fork download
copy 
  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <stdint.h>
  4. #include <stdarg.h>
  5. #include <string.h>
  6. #include <ctype.h>
  7. #include <sys/types.h>
  8. #include <sys/stat.h>
  9. #include <dirent.h>
  10.  
  11. uint8_t ulaw_encode(int16_t audio);
  12. void print_byte(FILE *out, uint8_t b);
  13. void filename2samplename(void);
  14. uint32_t padding(uint32_t length, uint32_t block);
  15. uint8_t read_uint8(FILE *in);
  16. int16_t read_int16(FILE *in);
  17. uint32_t read_uint32(FILE *in);
  18. void die(const char *format, ...) __attribute__ ((format (printf, 1, 2)));
  19.  
  20. // WAV file format:
  21. // http://w...content-available-to-author-only...l.ca/Documents/AudioFormats/WAVE/WAVE.html
  22.  
  23. const char *filename="";
  24. char samplename[64];
  25. unsigned int bcount, wcount;
  26. unsigned int total_length=0;
  27. int pcm_mode=0;
  28.  
  29. void wav2c(FILE *in, FILE *out, FILE *outh)
  30. {
  31. 	uint32_t header[4];
  32. 	int16_t format, channels, bits;
  33. 	uint32_t rate;
  34. 	uint32_t i, length, padlength=0, arraylen;
  35. 	uint32_t chunkSize;
  36. 	int32_t audio=0;
  37.  
  38. 	// read the WAV file's header
  39. 	for (i=0; i < 4; i++) {
  40. 		header[i] = read_uint32(in);
  41. 	}
  42. 	while (header[3] != 0x20746D66) {
  43. 		// skip past unknown sections until "fmt "
  44. 		chunkSize = read_uint32(in);
  45. 		for (i=0; i < chunkSize; i++) {
  46. 			read_uint8(in);
  47. 		}
  48. 		header[3] = read_uint32(in);
  49. 	}
  50. 	chunkSize = read_uint32(in);
  51.  
  52. 	// read the audio format parameters
  53. 	format = read_int16(in);
  54. 	channels = read_int16(in);
  55. 	rate = read_uint32(in);
  56. 	read_uint32(in); // ignore byterate
  57. 	read_int16(in);  // ignore blockalign
  58. 	bits = read_int16(in);
  59. 	//printf("format: %d, channels: %d, rate: %d, bits %d\n", format, channels, rate, bits);
  60. 	if (format != 1)
  61. 		die("file %s is compressed, only uncompressed supported", filename);
  62. 	if (rate != 44100 && rate != 22050 && rate != 11025 /*&& rate != 8000*/ )
  63. 		die("sample rate %d in %s is unsupported\n"
  64. 		  "Only 44100, 22050, 11025 work", rate, filename);
  65. 	if (channels != 1 && channels != 2)
  66. 		die("file %s has %d channels, but only 1 & 2 are supported", filename, channels);
  67. 	if (bits != 16)
  68. 		die("file %s has %d bit format, but only 16 is supported", filename, bits);
  69.  
  70. 	// skip past any extra data on the WAVE header (hopefully it doesn't matter?)
  71. 	for (chunkSize -= 16; chunkSize > 0; chunkSize--) {
  72. 		read_uint8(in);
  73. 	}
  74.  
  75. 	// read the data header, skip non-audio data
  76. 	while (1) {
  77. 		header[0] = read_uint32(in);
  78. 		length = read_uint32(in);
  79. 		if (header[0] == 0x61746164) break; // beginning of actual audio data
  80. 		// skip over non-audio data
  81. 		for (i=0; i < length; i++) {
  82. 			read_uint8(in);
  83. 		}
  84. 	}
  85.  
  86. 	// the length must be a multiple of the data size
  87. 	if (channels == 2) {
  88. 		if (length % 4) die("file %s data length is not a multiple of 4", filename);
  89. 		length = length / 4;
  90. 	}
  91. 	if (channels == 1) {
  92. 		if (length % 1) die("file %s data length is not a multiple of 2", filename);
  93. 		length = length / 2;
  94. 	}
  95. 	if (length > 0xFFFFFF) die("file %s data length is too long", filename);
  96. 	bcount = 0;
  97.  
  98. 	// AudioPlayMemory requires padding to 2.9 ms boundary (128 samples @ 44100)
  99. 	if (rate == 44100) {
  100. 		padlength = padding(length, 128);
  101. 		format = 1;
  102. 	} else if (rate == 22050) {
  103. 		padlength = padding(length, 64);
  104. 		format = 2;
  105. 	} else if (rate == 11025) {
  106. 		padlength = padding(length, 32);
  107. 		format = 3;
  108. 	}
  109. 	if (pcm_mode) {
  110. 		arraylen = ((length + padlength) * 2 + 3) / 4 + 1;
  111. 		format |= 0x80;
  112. 	} else {
  113. 		arraylen = (length + padlength + 3) / 4 + 1;
  114. 	}
  115. 	total_length += arraylen;
  116.  
  117. 	// output a minimal header, just the length, #bits and sample rate
  118. 	fprintf(outh, "extern const unsigned int AudioSample%s[%d];\n", samplename, arraylen);	
  119. 	fprintf(out, "// Converted from %s, using %d Hz, %s encoding\n", filename, rate,
  120. 	  (pcm_mode ? "16 bit PCM" : "u-law"));
  121. 	fprintf(out, "PROGMEM const unsigned int AudioSample%s[%d] = {\n", samplename, arraylen);
  122. 	fprintf(out, "0x%08X,", length | (format << 24));
  123. 	wcount = 1;
  124.  
  125. 	// finally, read the audio data
  126. 	while (length > 0) {
  127. 		if (channels == 1) {
  128. 			audio = read_int16(in);
  129. 		} else {
  130. 			audio = read_int16(in);
  131. 			audio += read_int16(in);
  132. 			audio /= 2;
  133. 		}
  134. 		if (pcm_mode) {
  135. 			print_byte(out, audio);
  136. 			print_byte(out, audio >> 8);
  137. 		} else {
  138. 			print_byte(out, ulaw_encode(audio));
  139. 		}
  140. 		length--;
  141. 	}
  142. 	while (padlength > 0) {
  143. 		print_byte(out, 0);
  144. 		padlength--;
  145. 	}
  146. 	while (bcount > 0) {
  147. 		print_byte(out, 0);
  148. 	}
  149. 	if (wcount > 0) fprintf(out, "\n");
  150. 	fprintf(out, "};\n");
  151. }
  152.  
  153.  
  154. uint8_t ulaw_encode(int16_t audio)
  155. {
  156. 	uint32_t mag, neg;
  157.  
  158. 	// http://e...content-available-to-author-only...a.org/wiki/G.711
  159. 	if (audio >= 0) {
  160. 		mag = audio;
  161. 		neg = 0;
  162. 	} else {
  163. 		mag = audio * -1;
  164. 		neg = 0x80;
  165. 	}
  166. 	mag += 128;
  167. 	if (mag > 0x7FFF) mag = 0x7FFF;
  168. 	if (mag >= 0x4000) return neg | 0x70 | ((mag >> 10) & 0x0F);  // 01wx yz00 0000 0000
  169. 	if (mag >= 0x2000) return neg | 0x60 | ((mag >> 9) & 0x0F);   // 001w xyz0 0000 0000
  170. 	if (mag >= 0x1000) return neg | 0x50 | ((mag >> 8) & 0x0F);   // 0001 wxyz 0000 0000
  171. 	if (mag >= 0x0800) return neg | 0x40 | ((mag >> 7) & 0x0F);   // 0000 1wxy z000 0000
  172. 	if (mag >= 0x0400) return neg | 0x30 | ((mag >> 6) & 0x0F);   // 0000 01wx yz00 0000
  173. 	if (mag >= 0x0200) return neg | 0x20 | ((mag >> 5) & 0x0F);   // 0000 001w xyz0 0000
  174. 	if (mag >= 0x0100) return neg | 0x10 | ((mag >> 4) & 0x0F);   // 0000 0001 wxyz 0000
  175. 	else               return neg | 0x00 | ((mag >> 3) & 0x0F);   // 0000 0000 1wxy z000
  176. }
  177.  
  178.  
  179.  
  180. // compute the extra padding needed
  181. uint32_t padding(uint32_t length, uint32_t block)
  182. {
  183. 	uint32_t extra;
  184.  
  185. 	extra = length % block;
  186. 	if (extra == 0) return 0;
  187. 	return block - extra;
  188. }
  189.  
  190. // pack the output bytes into 32 bit words, lsb first, and
  191. // format the data nicely with commas and newlines
  192. void print_byte(FILE *out, uint8_t b)
  193. {
  194. 	static uint32_t buf32=0;
  195.  
  196. 	buf32 |= (b << (8 * bcount++));
  197. 	if (bcount >= 4) {
  198. 		fprintf(out, "0x%08X,", buf32);
  199. 		buf32 = 0;
  200. 		bcount = 0;
  201. 		if (++wcount >= 8) {
  202. 			fprintf(out, "\n");
  203. 			wcount = 0;
  204. 		}
  205. 	}
  206. }
  207.  
  208. // convert the WAV filename into a C-compatible name
  209. void filename2samplename(void)
  210. {
  211. 	int len, i, n;
  212. 	char c;
  213.  
  214. 	len = strlen(filename) - 4;
  215. 	if (len >= sizeof(samplename)-1) len = sizeof(samplename)-1;
  216. 	for (i=0, n=0; n < len; i++) {
  217. 		c = filename[i];
  218. 		if (isalpha(c) || c == '_' || (isdigit(c) && n > 0)) {
  219. 			samplename[n] = (n == 0) ? toupper(c) : tolower(c);
  220. 			n++;
  221. 		}
  222. 	}
  223. 	samplename[n] = 0;
  224. }
  225.  
  226.  
  227. const char *title = "// Audio data converted from WAV file by wav2sketch\n\n";
  228.  
  229. int main(int argc, char **argv)
  230. {
  231. 	DIR *dir;
  232. 	struct dirent *f;
  233. 	struct stat s;
  234. 	FILE *fp, *outc=NULL, *outh=NULL;
  235. 	char buf[128];
  236. 	int i, len;
  237.  
  238. 	// By default, audio is u-law encoded to reduce the memory requirement
  239. 	// in half.  However, u-law does add distortion.  If "-16" is specified
  240. 	// on the command line, the original 16 bit PCM samples are used.
  241. 	for (i=1; i < argc; i++) {
  242. 		if (strcmp(argv[i], "-16") == 0) pcm_mode = 1;
  243. 	}
  244. 	dir = opendir(".");
  245. 	if (!dir) die("unable to open directory");
  246. 	while (1) {
  247. 		f = readdir(dir);
  248. 		if (!f) break;
  249. 		//if ((f->d_type & DT_DIR)) continue; // skip directories
  250. 		//if (!(f->d_type & DT_REG)) continue; // skip special files
  251. 		if (stat(f->d_name, &s) < 0) continue; // skip if unable to stat
  252. 		if (S_ISDIR(s.st_mode)) continue;  // skip directories
  253. 		if (!S_ISREG(s.st_mode)) continue; // skip special files
  254. 		filename = f->d_name;
  255. 		len = strlen(filename);
  256. 		if (len < 5) continue;
  257. 		if (strcasecmp(filename + len - 4, ".wav") != 0) continue;
  258. 		fp = fopen(filename, "rb");
  259. 		if (!fp) die("unable to read file %s", filename);
  260. 		filename2samplename();
  261. 		printf("converting: %s  -->  AudioSample%s\n", filename, samplename);
  262. 		snprintf(buf, sizeof(buf), "AudioSample%s.cpp", samplename);
  263. 		outc = fopen(buf, "w");
  264. 		if (outc == NULL) die("unable to write %s", buf);
  265. 		snprintf(buf, sizeof(buf), "AudioSample%s.h", samplename);
  266. 		outh = fopen(buf, "w");
  267. 		if (outh == NULL) die("unable to write %s\n", buf);
  268. 		fprintf(outh, "%s", title);
  269. 		fprintf(outc, "%s", title);
  270. 		fprintf(outc, "#include <Arduino.h>\n");
  271. 		fprintf(outc, "#include \"%s\"\n\n", buf);
  272. 		wav2c(fp, outc, outh);
  273. 		//wav2c(fp, stdout, stdout);
  274. 		fclose(outc);
  275. 		fclose(outh);
  276. 		fclose(fp);
  277. 	}
  278. 	printf("Total data size %d bytes\n", total_length * 4);
  279. 	return 0;
  280. }
  281.  
  282. uint8_t read_uint8(FILE *in)
  283. {
  284. 	int c1;
  285.  
  286. 	c1 = fgetc(in);
  287. 	if (c1 == EOF) die("error, end of data while reading from %s\n", filename);
  288. 	c1 &= 255;
  289. 	return c1;
  290. }
  291.  
  292. int16_t read_int16(FILE *in)
  293. {
  294. 	int c1, c2;
  295.  
  296. 	c1 = fgetc(in);
  297. 	if (c1 == EOF) die("error, end of data while reading from %s\n", filename);
  298. 	c2 = fgetc(in);
  299. 	if (c2 == EOF) die("error, end of data while reading from %s\n", filename);
  300. 	c1 &= 255;
  301. 	c2 &= 255;
  302. 	return (c2 << 8) | c1;
  303. }
  304.  
  305. uint32_t read_uint32(FILE *in)
  306. {
  307. 	int c1, c2, c3, c4;
  308.  
  309. 	c1 = fgetc(in);
  310. 	if (c1 == EOF) die("error, end of data while reading from %s\n", filename);
  311. 	c2 = fgetc(in);
  312. 	if (c2 == EOF) die("error, end of data while reading from %s\n", filename);
  313. 	c3 = fgetc(in);
  314. 	if (c3 == EOF) die("error, end of data while reading from %s\n", filename);
  315. 	c4 = fgetc(in);
  316. 	if (c4 == EOF) die("error, end of data while reading from %s\n", filename);
  317. 	c1 &= 255;
  318. 	c2 &= 255;
  319. 	c3 &= 255;
  320. 	c4 &= 255;
  321. 	return (c4 << 24) | (c3 << 16) | (c2 << 8) | c1;
  322. }
  323.  
  324. void die(const char *format, ...)
  325. {
  326. 	va_list args;
  327. 	va_start(args, format);
  328. 	fprintf(stderr, "wav2sketch: ");
  329. 	vfprintf(stderr, format, args);
  330. 	fprintf(stderr, "\n");
  331. 	exit(1);
  332. }
  333.  
Success #stdin #stdout 0s 5308KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
Total data size 0 bytes
https://ideone.com/zIybyt
language:
C++ (gcc 8.3)
created:
2 hours ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!