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memory: improve semantics of unmap
Make an unmap call with a different data pointer than the map call update the offset field. This allows for both offset and size adjustements in the unmap call.
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parent
d483ff2db5
commit
e4a58ec71e
2 changed files with 42 additions and 10 deletions
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@ -217,13 +217,10 @@ _default_mem_unmap (GstMemoryDefault * mem, gpointer data, gsize size)
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g_return_val_if_fail ((guint8 *) data >= mem->data
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&& (guint8 *) data < mem->data + mem->maxsize, FALSE);
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if (size != -1) {
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/* check if resize happened or unmap was called with different data */
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if (mem->data + mem->offset != data) {
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/* adjust the size */
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size = (guint8 *) data - mem->data + size - mem->offset;
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}
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if (mem->data + mem->offset != data)
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mem->offset = (guint8 *) data - mem->data;
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if (size != -1) {
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g_return_val_if_fail (mem->offset + size <= mem->maxsize, FALSE);
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mem->size = size;
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}
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@ -487,6 +484,9 @@ gst_memory_map (GstMemory * mem, gsize * size, gsize * maxsize,
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* the memory to @size. @size can be set to -1 when the size should not be
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* updated.
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*
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* It is possible to pass a different @data than that obtained from
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* gst_memory_map() in which case the offset of @mem will be updated.
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*
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* Returns: TRUE when the memory was release successfully.
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*/
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gboolean
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@ -479,7 +479,7 @@ GST_END_TEST;
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GST_START_TEST (test_map_resize)
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{
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GstMemory *mem;
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gsize size, maxsize;
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gsize size, maxsize, maxalloc, offset;
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gpointer data;
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mem = gst_allocator_alloc (NULL, 100, 0);
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@ -490,10 +490,42 @@ GST_START_TEST (test_map_resize)
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fail_unless (size == 100);
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/* resize the buffer */
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gst_memory_resize (mem, 1, maxsize - 1);
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gst_memory_resize (mem, 1, size - 1);
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size = gst_memory_get_sizes (mem, &offset, &maxalloc);
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fail_unless (size == 99);
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fail_unless (offset == 1);
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fail_unless (maxalloc >= 100);
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/* unmap the buffer with original pointer and size */
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gst_memory_unmap (mem, data, maxsize);
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/* unmap the buffer with original pointer and size, should restore the offset
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* and size */
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gst_memory_unmap (mem, data, 100);
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size = gst_memory_get_sizes (mem, &offset, &maxalloc);
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fail_unless (size == 100);
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fail_unless (offset == 0);
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fail_unless (maxalloc >= 100);
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data = gst_memory_map (mem, &size, &maxsize, GST_MAP_READ);
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fail_unless (data != NULL);
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fail_unless (size == 100);
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fail_unless (maxsize >= 100);
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/* resize the buffer with unmap */
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gst_memory_unmap (mem, (guint8 *) data + 1, 99);
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size = gst_memory_get_sizes (mem, &offset, &maxalloc);
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fail_unless (size == 99);
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fail_unless (offset == 1);
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fail_unless (maxalloc >= 100);
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/* and larger */
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data = gst_memory_map (mem, &size, &maxsize, GST_MAP_READ);
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gst_memory_unmap (mem, (guint8 *) data - 1, 100);
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size = gst_memory_get_sizes (mem, &offset, &maxalloc);
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fail_unless (size == 100);
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fail_unless (offset == 0);
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fail_unless (maxalloc >= 100);
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gst_memory_unref (mem);
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}
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