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/* GStreamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
* Copyright (C) <2005> Edgard Lima <edgard.lima@indt.org.br>
*
* 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 <stdlib.h>
#include <string.h>
#include <gst/rtp/gstrtpbuffer.h>
#include "gstrtpg711enc.h"
/* elementfactory information */
static GstElementDetails gst_rtpg711enc_details = {
"RTP packet parser",
"Codec/Encoder/Network",
"Encodes PCMU/PCMA audio into a RTP packet",
"Edgard Lima <edgard.lima@indt.org.br>"
};
static GstStaticPadTemplate gst_rtpg711enc_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("audio/x-mulaw, channels=(int)1, rate=(int)8000 ;"
"audio/x-alaw, channels=(int)1, rate=(int)8000")
);
static GstStaticPadTemplate gst_rtpg711enc_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("application/x-rtp, "
"media = (string) \"audio\", "
"payload = (int) 0, "
"clock-rate = (int) 8000, "
"encoding-name = (string) \"PCMU\"; "
"application/x-rtp, "
"media = (string) \"audio\", "
"payload = (int) 8, "
"clock-rate = (int) 8000, " "encoding-name = (string) \"PCMA\"")
);
static gboolean gst_rtpg711enc_setcaps (GstBaseRTPPayload * payload,
GstCaps * caps);
static GstFlowReturn gst_rtpg711enc_handle_buffer (GstBaseRTPPayload * payload,
GstBuffer * buffer);
GST_BOILERPLATE (GstRtpG711Enc, gst_rtpg711enc, GstBaseRTPPayload,
GST_TYPE_BASE_RTP_PAYLOAD);
static void
gst_rtpg711enc_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_rtpg711enc_sink_template));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_rtpg711enc_src_template));
gst_element_class_set_details (element_class, &gst_rtpg711enc_details);
}
static void
gst_rtpg711enc_class_init (GstRtpG711EncClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
GstBaseRTPPayloadClass *gstbasertppayload_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
gstbasertppayload_class = (GstBaseRTPPayloadClass *) klass;
parent_class = g_type_class_ref (GST_TYPE_BASE_RTP_PAYLOAD);
gstbasertppayload_class->set_caps = gst_rtpg711enc_setcaps;
gstbasertppayload_class->handle_buffer = gst_rtpg711enc_handle_buffer;
}
static void
gst_rtpg711enc_init (GstRtpG711Enc * rtpg711enc, GstRtpG711EncClass * klass)
{
GST_BASE_RTP_PAYLOAD (rtpg711enc)->clock_rate = 8000;
}
static gboolean
gst_rtpg711enc_setcaps (GstBaseRTPPayload * payload, GstCaps * caps)
{
const char *stname;
GstStructure *structure;
structure = gst_caps_get_structure (caps, 0);
stname = gst_structure_get_name (structure);
if (0 == strcmp ("audio/x-mulaw", stname)) {
gst_basertppayload_set_options (payload, "audio", TRUE, "PCMU", 8000);
} else if (0 == strcmp ("audio/x-alaw", stname)) {
gst_basertppayload_set_options (payload, "audio", TRUE, "PCMA", 8000);
} else {
return FALSE;
}
gst_basertppayload_set_outcaps (payload, NULL);
return TRUE;
}
static GstFlowReturn
gst_rtpg711enc_handle_buffer (GstBaseRTPPayload * basepayload,
GstBuffer * buffer)
{
GstRtpG711Enc *rtpg711enc;
guint size, payload_len;
GstBuffer *outbuf;
guint8 *payload, *data;
GstClockTime timestamp;
GstFlowReturn ret;
rtpg711enc = GST_RTP_G711_ENC (basepayload);
size = GST_BUFFER_SIZE (buffer);
timestamp = GST_BUFFER_TIMESTAMP (buffer);
/* FIXME, only one G711 frame per RTP packet for now */
payload_len = size;
outbuf = gst_rtpbuffer_new_allocate (payload_len, 0, 0);
/* FIXME, assert for now */
g_assert (payload_len <= GST_BASE_RTP_PAYLOAD_MTU (rtpg711enc));
/* copy timestamp */
GST_BUFFER_TIMESTAMP (outbuf) = timestamp;
/* get payload */
payload = gst_rtpbuffer_get_payload (outbuf);
data = GST_BUFFER_DATA (buffer);
/* copy data in payload */
memcpy (&payload[0], data, size);
gst_buffer_unref (buffer);
ret = gst_basertppayload_push (basepayload, outbuf);
return ret;
}
gboolean
gst_rtpg711enc_plugin_init (GstPlugin * plugin)
{
return gst_element_register (plugin, "rtpg711enc",
GST_RANK_NONE, GST_TYPE_RTP_G711_ENC);
}
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