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/* GStreamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
* Copyright (C) <2005> Edgard Lima <edgard.lima@indt.org.br>
* Copyright (C) <2005> Zeeshan Ali <zeenix@gmail.com>
*
* 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
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <string.h>
#include <gst/rtp/gstrtpbuffer.h>
#include "gstrtpg711dec.h"
/* elementfactory information */
static GstElementDetails gst_rtp_g711dec_details = {
"RTP packet parser",
"Codec/Parser/Network",
"Extracts PCMU/PCMA audio from RTP packets",
"Edgard Lima <edgard.lima@indt.org.br>, Zeeshan Ali <zeenix@gmail.com>"
};
/* RtpG711Dec signals and args */
enum
{
/* FILL ME */
LAST_SIGNAL
};
enum
{
ARG_0
};
static GstStaticPadTemplate gst_rtpg711dec_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("application/x-rtp, "
"media = (string) \"audio\", "
"payload = (int) [ 0, 255 ], "
"clock-rate = (int) 8000, "
"encoding-name = (string) \"PCMU\"; "
"application/x-rtp, "
"media = (string) \"audio\", "
"payload = (int) [ 0, 255 ], "
"clock-rate = (int) 8000, " "encoding-name = (string) \"PCMA\"")
);
static GstStaticPadTemplate gst_rtpg711dec_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("audio/x-mulaw, "
"channels = (int) 1; " "audio/x-alaw, " "channels = (int) 1")
);
static GstBuffer *gst_rtpg711dec_process (GstBaseRTPDepayload * depayload,
GstBuffer * buf);
static gboolean gst_rtpg711dec_setcaps (GstBaseRTPDepayload * depayload,
GstCaps * caps);
GST_BOILERPLATE (GstRtpG711Dec, gst_rtpg711dec, GstBaseRTPDepayload,
GST_TYPE_BASE_RTP_DEPAYLOAD);
static void
gst_rtpg711dec_base_init (gpointer klass)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_rtpg711dec_src_template));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_rtpg711dec_sink_template));
gst_element_class_set_details (element_class, &gst_rtp_g711dec_details);
}
static void
gst_rtpg711dec_class_init (GstRtpG711DecClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
GstBaseRTPDepayloadClass *gstbasertpdepayload_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
gstbasertpdepayload_class = (GstBaseRTPDepayloadClass *) klass;
parent_class = g_type_class_ref (GST_TYPE_BASE_RTP_DEPAYLOAD);
gstbasertpdepayload_class->process = gst_rtpg711dec_process;
gstbasertpdepayload_class->set_caps = gst_rtpg711dec_setcaps;
}
static void
gst_rtpg711dec_init (GstRtpG711Dec * rtpg711dec, GstRtpG711DecClass * klass)
{
GstBaseRTPDepayload *depayload;
depayload = GST_BASE_RTP_DEPAYLOAD (rtpg711dec);
depayload->clock_rate = 8000;
gst_pad_use_fixed_caps (GST_BASE_RTP_DEPAYLOAD_SRCPAD (depayload));
}
static gboolean
gst_rtpg711dec_setcaps (GstBaseRTPDepayload * depayload, GstCaps * caps)
{
GstCaps *srccaps;
const gchar *enc_name;
GstStructure *structure;
gboolean ret;
structure = gst_caps_get_structure (caps, 0);
enc_name = gst_structure_get_string (structure, "encoding-name");
if (NULL == enc_name) {
return FALSE;
}
if (0 == strcmp ("PCMU", enc_name)) {
srccaps = gst_caps_new_simple ("audio/x-mulaw",
"channels", G_TYPE_INT, 1, "rate", G_TYPE_INT, 8000, NULL);
} else if (0 == strcmp ("PCMA", enc_name)) {
srccaps = gst_caps_new_simple ("audio/x-alaw",
"channels", G_TYPE_INT, 1, "rate", G_TYPE_INT, 8000, NULL);
} else {
return FALSE;
}
ret = gst_pad_set_caps (GST_BASE_RTP_DEPAYLOAD_SRCPAD (depayload), srccaps);
gst_caps_unref (srccaps);
return ret;
}
static GstBuffer *
gst_rtpg711dec_process (GstBaseRTPDepayload * depayload, GstBuffer * buf)
{
GstCaps *srccaps;
GstBuffer *outbuf = NULL;
gint payload_len;
guint8 *payload;
GST_DEBUG ("process : got %d bytes, mark %d ts %u seqn %d",
GST_BUFFER_SIZE (buf),
gst_rtpbuffer_get_marker (buf),
gst_rtpbuffer_get_timestamp (buf), gst_rtpbuffer_get_seq (buf));
srccaps = GST_PAD_CAPS (GST_BASE_RTP_DEPAYLOAD_SRCPAD (depayload));
if (!srccaps) {
/* Set the default caps */
srccaps = gst_caps_new_simple ("audio/x-mulaw",
"channels", G_TYPE_INT, 1, "rate", G_TYPE_INT, 8000, NULL);
gst_pad_set_caps (GST_BASE_RTP_DEPAYLOAD_SRCPAD (depayload), srccaps);
gst_caps_unref (srccaps);
}
payload_len = gst_rtpbuffer_get_payload_len (buf);
payload = gst_rtpbuffer_get_payload (buf);
outbuf = gst_buffer_new_and_alloc (payload_len);
memcpy (GST_BUFFER_DATA (outbuf), payload, payload_len);
return outbuf;
}
gboolean
gst_rtpg711dec_plugin_init (GstPlugin * plugin)
{
return gst_element_register (plugin, "rtpg711dec",
GST_RANK_NONE, GST_TYPE_RTP_G711_DEC);
}
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