/**
* SECTION:gstbuffer
+ * @title: GstBuffer
* @short_description: Data-passing buffer type
* @see_also: #GstPad, #GstMiniObject, #GstMemory, #GstMeta, #GstBufferPool
*
* created one will typically allocate memory for it and add it to the buffer.
* The following example creates a buffer that can hold a given video frame
* with a given width, height and bits per plane.
- * |[
+ *
+ * ``` C
* GstBuffer *buffer;
* GstMemory *memory;
* gint size, width, height, bpp;
* memory = gst_allocator_alloc (NULL, size, NULL);
* gst_buffer_insert_memory (buffer, -1, memory);
* ...
- * ]|
+ * ```
*
* Alternatively, use gst_buffer_new_allocate() to create a buffer with
* preallocated data of a given size.
*
* If a plug-in wants to modify the buffer data or metadata in-place, it should
* first obtain a buffer that is safe to modify by using
- * gst_buffer_make_writable(). This function is optimized so that a copy will
+ * gst_buffer_make_writable(). This function is optimized so that a copy will
* only be made when it is necessary.
*
* Several flags of the buffer can be set and unset with the
* needed.
*
* Arbitrary extra metadata can be set on a buffer with gst_buffer_add_meta().
- * Metadata can be retrieved with gst_buffer_get_meta(). See also #GstMeta
+ * Metadata can be retrieved with gst_buffer_get_meta(). See also #GstMeta.
*
* An element should either unref the buffer or push it out on a src pad
* using gst_pad_push() (see #GstPad).
* Typically, #GstParentBufferMeta is used when the child buffer is directly
* using the #GstMemory of the parent buffer, and wants to prevent the parent
* buffer from being returned to a buffer pool until the #GstMemory is available
- * for re-use. (Since 1.6)
- *
+ * for re-use. (Since: 1.6)
*/
+
+#define GST_DISABLE_MINIOBJECT_INLINE_FUNCTIONS
#include "gst_private.h"
#ifdef HAVE_UNISTD_H
#include "gstutils.h"
#include "gstversion.h"
-GType _gst_buffer_type = 0;
+/* For g_memdup2 */
+#include "glib-compat-private.h"
-typedef struct _GstMetaItem GstMetaItem;
+GType _gst_buffer_type = 0;
-struct _GstMetaItem
-{
- GstMetaItem *next;
- GstMeta meta;
-};
-#define ITEM_SIZE(info) ((info)->size + sizeof (GstMetaItem))
+/* info->size will be sizeof(FooMeta) which contains a GstMeta at the beginning
+ * too, and then there is again a GstMeta in GstMetaItem, so subtract one. */
+#define ITEM_SIZE(info) ((info)->size + sizeof (GstMetaItem) - sizeof (GstMeta))
#define GST_BUFFER_MEM_MAX 16
#define GST_BUFFER_MEM_PTR(b,i) (((GstBufferImpl *)(b))->mem[i])
#define GST_BUFFER_BUFMEM(b) (((GstBufferImpl *)(b))->bufmem)
#define GST_BUFFER_META(b) (((GstBufferImpl *)(b))->item)
+#define GST_BUFFER_TAIL_META(b) (((GstBufferImpl *)(b))->tail_item)
typedef struct
{
/* FIXME, make metadata allocation more efficient by using part of the
* GstBufferImpl */
GstMetaItem *item;
+ GstMetaItem *tail_item;
} GstBufferImpl;
+static gint64 meta_seq; /* 0 *//* ATOMIC */
+
+/* TODO: use GLib's once https://gitlab.gnome.org/GNOME/glib/issues/1076 lands */
+#if defined(__GCC_HAVE_SYNC_COMPARE_AND_SWAP_8)
+static inline gint64
+gst_atomic_int64_inc (gint64 * atomic)
+{
+ return __sync_fetch_and_add (atomic, 1);
+}
+#elif defined (G_PLATFORM_WIN32)
+#include <windows.h>
+static inline gint64
+gst_atomic_int64_inc (gint64 * atomic)
+{
+ return InterlockedExchangeAdd64 (atomic, 1);
+}
+#else
+#define STR_TOKEN(s) #s
+#define STR(s) STR_TOKEN(s)
+#pragma message "No 64-bit atomic int defined for this " STR(TARGET_CPU) " platform/toolchain!"
+
+#define NO_64BIT_ATOMIC_INT_FOR_PLATFORM
+G_LOCK_DEFINE_STATIC (meta_seq);
+static inline gint64
+gst_atomic_int64_inc (gint64 * atomic)
+{
+ gint64 ret;
+
+ G_LOCK (meta_seq);
+ ret = (*atomic)++;
+ G_UNLOCK (meta_seq);
+
+ return ret;
+}
+#endif
static gboolean
_is_span (GstMemory ** mem, gsize len, gsize * poffset, GstMemory ** parent)
}
static GstMemory *
-_get_merged_memory (GstBuffer * buffer, guint idx, guint length)
+_actual_merged_memory (GstBuffer * buffer, guint idx, guint length)
{
GstMemory **mem, *result = NULL;
-
- GST_CAT_LOG (GST_CAT_BUFFER, "buffer %p, idx %u, length %u", buffer, idx,
- length);
+ GstMemory *parent = NULL;
+ gsize size, poffset = 0;
mem = GST_BUFFER_MEM_ARRAY (buffer);
- if (G_UNLIKELY (length == 0)) {
- result = NULL;
- } else if (G_LIKELY (length == 1)) {
- result = gst_memory_ref (mem[idx]);
- } else {
- GstMemory *parent = NULL;
- gsize size, poffset = 0;
+ size = gst_buffer_get_sizes_range (buffer, idx, length, NULL, NULL);
- size = gst_buffer_get_sizes_range (buffer, idx, length, NULL, NULL);
-
- if (G_UNLIKELY (_is_span (mem + idx, length, &poffset, &parent))) {
- if (!GST_MEMORY_IS_NO_SHARE (parent))
- result = gst_memory_share (parent, poffset, size);
- if (!result) {
- GST_CAT_DEBUG (GST_CAT_PERFORMANCE, "copy for merge %p", parent);
- result = gst_memory_copy (parent, poffset, size);
- }
- } else {
- gsize i, tocopy, left;
- GstMapInfo sinfo, dinfo;
- guint8 *ptr;
-
- result = gst_allocator_alloc (NULL, size, NULL);
- gst_memory_map (result, &dinfo, GST_MAP_WRITE);
+ if (G_UNLIKELY (_is_span (mem + idx, length, &poffset, &parent))) {
+ if (!GST_MEMORY_IS_NO_SHARE (parent))
+ result = gst_memory_share (parent, poffset, size);
+ if (!result) {
+ GST_CAT_DEBUG (GST_CAT_PERFORMANCE, "copy for merge %p", parent);
+ result = gst_memory_copy (parent, poffset, size);
+ }
+ } else {
+ gsize i, tocopy, left;
+ GstMapInfo sinfo, dinfo;
+ guint8 *ptr;
+
+ result = gst_allocator_alloc (NULL, size, NULL);
+ if (result == NULL || !gst_memory_map (result, &dinfo, GST_MAP_WRITE)) {
+ GST_CAT_ERROR (GST_CAT_BUFFER, "Failed to map memory writable");
+ if (result)
+ gst_memory_unref (result);
+ return NULL;
+ }
- ptr = dinfo.data;
- left = size;
+ ptr = dinfo.data;
+ left = size;
- for (i = idx; i < (idx + length) && left > 0; i++) {
- gst_memory_map (mem[i], &sinfo, GST_MAP_READ);
- tocopy = MIN (sinfo.size, left);
- GST_CAT_DEBUG (GST_CAT_PERFORMANCE,
- "memcpy %" G_GSIZE_FORMAT " bytes for merge %p from memory %p",
- tocopy, result, mem[i]);
- memcpy (ptr, (guint8 *) sinfo.data, tocopy);
- left -= tocopy;
- ptr += tocopy;
- gst_memory_unmap (mem[i], &sinfo);
+ for (i = idx; i < (idx + length) && left > 0; i++) {
+ if (!gst_memory_map (mem[i], &sinfo, GST_MAP_READ)) {
+ GST_CAT_ERROR (GST_CAT_BUFFER,
+ "buffer %p, idx %u, length %u failed to map readable", buffer,
+ idx, length);
+ gst_memory_unmap (result, &dinfo);
+ gst_memory_unref (result);
+ return NULL;
}
- gst_memory_unmap (result, &dinfo);
+ tocopy = MIN (sinfo.size, left);
+ GST_CAT_DEBUG (GST_CAT_PERFORMANCE,
+ "memcpy %" G_GSIZE_FORMAT " bytes for merge %p from memory %p",
+ tocopy, result, mem[i]);
+ memcpy (ptr, (guint8 *) sinfo.data, tocopy);
+ left -= tocopy;
+ ptr += tocopy;
+ gst_memory_unmap (mem[i], &sinfo);
}
+ gst_memory_unmap (result, &dinfo);
}
+
return result;
}
+static inline GstMemory *
+_get_merged_memory (GstBuffer * buffer, guint idx, guint length)
+{
+ GST_CAT_LOG (GST_CAT_BUFFER, "buffer %p, idx %u, length %u", buffer, idx,
+ length);
+
+ if (G_UNLIKELY (length == 0))
+ return NULL;
+
+ if (G_LIKELY (length == 1))
+ return gst_memory_ref (GST_BUFFER_MEM_PTR (buffer, idx));
+
+ return _actual_merged_memory (buffer, idx, length);
+}
+
+
static void
_replace_memory (GstBuffer * buffer, guint len, guint idx, guint length,
GstMemory * mem)
GstMemory *old = GST_BUFFER_MEM_PTR (buffer, i);
gst_memory_unlock (old, GST_LOCK_FLAG_EXCLUSIVE);
+ gst_mini_object_remove_parent (GST_MINI_OBJECT_CAST (old),
+ GST_MINI_OBJECT_CAST (buffer));
gst_memory_unref (old);
}
if (mem != NULL) {
/* replace with single memory */
+ gst_mini_object_add_parent (GST_MINI_OBJECT_CAST (mem),
+ GST_MINI_OBJECT_CAST (buffer));
gst_memory_lock (mem, GST_LOCK_FLAG_EXCLUSIVE);
GST_BUFFER_MEM_PTR (buffer, idx) = mem;
idx++;
GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_TAG_MEMORY);
}
+/**
+ * gst_buffer_get_flags:
+ * @buffer: a #GstBuffer
+ *
+ * Gets the #GstBufferFlags flags set on this buffer.
+ *
+ * Returns: the flags set on this buffer.
+ *
+ * Since: 1.10
+ */
+GstBufferFlags
+gst_buffer_get_flags (GstBuffer * buffer)
+{
+ return (GstBufferFlags) GST_BUFFER_FLAGS (buffer);
+}
+
+/**
+ * gst_buffer_has_flags:
+ * @buffer: a #GstBuffer
+ * @flags: the #GstBufferFlags flag to check.
+ *
+ * Gives the status of a specific flag on a buffer.
+ *
+ * Returns: %TRUE if all flags in @flags are found on @buffer.
+ *
+ * Since: 1.10
+ */
+gboolean
+gst_buffer_has_flags (GstBuffer * buffer, GstBufferFlags flags)
+{
+ return GST_BUFFER_FLAG_IS_SET (buffer, flags);
+}
+
+/**
+ * gst_buffer_set_flags:
+ * @buffer: a #GstBuffer
+ * @flags: the #GstBufferFlags to set.
+ *
+ * Sets one or more buffer flags on a buffer.
+ *
+ * Returns: %TRUE if @flags were successfully set on buffer.
+ *
+ * Since: 1.10
+ */
+gboolean
+gst_buffer_set_flags (GstBuffer * buffer, GstBufferFlags flags)
+{
+ GST_BUFFER_FLAG_SET (buffer, flags);
+ return TRUE;
+}
+
+/**
+ * gst_buffer_unset_flags:
+ * @buffer: a #GstBuffer
+ * @flags: the #GstBufferFlags to clear
+ *
+ * Clears one or more buffer flags.
+ *
+ * Returns: true if @flags is successfully cleared from buffer.
+ *
+ * Since: 1.10
+ */
+gboolean
+gst_buffer_unset_flags (GstBuffer * buffer, GstBufferFlags flags)
+{
+ GST_BUFFER_FLAG_UNSET (buffer, flags);
+ return TRUE;
+}
+
+
+
/* transfer full for return and transfer none for @mem */
static inline GstMemory *
_memory_get_exclusive_reference (GstMemory * mem)
/* and insert the new buffer */
GST_BUFFER_MEM_PTR (buffer, idx) = mem;
GST_BUFFER_MEM_LEN (buffer) = len + 1;
+ gst_mini_object_add_parent (GST_MINI_OBJECT_CAST (mem),
+ GST_MINI_OBJECT_CAST (buffer));
GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_TAG_MEMORY);
}
_priv_gst_buffer_initialize (void)
{
_gst_buffer_type = gst_buffer_get_type ();
+
+#ifdef NO_64BIT_ATOMIC_INT_FOR_PLATFORM
+ GST_CAT_WARNING (GST_CAT_PERFORMANCE,
+ "No 64-bit atomic int defined for this platform/toolchain!");
+#endif
}
/**
* gst_buffer_get_max_memory:
*
- * Get the maximum amount of memory blocks that a buffer can hold. This is a
+ * Gets the maximum amount of memory blocks that a buffer can hold. This is a
* compile time constant that can be queried with the function.
*
* When more memory blocks are added, existing memory blocks will be merged
for (i = 0; i < len && left > 0; i++) {
GstMemory *mem = GST_BUFFER_MEM_PTR (src, i);
- bsize = gst_memory_get_sizes (mem, NULL, NULL);
+ bsize = mem->size;
if (bsize <= skip) {
/* don't copy buffer */
* gst_buffer_copy_deep:
* @buf: a #GstBuffer.
*
- * Create a copy of the given buffer. This will make a newly allocated
+ * Creates a copy of the given buffer. This will make a newly allocated
* copy of the data the source buffer contains.
*
* Returns: (transfer full): a new copy of @buf.
len = GST_BUFFER_MEM_LEN (buffer);
for (i = 0; i < len; i++) {
gst_memory_unlock (GST_BUFFER_MEM_PTR (buffer, i), GST_LOCK_FLAG_EXCLUSIVE);
+ gst_mini_object_remove_parent (GST_MINI_OBJECT_CAST (GST_BUFFER_MEM_PTR
+ (buffer, i)), GST_MINI_OBJECT_CAST (buffer));
gst_memory_unref (GST_BUFFER_MEM_PTR (buffer, i));
}
*
* Creates a newly allocated buffer without any data.
*
- * MT safe.
- *
* Returns: (transfer full): the new #GstBuffer.
*/
GstBuffer *
*
* Note that when @size == 0, the buffer will not have memory associated with it.
*
- * MT safe.
- *
- * Returns: (transfer full) (nullable): a new #GstBuffer, or %NULL if
- * the memory couldn't be allocated.
+ * Returns: (transfer full) (nullable): a new #GstBuffer
*/
GstBuffer *
gst_buffer_new_allocate (GstAllocator * allocator, gsize size,
* @user_data: (allow-none): user_data
* @notify: (allow-none) (scope async) (closure user_data): called with @user_data when the memory is freed
*
- * Allocate a new buffer that wraps the given memory. @data must point to
+ * Allocates a new buffer that wraps the given memory. @data must point to
* @maxsize of memory, the wrapped buffer will have the region from @offset and
* @size visible.
*
* @size: allocated size of @data
*
* Creates a new buffer that wraps the given @data. The memory will be freed
- * with g_free and will be marked writable.
- *
- * MT safe.
+ * with g_free() and will be marked writable.
*
* Returns: (transfer full): a new #GstBuffer
*/
}
/**
+ * gst_buffer_new_wrapped_bytes:
+ * @bytes: (transfer none): a #GBytes to wrap
+ *
+ * Creates a new #GstBuffer that wraps the given @bytes. The data inside
+ * @bytes cannot be %NULL and the resulting buffer will be marked as read only.
+ *
+ * Returns: (transfer full): a new #GstBuffer wrapping @bytes
+ *
+ * Since: 1.16
+ */
+GstBuffer *
+gst_buffer_new_wrapped_bytes (GBytes * bytes)
+{
+ guint8 *bytes_data;
+ gsize size;
+
+ g_return_val_if_fail (bytes != NULL, NULL);
+ bytes_data = (guint8 *) g_bytes_get_data (bytes, &size);
+ g_return_val_if_fail (bytes_data != NULL, NULL);
+
+ return gst_buffer_new_wrapped_full (GST_MEMORY_FLAG_READONLY, bytes_data,
+ size, 0, size, g_bytes_ref (bytes), (GDestroyNotify) g_bytes_unref);
+}
+
+/**
+ * gst_buffer_new_memdup:
+ * @data: (array length=size) (element-type guint8) (transfer none): data to copy into new buffer
+ * @size: size of @data in bytes
+ *
+ * Creates a new buffer of size @size and fills it with a copy of @data.
+ *
+ * Returns: (transfer full): a new #GstBuffer
+ *
+ * Since: 1.20
+ */
+GstBuffer *
+gst_buffer_new_memdup (gconstpointer data, gsize size)
+{
+ gpointer data2 = g_memdup2 (data, size);
+
+ return gst_buffer_new_wrapped_full (0, data2, size, 0, size, data2, g_free);
+}
+
+/**
* gst_buffer_n_memory:
* @buffer: a #GstBuffer.
*
- * Get the amount of memory blocks that this buffer has. This amount is never
+ * Gets the amount of memory blocks that this buffer has. This amount is never
* larger than what gst_buffer_get_max_memory() returns.
*
- * Returns: (transfer full): the amount of memory block in this buffer.
+ * Returns: the number of memory blocks this buffer is made of.
*/
guint
gst_buffer_n_memory (GstBuffer * buffer)
* @buffer: a #GstBuffer.
* @mem: (transfer full): a #GstMemory.
*
- * Prepend the memory block @mem to @buffer. This function takes
+ * Prepends the memory block @mem to @buffer. This function takes
* ownership of @mem and thus doesn't increase its refcount.
*
* This function is identical to gst_buffer_insert_memory() with an index of 0.
* @buffer: a #GstBuffer.
* @mem: (transfer full): a #GstMemory.
*
- * Append the memory block @mem to @buffer. This function takes
+ * Appends the memory block @mem to @buffer. This function takes
* ownership of @mem and thus doesn't increase its refcount.
*
* This function is identical to gst_buffer_insert_memory() with an index of -1.
* @idx: the index to add the memory at, or -1 to append it to the end
* @mem: (transfer full): a #GstMemory.
*
- * Insert the memory block @mem to @buffer at @idx. This function takes ownership
+ * Inserts the memory block @mem into @buffer at @idx. This function takes ownership
* of @mem and thus doesn't increase its refcount.
*
* Only gst_buffer_get_max_memory() can be added to a buffer. If more memory is
if (mapped != mem) {
/* memory changed, lock new memory */
+ gst_mini_object_add_parent (GST_MINI_OBJECT_CAST (mapped),
+ GST_MINI_OBJECT_CAST (buffer));
gst_memory_lock (mapped, GST_LOCK_FLAG_EXCLUSIVE);
GST_BUFFER_MEM_PTR (buffer, idx) = mapped;
/* unlock old memory */
gst_memory_unlock (mem, GST_LOCK_FLAG_EXCLUSIVE);
+ gst_mini_object_remove_parent (GST_MINI_OBJECT_CAST (mem),
+ GST_MINI_OBJECT_CAST (buffer));
GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_TAG_MEMORY);
}
gst_memory_unref (mem);
* @buffer: a #GstBuffer.
* @idx: an index
*
- * Get the memory block at @idx in @buffer. The memory block stays valid until
+ * Gets the memory block at @idx in @buffer. The memory block stays valid until
* the memory block in @buffer is removed, replaced or merged, typically with
* any call that modifies the memory in @buffer.
*
- * Returns: (transfer none): the #GstMemory at @idx.
+ * Returns: (transfer none) (nullable): the #GstMemory at @idx.
*/
GstMemory *
gst_buffer_peek_memory (GstBuffer * buffer, guint idx)
{
- guint len;
-
g_return_val_if_fail (GST_IS_BUFFER (buffer), NULL);
- len = GST_BUFFER_MEM_LEN (buffer);
- g_return_val_if_fail (idx < len, NULL);
+ g_return_val_if_fail (idx < GST_BUFFER_MEM_LEN (buffer), NULL);
return GST_BUFFER_MEM_PTR (buffer, idx);
}
* @buffer: a #GstBuffer.
* @idx: an index
*
- * Get the memory block at index @idx in @buffer.
+ * Gets the memory block at index @idx in @buffer.
*
- * Returns: (transfer full): a #GstMemory that contains the data of the
- * memory block at @idx. Use gst_memory_unref () after usage.
+ * Returns: (transfer full) (nullable): a #GstMemory that contains the data of the
+ * memory block at @idx.
*/
GstMemory *
gst_buffer_get_memory (GstBuffer * buffer, guint idx)
* gst_buffer_get_all_memory:
* @buffer: a #GstBuffer.
*
- * Get all the memory block in @buffer. The memory blocks will be merged
+ * Gets all the memory blocks in @buffer. The memory blocks will be merged
* into one large #GstMemory.
*
- * Returns: (transfer full): a #GstMemory that contains the merged memory.
- * Use gst_memory_unref () after usage.
+ * Returns: (transfer full) (nullable): a #GstMemory that contains the merged memory.
*/
GstMemory *
gst_buffer_get_all_memory (GstBuffer * buffer)
* @idx: an index
* @length: a length
*
- * Get @length memory blocks in @buffer starting at @idx. The memory blocks will
+ * Gets @length memory blocks in @buffer starting at @idx. The memory blocks will
* be merged into one large #GstMemory.
*
* If @length is -1, all memory starting from @idx is merged.
*
- * Returns: (transfer full): a #GstMemory that contains the merged data of @length
- * blocks starting at @idx. Use gst_memory_unref () after usage.
+ * Returns: (transfer full) (nullable): a #GstMemory that contains the merged data of @length
+ * blocks starting at @idx.
*/
GstMemory *
gst_buffer_get_memory_range (GstBuffer * buffer, guint idx, gint length)
* gst_buffer_replace_memory_range:
* @buffer: a #GstBuffer.
* @idx: an index
- * @length: a length should not be 0
+ * @length: a length, should not be 0
* @mem: (transfer full): a #GstMemory
*
* Replaces @length memory blocks in @buffer starting at @idx with @mem.
* @buffer: a #GstBuffer.
* @idx: an index
*
- * Remove the memory block in @b at index @i.
+ * Removes the memory block in @b at index @i.
*/
void
gst_buffer_remove_memory (GstBuffer * buffer, guint idx)
* gst_buffer_remove_all_memory:
* @buffer: a #GstBuffer.
*
- * Remove all the memory blocks in @buffer.
+ * Removes all the memory blocks in @buffer.
*/
void
gst_buffer_remove_all_memory (GstBuffer * buffer)
{
- gst_buffer_remove_memory_range (buffer, 0, -1);
+ if (GST_BUFFER_MEM_LEN (buffer))
+ gst_buffer_remove_memory_range (buffer, 0, -1);
}
/**
* @idx: an index
* @length: a length
*
- * Remove @length memory blocks in @buffer starting from @idx.
+ * Removes @length memory blocks in @buffer starting from @idx.
*
* @length can be -1, in which case all memory starting from @idx is removed.
*/
* @length: (out): pointer to length
* @skip: (out): pointer to skip
*
- * Find the memory blocks that span @size bytes starting from @offset
+ * Finds the memory blocks that span @size bytes starting from @offset
* in @buffer.
*
* When this function returns %TRUE, @idx will contain the index of the first
gsize s;
mem = GST_BUFFER_MEM_PTR (buffer, i);
- s = gst_memory_get_sizes (mem, NULL, NULL);
+ s = mem->size;
if (s <= offset) {
/* block before offset, or empty block, skip */
* gst_buffer_is_memory_range_writable:
* @buffer: a #GstBuffer.
* @idx: an index
- * @length: a length should not be 0
+ * @length: a length, should not be 0
*
- * Check if @length memory blocks in @buffer starting from @idx are writable.
+ * Checks if @length memory blocks in @buffer starting from @idx are writable.
*
* @length can be -1 to check all the memory blocks after @idx.
*
* gst_buffer_is_all_memory_writable:
* @buffer: a #GstBuffer.
*
- * Check if all memory blocks in @buffer are writable.
+ * Checks if all memory blocks in @buffer are writable.
*
* Note that this function does not check if @buffer is writable, use
* gst_buffer_is_writable() to check that if needed.
* @offset: (out) (allow-none): a pointer to the offset
* @maxsize: (out) (allow-none): a pointer to the maxsize
*
- * Get the total size of the memory blocks in @b.
+ * Gets the total size of the memory blocks in @buffer.
*
* When not %NULL, @offset will contain the offset of the data in the
* first memory block in @buffer and @maxsize will contain the sum of
* gst_buffer_get_size:
* @buffer: a #GstBuffer.
*
- * Get the total size of the memory blocks in @buffer.
+ * Gets the total size of the memory blocks in @buffer.
*
* Returns: total size of the memory blocks in @buffer.
*/
gsize
gst_buffer_get_size (GstBuffer * buffer)
{
- return gst_buffer_get_sizes_range (buffer, 0, -1, NULL, NULL);
+ guint i;
+ gsize size, len;
+
+ g_return_val_if_fail (GST_IS_BUFFER (buffer), 0);
+
+ /* FAST PATH */
+ len = GST_BUFFER_MEM_LEN (buffer);
+ for (i = 0, size = 0; i < len; i++)
+ size += GST_BUFFER_MEM_PTR (buffer, i)->size;
+ return size;
}
/**
* @offset: (out) (allow-none): a pointer to the offset
* @maxsize: (out) (allow-none): a pointer to the maxsize
*
- * Get the total size of @length memory blocks stating from @idx in @buffer.
+ * Gets the total size of @length memory blocks stating from @idx in @buffer.
*
* When not %NULL, @offset will contain the offset of the data in the
* memory block in @buffer at @idx and @maxsize will contain the sum of the size
/* common case */
mem = GST_BUFFER_MEM_PTR (buffer, idx);
size = gst_memory_get_sizes (mem, offset, maxsize);
+ } else if (offset == NULL && maxsize == NULL) {
+ /* FAST PATH ! */
+ guint i, end;
+
+ size = 0;
+ end = idx + length;
+ for (i = idx; i < end; i++) {
+ mem = GST_BUFFER_MEM_PTR (buffer, i);
+ size += mem->size;
+ }
} else {
guint i, end;
gsize extra, offs;
* @offset: the offset adjustment
* @size: the new size or -1 to just adjust the offset
*
- * Set the offset and total size of the memory blocks in @buffer.
+ * Sets the offset and total size of the memory blocks in @buffer.
*/
void
gst_buffer_resize (GstBuffer * buffer, gssize offset, gssize size)
* @buffer: a #GstBuffer.
* @size: the new size
*
- * Set the total size of the memory blocks in @buffer.
+ * Sets the total size of the memory blocks in @buffer.
*/
void
gst_buffer_set_size (GstBuffer * buffer, gssize size)
* @offset: the offset adjustment
* @size: the new size or -1 to just adjust the offset
*
- * Set the total size of the @length memory blocks starting at @idx in
+ * Sets the total size of the @length memory blocks starting at @idx in
* @buffer
*
* Returns: %TRUE if resizing succeeded, %FALSE otherwise.
gsize left, noffs;
mem = GST_BUFFER_MEM_PTR (buffer, i);
- bsize = gst_memory_get_sizes (mem, NULL, NULL);
+ bsize = mem->size;
noffs = 0;
/* last buffer always gets resized to the remaining size */
if (newmem == NULL)
return FALSE;
+ gst_mini_object_add_parent (GST_MINI_OBJECT_CAST (newmem),
+ GST_MINI_OBJECT_CAST (buffer));
gst_memory_lock (newmem, GST_LOCK_FLAG_EXCLUSIVE);
GST_BUFFER_MEM_PTR (buffer, i) = newmem;
gst_memory_unlock (mem, GST_LOCK_FLAG_EXCLUSIVE);
+ gst_mini_object_remove_parent (GST_MINI_OBJECT_CAST (mem),
+ GST_MINI_OBJECT_CAST (buffer));
gst_memory_unref (mem);
GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_TAG_MEMORY);
/**
* gst_buffer_map:
* @buffer: a #GstBuffer.
- * @info: (out): info about the mapping
+ * @info: (out caller-allocates): info about the mapping
* @flags: flags for the mapping
*
- * This function fills @info with the #GstMapInfo of all merged memory
- * blocks in @buffer.
+ * Fills @info with the #GstMapInfo of all merged memory blocks in @buffer.
*
* @flags describe the desired access of the memory. When @flags is
* #GST_MAP_WRITE, @buffer should be writable (as returned from
* @buffer: a #GstBuffer.
* @idx: an index
* @length: a length
- * @info: (out): info about the mapping
+ * @info: (out caller-allocates): info about the mapping
* @flags: flags for the mapping
*
- * This function fills @info with the #GstMapInfo of @length merged memory blocks
+ * Fills @info with the #GstMapInfo of @length merged memory blocks
* starting at @idx in @buffer. When @length is -1, all memory blocks starting
* from @idx are merged and mapped.
*
/* ERROR */
not_writable:
{
- GST_WARNING_OBJECT (buffer, "write map requested on non-writable buffer");
+ GST_WARNING ("write map requested on non-writable buffer");
g_critical ("write map requested on non-writable buffer");
memset (info, 0, sizeof (GstMapInfo));
return FALSE;
no_memory:
{
/* empty buffer, we need to return NULL */
- GST_DEBUG_OBJECT (buffer, "can't get buffer memory");
+ GST_DEBUG ("can't get buffer memory");
memset (info, 0, sizeof (GstMapInfo));
return TRUE;
}
cannot_map:
{
- GST_DEBUG_OBJECT (buffer, "cannot map memory");
+ GST_DEBUG ("cannot map memory");
memset (info, 0, sizeof (GstMapInfo));
return FALSE;
}
* @buffer: a #GstBuffer.
* @info: a #GstMapInfo
*
- * Release the memory previously mapped with gst_buffer_map().
+ * Releases the memory previously mapped with gst_buffer_map().
*/
void
gst_buffer_unmap (GstBuffer * buffer, GstMapInfo * info)
* @src: (array length=size) (element-type guint8): the source address
* @size: the size to fill
*
- * Copy @size bytes from @src to @buffer at @offset.
+ * Copies @size bytes from @src to @buffer at @offset.
*
* Returns: The amount of bytes copied. This value can be lower than @size
* when @buffer did not contain enough data.
* gst_buffer_extract:
* @buffer: a #GstBuffer.
* @offset: the offset to extract
- * @dest: the destination address
+ * @dest: (out caller-allocates) (array length=size) (element-type guint8):
+ * the destination address
* @size: the size to extract
*
- * Copy @size bytes starting from @offset in @buffer to @dest.
+ * Copies @size bytes starting from @offset in @buffer to @dest.
*
* Returns: The amount of bytes extracted. This value can be lower than @size
* when @buffer did not contain enough data.
* @mem: (array length=size) (element-type guint8): the memory to compare
* @size: the size to compare
*
- * Compare @size bytes starting from @offset in @buffer with the memory in @mem.
+ * Compares @size bytes starting from @offset in @buffer with the memory in @mem.
*
* Returns: 0 if the memory is equal.
*/
* @val: the value to set
* @size: the size to set
*
- * Fill @buf with @size bytes with @val starting from @offset.
+ * Fills @buf with @size bytes with @val starting from @offset.
*
* Returns: The amount of bytes filled. This value can be lower than @size
* when @buffer did not contain enough data.
* duration and offset end fields are also copied. If not they will be set
* to #GST_CLOCK_TIME_NONE and #GST_BUFFER_OFFSET_NONE.
*
- * MT safe.
- *
* Returns: (transfer full): the new #GstBuffer or %NULL if the arguments were
* invalid.
*/
* @buf1: (transfer full): the first source #GstBuffer to append.
* @buf2: (transfer full): the second source #GstBuffer to append.
*
- * Append all the memory from @buf2 to @buf1. The result buffer will contain a
+ * Appends all the memory from @buf2 to @buf1. The result buffer will contain a
* concatenation of the memory of @buf1 and @buf2.
*
* Returns: (transfer full): the new #GstBuffer that contains the memory
* @offset: the offset in @buf2
* @size: the size or -1 of @buf2
*
- * Append @size bytes at @offset from @buf2 to @buf1. The result buffer will
+ * Appends @size bytes at @offset from @buf2 to @buf1. The result buffer will
* contain a concatenation of the memory of @buf1 and the requested region of
* @buf2.
*
GstMemory *mem;
mem = GST_BUFFER_MEM_PTR (buf2, i);
+ gst_mini_object_remove_parent (GST_MINI_OBJECT_CAST (mem),
+ GST_MINI_OBJECT_CAST (buf2));
GST_BUFFER_MEM_PTR (buf2, i) = NULL;
_memory_add (buf1, -1, mem);
}
* @buffer: a #GstBuffer
* @api: the #GType of an API
*
- * Get the metadata for @api on buffer. When there is no such metadata, %NULL is
+ * Gets the metadata for @api on buffer. When there is no such metadata, %NULL is
* returned. If multiple metadata with the given @api are attached to this
* buffer only the first one is returned. To handle multiple metadata with a
* given API use gst_buffer_iterate_meta() or gst_buffer_foreach_meta() instead
- * and check the meta->info.api member for the API type.
+ * and check the `meta->info.api` member for the API type.
*
- * Returns: (transfer none) (nullable): the metadata for @api on
- * @buffer.
+ * Returns: (transfer none) (nullable): the metadata for @api on @buffer.
*/
GstMeta *
gst_buffer_get_meta (GstBuffer * buffer, GType api)
}
/**
+ * gst_buffer_get_n_meta:
+ * @buffer: a #GstBuffer
+ * @api_type: the #GType of an API
+ *
+ * Returns: number of metas of type @api_type on @buffer.
+ *
+ * Since: 1.14
+ */
+guint
+gst_buffer_get_n_meta (GstBuffer * buffer, GType api_type)
+{
+ gpointer state = NULL;
+ GstMeta *meta;
+ guint n = 0;
+
+ while ((meta = gst_buffer_iterate_meta_filtered (buffer, &state, api_type)))
+ ++n;
+
+ return n;
+}
+
+/**
* gst_buffer_add_meta:
* @buffer: a #GstBuffer
* @info: a #GstMetaInfo
* @params: params for @info
*
- * Add metadata for @info to @buffer using the parameters in @params.
+ * Adds metadata for @info to @buffer using the parameters in @params.
*
- * Returns: (transfer none): the metadata for the api in @info on @buffer.
+ * Returns: (transfer none) (nullable): the metadata for the api in @info on @buffer.
*/
GstMeta *
gst_buffer_add_meta (GstBuffer * buffer, const GstMetaInfo * info,
/* create a new slice */
size = ITEM_SIZE (info);
- item = g_slice_alloc (size);
+ /* We warn in gst_meta_register() about metas without
+ * init function but let's play safe here and prevent
+ * uninitialized memory
+ */
+ if (!info->init_func)
+ item = g_slice_alloc0 (size);
+ else
+ item = g_slice_alloc (size);
result = &item->meta;
result->info = info;
result->flags = GST_META_FLAG_NONE;
-
GST_CAT_DEBUG (GST_CAT_BUFFER,
"alloc metadata %p (%s) of size %" G_GSIZE_FORMAT, result,
g_type_name (info->type), info->size);
if (!info->init_func (result, params, buffer))
goto init_failed;
- /* and add to the list of metadata */
- item->next = GST_BUFFER_META (buffer);
- GST_BUFFER_META (buffer) = item;
+ item->seq_num = gst_atomic_int64_inc (&meta_seq);
+ item->next = NULL;
+
+ if (!GST_BUFFER_META (buffer)) {
+ GST_BUFFER_META (buffer) = item;
+ GST_BUFFER_TAIL_META (buffer) = item;
+ } else {
+ GST_BUFFER_TAIL_META (buffer)->next = item;
+ GST_BUFFER_TAIL_META (buffer) = item;
+ }
return result;
* @buffer: a #GstBuffer
* @meta: a #GstMeta
*
- * Remove the metadata for @meta on @buffer.
+ * Removes the metadata for @meta on @buffer.
*
* Returns: %TRUE if the metadata existed and was removed, %FALSE if no such
* metadata was on @buffer.
const GstMetaInfo *info = meta->info;
/* remove from list */
+ if (GST_BUFFER_TAIL_META (buffer) == walk) {
+ if (prev != walk)
+ GST_BUFFER_TAIL_META (buffer) = prev;
+ else
+ GST_BUFFER_TAIL_META (buffer) = NULL;
+ }
+
if (GST_BUFFER_META (buffer) == walk)
GST_BUFFER_META (buffer) = walk->next;
else
prev->next = walk->next;
+
/* call free_func if any */
if (info->free_func)
info->free_func (m, buffer);
}
/**
- * gst_buffer_iterate_meta:
+ * gst_buffer_iterate_meta: (skip)
* @buffer: a #GstBuffer
- * @state: an opaque state pointer
+ * @state: (out caller-allocates): an opaque state pointer
*
- * Retrieve the next #GstMeta after @current. If @state points
+ * Retrieves the next #GstMeta after @current. If @state points
* to %NULL, the first metadata is returned.
*
* @state will be updated with an opaque state pointer
}
/**
+ * gst_buffer_iterate_meta_filtered: (skip)
+ * @buffer: a #GstBuffer
+ * @state: (out caller-allocates): an opaque state pointer
+ * @meta_api_type: only return #GstMeta of this type
+ *
+ * Retrieves the next #GstMeta of type @meta_api_type after the current one
+ * according to @state. If @state points to %NULL, the first metadata of
+ * type @meta_api_type is returned.
+ *
+ * @state will be updated with an opaque state pointer
+ *
+ * Returns: (transfer none) (nullable): The next #GstMeta of type
+ * @meta_api_type or %NULL when there are no more items.
+ *
+ * Since: 1.12
+ */
+GstMeta *
+gst_buffer_iterate_meta_filtered (GstBuffer * buffer, gpointer * state,
+ GType meta_api_type)
+{
+ GstMetaItem **meta;
+
+ g_return_val_if_fail (buffer != NULL, NULL);
+ g_return_val_if_fail (state != NULL, NULL);
+
+ meta = (GstMetaItem **) state;
+ if (*meta == NULL)
+ /* state NULL, move to first item */
+ *meta = GST_BUFFER_META (buffer);
+ else
+ /* state !NULL, move to next item in list */
+ *meta = (*meta)->next;
+
+ while (*meta != NULL && (*meta)->meta.info->api != meta_api_type)
+ *meta = (*meta)->next;
+
+ if (*meta)
+ return &(*meta)->meta;
+ else
+ return NULL;
+}
+
+/**
* gst_buffer_foreach_meta:
* @buffer: a #GstBuffer
* @func: (scope call): a #GstBufferForeachMetaFunc to call
* @user_data: (closure): user data passed to @func
*
- * Call @func with @user_data for each meta in @buffer.
+ * Calls @func with @user_data for each meta in @buffer.
*
* @func can modify the passed meta pointer or its contents. The return value
- * of @func define if this function returns or if the remaining metadata items
+ * of @func defines if this function returns or if the remaining metadata items
* in the buffer should be skipped.
*
* Returns: %FALSE when @func returned %FALSE for one of the metadata.
g_return_val_if_fail (!GST_META_FLAG_IS_SET (m, GST_META_FLAG_LOCKED),
FALSE);
+ if (GST_BUFFER_TAIL_META (buffer) == walk) {
+ if (prev != walk)
+ GST_BUFFER_TAIL_META (buffer) = prev;
+ else
+ GST_BUFFER_TAIL_META (buffer) = NULL;
+ }
+
/* remove from list */
if (GST_BUFFER_META (buffer) == walk)
- GST_BUFFER_META (buffer) = next;
+ prev = GST_BUFFER_META (buffer) = next;
else
prev->next = next;
/* and free the slice */
g_slice_free1 (ITEM_SIZE (info), walk);
+ } else {
+ prev = walk;
}
if (!res)
break;
* @offset: the offset to extract
* @size: the size to extract
* @dest: (array length=dest_size) (element-type guint8) (out): A pointer where
- * the destination array will be written.
+ * the destination array will be written. Might be %NULL if the size is 0.
* @dest_size: (out): A location where the size of @dest can be written
*
* Extracts a copy of at most @size bytes the data at @offset into
gst_buffer_extract_dup (GstBuffer * buffer, gsize offset, gsize size,
gpointer * dest, gsize * dest_size)
{
- gsize real_size;
+ gsize real_size, alloc_size;
real_size = gst_buffer_get_size (buffer);
- *dest = g_malloc (MIN (real_size - offset, size));
-
- *dest_size = gst_buffer_extract (buffer, offset, *dest, size);
+ alloc_size = MIN (real_size - offset, size);
+ if (alloc_size == 0) {
+ *dest = NULL;
+ *dest_size = 0;
+ } else {
+ *dest = g_malloc (alloc_size);
+ *dest_size = gst_buffer_extract (buffer, offset, *dest, size);
+ }
}
-GST_DEBUG_CATEGORY (gst_parent_buffer_meta_debug);
+GST_DEBUG_CATEGORY_STATIC (gst_parent_buffer_meta_debug);
/**
* gst_buffer_add_parent_buffer_meta:
* @buffer: (transfer none): a #GstBuffer
* @ref: (transfer none): a #GstBuffer to ref
*
- * Add a #GstParentBufferMeta to @buffer that holds a reference on
+ * Adds a #GstParentBufferMeta to @buffer that holds a reference on
* @ref until the buffer is freed.
*
- * Returns: (transfer none): The #GstParentBufferMeta that was added to the buffer
+ * Returns: (transfer none) (nullable): The #GstParentBufferMeta that was added to the buffer
*
* Since: 1.6
*/
_gst_parent_buffer_meta_init (GstParentBufferMeta * parent_meta,
gpointer params, GstBuffer * buffer)
{
- static volatile gsize _init;
+ static gsize _init;
if (g_once_init_enter (&_init)) {
- GST_DEBUG_CATEGORY_INIT (gst_parent_buffer_meta_debug, "glbufferrefmeta", 0,
- "glbufferrefmeta");
+ GST_DEBUG_CATEGORY_INIT (gst_parent_buffer_meta_debug, "parentbuffermeta",
+ 0, "parentbuffermeta");
g_once_init_leave (&_init, 1);
}
return TRUE;
}
+/**
+ * gst_parent_buffer_meta_api_get_type: (attributes doc.skip=true)
+ */
GType
gst_parent_buffer_meta_api_get_type (void)
{
- static volatile GType type = 0;
+ static GType type = 0;
static const gchar *tags[] = { NULL };
if (g_once_init_enter (&type)) {
/**
* gst_parent_buffer_meta_get_info:
*
- * Get the global #GstMetaInfo describing the #GstParentBufferMeta meta.
+ * Gets the global #GstMetaInfo describing the #GstParentBufferMeta meta.
*
* Returns: (transfer none): The #GstMetaInfo
*
{
static const GstMetaInfo *meta_info = NULL;
- if (g_once_init_enter (&meta_info)) {
+ if (g_once_init_enter ((GstMetaInfo **) & meta_info)) {
const GstMetaInfo *meta =
gst_meta_register (gst_parent_buffer_meta_api_get_type (),
"GstParentBufferMeta",
(GstMetaInitFunction) _gst_parent_buffer_meta_init,
(GstMetaFreeFunction) _gst_parent_buffer_meta_free,
_gst_parent_buffer_meta_transform);
- g_once_init_leave (&meta_info, meta);
+ g_once_init_leave ((GstMetaInfo **) & meta_info, (GstMetaInfo *) meta);
}
return meta_info;
}
+
+GST_DEBUG_CATEGORY_STATIC (gst_reference_timestamp_meta_debug);
+
+/**
+ * gst_buffer_add_reference_timestamp_meta:
+ * @buffer: (transfer none): a #GstBuffer
+ * @reference: (transfer none): identifier for the timestamp reference.
+ * @timestamp: timestamp
+ * @duration: duration, or %GST_CLOCK_TIME_NONE
+ *
+ * Adds a #GstReferenceTimestampMeta to @buffer that holds a @timestamp and
+ * optionally @duration based on a specific timestamp @reference. See the
+ * documentation of #GstReferenceTimestampMeta for details.
+ *
+ * Returns: (transfer none) (nullable): The #GstReferenceTimestampMeta that was added to the buffer
+ *
+ * Since: 1.14
+ */
+GstReferenceTimestampMeta *
+gst_buffer_add_reference_timestamp_meta (GstBuffer * buffer,
+ GstCaps * reference, GstClockTime timestamp, GstClockTime duration)
+{
+ GstReferenceTimestampMeta *meta;
+
+ g_return_val_if_fail (GST_IS_CAPS (reference), NULL);
+ g_return_val_if_fail (timestamp != GST_CLOCK_TIME_NONE, NULL);
+
+ meta =
+ (GstReferenceTimestampMeta *) gst_buffer_add_meta (buffer,
+ GST_REFERENCE_TIMESTAMP_META_INFO, NULL);
+
+ if (!meta)
+ return NULL;
+
+ meta->reference = gst_caps_ref (reference);
+ meta->timestamp = timestamp;
+ meta->duration = duration;
+
+ return meta;
+}
+
+/**
+ * gst_buffer_get_reference_timestamp_meta:
+ * @buffer: a #GstBuffer
+ * @reference: (allow-none): a reference #GstCaps
+ *
+ * Finds the first #GstReferenceTimestampMeta on @buffer that conforms to
+ * @reference. Conformance is tested by checking if the meta's reference is a
+ * subset of @reference.
+ *
+ * Buffers can contain multiple #GstReferenceTimestampMeta metadata items.
+ *
+ * Returns: (transfer none) (nullable): the #GstReferenceTimestampMeta or %NULL when there
+ * is no such metadata on @buffer.
+ *
+ * Since: 1.14
+ */
+GstReferenceTimestampMeta *
+gst_buffer_get_reference_timestamp_meta (GstBuffer * buffer,
+ GstCaps * reference)
+{
+ gpointer state = NULL;
+ GstMeta *meta;
+ const GstMetaInfo *info = GST_REFERENCE_TIMESTAMP_META_INFO;
+
+ while ((meta = gst_buffer_iterate_meta (buffer, &state))) {
+ if (meta->info->api == info->api) {
+ GstReferenceTimestampMeta *rmeta = (GstReferenceTimestampMeta *) meta;
+
+ if (!reference)
+ return rmeta;
+ if (gst_caps_is_subset (rmeta->reference, reference))
+ return rmeta;
+ }
+ }
+ return NULL;
+}
+
+static gboolean
+_gst_reference_timestamp_meta_transform (GstBuffer * dest, GstMeta * meta,
+ GstBuffer * buffer, GQuark type, gpointer data)
+{
+ GstReferenceTimestampMeta *dmeta, *smeta;
+
+ /* we copy over the reference timestamp meta, independent of transformation
+ * that happens. If it applied to the original buffer, it still applies to
+ * the new buffer as it refers to the time when the media was captured */
+ smeta = (GstReferenceTimestampMeta *) meta;
+ dmeta =
+ gst_buffer_add_reference_timestamp_meta (dest, smeta->reference,
+ smeta->timestamp, smeta->duration);
+ if (!dmeta)
+ return FALSE;
+
+ GST_CAT_DEBUG (gst_reference_timestamp_meta_debug,
+ "copy reference timestamp metadata from buffer %p to %p", buffer, dest);
+
+ return TRUE;
+}
+
+static void
+_gst_reference_timestamp_meta_free (GstReferenceTimestampMeta * meta,
+ GstBuffer * buffer)
+{
+ if (meta->reference)
+ gst_caps_unref (meta->reference);
+}
+
+static gboolean
+_gst_reference_timestamp_meta_init (GstReferenceTimestampMeta * meta,
+ gpointer params, GstBuffer * buffer)
+{
+ static gsize _init;
+
+ if (g_once_init_enter (&_init)) {
+ GST_DEBUG_CATEGORY_INIT (gst_reference_timestamp_meta_debug,
+ "referencetimestampmeta", 0, "referencetimestampmeta");
+ g_once_init_leave (&_init, 1);
+ }
+
+ meta->reference = NULL;
+ meta->timestamp = GST_CLOCK_TIME_NONE;
+ meta->duration = GST_CLOCK_TIME_NONE;
+
+ return TRUE;
+}
+
+/**
+ * gst_reference_timestamp_meta_api_get_type: (attributes doc.skip=true)
+ */
+GType
+gst_reference_timestamp_meta_api_get_type (void)
+{
+ static GType type = 0;
+ static const gchar *tags[] = { NULL };
+
+ if (g_once_init_enter (&type)) {
+ GType _type =
+ gst_meta_api_type_register ("GstReferenceTimestampMetaAPI", tags);
+ g_once_init_leave (&type, _type);
+ }
+
+ return type;
+}
+
+/**
+ * gst_reference_timestamp_meta_get_info:
+ *
+ * Gets the global #GstMetaInfo describing the #GstReferenceTimestampMeta meta.
+ *
+ * Returns: (transfer none): The #GstMetaInfo
+ *
+ * Since: 1.14
+ */
+const GstMetaInfo *
+gst_reference_timestamp_meta_get_info (void)
+{
+ static const GstMetaInfo *meta_info = NULL;
+
+ if (g_once_init_enter ((GstMetaInfo **) & meta_info)) {
+ const GstMetaInfo *meta =
+ gst_meta_register (gst_reference_timestamp_meta_api_get_type (),
+ "GstReferenceTimestampMeta",
+ sizeof (GstReferenceTimestampMeta),
+ (GstMetaInitFunction) _gst_reference_timestamp_meta_init,
+ (GstMetaFreeFunction) _gst_reference_timestamp_meta_free,
+ _gst_reference_timestamp_meta_transform);
+ g_once_init_leave ((GstMetaInfo **) & meta_info, (GstMetaInfo *) meta);
+ }
+
+ return meta_info;
+}
+
+/**
+ * gst_buffer_add_custom_meta:
+ * @buffer: (transfer none): a #GstBuffer
+ * @name: the registered name of the desired custom meta
+ *
+ * Creates and adds a #GstCustomMeta for the desired @name. @name must have
+ * been successfully registered with gst_meta_register_custom().
+ *
+ * Returns: (transfer none) (nullable): The #GstCustomMeta that was added to the buffer
+ *
+ * Since: 1.20
+ */
+GstCustomMeta *
+gst_buffer_add_custom_meta (GstBuffer * buffer, const gchar * name)
+{
+ GstCustomMeta *meta;
+ const GstMetaInfo *info;
+
+ g_return_val_if_fail (name != NULL, NULL);
+ g_return_val_if_fail (GST_IS_BUFFER (buffer), NULL);
+
+ info = gst_meta_get_info (name);
+
+ if (info == NULL || !gst_meta_info_is_custom (info))
+ return NULL;
+
+ meta = (GstCustomMeta *) gst_buffer_add_meta (buffer, info, NULL);
+
+ return meta;
+}
+
+/**
+ * gst_buffer_get_custom_meta:
+ * @buffer: a #GstBuffer
+ * @name: the registered name of the custom meta to retrieve.
+ *
+ * Finds the first #GstCustomMeta on @buffer for the desired @name.
+ *
+ * Returns: (transfer none) (nullable): the #GstCustomMeta
+ *
+ * Since: 1.20
+ */
+GstCustomMeta *
+gst_buffer_get_custom_meta (GstBuffer * buffer, const gchar * name)
+{
+ const GstMetaInfo *info;
+
+ g_return_val_if_fail (buffer != NULL, NULL);
+ g_return_val_if_fail (name != NULL, NULL);
+
+ info = gst_meta_get_info (name);
+
+ if (!info)
+ return NULL;
+
+ if (!gst_meta_info_is_custom (info))
+ return NULL;
+
+ return (GstCustomMeta *) gst_buffer_get_meta (buffer, info->api);
+}
+
+/**
+ * gst_buffer_ref: (skip)
+ * @buf: a #GstBuffer.
+ *
+ * Increases the refcount of the given buffer by one.
+ *
+ * Note that the refcount affects the writability
+ * of @buf and its metadata, see gst_buffer_is_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: (transfer full): @buf
+ */
+GstBuffer *
+gst_buffer_ref (GstBuffer * buf)
+{
+ return (GstBuffer *) gst_mini_object_ref (GST_MINI_OBJECT_CAST (buf));
+}
+
+/**
+ * gst_buffer_unref: (skip)
+ * @buf: (transfer full): a #GstBuffer.
+ *
+ * Decreases the refcount of the buffer. If the refcount reaches 0, the buffer
+ * with the associated metadata and memory will be freed.
+ */
+void
+gst_buffer_unref (GstBuffer * buf)
+{
+ gst_mini_object_unref (GST_MINI_OBJECT_CAST (buf));
+}
+
+/**
+ * gst_clear_buffer: (skip)
+ * @buf_ptr: a pointer to a #GstBuffer reference
+ *
+ * Clears a reference to a #GstBuffer.
+ *
+ * @buf_ptr must not be %NULL.
+ *
+ * If the reference is %NULL then this function does nothing. Otherwise, the
+ * reference count of the buffer is decreased and the pointer is set to %NULL.
+ *
+ * Since: 1.16
+ */
+void
+gst_clear_buffer (GstBuffer ** buf_ptr)
+{
+ gst_clear_mini_object ((GstMiniObject **) buf_ptr);
+}
+
+/**
+ * gst_buffer_copy: (skip)
+ * @buf: a #GstBuffer.
+ *
+ * Creates a copy of the given buffer. This will only copy the buffer's
+ * data to a newly allocated memory if needed (if the type of memory
+ * requires it), otherwise the underlying data is just referenced.
+ * Check gst_buffer_copy_deep() if you want to force the data
+ * to be copied to newly allocated memory.
+ *
+ * Returns: (transfer full): a new copy of @buf.
+ */
+GstBuffer *
+gst_buffer_copy (const GstBuffer * buf)
+{
+ return GST_BUFFER (gst_mini_object_copy (GST_MINI_OBJECT_CONST_CAST (buf)));
+}
+
+/**
+ * gst_buffer_replace: (skip)
+ * @obuf: (inout) (transfer full) (nullable): pointer to a pointer to
+ * a #GstBuffer to be replaced.
+ * @nbuf: (transfer none) (allow-none): 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.
+ *
+ * Returns: %TRUE when @obuf was different from @nbuf.
+ */
+gboolean
+gst_buffer_replace (GstBuffer ** obuf, GstBuffer * nbuf)
+{
+ return gst_mini_object_replace ((GstMiniObject **) obuf,
+ (GstMiniObject *) nbuf);
+}
projects / platform / upstream / gstreamer.git / blobdiff