gstreamer/gst/rtp/gstrtpL16enc.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 <stdlib.h>
#include "gstrtpL16enc.h"
/* elementfactory information */
static GstElementDetails gst_rtpL16enc_details = {
"RTP RAW Audio Encoder",
"Codec/Encoder/Network",
"Encodes Raw Audio into a RTP packet",
"Zeeshan Ali <zak147@yahoo.com>"
};
/* RtpL16Enc signals and args */
enum
{
/* FILL ME */
LAST_SIGNAL
};
enum
{
/* FILL ME */
ARG_0
};
static GstStaticPadTemplate gst_rtpL16enc_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
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, 2 ]")
);
static GstStaticPadTemplate gst_rtpL16enc_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("application/x-rtp")
);
static void gst_rtpL16enc_class_init (GstRtpL16EncClass * klass);
static void gst_rtpL16enc_base_init (GstRtpL16EncClass * klass);
static void gst_rtpL16enc_init (GstRtpL16Enc * rtpL16enc);
static void gst_rtpL16enc_chain (GstPad * pad, GstData * _data);
static void gst_rtpL16enc_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_rtpL16enc_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static GstPadLinkReturn gst_rtpL16enc_sinkconnect (GstPad * pad,
const GstCaps * caps);
static GstStateChangeReturn gst_rtpL16enc_change_state (GstElement * element,
GstStateChange transition);
static GstElementClass *parent_class = NULL;
static GType
gst_rtpL16enc_get_type (void)
{
static GType rtpL16enc_type = 0;
if (!rtpL16enc_type) {
static const GTypeInfo rtpL16enc_info = {
sizeof (GstRtpL16EncClass),
(GBaseInitFunc) gst_rtpL16enc_base_init,
NULL,
(GClassInitFunc) gst_rtpL16enc_class_init,
NULL,
NULL,
sizeof (GstRtpL16Enc),
0,
(GInstanceInitFunc) gst_rtpL16enc_init,
};
rtpL16enc_type =
g_type_register_static (GST_TYPE_ELEMENT, "GstRtpL16Enc",
&rtpL16enc_info, 0);
}
return rtpL16enc_type;
}
static void
gst_rtpL16enc_base_init (GstRtpL16EncClass * klass)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_rtpL16enc_sink_template));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_rtpL16enc_src_template));
gst_element_class_set_details (element_class, &gst_rtpL16enc_details);
}
static void
gst_rtpL16enc_class_init (GstRtpL16EncClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
gobject_class->set_property = gst_rtpL16enc_set_property;
gobject_class->get_property = gst_rtpL16enc_get_property;
gstelement_class->change_state = gst_rtpL16enc_change_state;
}
static void
gst_rtpL16enc_init (GstRtpL16Enc * rtpL16enc)
{
rtpL16enc->sinkpad =
gst_pad_new_from_template (gst_static_pad_template_get
(&gst_rtpL16enc_sink_template), "sink");
rtpL16enc->srcpad =
gst_pad_new_from_template (gst_static_pad_template_get
(&gst_rtpL16enc_src_template), "src");
gst_element_add_pad (GST_ELEMENT (rtpL16enc), rtpL16enc->sinkpad);
gst_element_add_pad (GST_ELEMENT (rtpL16enc), rtpL16enc->srcpad);
gst_pad_set_chain_function (rtpL16enc->sinkpad, gst_rtpL16enc_chain);
gst_pad_set_link_function (rtpL16enc->sinkpad, gst_rtpL16enc_sinkconnect);
rtpL16enc->frequency = 44100;
rtpL16enc->channels = 2;
rtpL16enc->next_time = 0;
rtpL16enc->time_interval = 0;
rtpL16enc->seq = 0;
rtpL16enc->ssrc = random ();
}
static GstPadLinkReturn
gst_rtpL16enc_sinkconnect (GstPad * pad, const GstCaps * caps)
{
GstRtpL16Enc *rtpL16enc;
GstStructure *structure;
gboolean ret;
rtpL16enc = GST_RTP_L16_ENC (gst_pad_get_parent (pad));
structure = gst_caps_get_structure (caps, 0);
ret = gst_structure_get_int (structure, "rate", &rtpL16enc->frequency);
ret &= gst_structure_get_int (structure, "channels", &rtpL16enc->channels);
if (!ret)
return GST_PAD_LINK_REFUSED;
/* Pre-calculate what we can */
rtpL16enc->time_interval =
GST_SECOND / (2 * rtpL16enc->channels * rtpL16enc->frequency);
return GST_PAD_LINK_OK;
}
void
gst_rtpL16enc_htons (GstBuffer * buf)
{
gint16 *i, *len;
/* FIXME: is this code correct or even sane at all? */
i = (gint16 *) GST_BUFFER_DATA (buf);
len = i + GST_BUFFER_SIZE (buf) / sizeof (gint16 *);
for (; i < len; i++) {
*i = g_htons (*i);
}
}
static void
gst_rtpL16enc_chain (GstPad * pad, GstData * _data)
{
GstBuffer *buf = GST_BUFFER (_data);
GstRtpL16Enc *rtpL16enc;
GstBuffer *outbuf;
Rtp_Packet packet;
g_return_if_fail (pad != NULL);
g_return_if_fail (GST_IS_PAD (pad));
g_return_if_fail (buf != NULL);
rtpL16enc = GST_RTP_L16_ENC (GST_OBJECT_PARENT (pad));
g_return_if_fail (rtpL16enc != NULL);
g_return_if_fail (GST_IS_RTP_L16_ENC (rtpL16enc));
if (GST_IS_EVENT (buf)) {
GstEvent *event = GST_EVENT (buf);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_DISCONTINUOUS:
GST_DEBUG ("discont");
rtpL16enc->next_time = 0;
gst_pad_event_default (pad, event);
return;
default:
gst_pad_event_default (pad, event);
return;
}
}
/* We only need the header */
packet = rtp_packet_new_allocate (0, 0, 0);
rtp_packet_set_csrc_count (packet, 0);
rtp_packet_set_extension (packet, 0);
rtp_packet_set_padding (packet, 0);
rtp_packet_set_version (packet, RTP_VERSION);
rtp_packet_set_marker (packet, 0);
rtp_packet_set_ssrc (packet, g_htonl (rtpL16enc->ssrc));
rtp_packet_set_seq (packet, g_htons (rtpL16enc->seq));
rtp_packet_set_timestamp (packet,
g_htonl ((guint32) rtpL16enc->next_time / GST_SECOND));
if (rtpL16enc->channels == 1) {
rtp_packet_set_payload_type (packet, (guint8) PAYLOAD_L16_MONO);
}
else {
rtp_packet_set_payload_type (packet, (guint8) PAYLOAD_L16_STEREO);
}
/* FIXME: According to RFC 1890, this is required, right? */
#if G_BYTE_ORDER == G_LITTLE_ENDIAN
gst_rtpL16enc_htons (buf);
#endif
outbuf = gst_buffer_new ();
GST_BUFFER_SIZE (outbuf) =
rtp_packet_get_packet_len (packet) + GST_BUFFER_SIZE (buf);
GST_BUFFER_DATA (outbuf) = g_malloc (GST_BUFFER_SIZE (outbuf));
GST_BUFFER_TIMESTAMP (outbuf) = rtpL16enc->next_time;
memcpy (GST_BUFFER_DATA (outbuf), packet->data,
rtp_packet_get_packet_len (packet));
memcpy (GST_BUFFER_DATA (outbuf) + rtp_packet_get_packet_len (packet),
GST_BUFFER_DATA (buf), GST_BUFFER_SIZE (buf));
GST_DEBUG ("gst_rtpL16enc_chain: pushing buffer of size %d",
GST_BUFFER_SIZE (outbuf));
gst_pad_push (rtpL16enc->srcpad, GST_DATA (outbuf));
++rtpL16enc->seq;
rtpL16enc->next_time += rtpL16enc->time_interval * GST_BUFFER_SIZE (buf);
rtp_packet_free (packet);
gst_buffer_unref (buf);
}
static void
gst_rtpL16enc_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstRtpL16Enc *rtpL16enc;
g_return_if_fail (GST_IS_RTP_L16_ENC (object));
rtpL16enc = GST_RTP_L16_ENC (object);
switch (prop_id) {
default:
break;
}
}
static void
gst_rtpL16enc_get_property (GObject * object, guint prop_id, GValue * value,
GParamSpec * pspec)
{
GstRtpL16Enc *rtpL16enc;
g_return_if_fail (GST_IS_RTP_L16_ENC (object));
rtpL16enc = GST_RTP_L16_ENC (object);
switch (prop_id) {
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static GstStateChangeReturn
gst_rtpL16enc_change_state (GstElement * element, GstStateChange transition)
{
GstRtpL16Enc *rtpL16enc;
g_return_val_if_fail (GST_IS_RTP_L16_ENC (element), GST_STATE_CHANGE_FAILURE);
rtpL16enc = GST_RTP_L16_ENC (element);
GST_DEBUG ("state pending %d\n", GST_STATE_PENDING (element));
/* if going down into NULL state, close the file if it's open */
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
break;
case GST_STATE_CHANGE_READY_TO_NULL:
break;
default:
break;
}
/* if we haven't failed already, give the parent class a chance to ;-) */
if (GST_ELEMENT_CLASS (parent_class)->change_state)
return GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
return GST_STATE_CHANGE_SUCCESS;
}
gboolean
gst_rtpL16enc_plugin_init (GstPlugin * plugin)
{
return gst_element_register (plugin, "rtpL16enc",
GST_RANK_NONE, GST_TYPE_RTP_L16_ENC);
}