gstreamer/ext/esd/esdmon.c

/* GStreamer
 * Copyright (C) <2001,2002> Richard Boulton <richard-gst@tartarus.org>
 *
 * Based on example.c:
 * 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.
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "esdmon.h"
#include <esd.h>
#include <unistd.h>


/* elementfactory information */
static GstElementDetails esdmon_details = {
  "Esound audio monitor",
  "Source/Audio",
  "Monitors audio from an esound server",
  "Richard Boulton <richard-gst@tartarus.org>",
};

/* Signals and args */
enum {
  /* FILL ME */
  LAST_SIGNAL
};

enum {
  ARG_0,
  ARG_DEPTH,
  ARG_BYTESPERREAD,
  ARG_CUROFFSET,
  ARG_CHANNELS,
  ARG_RATE,
  ARG_HOST,
};

static GstStaticPadTemplate src_factory = 
GST_STATIC_PAD_TEMPLATE (
  "src",
  GST_PAD_SRC,
  GST_PAD_ALWAYS,
  GST_STATIC_CAPS (
    "audio/x-raw-int, "
      "endianness = (int) " G_STRINGIFY (G_BYTE_ORDER) ", "
      "signed = (boolean) TRUE, "
      "width = (int) 16, "
      "depth = (int) 16, "
      "rate = [ 8000, 96000 ], "
      "channels = [ 1, 2 ]; "
    "audio/x-raw-int, "
      "signed = (boolean) FALSE, "
      "width = (int) 8, "
      "depth = (int) 8, "
      "rate = [ 8000, 96000 ], "
      "channels = [ 1, 2 ]"
  )
);

static void                     gst_esdmon_base_init    (gpointer g_class);
static void			gst_esdmon_class_init	(gpointer g_class, gpointer class_data);
static void			gst_esdmon_init		(GTypeInstance *instance, gpointer g_class);

static gboolean			gst_esdmon_open_audio	(GstEsdmon *src);
static void			gst_esdmon_close_audio	(GstEsdmon *src);
static GstElementStateReturn	gst_esdmon_change_state	(GstElement *element);
static gboolean			gst_esdmon_sync_parms	(GstEsdmon *esdmon);

static GstData *		gst_esdmon_get		(GstPad *pad);

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

#define GST_TYPE_ESDMON_DEPTHS (gst_esdmon_depths_get_type())
static GType
gst_esdmon_depths_get_type (void)
{
  static GType esdmon_depths_type = 0;
  static GEnumValue esdmon_depths[] = {
    {8, "8", "8 Bits"},
    {16, "16", "16 Bits"},
    {0, NULL, NULL},
  };
  if (!esdmon_depths_type) {
    esdmon_depths_type = g_enum_register_static("GstEsdmonDepths", esdmon_depths);
  }
  return esdmon_depths_type;
}

#define GST_TYPE_ESDMON_CHANNELS (gst_esdmon_channels_get_type())
static GType
gst_esdmon_channels_get_type (void)
{
  static GType esdmon_channels_type = 0;
  static GEnumValue esdmon_channels[] = {
    {1, "1", "Mono"},
    {2, "2", "Stereo"},
    {0, NULL, NULL},
  };
  if (!esdmon_channels_type) {
    esdmon_channels_type = g_enum_register_static("GstEsdmonChannels", esdmon_channels);
  }
  return esdmon_channels_type;
}


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

GType
gst_esdmon_get_type (void)
{
  static GType esdmon_type = 0;

  if (!esdmon_type) {
    static const GTypeInfo esdmon_info = {
      sizeof(GstEsdmonClass),
      gst_esdmon_base_init,
      NULL,
      gst_esdmon_class_init,
      NULL,
      NULL,
      sizeof(GstEsdmon),
      0,
      gst_esdmon_init,
    };
    esdmon_type = g_type_register_static(GST_TYPE_ELEMENT, "GstEsdmon", &esdmon_info, 0);
  }
  return esdmon_type;
}

static void
gst_esdmon_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 (&src_factory));
  gst_element_class_set_details (element_class, &esdmon_details);
}

static void
gst_esdmon_class_init (gpointer g_class, gpointer class_data)
{
  GObjectClass *gobject_class = G_OBJECT_CLASS (g_class);
  GstElementClass *gstelement_class = GST_ELEMENT_CLASS (g_class);

  parent_class = g_type_class_peek_parent (g_class);

  g_object_class_install_property(gobject_class, ARG_BYTESPERREAD,
    g_param_spec_ulong("bytes_per_read","bytes_per_read","bytes_per_read",
                       0,G_MAXULONG,0,G_PARAM_READWRITE)); /* CHECKME */
  g_object_class_install_property(gobject_class, ARG_CUROFFSET,
    g_param_spec_ulong("curoffset","curoffset","curoffset",
                       0,G_MAXULONG,0,G_PARAM_READABLE)); /* CHECKME */
  g_object_class_install_property(gobject_class, ARG_DEPTH,
    g_param_spec_enum("depth","depth","depth",
                      GST_TYPE_ESDMON_DEPTHS,16,G_PARAM_READWRITE)); /* CHECKME! */
  g_object_class_install_property(gobject_class, ARG_CHANNELS,
    g_param_spec_enum("channels","channels","channels",
                      GST_TYPE_ESDMON_CHANNELS,2,G_PARAM_READWRITE)); /* CHECKME! */
  g_object_class_install_property(gobject_class, ARG_RATE,
    g_param_spec_int("frequency","frequency","frequency",
                     G_MININT,G_MAXINT,0,G_PARAM_READWRITE)); /* CHECKME */
  g_object_class_install_property(gobject_class, ARG_HOST,
    g_param_spec_string("host","host","host",
                        NULL, G_PARAM_READWRITE)); /* CHECKME */

  gobject_class->set_property = gst_esdmon_set_property;
  gobject_class->get_property = gst_esdmon_get_property;

  gstelement_class->change_state = gst_esdmon_change_state;
}

static void
gst_esdmon_init(GTypeInstance *instance, gpointer g_class)
{
  GstEsdmon *esdmon = GST_ESDMON (instance);

  esdmon->srcpad = gst_pad_new_from_template (
      gst_element_class_get_pad_template (GST_ELEMENT_GET_CLASS (esdmon), "src"),
      "src");
  gst_pad_set_get_function(esdmon->srcpad, gst_esdmon_get);
  gst_pad_use_explicit_caps (esdmon->srcpad);
  gst_element_add_pad(GST_ELEMENT(esdmon), esdmon->srcpad);

  esdmon->fd = -1;
  /* FIXME: get default from somewhere better than just putting them inline. */
  esdmon->depth = 16;
  esdmon->channels = 2;
  esdmon->frequency = 44100;
  esdmon->host = NULL;
  esdmon->bytes_per_read = 4096;
  esdmon->curoffset = 0;
  esdmon->basetime = 0;
  esdmon->samples_since_basetime = 0;
}

static gboolean
gst_esdmon_sync_parms (GstEsdmon *esdmon)
{
  g_return_val_if_fail (esdmon != NULL, FALSE);
  g_return_val_if_fail (GST_IS_ESDMON (esdmon), FALSE);

  if (esdmon->fd == -1) return TRUE;

  /* Need to set fd to use new parameters: only way to do this is to reopen. */
  gst_esdmon_close_audio (esdmon);
  return gst_esdmon_open_audio (esdmon);
}

static GstData *
gst_esdmon_get (GstPad *pad)
{
  GstEsdmon *esdmon;
  GstBuffer *buf;
  glong readbytes;
  glong readsamples;

  g_return_val_if_fail (pad != NULL, NULL);
  esdmon = GST_ESDMON(gst_pad_get_parent (pad));

  GST_DEBUG ("attempting to read something from esdmon");

  buf = gst_buffer_new ();
  g_return_val_if_fail (buf, NULL);

  GST_BUFFER_DATA (buf) = (gpointer)g_malloc (esdmon->bytes_per_read);

  readbytes = read (esdmon->fd,
		    GST_BUFFER_DATA (buf),
                    esdmon->bytes_per_read);

  if (readbytes == 0) {
      gst_element_set_eos (GST_ELEMENT (esdmon));
      return NULL;
  }
  if (!GST_PAD_CAPS (pad)) {
    gint sign = (esdmon->depth == 8 ? FALSE : TRUE);
    /* set caps on src pad */
    if (gst_pad_set_explicit_caps (esdmon->srcpad,
	gst_caps_new_simple ("audio/x-raw-int",
	  "endianness", G_TYPE_INT,	G_BYTE_ORDER,
          "signed",     G_TYPE_BOOLEAN, sign,
          "width",      G_TYPE_INT,	esdmon->depth,
          "depth",      G_TYPE_INT,	esdmon->depth,
          "rate",       G_TYPE_INT,	esdmon->frequency,
          "channels",   G_TYPE_INT,	esdmon->channels
        )) <= 0)
    {
      gst_element_error (GST_ELEMENT (esdmon), "could not set caps");
      return NULL;
    }
  }

  GST_BUFFER_SIZE (buf) = readbytes;
  GST_BUFFER_OFFSET (buf) = esdmon->curoffset;
  GST_BUFFER_TIMESTAMP (buf) = esdmon->basetime +
	  esdmon->samples_since_basetime * GST_SECOND / esdmon->frequency;

  esdmon->curoffset += readbytes;
  readsamples = readbytes / esdmon->channels;
  if (esdmon->depth == 16) readsamples /= 2;
  esdmon->samples_since_basetime += readsamples;

  GST_DEBUG ("pushed buffer from esdmon of %ld bytes, timestamp %" G_GINT64_FORMAT, readbytes, GST_BUFFER_TIMESTAMP (buf));
  return GST_DATA (buf);
}

static void
gst_esdmon_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec)
{
  GstEsdmon *esdmon;

  /* it's not null if we got it, but it might not be ours */
  g_return_if_fail(GST_IS_ESDMON(object));
  esdmon = GST_ESDMON(object);

  switch (prop_id) {
    case ARG_BYTESPERREAD:
      esdmon->bytes_per_read = g_value_get_ulong (value);
      /* No need to sync params - will just happen on next read. */
      break;
    case ARG_DEPTH:
      esdmon->depth = g_value_get_enum (value);
      gst_esdmon_sync_parms (esdmon);
      break;
    case ARG_CHANNELS:
      esdmon->channels = g_value_get_enum (value);
      gst_esdmon_sync_parms (esdmon);
      break;
    case ARG_RATE:
      /* Preserve the timestamps */
      esdmon->basetime = esdmon->samples_since_basetime * GST_SECOND / esdmon->frequency;
      esdmon->samples_since_basetime = 0;

      /* Set the new frequency */
      esdmon->frequency = g_value_get_int (value);
      gst_esdmon_sync_parms (esdmon);
      break;
    case ARG_HOST:
      if (esdmon->host != NULL) g_free(esdmon->host);
      if (g_value_get_string (value) == NULL)
	  esdmon->host = NULL;
      else
	  esdmon->host = g_strdup (g_value_get_string (value));
      break;
    default:
      break;
  }
}

static void
gst_esdmon_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
{
  GstEsdmon *esdmon;

  /* it's not null if we got it, but it might not be ours */
  g_return_if_fail(GST_IS_ESDMON(object));
  esdmon = GST_ESDMON(object);

  switch (prop_id) {
    case ARG_BYTESPERREAD:
      g_value_set_ulong (value, esdmon->bytes_per_read);
      break;
    case ARG_CUROFFSET:
      g_value_set_ulong (value, esdmon->curoffset);
      break;
    case ARG_DEPTH:
      g_value_set_enum (value, esdmon->depth);
      break;
    case ARG_CHANNELS:
      g_value_set_enum (value, esdmon->channels);
      break;
    case ARG_RATE:
      g_value_set_int (value, esdmon->frequency);
      break;
    case ARG_HOST:
      g_value_set_string (value, esdmon->host);
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
  }
}

gboolean
gst_esdmon_factory_init (GstPlugin *plugin)
{
  if (!gst_element_register (plugin, "esdmon", GST_RANK_NONE, GST_TYPE_ESDMON))
    return FALSE;
  
  return TRUE;
}

static gboolean
gst_esdmon_open_audio (GstEsdmon *src)
{
  /* Name used by esound for this connection. */
  const char * connname = "GStreamer";

  /* Bitmap describing audio format. */
  esd_format_t esdformat = ESD_STREAM | ESD_PLAY;

  g_return_val_if_fail (src->fd == -1, FALSE);

  if (src->depth == 16) esdformat |= ESD_BITS16;
  else if (src->depth == 8) esdformat |= ESD_BITS8;
  else {
    GST_DEBUG ("esdmon: invalid bit depth (%d)", src->depth);
    return FALSE;
  }

  if (src->channels == 2) esdformat |= ESD_STEREO;
  else if (src->channels == 1) esdformat |= ESD_MONO;
  else {
    GST_DEBUG ("esdmon: invalid number of channels (%d)", src->channels);
    return FALSE;
  }

  GST_DEBUG ("esdmon: attempting to open connection to esound server");
  src->fd = esd_monitor_stream(esdformat, src->frequency, src->host, connname);
  if ( src->fd < 0 ) {
    GST_DEBUG ("esdmon: can't open connection to esound server");
    return FALSE;
  }

  GST_FLAG_SET (src, GST_ESDMON_OPEN);

  return TRUE;
}

static void
gst_esdmon_close_audio (GstEsdmon *src)
{
  if (src->fd < 0) return;

  close(src->fd);
  src->fd = -1;

  GST_FLAG_UNSET (src, GST_ESDMON_OPEN);

  GST_DEBUG ("esdmon: closed sound device");
}

static GstElementStateReturn
gst_esdmon_change_state (GstElement *element)
{
  g_return_val_if_fail (GST_IS_ESDMON (element), FALSE);

  /* if going down into NULL state, close the fd if it's open */
  if (GST_STATE_PENDING (element) == GST_STATE_NULL) {
    if (GST_FLAG_IS_SET (element, GST_ESDMON_OPEN))
      gst_esdmon_close_audio (GST_ESDMON (element));
    /* otherwise (READY or higher) we need to open the fd */
  } else {
    if (!GST_FLAG_IS_SET (element, GST_ESDMON_OPEN)) {
      if (!gst_esdmon_open_audio (GST_ESDMON (element)))
	return GST_STATE_FAILURE;
    }
  }

  if (GST_ELEMENT_CLASS (parent_class)->change_state)
    return GST_ELEMENT_CLASS (parent_class)->change_state (element);
  return GST_STATE_SUCCESS;
}