initial checkin of work-in-progress vbidec plugin for closed caption support

Original commit message from CVS:
initial checkin of work-in-progress vbidec plugin for closed caption support

1 files changed, 372 insertions, 0 deletions

diff --git a/gst/vbidec/gstvbidec.c b/gst/vbidec/gstvbidec.c
new file mode 100644
index 00000000..1da10543
--- /dev/null
+++ b/gst/vbidec/gstvbidec.c
@@ -0,0 +1,372 @@
+/* GStreamer
+ * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
+ *
+ * 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.
+ */
+
+#include <config.h>
+#include <string.h>
+#include <inttypes.h>
+#include <ctype.h>
+#include <gst/gst.h>
+#include "gstvbidec.h"
+#include "vbidata.h"
+#include "vbiscreen.h"
+
+#define GST_TYPE_VBIDEC \
+  (gst_vbidec_get_type())
+#define GST_VBIDEC(obj) \
+  (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_VBIDEC,GstVBIDec))
+#define GST_VBIDEC_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_VBIDEC,GstVBIDec))
+#define GST_IS_VBIDEC(obj) \
+  (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_VBIDEC))
+#define GST_IS_VBIDEC_CLASS(obj) \
+  (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_VBIDEC))
+
+//typedef struct _GstVBIDec GstVBIDec;
+typedef struct _GstVBIDecClass GstVBIDecClass;
+
+struct _GstVBIDec {
+  GstElement 	 element;
+
+  /* pads */
+  GstPad 	*sinkpad,
+  		*srcpad;
+  char		caption[128];
+  vbiscreen_t	*vbiscreen;
+  vbidata_t	*vbidata;
+  int		caption_type;
+  gboolean	dvd_input;
+};
+
+struct _GstVBIDecClass {
+  GstElementClass parent_class;
+};
+
+GType gst_vbidec_get_type(void);
+
+/* elementfactory information */
+static GstElementDetails gst_vbidec_details = {
+  "VBI decoder",
+  "Codec/Video/Decoder",
+  "GPL",
+  "Decodes closed captions and XDS data from VBI data",
+  VERSION,
+  "David I. Lehn <dlehn@users.sourceforge.net>",
+  "(C) 2002"
+};
+
+/* VBIDec signals and args */
+enum {
+  LAST_SIGNAL
+};
+
+enum {
+  ARG_0,
+  ARG_CAPTION_TYPE,
+  ARG_DVD_INPUT
+};
+
+GST_PAD_TEMPLATE_FACTORY (sink_template_factory,
+  "sink",
+  GST_PAD_SINK,
+  GST_PAD_ALWAYS,
+  GST_CAPS_NEW (
+    "vbidec_sink",
+    "application/octet-stream",
+    NULL
+  )
+);
+
+GST_PAD_TEMPLATE_FACTORY (src_template_factory,
+  "src",
+  GST_PAD_SRC,
+  GST_PAD_ALWAYS,
+  GST_CAPS_NEW (
+    "vbidec_src",
+    "text/plain",
+    NULL
+  )
+);
+
+
+#define GST_TYPE_VBIDEC_CAPTION_TYPE_TYPE (gst_vbidec_caption_type_get_type())
+static GType
+gst_vbidec_caption_type_get_type (void)
+{
+  static GType vbidec_caption_type_type = 0;
+  static GEnumValue vbidec_caption_type[] = {
+    { CAPTURE_OFF, "0", "Closed Captions off"},
+    { CAPTURE_CC1, "1", "Closed Caption CC1"},
+    { CAPTURE_CC2, "2", "Closed Caption CC2"},
+    { CAPTURE_CC3, "4", "Closed Caption CC3"},
+    { CAPTURE_CC4, "5", "Closed Caption CC4"},
+    { CAPTURE_T1,  "6", "Closed Caption T1"},
+    { CAPTURE_T2,  "7", "Closed Caption T2"},
+    { CAPTURE_T3,  "8", "Closed Caption T3"},
+    { CAPTURE_T4,  "9", "Closed Caption T4"},
+    {0, NULL, NULL},
+  };
+  if (!vbidec_caption_type_type) {
+    vbidec_caption_type_type = g_enum_register_static ("GstVBIDecCaptionTypeType", vbidec_caption_type);
+  }
+  return vbidec_caption_type_type;
+}
+
+static void		gst_vbidec_class_init		(GstVBIDecClass *klass);
+static void		gst_vbidec_init		(GstVBIDec *vbidec);
+
+static void		gst_vbidec_set_property	(GObject *object, guint prop_id, 
+							 const GValue *value, GParamSpec *pspec);
+static void		gst_vbidec_get_property	(GObject *object, guint prop_id, 
+							 GValue *value, GParamSpec *pspec);
+
+static void		gst_vbidec_chain		(GstPad *pad, GstBuffer *buffer);
+
+static GstElementClass *parent_class = NULL;
+/*static guint gst_vbidec_signals[LAST_SIGNAL] = { 0 };*/
+
+GType
+gst_vbidec_get_type (void)
+{
+  static GType vbidec_type = 0;
+
+  if (!vbidec_type) {
+    static const GTypeInfo vbidec_info = {
+      sizeof(GstVBIDecClass),      
+      NULL,
+      NULL,
+      (GClassInitFunc)gst_vbidec_class_init,
+      NULL,
+      NULL,
+      sizeof(GstVBIDec),
+      0,
+      (GInstanceInitFunc)gst_vbidec_init,
+    };
+    vbidec_type = g_type_register_static(GST_TYPE_ELEMENT, "GstVBIDec", &vbidec_info, 0);
+  }
+  return vbidec_type;
+}
+
+static void
+gst_vbidec_class_init(GstVBIDecClass *klass)
+{
+  GObjectClass *gobject_class;
+  GstElementClass *gstelement_class;
+
+  gobject_class = (GObjectClass*)klass;
+  gstelement_class = (GstElementClass*)klass;
+
+  parent_class = g_type_class_ref(GST_TYPE_ELEMENT);
+
+  gobject_class->set_property 	= gst_vbidec_set_property;
+  gobject_class->get_property 	= gst_vbidec_get_property;
+
+  g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_CAPTION_TYPE,
+      g_param_spec_enum ("caption type", "caption type", "Closed Caption Type",
+        GST_TYPE_VBIDEC_CAPTION_TYPE_TYPE, CAPTURE_OFF, G_PARAM_READWRITE));
+  g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_DVD_INPUT,
+      g_param_spec_boolean ("dvd input", "dvd input", "VBI is encapsulated in MPEG2 GOP user_data field (as on DVDs)",
+        FALSE, G_PARAM_READWRITE));
+}
+
+static void
+gst_vbidec_init (GstVBIDec *vbidec)
+{
+  /* create the sink and src pads */
+  vbidec->sinkpad = gst_pad_new_from_template (
+		  GST_PAD_TEMPLATE_GET (sink_template_factory), "sink");
+  gst_element_add_pad (GST_ELEMENT (vbidec), vbidec->sinkpad);
+  gst_pad_set_chain_function (vbidec->sinkpad, GST_DEBUG_FUNCPTR (gst_vbidec_chain));
+
+  vbidec->srcpad = gst_pad_new_from_template (
+		  GST_PAD_TEMPLATE_GET (src_template_factory), "src");
+  gst_element_add_pad (GST_ELEMENT (vbidec), vbidec->srcpad);
+
+  vbidec->vbiscreen = vbiscreen_new(0, 0, 1.0, 0, (void *)vbidec);
+  vbidec->vbidata = vbidata_new_line(vbidec->vbiscreen, 0);
+  vbidec->caption_type = CAPTURE_OFF;
+  vbidata_capture_mode(vbidec->vbidata, vbidec->caption_type);
+  vbidec->dvd_input = FALSE;
+}
+
+static void
+line21_decode(GstVBIDec *vbidec, guint8 *data, guint32 size)
+{
+  vbidata_process_line(vbidec->vbidata, data, 0);
+}
+
+static void
+dvd_user_data_decode(GstVBIDec *vbidec, guint8 *data, guint32 size)
+{
+  //char caption[128];
+  //int ci; /* caption index */
+  int i; /* buf index */
+  int num_disp_field;
+  guint8 b1, b2;
+  int w;
+
+  //g_print("%%%% vbi decode\n");
+  //g_print("== %p %d\n", data, size);
+  i = 0;
+  /* Check for Closed Captioning data */
+  if (data[i] != 0x43 || data[i+1] != 0x43 ||
+      data[i+2] != 0x01 || data[i+3] != 0xf8) {
+    g_print ("non-CC data\n");
+    return;
+  }
+  //g_print ("CC data\n");
+  i += 4; /* above */
+  i += 4; /* ? */
+  num_disp_field = data[i] & 0x3f;
+  //g_print ("ndf %d\n", num_disp_field);
+  while ((data[i] & 0xfe) == 0xfe) {
+    if (data[i] & 0x1) {
+      b1 = data[i+1] & 0x7f;
+      b2 = data[i+2] & 0x7f;
+      w = (b2 << 8) | b1;
+      vbidata_process_16b(vbidec->vbidata, 0, w);
+    }
+    i += 3;
+  }
+}
+
+static void
+gst_vbidec_chain (GstPad *pad, GstBuffer *buf)
+{
+  GstVBIDec *vbidec = GST_VBIDEC (gst_pad_get_parent (pad));
+  guint32 size;
+  guint8 *data;
+  guint64 pts;
+
+  size = GST_BUFFER_SIZE (buf);
+  data = GST_BUFFER_DATA (buf);
+  pts = GST_BUFFER_TIMESTAMP (buf);
+
+  /*
+  g_print("** user_data: addr:%p len:%d state:%d\n", data, size, 0);
+  {
+  int i;
+  guint8 ud;
+  g_print("** \"");
+  for (i=0; i<size; i++) {
+    ud = data[i];
+    if (isprint((char)ud)) {
+      g_print("%c", (char)ud);
+    } else {
+      g_print("[0x%02x]", ud);
+    }
+  }
+  g_print("\"\n");
+  }
+  */
+
+  if (vbidec->dvd_input) {
+    dvd_user_data_decode(vbidec, data, size);
+  } else {
+    line21_decode(vbidec, data, size);
+  }
+
+  gst_buffer_unref(buf);
+}
+
+void
+gst_vbidec_show_text (GstVBIDec *vbidec, char *text, int len)
+{
+  //fprintf(stderr, "%*s\n", len, text);
+  if (len > 0) {
+    if (GST_PAD_IS_USABLE (vbidec->srcpad)) {
+      GstBuffer *buf = gst_buffer_new_and_alloc (len);
+      memcpy (GST_BUFFER_DATA (buf), text, len);
+      GST_BUFFER_SIZE (buf) = len;
+      // FIXME
+      //GST_BUFFER_TIMESTAMP (buf) = vbidec->...
+      //...
+      //fprintf(stderr, "vbi text pushed\n");
+      gst_pad_push (vbidec->srcpad, buf);
+    }
+  }
+}
+
+static void
+gst_vbidec_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec)
+{
+  GstVBIDec *vbidec;
+
+  /* it's not null if we got it, but it might not be ours */
+  g_return_if_fail (GST_IS_VBIDEC (object));
+  vbidec = GST_VBIDEC (object);
+
+  switch (prop_id) {
+    case ARG_DVD_INPUT:
+      vbidec->dvd_input = g_value_get_boolean(value);
+      break;
+    case ARG_CAPTION_TYPE:
+      vbidec->caption_type = g_value_get_enum(value);
+      vbidata_capture_mode(vbidec->vbidata, vbidec->caption_type);
+      break;
+    default:
+      break;
+  }
+}
+
+static void
+gst_vbidec_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
+{
+  GstVBIDec *vbidec;
+
+  /* it's not null if we got it, but it might not be ours */
+  g_return_if_fail (GST_IS_VBIDEC (object));
+  vbidec = GST_VBIDEC (object);
+
+  switch (prop_id) {
+    case ARG_DVD_INPUT:
+      g_value_set_boolean(value, vbidec->dvd_input);
+      break;
+    case ARG_CAPTION_TYPE:
+      g_value_set_enum(value, vbidec->caption_type);
+      break;
+    default:
+      break;
+  }
+}
+
+static gboolean
+plugin_init (GModule *module, GstPlugin *plugin)
+{
+  GstElementFactory *factory;
+
+  /* create an elementfactory for the vbidec element */
+  factory = gst_element_factory_new("vbidec",GST_TYPE_VBIDEC,
+                                   &gst_vbidec_details);
+  g_return_val_if_fail(factory != NULL, FALSE);
+  gst_element_factory_set_rank (factory, GST_ELEMENT_RANK_PRIMARY);
+
+  gst_element_factory_add_pad_template (factory, GST_PAD_TEMPLATE_GET (src_template_factory));
+  gst_element_factory_add_pad_template (factory, GST_PAD_TEMPLATE_GET (sink_template_factory));
+
+  gst_plugin_add_feature (plugin, GST_PLUGIN_FEATURE (factory));
+
+  return TRUE;
+}
+
+GstPluginDesc plugin_desc = {
+  GST_VERSION_MAJOR,
+  GST_VERSION_MINOR,
+  "vbidec",
+  plugin_init
+};