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gstreamer/gst/cdxaparse/gstcdxaparse.c
Christian Schaller 1d5f318e0d plugins part of license field patch 
Original commit message from CVS:
plugins part of license field patch
2002-09-18 19:02:52 +00:00

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/* GStreamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
* <2002> Wim Taymans <wim.taymans@chello.be>
*
* 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 <string.h>
#include "gstcdxaparse.h"
#define MAKE_FOUR_CC(a,b,c,d) ( ((guint32)a) | (((guint32)b)<< 8) | \
((guint32)c)<<16 | (((guint32)d)<<24) )
/* RIFF types */
#define GST_RIFF_TAG_RIFF MAKE_FOUR_CC('R','I','F','F')
#define GST_RIFF_RIFF_CDXA MAKE_FOUR_CC('C','D','X','A')
#define GST_RIFF_TAG_fmt MAKE_FOUR_CC('f','m','t',' ')
#define GST_RIFF_TAG_data MAKE_FOUR_CC('d','a','t','a')
/* elementfactory information */
static GstElementDetails gst_cdxa_parse_details = {
".dat parser",
"Codec/Parser",
"LGPL",
"Parse a .dat file (VCD) into raw mpeg1",
VERSION,
"Wim Taymans <wim.taymans@tvd.be>",
"(C) 2002",
};
static GstCaps* cdxa_type_find (GstBuffer *buf, gpointer private);
/* typefactory for 'cdxa' */
static GstTypeDefinition cdxadefinition = {
"cdxaparse_video/avi",
"video/avi",
".dat",
cdxa_type_find,
};
/* CDXAParse signals and args */
enum {
/* FILL ME */
LAST_SIGNAL
};
enum {
ARG_0,
/* FILL ME */
};
GST_PAD_TEMPLATE_FACTORY (sink_templ,
"sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_CAPS_NEW (
"cdxaparse_sink",
"video/avi",
"format", GST_PROPS_STRING ("CDXA")
)
)
GST_PAD_TEMPLATE_FACTORY (src_templ,
"src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_CAPS_NEW (
"cdxaparse_src",
"video/mpeg",
"mpegversion", GST_PROPS_INT (1),
"systemstream", GST_PROPS_BOOLEAN (TRUE)
)
)
static void gst_cdxa_parse_class_init (GstCDXAParseClass *klass);
static void gst_cdxa_parse_init (GstCDXAParse *cdxa_parse);
static void gst_cdxa_parse_loop (GstElement *element);
static GstElementStateReturn
gst_cdxa_parse_change_state (GstElement *element);
static GstElementClass *parent_class = NULL;
/*static guint gst_cdxa_parse_signals[LAST_SIGNAL] = { 0 }; */
GType
gst_cdxa_parse_get_type(void)
{
static GType cdxa_parse_type = 0;
if (!cdxa_parse_type) {
static const GTypeInfo cdxa_parse_info = {
sizeof(GstCDXAParseClass),
NULL,
NULL,
(GClassInitFunc)gst_cdxa_parse_class_init,
NULL,
NULL,
sizeof(GstCDXAParse),
0,
(GInstanceInitFunc)gst_cdxa_parse_init,
};
cdxa_parse_type = g_type_register_static(GST_TYPE_ELEMENT, "GstCDXAParse", &cdxa_parse_info, 0);
}
return cdxa_parse_type;
}
static void
gst_cdxa_parse_class_init (GstCDXAParseClass *klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = (GObjectClass*)klass;
gstelement_class = (GstElementClass*)klass;
parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
gstelement_class->change_state = gst_cdxa_parse_change_state;
}
static void
gst_cdxa_parse_init (GstCDXAParse *cdxa_parse)
{
GST_FLAG_SET (cdxa_parse, GST_ELEMENT_EVENT_AWARE);
cdxa_parse->sinkpad = gst_pad_new_from_template (
GST_PAD_TEMPLATE_GET (sink_templ), "sink");
gst_element_add_pad (GST_ELEMENT (cdxa_parse), cdxa_parse->sinkpad);
cdxa_parse->srcpad = gst_pad_new_from_template (
GST_PAD_TEMPLATE_GET (src_templ), "src");
gst_element_add_pad (GST_ELEMENT (cdxa_parse), cdxa_parse->srcpad);
gst_element_set_loop_function (GST_ELEMENT (cdxa_parse), gst_cdxa_parse_loop);
}
static GstCaps*
cdxa_type_find (GstBuffer *buf,
gpointer private)
{
gchar *data = GST_BUFFER_DATA (buf);
GstCaps *new;
GST_DEBUG (0,"cdxa_parse: typefind");
if (GUINT32_FROM_LE (((guint32 *)data)[0]) != GST_RIFF_TAG_RIFF)
return NULL;
if (GUINT32_FROM_LE (((guint32 *)data)[2]) != GST_RIFF_RIFF_CDXA)
return NULL;
new = GST_CAPS_NEW ("cdxa_type_find",
"video/avi",
"RIFF", GST_PROPS_STRING ("CDXA"));
return new;
}
static gboolean
gst_cdxa_parse_handle_event (GstCDXAParse *cdxa_parse)
{
guint32 remaining;
GstEvent *event;
GstEventType type;
gst_bytestream_get_status (cdxa_parse->bs, &remaining, &event);
type = event? GST_EVENT_TYPE (event) : GST_EVENT_UNKNOWN;
switch (type) {
case GST_EVENT_EOS:
gst_pad_event_default (cdxa_parse->sinkpad, event);
break;
case GST_EVENT_SEEK:
g_warning ("seek event\n");
break;
case GST_EVENT_FLUSH:
g_warning ("flush event\n");
break;
case GST_EVENT_DISCONTINUOUS:
g_warning ("discont event\n");
break;
default:
g_warning ("unhandled event %d\n", type);
break;
}
return TRUE;
}
/*
CDXA starts with the following header:
! RIFF:4 ! size:4 ! "CDXA" ! "fmt " ! size:4 ! (size+1)&~1 bytes of crap !
! "data" ! data_size:4 ! (data_size/2352) sectors...
*/
typedef struct
{
gchar RIFF_tag[4];
guint32 riff_size;
gchar CDXA_tag[4];
gchar fmt_tag[4];
guint32 fmt_size;
} CDXAParseHeader;
/*
A sectors is 2352 bytes long and is composed of:
! sync ! header ! subheader ! data ... ! edc !
! 12 bytes ! 4 bytes ! 8 bytes ! 2324 bytes ! 4 bytes !
!-------------------------------------------------------!
We parse the data out of it and send it to the srcpad.
*/
static void
gst_cdxa_parse_loop (GstElement *element)
{
GstCDXAParse *cdxa_parse;
CDXAParseHeader *header;
g_return_if_fail (element != NULL);
g_return_if_fail (GST_IS_CDXA_PARSE (element));
cdxa_parse = GST_CDXA_PARSE (element);
if (cdxa_parse->state == CDXA_PARSE_HEADER) {
guint32 fmt_size;
guint8 *buf;
guint32 got_bytes;
got_bytes = gst_bytestream_peek_bytes (cdxa_parse->bs, (guint8**)&header, 20);
if (got_bytes < 20)
return;
cdxa_parse->riff_size = GUINT32_FROM_LE (header->riff_size);
fmt_size = (GUINT32_FROM_LE (header->fmt_size) + 1)&~1;
/* flush the header + fmt_size bytes + 4 bytes "data" */
if (!gst_bytestream_flush (cdxa_parse->bs, 20 + fmt_size + 4))
return;
/* get the data size */
got_bytes = gst_bytestream_peek_bytes (cdxa_parse->bs, (guint8**)&buf, 4);
if (got_bytes < 4)
return;
cdxa_parse->data_size = GUINT32_FROM_LE (*((guint32 *)buf));
/* flush the data size */
if (!gst_bytestream_flush (cdxa_parse->bs, 4))
return;
if (cdxa_parse->data_size % CDXA_SECTOR_SIZE)
g_warning ("cdxa_parse: size not multiple of %d bytes", CDXA_SECTOR_SIZE);
cdxa_parse->sectors = cdxa_parse->data_size / CDXA_SECTOR_SIZE;
cdxa_parse->state = CDXA_PARSE_DATA;
}
else {
GstBuffer *buf;
GstBuffer *outbuf;
guint32 got_bytes;
got_bytes = gst_bytestream_read (cdxa_parse->bs, &buf, CDXA_SECTOR_SIZE);
if (got_bytes < CDXA_SECTOR_SIZE) {
gst_cdxa_parse_handle_event (cdxa_parse);
return;
}
outbuf = gst_buffer_create_sub (buf, 24, CDXA_DATA_SIZE);
gst_buffer_unref (buf);
gst_pad_push (cdxa_parse->srcpad, outbuf);
}
}
static GstElementStateReturn
gst_cdxa_parse_change_state (GstElement *element)
{
GstCDXAParse *cdxa_parse = GST_CDXA_PARSE (element);
switch (GST_STATE_TRANSITION (element)) {
case GST_STATE_NULL_TO_READY:
break;
case GST_STATE_READY_TO_PAUSED:
cdxa_parse->state = CDXA_PARSE_HEADER;
cdxa_parse->bs = gst_bytestream_new (cdxa_parse->sinkpad);
break;
case GST_STATE_PAUSED_TO_PLAYING:
break;
case GST_STATE_PLAYING_TO_PAUSED:
break;
case GST_STATE_PAUSED_TO_READY:
gst_bytestream_destroy (cdxa_parse->bs);
break;
case GST_STATE_READY_TO_NULL:
break;
default:
break;
}
parent_class->change_state (element);
return GST_STATE_SUCCESS;
}
static gboolean
plugin_init (GModule *module, GstPlugin *plugin)
{
GstElementFactory *factory;
GstTypeFactory *type;
/* this filter needs the riff parser */
if (!gst_library_load ("gstbytestream"))
return FALSE;
/* create an elementfactory for the cdxa_parse element */
factory = gst_element_factory_new ("cdxaparse", GST_TYPE_CDXA_PARSE,
&gst_cdxa_parse_details);
g_return_val_if_fail (factory != NULL, FALSE);
gst_element_factory_add_pad_template (factory, GST_PAD_TEMPLATE_GET (src_templ));
gst_element_factory_add_pad_template (factory, GST_PAD_TEMPLATE_GET (sink_templ));
type = gst_type_factory_new (&cdxadefinition);
gst_plugin_add_feature (plugin, GST_PLUGIN_FEATURE (type));
gst_plugin_add_feature (plugin, GST_PLUGIN_FEATURE (factory));
return TRUE;
}
GstPluginDesc plugin_desc = {
GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"cdxaparse",
plugin_init
};
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