adpcm: split ADPCM encoders and decoders into separate files.

Move shared tables to a separate file as well.

1 files changed, 78 insertions, 0 deletions

diff --git a/libavcodec/adpcm_data.c b/libavcodec/adpcm_data.c
new file mode 100644
index 0000000000..9dc5670bfc
--- /dev/null
+++ b/libavcodec/adpcm_data.c
@@ -0,0 +1,78 @@
+/*
+ * Copyright (c) 2001-2003 The ffmpeg Project
+ *
+ * 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
+ */
+
+/**
+ * @file
+ * ADPCM tables
+ */
+
+#include <stdint.h>
+
+/* ff_adpcm_step_table[] and ff_adpcm_index_table[] are from the ADPCM
+   reference source */
+/* This is the index table: */
+const int8_t ff_adpcm_index_table[16] = {
+    -1, -1, -1, -1, 2, 4, 6, 8,
+    -1, -1, -1, -1, 2, 4, 6, 8,
+};
+
+/**
+ * This is the step table. Note that many programs use slight deviations from
+ * this table, but such deviations are negligible:
+ */
+const int16_t ff_adpcm_step_table[89] = {
+    7, 8, 9, 10, 11, 12, 13, 14, 16, 17,
+    19, 21, 23, 25, 28, 31, 34, 37, 41, 45,
+    50, 55, 60, 66, 73, 80, 88, 97, 107, 118,
+    130, 143, 157, 173, 190, 209, 230, 253, 279, 307,
+    337, 371, 408, 449, 494, 544, 598, 658, 724, 796,
+    876, 963, 1060, 1166, 1282, 1411, 1552, 1707, 1878, 2066,
+    2272, 2499, 2749, 3024, 3327, 3660, 4026, 4428, 4871, 5358,
+    5894, 6484, 7132, 7845, 8630, 9493, 10442, 11487, 12635, 13899,
+    15289, 16818, 18500, 20350, 22385, 24623, 27086, 29794, 32767
+};
+
+/* These are for MS-ADPCM */
+/* ff_adpcm_AdaptationTable[], ff_adpcm_AdaptCoeff1[], and
+   ff_adpcm_AdaptCoeff2[] are from libsndfile */
+const int16_t ff_adpcm_AdaptationTable[] = {
+        230, 230, 230, 230, 307, 409, 512, 614,
+        768, 614, 512, 409, 307, 230, 230, 230
+};
+
+/** Divided by 4 to fit in 8-bit integers */
+const uint8_t ff_adpcm_AdaptCoeff1[] = {
+        64, 128, 0, 48, 60, 115, 98
+};
+
+/** Divided by 4 to fit in 8-bit integers */
+const int8_t ff_adpcm_AdaptCoeff2[] = {
+        0, -64, 0, 16, 0, -52, -58
+};
+
+const int16_t ff_adpcm_yamaha_indexscale[] = {
+    230, 230, 230, 230, 307, 409, 512, 614,
+    230, 230, 230, 230, 307, 409, 512, 614
+};
+
+const int8_t ff_adpcm_yamaha_difflookup[] = {
+    1, 3, 5, 7, 9, 11, 13, 15,
+    -1, -3, -5, -7, -9, -11, -13, -15
+};