*
* 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.
*/
/**
* 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>
+ * |[
* 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
* the refcount drops to 0, any memory and metadata pointed to by the buffer is
* 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)
*/
#include "gst_private.h"
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);
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;
ptr = dinfo.data;
left = size;
- for (i = idx; i < length && left > 0; i++) {
+ 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,
}
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);
}
static inline void
gst_memory_lock (mem, GST_LOCK_FLAG_EXCLUSIVE);
GST_BUFFER_MEM_PTR (buffer, idx) = mem;
GST_BUFFER_MEM_LEN (buffer) = len + 1;
+
+ GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_TAG_MEMORY);
}
GST_DEFINE_MINI_OBJECT_TYPE (GstBuffer, gst_buffer);
}
/**
+ * 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;
+}
+
+/**
* gst_buffer_copy_into:
* @dest: a destination #GstBuffer
* @src: a source #GstBuffer
* 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_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);
+ newmem = gst_memory_share (mem, skip, tocopy);
+ if (newmem)
+ skip = 0;
+ }
+
+ 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);
skip = 0;
- } else {
- mem = gst_memory_ref (mem);
+ } else if (!newmem) {
+ newmem = gst_memory_ref (mem);
}
- _memory_add (dest, -1, mem, TRUE);
+
+ if (!newmem) {
+ gst_buffer_remove_memory_range (dest, dest_len, -1);
+ return FALSE;
+ }
+
+ _memory_add (dest, -1, newmem, TRUE);
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);
}
}
}
}
}
+
+ return TRUE;
}
static GstBuffer *
copy = gst_buffer_new ();
/* we simply copy everything from our parent */
- gst_buffer_copy_into (copy, buffer, GST_BUFFER_COPY_ALL, 0, -1);
+ if (!gst_buffer_copy_into (copy, buffer, GST_BUFFER_COPY_ALL, 0, -1))
+ gst_buffer_replace (©, NULL);
+
+ if (copy)
+ GST_BUFFER_FLAG_UNSET (copy, GST_BUFFER_FLAG_TAG_MEMORY);
return copy;
}
/**
* 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
+ * Returns: (transfer full): a new #GstBuffer, or %NULL if the memory couldn't
* be allocated.
*/
GstBuffer *
if (size > 0)
_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);
+ _memory_add (newbuf, -1, mem, TRUE);
+ 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_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.
*/
*
* 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)
*
* 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)
*
* 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)
GST_BUFFER_MEM_PTR (buffer, idx) = mapped;
/* unlock old memory */
gst_memory_unlock (mem, GST_LOCK_FLAG_EXCLUSIVE);
+ GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_TAG_MEMORY);
}
gst_memory_unref (mem);
* 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_writable() can be used to check if @buffer is the sole owner
- * of the returned memory.
- *
* Returns: (transfer none): the #GstMemory at @idx.
*/
GstMemory *
}
/**
+ * gst_buffer_is_memory_range_writable:
+ * @buffer: a #GstBuffer.
+ * @idx: an index
+ * @length: a length should not be 0
+ *
+ * Check if @length memory blocks in @buffer starting from @idx are writable.
+ *
+ * @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
+ *
+ * Since: 1.4
+ */
+gboolean
+gst_buffer_is_memory_range_writable (GstBuffer * buffer, guint idx, gint length)
+{
+ 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): a pointer to the offset
/**
* gst_buffer_resize:
* @buffer: a #GstBuffer.
- * @offset: the offset adjustement
+ * @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.
* @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;
- 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 */
if (gst_memory_is_writable (mem)) {
gst_memory_resize (mem, offset, left);
} else {
- GstMemory *newmem;
+ GstMemory *newmem = NULL;
- if (GST_MEMORY_IS_NO_SHARE (mem))
- newmem = gst_memory_copy (mem, offset, left);
- else
+ 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_memory_lock (newmem, GST_LOCK_FLAG_EXCLUSIVE);
GST_BUFFER_MEM_PTR (buffer, i) = newmem;
gst_memory_unlock (mem, GST_LOCK_FLAG_EXCLUSIVE);
gst_memory_unref (mem);
+
+ GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_TAG_MEMORY);
}
}
offset = noffs;
size -= left;
}
+
+ return TRUE;
}
/**
* @info: (out): info about the mapping
* @flags: flags for the mapping
*
- * This function fills @idx with the #GstMapInfo of all merged memory
+ * 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
* automatically be created and returned. The readonly copy of the
* buffer memory will then also be replaced with this writable copy.
*
- * The memory in @idx should be unmapped with gst_buffer_unmap() after
+ * The memory in @info should be unmapped with gst_buffer_unmap() after
* usage.
*
- * Returns: %TRUE if the map succeeded and @idx contains valid data.
+ * Returns: %TRUE if the map succeeded and @info contains valid data.
*/
gboolean
gst_buffer_map (GstBuffer * buffer, GstMapInfo * info, GstMapFlags flags)
{
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,
* 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.
"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++) {
*
* 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;
}
}
GST_BUFFER_MEM_LEN (buf2) = 0;
+ GST_BUFFER_FLAG_SET (buf2, GST_BUFFER_FLAG_TAG_MEMORY);
gst_buffer_unref (buf2);
return buf1;
* @api: the #GType of an API
*
* Get the metadata for @api on buffer. When there is no such
- * metadata, NULL is returned.
+ * metadata, %NULL is returned.
*
* Returns: (transfer none): the metadata for @api on @buffer.
*/
* 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: (transfer none): The next #GstMeta or %NULL when there are
* no more items.
}
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.
+ * @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 a #GBytes.
+ * @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;
+
+ real_size = gst_buffer_get_size (buffer);
+
+ *dest = g_malloc (MIN (real_size - offset, size));
+
+ *dest_size = gst_buffer_extract (buffer, offset, *dest, size);
+}
projects / platform / upstream / gstreamer.git / blobdiff