From c05ec2d0ab25fbcb873a69f961f174cb2d46b082 Mon Sep 17 00:00:00 2001
From: bnnm <bananaman255@gmail.com>
Date: Sat, 9 Apr 2022 15:15:43 +0200
Subject: [PATCH] Add .rsnd NSOpus [Birushana (Switch)]

---
 src/meta/meta.h |  1 +
 src/meta/opus.c | 29 +++++++++++++++++++++++++++++
 src/vgmstream.c |  1 +
 3 files changed, 31 insertions(+)

diff --git a/src/meta/meta.h b/src/meta/meta.h
index 231c9fce..3a70308e 100644
--- a/src/meta/meta.h
+++ b/src/meta/meta.h
@@ -655,6 +655,7 @@ VGMSTREAM* init_vgmstream_opus_prototype(STREAMFILE* sf);
 VGMSTREAM* init_vgmstream_opus_opusnx(STREAMFILE* sf);
 VGMSTREAM* init_vgmstream_opus_nsopus(STREAMFILE* sf);
 VGMSTREAM* init_vgmstream_opus_sqex(STREAMFILE* sf);
+VGMSTREAM* init_vgmstream_opus_rsnd(STREAMFILE* sf);
 
 VGMSTREAM * init_vgmstream_raw_al(STREAMFILE * streamFile);
 
diff --git a/src/meta/opus.c b/src/meta/opus.c
index d05af43e..95e14c37 100644
--- a/src/meta/opus.c
+++ b/src/meta/opus.c
@@ -511,3 +511,32 @@ VGMSTREAM* init_vgmstream_opus_sqex(STREAMFILE* sf) {
 fail:
     return NULL;
 }
+
+
+/* Idea Factory(?) variation [Birushana: Ichijuu no Kaze (Switch)] */
+VGMSTREAM* init_vgmstream_opus_rsnd(STREAMFILE* sf) {
+    off_t offset = 0;
+    int num_samples = 0, loop_start = 0, loop_end = 0, loop_flag;
+
+    /* checks */
+    if (!is_id32be(0x00, sf,"RSND"))
+        goto fail;
+    if (!check_extensions(sf, "rsnd"))
+        goto fail;
+    /* 0x04: 00? (16b)*/
+    /* 0x06: 00? (8b)*/
+    loop_flag = read_u8(0x07, sf);
+    if (loop_flag) { /* not really needed as both will be 0 */
+        loop_start = read_s32le(0x08, sf);
+        loop_end = read_s32le(0x0c, sf);
+    }
+    offset = read_u32le(0x10, sf); /* always 0x40 */
+    /* 0x14: offset again? */
+    /* 0x18+: null? (unknown numbers in bgm050) */
+    num_samples = 0; /* not loop_end as it isn't set when looping is disabled */
+
+
+    return init_vgmstream_opus(sf, meta_OPUS, offset, num_samples, loop_start, loop_end);
+fail:
+    return NULL;
+}
diff --git a/src/vgmstream.c b/src/vgmstream.c
index 174efc45..3e0b9b95 100644
--- a/src/vgmstream.c
+++ b/src/vgmstream.c
@@ -520,6 +520,7 @@ VGMSTREAM* (*init_vgmstream_functions[])(STREAMFILE* sf) = {
     init_vgmstream_dsp_apex,
     init_vgmstream_ubi_ckd_cwav,
     init_vgmstream_sspf,
+    init_vgmstream_opus_rsnd,
 
     /* lower priority metas (no clean header identity, somewhat ambiguous, or need extension/companion file to identify) */
     init_vgmstream_mpeg,