58 lines
1.4 KiB
C
58 lines
1.4 KiB
C
#ifndef CROSSFADE_H
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#define CROSSFADE_H
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#include <stdint.h>
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enum CROSSFADE_STATUS_T {
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CROSSFADE_STATUS_OK = 0,
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CROSSFADE_STATUS_ERROR,
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CROSSFADE_STATUS_NO_BUF,
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CROSSFADE_STATUS_BUF_MISALIGN,
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CROSSFADE_STATUS_BUF_TOO_SMALL,
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};
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typedef struct
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{
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float overlap_time;
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float coef1;
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float coef2;
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void *buf;
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uint32_t size;
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} CrossFadeConfig;
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typedef void *CrossFadeId;
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#ifdef __cplusplus
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extern "C" {
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#endif
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uint32_t crossfade_get_buffer_size(void);
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enum CROSSFADE_STATUS_T crossfade_init(int32_t sample_rate, int32_t sample_bits, CrossFadeConfig *cfg, CrossFadeId *id);
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void crossfade_destroy(CrossFadeId id);
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/*
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* outbuf = (1 - weight) * inbuf1 + weight * (coef1 * inbuf1 + coef2 * inbuf2)
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* = (1 - weight + weight * coef1) * inbuf1 + weight * coef2 * inbuf2
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* = (1 - (1 - coef1) * weight) * inbuf1 + weight * coef2 * inbuf2;
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* out_ch_num = max(ch_num1, ch_num2);
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* final data is outbuf = inbuf1 * coef1 + inbuf2 * coef2;
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*
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* fadein:
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* crossfade_process(st, NULL, 1, inbuf, ch_num, outbuf, frame_size);
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*
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* fadeout:
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* crossfade_process(st, inbuf, ch_num, NULL, 1, frame_size);
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*
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* crossfade: (ch_num1 == ch_num2 || ch_num1 == 1 || ch_num2 == 1)
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* crossfade_process(st, inbuf1, ch_num1, inbuf2, ch_num2, outbuf, frame_size);
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*/
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bool crossfade_process(CrossFadeId id, void *inbuf1, int32_t ch_num1, void *inbuf2, int32_t ch_num2, void *outbuf, int32_t frame_size);
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#ifdef __cplusplus
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}
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#endif
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#endif |