gstreamer/gst/auparse/gstauparse.c

/* 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.
 */
/* Element-Checklist-Version: 5 */

/* 2001/04/03 - Updated parseau to use caps nego
 *              Zaheer Merali <zaheer@grid9.net
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdlib.h>
#include <string.h>

#include <gstauparse.h>
#include <gst/audio/audio.h>

/* elementfactory information */
static GstElementDetails gst_auparse_details = GST_ELEMENT_DETAILS (
  ".au parser",
  "Codec/Parser/Audio",
  "Parse an .au file into raw audio",
  "Erik Walthinsen <omega@cse.ogi.edu>"
);

static GstStaticPadTemplate gst_auparse_sink_template =
GST_STATIC_PAD_TEMPLATE (
  "sink",
  GST_PAD_SINK,
  GST_PAD_ALWAYS,
  GST_STATIC_CAPS ( "audio/x-au" )
);

static GstStaticPadTemplate gst_auparse_src_template =
GST_STATIC_PAD_TEMPLATE (
  "src",
  GST_PAD_SRC,
  GST_PAD_ALWAYS,
  GST_STATIC_CAPS (
    GST_AUDIO_INT_PAD_TEMPLATE_CAPS "; "
    "audio/x-alaw, "
      "rate = (int) [ 8000, 48000 ], "
      "channels = (int) [ 1, 2 ]"
  )
);

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

enum {
  ARG_0,
  /* FILL ME */
};

static void 	gst_auparse_base_init		(gpointer g_class);
static void 	gst_auparse_class_init		(GstAuParseClass *klass);
static void 	gst_auparse_init		(GstAuParse *auparse);

static void 	gst_auparse_chain		(GstPad *pad,GstData *_data);

static GstElementClass *parent_class = NULL;
/*static guint gst_auparse_signals[LAST_SIGNAL] = { 0 }; */

GType
gst_auparse_get_type (void) 
{
  static GType auparse_type = 0;

  if (!auparse_type) {
    static const GTypeInfo auparse_info = {
      sizeof(GstAuParseClass),
      gst_auparse_base_init,
      NULL,
      (GClassInitFunc) gst_auparse_class_init,
      NULL,
      NULL,
      sizeof(GstAuParse),
      0,
      (GInstanceInitFunc) gst_auparse_init,
    };
    auparse_type = g_type_register_static (GST_TYPE_ELEMENT, "GstAuParse", &auparse_info, 0);
  }
  return auparse_type;
}

static void
gst_auparse_base_init (gpointer g_class)
{
  GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);

  gst_element_class_add_pad_template (element_class,
      gst_static_pad_template_get (&gst_auparse_sink_template));
  gst_element_class_add_pad_template (element_class,
      gst_static_pad_template_get (&gst_auparse_src_template));
  gst_element_class_set_details (element_class, &gst_auparse_details);

}

static void
gst_auparse_class_init (GstAuParseClass *klass) 
{
  GstElementClass *gstelement_class;

  gstelement_class = (GstElementClass*) klass;

  parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
}

static void 
gst_auparse_init (GstAuParse *auparse) 
{
  auparse->sinkpad = gst_pad_new_from_template (
      gst_static_pad_template_get (&gst_auparse_sink_template), "sink");
  gst_element_add_pad (GST_ELEMENT (auparse), auparse->sinkpad);
  gst_pad_set_chain_function (auparse->sinkpad, gst_auparse_chain);

  auparse->srcpad = gst_pad_new_from_template (
      gst_static_pad_template_get (&gst_auparse_src_template), "src");
  gst_element_add_pad (GST_ELEMENT (auparse), auparse->srcpad);
  gst_pad_use_explicit_caps (auparse->srcpad);

  auparse->offset = 0;
  auparse->size = 0;
  auparse->encoding = 0;
  auparse->frequency = 0;
  auparse->channels = 0;
}

static void 
gst_auparse_chain (GstPad *pad, GstData *_data) 
{
  GstBuffer *buf = GST_BUFFER (_data);
  GstAuParse *auparse;
  gchar *data;
  glong size;
  GstCaps *tempcaps;
  gint law, depth;
  gboolean sign;

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

  auparse = GST_AUPARSE (gst_pad_get_parent (pad));
  
  GST_DEBUG ("gst_auparse_chain: got buffer in '%s'",
          gst_element_get_name (GST_ELEMENT (auparse)));

  data = GST_BUFFER_DATA (buf);
  size = GST_BUFFER_SIZE (buf);

  /* if we haven't seen any data yet... */
  if (auparse->size == 0) {
    GstBuffer *newbuf;
    guint32 *head = (guint32 *)data;

    /* normal format is big endian (au is a Sparc format) */
    if (GUINT32_FROM_BE (*head) == 0x2e736e64) {
      head++;
      auparse->le = 0;
      auparse->offset 		= GUINT32_FROM_BE (*head);
      head++;
      auparse->size 		= GUINT32_FROM_BE (*head);
      head++;
      auparse->encoding 	= GUINT32_FROM_BE (*head);
      head++;
      auparse->frequency 	= GUINT32_FROM_BE (*head);
      head++;
      auparse->channels 	= GUINT32_FROM_BE (*head);
      head++;

    /* and of course, someone had to invent a little endian
     * version.  Used by DEC systems. */
    } else if (GUINT32_FROM_LE (*head) == 0x0064732E) {
      auparse->le = 1;
      head++;
      auparse->le = 0;
      auparse->offset 		= GUINT32_FROM_LE (*head);
      head++;
      auparse->size 		= GUINT32_FROM_LE (*head);
      head++;
      auparse->encoding 	= GUINT32_FROM_LE (*head);
      head++;
      auparse->frequency 	= GUINT32_FROM_LE (*head);
      head++;
      auparse->channels 	= GUINT32_FROM_LE (*head);
      head++;

    } else {
      g_warning ("help, dunno what I'm looking at!\n");
      gst_buffer_unref(buf);
      return;
    }

    g_print ("offset %ld, size %ld, encoding %ld, frequency %ld, channels %ld\n",
             auparse->offset,auparse->size,auparse->encoding,
             auparse->frequency,auparse->channels);
    GST_DEBUG ("offset %ld, size %ld, encoding %ld, frequency %ld, channels %ld",
             auparse->offset,auparse->size,auparse->encoding,
             auparse->frequency,auparse->channels);
    
    switch (auparse->encoding) {
      case 1:
	law = 1;
	depth = 8;
	sign = FALSE;
	break;
      case 2:
	law = 0;
	depth = 8;
	sign = FALSE;
	break;
      case 3:
	law = 0;
	depth = 16;
	sign = TRUE;
	break;
      default:
	g_warning ("help!, dont know how to deal with this format yet\n");
	return;
    }

    if (law) {
      tempcaps = gst_caps_new_simple ("audio/x-alaw",
	  "rate", G_TYPE_INT, auparse->frequency,
	  "channels", G_TYPE_INT, auparse->channels, NULL);
    } else {
      tempcaps = gst_caps_new_simple ("audio/x-raw-int",
	  "endianness", G_TYPE_INT, G_BIG_ENDIAN,
	  "rate",       G_TYPE_INT, auparse->frequency,
	  "channels",   G_TYPE_INT, auparse->channels,
	  "depth",      G_TYPE_INT, depth,
	  "width",      G_TYPE_INT, depth,
	  "signed",     G_TYPE_BOOLEAN, sign, NULL);
    }

    if (!gst_pad_set_explicit_caps (auparse->srcpad, tempcaps)) {
      gst_buffer_unref (buf);
      return;
    }

    newbuf = gst_buffer_new ();
    GST_BUFFER_DATA (newbuf) = (gpointer) malloc (size-(auparse->offset));
    memcpy (GST_BUFFER_DATA (newbuf), data+24, size-(auparse->offset));
    GST_BUFFER_SIZE (newbuf) = size-(auparse->offset);

    gst_buffer_unref (buf);

    gst_pad_push (auparse->srcpad, GST_DATA (newbuf));
    return;
  }

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


static gboolean
plugin_init (GstPlugin *plugin)
{
  if (!gst_element_register (plugin, "auparse", GST_RANK_SECONDARY,
        GST_TYPE_AUPARSE)) {
    return FALSE;
  }

  return TRUE;
}

GST_PLUGIN_DEFINE (
  GST_VERSION_MAJOR,
  GST_VERSION_MINOR,
  "auparse",
  "parses au streams",
  plugin_init,
  VERSION,
  "GPL",
  GST_PACKAGE,
  GST_ORIGIN
)