Bink video decoder

Originally committed as revision 21937 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 112 insertions, 0 deletions

diff --git a/libavcodec/binkidct.c b/libavcodec/binkidct.c
new file mode 100644
index 0000000000..6139557668
--- /dev/null
+++ b/libavcodec/binkidct.c
@@ -0,0 +1,112 @@
+/*
+ * Bink IDCT algorithm
+ * Copyright (c) 2009 Kostya Shishkov
+ *
+ * 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
+ */
+
+/**
+ * @file libavcodec/binkidct.c
+ * Bink IDCT algorithm
+ */
+
+#include "dsputil.h"
+
+#define A1  2896 /* (1/sqrt(2))<<12 */
+#define A2  2217
+#define A3  3784
+#define A4 -5352
+
+#define IDCT_TRANSFORM(dest,s0,s1,s2,s3,s4,s5,s6,s7,d0,d1,d2,d3,d4,d5,d6,d7,munge,src) {\
+    const int a0 = (src)[s0] + (src)[s4]; \
+    const int a1 = (src)[s0] - (src)[s4]; \
+    const int a2 = (src)[s2] + (src)[s6]; \
+    const int a3 = (A1*((src)[s2] - (src)[s6])) >> 11; \
+    const int a4 = (src)[s5] + (src)[s3]; \
+    const int a5 = (src)[s5] - (src)[s3]; \
+    const int a6 = (src)[s1] + (src)[s7]; \
+    const int a7 = (src)[s1] - (src)[s7]; \
+    const int b0 = a4 + a6; \
+    const int b1 = (A3*(a5 + a7)) >> 11; \
+    const int b2 = ((A4*a5) >> 11) - b0 + b1; \
+    const int b3 = (A1*(a6 - a4) >> 11) - b2; \
+    const int b4 = ((A2*a7) >> 11) + b3 - b1; \
+    (dest)[d0] = munge(a0+a2   +b0); \
+    (dest)[d1] = munge(a1+a3-a2+b2); \
+    (dest)[d2] = munge(a1-a3+a2+b3); \
+    (dest)[d3] = munge(a0-a2   -b4); \
+    (dest)[d4] = munge(a0-a2   +b4); \
+    (dest)[d5] = munge(a1-a3+a2-b3); \
+    (dest)[d6] = munge(a1+a3-a2-b2); \
+    (dest)[d7] = munge(a0+a2   -b0); \
+}
+/* end IDCT_TRANSFORM macro */
+
+#define MUNGE_NONE(x) (x)
+#define IDCT_COL(dest,src) IDCT_TRANSFORM(dest,0,8,16,24,32,40,48,56,0,8,16,24,32,40,48,56,MUNGE_NONE,src)
+
+#define MUNGE_ROW(x) (((x) + 0x7F)>>8)
+#define IDCT_ROW(dest,src) IDCT_TRANSFORM(dest,0,1,2,3,4,5,6,7,0,1,2,3,4,5,6,7,MUNGE_ROW,src)
+
+static inline void bink_idct_col(DCTELEM *dest, const DCTELEM *src)
+{
+    if ((src[8]|src[16]|src[24]|src[32]|src[40]|src[48]|src[56])==0) {
+        dest[0]  =
+        dest[8]  =
+        dest[16] =
+        dest[24] =
+        dest[32] =
+        dest[40] =
+        dest[48] =
+        dest[56] = src[0];
+    } else {
+        IDCT_COL(dest, src);
+    }
+}
+
+void ff_bink_idct_c(DCTELEM *block)
+{
+    int i;
+    DCTELEM temp[64];
+
+    for (i = 0; i < 8; i++)
+        bink_idct_col(&temp[i], &block[i]);
+    for (i = 0; i < 8; i++) {
+        IDCT_ROW( (&block[8*i]), (&temp[8*i]) );
+    }
+}
+
+void ff_bink_idct_add_c(uint8_t *dest, int linesize, DCTELEM *block)
+{
+    int i, j;
+
+    ff_bink_idct_c(block);
+    for (i = 0; i < 8; i++, dest += linesize, block += 8)
+        for (j = 0; j < 8; j++)
+             dest[j] += block[j];
+}
+
+void ff_bink_idct_put_c(uint8_t *dest, int linesize, DCTELEM *block)
+{
+    int i;
+    DCTELEM temp[64];
+    for (i = 0; i < 8; i++)
+        bink_idct_col(&temp[i], &block[i]);
+    for (i = 0; i < 8; i++) {
+        IDCT_ROW( (&dest[i*linesize]), (&temp[8*i]) );
+    }
+}