/* GStreamer
 * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
 *               <2000> Daniel Fischer <dan@f3c.com>
 *
 * 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 <gst/gst.h>
#include <string.h>
#include "gstdv1394src.h"

#define N_BUFFERS_IN_POOL 3

#define PAL_FRAMESIZE 144000
#define NTSC_FRAMESIZE 120000

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

enum
{
  ARG_0,
  ARG_CONSECUTIVE,
  ARG_SKIP,
  ARG_DROP_INCOMPLETE,
};

static GstElementDetails gst_dv1394src_details =
GST_ELEMENT_DETAILS ("Firewire (1394) DV Source",
    "Source/Video",
    "Source for DV video data from firewire port",
    "Erik Walthinsen <omega@temple-baptist.com>\n"
    "Daniel Fischer <dan@f3c.com>");

#if 0
static GstPadTemplate *
gst_dv1394src_factory (void)
{
  static GstPadTemplate *template = NULL;

  if (!template) {
    template = gst_pad_template_new ("src",
        GST_PAD_SRC,
        GST_PAD_ALWAYS,
        GST_STATIC_CAPS ("dv1394src",
            "video/x-dv",
            gst_props_new ("format", GST_PROPS_LIST (G_TYPE_STRING ("NTSC"),
                    G_TYPE_STRING ("PAL")
                ), NULL)
        ), NULL);
  }
  return template;
}
#endif

static void gst_dv1394src_base_init (gpointer g_class);
static void gst_dv1394src_class_init (GstDV1394SrcClass * klass);
static void gst_dv1394src_init (GstDV1394Src * filter);

static void gst_dv1394src_set_property (GObject * object, guint prop_id,
    const GValue * value, GParamSpec * pspec);
static void gst_dv1394src_get_property (GObject * object, guint prop_id,
    GValue * value, GParamSpec * pspec);

static GstElementStateReturn gst_dv1394src_change_state (GstElement * element);

static GstData *gst_dv1394src_get (GstPad * pad);

static GstElementClass *parent_class = NULL;

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

GType
gst_dv1394src_get_type (void)
{
  static GType gst_dv1394src_type = 0;

  if (!gst_dv1394src_type) {
    static const GTypeInfo gst_dv1394src_info = {
      sizeof (GstDV1394Src),
      gst_dv1394src_base_init,
      NULL,
      (GClassInitFunc) gst_dv1394src_class_init,
      NULL,
      NULL,
      sizeof (GstDV1394Src),
      0,
      (GInstanceInitFunc) gst_dv1394src_init,
    };

    gst_dv1394src_type =
        g_type_register_static (GST_TYPE_ELEMENT, "DV1394Src",
        &gst_dv1394src_info, 0);
  }
  return gst_dv1394src_type;
}

static void
gst_dv1394src_base_init (gpointer g_class)
{
  GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);

  gst_element_class_set_details (element_class, &gst_dv1394src_details);
}

static void
gst_dv1394src_class_init (GstDV1394SrcClass * klass)
{
  GObjectClass *gobject_class;
  GstElementClass *gstelement_class;

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

  g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_CONSECUTIVE,
      g_param_spec_int ("consecutive", "consecutive frames",
          "send n consecutive frames after skipping", 1, G_MAXINT, 1,
          G_PARAM_READWRITE));
  g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_SKIP,
      g_param_spec_int ("skip", "skip frames", "skip n frames", 0, G_MAXINT, 1,
          G_PARAM_READWRITE));
  g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_DROP_INCOMPLETE,
      g_param_spec_boolean ("drop_incomplete", "drop_incomplete",
          "drop incomplete frames", TRUE, G_PARAM_READWRITE));

  parent_class = g_type_class_ref (GST_TYPE_ELEMENT);

  gobject_class->set_property = gst_dv1394src_set_property;
  gobject_class->get_property = gst_dv1394src_get_property;

  gstelement_class->change_state = gst_dv1394src_change_state;
}

static void
gst_dv1394src_init (GstDV1394Src * dv1394src)
{
  dv1394src->srcpad = gst_pad_new ("src", GST_PAD_SRC);
  gst_pad_set_get_function (dv1394src->srcpad, gst_dv1394src_get);
  gst_pad_use_explicit_caps (dv1394src->srcpad);
  gst_element_add_pad (GST_ELEMENT (dv1394src), dv1394src->srcpad);

  dv1394src->card = 0;
  dv1394src->port = 0;
  dv1394src->channel = 63;

  dv1394src->consecutive = 1;
  dv1394src->skip = 0;
  dv1394src->drop_incomplete = TRUE;

  /* initialized when first header received */
  dv1394src->frameSize = 0;

  dv1394src->buf = NULL;
  dv1394src->frame = NULL;
  dv1394src->frameSequence = 0;
}

static void
gst_dv1394src_set_property (GObject * object, guint prop_id,
    const GValue * value, GParamSpec * pspec)
{
  GstDV1394Src *filter;

  /* it's not null if we got it, but it might not be ours */
  g_return_if_fail (GST_IS_DV1394SRC (object));
  filter = GST_DV1394SRC (object);

  switch (prop_id) {
    case ARG_SKIP:
      filter->skip = g_value_get_int (value);
      break;
    case ARG_CONSECUTIVE:
      filter->consecutive = g_value_get_int (value);
      break;
    case ARG_DROP_INCOMPLETE:
      filter->drop_incomplete = g_value_get_boolean (value);
      break;
    default:
      break;
  }
}

static void
gst_dv1394src_get_property (GObject * object, guint prop_id, GValue * value,
    GParamSpec * pspec)
{
  GstDV1394Src *filter;

  /* it's not null if we got it, but it might not be ours */
  g_return_if_fail (GST_IS_DV1394SRC (object));
  filter = GST_DV1394SRC (object);

  switch (prop_id) {
    case ARG_SKIP:
      g_value_set_int (value, filter->skip);
      break;
    case ARG_CONSECUTIVE:
      g_value_set_int (value, filter->consecutive);
      break;
    case ARG_DROP_INCOMPLETE:
      g_value_set_boolean (value, filter->drop_incomplete);
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
  }
}

static int
gst_dv1394src_iso_receive (raw1394handle_t handle, int channel, size_t len,
    quadlet_t * data)
{
  GstDV1394Src *dv1394src = GST_DV1394SRC (raw1394_get_userdata (handle));

  if (len > 16) {
    /*
       the following code taken from kino-0.51 (Dan Dennedy/Charles Yates)
     */
    unsigned char *p = (unsigned char *) &data[3];
    int section_type = p[0] >> 5;       /* section type is in bits 5 - 7 */
    int dif_sequence = p[1] >> 4;       /* dif sequence number is in bits 4 - 7 */
    int dif_block = p[2];

    /* if we are at the beginning of a frame, 
       we set buf=frame, and alloc a new buffer for frame
     */

    if (section_type == 0 && dif_sequence == 0) {       // dif header

      if (!dv1394src->negotiated) {
        // figure format (NTSC/PAL)
        if (p[3] & 0x80) {
          // PAL
          dv1394src->frameSize = PAL_FRAMESIZE;
          GST_DEBUG ("PAL data");
          if (!gst_pad_set_explicit_caps (dv1394src->srcpad,
                  gst_caps_new_simple ("video/x-dv",
                      "format", G_TYPE_STRING, "PAL", NULL))) {
            GST_ELEMENT_ERROR (dv1394src, CORE, NEGOTIATION, (NULL),
                ("Could not set source caps for PAL"));
            return 0;
          }
        } else {
          // NTSC (untested)
          dv1394src->frameSize = NTSC_FRAMESIZE;
          GST_DEBUG
              ("NTSC data [untested] - please report success/failure to <dan@f3c.com>");
          if (!gst_pad_set_explicit_caps (dv1394src->srcpad,
                  gst_caps_new_simple ("video/x-dv", "format", G_TYPE_STRING,
                      "NTSC", NULL))) {
            GST_ELEMENT_ERROR (dv1394src, CORE, NEGOTIATION, (NULL),
                ("Could not set source caps for NTSC"));
            return 0;
          }
        }
        dv1394src->negotiated = TRUE;
      }
      // drop last frame when not complete
      if (!dv1394src->drop_incomplete
          || dv1394src->bytesInFrame == dv1394src->frameSize) {
        dv1394src->buf = dv1394src->frame;
      } else {
        GST_INFO_OBJECT (GST_ELEMENT (dv1394src), "incomplete frame dropped");
      }
      dv1394src->frame = NULL;

      dv1394src->frameSequence++;

      if (dv1394src->frameSequence % (dv1394src->skip +
              dv1394src->consecutive) < dv1394src->consecutive) {
        dv1394src->frame = gst_buffer_new_and_alloc (dv1394src->frameSize);
      }
      dv1394src->bytesInFrame = 0;
    }

    if (dv1394src->frame != NULL) {
      void *data = GST_BUFFER_DATA (dv1394src->frame);


      switch (section_type) {
        case 0:                /* 1 Header block */
          /* p[3] |= 0x80; // hack to force PAL data */
          memcpy (data + dif_sequence * 150 * 80, p, 480);
          break;

        case 1:                /* 2 Subcode blocks */
          memcpy (data + dif_sequence * 150 * 80 + (1 + dif_block) * 80, p,
              480);
          break;

        case 2:                /* 3 VAUX blocks */
          memcpy (data + dif_sequence * 150 * 80 + (3 + dif_block) * 80, p,
              480);
          break;

        case 3:                /* 9 Audio blocks interleaved with video */
          memcpy (data + dif_sequence * 150 * 80 + (6 + dif_block * 16) * 80, p,
              480);
          break;

        case 4:                /* 135 Video blocks interleaved with audio */
          memcpy (data + dif_sequence * 150 * 80 + (7 + (dif_block / 15) +
                  dif_block) * 80, p, 480);
          break;

        default:               /* we canīt handle any other data */
          break;
      }
      dv1394src->bytesInFrame += 480;
    }
  }

  return 0;
}

static int
gst_dv1394src_bus_reset (raw1394handle_t handle, unsigned int generation)
{
  GST_INFO_OBJECT (GST_DV1394SRC (raw1394_get_userdata (handle)),
      "have bus reset");
  return 0;
}

static GstData *
gst_dv1394src_get (GstPad * pad)
{
  GstDV1394Src *dv1394src = GST_DV1394SRC (GST_PAD_PARENT (pad));

  dv1394src->buf = NULL;
  while (dv1394src->buf == NULL)
    raw1394_loop_iterate (dv1394src->handle);

  return GST_DATA (dv1394src->buf);
}

static GstElementStateReturn
gst_dv1394src_change_state (GstElement * element)
{
  GstDV1394Src *dv1394src;

  g_return_val_if_fail (GST_IS_DV1394SRC (element), GST_STATE_FAILURE);
  dv1394src = GST_DV1394SRC (element);

  switch (GST_STATE_TRANSITION (element)) {
    case GST_STATE_NULL_TO_READY:
      if ((dv1394src->handle = raw1394_new_handle ()) == NULL) {
        GST_INFO_OBJECT (dv1394src, "can't get raw1394 handle");
        return GST_STATE_FAILURE;
      }
      raw1394_set_userdata (dv1394src->handle, dv1394src);
      dv1394src->numcards =
          raw1394_get_port_info (dv1394src->handle, dv1394src->pinfo, 16);
      if (dv1394src->numcards == 0) {
        GST_INFO_OBJECT (dv1394src, "no cards available for raw1394");
        return GST_STATE_FAILURE;
      }
      if (dv1394src->pinfo[dv1394src->card].nodes <= 1) {
        GST_INFO_OBJECT (dv1394src, "there are no nodes on the 1394 bus");
        return GST_STATE_FAILURE;
      }
      if (raw1394_set_port (dv1394src->handle, dv1394src->port) < 0) {
        GST_INFO_OBJECT (dv1394src, "can't set 1394 port %d", dv1394src->port);
        return GST_STATE_FAILURE;
      }
      raw1394_set_iso_handler (dv1394src->handle, dv1394src->channel,
          gst_dv1394src_iso_receive);
      raw1394_set_bus_reset_handler (dv1394src->handle,
          gst_dv1394src_bus_reset);
      dv1394src->started = FALSE;
      GST_DEBUG ("successfully opened up 1394 connection");
      break;
    case GST_STATE_PAUSED_TO_PLAYING:
      if (raw1394_start_iso_rcv (dv1394src->handle, dv1394src->channel) < 0) {
        GST_INFO_OBJECT (dv1394src, "can't start 1394 iso receive");
        return GST_STATE_FAILURE;
      }
      break;
    case GST_STATE_PLAYING_TO_PAUSED:
      raw1394_stop_iso_rcv (dv1394src->handle, dv1394src->channel);
      break;
    case GST_STATE_READY_TO_NULL:
      raw1394_destroy_handle (dv1394src->handle);
      break;
    default:
      break;
  }

  /* if we haven't failed already, give the parent class a chance to ;-) */
  if (GST_ELEMENT_CLASS (parent_class)->change_state)
    return GST_ELEMENT_CLASS (parent_class)->change_state (element);

  return GST_STATE_SUCCESS;
}