gstbuffer.c

gnash 在pc和嵌入式下开发需要的源码

  ASSERT_BUFFER_REFCOUNT (sub2, "sub2", 1);
  ASSERT_BUFFER_REFCOUNT (span, "span", 1);
  fail_unless (memcmp (GST_BUFFER_DATA (span), "tad", 3) == 0,
      "spanned buffer contains the wrong data");
  gst_buffer_unref (span);
  ASSERT_BUFFER_REFCOUNT (buffer, "parent", 3);

  /* clean up */
  gst_buffer_unref (sub1);
  gst_buffer_unref (sub2);
  gst_buffer_unref (buffer);
}

GST_END_TEST;


static const char ro_memory[] = "abcdefghijklmnopqrstuvwxyz";

static GstBuffer *
create_read_only_buffer (void)
{
  GstBuffer *buf;

  buf = (GstBuffer *) gst_mini_object_new (GST_TYPE_BUFFER);

  /* assign some read-only data to the new buffer */
  GST_BUFFER_DATA (buf) = (guint8 *) ro_memory;
  GST_BUFFER_SIZE (buf) = sizeof (ro_memory);

  GST_BUFFER_FLAG_SET (buf, GST_BUFFER_FLAG_READONLY);

  return buf;
}

GST_START_TEST (test_make_writable)
{
  GstBuffer *buf, *buf2;

  /* create read-only buffer and make it writable */
  buf = create_read_only_buffer ();
  fail_unless (GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_READONLY),
      "read-only buffer should have read-only flag set");
  buf = gst_buffer_make_writable (buf);
  fail_unless (!GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_READONLY),
      "writable buffer must not have read-only flag set");
  GST_BUFFER_DATA (buf)[4] = 'a';
  gst_buffer_unref (buf);

  /* alloc'ed buffer with refcount 1 should be writable */
  buf = gst_buffer_new_and_alloc (32);
  fail_unless (!GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_READONLY),
      "_new_and_alloc'ed buffer must not have read-only flag set");
  buf2 = gst_buffer_make_writable (buf);
  fail_unless (buf == buf2,
      "_make_writable() should have returned same buffer");
  gst_buffer_unref (buf2);

  /* alloc'ed buffer with refcount >1 should be copied */
  buf = gst_buffer_new_and_alloc (32);
  fail_unless (!GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_READONLY),
      "_new_and_alloc'ed buffer must not have read-only flag set");
  gst_buffer_ref (buf);
  buf2 = gst_buffer_make_writable (buf);
  fail_unless (buf != buf2, "_make_writable() should have returned a copy!");
  gst_buffer_unref (buf2);
  gst_buffer_unref (buf);
}

GST_END_TEST;

GST_START_TEST (test_subbuffer_make_writable)
{
  GstBuffer *buf, *sub_buf;

  /* create sub-buffer of read-only buffer and make it writable */
  buf = create_read_only_buffer ();
  fail_unless (GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_READONLY),
      "read-only buffer should have read-only flag set");

  sub_buf = gst_buffer_create_sub (buf, 0, 8);
  fail_unless (GST_BUFFER_FLAG_IS_SET (sub_buf, GST_BUFFER_FLAG_READONLY),
      "sub-buffer of read-only buffer should have read-only flag set");

  sub_buf = gst_buffer_make_writable (sub_buf);
  fail_unless (!GST_BUFFER_FLAG_IS_SET (sub_buf, GST_BUFFER_FLAG_READONLY),
      "writable buffer must not have read-only flag set");
  GST_BUFFER_DATA (sub_buf)[4] = 'a';
  gst_buffer_unref (sub_buf);
  gst_buffer_unref (buf);
}

GST_END_TEST;

GST_START_TEST (test_metadata_writable)
{
  GstBuffer *buffer, *sub1;

  buffer = gst_buffer_new_and_alloc (4);
  GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DISCONT);
  GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT);

  /* Buffer with refcount 1 should have writable metadata */
  fail_unless (gst_buffer_is_metadata_writable (buffer) == TRUE);

  /* Check that a buffer with refcount 2 does not have writable metadata */
  gst_buffer_ref (buffer);
  ASSERT_BUFFER_REFCOUNT (buffer, "buffer", 2);
  fail_unless (gst_buffer_is_metadata_writable (buffer) == FALSE);

  /* Check that make_metadata_writable produces a new sub-buffer with 
   * writable metadata. */
  sub1 = gst_buffer_make_metadata_writable (buffer);
  fail_if (sub1 == buffer);
  fail_unless (gst_buffer_is_metadata_writable (sub1) == TRUE);

  /* Check that the original metadata is still not writable 
   * (subbuffer should be holding a reference, and so should we) */
  ASSERT_BUFFER_REFCOUNT (buffer, "buffer", 2);
  fail_unless (gst_buffer_is_metadata_writable (buffer) == FALSE);

  /* Check that make_metadata_writable() maintains the buffer flags */
  fail_unless (GST_BUFFER_FLAG_IS_SET (sub1, GST_BUFFER_FLAG_DISCONT));
  fail_unless (GST_BUFFER_FLAG_IS_SET (sub1, GST_BUFFER_FLAG_DELTA_UNIT));

  /* Unset flags on writable buffer, then make sure they're still
   * set on the original buffer */
  GST_BUFFER_FLAG_UNSET (sub1, GST_BUFFER_FLAG_DISCONT);
  GST_BUFFER_FLAG_UNSET (sub1, GST_BUFFER_FLAG_DELTA_UNIT);
  fail_unless (GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DISCONT));
  fail_unless (GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT));

  /* Drop the subbuffer and check that the metadata is now writable again */
  ASSERT_BUFFER_REFCOUNT (sub1, "sub1", 1);
  gst_buffer_unref (sub1);
  fail_unless (gst_buffer_is_metadata_writable (buffer) == TRUE);

  ASSERT_BUFFER_REFCOUNT (buffer, "buffer", 1);
  gst_buffer_unref (buffer);
}

GST_END_TEST;

GST_START_TEST (test_copy)
{
  GstBuffer *buffer, *copy;

  buffer = gst_buffer_new_and_alloc (4);
  ASSERT_BUFFER_REFCOUNT (buffer, "buffer", 1);

  copy = gst_buffer_copy (buffer);
  ASSERT_BUFFER_REFCOUNT (buffer, "buffer", 1);
  ASSERT_BUFFER_REFCOUNT (copy, "copy", 1);
  /* data must be copied and thus point to different memory */
  fail_if (GST_BUFFER_DATA (buffer) == GST_BUFFER_DATA (copy));

  gst_buffer_unref (copy);
  gst_buffer_unref (buffer);

  /* a 0-sized buffer has NULL data as per docs */
  buffer = gst_buffer_new_and_alloc (0);
  fail_unless (GST_BUFFER_DATA (buffer) == NULL);
  fail_unless (GST_BUFFER_SIZE (buffer) == 0);

  /* copying a 0-sized buffer should not crash and also set
   * the data member NULL. */
  copy = gst_buffer_copy (buffer);
  fail_unless (GST_BUFFER_DATA (copy) == NULL);
  fail_unless (GST_BUFFER_SIZE (copy) == 0);

  gst_buffer_unref (copy);
  gst_buffer_unref (buffer);
}

GST_END_TEST;

GST_START_TEST (test_try_new_and_alloc)
{
  GstBuffer *buf;

  /* special case: alloc of 0 bytes results in new buffer with NULL data */
  buf = gst_buffer_try_new_and_alloc (0);
  fail_unless (buf != NULL);
  fail_unless (GST_IS_BUFFER (buf));
  fail_unless (GST_BUFFER_SIZE (buf) == 0);
  fail_unless (GST_BUFFER_DATA (buf) == NULL);
  fail_unless (GST_BUFFER_MALLOCDATA (buf) == NULL);
  gst_buffer_unref (buf);

  /* normal alloc should still work */
  buf = gst_buffer_try_new_and_alloc (640 * 480 * 4);
  fail_unless (buf != NULL);
  fail_unless (GST_IS_BUFFER (buf));
  fail_unless (GST_BUFFER_SIZE (buf) == (640 * 480 * 4));
  fail_unless (GST_BUFFER_DATA (buf) != NULL);
  fail_unless (GST_BUFFER_MALLOCDATA (buf) != NULL);
  GST_BUFFER_DATA (buf)[640 * 479 * 4 + 479] = 0xff;
  gst_buffer_unref (buf);

#if 0
  /* Disabled this part of the test, because it happily succeeds on 64-bit
   * machines that have enough memory+swap, because the address space is large
   * enough. There's not really any way to test the failure case except by 
   * allocating chunks of memory until it fails, which would suck. */

  /* now this better fail (don't run in valgrind, it will abort
   * or warn when passing silly arguments to malloc) */
  if (!RUNNING_ON_VALGRIND) {
    buf = gst_buffer_try_new_and_alloc ((guint) - 1);
    fail_unless (buf == NULL);
  }
#endif
}

GST_END_TEST;

static Suite *
gst_buffer_suite (void)
{
  Suite *s = suite_create ("GstBuffer");
  TCase *tc_chain = tcase_create ("general");

  suite_add_tcase (s, tc_chain);
  tcase_add_test (tc_chain, test_caps);
  tcase_add_test (tc_chain, test_subbuffer);
  tcase_add_test (tc_chain, test_subbuffer_make_writable);
  tcase_add_test (tc_chain, test_make_writable);
  tcase_add_test (tc_chain, test_is_span_fast);
  tcase_add_test (tc_chain, test_span);
  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);

  return s;
}

GST_CHECK_MAIN (gst_buffer);