Profiling on a Raspberry Pi revealed the best performance to correspond
with VLC_BITS = 5. Results for overall audio decode and the get_vlc2 function
in particular are as follows:
Before After
Mean StdDev Mean StdDev Confidence Change
6:2 total 348.8 20.1 339.6 15.1 88.8% +2.7% (insignificant)
6:2 function 38.1 8.1 26.4 4.1 100.0% +44.5%
8:2 total 339.1 15.4 324.5 15.5 99.4% +4.5%
8:2 function 33.8 7.0 27.3 5.6 99.7% +23.6%
6:6 total 604.6 20.8 572.8 20.6 100.0% +5.6%
6:6 function 95.8 8.4 68.9 8.2 100.0% +39.1%
8:8 total 766.4 17.6 741.5 21.2 100.0% +3.4%
8:8 function 106.0 11.4 86.1 9.9 100.0% +23.1%
Signed-off-by: Martin Storsjö <martin@martin.st>
#include "mlp_parser.h"
#include "mlpdsp.h"
#include "mlp.h"
#include "mlp_parser.h"
#include "mlpdsp.h"
#include "mlp.h"
/** number of bits used for VLC lookup - longest Huffman code is 9 */
/** number of bits used for VLC lookup - longest Huffman code is 9 */
+#if ARCH_ARM
+#define VLC_BITS 5
+#define VLC_STATIC_SIZE 64
+#else
+#define VLC_STATIC_SIZE 512
+#endif
typedef struct SubStream {
/// Set if a valid restart header has been read. Otherwise the substream cannot be decoded.
typedef struct SubStream {
/// Set if a valid restart header has been read. Otherwise the substream cannot be decoded.
if (!huff_vlc[0].bits) {
INIT_VLC_STATIC(&huff_vlc[0], VLC_BITS, 18,
&ff_mlp_huffman_tables[0][0][1], 2, 1,
if (!huff_vlc[0].bits) {
INIT_VLC_STATIC(&huff_vlc[0], VLC_BITS, 18,
&ff_mlp_huffman_tables[0][0][1], 2, 1,
- &ff_mlp_huffman_tables[0][0][0], 2, 1, 512);
+ &ff_mlp_huffman_tables[0][0][0], 2, 1, VLC_STATIC_SIZE);
INIT_VLC_STATIC(&huff_vlc[1], VLC_BITS, 16,
&ff_mlp_huffman_tables[1][0][1], 2, 1,
INIT_VLC_STATIC(&huff_vlc[1], VLC_BITS, 16,
&ff_mlp_huffman_tables[1][0][1], 2, 1,
- &ff_mlp_huffman_tables[1][0][0], 2, 1, 512);
+ &ff_mlp_huffman_tables[1][0][0], 2, 1, VLC_STATIC_SIZE);
INIT_VLC_STATIC(&huff_vlc[2], VLC_BITS, 15,
&ff_mlp_huffman_tables[2][0][1], 2, 1,
INIT_VLC_STATIC(&huff_vlc[2], VLC_BITS, 15,
&ff_mlp_huffman_tables[2][0][1], 2, 1,
- &ff_mlp_huffman_tables[2][0][0], 2, 1, 512);
+ &ff_mlp_huffman_tables[2][0][0], 2, 1, VLC_STATIC_SIZE);