gstrtpL16depay.c 9.4 KB
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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
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 * Library General Public License for more
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 */

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#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
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#include <string.h>
#include "gstrtpL16parse.h"
#include "gstrtp-common.h"

/* elementfactory information */
static GstElementDetails gst_rtp_L16parse_details = {
  "RTP packet parser",
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  "Codec/Parser/Network",
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  "Extracts raw audio from RTP packets",
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  "Zeeshan Ali <zak147@yahoo.com>"
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};

/* RtpL16Parse signals and args */
enum
{
  /* FILL ME */
  LAST_SIGNAL
};

enum
{
  ARG_0,
  ARG_FREQUENCY,
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  ARG_PAYLOAD_TYPE
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};

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static GstStaticPadTemplate gst_rtp_L16parse_src_template =
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GST_STATIC_PAD_TEMPLATE ("src",
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    GST_PAD_SRC,
    GST_PAD_ALWAYS,
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    GST_STATIC_CAPS ("audio/x-raw-int, "
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        "endianness = (int) BYTE_ORDER, "
        "signed = (boolean) true, "
        "width = (int) 16, "
        "depth = (int) 16, "
        "rate = (int) [ 1000, 48000 ], " "channels = (int) [ 1, 2 ]")
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    );
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static GstStaticPadTemplate gst_rtp_L16parse_sink_template =
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GST_STATIC_PAD_TEMPLATE ("sink",
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    GST_PAD_SINK,
    GST_PAD_ALWAYS,
    GST_STATIC_CAPS ("application/x-rtp")
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    );
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static void gst_rtp_L16parse_class_init (GstRtpL16ParseClass * klass);
static void gst_rtp_L16parse_base_init (GstRtpL16ParseClass * klass);
static void gst_rtp_L16parse_init (GstRtpL16Parse * rtpL16parse);
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static void gst_rtp_L16parse_chain (GstPad * pad, GstData * _data);
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static void gst_rtp_L16parse_set_property (GObject * object, guint prop_id,
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    const GValue * value, GParamSpec * pspec);
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static void gst_rtp_L16parse_get_property (GObject * object, guint prop_id,
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    GValue * value, GParamSpec * pspec);
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static GstStateChangeReturn gst_rtp_L16parse_change_state (GstElement *
    element);
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static GstElementClass *parent_class = NULL;

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static GType
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gst_rtp_L16parse_get_type (void)
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{
  static GType rtpL16parse_type = 0;

  if (!rtpL16parse_type) {
    static const GTypeInfo rtpL16parse_info = {
      sizeof (GstRtpL16ParseClass),
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      (GBaseInitFunc) gst_rtp_L16parse_base_init,
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      NULL,
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      (GClassInitFunc) gst_rtp_L16parse_class_init,
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      NULL,
      NULL,
      sizeof (GstRtpL16Parse),
      0,
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      (GInstanceInitFunc) gst_rtp_L16parse_init,
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    };

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    rtpL16parse_type =
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        g_type_register_static (GST_TYPE_ELEMENT, "GstRtpL16Parse",
        &rtpL16parse_info, 0);
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  }
  return rtpL16parse_type;
}

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static void
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gst_rtp_L16parse_base_init (GstRtpL16ParseClass * klass)
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{
  GstElementClass *element_class = GST_ELEMENT_CLASS (klass);

  gst_element_class_add_pad_template (element_class,
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      gst_static_pad_template_get (&gst_rtp_L16parse_src_template));
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  gst_element_class_add_pad_template (element_class,
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      gst_static_pad_template_get (&gst_rtp_L16parse_sink_template));
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  gst_element_class_set_details (element_class, &gst_rtp_L16parse_details);
}

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static void
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gst_rtp_L16parse_class_init (GstRtpL16ParseClass * klass)
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{
  GObjectClass *gobject_class;
  GstElementClass *gstelement_class;

  gobject_class = (GObjectClass *) klass;
  gstelement_class = (GstElementClass *) klass;

  parent_class = g_type_class_ref (GST_TYPE_ELEMENT);

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  g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_PAYLOAD_TYPE,
      g_param_spec_int ("payload_type", "payload_type", "payload type",
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          G_MININT, G_MAXINT, PAYLOAD_L16_STEREO, G_PARAM_READABLE));
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  g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_FREQUENCY,
      g_param_spec_int ("frequency", "frequency", "frequency",
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          G_MININT, G_MAXINT, 44100, G_PARAM_READWRITE));
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  gobject_class->set_property = gst_rtp_L16parse_set_property;
  gobject_class->get_property = gst_rtp_L16parse_get_property;
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  gstelement_class->change_state = gst_rtp_L16parse_change_state;
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}

static void
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gst_rtp_L16parse_init (GstRtpL16Parse * rtpL16parse)
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{
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  rtpL16parse->srcpad =
      gst_pad_new_from_template (gst_static_pad_template_get
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      (&gst_rtp_L16parse_src_template), "src");
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  rtpL16parse->sinkpad =
      gst_pad_new_from_template (gst_static_pad_template_get
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      (&gst_rtp_L16parse_sink_template), "sink");
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  gst_element_add_pad (GST_ELEMENT (rtpL16parse), rtpL16parse->srcpad);
  gst_element_add_pad (GST_ELEMENT (rtpL16parse), rtpL16parse->sinkpad);
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  gst_pad_set_chain_function (rtpL16parse->sinkpad, gst_rtp_L16parse_chain);
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  rtpL16parse->frequency = 44100;
  rtpL16parse->channels = 2;

  rtpL16parse->payload_type = PAYLOAD_L16_STEREO;
}

void
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gst_rtp_L16parse_ntohs (GstBuffer * buf)
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{
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  gint16 *i, *len;
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  /* FIXME: is this code correct or even sane at all? */
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  i = (gint16 *) GST_BUFFER_DATA (buf);
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  len = i + GST_BUFFER_SIZE (buf) / sizeof (gint16 *);
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  for (; i < len; i++) {
    *i = g_ntohs (*i);
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  }
}

void
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gst_rtp_L16_caps_nego (GstRtpL16Parse * rtpL16parse)
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{
  GstCaps *caps;

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  caps =
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      gst_caps_copy (gst_static_caps_get (&gst_rtp_L16parse_src_template.
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          static_caps));
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  gst_caps_set_simple (caps,
      "rate", G_TYPE_INT, rtpL16parse->frequency,
      "channel", G_TYPE_INT, rtpL16parse->channels, NULL);
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  gst_pad_try_set_caps (rtpL16parse->srcpad, caps);
}

void
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gst_rtp_L16parse_payloadtype_change (GstRtpL16Parse * rtpL16parse,
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    rtp_payload_t pt)
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{
  rtpL16parse->payload_type = pt;
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  switch (pt) {
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    case PAYLOAD_L16_MONO:
      rtpL16parse->channels = 1;
      break;
    case PAYLOAD_L16_STEREO:
      rtpL16parse->channels = 2;
      break;
    default:
      g_warning ("unknown payload_t %d\n", pt);
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  }

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  gst_rtp_L16_caps_nego (rtpL16parse);
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}

static void
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gst_rtp_L16parse_chain (GstPad * pad, GstData * _data)
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{
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  GstBuffer *buf = GST_BUFFER (_data);
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  GstRtpL16Parse *rtpL16parse;
  GstBuffer *outbuf;
  Rtp_Packet packet;
  rtp_payload_t pt;

  g_return_if_fail (pad != NULL);
  g_return_if_fail (GST_IS_PAD (pad));
  g_return_if_fail (buf != NULL);

  rtpL16parse = GST_RTP_L16_PARSE (GST_OBJECT_PARENT (pad));

  g_return_if_fail (rtpL16parse != NULL);
  g_return_if_fail (GST_IS_RTP_L16_PARSE (rtpL16parse));

  if (GST_IS_EVENT (buf)) {
    GstEvent *event = GST_EVENT (buf);
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    gst_pad_event_default (pad, event);
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    return;
  }

  if (GST_PAD_CAPS (rtpL16parse->srcpad) == NULL) {
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    gst_rtp_L16_caps_nego (rtpL16parse);
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  }

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  packet =
      rtp_packet_new_copy_data (GST_BUFFER_DATA (buf), GST_BUFFER_SIZE (buf));
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  pt = rtp_packet_get_payload_type (packet);

  if (pt != rtpL16parse->payload_type) {
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    gst_rtp_L16parse_payloadtype_change (rtpL16parse, pt);
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  }

  outbuf = gst_buffer_new ();
  GST_BUFFER_SIZE (outbuf) = rtp_packet_get_payload_len (packet);
  GST_BUFFER_DATA (outbuf) = g_malloc (GST_BUFFER_SIZE (outbuf));
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  GST_BUFFER_TIMESTAMP (outbuf) =
      g_ntohl (rtp_packet_get_timestamp (packet)) * GST_SECOND;

  memcpy (GST_BUFFER_DATA (outbuf), rtp_packet_get_payload (packet),
      GST_BUFFER_SIZE (outbuf));
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  GST_DEBUG ("gst_rtp_L16parse_chain: pushing buffer of size %d",
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      GST_BUFFER_SIZE (outbuf));
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  /* FIXME: According to RFC 1890, this is required, right? */
#if G_BYTE_ORDER == G_LITTLE_ENDIAN
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  gst_rtp_L16parse_ntohs (outbuf);
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#endif

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  gst_pad_push (rtpL16parse->srcpad, GST_DATA (outbuf));
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  rtp_packet_free (packet);
  gst_buffer_unref (buf);
}

static void
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gst_rtp_L16parse_set_property (GObject * object, guint prop_id,
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    const GValue * value, GParamSpec * pspec)
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{
  GstRtpL16Parse *rtpL16parse;

  g_return_if_fail (GST_IS_RTP_L16_PARSE (object));
  rtpL16parse = GST_RTP_L16_PARSE (object);

  switch (prop_id) {
    case ARG_PAYLOAD_TYPE:
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      gst_rtp_L16parse_payloadtype_change (rtpL16parse,
          g_value_get_int (value));
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      break;
    case ARG_FREQUENCY:
      rtpL16parse->frequency = g_value_get_int (value);
      break;
    default:
      break;
  }
}

static void
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gst_rtp_L16parse_get_property (GObject * object, guint prop_id, GValue * value,
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    GParamSpec * pspec)
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{
  GstRtpL16Parse *rtpL16parse;

  g_return_if_fail (GST_IS_RTP_L16_PARSE (object));
  rtpL16parse = GST_RTP_L16_PARSE (object);

  switch (prop_id) {
    case ARG_PAYLOAD_TYPE:
      g_value_set_int (value, rtpL16parse->payload_type);
      break;
    case ARG_FREQUENCY:
      g_value_set_int (value, rtpL16parse->frequency);
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
  }
}

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static GstStateChangeReturn
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gst_rtp_L16parse_change_state (GstElement * element, GstStateChange transition)
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{
  GstRtpL16Parse *rtpL16parse;

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  g_return_val_if_fail (GST_IS_RTP_L16_PARSE (element),
      GST_STATE_CHANGE_FAILURE);
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  rtpL16parse = GST_RTP_L16_PARSE (element);

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  GST_DEBUG ("state pending %d\n", GST_STATE_PENDING (element));
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  switch (transition) {
    case GST_STATE_CHANGE_NULL_TO_READY:
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      break;
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    case GST_STATE_CHANGE_READY_TO_NULL:
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      break;
    default:
      break;
  }

  /* if we haven't failed already, give the parent class a chance to ;-) */
  if (GST_ELEMENT_CLASS (parent_class)->change_state)
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    return GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
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  return GST_STATE_CHANGE_SUCCESS;
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}

gboolean
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gst_rtp_L16parse_plugin_init (GstPlugin * plugin)
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{
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  return gst_element_register (plugin, "rtpL16parse",
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      GST_RANK_NONE, GST_TYPE_RTP_L16_PARSE);
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}