From fcc728c8b15ec88be82fc169f7af3a0310b6ae8e Mon Sep 17 00:00:00 2001
From: bxaimc <bxaimc@yahoo.com>
Date: Wed, 1 Aug 2018 01:24:26 -0400
Subject: [PATCH] Add Entergram NXA Opus

---
 src/formats.c   |  1 +
 src/meta/meta.h |  1 +
 src/meta/opus.c | 72 +++++++++++++++++++++++++++++++++++++++++++++++++
 src/vgmstream.c |  1 +
 4 files changed, 75 insertions(+)

diff --git a/src/formats.c b/src/formats.c
index 75dfc06e..8ca57a37 100644
--- a/src/formats.c
+++ b/src/formats.c
@@ -244,6 +244,7 @@ static const char* extension_list[] = {
     "npsf", //fake extension/header id for .nps (to be removed)
     "nus3bank",
     "nwa",
+    "nxa",
 
     //"ogg", //common
     "ogl",
diff --git a/src/meta/meta.h b/src/meta/meta.h
index 3fc10128..b7863854 100644
--- a/src/meta/meta.h
+++ b/src/meta/meta.h
@@ -679,6 +679,7 @@ VGMSTREAM * init_vgmstream_opus_nop(STREAMFILE * streamFile);
 VGMSTREAM * init_vgmstream_opus_shinen(STREAMFILE * streamFile);
 VGMSTREAM * init_vgmstream_opus_nus3(STREAMFILE * streamFile);
 VGMSTREAM * init_vgmstream_opus_nlsd(STREAMFILE * streamFile);
+VGMSTREAM * init_vgmstream_opus_nxa(STREAMFILE * streamFile);
 
 VGMSTREAM * init_vgmstream_pc_al2(STREAMFILE * streamFile);
 
diff --git a/src/meta/opus.c b/src/meta/opus.c
index 5d010bfd..75e69290 100644
--- a/src/meta/opus.c
+++ b/src/meta/opus.c
@@ -332,3 +332,75 @@ VGMSTREAM * init_vgmstream_opus_nlsd(STREAMFILE *streamFile) {
 fail:
     return NULL;
 }
+
+/* Entergram NXA Opus [Higurashi no Naku Koro ni Hou (Switch)] */
+VGMSTREAM * init_vgmstream_opus_nxa(STREAMFILE *streamFile) {
+    VGMSTREAM * vgmstream = NULL;
+    off_t start_offset;
+    int loop_flag = 0, channel_count;
+    size_t data_size, skip = 0;
+
+    /* checks */
+    if (!check_extensions(streamFile, "nxa"))
+        goto fail;
+    if (read_32bitBE(0x00, streamFile) != 0x4E584131) /* "NXA1" */
+        goto fail;
+
+    channel_count = read_16bitLE(0x10, streamFile);
+    skip = read_16bitLE(0x16, streamFile);
+    data_size = read_32bitLE(0x08, streamFile)-0x30;
+    start_offset = 0x30;
+
+    /* TODO: Determine if loop points are stored externally. No visible loop points in header */
+    loop_flag = 0;
+
+
+    /* build the VGMSTREAM */
+    vgmstream = allocate_vgmstream(channel_count, loop_flag);
+    if (!vgmstream) goto fail;
+
+    vgmstream->num_samples = read_32bitLE(0x20, streamFile);
+    vgmstream->sample_rate = read_32bitLE(0x0C, streamFile);
+    vgmstream->meta_type = meta_OPUS;
+
+#ifdef VGM_USE_FFMPEG
+    {
+        uint8_t buf[0x100];
+        size_t bytes;
+        ffmpeg_custom_config cfg = { 0 };
+        ffmpeg_codec_data *ffmpeg_data;
+
+        bytes = ffmpeg_make_opus_header(buf, 0x100, vgmstream->channels, skip, vgmstream->sample_rate);
+        if (bytes <= 0) goto fail;
+
+        cfg.type = FFMPEG_SWITCH_OPUS;
+
+        ffmpeg_data = init_ffmpeg_config(streamFile, buf, bytes, start_offset, data_size, &cfg);
+        if (!ffmpeg_data) goto fail;
+
+        vgmstream->codec_data = ffmpeg_data;
+        vgmstream->coding_type = coding_FFmpeg;
+        vgmstream->layout_type = layout_none;
+
+        if (ffmpeg_data->skipSamples <= 0) {
+            ffmpeg_set_skip_samples(ffmpeg_data, skip);
+        }
+
+        if (vgmstream->num_samples == 0) {
+            vgmstream->num_samples = switch_opus_get_samples(start_offset, data_size,
+            vgmstream->sample_rate, streamFile) - skip;
+        }
+    }
+#else
+    goto fail;
+#endif
+
+    /* open the file for reading */
+    if (!vgmstream_open_stream(vgmstream, streamFile, start_offset))
+        goto fail;
+    return vgmstream;
+
+fail:
+    close_vgmstream(vgmstream);
+    return NULL;
+}
diff --git a/src/vgmstream.c b/src/vgmstream.c
index 357466c0..a1867898 100644
--- a/src/vgmstream.c
+++ b/src/vgmstream.c
@@ -373,6 +373,7 @@ VGMSTREAM * (*init_vgmstream_functions[])(STREAMFILE *streamFile) = {
     init_vgmstream_opus_shinen,
     init_vgmstream_opus_nus3,
     init_vgmstream_opus_nlsd,
+    init_vgmstream_opus_nxa,
     init_vgmstream_pc_al2,
     init_vgmstream_pc_ast,
     init_vgmstream_naac,