gstreamer/ext/dv/gstdvdec.c

/* GStreamer
 * 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.
 */

#include <string.h>

/* First, include the header file for the plugin, to bring in the
 * object definition and other useful things.
 */
#include "gstdvdec.h"

#define NTSC_HEIGHT 480
#define NTSC_BUFFER 120000
#define PAL_HEIGHT 576
#define PAL_BUFFER 144000

/* The ElementDetails structure gives a human-readable description
 * of the plugin, as well as author and version data.
 */
static GstElementDetails dvdec_details = {
  "DV (smpte314) decoder plugin",
  "Decoder/DV",
  "Uses libdv to decode DV video (libdv.sourceforge.net)",
  VERSION,
  "Erik Walthinsen <omega@cse.ogi.edu>\n"
  "Wim Taymans <wim.taymans@tvd.be>",
  "(C) 2001-2002",
};


/* These are the signals that this element can fire.  They are zero-
 * based because the numbers themselves are private to the object.
 * LAST_SIGNAL is used for initialization of the signal array.
 */
enum {
  ASDF,
  /* FILL ME */
  LAST_SIGNAL
};

/* Arguments are identified the same way, but cannot be zero, so you
 * must leave the ARG_0 entry in as a placeholder.
 */
enum {
  ARG_0,
  /* FILL ME */
};

/* The PadFactory structures describe what pads the element has or
 * can have.  They can be quite complex, but for this dvdec plugin
 * they are rather simple.
 */
GST_PAD_TEMPLATE_FACTORY (sink_temp,
  "sink",
  GST_PAD_SINK,
  GST_PAD_ALWAYS,
  GST_CAPS_NEW (
    "dv_dec_sink",
    "video/dv",
    "format",   GST_PROPS_STRING ("NTSC")
  )
)


GST_PAD_TEMPLATE_FACTORY (video_src_temp,
  "video",
  GST_PAD_SRC,
  GST_PAD_ALWAYS,
  GST_CAPS_NEW (
    "dv_dec_src",
    "video/raw",
    "format",   	GST_PROPS_FOURCC (GST_MAKE_FOURCC ('Y','U','Y','2')),
    "width",    	GST_PROPS_INT (720),
    "height",  		GST_PROPS_INT_RANGE (NTSC_HEIGHT, PAL_HEIGHT)
  ),
  GST_CAPS_NEW (
    "dv_dec_src",
    "video/raw",
    "format", 		GST_PROPS_FOURCC(GST_MAKE_FOURCC('R','G','B',' ')),
    "bpp", 		GST_PROPS_INT(24),
    "depth", 		GST_PROPS_INT(24),
    "red_mask", 	GST_PROPS_INT(0x0000ff),
    "green_mask", 	GST_PROPS_INT(0x00ff00),
    "blue_mask", 	GST_PROPS_INT(0xff0000),
    "width",     	GST_PROPS_INT (720),
    "height",    	GST_PROPS_INT_RANGE (NTSC_HEIGHT, PAL_HEIGHT)
  )
)

GST_PAD_TEMPLATE_FACTORY ( audio_src_temp,
  "audio",
  GST_PAD_SRC,
  GST_PAD_ALWAYS,
  GST_CAPS_NEW (
    "arts_sample",
    "audio/raw",
    "format",   	GST_PROPS_STRING ("int"),
    "law",      	GST_PROPS_INT (0),
    "depth",   		GST_PROPS_INT (16),
    "width",    	GST_PROPS_INT (16),
    "signed",   	GST_PROPS_BOOLEAN (TRUE),
    "channels", 	GST_PROPS_INT (2),
    "endianness", 	GST_PROPS_INT (G_LITTLE_ENDIAN)
  )
)


/* A number of functon prototypes are given so we can refer to them later. */
static void		gst_dvdec_class_init	(GstDVDecClass *klass);
static void		gst_dvdec_init		(GstDVDec *dvdec);

static void		gst_dvdec_loop		(GstElement *element);

static GstElementStateReturn 	
			gst_dvdec_change_state 	(GstElement *element);

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

/* The parent class pointer needs to be kept around for some object
 * operations.
 */
static GstElementClass *parent_class = NULL;

/* This array holds the ids of the signals registered for this object.
 * The array indexes are based on the enum up above.
 */
/*static guint gst_dvdec_signals[LAST_SIGNAL] = { 0 }; */

/* This function is used to register and subsequently return the type
 * identifier for this object class.  On first invocation, it will
 * register the type, providing the name of the class, struct sizes,
 * and pointers to the various functions that define the class.
 */
GType
gst_dvdec_get_type (void)
{
  static GType dvdec_type = 0;

  if (!dvdec_type) {
    static const GTypeInfo dvdec_info = {
      sizeof (GstDVDecClass),      
      NULL,      
      NULL,
      (GClassInitFunc) gst_dvdec_class_init,
      NULL,
      NULL,
      sizeof (GstDVDec),
      0,
      (GInstanceInitFunc) gst_dvdec_init,
    };
    dvdec_type = g_type_register_static (GST_TYPE_ELEMENT, "GstDVDec", &dvdec_info, 0);
  }
  return dvdec_type;
}

/* In order to create an instance of an object, the class must be
 * initialized by this function.  GObject will take care of running
 * it, based on the pointer to the function provided above.
 */
static void
gst_dvdec_class_init (GstDVDecClass *klass)
{
  /* Class pointers are needed to supply pointers to the private
   * implementations of parent class methods.
   */
  GObjectClass *gobject_class;
  GstElementClass *gstelement_class;

  /* Since the dvdec class contains the parent classes, you can simply
   * cast the pointer to get access to the parent classes.
   */
  gobject_class = (GObjectClass*) klass;
  gstelement_class = (GstElementClass*) klass;

  /* The parent class is needed for class method overrides. */
  parent_class = g_type_class_ref (GST_TYPE_ELEMENT);

  gobject_class->set_property = gst_dvdec_set_property;
  gobject_class->get_property = gst_dvdec_get_property;

  gstelement_class->change_state = gst_dvdec_change_state;

  /* table initialization, only do once */
  dv_init();
}

/* This function is responsible for initializing a specific instance of
 * the plugin.
 */
static void
gst_dvdec_init(GstDVDec *dvdec)
{
  dvdec->sinkpad = gst_pad_new_from_template (GST_PAD_TEMPLATE_GET (sink_temp), "sink");
  gst_element_add_pad (GST_ELEMENT (dvdec), dvdec->sinkpad);

  dvdec->videosrcpad = gst_pad_new_from_template (GST_PAD_TEMPLATE_GET (video_src_temp), "video");
  gst_element_add_pad (GST_ELEMENT (dvdec), dvdec->videosrcpad);

  dvdec->audiosrcpad = gst_pad_new_from_template (GST_PAD_TEMPLATE_GET(audio_src_temp), "audio");
  gst_element_add_pad(GST_ELEMENT(dvdec),dvdec->audiosrcpad);

  gst_element_set_loop_function (GST_ELEMENT (dvdec), gst_dvdec_loop);

  dvdec->decoder = dv_decoder_new ();
  dvdec->decoder->quality = DV_QUALITY_BEST;
  dvdec->pool = NULL;
}

static gboolean
gst_dvdec_handle_event (GstDVDec *dvdec)
{
  guint32 remaining;
  GstEvent *event;
  GstEventType type;
	        
  gst_bytestream_get_status (dvdec->bs, &remaining, &event);
		  
  type = event? GST_EVENT_TYPE (event) : GST_EVENT_UNKNOWN;
		      
  switch (type) {
    case GST_EVENT_EOS:
      gst_pad_event_default (dvdec->sinkpad, event);
      break;
    case GST_EVENT_SEEK:
      g_warning ("seek event\n");
      gst_event_free (event);
      break;
    case GST_EVENT_FLUSH:
      g_warning ("flush event\n");
      gst_event_free (event);
      break;
    case GST_EVENT_DISCONTINUOUS:
      g_warning ("discont event\n");
      gst_event_free (event);
      break;
    default:
      g_warning ("unhandled event %d\n", type);
      gst_event_free (event);
      break;
  }
  return TRUE;
}


static void
gst_dvdec_loop (GstElement *element)
{   
  GstDVDec *dvdec;
  GstBuffer *buf, *outbuf;
  guint8 *inframe;
  guint8 *outframe;
  guint8 *outframe_ptrs[3];
  gint outframe_pitches[3];
  gboolean PAL;
  gint height;

  dvdec = GST_DVDEC (element);

  /* first read enough bytes to parse the header */
  inframe = gst_bytestream_peek_bytes (dvdec->bs, header_size);
  if (!inframe) {
    gst_dvdec_handle_event (dvdec);
    return;
  }
  dv_parse_header (dvdec->decoder, inframe);
  /* after parsing the header we know the size of the data */
  PAL = dv_system_50_fields (dvdec->decoder);

  height = (PAL ? PAL_HEIGHT : NTSC_HEIGHT);

  /* then read the read data */
  buf = gst_bytestream_read (dvdec->bs, (PAL ? PAL_BUFFER : NTSC_BUFFER));
  if (!buf) {
    gst_dvdec_handle_event (dvdec);
    return;
  }
  
  /* if we did not negotiate yet, do it now */
  if (!GST_PAD_CAPS (dvdec->videosrcpad)) {
    GstCaps *allowed;
    GstCaps *trylist;
    
    /* we what we are allowed to do */
    allowed = gst_pad_get_allowed_caps (dvdec->videosrcpad);

    /* try to fix our height */
    trylist = gst_caps_intersect (allowed,
				    GST_CAPS_NEW (
				      "dvdec_negotiate",
				      "video/raw",
				        "height",  	GST_PROPS_INT (height)
				    ));
    
    /* prepare for looping */
    trylist = gst_caps_normalize (trylist);

    while (trylist) {
      GstCaps *to_try = gst_caps_copy_1 (trylist);

      /* try each format */
      if (gst_pad_try_set_caps (dvdec->videosrcpad, to_try)) {
	guint32 fourcc;

	/* it worked, try to find what it was again */
	gst_caps_get_fourcc_int (to_try, "format", &fourcc);

	if (fourcc == GST_STR_FOURCC ("RGB ")) {
          dvdec->space = e_dv_color_rgb;
          dvdec->bpp = 3;
	}
	else {
          dvdec->space = e_dv_color_yuv;
          dvdec->bpp = 2;
	}
	break;
      }
      trylist = trylist->next;
    }
    /* oops list exhausted an nothing was found... */
    if (!trylist) {
      gst_element_error (element, "could not negotiate");
      return;
    }
  }
  /* try to grab a pool */
  if (!dvdec->pool) {
    dvdec->pool = gst_pad_get_bufferpool (dvdec->videosrcpad);
  }

  outbuf = NULL;
  /* try to get a buffer from the pool if we have one */
  if (dvdec->pool) {
    outbuf = gst_buffer_new_from_pool (dvdec->pool, 0, 0);
  }
  /* no buffer from pool, allocate one ourselves */
  if (!outbuf) {
    outbuf = gst_buffer_new ();
    
    GST_BUFFER_SIZE (outbuf) = (720 * height) * dvdec->bpp;
    GST_BUFFER_DATA (outbuf) = g_malloc (GST_BUFFER_SIZE (outbuf));
  }
    
  outframe = GST_BUFFER_DATA (outbuf);

  outframe_ptrs[0] = outframe;
  outframe_ptrs[1] = outframe_ptrs[0] + 720 * height;
  outframe_ptrs[2] = outframe_ptrs[1] + 360 * height;
  
  outframe_pitches[0] = 720 * dvdec->bpp;
  outframe_pitches[1] = height / 2;
  outframe_pitches[2] = height / 2;

  dv_decode_full_frame (dvdec->decoder, GST_BUFFER_DATA (buf), 
		        dvdec->space, outframe_ptrs, outframe_pitches);

  gst_buffer_unref (buf);

  gst_pad_push (dvdec->videosrcpad, outbuf);
}

static GstElementStateReturn
gst_dvdec_change_state (GstElement *element)
{
  GstDVDec *dvdec = GST_DVDEC (element);
	    
  switch (GST_STATE_TRANSITION (element)) {
    case GST_STATE_NULL_TO_READY:
      break;
    case GST_STATE_READY_TO_PAUSED:
      dvdec->bs = gst_bytestream_new (dvdec->sinkpad);
      break;
    case GST_STATE_PAUSED_TO_PLAYING:
      break;
    case GST_STATE_PLAYING_TO_PAUSED:
      dvdec->pool = NULL;
      break;
    case GST_STATE_PAUSED_TO_READY:
      gst_bytestream_destroy (dvdec->bs);
      break;
    case GST_STATE_READY_TO_NULL:
      break;
    default:
      break;
  }
	      
  parent_class->change_state (element);
	        
  return GST_STATE_SUCCESS;
}



/* Arguments are part of the Gtk+ object system, and these functions
 * enable the element to respond to various arguments.
 */
static void
gst_dvdec_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec)
{
  GstDVDec *dvdec;

  /* It's not null if we got it, but it might not be ours */
  g_return_if_fail(GST_IS_DVDEC(object));

  /* Get a pointer of the right type. */
  dvdec = GST_DVDEC(object);

  /* Check the argument id to see which argument we're setting. */
  switch (prop_id) {
    default:
      break;
  }
}

/* The set function is simply the inverse of the get fuction. */
static void
gst_dvdec_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
{
  GstDVDec *dvdec;

  /* It's not null if we got it, but it might not be ours */
  g_return_if_fail(GST_IS_DVDEC(object));
  dvdec = GST_DVDEC(object);

  switch (prop_id) {
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
  }
}

/* This is the entry into the plugin itself.  When the plugin loads,
 * this function is called to register everything that the plugin provides.
 */
static gboolean
plugin_init (GModule *module, GstPlugin *plugin)
{
  GstElementFactory *factory;

  if (!gst_library_load ("gstbytestream")) {
    gst_info("dvdec: could not load support library: 'gstbytestream'\n");
    return FALSE;
  }

  /* We need to create an ElementFactory for each element we provide.
   * This consists of the name of the element, the GType identifier,
   * and a pointer to the details structure at the top of the file.
   */
  factory = gst_element_factory_new("dvdec", GST_TYPE_DVDEC, &dvdec_details);
  g_return_val_if_fail(factory != NULL, FALSE);

  /* The pad templates can be easily generated from the factories above,
   * and then added to the list of padtemplates for the elementfactory.
   * Note that the generated padtemplates are stored in static global
   * variables, for the gst_dvdec_init function to use later on.
   */
  gst_element_factory_add_pad_template (factory, GST_PAD_TEMPLATE_GET(sink_temp));
  gst_element_factory_add_pad_template (factory, GST_PAD_TEMPLATE_GET(video_src_temp));
  gst_element_factory_add_pad_template (factory, GST_PAD_TEMPLATE_GET(audio_src_temp));

  /* The very last thing is to register the elementfactory with the plugin. */
  gst_plugin_add_feature (plugin, GST_PLUGIN_FEATURE (factory));

  return TRUE;
}

GstPluginDesc plugin_desc = {
  GST_VERSION_MAJOR,
  GST_VERSION_MINOR,
  "dvdec",
  plugin_init
};