avcodec: add support for Cunning Developments' ADPCM

Signed-off-by: Zane van Iperen <zane@zanevaniperen.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

1 files changed, 13 insertions, 0 deletions

diff --git a/libavcodec/adpcm_data.c b/libavcodec/adpcm_data.c
index 4cce0a5857..cb9d20948e 100644
--- a/libavcodec/adpcm_data.c
+++ b/libavcodec/adpcm_data.c
@@ -177,3 +177,16 @@ const int16_t ff_adpcm_mtaf_stepsize[32][16] = {
     {   424,  1273,  2121,  2970,  3819,  4668,  5516,  6365,
        -424, -1273, -2121, -2970, -3819, -4668, -5516, -6365, },
 };
+
+const int8_t ff_adpcm_ima_cunning_index_table[8] = {
+    -1, -1, -1, -1, 1, 2, 3, 4,
+};
+
+const int16_t ff_adpcm_ima_cunning_step_table[61] = {
+       1,    1,   1,      1,     2,     2,     3,     3,    4,      5,
+       6,    7,   8,     10,    12,    14,    16,    20,    24,    28,
+      32,   40,  48,     56,    64,    80,    96,   112,   128,   160,
+     192,  224,  256,   320,   384,   448,   512,   640,   768,   896,
+    1024, 1280, 1536,  1792,  2048,  2560,  3072,  3584,  4096,  5120,
+    6144, 7168, 8192, 10240, 12288, 14336, 16384, 20480, 24576, 28672, 0
+};