From d2925316548cc95fa86873f7b88db2c5487cf31b Mon Sep 17 00:00:00 2001
From: bnnm <bananaman255@gmail.com>
Date: Sun, 29 Apr 2018 21:04:55 +0200
Subject: [PATCH] Add switch_audio [Gal Gun 2 (Switch)]

---
 src/formats.c          |  4 +++-
 src/meta/meta.h        |  1 +
 src/meta/ngc_dsp_std.c | 28 ++++++++++++++++++++++++++++
 src/vgmstream.c        |  1 +
 src/vgmstream.h        |  1 +
 5 files changed, 34 insertions(+), 1 deletion(-)

diff --git a/src/formats.c b/src/formats.c
index 16e8ec66..647ccc51 100644
--- a/src/formats.c
+++ b/src/formats.c
@@ -338,6 +338,7 @@ static const char* extension_list[] = {
     "swag",
     "swav",
     "swd",
+    "switch_audio"
     "sx",
     "sxd",
     "sxd2",
@@ -487,7 +488,7 @@ static const coding_info coding_info_list[] = {
         {coding_PSX,                "Playstation 4-bit ADPCM"},
         {coding_PSX_badflags,       "Playstation 4-bit ADPCM (bad flags)"},
         {coding_PSX_cfg,            "Playstation 4-bit ADPCM (configurable)"},
-        {coding_HEVAG,              "Playstation Vita HEVAG 4-bit ADPCM"},
+        {coding_HEVAG,              "Sony HEVAG 4-bit ADPCM"},
 
         {coding_EA_XA,              "Electronic Arts EA-XA 4-bit ADPCM v1"},
         {coding_EA_XA_int,          "Electronic Arts EA-XA 4-bit ADPCM v1 (mono/interleave)"},
@@ -1009,6 +1010,7 @@ static const meta_info meta_info_list[] = {
         {meta_PPST,                 "Parappa PPST header"},
         {meta_OPUS_PPP,             "AT9 OPUS header"},
         {meta_UBI_BAO,              "Ubisoft BAO header"},
+        {meta_DSP_SWITCH_AUDIO,     "UE4 Switch Audio header"},
 
 #ifdef VGM_USE_FFMPEG
         {meta_FFmpeg,               "FFmpeg supported file format"},
diff --git a/src/meta/meta.h b/src/meta/meta.h
index eb0c4545..c32d4715 100644
--- a/src/meta/meta.h
+++ b/src/meta/meta.h
@@ -749,4 +749,5 @@ VGMSTREAM * init_vgmstream_opus_ppp(STREAMFILE *streamFile);
 
 VGMSTREAM * init_vgmstream_ubi_bao_pk(STREAMFILE *streamFile);
 
+VGMSTREAM * init_vgmstream_dsp_switch_audio(STREAMFILE *streamFile);
 #endif /*_META_H*/
diff --git a/src/meta/ngc_dsp_std.c b/src/meta/ngc_dsp_std.c
index 6476191f..990a1c21 100644
--- a/src/meta/ngc_dsp_std.c
+++ b/src/meta/ngc_dsp_std.c
@@ -1340,3 +1340,31 @@ VGMSTREAM * init_vgmstream_dsp_mcadpcm(STREAMFILE *streamFile) {
 fail:
     return NULL;
 }
+
+/* .switch_audio - UE4 standard LE header + full interleaved dsp [Gal Gun 2 (Switch)] */
+VGMSTREAM * init_vgmstream_dsp_switch_audio(STREAMFILE *streamFile) {
+    dsp_meta dspm = {0};
+
+    /* checks */
+    /* .switch_audio: possibly UE4 class name rather than extension, .dsp: assumed */
+    if (!check_extensions(streamFile, "switch_audio,dsp"))
+        goto fail;
+
+    /* manual double header test */
+    if (read_32bitLE(0x00, streamFile) == read_32bitLE(get_streamfile_size(streamFile) / 2, streamFile))
+        dspm.channel_count = 2;
+    else
+        dspm.channel_count = 1;
+    dspm.max_channels = 2;
+    dspm.little_endian = 1;
+
+    dspm.header_offset = 0x00;
+    dspm.header_spacing = get_streamfile_size(streamFile) / dspm.channel_count;
+    dspm.start_offset = dspm.header_offset + 0x60;
+    dspm.interleave = dspm.header_spacing;
+
+    dspm.meta_type = meta_DSP_SWITCH_AUDIO;
+    return init_vgmstream_dsp_common(streamFile, &dspm);
+fail:
+    return NULL;
+}
diff --git a/src/vgmstream.c b/src/vgmstream.c
index 9a0926bf..832b36b1 100644
--- a/src/vgmstream.c
+++ b/src/vgmstream.c
@@ -406,6 +406,7 @@ VGMSTREAM * (*init_vgmstream_functions[])(STREAMFILE *streamFile) = {
     init_vgmstream_ppst,
     init_vgmstream_opus_ppp,
     init_vgmstream_ubi_bao_pk,
+    init_vgmstream_dsp_switch_audio,
 
     init_vgmstream_txth,  /* should go at the end (lower priority) */
 #ifdef VGM_USE_FFMPEG
diff --git a/src/vgmstream.h b/src/vgmstream.h
index 1c7a7ca7..229174fc 100644
--- a/src/vgmstream.h
+++ b/src/vgmstream.h
@@ -674,6 +674,7 @@ typedef enum {
     meta_PPST,              /* PPST [Parappa the Rapper (PSP)] */
     meta_OPUS_PPP,          /* .at9 Opus [Penny-Punching Princess (Switch)] */
     meta_UBI_BAO,           /* Ubisoft BAO */
+    meta_DSP_SWITCH_AUDIO,  /* Gal Gun 2 (Switch) */
 
 #ifdef VGM_USE_FFMPEG
     meta_FFmpeg,