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2026-07-20 19:01:03 +08:00
parent ea01b9cf99
commit ef1bf61f9f
4484 changed files with 937163 additions and 1 deletions
@@ -0,0 +1,111 @@
+#define _CRT_SECURE_NO_WARNINGS
+
+#include "wave.h"
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+
+char riff[4] = { 'R', 'I', 'F', 'F' };
+char wave[4] = { 'W', 'A', 'V', 'E' };
+char fmt[4]  = { 'f', 'm', 't', ' ' };
+char dat[4]  = { 'd', 'a', 't', 'a' };
+
+void writeWave(const char* filename, int freq, int channels, short* buffer, int samples) {
+	struct WaveHeader wh;
+	int i;
+	int elemWritten;
+	FILE *f;
+
+	for(i=0; i<4; i++) {
+		wh.riffId[i] = riff[i];
+		wh.riffType[i] = wave[i];
+		wh.fmtId[i] = fmt[i];
+		wh.dataId[i] = dat[i];
+	}
+
+	/* Format chunk */
+	wh.fmtLen = 16;
+	wh.formatTag = 1;  /* PCM */
+	wh.channels = channels;  
+	wh.samplesPerSec =  freq;
+	wh.avgBytesPerSec = freq * channels * sizeof(short);
+	wh.blockAlign = channels * sizeof(short);
+	wh.bitsPerSample = sizeof(short)*8;
+	wh.dataLen = samples * channels * sizeof(short);
+	wh.len = 36 + wh.dataLen;
+
+	f = fopen(filename,"wb");
+	if (!f) {
+		printf("error: could not write wave\n");
+		return;
+	}
+
+	elemWritten = fwrite(&wh, sizeof(wh), 1, f);
+	if (elemWritten) elemWritten = fwrite(buffer, wh.dataLen, 1, f);
+	fclose(f);
+	
+	if (!elemWritten){
+		printf("error: could not write wave\n");
+	}
+}
+
+int readWave(const char* filename, int* freq, int* channels, short** buffer, int* samples) {
+	struct WaveHeader wh;
+	FILE *f;
+	int i;
+	int elemsRead;
+
+	memset(&wh, 0, sizeof(wh));
+
+	f = fopen(filename,"rb");
+	if (!f) {
+		printf("error: could not open wave %s\n",filename);
+		return 0;
+	}
+
+	fread(&wh, sizeof(wh), 1, f);
+	
+	for(i=0; i<4; i++) {
+		if ((wh.riffId[i] != riff[i]) ||
+			(wh.riffType[i] != wave[i]) ||
+			(wh.fmtId[i] != fmt[i]) ||
+			(wh.dataId[i] != dat[i])){
+				goto closeError;
+		}
+	}
+	// Format chunk
+	if (wh.fmtLen != 16) goto closeError;
+	if (wh.formatTag != 1) goto closeError;
+	*channels = wh.channels;
+	if (*channels <1 || *channels >2) goto closeError;
+	*freq = wh.samplesPerSec;
+	if (wh.blockAlign != *channels * sizeof(short)) goto closeError;
+	*samples = wh.dataLen / (*channels * sizeof(short));
+
+	if (*samples < *freq) {
+		fclose(f);
+		printf("error: wave file is too short\n");
+		return 0;
+	}
+	
+	(*buffer) = (short*) malloc(wh.dataLen);
+	if (!*buffer){
+		printf("error: could not allocate memory for wave\n");
+		return 0;
+	}
+
+	elemsRead = fread(*buffer, wh.dataLen, 1, f);
+	fclose(f);
+	if (elemsRead != 1){
+		printf("error: reading wave file\n");
+		return 0;
+	}
+
+	return 1;
+
+closeError:
+	fclose(f);
+	printf("error: invalid wave file %s\n",filename);
+	return 0;
+}