gstreamer/gst/vbidec/gstvbidec.c
2012-04-05 18:02:56 +02:00

381 lines
10 KiB
C

/* 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#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(klass) \
(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);
/* VBIDec signals and args */
enum
{
LAST_SIGNAL
};
enum
{
ARG_0,
ARG_VERBOSE,
ARG_CAPTION_TYPE,
ARG_DVD_INPUT
};
static GstStaticPadTemplate gst_vbidec_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS_ANY);
static GstStaticPadTemplate gst_vbidec_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("text/plain")
);
#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_base_init (gpointer g_class);
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, GstData * _data);
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),
gst_vbidec_base_init,
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_base_init (gpointer g_class)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_set_details_simple (element_class, "VBI decoder",
"Codec/Decoder/Video",
"Decodes closed captions and XDS data from VBI data",
"David I. Lehn <dlehn@users.sourceforge.net>");
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_vbidec_src_template));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_vbidec_sink_template));
}
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_peek_parent (klass);
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_VERBOSE,
g_param_spec_boolean ("verbose", "verbose", "verbose",
FALSE, G_PARAM_WRITABLE | G_PARAM_STATIC_STRINGS));
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_PARAM_STATIC_STRINGS));
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 | G_PARAM_STATIC_STRINGS));
}
static void
gst_vbidec_init (GstVBIDec * vbidec)
{
/* create the sink and src pads */
vbidec->sinkpad =
gst_pad_new_from_static_template (&gst_vbidec_sink_template, "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_static_template (&gst_vbidec_src_template, "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, GstData * _data)
{
GstBuffer *buf = GST_BUFFER (_data);
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, GST_DATA (buf));
}
}
}
static void
gst_vbidec_set_property (GObject * object, guint prop_id, const GValue * value,
GParamSpec * pspec)
{
GstVBIDec *vbidec;
g_return_if_fail (GST_IS_VBIDEC (object));
vbidec = GST_VBIDEC (object);
switch (prop_id) {
case ARG_VERBOSE:
vbidata_set_verbose (vbidec->vbidata, g_value_get_boolean (value));
vbiscreen_set_verbose (vbidec->vbiscreen, g_value_get_boolean (value));
break;
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;
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 (GstPlugin * plugin)
{
return gst_element_register (plugin, "vbidec", GST_RANK_NONE,
GST_TYPE_VBIDEC);
}
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
GST_VERSION_MINOR,
vbidec,
"Decodes closed captions and XDS data from VBI data",
plugin_init, VERSION, "GPL", GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)