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74 lines
2.0 KiB
C
74 lines
2.0 KiB
C
/*
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* util.h - utility functions
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*/
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#include "streamtypes.h"
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#ifndef _UTIL_H
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#define _UTIL_H
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/* host endian independent multi-byte integer reading */
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static inline int16_t get_16bitBE(uint8_t * p) {
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return (p[0]<<8) | (p[1]);
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}
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static inline int16_t get_16bitLE(uint8_t * p) {
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return (p[0]) | (p[1]<<8);
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}
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static inline int32_t get_32bitBE(uint8_t * p) {
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return (p[0]<<24) | (p[1]<<16) | (p[2]<<8) | (p[3]);
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}
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static inline int32_t get_32bitLE(uint8_t * p) {
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return (p[0]) | (p[1]<<8) | (p[2]<<16) | (p[3]<<24);
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}
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void put_16bitLE(uint8_t * buf, int16_t i);
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void put_32bitLE(uint8_t * buf, int32_t i);
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void put_16bitBE(uint8_t * buf, int16_t i);
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void put_32bitBE(uint8_t * buf, int32_t i);
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/* signed nibbles come up a lot */
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static int nibble_to_int[16] = {0,1,2,3,4,5,6,7,-8,-7,-6,-5,-4,-3,-2,-1};
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static inline int get_high_nibble_signed(uint8_t n) {
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/*return ((n&0x70)-(n&0x80))>>4;*/
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return nibble_to_int[n>>4];
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}
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static inline int get_low_nibble_signed(uint8_t n) {
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/*return (n&7)-(n&8);*/
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return nibble_to_int[n&0xf];
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}
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/* return true for a good sample rate */
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int check_sample_rate(int32_t sr);
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/* return a file's extension (a pointer to the first character of the
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* extension in the original filename or the ending null byte if no extension
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*/
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const char * filename_extension(const char * filename);
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static inline int clamp16(int32_t val) {
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if (val>32767) return 32767;
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if (val<-32768) return -32768;
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return val;
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}
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/* make a header for PCM .wav */
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/* buffer must be 0x2c bytes */
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void make_wav_header(uint8_t * buf, int32_t sample_count, int32_t sample_rate, int channels);
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void make_smpl_chunk(uint8_t * buf, int32_t loop_start, int32_t loop_end);
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void swap_samples_le(sample *buf, int count);
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void concatn(int length, char * dst, const char * src);
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void concatn_doublenull(int length, char * dst, const char * src);
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void concatn_fitting_doublenull(int length, char * dst, const char * src);
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#endif
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