First version.

Makefile

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+all:
+	gcc main.c -o pcm2wav
+clean:
+	rm pcm2wav

main.c

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+#include "stdio.h"
+
+typedef unsigned char ID[4];
+
+typedef struct
+{
+  ID             chunkID;  /* {'f', 'm', 't', ' '} */
+  long           chunkSize;
+
+  short          wFormatTag;
+  unsigned short wChannels;
+  unsigned long  dwSamplesPerSec;
+  unsigned long  dwAvgBytesPerSec;
+  unsigned short wBlockAlign;
+  unsigned short wBitsPerSample;
+  /* Note: there may be additional fields here, 
+     depending upon wFormatTag. */
+} FormatChunk;
+
+typedef struct
+{
+  ID             chunkID;  /* {'d', 'a', 't', 'a'}  */
+  long           chunkSize;
+  unsigned char  waveformData[];
+} DataChunk;
+
+void usage(char *command)
+{
+  printf("usage:\n"
+         "\t%s pcmfile wavfile channel samplerate bitspersample\n", command);
+}
+
+int main(int argc, char *argv[])
+{
+  FILE *pcmfile, *wavfile;
+  long  pcmfile_size, chunk_size;
+  FormatChunk formatchunk;
+  DataChunk   datachunk;
+  int i, read_len;
+  char buf[1024];
+  short tmp;
+
+  if (argc != 6) {
+    usage(argv[0]);
+    return 1;
+  }
+
+  pcmfile = fopen(argv[1], "rb");
+  if (pcmfile == NULL) {
+    printf("!Error: Can't open pcmfile.\n");
+    return 1;
+  }
+  fseek(pcmfile, 0, SEEK_END);
+  pcmfile_size = ftell(pcmfile);
+  fseek(pcmfile, 0, SEEK_SET);
+
+  wavfile = fopen(argv[2], "wb");
+  if (wavfile == NULL) {
+    printf("!Error: Can't create wavfile.\n");
+    return 1;
+  }
+
+  fwrite("RIFF", 1, 4, wavfile);
+  fwrite("xxxx", 1, 4, wavfile);  //reserved for the total chunk size
+  fwrite("WAVE", 1, 4, wavfile);
+
+  formatchunk.chunkID[0] = 'f';
+  formatchunk.chunkID[1] = 'm';
+  formatchunk.chunkID[2] = 't';
+  formatchunk.chunkID[3] = ' ';
+  formatchunk.chunkSize  = sizeof(FormatChunk) - sizeof(ID) - sizeof(long);
+  formatchunk.wFormatTag = 1;   /* uncompressed */
+  formatchunk.wChannels = atoi(argv[3]);
+  formatchunk.dwSamplesPerSec = atoi(argv[4]);
+  formatchunk.wBitsPerSample = atoi(argv[5]);
+  formatchunk.wBlockAlign = formatchunk.wChannels * (formatchunk.wBitsPerSample >> 3);
+  formatchunk.dwAvgBytesPerSec =  formatchunk.wBlockAlign * formatchunk.dwSamplesPerSec;
+  fwrite(&formatchunk, 1, sizeof(formatchunk), wavfile);
+
+  datachunk.chunkID[0] = 'd';
+  datachunk.chunkID[1] = 'a';
+  datachunk.chunkID[2] = 't';
+  datachunk.chunkID[3] = 'a';
+  datachunk.chunkSize = pcmfile_size;
+  fwrite(&datachunk, 1, sizeof(ID)+sizeof(long), wavfile);
+
+  while((read_len = fread(buf, 1, sizeof(buf), pcmfile)) != 0) {
+    /* revert the endiean */
+#if 0
+    for (i=0; i<read_len; i+=2) {
+      tmp = buf[i];
+      buf[i] = buf[i+1];
+      buf[i+1] = tmp;
+    }
+#endif
+    fwrite(buf, 1, read_len, wavfile);
+  }
+
+  fseek(wavfile, 4, SEEK_SET);
+  chunk_size = 4 + (8 + formatchunk.chunkSize) + (8 + datachunk.chunkSize);
+  fwrite(&chunk_size, 1, 4, wavfile);
+
+  fclose(pcmfile);
+  fclose(wavfile);
+}

wav2pcm.sh

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+dd if=1.wav of=1.pcm bs=1 skip=44