I'm too lazy to comment this

Original commit message from CVS:
New dxr3 plugins from Martin Soto <soto@informatik.uni-kl.de>

1 files changed, 810 insertions, 0 deletions

diff --git a/sys/dxr3/dxr3audiosink.c b/sys/dxr3/dxr3audiosink.c
new file mode 100644
index 00000000..41012096
--- /dev/null
+++ b/sys/dxr3/dxr3audiosink.c
@@ -0,0 +1,810 @@
+/* GStreamer
+ * Copyright (C) 2003 Martin Soto <martinsoto@users.sourceforge.net>
+ *
+ * dxr3audiosink.c: Audio sink for em8300 based DVD cards.
+ *
+ * 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.
+ */
+
+#include <errno.h>
+#include <string.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <sys/ioctl.h>
+
+#include <linux/soundcard.h>
+#include <linux/em8300.h>
+
+#include <gst/gst.h>
+
+#include "dxr3audiosink.h"
+#include "dxr3marshal.h"
+#include "dxr3common.h"
+
+/* Our only supported AC3 byte rate. */
+#define AC3_BYTE_RATE 48000
+
+/* Determines the amount of time to play the given number of bytes of
+   the original AC3 stream.  The result is expressed as MPEG2. */
+#define TIME_FOR_BYTES(bytes) (((bytes) * 90) / 48)
+
+
+/* ElementFactory information. */
+static GstElementDetails dxr3audiosink_details = {
+  "dxr3/Hollywood+ mpeg decoder board audio plugin",
+  "audio/raw|a52",
+  "GPL",
+  "Feeds audio to Sigma Designs em8300 based boards",
+  VERSION,
+  "Martin Soto <martinsoto@users.sourceforge.net>",
+  "(C) 2003",
+};
+
+
+/* Dxr3AudioSink signals and args */
+enum {
+  SIGNAL_FLUSHED,
+  LAST_SIGNAL
+};
+
+enum {
+  ARG_0,
+  ARG_DIGITAL_PCM
+};
+
+
+GST_PAD_TEMPLATE_FACTORY (dxr3audiosink_pcm_sink_factory,
+  "pcm_sink",
+  GST_PAD_SINK,
+  GST_PAD_ALWAYS,
+  GST_CAPS_NEW (
+    "dxr3audiosink_pcm_sink",
+    "audio/raw",
+      "format",            GST_PROPS_STRING ("int"),
+       "law",              GST_PROPS_INT (0),
+       "endianness",       GST_PROPS_INT (G_BYTE_ORDER),
+       "signed",           GST_PROPS_BOOLEAN (TRUE),
+       "width",            GST_PROPS_INT (16),
+       "depth",            GST_PROPS_INT (16),
+       "rate",             GST_PROPS_LIST (
+	                     GST_PROPS_INT (32000),
+	                     GST_PROPS_INT (44100),
+	                     GST_PROPS_INT (48000),
+	                     GST_PROPS_INT (66000)
+                           ),
+       "channels",         GST_PROPS_INT (2)
+  )
+)
+
+GST_PAD_TEMPLATE_FACTORY (dxr3audiosink_ac3_sink_factory,
+  "ac3_sink",
+  GST_PAD_SINK,
+  GST_PAD_ALWAYS,
+  GST_CAPS_NEW (
+    "dxr3audiosink_ac3_sink",
+    "audio/a52",
+    NULL
+  )
+)
+
+
+GST_PAD_EVENT_MASK_FUNCTION(dxr3audiosink_get_event_mask,
+  { GST_EVENT_FLUSH, 0 },
+  { GST_EVENT_DISCONTINUOUS, 0 },
+  { GST_EVENT_NEW_MEDIA, 0 },
+  { GST_EVENT_EOS, 0 }
+)
+
+
+static void	dxr3audiosink_class_init   	(Dxr3AudioSinkClass *klass);
+static void	dxr3audiosink_init		(Dxr3AudioSink *sink);
+
+static void	dxr3audiosink_set_property	(GObject *object,
+                                                 guint prop_id, 
+                                                 const GValue *value,
+                                                 GParamSpec *pspec);
+static void	dxr3audiosink_get_property	(GObject *object,
+                                                 guint prop_id, 
+						 GValue *value,
+                                                 GParamSpec *pspec);
+
+static gboolean dxr3audiosink_open	 	(Dxr3AudioSink *sink);
+static gboolean dxr3audiosink_set_mode_pcm	(Dxr3AudioSink *sink);
+static gboolean dxr3audiosink_set_mode_ac3	(Dxr3AudioSink *sink);
+static void 	dxr3audiosink_close 		(Dxr3AudioSink *sink);
+static void	dxr3audiosink_set_clock		(GstElement *element,
+                                                 GstClock *clock);
+
+static GstPadLinkReturn	dxr3audiosink_pcm_sinklink (GstPad *pad,
+                                                    GstCaps *caps);
+static void	dxr3audiosink_set_scr		(Dxr3AudioSink *sink,
+                                                 guint32 scr);
+
+static gboolean dxr3audiosink_handle_event      (GstPad *pad,
+                                                 GstEvent *event);
+static void	dxr3audiosink_chain_pcm		(GstPad *pad,GstBuffer *buf);
+static void	dxr3audiosink_chain_ac3		(GstPad *pad, GstBuffer *buf);
+
+/* static void	dxr3audiosink_wait		(Dxr3AudioSink *sink, */
+/*                                                  GstClockTime time); */
+/* static int	dxr3audiosink_mvcommand		(Dxr3AudioSink *sink, */
+/*                                                  int command); */
+
+static GstElementStateReturn dxr3audiosink_change_state (GstElement *element);
+
+static void	dxr3audiosink_flushed		(Dxr3AudioSink *sink);
+
+static GstElementClass *parent_class = NULL;
+static guint dxr3audiosink_signals[LAST_SIGNAL] = { 0 };
+
+
+extern GType
+dxr3audiosink_get_type (void) 
+{
+  static GType dxr3audiosink_type = 0;
+
+  if (!dxr3audiosink_type) {
+    static const GTypeInfo dxr3audiosink_info = {
+      sizeof(Dxr3AudioSinkClass),
+      NULL,
+      NULL,
+      (GClassInitFunc) dxr3audiosink_class_init,
+      NULL,
+      NULL,
+      sizeof (Dxr3AudioSink),
+      0,
+      (GInstanceInitFunc) dxr3audiosink_init,
+    };
+    dxr3audiosink_type = g_type_register_static (GST_TYPE_ELEMENT,
+                                                 "Dxr3AudioSink",
+                                                 &dxr3audiosink_info, 0);
+  }
+
+  return dxr3audiosink_type;
+}
+
+
+static void
+dxr3audiosink_class_init (Dxr3AudioSinkClass *klass) 
+{
+  GObjectClass *gobject_class;
+  GstElementClass *gstelement_class;
+
+  gobject_class = (GObjectClass*)klass;
+  gstelement_class = (GstElementClass*)klass;
+
+  parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
+
+  dxr3audiosink_signals[SIGNAL_FLUSHED] =
+    g_signal_new ("flushed", G_TYPE_FROM_CLASS (klass),
+                  G_SIGNAL_RUN_LAST,
+                  G_STRUCT_OFFSET (Dxr3AudioSinkClass, flushed),
+                  NULL, NULL,
+                  dxr3_marshal_VOID__VOID,
+                  G_TYPE_NONE, 0);
+
+  klass->flushed = dxr3audiosink_flushed;
+
+  g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_DIGITAL_PCM,
+    g_param_spec_boolean ("digital-pcm", "Digital PCM",
+                          "Use the digital output for PCM sound",
+                          FALSE, G_PARAM_READWRITE)); 
+
+  gobject_class->set_property = dxr3audiosink_set_property;
+  gobject_class->get_property = dxr3audiosink_get_property;
+
+  gstelement_class->change_state = dxr3audiosink_change_state;
+  gstelement_class->set_clock = dxr3audiosink_set_clock;
+}
+
+
+static void 
+dxr3audiosink_init (Dxr3AudioSink *sink) 
+{
+  GstCaps *caps;
+  GstPadTemplate *temp;
+
+  /* Create the PCM pad. */
+  temp = GST_PAD_TEMPLATE_GET (dxr3audiosink_pcm_sink_factory);
+  sink->pcm_sinkpad = gst_pad_new_from_template (temp, "pcm_sink");
+  gst_pad_set_chain_function (sink->pcm_sinkpad, dxr3audiosink_chain_pcm);
+  gst_pad_set_link_function (sink->pcm_sinkpad, dxr3audiosink_pcm_sinklink);
+  gst_element_add_pad (GST_ELEMENT (sink), sink->pcm_sinkpad);
+
+  /* Create the AC3 pad. */
+  temp = GST_PAD_TEMPLATE_GET (dxr3audiosink_ac3_sink_factory);
+  sink->ac3_sinkpad = gst_pad_new_from_template (temp, "ac3_sink");
+  caps = gst_pad_template_get_caps (temp);
+  gst_pad_try_set_caps (sink->ac3_sinkpad, caps);
+  gst_caps_unref (caps);
+  gst_pad_set_chain_function (sink->ac3_sinkpad, dxr3audiosink_chain_ac3);
+  gst_element_add_pad (GST_ELEMENT (sink), sink->ac3_sinkpad);
+
+  GST_FLAG_SET (GST_ELEMENT(sink), GST_ELEMENT_EVENT_AWARE);
+  gst_pad_set_event_function (sink->pcm_sinkpad, dxr3audiosink_handle_event);
+  gst_pad_set_event_mask_function (sink->pcm_sinkpad,
+                                   dxr3audiosink_get_event_mask);
+  gst_pad_set_event_function (sink->ac3_sinkpad, dxr3audiosink_handle_event);
+  gst_pad_set_event_mask_function (sink->ac3_sinkpad,
+                                   dxr3audiosink_get_event_mask);
+
+  sink->card_number = 0;
+
+  sink->audio_filename = NULL;
+  sink->audio_fd = -1;
+
+  sink->control_filename = NULL;
+  sink->control_fd = -1;
+
+  /* Since we don't know any better, we set the initial scr to 0. */
+  sink->scr = 0;
+
+  /* Initially don't use digital output. */
+  sink->digital_pcm = FALSE;
+
+  /* Initially there's no padder.*/
+  sink->padder = NULL;
+
+  sink->mode = DXR3AUDIOSINK_MODE_NONE;
+}
+
+
+static void
+dxr3audiosink_set_property (GObject *object, guint prop_id,
+                           const GValue *value, GParamSpec *pspec)
+{
+  Dxr3AudioSink *sink;
+
+  /* it's not null if we got it, but it might not be ours */
+  sink = DXR3AUDIOSINK (object);
+
+  switch (prop_id) {
+  case ARG_DIGITAL_PCM:
+    sink->digital_pcm = g_value_get_boolean (value);
+    /* Refresh the setup of the device. */
+    if (sink->mode == DXR3AUDIOSINK_MODE_PCM) {
+      dxr3audiosink_set_mode_pcm (sink);
+    }
+    g_object_notify (G_OBJECT (sink), "digital-pcm");
+    break;
+  default:
+    G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+    break;
+  }
+}
+
+
+static void   
+dxr3audiosink_get_property (GObject *object, guint prop_id,
+                            GValue *value, GParamSpec *pspec)
+{
+  Dxr3AudioSink *sink;
+ 
+  /* it's not null if we got it, but it might not be ours */
+  g_return_if_fail (GST_IS_DXR3AUDIOSINK (object));
+ 
+  sink = DXR3AUDIOSINK (object);
+  
+  switch (prop_id) {
+  case ARG_DIGITAL_PCM:
+    g_value_set_boolean (value, sink->digital_pcm);
+    break;
+  default:
+    G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+    break;
+  }
+}
+
+
+static gboolean
+dxr3audiosink_open (Dxr3AudioSink *sink)
+{
+  g_return_val_if_fail (!GST_FLAG_IS_SET (sink,
+                                          DXR3AUDIOSINK_OPEN), FALSE);
+
+  /* Compute the name of the audio device file. */
+  sink->audio_filename = g_strdup_printf ("/dev/em8300_ma-%d",
+                                          sink->card_number );
+
+  sink->audio_fd = open (sink->audio_filename, O_WRONLY);
+  if (sink->audio_fd < 0) {
+    gst_element_error (GST_ELEMENT (sink),
+                      g_strconcat ("Error opening device file \"",
+                                  sink->audio_filename, "\": ",
+                                  g_strerror (errno), NULL));
+    return FALSE;
+  }
+
+  /* Open the control device. */
+  sink->control_filename = g_strdup_printf ("/dev/em8300-%d",
+                                            sink->card_number );
+
+  sink->control_fd = open (sink->control_filename, O_WRONLY);
+  if (sink->control_fd < 0) {
+    gst_element_error (GST_ELEMENT (sink),
+                       g_strconcat ("Error opening device file \"",
+                                    sink->control_filename, "\": ",
+                                    g_strerror (errno), NULL));
+    return FALSE;
+  }
+
+  GST_FLAG_SET (sink, DXR3AUDIOSINK_OPEN);
+
+  dxr3audiosink_set_mode_pcm (sink);
+
+  return TRUE;
+}
+
+
+/**
+ * dxr3audiosink_set_mode:
+ * @sink: The sink element to operate on.
+ *
+ * Set the operation mode of the element to PCM.
+ */
+static gboolean
+dxr3audiosink_set_mode_pcm (Dxr3AudioSink *sink)
+{
+  int tmp, oss_mode, audiomode;
+
+  if (sink->audio_fd == -1 || sink->control_fd == -1) {
+    return FALSE;
+  }
+
+  /* Set the audio device mode. */
+  oss_mode = (G_BYTE_ORDER == G_BIG_ENDIAN ? AFMT_S16_BE : AFMT_S16_LE);
+  tmp = oss_mode;
+  if (ioctl (sink->audio_fd, SNDCTL_DSP_SETFMT, &tmp) < 0 ||
+      tmp != oss_mode) {
+    gst_element_error (GST_ELEMENT (sink),
+                       g_strconcat ("Error configuring device mode for \"",
+                                    sink->audio_filename, "\": ",
+                                    g_strerror (errno), NULL));
+    return FALSE;
+  }
+
+  /* Set the card's general audio output mode. */
+  audiomode = sink->digital_pcm ?
+    EM8300_AUDIOMODE_DIGITALPCM : EM8300_AUDIOMODE_ANALOG;
+  ioctl (sink->control_fd, EM8300_IOCTL_SET_AUDIOMODE, &audiomode);
+
+  /* Set the sampling rate. */
+  tmp = sink->rate;
+  if (ioctl (sink->audio_fd, SNDCTL_DSP_SPEED, &tmp) < 0) {
+    gst_element_error (GST_ELEMENT (sink),
+                       g_strconcat ("Error configuring device "
+                                    "sampling rate for \"",
+                                    sink->audio_filename, "\": ",
+                                    g_strerror (errno), NULL));
+    return FALSE;
+  }
+
+  /* Get rid of the padder, if any. */
+  if (sink->padder != NULL) {
+    g_free(sink->padder);
+    sink->padder = NULL;
+  }
+
+  sink->mode = DXR3AUDIOSINK_MODE_PCM;
+
+  return TRUE;
+}
+
+
+/**
+ * dxr3audiosink_set_mode:
+ * @sink: The sink element to operate on
+ *
+ * Set the operation mode of the element to AC3.
+ */
+static gboolean
+dxr3audiosink_set_mode_ac3 (Dxr3AudioSink *sink)
+{
+  int tmp, audiomode; 
+
+  if (sink->audio_fd == -1 || sink->control_fd == -1) {
+    return FALSE;
+  }
+
+  /* Set the sampling rate. */
+  tmp = AC3_BYTE_RATE;
+  if (ioctl (sink->audio_fd, SNDCTL_DSP_SPEED, &tmp) < 0 ||
+      tmp != AC3_BYTE_RATE) {
+    gst_element_error (GST_ELEMENT (sink),
+                       g_strconcat ("Error configuring device "
+                                    "sampling rate for \"",
+                                    sink->audio_filename, "\": ",
+                                    g_strerror (errno), NULL));
+    return FALSE;
+  }
+
+  /* Set the card's general audio output mode to AC3. */
+  audiomode = EM8300_AUDIOMODE_DIGITALAC3;
+  ioctl (sink->control_fd, EM8300_IOCTL_SET_AUDIOMODE, &audiomode);
+
+  /* Create a padder if necessary, */
+  if (sink->padder == NULL) {
+      sink->padder = g_malloc (sizeof(ac3_padder));
+      ac3p_init(sink->padder);
+  }
+
+  sink->mode = DXR3AUDIOSINK_MODE_AC3;
+
+  return TRUE;
+}
+
+
+static void
+dxr3audiosink_close (Dxr3AudioSink *sink)
+{
+  g_return_if_fail (GST_FLAG_IS_SET (sink, DXR3AUDIOSINK_OPEN));
+
+  if (close (sink->audio_fd) != 0) {
+    gst_element_error (GST_ELEMENT (sink),
+                       g_strconcat ("Error closing file \"",
+                                    sink->audio_filename, "\": ",
+                                    g_strerror (errno), NULL));
+    return;
+  }
+
+  if (close (sink->control_fd) != 0) {
+    gst_element_error (GST_ELEMENT (sink),
+                       g_strconcat ("Error closing file \"",
+                                    sink->control_filename, "\": ",
+                                    g_strerror (errno), NULL));
+    return;
+  }
+
+  GST_FLAG_UNSET (sink, DXR3AUDIOSINK_OPEN);
+
+  g_free (sink->audio_filename);
+  sink->audio_filename = NULL;
+
+  g_free (sink->control_filename);
+  sink->control_filename = NULL;
+
+  /* Get rid of the padder, if any. */
+  if (sink->padder != NULL) {
+    g_free(sink->padder);
+    sink->padder = NULL;
+  }
+}
+
+
+static void
+dxr3audiosink_set_clock (GstElement *element, GstClock *clock)
+{
+  Dxr3AudioSink *src = DXR3AUDIOSINK (element);
+
+  src->clock = clock;
+}
+
+
+static GstPadLinkReturn
+dxr3audiosink_pcm_sinklink (GstPad *pad, GstCaps *caps)
+{
+  Dxr3AudioSink *sink = DXR3AUDIOSINK (gst_pad_get_parent (pad));
+  const gchar* mimetype;
+  gint rate;
+
+  if (!GST_CAPS_IS_FIXED(caps)) {
+    return GST_PAD_LINK_DELAYED;
+  }
+
+  mimetype = gst_caps_get_mime(caps);
+  if (strcmp (mimetype, "audio/raw") != 0) {
+    return GST_PAD_LINK_REFUSED;
+  }
+
+  if (!gst_caps_has_property (caps, "rate")) {
+    return GST_PAD_LINK_REFUSED;
+  }
+
+  gst_caps_get_int (caps, "rate", &rate);
+  if (rate != 32000 && rate != 44100 &&
+      rate != 48000 && rate != 66000) {
+    return GST_PAD_LINK_DELAYED;
+  }
+  sink->rate = rate;
+
+  return GST_PAD_LINK_OK;
+}
+
+
+static void
+dxr3audiosink_set_scr (Dxr3AudioSink *sink, guint32 scr)
+{
+  guint32 zero = 0;
+
+/*   fprintf (stderr, "====== Adjusting SCR\n"); */
+  ioctl (sink->control_fd, EM8300_IOCTL_SCR_SET, &zero);
+  ioctl (sink->control_fd, EM8300_IOCTL_SCR_SET, &scr);
+}
+
+
+static gboolean
+dxr3audiosink_handle_event (GstPad *pad, GstEvent *event)
+{
+  GstEventType type;
+  Dxr3AudioSink *sink = DXR3AUDIOSINK (gst_pad_get_parent (pad));
+
+  type = event ? GST_EVENT_TYPE (event) : GST_EVENT_UNKNOWN;
+
+  switch (type) {
+  case GST_EVENT_FLUSH:
+    if (sink->control_fd >= 0) {
+      unsigned audiomode;
+
+      if (sink->mode == DXR3AUDIOSINK_MODE_AC3) {
+        audiomode = EM8300_AUDIOMODE_DIGITALPCM;
+        ioctl (sink->control_fd, EM8300_IOCTL_SET_AUDIOMODE, &audiomode);
+        audiomode = EM8300_AUDIOMODE_DIGITALAC3;
+        ioctl (sink->control_fd, EM8300_IOCTL_SET_AUDIOMODE, &audiomode);
+      }
+
+      /* Report the flush operation. */
+      g_signal_emit (G_OBJECT (sink),
+                     dxr3audiosink_signals[SIGNAL_FLUSHED], 0);
+    }
+    break;
+  default:
+    gst_pad_event_default (pad, event);
+    break;
+  }
+
+  return TRUE;
+}
+
+
+static void 
+dxr3audiosink_chain_pcm (GstPad *pad, GstBuffer *buf) 
+{
+  Dxr3AudioSink *sink;
+  gint bytes_written = 0;
+
+  g_return_if_fail (pad != NULL);
+  g_return_if_fail (GST_IS_PAD (pad));
+  g_return_if_fail (buf != NULL);
+
+  sink = DXR3AUDIOSINK (gst_pad_get_parent (pad));
+
+  if (GST_IS_EVENT (buf)) {
+    dxr3audiosink_handle_event (pad, GST_EVENT (buf));
+    return;
+  }
+
+  if (sink->mode != DXR3AUDIOSINK_MODE_PCM) {
+    /* Switch to PCM mode. */
+    dxr3audiosink_set_mode_pcm (sink);
+  }
+
+  if (GST_FLAG_IS_SET (sink, DXR3AUDIOSINK_OPEN)) {
+    if (GST_BUFFER_TIMESTAMP (buf) != GST_CLOCK_TIME_NONE) {
+      /* We have a new scr value. */
+      sink->scr = GSTTIME_TO_MPEGTIME (GST_BUFFER_TIMESTAMP (buf));
+    }
+
+    /* Update the system reference clock (SCR) in the card. */
+    {
+      unsigned in, out, odelay;
+      unsigned diff;
+
+      ioctl (sink->control_fd, EM8300_IOCTL_SCR_GET, &out);
+
+      ioctl (sink->audio_fd, SNDCTL_DSP_GETODELAY, &odelay);
+
+      in = MPEGTIME_TO_DXRTIME (sink->scr - (odelay * 90) / 192);
+      diff = in > out ? in - out : out - in;
+      if (diff > 1800) {
+        dxr3audiosink_set_scr (sink, in);
+      }
+    }
+
+    /* Update our SCR value. */
+    sink->scr += (unsigned) (GST_BUFFER_SIZE (buf) *
+                             (90000.0 / ((float)sink->rate * 4)));
+
+    /* Write the buffer to the sound device. */
+    bytes_written = write (sink->audio_fd, GST_BUFFER_DATA (buf),
+                           GST_BUFFER_SIZE (buf));
+    if (bytes_written < GST_BUFFER_SIZE (buf)) {
+      fprintf (stderr, "dxr3audiosink: Warning: %d bytes should be "
+               "written, only %d bytes written\n",
+               GST_BUFFER_SIZE (buf), bytes_written);
+    }
+  }
+
+  gst_buffer_unref (buf);
+}
+
+
+static void 
+dxr3audiosink_chain_ac3 (GstPad *pad, GstBuffer *buf) 
+{
+  Dxr3AudioSink *sink;
+  gint bytes_written = 0;
+
+  g_return_if_fail (pad != NULL);
+  g_return_if_fail (GST_IS_PAD (pad));
+  g_return_if_fail (buf != NULL);
+
+  sink = DXR3AUDIOSINK (gst_pad_get_parent (pad));
+
+  if (GST_IS_EVENT (buf)) {
+    dxr3audiosink_handle_event (pad, GST_EVENT (buf));
+    return;
+  }
+
+  if (sink->mode != DXR3AUDIOSINK_MODE_AC3) {
+    /* Switch to AC3 mode. */
+    dxr3audiosink_set_mode_ac3 (sink);
+  }
+
+  if (GST_FLAG_IS_SET (sink, DXR3AUDIOSINK_OPEN))
+  {
+    int event;
+
+    if (GST_BUFFER_TIMESTAMP (buf) != GST_CLOCK_TIME_NONE) {
+      /* We have a new scr value. */
+
+/*       fprintf (stderr, "------ Audio Time %.04f\n", */
+/*                (double) GST_BUFFER_TIMESTAMP (buf) / GST_SECOND); */
+
+      sink->scr = GSTTIME_TO_MPEGTIME (GST_BUFFER_TIMESTAMP (buf));
+    }
+
+    /* Push the new data into the padder. */
+    ac3p_push_data(sink->padder, GST_BUFFER_DATA (buf),
+                   GST_BUFFER_SIZE (buf));
+
+    /* Parse the data. */
+    event = ac3p_parse (sink->padder);
+    while (event != AC3P_EVENT_PUSH) {
+      switch (event) {
+      case AC3P_EVENT_FRAME:
+        /* We have a new frame: */
+
+        /* Update the system reference clock (SCR) in the card. */
+        {
+          unsigned in, out, odelay;
+          unsigned diff;
+
+          ioctl (sink->control_fd, EM8300_IOCTL_SCR_GET, &out);
+
+          ioctl (sink->audio_fd, SNDCTL_DSP_GETODELAY, &odelay);
+          /* 192000 bytes/sec */
+
+          in = MPEGTIME_TO_DXRTIME (sink->scr - (odelay * 90) / 192);
+          diff = in > out ? in - out : out - in;
+          if (diff > 1800) {
+            dxr3audiosink_set_scr (sink, in);
+          }
+        }
+
+        /* Update our SCR value. */
+        sink->scr += TIME_FOR_BYTES (ac3p_frame_size (sink->padder));
+
+        /* Write the frame to the sound device. */
+        bytes_written = write (sink->audio_fd, ac3p_frame (sink->padder),
+                               AC3P_IEC_FRAME_SIZE);
+
+        if (bytes_written < AC3P_IEC_FRAME_SIZE)
+        {
+          fprintf (stderr, "dxr3audiosink: Warning: %d bytes should be "
+                   "written, only %d bytes written\n",
+                   AC3P_IEC_FRAME_SIZE, bytes_written);
+        }
+
+        break;
+      }
+
+      event = ac3p_parse (sink->padder);
+    }
+  }
+
+  gst_buffer_unref(buf);
+}
+
+#if 0
+/**
+ * dxr3audiosink_wait:
+ * Make the sink wait the specified amount of time.
+ */
+static void
+dxr3audiosink_wait (Dxr3AudioSink *sink, GstClockTime time)
+{
+  GstClockID id;
+  GstClockTimeDiff jitter;
+  GstClockReturn ret;
+  GstClockTime current_time = gst_clock_get_time (sink->clock);
+
+  id = gst_clock_new_single_shot_id (sink->clock, current_time + time);
+  ret = gst_clock_id_wait (id, &jitter);
+  gst_clock_id_free (id);
+}
+
+
+static int
+dxr3audiosink_mvcommand (Dxr3AudioSink *sink, int command)
+{
+  em8300_register_t regs;
+  
+  regs.microcode_register = 1;
+  regs.reg = 0;
+  regs.val = command;
+  
+  return ioctl (sink->control_fd, EM8300_IOCTL_WRITEREG, &regs);
+}
+#endif
+
+static GstElementStateReturn
+dxr3audiosink_change_state (GstElement *element)
+{
+  g_return_val_if_fail (GST_IS_DXR3AUDIOSINK (element), GST_STATE_FAILURE);
+
+  if (GST_STATE_PENDING (element) == GST_STATE_NULL) {
+    if (GST_FLAG_IS_SET (element, DXR3AUDIOSINK_OPEN)) {
+      dxr3audiosink_close (DXR3AUDIOSINK (element));
+    }
+  }
+  else {
+    if (!GST_FLAG_IS_SET (element, DXR3AUDIOSINK_OPEN)) {
+      if (!dxr3audiosink_open (DXR3AUDIOSINK (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;
+}
+
+
+/**
+ * dxr3audiosink_flushed:
+ *
+ * Default do nothing implementation for the "flushed" signal.  The
+ * "flushed" signal will be fired right after flushing the hardware
+ * queues due to a received flush event 
+ */
+static void
+dxr3audiosink_flushed (Dxr3AudioSink *sink)
+{
+  /* Do nothing. */
+}
+
+
+extern gboolean 
+dxr3audiosink_factory_init (GstPlugin *plugin) 
+{ 
+  GstElementFactory *factory;
+
+  factory = gst_element_factory_new ("dxr3audiosink",
+                                     GST_TYPE_DXR3AUDIOSINK,
+                                     &dxr3audiosink_details);
+  g_return_val_if_fail (factory != NULL, FALSE);
+  gst_element_factory_add_pad_template (factory,
+                     GST_PAD_TEMPLATE_GET (dxr3audiosink_pcm_sink_factory));
+  gst_element_factory_add_pad_template (factory,
+                     GST_PAD_TEMPLATE_GET (dxr3audiosink_ac3_sink_factory));
+
+  gst_plugin_add_feature (plugin, GST_PLUGIN_FEATURE (factory));
+
+  return TRUE;
+}