libs/gst/base/gstcollectpads.h

/* GStreamer
 * Copyright (C) 2005 Wim Taymans <wim@fluendo.com>
 *
 * gstcollect_pads.h:
 *
 * 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.
 */

#ifndef __GST_COLLECT_PADS_H__
#define __GST_COLLECT_PADS_H__

#include <gst/gst.h>

G_BEGIN_DECLS

#define GST_TYPE_COLLECT_PADS  		 (gst_collect_pads_get_type())
#define GST_COLLECT_PADS(obj)  		 (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_COLLECT_PADS,GstCollectPads))
#define GST_COLLECT_PADS_CLASS(klass) 	 (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_COLLECT_PADS,GstCollectPadsClass))
#define GST_COLLECT_PADS_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj),GST_TYPE_COLLECT_PADS,GstCollectPadsClass))
#define GST_IS_COLLECT_PADS(obj)  	 (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_COLLECT_PADS))
#define GST_IS_COLLECT_PADS_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_COLLECT_PADS))

typedef struct _GstCollectData GstCollectData;
typedef struct _GstCollectPads GstCollectPads;
typedef struct _GstCollectPadsClass GstCollectPadsClass;

/**
 * GstCollectData:
 * @collect: owner #GstCollectPads
 * @pad: #GstPad managed by this data
 * @buffer: currently queued buffer.
 * @pos: position in the buffer
 * @segment: last segment received.
 *
 * Structure used by the collect_pads.
 */
struct _GstCollectData
{
  /* with LOCK of @collect */
  GstCollectPads 	*collect;
  GstPad		*pad;
  GstBuffer		*buffer;
  guint			 pos;
  GstSegment             segment;

  /*< private >*/
  union {
    struct {
      gboolean           flushing;
      gboolean           new_segment;
      gboolean           eos;
    } ABI;
    /* adding + 0 to mark ABI change to be undone later */
    gpointer _gst_reserved[GST_PADDING + 0];
  } abidata;
};

/**
 * GstCollectPadsFunction:
 * @pads: the #GstCollectPads that trigered the callback
 * @user_data: user data passed to gst_collect_pads_set_function()
 *
 * A function that will be called when all pads have received data.
 *
 * Returns: #GST_FLOW_OK for success
 */
typedef GstFlowReturn (*GstCollectPadsFunction) (GstCollectPads *pads, gpointer user_data);

#define GST_COLLECT_PADS_GET_PAD_LOCK(pads) (((GstCollectPads *)pads)->abidata.ABI.pad_lock)
#define GST_COLLECT_PADS_PAD_LOCK(pads)     (g_mutex_lock(GST_COLLECT_PADS_GET_PAD_LOCK (pads)))
#define GST_COLLECT_PADS_PAD_UNLOCK(pads)   (g_mutex_unlock(GST_COLLECT_PADS_GET_PAD_LOCK (pads)))

#define GST_COLLECT_PADS_GET_COND(pads) (((GstCollectPads *)pads)->cond)
#define GST_COLLECT_PADS_WAIT(pads)     (g_cond_wait (GST_COLLECT_PADS_GET_COND (pads), GST_OBJECT_GET_LOCK (pads)))
#define GST_COLLECT_PADS_SIGNAL(pads)   (g_cond_signal (GST_COLLECT_PADS_GET_COND (pads)))
#define GST_COLLECT_PADS_BROADCAST(pads)(g_cond_broadcast (GST_COLLECT_PADS_GET_COND (pads)))

/**
 * GstCollectPads:
 * @object: the #GstObject parent structure.
 * @data: #GList of #GstCollectData managed by this #GstCollectPads.
 *
 * Collectpads object. 
 */
struct _GstCollectPads {
  GstObject      object;

  /*< public >*/ /* with LOCK */
  GSList	*data;                  /* list of CollectData items */

  /*< private >*/
  guint32	 cookie;		/* @data list cookie */

  /* with LOCK */
  GCond		*cond;			/* to signal removal of data */

  GstCollectPadsFunction func;		/* function and user_data for callback */
  gpointer	 user_data;

  guint		 numpads;		/* number of pads in @data */
  guint		 queuedpads;		/* number of pads with a buffer */
  guint		 eospads;		/* number of pads that are EOS */

  /* with LOCK and PAD_LOCK*/
  gboolean	 started;

  /*< private >*/
  union {
    struct {
      /* since 0.10.6 */ /* with PAD_LOCK */
      GMutex    *pad_lock;		/* used to serialize add/remove */
      GSList    *pad_list;              /* updated pad list */
      guint32	 pad_cookie;            /* updated cookie */
    } ABI;
    /* adding + 0 to mark ABI change to be undone later */
    gpointer _gst_reserved[GST_PADDING + 0];
  } abidata;
};

struct _GstCollectPadsClass {
  GstObjectClass parent_class;

  /*< private >*/
  gpointer _gst_reserved[GST_PADDING];
};

GType gst_collect_pads_get_type(void);

/* creating the object */
GstCollectPads*	gst_collect_pads_new	 	(void);

/* set the callback */
void		gst_collect_pads_set_function 	(GstCollectPads *pads, GstCollectPadsFunction func,
						 gpointer user_data);

/* pad management */
GstCollectData*	gst_collect_pads_add_pad	(GstCollectPads *pads, GstPad *pad, guint size);
gboolean	gst_collect_pads_remove_pad	(GstCollectPads *pads, GstPad *pad);
gboolean	gst_collect_pads_is_active 	(GstCollectPads *pads, GstPad *pad);

/* start/stop collection */
GstFlowReturn	gst_collect_pads_collect 	(GstCollectPads *pads);
GstFlowReturn	gst_collect_pads_collect_range 	(GstCollectPads *pads, guint64 offset, guint length);

void		gst_collect_pads_start 		(GstCollectPads *pads);
void		gst_collect_pads_stop 		(GstCollectPads *pads);
void		gst_collect_pads_set_flushing	(GstCollectPads *pads, gboolean flushing);

/* get collected buffers */
GstBuffer*	gst_collect_pads_peek 		(GstCollectPads *pads, GstCollectData *data);
GstBuffer*	gst_collect_pads_pop		(GstCollectPads *pads, GstCollectData *data);

/* get collected bytes */
guint 		gst_collect_pads_available 	(GstCollectPads *pads);
guint		gst_collect_pads_read		(GstCollectPads *pads, GstCollectData *data,
						 guint8 **bytes, guint size);
guint 		gst_collect_pads_flush 		(GstCollectPads *pads, GstCollectData *data,
						 guint size);

G_END_DECLS

#endif /* __GST_COLLECT_PADS_H__ */