ref: 77e70eb42d0b3b7430fba684c9f024fdcc0ff9ce
dir: /src/smploaders/ft2_load_flac.c/
/* FLAC sample loader
**
** Note: Vol/loop sanitation is done in the last stage
** of sample loading, so you don't need to do that here.
** Do NOT close the file handle!
*/
#ifdef HAS_LIBFLAC
// hide POSIX warning for fileno()
#ifdef _MSC_VER
#pragma warning(disable: 4996)
#endif
#include <stdio.h>
#include <stdint.h>
#include <stdbool.h>
#ifndef _WIN32
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#endif
#include "../ft2_header.h"
#include "../ft2_audio.h"
#include "../ft2_sample_ed.h"
#include "../ft2_sysreqs.h"
#include "../ft2_sample_loader.h"
#ifdef EXTERNAL_LIBFLAC
#include <FLAC/stream_decoder.h>
#else
#include "../libflac/FLAC/stream_decoder.h"
#endif
static bool sample16Bit;
static int16_t stereoSampleLoadMode = -1;
static uint32_t numChannels, bitDepth, sampleLength, sampleRate, samplesRead;
static sample_t *s;
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 loadFLAC(FILE *f, uint32_t filesize)
{
s = &tmpSmp;
s->volume = 64;
s->panning = 128;
numChannels = 0;
bitDepth = 0;
sampleLength = 0;
sampleRate = 0;
samplesRead = 0;
FLAC__StreamDecoder *decoder = FLAC__stream_decoder_new();
if (decoder == NULL)
{
loaderMsgBox("Error loading sample: Unable to allocate FLAC decoder!");
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)
{
loaderMsgBox("Error loading sample: Unable to initialize FLAC decoder!");
goto error;
}
if (!FLAC__stream_decoder_process_until_end_of_stream(decoder))
{
loaderMsgBox("Error loading sample: Unable to decode FLAC!");
goto error;
}
FLAC__stream_decoder_finish(decoder);
FLAC__stream_decoder_delete(decoder);
tuneSample(s, sampleRate, audio.linearPeriodsFlag);
return true;
error:
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;
sample16Bit = (bitDepth != 8);
int64_t tmp64 = metadata->data.stream_info.total_samples;
if (tmp64 > MAX_SAMPLE_LEN)
tmp64 = MAX_SAMPLE_LEN;
sampleLength = (uint32_t)tmp64;
s->length = sampleLength;
if (sample16Bit)
s->flags |= SAMPLE_16BIT;
stereoSampleLoadMode = -1;
if (numChannels == 2)
stereoSampleLoadMode = loaderSysReq(5, "System request", "This is a stereo sample...");
}
// 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"
{
uint32_t xtraFlags = *(uint32_t *)data; data += 4;
// panning (0..256)
if (xtraFlags & 0x20) // set panning flag
{
uint16_t tmpPan = *(uint16_t *)data;
if (tmpPan > 255)
tmpPan = 255;
s->panning = (uint8_t)tmpPan;
}
data += 2;
// volume (0..256)
uint16_t tmpVol = *(uint16_t *)data;
if (tmpVol > 256)
tmpVol = 256;
s->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;
uint32_t loopStart = *(uint32_t *)data; data += 4;
uint32_t loopEnd = *(uint32_t *)data; data += 4;
s->loopStart = loopStart;
s->loopLength = (loopEnd+1) - loopStart;
s->flags |= (loopType == 0) ? LOOP_FWD : LOOP_BIDI;
}
}
}
else if (metadata->type == FLAC__METADATA_TYPE_VORBIS_COMMENT)
{
uint32_t tmpSampleRate = 0, loopStart = 0, loopLength = 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(s->name, &tag[6], length);
s->name[22] = '\0';
smpFilenameSet = true;
}
// 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 (loopLength > 0)
{
s->loopStart = loopStart;
s->loopLength = loopLength;
DISABLE_LOOP(s->flags);
s->flags |= LOOP_FWD;
}
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)
{
loaderMsgBox("Error loading sample: The sample is empty or corrupt!");
return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
}
if (numChannels > 2)
{
loaderMsgBox("Error loading sample: Only mono/stereo FLACs are supported!");
return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
}
if (bitDepth != 8 && bitDepth != 16 && bitDepth != 24)
{
loaderMsgBox("Error loading sample: Only FLACs with a bitdepth of 8/16/24 are supported!");
return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
}
if (frame->header.number.sample_number == 0)
{
if (!allocateSmpData(s, sampleLength, sample16Bit))
{
loaderMsgBox("Error loading sample: Out of memory!");
return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
}
samplesRead = 0;
}
uint32_t blockSize = frame->header.blocksize;
const uint32_t samplesAllocated = sampleLength;
if (samplesRead+blockSize > samplesAllocated)
blockSize = samplesAllocated-samplesRead;
if (stereoSampleLoadMode == STEREO_SAMPLE_CONVERT) // mix to mono
{
const int32_t *src32_L = buffer[0];
const int32_t *src32_R = buffer[1];
switch (bitDepth)
{
case 8:
{
int8_t *dst8 = s->dataPtr + samplesRead;
for (uint32_t i = 0; i < blockSize; i++)
dst8[i] = (int8_t)((src32_L[i] + src32_R[i]) >> 1);
}
break;
case 16:
{
int16_t *dst16 = (int16_t *)s->dataPtr + samplesRead;
for (uint32_t i = 0; i < blockSize; i++)
dst16[i] = (int16_t)((src32_L[i] + src32_R[i]) >> 1);
}
break;
case 24:
{
int16_t *dst16 = (int16_t *)s->dataPtr + samplesRead;
for (uint32_t i = 0; i < blockSize; i++)
dst16[i] = (int16_t)((src32_L[i] + src32_R[i]) >> (16+1));
}
break;
default: break;
}
}
else // mono sample
{
const int32_t *src32 = (stereoSampleLoadMode == STEREO_SAMPLE_READ_RIGHT) ? buffer[1] : buffer[0];
switch (bitDepth)
{
case 8:
{
int8_t *dst8 = s->dataPtr + samplesRead;
for (uint32_t i = 0; i < blockSize; i++)
dst8[i] = (int8_t)src32[i];
}
break;
case 16:
{
int16_t *dst16 = (int16_t *)s->dataPtr + samplesRead;
for (uint32_t i = 0; i < blockSize; i++)
dst16[i] = (int16_t)src32[i];
}
break;
case 24:
{
int16_t *dst16 = (int16_t *)s->dataPtr + samplesRead;
for (uint32_t i = 0; i < blockSize; i++)
dst16[i] = (int16_t)(src32[i] >> 8);
}
break;
default: break;
}
}
samplesRead += blockSize;
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;
}
#endif