Added AGSC DSP header reading.

git-svn-id: https://vgmstream.svn.sourceforge.net/svnroot/vgmstream@24 51a99a44-fe44-0410-b1ba-c3e57ba2b86b

src/meta/agsc.c

@@ -0,0 +1,81 @@
+#include "agsc.h"
+#include "../util.h"
+
+/* .agsc - from Metroid Prime 2 */
+
+VGMSTREAM * init_vgmstream_agsc(const char * const filename) {
+    VGMSTREAM * vgmstream = NULL;
+    STREAMFILE * infile = NULL;
+
+    coding_t coding_type;
+
+    off_t header_offset;
+    off_t start_offset;
+    int channel_count;
+    int i;
+
+    /* check extension, case insensitive */
+    if (strcasecmp("agsc",filename_extension(filename))) goto fail;
+
+    /* try to open the file for header reading */
+    infile = open_streamfile(filename);
+    if (!infile) goto fail;
+
+    /* check header */
+    if ((uint32_t)read_32bitBE(0,infile)!=0x00000001)
+        goto fail;
+
+    /* count length of name, including terminating 0 */
+    for (header_offset=4;header_offset < get_streamfile_size(infile) && read_8bit(header_offset,infile)!='\0';header_offset++);
+
+    header_offset ++;
+
+    channel_count = 1;
+
+    /* build the VGMSTREAM */
+
+    vgmstream = allocate_vgmstream(1,1);
+    if (!vgmstream) goto fail;
+
+    /* fill in the vital statistics */
+    vgmstream->num_samples = read_32bitBE(header_offset+0xda,infile);
+    vgmstream->sample_rate = read_16bitBE(header_offset+0xd8,infile);
+
+    vgmstream->loop_start_sample = read_32bitBE(header_offset+0xde,infile);
+    /* this is cute, we actually have a "loop length" */
+    vgmstream->loop_end_sample = (vgmstream->loop_start_sample + read_32bitBE(header_offset+0xe2,infile))-1;
+
+    vgmstream->coding_type = coding_NGC_DSP;
+    vgmstream->layout_type = layout_none;
+    vgmstream->meta_type = meta_DSP_AGSC;
+
+    for (i=0;i<16;i++) {
+        vgmstream->ch[0].adpcm_coef[i]=read_16bitBE(header_offset+0xf6+i*2,infile);
+    }
+
+    start_offset = header_offset+0x116;
+
+    close_streamfile(infile); infile=NULL;
+
+    /* open the file for reading by each channel */
+    {
+        int i;
+        for (i=0;i<channel_count;i++) {
+            vgmstream->ch[i].streamfile = open_streamfile(filename);
+
+            if (!vgmstream->ch[i].streamfile) goto fail;
+
+            vgmstream->ch[i].channel_start_offset=
+                vgmstream->ch[i].offset=
+                start_offset;
+        }
+    }
+
+    return vgmstream;
+
+    /* clean up anything we may have opened */
+fail:
+    if (infile) close_streamfile(infile);
+    if (vgmstream) close_vgmstream(vgmstream);
+    return NULL;
+}

src/meta/agsc.h

@@ -0,0 +1,8 @@
+#include "../vgmstream.h"
+
+#ifndef _AGSC_H
+#define _AGSC_H
+
+VGMSTREAM * init_vgmstream_agsc(const char * const filename);
+
+#endif

src/vgmstream.c

@@ -2,6 +2,7 @@
 #include "meta/adx_header.h"
 #include "meta/brstm.h"
 #include "meta/nds_strm.h"
+#include "meta/agsc.h"
 #include "layout/interleave.h"
 #include "layout/nolayout.h"
 #include "coding/adx_decoder.h"
@@ -12,11 +13,12 @@
  * List of functions that will recognize files. These should correspond pretty
  * directly to the metadata types
  */
-#define INIT_VGMSTREAM_FCNS 3
+#define INIT_VGMSTREAM_FCNS 4
 VGMSTREAM * (*init_vgmstream_fcns[INIT_VGMSTREAM_FCNS])(const char * const) = {
     init_vgmstream_adx,
     init_vgmstream_brstm,
     init_vgmstream_nds_strm,
+    init_vgmstream_agsc,
 };
 
 /* format detection and VGMSTREAM setup */
@@ -255,6 +257,13 @@ int vgmstream_do_loop(VGMSTREAM * vgmstream) {
 /*    if (vgmstream->loop_flag) {*/
         /* is this the loop end? */
         if (vgmstream->current_sample==vgmstream->loop_end_sample) {
+            int i;
+            /*
+            for (i=0;i<vgmstream->channels;i++) {
+                vgmstream->loop_ch[i].adpcm_history1_32 = vgmstream->ch[i].adpcm_history1_32;
+                vgmstream->loop_ch[i].adpcm_history2_32 = vgmstream->ch[i].adpcm_history2_32;
+            }
+            */
             /* restore! */
             memcpy(vgmstream->ch,vgmstream->loop_ch,sizeof(VGMSTREAMCHANNEL)*vgmstream->channels);
             vgmstream->current_sample=vgmstream->loop_sample;
@@ -304,6 +313,9 @@ void describe_vgmstream(VGMSTREAM * vgmstream) {
         case meta_ADX_04:
             printf("ADX header type 04");
             break;
+        case meta_DSP_AGSC:
+            printf("AGSC header");
+            break;
         default:
             printf("THEY SHOULD HAVE SENT A POET");
     }

src/vgmstream.h

@@ -50,6 +50,7 @@ typedef enum {
     meta_DSP_RS03,          /* Metroid Prime 2 "RS03" */
     meta_DSP_STM,           /* Paper Mario 2 STM */
     meta_DSP_HALP,          /* SSB:M "HALPST" */
+    meta_DSP_AGSC,
     /* Nintendo */
     meta_AST,               /* AST */
     meta_STRM,              /* STRM */