/* GStreamer mplex (mjpegtools) wrapper
 * (c) 2003 Ronald Bultje <rbultje@ronald.bitfreak.net>
 *
 * gstmplex.cc: gstreamer mplex wrapper
 *
 * 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 "gstmplex.hh"
#include "gstmplexoutputstream.hh"
#include "gstmplexibitstream.hh"
#include "gstmplexjob.hh"

static GstStaticPadTemplate src_templ = GST_STATIC_PAD_TEMPLATE ("src",
    GST_PAD_SRC,
    GST_PAD_ALWAYS,
    GST_STATIC_CAPS ("video/mpeg, " "systemstream = (boolean) true")
    );

static GstStaticPadTemplate video_sink_templ =
GST_STATIC_PAD_TEMPLATE ("video_%d",
    GST_PAD_SINK,
    GST_PAD_REQUEST,
    GST_STATIC_CAPS ("video/mpeg, "
        "mpegversion = (int) [ 1, 2 ], " "systemstream = (boolean) false")
    );

static GstStaticPadTemplate audio_sink_templ =
    GST_STATIC_PAD_TEMPLATE ("audio_%d",
    GST_PAD_SINK,
    GST_PAD_REQUEST,
    GST_STATIC_CAPS ("audio/mpeg, "
        "mpegversion = (int) 1, "
        "layer = (int) [ 1, 2 ]; "
        "audio/x-ac3; "
        "audio/x-dts; "
        "audio/x-raw-int, "
        "endianness = (int) BYTE_ORDER, "
        "signed = (boolean) TRUE, "
        "width = (int) { 16, 20, 24 }, "
        "depth = (int) { 16, 20, 24 }, "
        "rate = (int) { 48000, 96000 }, " "channels = (int) [ 1, 6 ]")
    );

/* FIXME: subtitles */

static void gst_mplex_base_init (GstMplexClass * klass);
static void gst_mplex_class_init (GstMplexClass * klass);
static void gst_mplex_init (GstMplex * enc);
static void gst_mplex_dispose (GObject * object);

static void gst_mplex_loop (GstElement * element);

static GstPad *gst_mplex_request_new_pad (GstElement * element,
    GstPadTemplate * templ, const gchar * name);

static GstStateChangeReturn gst_mplex_change_state (GstElement * element,
    GstStateChange transition);

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

static GstElementClass *parent_class = NULL;

GType
gst_mplex_get_type (void)
{
  static GType gst_mplex_type = 0;

  if (!gst_mplex_type) {
    static const GTypeInfo gst_mplex_info = {
      sizeof (GstMplexClass),
      (GBaseInitFunc) gst_mplex_base_init,
      NULL,
      (GClassInitFunc) gst_mplex_class_init,
      NULL,
      NULL,
      sizeof (GstMplex),
      0,
      (GInstanceInitFunc) gst_mplex_init,
    };

    gst_mplex_type =
        g_type_register_static (GST_TYPE_ELEMENT,
        "GstMplex", &gst_mplex_info, (GTypeFlags) 0);
  }

  return gst_mplex_type;
}

static void
gst_mplex_base_init (GstMplexClass * klass)
{
  static GstElementDetails gst_mplex_details = {
    "mplex video multiplexer",
    "Codec/Muxer",
    "High-quality MPEG/DVD/SVCD/VCD video/audio multiplexer",
    "Andrew Stevens <andrew.stevens@nexgo.de>\n"
        "Ronald Bultje <rbultje@ronald.bitfreak.net>"
  };
  GstElementClass *element_class = GST_ELEMENT_CLASS (klass);

  gst_element_class_add_pad_template (element_class,
      gst_static_pad_template_get (&src_templ));
  gst_element_class_add_pad_template (element_class,
      gst_static_pad_template_get (&video_sink_templ));
  gst_element_class_add_pad_template (element_class,
      gst_static_pad_template_get (&audio_sink_templ));
  gst_element_class_set_details (element_class, &gst_mplex_details);
}

static void
gst_mplex_class_init (GstMplexClass * klass)
{
  GObjectClass *object_class = G_OBJECT_CLASS (klass);
  GstElementClass *element_class = GST_ELEMENT_CLASS (klass);

  parent_class = GST_ELEMENT_CLASS (g_type_class_ref (GST_TYPE_ELEMENT));

  /* register arguments */
  mjpeg_default_handler_verbosity (0);
  GstMplexJob::initProperties (object_class);

  object_class->set_property = gst_mplex_set_property;
  object_class->get_property = gst_mplex_get_property;

  object_class->dispose = gst_mplex_dispose;

  element_class->change_state = gst_mplex_change_state;
  element_class->request_new_pad = gst_mplex_request_new_pad;
}

static void
gst_mplex_dispose (GObject * object)
{
  GstMplex *mplex = GST_MPLEX (object);

  if (mplex->mux) {
    delete mplex->mux;

    mplex->mux = NULL;
  }
  delete mplex->job;
}

static void
gst_mplex_init (GstMplex * mplex)
{
  GstElement *element = GST_ELEMENT (mplex);

  GST_FLAG_SET (element, GST_ELEMENT_EVENT_AWARE);

  mplex->srcpad =
      gst_pad_new_from_template (gst_element_get_pad_template (element, "src"),
      "src");
  gst_element_add_pad (element, mplex->srcpad);

  mplex->job = new GstMplexJob ();
  mplex->mux = NULL;
  mplex->num_apads = 0;
  mplex->num_vpads = 0;

  gst_element_set_loop_function (element, gst_mplex_loop);
}

static void
gst_mplex_loop (GstElement * element)
{
  GstMplex *mplex = GST_MPLEX (element);

  if (!mplex->mux) {
    GstMplexOutputStream *out;
    const GList *item;

    for (item = gst_element_get_pad_list (element);
        item != NULL; item = item->next) {
      StreamKind type;
      GstMplexIBitStream *inputstream;
      JobStream *jobstream;
      GstPad *pad = GST_PAD (item->data);
      GstStructure *structure;
      const GstCaps *caps;
      const gchar *mime;

      /* skip our source pad */
      if (GST_PAD_DIRECTION (pad) == GST_PAD_SRC)
        continue;

      /* create inputstream, assure we've got caps */
      inputstream = new GstMplexIBitStream (pad);

      /* skip unnegotiated pads */
      if (!(caps = GST_PAD_CAPS (pad))) {
        delete inputstream;

        continue;
      }

      /* get format */
      structure = gst_caps_get_structure (caps, 0);
      mime = gst_structure_get_name (structure);

      if (!strcmp (mime, "video/mpeg")) {
        VideoParams *params;

        type = MPEG_VIDEO;

        params = VideoParams::Default (mplex->job->mux_format);
        mplex->job->video_param.push_back (params);
        mplex->job->video_tracks++;
      } else if (!strcmp (mime, "audio/mpeg")) {
        type = MPEG_AUDIO;
        mplex->job->audio_tracks++;
      } else if (!strcmp (mime, "audio/x-ac3")) {
        type = AC3_AUDIO;
        mplex->job->audio_tracks++;
      } else if (!strcmp (mime, "audio/x-dts")) {
        type = DTS_AUDIO;
        mplex->job->audio_tracks++;
      } else if (!strcmp (mime, "audio/x-raw-int")) {
        LpcmParams *params;
        gint bits, chans, rate;

        type = LPCM_AUDIO;

        /* set LPCM params */
        gst_structure_get_int (structure, "depth", &bits);
        gst_structure_get_int (structure, "rate", &rate);
        gst_structure_get_int (structure, "channels", &chans);
        params = LpcmParams::Checked (rate, chans, bits);

        mplex->job->lpcm_param.push_back (params);
        mplex->job->audio_tracks++;
        mplex->job->lpcm_tracks++;
      } else {
        delete inputstream;

        continue;
      }

      jobstream = new JobStream (inputstream, type);
      mplex->job->streams.push_back (jobstream);
    }

    if (!mplex->job->video_tracks && !mplex->job->audio_tracks) {
      GST_ELEMENT_ERROR (element, CORE, NEGOTIATION, (NULL),
          ("no input video or audio tracks set up before loop function"));
      return;
    }

    /* create new encoder with inputs/output */
    out = new GstMplexOutputStream (element, mplex->srcpad);
    mplex->mux = new Multiplexor (*mplex->job, *out);
  }

  mplex->mux->Multiplex ();
}

static GstPadLinkReturn
gst_mplex_sink_link (GstPad * pad, const GstCaps * caps)
{
  GstStructure *structure = gst_caps_get_structure (caps, 0);
  const gchar *mime = gst_structure_get_name (structure);

  /* raw audio caps needs to be fixed */
  if (!strcmp (mime, "audio/x-raw-int")) {
    gint width, depth;

    if (!gst_caps_is_fixed (caps))
      return GST_PAD_LINK_DELAYED;

    gst_structure_get_int (structure, "width", &width);
    gst_structure_get_int (structure, "depth", &depth);

    if (depth != width)
      return GST_PAD_LINK_REFUSED;
  }

  /* we do the actual inputstream setup in our first loopfunc cycle */
  return GST_PAD_LINK_OK;
}

static GstPad *
gst_mplex_request_new_pad (GstElement * element,
    GstPadTemplate * templ, const gchar * name)
{
  GstElementClass *klass = GST_ELEMENT_GET_CLASS (element);
  GstMplex *mplex = GST_MPLEX (element);
  gchar *padname;
  GstPad *newpad;

  if (templ == gst_element_class_get_pad_template (klass, "audio_%d")) {
    padname = g_strdup_printf ("audio_%d", mplex->num_apads++);
  } else if (templ == gst_element_class_get_pad_template (klass, "video_%d")) {
    padname = g_strdup_printf ("video_%d", mplex->num_vpads++);
  } else {
    g_warning ("mplex: this is not our template!");
    return NULL;
  }

  newpad = gst_pad_new_from_template (templ, padname);
  gst_pad_set_link_function (newpad, gst_mplex_sink_link);
  gst_element_add_pad (element, newpad);
  g_free (padname);

  return newpad;
}

static void
gst_mplex_get_property (GObject * object,
    guint prop_id, GValue * value, GParamSpec * pspec)
{
  GST_MPLEX (object)->job->getProperty (prop_id, value);
}

static void
gst_mplex_set_property (GObject * object,
    guint prop_id, const GValue * value, GParamSpec * pspec)
{
  GST_MPLEX (object)->job->setProperty (prop_id, value);
}

static GstStateChangeReturn
gst_mplex_change_state (GstElement * element, GstStateChange transition)
{
  GstMplex *mplex = GST_MPLEX (element);

  switch (transition) {
    case GST_STATE_CHANGE_PAUSED_TO_READY:
      delete mplex->mux;
      mplex->mux = NULL;
      mplex->num_apads = 0;
      mplex->num_vpads = 0;
      break;
    default:
      break;
  }

  if (parent_class->change_state)
    return parent_class->change_state (element, transition);

  return GST_STATE_CHANGE_SUCCESS;
}

static gboolean
plugin_init (GstPlugin * plugin)
{
  if (!gst_library_load ("gstbytestream"))
    return FALSE;

  return gst_element_register (plugin, "mplex", GST_RANK_NONE, GST_TYPE_MPLEX);
}

GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
    GST_VERSION_MINOR,
    "mplex",
    "High-quality MPEG/DVD/SVCD/VCD video/audio multiplexer",
    plugin_init, VERSION, "GPL", GST_PACKAGE, GST_ORIGIN)