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64 lines
2.3 KiB
C
64 lines
2.3 KiB
C
#ifndef TAD32_ENCODER_H
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#define TAD32_ENCODER_H
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#include <stdint.h>
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#include <stddef.h>
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// TAD32 (Terrarum Advanced Audio - PCM32f version) Encoder
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// DWT-based perceptual audio codec for TSVM
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// Alternative version: PCM32f throughout encoding, PCM8 conversion only at decoder
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// Constants
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#define TAD32_COEFF_SCALARS {64.0f, 45.255f, 32.0f, 22.627f, 16.0f, 11.314f, 8.0f, 5.657f, 4.0f, 2.828f} // value only valid for CDF 9/7 with decomposition level 9. Index 0 = LL band
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#define TAD32_MIN_CHUNK_SIZE 1024 // Minimum: 1024 samples
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#define TAD32_SAMPLE_RATE 32000
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#define TAD32_CHANNELS 2 // Stereo
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#define TAD32_SIGMAP_2BIT 1 // 2-bit: 00=0, 01=+1, 10=-1, 11=other
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#define TAD32_QUALITY_MIN 0
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#define TAD32_QUALITY_MAX 6
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#define TAD32_QUALITY_DEFAULT 3
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#define TAD32_ZSTD_LEVEL 15
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static inline int tad32_quality_to_max_index(int quality) {
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static const int quality_map[6] = {21, 31, 44, 63, 89, 127};
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if (quality < 0) quality = 0;
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if (quality > 5) quality = 5;
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return quality_map[quality];
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}
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/**
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* Encode audio chunk with TAD32 codec (PCM32f version)
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*
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* @param pcm32_stereo Input PCM32fLE stereo samples (interleaved L,R)
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* @param num_samples Number of samples per channel (min 1024)
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* @param max_index Maximum quantization index (7=3bit, 15=4bit, 31=5bit, 63=6bit, 127=7bit)
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* @param quantiser_scale Quantiser scaling factor (1.0=baseline, 2.0=2x coarser quantization)
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* Higher values = more aggressive quantization = smaller files
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* @param output Output buffer (must be large enough)
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* @return Number of bytes written to output, or 0 on error
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*
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* Output format:
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* uint16 sample_count (samples per channel)
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* uint8 max_index (maximum quantization index)
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* uint32 payload_size (bytes in payload)
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* * payload (encoded M/S data, Zstd-compressed with 2-bit twobitmap)
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*/
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size_t tad32_encode_chunk(const float *pcm32_stereo, size_t num_samples,
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int max_index,
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float quantiser_scale, uint8_t *output);
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/**
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* Print accumulated coefficient statistics
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* Only effective if TAD_COEFF_STATS environment variable is set
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*/
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void tad32_print_statistics(void);
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/**
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* Free accumulated statistics memory
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* Should be called after tad32_print_statistics()
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*/
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void tad32_free_statistics(void);
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#endif // TAD32_ENCODER_H
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