gstreamer/ext/esd/esdsink.c

/* GStreamer
 * Copyright (C) <2001> 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 "esdsink.h"
#include <esd.h>
#include <unistd.h>
#include <errno.h>

GST_DEBUG_CATEGORY_EXTERN (esd_debug);
#define GST_CAT_DEFAULT esd_debug

/* elementfactory information */
static GstElementDetails esdsink_details = {
  "Esound audio sink",
  "Sink/Audio",
  "Plays audio to an esound server",
  "Richard Boulton <richard-gst@tartarus.org>",
};

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

enum
{
  ARG_0,
  ARG_MUTE,
  ARG_HOST,
  ARG_SYNC,
  ARG_FALLBACK
};

static GstStaticPadTemplate sink_factory = GST_STATIC_PAD_TEMPLATE ("sink",
    GST_PAD_SINK,
    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 = 44100, " "channels = 2")
    );

static void gst_esdsink_base_init (gpointer g_class);
static void gst_esdsink_class_init (gpointer g_class, gpointer class_data);
static void gst_esdsink_init (GTypeInstance * instance, gpointer g_class);
static void gst_esdsink_dispose (GObject * object);

static gboolean gst_esdsink_open_audio (GstEsdsink * sink);
static void gst_esdsink_close_audio (GstEsdsink * sink);
static GstElementStateReturn gst_esdsink_change_state (GstElement * element);

static GstClockTime gst_esdsink_get_time (GstClock * clock, gpointer data);
static GstClock *gst_esdsink_get_clock (GstElement * element);
static void gst_esdsink_set_clock (GstElement * element, GstClock * clock);
static void gst_esdsink_chain (GstPad * pad, GstData * _data);

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

static GstElementClass *parent_class = NULL;

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

GType
gst_esdsink_get_type (void)
{
  static GType esdsink_type = 0;

  if (!esdsink_type) {
    static const GTypeInfo esdsink_info = {
      sizeof (GstEsdsinkClass),
      gst_esdsink_base_init,
      NULL,
      gst_esdsink_class_init,
      NULL,
      NULL,
      sizeof (GstEsdsink),
      0,
      gst_esdsink_init,
    };

    esdsink_type =
        g_type_register_static (GST_TYPE_ELEMENT, "GstEsdsink", &esdsink_info,
        0);
  }
  return esdsink_type;
}

static void
gst_esdsink_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 (&sink_factory));
  gst_element_class_set_details (element_class, &esdsink_details);
}

static void
gst_esdsink_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_MUTE, g_param_spec_boolean ("mute", "mute", "mute", TRUE, 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 */
  g_object_class_install_property (gobject_class, ARG_SYNC,
      g_param_spec_boolean ("sync", "sync", "Synchronize output to clock",
          TRUE, G_PARAM_READWRITE));
#if 0
  /* This option is disabled because it is dumb in GStreamer's architecture. */
  g_object_class_install_property (gobject_class, ARG_FALLBACK,
      g_param_spec_boolean ("fallback", "fallback",
          "Fall back to using OSS if Esound daemon is not present", FALSE,
          G_PARAM_READWRITE));
#endif

  gobject_class->set_property = gst_esdsink_set_property;
  gobject_class->get_property = gst_esdsink_get_property;
  gobject_class->dispose = gst_esdsink_dispose;

  gstelement_class->change_state = gst_esdsink_change_state;
  gstelement_class->set_clock = gst_esdsink_set_clock;
  gstelement_class->get_clock = gst_esdsink_get_clock;
}

static void
gst_esdsink_init (GTypeInstance * instance, gpointer g_class)
{
  GstEsdsink *esdsink = GST_ESDSINK (instance);

  esdsink->sinkpad =
      gst_pad_new_from_template (gst_element_class_get_pad_template
      (GST_ELEMENT_GET_CLASS (instance), "sink"), "sink");
  gst_element_add_pad (GST_ELEMENT (esdsink), esdsink->sinkpad);
  gst_pad_set_chain_function (esdsink->sinkpad,
      GST_DEBUG_FUNCPTR (gst_esdsink_chain));

  GST_FLAG_SET (esdsink, GST_ELEMENT_EVENT_AWARE);

  esdsink->mute = FALSE;
  esdsink->fd = -1;
  /* FIXME: get default from somewhere better than just putting them inline. */
  /*esdsink->negotiated = FALSE; */
  /* we have static caps on our template, so it always is negotiated */
  esdsink->negotiated = TRUE;
  esdsink->format = 16;
  esdsink->depth = 16;
  esdsink->channels = 2;
  esdsink->frequency = 44100;
  esdsink->bytes_per_sample = esdsink->channels * (esdsink->depth / 8);
  esdsink->host = getenv ("ESPEAKER");
  esdsink->provided_clock =
      gst_audio_clock_new ("esdclock", gst_esdsink_get_time, esdsink);
  gst_object_set_parent (GST_OBJECT (esdsink->provided_clock),
      GST_OBJECT (esdsink));
  esdsink->sync = TRUE;
  esdsink->fallback = FALSE;
  esdsink->link_open = FALSE;
}

static void
gst_esdsink_dispose (GObject * object)
{
  GstEsdsink *esdsink = GST_ESDSINK (object);

  g_free (esdsink->host);
}

#ifdef unused
static GstPadLinkReturn
gst_esdsink_link (GstPad * pad, const GstCaps * caps)
{
  GstEsdsink *esdsink;
  GstStructure *structure;

  esdsink = GST_ESDSINK (gst_pad_get_parent (pad));

  structure = gst_caps_get_structure (caps, 0);
  gst_structure_get_int (structure, "depth", &esdsink->depth);
  gst_structure_get_int (structure, "channels", &esdsink->channels);
  gst_structure_get_int (structure, "rate", &esdsink->frequency);

  esdsink->bytes_per_sample = esdsink->channels * (esdsink->depth / 8);

  if (esdsink->link_open) {
    gst_esdsink_close_audio (esdsink);
    if (gst_esdsink_open_audio (esdsink)) {
      esdsink->negotiated = TRUE;
      esdsink->link_open = TRUE;
      return GST_PAD_LINK_OK;
    }
  }
  /* FIXME: is it supposed to be correct to have closed audio when caps nego 
     failed? */

  GST_DEBUG ("esd link function could not negotiate, returning delayed");
  return GST_PAD_LINK_REFUSED;
}
#endif

static GstClockTime
gst_esdsink_get_time (GstClock * clock, gpointer data)
{
  GstEsdsink *esdsink = GST_ESDSINK (data);
  GstClockTime res;

  res = (esdsink->handled * GST_SECOND) / esdsink->frequency;
  //- GST_SECOND * 2;

  return res;
}

static GstClock *
gst_esdsink_get_clock (GstElement * element)
{
  GstEsdsink *esdsink;

  esdsink = GST_ESDSINK (element);

  return GST_CLOCK (esdsink->provided_clock);
}

static void
gst_esdsink_set_clock (GstElement * element, GstClock * clock)
{
  GstEsdsink *esdsink;

  esdsink = GST_ESDSINK (element);

  esdsink->clock = clock;
}

static void
gst_esdsink_chain (GstPad * pad, GstData * _data)
{
  GstBuffer *buf = GST_BUFFER (_data);
  GstEsdsink *esdsink;

  esdsink = GST_ESDSINK (gst_pad_get_parent (pad));

  if (!esdsink->negotiated) {
    GST_ELEMENT_ERROR (esdsink, CORE, NEGOTIATION, (NULL),
        ("element wasn't negotiated before chain function"));
    goto done;
  }

  if (GST_IS_EVENT (buf)) {
    GstEvent *event = GST_EVENT (buf);

    switch (GST_EVENT_TYPE (event)) {
      case GST_EVENT_EOS:
        gst_audio_clock_set_active (GST_AUDIO_CLOCK (esdsink->provided_clock),
            FALSE);
        gst_pad_event_default (pad, event);
        return;
      default:
        gst_pad_event_default (pad, event);
        return;
    }
    gst_event_unref (event);
    return;
  }

  if (GST_BUFFER_DATA (buf) != NULL) {
    if (!esdsink->mute && esdsink->fd >= 0) {
      guchar *data = GST_BUFFER_DATA (buf);
      gint size = GST_BUFFER_SIZE (buf);
      gint to_write = 0;

      to_write = size;

      GST_LOG ("fd=%d data=%p size=%d",
          esdsink->fd, GST_BUFFER_DATA (buf), GST_BUFFER_SIZE (buf));
      while (to_write > 0) {
        int done;

        done = write (esdsink->fd, data, to_write);

        if (done < 0) {
          if (errno == EINTR) {
            goto done;
          }
          /* connection closed? */
          GST_ELEMENT_ERROR (esdsink, RESOURCE, WRITE, (NULL),
              ("communication with ESD failed"));
          return;
        }

        to_write -= done;
        data += done;
        esdsink->handled += done / esdsink->bytes_per_sample;
      }

    }
  }

  gst_audio_clock_update_time ((GstAudioClock *) esdsink->provided_clock,
      gst_esdsink_get_time (esdsink->provided_clock, esdsink));

done:
  gst_buffer_unref (buf);
}

static void
gst_esdsink_set_property (GObject * object, guint prop_id, const GValue * value,
    GParamSpec * pspec)
{
  GstEsdsink *esdsink;

  /* it's not null if we got it, but it might not be ours */
  g_return_if_fail (GST_IS_ESDSINK (object));
  esdsink = GST_ESDSINK (object);

  switch (prop_id) {
    case ARG_MUTE:
      esdsink->mute = g_value_get_boolean (value);
      break;
    case ARG_HOST:
      g_free (esdsink->host);
      if (g_value_get_string (value) == NULL)
        esdsink->host = NULL;
      else
        esdsink->host = g_strdup (g_value_get_string (value));
      break;
    case ARG_SYNC:
      esdsink->sync = g_value_get_boolean (value);
      break;
    case ARG_FALLBACK:
      esdsink->fallback = g_value_get_boolean (value);
      break;
    default:
      break;
  }
}

static void
gst_esdsink_get_property (GObject * object, guint prop_id, GValue * value,
    GParamSpec * pspec)
{
  GstEsdsink *esdsink;

  esdsink = GST_ESDSINK (object);

  switch (prop_id) {
    case ARG_MUTE:
      g_value_set_boolean (value, esdsink->mute);
      break;
    case ARG_HOST:
      g_value_set_string (value, esdsink->host);
      break;
    case ARG_SYNC:
      g_value_set_boolean (value, esdsink->sync);
      break;
    case ARG_FALLBACK:
      g_value_set_boolean (value, esdsink->fallback);
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
  }
}

gboolean
gst_esdsink_factory_init (GstPlugin * plugin)
{
  if (!gst_element_register (plugin, "esdsink", GST_RANK_NONE,
          GST_TYPE_ESDSINK))
    return FALSE;

  return TRUE;
}

static gboolean
gst_esdsink_open_audio (GstEsdsink * sink)
{
  /* 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 (sink->fd == -1, FALSE);

  if (sink->depth == 16)
    esdformat |= ESD_BITS16;
  else if (sink->depth == 8)
    esdformat |= ESD_BITS8;
  else {
    GST_ELEMENT_ERROR (sink, STREAM, FORMAT, (NULL),
        ("invalid bit depth (%d)", sink->depth));
    return FALSE;
  }

  if (sink->channels == 2)
    esdformat |= ESD_STEREO;
  else if (sink->channels == 1)
    esdformat |= ESD_MONO;
  else {
    GST_ELEMENT_ERROR (sink, STREAM, FORMAT, (NULL),
        ("invalid number of channels (%d)", sink->channels));
    return FALSE;
  }

  GST_INFO ("attempting to open connection to esound server");
  if (sink->fallback) {
    sink->fd =
        esd_play_stream_fallback (esdformat, sink->frequency, sink->host,
        connname);
  } else {
    sink->fd =
        esd_play_stream (esdformat, sink->frequency, sink->host, connname);
  }
  if (sink->fd < 0) {
    GST_ELEMENT_ERROR (sink, RESOURCE, OPEN_WRITE, (NULL),
        ("can't open connection to esound server"));
    return FALSE;
  }
  GST_INFO ("successfully opened connection to esound server");

  return TRUE;
}

static void
gst_esdsink_close_audio (GstEsdsink * sink)
{
  if (sink->fd < 0)
    return;

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

  GST_INFO ("esdsink: closed sound device");
}

static GstElementStateReturn
gst_esdsink_change_state (GstElement * element)
{
  GstEsdsink *esdsink;

  esdsink = GST_ESDSINK (element);

  switch (GST_STATE_TRANSITION (element)) {
    case GST_STATE_NULL_TO_READY:
      break;
    case GST_STATE_READY_TO_PAUSED:
      /* Open and close the link to test it's available */
      if (!esdsink->link_open) {
        if (!gst_esdsink_open_audio (GST_ESDSINK (element))) {
          return GST_STATE_FAILURE;
        }
        gst_esdsink_close_audio (GST_ESDSINK (element));
      }
      break;
    case GST_STATE_PAUSED_TO_PLAYING:
      if (!esdsink->link_open) {
        if (!gst_esdsink_open_audio (GST_ESDSINK (element))) {
          return GST_STATE_FAILURE;
        }
        esdsink->link_open = TRUE;
      }
      gst_audio_clock_set_active (GST_AUDIO_CLOCK (esdsink->provided_clock),
          TRUE);
      break;
    case GST_STATE_PLAYING_TO_PAUSED:
      gst_audio_clock_set_active (GST_AUDIO_CLOCK (esdsink->provided_clock),
          FALSE);
      if (esdsink->link_open) {
        gst_esdsink_close_audio (GST_ESDSINK (element));
        esdsink->link_open = FALSE;
      }
      esdsink->resync = TRUE;
      break;
    case GST_STATE_PAUSED_TO_READY:
      /* Make doubly sure we don't leave our esd connection open
       * or we'll block the other users
       */
      if (esdsink->link_open) {
        gst_esdsink_close_audio (GST_ESDSINK (element));
        esdsink->link_open = FALSE;
      }
      break;
    case GST_STATE_READY_TO_NULL:
      break;
    default:
      break;
  }

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

  return GST_STATE_SUCCESS;
}