From 011aa6c6c134e7d643ff8a23c49c92449b429ca0 Mon Sep 17 00:00:00 2001
From: bnnm <bananaman255@gmail.com>
Date: Sat, 2 Oct 2021 18:15:04 +0200
Subject: [PATCH] Add LOPU .lopus [Melty Blood Type Lumina (Switch)]

---
 src/formats.c                    |  3 +-
 src/libvgmstream.vcxproj         |  1 +
 src/libvgmstream.vcxproj.filters |  3 ++
 src/meta/lopu.c                  | 61 ++++++++++++++++++++++++++++++++
 src/meta/meta.h                  |  2 ++
 src/vgmstream.c                  |  1 +
 src/vgmstream.h                  |  1 +
 7 files changed, 71 insertions(+), 1 deletion(-)
 create mode 100644 src/meta/lopu.c

diff --git a/src/formats.c b/src/formats.c
index 98a8c890..5b07351f 100644
--- a/src/formats.c
+++ b/src/formats.c
@@ -289,7 +289,7 @@ static const char* extension_list[] = {
     "lmp4", //fake extension for .mp4
     "lmpc", //fake extension for .mpc, FFmpeg/not parsed
     "logg", //fake extension for .ogg
-    "lopus", //fake extension for .opus
+    "lopus", //fake extension for .opus, used by LOPU too
     "lp",
     "lpcm",
     "lpk",
@@ -1364,6 +1364,7 @@ static const meta_info meta_info_list[] = {
         {meta_BNK_RELIC,            "Relic BNK header"},
         {meta_XSH_XSD_XSS,          "Treyarch XSH+XSD/XSS header"},
         {meta_PSB,                  "M2 PSB header"},
+        {meta_LOPU,                 "French-Break LOPU 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 a73676e8..f25dfba9 100644
--- a/src/libvgmstream.vcxproj
+++ b/src/libvgmstream.vcxproj
@@ -215,6 +215,7 @@
     <ClCompile Include="meta\ktsr.c" />
     <ClCompile Include="meta\ktss.c" />
     <ClCompile Include="meta\kwb.c" />
+    <ClCompile Include="meta\lopu.c" />
     <ClCompile Include="meta\lrmd.c" />
     <ClCompile Include="meta\lsf.c" />
     <ClCompile Include="meta\mattel_hyperscan.c" />
diff --git a/src/libvgmstream.vcxproj.filters b/src/libvgmstream.vcxproj.filters
index 43549e5b..884630f0 100644
--- a/src/libvgmstream.vcxproj.filters
+++ b/src/libvgmstream.vcxproj.filters
@@ -1903,6 +1903,9 @@
     <ClCompile Include="meta\kwb.c">
       <Filter>meta\Source Files</Filter>
     </ClCompile>
+    <ClCompile Include="meta\lopu.c">
+      <Filter>meta\Source Files</Filter>
+    </ClCompile>
     <ClCompile Include="meta\lrmd.c">
       <Filter>meta\Source Files</Filter>
     </ClCompile>
diff --git a/src/meta/lopu.c b/src/meta/lopu.c
new file mode 100644
index 00000000..9d896a3e
--- /dev/null
+++ b/src/meta/lopu.c
@@ -0,0 +1,61 @@
+#include "meta.h"
+#include "../coding/coding.h"
+
+
+/*  LOPU - French-Bread's Opus [Melty Blood: Type Lumina (Switch)] */
+VGMSTREAM* init_vgmstream_lopu(STREAMFILE* sf) {
+    VGMSTREAM* vgmstream = NULL;
+    int loop_flag, channels, sample_rate;
+    uint32_t start_offset, data_size;
+    int32_t num_samples, loop_start, loop_end, skip;
+
+    /* checks */
+    if (!is_id32be(0x00, sf, "LOPU"))
+        goto fail;
+
+    /* .lopus: real extension (honest) */
+    if (!check_extensions(sf, "lopus"))
+        goto fail;
+
+    start_offset    = read_u32le(0x04, sf);
+    sample_rate     = read_u32le(0x08, sf);
+    channels        = read_s16le(0x0c, sf);
+    /* 0x10: ? (1984) */
+    num_samples     = read_s32le(0x14, sf);
+    loop_start      = read_s32le(0x18, sf);
+    loop_end        = read_s32le(0x1c, sf) + 1;
+    /* 0x20: frame size */
+    skip            = read_s16le(0x24, sf);
+    data_size       = read_u32le(0x28, sf);
+    /* rest: null */
+
+    loop_flag = (loop_end > 0); /* -1 if no loop */
+    num_samples -= skip;
+
+
+    /* build the VGMSTREAM */
+    vgmstream = allocate_vgmstream(channels, loop_flag);
+    if (!vgmstream) goto fail;
+
+    vgmstream->meta_type = meta_LOPU;
+    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 32d354d9..5037602d 100644
--- a/src/meta/meta.h
+++ b/src/meta/meta.h
@@ -964,4 +964,6 @@ VGMSTREAM* init_vgmstream_xsh_xsd_xss(STREAMFILE* sf);
 
 VGMSTREAM* init_vgmstream_psb(STREAMFILE* sf);
 
+VGMSTREAM* init_vgmstream_lopu(STREAMFILE* sf);
+
 #endif /*_META_H*/
diff --git a/src/vgmstream.c b/src/vgmstream.c
index f05370cb..95bf6bd8 100644
--- a/src/vgmstream.c
+++ b/src/vgmstream.c
@@ -527,6 +527,7 @@ VGMSTREAM* (*init_vgmstream_functions[])(STREAMFILE* sf) = {
     init_vgmstream_bnk_relic,
     init_vgmstream_xsh_xsd_xss,
     init_vgmstream_psb,
+    init_vgmstream_lopu,
 
     /* lowest priority metas (should go after all metas, and TXTH should go before raw formats) */
     init_vgmstream_txth,            /* proper parsers should supersede TXTH, once added */
diff --git a/src/vgmstream.h b/src/vgmstream.h
index 8f536cbf..3aaf9e59 100644
--- a/src/vgmstream.h
+++ b/src/vgmstream.h
@@ -747,6 +747,7 @@ typedef enum {
     meta_BNK_RELIC,
     meta_XSH_XSD_XSS,
     meta_PSB,
+    meta_LOPU,
 
 } meta_t;