diff --git a/Changelog b/Changelog
index b75d2b6b96..002fccb5cf 100644
--- a/Changelog
+++ b/Changelog
@@ -66,6 +66,7 @@ version <next>:
 - asubboost filter
 - Pro Pinball Series Soundbank demuxer
 - pcm_rechunk bitstream filter
+- Simon & Schuster Interactive ADPCM encoder
 
 
 version 4.2:
diff --git a/doc/general.texi b/doc/general.texi
index 4aaf506e56..9b0ee96752 100644
--- a/doc/general.texi
+++ b/doc/general.texi
@@ -1108,7 +1108,7 @@ following image formats are supported:
 @item ADPCM IMA Funcom       @tab     @tab  X
 @item ADPCM IMA High Voltage Software ALP   @tab     @tab  X
 @item ADPCM IMA QuickTime    @tab  X  @tab  X
-@item ADPCM IMA Simon & Schuster Interactive   @tab  @tab  X
+@item ADPCM IMA Simon & Schuster Interactive   @tab  X  @tab  X
 @item ADPCM IMA Ubisoft APM  @tab     @tab X
 @item ADPCM IMA Loki SDL MJPEG  @tab     @tab  X
 @item ADPCM IMA WAV          @tab  X  @tab  X
diff --git a/libavcodec/Makefile b/libavcodec/Makefile
index 38f6f07680..2fab8dc40b 100644
--- a/libavcodec/Makefile
+++ b/libavcodec/Makefile
@@ -856,6 +856,7 @@ 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-$(CONFIG_ADPCM_IMA_SSI_ENCODER)      += adpcmenc.o adpcm_data.o
 OBJS-$(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
diff --git a/libavcodec/adpcmenc.c b/libavcodec/adpcmenc.c
index 668939c778..d1194c1f8f 100644
--- a/libavcodec/adpcmenc.c
+++ b/libavcodec/adpcmenc.c
@@ -77,6 +77,15 @@ static av_cold int adpcm_encode_init(AVCodecContext *avctx)
         return AVERROR(EINVAL);
     }
 
+    if (avctx->trellis && avctx->codec->id == AV_CODEC_ID_ADPCM_IMA_SSI) {
+        /*
+         * The current trellis implementation doesn't work for extended
+         * runs of samples without periodic resets. Disallow it.
+         */
+        av_log(avctx, AV_LOG_ERROR, "trellis not supported\n");
+        return AVERROR(EINVAL);
+    }
+
     if (avctx->trellis) {
         int frontier  = 1 << avctx->trellis;
         int max_paths =  frontier * FREEZE_INTERVAL;
@@ -139,6 +148,10 @@ static av_cold int adpcm_encode_init(AVCodecContext *avctx)
         }
         avctx->frame_size = 512 * (avctx->sample_rate / 11025);
         break;
+    case AV_CODEC_ID_ADPCM_IMA_SSI:
+        avctx->frame_size = BLKSIZE * 2 / avctx->channels;
+        avctx->block_align = BLKSIZE;
+        break;
     default:
         ret = AVERROR(EINVAL);
         goto error;
@@ -484,6 +497,8 @@ static int adpcm_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
 
     if (avctx->codec_id == AV_CODEC_ID_ADPCM_SWF)
         pkt_size = (2 + avctx->channels * (22 + 4 * (frame->nb_samples - 1)) + 7) / 8;
+    else if (avctx->codec_id == AV_CODEC_ID_ADPCM_IMA_SSI)
+        pkt_size = (frame->nb_samples * avctx->channels) / 2;
     else
         pkt_size = avctx->block_align;
     if ((ret = ff_alloc_packet2(avctx, avpkt, pkt_size, 0)) < 0)
@@ -568,6 +583,22 @@ static int adpcm_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
         flush_put_bits(&pb);
         break;
     }
+    case AV_CODEC_ID_ADPCM_IMA_SSI:
+    {
+        PutBitContext pb;
+        init_put_bits(&pb, dst, pkt_size);
+
+        av_assert0(avctx->trellis == 0);
+
+        for (i = 0; i < frame->nb_samples; i++) {
+            for (ch = 0; ch < avctx->channels; ch++) {
+                put_bits(&pb, 4, adpcm_ima_qt_compress_sample(c->status + ch, *samples++));
+            }
+        }
+
+        flush_put_bits(&pb);
+        break;
+    }
     case AV_CODEC_ID_ADPCM_SWF:
     {
         PutBitContext pb;
@@ -706,21 +737,23 @@ static const enum AVSampleFormat sample_fmts_p[] = {
     AV_SAMPLE_FMT_S16P, AV_SAMPLE_FMT_NONE
 };
 
-#define ADPCM_ENCODER(id_, name_, sample_fmts_, long_name_) \
-AVCodec ff_ ## name_ ## _encoder = {                        \
-    .name           = #name_,                               \
-    .long_name      = NULL_IF_CONFIG_SMALL(long_name_),     \
-    .type           = AVMEDIA_TYPE_AUDIO,                   \
-    .id             = id_,                                  \
-    .priv_data_size = sizeof(ADPCMEncodeContext),           \
-    .init           = adpcm_encode_init,                    \
-    .encode2        = adpcm_encode_frame,                   \
-    .close          = adpcm_encode_close,                   \
-    .sample_fmts    = sample_fmts_,                         \
+#define ADPCM_ENCODER(id_, name_, sample_fmts_, capabilities_, long_name_) \
+AVCodec ff_ ## name_ ## _encoder = {                                       \
+    .name           = #name_,                                              \
+    .long_name      = NULL_IF_CONFIG_SMALL(long_name_),                    \
+    .type           = AVMEDIA_TYPE_AUDIO,                                  \
+    .id             = id_,                                                 \
+    .priv_data_size = sizeof(ADPCMEncodeContext),                          \
+    .init           = adpcm_encode_init,                                   \
+    .encode2        = adpcm_encode_frame,                                  \
+    .close          = adpcm_encode_close,                                  \
+    .sample_fmts    = sample_fmts_,                                        \
+    .capabilities   = capabilities_,                                       \
 }
 
-ADPCM_ENCODER(AV_CODEC_ID_ADPCM_IMA_QT,  adpcm_ima_qt,  sample_fmts_p, "ADPCM IMA QuickTime");
-ADPCM_ENCODER(AV_CODEC_ID_ADPCM_IMA_WAV, adpcm_ima_wav, sample_fmts_p, "ADPCM IMA WAV");
-ADPCM_ENCODER(AV_CODEC_ID_ADPCM_MS,      adpcm_ms,      sample_fmts,   "ADPCM Microsoft");
-ADPCM_ENCODER(AV_CODEC_ID_ADPCM_SWF,     adpcm_swf,     sample_fmts,   "ADPCM Shockwave Flash");
-ADPCM_ENCODER(AV_CODEC_ID_ADPCM_YAMAHA,  adpcm_yamaha,  sample_fmts,   "ADPCM Yamaha");
+ADPCM_ENCODER(AV_CODEC_ID_ADPCM_IMA_QT,  adpcm_ima_qt,  sample_fmts_p, 0,                             "ADPCM IMA QuickTime");
+ADPCM_ENCODER(AV_CODEC_ID_ADPCM_IMA_SSI, adpcm_ima_ssi, sample_fmts,   AV_CODEC_CAP_SMALL_LAST_FRAME, "ADPCM IMA Simon & Schuster Interactive");
+ADPCM_ENCODER(AV_CODEC_ID_ADPCM_IMA_WAV, adpcm_ima_wav, sample_fmts_p, 0,                             "ADPCM IMA WAV");
+ADPCM_ENCODER(AV_CODEC_ID_ADPCM_MS,      adpcm_ms,      sample_fmts,   0,                             "ADPCM Microsoft");
+ADPCM_ENCODER(AV_CODEC_ID_ADPCM_SWF,     adpcm_swf,     sample_fmts,   0,                             "ADPCM Shockwave Flash");
+ADPCM_ENCODER(AV_CODEC_ID_ADPCM_YAMAHA,  adpcm_yamaha,  sample_fmts,   0,                             "ADPCM Yamaha");
diff --git a/libavcodec/allcodecs.c b/libavcodec/allcodecs.c
index 54d40ebdbc..a14bdf6a5d 100644
--- a/libavcodec/allcodecs.c
+++ b/libavcodec/allcodecs.c
@@ -618,6 +618,7 @@ 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_ssi_encoder;
 extern AVCodec ff_adpcm_ima_smjpeg_decoder;
 extern AVCodec ff_adpcm_ima_wav_encoder;
 extern AVCodec ff_adpcm_ima_wav_decoder;
diff --git a/libavcodec/utils.c b/libavcodec/utils.c
index 91b271a717..1f2f0b60a7 100644
--- a/libavcodec/utils.c
+++ b/libavcodec/utils.c
@@ -1431,6 +1431,7 @@ int av_get_exact_bits_per_sample(enum AVCodecID codec_id)
     case AV_CODEC_ID_ADPCM_IMA_EA_SEAD:
     case AV_CODEC_ID_ADPCM_IMA_OKI:
     case AV_CODEC_ID_ADPCM_IMA_WS:
+    case AV_CODEC_ID_ADPCM_IMA_SSI:
     case AV_CODEC_ID_ADPCM_G722:
     case AV_CODEC_ID_ADPCM_YAMAHA:
     case AV_CODEC_ID_ADPCM_AICA:
diff --git a/libavcodec/version.h b/libavcodec/version.h
index 691320b63c..82255d7f38 100644
--- a/libavcodec/version.h
+++ b/libavcodec/version.h
@@ -28,7 +28,7 @@
 #include "libavutil/version.h"
 
 #define LIBAVCODEC_VERSION_MAJOR  58
-#define LIBAVCODEC_VERSION_MINOR  83
+#define LIBAVCODEC_VERSION_MINOR  84
 #define LIBAVCODEC_VERSION_MICRO 100
 
 #define LIBAVCODEC_VERSION_INT  AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \
