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/*
* Farsight
* GStreamer GSM encoder
* Copyright (C) 2005 Philippe Khalaf <burger@speedy.org>
*
* 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"
GST_DEBUG_CATEGORY (gsmdec_debug);
#define GST_CAT_DEFAULT (gsmdec_debug)
/* elementfactory information */
GstElementDetails gst_gsmdec_details = {
"GSM audio decoder",
"Codec/Decoder/Audio",
"Decodes GSM encoded audio",
"Philippe Khalaf <burger@speedy.org>",
};
/* GSMDec signals and args */
enum
{
/* FILL ME */
LAST_SIGNAL
};
enum
{
/* FILL ME */
ARG_0
};
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 GstFlowReturn gst_gsmdec_chain (GstPad * pad, GstBuffer * buf);
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) 8000, " "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) 8000, " "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);
GST_DEBUG_CATEGORY_INIT (gsmdec_debug, "gsmdec", 0, "GSM Decoder");
}
static void
gst_gsmdec_init (GstGSMDec * gsmdec)
{
/* 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_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_element_add_pad (GST_ELEMENT (gsmdec), gsmdec->srcpad);
gsmdec->state = gsm_create ();
// turn on WAN49 handling
gint use_wav49 = 0;
gsm_option (gsmdec->state, GSM_OPT_WAV49, &use_wav49);
gsmdec->next_of = 0;
gsmdec->next_ts = 0;
}
static GstFlowReturn
gst_gsmdec_chain (GstPad * pad, GstBuffer * buf)
{
GstGSMDec *gsmdec;
gsm_byte *data;
GstFlowReturn ret = GST_FLOW_OK;
gsmdec = GST_GSMDEC (gst_pad_get_parent (pad));
// do we have enough bytes to read a header
if (GST_BUFFER_SIZE (buf) >= 33) {
GstBuffer *outbuf;
outbuf = gst_buffer_new_and_alloc (160 * sizeof (gsm_signal));
// TODO take new segment in consideration, if not given restart
// timestamps at 0
if (GST_BUFFER_TIMESTAMP (buf) == GST_CLOCK_TIME_NONE) {
/* If we are not given any timestamp */
GST_BUFFER_TIMESTAMP (outbuf) = gsmdec->next_ts;
gsmdec->next_ts += 20 * GST_MSECOND;
}
else {
/* But if you insist on giving us a timestamp, you are welcome. */
GST_BUFFER_TIMESTAMP (outbuf) = GST_BUFFER_TIMESTAMP (buf);
}
GST_BUFFER_DURATION (outbuf) = 20 * GST_MSECOND;
GST_BUFFER_OFFSET (outbuf) = gsmdec->next_of;
GST_BUFFER_OFFSET_END (outbuf) = gsmdec->next_of + 160 - 1;
gst_buffer_set_caps (outbuf, gst_pad_get_caps (gsmdec->srcpad));
gsmdec->next_of += 160;
data = (gsm_byte *) GST_BUFFER_DATA (buf);
gsm_decode (gsmdec->state, data, (gsm_signal *) GST_BUFFER_DATA (outbuf));
GST_DEBUG ("Pushing buffer of size %d ts %" GST_TIME_FORMAT,
GST_BUFFER_SIZE (outbuf),
GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (outbuf)));
//gst_util_dump_mem (GST_BUFFER_DATA(outbuf), GST_BUFFER_SIZE (outbuf));
ret = gst_pad_push (gsmdec->srcpad, outbuf);
}
gst_buffer_unref (buf);
gst_object_unref (gsmdec);
return ret;
}
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