1 files changed, 117 insertions, 0 deletions
diff --git a/lib/vgmstream/src/meta/psx_cdxa.c b/lib/vgmstream/src/meta/psx_cdxa.c
new file mode 100644
index 0000000000..24b274f6ae
--- /dev/null
+++ b/lib/vgmstream/src/meta/psx_cdxa.c
@@ -0,0 +1,117 @@
+#include "meta.h"
+#include "../layout/layout.h"
+#include "../util.h"
+
+/* Sony PSX CD-XA */
+/* No looped file ! */
+
+off_t init_xa_channel(int channel,STREAMFILE *streamFile);
+
+uint8_t AUDIO_CODING_GET_STEREO(uint8_t value) {
+	return (uint8_t)(value & 3);
+}
+
+uint8_t AUDIO_CODING_GET_FREQ(uint8_t value) {
+	return (uint8_t)((value >> 2) & 3);
+}
+
+VGMSTREAM * init_vgmstream_cdxa(STREAMFILE *streamFile) {
+    VGMSTREAM * vgmstream = NULL;
+    char filename[260];
+
+	int channel_count;
+	uint8_t bCoding;
+	off_t start_offset;
+
+    int i;
+
+    /* check extension, case insensitive */
+    streamFile->get_name(streamFile,filename,sizeof(filename));
+    if (strcasecmp("xa",filename_extension(filename))) goto fail;
+
+    /* check RIFF Header */
+    if (!((read_32bitBE(0x00,streamFile) == 0x52494646) && 
+	      (read_32bitBE(0x08,streamFile) == 0x43445841) && 
+		  (read_32bitBE(0x0C,streamFile) == 0x666D7420)))
+        goto fail;
+
+	/* First init to have the correct info of the channel */
+	start_offset=init_xa_channel(0,streamFile);
+
+	/* No sound ? */
+	if(start_offset==0)
+		goto fail;
+
+	bCoding = read_8bit(start_offset-5,streamFile);
+
+	switch (AUDIO_CODING_GET_STEREO(bCoding)) {
+		case 0: channel_count = 1; break;
+		case 1: channel_count = 2; break;
+		default: channel_count = 0; break;
+	}
+
+	/* build the VGMSTREAM */
+    vgmstream = allocate_vgmstream(channel_count,0);
+    if (!vgmstream) goto fail;
+
+	/* fill in the vital statistics */
+	vgmstream->channels = channel_count;
+	vgmstream->xa_channel = 0;
+
+	switch (AUDIO_CODING_GET_FREQ(bCoding)) {
+		case 0: vgmstream->sample_rate = 37800; break;
+		case 1: vgmstream->sample_rate = 18900; break;
+		default: vgmstream->sample_rate = 0; break;
+	}
+
+	/* Check for Compression Scheme */
+	vgmstream->coding_type = coding_XA;
+    vgmstream->num_samples = (int32_t)((((get_streamfile_size(streamFile) - 0x3C)/2352)*0x1F80)/(2*channel_count));
+
+    vgmstream->layout_type = layout_xa_blocked;
+    vgmstream->meta_type = meta_PSX_XA;
+
+	/* open the file for reading by each channel */
+    {
+        STREAMFILE *chstreamfile;
+        chstreamfile = streamFile->open(streamFile,filename,2352);
+
+        if (!chstreamfile) goto fail;
+
+        for (i=0;i<channel_count;i++) {
+            vgmstream->ch[i].streamfile = chstreamfile;
+        }
+    }
+	
+	xa_block_update(start_offset,vgmstream);
+
+	return vgmstream;
+
+    /* clean up anything we may have opened */
+fail:
+    if (vgmstream) close_vgmstream(vgmstream);
+    return NULL;
+}
+
+off_t init_xa_channel(int channel,STREAMFILE* streamFile) {
+	
+	off_t block_offset=0x44;
+	size_t filelength=get_streamfile_size(streamFile);
+
+	int8_t currentChannel;
+	int8_t subAudio;
+
+begin:
+
+	// 0 can't be a correct value
+	if(block_offset>=(off_t)filelength)
+		return 0;
+
+	currentChannel=read_8bit(block_offset-7,streamFile);
+	subAudio=read_8bit(block_offset-6,streamFile);
+	if (!((currentChannel==channel) && (subAudio==0x64))) {
+		block_offset+=2352;
+		goto begin;
+	}
+	return block_offset;
+}