indeo2: Fix banding artefacts

Rename luma table to delta table and change how it is used.

CC: libav-stable@libav.org
Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>
Signed-off-by: Diego Biurrun <diego@biurrun.de>
(cherry picked from commit f8c34f4b8d62afad3f63cf3d9617d73735bef8c1)

2 files changed, 138 insertions, 39 deletions

diff --git a/libavcodec/indeo2.c b/libavcodec/indeo2.c
index 3424e00b38..17f236761d 100644
--- a/libavcodec/indeo2.c
+++ b/libavcodec/indeo2.c
@@ -146,6 +146,7 @@ static int ir2_decode_frame(AVCodecContext *avctx,
     AVFrame *picture     = data;
     AVFrame * const p    = s->picture;
     int start, ret;
+    int ltab, ctab;
 
     if ((ret = ff_reget_buffer(avctx, p)) < 0)
         return ret;
@@ -168,34 +169,36 @@ static int ir2_decode_frame(AVCodecContext *avctx,
     if ((ret = init_get_bits8(&s->gb, buf + start, buf_size - start)) < 0)
         return ret;
 
+    ltab = buf[0x22] & 3;
+    ctab = buf[0x22] >> 2;
     if (s->decode_delta) { /* intraframe */
         if ((ret = ir2_decode_plane(s, avctx->width, avctx->height,
                                     p->data[0], p->linesize[0],
-                                    ir2_luma_table)) < 0)
+                                    ir2_delta_table[ltab])) < 0)
             return ret;
 
         /* swapped U and V */
         if ((ret = ir2_decode_plane(s, avctx->width >> 2, avctx->height >> 2,
                                     p->data[2], p->linesize[2],
-                                    ir2_luma_table)) < 0)
+                                    ir2_delta_table[ctab])) < 0)
             return ret;
         if ((ret = ir2_decode_plane(s, avctx->width >> 2, avctx->height >> 2,
                                     p->data[1], p->linesize[1],
-                                    ir2_luma_table)) < 0)
+                                    ir2_delta_table[ctab])) < 0)
             return ret;
     } else { /* interframe */
         if ((ret = ir2_decode_plane_inter(s, avctx->width, avctx->height,
                                           p->data[0], p->linesize[0],
-                                          ir2_luma_table)) < 0)
+                                          ir2_delta_table[ltab])) < 0)
             return ret;
         /* swapped U and V */
         if ((ret = ir2_decode_plane_inter(s, avctx->width >> 2, avctx->height >> 2,
                                           p->data[2], p->linesize[2],
-                                          ir2_luma_table)) < 0)
+                                          ir2_delta_table[ctab])) < 0)
             return ret;
         if ((ret = ir2_decode_plane_inter(s, avctx->width >> 2, avctx->height >> 2,
                                           p->data[1], p->linesize[1],
-                                          ir2_luma_table)) < 0)
+                                          ir2_delta_table[ctab])) < 0)
             return ret;
     }
 
diff --git a/libavcodec/indeo2data.h b/libavcodec/indeo2data.h
index 8fd664c6ab..e05c91ff58 100644
--- a/libavcodec/indeo2data.h
+++ b/libavcodec/indeo2data.h
@@ -103,39 +103,135 @@ static const uint16_t ir2_codes[IR2_CODES][2] = {
 #endif
 };
 
-static const uint8_t ir2_luma_table[256] = {
-    0x80, 0x80, 0x84, 0x84, 0x7C, 0x7C, 0x7F, 0x85,
-    0x81, 0x7B, 0x85, 0x7F, 0x7B, 0x81, 0x8C, 0x8C,
-    0x74, 0x74, 0x83, 0x8D, 0x7D, 0x73, 0x8D, 0x83,
-    0x73, 0x7D, 0x77, 0x89, 0x89, 0x77, 0x89, 0x77,
-    0x77, 0x89, 0x8C, 0x95, 0x74, 0x6B, 0x95, 0x8C,
-    0x6B, 0x74, 0x7C, 0x90, 0x84, 0x70, 0x90, 0x7C,
-    0x70, 0x84, 0x96, 0x96, 0x6A, 0x6A, 0x82, 0x98,
-    0x7E, 0x68, 0x98, 0x82, 0x68, 0x7E, 0x97, 0xA2,
-    0x69, 0x5E, 0xA2, 0x97, 0x5E, 0x69, 0xA2, 0xA2,
-    0x5E, 0x5E, 0x8B, 0xA3, 0x75, 0x5D, 0xA3, 0x8B,
-    0x5D, 0x75, 0x71, 0x95, 0x8F, 0x6B, 0x95, 0x71,
-    0x6B, 0x8F, 0x78, 0x9D, 0x88, 0x63, 0x9D, 0x78,
-    0x63, 0x88, 0x7F, 0xA7, 0x81, 0x59, 0xA7, 0x7F,
-    0x59, 0x81, 0xA4, 0xB1, 0x5C, 0x4F, 0xB1, 0xA4,
-    0x4F, 0x5C, 0x96, 0xB1, 0x6A, 0x4F, 0xB1, 0x96,
-    0x4F, 0x6A, 0xB2, 0xB2, 0x4E, 0x4E, 0x65, 0x9B,
-    0x9B, 0x65, 0x9B, 0x65, 0x65, 0x9B, 0x89, 0xB4,
-    0x77, 0x4C, 0xB4, 0x89, 0x4C, 0x77, 0x6A, 0xA3,
-    0x96, 0x5D, 0xA3, 0x6A, 0x5D, 0x96, 0x73, 0xAC,
-    0x8D, 0x54, 0xAC, 0x73, 0x54, 0x8D, 0xB4, 0xC3,
-    0x4C, 0x3D, 0xC3, 0xB4, 0x3D, 0x4C, 0xA4, 0xC3,
-    0x5C, 0x3D, 0xC3, 0xA4, 0x3D, 0x5C, 0xC4, 0xC4,
-    0x3C, 0x3C, 0x96, 0xC6, 0x6A, 0x3A, 0xC6, 0x96,
-    0x3A, 0x6A, 0x7C, 0xBA, 0x84, 0x46, 0xBA, 0x7C,
-    0x46, 0x84, 0x5B, 0xAB, 0xA5, 0x55, 0xAB, 0x5B,
-    0x55, 0xA5, 0x63, 0xB4, 0x9D, 0x4C, 0xB4, 0x63,
-    0x4C, 0x9D, 0x86, 0xCA, 0x7A, 0x36, 0xCA, 0x86,
-    0x36, 0x7A, 0xB6, 0xD7, 0x4A, 0x29, 0xD7, 0xB6,
-    0x29, 0x4A, 0xC8, 0xD7, 0x38, 0x29, 0xD7, 0xC8,
-    0x29, 0x38, 0xA4, 0xD8, 0x5C, 0x28, 0xD8, 0xA4,
-    0x28, 0x5C, 0x6C, 0xC1, 0x94, 0x3F, 0xC1, 0x6C,
-    0x3F, 0x94, 0xD9, 0xD9, 0x27, 0x27, 0x80, 0x80,
+static const uint8_t ir2_delta_table[4][256] = {
+    { 0x80, 0x80, 0x84, 0x84, 0x7C, 0x7C, 0x7F, 0x85,
+      0x81, 0x7B, 0x85, 0x7F, 0x7B, 0x81, 0x8C, 0x8C,
+      0x74, 0x74, 0x83, 0x8D, 0x7D, 0x73, 0x8D, 0x83,
+      0x73, 0x7D, 0x77, 0x89, 0x89, 0x77, 0x89, 0x77,
+      0x77, 0x89, 0x8C, 0x95, 0x74, 0x6B, 0x95, 0x8C,
+      0x6B, 0x74, 0x7C, 0x90, 0x84, 0x70, 0x90, 0x7C,
+      0x70, 0x84, 0x96, 0x96, 0x6A, 0x6A, 0x82, 0x98,
+      0x7E, 0x68, 0x98, 0x82, 0x68, 0x7E, 0x97, 0xA2,
+      0x69, 0x5E, 0xA2, 0x97, 0x5E, 0x69, 0xA2, 0xA2,
+      0x5E, 0x5E, 0x8B, 0xA3, 0x75, 0x5D, 0xA3, 0x8B,
+      0x5D, 0x75, 0x71, 0x95, 0x8F, 0x6B, 0x95, 0x71,
+      0x6B, 0x8F, 0x78, 0x9D, 0x88, 0x63, 0x9D, 0x78,
+      0x63, 0x88, 0x7F, 0xA7, 0x81, 0x59, 0xA7, 0x7F,
+      0x59, 0x81, 0xA4, 0xB1, 0x5C, 0x4F, 0xB1, 0xA4,
+      0x4F, 0x5C, 0x96, 0xB1, 0x6A, 0x4F, 0xB1, 0x96,
+      0x4F, 0x6A, 0xB2, 0xB2, 0x4E, 0x4E, 0x65, 0x9B,
+      0x9B, 0x65, 0x9B, 0x65, 0x65, 0x9B, 0x89, 0xB4,
+      0x77, 0x4C, 0xB4, 0x89, 0x4C, 0x77, 0x6A, 0xA3,
+      0x96, 0x5D, 0xA3, 0x6A, 0x5D, 0x96, 0x73, 0xAC,
+      0x8D, 0x54, 0xAC, 0x73, 0x54, 0x8D, 0xB4, 0xC3,
+      0x4C, 0x3D, 0xC3, 0xB4, 0x3D, 0x4C, 0xA4, 0xC3,
+      0x5C, 0x3D, 0xC3, 0xA4, 0x3D, 0x5C, 0xC4, 0xC4,
+      0x3C, 0x3C, 0x96, 0xC6, 0x6A, 0x3A, 0xC6, 0x96,
+      0x3A, 0x6A, 0x7C, 0xBA, 0x84, 0x46, 0xBA, 0x7C,
+      0x46, 0x84, 0x5B, 0xAB, 0xA5, 0x55, 0xAB, 0x5B,
+      0x55, 0xA5, 0x63, 0xB4, 0x9D, 0x4C, 0xB4, 0x63,
+      0x4C, 0x9D, 0x86, 0xCA, 0x7A, 0x36, 0xCA, 0x86,
+      0x36, 0x7A, 0xB6, 0xD7, 0x4A, 0x29, 0xD7, 0xB6,
+      0x29, 0x4A, 0xC8, 0xD7, 0x38, 0x29, 0xD7, 0xC8,
+      0x29, 0x38, 0xA4, 0xD8, 0x5C, 0x28, 0xD8, 0xA4,
+      0x28, 0x5C, 0x6C, 0xC1, 0x94, 0x3F, 0xC1, 0x6C,
+      0x3F, 0x94, 0xD9, 0xD9, 0x27, 0x27, 0x80, 0x80, },
+    { 0x80, 0x80, 0x85, 0x85, 0x7B, 0x7B, 0x7E, 0x87,
+      0x82, 0x79, 0x87, 0x7E, 0x79, 0x82, 0x8F, 0x8F,
+      0x71, 0x71, 0x84, 0x8F, 0x7C, 0x71, 0x8F, 0x84,
+      0x71, 0x7C, 0x75, 0x8B, 0x8B, 0x75, 0x8B, 0x75,
+      0x75, 0x8B, 0x8E, 0x9A, 0x72, 0x66, 0x9A, 0x8E,
+      0x66, 0x72, 0x7B, 0x93, 0x85, 0x6D, 0x93, 0x7B,
+      0x6D, 0x85, 0x9B, 0x9B, 0x65, 0x65, 0x82, 0x9D,
+      0x7E, 0x63, 0x9D, 0x82, 0x63, 0x7E, 0x9B, 0xA8,
+      0x65, 0x58, 0xA8, 0x9B, 0x58, 0x65, 0xA9, 0xA9,
+      0x57, 0x57, 0x8D, 0xAA, 0x73, 0x56, 0xAA, 0x8D,
+      0x56, 0x73, 0x6E, 0x99, 0x92, 0x67, 0x99, 0x6E,
+      0x67, 0x92, 0x76, 0xA2, 0x8A, 0x5E, 0xA2, 0x76,
+      0x5E, 0x8A, 0x7F, 0xAF, 0x81, 0x51, 0xAF, 0x7F,
+      0x51, 0x81, 0xAB, 0xBA, 0x55, 0x46, 0xBA, 0xAB,
+      0x46, 0x55, 0x9A, 0xBB, 0x66, 0x45, 0xBB, 0x9A,
+      0x45, 0x66, 0xBB, 0xBB, 0x45, 0x45, 0x60, 0xA0,
+      0xA0, 0x60, 0xA0, 0x60, 0x60, 0xA0, 0x8B, 0xBE,
+      0x75, 0x42, 0xBE, 0x8B, 0x42, 0x75, 0x66, 0xAA,
+      0x9A, 0x56, 0xAA, 0x66, 0x56, 0x9A, 0x70, 0xB5,
+      0x90, 0x4B, 0xB5, 0x70, 0x4B, 0x90, 0xBE, 0xCF,
+      0x42, 0x31, 0xCF, 0xBE, 0x31, 0x42, 0xAB, 0xD0,
+      0x55, 0x30, 0xD0, 0xAB, 0x30, 0x55, 0xD1, 0xD1,
+      0x2F, 0x2F, 0x9A, 0xD3, 0x66, 0x2D, 0xD3, 0x9A,
+      0x2D, 0x66, 0x7B, 0xC5, 0x85, 0x3B, 0xC5, 0x7B,
+      0x3B, 0x85, 0x54, 0xB4, 0xAC, 0x4C, 0xB4, 0x54,
+      0x4C, 0xAC, 0x5E, 0xBE, 0xA2, 0x42, 0xBE, 0x5E,
+      0x42, 0xA2, 0x87, 0xD8, 0x79, 0x28, 0xD8, 0x87,
+      0x28, 0x79, 0xC0, 0xE8, 0x40, 0x18, 0xE8, 0xC0,
+      0x18, 0x40, 0xD5, 0xE8, 0x2B, 0x18, 0xE8, 0xD5,
+      0x18, 0x2B, 0xAB, 0xE9, 0x55, 0x17, 0xE9, 0xAB,
+      0x17, 0x55, 0x68, 0xCD, 0x98, 0x33, 0xCD, 0x68,
+      0x33, 0x98, 0xEA, 0xEA, 0x16, 0x16, 0x80, 0x80, },
+    { 0x80, 0x80, 0x86, 0x86, 0x7A, 0x7A, 0x7E, 0x88,
+      0x82, 0x78, 0x88, 0x7E, 0x78, 0x82, 0x92, 0x92,
+      0x6E, 0x6E, 0x85, 0x92, 0x7B, 0x6E, 0x92, 0x85,
+      0x6E, 0x7B, 0x73, 0x8D, 0x8D, 0x73, 0x8D, 0x73,
+      0x73, 0x8D, 0x91, 0x9E, 0x6F, 0x62, 0x9E, 0x91,
+      0x62, 0x6F, 0x79, 0x97, 0x87, 0x69, 0x97, 0x79,
+      0x69, 0x87, 0xA0, 0xA0, 0x60, 0x60, 0x83, 0xA2,
+      0x7D, 0x5E, 0xA2, 0x83, 0x5E, 0x7D, 0xA0, 0xB0,
+      0x60, 0x50, 0xB0, 0xA0, 0x50, 0x60, 0xB1, 0xB1,
+      0x4F, 0x4F, 0x8F, 0xB2, 0x71, 0x4E, 0xB2, 0x8F,
+      0x4E, 0x71, 0x6B, 0x9E, 0x95, 0x62, 0x9E, 0x6B,
+      0x62, 0x95, 0x74, 0xA9, 0x8C, 0x57, 0xA9, 0x74,
+      0x57, 0x8C, 0x7F, 0xB8, 0x81, 0x48, 0xB8, 0x7F,
+      0x48, 0x81, 0xB4, 0xC5, 0x4C, 0x3B, 0xC5, 0xB4,
+      0x3B, 0x4C, 0x9F, 0xC6, 0x61, 0x3A, 0xC6, 0x9F,
+      0x3A, 0x61, 0xC6, 0xC6, 0x3A, 0x3A, 0x59, 0xA7,
+      0xA7, 0x59, 0xA7, 0x59, 0x59, 0xA7, 0x8D, 0xCA,
+      0x73, 0x36, 0xCA, 0x8D, 0x36, 0x73, 0x61, 0xB2,
+      0x9F, 0x4E, 0xB2, 0x61, 0x4E, 0x9F, 0x6D, 0xBF,
+      0x93, 0x41, 0xBF, 0x6D, 0x41, 0x93, 0xCA, 0xDF,
+      0x36, 0x21, 0xDF, 0xCA, 0x21, 0x36, 0xB3, 0xDF,
+      0x4D, 0x21, 0xDF, 0xB3, 0x21, 0x4D, 0xE1, 0xE1,
+      0x1F, 0x1F, 0x9F, 0xE3, 0x61, 0x1D, 0xE3, 0x9F,
+      0x1D, 0x61, 0x7A, 0xD3, 0x86, 0x2D, 0xD3, 0x7A,
+      0x2D, 0x86, 0x4C, 0xBE, 0xB4, 0x42, 0xBE, 0x4C,
+      0x42, 0xB4, 0x57, 0xCA, 0xA9, 0x36, 0xCA, 0x57,
+      0x36, 0xA9, 0x88, 0xE9, 0x78, 0x17, 0xE9, 0x88,
+      0x17, 0x78, 0xCC, 0xFB, 0x34, 0x05, 0xFB, 0xCC,
+      0x05, 0x34, 0xE6, 0xFB, 0x1A, 0x05, 0xFB, 0xE6,
+      0x05, 0x1A, 0xB4, 0xFD, 0x4C, 0x03, 0xFD, 0xB4,
+      0x03, 0x4C, 0x63, 0xDC, 0x9D, 0x24, 0xDC, 0x63,
+      0x24, 0x9D, 0xFE, 0xFE, 0x02, 0x02, 0x80, 0x80, },
+    { 0x80, 0x80, 0x87, 0x87, 0x79, 0x79, 0x7E, 0x89,
+      0x82, 0x77, 0x89, 0x7E, 0x77, 0x82, 0x95, 0x95,
+      0x6B, 0x6B, 0x86, 0x96, 0x7A, 0x6A, 0x96, 0x86,
+      0x6A, 0x7A, 0x70, 0x90, 0x90, 0x70, 0x90, 0x70,
+      0x70, 0x90, 0x94, 0xA4, 0x6C, 0x5C, 0xA4, 0x94,
+      0x5C, 0x6C, 0x78, 0x9B, 0x88, 0x65, 0x9B, 0x78,
+      0x65, 0x88, 0xA6, 0xA6, 0x5A, 0x5A, 0x83, 0xA9,
+      0x7D, 0x57, 0xA9, 0x83, 0x57, 0x7D, 0xA6, 0xB9,
+      0x5A, 0x47, 0xB9, 0xA6, 0x47, 0x5A, 0xBA, 0xBA,
+      0x46, 0x46, 0x92, 0xBC, 0x6E, 0x44, 0xBC, 0x92,
+      0x44, 0x6E, 0x67, 0xA3, 0x99, 0x5D, 0xA3, 0x67,
+      0x5D, 0x99, 0x72, 0xB0, 0x8E, 0x50, 0xB0, 0x72,
+      0x50, 0x8E, 0x7F, 0xC3, 0x81, 0x3D, 0xC3, 0x7F,
+      0x3D, 0x81, 0xBE, 0xD2, 0x42, 0x2E, 0xD2, 0xBE,
+      0x2E, 0x42, 0xA5, 0xD4, 0x5B, 0x2C, 0xD4, 0xA5,
+      0x2C, 0x5B, 0xD4, 0xD4, 0x2C, 0x2C, 0x52, 0xAE,
+      0xAE, 0x52, 0xAE, 0x52, 0x52, 0xAE, 0x8F, 0xD8,
+      0x71, 0x28, 0xD8, 0x8F, 0x28, 0x71, 0x5B, 0xBB,
+      0xA5, 0x45, 0xBB, 0x5B, 0x45, 0xA5, 0x69, 0xCB,
+      0x97, 0x35, 0xCB, 0x69, 0x35, 0x97, 0xD8, 0xF0,
+      0x28, 0x10, 0xF0, 0xD8, 0x10, 0x28, 0xBD, 0xF1,
+      0x43, 0x0F, 0xF1, 0xBD, 0x0F, 0x43, 0xF3, 0xF3,
+      0x0D, 0x0D, 0xA5, 0xF6, 0x5B, 0x0A, 0xF6, 0xA5,
+      0x0A, 0x5B, 0x78, 0xE2, 0x88, 0x1E, 0xE2, 0x78,
+      0x1E, 0x88, 0x42, 0xC9, 0xBE, 0x37, 0xC9, 0x42,
+      0x37, 0xBE, 0x4F, 0xD8, 0xB1, 0x28, 0xD8, 0x4F,
+      0x28, 0xB1, 0x8A, 0xFD, 0x76, 0x03, 0xFD, 0x8A,
+      0x03, 0x76, 0xDB, 0xFF, 0x25, 0x01, 0xFF, 0xDB,
+      0x01, 0x25, 0xF9, 0xFF, 0x07, 0x01, 0xFF, 0xF9,
+      0x01, 0x07, 0xBE, 0xFF, 0x42, 0x01, 0xFF, 0xBE,
+      0x01, 0x42, 0x5E, 0xED, 0xA2, 0x13, 0xED, 0x5E,
+      0x13, 0xA2, 0xFF, 0xFF, 0x01, 0x01, 0x80, 0x80, },
 };
 
 #endif /* AVCODEC_INDEO2DATA_H */