mirror of
https://github.com/coop-deluxe/sm64coopdx.git
synced 2025-10-30 08:01:01 +00:00
677 lines
19 KiB
C
677 lines
19 KiB
C
/**
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* Bruteforcing decoder for converting ADPCM-encoded AIFC into AIFF, in a way
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* that roundtrips with vadpcm_enc.
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*/
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#include <unistd.h>
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#include <assert.h>
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#include <math.h>
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#include <string.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdarg.h>
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typedef signed char s8;
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typedef short s16;
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typedef int s32;
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typedef unsigned char u8;
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typedef unsigned short u16;
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typedef unsigned int u32;
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typedef unsigned long long u64;
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typedef float f32;
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#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
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# define bswap16(x) (x)
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# define bswap32(x) (x)
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# define BSWAP16(x)
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# define BSWAP32(x)
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# define BSWAP16_MANY(x, n)
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#else
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# define bswap16(x) __builtin_bswap16(x)
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# define bswap32(x) __builtin_bswap32(x)
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# define BSWAP16(x) x = __builtin_bswap16(x)
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# define BSWAP32(x) x = __builtin_bswap32(x)
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# define BSWAP16_MANY(x, n) for (s32 _i = 0; _i < n; _i++) BSWAP16((x)[_i])
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#endif
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#define NORETURN __attribute__((noreturn))
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#define UNUSED __attribute__((unused))
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typedef struct {
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u32 ckID;
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u32 ckSize;
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} ChunkHeader;
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typedef struct {
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u32 ckID;
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u32 ckSize;
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u32 formType;
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} Chunk;
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typedef struct {
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s16 numChannels;
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u16 numFramesH;
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u16 numFramesL;
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s16 sampleSize;
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s16 sampleRate[5]; // 80-bit float
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u16 compressionTypeH;
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u16 compressionTypeL;
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} CommonChunk;
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typedef struct {
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s16 MarkerID;
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u16 positionH;
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u16 positionL;
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} Marker;
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typedef struct {
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s16 playMode;
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s16 beginLoop;
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s16 endLoop;
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} Loop;
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typedef struct {
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s8 baseNote;
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s8 detune;
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s8 lowNote;
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s8 highNote;
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s8 lowVelocity;
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s8 highVelocity;
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s16 gain;
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Loop sustainLoop;
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Loop releaseLoop;
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} InstrumentChunk;
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typedef struct {
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s32 offset;
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s32 blockSize;
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} SoundDataChunk;
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typedef struct {
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s16 version;
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s16 order;
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s16 nEntries;
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} CodeChunk;
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typedef struct
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{
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u32 start;
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u32 end;
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u32 count;
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s16 state[16];
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} ALADPCMloop;
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static char usage[] = "input.aifc output.aiff";
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static const char *progname, *infilename;
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#define checked_fread(a, b, c, d) if (fread(a, b, c, d) != c) fail_parse("error parsing file")
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NORETURN
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void fail_parse(const char *fmt, ...)
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{
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char *formatted = NULL;
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va_list ap;
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va_start(ap, fmt);
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int size = vsnprintf(NULL, 0, fmt, ap);
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va_end(ap);
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if (size >= 0) {
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size++;
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formatted = malloc(size);
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if (formatted != NULL) {
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va_start(ap, fmt);
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size = vsnprintf(formatted, size, fmt, ap);
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va_end(ap);
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if (size < 0) {
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free(formatted);
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formatted = NULL;
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}
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}
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}
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if (formatted != NULL) {
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fprintf(stderr, "%s: %s [%s]\n", progname, formatted, infilename);
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free(formatted);
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}
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exit(1);
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}
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s32 myrand()
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{
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static u64 state = 1619236481962341ULL;
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state *= 3123692312231ULL;
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state++;
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return state >> 33;
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}
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s16 qsample(s32 x, s32 scale)
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{
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// Compute x / 2^scale rounded to the nearest integer, breaking ties towards zero.
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if (scale == 0) return x;
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return (x + (1 << (scale - 1)) - (x > 0)) >> scale;
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}
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s16 clamp_to_s16(s32 x)
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{
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if (x < -0x8000) return -0x8000;
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if (x > 0x7fff) return 0x7fff;
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return (s16) x;
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}
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s32 toi4(s32 x)
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{
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if (x >= 8) return x - 16;
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return x;
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}
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s32 readaifccodebook(FILE *fhandle, s32 ****table, s16 *order, s16 *npredictors)
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{
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checked_fread(order, sizeof(s16), 1, fhandle);
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BSWAP16(*order);
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checked_fread(npredictors, sizeof(s16), 1, fhandle);
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BSWAP16(*npredictors);
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*table = malloc(*npredictors * sizeof(s32 **));
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for (s32 i = 0; i < *npredictors; i++) {
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(*table)[i] = malloc(8 * sizeof(s32 *));
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for (s32 j = 0; j < 8; j++) {
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(*table)[i][j] = malloc((*order + 8) * sizeof(s32));
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}
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}
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for (s32 i = 0; i < *npredictors; i++) {
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s32 **table_entry = (*table)[i];
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for (s32 j = 0; j < *order; j++) {
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for (s32 k = 0; k < 8; k++) {
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s16 ts;
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checked_fread(&ts, sizeof(s16), 1, fhandle);
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BSWAP16(ts);
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table_entry[k][j] = ts;
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}
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}
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for (s32 k = 1; k < 8; k++) {
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table_entry[k][*order] = table_entry[k - 1][*order - 1];
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}
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table_entry[0][*order] = 1 << 11;
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for (s32 k = 1; k < 8; k++) {
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s32 j = 0;
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for (; j < k; j++) {
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table_entry[j][k + *order] = 0;
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}
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for (; j < 8; j++) {
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table_entry[j][k + *order] = table_entry[j - k][*order];
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}
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}
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}
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return 0;
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}
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ALADPCMloop *readlooppoints(FILE *ifile, s16 *nloops)
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{
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checked_fread(nloops, sizeof(s16), 1, ifile);
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BSWAP16(*nloops);
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ALADPCMloop *al = malloc(*nloops * sizeof(ALADPCMloop));
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for (s32 i = 0; i < *nloops; i++) {
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checked_fread(&al[i], sizeof(ALADPCMloop), 1, ifile);
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BSWAP32(al[i].start);
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BSWAP32(al[i].end);
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BSWAP32(al[i].count);
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BSWAP16_MANY(al[i].state, 16);
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}
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return al;
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}
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s32 inner_product(s32 length, s32 *v1, s32 *v2)
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{
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s32 out = 0;
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for (s32 i = 0; i < length; i++) {
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out += v1[i] * v2[i];
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}
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// Compute "out / 2^11", rounded down.
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s32 dout = out / (1 << 11);
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s32 fiout = dout * (1 << 11);
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return dout - (out - fiout < 0);
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}
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void my_decodeframe(u8 *frame, s32 *state, s32 order, s32 ***coefTable)
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{
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s32 ix[16];
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u8 header = frame[0];
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s32 scale = 1 << (header >> 4);
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s32 optimalp = header & 0xf;
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for (s32 i = 0; i < 16; i += 2) {
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u8 c = frame[1 + i/2];
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ix[i] = c >> 4;
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ix[i + 1] = c & 0xf;
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}
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for (s32 i = 0; i < 16; i++) {
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if (ix[i] >= 8) ix[i] -= 16;
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ix[i] *= scale;
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}
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for (s32 j = 0; j < 2; j++) {
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s32 in_vec[16];
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if (j == 0) {
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for (s32 i = 0; i < order; i++) {
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in_vec[i] = state[16 - order + i];
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}
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} else {
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for (s32 i = 0; i < order; i++) {
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in_vec[i] = state[8 - order + i];
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}
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}
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for (s32 i = 0; i < 8; i++) {
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s32 ind = j * 8 + i;
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in_vec[order + i] = ix[ind];
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state[ind] = inner_product(order + i, coefTable[optimalp][i], in_vec) + ix[ind];
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}
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}
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}
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void my_encodeframe(u8 *out, s16 *inBuffer, s32 *state, s32 ***coefTable, s32 order, s32 npredictors)
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{
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s16 ix[16];
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s32 prediction[16];
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s32 inVector[16];
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s32 saveState[16];
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s32 optimalp = 0;
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s32 scale;
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s32 ie[16];
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s32 e[16];
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f32 min = 1e30;
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for (s32 k = 0; k < npredictors; k++) {
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for (s32 j = 0; j < 2; j++) {
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for (s32 i = 0; i < order; i++) {
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inVector[i] = (j == 0 ? state[16 - order + i] : inBuffer[8 - order + i]);
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}
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for (s32 i = 0; i < 8; i++) {
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prediction[j * 8 + i] = inner_product(order + i, coefTable[k][i], inVector);
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e[j * 8 + i] = inVector[i + order] = inBuffer[j * 8 + i] - prediction[j * 8 + i];
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}
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}
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f32 se = 0.0f;
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for (s32 j = 0; j < 16; j++) {
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se += (f32) e[j] * (f32) e[j];
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}
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if (se < min) {
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min = se;
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optimalp = k;
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}
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}
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for (s32 j = 0; j < 2; j++) {
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for (s32 i = 0; i < order; i++) {
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inVector[i] = (j == 0 ? state[16 - order + i] : inBuffer[8 - order + i]);
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}
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for (s32 i = 0; i < 8; i++) {
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prediction[j * 8 + i] = inner_product(order + i, coefTable[optimalp][i], inVector);
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e[j * 8 + i] = inVector[i + order] = inBuffer[j * 8 + i] - prediction[j * 8 + i];
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}
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}
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for (s32 i = 0; i < 16; i++) {
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ie[i] = clamp_to_s16(e[i]);
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}
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s32 max = 0;
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for (s32 i = 0; i < 16; i++) {
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if (abs(ie[i]) > abs(max)) {
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max = ie[i];
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}
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}
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for (scale = 0; scale <= 12; scale++) {
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if (max <= 7 && max >= -8) break;
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max /= 2;
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}
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for (s32 i = 0; i < 16; i++) {
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saveState[i] = state[i];
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}
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for (s32 nIter = 0, again = 1; nIter < 2 && again; nIter++) {
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again = 0;
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if (nIter == 1) scale++;
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if (scale > 12) {
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scale = 12;
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}
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for (s32 j = 0; j < 2; j++) {
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s32 base = j * 8;
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for (s32 i = 0; i < order; i++) {
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inVector[i] = (j == 0 ?
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saveState[16 - order + i] : state[8 - order + i]);
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}
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for (s32 i = 0; i < 8; i++) {
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prediction[base + i] = inner_product(order + i, coefTable[optimalp][i], inVector);
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s32 se = inBuffer[base + i] - prediction[base + i];
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ix[base + i] = qsample(se, scale);
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s32 cV = clamp_to_s16(ix[base + i]) - ix[base + i];
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if (cV > 1 || cV < -1) again = 1;
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ix[base + i] += cV;
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inVector[i + order] = ix[base + i] * (1 << scale);
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state[base + i] = prediction[base + i] + inVector[i + order];
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}
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}
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}
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u8 header = (scale << 4) | (optimalp & 0xf);
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out[0] = header;
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for (s32 i = 0; i < 16; i += 2) {
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u8 c = ((ix[i] & 0xf) << 4) | (ix[i + 1] & 0xf);
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out[1 + i/2] = c;
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}
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}
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void permute(s16 *out, s32 *in, s32 scale)
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{
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for (s32 i = 0; i < 16; i++) {
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out[i] = clamp_to_s16(in[i] - scale / 2 + myrand() % (scale + 1));
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}
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}
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void write_header(FILE *ofile, const char *id, s32 size)
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{
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fwrite(id, 4, 1, ofile);
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BSWAP32(size);
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fwrite(&size, sizeof(s32), 1, ofile);
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}
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int main(int argc, char **argv)
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{
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s16 order = -1;
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s16 nloops = 0;
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ALADPCMloop *aloops = NULL;
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s16 npredictors = -1;
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s32 ***coefTable = NULL;
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s32 state[16];
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s32 soundPointer = -1;
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s32 currPos = 0;
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s32 nSamples = 0;
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Chunk FormChunk;
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ChunkHeader Header;
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CommonChunk CommChunk;
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InstrumentChunk InstChunk;
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SoundDataChunk SndDChunk;
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FILE *ifile;
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FILE *ofile;
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progname = argv[0];
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if (argc < 3) {
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fprintf(stderr, "%s %s\n", progname, usage);
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exit(1);
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}
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infilename = argv[1];
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if ((ifile = fopen(infilename, "rb")) == NULL) {
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fail_parse("AIFF-C file could not be opened");
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exit(1);
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}
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if ((ofile = fopen(argv[2], "wb")) == NULL) {
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fprintf(stderr, "%s: output file could not be opened [%s]\n", progname, argv[2]);
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exit(1);
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}
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memset(&InstChunk, 0, sizeof(InstChunk));
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checked_fread(&FormChunk, sizeof(FormChunk), 1, ifile);
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BSWAP32(FormChunk.ckID);
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BSWAP32(FormChunk.formType);
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if ((FormChunk.ckID != 0x464f524d) || (FormChunk.formType != 0x41494643)) { // FORM, AIFC
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fail_parse("not an AIFF-C file");
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}
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for (;;) {
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s32 num = fread(&Header, sizeof(Header), 1, ifile);
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u32 ts;
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if (num <= 0) break;
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BSWAP32(Header.ckID);
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BSWAP32(Header.ckSize);
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Header.ckSize++;
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Header.ckSize &= ~1;
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s32 offset = ftell(ifile);
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switch (Header.ckID) {
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case 0x434f4d4d: // COMM
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checked_fread(&CommChunk, sizeof(CommChunk), 1, ifile);
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BSWAP16(CommChunk.numChannels);
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BSWAP16(CommChunk.numFramesH);
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BSWAP16(CommChunk.numFramesL);
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BSWAP16(CommChunk.sampleSize);
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BSWAP16(CommChunk.compressionTypeH);
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BSWAP16(CommChunk.compressionTypeL);
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s32 cType = (CommChunk.compressionTypeH << 16) + CommChunk.compressionTypeL;
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if (cType != 0x56415043) { // VAPC
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fail_parse("file is of the wrong compression type");
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}
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if (CommChunk.numChannels != 1) {
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fail_parse("file contains %d channels, only 1 channel supported", CommChunk.numChannels);
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}
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if (CommChunk.sampleSize != 16) {
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fail_parse("file contains %d bit samples, only 16 bit samples supported", CommChunk.sampleSize);
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}
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nSamples = (CommChunk.numFramesH << 16) + CommChunk.numFramesL;
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// Allow broken input lengths
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if (nSamples % 16) {
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nSamples--;
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}
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if (nSamples % 16 != 0) {
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fail_parse("number of chunks must be a multiple of 16, found %d", nSamples);
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}
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break;
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case 0x53534e44: // SSND
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checked_fread(&SndDChunk, sizeof(SndDChunk), 1, ifile);
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BSWAP32(SndDChunk.offset);
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BSWAP32(SndDChunk.blockSize);
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assert(SndDChunk.offset == 0);
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assert(SndDChunk.blockSize == 0);
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soundPointer = ftell(ifile);
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break;
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case 0x4150504c: // APPL
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checked_fread(&ts, sizeof(u32), 1, ifile);
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BSWAP32(ts);
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if (ts == 0x73746f63) { // stoc
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u8 len;
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checked_fread(&len, 1, 1, ifile);
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if (len == 11) {
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char ChunkName[12];
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s16 version;
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checked_fread(ChunkName, 11, 1, ifile);
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ChunkName[11] = '\0';
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if (strcmp("VADPCMCODES", ChunkName) == 0) {
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checked_fread(&version, sizeof(s16), 1, ifile);
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BSWAP16(version);
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if (version != 1) {
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fail_parse("Unknown codebook chunk version");
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}
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readaifccodebook(ifile, &coefTable, &order, &npredictors);
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}
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else if (strcmp("VADPCMLOOPS", ChunkName) == 0) {
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checked_fread(&version, sizeof(s16), 1, ifile);
|
|
BSWAP16(version);
|
|
if (version != 1) {
|
|
fail_parse("Unknown loop chunk version");
|
|
}
|
|
aloops = readlooppoints(ifile, &nloops);
|
|
if (nloops != 1) {
|
|
fail_parse("Only a single loop supported");
|
|
}
|
|
}
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
|
|
fseek(ifile, offset + Header.ckSize, SEEK_SET);
|
|
}
|
|
|
|
if (coefTable == NULL) {
|
|
fail_parse("Codebook missing from bitstream");
|
|
}
|
|
|
|
for (s32 i = 0; i < order; i++) {
|
|
state[15 - i] = 0;
|
|
}
|
|
|
|
u32 outputBytes = nSamples * sizeof(s16);
|
|
u8 *outputBuf = malloc(outputBytes);
|
|
|
|
fseek(ifile, soundPointer, SEEK_SET);
|
|
while (currPos < nSamples) {
|
|
u8 input[9];
|
|
u8 encoded[9];
|
|
s32 lastState[16];
|
|
s32 decoded[16];
|
|
s16 guess[16];
|
|
s16 origGuess[16];
|
|
|
|
memcpy(lastState, state, sizeof(lastState));
|
|
checked_fread(input, 9, 1, ifile);
|
|
|
|
// Decode for real
|
|
my_decodeframe(input, state, order, coefTable);
|
|
memcpy(decoded, state, sizeof(lastState));
|
|
|
|
// Create a guess from that, by clamping to 16 bits
|
|
for (s32 i = 0; i < 16; i++) {
|
|
origGuess[i] = clamp_to_s16(state[i]);
|
|
}
|
|
|
|
// Encode the guess
|
|
memcpy(state, lastState, sizeof(lastState));
|
|
memcpy(guess, origGuess, sizeof(guess));
|
|
my_encodeframe(encoded, guess, state, coefTable, order, npredictors);
|
|
|
|
// If it doesn't match, randomly round numbers until it does.
|
|
if (memcmp(input, encoded, 9) != 0) {
|
|
s32 scale = 1 << (input[0] >> 4);
|
|
do {
|
|
permute(guess, decoded, scale);
|
|
memcpy(state, lastState, sizeof(lastState));
|
|
my_encodeframe(encoded, guess, state, coefTable, order, npredictors);
|
|
} while (memcmp(input, encoded, 9) != 0);
|
|
|
|
// Bring the matching closer to the original decode (not strictly
|
|
// necessary, but it will move us closer to the target on average).
|
|
for (s32 failures = 0; failures < 50; failures++) {
|
|
s32 ind = myrand() % 16;
|
|
s32 old = guess[ind];
|
|
if (old == origGuess[ind]) continue;
|
|
guess[ind] = origGuess[ind];
|
|
if (myrand() % 2) guess[ind] += (old - origGuess[ind]) / 2;
|
|
memcpy(state, lastState, sizeof(lastState));
|
|
my_encodeframe(encoded, guess, state, coefTable, order, npredictors);
|
|
if (memcmp(input, encoded, 9) == 0) {
|
|
failures = -1;
|
|
}
|
|
else {
|
|
guess[ind] = old;
|
|
}
|
|
}
|
|
}
|
|
|
|
memcpy(state, decoded, sizeof(lastState));
|
|
BSWAP16_MANY(guess, 16);
|
|
memcpy(outputBuf + currPos * 2, guess, sizeof(guess));
|
|
currPos += 16;
|
|
}
|
|
|
|
// Write an incomplete file header. We'll fill in the size later.
|
|
fwrite("FORM\0\0\0\0AIFF", 12, 1, ofile);
|
|
|
|
// Subtract 4 from the COMM size to skip the compression field.
|
|
write_header(ofile, "COMM", sizeof(CommonChunk) - 4);
|
|
CommChunk.numFramesH = nSamples >> 16;
|
|
CommChunk.numFramesL = nSamples & 0xffff;
|
|
BSWAP16(CommChunk.numChannels);
|
|
BSWAP16(CommChunk.numFramesH);
|
|
BSWAP16(CommChunk.numFramesL);
|
|
BSWAP16(CommChunk.sampleSize);
|
|
fwrite(&CommChunk, sizeof(CommonChunk) - 4, 1, ofile);
|
|
|
|
if (nloops > 0) {
|
|
s32 startPos = aloops[0].start, endPos = aloops[0].end;
|
|
const char *markerNames[2] = {"start", "end"};
|
|
Marker markers[2] = {
|
|
{1, startPos >> 16, startPos & 0xffff},
|
|
{2, endPos >> 16, endPos & 0xffff}
|
|
};
|
|
write_header(ofile, "MARK", 2 + 2 * sizeof(Marker) + 1 + 5 + 1 + 3);
|
|
s16 numMarkers = bswap16(2);
|
|
fwrite(&numMarkers, sizeof(s16), 1, ofile);
|
|
for (s32 i = 0; i < 2; i++) {
|
|
u8 len = (u8) strlen(markerNames[i]);
|
|
BSWAP16(markers[i].MarkerID);
|
|
BSWAP16(markers[i].positionH);
|
|
BSWAP16(markers[i].positionL);
|
|
fwrite(&markers[i], sizeof(Marker), 1, ofile);
|
|
fwrite(&len, 1, 1, ofile);
|
|
fwrite(markerNames[i], len, 1, ofile);
|
|
}
|
|
|
|
write_header(ofile, "INST", sizeof(InstrumentChunk));
|
|
InstChunk.sustainLoop.playMode = bswap16(1);
|
|
InstChunk.sustainLoop.beginLoop = bswap16(1);
|
|
InstChunk.sustainLoop.endLoop = bswap16(2);
|
|
InstChunk.releaseLoop.playMode = 0;
|
|
InstChunk.releaseLoop.beginLoop = 0;
|
|
InstChunk.releaseLoop.endLoop = 0;
|
|
fwrite(&InstChunk, sizeof(InstrumentChunk), 1, ofile);
|
|
}
|
|
|
|
// Save the coefficient table for use when encoding. Ideally this wouldn't
|
|
// be needed and "tabledesign -s 1" would generate the right table, but in
|
|
// practice it's difficult to adjust samples to make that happen.
|
|
write_header(ofile, "APPL", 4 + 12 + sizeof(CodeChunk) + npredictors * order * 8 * 2);
|
|
fwrite("stoc", 4, 1, ofile);
|
|
CodeChunk cChunk;
|
|
cChunk.version = bswap16(1);
|
|
cChunk.order = bswap16(order);
|
|
cChunk.nEntries = bswap16(npredictors);
|
|
fwrite("\x0bVADPCMCODES", 12, 1, ofile);
|
|
fwrite(&cChunk, sizeof(CodeChunk), 1, ofile);
|
|
for (s32 i = 0; i < npredictors; i++) {
|
|
for (s32 j = 0; j < order; j++) {
|
|
for (s32 k = 0; k < 8; k++) {
|
|
s16 ts = bswap16(coefTable[i][k][j]);
|
|
fwrite(&ts, sizeof(s16), 1, ofile);
|
|
}
|
|
}
|
|
}
|
|
|
|
write_header(ofile, "SSND", outputBytes + 8);
|
|
SndDChunk.offset = 0;
|
|
SndDChunk.blockSize = 0;
|
|
fwrite(&SndDChunk, sizeof(SoundDataChunk), 1, ofile);
|
|
fwrite(outputBuf, outputBytes, 1, ofile);
|
|
|
|
// Fix the size in the header
|
|
s32 fileSize = bswap32(ftell(ofile) - 8);
|
|
fseek(ofile, 4, SEEK_SET);
|
|
fwrite(&fileSize, 4, 1, ofile);
|
|
|
|
fclose(ifile);
|
|
fclose(ofile);
|
|
return 0;
|
|
}
|