Added nioTSO's EA MicroTalk encoder to the project

library/tools/utkencode/utkdecode-bnb.c

@@ -0,0 +1,167 @@
+/*
+** utkdecode-bnb
+** Decode Beasts & Bumpkins M10 to wav.
+** Authors: Andrew D'Addesio
+** License: Public domain
+** Compile: gcc -Wall -Wextra -Wno-unused-function -ansi -pedantic -O2 -ffast-math
+**          -fwhole-program -g0 -s -o utkdecode-bnb utkdecode-bnb.c
+*/
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include "utk.h"
+#include "io.h"
+#include "eachunk.h"
+
+#define MAKE_U32(a,b,c,d) ((a)|((b)<<8)|((c)<<16)|((d)<<24))
+#define ROUND(x) ((x) >= 0.0f ? ((x)+0.5f) : ((x)-0.5f))
+#define MIN(x,y) ((x)<(y)?(x):(y))
+#define MAX(x,y) ((x)>(y)?(x):(y))
+#define CLAMP(x,min,max) MIN(MAX(x,min),max)
+
+typedef struct PTContext {
+    FILE *infp, *outfp;
+    uint32_t num_samples;
+    uint32_t compression_type;
+    UTKContext utk;
+} PTContext;
+
+static void pt_read_header(PTContext *pt)
+{
+    EAChunk *chunk = read_chunk(pt->infp);
+
+    if ((chunk->type & 0xffff) != MAKE_U32('P','T','\x00','\x00')) {
+        fprintf(stderr, "error: expected PT chunk\n");
+        exit(EXIT_FAILURE);
+    }
+
+    while (1) {
+        uint8_t cmd = chunk_read_u8(chunk);
+        if (cmd == 0xFD) {
+            while (1) {
+                uint8_t key = chunk_read_u8(chunk);
+                uint32_t value = chunk_read_var_int(chunk);
+
+                if (key == 0xFF)
+                    break;
+                else if (key == 0x85)
+                    pt->num_samples = value;
+                else if (key == 0x83)
+                    pt->compression_type = value;
+            }
+            break;
+        } else {
+            chunk_read_var_int(chunk);
+        }
+    }
+
+    if (pt->compression_type != 9) {
+        fprintf(stderr, "error: invalid compression type %u (expected 9 for MicroTalk 10:1)\n",
+                (unsigned)pt->compression_type);
+        exit(EXIT_FAILURE);
+    }
+
+    if (pt->num_samples >= 0x01000000) {
+        fprintf(stderr, "error: invalid num_samples %u\n", pt->num_samples);
+        exit(EXIT_FAILURE);
+    }
+
+    /* Initialize the decoder. */
+    utk_init(&pt->utk);
+
+    /* Write the WAV header. */
+    write_u32(pt->outfp, MAKE_U32('R','I','F','F'));
+    write_u32(pt->outfp, 36 + pt->num_samples*2);
+    write_u32(pt->outfp, MAKE_U32('W','A','V','E'));
+    write_u32(pt->outfp, MAKE_U32('f','m','t',' '));
+    write_u32(pt->outfp, 16);
+    write_u16(pt->outfp, 1);
+    write_u16(pt->outfp, 1);
+    write_u32(pt->outfp, 22050);
+    write_u32(pt->outfp, 22050*2);
+    write_u16(pt->outfp, 2);
+    write_u16(pt->outfp, 16);
+    write_u32(pt->outfp, MAKE_U32('d','a','t','a'));
+    write_u32(pt->outfp, pt->num_samples*2);
+}
+
+static void pt_decode(PTContext *pt)
+{
+    UTKContext *utk = &pt->utk;
+    uint32_t num_samples = pt->num_samples;
+
+    utk_set_fp(utk, pt->infp);
+
+    while (num_samples > 0) {
+        int count = MIN(num_samples, 432);
+        int i;
+
+        utk_decode_frame(utk);
+
+        for (i = 0; i < count; i++) {
+            int x = ROUND(pt->utk.decompressed_frame[i]);
+            write_u16(pt->outfp, (int16_t)CLAMP(x, -32768, 32767));
+        }
+
+        num_samples -= count;
+    }
+}
+
+int main(int argc, char *argv[])
+{
+    PTContext pt;
+    const char *infile, *outfile;
+    FILE *infp, *outfp;
+    int force = 0;
+
+    /* Parse arguments. */
+    if (argc == 4 && !strcmp(argv[1], "-f")) {
+        force = 1;
+        argv++, argc--;
+    }
+
+    if (argc != 3) {
+        printf("Usage: utkdecode-bnb [-f] infile outfile\n");
+        printf("Decode Beasts & Bumpkins M10 to wav.\n");
+        return EXIT_FAILURE;
+    }
+
+    infile = argv[1];
+    outfile = argv[2];
+
+    /* Open the input/output files. */
+    infp = fopen(infile, "rb");
+    if (!infp) {
+        fprintf(stderr, "error: failed to open '%s' for reading: %s\n", infile, strerror(errno));
+        return EXIT_FAILURE;
+    }
+
+    if (!force && fopen(outfile, "rb")) {
+        fprintf(stderr, "error: '%s' already exists\n", outfile);
+        return EXIT_FAILURE;
+    }
+
+    outfp = fopen(outfile, "wb");
+    if (!outfp) {
+        fprintf(stderr, "error: failed to create '%s': %s\n", outfile, strerror(errno));
+        return EXIT_FAILURE;
+    }
+
+    memset(&pt, 0, sizeof(pt));
+    pt.infp = infp;
+    pt.outfp = outfp;
+
+    pt_read_header(&pt);
+    pt_decode(&pt);
+
+    if (fclose(outfp) != 0) {
+        fprintf(stderr, "error: failed to close '%s': %s\n", outfile, strerror(errno));
+        return EXIT_FAILURE;
+    }
+
+    fclose(infp);
+
+    return EXIT_SUCCESS;
+}