alaw.c 2.69 KB
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/* GStreamer PCM/A-Law conversions
 *
 * 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 2.1 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.
 */

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#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
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#include "alaw-encode.h"
#include "alaw-decode.h"

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static GstCaps *
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alaw_factory (void)
{
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  return gst_caps_new_simple ("audio/x-alaw",
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      "rate", GST_TYPE_INT_RANGE, 8000, 192000,
      "channels", GST_TYPE_INT_RANGE, 1, 2, NULL);
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}

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static GstCaps *
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linear_factory (void)
{
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  return gst_caps_new_simple ("audio/x-raw-int",
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      "width", G_TYPE_INT, 16,
      "depth", G_TYPE_INT, 16,
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      "endianness", G_TYPE_INT, G_BYTE_ORDER,
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      "signed", G_TYPE_BOOLEAN, TRUE,
      "rate", GST_TYPE_INT_RANGE, 8000, 192000,
      "channels", GST_TYPE_INT_RANGE, 1, 2, NULL);
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}

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GstPadTemplate *alawenc_src_template, *alawenc_sink_template;
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GstPadTemplate *alawdec_src_template, *alawdec_sink_template;

static gboolean
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plugin_init (GstPlugin * plugin)
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{
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  GstCaps *alaw_caps, *linear_caps;
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  alaw_caps = alaw_factory ();
  linear_caps = linear_factory ();
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  gst_caps_ref (alaw_caps);
  gst_caps_ref (linear_caps);
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  alawenc_src_template =
      gst_pad_template_new ("src", GST_PAD_SRC, GST_PAD_ALWAYS, alaw_caps);
  alawenc_sink_template =
      gst_pad_template_new ("sink", GST_PAD_SINK, GST_PAD_ALWAYS, linear_caps);
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  gst_caps_ref (alaw_caps);
  gst_caps_ref (linear_caps);
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  alawdec_src_template =
      gst_pad_template_new ("src", GST_PAD_SRC, GST_PAD_ALWAYS, linear_caps);
  alawdec_sink_template =
      gst_pad_template_new ("sink", GST_PAD_SINK, GST_PAD_ALWAYS, alaw_caps);
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  gst_caps_unref (alaw_caps);
  gst_caps_unref (linear_caps);

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  if (!gst_element_register (plugin, "alawenc",
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          GST_RANK_NONE, GST_TYPE_ALAW_ENC) ||
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      !gst_element_register (plugin, "alawdec",
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          GST_RANK_PRIMARY, GST_TYPE_ALAW_DEC))
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    return FALSE;
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  return TRUE;
}

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/* FIXME 0.11: merge alaw and mulaw into one plugin? */
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GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
    GST_VERSION_MINOR,
    "alaw",
    "ALaw audio conversion routines",
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    plugin_init, VERSION, GST_LICENSE, GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)