From 6b4f54df92f6544c189aff38597d37ca511f2dd8 Mon Sep 17 00:00:00 2001
From: bnnm <bananaman255@gmail.com>
Date: Wed, 22 Aug 2018 21:04:16 +0200
Subject: [PATCH] Add TXTH "loop_flag = auto" to autodetect PS-ADPCM loop
 points

---
 src/meta/txth.c | 20 ++++++++++++++++++--
 1 file changed, 18 insertions(+), 2 deletions(-)

diff --git a/src/meta/txth.c b/src/meta/txth.c
index c0bff483..b8b02d72 100644
--- a/src/meta/txth.c
+++ b/src/meta/txth.c
@@ -57,6 +57,7 @@ typedef struct {
 
     uint32_t loop_flag;
     int loop_flag_set;
+    int loop_flag_auto;
 
     uint32_t coef_offset;
     uint32_t coef_spacing;
@@ -132,6 +133,13 @@ VGMSTREAM * init_vgmstream_txth(STREAMFILE *streamFile) {
             goto fail;
     }
 
+    /* try to autodetect PS-ADPCM loop data */
+    if (txth.loop_flag_auto && coding == coding_PSX) {
+        size_t data_size = get_streamfile_size(streamFile) - txth.start_offset;
+        txth.loop_flag = ps_find_loop_offsets(streamFile, txth.start_offset, data_size, txth.channels, txth.interleave,
+                (int32_t*)&txth.loop_start_sample, (int32_t*)&txth.loop_end_sample);
+    }
+
 
     /* build the VGMSTREAM */
     vgmstream = allocate_vgmstream(txth.channels,txth.loop_flag);
@@ -583,8 +591,13 @@ static int parse_keyval(STREAMFILE * streamFile, STREAMFILE * streamText, txth_h
             txth->loop_adjust = get_bytes_to_samples(txth, txth->loop_adjust * (txth->interleave*txth->channels));
     }
     else if (0==strcmp(key,"loop_flag")) {
-        if (!parse_num(streamFile,val, &txth->loop_flag)) goto fail;
-        txth->loop_flag_set = 1;
+        if (0==strcmp(val,"auto"))  {
+            txth->loop_flag_auto = 1;
+        }
+        else {
+            if (!parse_num(streamFile,val, &txth->loop_flag)) goto fail;
+            txth->loop_flag_set = 1;
+        }
     }
     else if (0==strcmp(key,"coef_offset")) {
         if (!parse_num(streamFile,val, &txth->coef_offset)) goto fail;
@@ -602,6 +615,9 @@ static int parse_keyval(STREAMFILE * streamFile, STREAMFILE * streamText, txth_h
     else if (0==strcmp(key,"coef_mode")) {
         if (!parse_num(streamFile,val, &txth->coef_mode)) goto fail;
     }
+    else if (0==strcmp(key,"psx_loops")) {
+        if (!parse_num(streamFile,val, &txth->coef_mode)) goto fail;
+    }
     else {
         VGM_LOG("TXTH: unknown key=%s, val=%s\n", key,val);
         goto fail;