ref: f4ba52e6835e5935ad294b7dbbfbce3fc36d40c1
dir: /src/smploaders/pt2_load_flac.c/
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <stdbool.h>
#include <math.h>
#ifndef _WIN32
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#endif
#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"
#ifdef HAS_LIBFLAC
// hide POSIX warning for fileno()
#ifdef _MSC_VER
#pragma warning(disable: 4996)
#endif
#ifdef EXTERNAL_LIBFLAC
#include <FLAC/stream_decoder.h>
#else
#include "../libflac/FLAC/stream_decoder.h"
#endif
static bool loopEnabled;
static int8_t *smpBuf8;
static int16_t *smpBuf16;
static int32_t *smpBuf24, sampleLength, loopStart, loopLength;
static uint32_t numChannels, bitDepth, sampleRate, samplesRead;
static moduleSample_t *smp;
static FLAC__StreamDecoderReadStatus read_callback(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], size_t *bytes, void *client_data);
static FLAC__StreamDecoderSeekStatus seek_callback(const FLAC__StreamDecoder *decoder, FLAC__uint64 absolute_byte_offset, void *client_data);
static FLAC__StreamDecoderTellStatus tell_callback(const FLAC__StreamDecoder *decoder, FLAC__uint64 *absolute_byte_offset, void *client_data);
static FLAC__StreamDecoderLengthStatus length_callback(const FLAC__StreamDecoder *decoder, FLAC__uint64 *stream_length, void *client_data);
static FLAC__bool eof_callback(const FLAC__StreamDecoder *decoder, void *client_data);
static void metadata_callback(const FLAC__StreamDecoder *decoder, const FLAC__StreamMetadata *metadata, void *client_data);
static FLAC__StreamDecoderWriteStatus write_callback(const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 *const buffer[], void *client_data);
static void error_callback(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data);
bool loadFLACSample(FILE *f, uint32_t filesize, moduleSample_t *s)
{
FLAC__StreamDecoder *decoder = FLAC__stream_decoder_new();
if (decoder == NULL)
{
displayErrorMsg("FLAC LOAD ERROR !");
goto error;
}
FLAC__stream_decoder_set_metadata_respond_all(decoder);
FLAC__StreamDecoderInitStatus initStatus =
FLAC__stream_decoder_init_stream
(
decoder,
read_callback, seek_callback,
tell_callback, length_callback,
eof_callback, write_callback,
metadata_callback, error_callback,
f
);
if (initStatus != FLAC__STREAM_DECODER_INIT_STATUS_OK)
{
displayErrorMsg("FLAC LOAD ERROR !");
goto error;
}
smp = s;
s->volume = 64;
loopStart = 0;
loopLength = 2;
smpBuf8 = NULL;
smpBuf16 = NULL;
smpBuf24 = NULL;
FLAC__stream_decoder_process_until_end_of_stream(decoder);
FLAC__stream_decoder_finish(decoder);
FLAC__stream_decoder_delete(decoder);
// sample has been read to smpBufX now (depending on bitdepth)
bool downSample = false;
if (sampleRate > 22050 && !config.noDownsampleOnSmpLoad)
{
if (askBox(ASKBOX_DOWNSAMPLE, "DOWNSAMPLE ?"))
downSample = true;
}
int8_t *smpDataPtr = &song->sampleData[s->offset];
if (bitDepth == 8)
{
if (downSample)
{
if (!downsample2x8Bit(smpBuf8, sampleLength))
{
statusOutOfMemory();
goto error;
}
sampleLength /= 2;
}
turnOffVoices();
memcpy(smpDataPtr, smpBuf8, sampleLength * sizeof (int8_t));
free(smpBuf8);
}
else if (bitDepth == 16)
{
if (downSample)
{
if (!downsample2x16Bit(smpBuf16, sampleLength))
{
statusOutOfMemory();
goto error;
}
sampleLength /= 2;
}
double dAmp = 1.0;
if (downSample) // we already normalized
{
dAmp = INT8_MAX / (double)INT16_MAX;
}
else
{
const double dPeak = get16BitPeak(smpBuf16, sampleLength);
if (dPeak > 0.0)
dAmp = INT8_MAX / dPeak;
}
turnOffVoices();
for (int32_t i = 0; i < sampleLength; i++)
{
int32_t smp32 = (int32_t)round(smpBuf16[i] * dAmp);
assert(smp32 >= -128 && smp32 <= 127); // shouldn't happen according to dAmp (but just in case)
smpDataPtr[i] = (int8_t)smp32;
}
free(smpBuf16);
}
else if (bitDepth == 24)
{
if (downSample)
{
if (!downsample2x32Bit(smpBuf24, sampleLength))
{
statusOutOfMemory();
goto error;
}
sampleLength /= 2;
}
double dAmp = 1.0;
if (downSample) // we already normalized
{
dAmp = INT8_MAX / (double)INT32_MAX;
}
else
{
const double dPeak = get32BitPeak(smpBuf24, sampleLength);
if (dPeak > 0.0)
dAmp = INT8_MAX / dPeak;
}
turnOffVoices();
for (int32_t i = 0; i < sampleLength; i++)
{
int32_t smp32 = (int32_t)round(smpBuf24[i] * dAmp);
assert(smp32 >= -128 && smp32 <= 127); // shouldn't happen according to dAmp (but just in case)
smpDataPtr[i] = (int8_t)smp32;
}
free(smpBuf24);
}
if (sampleLength & 1)
{
if (++sampleLength > config.maxSampleLength)
sampleLength = config.maxSampleLength;
}
if (downSample)
{
loopStart /= 2;
loopLength /= 2;
}
loopStart &= ~1;
loopLength &= ~1;
if (loopLength < 2 || loopStart+loopLength > sampleLength)
{
loopStart = 0;
loopLength = 2;
}
s->fineTune = 0;
s->loopStart = loopStart;
s->loopLength = loopLength;
s->length = sampleLength;
return true;
error:
if (smpBuf8 != NULL) free(smpBuf8);
if (smpBuf16 != NULL) free(smpBuf16);
if (smpBuf24 != NULL) free(smpBuf24);
if (decoder != NULL) FLAC__stream_decoder_delete(decoder);
return false;
(void)filesize;
}
static FLAC__StreamDecoderReadStatus read_callback(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], size_t *bytes, void *client_data)
{
FILE *file = (FILE *)client_data;
if (*bytes > 0)
{
*bytes = fread(buffer, sizeof (FLAC__byte), *bytes, file);
if (ferror(file))
return FLAC__STREAM_DECODER_READ_STATUS_ABORT;
else if (*bytes == 0)
return FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM;
else
return FLAC__STREAM_DECODER_READ_STATUS_CONTINUE;
}
else
{
return FLAC__STREAM_DECODER_READ_STATUS_ABORT;
}
(void)decoder;
}
static FLAC__StreamDecoderSeekStatus seek_callback(const FLAC__StreamDecoder *decoder, FLAC__uint64 absolute_byte_offset, void *client_data)
{
FILE *file = (FILE *)client_data;
if (absolute_byte_offset > INT32_MAX)
return FLAC__STREAM_DECODER_SEEK_STATUS_ERROR;
if (fseek(file, (int32_t)absolute_byte_offset, SEEK_SET) < 0)
return FLAC__STREAM_DECODER_SEEK_STATUS_ERROR;
else
return FLAC__STREAM_DECODER_SEEK_STATUS_OK;
(void)decoder;
}
static FLAC__StreamDecoderTellStatus tell_callback(const FLAC__StreamDecoder *decoder, FLAC__uint64 *absolute_byte_offset, void *client_data)
{
FILE *file = (FILE *)client_data;
int32_t pos = ftell(file);
if (pos < 0)
{
return FLAC__STREAM_DECODER_TELL_STATUS_ERROR;
}
else
{
*absolute_byte_offset = (FLAC__uint64)pos;
return FLAC__STREAM_DECODER_TELL_STATUS_OK;
}
(void)decoder;
}
static FLAC__StreamDecoderLengthStatus length_callback(const FLAC__StreamDecoder *decoder, FLAC__uint64 *stream_length, void *client_data)
{
FILE *file = (FILE *)client_data;
struct stat filestats;
if (fstat(fileno(file), &filestats) != 0)
{
return FLAC__STREAM_DECODER_LENGTH_STATUS_ERROR;
}
else
{
*stream_length = (FLAC__uint64)filestats.st_size;
return FLAC__STREAM_DECODER_LENGTH_STATUS_OK;
}
(void)decoder;
}
static FLAC__bool eof_callback(const FLAC__StreamDecoder *decoder, void *client_data)
{
FILE *file = (FILE *)client_data;
return feof(file) ? true : false;
(void)decoder;
}
static void metadata_callback(const FLAC__StreamDecoder *decoder, const FLAC__StreamMetadata *metadata, void *client_data)
{
if (metadata->type == FLAC__METADATA_TYPE_STREAMINFO && metadata->data.stream_info.total_samples != 0)
{
bitDepth = metadata->data.stream_info.bits_per_sample;
numChannels = metadata->data.stream_info.channels;
sampleRate = metadata->data.stream_info.sample_rate;
int64_t tmp64 = metadata->data.stream_info.total_samples;
if (tmp64 > config.maxSampleLength*2)
tmp64 = config.maxSampleLength*2;
sampleLength = (int32_t)tmp64;
if (bitDepth == 8)
smpBuf8 = (int8_t *)calloc(1, config.maxSampleLength * 2 * sizeof (int8_t));
else if (bitDepth == 16)
smpBuf16 = (int16_t *)calloc(1, config.maxSampleLength * 2 * sizeof (int16_t));
else if (bitDepth == 24)
smpBuf24 = (int32_t *)calloc(1, config.maxSampleLength * 2 * sizeof (int32_t));
// alloc result is tasted later
}
// check for RIFF chunks (loop/vol/pan information)
else if (metadata->type == FLAC__METADATA_TYPE_APPLICATION && !memcmp(metadata->data.application.id, "riff", 4))
{
const uint8_t *data = (const uint8_t *)metadata->data.application.data;
uint32_t chunkID = *(uint32_t *)data; data += 4;
uint32_t chunkLen = *(uint32_t *)data; data += 4;
if (chunkID == 0x61727478 && chunkLen >= 8) // "xtra"
{
data += 6;
// volume (0..256)
uint16_t tmpVol = *(uint16_t *)data;
if (tmpVol > 256)
tmpVol = 256;
smp->volume = (uint8_t)((tmpVol + 2) / 4); // 0..256 -> 0..64 (rounded)
}
if (chunkID == 0x6C706D73 && chunkLen > 52) // "smpl"
{
data += 28; // seek to first wanted byte
uint32_t numLoops = *(uint32_t *)data; data += 4;
if (numLoops == 1)
{
data += 4+4; // skip "samplerData" and "identifier"
uint32_t loopType = *(uint32_t *)data; data += 4;
loopStart = *(uint32_t *)data; data += 4;
uint32_t loopEnd = *(uint32_t *)data; data += 4;
loopLength = (loopEnd+1) - loopStart;
loopEnabled = (loopType == 0);
}
}
}
else if (metadata->type == FLAC__METADATA_TYPE_VORBIS_COMMENT)
{
uint32_t tmpSampleRate = 0;
for (uint32_t i = 0; i < metadata->data.vorbis_comment.num_comments; i++)
{
const char *tag = (const char *)metadata->data.vorbis_comment.comments[i].entry;
uint32_t length = metadata->data.vorbis_comment.comments[i].length;
if (length > 6 && !memcmp(tag, "TITLE=", 6))
{
length -= 6;
if (length > 22)
length = 22;
memcpy(smp->text, &tag[6], length);
smp->text[22] = '\0';
}
// the following tags haven't been tested!
else if (length > 11 && !memcmp(tag, "SAMPLERATE=", 11))
{
tmpSampleRate = atoi(&tag[11]);
}
else if (length > 10 && !memcmp(tag, "LOOPSTART=", 10))
{
loopStart = atoi(&tag[10]);
}
else if (length > 11 && !memcmp(tag, "LOOPLENGTH=", 11))
{
loopLength = atoi(&tag[11]);
}
if (tmpSampleRate > 0)
sampleRate = tmpSampleRate;
}
}
(void)client_data;
(void)decoder;
}
static FLAC__StreamDecoderWriteStatus write_callback(const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 *const buffer[], void *client_data)
{
if (sampleLength == 0 || numChannels == 0)
{
displayErrorMsg("FLAC LOAD ERROR !");
return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
}
if (numChannels > 2)
{
displayErrorMsg("UNSUPPORTED FLAC !");
return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
}
if (bitDepth != 8 && bitDepth != 16 && bitDepth != 24)
{
displayErrorMsg("UNSUPPORTED FLAC !");
return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
}
if ((bitDepth == 8 && smpBuf8 == NULL) || (bitDepth == 16 && smpBuf16 == NULL) || (bitDepth == 24 && smpBuf24 == NULL))
{
statusOutOfMemory();
return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
}
if (frame->header.number.sample_number == 0)
samplesRead = 0;
uint32_t blockSize = frame->header.blocksize;
bool doAbort = false;
const uint32_t samplesAllocated = config.maxSampleLength * 2;
if (samplesRead+blockSize >= samplesAllocated)
{
blockSize = samplesAllocated-samplesRead;
doAbort = true;
}
if (blockSize > 0)
{
if (numChannels == 2) // mix to mono
{
const int32_t *src_L = buffer[0];
const int32_t *src_R = buffer[1];
if (bitDepth == 8)
{
int8_t *dst8 = smpBuf8 + samplesRead;
for (uint32_t i = 0; i < blockSize; i++)
dst8[i] = (int8_t)((src_L[i] + src_R[i]) >> 1);
}
else if (bitDepth == 16)
{
int16_t *dst16 = smpBuf16 + samplesRead;
for (uint32_t i = 0; i < blockSize; i++)
dst16[i] = (int16_t)((src_L[i] + src_R[i]) >> 1);
}
else if (bitDepth == 24)
{
int32_t *dst24 = smpBuf24 + samplesRead;
for (uint32_t i = 0; i < blockSize; i++)
dst24[i] = (int32_t)((src_L[i] + src_R[i]) >> 1);
}
}
else // mono sample
{
const int32_t *src = buffer[0];
if (bitDepth == 8)
{
int8_t *dst8 = smpBuf8 + samplesRead;
for (uint32_t i = 0; i < blockSize; i++)
dst8[i] = (int8_t)src[i];
}
else if (bitDepth == 16)
{
int16_t *dst16 = smpBuf16 + samplesRead;
for (uint32_t i = 0; i < blockSize; i++)
dst16[i] = (int16_t)src[i];
}
else if (bitDepth == 24)
{
int32_t *dst24 = smpBuf24 + samplesRead;
for (uint32_t i = 0; i < blockSize; i++)
dst24[i] = (int32_t)src[i];
}
}
samplesRead += blockSize;
}
if (doAbort)
return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
(void)client_data;
(void)decoder;
}
static void error_callback(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data)
{
(void)status;
(void)decoder;
(void)client_data;
}
#else
bool loadFLACSample(FILE *f, int32_t filesize, moduleSample_t *s)
{
displayErrorMsg("NO FLAC SUPPORT !");
return false;
(void)f;
(void)filesize;
(void)s;
}
#endif