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#include "AudioCoderFlac.h"
#include <bfc/platform/types.h>
#include <FLAC/metadata.h>
AudioCoderFlac::AudioCoderFlac(unsigned int nch, unsigned int bps, unsigned int samplerate, unsigned int compression)
{
/* initialize stuff first so we can clean up safely if things go wrong */
finished = false;
finishedBytes = 0;
padding = 0;
encoder = 0;
win32State.bytesWritten = 0;
win32State.handle = INVALID_HANDLE_VALUE;
tempFile[0]=0;
wchar_t tempPath[MAX_PATH-14] = {0};
GetTempPath(MAX_PATH-14, tempPath);
GetTempFileName(tempPath, L"wfl", 0, tempFile);
win32State.handle = CreateFile(tempFile, GENERIC_READ|GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, 0, 0);
if (win32State.handle != INVALID_HANDLE_VALUE)
{
this->nch = nch;
this->bps = bps;
encoder = FLAC__stream_encoder_new();
if (!encoder)
return;
// set stream info
if (!FLAC__stream_encoder_set_channels(encoder, nch)
|| !FLAC__stream_encoder_set_bits_per_sample(encoder, bps)
|| !FLAC__stream_encoder_set_sample_rate(encoder, samplerate)
|| !FLAC__stream_encoder_set_total_samples_estimate(encoder, 0)
|| !FLAC__stream_encoder_set_compression_level(encoder, compression)
|| !FLAC__stream_encoder_set_blocksize(encoder, 0))
{
FLAC__stream_encoder_delete(encoder);
encoder=0;
return;
}
// TODO: set any more config stuff
// TODO: seektable?
//FLAC__StreamMetadata *seektable = FLAC__metadata_object_new(FLAC__METADATA_TYPE_SEEKTABLE);
padding = FLAC__metadata_object_new(FLAC__METADATA_TYPE_PADDING);
if (padding)
{
padding->length = 16384; // TODO: configurable padding size
if (!FLAC__stream_encoder_set_metadata(encoder, &padding, 1))
{
FLAC__stream_encoder_delete(encoder);
encoder=0;
return;
}
}
if (FLAC__stream_encoder_init_stream(encoder, Win32_Write, Win32_Seek, Win32_Tell, NULL, &win32State) != FLAC__STREAM_ENCODER_INIT_STATUS_OK)
{
FLAC__stream_encoder_delete(encoder);
encoder=0;
return;
}
}
}
bool AudioCoderFlac::OK()
{
if (!encoder)
return false;
return FLAC__stream_encoder_get_state(encoder) == FLAC__STREAM_ENCODER_OK;
}
AudioCoderFlac::~AudioCoderFlac()
{
if (encoder)
FLAC__stream_encoder_delete(encoder);
if (padding)
FLAC__metadata_object_delete(padding);
if (win32State.handle != INVALID_HANDLE_VALUE)
CloseHandle(win32State.handle);
}
static void Copy8(FLAC__int32 *buffer, void *inputData, int numSamples)
{
uint8_t *in = (uint8_t *)inputData;
for (int i=0;i<numSamples;i++)
{
buffer[i] = (FLAC__int32)in[i];
}
}
static void Copy16(FLAC__int32 *buffer, void *inputData, int numSamples)
{
int16_t *in = (int16_t *)inputData;
for (int i=0;i<numSamples;i++)
{
buffer[i] = (FLAC__int32)in[i];
}
}
static void Copy24(FLAC__int32 *buffer, void *inputData, int numSamples)
{
uint8_t *in = (uint8_t *)inputData;
for (int i=0;i<numSamples;i++)
{
FLAC__int32 val = (((FLAC__int32)in[0]) << 0);
val = val | (((FLAC__int32)in[1]) << 8);
val = val | (((FLAC__int32)in[2]) << 16);
buffer[i] = (FLAC__int32)val;
in+=3;
}
}
static void Copy32(FLAC__int32 *buffer, void *inputData, int numSamples)
{
int32_t *in = (int32_t *)inputData;
for (int i=0;i<numSamples;i++)
{
buffer[i] = (FLAC__int32)in[i];
}
}
int AudioCoderFlac::Encode(int framepos, void *in, int in_avail, int *in_used, void *out, int out_avail)
{
FLAC__int32 buffer[65536];
FLAC__uint64 startBytes = win32State.bytesWritten;
if (!in_avail)
{
if (finished)
{
int ret = (int)finishedBytes;
finishedBytes = 0;
return ret;
}
return 0;
}
int numSamples = in_avail/(bps/8);
if (numSamples>65536)
numSamples = 65536;
switch (bps)
{
case 8:
Copy8(buffer, in, numSamples);
break;
case 16:
Copy16(buffer, in, numSamples);
break;
case 24:
Copy24(buffer, in, numSamples);
break;
case 32:
Copy32(buffer, in, numSamples);
break;
}
FLAC__bool result = FLAC__stream_encoder_process_interleaved(encoder, buffer, numSamples/nch);
if (result)
{
*in_used = numSamples*(bps/8);
return (int)(win32State.bytesWritten - startBytes);
}
return 0;
}
void AudioCoderFlac::PrepareToFinish()
{
FLAC__uint64 startBytes = win32State.bytesWritten;
FLAC__stream_encoder_finish(encoder);
finishedBytes = win32State.bytesWritten - startBytes;
}
void AudioCoderFlac::Finish(const wchar_t *destination)
{
if (win32State.handle != INVALID_HANDLE_VALUE)
CloseHandle(win32State.handle);
win32State.handle = INVALID_HANDLE_VALUE;
if (!MoveFile(tempFile, destination))
{
if (CopyFile(tempFile, destination, FALSE))
DeleteFile(tempFile);
}
}
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