1 files changed, 87 insertions, 0 deletions
diff --git a/libavcodec/mips/mpegvideo_mmi.c b/libavcodec/mips/mpegvideo_mmi.c
new file mode 100644
index 0000000000..623e35af33
--- /dev/null
+++ b/libavcodec/mips/mpegvideo_mmi.c
@@ -0,0 +1,87 @@
+/*
+ * Copyright (c) 2000,2001 Fabrice Bellard
+ *
+ * MMI optimization by Leon van Stuivenberg
+ *
+ * This file is part of Libav.
+ *
+ * Libav is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * Libav is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "libavcodec/avcodec.h"
+#include "libavcodec/dsputil.h"
+#include "libavcodec/mpegvideo.h"
+
+static void dct_unquantize_h263_mmi(MpegEncContext *s,
+                                  DCTELEM *block, int n, int qscale)
+{
+    int level=0, qmul, qadd;
+    int nCoeffs;
+
+    assert(s->block_last_index[n]>=0);
+
+    qadd = (qscale - 1) | 1;
+    qmul = qscale << 1;
+
+    if (s->mb_intra) {
+        if (!s->h263_aic) {
+            if (n < 4)
+                level = block[0] * s->y_dc_scale;
+            else
+                level = block[0] * s->c_dc_scale;
+        }else {
+            qadd = 0;
+            level = block[0];
+        }
+        nCoeffs= 63; //does not always use zigzag table
+    } else {
+        nCoeffs= s->intra_scantable.raster_end[ s->block_last_index[n] ];
+    }
+
+    __asm__ volatile(
+        "add    $14, $0, %3     \n\t"
+        "pcpyld $8, %0, %0      \n\t"
+        "pcpyh  $8, $8          \n\t"   //r8 = qmul
+        "pcpyld $9, %1, %1      \n\t"
+        "pcpyh  $9, $9          \n\t"   //r9 = qadd
+        ".p2align 2             \n\t"
+        "1:                     \n\t"
+        "lq     $10, 0($14)     \n\t"   //r10 = level
+        "addi   $14, $14, 16    \n\t"   //block+=8
+        "addi   %2, %2, -8      \n\t"
+        "pcgth  $11, $0, $10    \n\t"   //r11 = level < 0 ? -1 : 0
+        "pcgth  $12, $10, $0    \n\t"   //r12 = level > 0 ? -1 : 0
+        "por    $12, $11, $12   \n\t"
+        "pmulth $10, $10, $8    \n\t"
+        "paddh  $13, $9, $11    \n\t"
+        "pxor   $13, $13, $11   \n\t"   //r13 = level < 0 ? -qadd : qadd
+        "pmfhl.uw $11           \n\t"
+        "pinteh $10, $11, $10   \n\t"   //r10 = level * qmul
+        "paddh  $10, $10, $13   \n\t"
+        "pand   $10, $10, $12   \n\t"
+        "sq     $10, -16($14)   \n\t"
+        "bgez   %2, 1b          \n\t"
+        :: "r"(qmul), "r" (qadd), "r" (nCoeffs), "r" (block) : "$8", "$9", "$10", "$11", "$12", "$13", "$14", "memory" );
+
+    if(s->mb_intra)
+        block[0]= level;
+}
+
+
+void MPV_common_init_mmi(MpegEncContext *s)
+{
+    s->dct_unquantize_h263_intra =
+    s->dct_unquantize_h263_inter = dct_unquantize_h263_mmi;
+}