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217 lines
8.3 KiB
C
217 lines
8.3 KiB
C
/* GStreamer
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* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
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* 2000 Wim Taymans <wtay@chello.be>
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*
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* gstbuffer.h: Header for GstBuffer object
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifndef __GST_BUFFER_H__
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#define __GST_BUFFER_H__
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#include <gst/gstdata.h>
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#include <gst/gstclock.h>
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G_BEGIN_DECLS
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typedef struct _GstBuffer GstBuffer;
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typedef struct _GstBufferPool GstBufferPool;
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#define GST_BUFFER_TRACE_NAME "GstBuffer"
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#define GST_BUFFER_POOL_TRACE_NAME "GstBufferPool"
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extern GType _gst_buffer_type;
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extern GType _gst_buffer_pool_type;
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#define GST_TYPE_BUFFER (_gst_buffer_type)
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#define GST_TYPE_BUFFER_POOL (_gst_buffer_pool_type)
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#define GST_BUFFER(buf) ((GstBuffer *)(buf))
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#define GST_BUFFER_POOL(pool) ((GstBufferPool *)(pool))
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#define GST_IS_BUFFER(buf) (GST_DATA_TYPE(buf) == GST_TYPE_BUFFER)
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#define GST_IS_BUFFER_POOL(buf) (GST_DATA_TYPE(buf) == GST_TYPE_BUFFER_POOL)
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#define GST_BUFFER_REFCOUNT(buf) GST_DATA_REFCOUNT(buf)
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#define GST_BUFFER_REFCOUNT_VALUE(buf) GST_DATA_REFCOUNT_VALUE(buf)
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#define GST_BUFFER_COPY_FUNC(buf) GST_DATA_COPY_FUNC(buf)
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#define GST_BUFFER_FREE_FUNC(buf) GST_DATA_FREE_FUNC(buf)
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#define GST_BUFFER_FLAGS(buf) GST_DATA_FLAGS(buf)
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#define GST_BUFFER_FLAG_IS_SET(buf,flag) GST_DATA_FLAG_IS_SET (buf, flag)
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#define GST_BUFFER_FLAG_SET(buf,flag) GST_DATA_FLAG_SET (buf, flag)
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#define GST_BUFFER_FLAG_UNSET(buf,flag) GST_DATA_FLAG_UNSET (buf, flag)
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#define GST_BUFFER_DATA(buf) (GST_BUFFER(buf)->data)
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#define GST_BUFFER_SIZE(buf) (GST_BUFFER(buf)->size)
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#define GST_BUFFER_MAXSIZE(buf) (GST_BUFFER(buf)->maxsize)
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#define GST_BUFFER_TIMESTAMP(buf) (GST_BUFFER(buf)->timestamp)
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#define GST_BUFFER_DURATION(buf) (GST_BUFFER(buf)->duration)
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#define GST_BUFFER_FORMAT(buf) (GST_BUFFER(buf)->format)
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#define GST_BUFFER_OFFSET(buf) (GST_BUFFER(buf)->offset)
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#define GST_BUFFER_OFFSET_END(buf) (GST_BUFFER(buf)->offset_end)
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#define GST_BUFFER_BUFFERPOOL(buf) (GST_BUFFER(buf)->pool)
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#define GST_BUFFER_POOL_PRIVATE(buf) (GST_BUFFER(buf)->pool_private)
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#define GST_BUFFER_OFFSET_NONE ((guint64)-1)
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#define GST_BUFFER_MAXSIZE_NONE ((guint)0)
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#define GST_BUFFER_DURATION_IS_VALID(buffer) (GST_CLOCK_TIME_IS_VALID (GST_BUFFER_DURATION (buffer)))
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#define GST_BUFFER_TIMESTAMP_IS_VALID(buffer) (GST_CLOCK_TIME_IS_VALID (GST_BUFFER_TIMESTAMP (buffer)))
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#define GST_BUFFER_OFFSET_IS_VALID(buffer) (GST_BUFFER_OFFSET (buffer) != GST_BUFFER_OFFSET_NONE)
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#define GST_BUFFER_OFFSET_END_IS_VALID(buffer) (GST_BUFFER_OFFSET_END (buffer) != GST_BUFFER_OFFSET_NONE)
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#define GST_BUFFER_MAXSIZE_IS_VALID(buffer) (GST_BUFFER_MAXSIZE (buffer) != GST_BUFFER_MAXSIZE_NONE)
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typedef enum {
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GST_BUFFER_READONLY = GST_DATA_READONLY,
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GST_BUFFER_SUBBUFFER = GST_DATA_FLAG_LAST,
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GST_BUFFER_ORIGINAL,
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GST_BUFFER_DONTFREE,
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GST_BUFFER_DISCONTINUOUS,
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GST_BUFFER_KEY_UNIT,
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GST_BUFFER_PREROLL,
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GST_BUFFER_FLAG_LAST = GST_DATA_FLAG_LAST + 8
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} GstBufferFlag;
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struct _GstBuffer {
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GstData data_type;
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/* pointer to data and its size */
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guint8 *data; /* pointer to buffer data */
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guint size; /* size of buffer data */
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guint maxsize; /* max size of this buffer */
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/* timestamp */
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GstClockTime timestamp;
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GstClockTime duration;
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/* media specific offset
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* for video frames, this could be the number of frames,
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* for audio data, this could be the number of audio samples,
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* for file data or compressed data, this could be the number of bytes
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* offset_end is the last offset contained in the buffer. The format specifies
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* the meaning of both of them exactly.
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*/
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guint64 offset;
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guint64 offset_end;
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/* this is a pointer to the buffer pool (if any) */
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GstBufferPool *pool;
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/* pointer to pool private data of parent buffer in case of a subbuffer */
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gpointer pool_private;
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GST_STRUCT_PADDING
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};
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/* bufferpools */
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typedef GstBuffer* (*GstBufferPoolBufferNewFunction) (GstBufferPool *pool, guint64 offset,
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guint size, gpointer user_data);
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typedef GstBuffer* (*GstBufferPoolBufferCopyFunction) (GstBufferPool *pool,
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const GstBuffer *buffer,
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gpointer user_data);
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typedef void (*GstBufferPoolBufferFreeFunction) (GstBufferPool *pool,
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GstBuffer *buffer,
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gpointer user_data);
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struct _GstBufferPool {
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GstData data;
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gboolean active;
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GstBufferPoolBufferNewFunction buffer_new;
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GstBufferPoolBufferCopyFunction buffer_copy;
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GstBufferPoolBufferFreeFunction buffer_free;
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gpointer user_data;
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GST_STRUCT_PADDING
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};
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/* allocation */
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GType gst_buffer_get_type (void);
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GstBuffer* gst_buffer_new (void);
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GstBuffer* gst_buffer_new_and_alloc (guint size);
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/* creating a new buffer from a pool */
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GstBuffer* gst_buffer_new_from_pool (GstBufferPool *pool,
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guint64 offset, guint size);
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#define gst_buffer_set_data(buf, data, size) \
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G_STMT_START { \
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GST_BUFFER_DATA (buf) = data; \
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GST_BUFFER_SIZE (buf) = size; \
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} G_STMT_END
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/* refcounting */
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#define gst_buffer_ref(buf) GST_BUFFER (gst_data_ref (GST_DATA (buf)))
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#define gst_buffer_ref_by_count(buf,c) GST_BUFFER (gst_data_ref_by_count (GST_DATA (buf), c))
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#define gst_buffer_unref(buf) gst_data_unref (GST_DATA (buf))
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/* copy buffer */
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#define gst_buffer_copy(buf) GST_BUFFER (gst_data_copy (GST_DATA (buf)))
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#define gst_buffer_is_writable(buf) gst_data_is_writable (GST_DATA (buf))
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#define gst_buffer_copy_on_write(buf) GST_BUFFER (gst_data_copy_on_write (GST_DATA (buf)))
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#define gst_buffer_free(buf) gst_data_free (GST_DATA (buf))
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/* creating a subbuffer */
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GstBuffer* gst_buffer_create_sub (GstBuffer *parent, guint offset, guint size);
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/* merge, span, or append two buffers, intelligently */
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GstBuffer* gst_buffer_merge (GstBuffer *buf1, GstBuffer *buf2);
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gboolean gst_buffer_is_span_fast (GstBuffer *buf1, GstBuffer *buf2);
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GstBuffer* gst_buffer_span (GstBuffer *buf1, guint32 offset, GstBuffer *buf2, guint32 len);
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/* --- private --- */
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void _gst_buffer_initialize (void);
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/* functions used by subclasses and bufferpools */
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void gst_buffer_default_free (GstBuffer *buffer);
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GstBuffer* gst_buffer_default_copy (GstBuffer *buffer);
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/* creating a new buffer pools */
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GType gst_buffer_pool_get_type (void);
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GstBufferPool* gst_buffer_pool_new (GstDataFreeFunction free,
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GstDataCopyFunction copy,
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GstBufferPoolBufferNewFunction buffer_new,
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GstBufferPoolBufferCopyFunction buffer_copy,
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GstBufferPoolBufferFreeFunction buffer_free,
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gpointer user_data);
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/* function used by subclasses and bufferpools */
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void gst_buffer_pool_default_free (GstBufferPool *pool);
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/* check if pool is usable */
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gboolean gst_buffer_pool_is_active (GstBufferPool *pool);
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void gst_buffer_pool_set_active (GstBufferPool *pool, gboolean active);
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#define gst_buffer_pool_ref(pool) GST_BUFFER_POOL (gst_data_ref (GST_DATA (pool)))
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#define gst_buffer_pool_ref_by_count(pool,c) GST_BUFFER_POOL (gst_data_ref_by_count (GST_DATA (pool), c))
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#define gst_buffer_pool_unref(pool) gst_data_unref (GST_DATA (pool))
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/* bufferpool operations */
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#define gst_buffer_pool_copy(pool) GST_BUFFER_POOL (gst_data_copy (GST_DATA (pool)))
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#define gst_buffer_pool_is_writable(pool) GST_BUFFER_POOL (gst_data_is_writable (GST_DATA (pool)))
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#define gst_buffer_pool_copy_on_write(pool) GST_BUFFER_POOL (gst_data_copy_on_write (GST_DATA (pool)))
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#define gst_buffer_pool_free(pool) gst_data_free (GST_DATA (pool))
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void gst_buffer_pool_set_user_data (GstBufferPool *pool, gpointer user_data);
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gpointer gst_buffer_pool_get_user_data (GstBufferPool *pool);
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G_END_DECLS
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#endif /* __GST_BUFFER_H__ */
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