--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gstreamer_core/gst/gstbuffer.h	Thu Dec 17 08:53:32 2009 +0200
@@ -0,0 +1,508 @@
+/* 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__ */