gstreamer/gst/rtp/gstrtpg711pay.c

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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 "gstrtpg711pay.h"
/* elementfactory information */
static GstElementDetails gst_rtp_g711_pay_details = {
"RTP packet parser",
"Codec/Payloader/Network",
"Payload-encodes PCMU/PCMA audio into a RTP packet",
"Edgard Lima <edgard.lima@indt.org.br>"
};
static GstStaticPadTemplate gst_rtp_g711_pay_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_rtp_g711_pay_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("application/x-rtp, "
"media = (string) \"audio\", "
"payload = (int) " GST_RTP_PAYLOAD_PCMU_STRING ", "
"clock-rate = (int) 8000, "
"encoding-name = (string) \"PCMU\"; "
"application/x-rtp, "
"media = (string) \"audio\", "
"payload = (int) " GST_RTP_PAYLOAD_PCMA_STRING ", "
"clock-rate = (int) 8000, " "encoding-name = (string) \"PCMA\"")
);
static gboolean gst_rtp_g711_pay_setcaps (GstBaseRTPPayload * payload,
GstCaps * caps);
static GstFlowReturn gst_rtp_g711_pay_handle_buffer (GstBaseRTPPayload *
payload, GstBuffer * buffer);
static void gst_rtp_g711_pay_finalize (GObject * object);
GST_BOILERPLATE (GstRtpG711Pay, gst_rtp_g711_pay, GstBaseRTPPayload,
GST_TYPE_BASE_RTP_PAYLOAD);
static void
gst_rtp_g711_pay_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_rtp_g711_pay_sink_template));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_rtp_g711_pay_src_template));
gst_element_class_set_details (element_class, &gst_rtp_g711_pay_details);
}
static void
gst_rtp_g711_pay_class_init (GstRtpG711PayClass * 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);
gobject_class->finalize = gst_rtp_g711_pay_finalize;
gstbasertppayload_class->set_caps = gst_rtp_g711_pay_setcaps;
gstbasertppayload_class->handle_buffer = gst_rtp_g711_pay_handle_buffer;
}
static void
gst_rtp_g711_pay_init (GstRtpG711Pay * rtpg711pay, GstRtpG711PayClass * klass)
{
rtpg711pay->adapter = gst_adapter_new ();
GST_BASE_RTP_PAYLOAD (rtpg711pay)->clock_rate = 8000;
}
static void
gst_rtp_g711_pay_finalize (GObject * object)
{
GstRtpG711Pay *rtpg711pay;
rtpg711pay = GST_RTP_G711_PAY (object);
g_object_unref (rtpg711pay->adapter);
rtpg711pay->adapter = NULL;
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static gboolean
gst_rtp_g711_pay_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)) {
payload->pt = GST_RTP_PAYLOAD_PCMU;
gst_basertppayload_set_options (payload, "audio", FALSE, "PCMU", 8000);
} else if (0 == strcmp ("audio/x-alaw", stname)) {
payload->pt = GST_RTP_PAYLOAD_PCMA;
gst_basertppayload_set_options (payload, "audio", FALSE, "PCMA", 8000);
} else {
return FALSE;
}
gst_basertppayload_set_outcaps (payload, NULL);
return TRUE;
}
static GstFlowReturn
gst_rtp_g711_pay_flush (GstRtpG711Pay * rtpg711pay)
{
guint avail;
GstBuffer *outbuf;
GstFlowReturn ret;
/* the data available in the adapter is either smaller
* than the MTU or bigger. In the case it is smaller, the complete
* adapter contents can be put in one packet. */
avail = gst_adapter_available (rtpg711pay->adapter);
ret = GST_FLOW_OK;
while (avail > 0) {
guint towrite;
guint8 *payload;
guint8 *data;
guint payload_len;
guint packet_len;
/* this will be the total lenght of the packet */
packet_len = gst_rtp_buffer_calc_packet_len (avail, 0, 0);
/* fill one MTU or all available bytes */
towrite = MIN (packet_len, GST_BASE_RTP_PAYLOAD_MTU (rtpg711pay));
/* this is the payload length */
payload_len = gst_rtp_buffer_calc_payload_len (towrite, 0, 0);
/* create buffer to hold the payload */
outbuf = gst_rtp_buffer_new_allocate (payload_len, 0, 0);
/* copy payload */
gst_rtp_buffer_set_payload_type (outbuf,
GST_BASE_RTP_PAYLOAD_PT (rtpg711pay));
payload = gst_rtp_buffer_get_payload (outbuf);
data = (guint8 *) gst_adapter_peek (rtpg711pay->adapter, payload_len);
memcpy (payload, data, payload_len);
gst_adapter_flush (rtpg711pay->adapter, payload_len);
avail -= payload_len;
GST_BUFFER_TIMESTAMP (outbuf) = rtpg711pay->first_ts;
ret = gst_basertppayload_push (GST_BASE_RTP_PAYLOAD (rtpg711pay), outbuf);
}
return ret;
}
static GstFlowReturn
gst_rtp_g711_pay_handle_buffer (GstBaseRTPPayload * basepayload,
GstBuffer * buffer)
{
GstRtpG711Pay *rtpg711pay;
guint size, packet_len, avail;
GstFlowReturn ret;
GstClockTime duration;
rtpg711pay = GST_RTP_G711_PAY (basepayload);
size = GST_BUFFER_SIZE (buffer);
duration = GST_BUFFER_TIMESTAMP (buffer);
avail = gst_adapter_available (rtpg711pay->adapter);
if (avail == 0) {
rtpg711pay->first_ts = GST_BUFFER_TIMESTAMP (buffer);
rtpg711pay->duration = 0;
}
/* get packet length of data and see if we exceeded MTU. */
packet_len = gst_rtp_buffer_calc_packet_len (avail + size, 0, 0);
/* if this buffer is going to overflow the packet, flush what we
* have. */
if (gst_basertppayload_is_filled (basepayload,
packet_len, rtpg711pay->duration + duration)) {
ret = gst_rtp_g711_pay_flush (rtpg711pay);
rtpg711pay->first_ts = GST_BUFFER_TIMESTAMP (buffer);
rtpg711pay->duration = 0;
} else {
ret = GST_FLOW_OK;
}
gst_adapter_push (rtpg711pay->adapter, buffer);
rtpg711pay->duration += duration;
return ret;
}
gboolean
gst_rtp_g711_pay_plugin_init (GstPlugin * plugin)
{
return gst_element_register (plugin, "rtpg711pay",
GST_RANK_NONE, GST_TYPE_RTP_G711_PAY);
}