avcodec: add decoder for Rayman 2's ADPCM variant

Adds support for the ADPCM variant used in Rayman 2's files.
Signed-off-by: Zane van Iperen <zane@zanevaniperen.com>

libavcodec/Makefile

@@ -835,6 +835,7 @@ OBJS-$(CONFIG_ADPCM_G726LE_DECODER)       += g726.o
 OBJS-$(CONFIG_ADPCM_G726LE_ENCODER)       += g726.o
 OBJS-$(CONFIG_ADPCM_IMA_AMV_DECODER)      += adpcm.o adpcm_data.o
 OBJS-$(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_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

@@ -14,6 +14,7 @@
  * 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)
+ * Ubisoft ADPCM decoder by Zane van Iperen (zane@zanevaniperen.com)
  *
  * This file is part of FFmpeg.
  *
@@ -150,6 +151,14 @@ static av_cold int adpcm_decode_init(AVCodecContext * avctx)
             c->status[1].predictor = av_clip_intp2(AV_RL32(avctx->extradata + 4), 18);
         }
         break;
+    case AV_CODEC_ID_ADPCM_IMA_APM:
+        if (avctx->extradata && avctx->extradata_size >= 16) {
+            c->status[0].predictor  = AV_RL32(avctx->extradata +  0);
+            c->status[0].step_index = AV_RL32(avctx->extradata +  4);
+            c->status[1].predictor  = AV_RL32(avctx->extradata +  8);
+            c->status[1].step_index = AV_RL32(avctx->extradata + 12);
+        }
+        break;
     case AV_CODEC_ID_ADPCM_IMA_WS:
         if (avctx->extradata && avctx->extradata_size >= 2)
             c->vqa_version = AV_RL16(avctx->extradata);
@@ -665,6 +674,7 @@ static int get_nb_samples(AVCodecContext *avctx, GetByteContext *gb,
     case AV_CODEC_ID_ADPCM_YAMAHA:
     case AV_CODEC_ID_ADPCM_AICA:
     case AV_CODEC_ID_ADPCM_IMA_SSI:
+    case AV_CODEC_ID_ADPCM_IMA_APM:
         nb_samples = buf_size * 2 / ch;
         break;
     }
@@ -1227,6 +1237,16 @@ static int adpcm_decode_frame(AVCodecContext *avctx, void *data,
             *samples++ = adpcm_ima_qt_expand_nibble(&c->status[st], v & 0x0F, 3);
         }
         break;
+    case AV_CODEC_ID_ADPCM_IMA_APM:
+        for (n = nb_samples / 2; n > 0; n--) {
+            for (channel = 0; channel < avctx->channels; channel++) {
+                int v = bytestream2_get_byteu(&gb);
+                *samples++  = adpcm_ima_qt_expand_nibble(&c->status[channel], v >> 4  , 3);
+                samples[st] = adpcm_ima_qt_expand_nibble(&c->status[channel], v & 0x0F, 3);
+            }
+            samples += avctx->channels;
+        }
+        break;
     case AV_CODEC_ID_ADPCM_IMA_OKI:
         while (bytestream2_get_bytes_left(&gb) > 0) {
             int v = bytestream2_get_byteu(&gb);
@@ -1965,6 +1985,7 @@ ADPCM_DECODER(AV_CODEC_ID_ADPCM_EA_R3,       sample_fmts_s16p, adpcm_ea_r3,
 ADPCM_DECODER(AV_CODEC_ID_ADPCM_EA_XAS,      sample_fmts_s16p, adpcm_ea_xas,      "ADPCM Electronic Arts 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_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/allcodecs.c

@@ -600,6 +600,7 @@ extern AVCodec ff_adpcm_g726le_encoder;
 extern AVCodec ff_adpcm_g726le_decoder;
 extern AVCodec ff_adpcm_ima_amv_decoder;
 extern AVCodec ff_adpcm_ima_apc_decoder;
+extern AVCodec ff_adpcm_ima_apm_decoder;
 extern AVCodec ff_adpcm_ima_dat4_decoder;
 extern AVCodec ff_adpcm_ima_dk3_decoder;
 extern AVCodec ff_adpcm_ima_dk4_decoder;

libavcodec/avcodec.h

@@ -549,6 +549,7 @@ enum AVCodecID {
     AV_CODEC_ID_ADPCM_ARGO,
     AV_CODEC_ID_ADPCM_IMA_SSI,
     AV_CODEC_ID_ADPCM_ZORK,
+    AV_CODEC_ID_ADPCM_IMA_APM,
 
     /* AMR */
     AV_CODEC_ID_AMR_NB = 0x12000,

libavcodec/codec_desc.c

@@ -2318,6 +2318,13 @@ static const AVCodecDescriptor codec_descriptors[] = {
         .long_name = NULL_IF_CONFIG_SMALL("ADPCM Zork"),
         .props     = AV_CODEC_PROP_INTRA_ONLY | AV_CODEC_PROP_LOSSY,
     },
+    {
+        .id        = AV_CODEC_ID_ADPCM_IMA_APM,
+        .type      = AVMEDIA_TYPE_AUDIO,
+        .name      = "adpcm_ima_apm",
+        .long_name = NULL_IF_CONFIG_SMALL("ADPCM IMA Ubisoft APM"),
+        .props     = AV_CODEC_PROP_INTRA_ONLY | AV_CODEC_PROP_LOSSY,
+    },
 
     /* AMR */
     {

libavcodec/version.h

@@ -28,7 +28,7 @@
 #include "libavutil/version.h"
 
 #define LIBAVCODEC_VERSION_MAJOR  58
-#define LIBAVCODEC_VERSION_MINOR  71
+#define LIBAVCODEC_VERSION_MINOR  72
 #define LIBAVCODEC_VERSION_MICRO 100
 
 #define LIBAVCODEC_VERSION_INT  AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \