renamed - use of s->dct_unquantize function pointer - SHOULD add faster h263 mmx specific unquantization stuff

Originally committed as revision 23 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 227 insertions, 0 deletions

diff --git a/libavcodec/i386/mpegvideo_mmx.c b/libavcodec/i386/mpegvideo_mmx.c
new file mode 100644
index 0000000000..549d019f48
--- /dev/null
+++ b/libavcodec/i386/mpegvideo_mmx.c
@@ -0,0 +1,227 @@
+/*
+ * The simplest mpeg encoder (well, it was the simplest!)
+ * Copyright (c) 2000,2001 Gerard Lantau.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ * Optimized for ia32 cpus by Nick Kurshev <nickols_k@mail.ru>
+ */
+
+#include "../dsputil.h"
+#include "../mpegvideo.h"
+
+#if 0
+
+/* XXX: GL: I don't understand why this function needs optimization
+   (it is called only once per frame!), so I disabled it */
+
+void MPV_frame_start(MpegEncContext *s)
+{
+    if (s->pict_type == B_TYPE) {
+	__asm __volatile(
+	    "movl	(%1), %%eax\n\t"
+	    "movl	4(%1), %%edx\n\t"
+	    "movl	8(%1), %%ecx\n\t"
+	    "movl	%%eax, (%0)\n\t"
+	    "movl	%%edx, 4(%0)\n\t"
+	    "movl	%%ecx, 8(%0)\n\t"
+	    :
+	    :"r"(s->current_picture), "r"(s->aux_picture)
+	    :"eax","edx","ecx","memory");
+    } else {
+            /* swap next and last */
+	__asm __volatile(
+	    "movl	(%1), %%eax\n\t"
+	    "movl	4(%1), %%edx\n\t"
+	    "movl	8(%1), %%ecx\n\t"
+	    "xchgl	(%0), %%eax\n\t"
+	    "xchgl	4(%0), %%edx\n\t"
+	    "xchgl	8(%0), %%ecx\n\t"
+	    "movl	%%eax, (%1)\n\t"
+	    "movl	%%edx, 4(%1)\n\t"
+	    "movl	%%ecx, 8(%1)\n\t"
+	    "movl	%%eax, (%2)\n\t"
+	    "movl	%%edx, 4(%2)\n\t"
+	    "movl	%%ecx, 8(%2)\n\t"
+	    :
+	    :"r"(s->last_picture), "r"(s->next_picture), "r"(s->current_picture)
+	    :"eax","edx","ecx","memory");
+    }
+}
+#endif
+
+static const unsigned long long int mm_wabs __attribute__ ((aligned(8))) = 0xffffffffffffffffULL;
+static const unsigned long long int mm_wone __attribute__ ((aligned(8))) = 0x0001000100010001ULL;
+
+/*
+  NK:
+  Note: looking at PARANOID:
+  "enable all paranoid tests for rounding, overflows, etc..."
+
+#ifdef PARANOID
+                if (level < -2048 || level > 2047)
+                    fprintf(stderr, "unquant error %d %d\n", i, level);
+#endif
+  We can suppose that result of two multiplications can't be greate of 0xFFFF
+  i.e. is 16-bit, so we use here only PMULLW instruction and can avoid
+  a complex multiplication.
+=====================================================
+ Full formula for multiplication of 2 integer numbers
+ which are represent as high:low words:
+ input: value1 = high1:low1
+        value2 = high2:low2
+ output: value3 = value1*value2
+ value3=high3:low3 (on overflow: modulus 2^32 wrap-around)
+ this mean that for 0x123456 * 0x123456 correct result is 0x766cb0ce4
+ but this algorithm will compute only 0x66cb0ce4
+ this limited by 16-bit size of operands
+ ---------------------------------
+ tlow1 = high1*low2
+ tlow2 = high2*low1
+ tlow1 = tlow1 + tlow2
+ high3:low3 = low1*low2
+ high3 += tlow1
+*/
+static void dct_unquantize_mpeg1_mmx(MpegEncContext *s,
+                                     DCTELEM *block, int n, int qscale)
+{
+    int i, level;
+    const UINT16 *quant_matrix;
+    if (s->mb_intra) {
+        if (n < 4) 
+            block[0] = block[0] * s->y_dc_scale;
+        else
+            block[0] = block[0] * s->c_dc_scale;
+        if (s->out_format == FMT_H263) {
+            i = 1;
+            goto unquant_even;
+        }
+        /* XXX: only mpeg1 */
+        quant_matrix = s->intra_matrix;
+	i=1;
+	/* Align on 4 elements boundary */
+	while(i&3)
+	{
+            level = block[i];
+            if (level) {
+                if (level < 0) level = -level;
+                    level = (int)(level * qscale * quant_matrix[i]) >> 3;
+                    level = (level - 1) | 1;
+                if (block[i] < 0) level = -level;
+                block[i] = level;
+            }
+	    i++;
+	}
+	__asm __volatile(
+	"movd	%0, %%mm6\n\t"       /* mm6 = qscale | 0  */
+	"punpckldq %%mm6, %%mm6\n\t" /* mm6 = qscale | qscale */
+	"movq	%2, %%mm4\n\t"
+	"movq	%%mm6, %%mm7\n\t"
+	"movq	%1, %%mm5\n\t"
+	"packssdw %%mm6, %%mm7\n\t" /* mm7 = qscale | qscale | qscale | qscale */
+	"pxor	%%mm6, %%mm6\n\t"
+	::"g"(qscale),"m"(mm_wone),"m"(mm_wabs):"memory");
+        for(;i<64;i+=4) {
+		__asm __volatile(
+			"movq	%1, %%mm0\n\t"
+			"movq	%%mm7, %%mm1\n\t"
+			"movq	%%mm0, %%mm2\n\t"
+			"movq	%%mm0, %%mm3\n\t"
+			"pcmpgtw %%mm6, %%mm2\n\t"
+			"pmullw	%2, %%mm1\n\t"
+			"pandn	%%mm4, %%mm2\n\t"
+			"por	%%mm5, %%mm2\n\t"  
+			"pmullw	%%mm2, %%mm0\n\t" /* mm0 = abs(block[i]). */
+			
+			"pcmpeqw %%mm6, %%mm3\n\t"
+			"pmullw	%%mm0, %%mm1\n\t"
+			"psraw	$3, %%mm1\n\t"
+			"psubw	%%mm5, %%mm1\n\t"   /* block[i] --; */
+			"pandn	%%mm4, %%mm3\n\t"  /* fake of pcmpneqw : mm0 != 0 then mm1 = -1 */
+			"por	%%mm5, %%mm1\n\t"   /* block[i] |= 1 */
+			"pmullw %%mm2, %%mm1\n\t"   /* change signs again */
+
+			"pand	%%mm3, %%mm1\n\t" /* nullify if was zero */
+			"movq	%%mm1, %0"
+			:"=m"(block[i])
+			:"m"(block[i]), "m"(quant_matrix[i])
+			:"memory");
+        }
+    } else {
+        i = 0;
+    unquant_even:
+        quant_matrix = s->non_intra_matrix;
+	/* Align on 4 elements boundary */
+	while(i&3)
+	{
+	    level = block[i];
+            if (level) {
+                if (level < 0) level = -level;
+                    level = (((level << 1) + 1) * qscale *
+                             ((int) quant_matrix[i])) >> 4;
+                    level = (level - 1) | 1;
+                if(block[i] < 0) level = -level;
+                block[i] = level;
+	    }
+	    i++;
+	}
+	__asm __volatile(
+	"movd	%0, %%mm6\n\t"       /* mm6 = qscale | 0  */
+	"punpckldq %%mm6, %%mm6\n\t" /* mm6 = qscale | qscale */
+	"movq	%2, %%mm4\n\t"
+	"movq	%%mm6, %%mm7\n\t"
+	"movq	%1, %%mm5\n\t"
+	"packssdw %%mm6, %%mm7\n\t" /* mm7 = qscale | qscale | qscale | qscale */
+	"pxor	%%mm6, %%mm6\n\t"
+	::"g"(qscale),"m"(mm_wone),"m"(mm_wabs):"memory");
+        for(;i<64;i+=4) {
+		__asm __volatile(
+			"movq	%1, %%mm0\n\t"
+			"movq	%%mm7, %%mm1\n\t"
+			"movq	%%mm0, %%mm2\n\t"
+			"movq	%%mm0, %%mm3\n\t"
+			"pcmpgtw %%mm6, %%mm2\n\t"
+			"pmullw	%2, %%mm1\n\t"
+			"pandn	%%mm4, %%mm2\n\t"
+			"por	%%mm5, %%mm2\n\t"  
+			"pmullw	%%mm2, %%mm0\n\t" /* mm0 = abs(block[i]). */
+			"psllw	$1, %%mm0\n\t" /* block[i] <<= 1 */
+			"paddw	%%mm5, %%mm0\n\t" /* block[i] ++ */
+			
+			"pmullw	%%mm0, %%mm1\n\t"
+			"psraw	$4, %%mm1\n\t"
+			"pcmpeqw %%mm6, %%mm3\n\t"
+			"psubw	%%mm5, %%mm1\n\t"   /* block[i] --; */
+			"pandn	%%mm4, %%mm3\n\t"  /* fake of pcmpneqw : mm0 != 0 then mm1 = -1 */
+			"por	%%mm5, %%mm1\n\t"   /* block[i] |= 1 */
+			"pmullw %%mm2, %%mm1\n\t"   /* change signs again */
+
+			"pand	%%mm3, %%mm1\n\t" /* nullify if was zero */
+			"movq	%%mm1, %0"
+			:"=m"(block[i])
+			:"m"(block[i]), "m"(quant_matrix[i])
+			:"memory");
+        }
+    }
+}
+
+void MPV_common_init_mmx(MpegEncContext *s)
+{
+    if (mm_flags & MM_MMX) {
+        /* XXX: should include h263 optimization too. It would go even
+           faster! */
+        s->dct_unquantize = dct_unquantize_mpeg1_mmx;
+    }
+}