/* GStreamer

 * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>

 *                    2000 Wim Taymans <wtay@chello.be>

 *

 * gstbuffer.h: Header for GstBuffer object

 *

 * 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_BUFFER_H__

#define __GST_BUFFER_H__

#include <gst/gstminiobject.h>

#include <gst/gstclock.h>

#include <gst/gstcaps.h>

G_BEGIN_DECLS

typedef struct _GstBuffer GstBuffer;

typedef struct _GstBufferClass GstBufferClass;

/**

 * GST_BUFFER_TRACE_NAME:

 *

 * The name used for tracing memory allocations.

 */

#define GST_BUFFER_TRACE_NAME		"GstBuffer"

#define GST_TYPE_BUFFER				(gst_buffer_get_type())

#define GST_IS_BUFFER(obj)                      (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_BUFFER))

#define GST_IS_BUFFER_CLASS(klass)              (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_BUFFER))

#define GST_BUFFER_GET_CLASS(obj)               (G_TYPE_INSTANCE_GET_CLASS ((obj), GST_TYPE_BUFFER, GstBufferClass))

#define GST_BUFFER(obj)                         (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_BUFFER, GstBuffer))

#define GST_BUFFER_CLASS(klass)                 (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_BUFFER, GstBufferClass))

#define GST_BUFFER_CAST(obj)                    ((GstBuffer *)(obj))

/**

 * GST_BUFFER_FLAGS:

 * @buf: a #GstBuffer.

 *

 * A flags word containing #GstBufferFlag flags set on this buffer.

 */

#define GST_BUFFER_FLAGS(buf)                   GST_MINI_OBJECT_FLAGS(buf)

/**

 * GST_BUFFER_FLAG_IS_SET:

 * @buf: a #GstBuffer.

 * @flag: the #GstBufferFlag to check.

 *

 * Gives the status of a specific flag on a buffer.

 */

#define GST_BUFFER_FLAG_IS_SET(buf,flag)        GST_MINI_OBJECT_FLAG_IS_SET (buf, flag)

/**

 * GST_BUFFER_FLAG_SET:

 * @buf: a #GstBuffer.

 * @flag: the #GstBufferFlag to set.

 *

 * Sets a buffer flag on a buffer.

 */

#define GST_BUFFER_FLAG_SET(buf,flag)           GST_MINI_OBJECT_FLAG_SET (buf, flag)

/**

 * GST_BUFFER_FLAG_UNSET:

 * @buf: a #GstBuffer.

 * @flag: the #GstBufferFlag to clear.

 *

 * Clears a buffer flag.

 */

#define GST_BUFFER_FLAG_UNSET(buf,flag)         GST_MINI_OBJECT_FLAG_UNSET (buf, flag)

/**

 * GST_BUFFER_DATA:

 * @buf: a #GstBuffer.

 *

 * A pointer to the data element of this buffer.

 */

#define GST_BUFFER_DATA(buf)			(GST_BUFFER_CAST(buf)->data)

/**

 * GST_BUFFER_SIZE:

 * @buf: a #GstBuffer.

 *

 * The size in bytes of the data in this buffer.

 */

#define GST_BUFFER_SIZE(buf)			(GST_BUFFER_CAST(buf)->size)

/**

 * GST_BUFFER_TIMESTAMP:

 * @buf: a #GstBuffer.:

 *

 * The timestamp in nanoseconds (as a #GstClockTime) of the data in the buffer.

 * Value will be %GST_CLOCK_TIME_NONE if the timestamp is unknown.

 *

 */

#define GST_BUFFER_TIMESTAMP(buf)		(GST_BUFFER_CAST(buf)->timestamp)

/**

 * GST_BUFFER_DURATION:

 * @buf: a #GstBuffer.

 *

 * The duration in nanoseconds (as a #GstClockTime) of the data in the buffer.

 * Value will be %GST_CLOCK_TIME_NONE if the duration is unknown.

 */

#define GST_BUFFER_DURATION(buf)		(GST_BUFFER_CAST(buf)->duration)

/**

 * GST_BUFFER_CAPS:

 * @buf: a #GstBuffer.

 *

 * The caps for this buffer.

 */

#define GST_BUFFER_CAPS(buf)			(GST_BUFFER_CAST(buf)->caps)

/**

 * GST_BUFFER_OFFSET:

 * @buf: a #GstBuffer.

 *

 * The offset in the source file of the beginning of this buffer.

 */

#define GST_BUFFER_OFFSET(buf)			(GST_BUFFER_CAST(buf)->offset)

/**

 * GST_BUFFER_OFFSET_END:

 * @buf: a #GstBuffer.

 *

 * The offset in the source file of the end of this buffer.

 */

#define GST_BUFFER_OFFSET_END(buf)		(GST_BUFFER_CAST(buf)->offset_end)

/**

 * GST_BUFFER_MALLOCDATA:

 * @buf: a #GstBuffer.

 *

 * A pointer to any data allocated for this buffer using g_malloc(). If this is 

 * non-NULL, this memory will be freed at the end of the buffer's lifecycle 

 * (i.e. when its refcount becomes zero).

 */

#define GST_BUFFER_MALLOCDATA(buf)		(GST_BUFFER_CAST(buf)->malloc_data)

/**

 * GST_BUFFER_OFFSET_NONE:

 *

 * Constant for no-offset return results.

 */

#define GST_BUFFER_OFFSET_NONE	((guint64)-1)

/**

 * GST_BUFFER_DURATION_IS_VALID:

 * @buffer: a #GstBuffer

 *

 * Tests if the duration is known.

 */

#define GST_BUFFER_DURATION_IS_VALID(buffer)	(GST_CLOCK_TIME_IS_VALID (GST_BUFFER_DURATION (buffer)))

/**

 * GST_BUFFER_TIMESTAMP_IS_VALID:

 * @buffer: a #GstBuffer

 *

 * Tests if the timestamp is known.

 */

#define GST_BUFFER_TIMESTAMP_IS_VALID(buffer)	(GST_CLOCK_TIME_IS_VALID (GST_BUFFER_TIMESTAMP (buffer)))

/**

 * GST_BUFFER_OFFSET_IS_VALID:

 * @buffer: a #GstBuffer

 *

 * Tests if the start offset is known.

 */

#define GST_BUFFER_OFFSET_IS_VALID(buffer)	(GST_BUFFER_OFFSET (buffer) != GST_BUFFER_OFFSET_NONE)

/**

 * GST_BUFFER_OFFSET_END_IS_VALID:

 * @buffer: a #GstBuffer

 *

 * Tests if the end offset is known.

 */

#define GST_BUFFER_OFFSET_END_IS_VALID(buffer)	(GST_BUFFER_OFFSET_END (buffer) != GST_BUFFER_OFFSET_NONE)

/**

 * GST_BUFFER_IS_DISCONT:

 * @buffer: a #GstBuffer

 *

 * Tests if the buffer marks a discontinuity in the stream.

 *

 * Since: 0.10.9

 */

#define GST_BUFFER_IS_DISCONT(buffer)	(GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DISCONT))

/**

 * GstBufferFlag:

 * @GST_BUFFER_FLAG_READONLY: the buffer is read-only. This means the data of

 * the buffer should not be modified. The metadata might still be modified.

 * @GST_BUFFER_FLAG_PREROLL: the buffer is part of a preroll and should not be

 * displayed.

 * @GST_BUFFER_FLAG_DISCONT: the buffer marks a discontinuity in the stream.

 * This typically occurs after a seek or a dropped buffer from a live or

 * network source.

 * @GST_BUFFER_FLAG_IN_CAPS: the buffer has been added as a field in a #GstCaps.

 * @GST_BUFFER_FLAG_GAP: the buffer has been created to fill a gap in the

 * stream and contains media neutral data (elements can switch to optimized code

 * path that ignores the buffer content).

 * @GST_BUFFER_FLAG_DELTA_UNIT: this unit cannot be decoded independently.

 * @GST_BUFFER_FLAG_LAST: additional flags can be added starting from this flag.

 *

 * A set of buffer flags used to describe properties of a #GstBuffer.

 */

typedef enum {

  GST_BUFFER_FLAG_READONLY   = GST_MINI_OBJECT_FLAG_READONLY,

  GST_BUFFER_FLAG_PREROLL    = (GST_MINI_OBJECT_FLAG_LAST << 0),

  GST_BUFFER_FLAG_DISCONT    = (GST_MINI_OBJECT_FLAG_LAST << 1),

  GST_BUFFER_FLAG_IN_CAPS    = (GST_MINI_OBJECT_FLAG_LAST << 2),

  GST_BUFFER_FLAG_GAP        = (GST_MINI_OBJECT_FLAG_LAST << 3),

  GST_BUFFER_FLAG_DELTA_UNIT = (GST_MINI_OBJECT_FLAG_LAST << 4),

  /* padding */

  GST_BUFFER_FLAG_LAST       = (GST_MINI_OBJECT_FLAG_LAST << 8)

} GstBufferFlag;

/**

 * GstBuffer:

 * @mini_object: the parent structure

 * @data: pointer to the buffer data

 * @size: size of buffer data

 * @timestamp: timestamp of the buffer, can be #GST_CLOCK_TIME_NONE when the

 *     timestamp is not known or relevant.

 * @duration: duration in time of the buffer data, can be #GST_CLOCK_TIME_NONE

 *     when the duration is not known or relevant.

 * @caps: the #GstCaps describing the data format in this buffer

 * @offset: a media specific offset for the buffer data. 

 *     For video frames, this is the frame number of this buffer.

 *     For audio samples, this is the offset of the first sample in this buffer.

 *     For file data or compressed data this is the byte offset of the first

 *       byte in this buffer.

 * @offset_end: the last offset contained in this buffer. It has the same 

 *     format as @offset.

 * @malloc_data: a pointer to the allocated memory associated with this buffer.

 *     When the buffer is freed, this data will freed with g_free().

 *

 * The structure of a #GstBuffer. Use the associated macros to access the public

 * variables.

 */

struct _GstBuffer {

  GstMiniObject		 mini_object;

  /*< public >*/ /* with COW */

  /* pointer to data and its size */

  guint8		*data;

  guint			 size;

  /* timestamp */

  GstClockTime		 timestamp;

  GstClockTime		 duration;

  /* the media type of this buffer */

  GstCaps		*caps;

  /* media specific offset */

  guint64		 offset;

  guint64		 offset_end;

  guint8                *malloc_data;

  /*< private >*/

  gpointer _gst_reserved[GST_PADDING];

};

struct _GstBufferClass {

  GstMiniObjectClass    mini_object_class;

};

#ifdef __SYMBIAN32__

IMPORT_C

#endif

GType       gst_buffer_get_type (void);

/* allocation */

#ifdef __SYMBIAN32__

IMPORT_C

#endif

GstBuffer * gst_buffer_new               (void);

#ifdef __SYMBIAN32__

IMPORT_C

#endif

GstBuffer * gst_buffer_new_and_alloc     (guint size);

#ifdef __SYMBIAN32__

IMPORT_C

#endif

GstBuffer * gst_buffer_try_new_and_alloc (guint size);

/**

 * gst_buffer_set_data:

 * @buf: a #GstBuffer

 * @data: The data (a #guint8 *) to set on the buffer.

 * @size: The size (in bytes, as a #guint) of the data being set.

 *

 * A convenience function to set the data and size on a buffer.

 * This will replace any existing data pointer set on this buffer, but will

 * not change GST_BUFFER_MALLOCDATA(), if any. Callers should ensure that

 * GST_BUFFER_MALLOCDATA() is non-NULL, or should free that and set it to NULL.

 *

 * No checks are done on the data or size arguments passed.

 */

#define		gst_buffer_set_data(buf, data, size)	\

G_STMT_START {						\

  GST_BUFFER_DATA (buf) = data;				\

  GST_BUFFER_SIZE (buf) = size;				\

} G_STMT_END

/* refcounting */

/**

 * gst_buffer_ref:

 * @buf: a #GstBuffer.

 *

 * Increases the refcount of the given buffer by one.

 *

 * Note that the refcount affects the writeability

 * of @buf and its metadata, see gst_buffer_is_writable() and

 * gst_buffer_is_metadata_writable(). It is

 * important to note that keeping additional references to

 * GstBuffer instances can potentially increase the number

 * of memcpy operations in a pipeline.

 *

 * Returns: @buf

 */

#ifdef _FOOL_GTK_DOC_

G_INLINE_FUNC GstBuffer * gst_buffer_ref (GstBuffer * buf);

#endif

static inline GstBuffer *

gst_buffer_ref (GstBuffer * buf)

{

  /* not using a macro here because gcc-4.1 will complain

   * if the return value isn't used (because of the cast) */

  return (GstBuffer *) gst_mini_object_ref (GST_MINI_OBJECT_CAST (buf));

}

/**

 * gst_buffer_unref:

 * @buf: a #GstBuffer.

 *

 * Decreases the refcount of the buffer. If the refcount reaches 0, the buffer

 * will be freed. If GST_BUFFER_MALLOCDATA() is non-NULL, this pointer will

 * also be freed at this time.

 */

#define		gst_buffer_unref(buf)		gst_mini_object_unref (GST_MINI_OBJECT_CAST (buf))

/* copy buffer */

/**

 * gst_buffer_copy:

 * @buf: a #GstBuffer.

 *

 * Create a copy of the given buffer. This will also make a newly allocated

 * copy of the data the source buffer contains.

 */

#define		gst_buffer_copy(buf)		GST_BUFFER_CAST (gst_mini_object_copy (GST_MINI_OBJECT_CAST (buf)))

/**

 * GstBufferCopyFlags:

 * @GST_BUFFER_COPY_FLAGS: flag indicating that buffer flags should be copied

 * @GST_BUFFER_COPY_TIMESTAMPS: flag indicating that buffer timestamp, duration,

 * offset and offset_end should be copied

 * @GST_BUFFER_COPY_CAPS: flag indicating that buffer caps should be copied

 *

 * A set of flags that can be provided to the gst_buffer_copy_metadata()

 * function to specify which metadata fields should be copied.

 *

 * Since: 0.10.13

 */

typedef enum {

  GST_BUFFER_COPY_FLAGS      = (1 << 0),

  GST_BUFFER_COPY_TIMESTAMPS = (1 << 1),

  GST_BUFFER_COPY_CAPS       = (1 << 2)

} GstBufferCopyFlags;

/**

 * GST_BUFFER_COPY_ALL:

 *

 * Combination of all possible fields that can be copied with

 * gst_buffer_copy_metadata().

 *

 * Since: 0.10.13

 */

#define GST_BUFFER_COPY_ALL (GST_BUFFER_COPY_FLAGS | GST_BUFFER_COPY_TIMESTAMPS | GST_BUFFER_COPY_CAPS)

/* copies metadata into newly allocated buffer */

#ifdef __SYMBIAN32__

IMPORT_C

#endif

void            gst_buffer_copy_metadata        (GstBuffer *dest, const GstBuffer *src,

                                                 GstBufferCopyFlags flags);

/**

 * gst_buffer_is_writable:

 * @buf: a #GstBuffer

 *

 * Tests if you can safely write data into a buffer's data array or validly

 * modify the caps and timestamp metadata. Metadata in a GstBuffer is always

 * writable, but it is only safe to change it when there is only one owner

 * of the buffer - ie, the refcount is 1. 

 */

#define		gst_buffer_is_writable(buf)	gst_mini_object_is_writable (GST_MINI_OBJECT_CAST (buf))

/**

 * gst_buffer_make_writable:

 * @buf: a #GstBuffer

 *

 * Makes a writable buffer from the given buffer. If the source buffer is

 * already writable, this will simply return the same buffer. A copy will 

 * otherwise be made using gst_buffer_copy().

 */

#define		gst_buffer_make_writable(buf)   GST_BUFFER_CAST (gst_mini_object_make_writable (GST_MINI_OBJECT_CAST (buf)))

/* Ensure that the metadata of the buffer is writable, even if the buffer data

 * isn't */

#ifdef __SYMBIAN32__

IMPORT_C

#endif

gboolean        gst_buffer_is_metadata_writable (GstBuffer *buf);

#ifdef __SYMBIAN32__

IMPORT_C

#endif

GstBuffer*      gst_buffer_make_metadata_writable (GstBuffer *buf);

/**

 * gst_buffer_replace:

 * @obuf: pointer to a pointer to a #GstBuffer to be replaced.

 * @nbuf: pointer to a #GstBuffer that will replace the buffer pointed to by 

 *        @obuf.

 *

 * Modifies a pointer to a #Gstbuffer to point to a different #GstBuffer. The

 * modification is done atomically (so this is useful for ensuring thread safety

 * in some cases), and the reference counts are updated appropriately (the old 

 * buffer is unreffed, the new is reffed).

 *

 * Either @nbuf or the #GstBuffer pointed to by @obuf may be NULL.

 */

#define		gst_buffer_replace(obuf,nbuf) \

G_STMT_START {						                      \

  GstBuffer **___obufaddr = (GstBuffer **)(obuf);         \

  gst_mini_object_replace ((GstMiniObject **)___obufaddr, \

      GST_MINI_OBJECT_CAST (nbuf));                       \

} G_STMT_END

#ifdef __SYMBIAN32__

IMPORT_C

#endif

GstCaps*	gst_buffer_get_caps		(GstBuffer *buffer);

#ifdef __SYMBIAN32__

IMPORT_C

#endif

void		gst_buffer_set_caps		(GstBuffer *buffer, GstCaps *caps);

/* creating a subbuffer */

#ifdef __SYMBIAN32__

IMPORT_C

#endif

GstBuffer*	gst_buffer_create_sub		(GstBuffer *parent, guint offset, guint size);

/* span, two buffers, intelligently */

#ifdef __SYMBIAN32__

IMPORT_C

#endif

gboolean	gst_buffer_is_span_fast		(GstBuffer *buf1, GstBuffer *buf2);

#ifdef __SYMBIAN32__

IMPORT_C

#endif

GstBuffer*	gst_buffer_span			(GstBuffer *buf1, guint32 offset, GstBuffer *buf2, guint32 len);

/**

 * gst_value_set_buffer:

 * @v: a #GstValue to receive the data

 * @b: a #GstBuffer to assign to the GstValue

 *

 * Sets @b as the value of @v.  Caller retains reference to buffer.

 */

#define		gst_value_set_buffer(v,b)	gst_value_set_mini_object(v, GST_MINI_OBJECT_CAST(b))

/**

 * gst_value_take_buffer:

 * @v: a #GstValue to receive the data

 * @b: a #GstBuffer to assign to the GstValue

 *

 * Sets @b as the value of @v.  Caller gives away reference to buffer.

 */

#define		gst_value_take_buffer(v,b)	gst_value_take_mini_object(v, GST_MINI_OBJECT_CAST(b))

/**

 * gst_value_get_buffer:

 * @v: a #GstValue to qeury

 *

 * Receives a #GstBuffer as the value of @v. Does not return a reference to

 * the buffer, so the pointer is only valid for as long as the caller owns

 * a reference to @v.

 */

#define		gst_value_get_buffer(v)		GST_BUFFER_CAST (gst_value_get_mini_object(v))

G_END_DECLS

#endif /* __GST_BUFFER_H__ */