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