ref: f4ba52e6835e5935ad294b7dbbfbce3fc36d40c1
dir: /src/smploaders/pt2_load_wav.c/
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <stdbool.h>
#include <math.h>
#include "../pt2_header.h"
#include "../pt2_config.h"
#include "../pt2_structs.h"
#include "../pt2_textout.h"
#include "../pt2_visuals.h"
#include "../pt2_helpers.h"
#include "../pt2_replayer.h"
#include "../pt2_askbox.h"
#include "../pt2_downsample2x.h"
#include "../pt2_audio.h"
enum
{
WAV_FORMAT_PCM = 0x0001,
WAV_FORMAT_IEEE_FLOAT = 0x0003
};
bool loadWAVSample(FILE *f, uint32_t filesize, moduleSample_t *s)
{
uint16_t audioFormat, numChannels, bitsPerSample;
uint32_t sampleRate;
// zero out chunk pointers and lengths
uint32_t fmtPtr = 0; uint32_t fmtLen = 0;
uint32_t dataPtr = 0; uint32_t dataLen = 0;
uint32_t inamPtr = 0; int32_t inamLen = 0;
uint32_t xtraPtr = 0; uint32_t xtraLen = 0;
uint32_t smplPtr = 0; uint32_t smplLen = 0;
// look for wanted chunks and set up pointers + lengths
fseek(f, 12, SEEK_SET);
uint32_t bytesRead = 0;
while (!feof(f) && bytesRead < (uint32_t)filesize-12)
{
uint32_t chunkID, chunkSize;
fread(&chunkID, 4, 1, f); if (feof(f)) break;
fread(&chunkSize, 4, 1, f); if (feof(f)) break;
uint32_t endOfChunk = (ftell(f) + chunkSize) + (chunkSize & 1);
switch (chunkID)
{
case 0x20746D66: // "fmt "
{
fmtPtr = ftell(f);
fmtLen = chunkSize;
}
break;
case 0x61746164: // "data"
{
dataPtr = ftell(f);
dataLen = chunkSize;
}
break;
case 0x5453494C: // "LIST"
{
if (chunkSize >= 4)
{
fread(&chunkID, 4, 1, f);
if (chunkID == 0x4F464E49) // "INFO"
{
bytesRead = 0;
while (!feof(f) && bytesRead < chunkSize)
{
fread(&chunkID, 4, 1, f);
fread(&chunkSize, 4, 1, f);
switch (chunkID)
{
case 0x4D414E49: // "INAM"
{
inamPtr = ftell(f);
inamLen = chunkSize;
}
break;
default: break;
}
bytesRead += chunkSize + (chunkSize & 1);
}
}
}
}
break;
case 0x61727478: // "xtra"
{
xtraPtr = ftell(f);
xtraLen = chunkSize;
}
break;
case 0x6C706D73: // "smpl"
{
smplPtr = ftell(f);
smplLen = chunkSize;
}
break;
default: break;
}
bytesRead += chunkSize + (chunkSize & 1);
fseek(f, endOfChunk, SEEK_SET);
}
// we need at least "fmt " and "data" - check if we found them sanely
if (fmtPtr == 0 || fmtLen < 16 || dataPtr == 0 || dataLen == 0)
{
displayErrorMsg("NOT A WAV !");
return false;
}
// ---- READ "fmt " CHUNK ----
fseek(f, fmtPtr, SEEK_SET);
fread(&audioFormat, 2, 1, f);
fread(&numChannels, 2, 1, f);
fread(&sampleRate, 4, 1, f);
fseek(f, 6, SEEK_CUR);
fread(&bitsPerSample, 2, 1, f);
int32_t sampleLength = dataLen;
// ---------------------------
if (sampleRate == 0 || sampleLength == 0 || sampleLength >= (int32_t)filesize*(bitsPerSample/8))
{
displayErrorMsg("WAV CORRUPT !");
return false;
}
if (audioFormat != WAV_FORMAT_PCM && audioFormat != WAV_FORMAT_IEEE_FLOAT)
{
displayErrorMsg("WAV UNSUPPORTED !");
return false;
}
if (numChannels == 0 || numChannels > 2)
{
displayErrorMsg("WAV UNSUPPORTED !");
return false;
}
if (audioFormat == WAV_FORMAT_IEEE_FLOAT && bitsPerSample != 32 && bitsPerSample != 64)
{
displayErrorMsg("WAV UNSUPPORTED !");
return false;
}
if (bitsPerSample != 8 && bitsPerSample != 16 && bitsPerSample != 24 && bitsPerSample != 32 && bitsPerSample != 64)
{
displayErrorMsg("WAV UNSUPPORTED !");
return false;
}
bool downSample = false;
if (sampleRate > 22050 && !config.noDownsampleOnSmpLoad)
{
if (askBox(ASKBOX_DOWNSAMPLE, "DOWNSAMPLE ?"))
downSample = true;
}
// ---- READ SAMPLE DATA ----
fseek(f, dataPtr, SEEK_SET);
int8_t *smpDataPtr = &song->sampleData[s->offset];
if (bitsPerSample == 8) // 8-BIT INTEGER SAMPLE
{
if (sampleLength > config.maxSampleLength*4)
sampleLength = config.maxSampleLength*4;
uint8_t *audioDataU8 = (uint8_t *)malloc(sampleLength * sizeof (uint8_t));
if (audioDataU8 == NULL)
{
statusOutOfMemory();
return false;
}
// read sample data
if (fread(audioDataU8, 1, sampleLength, f) != (size_t)sampleLength)
{
free(audioDataU8);
displayErrorMsg("I/O ERROR !");
return false;
}
// convert from stereo to mono (if needed)
if (numChannels == 2)
{
sampleLength >>= 1;
for (int32_t i = 0; i < sampleLength-1; i++) // add right channel to left channel
{
int32_t smp32 = (audioDataU8[(i << 1) + 0] - 128) + (audioDataU8[(i << 1) + 1] - 128);
smp32 = 128 + (smp32 >> 1);
audioDataU8[i] = (uint8_t)smp32;
}
}
// 2x downsampling
if (downSample)
{
downsample2x8BitU(audioDataU8, sampleLength);
sampleLength >>= 1;
}
if (sampleLength > config.maxSampleLength)
sampleLength = config.maxSampleLength;
turnOffVoices();
for (int32_t i = 0; i < sampleLength; i++)
smpDataPtr[i] = audioDataU8[i] - 128;
free(audioDataU8);
}
else if (bitsPerSample == 16) // 16-BIT INTEGER SAMPLE
{
sampleLength >>= 1;
if (sampleLength > config.maxSampleLength*4)
sampleLength = config.maxSampleLength*4;
int16_t *audioDataS16 = (int16_t *)malloc(sampleLength * sizeof (int16_t));
if (audioDataS16 == NULL)
{
statusOutOfMemory();
return false;
}
// read sample data
if (fread(audioDataS16, 2, sampleLength, f) != (size_t)sampleLength)
{
free(audioDataS16);
displayErrorMsg("I/O ERROR !");
return false;
}
// convert from stereo to mono (if needed)
if (numChannels == 2)
{
sampleLength >>= 1;
for (int32_t i = 0; i < sampleLength-1; i++) // add right channel to left channel
audioDataS16[i] = (audioDataS16[(i << 1) + 0] + audioDataS16[(i << 1) + 1]) >> 1;;
}
// 2x downsampling
if (downSample)
{
downsample2x16Bit(audioDataS16, sampleLength);
sampleLength >>= 1;
}
if (sampleLength > config.maxSampleLength)
sampleLength = config.maxSampleLength;
double dAmp = 1.0;
if (downSample) // we already normalized
{
dAmp = INT8_MAX / (double)INT16_MAX;
}
else
{
const double dPeak = get16BitPeak(audioDataS16, sampleLength);
if (dPeak > 0.0)
dAmp = INT8_MAX / dPeak;
}
turnOffVoices();
for (int32_t i = 0; i < sampleLength; i++)
{
int32_t smp32 = (int32_t)round(audioDataS16[i] * dAmp);
assert(smp32 >= -128 && smp32 <= 127); // shouldn't happen according to dAmp (but just in case)
smpDataPtr[i] = (int8_t)smp32;
}
free(audioDataS16);
}
else if (bitsPerSample == 24) // 24-BIT INTEGER SAMPLE
{
sampleLength /= 3;
if (sampleLength > config.maxSampleLength*4)
sampleLength = config.maxSampleLength*4;
int32_t *audioDataS32 = (int32_t *)malloc(sampleLength * sizeof (int32_t));
if (audioDataS32 == NULL)
{
statusOutOfMemory();
return false;
}
// read sample data
uint8_t *audioDataU8 = (uint8_t *)audioDataS32;
for (int32_t i = 0; i < sampleLength; i++)
{
audioDataU8[0] = 0;
fread(&audioDataU8[1], 3, 1, f);
audioDataU8 += sizeof (int32_t);
}
// convert from stereo to mono (if needed)
if (numChannels == 2)
{
sampleLength >>= 1;
for (int32_t i = 0; i < sampleLength-1; i++) // add right channel to left channel
{
int64_t smp = ((int64_t)audioDataS32[(i << 1) + 0] + audioDataS32[(i << 1) + 1]) >> 1;
audioDataS32[i] = (int32_t)smp;
}
}
// 2x downsampling
if (downSample)
{
downsample2x32Bit(audioDataS32, sampleLength);
sampleLength >>= 1;
}
if (sampleLength > config.maxSampleLength)
sampleLength = config.maxSampleLength;
double dAmp = 1.0;
if (downSample) // we already normalized
{
dAmp = INT8_MAX / (double)INT32_MAX;
}
else
{
const double dPeak = get32BitPeak(audioDataS32, sampleLength);
if (dPeak > 0.0)
dAmp = INT8_MAX / dPeak;
}
turnOffVoices();
for (int32_t i = 0; i < sampleLength; i++)
{
int32_t smp32 = (int32_t)round(audioDataS32[i] * dAmp);
assert(smp32 >= -128 && smp32 <= 127); // shouldn't happen according to dAmp (but just in case)
smpDataPtr[i] = (int8_t)smp32;
}
free(audioDataS32);
}
else if (audioFormat == WAV_FORMAT_PCM && bitsPerSample == 32) // 32-BIT INTEGER SAMPLE
{
sampleLength >>= 2;
if (sampleLength > config.maxSampleLength*4)
sampleLength = config.maxSampleLength*4;
int32_t *audioDataS32 = (int32_t *)malloc(sampleLength * sizeof (int32_t));
if (audioDataS32 == NULL)
{
statusOutOfMemory();
return false;
}
// read sample data
if (fread(audioDataS32, 4, sampleLength, f) != (size_t)sampleLength)
{
free(audioDataS32);
displayErrorMsg("I/O ERROR !");
return false;
}
// convert from stereo to mono (if needed)
if (numChannels == 2)
{
sampleLength >>= 1;
for (int32_t i = 0; i < sampleLength-1; i++) // add right channel to left channel
{
int64_t smp = ((int64_t)audioDataS32[(i << 1) + 0] + audioDataS32[(i << 1) + 1]) >> 1;
audioDataS32[i] = (int32_t)smp;
}
}
// 2x downsampling
if (downSample)
{
downsample2x32Bit(audioDataS32, sampleLength);
sampleLength >>= 1;
}
if (sampleLength > config.maxSampleLength)
sampleLength = config.maxSampleLength;
double dAmp = 1.0;
if (downSample) // we already normalized
{
dAmp = INT8_MAX / (double)INT32_MAX;
}
else
{
const double dPeak = get32BitPeak(audioDataS32, sampleLength);
if (dPeak > 0.0)
dAmp = INT8_MAX / dPeak;
}
turnOffVoices();
for (int32_t i = 0; i < sampleLength; i++)
{
int32_t smp32 = (int32_t)round(audioDataS32[i] * dAmp);
assert(smp32 >= -128 && smp32 <= 127); // shouldn't happen according to dAmp (but just in case)
smpDataPtr[i] = (int8_t)smp32;
}
free(audioDataS32);
}
else if (audioFormat == WAV_FORMAT_IEEE_FLOAT && bitsPerSample == 32) // 32-BIT FLOATING POINT SAMPLE
{
sampleLength >>= 2;
if (sampleLength > config.maxSampleLength*4)
sampleLength = config.maxSampleLength*4;
uint32_t *audioDataU32 = (uint32_t *)malloc(sampleLength * sizeof (uint32_t));
if (audioDataU32 == NULL)
{
statusOutOfMemory();
return false;
}
// read sample data
if (fread(audioDataU32, 4, sampleLength, f) != (size_t)sampleLength)
{
free(audioDataU32);
displayErrorMsg("I/O ERROR !");
return false;
}
float *fAudioDataFloat = (float *)audioDataU32;
// convert from stereo to mono (if needed)
if (numChannels == 2)
{
sampleLength >>= 1;
for (int32_t i = 0; i < sampleLength-1; i++) // add right channel to left channel
fAudioDataFloat[i] = (fAudioDataFloat[(i * 2) + 0] + fAudioDataFloat[(i * 2) + 1]) * 0.5f;
}
// 2x downsampling
if (downSample)
{
downsample2xFloat(fAudioDataFloat, sampleLength);
sampleLength >>= 1;
}
if (sampleLength > config.maxSampleLength)
sampleLength = config.maxSampleLength;
float fAmp = 1.0f;
const float fPeak = getFloatPeak(fAudioDataFloat, sampleLength);
if (fPeak > 0.0f)
fAmp = INT8_MAX / fPeak;
turnOffVoices();
for (int32_t i = 0; i < sampleLength; i++)
{
int32_t smp32 = (int32_t)roundf(fAudioDataFloat[i] * fAmp);
assert(smp32 >= -128 && smp32 <= 127); // shouldn't happen according to dAmp (but just in case)
smpDataPtr[i] = (int8_t)smp32;
}
free(audioDataU32);
}
else if (audioFormat == WAV_FORMAT_IEEE_FLOAT && bitsPerSample == 64) // 64-BIT FLOATING POINT SAMPLE
{
sampleLength >>= 3;
if (sampleLength > config.maxSampleLength*4)
sampleLength = config.maxSampleLength*4;
uint32_t *audioDataU32 = (uint32_t *)malloc(sampleLength * (sizeof (uint32_t) * 2));
if (audioDataU32 == NULL)
{
statusOutOfMemory();
return false;
}
// read sample data
if (fread(audioDataU32, 8, sampleLength, f) != (size_t)sampleLength)
{
free(audioDataU32);
displayErrorMsg("I/O ERROR !");
return false;
}
double *dAudioDataDouble = (double *)audioDataU32;
// convert from stereo to mono (if needed)
if (numChannels == 2)
{
sampleLength >>= 1;
for (int32_t i = 0; i < sampleLength-1; i++) // add right channel to left channel
dAudioDataDouble[i] = (dAudioDataDouble[(i * 2) + 0] + dAudioDataDouble[(i * 2) + 1]) * 0.5;
}
// 2x downsampling
if (downSample)
{
downsample2xDouble(dAudioDataDouble, sampleLength);
sampleLength >>= 1;
}
if (sampleLength > config.maxSampleLength)
sampleLength = config.maxSampleLength;
double dAmp = 1.0;
const double dPeak = getDoublePeak(dAudioDataDouble, sampleLength);
if (dPeak > 0.0)
dAmp = INT8_MAX / dPeak;
turnOffVoices();
for (int32_t i = 0; i < sampleLength; i++)
{
int32_t smp32 = (int32_t)round(dAudioDataDouble[i] * dAmp);
assert(smp32 >= -128 && smp32 <= 127); // shouldn't happen according to dAmp (but just in case)
smpDataPtr[i] = (int8_t)smp32;
}
free(audioDataU32);
}
if (sampleLength & 1)
{
if (++sampleLength > config.maxSampleLength)
sampleLength = config.maxSampleLength;
}
s->length = sampleLength;
s->fineTune = 0;
s->volume = 64;
s->loopStart = 0;
s->loopLength = 2;
// ---- READ "smpl" chunk ----
if (smplPtr != 0 && smplLen > 52)
{
int32_t loopStart, loopEnd;
uint32_t loopFlags;
fseek(f, smplPtr + 28, SEEK_SET); // seek to first wanted byte
fread(&loopFlags, 4, 1, f);
fseek(f, 12, SEEK_CUR);
fread(&loopStart, 4, 1, f);
fread(&loopEnd, 4, 1, f);
loopEnd++;
if (loopFlags) // loop enabled?
{
int32_t loopLength = loopEnd - loopStart;
if (downSample)
{
// we already downsampled 2x, so we're half the original length
loopStart >>= 1;
loopLength >>= 1;
}
loopStart &= ~1;
loopLength &= ~1;
if (loopLength < 2 || loopStart+loopLength >= s->length)
{
loopStart = 0;
loopLength = 2;
}
s->loopStart = loopStart;
s->loopLength = loopLength;
}
}
// ---------------------------
// ---- READ "xtra" chunk ----
if (xtraPtr != 0 && xtraLen >= 8)
{
uint16_t tempVol;
fseek(f, xtraPtr + 4, SEEK_SET); // seek to first wanted byte
// volume (0..256)
fseek(f, 2, SEEK_CUR);
fread(&tempVol, 2, 1, f);
if (tempVol > 256)
tempVol = 256;
tempVol >>= 2; // 0..256 -> 0..64
s->volume = (int8_t)tempVol;
}
// ---------------------------
// ---- READ "INAM" chunk ----
if (inamPtr != 0 && inamLen > 0)
{
fseek(f, inamPtr, SEEK_SET); // seek to first wanted byte
for (int32_t i = 0; i < 21; i++)
{
if (i < inamLen)
s->text[i] = (char)fgetc(f);
else
s->text[i] = '\0';
}
s->text[21] = '\0';
s->text[22] = '\0';
}
// ---------------------------
return true;
}