From 1d982bef6f1a4fbe09bfa7dcc90e939adc827108 Mon Sep 17 00:00:00 2001
From: Adrian Graber <adrian@adriangraber.com>
Date: Wed, 27 Sep 2023 14:50:21 +0200
Subject: [PATCH] Add support for FDK (NX) Opus Header

---
 doc/FORMATS.md                   |  4 +++
 src/formats.c                    |  2 ++
 src/libvgmstream.vcxproj         |  1 +
 src/libvgmstream.vcxproj.filters |  3 ++
 src/meta/fdk_nxopus.c            | 52 ++++++++++++++++++++++++++++++++
 src/meta/meta.h                  |  1 +
 src/vgmstream.c                  |  1 +
 src/vgmstream_types.h            |  1 +
 8 files changed, 65 insertions(+)
 create mode 100644 src/meta/fdk_nxopus.c

diff --git a/doc/FORMATS.md b/doc/FORMATS.md
index 369b6b87..aa4e26ad 100644
--- a/doc/FORMATS.md
+++ b/doc/FORMATS.md
@@ -1124,6 +1124,10 @@ different internally (encrypted, different versions, etc) and not always can be
   - Entergram NXA header [*NXA*]
   - *opus_nxa*: `.nxa`
   - Codecs: Opus
+- **fdk_nxopus.c**
+  - Nihon Falcom FDK Opus Header [*FDK_NXOPUS*]
+  - *opus_fdk*: `.nxopus`
+  - Codecs: Opus
 - **pc_ast.c**
   - Capcom AST (PC) header [*PC_AST*]
   - *pc_ast*: `.ast`
diff --git a/src/formats.c b/src/formats.c
index 93afc56f..faeb5a3a 100644
--- a/src/formats.c
+++ b/src/formats.c
@@ -392,6 +392,7 @@ static const char* extension_list[] = {
     "nwa",
     "nwav",
     "nxa",
+    "nxopus",
 
     //"ogg", //common
     "ogg_",
@@ -1416,6 +1417,7 @@ static const meta_info meta_info_list[] = {
         {meta_SQUEAKSTREAM,         "Torus SqueakStream header"},
         {meta_SQUEAKSAMPLE,         "Torus SqueakSample header"},
         {meta_SNDS,                 "Sony SNDS header"},
+        {meta_FDK_NXOPUS,           "Nihon Falcom FDK Opus Header"},
 };
 
 void get_vgmstream_coding_description(VGMSTREAM* vgmstream, char* out, size_t out_size) {
diff --git a/src/libvgmstream.vcxproj b/src/libvgmstream.vcxproj
index 99a85c6a..c123a0d1 100644
--- a/src/libvgmstream.vcxproj
+++ b/src/libvgmstream.vcxproj
@@ -425,6 +425,7 @@
     <ClCompile Include="meta\ezw.c" />
     <ClCompile Include="meta\fag.c" />
     <ClCompile Include="meta\fda.c" />
+    <ClCompile Include="meta\fdk_nxopus.c" />
     <ClCompile Include="meta\ffdl.c" />
     <ClCompile Include="meta\ffmpeg.c" />
     <ClCompile Include="meta\ffw.c" />
diff --git a/src/libvgmstream.vcxproj.filters b/src/libvgmstream.vcxproj.filters
index bb2f940c..2067c5e4 100644
--- a/src/libvgmstream.vcxproj.filters
+++ b/src/libvgmstream.vcxproj.filters
@@ -1096,6 +1096,9 @@
     <ClCompile Include="meta\fda.c">
       <Filter>meta\Source Files</Filter>
     </ClCompile>
+    <ClCompile Include="meta\fdk_nxopus.c">
+      <Filter>meta\Source Files</Filter>
+    </ClCompile>
     <ClCompile Include="meta\ffdl.c">
       <Filter>meta\Source Files</Filter>
     </ClCompile>
diff --git a/src/meta/fdk_nxopus.c b/src/meta/fdk_nxopus.c
new file mode 100644
index 00000000..5d7725e0
--- /dev/null
+++ b/src/meta/fdk_nxopus.c
@@ -0,0 +1,52 @@
+#include "meta.h"
+#include "../coding/coding.h"
+
+/* Nihon Falcom FDK NXOpus  [Ys X -NORDICS- (Switch)] */
+VGMSTREAM* init_vgmstream_opus_fdk(STREAMFILE* sf) {
+    VGMSTREAM* vgmstream = NULL;
+    off_t start_offset;
+    int loop_flag, channels, sample_rate;
+    size_t data_size, skip = 0;
+    int32_t num_samples, loop_start, loop_end;
+
+    /* checks */
+    if (!is_id32le(0x00, sf, "nxof"))
+        goto fail;
+    if (!check_extensions(sf,"nxopus"))
+        goto fail;
+
+    channels        = read_u8(0x05, sf);
+    sample_rate     = read_u32le(0x08, sf);
+    start_offset    = read_u32le(0x18, sf);
+    data_size       = read_u32le(0x1C, sf);
+    num_samples     = read_u32le(0x20, sf);
+    loop_start      = read_u32le(0x30, sf);
+    loop_end        = read_u32le(0x34, sf);
+
+    loop_flag = (loop_end > 0);
+
+    vgmstream = allocate_vgmstream(channels, loop_flag);
+    if (!vgmstream) goto fail;
+
+    vgmstream->meta_type = meta_FDK_NXOPUS;
+    vgmstream->sample_rate = sample_rate;
+    vgmstream->num_samples = num_samples;
+    vgmstream->loop_start_sample = loop_start;
+    vgmstream->loop_end_sample = loop_end;
+
+#ifdef VGM_USE_FFMPEG
+    vgmstream->codec_data = init_ffmpeg_switch_opus(sf, start_offset, data_size, vgmstream->channels, skip, vgmstream->sample_rate);
+    if (!vgmstream->codec_data) goto fail;
+    vgmstream->coding_type = coding_FFmpeg;
+    vgmstream->layout_type = layout_none;
+#else
+    goto fail;
+#endif
+
+    if (!vgmstream_open_stream(vgmstream, sf, start_offset))
+        goto fail;
+    return vgmstream;
+fail:
+    close_vgmstream(vgmstream);
+    return NULL;
+}
diff --git a/src/meta/meta.h b/src/meta/meta.h
index f11b389c..8fbeafa8 100644
--- a/src/meta/meta.h
+++ b/src/meta/meta.h
@@ -625,6 +625,7 @@ 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_opus_fdk(STREAMFILE* sf);
 
 VGMSTREAM * init_vgmstream_pc_ast(STREAMFILE * streamFile);
 
diff --git a/src/vgmstream.c b/src/vgmstream.c
index 1dcf641c..a85595fb 100644
--- a/src/vgmstream.c
+++ b/src/vgmstream.c
@@ -309,6 +309,7 @@ init_vgmstream_t init_vgmstream_functions[] = {
     init_vgmstream_opus_nus3,
     init_vgmstream_opus_sps_n1,
     init_vgmstream_opus_nxa,
+    init_vgmstream_opus_fdk,
     init_vgmstream_pc_ast,
     init_vgmstream_naac,
     init_vgmstream_ubi_sb,
diff --git a/src/vgmstream_types.h b/src/vgmstream_types.h
index 15217c33..2b0383ee 100644
--- a/src/vgmstream_types.h
+++ b/src/vgmstream_types.h
@@ -702,6 +702,7 @@ typedef enum {
     meta_SQUEAKSTREAM,
     meta_SQUEAKSAMPLE,
     meta_SNDS,
+    meta_FDK_NXOPUS,
 
 } meta_t;