1 files changed, 62 insertions, 0 deletions
diff --git a/lib/vgmstream/src/layout/interleave_byte.c b/lib/vgmstream/src/layout/interleave_byte.c
new file mode 100644
index 0000000000..c9f8eb0886
--- /dev/null
+++ b/lib/vgmstream/src/layout/interleave_byte.c
@@ -0,0 +1,62 @@
+#include "layout.h"
+#include "../vgmstream.h"
+
+/* for formats where the interleave is smaller than a frame, so we need to
+ * deinterleave in memory before passing it along to a specialized decoder which
+ * reads from memory
+ */
+
+/* just do one frame at a time */
+
+void render_vgmstream_interleave_byte(sample * buffer, int32_t sample_count, VGMSTREAM * vgmstream) {
+    /* frame sizes are much smaller than this */
+    uint8_t sample_data[0x400];
+    int samples_written=0;
+
+    int frame_size = get_vgmstream_frame_size(vgmstream);
+    int samples_per_frame = get_vgmstream_samples_per_frame(vgmstream);
+    int samples_this_block;
+
+    samples_this_block = samples_per_frame;
+
+    while (samples_written<sample_count) {
+        int samples_to_do; 
+
+        if (vgmstream->loop_flag && vgmstream_do_loop(vgmstream)) {
+            continue;
+        }
+
+        samples_to_do = vgmstream_samples_to_do(samples_this_block, samples_per_frame, vgmstream);
+
+        if (samples_written+samples_to_do > sample_count)
+            samples_to_do=sample_count-samples_written;
+
+        {
+            int i,j;
+            for (j=0;j<vgmstream->channels;j++) {
+                for (i=0;i<frame_size;i++) {
+                    sample_data[i] = read_8bit(vgmstream->ch[j].offset+
+                            i/vgmstream->interleave_block_size*
+                            vgmstream->interleave_block_size*
+                            vgmstream->channels+
+                            i%vgmstream->interleave_block_size,
+                            vgmstream->ch[j].streamfile);
+                }
+                decode_vgmstream_mem(vgmstream, samples_written,
+                        samples_to_do, buffer, sample_data, j);
+            }
+        }
+
+        samples_written += samples_to_do;
+        vgmstream->current_sample += samples_to_do;
+        vgmstream->samples_into_block+=samples_to_do;
+
+        if (vgmstream->samples_into_block==samples_this_block) {
+            int chan;
+            for (chan=0;chan<vgmstream->channels;chan++)
+                vgmstream->ch[chan].offset+=frame_size*vgmstream->channels;
+            vgmstream->samples_into_block=0;
+        }
+
+    }
+}