gstreamer/gst/auparse/gstauparse.c

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/* 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.
*/
/* 2001/04/03 - Updated parseau to use caps nego
* Zaheer Merali <zaheer@grid9.net
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdlib.h>
#include <string.h>
#include <gstauparse.h>
#include <gst/audio/audio.h>
/* elementfactory information */
static GstElementDetails gst_auparse_details = GST_ELEMENT_DETAILS (
".au parser",
"Codec/Parser/Audio",
"Parse an .au file into raw audio",
"Erik Walthinsen <omega@cse.ogi.edu>"
);
static GstStaticPadTemplate gst_auparse_sink_template =
GST_STATIC_PAD_TEMPLATE (
"sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ( "audio/x-au" )
);
static GstStaticPadTemplate gst_auparse_src_template =
GST_STATIC_PAD_TEMPLATE (
"src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (
GST_AUDIO_INT_PAD_TEMPLATE_CAPS "; "
"audio/x-alaw, "
"rate = (int) [ 8000, 48000 ], "
"channels = (int) [ 1, 2 ]"
)
);
/* AuParse signals and args */
enum {
/* FILL ME */
LAST_SIGNAL
};
enum {
ARG_0,
/* FILL ME */
};
static void gst_auparse_base_init (gpointer g_class);
static void gst_auparse_class_init (GstAuParseClass *klass);
static void gst_auparse_init (GstAuParse *auparse);
static void gst_auparse_chain (GstPad *pad,GstData *_data);
static GstElementClass *parent_class = NULL;
/*static guint gst_auparse_signals[LAST_SIGNAL] = { 0 }; */
GType
gst_auparse_get_type (void)
{
static GType auparse_type = 0;
if (!auparse_type) {
static const GTypeInfo auparse_info = {
sizeof(GstAuParseClass),
gst_auparse_base_init,
NULL,
(GClassInitFunc) gst_auparse_class_init,
NULL,
NULL,
sizeof(GstAuParse),
0,
(GInstanceInitFunc) gst_auparse_init,
};
auparse_type = g_type_register_static (GST_TYPE_ELEMENT, "GstAuParse", &auparse_info, 0);
}
return auparse_type;
}
static void
gst_auparse_base_init (gpointer g_class)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_auparse_sink_template));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_auparse_src_template));
gst_element_class_set_details (element_class, &gst_auparse_details);
}
static void
gst_auparse_class_init (GstAuParseClass *klass)
{
GstElementClass *gstelement_class;
gstelement_class = (GstElementClass*) klass;
parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
}
static void
gst_auparse_init (GstAuParse *auparse)
{
auparse->sinkpad = gst_pad_new_from_template (
gst_static_pad_template_get (&gst_auparse_sink_template), "sink");
gst_element_add_pad (GST_ELEMENT (auparse), auparse->sinkpad);
gst_pad_set_chain_function (auparse->sinkpad, gst_auparse_chain);
auparse->srcpad = gst_pad_new_from_template (
gst_static_pad_template_get (&gst_auparse_src_template), "src");
gst_element_add_pad (GST_ELEMENT (auparse), auparse->srcpad);
gst_pad_use_explicit_caps (auparse->srcpad);
auparse->offset = 0;
auparse->size = 0;
auparse->encoding = 0;
auparse->frequency = 0;
auparse->channels = 0;
}
static void
gst_auparse_chain (GstPad *pad, GstData *_data)
{
GstBuffer *buf = GST_BUFFER (_data);
GstAuParse *auparse;
gchar *data;
glong size;
GstCaps *tempcaps;
gint law, depth;
gboolean sign;
g_return_if_fail (pad != NULL);
g_return_if_fail (GST_IS_PAD (pad));
g_return_if_fail (buf != NULL);
auparse = GST_AUPARSE (gst_pad_get_parent (pad));
GST_DEBUG ("gst_auparse_chain: got buffer in '%s'",
gst_element_get_name (GST_ELEMENT (auparse)));
data = GST_BUFFER_DATA (buf);
size = GST_BUFFER_SIZE (buf);
/* if we haven't seen any data yet... */
if (auparse->size == 0) {
GstBuffer *newbuf;
guint32 *head = (guint32 *)data;
/* normal format is big endian (au is a Sparc format) */
if (GUINT32_FROM_BE (*head) == 0x2e736e64) {
head++;
auparse->le = 0;
auparse->offset = GUINT32_FROM_BE (*head);
head++;
auparse->size = GUINT32_FROM_BE (*head);
head++;
auparse->encoding = GUINT32_FROM_BE (*head);
head++;
auparse->frequency = GUINT32_FROM_BE (*head);
head++;
auparse->channels = GUINT32_FROM_BE (*head);
head++;
/* and of course, someone had to invent a little endian
* version. Used by DEC systems. */
} else if (GUINT32_FROM_LE (*head) == 0x0064732E) {
auparse->le = 1;
head++;
auparse->le = 0;
auparse->offset = GUINT32_FROM_LE (*head);
head++;
auparse->size = GUINT32_FROM_LE (*head);
head++;
auparse->encoding = GUINT32_FROM_LE (*head);
head++;
auparse->frequency = GUINT32_FROM_LE (*head);
head++;
auparse->channels = GUINT32_FROM_LE (*head);
head++;
} else {
g_warning ("help, dunno what I'm looking at!\n");
gst_buffer_unref(buf);
return;
}
g_print ("offset %ld, size %ld, encoding %ld, frequency %ld, channels %ld\n",
auparse->offset,auparse->size,auparse->encoding,
auparse->frequency,auparse->channels);
GST_DEBUG ("offset %ld, size %ld, encoding %ld, frequency %ld, channels %ld",
auparse->offset,auparse->size,auparse->encoding,
auparse->frequency,auparse->channels);
switch (auparse->encoding) {
case 1:
law = 1;
depth = 8;
sign = FALSE;
break;
case 2:
law = 0;
depth = 8;
sign = FALSE;
break;
case 3:
law = 0;
depth = 16;
sign = TRUE;
break;
default:
g_warning ("help!, dont know how to deal with this format yet\n");
return;
}
if (law) {
tempcaps = gst_caps_new_simple ("audio/x-alaw",
"rate", G_TYPE_INT, auparse->frequency,
"channels", G_TYPE_INT, auparse->channels, NULL);
} else {
tempcaps = gst_caps_new_simple ("audio/x-raw-int",
"endianness", G_TYPE_INT, G_BIG_ENDIAN,
"rate", G_TYPE_INT, auparse->frequency,
"channels", G_TYPE_INT, auparse->channels,
"depth", G_TYPE_INT, depth,
"width", G_TYPE_INT, depth,
"signed", G_TYPE_BOOLEAN, sign, NULL);
}
if (!gst_pad_set_explicit_caps (auparse->srcpad, tempcaps)) {
gst_buffer_unref (buf);
return;
}
newbuf = gst_buffer_new ();
GST_BUFFER_DATA (newbuf) = (gpointer) malloc (size-(auparse->offset));
memcpy (GST_BUFFER_DATA (newbuf), data+24, size-(auparse->offset));
GST_BUFFER_SIZE (newbuf) = size-(auparse->offset);
gst_buffer_unref (buf);
gst_pad_push (auparse->srcpad, GST_DATA (newbuf));
return;
}
gst_pad_push (auparse->srcpad, GST_DATA (buf));
}
static gboolean
plugin_init (GstPlugin *plugin)
{
if (!gst_element_register (plugin, "auparse", GST_RANK_SECONDARY,
GST_TYPE_AUPARSE)) {
return FALSE;
}
return TRUE;
}
GST_PLUGIN_DEFINE (
GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"auparse",
"parses au streams",
plugin_init,
VERSION,
"GPL",
GST_PACKAGE,
GST_ORIGIN
)