avcodec: add decoder for Simon & Schuster Interactive's ADPCM variant

Adds support for the ADPCM variant used by some Simon & Schuster
Interactive games such as Real War, and Real War: Rogue States.
Signed-off-by: Zane van Iperen <zane@zanevaniperen.com>
Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavcodec/Makefile

@@ -844,6 +844,7 @@ OBJS-$(CONFIG_ADPCM_IMA_OKI_DECODER)      += adpcm.o adpcm_data.o
 OBJS-$(CONFIG_ADPCM_IMA_QT_DECODER)       += adpcm.o adpcm_data.o
 OBJS-$(CONFIG_ADPCM_IMA_QT_ENCODER)       += adpcmenc.o adpcm_data.o
 OBJS-$(CONFIG_ADPCM_IMA_RAD_DECODER)      += adpcm.o adpcm_data.o
+OBJS-$(CONFIG_ADPCM_IMA_SSI_DECODER)      += adpcm.o adpcm_data.o
 OBJS-$(CONFIG_ADPCM_IMA_SMJPEG_DECODER)   += adpcm.o adpcm_data.o
 OBJS-$(CONFIG_ADPCM_IMA_WAV_DECODER)      += adpcm.o adpcm_data.o
 OBJS-$(CONFIG_ADPCM_IMA_WAV_ENCODER)      += adpcmenc.o adpcm_data.o

libavcodec/adpcm.c

@@ -13,6 +13,7 @@
  * MAXIS EA ADPCM decoder by Robert Marston (rmarston@gmail.com)
  * THP ADPCM decoder by Marco Gerards (mgerards@xs4all.nl)
  * Argonaut Games ADPCM decoder by Zane van Iperen (zane@zanevaniperen.com)
+ * Simon & Schuster Interactive ADPCM decoder by Zane van Iperen (zane@zanevaniperen.com)
  *
  * This file is part of FFmpeg.
  *
@@ -620,6 +621,7 @@ static int get_nb_samples(AVCodecContext *avctx, GetByteContext *gb,
     case AV_CODEC_ID_ADPCM_IMA_WS:
     case AV_CODEC_ID_ADPCM_YAMAHA:
     case AV_CODEC_ID_ADPCM_AICA:
+    case AV_CODEC_ID_ADPCM_IMA_SSI:
         nb_samples = buf_size * 2 / ch;
         break;
     }
@@ -1172,6 +1174,13 @@ static int adpcm_decode_frame(AVCodecContext *avctx, void *data,
             *samples++ = adpcm_ima_expand_nibble(&c->status[st], v & 0x0F, 3);
         }
         break;
+    case AV_CODEC_ID_ADPCM_IMA_SSI:
+        while (bytestream2_get_bytes_left(&gb) > 0) {
+            int v = bytestream2_get_byteu(&gb);
+            *samples++ = adpcm_ima_qt_expand_nibble(&c->status[0],  v >> 4  , 3);
+            *samples++ = adpcm_ima_qt_expand_nibble(&c->status[st], v & 0x0F, 3);
+        }
+        break;
     case AV_CODEC_ID_ADPCM_IMA_OKI:
         while (bytestream2_get_bytes_left(&gb) > 0) {
             int v = bytestream2_get_byteu(&gb);
@@ -1906,6 +1915,7 @@ ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_ISS,     sample_fmts_s16,  adpcm_ima_iss,
 ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_OKI,     sample_fmts_s16,  adpcm_ima_oki,     "ADPCM IMA Dialogic OKI");
 ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_QT,      sample_fmts_s16p, adpcm_ima_qt,      "ADPCM IMA QuickTime");
 ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_RAD,     sample_fmts_s16,  adpcm_ima_rad,     "ADPCM IMA Radical");
+ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_SSI,     sample_fmts_s16,  adpcm_ima_ssi,     "ADPCM IMA Simon & Schuster Interactive");
 ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_SMJPEG,  sample_fmts_s16,  adpcm_ima_smjpeg,  "ADPCM IMA Loki SDL MJPEG");
 ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_WAV,     sample_fmts_s16p, adpcm_ima_wav,     "ADPCM IMA WAV");
 ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_WS,      sample_fmts_both, adpcm_ima_ws,      "ADPCM IMA Westwood");

libavcodec/allcodecs.c

@@ -609,6 +609,7 @@ extern AVCodec ff_adpcm_ima_oki_decoder;
 extern AVCodec ff_adpcm_ima_qt_encoder;
 extern AVCodec ff_adpcm_ima_qt_decoder;
 extern AVCodec ff_adpcm_ima_rad_decoder;
+extern AVCodec ff_adpcm_ima_ssi_decoder;
 extern AVCodec ff_adpcm_ima_smjpeg_decoder;
 extern AVCodec ff_adpcm_ima_wav_encoder;
 extern AVCodec ff_adpcm_ima_wav_decoder;

libavcodec/avcodec.h

@@ -546,6 +546,7 @@ enum AVCodecID {
     AV_CODEC_ID_ADPCM_MTAF,
     AV_CODEC_ID_ADPCM_AGM,
     AV_CODEC_ID_ADPCM_ARGO,
+    AV_CODEC_ID_ADPCM_IMA_SSI,
 
     /* AMR */
     AV_CODEC_ID_AMR_NB = 0x12000,

libavcodec/codec_desc.c

@@ -2304,6 +2304,13 @@ static const AVCodecDescriptor codec_descriptors[] = {
         .long_name = NULL_IF_CONFIG_SMALL("ADPCM Argonaut Games"),
         .props     = AV_CODEC_PROP_INTRA_ONLY | AV_CODEC_PROP_LOSSY,
     },
+    {
+        .id        = AV_CODEC_ID_ADPCM_IMA_SSI,
+        .type      = AVMEDIA_TYPE_AUDIO,
+        .name      = "adpcm_ima_ssi",
+        .long_name = NULL_IF_CONFIG_SMALL("ADPCM IMA Simon & Schuster Interactive"),
+        .props     = AV_CODEC_PROP_INTRA_ONLY | AV_CODEC_PROP_LOSSY,
+    },
 
     /* AMR */
     {

libavcodec/version.h

@@ -28,8 +28,8 @@
 #include "libavutil/version.h"
 
 #define LIBAVCODEC_VERSION_MAJOR  58
-#define LIBAVCODEC_VERSION_MINOR  67
-#define LIBAVCODEC_VERSION_MICRO 101
+#define LIBAVCODEC_VERSION_MINOR  68
+#define LIBAVCODEC_VERSION_MICRO 100
 
 #define LIBAVCODEC_VERSION_INT  AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \
                                                LIBAVCODEC_VERSION_MINOR, \