LucasArts SMUSH SANM video decoder

Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>

1 files changed, 1475 insertions, 0 deletions

diff --git a/libavcodec/sanm.c b/libavcodec/sanm.c
new file mode 100644
index 0000000000..9f2f22b3a8
--- /dev/null
+++ b/libavcodec/sanm.c
@@ -0,0 +1,1475 @@
+/*
+ * LucasArts Smush video decoder
+ * Copyright (c) 2006 Cyril Zorin
+ * Copyright (c) 2011 Konstantin Shishkov
+ *
+ * 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 "libavutil/avassert.h"
+#include "libavutil/bswap.h"
+#include "libavutil/imgutils.h"
+
+#include "avcodec.h"
+#include "bytestream.h"
+#include "copy_block.h"
+#include "internal.h"
+
+#define NGLYPHS 256
+#define GLYPH_COORD_VECT_SIZE 16
+#define PALETTE_SIZE 256
+#define PALETTE_DELTA 768
+
+static const int8_t glyph4_x[GLYPH_COORD_VECT_SIZE] = {
+    0, 1, 2, 3, 3, 3, 3, 2, 1, 0, 0, 0, 1, 2, 2, 1
+};
+
+static const int8_t glyph4_y[GLYPH_COORD_VECT_SIZE] = {
+    0, 0, 0, 0, 1, 2, 3, 3, 3, 3, 2, 1, 1, 1, 2, 2
+};
+
+static const int8_t glyph8_x[GLYPH_COORD_VECT_SIZE] = {
+    0, 2, 5, 7, 7, 7, 7, 7, 7, 5, 2, 0, 0, 0, 0, 0
+};
+
+static const int8_t glyph8_y[GLYPH_COORD_VECT_SIZE] = {
+    0, 0, 0, 0, 1, 3, 4, 6, 7, 7, 7, 7, 6, 4, 3, 1
+};
+
+static const int8_t motion_vectors[256][2] = {
+    {   0,   0 }, {  -1, -43 }, {   6, -43 }, {  -9, -42 }, {  13, -41 },
+    { -16, -40 }, {  19, -39 }, { -23, -36 }, {  26, -34 }, {  -2, -33 },
+    {   4, -33 }, { -29, -32 }, {  -9, -32 }, {  11, -31 }, { -16, -29 },
+    {  32, -29 }, {  18, -28 }, { -34, -26 }, { -22, -25 }, {  -1, -25 },
+    {   3, -25 }, {  -7, -24 }, {   8, -24 }, {  24, -23 }, {  36, -23 },
+    { -12, -22 }, {  13, -21 }, { -38, -20 }, {   0, -20 }, { -27, -19 },
+    {  -4, -19 }, {   4, -19 }, { -17, -18 }, {  -8, -17 }, {   8, -17 },
+    {  18, -17 }, {  28, -17 }, {  39, -17 }, { -12, -15 }, {  12, -15 },
+    { -21, -14 }, {  -1, -14 }, {   1, -14 }, { -41, -13 }, {  -5, -13 },
+    {   5, -13 }, {  21, -13 }, { -31, -12 }, { -15, -11 }, {  -8, -11 },
+    {   8, -11 }, {  15, -11 }, {  -2, -10 }, {   1, -10 }, {  31, -10 },
+    { -23,  -9 }, { -11,  -9 }, {  -5,  -9 }, {   4,  -9 }, {  11,  -9 },
+    {  42,  -9 }, {   6,  -8 }, {  24,  -8 }, { -18,  -7 }, {  -7,  -7 },
+    {  -3,  -7 }, {  -1,  -7 }, {   2,  -7 }, {  18,  -7 }, { -43,  -6 },
+    { -13,  -6 }, {  -4,  -6 }, {   4,  -6 }, {   8,  -6 }, { -33,  -5 },
+    {  -9,  -5 }, {  -2,  -5 }, {   0,  -5 }, {   2,  -5 }, {   5,  -5 },
+    {  13,  -5 }, { -25,  -4 }, {  -6,  -4 }, {  -3,  -4 }, {   3,  -4 },
+    {   9,  -4 }, { -19,  -3 }, {  -7,  -3 }, {  -4,  -3 }, {  -2,  -3 },
+    {  -1,  -3 }, {   0,  -3 }, {   1,  -3 }, {   2,  -3 }, {   4,  -3 },
+    {   6,  -3 }, {  33,  -3 }, { -14,  -2 }, { -10,  -2 }, {  -5,  -2 },
+    {  -3,  -2 }, {  -2,  -2 }, {  -1,  -2 }, {   0,  -2 }, {   1,  -2 },
+    {   2,  -2 }, {   3,  -2 }, {   5,  -2 }, {   7,  -2 }, {  14,  -2 },
+    {  19,  -2 }, {  25,  -2 }, {  43,  -2 }, {  -7,  -1 }, {  -3,  -1 },
+    {  -2,  -1 }, {  -1,  -1 }, {   0,  -1 }, {   1,  -1 }, {   2,  -1 },
+    {   3,  -1 }, {  10,  -1 }, {  -5,   0 }, {  -3,   0 }, {  -2,   0 },
+    {  -1,   0 }, {   1,   0 }, {   2,   0 }, {   3,   0 }, {   5,   0 },
+    {   7,   0 }, { -10,   1 }, {  -7,   1 }, {  -3,   1 }, {  -2,   1 },
+    {  -1,   1 }, {   0,   1 }, {   1,   1 }, {   2,   1 }, {   3,   1 },
+    { -43,   2 }, { -25,   2 }, { -19,   2 }, { -14,   2 }, {  -5,   2 },
+    {  -3,   2 }, {  -2,   2 }, {  -1,   2 }, {   0,   2 }, {   1,   2 },
+    {   2,   2 }, {   3,   2 }, {   5,   2 }, {   7,   2 }, {  10,   2 },
+    {  14,   2 }, { -33,   3 }, {  -6,   3 }, {  -4,   3 }, {  -2,   3 },
+    {  -1,   3 }, {   0,   3 }, {   1,   3 }, {   2,   3 }, {   4,   3 },
+    {  19,   3 }, {  -9,   4 }, {  -3,   4 }, {   3,   4 }, {   7,   4 },
+    {  25,   4 }, { -13,   5 }, {  -5,   5 }, {  -2,   5 }, {   0,   5 },
+    {   2,   5 }, {   5,   5 }, {   9,   5 }, {  33,   5 }, {  -8,   6 },
+    {  -4,   6 }, {   4,   6 }, {  13,   6 }, {  43,   6 }, { -18,   7 },
+    {  -2,   7 }, {   0,   7 }, {   2,   7 }, {   7,   7 }, {  18,   7 },
+    { -24,   8 }, {  -6,   8 }, { -42,   9 }, { -11,   9 }, {  -4,   9 },
+    {   5,   9 }, {  11,   9 }, {  23,   9 }, { -31,  10 }, {  -1,  10 },
+    {   2,  10 }, { -15,  11 }, {  -8,  11 }, {   8,  11 }, {  15,  11 },
+    {  31,  12 }, { -21,  13 }, {  -5,  13 }, {   5,  13 }, {  41,  13 },
+    {  -1,  14 }, {   1,  14 }, {  21,  14 }, { -12,  15 }, {  12,  15 },
+    { -39,  17 }, { -28,  17 }, { -18,  17 }, {  -8,  17 }, {   8,  17 },
+    {  17,  18 }, {  -4,  19 }, {   0,  19 }, {   4,  19 }, {  27,  19 },
+    {  38,  20 }, { -13,  21 }, {  12,  22 }, { -36,  23 }, { -24,  23 },
+    {  -8,  24 }, {   7,  24 }, {  -3,  25 }, {   1,  25 }, {  22,  25 },
+    {  34,  26 }, { -18,  28 }, { -32,  29 }, {  16,  29 }, { -11,  31 },
+    {   9,  32 }, {  29,  32 }, {  -4,  33 }, {   2,  33 }, { -26,  34 },
+    {  23,  36 }, { -19,  39 }, {  16,  40 }, { -13,  41 }, {   9,  42 },
+    {  -6,  43 }, {   1,  43 }, {   0,   0 }, {   0,   0 }, {   0,   0 },
+};
+
+static const int8_t c37_mv[] = {
+    0,   0,   1,   0,   2,   0,   3,   0,   5,   0,   8,   0,  13,   0,  21,
+    0,  -1,   0,  -2,   0,  -3,   0,  -5,   0,  -8,   0, -13,   0, -17,   0,
+  -21,   0,   0,   1,   1,   1,   2,   1,   3,   1,   5,   1,   8,   1,  13,
+    1,  21,   1,  -1,   1,  -2,   1,  -3,   1,  -5,   1,  -8,   1, -13,   1,
+  -17,   1, -21,   1,   0,   2,   1,   2,   2,   2,   3,   2,   5,   2,   8,
+    2,  13,   2,  21,   2,  -1,   2,  -2,   2,  -3,   2,  -5,   2,  -8,   2,
+  -13,   2, -17,   2, -21,   2,   0,   3,   1,   3,   2,   3,   3,   3,   5,
+    3,   8,   3,  13,   3,  21,   3,  -1,   3,  -2,   3,  -3,   3,  -5,   3,
+   -8,   3, -13,   3, -17,   3, -21,   3,   0,   5,   1,   5,   2,   5,   3,
+    5,   5,   5,   8,   5,  13,   5,  21,   5,  -1,   5,  -2,   5,  -3,   5,
+   -5,   5,  -8,   5, -13,   5, -17,   5, -21,   5,   0,   8,   1,   8,   2,
+    8,   3,   8,   5,   8,   8,   8,  13,   8,  21,   8,  -1,   8,  -2,   8,
+   -3,   8,  -5,   8,  -8,   8, -13,   8, -17,   8, -21,   8,   0,  13,   1,
+   13,   2,  13,   3,  13,   5,  13,   8,  13,  13,  13,  21,  13,  -1,  13,
+   -2,  13,  -3,  13,  -5,  13,  -8,  13, -13,  13, -17,  13, -21,  13,   0,
+   21,   1,  21,   2,  21,   3,  21,   5,  21,   8,  21,  13,  21,  21,  21,
+   -1,  21,  -2,  21,  -3,  21,  -5,  21,  -8,  21, -13,  21, -17,  21, -21,
+   21,   0,  -1,   1,  -1,   2,  -1,   3,  -1,   5,  -1,   8,  -1,  13,  -1,
+   21,  -1,  -1,  -1,  -2,  -1,  -3,  -1,  -5,  -1,  -8,  -1, -13,  -1, -17,
+   -1, -21,  -1,   0,  -2,   1,  -2,   2,  -2,   3,  -2,   5,  -2,   8,  -2,
+   13,  -2,  21,  -2,  -1,  -2,  -2,  -2,  -3,  -2,  -5,  -2,  -8,  -2, -13,
+   -2, -17,  -2, -21,  -2,   0,  -3,   1,  -3,   2,  -3,   3,  -3,   5,  -3,
+    8,  -3,  13,  -3,  21,  -3,  -1,  -3,  -2,  -3,  -3,  -3,  -5,  -3,  -8,
+   -3, -13,  -3, -17,  -3, -21,  -3,   0,  -5,   1,  -5,   2,  -5,   3,  -5,
+    5,  -5,   8,  -5,  13,  -5,  21,  -5,  -1,  -5,  -2,  -5,  -3,  -5,  -5,
+   -5,  -8,  -5, -13,  -5, -17,  -5, -21,  -5,   0,  -8,   1,  -8,   2,  -8,
+    3,  -8,   5,  -8,   8,  -8,  13,  -8,  21,  -8,  -1,  -8,  -2,  -8,  -3,
+   -8,  -5,  -8,  -8,  -8, -13,  -8, -17,  -8, -21,  -8,   0, -13,   1, -13,
+    2, -13,   3, -13,   5, -13,   8, -13,  13, -13,  21, -13,  -1, -13,  -2,
+  -13,  -3, -13,  -5, -13,  -8, -13, -13, -13, -17, -13, -21, -13,   0, -17,
+    1, -17,   2, -17,   3, -17,   5, -17,   8, -17,  13, -17,  21, -17,  -1,
+  -17,  -2, -17,  -3, -17,  -5, -17,  -8, -17, -13, -17, -17, -17, -21, -17,
+    0, -21,   1, -21,   2, -21,   3, -21,   5, -21,   8, -21,  13, -21,  21,
+  -21,  -1, -21,  -2, -21,  -3, -21,  -5, -21,  -8, -21, -13, -21, -17, -21,
+    0,   0,  -8, -29,   8, -29, -18, -25,  17, -25,   0, -23,  -6, -22,   6,
+  -22, -13, -19,  12, -19,   0, -18,  25, -18, -25, -17,  -5, -17,   5, -17,
+  -10, -15,  10, -15,   0, -14,  -4, -13,   4, -13,  19, -13, -19, -12,  -8,
+  -11,  -2, -11,   0, -11,   2, -11,   8, -11, -15, -10,  -4, -10,   4, -10,
+   15, -10,  -6,  -9,  -1,  -9,   1,  -9,   6,  -9, -29,  -8, -11,  -8,  -8,
+   -8,  -3,  -8,   3,  -8,   8,  -8,  11,  -8,  29,  -8,  -5,  -7,  -2,  -7,
+    0,  -7,   2,  -7,   5,  -7, -22,  -6,  -9,  -6,  -6,  -6,  -3,  -6,  -1,
+   -6,   1,  -6,   3,  -6,   6,  -6,   9,  -6,  22,  -6, -17,  -5,  -7,  -5,
+   -4,  -5,  -2,  -5,   0,  -5,   2,  -5,   4,  -5,   7,  -5,  17,  -5, -13,
+   -4, -10,  -4,  -5,  -4,  -3,  -4,  -1,  -4,   0,  -4,   1,  -4,   3,  -4,
+    5,  -4,  10,  -4,  13,  -4,  -8,  -3,  -6,  -3,  -4,  -3,  -3,  -3,  -2,
+   -3,  -1,  -3,   0,  -3,   1,  -3,   2,  -3,   4,  -3,   6,  -3,   8,  -3,
+  -11,  -2,  -7,  -2,  -5,  -2,  -3,  -2,  -2,  -2,  -1,  -2,   0,  -2,   1,
+   -2,   2,  -2,   3,  -2,   5,  -2,   7,  -2,  11,  -2,  -9,  -1,  -6,  -1,
+   -4,  -1,  -3,  -1,  -2,  -1,  -1,  -1,   0,  -1,   1,  -1,   2,  -1,   3,
+   -1,   4,  -1,   6,  -1,   9,  -1, -31,   0, -23,   0, -18,   0, -14,   0,
+  -11,   0,  -7,   0,  -5,   0,  -4,   0,  -3,   0,  -2,   0,  -1,   0,   0,
+  -31,   1,   0,   2,   0,   3,   0,   4,   0,   5,   0,   7,   0,  11,   0,
+   14,   0,  18,   0,  23,   0,  31,   0,  -9,   1,  -6,   1,  -4,   1,  -3,
+    1,  -2,   1,  -1,   1,   0,   1,   1,   1,   2,   1,   3,   1,   4,   1,
+    6,   1,   9,   1, -11,   2,  -7,   2,  -5,   2,  -3,   2,  -2,   2,  -1,
+    2,   0,   2,   1,   2,   2,   2,   3,   2,   5,   2,   7,   2,  11,   2,
+   -8,   3,  -6,   3,  -4,   3,  -2,   3,  -1,   3,   0,   3,   1,   3,   2,
+    3,   3,   3,   4,   3,   6,   3,   8,   3, -13,   4, -10,   4,  -5,   4,
+   -3,   4,  -1,   4,   0,   4,   1,   4,   3,   4,   5,   4,  10,   4,  13,
+    4, -17,   5,  -7,   5,  -4,   5,  -2,   5,   0,   5,   2,   5,   4,   5,
+    7,   5,  17,   5, -22,   6,  -9,   6,  -6,   6,  -3,   6,  -1,   6,   1,
+    6,   3,   6,   6,   6,   9,   6,  22,   6,  -5,   7,  -2,   7,   0,   7,
+    2,   7,   5,   7, -29,   8, -11,   8,  -8,   8,  -3,   8,   3,   8,   8,
+    8,  11,   8,  29,   8,  -6,   9,  -1,   9,   1,   9,   6,   9, -15,  10,
+   -4,  10,   4,  10,  15,  10,  -8,  11,  -2,  11,   0,  11,   2,  11,   8,
+   11,  19,  12, -19,  13,  -4,  13,   4,  13,   0,  14, -10,  15,  10,  15,
+   -5,  17,   5,  17,  25,  17, -25,  18,   0,  18, -12,  19,  13,  19,  -6,
+   22,   6,  22,   0,  23, -17,  25,  18,  25,  -8,  29,   8,  29,   0,  31,
+    0,   0,  -6, -22,   6, -22, -13, -19,  12, -19,   0, -18,  -5, -17,   5,
+  -17, -10, -15,  10, -15,   0, -14,  -4, -13,   4, -13,  19, -13, -19, -12,
+   -8, -11,  -2, -11,   0, -11,   2, -11,   8, -11, -15, -10,  -4, -10,   4,
+  -10,  15, -10,  -6,  -9,  -1,  -9,   1,  -9,   6,  -9, -11,  -8,  -8,  -8,
+   -3,  -8,   0,  -8,   3,  -8,   8,  -8,  11,  -8,  -5,  -7,  -2,  -7,   0,
+   -7,   2,  -7,   5,  -7, -22,  -6,  -9,  -6,  -6,  -6,  -3,  -6,  -1,  -6,
+    1,  -6,   3,  -6,   6,  -6,   9,  -6,  22,  -6, -17,  -5,  -7,  -5,  -4,
+   -5,  -2,  -5,  -1,  -5,   0,  -5,   1,  -5,   2,  -5,   4,  -5,   7,  -5,
+   17,  -5, -13,  -4, -10,  -4,  -5,  -4,  -3,  -4,  -2,  -4,  -1,  -4,   0,
+   -4,   1,  -4,   2,  -4,   3,  -4,   5,  -4,  10,  -4,  13,  -4,  -8,  -3,
+   -6,  -3,  -4,  -3,  -3,  -3,  -2,  -3,  -1,  -3,   0,  -3,   1,  -3,   2,
+   -3,   3,  -3,   4,  -3,   6,  -3,   8,  -3, -11,  -2,  -7,  -2,  -5,  -2,
+   -4,  -2,  -3,  -2,  -2,  -2,  -1,  -2,   0,  -2,   1,  -2,   2,  -2,   3,
+   -2,   4,  -2,   5,  -2,   7,  -2,  11,  -2,  -9,  -1,  -6,  -1,  -5,  -1,
+   -4,  -1,  -3,  -1,  -2,  -1,  -1,  -1,   0,  -1,   1,  -1,   2,  -1,   3,
+   -1,   4,  -1,   5,  -1,   6,  -1,   9,  -1, -23,   0, -18,   0, -14,   0,
+  -11,   0,  -7,   0,  -5,   0,  -4,   0,  -3,   0,  -2,   0,  -1,   0,   0,
+  -23,   1,   0,   2,   0,   3,   0,   4,   0,   5,   0,   7,   0,  11,   0,
+   14,   0,  18,   0,  23,   0,  -9,   1,  -6,   1,  -5,   1,  -4,   1,  -3,
+    1,  -2,   1,  -1,   1,   0,   1,   1,   1,   2,   1,   3,   1,   4,   1,
+    5,   1,   6,   1,   9,   1, -11,   2,  -7,   2,  -5,   2,  -4,   2,  -3,
+    2,  -2,   2,  -1,   2,   0,   2,   1,   2,   2,   2,   3,   2,   4,   2,
+    5,   2,   7,   2,  11,   2,  -8,   3,  -6,   3,  -4,   3,  -3,   3,  -2,
+    3,  -1,   3,   0,   3,   1,   3,   2,   3,   3,   3,   4,   3,   6,   3,
+    8,   3, -13,   4, -10,   4,  -5,   4,  -3,   4,  -2,   4,  -1,   4,   0,
+    4,   1,   4,   2,   4,   3,   4,   5,   4,  10,   4,  13,   4, -17,   5,
+   -7,   5,  -4,   5,  -2,   5,  -1,   5,   0,   5,   1,   5,   2,   5,   4,
+    5,   7,   5,  17,   5, -22,   6,  -9,   6,  -6,   6,  -3,   6,  -1,   6,
+    1,   6,   3,   6,   6,   6,   9,   6,  22,   6,  -5,   7,  -2,   7,   0,
+    7,   2,   7,   5,   7, -11,   8,  -8,   8,  -3,   8,   0,   8,   3,   8,
+    8,   8,  11,   8,  -6,   9,  -1,   9,   1,   9,   6,   9, -15,  10,  -4,
+   10,   4,  10,  15,  10,  -8,  11,  -2,  11,   0,  11,   2,  11,   8,  11,
+   19,  12, -19,  13,  -4,  13,   4,  13,   0,  14, -10,  15,  10,  15,  -5,
+   17,   5,  17,   0,  18, -12,  19,  13,  19,  -6,  22,   6,  22,   0,  23,
+};
+
+typedef struct SANMVideoContext {
+    AVCodecContext *avctx;
+    GetByteContext gb;
+
+    int version, subversion;
+    uint32_t pal[PALETTE_SIZE];
+    int16_t delta_pal[PALETTE_DELTA];
+
+    int pitch;
+    int width, height;
+    int aligned_width, aligned_height;
+    int prev_seq;
+
+    AVFrame *frame;
+    uint16_t *frm0, *frm1, *frm2;
+    uint8_t *stored_frame;
+    uint32_t frm0_size, frm1_size, frm2_size;
+    uint32_t stored_frame_size;
+
+    uint8_t *rle_buf;
+    unsigned int rle_buf_size;
+
+    int rotate_code;
+
+    long npixels, buf_size;
+
+    uint16_t codebook[256];
+    uint16_t small_codebook[4];
+
+    int8_t p4x4glyphs[NGLYPHS][16];
+    int8_t p8x8glyphs[NGLYPHS][64];
+} SANMVideoContext;
+
+typedef struct SANMFrameHeader {
+    int seq_num, codec, rotate_code, rle_output_size;
+
+    uint16_t bg_color;
+    uint32_t width, height;
+} SANMFrameHeader;
+
+enum GlyphEdge {
+    LEFT_EDGE,
+    TOP_EDGE,
+    RIGHT_EDGE,
+    BOTTOM_EDGE,
+    NO_EDGE
+};
+
+enum GlyphDir {
+    DIR_LEFT,
+    DIR_UP,
+    DIR_RIGHT,
+    DIR_DOWN,
+    NO_DIR
+};
+
+/**
+ * Return enum GlyphEdge of box where point (x, y) lies.
+ *
+ * @param x x point coordinate
+ * @param y y point coordinate
+ * @param edge_size box width/height.
+ */
+static enum GlyphEdge which_edge(int x, int y, int edge_size)
+{
+    const int edge_max = edge_size - 1;
+
+    if (!y)
+        return BOTTOM_EDGE;
+    else if (y == edge_max)
+        return TOP_EDGE;
+    else if (!x)
+        return LEFT_EDGE;
+    else if (x == edge_max)
+        return RIGHT_EDGE;
+    else
+        return NO_EDGE;
+}
+
+static enum GlyphDir which_direction(enum GlyphEdge edge0, enum GlyphEdge edge1)
+{
+    if ((edge0 == LEFT_EDGE && edge1 == RIGHT_EDGE) ||
+        (edge1 == LEFT_EDGE && edge0 == RIGHT_EDGE) ||
+        (edge0 == BOTTOM_EDGE && edge1 != TOP_EDGE) ||
+        (edge1 == BOTTOM_EDGE && edge0 != TOP_EDGE))
+        return DIR_UP;
+    else if ((edge0 == TOP_EDGE && edge1 != BOTTOM_EDGE) ||
+             (edge1 == TOP_EDGE && edge0 != BOTTOM_EDGE))
+        return DIR_DOWN;
+    else if ((edge0 == LEFT_EDGE && edge1 != RIGHT_EDGE) ||
+             (edge1 == LEFT_EDGE && edge0 != RIGHT_EDGE))
+        return DIR_LEFT;
+    else if ((edge0 == TOP_EDGE && edge1 == BOTTOM_EDGE) ||
+             (edge1 == TOP_EDGE && edge0 == BOTTOM_EDGE) ||
+             (edge0 == RIGHT_EDGE && edge1 != LEFT_EDGE) ||
+             (edge1 == RIGHT_EDGE && edge0 != LEFT_EDGE))
+        return DIR_RIGHT;
+
+    return NO_DIR;
+}
+
+/* Interpolate two points. */
+static void interp_point(int8_t *points, int x0, int y0, int x1, int y1,
+                         int pos, int npoints)
+{
+    if (npoints) {
+        points[0] = (x0 * pos + x1 * (npoints - pos) + (npoints >> 1)) / npoints;
+        points[1] = (y0 * pos + y1 * (npoints - pos) + (npoints >> 1)) / npoints;
+    } else {
+        points[0] = x0;
+        points[1] = y0;
+    }
+}
+
+/**
+ * Construct glyphs by iterating through vector coordinates.
+ *
+ * @param pglyphs pointer to table where glyphs are stored
+ * @param xvec pointer to x component of vector coordinates
+ * @param yvec pointer to y component of vector coordinates
+ * @param side_length glyph width/height.
+ */
+static void make_glyphs(int8_t *pglyphs, const int8_t *xvec, const int8_t *yvec,
+                        const int side_length)
+{
+    const int glyph_size = side_length * side_length;
+    int8_t *pglyph = pglyphs;
+
+    int i, j;
+    for (i = 0; i < GLYPH_COORD_VECT_SIZE; i++) {
+        int x0 = xvec[i];
+        int y0 = yvec[i];
+        enum GlyphEdge edge0 = which_edge(x0, y0, side_length);
+
+        for (j = 0; j < GLYPH_COORD_VECT_SIZE; j++, pglyph += glyph_size) {
+            int x1 = xvec[j];
+            int y1 = yvec[j];
+            enum GlyphEdge edge1 = which_edge(x1, y1, side_length);
+            enum GlyphDir dir = which_direction(edge0, edge1);
+            int npoints = FFMAX(FFABS(x1 - x0), FFABS(y1 - y0));
+            int ipoint;
+
+            for (ipoint = 0; ipoint <= npoints; ipoint++) {
+                int8_t point[2];
+                int irow, icol;
+
+                interp_point(point, x0, y0, x1, y1, ipoint, npoints);
+
+                switch (dir) {
+                case DIR_UP:
+                    for (irow = point[1]; irow >= 0; irow--)
+                        pglyph[point[0] + irow * side_length] = 1;
+                    break;
+
+                case DIR_DOWN:
+                    for (irow = point[1]; irow < side_length; irow++)
+                        pglyph[point[0] + irow * side_length] = 1;
+                    break;
+
+                case DIR_LEFT:
+                    for (icol = point[0]; icol >= 0; icol--)
+                        pglyph[icol + point[1] * side_length] = 1;
+                    break;
+
+                case DIR_RIGHT:
+                    for (icol = point[0]; icol < side_length; icol++)
+                        pglyph[icol + point[1] * side_length] = 1;
+                    break;
+                }
+            }
+        }
+    }
+}
+
+static void init_sizes(SANMVideoContext *ctx, int width, int height)
+{
+    ctx->width   = width;
+    ctx->height  = height;
+    ctx->npixels = width * height;
+
+    ctx->aligned_width  = FFALIGN(width, 8);
+    ctx->aligned_height = FFALIGN(height, 8);
+
+    ctx->buf_size = ctx->aligned_width * ctx->aligned_height * sizeof(ctx->frm0[0]);
+    ctx->pitch    = width;
+}
+
+static void destroy_buffers(SANMVideoContext *ctx)
+{
+    av_freep(&ctx->frm0);
+    av_freep(&ctx->frm1);
+    av_freep(&ctx->frm2);
+    av_freep(&ctx->stored_frame);
+    av_freep(&ctx->rle_buf);
+    ctx->frm0_size =
+    ctx->frm1_size =
+    ctx->frm2_size = 0;
+}
+
+static av_cold int init_buffers(SANMVideoContext *ctx)
+{
+    av_fast_padded_malloc(&ctx->frm0, &ctx->frm0_size, ctx->buf_size);
+    av_fast_padded_malloc(&ctx->frm1, &ctx->frm1_size, ctx->buf_size);
+    av_fast_padded_malloc(&ctx->frm2, &ctx->frm2_size, ctx->buf_size);
+    if (!ctx->version)
+        av_fast_padded_malloc(&ctx->stored_frame,
+                              &ctx->stored_frame_size, ctx->buf_size);
+
+    if (!ctx->frm0 || !ctx->frm1 || !ctx->frm2 ||
+        (!ctx->stored_frame && !ctx->version)) {
+        destroy_buffers(ctx);
+        return AVERROR(ENOMEM);
+    }
+
+    return 0;
+}
+
+static void rotate_bufs(SANMVideoContext *ctx, int rotate_code)
+{
+    if (rotate_code == 2)
+        FFSWAP(uint16_t*, ctx->frm1, ctx->frm2);
+    FFSWAP(uint16_t*, ctx->frm2, ctx->frm0);
+}
+
+static av_cold int decode_init(AVCodecContext *avctx)
+{
+    SANMVideoContext *ctx = avctx->priv_data;
+
+    ctx->avctx   = avctx;
+    ctx->version = !avctx->extradata_size;
+
+    avctx->pix_fmt = ctx->version ? AV_PIX_FMT_RGB565 : AV_PIX_FMT_PAL8;
+
+    init_sizes(ctx, avctx->width, avctx->height);
+    if (init_buffers(ctx)) {
+        av_log(avctx, AV_LOG_ERROR, "Error allocating buffers.\n");
+        return AVERROR(ENOMEM);
+    }
+
+    make_glyphs(ctx->p4x4glyphs[0], glyph4_x, glyph4_y, 4);
+    make_glyphs(ctx->p8x8glyphs[0], glyph8_x, glyph8_y, 8);
+
+    if (!ctx->version) {
+        int i;
+
+        if (avctx->extradata_size < 1026) {
+            av_log(avctx, AV_LOG_ERROR, "Not enough extradata.\n");
+            return AVERROR_INVALIDDATA;
+        }
+
+        ctx->subversion = AV_RL16(avctx->extradata);
+        for (i = 0; i < 256; i++)
+            ctx->pal[i] = 0xFFU << 24 | AV_RL32(avctx->extradata + 2 + i * 4);
+    }
+
+    return 0;
+}
+
+static av_cold int decode_end(AVCodecContext *avctx)
+{
+    SANMVideoContext *ctx = avctx->priv_data;
+
+    destroy_buffers(ctx);
+
+    return 0;
+}
+
+static int rle_decode(SANMVideoContext *ctx, uint8_t *dst, const int out_size)
+{
+    int opcode, color, run_len, left = out_size;
+
+    while (left > 0) {
+        opcode = bytestream2_get_byte(&ctx->gb);
+        run_len = (opcode >> 1) + 1;
+        if (run_len > left || bytestream2_get_bytes_left(&ctx->gb) <= 0)
+            return AVERROR_INVALIDDATA;
+
+        if (opcode & 1) {
+            color = bytestream2_get_byte(&ctx->gb);
+            memset(dst, color, run_len);
+        } else {
+            if (bytestream2_get_bytes_left(&ctx->gb) < run_len)
+                return AVERROR_INVALIDDATA;
+            bytestream2_get_bufferu(&ctx->gb, dst, run_len);
+        }
+
+        dst  += run_len;
+        left -= run_len;
+    }
+
+    return 0;
+}
+
+static int old_codec1(SANMVideoContext *ctx, int top,
+                      int left, int width, int height)
+{
+    uint8_t *dst = ((uint8_t *)ctx->frm0) + left + top * ctx->pitch;
+    int i, j, len, flag, code, val, pos, end;
+
+    for (i = 0; i < height; i++) {
+        pos = 0;
+
+        if (bytestream2_get_bytes_left(&ctx->gb) < 2)
+            return AVERROR_INVALIDDATA;
+
+        len = bytestream2_get_le16u(&ctx->gb);
+        end = bytestream2_tell(&ctx->gb) + len;
+
+        while (bytestream2_tell(&ctx->gb) < end) {
+            if (bytestream2_get_bytes_left(&ctx->gb) < 2)
+                return AVERROR_INVALIDDATA;
+
+            code = bytestream2_get_byteu(&ctx->gb);
+            flag = code & 1;
+            code = (code >> 1) + 1;
+            if (pos + code > width)
+                return AVERROR_INVALIDDATA;
+            if (flag) {
+                val = bytestream2_get_byteu(&ctx->gb);
+                if (val)
+                    memset(dst + pos, val, code);
+                pos += code;
+            } else {
+                if (bytestream2_get_bytes_left(&ctx->gb) < code)
+                    return AVERROR_INVALIDDATA;
+                for (j = 0; j < code; j++) {
+                    val = bytestream2_get_byteu(&ctx->gb);
+                    if (val)
+                        dst[pos] = val;
+                    pos++;
+                }
+            }
+        }
+        dst += ctx->pitch;
+    }
+    ctx->rotate_code = 0;
+
+    return 0;
+}
+
+static inline void codec37_mv(uint8_t *dst, const uint8_t *src,
+                              int height, int stride, int x, int y)
+{
+    int pos, i, j;
+
+    pos = x + y * stride;
+    for (j = 0; j < 4; j++) {
+        for (i = 0; i < 4; i++) {
+            if ((pos + i) < 0 || (pos + i) >= height * stride)
+                dst[i] = 0;
+            else
+                dst[i] = src[i];
+        }
+        dst += stride;
+        src += stride;
+        pos += stride;
+    }
+}
+
+static int old_codec37(SANMVideoContext *ctx, int top,
+                       int left, int width, int height)
+{
+    int stride = ctx->pitch;
+    int i, j, k, t;
+    uint8_t *dst, *prev;
+    int skip_run = 0;
+    int compr = bytestream2_get_byte(&ctx->gb);
+    int mvoff = bytestream2_get_byte(&ctx->gb);
+    int seq   = bytestream2_get_le16(&ctx->gb);
+    uint32_t decoded_size = bytestream2_get_le32(&ctx->gb);
+    int flags;
+
+    bytestream2_skip(&ctx->gb, 4);
+    flags = bytestream2_get_byte(&ctx->gb);
+    bytestream2_skip(&ctx->gb, 3);
+
+    if (decoded_size > ctx->height * stride - left - top * stride) {
+        decoded_size = ctx->height * stride - left - top * stride;
+        av_log(ctx->avctx, AV_LOG_WARNING, "Decoded size is too large.\n");
+    }
+
+    ctx->rotate_code = 0;
+
+    if (((seq & 1) || !(flags & 1)) && (compr && compr != 2))
+        rotate_bufs(ctx, 1);
+
+    dst  = ((uint8_t*)ctx->frm0) + left + top * stride;
+    prev = ((uint8_t*)ctx->frm2) + left + top * stride;
+
+    if (mvoff > 2) {
+        av_log(ctx->avctx, AV_LOG_ERROR, "Invalid motion base value %d.\n", mvoff);
+        return AVERROR_INVALIDDATA;
+    }
+
+    switch (compr) {
+    case 0:
+        for (i = 0; i < height; i++) {
+            bytestream2_get_buffer(&ctx->gb, dst, width);
+            dst += stride;
+        }
+        memset(ctx->frm1, 0, ctx->height * stride);
+        memset(ctx->frm2, 0, ctx->height * stride);
+        break;
+    case 2:
+        if (rle_decode(ctx, dst, decoded_size))
+            return AVERROR_INVALIDDATA;
+        memset(ctx->frm1, 0, ctx->frm1_size);
+        memset(ctx->frm2, 0, ctx->frm2_size);
+        break;
+    case 3:
+    case 4:
+        if (flags & 4) {
+            for (j = 0; j < height; j += 4) {
+                for (i = 0; i < width; i += 4) {
+                    int code;
+                    if (skip_run) {
+                        skip_run--;
+                        copy_block4(dst + i, prev + i, stride, stride, 4);
+                        continue;
+                    }
+                    if (bytestream2_get_bytes_left(&ctx->gb) < 1)
+                        return AVERROR_INVALIDDATA;
+                    code = bytestream2_get_byteu(&ctx->gb);
+                    switch (code) {
+                    case 0xFF:
+                        if (bytestream2_get_bytes_left(&ctx->gb) < 16)
+                            return AVERROR_INVALIDDATA;
+                        for (k = 0; k < 4; k++)
+                            bytestream2_get_bufferu(&ctx->gb, dst + i + k * stride, 4);
+                        break;
+                    case 0xFE:
+                        if (bytestream2_get_bytes_left(&ctx->gb) < 4)
+                            return AVERROR_INVALIDDATA;
+                        for (k = 0; k < 4; k++)
+                            memset(dst + i + k * stride, bytestream2_get_byteu(&ctx->gb), 4);
+                        break;
+                    case 0xFD:
+                        if (bytestream2_get_bytes_left(&ctx->gb) < 1)
+                            return AVERROR_INVALIDDATA;
+                        t = bytestream2_get_byteu(&ctx->gb);
+                        for (k = 0; k < 4; k++)
+                            memset(dst + i + k * stride, t, 4);
+                        break;
+                    default:
+                        if (compr == 4 && !code) {
+                            if (bytestream2_get_bytes_left(&ctx->gb) < 1)
+                                return AVERROR_INVALIDDATA;
+                            skip_run = bytestream2_get_byteu(&ctx->gb) + 1;
+                            i -= 4;
+                        } else {
+                            int mx, my;
+
+                            mx = c37_mv[(mvoff * 255 + code) * 2];
+                            my = c37_mv[(mvoff * 255 + code) * 2 + 1];
+                            codec37_mv(dst + i, prev + i + mx + my * stride,
+                                       ctx->height, stride, i + mx, j + my);
+                        }
+                    }
+                }
+                dst  += stride * 4;
+                prev += stride * 4;
+            }
+        } else {
+            for (j = 0; j < height; j += 4) {
+                for (i = 0; i < width; i += 4) {
+                    int code;
+                    if (skip_run) {
+                        skip_run--;
+                        copy_block4(dst + i, prev + i, stride, stride, 4);
+                        continue;
+                    }
+                    code = bytestream2_get_byte(&ctx->gb);
+                    if (code == 0xFF) {
+                        if (bytestream2_get_bytes_left(&ctx->gb) < 16)
+                            return AVERROR_INVALIDDATA;
+                        for (k = 0; k < 4; k++)
+                            bytestream2_get_bufferu(&ctx->gb, dst + i + k * stride, 4);
+                    } else if (compr == 4 && !code) {
+                        if (bytestream2_get_bytes_left(&ctx->gb) < 1)
+                            return AVERROR_INVALIDDATA;
+                        skip_run = bytestream2_get_byteu(&ctx->gb) + 1;
+                        i -= 4;
+                    } else {
+                        int mx, my;
+
+                        mx = c37_mv[(mvoff * 255 + code) * 2];
+                        my = c37_mv[(mvoff * 255 + code) * 2 + 1];
+                        codec37_mv(dst + i, prev + i + mx + my * stride,
+                                   ctx->height, stride, i + mx, j + my);
+                    }
+                }
+                dst  += stride * 4;
+                prev += stride * 4;
+            }
+        }
+        break;
+    default:
+        avpriv_report_missing_feature(ctx->avctx,
+                                      "Subcodec 37 compression %d", compr);
+        return AVERROR_PATCHWELCOME;
+    }
+
+    return 0;
+}
+
+static int process_block(SANMVideoContext *ctx, uint8_t *dst, uint8_t *prev1,
+                         uint8_t *prev2, int stride, int tbl, int size)
+{
+    int code, k, t;
+    uint8_t colors[2];
+    int8_t *pglyph;
+
+    if (bytestream2_get_bytes_left(&ctx->gb) < 1)
+        return AVERROR_INVALIDDATA;
+
+    code = bytestream2_get_byteu(&ctx->gb);
+    if (code >= 0xF8) {
+        switch (code) {
+        case 0xFF:
+            if (size == 2) {
+                if (bytestream2_get_bytes_left(&ctx->gb) < 4)
+                    return AVERROR_INVALIDDATA;
+                dst[0]          = bytestream2_get_byteu(&ctx->gb);
+                dst[1]          = bytestream2_get_byteu(&ctx->gb);
+                dst[0 + stride] = bytestream2_get_byteu(&ctx->gb);
+                dst[1 + stride] = bytestream2_get_byteu(&ctx->gb);
+            } else {
+                size >>= 1;
+                if (process_block(ctx, dst, prev1, prev2, stride, tbl, size))
+                    return AVERROR_INVALIDDATA;
+                if (process_block(ctx, dst + size, prev1 + size, prev2 + size,
+                                  stride, tbl, size))
+                    return AVERROR_INVALIDDATA;
+                dst   += size * stride;
+                prev1 += size * stride;
+                prev2 += size * stride;
+                if (process_block(ctx, dst, prev1, prev2, stride, tbl, size))
+                    return AVERROR_INVALIDDATA;
+                if (process_block(ctx, dst + size, prev1 + size, prev2 + size,
+                                  stride, tbl, size))
+                    return AVERROR_INVALIDDATA;
+            }
+            break;
+        case 0xFE:
+            if (bytestream2_get_bytes_left(&ctx->gb) < 1)
+                return AVERROR_INVALIDDATA;
+
+            t = bytestream2_get_byteu(&ctx->gb);
+            for (k = 0; k < size; k++)
+                memset(dst + k * stride, t, size);
+            break;
+        case 0xFD:
+            if (bytestream2_get_bytes_left(&ctx->gb) < 3)
+                return AVERROR_INVALIDDATA;
+
+            code = bytestream2_get_byteu(&ctx->gb);
+            pglyph = (size == 8) ? ctx->p8x8glyphs[code] : ctx->p4x4glyphs[code];
+            bytestream2_get_bufferu(&ctx->gb, colors, 2);
+
+            for (k = 0; k < size; k++)
+                for (t = 0; t < size; t++)
+                    dst[t + k * stride] = colors[!*pglyph++];
+            break;
+        case 0xFC:
+            for (k = 0; k < size; k++)
+                memcpy(dst + k * stride, prev1 + k * stride, size);
+            break;
+        default:
+            k = bytestream2_tell(&ctx->gb);
+            bytestream2_seek(&ctx->gb, tbl + (code & 7), SEEK_SET);
+            t = bytestream2_get_byte(&ctx->gb);
+            bytestream2_seek(&ctx->gb, k, SEEK_SET);
+            for (k = 0; k < size; k++)
+                memset(dst + k * stride, t, size);
+        }
+    } else {
+        int mx = motion_vectors[code][0];
+        int my = motion_vectors[code][1];
+        int index = prev2 - (const uint8_t *)ctx->frm2;
+
+        av_assert2(index >= 0 && index < (ctx->buf_size >> 1));
+
+        if (index < -mx - my * stride ||
+            (ctx->buf_size >> 1) - index < mx + size + (my + size - 1) * stride) {
+            av_log(ctx->avctx, AV_LOG_ERROR, "MV is invalid.\n");
+            return AVERROR_INVALIDDATA;
+        }
+
+        for (k = 0; k < size; k++)
+            memcpy(dst + k * stride, prev2 + mx + (my + k) * stride, size);
+    }
+
+    return 0;
+}
+
+static int old_codec47(SANMVideoContext *ctx, int top,
+                       int left, int width, int height)
+{
+    uint32_t decoded_size;
+    int i, j;
+    int stride     = ctx->pitch;
+    uint8_t *dst   = (uint8_t *)ctx->frm0 + left + top * stride;
+    uint8_t *prev1 = (uint8_t *)ctx->frm1;
+    uint8_t *prev2 = (uint8_t *)ctx->frm2;
+    int tbl_pos = bytestream2_tell(&ctx->gb);
+    int seq     = bytestream2_get_le16(&ctx->gb);
+    int compr   = bytestream2_get_byte(&ctx->gb);
+    int new_rot = bytestream2_get_byte(&ctx->gb);
+    int skip    = bytestream2_get_byte(&ctx->gb);
+
+    bytestream2_skip(&ctx->gb, 9);
+    decoded_size = bytestream2_get_le32(&ctx->gb);
+    bytestream2_skip(&ctx->gb, 8);
+
+    if (decoded_size > ctx->height * stride - left - top * stride) {
+        decoded_size = ctx->height * stride - left - top * stride;
+        av_log(ctx->avctx, AV_LOG_WARNING, "Decoded size is too large.\n");
+    }
+
+    if (skip & 1)
+        bytestream2_skip(&ctx->gb, 0x8080);
+    if (!seq) {
+        ctx->prev_seq = -1;
+        memset(prev1, 0, ctx->height * stride);
+        memset(prev2, 0, ctx->height * stride);
+    }
+
+    switch (compr) {
+    case 0:
+        if (bytestream2_get_bytes_left(&ctx->gb) < width * height)
+            return AVERROR_INVALIDDATA;
+        for (j = 0; j < height; j++) {
+            bytestream2_get_bufferu(&ctx->gb, dst, width);
+            dst += stride;
+        }
+        break;
+    case 1:
+        if (bytestream2_get_bytes_left(&ctx->gb) < ((width + 1) >> 1) * ((height + 1) >> 1))
+            return AVERROR_INVALIDDATA;
+        for (j = 0; j < height; j += 2) {
+            for (i = 0; i < width; i += 2) {
+                dst[i] =
+                dst[i + 1] =
+                dst[stride + i] =
+                dst[stride + i + 1] = bytestream2_get_byteu(&ctx->gb);
+            }
+            dst += stride * 2;
+        }
+        break;
+    case 2:
+        if (seq == ctx->prev_seq + 1) {
+            for (j = 0; j < height; j += 8) {
+                for (i = 0; i < width; i += 8)
+                    if (process_block(ctx, dst + i, prev1 + i, prev2 + i, stride,
+                                      tbl_pos + 8, 8))
+                        return AVERROR_INVALIDDATA;
+                dst   += stride * 8;
+                prev1 += stride * 8;
+                prev2 += stride * 8;
+            }
+        }
+        break;
+    case 3:
+        memcpy(ctx->frm0, ctx->frm2, ctx->pitch * ctx->height);
+        break;
+    case 4:
+        memcpy(ctx->frm0, ctx->frm1, ctx->pitch * ctx->height);
+        break;
+    case 5:
+        if (rle_decode(ctx, dst, decoded_size))
+            return AVERROR_INVALIDDATA;
+        break;
+    default:
+        avpriv_report_missing_feature(ctx->avctx,
+                                      "Subcodec 47 compression %d", compr);
+        return AVERROR_PATCHWELCOME;
+    }
+    if (seq == ctx->prev_seq + 1)
+        ctx->rotate_code = new_rot;
+    else
+        ctx->rotate_code = 0;
+    ctx->prev_seq = seq;
+
+    return 0;
+}
+
+static int process_frame_obj(SANMVideoContext *ctx)
+{
+    uint16_t codec = bytestream2_get_le16u(&ctx->gb);
+    uint16_t left  = bytestream2_get_le16u(&ctx->gb);
+    uint16_t top   = bytestream2_get_le16u(&ctx->gb);
+    uint16_t w     = bytestream2_get_le16u(&ctx->gb);
+    uint16_t h     = bytestream2_get_le16u(&ctx->gb);
+
+    if (!w || !h) {
+        av_log(ctx->avctx, AV_LOG_ERROR, "Dimensions are invalid.\n");
+        return AVERROR_INVALIDDATA;
+    }
+
+    if (ctx->width < left + w || ctx->height < top + h) {
+        int ret = ff_set_dimensions(ctx->avctx, FFMAX(left + w, ctx->width),
+                                    FFMAX(top + h, ctx->height));
+        if (ret < 0)
+            return ret;
+        init_sizes(ctx, FFMAX(left + w, ctx->width),
+                   FFMAX(top + h, ctx->height));
+        if (init_buffers(ctx)) {
+            av_log(ctx->avctx, AV_LOG_ERROR, "Error resizing buffers.\n");
+            return AVERROR(ENOMEM);
+        }
+    }
+    bytestream2_skip(&ctx->gb, 4);
+
+    switch (codec) {
+    case 1:
+    case 3:
+        return old_codec1(ctx, top, left, w, h);
+        break;
+    case 37:
+        return old_codec37(ctx, top, left, w, h);
+        break;
+    case 47:
+        return old_codec47(ctx, top, left, w, h);
+        break;
+    default:
+        avpriv_request_sample(ctx->avctx, "Subcodec %d", codec);
+        return AVERROR_PATCHWELCOME;
+    }
+}
+
+static int decode_0(SANMVideoContext *ctx)
+{
+    uint16_t *frm = ctx->frm0;
+    int x, y;
+
+    if (bytestream2_get_bytes_left(&ctx->gb) < ctx->width * ctx->height * 2) {
+        av_log(ctx->avctx, AV_LOG_ERROR, "Insufficient data for raw frame.\n");
+        return AVERROR_INVALIDDATA;
+    }
+    for (y = 0; y < ctx->height; y++) {
+        for (x = 0; x < ctx->width; x++)
+            frm[x] = bytestream2_get_le16u(&ctx->gb);
+        frm += ctx->pitch;
+    }
+    return 0;
+}
+
+static int decode_nop(SANMVideoContext *ctx)
+{
+    avpriv_request_sample(ctx->avctx, "Unknown/unsupported compression type");
+    return AVERROR_PATCHWELCOME;
+}
+
+static void copy_block(uint16_t *pdest, uint16_t *psrc, int block_size, int pitch)
+{
+    uint8_t *dst = (uint8_t *)pdest;
+    uint8_t *src = (uint8_t *)psrc;
+    int stride = pitch * 2;
+
+    switch (block_size) {
+    case 2:
+        copy_block4(dst, src, stride, stride, 2);
+        break;
+    case 4:
+        copy_block8(dst, src, stride, stride, 4);
+        break;
+    case 8:
+        copy_block16(dst, src, stride, stride, 8);
+        break;
+    }
+}
+
+static void fill_block(uint16_t *pdest, uint16_t color, int block_size, int pitch)
+{
+    int x, y;
+
+    pitch -= block_size;
+    for (y = 0; y < block_size; y++, pdest += pitch)
+        for (x = 0; x < block_size; x++)
+            *pdest++ = color;
+}
+
+static int draw_glyph(SANMVideoContext *ctx, uint16_t *dst, int index,
+                      uint16_t fg_color, uint16_t bg_color, int block_size,
+                      int pitch)
+{
+    int8_t *pglyph;
+    uint16_t colors[2] = { fg_color, bg_color };
+    int x, y;
+
+    if (index >= NGLYPHS) {
+        av_log(ctx->avctx, AV_LOG_ERROR, "Ignoring nonexistent glyph #%u.\n", index);
+        return AVERROR_INVALIDDATA;
+    }
+
+    pglyph = block_size == 8 ? ctx->p8x8glyphs[index] : ctx->p4x4glyphs[index];
+    pitch -= block_size;
+
+    for (y = 0; y < block_size; y++, dst += pitch)
+        for (x = 0; x < block_size; x++)
+            *dst++ = colors[*pglyph++];
+    return 0;
+}
+
+static int opcode_0xf7(SANMVideoContext *ctx, int cx, int cy, int block_size, int pitch)
+{
+    uint16_t *dst = ctx->frm0 + cx + cy * ctx->pitch;
+
+    if (block_size == 2) {
+        uint32_t indices;
+
+        if (bytestream2_get_bytes_left(&ctx->gb) < 4)
+            return AVERROR_INVALIDDATA;
+
+        indices        = bytestream2_get_le32u(&ctx->gb);
+        dst[0]         = ctx->codebook[indices & 0xFF];
+        indices      >>= 8;
+        dst[1]         = ctx->codebook[indices & 0xFF];
+        indices      >>= 8;
+        dst[pitch]     = ctx->codebook[indices & 0xFF];
+        indices      >>= 8;
+        dst[pitch + 1] = ctx->codebook[indices & 0xFF];
+    } else {
+        uint16_t fgcolor, bgcolor;
+        int glyph;
+
+        if (bytestream2_get_bytes_left(&ctx->gb) < 3)
+            return AVERROR_INVALIDDATA;
+
+        glyph   = bytestream2_get_byteu(&ctx->gb);
+        bgcolor = ctx->codebook[bytestream2_get_byteu(&ctx->gb)];
+        fgcolor = ctx->codebook[bytestream2_get_byteu(&ctx->gb)];
+
+        draw_glyph(ctx, dst, glyph, fgcolor, bgcolor, block_size, pitch);
+    }
+    return 0;
+}
+
+static int opcode_0xf8(SANMVideoContext *ctx, int cx, int cy, int block_size, int pitch)
+{
+    uint16_t *dst = ctx->frm0 + cx + cy * ctx->pitch;
+
+    if (block_size == 2) {
+        if (bytestream2_get_bytes_left(&ctx->gb) < 8)
+            return AVERROR_INVALIDDATA;
+
+        dst[0]         = bytestream2_get_le16u(&ctx->gb);
+        dst[1]         = bytestream2_get_le16u(&ctx->gb);
+        dst[pitch]     = bytestream2_get_le16u(&ctx->gb);
+        dst[pitch + 1] = bytestream2_get_le16u(&ctx->gb);
+    } else {
+        uint16_t fgcolor, bgcolor;
+        int glyph;
+
+        if (bytestream2_get_bytes_left(&ctx->gb) < 5)
+            return AVERROR_INVALIDDATA;
+
+        glyph   = bytestream2_get_byteu(&ctx->gb);
+        bgcolor = bytestream2_get_le16u(&ctx->gb);
+        fgcolor = bytestream2_get_le16u(&ctx->gb);
+
+        draw_glyph(ctx, dst, glyph, fgcolor, bgcolor, block_size, pitch);
+    }
+    return 0;
+}
+
+static int good_mvec(SANMVideoContext *ctx, int cx, int cy, int mx, int my,
+                     int block_size)
+{
+    int start_pos = cx + mx + (cy + my) * ctx->pitch;
+    int end_pos = start_pos + (block_size - 1) * (ctx->pitch + 1);
+
+    int good = start_pos >= 0 && end_pos < (ctx->buf_size >> 1);
+
+    if (!good)
+        av_log(ctx->avctx, AV_LOG_ERROR,
+               "Ignoring invalid motion vector (%i, %i)->(%u, %u), block size = %u\n",
+               cx + mx, cy + my, cx, cy, block_size);
+
+    return good;
+}
+
+static int codec2subblock(SANMVideoContext *ctx, int cx, int cy, int blk_size)
+{
+    int16_t mx, my, index;
+    int opcode;
+
+    if (bytestream2_get_bytes_left(&ctx->gb) < 1)
+        return AVERROR_INVALIDDATA;
+
+    opcode = bytestream2_get_byteu(&ctx->gb);
+
+    switch (opcode) {
+    default:
+        mx = motion_vectors[opcode][0];
+        my = motion_vectors[opcode][1];
+
+        if (good_mvec(ctx, cx, cy, mx, my, blk_size)) {
+            copy_block(ctx->frm0 + cx      + ctx->pitch *  cy,
+                       ctx->frm2 + cx + mx + ctx->pitch * (cy + my),
+                       blk_size, ctx->pitch);
+        }
+        break;
+    case 0xF5:
+        if (bytestream2_get_bytes_left(&ctx->gb) < 2)
+            return AVERROR_INVALIDDATA;
+        index = bytestream2_get_le16u(&ctx->gb);
+
+        mx = index % ctx->width;
+        my = index / ctx->width;
+
+        if (good_mvec(ctx, cx, cy, mx, my, blk_size)) {
+            copy_block(ctx->frm0 + cx      + ctx->pitch *  cy,
+                       ctx->frm2 + cx + mx + ctx->pitch * (cy + my),
+                       blk_size, ctx->pitch);
+        }
+        break;
+    case 0xF6:
+        copy_block(ctx->frm0 + cx + ctx->pitch * cy,
+                   ctx->frm1 + cx + ctx->pitch * cy,
+                   blk_size, ctx->pitch);
+        break;
+    case 0xF7:
+        opcode_0xf7(ctx, cx, cy, blk_size, ctx->pitch);
+        break;
+
+    case 0xF8:
+        opcode_0xf8(ctx, cx, cy, blk_size, ctx->pitch);
+        break;
+    case 0xF9:
+    case 0xFA:
+    case 0xFB:
+    case 0xFC:
+        fill_block(ctx->frm0 + cx + cy * ctx->pitch,
+                   ctx->small_codebook[opcode - 0xf9], blk_size, ctx->pitch);
+        break;
+    case 0xFD:
+        if (bytestream2_get_bytes_left(&ctx->gb) < 1)
+            return AVERROR_INVALIDDATA;
+        fill_block(ctx->frm0 + cx + cy * ctx->pitch,
+                   ctx->codebook[bytestream2_get_byteu(&ctx->gb)], blk_size, ctx->pitch);
+        break;
+    case 0xFE:
+        if (bytestream2_get_bytes_left(&ctx->gb) < 2)
+            return AVERROR_INVALIDDATA;
+        fill_block(ctx->frm0 + cx + cy * ctx->pitch,
+                   bytestream2_get_le16u(&ctx->gb), blk_size, ctx->pitch);
+        break;
+    case 0xFF:
+        if (blk_size == 2) {
+            opcode_0xf8(ctx, cx, cy, blk_size, ctx->pitch);
+        } else {
+            blk_size >>= 1;
+            if (codec2subblock(ctx, cx, cy, blk_size))
+                return AVERROR_INVALIDDATA;
+            if (codec2subblock(ctx, cx + blk_size, cy, blk_size))
+                return AVERROR_INVALIDDATA;
+            if (codec2subblock(ctx, cx, cy + blk_size, blk_size))
+                return AVERROR_INVALIDDATA;
+            if (codec2subblock(ctx, cx + blk_size, cy + blk_size, blk_size))
+                return AVERROR_INVALIDDATA;
+        }
+        break;
+    }
+    return 0;
+}
+
+static int decode_2(SANMVideoContext *ctx)
+{
+    int cx, cy, ret;
+
+    for (cy = 0; cy < ctx->aligned_height; cy += 8)
+        for (cx = 0; cx < ctx->aligned_width; cx += 8)
+            if (ret = codec2subblock(ctx, cx, cy, 8))
+                return ret;
+
+    return 0;
+}
+
+static int decode_3(SANMVideoContext *ctx)
+{
+    memcpy(ctx->frm0, ctx->frm2, ctx->frm2_size);
+    return 0;
+}
+
+static int decode_4(SANMVideoContext *ctx)
+{
+    memcpy(ctx->frm0, ctx->frm1, ctx->frm1_size);
+    return 0;
+}
+
+static int decode_5(SANMVideoContext *ctx)
+{
+#if HAVE_BIGENDIAN
+    uint16_t *frm;
+    int npixels;
+#endif
+    uint8_t *dst = (uint8_t*)ctx->frm0;
+
+    if (rle_decode(ctx, dst, ctx->buf_size))
+        return AVERROR_INVALIDDATA;
+
+#if HAVE_BIGENDIAN
+    npixels = ctx->npixels;
+    frm = ctx->frm0;
+    while (npixels--) {
+        *frm = av_bswap16(*frm);
+        frm++;
+    }
+#endif
+
+    return 0;
+}
+
+static int decode_6(SANMVideoContext *ctx)
+{
+    int npixels = ctx->npixels;
+    uint16_t *frm = ctx->frm0;
+
+    if (bytestream2_get_bytes_left(&ctx->gb) < npixels) {
+        av_log(ctx->avctx, AV_LOG_ERROR, "Insufficient data for frame.\n");
+        return AVERROR_INVALIDDATA;
+    }
+    while (npixels--)
+        *frm++ = ctx->codebook[bytestream2_get_byteu(&ctx->gb)];
+
+    return 0;
+}
+
+static int decode_8(SANMVideoContext *ctx)
+{
+    uint16_t *pdest = ctx->frm0;
+    uint8_t *rsrc;
+    long npixels = ctx->npixels;
+
+    av_fast_malloc(&ctx->rle_buf, &ctx->rle_buf_size, npixels);
+    if (!ctx->rle_buf) {
+        av_log(ctx->avctx, AV_LOG_ERROR, "RLE buffer allocation failed.\n");
+        return AVERROR(ENOMEM);
+    }
+    rsrc = ctx->rle_buf;
+
+    if (rle_decode(ctx, rsrc, npixels))
+        return AVERROR_INVALIDDATA;
+
+    while (npixels--)
+        *pdest++ = ctx->codebook[*rsrc++];
+
+    return 0;
+}
+
+typedef int (*frm_decoder)(SANMVideoContext *ctx);
+
+static const frm_decoder v1_decoders[] = {
+    decode_0, decode_nop, decode_2, decode_3, decode_4, decode_5,
+    decode_6, decode_nop, decode_8
+};
+
+static int read_frame_header(SANMVideoContext *ctx, SANMFrameHeader *hdr)
+{
+    int i, ret;
+
+    if ((ret = bytestream2_get_bytes_left(&ctx->gb)) < 560) {
+        av_log(ctx->avctx, AV_LOG_ERROR, "Input frame too short (%d bytes).\n",
+               ret);
+        return AVERROR_INVALIDDATA;
+    }
+    bytestream2_skip(&ctx->gb, 8); // skip pad
+
+    hdr->width  = bytestream2_get_le32u(&ctx->gb);
+    hdr->height = bytestream2_get_le32u(&ctx->gb);
+
+    if (hdr->width != ctx->width || hdr->height != ctx->height) {
+        avpriv_report_missing_feature(ctx->avctx, "Variable size frames");
+        return AVERROR_PATCHWELCOME;
+    }
+
+    hdr->seq_num     = bytestream2_get_le16u(&ctx->gb);
+    hdr->codec       = bytestream2_get_byteu(&ctx->gb);
+    hdr->rotate_code = bytestream2_get_byteu(&ctx->gb);
+
+    bytestream2_skip(&ctx->gb, 4); // skip pad
+
+    for (i = 0; i < 4; i++)
+        ctx->small_codebook[i] = bytestream2_get_le16u(&ctx->gb);
+    hdr->bg_color = bytestream2_get_le16u(&ctx->gb);
+
+    bytestream2_skip(&ctx->gb, 2); // skip pad
+
+    hdr->rle_output_size = bytestream2_get_le32u(&ctx->gb);
+    for (i = 0; i < 256; i++)
+        ctx->codebook[i] = bytestream2_get_le16u(&ctx->gb);
+
+    bytestream2_skip(&ctx->gb, 8); // skip pad
+
+    return 0;
+}
+
+static void fill_frame(uint16_t *pbuf, int buf_size, uint16_t color)
+{
+    while (buf_size--)
+        *pbuf++ = color;
+}
+
+static int copy_output(SANMVideoContext *ctx, SANMFrameHeader *hdr)
+{
+    uint8_t *dst;
+    const uint8_t *src = (uint8_t*) ctx->frm0;
+    int ret, dstpitch, height = ctx->height;
+    int srcpitch = ctx->pitch * (hdr ? sizeof(ctx->frm0[0]) : 1);
+
+    if ((ret = ff_get_buffer(ctx->avctx, ctx->frame, 0)) < 0)
+        return ret;
+
+    dst      = ctx->frame->data[0];
+    dstpitch = ctx->frame->linesize[0];
+
+    while (height--) {
+        memcpy(dst, src, srcpitch);
+        src += srcpitch;
+        dst += dstpitch;
+    }
+
+    return 0;
+}
+
+static int decode_frame(AVCodecContext *avctx, void *data,
+                        int *got_frame_ptr, AVPacket *pkt)
+{
+    SANMVideoContext *ctx = avctx->priv_data;
+    int i, ret;
+
+    ctx->frame = data;
+    bytestream2_init(&ctx->gb, pkt->data, pkt->size);
+
+    if (!ctx->version) {
+        int to_store = 0;
+
+        while (bytestream2_get_bytes_left(&ctx->gb) >= 8) {
+            uint32_t sig, size;
+            int pos;
+
+            sig  = bytestream2_get_be32u(&ctx->gb);
+            size = bytestream2_get_be32u(&ctx->gb);
+            pos  = bytestream2_tell(&ctx->gb);
+
+            if (bytestream2_get_bytes_left(&ctx->gb) < size) {
+                av_log(avctx, AV_LOG_ERROR, "Incorrect chunk size %d.\n", size);
+                break;
+            }
+            switch (sig) {
+            case MKBETAG('N', 'P', 'A', 'L'):
+                if (size != PALETTE_SIZE * 3) {
+                    av_log(avctx, AV_LOG_ERROR,
+                           "Incorrect palette block size %d.\n", size);
+                    return AVERROR_INVALIDDATA;
+                }
+                for (i = 0; i < PALETTE_SIZE; i++)
+                    ctx->pal[i] = 0xFFU << 24 | bytestream2_get_be24u(&ctx->gb);
+                break;
+            case MKBETAG('F', 'O', 'B', 'J'):
+                if (size < 16)
+                    return AVERROR_INVALIDDATA;
+                if (ret = process_frame_obj(ctx))
+                    return ret;
+                break;
+            case MKBETAG('X', 'P', 'A', 'L'):
+                if (size == 6 || size == 4) {
+                    uint8_t tmp[3];
+                    int j;
+
+                    for (i = 0; i < PALETTE_SIZE; i++) {
+                        for (j = 0; j < 3; j++) {
+                            int t = (ctx->pal[i] >> (16 - j * 8)) & 0xFF;
+                            tmp[j] = av_clip_uint8((t * 129 + ctx->delta_pal[i * 3 + j]) >> 7);
+                        }
+                        ctx->pal[i] = 0xFFU << 24 | AV_RB24(tmp);
+                    }
+                } else {
+                    if (size < PALETTE_DELTA * 2 + 4) {
+                        av_log(avctx, AV_LOG_ERROR, "Incorrect palette change block size %d.\n",
+                               size);
+                        return AVERROR_INVALIDDATA;
+                    }
+                    bytestream2_skipu(&ctx->gb, 4);
+                    for (i = 0; i < PALETTE_DELTA; i++)
+                        ctx->delta_pal[i] = bytestream2_get_le16u(&ctx->gb);
+                    if (size >= PALETTE_DELTA * 5 + 4) {
+                        for (i = 0; i < PALETTE_SIZE; i++)
+                            ctx->pal[i] = 0xFFU << 24 | bytestream2_get_be24u(&ctx->gb);
+                    } else {
+                        memset(ctx->pal, 0, sizeof(ctx->pal));
+                    }
+                }
+                break;
+            case MKBETAG('S', 'T', 'O', 'R'):
+                to_store = 1;
+                break;
+            case MKBETAG('F', 'T', 'C', 'H'):
+                memcpy(ctx->frm0, ctx->stored_frame, ctx->buf_size);
+                break;
+            default:
+                bytestream2_skip(&ctx->gb, size);
+                av_log(avctx, AV_LOG_DEBUG, "Unknown/unsupported chunk %x.\n", sig);
+                break;
+            }
+
+            bytestream2_seek(&ctx->gb, pos + size, SEEK_SET);
+            if (size & 1)
+                bytestream2_skip(&ctx->gb, 1);
+        }
+        if (to_store)
+            memcpy(ctx->stored_frame, ctx->frm0, ctx->buf_size);
+        if ((ret = copy_output(ctx, NULL)))
+            return ret;
+        memcpy(ctx->frame->data[1], ctx->pal, 1024);
+    } else {
+        SANMFrameHeader header;
+
+        if ((ret = read_frame_header(ctx, &header)))
+            return ret;
+
+        ctx->rotate_code = header.rotate_code;
+        if ((ctx->frame->key_frame = !header.seq_num)) {
+            ctx->frame->pict_type = AV_PICTURE_TYPE_I;
+            fill_frame(ctx->frm1, ctx->npixels, header.bg_color);
+            fill_frame(ctx->frm2, ctx->npixels, header.bg_color);
+        } else {
+            ctx->frame->pict_type = AV_PICTURE_TYPE_P;
+        }
+
+        if (header.codec < FF_ARRAY_ELEMS(v1_decoders)) {
+            if ((ret = v1_decoders[header.codec](ctx))) {
+                av_log(avctx, AV_LOG_ERROR,
+                       "Subcodec %d: error decoding frame.\n", header.codec);
+                return ret;
+            }
+        } else {
+            avpriv_request_sample(avctx, "Subcodec %d", header.codec);
+            return AVERROR_PATCHWELCOME;
+        }
+
+        if ((ret = copy_output(ctx, &header)))
+            return ret;
+    }
+    if (ctx->rotate_code)
+        rotate_bufs(ctx, ctx->rotate_code);
+
+    *got_frame_ptr = 1;
+
+    return pkt->size;
+}
+
+AVCodec ff_sanm_decoder = {
+    .name           = "sanm",
+    .long_name      = NULL_IF_CONFIG_SMALL("LucasArts SANM video"),
+    .type           = AVMEDIA_TYPE_VIDEO,
+    .id             = AV_CODEC_ID_SANM,
+    .priv_data_size = sizeof(SANMVideoContext),
+    .init           = decode_init,
+    .close          = decode_end,
+    .decode         = decode_frame,
+    .capabilities   = CODEC_CAP_DR1,
+};