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Diffstat (limited to 'libavcodec/mips/mpegvideo_mmi.c')
-rw-r--r--libavcodec/mips/mpegvideo_mmi.c87
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;
+}