avcodec: add support for Cunning Developments' ADPCM

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

Changelog

@@ -62,6 +62,7 @@ version <next>:
 - tmedian filter
 - maskedthreshold filter
 - Support for muxing pcm and pgs in m2ts
+- Cunning Developments ADPCM decoder
 
 
 version 4.2:

doc/general.texi

@@ -1102,6 +1102,7 @@ following image formats are supported:
 @item ADPCM G.726            @tab  X  @tab  X
 @item ADPCM IMA AMV          @tab     @tab  X
     @tab Used in AMV files
+@item ADPCM IMA Cunning Developments  @tab     @tab  X
 @item ADPCM IMA Electronic Arts EACS  @tab     @tab  X
 @item ADPCM IMA Electronic Arts SEAD  @tab     @tab  X
 @item ADPCM IMA Funcom       @tab     @tab  X

libavcodec/Makefile

@@ -843,6 +843,7 @@ OBJS-$(CONFIG_ADPCM_IMA_AMV_DECODER)      += adpcm.o adpcm_data.o
 OBJS-$(CONFIG_ADPCM_IMA_ALP_DECODER)      += adpcm.o adpcm_data.o
 OBJS-$(CONFIG_ADPCM_IMA_APC_DECODER)      += adpcm.o adpcm_data.o
 OBJS-$(CONFIG_ADPCM_IMA_APM_DECODER)      += adpcm.o adpcm_data.o
+OBJS-$(CONFIG_ADPCM_IMA_CUNNING_DECODER)  += adpcm.o adpcm_data.o
 OBJS-$(CONFIG_ADPCM_IMA_DAT4_DECODER)     += adpcm.o adpcm_data.o
 OBJS-$(CONFIG_ADPCM_IMA_DK3_DECODER)      += adpcm.o adpcm_data.o
 OBJS-$(CONFIG_ADPCM_IMA_DK4_DECODER)      += adpcm.o adpcm_data.o

libavcodec/adpcm.c

@@ -16,6 +16,7 @@
  * Simon & Schuster Interactive ADPCM decoder by Zane van Iperen (zane@zanevaniperen.com)
  * Ubisoft ADPCM decoder by Zane van Iperen (zane@zanevaniperen.com)
  * High Voltage Software ALP decoder by Zane van Iperen (zane@zanevaniperen.com)
+ * Cunning Developments decoder by Zane van Iperen (zane@zanevaniperen.com)
  *
  * This file is part of FFmpeg.
  *
@@ -109,6 +110,9 @@ static av_cold int adpcm_decode_init(AVCodecContext * avctx)
     unsigned int max_channels = 2;
 
     switch(avctx->codec->id) {
+    case AV_CODEC_ID_ADPCM_IMA_CUNNING:
+        max_channels = 1;
+        break;
     case AV_CODEC_ID_ADPCM_DTK:
     case AV_CODEC_ID_ADPCM_EA:
         min_channels = 2;
@@ -325,6 +329,26 @@ static inline int16_t adpcm_ima_mtf_expand_nibble(ADPCMChannelStatus *c, int nib
     return (int16_t)c->predictor;
 }
 
+static inline int16_t adpcm_ima_cunning_expand_nibble(ADPCMChannelStatus *c, int8_t nibble)
+{
+    int step_index;
+    int predictor;
+    int step;
+
+    nibble = sign_extend(nibble & 0xF, 4);
+
+    step = ff_adpcm_ima_cunning_step_table[c->step_index];
+    step_index = c->step_index + ff_adpcm_ima_cunning_index_table[abs(nibble)];
+    step_index = av_clip(step_index, 0, 60);
+
+    predictor = c->predictor + step * nibble;
+
+    c->predictor = av_clip_int16(predictor);
+    c->step_index = step_index;
+
+    return c->predictor;
+}
+
 static inline int16_t adpcm_ima_wav_expand_nibble(ADPCMChannelStatus *c, GetBitContext *gb, int bps)
 {
     int nibble, step_index, predictor, sign, delta, diff, step, shift;
@@ -713,6 +737,7 @@ static int get_nb_samples(AVCodecContext *avctx, GetByteContext *gb,
     /* simple 4-bit adpcm */
     case AV_CODEC_ID_ADPCM_CT:
     case AV_CODEC_ID_ADPCM_IMA_APC:
+    case AV_CODEC_ID_ADPCM_IMA_CUNNING:
     case AV_CODEC_ID_ADPCM_IMA_EA_SEAD:
     case AV_CODEC_ID_ADPCM_IMA_OKI:
     case AV_CODEC_ID_ADPCM_IMA_WS:
@@ -1304,6 +1329,13 @@ static int adpcm_decode_frame(AVCodecContext *avctx, void *data,
             samples += avctx->channels;
         }
         break;
+    case AV_CODEC_ID_ADPCM_IMA_CUNNING:
+        for (n = 0; n < nb_samples / 2; n++) {
+            int v = bytestream2_get_byteu(&gb);
+            *samples++ = adpcm_ima_cunning_expand_nibble(&c->status[0], v & 0x0F);
+            *samples++ = adpcm_ima_cunning_expand_nibble(&c->status[0], v >> 4);
+        }
+        break;
     case AV_CODEC_ID_ADPCM_IMA_OKI:
         for (n = nb_samples >> (1 - st); n > 0; n--) {
             int v = bytestream2_get_byteu(&gb);
@@ -2053,6 +2085,7 @@ ADPCM_DECODER(AV_CODEC_ID_ADPCM_EA_XAS,      sample_fmts_s16p, adpcm_ea_xas,
 ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_AMV,     sample_fmts_s16,  adpcm_ima_amv,     "ADPCM IMA AMV");
 ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_APC,     sample_fmts_s16,  adpcm_ima_apc,     "ADPCM IMA CRYO APC");
 ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_APM,     sample_fmts_s16,  adpcm_ima_apm,     "ADPCM IMA Ubisoft APM");
+ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_CUNNING, sample_fmts_s16,  adpcm_ima_cunning, "ADPCM IMA Cunning Developments");
 ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_DAT4,    sample_fmts_s16,  adpcm_ima_dat4,    "ADPCM IMA Eurocom DAT4");
 ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_DK3,     sample_fmts_s16,  adpcm_ima_dk3,     "ADPCM IMA Duck DK3");
 ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_DK4,     sample_fmts_s16,  adpcm_ima_dk4,     "ADPCM IMA Duck DK4");

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
+};

libavcodec/adpcm_data.h

@@ -42,5 +42,7 @@ extern const int16_t ff_adpcm_yamaha_indexscale[];
 extern const int8_t  ff_adpcm_yamaha_difflookup[];
 extern const int16_t ff_adpcm_afc_coeffs[2][16];
 extern const int16_t ff_adpcm_mtaf_stepsize[32][16];
+extern const int8_t  ff_adpcm_ima_cunning_index_table[8];
+extern const int16_t ff_adpcm_ima_cunning_step_table[61];
 
 #endif /* AVCODEC_ADPCM_DATA_H */

libavcodec/allcodecs.c

@@ -605,6 +605,7 @@ extern AVCodec ff_adpcm_ima_amv_decoder;
 extern AVCodec ff_adpcm_ima_alp_decoder;
 extern AVCodec ff_adpcm_ima_apc_decoder;
 extern AVCodec ff_adpcm_ima_apm_decoder;
+extern AVCodec ff_adpcm_ima_cunning_decoder;
 extern AVCodec ff_adpcm_ima_dat4_decoder;
 extern AVCodec ff_adpcm_ima_dk3_decoder;
 extern AVCodec ff_adpcm_ima_dk4_decoder;

libavcodec/codec_desc.c

@@ -2348,6 +2348,13 @@ static const AVCodecDescriptor codec_descriptors[] = {
         .long_name = NULL_IF_CONFIG_SMALL("ADPCM IMA Capcom's MT Framework"),
         .props     = AV_CODEC_PROP_INTRA_ONLY | AV_CODEC_PROP_LOSSY,
     },
+    {
+        .id        = AV_CODEC_ID_ADPCM_IMA_CUNNING,
+        .type      = AVMEDIA_TYPE_AUDIO,
+        .name      = "adpcm_ima_cunning",
+        .long_name = NULL_IF_CONFIG_SMALL("ADPCM IMA Cunning Developments"),
+        .props     = AV_CODEC_PROP_INTRA_ONLY | AV_CODEC_PROP_LOSSY,
+    },
 
     /* AMR */
     {

libavcodec/codec_id.h

@@ -382,6 +382,7 @@ enum AVCodecID {
     AV_CODEC_ID_ADPCM_IMA_APM,
     AV_CODEC_ID_ADPCM_IMA_ALP,
     AV_CODEC_ID_ADPCM_IMA_MTF,
+    AV_CODEC_ID_ADPCM_IMA_CUNNING,
 
     /* AMR */
     AV_CODEC_ID_AMR_NB = 0x12000,

libavcodec/version.h

@@ -28,7 +28,7 @@
 #include "libavutil/version.h"
 
 #define LIBAVCODEC_VERSION_MAJOR  58
-#define LIBAVCODEC_VERSION_MINOR  81
+#define LIBAVCODEC_VERSION_MINOR  82
 #define LIBAVCODEC_VERSION_MICRO 100
 
 #define LIBAVCODEC_VERSION_INT  AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \