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#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include "ALACDecoder.h"
#include "ALACBitUtilities.h"
#include "EndianPortable.h"
#include "ALACAudioTypes.h"
#include <iostream>
// Opaque struct
typedef struct
{
ALACDecoder decoder;
uint32_t channels;
uint32_t bit_depth;
uint32_t frame_length;
} alac_decoder_t;
extern "C" alac_decoder_t *alac_decoder_init_from_config(const ALACSpecificConfig *parsedConfig)
{
alac_decoder_t *ctx = new alac_decoder_t();
if (!ctx)
return NULL;
ctx->channels = parsedConfig->numChannels;
ctx->bit_depth = parsedConfig->bitDepth;
ctx->frame_length = parsedConfig->frameLength;
ALACSpecificConfig config_to_decoder = *parsedConfig;
config_to_decoder.frameLength = Swap32NtoB(parsedConfig->frameLength);
config_to_decoder.maxRun = Swap16NtoB(parsedConfig->maxRun);
config_to_decoder.maxFrameBytes = Swap32NtoB(parsedConfig->maxFrameBytes);
config_to_decoder.avgBitRate = Swap32NtoB(parsedConfig->avgBitRate);
config_to_decoder.sampleRate = Swap32NtoB(parsedConfig->sampleRate);
if (ctx->decoder.Init(&config_to_decoder, sizeof(config_to_decoder)) != 0)
{
delete ctx;
return NULL;
}
return ctx;
}
extern "C" int alac_decoder_decode(alac_decoder_t *ctx, uint8_t *inbuffer, uint32_t inbuffer_size,
int32_t *outbuffer, uint32_t *samples_decoded)
{
if (!ctx || !samples_decoded)
return -1;
BitBuffer bits;
BitBufferInit(&bits, inbuffer, inbuffer_size);
BitBufferByteAlign(&bits, true);
int32_t ret = ctx->decoder.Decode(&bits,
(uint8_t *)outbuffer,
ctx->frame_length,
ctx->channels,
samples_decoded);
return ret;
}
extern "C" void alac_decoder_free(alac_decoder_t *ctx)
{
if (ctx)
delete ctx;
}
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