCaps *
 rsn_parsetter_convert_caps (RsnParSetter * parset, GstCaps * caps,
     gboolean widescreen)
 {
   /* Duplicate the given caps, with a PAR that provides the desired DAR */
   GstCaps *outcaps;
   GstStructure *s;
   gint width, height;
   gint par_n, par_d;
   guint dar_n, dar_d;
   GValue par = { 0, };

   g_mutex_lock (parset->caps_lock);
   if (caps == parset->in_caps_last && parset->in_caps_converted) {
     outcaps = gst_caps_ref (parset->in_caps_converted);
     goto out;
   }

   outcaps = gst_caps_copy (caps);

   /* Calculate the DAR from the incoming caps, and return TRUE if it matches
    * the required DAR, FALSE if not */
   s = gst_caps_get_structure (outcaps, 0);
   if (s == NULL)
     goto out;

   if (!gst_structure_get_int (s, "width", &width) ||
       !gst_structure_get_int (s, "height", &height))
     goto out;

   if (widescreen) {
     dar_n = 16;
     dar_d = 9;
   } else {
     dar_n = 4;
     dar_d = 3;
   }

   par_n = dar_n * height;
   par_d = dar_d * width;

   g_value_init (&par, GST_TYPE_FRACTION);
   gst_value_set_fraction (&par, par_n, par_d);
   gst_structure_set_value (s, "pixel-aspect-ratio", &par);
   g_value_unset (&par);

   gst_caps_replace (&parset->in_caps_converted, outcaps);
 out:
   g_mutex_unlock (parset->caps_lock);
   return outcaps;
 }

 static gboolean
 rsn_parsetter_sink_setcaps (GstPad * pad, GstCaps * caps)
 {
   /* Check the new incoming caps against our current DAR, and mark
    * whether the buffers will need adjusting */
   RsnParSetter *parset = RSN_PARSETTER (gst_pad_get_parent (pad));

   if (rsn_parsetter_check_caps (parset, caps)) {
     parset->override_outcaps = FALSE;
     gst_caps_replace (&parset->outcaps, caps);
   } else {
     GstCaps *override_caps = rsn_parsetter_convert_caps (parset, caps,
         parset->is_widescreen);
     if (parset->outcaps)
       gst_caps_unref (parset->outcaps);
     parset->outcaps = override_caps;

     parset->override_outcaps = TRUE;
   }

   GST_DEBUG_OBJECT (parset, "caps changed: need_override now = %d",
       parset->override_outcaps);

   gst_object_unref (parset);
   return TRUE;
 }

 static GstFlowReturn
 rsn_parsetter_sink_bufferalloc (GstPad * pad, guint64 offset, guint size,
     GstCaps * caps, GstBuffer ** buf)
 {
   RsnParSetter *parset = RSN_PARSETTER (gst_pad_get_parent (pad));
   GstFlowReturn ret;

   GST_LOG_OBJECT (parset, "Entering bufferalloc");

   if (rsn_parsetter_check_caps (parset, caps)) {
     ret = gst_pad_alloc_buffer (parset->srcpad, offset, size, caps, buf);
     GST_LOG_OBJECT (parset, "Not wrapping buf %p", *buf);
   } else {
     /* Allocate and wrap a downstream buffer */
     GstBuffer *orig_buf;
     GstBuffer *outbuf;
     GstCaps *override_caps = rsn_parsetter_convert_caps (parset, caps,
         parset->is_widescreen);

     ret = gst_pad_alloc_buffer (parset->srcpad, offset, size,
         override_caps, &orig_buf);
     gst_caps_unref (override_caps);

     if (ret != GST_FLOW_OK)
       return ret;

     outbuf = rsn_wrapped_buffer_new (orig_buf, GST_ELEMENT_CAST (parset));
     if (!outbuf) {
       /* FIXME: Throw error */
       return GST_FLOW_ERROR;
     }

     gst_buffer_set_caps (outbuf, caps);

     GST_LOG_OBJECT (parset,
         "Wrapped ds buf %p with caps %" GST_PTR_FORMAT
         " into new buf %p with caps %" GST_PTR_FORMAT,
         orig_buf, GST_BUFFER_CAPS (orig_buf), outbuf, GST_BUFFER_CAPS (outbuf));

     *buf = outbuf;
   }

   gst_object_unref (GST_OBJECT (parset));

   return ret;
 }
	/*
	* Copyright (C) 2008 Jan Schmidt <thaytan@noraisin.net>
	*/

	#ifdef HAVE_CONFIG_H
	# include <config.h>
	#endif

	#include <gst/gst.h>
	#include <gst/glib-compat-private.h>
	#include <gst/video/video.h>
	#include <string.h>

	#include "rsnparsetter.h"
	#include "rsnwrappedbuffer.h"

	GST_DEBUG_CATEGORY_STATIC (rsn_parsetter_debug);
	#define GST_CAT_DEFAULT rsn_parsetter_debug

	static GstStaticPadTemplate sink_factory = GST_STATIC_PAD_TEMPLATE ("sink",
	GST_PAD_SINK,
	GST_PAD_ALWAYS,
	GST_STATIC_CAPS ("video/x-raw-rgb; video/x-raw-yuv")
	);

	static GstStaticPadTemplate src_factory = GST_STATIC_PAD_TEMPLATE ("src",
	GST_PAD_SRC,
	GST_PAD_ALWAYS,
	GST_STATIC_CAPS ("video/x-raw-rgb; video/x-raw-yuv")
	);

	static void rsn_parsetter_register_extra (GType rsn_parsetter_type);

	GST_BOILERPLATE_FULL (RsnParSetter, rsn_parsetter, GstElement,
	GST_TYPE_ELEMENT, rsn_parsetter_register_extra);

	static void rsn_parsetter_finalize (GObject * object);
	static GstFlowReturn rsn_parsetter_chain (GstPad * pad, GstBuffer * buf);
	static gboolean rsn_parsetter_sink_event (GstPad * pad, GstEvent * event);
	static gboolean rsn_parsetter_sink_setcaps (GstPad * pad, GstCaps * caps);
	static GstFlowReturn rsn_parsetter_sink_bufferalloc (GstPad * pad,
	guint64 offset, guint size, GstCaps * caps, GstBuffer ** buf);

	static GstCaps rsn_parsetter_src_getcaps (GstPad pad);
	static GstCaps rsn_parsetter_convert_caps (RsnParSetter parset,
	GstCaps * caps, gboolean widescreen);
	static gboolean rsn_parsetter_check_caps (RsnParSetter * parset,
	GstCaps * caps);

	static void
	rsn_parsetter_register_extra (GType rsn_parsetter_type)
	{
	GST_DEBUG_CATEGORY_INIT (rsn_parsetter_debug, "rsnparsetter", 0,
	"Resin DVD aspect ratio adjuster");
	}

	static void
	rsn_parsetter_base_init (gpointer gclass)
	{

	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_simple (element_class,
	"Resin Aspect Ratio Setter", "Filter/Video",
	"Overrides caps on video buffers to force a particular display ratio",
	"Jan Schmidt <thaytan@noraisin.net>");
	}

	static void
	rsn_parsetter_class_init (RsnParSetterClass * klass)
	{
	GObjectClass *gobject_class;

	gobject_class = (GObjectClass *) klass;

	gobject_class->finalize = rsn_parsetter_finalize;
	}

	static void
	rsn_parsetter_init (RsnParSetter * parset, RsnParSetterClass * gclass)
	{
	parset->sinkpad = gst_pad_new_from_static_template (&sink_factory, "sink");
	gst_pad_set_getcaps_function (parset->sinkpad,
	GST_DEBUG_FUNCPTR (gst_pad_proxy_getcaps));
	gst_pad_set_chain_function (parset->sinkpad,
	GST_DEBUG_FUNCPTR (rsn_parsetter_chain));
	gst_pad_set_event_function (parset->sinkpad,
	GST_DEBUG_FUNCPTR (rsn_parsetter_sink_event));
	gst_pad_set_setcaps_function (parset->sinkpad,
	GST_DEBUG_FUNCPTR (rsn_parsetter_sink_setcaps));
	gst_pad_set_bufferalloc_function (parset->sinkpad,
	GST_DEBUG_FUNCPTR (rsn_parsetter_sink_bufferalloc));
	gst_element_add_pad (GST_ELEMENT (parset), parset->sinkpad);

	parset->srcpad = gst_pad_new_from_static_template (&src_factory, "src");
	gst_pad_set_getcaps_function (parset->srcpad,
	GST_DEBUG_FUNCPTR (rsn_parsetter_src_getcaps));
	gst_element_add_pad (GST_ELEMENT (parset), parset->srcpad);

	parset->caps_lock = g_mutex_new ();
	}

	static void
	rsn_parsetter_finalize (GObject * object)
	{
	RsnParSetter *parset = RSN_PARSETTER (object);

	gst_caps_replace (&parset->outcaps, NULL);
	gst_caps_replace (&parset->in_caps_last, NULL);
	gst_caps_replace (&parset->in_caps_converted, NULL);

	g_mutex_free (parset->caps_lock);

	G_OBJECT_CLASS (parent_class)->finalize (object);
	}

	static GstFlowReturn
	rsn_parsetter_chain (GstPad * pad, GstBuffer * buf)
	{
	RsnParSetter *parset = RSN_PARSETTER (GST_OBJECT_PARENT (pad));
	RsnMetaWrapped *meta;

	meta = RSN_META_WRAPPED_GET (buf);

	/* If this is a buffer we wrapped up earlier, unwrap it now */
	if (meta != NULL) {
	GstBuffer *wrap_buf = buf;

	if (meta->owner == GST_ELEMENT (parset)) {
	buf = rsn_meta_wrapped_unwrap_and_unref (wrap_buf, meta);
	GST_DEBUG_OBJECT (parset, "Unwrapping %p yields buffer %p with caps %"
	GST_PTR_FORMAT, wrap_buf, buf, GST_BUFFER_CAPS (buf));
	}
	}

	if (parset->outcaps != GST_BUFFER_CAPS (buf)) {
	if (parset->override_outcaps == FALSE &&
	gst_caps_is_equal (parset->outcaps, GST_BUFFER_CAPS (buf))) {
	/* Just update our output caps var */
	gst_caps_replace (&parset->outcaps, GST_BUFFER_CAPS (buf));
	goto out;
	}

	/* Replace the caps on the output buffer */
	buf = gst_buffer_make_metadata_writable (buf);
	gst_buffer_set_caps (buf, parset->outcaps);

	GST_DEBUG_OBJECT (parset,
	"Replacing caps on buffer %p with caps %" GST_PTR_FORMAT,
	buf, parset->outcaps);
	}

	out:
	return gst_pad_push (parset->srcpad, buf);
	}

	static gboolean
	rsn_parsetter_sink_event (GstPad * pad, GstEvent * event)
	{
	RsnParSetter *parset = RSN_PARSETTER (gst_pad_get_parent (pad));
	const GstStructure *structure = gst_event_get_structure (event);

	if (structure != NULL &&
	gst_structure_has_name (structure, "application/x-gst-dvd")) {
	const char *type = gst_structure_get_string (structure, "event");
	if (type == NULL)
	goto out;

	if (strcmp (type, "dvd-video-format") == 0) {
	gboolean is_widescreen;

	gst_structure_get_boolean (structure, "video-widescreen", &is_widescreen);

	GST_DEBUG_OBJECT (parset, "Video is %s",
	parset->is_widescreen ? "16:9" : "4:3");

	g_mutex_lock (parset->caps_lock);
	if (parset->is_widescreen != is_widescreen) {
	/* Force caps check */
	gst_caps_replace (&parset->in_caps_last, NULL);
	gst_caps_replace (&parset->in_caps_converted, NULL);
	}
	parset->is_widescreen = is_widescreen;

	/* FIXME: Added for testing: */
	// parset->is_widescreen = FALSE;

	g_mutex_unlock (parset->caps_lock);
	}
	}

	out:
	gst_object_unref (GST_OBJECT (parset));
	return gst_pad_event_default (pad, event);
	}

	static GstCaps *
	rsn_parsetter_src_getcaps (GstPad * pad)
	{
	RsnParSetter *parset = RSN_PARSETTER (gst_pad_get_parent (pad));
	GstCaps *ret;
	const GstCaps *templ_caps = gst_pad_get_pad_template_caps (pad);

	ret = gst_pad_peer_get_caps (parset->sinkpad);
	if (ret == NULL)
	ret = gst_caps_copy (templ_caps);
	else {
	GstCaps *temp;
	temp = gst_caps_intersect (templ_caps, ret);
	gst_caps_unref (ret);
	ret = rsn_parsetter_convert_caps (parset, temp, parset->is_widescreen);
	gst_caps_unref (temp);
	}

	gst_object_unref (parset);
	return ret;
	}

	static gboolean
	rsn_parsetter_check_caps (RsnParSetter * parset, GstCaps * caps)
	{
	GstStructure *s;
	gint width, height;
	gint par_n, par_d;
	guint dar_n, dar_d;
	gboolean ret = FALSE;

	g_mutex_lock (parset->caps_lock);

	if (caps == parset->in_caps_last \|\|
	gst_caps_is_equal (caps, parset->in_caps_last)) {
	ret = parset->in_caps_was_ok;
	goto out;
	}

	/* Calculate the DAR from the incoming caps, and return TRUE if it matches
	* the required DAR, FALSE if not */
	s = gst_caps_get_structure (caps, 0);
	if (s == NULL)
	goto out;

	if (!gst_structure_get_int (s, "width", &width) \|\|
	!gst_structure_get_int (s, "height", &height))
	goto out;

	if (!gst_structure_get_fraction (s, "pixel-aspect-ratio", &par_n, &par_d))
	par_n = par_d = 1;

	if (!gst_video_calculate_display_ratio (&dar_n, &dar_d, width, height,
	par_n, par_d, 1, 1))
	goto out;

	GST_DEBUG_OBJECT (parset,
	"Incoming video caps now: w %d h %d PAR %d/%d = DAR %d/%d",
	width, height, par_n, par_d, dar_n, dar_d);

	if (parset->is_widescreen) {
	if (dar_n == 16 && dar_d == 9)
	ret = TRUE;
	} else {
	if (dar_n == 4 && dar_d == 3)
	ret = TRUE;
	}

	gst_caps_replace (&parset->in_caps_last, caps);
	gst_caps_replace (&parset->in_caps_converted, NULL);
	parset->in_caps_was_ok = ret;

	out:
	g_mutex_unlock (parset->caps_lock);
	return ret;
	}

	static GstCaps *
	rsn_parsetter_convert_caps (RsnParSetter * parset, GstCaps * caps,
	gboolean widescreen)
	{
	/* Duplicate the given caps, with a PAR that provides the desired DAR */
	GstCaps *outcaps;
	GstStructure *s;
	gint width, height;
	gint par_n, par_d;
	guint dar_n, dar_d;
	GValue par = { 0, };

	g_mutex_lock (parset->caps_lock);
	if (caps == parset->in_caps_last && parset->in_caps_converted) {
	outcaps = gst_caps_ref (parset->in_caps_converted);
	goto out;
	}

	outcaps = gst_caps_copy (caps);

	/* Calculate the DAR from the incoming caps, and return TRUE if it matches
	* the required DAR, FALSE if not */
	s = gst_caps_get_structure (outcaps, 0);
	if (s == NULL)
	goto out;

	if (!gst_structure_get_int (s, "width", &width) \|\|
	!gst_structure_get_int (s, "height", &height))
	goto out;

	if (widescreen) {
	dar_n = 16;
	dar_d = 9;
	} else {
	dar_n = 4;
	dar_d = 3;
	}

	par_n = dar_n * height;
	par_d = dar_d * width;

	g_value_init (&par, GST_TYPE_FRACTION);
	gst_value_set_fraction (&par, par_n, par_d);
	gst_structure_set_value (s, "pixel-aspect-ratio", &par);
	g_value_unset (&par);

	gst_caps_replace (&parset->in_caps_converted, outcaps);
	out:
	g_mutex_unlock (parset->caps_lock);
	return outcaps;
	}

	static gboolean
	rsn_parsetter_sink_setcaps (GstPad * pad, GstCaps * caps)
	{
	/* Check the new incoming caps against our current DAR, and mark
	* whether the buffers will need adjusting */
	RsnParSetter *parset = RSN_PARSETTER (gst_pad_get_parent (pad));

	if (rsn_parsetter_check_caps (parset, caps)) {
	parset->override_outcaps = FALSE;
	gst_caps_replace (&parset->outcaps, caps);
	} else {
	GstCaps *override_caps = rsn_parsetter_convert_caps (parset, caps,
	parset->is_widescreen);
	if (parset->outcaps)
	gst_caps_unref (parset->outcaps);
	parset->outcaps = override_caps;

	parset->override_outcaps = TRUE;
	}

	GST_DEBUG_OBJECT (parset, "caps changed: need_override now = %d",
	parset->override_outcaps);

	gst_object_unref (parset);
	return TRUE;
	}

	static GstFlowReturn
	rsn_parsetter_sink_bufferalloc (GstPad * pad, guint64 offset, guint size,
	GstCaps * caps, GstBuffer ** buf)
	{
	RsnParSetter *parset = RSN_PARSETTER (gst_pad_get_parent (pad));
	GstFlowReturn ret;

	GST_LOG_OBJECT (parset, "Entering bufferalloc");

	if (rsn_parsetter_check_caps (parset, caps)) {
	ret = gst_pad_alloc_buffer (parset->srcpad, offset, size, caps, buf);
	GST_LOG_OBJECT (parset, "Not wrapping buf %p", *buf);
	} else {
	/* Allocate and wrap a downstream buffer */
	GstBuffer *orig_buf;
	GstBuffer *outbuf;
	GstCaps *override_caps = rsn_parsetter_convert_caps (parset, caps,
	parset->is_widescreen);

	ret = gst_pad_alloc_buffer (parset->srcpad, offset, size,
	override_caps, &orig_buf);
	gst_caps_unref (override_caps);

	if (ret != GST_FLOW_OK)
	return ret;

	outbuf = rsn_wrapped_buffer_new (orig_buf, GST_ELEMENT_CAST (parset));
	if (!outbuf) {
	/* FIXME: Throw error */
	return GST_FLOW_ERROR;
	}

	gst_buffer_set_caps (outbuf, caps);

	GST_LOG_OBJECT (parset,
	"Wrapped ds buf %p with caps %" GST_PTR_FORMAT
	" into new buf %p with caps %" GST_PTR_FORMAT,
	orig_buf, GST_BUFFER_CAPS (orig_buf), outbuf, GST_BUFFER_CAPS (outbuf));

	*buf = outbuf;
	}

	gst_object_unref (GST_OBJECT (parset));

	return ret;
	}