669 lines
14 KiB
C++
669 lines
14 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 <assert.h>
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#include <math.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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//#include <unistd.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 long long s64;
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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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typedef double f64;
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#ifdef _MSC_VER
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#define __builtin_bswap16 _byteswap_ushort
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#define __builtin_bswap32 _byteswap_ulong
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#endif
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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) \
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for (s32 _i = 0; _i < n; _i++) \
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BSWAP16((x)[_i])
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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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{
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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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{
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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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{
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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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{
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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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{
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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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{
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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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{
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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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{
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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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static int framesize = 9;
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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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{
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size++;
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formatted = (char*)malloc(size);
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if (formatted != NULL)
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{
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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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{
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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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{
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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 *= 3123692312237ULL;
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state += 1;
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return state >> 33;
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}
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s16 qsample(f32 x, s32 scale)
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{
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if (x > 0.0f)
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{
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return (s16)((x / scale) + 0.4999999);
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}
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else
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{
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return (s16)((x / scale) - 0.4999999);
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}
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}
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void clamp_to_s16(f32* in, s32* out)
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{
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f32 llevel = -0x8000;
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f32 ulevel = 0x7fff;
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for (s32 i = 0; i < 16; i++)
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{
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if (in[i] > ulevel)
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in[i] = ulevel;
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if (in[i] < llevel)
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in[i] = llevel;
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if (in[i] > 0.0f)
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{
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out[i] = (s32)(in[i] + 0.5);
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}
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else
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{
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out[i] = (s32)(in[i] - 0.5);
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}
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}
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}
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s16 clamp_bits(s32 x, s32 bits)
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{
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s32 lim = 1 << (bits - 1);
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if (x < -lim)
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return -lim;
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if (x > lim - 1)
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return lim - 1;
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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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BSWAP16(*order);
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BSWAP16(*npredictors);
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*table = (s32***)malloc(*npredictors * sizeof(s32**));
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for (s32 i = 0; i < *npredictors; i++)
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{
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(*table)[i] = (s32**)malloc(8 * sizeof(s32*));
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for (s32 j = 0; j < 8; j++)
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{
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(*table)[i][j] = (s32*)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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{
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s32** table_entry = (*table)[i];
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for (s32 j = 0; j < *order; j++)
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{
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for (s32 k = 0; k < 8; k++)
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{
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s16 ts = 0;
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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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{
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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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{
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s32 j = 0;
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for (; j < k; j++)
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{
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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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{
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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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BSWAP16(*nloops);
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ALADPCMloop* al = (ALADPCMloop*)malloc(*nloops * sizeof(ALADPCMloop));
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for (s32 i = 0; i < *nloops; i++)
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{
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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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{
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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* decompressed, 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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if (framesize == 5)
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{
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for (s32 i = 0; i < 16; i += 4)
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{
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u8 c = frame[1 + i / 4];
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ix[i] = c >> 6;
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ix[i + 1] = (c >> 4) & 0x3;
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ix[i + 2] = (c >> 2) & 0x3;
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ix[i + 3] = c & 0x3;
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}
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}
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else
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{
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for (s32 i = 0; i < 16; i += 2)
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{
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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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}
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for (s32 i = 0; i < 16; i++)
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{
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if (framesize == 5)
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{
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if (ix[i] >= 2)
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ix[i] -= 4;
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}
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else
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{
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if (ix[i] >= 8)
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ix[i] -= 16;
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}
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decompressed[i] = ix[i];
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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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{
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s32 in_vec[16];
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if (j == 0)
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{
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for (s32 i = 0; i < order; i++)
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{
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in_vec[i] = state[16 - order + i];
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}
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}
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else
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{
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for (s32 i = 0; i < order; i++)
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{
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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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{
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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 get_bounds(s32* in, s32* decompressed, s32 scale, s32* minVals, s32* maxVals)
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{
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s32 minv, maxv;
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if (framesize == 9)
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{
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minv = -8;
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maxv = 7;
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}
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else
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{
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minv = -2;
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maxv = 1;
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}
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for (s32 i = 0; i < 16; i++)
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{
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s32 lo = in[i] - scale / 2;
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s32 hi = in[i] + scale / 2;
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lo -= scale;
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hi += scale;
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if (decompressed[i] == minv)
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lo -= scale;
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else if (decompressed[i] == maxv)
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hi += scale;
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minVals[i] = lo;
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maxVals[i] = hi;
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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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char* OldMain(char* infilename)
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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 decompressed[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 = Chunk();
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ChunkHeader Header = ChunkHeader();
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CommonChunk CommChunk = CommonChunk();
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InstrumentChunk InstChunk;
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SoundDataChunk SndDChunk = SoundDataChunk();
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FILE* ifile = NULL;
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FILE* ofile = NULL;
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if ((ifile = fopen(infilename, "rb")) == NULL)
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{
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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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memset(&InstChunk, 0, sizeof(InstChunk));
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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))
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{ // 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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{
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s32 num = fread(&Header, sizeof(Header), 1, ifile);
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u32 ts = 0;
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if (num <= 0)
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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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{
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case 0x434f4d4d: // COMM
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{
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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 || cType == 0x41445039)
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{ // VAPC or ADP9
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framesize = 9;
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}
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else if (cType == 0x41445035)
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{ // ADP5
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framesize = 5;
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}
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else if (cType == 0x4850434d)
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{ // HPCM
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framesize = 16;
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}
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else
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{
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char comprType[5] = {
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CommChunk.compressionTypeH >> 8, CommChunk.compressionTypeH & 0xFF,
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CommChunk.compressionTypeL >> 8, CommChunk.compressionTypeL & 0xFF, 0};
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fail_parse("file is of the wrong compression type [got %s (%08x)]", &comprType,
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cType);
|
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}
|
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if (CommChunk.numChannels != 1)
|
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{
|
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fail_parse("file contains %d channels, only 1 channel supported",
|
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CommChunk.numChannels);
|
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}
|
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if (CommChunk.sampleSize != 16)
|
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{
|
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fail_parse("file contains %d bit samples, only 16 bit samples supported",
|
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CommChunk.sampleSize);
|
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}
|
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|
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nSamples = (CommChunk.numFramesH << 16) + CommChunk.numFramesL;
|
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|
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// Allow broken input lengths
|
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if (nSamples % 16)
|
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{
|
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nSamples -= (nSamples % 16);
|
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}
|
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|
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if (nSamples % 16 != 0)
|
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{
|
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fail_parse("number of chunks must be a multiple of 16, found %d with remainder %d",
|
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nSamples, nSamples % 16);
|
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}
|
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}
|
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break;
|
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|
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case 0x53534e44: // SSND
|
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BSWAP32(SndDChunk.offset);
|
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BSWAP32(SndDChunk.blockSize);
|
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assert(SndDChunk.offset == 0);
|
|
assert(SndDChunk.blockSize == 0);
|
|
soundPointer = ftell(ifile);
|
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break;
|
|
|
|
case 0x4150504c: // APPL
|
|
BSWAP32(ts);
|
|
if (ts == 0x73746f63)
|
|
{ // stoc
|
|
u8 len = 0;
|
|
if (len == 11)
|
|
{
|
|
char ChunkName[12];
|
|
s16 version;
|
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ChunkName[11] = '\0';
|
|
if (strcmp("VADPCMCODES", ChunkName) == 0)
|
|
{
|
|
BSWAP16(version);
|
|
if (version != 1)
|
|
{
|
|
fail_parse("Unknown codebook chunk version");
|
|
}
|
|
readaifccodebook(ifile, &coefTable, &order, &npredictors);
|
|
}
|
|
else if (strcmp("VADPCMLOOPS", ChunkName) == 0)
|
|
{
|
|
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");
|
|
}
|
|
}
|
|
}
|
|
}
|
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break;
|
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}
|
|
|
|
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 = (u8*)malloc(outputBytes);
|
|
|
|
fseek(ifile, soundPointer, SEEK_SET);
|
|
s32 fails = 0;
|
|
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(state));
|
|
|
|
// Decode for real
|
|
my_decodeframe(input, decompressed, state, order, coefTable);
|
|
memcpy(decoded, state, sizeof(state));
|
|
|
|
// Create a guess from that, by clamping to 16 bits
|
|
for (s32 i = 0; i < 16; i++)
|
|
{
|
|
origGuess[i] = clamp_bits(state[i], 16);
|
|
}
|
|
|
|
memcpy(state, decoded, sizeof(state));
|
|
memcpy(outputBuf + currPos * 2, decoded, sizeof(decoded));
|
|
currPos += 16;
|
|
}
|
|
if (fails)
|
|
{
|
|
fprintf(stderr, "%s %d\n", infilename, fails);
|
|
}
|
|
|
|
// 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;
|
|
} |