59 lines
1.6 KiB
C++
59 lines
1.6 KiB
C++
#include <string.h>
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// these are headers for the ALAC decoder, utilities and endian utilities
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#include <alac/ALACDecoder.h>
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#include <alac/ALACBitUtilities.h>
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#include <alac/EndianPortable.h>
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#include "config.h"
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#include "apple_alac.h"
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typedef struct magicCookie {
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ALACSpecificConfig config;
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ALACAudioChannelLayout channelLayoutInfo; // seems to be unused
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} magicCookie;
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magicCookie cookie;
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ALACDecoder * theDecoder;
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extern "C" int apple_alac_init(int frame_size,int sample_size,int sample_rate) {
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memset(&cookie,0,sizeof(magicCookie));
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#define CHANNELS_PER_FRAME 2
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//create a magic cookie for the decoder
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cookie.config.frameLength = Swap32NtoB(frame_size);
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cookie.config.compatibleVersion = 0;
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cookie.config.bitDepth = sample_size;
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cookie.config.pb = 40;
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cookie.config.mb = 10;
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cookie.config.kb = 14;
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cookie.config.numChannels = CHANNELS_PER_FRAME;
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cookie.config.maxRun = Swap16NtoB(255);
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cookie.config.maxFrameBytes = 0;
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cookie.config.avgBitRate = 0;
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cookie.config.sampleRate = Swap32NtoB(sample_rate);
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theDecoder = new ALACDecoder;
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theDecoder->Init(&cookie, sizeof(magicCookie));
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return 0;
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}
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extern "C" int apple_alac_decode_frame(unsigned char *sampleBuffer, uint32_t bufferLength, unsigned char *dest, int *outsize)
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{
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uint32_t numFrames = 0;
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BitBuffer theInputBuffer;
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BitBufferInit(&theInputBuffer, sampleBuffer, bufferLength);
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theDecoder->Decode(&theInputBuffer, dest, Swap32BtoN(cookie.config.frameLength), CHANNELS_PER_FRAME, &numFrames);
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*outsize = numFrames;
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return 0;
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}
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extern "C" int apple_alac_terminate() {
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delete(theDecoder);
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}
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