gstreamer/ext/gsm/gstgsmdec.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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include "gstgsmdec.h"
/* elementfactory information */
GstElementDetails gst_gsmdec_details = {
"GSM audio decoder",
"Codec/Decoder/Audio",
"Decodes GSM encoded audio",
"Wim Taymans <wim.taymans@chello.be>",
};
/* GSMDec signals and args */
enum
{
/* FILL ME */
LAST_SIGNAL
};
enum
{
ARG_0,
/* FILL ME */
};
static void gst_gsmdec_base_init (gpointer g_class);
static void gst_gsmdec_class_init (GstGSMDec * klass);
static void gst_gsmdec_init (GstGSMDec * gsmdec);
static void gst_gsmdec_chain (GstPad * pad, GstData * _data);
static GstCaps *gst_gsmdec_getcaps (GstPad * pad);
static GstPadLinkReturn gst_gsmdec_link (GstPad * pad, const GstCaps * caps);
static GstElementClass *parent_class = NULL;
/*static guint gst_gsmdec_signals[LAST_SIGNAL] = { 0 }; */
GType
gst_gsmdec_get_type (void)
{
static GType gsmdec_type = 0;
if (!gsmdec_type) {
static const GTypeInfo gsmdec_info = {
sizeof (GstGSMDecClass),
gst_gsmdec_base_init,
NULL,
(GClassInitFunc) gst_gsmdec_class_init,
NULL,
NULL,
sizeof (GstGSMDec),
0,
(GInstanceInitFunc) gst_gsmdec_init,
};
gsmdec_type =
g_type_register_static (GST_TYPE_ELEMENT, "GstGSMDec", &gsmdec_info, 0);
}
return gsmdec_type;
}
static GstStaticPadTemplate gsmdec_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("audio/x-gsm, "
"rate = (int) [ 1000, 48000 ], " "channels = (int) 1")
);
static GstStaticPadTemplate gsmdec_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("audio/x-raw-int, "
"endianness = (int) BYTE_ORDER, "
"signed = (boolean) true, "
"width = (int) 16, "
"depth = (int) 16, "
"rate = (int) [ 1000, 48000 ], " "channels = (int) 1")
);
static void
gst_gsmdec_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 (&gsmdec_sink_template));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gsmdec_src_template));
gst_element_class_set_details (element_class, &gst_gsmdec_details);
}
static void
gst_gsmdec_class_init (GstGSMDec * klass)
{
GstElementClass *gstelement_class;
gstelement_class = (GstElementClass *) klass;
parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
}
static void
gst_gsmdec_init (GstGSMDec * gsmdec)
{
GST_DEBUG ("gst_gsmdec_init: initializing");
/* create the sink and src pads */
gsmdec->sinkpad =
gst_pad_new_from_template (gst_static_pad_template_get
(&gsmdec_sink_template), "sink");
gst_pad_set_chain_function (gsmdec->sinkpad, gst_gsmdec_chain);
gst_pad_set_getcaps_function (gsmdec->sinkpad, gst_gsmdec_getcaps);
gst_pad_set_link_function (gsmdec->sinkpad, gst_gsmdec_link);
gst_element_add_pad (GST_ELEMENT (gsmdec), gsmdec->sinkpad);
gsmdec->srcpad =
gst_pad_new_from_template (gst_static_pad_template_get
(&gsmdec_src_template), "src");
gst_pad_set_getcaps_function (gsmdec->srcpad, gst_gsmdec_getcaps);
gst_pad_set_link_function (gsmdec->srcpad, gst_gsmdec_link);
gst_element_add_pad (GST_ELEMENT (gsmdec), gsmdec->srcpad);
gsmdec->state = gsm_create ();
gsmdec->bufsize = 0;
}
static GstCaps *
gst_gsmdec_getcaps (GstPad * pad)
{
GstGSMDec *gsmdec = GST_GSMDEC (gst_pad_get_parent (pad));
const GValue *rate_value;
GstPad *otherpad;
GstCaps *othercaps, *basecaps;
if (pad == gsmdec->srcpad) {
otherpad = gsmdec->sinkpad;
basecaps = gst_caps_new_simple ("audio/x-raw-int",
"endianness", G_TYPE_INT, G_BYTE_ORDER,
"signed", G_TYPE_BOOLEAN, TRUE,
"width", G_TYPE_INT, 16, "depth", G_TYPE_INT, 16, NULL);
} else {
otherpad = gsmdec->srcpad;
basecaps = gst_caps_new_simple ("audio/x-gsm", NULL);
}
othercaps = gst_pad_get_allowed_caps (otherpad);
rate_value = gst_structure_get_value (gst_caps_get_structure (othercaps,
0), "rate");
gst_structure_set_value (gst_caps_get_structure (basecaps, 0), "rate",
rate_value);
return basecaps;
}
static GstPadLinkReturn
gst_gsmdec_link (GstPad * pad, const GstCaps * caps)
{
GstGSMDec *gsmdec = GST_GSMDEC (gst_pad_get_parent (pad));
GstPad *otherpad;
GstCaps *othercaps;
gint rate;
GstStructure *structure;
structure = gst_caps_get_structure (caps, 0);
gst_structure_get_int (structure, "rate", &rate);
if (pad == gsmdec->sinkpad) {
otherpad = gsmdec->srcpad;
othercaps = gst_caps_new_simple ("audio/x-raw-int",
"endianness", G_TYPE_INT, G_BYTE_ORDER,
"signed", G_TYPE_BOOLEAN, TRUE,
"width", G_TYPE_INT, 16, "depth", G_TYPE_INT, 16, NULL);
} else {
otherpad = gsmdec->sinkpad;
othercaps = gst_caps_new_simple ("audio/x-gsm", NULL);
}
gst_caps_set_simple (othercaps,
"rate", G_TYPE_INT, rate, "channels", G_TYPE_INT, 1, NULL);
return gst_pad_try_set_caps (otherpad, othercaps);
}
static void
gst_gsmdec_chain (GstPad * pad, GstData * _data)
{
GstBuffer *buf = GST_BUFFER (_data);
GstGSMDec *gsmdec;
gsm_byte *data;
guint size;
g_return_if_fail (pad != NULL);
g_return_if_fail (GST_IS_PAD (pad));
g_return_if_fail (buf != NULL);
/*g_return_if_fail(GST_IS_BUFFER(buf)); */
gsmdec = GST_GSMDEC (gst_pad_get_parent (pad));
data = (gsm_byte *) GST_BUFFER_DATA (buf);
size = GST_BUFFER_SIZE (buf);
if (gsmdec->bufsize && (gsmdec->bufsize + size >= 33)) {
GstBuffer *outbuf;
memcpy (gsmdec->buffer + gsmdec->bufsize, data,
(33 - gsmdec->bufsize) * sizeof (gsm_byte));
outbuf = gst_buffer_new ();
GST_BUFFER_DATA (outbuf) = g_malloc (160 * sizeof (gsm_signal));
GST_BUFFER_SIZE (outbuf) = 160 * sizeof (gsm_signal);
gsm_decode (gsmdec->state, gsmdec->buffer,
(gsm_signal *) GST_BUFFER_DATA (outbuf));
gst_pad_push (gsmdec->srcpad, GST_DATA (outbuf));
size -= (33 - gsmdec->bufsize);
data += (33 - gsmdec->bufsize);
gsmdec->bufsize = 0;
}
while (size >= 33) {
GstBuffer *outbuf;
outbuf = gst_buffer_new_and_alloc (160 * sizeof (gsm_signal));
gsm_decode (gsmdec->state, data, (gsm_signal *) GST_BUFFER_DATA (outbuf));
gst_pad_push (gsmdec->srcpad, GST_DATA (outbuf));
size -= 33;
data += 33;
}
if (size) {
memcpy (gsmdec->buffer + gsmdec->bufsize, data, size * sizeof (gsm_byte));
gsmdec->bufsize += size;
}
gst_buffer_unref (buf);
}