/* GStreamer
 * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
 *                    2000 Wim Taymans <wim.taymans@chello.be>
 *
 * gstosssink.c: 
 *
 * 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 <sys/ioctl.h>
#include <sys/soundcard.h>
#include <errno.h>
#include <unistd.h>
#include <string.h>

#include "gstosssink.h"

/* elementfactory information */
static GstElementDetails gst_osssink_details = GST_ELEMENT_DETAILS (
  "Audio Sink (OSS)",
  "Sink/Audio",
  "Output to a sound card via OSS",
  "Erik Walthinsen <omega@cse.ogi.edu>, "
  "Wim Taymans <wim.taymans@chello.be>"
);

static void 			gst_osssink_base_init		(gpointer g_class);
static void 			gst_osssink_class_init		(GstOssSinkClass *klass);
static void 			gst_osssink_init		(GstOssSink *osssink);
static void 			gst_osssink_dispose		(GObject *object);

static GstElementStateReturn 	gst_osssink_change_state	(GstElement *element);
static void		 	gst_osssink_set_clock		(GstElement *element, GstClock *clock);
static GstClock* 		gst_osssink_get_clock 		(GstElement *element);
static GstClockTime 		gst_osssink_get_time 		(GstClock *clock, gpointer data);

static const GstFormat* 	gst_osssink_get_formats 	(GstPad *pad);
static gboolean 		gst_osssink_convert 		(GstPad *pad, GstFormat src_format, gint64 src_value,
	            						 GstFormat *dest_format, gint64 *dest_value);
static const GstQueryType* 	gst_osssink_get_query_types 	(GstPad *pad);
static gboolean 		gst_osssink_query 		(GstElement *element, GstQueryType type, 
								 GstFormat *format, gint64 *value);
static gboolean 		gst_osssink_sink_query 		(GstPad *pad, GstQueryType type,
								 GstFormat *format, gint64 *value);

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

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

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

/* OssSink signals and args */
enum {
  SIGNAL_HANDOFF,
  LAST_SIGNAL
};

enum {
  ARG_0,
  ARG_MUTE,
  ARG_FRAGMENT,
  ARG_BUFFER_SIZE,
  ARG_SYNC,
  ARG_CHUNK_SIZE,
  /* FILL ME */
};

static GstStaticPadTemplate osssink_sink_factory =
GST_STATIC_PAD_TEMPLATE (
  "sink",
  GST_PAD_SINK,
  GST_PAD_ALWAYS,
  GST_STATIC_CAPS ("audio/x-raw-int, "
      "endianness = (int) BYTE_ORDER, "
      "signed = (boolean) { TRUE, FALSE }, "
      "width = (int) { 8, 16 }, "
      "depth = (int) { 8, 16 }, "
      "rate = (int) [ 1000, 48000 ], "
      "channels = (int) [ 1, 2 ]"
  )
);

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

GType
gst_osssink_get_type (void)
{
  static GType osssink_type = 0;

  if (!osssink_type) {
    static const GTypeInfo osssink_info = {
      sizeof(GstOssSinkClass),
      gst_osssink_base_init,
      NULL,
      (GClassInitFunc)gst_osssink_class_init,
      NULL,
      NULL,
      sizeof(GstOssSink),
      0,
      (GInstanceInitFunc)gst_osssink_init,
    };
    osssink_type = g_type_register_static (GST_TYPE_OSSELEMENT, "GstOssSink", &osssink_info, 0);
  }

  return osssink_type;
}

static void
gst_osssink_dispose (GObject *object)
{
  GstOssSink *osssink = (GstOssSink *) object;

  gst_object_unparent (GST_OBJECT (osssink->provided_clock));

  G_OBJECT_CLASS (parent_class)->dispose (object);
}

static void
gst_osssink_base_init (gpointer g_class)
{
  GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
  
  gst_element_class_set_details (element_class, &gst_osssink_details);
  gst_element_class_add_pad_template (element_class, gst_static_pad_template_get (&osssink_sink_factory));
}
static void
gst_osssink_class_init (GstOssSinkClass *klass) 
{
  GObjectClass *gobject_class;
  GstElementClass *gstelement_class;

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

  parent_class = g_type_class_ref(GST_TYPE_OSSELEMENT);

  g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_MUTE,
    g_param_spec_boolean ("mute", "Mute", "Mute the audio",
                          FALSE, G_PARAM_READWRITE)); 
  g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_SYNC,
    g_param_spec_boolean ("sync", "Sync", "If syncing on timestamps should be enabled",
                          TRUE, G_PARAM_READWRITE)); 
  g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_FRAGMENT,
    g_param_spec_int ("fragment", "Fragment", 
	    	      "The fragment as 0xMMMMSSSS (MMMM = total fragments, 2^SSSS = fragment size)",
                      0, G_MAXINT, 6, G_PARAM_READWRITE));
  g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_BUFFER_SIZE,
    g_param_spec_uint ("buffer_size", "Buffer size", "Size of buffers in osssink's bufferpool (bytes)",
                       0, G_MAXINT, 4096, G_PARAM_READWRITE));
  g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_CHUNK_SIZE,
    g_param_spec_uint ("chunk_size", "Chunk size", "Write data in chunk sized buffers",
                       0, G_MAXUINT, 4096, G_PARAM_READWRITE));

  gst_osssink_signals[SIGNAL_HANDOFF] =
    g_signal_new ("handoff", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
                  G_STRUCT_OFFSET (GstOssSinkClass, handoff), NULL, NULL,
                  g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);
  
  gobject_class->set_property = gst_osssink_set_property;
  gobject_class->get_property = gst_osssink_get_property;
  gobject_class->dispose      = gst_osssink_dispose;
  
  gstelement_class->change_state = GST_DEBUG_FUNCPTR (gst_osssink_change_state);
  gstelement_class->query 	 = GST_DEBUG_FUNCPTR (gst_osssink_query);
  gstelement_class->set_clock 	 = gst_osssink_set_clock;
  gstelement_class->get_clock 	 = gst_osssink_get_clock;
  
}

static void 
gst_osssink_init (GstOssSink *osssink) 
{
  osssink->sinkpad = gst_pad_new_from_template (
		  gst_static_pad_template_get (&osssink_sink_factory), "sink");
  gst_element_add_pad (GST_ELEMENT (osssink), osssink->sinkpad);
  gst_pad_set_link_function (osssink->sinkpad, gst_osssink_sinkconnect);
  gst_pad_set_fixate_function (osssink->sinkpad, gst_osssink_sink_fixate);
  gst_pad_set_convert_function (osssink->sinkpad, gst_osssink_convert);
  gst_pad_set_query_function (osssink->sinkpad, gst_osssink_sink_query);
  gst_pad_set_query_type_function (osssink->sinkpad, gst_osssink_get_query_types);
  gst_pad_set_formats_function (osssink->sinkpad, gst_osssink_get_formats);

  gst_pad_set_chain_function (osssink->sinkpad, gst_osssink_chain);

  GST_DEBUG ("initializing osssink");
  osssink->bufsize = 4096;
  osssink->chunk_size = 4096;
  osssink->mute = FALSE;
  osssink->sync = TRUE;
  osssink->resync = TRUE;
  osssink->provided_clock = gst_audio_clock_new ("ossclock", gst_osssink_get_time, osssink);
  gst_object_set_parent (GST_OBJECT (osssink->provided_clock), GST_OBJECT (osssink));
  osssink->handled = 0;

  GST_FLAG_SET (osssink, GST_ELEMENT_THREAD_SUGGESTED);
  GST_FLAG_SET (osssink, GST_ELEMENT_EVENT_AWARE);
}

static GstCaps *
gst_osssink_sink_fixate (GstPad *pad, const GstCaps *caps)
{
  GstCaps *newcaps;
  GstStructure *structure;

  newcaps = gst_caps_new_full (gst_structure_copy(gst_caps_get_structure (caps, 0)), NULL);
  structure = gst_caps_get_structure (newcaps, 0);

  if (gst_caps_structure_fixate_field_nearest_int (structure, "rate", 44100)) {
    return newcaps;
  }
  if (gst_caps_structure_fixate_field_nearest_int (structure, "depth", 16)) {
    return newcaps;
  }
  if (gst_caps_structure_fixate_field_nearest_int (structure, "width", 16)) {
    return newcaps;
  }
  if (gst_caps_structure_fixate_field_nearest_int (structure, "channels", 2)) {
    return newcaps;
  }

  gst_caps_free (newcaps);

  return NULL;
}

static GstPadLinkReturn 
gst_osssink_sinkconnect (GstPad *pad, const GstCaps *caps) 
{
  GstOssSink *osssink = GST_OSSSINK (gst_pad_get_parent (pad));

  if (!gst_osselement_parse_caps (GST_OSSELEMENT (osssink), caps))
    return GST_PAD_LINK_REFUSED;

  if (!gst_osselement_sync_parms (GST_OSSELEMENT (osssink))) {
    return GST_PAD_LINK_REFUSED;
  }

  return GST_PAD_LINK_OK;
}

static inline gint
gst_osssink_get_delay (GstOssSink *osssink) 
{
  gint delay = 0;
  gint ret;

  if (GST_OSSELEMENT (osssink)->fd == -1)
    return 0;

#ifdef SNDCTL_DSP_GETODELAY
  ret = ioctl (GST_OSSELEMENT (osssink)->fd, SNDCTL_DSP_GETODELAY, &delay);
#else
  ret = -1;
#endif
  if (ret < 0) {
    audio_buf_info info;
    if (ioctl (GST_OSSELEMENT (osssink)->fd, SNDCTL_DSP_GETOSPACE, &info) < 0) {
      delay = 0;
    }
    else {
      delay = (info.fragstotal * info.fragsize) - info.bytes;	  
    }
  }

  return delay;
}

static GstClockTime 
gst_osssink_get_time (GstClock *clock, gpointer data) 
{
  GstOssSink *osssink = GST_OSSSINK (data);
  gint delay;
  GstClockTimeDiff res;

  if (!GST_OSSELEMENT (osssink)->bps)
    return 0;

  delay = gst_osssink_get_delay (osssink);

  /* sometimes delay is bigger than the number of bytes sent to the device,
   * which screws up this calculation, we assume that everything is still
   * in the device then
   * thomas: with proper handling of the return value, this doesn't seem to
   * happen anymore, so remove the second code path after april 2004 */
  if (delay > (gint64) osssink->handled) {
    /*g_warning ("Delay %d > osssink->handled %" G_GUINT64_FORMAT
               ", setting to osssink->handled",
               delay, osssink->handled);*/
    delay = osssink->handled;
  }
  res = ((gint64) osssink->handled - delay) * GST_SECOND / GST_OSSELEMENT (osssink)->bps;
  if (res < 0)
    res = 0;

  return res;
}

static GstClock*
gst_osssink_get_clock (GstElement *element)
{
  GstOssSink *osssink;
	    
  osssink = GST_OSSSINK (element);

  return GST_CLOCK (osssink->provided_clock);
}

static void
gst_osssink_set_clock (GstElement *element, GstClock *clock)
{
  GstOssSink *osssink;
  
  osssink = GST_OSSSINK (element);

  osssink->clock = clock;  
}

static void 
gst_osssink_chain (GstPad *pad, GstData *_data) 
{
  GstBuffer *buf = GST_BUFFER (_data);
  GstOssSink *osssink;
  GstClockTimeDiff buftime, soundtime, elementtime;
  guchar *data;
  guint to_write;
  gint delay;

  /* this has to be an audio buffer */
  osssink = GST_OSSSINK (gst_pad_get_parent (pad));

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

    switch (GST_EVENT_TYPE (event)) {
      case GST_EVENT_EOS:
        ioctl (GST_OSSELEMENT (osssink)->fd, SNDCTL_DSP_SYNC, 0);
	gst_audio_clock_set_active (GST_AUDIO_CLOCK (osssink->provided_clock), FALSE);
	gst_pad_event_default (pad, event);
        return;
      case GST_EVENT_DISCONTINUOUS:
        osssink->resync = TRUE;
        /* pass-through */
      default:
	gst_pad_event_default (pad, event);
        return;
    }
    g_assert_not_reached ();
  }

  if (!GST_OSSELEMENT (osssink)->bps) {
    gst_buffer_unref (buf);
    GST_ELEMENT_ERROR (osssink, CORE, NEGOTIATION, (NULL), ("format wasn't negotiated before chain function"));
    return;
  }

  data = GST_BUFFER_DATA (buf);
  to_write = GST_BUFFER_SIZE (buf);
  /* sync audio with buffers timestamp. elementtime is the *current* time.
   * soundtime is the time if the soundcard has processed all queued data. */
  elementtime = gst_element_get_time (GST_ELEMENT (osssink));
  delay = gst_osssink_get_delay (osssink);
  if (delay < 0)
    delay = 0;
  soundtime = elementtime + delay * GST_SECOND / GST_OSSELEMENT (osssink)->bps;
  if (GST_BUFFER_TIMESTAMP_IS_VALID (buf)) {
    buftime = GST_BUFFER_TIMESTAMP (buf);
  } else {
    buftime = soundtime;
  }
  GST_LOG_OBJECT (osssink, "time: real %"G_GUINT64_FORMAT", buffer: %"G_GUINT64_FORMAT,
      soundtime, buftime);
  if (MAX (buftime, soundtime) - MIN (buftime, soundtime) > (GST_SECOND / 10)) {
    /* we need to adjust to the buffers here */
    GST_INFO_OBJECT (osssink, "need sync: real %"G_GUINT64_FORMAT", buffer: %"G_GUINT64_FORMAT, 
	soundtime, buftime);
    if (soundtime > buftime) {
      /* do *not* throw frames out. It's useless. The next frame will come in
       * too late. And the next one. And so on. We don't want to lose sound.
       * This is a placeholder for what - some day - should become QoS, i.e.
       * sending events upstream to drop buffers. */
    } else {
      guint64 to_handle = (((buftime - soundtime) * GST_OSSELEMENT(osssink)->bps / GST_SECOND) /
		((GST_OSSELEMENT (osssink)->width / 8) * GST_OSSELEMENT (osssink)->channels)) *
		(GST_OSSELEMENT (osssink)->width / 8) * GST_OSSELEMENT (osssink)->channels;

      if (!osssink->resync) {
        guint8 *buf = g_new (guint8, to_handle);

        memset (buf, (GST_OSSELEMENT (osssink)->width == 8) ? 0 : 128, to_handle);
        while (to_handle > 0) {
          gint done = write (GST_OSSELEMENT (osssink)->fd, buf,
			     MIN (to_handle, osssink->chunk_size));
          if (done == -1 && errno != EINTR) { 
            break;
          } else {
            to_handle -= done;
            osssink->handled += done;
          }
        }
        g_free(buf);
      } else {
        /* Timestamps at start-of-stream (MPEG) or after seek (hey,
         * again MPEG!) can be borken, therefore this hacklet. */
        osssink->handled += to_handle;
      }
    }
  }

  if (GST_OSSELEMENT (osssink)->fd >= 0 && to_write > 0) {
    if (!osssink->mute) {

      while (to_write > 0) {
        gint done = write (GST_OSSELEMENT (osssink)->fd, data, 
                           MIN (to_write, osssink->chunk_size));
        if (done == -1) {
          if (errno != EINTR)
	    break;
	}
	else {
	  to_write -= done;
	  data += done;
	  osssink->handled += done;
	}
      }
    } else {
      g_warning ("muting osssinks unimplemented wrt clocks!");
    }
  }

  gst_audio_clock_update_time ((GstAudioClock*)osssink->provided_clock, gst_osssink_get_time (osssink->provided_clock, osssink));

  gst_buffer_unref (buf);
}

static const GstFormat*
gst_osssink_get_formats (GstPad *pad)
{
  static const GstFormat formats[] = {
    GST_FORMAT_TIME,
    GST_FORMAT_DEFAULT,
    GST_FORMAT_BYTES,
    0
  };
  return formats;
}

static gboolean
gst_osssink_convert (GstPad *pad, GstFormat src_format, gint64 src_value,
	             GstFormat *dest_format, gint64 *dest_value)
{
  GstOssSink *osssink;

  osssink = GST_OSSSINK (gst_pad_get_parent (pad));
  
  return gst_osselement_convert (GST_OSSELEMENT (osssink),
				 src_format, src_value,
		                 dest_format, dest_value);
}

static const GstQueryType*
gst_osssink_get_query_types (GstPad *pad)
{
  static const GstQueryType query_types[] = {
    GST_QUERY_LATENCY,
    GST_QUERY_POSITION,
    0,
  };
  return query_types;
}

static gboolean
gst_osssink_sink_query (GstPad *pad, GstQueryType type, GstFormat *format, gint64 *value) 
{
  gboolean res = TRUE;
  GstOssSink *osssink;

  osssink = GST_OSSSINK (gst_pad_get_parent (pad));
  
  switch (type) {
    case GST_QUERY_LATENCY:
      if (!gst_osssink_convert (pad, 
			        GST_FORMAT_BYTES, gst_osssink_get_delay (osssink),
		                format, value)) 
      {
        res = FALSE;
      }
      break;
    case GST_QUERY_POSITION:
      if (!gst_osssink_convert (pad, 
			        GST_FORMAT_TIME, gst_element_get_time (GST_ELEMENT (osssink)),
		                format, value)) 
      {
        res = FALSE;
      }
      break;
    default:
      res = gst_pad_query (gst_pad_get_peer (osssink->sinkpad), type, format, value);
      break;
  }

  return res;
}

static gboolean
gst_osssink_query (GstElement *element, GstQueryType type, GstFormat *format, gint64 *value) 
{
  GstOssSink *osssink = GST_OSSSINK (element);

  return gst_osssink_sink_query (osssink->sinkpad, type, format, value);
}

static void 
gst_osssink_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec) 
{
  GstOssSink *osssink;

  osssink = GST_OSSSINK (object);

  switch (prop_id) {
    case ARG_MUTE:
      osssink->mute = g_value_get_boolean (value);
      g_object_notify (G_OBJECT (osssink), "mute");
      break;
    case ARG_FRAGMENT:
      GST_OSSELEMENT (osssink)->fragment = g_value_get_int (value);
      gst_osselement_sync_parms (GST_OSSELEMENT (osssink));
      break;
    case ARG_BUFFER_SIZE:
      osssink->bufsize = g_value_get_uint (value);
      g_object_notify (object, "buffer_size");
      break;
    case ARG_SYNC:
      osssink->sync = g_value_get_boolean (value);
      g_object_notify (G_OBJECT (osssink), "sync");
      break;
    case ARG_CHUNK_SIZE:
      osssink->chunk_size = g_value_get_uint (value);
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
  }
}

static void 
gst_osssink_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec) 
{
  GstOssSink *osssink;

  osssink = GST_OSSSINK (object);

  switch (prop_id) {
    case ARG_MUTE:
      g_value_set_boolean (value, osssink->mute);
      break;
    case ARG_FRAGMENT:
      g_value_set_int (value, GST_OSSELEMENT (osssink)->fragment);
      break;
    case ARG_BUFFER_SIZE:
      g_value_set_uint (value, osssink->bufsize);
      break;
    case ARG_SYNC:
      g_value_set_boolean (value, osssink->sync);
      break;
    case ARG_CHUNK_SIZE:
      g_value_set_uint (value, osssink->chunk_size);
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
  }
}

static GstElementStateReturn 
gst_osssink_change_state (GstElement *element) 
{
  GstOssSink *osssink;

  osssink = GST_OSSSINK (element);

  switch (GST_STATE_TRANSITION (element)) {
    case GST_STATE_READY_TO_PAUSED:
      break;
    case GST_STATE_PAUSED_TO_PLAYING:
      gst_audio_clock_set_active (GST_AUDIO_CLOCK (osssink->provided_clock), TRUE);
      break;
    case GST_STATE_PLAYING_TO_PAUSED:
      if (GST_FLAG_IS_SET (element, GST_OSSSINK_OPEN)) 
        ioctl (GST_OSSELEMENT (osssink)->fd, SNDCTL_DSP_RESET, 0);
      gst_audio_clock_set_active (GST_AUDIO_CLOCK (osssink->provided_clock), FALSE);
      break;
    case GST_STATE_PAUSED_TO_READY:
      if (GST_FLAG_IS_SET (element, GST_OSSSINK_OPEN))
        ioctl (GST_OSSELEMENT (osssink)->fd, SNDCTL_DSP_RESET, 0);
      gst_osselement_reset (GST_OSSELEMENT (osssink));
      osssink->handled = 0;
      osssink->resync = TRUE;
      break;
    default:
      break;
  }
      
  if (GST_ELEMENT_CLASS (parent_class)->change_state)
    return GST_ELEMENT_CLASS (parent_class)->change_state (element);

  return GST_STATE_SUCCESS;
}