diff --git a/src/coding/acm_decoder.c b/src/coding/acm_decoder.c
index edc53d74..e1dd102c 100644
--- a/src/coding/acm_decoder.c
+++ b/src/coding/acm_decoder.c
@@ -817,23 +817,76 @@ void acm_reset(ACMStream *acm)
     memset(acm->wrapbuf, 0, acm->wrapbuf_len * sizeof(int));
 }
 
-/* interface to vgmstream */
-void decode_acm(ACMStream * acm, sample * outbuf,
-        int32_t samples_to_do, int channelspacing) {
+
+/***********************************************
+ * interface to vgmstream
+ ***********************************************/
+
+mus_acm_codec_data *init_acm(int files) {
+    mus_acm_codec_data* data = NULL;
+
+    if (files == 0)
+        goto fail;
+
+    data = calloc(1,sizeof(mus_acm_codec_data));
+    if (!data) goto fail;
+
+    data->files = calloc(files,sizeof(ACMStream *));
+    if (!data->files) goto fail;
+
+    data->file_count = files;
+    data->current_file = 0;
+
+    return data;
+
+fail:
+    free_acm(data);
+    return NULL;
+}
+
+void decode_acm(ACMStream * acm, sample * outbuf, int32_t samples_to_do, int channelspacing) {
     int32_t samples_read = 0;
     while (samples_read < samples_to_do) {
-        int32_t bytes_read_just_now;
-        bytes_read_just_now = 
-            acm_read(acm,(char*)(
-                        outbuf+samples_read*channelspacing),
-                    (samples_to_do-samples_read)*sizeof(sample)*
-                    channelspacing,0,2,1);
+        int32_t bytes_read_just_now = acm_read(
+                acm,
+                (char*)(outbuf+samples_read*channelspacing),
+                (samples_to_do-samples_read)*sizeof(sample)*channelspacing,
+                0,2,1);
 
         if (bytes_read_just_now > 0) {
-            samples_read +=
-                bytes_read_just_now/sizeof(sample)/channelspacing;
+            samples_read += bytes_read_just_now/sizeof(sample)/channelspacing;
         } else {
             return;
         }
     }
 }
+
+void reset_acm(VGMSTREAM *vgmstream) {
+    mus_acm_codec_data *data = vgmstream->codec_data;
+    int i;
+    if (data) {
+        data->current_file = 0;
+        for (i=0;i<data->file_count;i++) {
+            acm_reset(data->files[i]);
+        }
+    }
+}
+
+void free_acm(mus_acm_codec_data *data) {
+    if (data) {
+        if (data->files) {
+            int i;
+            for (i = 0; i < data->file_count; i++) {
+                /* shouldn't be duplicates */
+                if (data->files[i]) {
+                    acm_close(data->files[i]);
+                }
+
+            }
+            free(data->files);
+        }
+
+        free(data);
+    }
+}
+
diff --git a/src/coding/coding.h b/src/coding/coding.h
index b54c7631..4488dace 100644
--- a/src/coding/coding.h
+++ b/src/coding/coding.h
@@ -102,7 +102,10 @@ void decode_cbd2_int(VGMSTREAMCHANNEL * stream, sample * outbuf, int channelspac
 void decode_ws(VGMSTREAM * vgmstream, int channel, sample * outbuf, int channelspacing, int32_t first_sample, int32_t samples_to_do);
 
 /* acm_decoder */
+mus_acm_codec_data *init_acm(int files);
 void decode_acm(ACMStream * acm, sample * outbuf, int32_t samples_to_do, int channelspacing);
+void reset_acm(VGMSTREAM *vgmstream);
+void free_acm(mus_acm_codec_data *data);
 
 /* nwa_decoder */
 void decode_nwa(NWAData *nwa, sample *outbuf, int32_t samples_to_do);
diff --git a/src/meta/acm.c b/src/meta/acm.c
index 45ed0541..1a3bd426 100644
--- a/src/meta/acm.c
+++ b/src/meta/acm.c
@@ -1,10 +1,8 @@
-#include "../vgmstream.h"
 #include "meta.h"
-#include "../util.h"
+#include "../coding/coding.h"
 #include "../coding/acm_decoder.h"
 
-/* InterPlay ACM */
-/* The real work is done by libacm */
+/* ACM - InterPlay infinity engine games [Planescape: Torment (PC), Baldur's Gate (PC)] */
 VGMSTREAM * init_vgmstream_acm(STREAMFILE *streamFile) {
     VGMSTREAM * vgmstream = NULL;
     int loop_flag = 0, channel_count, sample_rate, num_samples;
@@ -19,15 +17,8 @@ VGMSTREAM * init_vgmstream_acm(STREAMFILE *streamFile) {
 
 
     /* init decoder */
-    {
-        data = calloc(1,sizeof(mus_acm_codec_data));
-        if (!data) goto fail;
-
-        data->current_file = 0;
-        data->file_count = 1;
-        data->files = calloc(data->file_count,sizeof(ACMStream *));
-        if (!data->files) goto fail;
-    }
+    data = init_acm(1);
+    if (!data) goto fail;
 
     /* open and parse the file before creating the vgmstream */
     {
@@ -62,16 +53,7 @@ VGMSTREAM * init_vgmstream_acm(STREAMFILE *streamFile) {
     return vgmstream;
 
 fail:
-    if (data && (!vgmstream || !vgmstream->codec_data)) {
-        if (data) {
-            int i;
-            for (i = 0; i < data->file_count; i++) {
-                acm_close(data->files[i]);
-            }
-            free(data->files);
-            free(data);
-        }
-    }
+    free_acm(data);
     close_vgmstream(vgmstream);
     return NULL;
 }
diff --git a/src/vgmstream.c b/src/vgmstream.c
index 1aca8564..13ce0774 100644
--- a/src/vgmstream.c
+++ b/src/vgmstream.c
@@ -571,14 +571,7 @@ void reset_vgmstream(VGMSTREAM * vgmstream) {
 #endif
 
     if (vgmstream->coding_type==coding_ACM) {
-        mus_acm_codec_data *data = vgmstream->codec_data;
-        int i;
-        if (data) {
-            data->current_file = 0;
-            for (i=0;i<data->file_count;i++) {
-                acm_reset(data->files[i]);
-            }
-        }
+        reset_acm(vgmstream);
     }
 
     if (
@@ -764,25 +757,8 @@ void close_vgmstream(VGMSTREAM * vgmstream) {
 #endif
 
     if (vgmstream->coding_type==coding_ACM) {
-        mus_acm_codec_data *data = (mus_acm_codec_data *) vgmstream->codec_data;
-
-        if (data) {
-            if (data->files) {
-                int i;
-                for (i=0; i<data->file_count; i++) {
-                    /* shouldn't be duplicates */
-                    if (data->files[i]) {
-                        acm_close(data->files[i]);
-                        data->files[i] = NULL;
-                    }
-                }
-                free(data->files);
-                data->files = NULL;
-            }
-
-            free(vgmstream->codec_data);
-            vgmstream->codec_data = NULL;
-        }
+        free_acm(vgmstream->codec_data);
+        vgmstream->codec_data = NULL;
     }
 
     if (
@@ -1818,10 +1794,10 @@ void decode_vgmstream(VGMSTREAM * vgmstream, int samples_written, int samples_to
                           vgmstream->channels);
             break;
 #endif
-        case coding_ACM: {
+        case coding_ACM: { //single ACM
             mus_acm_codec_data *data = vgmstream->codec_data;
             ACMStream *acm;
-            
+
             acm = data->files[data->current_file];
             decode_acm(acm,
                     buffer+samples_written*vgmstream->channels,