path: root/gst/passthrough/gstpassthrough.c

/* -*- c-basic-offset: 2 -*-
 * GStreamer
 * Copyright (C) 1999-2001 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 <gst/gst.h>
#include <gst/audio/audio.h>
#include "gstpassthrough.h"

#define PASSTHRU_BUF_SIZE 4096
#define PASSTHRU_NUM_BUFS 4

enum
{
  /* FILL ME */
  LAST_SIGNAL
};

/* static guint gst_filter_signals[LAST_SIGNAL] = { 0 }; */

enum
{
  ARG_0,
  ARG_SILENT
};

static GstStaticPadTemplate passthrough_sink_template =
    GST_STATIC_PAD_TEMPLATE ("sink",
    GST_PAD_SINK,
    GST_PAD_ALWAYS,
    GST_STATIC_CAPS (GST_AUDIO_INT_PAD_TEMPLATE_CAPS "; "
        GST_AUDIO_FLOAT_STANDARD_PAD_TEMPLATE_CAPS)
    );

static GstStaticPadTemplate passthrough_src_template =
    GST_STATIC_PAD_TEMPLATE ("src",
    GST_PAD_SRC,
    GST_PAD_ALWAYS,
    GST_STATIC_CAPS (GST_AUDIO_INT_PAD_TEMPLATE_CAPS "; "
        GST_AUDIO_FLOAT_STANDARD_PAD_TEMPLATE_CAPS)
    );

static void passthrough_class_init (GstPassthroughClass * klass);
static void passthrough_base_init (GstPassthroughClass * klass);
static void passthrough_init (GstPassthrough * filter);

static void passthrough_set_property (GObject * object, guint prop_id,
    const GValue * value, GParamSpec * pspec);
static void passthrough_get_property (GObject * object, guint prop_id,
    GValue * value, GParamSpec * pspec);

static GstPadLinkReturn passthrough_connect_sink (GstPad * pad,
    const GstCaps * caps);

static void passthrough_chain (GstPad * pad, GstData * _data);
static void inline passthrough_fast_float_chain (gfloat * data,
    guint numsamples);
static void inline passthrough_fast_16bit_chain (gint16 * data,
    guint numsamples);
static void inline passthrough_fast_8bit_chain (gint8 * data, guint numsamples);

static GstElementClass *parent_class = NULL;

static GstPadLinkReturn
passthrough_connect_sink (GstPad * pad, const GstCaps * caps)
{
  const gchar *mimetype;
  GstPassthrough *filter;
  GstStructure *structure;

  g_return_val_if_fail (pad != NULL, GST_PAD_LINK_DELAYED);
  g_return_val_if_fail (caps != NULL, GST_PAD_LINK_DELAYED);

  filter = GST_PASSTHROUGH (gst_pad_get_parent (pad));
  g_return_val_if_fail (filter != NULL, GST_PAD_LINK_REFUSED);
  g_return_val_if_fail (GST_IS_PASSTHROUGH (filter), GST_PAD_LINK_REFUSED);

  structure = gst_caps_get_structure (caps, 0);

  mimetype = gst_structure_get_name (structure);
  gst_structure_get_int (structure, "rate", &filter->rate);
  gst_structure_get_int (structure, "channels", &filter->channels);
  gst_structure_get_int (structure, "width", &filter->width);
  gst_structure_get_int (structure, "endianness", &filter->endianness);

  if (strcmp (mimetype, "audio/x-raw-int") == 0) {
    filter->format = GST_PASSTHROUGH_FORMAT_INT;

    gst_structure_get_int (structure, "depth", &filter->depth);
    gst_structure_get_boolean (structure, "signed", &filter->is_signed);

    if (!filter->silent) {
      g_print ("Passthrough : channels %d, rate %d\n", filter->channels,
          filter->rate);
      g_print
          ("Passthrough : format int, bit width %d, endianness %d, signed %s\n",
          filter->width, filter->endianness, filter->is_signed ? "yes" : "no");
    }
  } else if (strcmp (mimetype, "audio/x-raw-float") == 0) {
    filter->format = GST_PASSTHROUGH_FORMAT_FLOAT;

    if (!filter->silent) {
      g_print ("Passthrough : channels %d, rate %d\n", filter->channels,
          filter->rate);
      g_print ("Passthrough : format float, width %d\n", filter->width);
    }
  }

  return gst_pad_try_set_caps (filter->srcpad, caps);
}

GType
gst_passthrough_get_type (void)
{
  static GType passthrough_type = 0;

  if (!passthrough_type) {
    static const GTypeInfo passthrough_info = {
      sizeof (GstPassthroughClass),
      (GBaseInitFunc) passthrough_base_init,
      NULL,
      (GClassInitFunc) passthrough_class_init,
      NULL,
      NULL,
      sizeof (GstPassthrough),
      0,
      (GInstanceInitFunc) passthrough_init,
    };

    passthrough_type =
        g_type_register_static (GST_TYPE_ELEMENT, "GstPassthrough",
        &passthrough_info, 0);
  }
  return passthrough_type;
}

static void
passthrough_base_init (GstPassthroughClass * klass)
{
  GstElementClass *element_class = GST_ELEMENT_CLASS (klass);

  gst_element_class_add_pad_template (element_class,
      gst_static_pad_template_get (&passthrough_src_template));
  gst_element_class_add_pad_template (element_class,
      gst_static_pad_template_get (&passthrough_sink_template));
  gst_element_class_set_details_simple (element_class, "Passthrough",
      "Filter/Effect/Audio",
      "Transparent filter for audio/raw (boilerplate for effects)",
      "Thomas <thomas@apestaart.org>, " "Andy Wingo <apwingo@eos.ncsu.edu>");
}

static void
passthrough_class_init (GstPassthroughClass * klass)
{
  GObjectClass *gobject_class;
  GstElementClass *gstelement_class;

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

  parent_class = g_type_class_peek_parent (klass);

  g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_SILENT,
      g_param_spec_boolean ("silent", "silent", "silent", TRUE,
          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));

  gobject_class->set_property = passthrough_set_property;
  gobject_class->get_property = passthrough_get_property;
}

static void
passthrough_init (GstPassthrough * filter)
{
  filter->srcpad =
      gst_pad_new_from_static_template (&passthrough_src_template, "src");
  gst_element_add_pad (GST_ELEMENT (filter), filter->srcpad);
  filter->sinkpad =
      gst_pad_new_from_static_template (&passthrough_sink_template, "sink");
  gst_element_add_pad (GST_ELEMENT (filter), filter->sinkpad);

  gst_pad_set_link_function (filter->sinkpad, passthrough_connect_sink);
  gst_pad_set_chain_function (filter->sinkpad, passthrough_chain);

  filter->silent = FALSE;
}

static void
passthrough_chain (GstPad * pad, GstData * _data)
{
  GstBuffer *buf = GST_BUFFER (_data);
  GstPassthrough *filter;
  gint16 *int_data;
  gfloat *float_data;

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

  filter = GST_PASSTHROUGH (gst_pad_get_parent (pad));
  g_return_if_fail (filter != NULL);
  g_return_if_fail (GST_IS_PASSTHROUGH (filter));

  switch (filter->format) {
    case GST_PASSTHROUGH_FORMAT_INT:
      int_data = (gint16 *) GST_BUFFER_DATA (buf);

      switch (filter->width) {
        case 16:
          passthrough_fast_16bit_chain (int_data, GST_BUFFER_SIZE (buf) / 2);
          break;
        case 8:
          passthrough_fast_8bit_chain ((gint8 *) int_data,
              GST_BUFFER_SIZE (buf));
          break;
      }

      break;
    case GST_PASSTHROUGH_FORMAT_FLOAT:
      float_data = (gfloat *) GST_BUFFER_DATA (buf);

      passthrough_fast_float_chain (float_data,
          GST_BUFFER_SIZE (buf) / sizeof (gfloat));

      break;
  }

  gst_pad_push (filter->srcpad, GST_DATA (buf));
}

static void inline
passthrough_fast_float_chain (gfloat * data, guint num_samples)
#include "filter.func"
     static void inline
         passthrough_fast_16bit_chain (gint16 * data, guint num_samples)
#include "filter.func"
     static void inline
         passthrough_fast_8bit_chain (gint8 * data, guint num_samples)
#include "filter.func"
     static void
         passthrough_set_property (GObject * object, guint prop_id,
    const GValue * value, GParamSpec * pspec)
{
  GstPassthrough *filter;

  g_return_if_fail (GST_IS_PASSTHROUGH (object));
  filter = GST_PASSTHROUGH (object);

  switch (prop_id) {
    case ARG_SILENT:
      filter->silent = g_value_get_boolean (value);
      break;
    default:
      break;
  }
}

static void
passthrough_get_property (GObject * object, guint prop_id, GValue * value,
    GParamSpec * pspec)
{
  GstPassthrough *filter;

  g_return_if_fail (GST_IS_PASSTHROUGH (object));
  filter = GST_PASSTHROUGH (object);

  switch (prop_id) {
    case ARG_SILENT:
      g_value_set_boolean (value, filter->silent);
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
  }
}

static gboolean
plugin_init (GstPlugin * plugin)
{
  return gst_element_register (plugin, "passthrough",
      GST_RANK_NONE, GST_TYPE_PASSTHROUGH);
}

GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
    GST_VERSION_MINOR,
    "passthrough",
    "Transparent filter for audio/raw (boilerplate for effects)",
    plugin_init, VERSION, "LGPL", GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)