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buffer: improve size handling

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Also handle the case where multiple empty memory blocks are in the buffer.
Add unit test for this.
This commit is contained in:
Wim Taymans 2011-07-12 13:40:35 +02:00
parent a5ee20db3f
commit a19baf77e7
2 changed files with 90 additions and 10 deletions
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21
gst/gstbuffer.c
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@ -784,18 +784,19 @@ gst_buffer_get_sizes (GstBuffer * buffer, gsize * offset, gsize * maxsize)
mem = GST_BUFFER_MEM_PTR (buffer, i);
s = gst_memory_get_sizes (mem, &o, &ms);
/* add sizes */
size += s;
/* keep offset of first memory block */
if (i == 0)
offs = o;
/* this is the amount of extra bytes in this block, we only keep this for
* the last block */
if (i + 1 == len)
if (s) {
if (size == 0)
/* first size, take accumulated data before as the offset */
offs = extra + o;
/* add sizes */
size += s;
/* save the amount of data after this block */
extra = ms - (o + s);
} else {
/* empty block, add as extra */
extra += ms;
}
}
if (offset)
*offset = offs;
if (maxsize)

79
tests/check/gst/gstbuffer.c
View file

@ -441,6 +441,84 @@ GST_START_TEST (test_try_new_and_alloc)
GST_END_TEST;
GST_START_TEST (test_size)
{
GstBuffer *buf;
GstMemory *mem;
gsize maxalloc, maxalloc2, maxalloc3, maxalloc4;
gsize size, maxsize, offset;
/* one memory block */
buf = gst_buffer_new_allocate (NULL, 100, 0);
size = gst_buffer_get_sizes (buf, &offset, &maxalloc);
fail_unless (size == 100);
fail_unless (offset == 0);
fail_unless (maxalloc >= 100);
mem = gst_buffer_peek_memory (buf, 0, GST_MAP_WRITE);
gst_memory_resize (mem, 10, 70);
size = gst_buffer_get_sizes (buf, &offset, &maxsize);
fail_unless (size == 70);
fail_unless (offset == 10);
fail_unless (maxsize == maxalloc);
/* new memory */
mem = gst_allocator_alloc (NULL, 100, 0);
size = gst_memory_get_sizes (mem, &offset, &maxalloc2);
fail_unless (size == 100);
fail_unless (offset == 0);
fail_unless (maxalloc2 >= 100);
gst_memory_resize (mem, 20, 60);
size = gst_memory_get_sizes (mem, &offset, &maxsize);
fail_unless (size == 60);
fail_unless (offset == 20);
fail_unless (maxsize == maxalloc2);
/* append */
gst_buffer_take_memory (buf, -1, mem);
size = gst_buffer_get_sizes (buf, &offset, &maxalloc);
fail_unless (size == 130);
fail_unless (offset == 10);
/* the maxsize is the size of the first buffer plus the remaining size in the
* second buffer */
fail_unless (maxalloc == 80 + (maxalloc2 - 20));
/* appending an empty block */
mem = gst_allocator_alloc (NULL, 100, 0);
size = gst_memory_get_sizes (mem, &offset, &maxalloc3);
gst_memory_resize (mem, 0, 0);
gst_buffer_take_memory (buf, -1, mem);
size = gst_buffer_get_sizes (buf, &offset, &maxalloc);
fail_unless (size == 130);
fail_unless (offset == 10);
/* the maxsize is the size of the first buffer plus the remaining size in the
* second buffer and the last empty buffer*/
fail_unless (maxalloc == 80 + (maxalloc2 - 20) + maxalloc3);
/* prepending an empty block */
mem = gst_allocator_alloc (NULL, 100, 0);
size = gst_memory_get_sizes (mem, &offset, &maxalloc4);
gst_memory_resize (mem, 0, 0);
gst_buffer_take_memory (buf, 0, mem);
size = gst_buffer_get_sizes (buf, &offset, &maxalloc);
fail_unless (size == 130);
/* empty buffer maxsize can be used as offset */
fail_unless (offset == 10 + maxalloc4);
/* the maxsize is the size of the first buffer plus the remaining size in the
* second buffer and the last empty buffer*/
fail_unless (maxalloc == 80 + (maxalloc2 - 20) + maxalloc3 + maxalloc4);
gst_buffer_unref (buf);
}
GST_END_TEST;
GST_START_TEST (test_resize)
{
GstBuffer *buf;
@ -553,6 +631,7 @@ gst_buffer_suite (void)
tcase_add_test (tc_chain, test_metadata_writable);
tcase_add_test (tc_chain, test_copy);
tcase_add_test (tc_chain, test_try_new_and_alloc);
tcase_add_test (tc_chain, test_size);
tcase_add_test (tc_chain, test_resize);
return s;