1 files changed, 110 insertions, 0 deletions
diff --git a/libavcodec/alpha/mpegvideo_alpha.c b/libavcodec/alpha/mpegvideo_alpha.c
new file mode 100644
index 0000000000..126fe264a1
--- /dev/null
+++ b/libavcodec/alpha/mpegvideo_alpha.c
@@ -0,0 +1,110 @@
+/*
+ * Alpha optimized DSP utils
+ * Copyright (c) 2002 Falk Hueffner <falk@debian.org>
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg 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.
+ *
+ * FFmpeg 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 FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "libavutil/attributes.h"
+#include "libavcodec/mpegvideo.h"
+#include "asm.h"
+
+static void dct_unquantize_h263_axp(int16_t *block, int n_coeffs,
+                                    uint64_t qscale, uint64_t qadd)
+{
+    uint64_t qmul = qscale << 1;
+    uint64_t correction = WORD_VEC(qmul * 255 >> 8);
+    int i;
+
+    qadd = WORD_VEC(qadd);
+
+    for(i = 0; i <= n_coeffs; block += 4, i += 4) {
+        uint64_t levels, negmask, zeros, add, sub;
+
+        levels = ldq(block);
+        if (levels == 0)
+            continue;
+
+#ifdef __alpha_max__
+        /* I don't think the speed difference justifies runtime
+           detection.  */
+        negmask = maxsw4(levels, -1); /* negative -> ffff (-1) */
+        negmask = minsw4(negmask, 0); /* positive -> 0000 (0) */
+#else
+        negmask = cmpbge(WORD_VEC(0x7fff), levels);
+        negmask &= (negmask >> 1) | (1 << 7);
+        negmask = zap(-1, negmask);
+#endif
+
+        zeros = cmpbge(0, levels);
+        zeros &= zeros >> 1;
+        /* zeros |= zeros << 1 is not needed since qadd <= 255, so
+           zapping the lower byte suffices.  */
+
+        levels *= qmul;
+        levels -= correction & (negmask << 16);
+
+        add = qadd & ~negmask;
+        sub = qadd &  negmask;
+        /* Set qadd to 0 for levels == 0.  */
+        add = zap(add, zeros);
+        levels += add;
+        levels -= sub;
+
+        stq(levels, block);
+    }
+}
+
+static void dct_unquantize_h263_intra_axp(MpegEncContext *s, int16_t *block,
+                                    int n, int qscale)
+{
+    int n_coeffs;
+    uint64_t qadd;
+    int16_t block0 = block[0];
+
+    if (!s->h263_aic) {
+        if (n < 4)
+            block0 *= s->y_dc_scale;
+        else
+            block0 *= s->c_dc_scale;
+        qadd = (qscale - 1) | 1;
+    } else {
+        qadd = 0;
+    }
+
+    if(s->ac_pred)
+        n_coeffs = 63;
+    else
+        n_coeffs = s->inter_scantable.raster_end[s->block_last_index[n]];
+
+    dct_unquantize_h263_axp(block, n_coeffs, qscale, qadd);
+
+    block[0] = block0;
+}
+
+static void dct_unquantize_h263_inter_axp(MpegEncContext *s, int16_t *block,
+                                    int n, int qscale)
+{
+    int n_coeffs = s->inter_scantable.raster_end[s->block_last_index[n]];
+    dct_unquantize_h263_axp(block, n_coeffs, qscale, (qscale - 1) | 1);
+}
+
+av_cold void ff_mpv_common_init_axp(MpegEncContext *s)
+{
+    s->dct_unquantize_h263_intra = dct_unquantize_h263_intra_axp;
+    s->dct_unquantize_h263_inter = dct_unquantize_h263_inter_axp;
+}