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neotools: adpcm-a split backend code

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a dinosaur
2023-12-10 11:36:05 +11:00
parent 46c78c24e1
commit ae14868953
3 changed files with 58 additions and 50 deletions
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2
neotools/CMakeLists.txt
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@@ -4,7 +4,7 @@ if (USE_ZLIB AND NOT ZLIB_FOUND)
message(FATAL_ERROR "USE_ZLIB specified but Zlib was not found")
endif()
add_executable(adpcm adpcm.h adpcm.c)
add_executable(adpcm adpcm.h libadpcma.c adpcm.c)
set_property(TARGET adpcm PROPERTY C_STANDARD 99)
target_compile_options(adpcm PRIVATE ${WARNINGS})
target_link_libraries(adpcm Common::wave $<$<C_COMPILER_ID:Clang,GNU>:m>)

49
neotools/adpcm.c
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@@ -3,25 +3,13 @@
*/
#include "adpcm.h"
#include "util.h"
#include "wave.h"
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#define BUFFER_SIZE (1024 * 256)
#define ADPCMA_VOLUME_RATE 1
#define ADPCMA_DECODE_RANGE 1024
#define ADPCMA_DECODE_MIN (-(ADPCMA_DECODE_RANGE * ADPCMA_VOLUME_RATE))
#define ADPCMA_DECODE_MAX ((ADPCMA_DECODE_RANGE * ADPCMA_VOLUME_RATE) - 1)
static const int decodeTableA1[16] =
{
-1 * 16, -1 * 16, -1 * 16, -1 * 16, 2 * 16, 5 * 16, 7 * 16, 9 * 16,
-1 * 16, -1 * 16, -1 * 16, -1 * 16, 2 * 16, 5 * 16, 7 * 16, 9 * 16
};
int main(int argc, char* argv[])
{
fprintf(stderr, "**** ADPCM to PCM converter v 1.01\n\n");
@@ -98,40 +86,3 @@ int main(int argc, char* argv[])
return 0;
}
void adpcmAInit(AdpcmADecoderState* decoder)
{
for (int step = 0; step <= 48; step++)
{
int stepval = floor(16.0 * pow(11.0 / 10.0, step) * ADPCMA_VOLUME_RATE);
// Loop over all nibbles and compute the difference
for (int nib = 0; nib < 16; nib++)
{
int value = stepval * ((nib & 0x07) * 2 + 1) / 8;
decoder->jediTable[step * 16 + nib] = (nib & 0x08) ? -value : value;
}
}
decoder->delta = 0;
decoder->cursignal = 0;
}
void adpcmADecode(AdpcmADecoderState* restrict decoder, char* restrict in, short* restrict out, int len)
{
for (int i = 0; i < len * 2; ++i)
{
int data = (!(i & 0x1) ? ((*in) >> 4) : (*in++)) & 0x0F;
int oldsignal = decoder->cursignal;
decoder->cursignal = CLAMP(decoder->cursignal + decoder->jediTable[data + decoder->delta],
ADPCMA_DECODE_MIN, ADPCMA_DECODE_MAX);
decoder->delta = CLAMP(decoder->delta + decodeTableA1[data], 0 * 16, 48 * 16);
if (abs(oldsignal - decoder->cursignal) > 2500)
{
fprintf(stderr, "WARNING: Suspicious signal evolution %06x,%06x pos:%06x delta:%06x\n",
oldsignal, decoder->cursignal, i % len, decoder->delta);
fprintf(stderr, "data:%02x dx:%08x\n",
data, decoder->jediTable[data + decoder->delta]);
}
*(out++) = (decoder->cursignal & 0xffff) * 32;
}
}

57
neotools/libadpcma.c Normal file
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@@ -0,0 +1,57 @@
/* libadpcma.c (C) 2023 a dinosaur (zlib)
Original ADPCM to PCM converter v 1.01 By MARTINEZ Fabrice aka SNK of SUPREMACY */
#include "adpcm.h"
#include "util.h"
#include <math.h>
#include <stdlib.h>
#include <stdio.h>
#define ADPCMA_VOLUME_RATE 1
#define ADPCMA_DECODE_RANGE 1024
#define ADPCMA_DECODE_MIN (-(ADPCMA_DECODE_RANGE * ADPCMA_VOLUME_RATE))
#define ADPCMA_DECODE_MAX ((ADPCMA_DECODE_RANGE * ADPCMA_VOLUME_RATE) - 1)
void adpcmAInit(AdpcmADecoderState* decoder)
{
for (int step = 0; step <= 48; step++)
{
int stepval = floor(16.0 * pow(11.0 / 10.0, step) * ADPCMA_VOLUME_RATE);
// Loop over all nibbles and compute the difference
for (int nib = 0; nib < 16; nib++)
{
int value = stepval * ((nib & 0x07) * 2 + 1) / 8;
decoder->jediTable[step * 16 + nib] = (nib & 0x08) ? -value : value;
}
}
decoder->delta = 0;
decoder->cursignal = 0;
}
static const int decodeTableA1[16] =
{
-1 * 16, -1 * 16, -1 * 16, -1 * 16, 2 * 16, 5 * 16, 7 * 16, 9 * 16,
-1 * 16, -1 * 16, -1 * 16, -1 * 16, 2 * 16, 5 * 16, 7 * 16, 9 * 16
};
void adpcmADecode(AdpcmADecoderState* restrict decoder, char* restrict in, short* restrict out, int len)
{
for (int i = 0; i < len * 2; ++i)
{
int data = (!(i & 0x1) ? ((*in) >> 4) : (*in++)) & 0x0F;
int oldsignal = decoder->cursignal;
decoder->cursignal = CLAMP(decoder->cursignal + decoder->jediTable[data + decoder->delta],
ADPCMA_DECODE_MIN, ADPCMA_DECODE_MAX);
decoder->delta = CLAMP(decoder->delta + decodeTableA1[data], 0 * 16, 48 * 16);
if (abs(oldsignal - decoder->cursignal) > 2500)
{
fprintf(stderr, "WARNING: Suspicious signal evolution %06x,%06x pos:%06x delta:%06x\n",
oldsignal, decoder->cursignal, i % len, decoder->delta);
fprintf(stderr, "data:%02x dx:%08x\n",
data, decoder->jediTable[data + decoder->delta]);
}
*(out++) = (decoder->cursignal & 0xffff) * 32;
}
}