ref: 252fc5e9896155c03e4e8642092589c9b7e4fec3
dir: /src/smploaders/ft2_load_wav.c/
// WAV sample loader
#include <stdio.h>
#include <stdint.h>
#include <stdbool.h>
#include "../ft2_header.h"
#include "../ft2_audio.h"
#include "../ft2_sample_ed.h"
#include "../ft2_sysreqs.h"
#include "../ft2_sample_loader.h"
enum
{
WAV_FORMAT_PCM = 1,
WAV_FORMAT_IEEE_FLOAT = 3
};
static bool wavIsStereo(FILE *f);
bool loadWAV(FILE *f, uint32_t filesize)
{
uint8_t *audioDataU8;
int16_t *audioDataS16, *audioDataS16_2, *ptr16;
uint16_t audioFormat, numChannels, bitsPerSample;
int32_t *audioDataS32;
uint32_t i, sampleRate, sampleLength;
uint32_t len32;
float *fAudioDataFloat;
double *dAudioDataDouble;
if (filesize < 12)
{
loaderMsgBox("Error loading sample: The sample is not supported or is invalid!");
return false;
}
uint32_t fmtPtr = 0, fmtLen = 0;
uint32_t dataPtr = 0, dataLen = 0;
uint32_t inamPtr = 0, inamLen = 0;
uint32_t xtraPtr = 0, xtraLen = 0;
uint32_t smplPtr = 0, smplLen = 0;
// look for wanted chunks and set up pointers + lengths
fseek(f, 12, SEEK_SET);
uint32_t bytesRead = 0;
while (!feof(f) && bytesRead < 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)
{
loaderMsgBox("Error loading sample: The sample is not supported or is invalid!");
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); // unneeded
fread(&bitsPerSample, 2, 1, f);
sampleLength = dataLen;
// ---------------------------
// test if the WAV is compatible with our loader
if (sampleRate == 0 || sampleLength == 0 || sampleLength >= filesize)
{
loaderMsgBox("Error loading sample: The sample is not supported or is invalid!");
return false;
}
if (audioFormat != WAV_FORMAT_PCM && audioFormat != WAV_FORMAT_IEEE_FLOAT)
{
loaderMsgBox("Error loading sample: The sample is not supported!");
return false;
}
if (numChannels == 0 || numChannels > 2)
{
loaderMsgBox("Error loading sample: Unsupported number of channels!");
return false;
}
if (audioFormat == WAV_FORMAT_IEEE_FLOAT && bitsPerSample != 32 && bitsPerSample != 64)
{
loaderMsgBox("Error loading sample: Unsupported bitdepth!");
return false;
}
if (bitsPerSample != 8 && bitsPerSample != 16 && bitsPerSample != 24 && bitsPerSample != 32 && bitsPerSample != 64)
{
loaderMsgBox("Error loading sample: Unsupported bitdepth!");
return false;
}
// ---- READ SAMPLE DATA ----
fseek(f, dataPtr, SEEK_SET);
if (sampleLength > MAX_SAMPLE_LEN)
sampleLength = MAX_SAMPLE_LEN;
int16_t stereoSampleLoadMode = -1;
if (wavIsStereo(f))
stereoSampleLoadMode = loaderSysReq(5, "System request", "This is a stereo sample...");
if (bitsPerSample == 8) // 8-BIT INTEGER SAMPLE
{
if (!allocateTmpSmpData(&tmpSmp, sampleLength))
{
loaderMsgBox("Not enough memory!");
return false;
}
if (fread(tmpSmp.pek, sampleLength, 1, f) != 1)
{
loaderMsgBox("General I/O error during loading! Is the file in use?");
return false;
}
audioDataU8 = (uint8_t *)tmpSmp.pek;
// stereo conversion
if (numChannels == 2)
{
sampleLength /= 2;
switch (stereoSampleLoadMode)
{
case STEREO_SAMPLE_READ_LEFT:
{
// remove right channel data
for (i = 1; i < sampleLength; i++)
audioDataU8[i] = audioDataU8[(i * 2) + 0];
}
break;
case STEREO_SAMPLE_READ_RIGHT:
{
// remove left channel data
len32 = sampleLength - 1;
for (i = 0; i < len32; i++)
audioDataU8[i] = audioDataU8[(i * 2) + 1];
audioDataU8[i] = 128;
}
break;
default:
case STEREO_SAMPLE_CONVERT:
{
// mix stereo to mono
len32 = sampleLength - 1;
for (i = 0; i < len32; i++)
audioDataU8[i] = (audioDataU8[(i * 2) + 0] + audioDataU8[(i * 2) + 1]) >> 1;
audioDataU8[i] = 128;
}
break;
}
}
// convert from unsigned to signed
for (i = 0; i < sampleLength; i++)
tmpSmp.pek[i] ^= 0x80;
}
else if (bitsPerSample == 16) // 16-BIT INTEGER SAMPLE
{
sampleLength /= 2;
if (!allocateTmpSmpData(&tmpSmp, sampleLength*2))
{
loaderMsgBox("Not enough memory!");
return false;
}
if (fread(tmpSmp.pek, sampleLength, 2, f) != 2)
{
loaderMsgBox("General I/O error during loading! Is the file in use?");
return false;
}
audioDataS16 = (int16_t *)tmpSmp.pek;
// stereo conversion
if (numChannels == 2)
{
sampleLength /= 2;
switch (stereoSampleLoadMode)
{
case STEREO_SAMPLE_READ_LEFT:
{
// remove right channel data
for (i = 1; i < sampleLength; i++)
audioDataS16[i] = audioDataS16[(i * 2) + 0];
}
break;
case STEREO_SAMPLE_READ_RIGHT:
{
// remove left channel data
len32 = sampleLength - 1;
for (i = 0; i < len32; i++)
audioDataS16[i] = audioDataS16[(i * 2) + 1];
audioDataS16[i] = 0;
}
break;
default:
case STEREO_SAMPLE_CONVERT:
{
// mix stereo to mono
len32 = sampleLength - 1;
for (i = 0; i < len32; i++)
{
int32_t smp32 = audioDataS16[(i * 2) + 0] + audioDataS16[(i * 2) + 1];
audioDataS16[i] = (int16_t)(smp32 >> 1);
}
audioDataS16[i] = 0;
}
break;
}
}
sampleLength *= 2;
tmpSmp.typ |= 16; // 16-bit
}
else if (bitsPerSample == 24) // 24-BIT INTEGER SAMPLE
{
sampleLength /= 3;
if (!allocateTmpSmpData(&tmpSmp, (sampleLength * 4) * 2))
{
loaderMsgBox("Not enough memory!");
return false;
}
if (fread(&tmpSmp.pek[sampleLength], sampleLength, 3, f) != 3)
{
loaderMsgBox("General I/O error during loading! Is the file in use?");
return false;
}
audioDataS32 = (int32_t *)tmpSmp.pek;
// convert to 32-bit
audioDataU8 = (uint8_t *)tmpSmp.pek + sampleLength;
for (i = 0; i < sampleLength; i++)
{
audioDataS32[i] = (audioDataU8[2] << 24) | (audioDataU8[1] << 16) | (audioDataU8[0] << 8);
audioDataU8 += 3;
}
// stereo conversion
if (numChannels == 2)
{
sampleLength /= 2;
switch (stereoSampleLoadMode)
{
case STEREO_SAMPLE_READ_LEFT:
{
// remove right channel data
for (i = 1; i < sampleLength; i++)
audioDataS32[i] = audioDataS32[(i * 2) + 0];
}
break;
case STEREO_SAMPLE_READ_RIGHT:
{
// remove left channel data
len32 = sampleLength - 1;
for (i = 0; i < len32; i++)
audioDataS32[i] = audioDataS32[(i * 2) + 1];
audioDataS32[i] = 0;
}
break;
default:
case STEREO_SAMPLE_CONVERT:
{
// mix stereo to mono
len32 = sampleLength - 1;
for (i = 0; i < len32; i++)
{
int64_t smp64 = audioDataS32[(i * 2) + 0];
smp64 += audioDataS32[(i * 2) + 1];
smp64 >>= 1;
audioDataS32[i] = (int32_t)smp64;
}
audioDataS32[i] = 0;
}
break;
}
}
normalizeSigned32Bit(audioDataS32, sampleLength);
// downscale to 16-bit (ultra fast method!)
audioDataS16 = (int16_t *)tmpSmp.pek;
audioDataS16_2 = (int16_t *)tmpSmp.pek + 1; // yes, this is aligned to words
for (i = 0; i < sampleLength; i++, audioDataS16_2++)
audioDataS16[i] = audioDataS16_2[i];
sampleLength *= 2;
tmpSmp.typ |= 16; // 16-bit
}
else if (audioFormat == WAV_FORMAT_PCM && bitsPerSample == 32) // 32-BIT INTEGER SAMPLE
{
sampleLength /= 4;
if (!allocateTmpSmpData(&tmpSmp, sampleLength * 4))
{
loaderMsgBox("Not enough memory!");
return false;
}
if (fread(tmpSmp.pek, sampleLength, 4, f) != 4)
{
loaderMsgBox("General I/O error during loading! Is the file in use?");
return false;
}
audioDataS32 = (int32_t *)tmpSmp.pek;
// stereo conversion
if (numChannels == 2)
{
sampleLength /= 2;
switch (stereoSampleLoadMode)
{
case STEREO_SAMPLE_READ_LEFT:
{
// remove right channel data
for (i = 1; i < sampleLength; i++)
audioDataS32[i] = audioDataS32[(i * 2) + 0];
}
break;
case STEREO_SAMPLE_READ_RIGHT:
{
// remove left channel data
len32 = sampleLength - 1;
for (i = 0; i < len32; i++)
audioDataS32[i] = audioDataS32[(i * 2) + 1];
audioDataS32[i] = 0;
}
break;
default:
case STEREO_SAMPLE_CONVERT:
{
// mix stereo to mono
len32 = sampleLength - 1;
for (i = 0; i < len32; i++)
{
int64_t smp64 = audioDataS32[(i * 2) + 0];
smp64 += audioDataS32[(i * 2) + 1];
smp64 >>= 1;
audioDataS32[i] = (int32_t)smp64;
}
audioDataS32[i] = 0;
}
break;
}
}
normalizeSigned32Bit(audioDataS32, sampleLength);
// downscale to 16-bit (ultra fast method!)
audioDataS16 = (int16_t *)tmpSmp.pek;
audioDataS16_2 = (int16_t *)tmpSmp.pek + 1; // yes, this is aligned to words
for (i = 0; i < sampleLength; i++, audioDataS16_2++)
audioDataS16[i] = audioDataS16_2[i];
sampleLength *= 2;
tmpSmp.typ |= 16; // 16-bit
}
else if (audioFormat == WAV_FORMAT_IEEE_FLOAT && bitsPerSample == 32) // 32-BIT FLOATING POINT SAMPLE
{
sampleLength /= 4;
if (!allocateTmpSmpData(&tmpSmp, sampleLength * 4))
{
loaderMsgBox("Not enough memory!");
return false;
}
if (fread(tmpSmp.pek, sampleLength, 4, f) != 4)
{
loaderMsgBox("General I/O error during loading! Is the file in use?");
return false;
}
fAudioDataFloat = (float *)tmpSmp.pek;
// stereo conversion
if (numChannels == 2)
{
sampleLength /= 2;
switch (stereoSampleLoadMode)
{
case STEREO_SAMPLE_READ_LEFT:
{
// remove right channel data
for (i = 1; i < sampleLength; i++)
fAudioDataFloat[i] = fAudioDataFloat[(i * 2) + 0];
}
break;
case STEREO_SAMPLE_READ_RIGHT:
{
// remove left channel data
len32 = sampleLength - 1;
for (i = 0; i < len32; i++)
fAudioDataFloat[i] = fAudioDataFloat[(i * 2) + 1];
fAudioDataFloat[i] = 0.0f;
}
break;
default:
case STEREO_SAMPLE_CONVERT:
{
// mix stereo to mono
len32 = sampleLength - 1;
for (i = 0; i < len32; i++)
fAudioDataFloat[i] = (fAudioDataFloat[(i * 2) + 0] + fAudioDataFloat[(i * 2) + 1]) * 0.5f;
fAudioDataFloat[i] = 0.0f;
}
break;
}
}
normalize32BitFloatToSigned16Bit(fAudioDataFloat, sampleLength);
ptr16 = (int16_t *)tmpSmp.pek;
for (i = 0; i < sampleLength; i++)
ptr16[i] = (int16_t)fAudioDataFloat[i]; // should use SIMD if available
sampleLength *= 2;
tmpSmp.typ |= 16; // 16-bit
}
else if (audioFormat == WAV_FORMAT_IEEE_FLOAT && bitsPerSample == 64) // 64-BIT FLOATING POINT SAMPLE
{
sampleLength /= 8;
if (!allocateTmpSmpData(&tmpSmp, sampleLength * 8))
{
loaderMsgBox("Not enough memory!");
return false;
}
if (fread(tmpSmp.pek, sampleLength, 8, f) != 8)
{
loaderMsgBox("General I/O error during loading! Is the file in use?");
return false;
}
dAudioDataDouble = (double *)tmpSmp.pek;
// stereo conversion
if (numChannels == 2)
{
sampleLength /= 2;
switch (stereoSampleLoadMode)
{
case STEREO_SAMPLE_READ_LEFT:
{
// remove right channel data
for (i = 1; i < sampleLength; i++)
dAudioDataDouble[i] = dAudioDataDouble[(i * 2) + 0];
}
break;
case STEREO_SAMPLE_READ_RIGHT:
{
// remove left channel data
len32 = sampleLength - 1;
for (i = 0; i < len32; i++)
dAudioDataDouble[i] = dAudioDataDouble[(i * 2) + 1];
dAudioDataDouble[i] = 0.0;
}
break;
default:
case STEREO_SAMPLE_CONVERT:
{
// mix stereo to mono
len32 = sampleLength - 1;
for (i = 0; i < len32; i++)
dAudioDataDouble[i] = (dAudioDataDouble[(i * 2) + 0] + dAudioDataDouble[(i * 2) + 1]) * 0.5;
dAudioDataDouble[i] = 0.0;
}
break;
}
}
normalize64BitFloatToSigned16Bit(dAudioDataDouble, sampleLength);
ptr16 = (int16_t *)tmpSmp.pek;
for (i = 0; i < sampleLength; i++)
ptr16[i] = (int16_t)dAudioDataDouble[i]; // should use SIMD if available
sampleLength *= 2;
tmpSmp.typ |= 16; // 16-bit
}
reallocateTmpSmpData(&tmpSmp, sampleLength); // readjust memory needed
tuneSample(&tmpSmp, sampleRate, audio.linearPeriodsFlag);
tmpSmp.vol = 64;
tmpSmp.pan = 128;
tmpSmp.len = sampleLength;
// ---- READ "smpl" chunk ----
if (smplPtr != 0 && smplLen > 52)
{
uint32_t numLoops, loopType, loopStart, loopEnd;
fseek(f, smplPtr+28, SEEK_SET); // seek to first wanted byte
fread(&numLoops, 4, 1, f);
if (numLoops == 1)
{
fseek(f, 4+4, SEEK_CUR); // skip "samplerData" and "identifier"
fread(&loopType, 4, 1, f);
fread(&loopStart, 4, 1, f);
fread(&loopEnd, 4, 1, f); loopEnd++;
if (tmpSmp.typ & 16)
{
loopStart *= 2;
loopEnd *= 2;
}
if (loopEnd <= sampleLength)
{
tmpSmp.repS = loopStart;
tmpSmp.repL = loopEnd - loopStart;
tmpSmp.typ |= (loopType == 0) ? 1 : 2;
}
}
}
// ---------------------------
// ---- READ "xtra" chunk ----
if (xtraPtr != 0 && xtraLen >= 8)
{
uint16_t tmpPan, tmpVol;
uint32_t xtraFlags;
fseek(f, xtraPtr, SEEK_SET);
fread(&xtraFlags, 4, 1, f); // flags
// panning (0..256)
if (xtraFlags & 0x20) // set panning flag
{
fread(&tmpPan, 2, 1, f);
if (tmpPan > 255)
tmpPan = 255;
tmpSmp.pan = (uint8_t)tmpPan;
}
else
{
// don't read panning, skip it
fseek(f, 2, SEEK_CUR);
}
// volume (0..256)
fread(&tmpVol, 2, 1, f);
if (tmpVol > 256)
tmpVol = 256;
tmpSmp.vol = (uint8_t)((tmpVol + 2) / 4); // 0..256 -> 0..64 (rounded)
}
// ---------------------------
// ---- READ "INAM" chunk ----
if (inamPtr != 0 && inamLen > 0)
{
fseek(f, inamPtr, SEEK_SET);
uint32_t len = 22;
if (len > inamLen)
len = inamLen;
memset(tmpSmp.name, 0, sizeof (tmpSmp.name));
for (i = 0; i < len; i++)
{
char chr = (char)fgetc(f);
if (chr == '\0')
break;
tmpSmp.name[i] = chr;
}
smpFilenameSet = true;
}
return true;
}
static bool wavIsStereo(FILE *f)
{
uint16_t numChannels;
uint32_t chunkID, chunkSize;
uint32_t oldPos = ftell(f);
fseek(f, 0, SEEK_END);
int32_t filesize = ftell(f);
if (filesize < 12)
{
fseek(f, oldPos, SEEK_SET);
return false;
}
fseek(f, 12, SEEK_SET);
uint32_t fmtPtr = 0;
uint32_t fmtLen = 0;
int32_t bytesRead = 0;
while (!feof(f) && bytesRead < filesize-12)
{
fread(&chunkID, 4, 1, f); if (feof(f)) break;
fread(&chunkSize, 4, 1, f); if (feof(f)) break;
int32_t endOfChunk = (ftell(f) + chunkSize) + (chunkSize & 1);
switch (chunkID)
{
case 0x20746D66: // "fmt "
{
fmtPtr = ftell(f);
fmtLen = chunkSize;
}
break;
default: break;
}
bytesRead += (chunkSize + (chunkSize & 1));
fseek(f, endOfChunk, SEEK_SET);
}
if (fmtPtr == 0 || fmtLen < 4)
{
fseek(f, oldPos, SEEK_SET);
return false;
}
fseek(f, fmtPtr + 2, SEEK_SET);
fread(&numChannels, 2, 1, f);
fseek(f, oldPos, SEEK_SET);
return (numChannels == 2);
}