*
* 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.
+ * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
*/
/**
* 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.
- * <example>
- * <title>Creating a buffer for a video frame</title>
- * <programlisting>
+ * |[<!-- language="C" -->
* GstBuffer *buffer;
* GstMemory *memory;
* gint size, width, height, bpp;
* memory = gst_allocator_alloc (NULL, size, NULL);
* gst_buffer_insert_memory (buffer, -1, memory);
* ...
- * </programlisting>
- * </example>
+ * ]|
*
- * Alternatively, use gst_buffer_new_allocate()
- * to create a buffer with preallocated data of a given size.
+ * Alternatively, use gst_buffer_new_allocate() to create a buffer with
+ * preallocated data of a given size.
*
* Buffers can contain a list of #GstMemory objects. You can retrieve how many
* memory objects with gst_buffer_n_memory() and you can get a pointer
* produced so far. For compressed data, it could be the byte offset in a
* source or destination file. Likewise, the end offset will be the offset of
* the end of the buffer. These can only be meaningfully interpreted if you
- * know the media type of the buffer (the preceeding CAPS event). Either or both
+ * know the media type of the buffer (the preceding CAPS event). Either or both
* can be set to #GST_BUFFER_OFFSET_NONE.
*
* gst_buffer_ref() is used to increase the refcount of a buffer. This must be
*
* Several flags of the buffer can be set and unset with the
* GST_BUFFER_FLAG_SET() and GST_BUFFER_FLAG_UNSET() macros. Use
- * GST_BUFFER_FLAG_IS_SET() to test if a certain #GstBufferFlag is set.
+ * GST_BUFFER_FLAG_IS_SET() to test if a certain #GstBufferFlags flag is set.
*
* Buffers can be efficiently merged into a larger buffer with
* gst_buffer_append(). Copying of memory will only be done when absolutely
* unreffed as well. Buffers allocated from a #GstBufferPool will be returned to
* the pool when the refcount drops to 0.
*
- * Last reviewed on 2012-03-28 (0.11.3)
+ * The #GstParentBufferMeta is a meta which can be attached to a #GstBuffer
+ * to hold a reference to another buffer that is only released when the child
+ * #GstBuffer is released.
+ *
+ * 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)
+ *
*/
#include "gst_private.h"
GType _gst_buffer_type = 0;
-typedef struct _GstMetaItem GstMetaItem;
-
-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_SLICE_SIZE(b) (((GstBufferImpl *)(b))->slice_size)
#define GST_BUFFER_MEM_LEN(b) (((GstBufferImpl *)(b))->len)
#define GST_BUFFER_MEM_ARRAY(b) (((GstBufferImpl *)(b))->mem)
#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
{
GstBuffer buffer;
+ gsize slice_size;
+
/* the memory blocks */
guint len;
GstMemory *mem[GST_BUFFER_MEM_MAX];
/* 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 (volatile gint64 * atomic)
+{
+ return __sync_fetch_and_add (atomic, 1);
+}
+#elif defined (G_PLATFORM_WIN32)
+#include <windows.h>
+static inline gint64
+gst_atomic_int64_inc (volatile gint64 * atomic)
+{
+ return InterlockedExchangeAdd64 (atomic, 1);
+}
+#else
+#warning No 64-bit atomic int defined for this platform/toolchain!
+#define NO_64BIT_ATOMIC_INT_FOR_PLATFORM
+G_LOCK_DEFINE_STATIC (meta_seq);
+static inline gint64
+gst_atomic_int64_inc (volatile 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)
{
- GstMemory **mem, *result;
+ GstMemory **mem, *result = NULL;
+
+ GST_CAT_LOG (GST_CAT_BUFFER, "buffer %p, idx %u, length %u", buffer, idx,
+ length);
mem = GST_BUFFER_MEM_ARRAY (buffer);
GstMemory *parent = NULL;
gsize size, poffset = 0;
- size = gst_buffer_get_size (buffer);
+ 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)) {
+ 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 {
- result = gst_memory_share (parent, poffset, size);
}
} else {
gsize i, tocopy, left;
guint8 *ptr;
result = gst_allocator_alloc (NULL, size, NULL);
- gst_memory_map (result, &dinfo, GST_MAP_WRITE);
+ 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;
- for (i = idx; i < length && left > 0; i++) {
- gst_memory_map (mem[i], &sinfo, GST_MAP_READ);
+ 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;
+ }
tocopy = MIN (sinfo.size, left);
GST_CAT_DEBUG (GST_CAT_PERFORMANCE,
"memcpy %" G_GSIZE_FORMAT " bytes for merge %p from memory %p",
gsize end, i;
end = idx + length;
- GST_LOG ("buffer %p replace %u-%" G_GSIZE_FORMAT " with memory %p", buffer,
- idx, end, mem);
+
+ GST_CAT_LOG (GST_CAT_BUFFER,
+ "buffer %p replace %u-%" G_GSIZE_FORMAT " with memory %p", buffer, idx,
+ end, mem);
/* unref old memory */
- for (i = idx; i < end; i++)
- gst_memory_unref (GST_BUFFER_MEM_PTR (buffer, i));
+ for (i = idx; i < end; i++) {
+ 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++;
length--;
}
if (end < len) {
- g_memmove (&GST_BUFFER_MEM_PTR (buffer, idx),
+ memmove (&GST_BUFFER_MEM_PTR (buffer, idx),
&GST_BUFFER_MEM_PTR (buffer, end), (len - end) * sizeof (gpointer));
}
GST_BUFFER_MEM_LEN (buffer) = len - length;
+ GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_TAG_MEMORY);
+}
+
+/**
+ * gst_buffer_get_flags:
+ * @buffer: a #GstBuffer
+ *
+ * Get 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_flag_is_set:
+ * @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)
+{
+ GstMemory *ret = NULL;
+
+ if (gst_memory_lock (mem, GST_LOCK_FLAG_EXCLUSIVE)) {
+ ret = gst_memory_ref (mem);
+ } else {
+ /* we cannot take another exclusive lock as the memory is already
+ * locked WRITE + EXCLUSIVE according to part-miniobject.txt */
+ ret = gst_memory_copy (mem, 0, -1);
+
+ if (ret) {
+ if (!gst_memory_lock (ret, GST_LOCK_FLAG_EXCLUSIVE)) {
+ gst_memory_unref (ret);
+ ret = NULL;
+ }
+ }
+ }
+
+ if (!ret)
+ GST_CAT_WARNING (GST_CAT_BUFFER, "Failed to acquire an exclusive lock for "
+ "memory %p", mem);
+
+ return ret;
}
static inline void
-_memory_add (GstBuffer * buffer, guint idx, GstMemory * mem)
+_memory_add (GstBuffer * buffer, gint idx, GstMemory * mem)
{
guint i, len = GST_BUFFER_MEM_LEN (buffer);
+ GST_CAT_LOG (GST_CAT_BUFFER, "buffer %p, idx %d, mem %p", buffer, idx, mem);
+
if (G_UNLIKELY (len >= GST_BUFFER_MEM_MAX)) {
/* too many buffer, span them. */
/* FIXME, there is room for improvement here: We could only try to merge
/* 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);
}
GST_DEFINE_MINI_OBJECT_TYPE (GstBuffer, gst_buffer);
_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
+ * compile time constant that can be queried with the function.
+ *
+ * When more memory blocks are added, existing memory blocks will be merged
+ * together to make room for the new block.
+ *
+ * Returns: the maximum amount of memory blocks that a buffer can hold.
+ *
+ * Since: 1.2
+ */
+guint
+gst_buffer_get_max_memory (void)
+{
+ return GST_BUFFER_MEM_MAX;
}
/**
* the memory from @src will be appended to @dest.
*
* @flags indicate which fields will be copied.
+ *
+ * Returns: %TRUE if the copying succeeded, %FALSE otherwise.
*/
-void
+gboolean
gst_buffer_copy_into (GstBuffer * dest, GstBuffer * src,
GstBufferCopyFlags flags, gsize offset, gsize size)
{
gsize bufsize;
gboolean region = FALSE;
- g_return_if_fail (dest != NULL);
- g_return_if_fail (src != NULL);
+ g_return_val_if_fail (dest != NULL, FALSE);
+ g_return_val_if_fail (src != NULL, FALSE);
/* nothing to copy if the buffers are the same */
if (G_UNLIKELY (dest == src))
- return;
+ return TRUE;
- g_return_if_fail (gst_buffer_is_writable (dest));
+ g_return_val_if_fail (gst_buffer_is_writable (dest), FALSE);
bufsize = gst_buffer_get_size (src);
- g_return_if_fail (bufsize >= offset);
+ g_return_val_if_fail (bufsize >= offset, FALSE);
if (offset > 0)
region = TRUE;
if (size == -1)
size = bufsize - offset;
if (size < bufsize)
region = TRUE;
- g_return_if_fail (bufsize >= offset + size);
+ g_return_val_if_fail (bufsize >= offset + size, FALSE);
GST_CAT_LOG (GST_CAT_BUFFER, "copy %p to %p, offset %" G_GSIZE_FORMAT
"-%" G_GSIZE_FORMAT "/%" G_GSIZE_FORMAT, src, dest, offset, size,
if (flags & GST_BUFFER_COPY_FLAGS) {
/* copy flags */
- GST_MINI_OBJECT_FLAGS (dest) = GST_MINI_OBJECT_FLAGS (src);
+ guint flags_mask = ~GST_BUFFER_FLAG_TAG_MEMORY;
+
+ GST_MINI_OBJECT_FLAGS (dest) =
+ (GST_MINI_OBJECT_FLAGS (src) & flags_mask) |
+ (GST_MINI_OBJECT_FLAGS (dest) & ~flags_mask);
}
if (flags & GST_BUFFER_COPY_TIMESTAMPS) {
}
if (flags & GST_BUFFER_COPY_MEMORY) {
- GstMemory *mem;
- gsize skip, left, len, i, bsize;
+ gsize skip, left, len, dest_len, i, bsize;
+ gboolean deep;
+
+ deep = flags & GST_BUFFER_COPY_DEEP;
len = GST_BUFFER_MEM_LEN (src);
+ dest_len = GST_BUFFER_MEM_LEN (dest);
left = size;
skip = offset;
/* copy and make regions of the memory */
for (i = 0; i < len && left > 0; i++) {
- mem = GST_BUFFER_MEM_PTR (src, i);
+ GstMemory *mem = GST_BUFFER_MEM_PTR (src, i);
+
bsize = gst_memory_get_sizes (mem, NULL, NULL);
if (bsize <= skip) {
/* don't copy buffer */
skip -= bsize;
} else {
+ GstMemory *newmem = NULL;
gsize tocopy;
tocopy = MIN (bsize - skip, left);
- if (GST_MEMORY_IS_NO_SHARE (mem)) {
- /* no share, always copy then */
- mem = gst_memory_copy (mem, skip, tocopy);
- skip = 0;
- } else if (tocopy < bsize) {
+
+ if (tocopy < bsize && !deep && !GST_MEMORY_IS_NO_SHARE (mem)) {
/* we need to clip something */
- mem = gst_memory_share (mem, skip, tocopy);
- skip = 0;
- } else {
- mem = gst_memory_ref (mem);
+ newmem = gst_memory_share (mem, skip, tocopy);
+ if (newmem) {
+ gst_memory_lock (newmem, GST_LOCK_FLAG_EXCLUSIVE);
+ skip = 0;
+ }
}
- _memory_add (dest, -1, mem);
+
+ if (deep || GST_MEMORY_IS_NO_SHARE (mem) || (!newmem && tocopy < bsize)) {
+ /* deep copy or we're not allowed to share this memory
+ * between buffers, always copy then */
+ newmem = gst_memory_copy (mem, skip, tocopy);
+ if (newmem) {
+ gst_memory_lock (newmem, GST_LOCK_FLAG_EXCLUSIVE);
+ skip = 0;
+ }
+ } else if (!newmem) {
+ newmem = _memory_get_exclusive_reference (mem);
+ }
+
+ if (!newmem) {
+ gst_buffer_remove_memory_range (dest, dest_len, -1);
+ return FALSE;
+ }
+
+ _memory_add (dest, -1, newmem);
left -= tocopy;
}
}
if (flags & GST_BUFFER_COPY_MERGE) {
+ GstMemory *mem;
+
len = GST_BUFFER_MEM_LEN (dest);
- _replace_memory (dest, len, 0, len, _get_merged_memory (dest, 0, len));
+ mem = _get_merged_memory (dest, 0, len);
+ if (!mem) {
+ gst_buffer_remove_memory_range (dest, dest_len, -1);
+ return FALSE;
+ }
+ _replace_memory (dest, len, 0, len, mem);
}
}
if (flags & GST_BUFFER_COPY_META) {
+ /* NOTE: GstGLSyncMeta copying relies on the meta
+ * being copied now, after the buffer data,
+ * so this has to happen last */
for (walk = GST_BUFFER_META (src); walk; walk = walk->next) {
GstMeta *meta = &walk->meta;
const GstMetaInfo *info = meta->info;
- if (info->transform_func) {
+ /* Don't copy memory metas if we only copied part of the buffer, didn't
+ * copy memories or merged memories. In all these cases the memory
+ * structure has changed and the memory meta becomes meaningless.
+ */
+ if ((region || !(flags & GST_BUFFER_COPY_MEMORY)
+ || (flags & GST_BUFFER_COPY_MERGE))
+ && gst_meta_api_type_has_tag (info->api, _gst_meta_tag_memory)) {
+ GST_CAT_DEBUG (GST_CAT_BUFFER,
+ "don't copy memory meta %p of API type %s", meta,
+ g_type_name (info->api));
+ } else if (info->transform_func) {
GstMetaTransformCopy copy_data;
copy_data.region = region;
copy_data.offset = offset;
copy_data.size = size;
- info->transform_func (dest, meta, src,
- _gst_meta_transform_copy, ©_data);
+ if (!info->transform_func (dest, meta, src,
+ _gst_meta_transform_copy, ©_data)) {
+ GST_CAT_ERROR (GST_CAT_BUFFER,
+ "failed to copy meta %p of API type %s", meta,
+ g_type_name (info->api));
+ }
}
}
}
+
+ return TRUE;
}
static GstBuffer *
-_gst_buffer_copy (GstBuffer * buffer)
+gst_buffer_copy_with_flags (const GstBuffer * buffer, GstBufferCopyFlags flags)
{
GstBuffer *copy;
/* create a fresh new buffer */
copy = gst_buffer_new ();
- /* we simply copy everything from our parent */
- gst_buffer_copy_into (copy, buffer, GST_BUFFER_COPY_ALL, 0, -1);
+ /* copy what the 'flags' want from our parent */
+ /* FIXME why we can't pass const to gst_buffer_copy_into() ? */
+ if (!gst_buffer_copy_into (copy, (GstBuffer *) buffer, flags, 0, -1))
+ gst_buffer_replace (©, NULL);
+
+ if (copy)
+ GST_BUFFER_FLAG_UNSET (copy, GST_BUFFER_FLAG_TAG_MEMORY);
return copy;
}
+static GstBuffer *
+_gst_buffer_copy (const GstBuffer * buffer)
+{
+ return gst_buffer_copy_with_flags (buffer, GST_BUFFER_COPY_ALL);
+}
+
+/**
+ * gst_buffer_copy_deep:
+ * @buf: a #GstBuffer.
+ *
+ * Create 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.
+ *
+ * Since: 1.6
+ */
+GstBuffer *
+gst_buffer_copy_deep (const GstBuffer * buffer)
+{
+ return gst_buffer_copy_with_flags (buffer,
+ GST_BUFFER_COPY_ALL | GST_BUFFER_COPY_DEEP);
+}
+
/* the default dispose function revives the buffer and returns it to the
* pool when there is a pool */
static gboolean
/* get the size, when unreffing the memory, we could also unref the buffer
* itself */
- msize = GST_MINI_OBJECT_SIZE (buffer);
+ msize = GST_BUFFER_SLICE_SIZE (buffer);
/* free our memory */
len = GST_BUFFER_MEM_LEN (buffer);
- for (i = 0; i < len; i++)
+ 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));
+ }
/* we set msize to 0 when the buffer is part of the memory block */
- if (msize)
+ if (msize) {
+#ifdef USE_POISONING
+ memset (buffer, 0xff, msize);
+#endif
g_slice_free1 (msize, buffer);
- else
+ } else {
gst_memory_unref (GST_BUFFER_BUFMEM (buffer));
+ }
}
static void
gst_buffer_init (GstBufferImpl * buffer, gsize size)
{
- gst_mini_object_init (GST_MINI_OBJECT_CAST (buffer), _gst_buffer_type, size);
+ gst_mini_object_init (GST_MINI_OBJECT_CAST (buffer), 0, _gst_buffer_type,
+ (GstMiniObjectCopyFunction) _gst_buffer_copy,
+ (GstMiniObjectDisposeFunction) _gst_buffer_dispose,
+ (GstMiniObjectFreeFunction) _gst_buffer_free);
- buffer->buffer.mini_object.copy =
- (GstMiniObjectCopyFunction) _gst_buffer_copy;
- buffer->buffer.mini_object.dispose =
- (GstMiniObjectDisposeFunction) _gst_buffer_dispose;
- buffer->buffer.mini_object.free =
- (GstMiniObjectFreeFunction) _gst_buffer_free;
+ GST_BUFFER_SLICE_SIZE (buffer) = size;
GST_BUFFER (buffer)->pool = NULL;
GST_BUFFER_PTS (buffer) = GST_CLOCK_TIME_NONE;
/**
* gst_buffer_new_allocate:
- * @allocator: (transfer none) (allow-none): the #GstAllocator to use, or NULL to use the
+ * @allocator: (transfer none) (allow-none): the #GstAllocator to use, or %NULL to use the
* default allocator
* @size: the size in bytes of the new buffer's data.
* @params: (transfer none) (allow-none): optional parameters
*
* Tries to create a newly allocated buffer with data of the given size and
* extra parameters from @allocator. If the requested amount of memory can't be
- * allocated, NULL will be returned. The allocated buffer memory is not cleared.
+ * allocated, %NULL will be returned. The allocated buffer memory is not cleared.
*
- * When @allocator is NULL, the default memory allocator will be used.
+ * When @allocator is %NULL, the default memory allocator will be used.
*
* Note that when @size == 0, the buffer will not have memory associated with it.
*
* MT safe.
*
- * Returns: (transfer full): a new #GstBuffer, or NULL if the memory couldn't
- * be allocated.
+ * Returns: (transfer full) (nullable): a new #GstBuffer, or %NULL if
+ * the memory couldn't be allocated.
*/
GstBuffer *
gst_buffer_new_allocate (GstAllocator * allocator, gsize size,
newbuf = gst_buffer_new ();
- if (mem != NULL)
+ if (mem != NULL) {
+ gst_memory_lock (mem, GST_LOCK_FLAG_EXCLUSIVE);
_memory_add (newbuf, -1, mem);
+ }
GST_CAT_LOG (GST_CAT_BUFFER,
"new buffer %p of size %" G_GSIZE_FORMAT " from allocator %p", newbuf,
if (size > 0) {
mem = gst_memory_new_wrapped (0, data + sizeof (GstBufferImpl), NULL,
size, 0, size);
- _memory_add (newbuf, -1, mem);
+ _memory_add (newbuf, -1, mem, TRUE);
}
#endif
GST_BUFFER_BUFMEM (newbuf) = mem;
if (size > 0)
- _memory_add (newbuf, -1, gst_memory_ref (mem));
+ _memory_add (newbuf, -1, gst_memory_ref (mem), TRUE);
#endif
+ GST_BUFFER_FLAG_UNSET (newbuf, GST_BUFFER_FLAG_TAG_MEMORY);
return newbuf;
/**
* gst_buffer_new_wrapped_full:
* @flags: #GstMemoryFlags
- * @data: data to wrap
+ * @data: (array length=size) (element-type guint8) (transfer none): data to wrap
* @maxsize: allocated size of @data
* @offset: offset in @data
* @size: size of valid data
- * @user_data: user_data
- * @notify: called with @user_data when the memory is freed
+ * @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
* @maxsize of memory, the wrapped buffer will have the region from @offset and
gsize maxsize, gsize offset, gsize size, gpointer user_data,
GDestroyNotify notify)
{
+ GstMemory *mem;
GstBuffer *newbuf;
newbuf = gst_buffer_new ();
- gst_buffer_append_memory (newbuf,
- gst_memory_new_wrapped (flags, data, maxsize, offset, size,
- user_data, notify));
+ mem =
+ gst_memory_new_wrapped (flags, data, maxsize, offset, size, user_data,
+ notify);
+ gst_memory_lock (mem, GST_LOCK_FLAG_EXCLUSIVE);
+ _memory_add (newbuf, -1, mem);
+ GST_BUFFER_FLAG_UNSET (newbuf, GST_BUFFER_FLAG_TAG_MEMORY);
return newbuf;
}
/**
* gst_buffer_new_wrapped:
- * @data: data to wrap
+ * @data: (array length=size) (element-type guint8) (transfer full): data to wrap
* @size: allocated size of @data
*
* Creates a new buffer that wraps the given @data. The memory will be freed
}
/**
+ * 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.
+ *
+ * MT safe.
+ *
+ * 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_n_memory:
* @buffer: a #GstBuffer.
*
- * Get the amount of memory blocks that this buffer has.
+ * Get 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)
}
/**
+ * gst_buffer_prepend_memory:
+ * @buffer: a #GstBuffer.
+ * @mem: (transfer full): a #GstMemory.
+ *
+ * Prepend 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.
+ * See gst_buffer_insert_memory() for more details.
+ */
+void
+gst_buffer_prepend_memory (GstBuffer * buffer, GstMemory * mem)
+{
+ gst_buffer_insert_memory (buffer, 0, mem);
+}
+
+/**
+ * gst_buffer_append_memory:
+ * @buffer: a #GstBuffer.
+ * @mem: (transfer full): a #GstMemory.
+ *
+ * Append 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.
+ * See gst_buffer_insert_memory() for more details.
+ */
+void
+gst_buffer_append_memory (GstBuffer * buffer, GstMemory * mem)
+{
+ gst_buffer_insert_memory (buffer, -1, mem);
+}
+
+/**
* gst_buffer_insert_memory:
* @buffer: a #GstBuffer.
* @idx: the index to add the memory at, or -1 to append it to the end
*
* Insert the memory block @mem to @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
+ * added, existing memory blocks will automatically be merged to make room for
+ * the new memory.
*/
void
gst_buffer_insert_memory (GstBuffer * buffer, gint idx, GstMemory * mem)
{
+ GstMemory *tmp;
+
g_return_if_fail (GST_IS_BUFFER (buffer));
g_return_if_fail (gst_buffer_is_writable (buffer));
g_return_if_fail (mem != NULL);
g_return_if_fail (idx == -1 ||
(idx >= 0 && idx <= GST_BUFFER_MEM_LEN (buffer)));
- _memory_add (buffer, idx, mem);
+ tmp = _memory_get_exclusive_reference (mem);
+ g_return_if_fail (tmp != NULL);
+ gst_memory_unref (mem);
+ _memory_add (buffer, idx, tmp);
}
static GstMemory *
{
GstMemory *mem, *mapped;
- mem = GST_BUFFER_MEM_PTR (buffer, idx);
+ mem = gst_memory_ref (GST_BUFFER_MEM_PTR (buffer, idx));
mapped = gst_memory_make_mapped (mem, info, flags);
- if (!mapped)
- return NULL;
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;
- gst_memory_unref (mem);
- mem = 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);
}
- return mem;
+ gst_memory_unref (mem);
+
+ return mapped;
}
/**
* the memory block in @buffer is removed, replaced or merged, typically with
* any call that modifies the memory in @buffer.
*
- * Since this call does not influence the refcount of the memory,
- * gst_memory_is_exclusive() can be used to check if @buffer is the sole owner
- * of the returned memory.
- *
- * Returns: (transfer none): the #GstMemory at @idx.
+ * Returns: (transfer none) (nullable): the #GstMemory at @idx.
*/
GstMemory *
gst_buffer_peek_memory (GstBuffer * buffer, guint idx)
}
/**
+ * gst_buffer_get_memory:
+ * @buffer: a #GstBuffer.
+ * @idx: an index
+ *
+ * Get the memory block at index @idx in @buffer.
+ *
+ * Returns: (transfer full) (nullable): a #GstMemory that contains the data of the
+ * memory block at @idx. Use gst_memory_unref () after usage.
+ */
+GstMemory *
+gst_buffer_get_memory (GstBuffer * buffer, guint idx)
+{
+ return gst_buffer_get_memory_range (buffer, idx, 1);
+}
+
+/**
+ * gst_buffer_get_all_memory:
+ * @buffer: a #GstBuffer.
+ *
+ * Get all the memory block in @buffer. The memory blocks will be merged
+ * into one large #GstMemory.
+ *
+ * Returns: (transfer full) (nullable): a #GstMemory that contains the merged memory.
+ * Use gst_memory_unref () after usage.
+ */
+GstMemory *
+gst_buffer_get_all_memory (GstBuffer * buffer)
+{
+ return gst_buffer_get_memory_range (buffer, 0, -1);
+}
+
+/**
* gst_buffer_get_memory_range:
* @buffer: a #GstBuffer.
* @idx: an index
*
* If @length is -1, all memory starting from @idx is merged.
*
- * Returns: (transfer full): a #GstMemory that contains the merged data of @length
+ * Returns: (transfer full) (nullable): a #GstMemory that contains the merged data of @length
* blocks starting at @idx. Use gst_memory_unref () after usage.
*/
GstMemory *
{
guint len;
- GST_DEBUG ("idx %u, length %d", idx, length);
+ GST_CAT_DEBUG (GST_CAT_BUFFER, "idx %u, length %d", idx, length);
g_return_val_if_fail (GST_IS_BUFFER (buffer), NULL);
len = GST_BUFFER_MEM_LEN (buffer);
}
/**
+ * gst_buffer_replace_memory:
+ * @buffer: a #GstBuffer.
+ * @idx: an index
+ * @mem: (transfer full): a #GstMemory
+ *
+ * Replaces the memory block at index @idx in @buffer with @mem.
+ */
+void
+gst_buffer_replace_memory (GstBuffer * buffer, guint idx, GstMemory * mem)
+{
+ gst_buffer_replace_memory_range (buffer, idx, 1, mem);
+}
+
+/**
+ * gst_buffer_replace_all_memory:
+ * @buffer: a #GstBuffer.
+ * @mem: (transfer full): a #GstMemory
+ *
+ * Replaces all memory in @buffer with @mem.
+ */
+void
+gst_buffer_replace_all_memory (GstBuffer * buffer, GstMemory * mem)
+{
+ gst_buffer_replace_memory_range (buffer, 0, -1, mem);
+}
+
+/**
* gst_buffer_replace_memory_range:
* @buffer: a #GstBuffer.
* @idx: an index
g_return_if_fail (GST_IS_BUFFER (buffer));
g_return_if_fail (gst_buffer_is_writable (buffer));
+
+ GST_CAT_DEBUG (GST_CAT_BUFFER, "idx %u, length %d, %p", idx, length, mem);
+
len = GST_BUFFER_MEM_LEN (buffer);
g_return_if_fail ((len == 0 && idx == 0 && length == -1) ||
(length == -1 && idx < len) || (length > 0 && length + idx <= len));
}
/**
+ * gst_buffer_remove_memory:
+ * @buffer: a #GstBuffer.
+ * @idx: an index
+ *
+ * Remove the memory block in @b at index @i.
+ */
+void
+gst_buffer_remove_memory (GstBuffer * buffer, guint idx)
+{
+ gst_buffer_remove_memory_range (buffer, idx, 1);
+}
+
+/**
+ * gst_buffer_remove_all_memory:
+ * @buffer: a #GstBuffer.
+ *
+ * Remove all the memory blocks in @buffer.
+ */
+void
+gst_buffer_remove_all_memory (GstBuffer * buffer)
+{
+ gst_buffer_remove_memory_range (buffer, 0, -1);
+}
+
+/**
* gst_buffer_remove_memory_range:
* @buffer: a #GstBuffer.
* @idx: an index
g_return_if_fail (GST_IS_BUFFER (buffer));
g_return_if_fail (gst_buffer_is_writable (buffer));
+ GST_CAT_DEBUG (GST_CAT_BUFFER, "idx %u, length %d", idx, length);
+
len = GST_BUFFER_MEM_LEN (buffer);
g_return_if_fail ((len == 0 && idx == 0 && length == -1) ||
(length == -1 && idx < len) || length + idx <= len);
* in @buffer.
*
* When this function returns %TRUE, @idx will contain the index of the first
- * memory bock where the byte for @offset can be found and @length contains the
+ * memory block where the byte for @offset can be found and @length contains the
* number of memory blocks containing the @size remaining bytes. @skip contains
- * the number of bytes to skip in the memory bock at @idx to get to the byte
+ * the number of bytes to skip in the memory block at @idx to get to the byte
* for @offset.
*
* @size can be -1 to get all the memory blocks after @idx.
}
/**
- * gst_buffer_get_sizes_range:
+ * gst_buffer_is_memory_range_writable:
* @buffer: a #GstBuffer.
* @idx: an index
- * @length: a length
- * @offset: a pointer to the offset
- * @maxsize: a pointer to the maxsize
+ * @length: a length should not be 0
*
- * Get the total size of @length memory blocks stating from @idx in @buffer.
+ * Check if @length memory blocks in @buffer starting from @idx are writable.
*
- * 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
- * and @offset and the amount of extra padding on the memory block at @idx +
- * @length -1.
- * @offset and @maxsize can be used to resize the buffer memory blocks with
- * gst_buffer_resize_range().
+ * @length can be -1 to check all the memory blocks after @idx.
+ *
+ * Note that this function does not check if @buffer is writable, use
+ * gst_buffer_is_writable() to check that if needed.
+ *
+ * Returns: %TRUE if the memory range is writable
*
- * Returns: total size @length memory blocks starting at @idx in @buffer.
+ * Since: 1.4
*/
-gsize
-gst_buffer_get_sizes_range (GstBuffer * buffer, guint idx, gint length,
- gsize * offset, gsize * maxsize)
+gboolean
+gst_buffer_is_memory_range_writable (GstBuffer * buffer, guint idx, gint length)
{
- guint len;
- gsize size;
- GstMemory *mem;
+ guint i, len;
+
+ g_return_val_if_fail (GST_IS_BUFFER (buffer), FALSE);
+
+ GST_CAT_DEBUG (GST_CAT_BUFFER, "idx %u, length %d", idx, length);
+
+ len = GST_BUFFER_MEM_LEN (buffer);
+ g_return_val_if_fail ((len == 0 && idx == 0 && length == -1) ||
+ (length == -1 && idx < len) || (length > 0 && length + idx <= len),
+ FALSE);
+
+ if (length == -1)
+ len -= idx;
+ else
+ len = length;
+
+ for (i = 0; i < len; i++) {
+ if (!gst_memory_is_writable (GST_BUFFER_MEM_PTR (buffer, i + idx)))
+ return FALSE;
+ }
+ return TRUE;
+}
+
+/**
+ * gst_buffer_is_all_memory_writable:
+ * @buffer: a #GstBuffer.
+ *
+ * Check 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.
+ *
+ * Returns: %TRUE if all memory blocks in @buffer are writable
+ *
+ * Since: 1.4
+ */
+gboolean
+gst_buffer_is_all_memory_writable (GstBuffer * buffer)
+{
+ return gst_buffer_is_memory_range_writable (buffer, 0, -1);
+}
+
+/**
+ * gst_buffer_get_sizes:
+ * @buffer: a #GstBuffer.
+ * @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.
+ *
+ * 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
+ * the size and @offset and the amount of extra padding on the last
+ * memory block. @offset and @maxsize can be used to resize the
+ * buffer memory blocks with gst_buffer_resize().
+ *
+ * Returns: total size of the memory blocks in @buffer.
+ */
+gsize
+gst_buffer_get_sizes (GstBuffer * buffer, gsize * offset, gsize * maxsize)
+{
+ return gst_buffer_get_sizes_range (buffer, 0, -1, offset, maxsize);
+}
+
+/**
+ * gst_buffer_get_size:
+ * @buffer: a #GstBuffer.
+ *
+ * Get 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);
+}
+
+/**
+ * gst_buffer_get_sizes_range:
+ * @buffer: a #GstBuffer.
+ * @idx: an index
+ * @length: a length
+ * @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.
+ *
+ * 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
+ * and @offset and the amount of extra padding on the memory block at @idx +
+ * @length -1.
+ * @offset and @maxsize can be used to resize the buffer memory blocks with
+ * gst_buffer_resize_range().
+ *
+ * Returns: total size of @length memory blocks starting at @idx in @buffer.
+ */
+gsize
+gst_buffer_get_sizes_range (GstBuffer * buffer, guint idx, gint length,
+ gsize * offset, gsize * maxsize)
+{
+ guint len;
+ gsize size;
+ GstMemory *mem;
g_return_val_if_fail (GST_IS_BUFFER (buffer), 0);
len = GST_BUFFER_MEM_LEN (buffer);
}
/**
+ * gst_buffer_resize:
+ * @buffer: a #GstBuffer.
+ * @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.
+ */
+void
+gst_buffer_resize (GstBuffer * buffer, gssize offset, gssize size)
+{
+ gst_buffer_resize_range (buffer, 0, -1, offset, size);
+}
+
+/**
+ * gst_buffer_set_size:
+ * @buffer: a #GstBuffer.
+ * @size: the new size
+ *
+ * Set the total size of the memory blocks in @buffer.
+ */
+void
+gst_buffer_set_size (GstBuffer * buffer, gssize size)
+{
+ gst_buffer_resize_range (buffer, 0, -1, 0, size);
+}
+
+/**
* gst_buffer_resize_range:
* @buffer: a #GstBuffer.
* @idx: an index
* @length: a length
- * @offset: the offset adjustement
+ * @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
* @buffer
+ *
+ * Returns: %TRUE if resizing succeeded, %FALSE otherwise.
*/
-void
+gboolean
gst_buffer_resize_range (GstBuffer * buffer, guint idx, gint length,
gssize offset, gssize size)
{
guint i, len, end;
gsize bsize, bufsize, bufoffs, bufmax;
- GstMemory *mem;
- g_return_if_fail (gst_buffer_is_writable (buffer));
- g_return_if_fail (size >= -1);
+ g_return_val_if_fail (gst_buffer_is_writable (buffer), FALSE);
+ g_return_val_if_fail (size >= -1, FALSE);
+
len = GST_BUFFER_MEM_LEN (buffer);
- g_return_if_fail ((len == 0 && idx == 0 && length == -1) ||
- (length == -1 && idx < len) || (length + idx <= len));
+ g_return_val_if_fail ((len == 0 && idx == 0 && length == -1) ||
+ (length == -1 && idx < len) || (length + idx <= len), FALSE);
if (length == -1)
length = len - idx;
/* we can't go back further than the current offset or past the end of the
* buffer */
- g_return_if_fail ((offset < 0 && bufoffs >= -offset) || (offset >= 0
- && bufoffs + offset <= bufmax));
+ g_return_val_if_fail ((offset < 0 && bufoffs >= -offset) || (offset >= 0
+ && bufoffs + offset <= bufmax), FALSE);
if (size == -1) {
- g_return_if_fail (bufsize >= offset);
+ g_return_val_if_fail (bufsize >= offset, FALSE);
size = bufsize - offset;
}
- g_return_if_fail (bufmax >= bufoffs + offset + size);
+ g_return_val_if_fail (bufmax >= bufoffs + offset + size, FALSE);
/* no change */
if (offset == 0 && size == bufsize)
- return;
+ return TRUE;
end = idx + length;
/* copy and trim */
for (i = idx; i < end; i++) {
+ GstMemory *mem;
gsize left, noffs;
mem = GST_BUFFER_MEM_PTR (buffer, i);
left = MIN (bsize - offset, size);
if (offset != 0 || left != bsize) {
- if (gst_memory_is_exclusive (mem)) {
+ if (gst_memory_is_writable (mem)) {
gst_memory_resize (mem, offset, left);
} else {
- GstMemory *tmp;
+ GstMemory *newmem = NULL;
- if (GST_MEMORY_IS_NO_SHARE (mem))
- tmp = gst_memory_copy (mem, offset, left);
- else
- tmp = gst_memory_share (mem, offset, left);
+ if (!GST_MEMORY_IS_NO_SHARE (mem))
+ newmem = gst_memory_share (mem, offset, left);
+
+ if (!newmem)
+ newmem = gst_memory_copy (mem, offset, left);
+ 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);
- mem = tmp;
+
+ GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_TAG_MEMORY);
}
}
+
offset = noffs;
size -= left;
-
- GST_BUFFER_MEM_PTR (buffer, i) = mem;
}
+
+ return TRUE;
+}
+
+/**
+ * gst_buffer_map:
+ * @buffer: a #GstBuffer.
+ * @info: (out): info about the mapping
+ * @flags: flags for the mapping
+ *
+ * This function 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
+ * gst_buffer_is_writable()).
+ *
+ * When @buffer is writable but the memory isn't, a writable copy will
+ * automatically be created and returned. The readonly copy of the
+ * buffer memory will then also be replaced with this writable copy.
+ *
+ * The memory in @info should be unmapped with gst_buffer_unmap() after
+ * usage.
+ *
+ * Returns: %TRUE if the map succeeded and @info contains valid data.
+ */
+gboolean
+gst_buffer_map (GstBuffer * buffer, GstMapInfo * info, GstMapFlags flags)
+{
+ return gst_buffer_map_range (buffer, 0, -1, info, flags);
}
/**
* This function 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.
+ *
* @flags describe the desired access of the memory. When @flags is
* #GST_MAP_WRITE, @buffer should be writable (as returned from
* gst_buffer_is_writable()).
*
* The memory in @info should be unmapped with gst_buffer_unmap() after usage.
*
- * Returns: (transfer full): %TRUE if the map succeeded and @info contains valid
+ * Returns: %TRUE if the map succeeded and @info contains valid
* data.
*/
gboolean
(length == -1 && idx < len) || (length > 0
&& length + idx <= len), FALSE);
+ GST_CAT_LOG (GST_CAT_BUFFER, "buffer %p, idx %u, length %d, flags %04x",
+ buffer, idx, length, flags);
+
write = (flags & GST_MAP_WRITE) != 0;
writable = gst_buffer_is_writable (buffer);
{
GST_WARNING_OBJECT (buffer, "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");
- info->memory = NULL;
- info->data = NULL;
- info->size = 0;
- info->maxsize = 0;
+ memset (info, 0, sizeof (GstMapInfo));
return TRUE;
}
cannot_map:
{
GST_DEBUG_OBJECT (buffer, "cannot map memory");
+ memset (info, 0, sizeof (GstMapInfo));
return FALSE;
}
}
* gst_buffer_fill:
* @buffer: a #GstBuffer.
* @offset: the offset to fill
- * @src: the source address
+ * @src: (array length=size) (element-type guint8): the source address
* @size: the size to fill
*
* Copy @size bytes from @src to @buffer at @offset.
g_return_val_if_fail (GST_IS_BUFFER (buffer), 0);
g_return_val_if_fail (gst_buffer_is_writable (buffer), 0);
- g_return_val_if_fail (src != NULL, 0);
+ g_return_val_if_fail (src != NULL || size == 0, 0);
+
+ GST_CAT_LOG (GST_CAT_BUFFER,
+ "buffer %p, offset %" G_GSIZE_FORMAT ", size %" G_GSIZE_FORMAT, buffer,
+ offset, size);
len = GST_BUFFER_MEM_LEN (buffer);
left = size;
* 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.
g_return_val_if_fail (GST_IS_BUFFER (buffer), 0);
g_return_val_if_fail (dest != NULL, 0);
+ GST_CAT_LOG (GST_CAT_BUFFER,
+ "buffer %p, offset %" G_GSIZE_FORMAT ", size %" G_GSIZE_FORMAT, buffer,
+ offset, size);
+
len = GST_BUFFER_MEM_LEN (buffer);
left = size;
* gst_buffer_memcmp:
* @buffer: a #GstBuffer.
* @offset: the offset in @buffer
- * @mem: the memory to compare
+ * @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.
g_return_val_if_fail (GST_IS_BUFFER (buffer), 0);
g_return_val_if_fail (mem != NULL, 0);
+ GST_CAT_LOG (GST_CAT_BUFFER,
+ "buffer %p, offset %" G_GSIZE_FORMAT ", size %" G_GSIZE_FORMAT, buffer,
+ offset, size);
+
+ if (G_UNLIKELY (gst_buffer_get_size (buffer) < offset + size))
+ return -1;
+
len = GST_BUFFER_MEM_LEN (buffer);
for (i = 0; i < len && size > 0 && res == 0; i++) {
g_return_val_if_fail (GST_IS_BUFFER (buffer), 0);
g_return_val_if_fail (gst_buffer_is_writable (buffer), 0);
+ GST_CAT_LOG (GST_CAT_BUFFER,
+ "buffer %p, offset %" G_GSIZE_FORMAT ", val %02x, size %" G_GSIZE_FORMAT,
+ buffer, offset, val, size);
+
len = GST_BUFFER_MEM_LEN (buffer);
left = size;
* gst_buffer_copy_region:
* @parent: a #GstBuffer.
* @flags: the #GstBufferCopyFlags
- * @offset: the offset into parent #GstBuffer at which the new sub-buffer
+ * @offset: the offset into parent #GstBuffer at which the new sub-buffer
* begins.
- * @size: the size of the new #GstBuffer sub-buffer, in bytes.
+ * @size: the size of the new #GstBuffer sub-buffer, in bytes. If -1, all
+ * data is copied.
*
* Creates a sub-buffer from @parent at @offset and @size.
* This sub-buffer uses the actual memory space of the parent buffer.
* This function will copy the offset and timestamp fields when the
- * offset is 0. If not, they will be set to #GST_CLOCK_TIME_NONE and
+ * offset is 0. If not, they will be set to #GST_CLOCK_TIME_NONE and
* #GST_BUFFER_OFFSET_NONE.
* If @offset equals 0 and @size equals the total size of @buffer, the
* duration and offset end fields are also copied. If not they will be set
*
* MT safe.
*
- * Returns: (transfer full): the new #GstBuffer or NULL if the arguments were
+ * Returns: (transfer full): the new #GstBuffer or %NULL if the arguments were
* invalid.
*/
GstBuffer *
GST_CAT_LOG (GST_CAT_BUFFER, "new region copy %p of %p %" G_GSIZE_FORMAT
"-%" G_GSIZE_FORMAT, copy, buffer, offset, size);
- gst_buffer_copy_into (copy, buffer, flags, offset, size);
+ if (!gst_buffer_copy_into (copy, buffer, flags, offset, size))
+ gst_buffer_replace (©, NULL);
return copy;
}
GstBuffer *
gst_buffer_append (GstBuffer * buf1, GstBuffer * buf2)
{
+ return gst_buffer_append_region (buf1, buf2, 0, -1);
+}
+
+/**
+ * gst_buffer_append_region:
+ * @buf1: (transfer full): the first source #GstBuffer to append.
+ * @buf2: (transfer full): the second source #GstBuffer to append.
+ * @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
+ * contain a concatenation of the memory of @buf1 and the requested region of
+ * @buf2.
+ *
+ * Returns: (transfer full): the new #GstBuffer that contains the memory
+ * of the two source buffers.
+ */
+GstBuffer *
+gst_buffer_append_region (GstBuffer * buf1, GstBuffer * buf2, gssize offset,
+ gssize size)
+{
gsize i, len;
g_return_val_if_fail (GST_IS_BUFFER (buf1), NULL);
buf1 = gst_buffer_make_writable (buf1);
buf2 = gst_buffer_make_writable (buf2);
+ gst_buffer_resize (buf2, offset, size);
+
len = GST_BUFFER_MEM_LEN (buf2);
for (i = 0; i < len; i++) {
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);
}
- /* we can calculate the duration too. Also make sure we're not messing
- * with invalid DURATIONS */
- if (GST_BUFFER_DURATION_IS_VALID (buf1) &&
- GST_BUFFER_DURATION_IS_VALID (buf2)) {
- /* add duration */
- GST_BUFFER_DURATION (buf1) += GST_BUFFER_DURATION (buf2);
- }
- if (GST_BUFFER_OFFSET_END_IS_VALID (buf2)) {
- /* set offset_end */
- GST_BUFFER_OFFSET_END (buf1) = GST_BUFFER_OFFSET_END (buf2);
- }
-
GST_BUFFER_MEM_LEN (buf2) = 0;
+ GST_BUFFER_FLAG_SET (buf2, GST_BUFFER_FLAG_TAG_MEMORY);
gst_buffer_unref (buf2);
return buf1;
* @buffer: a #GstBuffer
* @api: the #GType of an API
*
- * Get the metadata for @api on buffer. When there is no such
- * metadata, NULL is returned.
+ * Get 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.
*
- * Returns: 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
*
* Add 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;
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
* to %NULL, the first metadata is returned.
*
- * @state will be updated with an opage state pointer
+ * @state will be updated with an opaque state pointer
*
- * Returns: The next #GstMeta or %NULL when there are no more items.
+ * Returns: (transfer none) (nullable): The next #GstMeta or %NULL
+ * when there are no more items.
*/
GstMeta *
gst_buffer_iterate_meta (GstBuffer * buffer, gpointer * state)
}
/**
+ * 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
+ *
+ * Retrieve 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
* @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
* in the buffer should be skipped.
+ *
+ * Returns: %FALSE when @func returned %FALSE for one of the metadata.
*/
-void
+gboolean
gst_buffer_foreach_meta (GstBuffer * buffer, GstBufferForeachMetaFunc func,
gpointer user_data)
{
GstMetaItem *walk, *prev, *next;
+ gboolean res = TRUE;
- g_return_if_fail (buffer != NULL);
- g_return_if_fail (func != NULL);
+ g_return_val_if_fail (buffer != NULL, FALSE);
+ g_return_val_if_fail (func != NULL, FALSE);
/* find the metadata and delete */
prev = GST_BUFFER_META (buffer);
for (walk = prev; walk; walk = next) {
GstMeta *m, *new;
- gboolean res;
m = new = &walk->meta;
next = walk->next;
GST_CAT_DEBUG (GST_CAT_BUFFER, "remove metadata %p (%s)", m,
g_type_name (info->type));
- g_return_if_fail (gst_buffer_is_writable (buffer));
- g_return_if_fail (!GST_META_FLAG_IS_SET (m, GST_META_FLAG_LOCKED));
+ g_return_val_if_fail (gst_buffer_is_writable (buffer), FALSE);
+ 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;
}
+ return res;
+}
+
+/**
+ * gst_buffer_extract_dup:
+ * @buffer: a #GstBuffer
+ * @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. 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
+ * newly-allocated memory. @dest must be freed using g_free() when done.
+ *
+ * Since: 1.0.10
+ */
+
+void
+gst_buffer_extract_dup (GstBuffer * buffer, gsize offset, gsize size,
+ gpointer * dest, gsize * dest_size)
+{
+ gsize real_size, alloc_size;
+
+ real_size = gst_buffer_get_size (buffer);
+
+ 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_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
+ * @ref until the buffer is freed.
+ *
+ * Returns: (transfer none) (nullable): The #GstParentBufferMeta that was added to the buffer
+ *
+ * Since: 1.6
+ */
+GstParentBufferMeta *
+gst_buffer_add_parent_buffer_meta (GstBuffer * buffer, GstBuffer * ref)
+{
+ GstParentBufferMeta *meta;
+
+ g_return_val_if_fail (GST_IS_BUFFER (ref), NULL);
+
+ meta =
+ (GstParentBufferMeta *) gst_buffer_add_meta (buffer,
+ GST_PARENT_BUFFER_META_INFO, NULL);
+
+ if (!meta)
+ return NULL;
+
+ meta->buffer = gst_buffer_ref (ref);
+
+ return meta;
+}
+
+static gboolean
+_gst_parent_buffer_meta_transform (GstBuffer * dest, GstMeta * meta,
+ GstBuffer * buffer, GQuark type, gpointer data)
+{
+ GstParentBufferMeta *dmeta, *smeta;
+
+ smeta = (GstParentBufferMeta *) meta;
+
+ if (GST_META_TRANSFORM_IS_COPY (type)) {
+ /* copy over the reference to the parent buffer.
+ * Usually, this meta means we need to keep the parent buffer
+ * alive because one of the child memories is in use, which
+ * might not be the case if memory is deep copied or sub-regioned,
+ * but we can't tell, so keep the meta */
+ dmeta = gst_buffer_add_parent_buffer_meta (dest, smeta->buffer);
+ if (!dmeta)
+ return FALSE;
+
+ GST_CAT_DEBUG (gst_parent_buffer_meta_debug,
+ "copy buffer reference metadata");
+ } else {
+ /* return FALSE, if transform type is not supported */
+ return FALSE;
+ }
+ return TRUE;
+}
+
+static void
+_gst_parent_buffer_meta_free (GstParentBufferMeta * parent_meta,
+ GstBuffer * buffer)
+{
+ GST_CAT_DEBUG (gst_parent_buffer_meta_debug,
+ "Dropping reference on buffer %p", parent_meta->buffer);
+ gst_buffer_unref (parent_meta->buffer);
+}
+
+static gboolean
+_gst_parent_buffer_meta_init (GstParentBufferMeta * parent_meta,
+ gpointer params, GstBuffer * buffer)
+{
+ static volatile gsize _init;
+
+ if (g_once_init_enter (&_init)) {
+ GST_DEBUG_CATEGORY_INIT (gst_parent_buffer_meta_debug, "parentbuffermeta",
+ 0, "parentbuffermeta");
+ g_once_init_leave (&_init, 1);
+ }
+
+ parent_meta->buffer = NULL;
+
+ return TRUE;
+}
+
+GType
+gst_parent_buffer_meta_api_get_type (void)
+{
+ static volatile GType type = 0;
+ static const gchar *tags[] = { NULL };
+
+ if (g_once_init_enter (&type)) {
+ GType _type = gst_meta_api_type_register ("GstParentBufferMetaAPI", tags);
+ g_once_init_leave (&type, _type);
+ }
+
+ return type;
+}
+
+/**
+ * gst_parent_buffer_meta_get_info:
+ *
+ * Get the global #GstMetaInfo describing the #GstParentBufferMeta meta.
+ *
+ * Returns: (transfer none): The #GstMetaInfo
+ *
+ * Since: 1.6
+ */
+const GstMetaInfo *
+gst_parent_buffer_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_parent_buffer_meta_api_get_type (),
+ "GstParentBufferMeta",
+ sizeof (GstParentBufferMeta),
+ (GstMetaInitFunction) _gst_parent_buffer_meta_init,
+ (GstMetaFreeFunction) _gst_parent_buffer_meta_free,
+ _gst_parent_buffer_meta_transform);
+ 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
+ *
+ * Add 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
+ *
+ * Find 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 volatile 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;
+}
+
+GType
+gst_reference_timestamp_meta_api_get_type (void)
+{
+ static volatile 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:
+ *
+ * Get 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;
}
projects / platform / upstream / gstreamer.git / blobdiff