adding ffmpeg specific version

1 files changed, 124 insertions, 0 deletions

diff --git a/ffmpeg1/libavcodec/ppc/mpegvideo_altivec.c b/ffmpeg1/libavcodec/ppc/mpegvideo_altivec.c
new file mode 100644
index 0000000..bf490b0
--- /dev/null
+++ b/ffmpeg1/libavcodec/ppc/mpegvideo_altivec.c
@@ -0,0 +1,124 @@
+/*
+ * Copyright (c) 2002 Dieter Shirley
+ *
+ * dct_unquantize_h263_altivec:
+ * Copyright (c) 2003 Romain Dolbeau <romain@dolbeau.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 <stdlib.h>
+#include <stdio.h>
+
+#include "libavutil/attributes.h"
+#include "libavutil/cpu.h"
+#include "libavutil/ppc/types_altivec.h"
+#include "libavutil/ppc/util_altivec.h"
+#include "libavcodec/mpegvideo.h"
+
+#include "dsputil_altivec.h"
+
+/* AltiVec version of dct_unquantize_h263
+   this code assumes `block' is 16 bytes-aligned */
+static void dct_unquantize_h263_altivec(MpegEncContext *s,
+                                 int16_t *block, int n, int qscale)
+{
+    int i, level, 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)
+                block[0] = block[0] * s->y_dc_scale;
+            else
+                block[0] = block[0] * s->c_dc_scale;
+        }else
+            qadd = 0;
+        i = 1;
+        nCoeffs= 63; //does not always use zigzag table
+    } else {
+        i = 0;
+        nCoeffs= s->intra_scantable.raster_end[ s->block_last_index[n] ];
+    }
+
+    {
+        register const vector signed short vczero = (const vector signed short)vec_splat_s16(0);
+        DECLARE_ALIGNED(16, short, qmul8) = qmul;
+        DECLARE_ALIGNED(16, short, qadd8) = qadd;
+        register vector signed short blockv, qmulv, qaddv, nqaddv, temp1;
+        register vector bool short blockv_null, blockv_neg;
+        register short backup_0 = block[0];
+        register int j = 0;
+
+        qmulv = vec_splat((vec_s16)vec_lde(0, &qmul8), 0);
+        qaddv = vec_splat((vec_s16)vec_lde(0, &qadd8), 0);
+        nqaddv = vec_sub(vczero, qaddv);
+
+        // vectorize all the 16 bytes-aligned blocks
+        // of 8 elements
+        for(; (j + 7) <= nCoeffs ; j+=8) {
+            blockv = vec_ld(j << 1, block);
+            blockv_neg = vec_cmplt(blockv, vczero);
+            blockv_null = vec_cmpeq(blockv, vczero);
+            // choose between +qadd or -qadd as the third operand
+            temp1 = vec_sel(qaddv, nqaddv, blockv_neg);
+            // multiply & add (block{i,i+7} * qmul [+-] qadd)
+            temp1 = vec_mladd(blockv, qmulv, temp1);
+            // put 0 where block[{i,i+7} used to have 0
+            blockv = vec_sel(temp1, blockv, blockv_null);
+            vec_st(blockv, j << 1, block);
+        }
+
+        // if nCoeffs isn't a multiple of 8, finish the job
+        // using good old scalar units.
+        // (we could do it using a truncated vector,
+        // but I'm not sure it's worth the hassle)
+        for(; j <= nCoeffs ; j++) {
+            level = block[j];
+            if (level) {
+                if (level < 0) {
+                    level = level * qmul - qadd;
+                } else {
+                    level = level * qmul + qadd;
+                }
+                block[j] = level;
+            }
+        }
+
+        if (i == 1) {
+            // cheat. this avoid special-casing the first iteration
+            block[0] = backup_0;
+        }
+    }
+}
+
+
+av_cold void ff_MPV_common_init_altivec(MpegEncContext *s)
+{
+    if (!(av_get_cpu_flags() & AV_CPU_FLAG_ALTIVEC)) return;
+
+    if ((s->avctx->dct_algo == FF_DCT_AUTO) ||
+            (s->avctx->dct_algo == FF_DCT_ALTIVEC)) {
+        s->dct_unquantize_h263_intra = dct_unquantize_h263_altivec;
+        s->dct_unquantize_h263_inter = dct_unquantize_h263_altivec;
+    }
+}