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memory: Add 0 padding

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Change gst_allocator_alloc() so that we can also spicify flags and padding.
Add 2 new flags to mark the memory 0 prefixed/padded. This allows us to
remove some resizes in the base classes.
When allocating memory, memset prefix and padding with 0 when the flags tell
us to.
On resize, clear the zero padding flags if we can't guarantee the memory is
still 0 filled.
Update tests.
This commit is contained in:
Wim Taymans 2012-03-14 21:32:22 +01:00
parent 3d76e6011c
commit edd2ffe4d4
8 changed files with 115 additions and 46 deletions
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4
gst/gstbuffer.c
View file

@ -536,7 +536,7 @@ gst_buffer_new_allocate (GstAllocator * allocator, gsize size, gsize align)
#if 1
if (size > 0) {
mem = gst_allocator_alloc (allocator, size, align);
mem = gst_allocator_alloc (allocator, 0, size, 0, size, align);
if (G_UNLIKELY (mem == NULL))
goto no_memory;
} else {
@ -1343,7 +1343,7 @@ _gst_buffer_arr_span (GstMemory ** mem[], gsize len[], guint n, gsize offset,
GstMapInfo dinfo;
guint8 *ptr;
span = gst_allocator_alloc (NULL, size, 0);
span = gst_allocator_alloc (NULL, 0, size, 0, size, 0);
gst_memory_map (span, &dinfo, GST_MAP_WRITE);
ptr = dinfo.data;

8
gst/gstbufferpool.c
View file

@ -182,13 +182,13 @@ default_alloc_buffer (GstBufferPool * pool, GstBuffer ** buffer,
{
GstBufferPoolPrivate *priv = pool->priv;
GstMemory *mem;
gsize maxsize;
*buffer = gst_buffer_new ();
mem =
gst_allocator_alloc (NULL, priv->size + priv->prefix + priv->padding,
priv->align);
gst_memory_resize (mem, priv->prefix, priv->size);
maxsize = priv->size + priv->prefix + priv->padding;
mem = gst_allocator_alloc (NULL, 0, maxsize, priv->prefix,
priv->size, priv->align);
gst_buffer_take_memory (*buffer, -1, mem);
return GST_FLOW_OK;

57
gst/gstmemory.c
View file

@ -169,10 +169,11 @@ _default_mem_new (GstMemoryFlags flags, GstMemory * parent, gpointer data,
/* allocate the memory and structure in one block */
static GstMemoryDefault *
_default_mem_new_block (gsize maxsize, gsize align, gsize offset, gsize size)
_default_mem_new_block (GstMemoryFlags flags, gsize maxsize, gsize align,
gsize offset, gsize size)
{
GstMemoryDefault *mem;
gsize aoffset, slice_size;
gsize aoffset, slice_size, padding;
guint8 *data;
/* ensure configured alignment */
@ -189,19 +190,27 @@ _default_mem_new_block (gsize maxsize, gsize align, gsize offset, gsize size)
data = (guint8 *) mem + sizeof (GstMemoryDefault);
if ((aoffset = ((guintptr) data & align)))
aoffset = (align + 1) - aoffset;
data += (align + 1) - aoffset;
_default_mem_init (mem, 0, NULL, slice_size, data, maxsize,
aoffset + offset, size, NULL, NULL);
if (offset && (flags & GST_MEMORY_FLAG_ZERO_PREFIXED))
memset (data, 0, offset);
padding = maxsize - (offset + size);
if (padding && (flags & GST_MEMORY_FLAG_ZERO_PADDED))
memset (data + offset + size, 0, padding);
_default_mem_init (mem, flags, NULL, slice_size, data, maxsize,
offset, size, NULL, NULL);
return mem;
}
static GstMemory *
_default_alloc_alloc (GstAllocator * allocator, gsize maxsize, gsize align,
gpointer user_data)
_default_alloc_alloc (GstAllocator * allocator, GstMemoryFlags flags,
gsize maxsize, gsize offset, gsize size, gsize align, gpointer user_data)
{
return (GstMemory *) _default_mem_new_block (maxsize, align, 0, maxsize);
return (GstMemory *) _default_mem_new_block (flags, maxsize, align, offset,
size);
}
static gpointer
@ -239,7 +248,7 @@ _default_mem_copy (GstMemoryDefault * mem, gssize offset, gsize size)
size = mem->mem.size > offset ? mem->mem.size - offset : 0;
copy =
_default_mem_new_block (mem->mem.maxsize, 0, mem->mem.offset + offset,
_default_mem_new_block (0, mem->mem.maxsize, 0, mem->mem.offset + offset,
size);
memcpy (copy->data, mem->data, mem->mem.maxsize);
GST_CAT_DEBUG (GST_CAT_PERFORMANCE, "copy memory %p -> %p", mem, copy);
@ -298,7 +307,7 @@ _fallback_mem_copy (GstMemory * mem, gssize offset, gssize size)
size = sinfo.size > offset ? sinfo.size - offset : 0;
/* use the same allocator as the memory we copy */
copy = gst_allocator_alloc (mem->allocator, size, mem->align);
copy = gst_allocator_alloc (mem->allocator, 0, size, 0, size, mem->align);
if (!gst_memory_map (copy, &dinfo, GST_MAP_WRITE)) {
GST_CAT_WARNING (GST_CAT_MEMORY, "could not write map memory %p", copy);
gst_memory_unmap (mem, &sinfo);
@ -378,6 +387,9 @@ _priv_gst_memory_initialize (void)
*
* Allocate a new memory block that wraps the given @data.
*
* The prefix/padding must be filled with 0 if @flags contains
* #GST_MEMORY_FLAG_ZERO_PREFIXED and #GST_MEMORY_FLAG_ZERO_PADDED respectively.
*
* Returns: a new #GstMemory.
*/
GstMemory *
@ -494,6 +506,9 @@ gst_memory_get_sizes (GstMemory * mem, gsize * offset, gsize * maxsize)
*
* Resize the memory region. @mem should be writable and offset + size should be
* less than the maxsize of @mem.
*
* #GST_MEMORY_FLAG_ZERO_PREFIXED and #GST_MEMORY_FLAG_ZERO_PADDED will be
* cleared when offset or padding is increased respectively.
*/
void
gst_memory_resize (GstMemory * mem, gssize offset, gsize size)
@ -502,6 +517,14 @@ gst_memory_resize (GstMemory * mem, gssize offset, gsize size)
g_return_if_fail (offset >= 0 || mem->offset >= -offset);
g_return_if_fail (size + mem->offset + offset <= mem->maxsize);
/* if we increase the prefix, we can't guarantee it is still 0 filled */
if ((offset > 0) && GST_MEMORY_IS_ZERO_PREFIXED (mem))
GST_MEMORY_FLAG_UNSET (mem, GST_MEMORY_FLAG_ZERO_PREFIXED);
/* if we increase the padding, we can't guarantee it is still 0 filled */
if ((offset + size < mem->size) && GST_MEMORY_IS_ZERO_PADDED (mem))
GST_MEMORY_FLAG_UNSET (mem, GST_MEMORY_FLAG_ZERO_PADDED);
mem->offset += offset;
mem->size = size;
}
@ -962,12 +985,20 @@ gst_allocator_set_default (GstAllocator * allocator)
/**
* gst_allocator_alloc:
* @allocator: (transfer none) (allow-none): a #GstAllocator to use
* @flags: the flags
* @maxsize: allocated size of @data
* @offset: offset in allocated memory
* @size: size of visible
* @align: alignment for the data
*
* Use @allocator to allocate a new memory block with memory that is at least
* @maxsize big and has the given alignment.
*
* @offset and @size describe the start and size of the accessible memory.
*
* The prefix/padding will be filled with 0 if @flags contains
* #GST_MEMORY_FLAG_ZERO_PREFIXED and #GST_MEMORY_FLAG_ZERO_PADDED respectively.
*
* When @allocator is NULL, the default allocator will be used.
*
* @align is given as a bitmask so that @align + 1 equals the amount of bytes to
@ -976,7 +1007,8 @@ gst_allocator_set_default (GstAllocator * allocator)
* Returns: (transfer full): a new #GstMemory.
*/
GstMemory *
gst_allocator_alloc (GstAllocator * allocator, gsize maxsize, gsize align)
gst_allocator_alloc (GstAllocator * allocator, GstMemoryFlags flags,
gsize maxsize, gsize offset, gsize size, gsize align)
{
GstMemory *mem;
@ -985,7 +1017,8 @@ gst_allocator_alloc (GstAllocator * allocator, gsize maxsize, gsize align)
if (allocator == NULL)
allocator = _default_allocator;
mem = allocator->info.alloc (allocator, maxsize, align, allocator->user_data);
mem = allocator->info.alloc (allocator, flags, maxsize, offset, size,
align, allocator->user_data);
#ifndef GST_DISABLE_TRACE
_gst_alloc_trace_new (_gst_memory_trace, mem);
#endif

43
gst/gstmemory.h
View file

@ -49,6 +49,8 @@ GST_EXPORT gsize gst_memory_alignment;
* memory with #GST_MAP_WRITE.
* @GST_MEMORY_FLAG_NO_SHARE: memory must not be shared. Copies will have to be
* made when this memory needs to be shared between buffers.
* @GST_MEMORY_FLAG_ZERO_PREFIXED: the memory prefix is filled with 0 bytes
* @GST_MEMORY_FLAG_ZERO_PADDED: the memory padding is filled with 0 bytes
* @GST_MEMORY_FLAG_LAST: first flag that can be used for custom purposes
*
* Flags for wrapped memory.
@ -56,6 +58,8 @@ GST_EXPORT gsize gst_memory_alignment;
typedef enum {
GST_MEMORY_FLAG_READONLY = (1 << 0),
GST_MEMORY_FLAG_NO_SHARE = (1 << 1),
GST_MEMORY_FLAG_ZERO_PREFIXED = (1 << 2),
GST_MEMORY_FLAG_ZERO_PADDED = (1 << 3),
GST_MEMORY_FLAG_LAST = (1 << 16)
} GstMemoryFlags;
@ -75,6 +79,14 @@ typedef enum {
* Gives the status of a specific flag on a @mem.
*/
#define GST_MEMORY_FLAG_IS_SET(mem,flag) !!(GST_MEMORY_FLAGS (mem) & (flag))
/**
* GST_MEMORY_FLAG_UNSET:
* @mem: a #GstMemory.
* @flag: the #GstMemoryFlags to clear.
*
* Clear a specific flag on a @mem.
*/
#define GST_MEMORY_FLAG_UNSET(mem,flag) (GST_MEMORY_FLAGS (mem) &= ~(flag))
/**
* GST_MEMORY_IS_READONLY:
@ -83,6 +95,21 @@ typedef enum {
* Check if @mem is readonly.
*/
#define GST_MEMORY_IS_READONLY(mem) GST_MEMORY_FLAG_IS_SET(mem,GST_MEMORY_FLAG_READONLY)
/**
* GST_MEMORY_IS_ZERO_PREFIXED:
* @mem: a #GstMemory.
*
* Check if the prefix in @mem is 0 filled.
*/
#define GST_MEMORY_IS_ZERO_PREFIXED(mem) GST_MEMORY_FLAG_IS_SET(mem,GST_MEMORY_FLAG_ZERO_PREFIXED)
/**
* GST_MEMORY_IS_ZERO_PADDED:
* @mem: a #GstMemory.
*
* Check if the padding in @mem is 0 filled.
*/
#define GST_MEMORY_IS_ZERO_PADDED(mem) GST_MEMORY_FLAG_IS_SET(mem,GST_MEMORY_FLAG_ZERO_PADDED)
/**
* GstMemory:
@ -169,19 +196,28 @@ typedef struct {
/**
* GstAllocatorAllocFunction:
* @allocator: a #GstAllocator
* @flags: the flags
* @maxsize: the maxsize
* @offset: the offset
* @size: the size
* @align: the alignment
* @user_data: user data
*
* Allocate a new #GstMemory from @allocator that can hold at least @maxsize bytes
* and is aligned to (@align + 1) bytes.
*
* The offset and size of the memory should be set and the prefix/padding must
* be filled with 0 if @flags contains #GST_MEMORY_FLAG_ZERO_PREFIXED and
* #GST_MEMORY_FLAG_ZERO_PADDED respectively.
*
* @user_data is the data that was used when creating @allocator.
*
* Returns: a newly allocated #GstMemory. Free with gst_memory_unref()
*/
typedef GstMemory * (*GstAllocatorAllocFunction) (GstAllocator *allocator,
gsize maxsize, gsize align,
GstMemoryFlags flags,
gsize maxsize, gsize offset,
gsize size, gsize align,
gpointer user_data);
/**
@ -305,8 +341,9 @@ GstAllocator * gst_allocator_find (const gchar *name);
void gst_allocator_set_default (GstAllocator * allocator);
/* allocating memory blocks */
GstMemory * gst_allocator_alloc (GstAllocator * allocator,
gsize maxsize, gsize align);
GstMemory * gst_allocator_alloc (GstAllocator * allocator, GstMemoryFlags flags,
gsize maxsize, gsize offset, gsize size,
gsize align);
GstMemory * gst_memory_new_wrapped (GstMemoryFlags flags, gpointer data, gsize maxsize,
gsize offset, gsize size, gpointer user_data,

6
libs/gst/base/gstbasesrc.c
View file

@ -1360,13 +1360,11 @@ gst_base_src_default_alloc (GstBaseSrc * src, guint64 offset,
maxsize = size + priv->prefix + priv->padding;
mem = gst_allocator_alloc (priv->allocator, maxsize, priv->alignment);
mem = gst_allocator_alloc (priv->allocator, 0, maxsize, priv->prefix,
size, priv->alignment);
if (G_UNLIKELY (mem == NULL))
goto alloc_failed;
if (priv->prefix != 0 || priv->padding != 0)
gst_memory_resize (mem, priv->prefix, size);
*buffer = gst_buffer_new ();
if (G_UNLIKELY (*buffer == NULL))
goto buffer_failed;

5
libs/gst/base/gstbasetransform.c
View file

@ -1523,9 +1523,8 @@ default_prepare_output_buffer (GstBaseTransform * trans,
GST_DEBUG_OBJECT (trans, "doing alloc of size %" G_GSIZE_FORMAT, outsize);
maxsize = outsize + priv->prefix + priv->padding;
mem = gst_allocator_alloc (priv->allocator, maxsize, priv->alignment);
if (priv->prefix != 0 || priv->padding != 0)
gst_memory_resize (mem, priv->prefix, outsize);
mem = gst_allocator_alloc (priv->allocator, 0, maxsize, priv->prefix,
outsize, priv->alignment);
*outbuf = gst_buffer_new ();
gst_buffer_take_memory (*outbuf, -1, mem);

10
tests/check/gst/gstbuffer.c
View file

@ -460,7 +460,7 @@ GST_START_TEST (test_size)
fail_unless (maxsize == maxalloc);
/* new memory */
mem = gst_allocator_alloc (NULL, 100, 0);
mem = gst_allocator_alloc (NULL, 0, 100, 0, 100, 0);
size = gst_memory_get_sizes (mem, &offset, &maxalloc2);
fail_unless (size == 100);
fail_unless (offset == 0);
@ -483,7 +483,7 @@ GST_START_TEST (test_size)
fail_unless (maxalloc == 80 + (maxalloc2 - 20));
/* appending an empty block */
mem = gst_allocator_alloc (NULL, 100, 0);
mem = gst_allocator_alloc (NULL, 0, 100, 0, 100, 0);
size = gst_memory_get_sizes (mem, &offset, &maxalloc3);
gst_memory_resize (mem, 0, 0);
gst_buffer_take_memory (buf, -1, mem);
@ -496,7 +496,7 @@ GST_START_TEST (test_size)
fail_unless (maxalloc == 80 + (maxalloc2 - 20) + maxalloc3);
/* prepending an empty block */
mem = gst_allocator_alloc (NULL, 100, 0);
mem = gst_allocator_alloc (NULL, 0, 100, 0, 100, 0);
size = gst_memory_get_sizes (mem, &offset, &maxalloc4);
gst_memory_resize (mem, 0, 0);
gst_buffer_take_memory (buf, 0, mem);
@ -619,8 +619,8 @@ GST_START_TEST (test_map)
gsize size, offset;
buf = gst_buffer_new ();
gst_buffer_take_memory (buf, -1, gst_allocator_alloc (NULL, 50, 0));
gst_buffer_take_memory (buf, -1, gst_allocator_alloc (NULL, 50, 0));
gst_buffer_take_memory (buf, -1, gst_allocator_alloc (NULL, 0, 50, 0, 50, 0));
gst_buffer_take_memory (buf, -1, gst_allocator_alloc (NULL, 0, 50, 0, 50, 0));
size = gst_buffer_get_sizes (buf, &offset, &maxalloc);
fail_unless (size == 100);

22
tests/check/gst/gstmemory.c
View file

@ -37,7 +37,7 @@ GST_START_TEST (test_submemory)
GstMemory *memory, *sub;
GstMapInfo info, sinfo;
memory = gst_allocator_alloc (NULL, 4, 0);
memory = gst_allocator_alloc (NULL, 0, 4, 0, 4, 0);
/* check sizes, memory starts out empty */
fail_unless (gst_memory_map (memory, &info, GST_MAP_WRITE));
@ -98,7 +98,7 @@ GST_START_TEST (test_is_span)
{
GstMemory *memory, *sub1, *sub2;
memory = gst_allocator_alloc (NULL, 4, 0);
memory = gst_allocator_alloc (NULL, 0, 4, 0, 4, 0);
sub1 = gst_memory_share (memory, 0, 2);
fail_if (sub1 == NULL, "share of memory returned NULL");
@ -196,7 +196,7 @@ GST_START_TEST (test_copy)
GstMemory *memory, *copy;
GstMapInfo info, sinfo;
memory = gst_allocator_alloc (NULL, 4, 0);
memory = gst_allocator_alloc (NULL, 0, 4, 0, 4, 0);
ASSERT_MEMORY_REFCOUNT (memory, "memory", 1);
copy = gst_memory_copy (memory, 0, -1);
@ -217,7 +217,7 @@ GST_START_TEST (test_copy)
gst_memory_unref (copy);
gst_memory_unref (memory);
memory = gst_allocator_alloc (NULL, 0, 0);
memory = gst_allocator_alloc (NULL, 0, 0, 0, 0, 0);
fail_unless (gst_memory_map (memory, &info, GST_MAP_READ));
fail_unless (info.size == 0);
gst_memory_unmap (memory, &info);
@ -238,8 +238,9 @@ GST_START_TEST (test_try_new_and_alloc)
{
GstMemory *mem;
GstMapInfo info;
gsize size;
mem = gst_allocator_alloc (NULL, 0, 0);
mem = gst_allocator_alloc (NULL, 0, 0, 0, 0, 0);
fail_unless (mem != NULL);
fail_unless (gst_memory_map (mem, &info, GST_MAP_READ));
fail_unless (info.size == 0);
@ -247,7 +248,8 @@ GST_START_TEST (test_try_new_and_alloc)
gst_memory_unref (mem);
/* normal alloc should still work */
mem = gst_allocator_alloc (NULL, 640 * 480 * 4, 0);
size = 640 * 480 * 4;
mem = gst_allocator_alloc (NULL, 0, size, 0, size, 0);
fail_unless (mem != NULL);
fail_unless (gst_memory_map (mem, &info, GST_MAP_WRITE));
fail_unless (info.data != NULL);
@ -281,7 +283,7 @@ GST_START_TEST (test_resize)
gsize size, maxsize, offset;
/* one memory block */
mem = gst_allocator_alloc (NULL, 100, 0);
mem = gst_allocator_alloc (NULL, 0, 100, 0, 100, 0);
size = gst_memory_get_sizes (mem, &offset, &maxalloc);
fail_unless (size == 100);
@ -380,7 +382,7 @@ GST_START_TEST (test_map)
gsize size, offset;
/* one memory block */
mem = gst_allocator_alloc (NULL, 100, 0);
mem = gst_allocator_alloc (NULL, 0, 100, 0, 100, 0);
size = gst_memory_get_sizes (mem, &offset, &maxalloc);
fail_unless (size == 100);
@ -404,7 +406,7 @@ GST_START_TEST (test_map_nested)
GstMemory *mem;
GstMapInfo info1, info2;
mem = gst_allocator_alloc (NULL, 100, 0);
mem = gst_allocator_alloc (NULL, 0, 100, 0, 100, 0);
/* nested mapping */
fail_unless (gst_memory_map (mem, &info1, GST_MAP_READ));
@ -458,7 +460,7 @@ GST_START_TEST (test_map_resize)
GstMapInfo info;
gsize size, maxalloc, offset;
mem = gst_allocator_alloc (NULL, 100, 0);
mem = gst_allocator_alloc (NULL, 0, 100, 0, 100, 0);
/* do mapping */
fail_unless (gst_memory_map (mem, &info, GST_MAP_READ));