27 lines
1.6 KiB
C
27 lines
1.6 KiB
C
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#include "xtc/xtc_sample.h"
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#include "wave_internal.h"
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#include <stdlib.h>
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#include <math.h>
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struct xtc_sample {xtc_wave wave;};
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static int range(const xtc_sample *s,size_t begin,size_t end){return s && begin<end && end<=s->wave.frames;}
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void xtc_sample_destroy(xtc_sample *s){if(s){free(s->wave.samples);free(s);}}
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xtc_result xtc_sample_load(const char *path,xtc_sample **out)
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{
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xtc_sample *s;xtc_result r;if(!path || !out)return XTC_ERR_INVALID_ARGUMENT;
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s=calloc(1,sizeof(*s));if(!s)return XTC_ERR_OUT_OF_MEMORY;
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r=xtc_wave_load(path,&s->wave);
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if(r==XTC_OK && s->wave.frames>XTC_SAMPLE_MAX_FRAMES)r=XTC_ERR_CAPACITY;
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if(r!=XTC_OK){xtc_sample_destroy(s);return r;}*out=s;return XTC_OK;
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}
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xtc_result xtc_sample_info(const xtc_sample *s,unsigned int *rate,size_t *frames)
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{if(!s || !rate || !frames)return XTC_ERR_INVALID_ARGUMENT;*rate=s->wave.rate;*frames=s->wave.frames;return XTC_OK;}
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xtc_result xtc_sample_read(const xtc_sample *s,size_t frame,float *out)
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{if(!s || !out || frame>=s->wave.frames)return XTC_ERR_INVALID_ARGUMENT;*out=s->wave.samples[frame];return XTC_OK;}
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xtc_result xtc_sample_analyze(const xtc_sample *s,size_t begin,size_t end,xtc_sample_stats *out)
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{
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size_t i;double sum=0,square=0;xtc_sample_stats result;
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if(!range(s,begin,end) || !out)return XTC_ERR_INVALID_ARGUMENT;
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result.minimum=result.maximum=s->wave.samples[begin];
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for(i=begin;i<end;++i){float v=s->wave.samples[i];if(v<result.minimum)result.minimum=v;if(v>result.maximum)result.maximum=v;sum+=v;square+=(double)v*v;}
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result.mean=sum/(double)(end-begin);result.rms=sqrt(square/(double)(end-begin));*out=result;return XTC_OK;
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}
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