* size = width * height * bpp;
* buffer = gst_buffer_new ();
* memory = gst_allocator_alloc (NULL, size, NULL);
- * gst_buffer_take_memory (buffer, -1, memory);
+ * gst_buffer_insert_memory (buffer, -1, memory);
* ...
* </programlisting>
* </example>
#include "gstbufferpool.h"
#include "gstinfo.h"
#include "gstutils.h"
-#include "gstminiobject.h"
#include "gstversion.h"
GType _gst_buffer_type = 0;
}
static GstMemory *
-_get_merged_memory (GstBuffer * buffer, gboolean * merged)
+_get_merged_memory (GstBuffer * buffer, guint idx, guint length)
{
GstMemory **mem, *result;
- gsize len;
mem = GST_BUFFER_MEM_ARRAY (buffer);
- len = GST_BUFFER_MEM_LEN (buffer);
- if (G_UNLIKELY (len == 0)) {
+ if (G_UNLIKELY (length == 0)) {
result = NULL;
- *merged = FALSE;
- } else if (G_LIKELY (len == 1)) {
- result = gst_memory_ref (mem[0]);
- *merged = FALSE;
+ } else if (G_LIKELY (length == 1)) {
+ result = gst_memory_ref (mem[idx]);
} else {
GstMemory *parent = NULL;
- gsize size, poffset;
+ gsize size, poffset = 0;
size = gst_buffer_get_size (buffer);
- if (G_UNLIKELY (_is_span (mem, len, &poffset, &parent))) {
+ if (G_UNLIKELY (_is_span (mem + idx, length, &poffset, &parent))) {
if (parent->flags & GST_MEMORY_FLAG_NO_SHARE) {
GST_CAT_DEBUG (GST_CAT_PERFORMANCE, "copy for merge %p", parent);
ptr = dinfo.data;
left = size;
- for (i = 0; i < len && left > 0; i++) {
+ for (i = idx; i < 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 for merge %p from memory %p", result, mem[i]);
+ "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 (result, &dinfo);
}
- *merged = TRUE;
}
return result;
}
static void
-_replace_all_memory (GstBuffer * buffer, GstMemory * mem)
+_replace_memory (GstBuffer * buffer, guint len, guint idx, guint length,
+ GstMemory * mem)
{
- gsize len, i;
+ gsize end, i;
- GST_LOG ("buffer %p replace with memory %p", buffer, mem);
-
- len = GST_BUFFER_MEM_LEN (buffer);
+ end = idx + length;
+ GST_LOG ("buffer %p replace %u-%" G_GSIZE_FORMAT " with memory %p", buffer,
+ idx, end, mem);
/* unref old memory */
- for (i = 0; i < len; i++)
+ for (i = idx; i < end; i++)
gst_memory_unref (GST_BUFFER_MEM_PTR (buffer, i));
- /* replace with single memory */
- GST_BUFFER_MEM_PTR (buffer, 0) = mem;
- GST_BUFFER_MEM_LEN (buffer) = 1;
+
+ if (mem != NULL) {
+ /* replace with single memory */
+ GST_BUFFER_MEM_PTR (buffer, idx) = mem;
+ idx++;
+ length--;
+ }
+
+ if (end < len) {
+ g_memmove (&GST_BUFFER_MEM_PTR (buffer, idx),
+ &GST_BUFFER_MEM_PTR (buffer, end), (len - end) * sizeof (gpointer));
+ }
+ GST_BUFFER_MEM_LEN (buffer) = len - length;
}
static inline void
guint i, len = GST_BUFFER_MEM_LEN (buffer);
if (G_UNLIKELY (len >= GST_BUFFER_MEM_MAX)) {
- gboolean merged;
/* too many buffer, span them. */
/* FIXME, there is room for improvement here: We could only try to merge
* 2 buffers to make some room. If we can't efficiently merge 2 buffers we
* could try to only merge the two smallest buffers to avoid memcpy, etc. */
GST_CAT_DEBUG (GST_CAT_PERFORMANCE, "memory array overflow in buffer %p",
buffer);
- _replace_all_memory (buffer, _get_merged_memory (buffer, &merged));
+ _replace_memory (buffer, len, 0, len, _get_merged_memory (buffer, 0, len));
/* we now have 1 single spanned buffer */
len = 1;
}
}
}
if (flags & GST_BUFFER_COPY_MERGE) {
- gboolean merged;
- _replace_all_memory (dest, _get_merged_memory (dest, &merged));
+ len = GST_BUFFER_MEM_LEN (dest);
+ _replace_memory (dest, len, 0, len, _get_merged_memory (dest, 0, len));
}
}
}
/**
- * gst_buffer_take_memory:
+ * gst_buffer_insert_memory:
* @buffer: a #GstBuffer.
* @idx: the index to add the memory at, or -1 to append it to the end
* @mem: (transfer full): a #GstMemory.
*
- * Add the memory block @mem to @buffer at @idx. This function takes ownership
+ * Insert the memory block @mem to @buffer at @idx. This function takes ownership
* of @mem and thus doesn't increase its refcount.
*/
void
-gst_buffer_take_memory (GstBuffer * buffer, gint idx, GstMemory * mem)
+gst_buffer_insert_memory (GstBuffer * buffer, gint idx, GstMemory * mem)
{
g_return_if_fail (GST_IS_BUFFER (buffer));
g_return_if_fail (gst_buffer_is_writable (buffer));
}
/**
- * gst_buffer_get_memory:
+ * gst_buffer_peek_memory:
* @buffer: a #GstBuffer.
* @idx: an index
*
- * Get the memory block in @buffer at @idx. If @idx is -1, all memory is merged
- * into one large #GstMemory object that is then returned.
+ * Get 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.
+ *
+ * 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 full): a #GstMemory at @idx. Use gst_memory_unref () after usage.
+ * Returns: (transfer none): the #GstMemory at @idx.
*/
GstMemory *
-gst_buffer_get_memory (GstBuffer * buffer, gint idx)
+gst_buffer_peek_memory (GstBuffer * buffer, guint idx)
{
- GstMemory *mem;
+ guint len;
g_return_val_if_fail (GST_IS_BUFFER (buffer), NULL);
- g_return_val_if_fail (idx == -1 ||
- (idx >= 0 && idx <= GST_BUFFER_MEM_LEN (buffer)), NULL);
-
- if (idx == -1) {
- gboolean merged;
- mem = _get_merged_memory (buffer, &merged);
- } else if ((mem = GST_BUFFER_MEM_PTR (buffer, idx))) {
- gst_memory_ref (mem);
- }
- return mem;
+ len = GST_BUFFER_MEM_LEN (buffer);
+ g_return_val_if_fail (idx < len, NULL);
+
+ return GST_BUFFER_MEM_PTR (buffer, idx);
+}
+
+/**
+ * gst_buffer_get_memory_range:
+ * @buffer: a #GstBuffer.
+ * @idx: an index
+ * @length: a length
+ *
+ * Get @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.
+ */
+GstMemory *
+gst_buffer_get_memory_range (GstBuffer * buffer, guint idx, gint length)
+{
+ guint len;
+
+ GST_DEBUG ("idx %u, length %d", idx, length);
+
+ g_return_val_if_fail (GST_IS_BUFFER (buffer), NULL);
+ 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), NULL);
+
+ if (length == -1)
+ length = len - idx;
+
+ return _get_merged_memory (buffer, idx, length);
}
/**
- * gst_buffer_replace_memory:
+ * gst_buffer_replace_memory_range:
* @buffer: a #GstBuffer.
* @idx: an index
+ * @length: a length should not be 0
* @mem: (transfer full): a #GstMemory
*
- * Replaces the memory block in @buffer at @idx with @mem. If @idx is -1, all
- * memory will be removed and replaced with @mem.
+ * Replaces @length memory blocks in @buffer starting at @idx with @mem.
+ *
+ * If @length is -1, all memory starting from @idx will be removed and
+ * replaced with @mem.
*
* @buffer should be writable.
*/
void
-gst_buffer_replace_memory (GstBuffer * buffer, gint idx, GstMemory * mem)
+gst_buffer_replace_memory_range (GstBuffer * buffer, guint idx, gint length,
+ GstMemory * mem)
{
+ guint len;
+
g_return_if_fail (GST_IS_BUFFER (buffer));
g_return_if_fail (gst_buffer_is_writable (buffer));
- g_return_if_fail (idx == -1 ||
- (idx >= 0 && idx < GST_BUFFER_MEM_LEN (buffer)));
+ 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));
- if (idx == -1) {
- _replace_all_memory (buffer, mem);
- } else {
- GstMemory *old;
+ if (length == -1)
+ length = len - idx;
- if ((old = GST_BUFFER_MEM_PTR (buffer, idx)))
- gst_memory_unref (old);
- GST_BUFFER_MEM_PTR (buffer, idx) = mem;
- }
+ _replace_memory (buffer, len, idx, length, mem);
}
/**
* @idx: an index
* @length: a length
*
- * Remove @len memory blocks in @buffer starting from @idx.
+ * Remove @length memory blocks in @buffer starting from @idx.
*
* @length can be -1, in which case all memory starting from @idx is removed.
*/
void
gst_buffer_remove_memory_range (GstBuffer * buffer, guint idx, gint length)
{
- guint len, i, end;
+ guint len;
g_return_if_fail (GST_IS_BUFFER (buffer));
g_return_if_fail (gst_buffer_is_writable (buffer));
len = GST_BUFFER_MEM_LEN (buffer);
- g_return_if_fail ((length == -1 && idx < len) || length + idx < len);
+ g_return_if_fail ((len == 0 && idx == 0 && length == -1) ||
+ (length == -1 && idx < len) || length + idx <= len);
if (length == -1)
length = len - idx;
- end = idx + length;
- for (i = idx; i < end; i++)
- gst_memory_unref (GST_BUFFER_MEM_PTR (buffer, i));
+ _replace_memory (buffer, len, idx, length, NULL);
+}
- if (end != len) {
- g_memmove (&GST_BUFFER_MEM_PTR (buffer, idx),
- &GST_BUFFER_MEM_PTR (buffer, end), (len - end) * sizeof (gpointer));
+/**
+ * gst_buffer_find_memory:
+ * @buffer: a #GstBuffer.
+ * @offset: an offset
+ * @size: a size
+ * @idx: (out): pointer to index
+ * @length: (out): pointer to length
+ * @skip: (out): pointer to skip
+ *
+ * Find 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
+ * memory bock 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
+ * for @offset.
+ *
+ * @size can be -1 to get all the memory blocks after @idx.
+ *
+ * Returns: %TRUE when @size bytes starting from @offset could be found in
+ * @buffer and @idx, @length and @skip will be filled.
+ */
+gboolean
+gst_buffer_find_memory (GstBuffer * buffer, gsize offset, gsize size,
+ guint * idx, guint * length, gsize * skip)
+{
+ guint i, len, found;
+
+ g_return_val_if_fail (GST_IS_BUFFER (buffer), FALSE);
+ g_return_val_if_fail (idx != NULL, FALSE);
+ g_return_val_if_fail (length != NULL, FALSE);
+ g_return_val_if_fail (skip != NULL, FALSE);
+
+ len = GST_BUFFER_MEM_LEN (buffer);
+
+ found = 0;
+ for (i = 0; i < len; i++) {
+ GstMemory *mem;
+ gsize s;
+
+ mem = GST_BUFFER_MEM_PTR (buffer, i);
+ s = gst_memory_get_sizes (mem, NULL, NULL);
+
+ if (s <= offset) {
+ /* block before offset, or empty block, skip */
+ offset -= s;
+ } else {
+ /* block after offset */
+ if (found == 0) {
+ /* first block, remember index and offset */
+ *idx = i;
+ *skip = offset;
+ if (size == -1) {
+ /* return remaining blocks */
+ *length = len - i;
+ return TRUE;
+ }
+ s -= offset;
+ offset = 0;
+ }
+ /* count the amount of found bytes */
+ found += s;
+ if (found >= size) {
+ /* we have enough bytes */
+ *length = i - *idx + 1;
+ return TRUE;
+ }
+ }
}
- GST_BUFFER_MEM_LEN (buffer) = len - length;
+ return FALSE;
}
/**
- * gst_buffer_get_sizes:
+ * gst_buffer_get_sizes_range:
* @buffer: a #GstBuffer.
+ * @idx: an index
+ * @length: a length
* @offset: a pointer to the offset
* @maxsize: a pointer to the maxsize
*
- * Get the total size of all memory blocks in @buffer.
+ * 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 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 with
- * gst_buffer_resize().
+ * 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: the total size of the memory in @buffer.
+ * Returns: total size @length memory blocks starting at @idx in @buffer.
*/
gsize
-gst_buffer_get_sizes (GstBuffer * buffer, gsize * offset, gsize * maxsize)
+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);
+ g_return_val_if_fail ((len == 0 && idx == 0 && length == -1) ||
+ (length == -1 && idx < len) || (length + idx <= len), 0);
+
+ if (length == -1)
+ length = len - idx;
- if (G_LIKELY (len == 1)) {
+ if (G_LIKELY (length == 1)) {
/* common case */
- mem = GST_BUFFER_MEM_PTR (buffer, 0);
+ mem = GST_BUFFER_MEM_PTR (buffer, idx);
size = gst_memory_get_sizes (mem, offset, maxsize);
} else {
- guint i;
+ guint i, end;
gsize extra, offs;
+ end = idx + length;
size = offs = extra = 0;
- for (i = 0; i < len; i++) {
+ for (i = idx; i < end; i++) {
gsize s, o, ms;
mem = GST_BUFFER_MEM_PTR (buffer, i);
}
/**
- * gst_buffer_resize:
+ * gst_buffer_resize_range:
* @buffer: a #GstBuffer.
+ * @idx: an index
+ * @length: a length
* @offset: the offset adjustement
* @size: the new size or -1 to just adjust the offset
*
- * Set the total size of the buffer
+ * Set the total size of the @length memory blocks starting at @idx in
+ * @buffer
*/
void
-gst_buffer_resize (GstBuffer * buffer, gssize offset, gssize size)
+gst_buffer_resize_range (GstBuffer * buffer, guint idx, gint length,
+ gssize offset, gssize size)
{
- guint len;
- guint i;
+ 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);
+ len = GST_BUFFER_MEM_LEN (buffer);
+ g_return_if_fail ((len == 0 && idx == 0 && length == -1) ||
+ (length == -1 && idx < len) || (length + idx <= len));
- bufsize = gst_buffer_get_sizes (buffer, &bufoffs, &bufmax);
+ if (length == -1)
+ length = len - idx;
+
+ bufsize = gst_buffer_get_sizes_range (buffer, idx, length, &bufoffs, &bufmax);
GST_CAT_LOG (GST_CAT_BUFFER, "trim %p %" G_GSSIZE_FORMAT "-%" G_GSSIZE_FORMAT
" size:%" G_GSIZE_FORMAT " offs:%" G_GSIZE_FORMAT " max:%"
if (offset == 0 && size == bufsize)
return;
- len = GST_BUFFER_MEM_LEN (buffer);
-
+ end = idx + length;
/* copy and trim */
- for (i = 0; i < len; i++) {
+ for (i = idx; i < end; i++) {
gsize left, noffs;
mem = GST_BUFFER_MEM_PTR (buffer, i);
noffs = 0;
/* last buffer always gets resized to the remaining size */
- if (i + 1 == len)
+ if (i + 1 == end)
left = size;
/* shrink buffers before the offset */
else if ((gssize) bsize <= offset) {
}
/**
- * gst_buffer_map:
+ * gst_buffer_map_range:
* @buffer: a #GstBuffer.
+ * @idx: an index
+ * @length: a length
* @info: (out): info about the mapping
* @flags: flags for the mapping
*
- * This function fills @info with a pointer to the merged memory in @buffer.
+ * 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()).
* automatically be created and returned. The readonly copy of the buffer memory
* will then also be replaced with this writable copy.
*
- * When the buffer contains multiple memory blocks, the returned pointer will be
- * a concatenation of the memory blocks.
- *
* 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
* data.
*/
gboolean
-gst_buffer_map (GstBuffer * buffer, GstMapInfo * info, GstMapFlags flags)
+gst_buffer_map_range (GstBuffer * buffer, guint idx, gint length,
+ GstMapInfo * info, GstMapFlags flags)
{
GstMemory *mem, *nmem;
- gboolean write, writable, merged;
+ gboolean write, writable;
+ gsize len;
g_return_val_if_fail (GST_IS_BUFFER (buffer), FALSE);
g_return_val_if_fail (info != NULL, FALSE);
+ 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);
write = (flags & GST_MAP_WRITE) != 0;
writable = gst_buffer_is_writable (buffer);
if (G_UNLIKELY (write && !writable))
goto not_writable;
- mem = _get_merged_memory (buffer, &merged);
+ if (length == -1)
+ length = len - idx;
+
+ mem = _get_merged_memory (buffer, idx, length);
if (G_UNLIKELY (mem == NULL))
goto no_memory;
/* if we merged or when the map returned a different memory, we try to replace
* the memory in the buffer */
- if (G_UNLIKELY (merged || nmem != mem)) {
+ if (G_UNLIKELY (length > 1 || nmem != mem)) {
/* if the buffer is writable, replace the memory */
if (writable) {
- _replace_all_memory (buffer, gst_memory_ref (nmem));
+ _replace_memory (buffer, len, idx, length, gst_memory_ref (nmem));
} else {
- if (GST_BUFFER_MEM_LEN (buffer) > 1) {
+ if (len > 1) {
GST_CAT_DEBUG (GST_CAT_PERFORMANCE,
"temporary mapping for memory %p in buffer %p", nmem, buffer);
}
g_return_val_if_fail (buffer != NULL, FALSE);
g_return_val_if_fail (meta != NULL, FALSE);
g_return_val_if_fail (gst_buffer_is_writable (buffer), FALSE);
+ g_return_val_if_fail (!GST_META_FLAG_IS_SET (meta, GST_META_FLAG_LOCKED),
+ FALSE);
/* find the metadata and delete */
prev = GST_BUFFER_META (buffer);
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));
/* remove from list */
if (GST_BUFFER_META (buffer) == walk)
projects / platform / upstream / gstreamer.git / blobdiff