rename and build as C

neotools/neoadpcmextract.c

@@ -0,0 +1,97 @@
+/* neoadpcmextract.cpp
+  Copyright (C) 2017, 2019 Nicholas Curtis
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+
+
+typedef struct { uint8_t* data; size_t size; } Buffer;
+
+void DecodeSample(FILE* fin, const char* name, Buffer* buf)
+{
+	// Get sample data length.
+	uint32_t sampLen = 0;
+	fread(&sampLen, sizeof(uint32_t), 1, fin);
+	if (sampLen < sizeof(uint64_t))
+		return;
+	sampLen -= sizeof(uint64_t);
+
+	// Resize buffer if needed.
+	if (!buf->data || buf->size < sampLen)
+	{
+		free(buf->data);
+		buf->data = (uint8_t*)malloc(sampLen);
+		buf->size = sampLen;
+	}
+
+	// Ignore 8 bytes.
+	uint64_t dummy;
+	fread(&dummy, sizeof(uint64_t), 1, fin);
+
+	// Read adpcm data.
+	fread(buf->data, sizeof(uint8_t), sampLen, fin);
+
+	FILE* fout = fopen(name, "wb");
+	if (!fout)
+		return;
+
+	fwrite(buf->data, sizeof(uint8_t), sampLen, fout);
+	fclose(fout);
+}
+
+int main(int argc, char** argv)
+{
+	if (argc != 2)
+		return 1;
+
+	// Open file.
+	FILE* file = fopen(argv[1], "rb");
+	if (!file)
+		return 1;
+
+	// Search for pcm headers.
+	Buffer smpBytes = {NULL, 0};
+	char namebuf[32];
+	int smpaCount = 0, smpbCount = 0;
+	while (!feof(file) && !ferror(file))
+	{
+		if (fgetc(file) != 0x67 || fgetc(file) != 0x66)
+			continue;
+
+		uint8_t byte = fgetc(file);
+		if (byte == 0x82)
+		{
+			printf("ADPCM-A data found at 0x%08lX\n", ftell(file));
+			snprintf(namebuf, sizeof(namebuf), "smpa_%x.pcm", smpaCount++);
+			DecodeSample(file, namebuf, &smpBytes);
+		}
+		else if (byte == 0x83)
+		{
+			printf("ADPCM-B data found at 0x%08lX\n", ftell(file));
+			snprintf(namebuf, sizeof(namebuf), "smpb_%x.pcm", smpbCount++);
+			DecodeSample(file, namebuf, &smpBytes);
+		}
+	}
+
+	free(smpBytes.data);
+	fclose(file);
+	return 0;
+}