From dbc351227669587a1773a7259374dd39dced11ed Mon Sep 17 00:00:00 2001
From: halleyscometsw <halleyscometsw@51a99a44-fe44-0410-b1ba-c3e57ba2b86b>
Date: Wed, 30 Jul 2008 20:58:50 +0000
Subject: [PATCH] adding 8-bit pcm with sign bit (and interleave) support

git-svn-id: https://vgmstream.svn.sourceforge.net/svnroot/vgmstream@377 51a99a44-fe44-0410-b1ba-c3e57ba2b86b
---
 src/coding/coding.h      |  1 +
 src/coding/pcm_decoder.c | 11 +++++++++++
 src/vgmstream.c          | 12 ++++++++++++
 src/vgmstream.h          |  2 ++
 4 files changed, 26 insertions(+)

diff --git a/src/coding/coding.h b/src/coding/coding.h
index b5f1a958..8b6bdce9 100644
--- a/src/coding/coding.h
+++ b/src/coding/coding.h
@@ -29,6 +29,7 @@ void decode_pcm16LE_int(VGMSTREAMCHANNEL * stream, sample * outbuf, int channels
 void decode_pcm16BE(VGMSTREAMCHANNEL * stream, sample * outbuf, int channelspacing, int32_t first_sample, int32_t samples_to_do);
 void decode_pcm8(VGMSTREAMCHANNEL * stream, sample * outbuf, int channelspacing, int32_t first_sample, int32_t samples_to_do);
 void decode_pcm8_int(VGMSTREAMCHANNEL * stream, sample * outbuf, int channelspacing, int32_t first_sample, int32_t samples_to_do);
+void decode_pcm8_sb_int(VGMSTREAMCHANNEL * stream, sample * outbuf, int channelspacing, int32_t first_sample, int32_t samples_to_do);
 
 void decode_psx(VGMSTREAMCHANNEL * stream, sample * outbuf, int channelspacing, int32_t first_sample, int32_t samples_to_do);
 
diff --git a/src/coding/pcm_decoder.c b/src/coding/pcm_decoder.c
index f9a414de..06d4912b 100644
--- a/src/coding/pcm_decoder.c
+++ b/src/coding/pcm_decoder.c
@@ -37,6 +37,17 @@ void decode_pcm8_int(VGMSTREAMCHANNEL * stream, sample * outbuf, int channelspac
     }
 }
 
+void decode_pcm8_sb_int(VGMSTREAMCHANNEL * stream, sample * outbuf, int channelspacing, int32_t first_sample, int32_t samples_to_do) {
+    int i;
+    int32_t sample_count;
+
+    for (i=first_sample,sample_count=0; i<first_sample+samples_to_do; i++,sample_count+=channelspacing) {
+        int16_t v = (uint8_t)read_8bit(stream->offset+i*channelspacing,stream->streamfile);
+        if (v&0x80) v = 0-(v&0x7f);
+        outbuf[sample_count] = v*0x100;
+    }
+}
+
 void decode_pcm16LE_int(VGMSTREAMCHANNEL * stream, sample * outbuf, int channelspacing, int32_t first_sample, int32_t samples_to_do) {
     int i;
     int32_t sample_count;
diff --git a/src/vgmstream.c b/src/vgmstream.c
index 012dfebc..f6dcc3df 100644
--- a/src/vgmstream.c
+++ b/src/vgmstream.c
@@ -405,6 +405,7 @@ int get_vgmstream_samples_per_frame(VGMSTREAM * vgmstream) {
         case coding_PCM16BE:
         case coding_PCM8:
 		case coding_PCM8_int:
+        case coding_PCM8_SB_int:
 #ifdef VGM_USE_VORBIS
         case coding_ogg_vorbis:
 #endif
@@ -478,6 +479,7 @@ int get_vgmstream_frame_size(VGMSTREAM * vgmstream) {
             return 2;
         case coding_PCM8:
 		case coding_PCM8_int:
+        case coding_PCM8_SB_int:
         case coding_SDX2:
         case coding_SDX2_int:
             return 1;
@@ -591,6 +593,13 @@ void decode_vgmstream(VGMSTREAM * vgmstream, int samples_written, int samples_to
                         samples_to_do);
             }
             break;
+        case coding_PCM8_SB_int:
+            for (chan=0;chan<vgmstream->channels;chan++) {
+                decode_pcm8_sb_int(&vgmstream->ch[chan],buffer+samples_written*vgmstream->channels+chan,
+                        vgmstream->channels,vgmstream->samples_into_block,
+                        samples_to_do);
+            }
+            break;
         case coding_NDS_IMA:
             for (chan=0;chan<vgmstream->channels;chan++) {
                 decode_nds_ima(&vgmstream->ch[chan],buffer+samples_written*vgmstream->channels+chan,
@@ -912,6 +921,9 @@ void describe_vgmstream(VGMSTREAM * vgmstream, char * desc, int length) {
         case coding_PCM8_int:
             snprintf(temp,TEMPSIZE,"8-bit PCM with 1 byte interleave");
             break;
+        case coding_PCM8_SB_int:
+            snprintf(temp,TEMPSIZE,"8-bit PCM with sign bit, 1 byte interleave");
+            break;
         case coding_NGC_DSP:
             snprintf(temp,TEMPSIZE,"Gamecube \"DSP\" 4-bit ADPCM");
             break;
diff --git a/src/vgmstream.h b/src/vgmstream.h
index b25b0691..e73ae7bc 100644
--- a/src/vgmstream.h
+++ b/src/vgmstream.h
@@ -34,6 +34,8 @@ typedef enum {
     coding_PCM8,            /* 8-bit PCM */
 	coding_PCM8_int,		/* 8-Bit PCM with sample-level interleave handled
                                by the decoder */
+    coding_PCM8_SB_int,     /* 8-bit PCM, sign bit (others are 2's complement),
+                               sample-level interleave */
 
     /* 4-bit ADPCM */
     coding_NDS_IMA,         /* IMA ADPCM w/ NDS layout */