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wav_lua.c
333 lines (316 loc) · 8.84 KB
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wav_lua.c
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#include <stdio.h>
#include <lua.h>
#include <lauxlib.h>
#include <lualib.h>
unsigned int getData(const unsigned char *p, int len) {
unsigned int res = 0;
int i;
for (i = len - 1; i >= 0; i--) {
res = (res << 8) | p[i];
}
return res;
}
void setData(unsigned char *p, unsigned int data, int len) {
int i;
for (i = 0; i < len; i++) {
p[i] = data & 0xff;
data >>= 8;
}
}
int isMatch(const unsigned char *data, const char *expected, int len) {
int i;
for (i = 0; i < len; i++) {
if (data[i] != ((const unsigned char*)expected)[i]) return 0;
}
return 1;
}
int main(int argc, char *argv[]) {
FILE *fp;
unsigned char header[44] = {};
unsigned int channel_num;
unsigned int sample_rate;
unsigned int bit_per_sample;
unsigned int block_size;
unsigned int data_size;
unsigned int sample_num;
unsigned int sample;
unsigned int channel;
int i;
int retnum;
lua_State *s;
if (argc < 4) {
fprintf(stderr, "Usage: %s <input file> <output file> <script file> [parameters...]\n", argc > 0 ? argv[0] : "wav_lua");
return 1;
}
if (argv[1][0] != '-' || argv[1][1] != '\0') {
unsigned int header_size;
fp = fopen(argv[1], "rb");
if (fp == NULL) {
fputs("input file open error\n", stderr);
return 1;
}
if (fread(header, 1, 44, fp) != 44) {
fputs("input file read error\n", stderr);
fclose(fp);
return 1;
}
channel_num = getData(&header[22], 2);
sample_rate = getData(&header[24], 4);
bit_per_sample = getData(&header[34], 2);
block_size = getData(&header[32], 2);
header_size = getData(&header[16], 4);
if (header_size > 16) {
if (fseek(fp, 20 + header_size, SEEK_SET)) {
fputs("input file seek error\n", stderr);
fclose(fp);
return 1;
}
header[16] = 0x10; header[17] = 0; header[18] = 0; header[19] = 0;
for (;;) {
if (fread(&header[36], 1, 8, fp) != 8) {
fputs("input file read error\n", stderr);
fclose(fp);
return 1;
}
if (isMatch(&header[36], "data", 4)) {
break;
} else {
unsigned int chunk_size = getData(&header[40], 4);
if (fseek(fp, chunk_size, SEEK_CUR)) {
fputs("input file seek error\n", stderr);
fclose(fp);
return 1;
}
}
}
}
data_size = getData(&header[40], 4);
if (!isMatch(&header[0], "RIFF", 4) || !isMatch(&header[8], "WAVEfmt ", 8) || !isMatch(&header[36], "data", 4) ||
getData(&header[20], 2) != 1 || getData(&header[28], 4) != channel_num * bit_per_sample / 8 * sample_rate ||
block_size != channel_num * bit_per_sample / 8 || data_size % block_size != 0 ||
(bit_per_sample != 8 && bit_per_sample != 16)) {
fputs("unsupported input format\n", stderr);
return 1;
}
sample_num = data_size / block_size;
s = luaL_newstate();
if (s == NULL) {
fputs("failed to create Lua state\n", stderr);
fclose(fp);
return 1;
}
luaL_openlibs(s);
if (luaL_dofile(s, argv[3])) {
const char *str = luaL_checkstring(s, -1);
fputs("failed to load Lua script\n", stderr);
if (str != NULL) fputs(str, stderr);
fclose(fp);
lua_close(s);
return 1;
}
if (lua_getglobal(s, "process") != LUA_TFUNCTION) {
fputs("process is not a function\n", stderr);
fclose(fp);
lua_close(s);
return 1;
}
lua_createtable(s, channel_num, 0);
for (channel = 0; channel < channel_num; channel++) {
lua_createtable(s, sample_num, 0);
}
for (sample = 1; sample <= sample_num; sample++) {
for (channel = 0; channel < channel_num; channel++) {
unsigned char data[2];
double value = 0;
if (fread(data, 1, bit_per_sample / 8, fp) != bit_per_sample / 8) {
fputs("input read error\n", stderr);
fclose(fp);
lua_close(s);
return 1;
}
if (bit_per_sample == 8) {
value = (double)(data[0] - 128) / 128.0;
} else if (bit_per_sample == 16) {
unsigned int v = getData(data, 2);
if (v & 0x8000) {
value = (double)(-((int)(~v+1) & 0xffff)) / 32768.0;
} else {
value = (double)v / 32768.0;
}
}
lua_pushnumber(s, value);
lua_seti(s, -2 - channel, sample);
}
}
fclose(fp);
for (channel = 1; channel <= channel_num; channel++) {
lua_seti(s, 2, channel);
}
} else {
header[0] = 'R'; header[1] = 'I'; header[2] = 'F'; header[3] = 'F';
header[8] = 'W'; header[9] = 'A'; header[10] = 'V'; header[11] = 'E';
header[12] = 'f'; header[13] = 'm'; header[14] = 't'; header[15] = ' ';
header[16] = 0x10; header[17] = 0; header[18] = 0; header[19] = 0;
header[20] = 1; header[21] = 0;
header[36]= 'd'; header[37] = 'a'; header[38] = 't'; header[39] = 'a';
channel_num = 0;
sample_rate = 44100;
bit_per_sample = 16;
block_size = 0;
data_size = 0;
s = luaL_newstate();
if (s == NULL) {
fputs("failed to create Lua state\n", stderr);
return 1;
}
luaL_openlibs(s);
if (luaL_dofile(s, argv[3])) {
const char *str = luaL_checkstring(s, -1);
fputs("failed to load Lua script\n", stderr);
if (str != NULL) fputs(str, stderr);
lua_close(s);
return 1;
}
if (lua_getglobal(s, "process") != LUA_TFUNCTION) {
fputs("process is not a function\n", stderr);
lua_close(s);
return 1;
}
lua_createtable(s, channel_num, 0);
}
lua_pushinteger(s, sample_rate);
lua_createtable(s, argc - 4, 0);
for (i = 0; i < argc - 4; i++) {
lua_pushstring(s, argv[i + 4]);
lua_seti(s, -2, i + 1);
}
if (lua_pcall(s, 3, LUA_MULTRET, 0) != LUA_OK) {
const char *str = luaL_checkstring(s, -1);
fputs("error in executing Lua script\n", stderr);
if (str != NULL) fputs(str, stderr);
lua_close(s);
return 1;
}
if (argv[2][0] != '-' || argv[2][1] != '\0') {
retnum = lua_gettop(s);
if (retnum > 3) {
fputs("too many return data from Lua script\n", stderr);
lua_close(s);
return 1;
} else if (retnum > 0 && !lua_isnil(s, 1)) {
if (!lua_istable(s, 1)) {
fputs("the first return data is neither a table nor nil\n", stderr);
lua_close(s);
return 1;
}
if (retnum >= 2) {
if (lua_isinteger(s, 2)) {
sample_rate = luaL_checkinteger(s, 2);
} else {
fputs("the second return data is not an integer\n", stderr);
lua_close(s);
return 1;
}
}
if (retnum >= 3) {
if (lua_isinteger(s, 3)) {
bit_per_sample = luaL_checkinteger(s, 3);
} else {
fputs("the third return data is not an integer\n", stderr);
lua_close(s);
return 1;
}
}
}
if (retnum > 1) lua_pop(s, retnum - 1);
channel_num = luaL_len(s, 1);
if (channel_num > 0) {
if (bit_per_sample != 8 && bit_per_sample != 16) {
fputs("unsupported output bit per sample\n", stderr);
lua_close(s);
return 1;
}
for (channel = 1; channel <= channel_num; channel++) {
lua_geti(s, 1, channel);
if (channel == 1) {
sample_num = luaL_len(s, -1);
} else if (sample_num != luaL_len(s, -1)) {
fputs("the number of samples mismatch\n", stderr);
lua_close(s);
return 1;
}
}
setData(&header[4], channel_num * bit_per_sample / 8 * sample_num + 36, 4);
setData(&header[22], channel_num, 2);
setData(&header[24], sample_rate, 4);
setData(&header[28], channel_num * bit_per_sample / 8 * sample_rate, 4);
setData(&header[32], channel_num * bit_per_sample / 8, 2);
setData(&header[34], bit_per_sample, 2);
setData(&header[40], channel_num * bit_per_sample / 8 * sample_num, 4);
for (sample = 1; sample <= sample_num; sample++) {
for (channel = 1; channel <= channel_num; channel++) {
lua_geti(s, channel + 1, sample);
if (!lua_isnumber(s, -1)) {
fputs("some of the data is invalid\n", stderr);
lua_close(s);
return 1;
}
lua_pop(s, 1);
}
}
fp = fopen(argv[2], "wb");
if (fp == NULL) {
fputs("output file open error\n", stderr);
lua_close(s);
return 1;
}
if (fwrite(header, 1, 44, fp) != 44) {
fputs("output file write error\n", stderr);
fclose(fp);
lua_close(s);
return 1;
}
for (sample = 1; sample <= sample_num; sample++) {
for (channel = 1; channel <= channel_num; channel++) {
double value;
unsigned char data[2];
int v;
lua_geti(s, channel + 1, sample);
value = luaL_checknumber(s, -1);
if (value < -1.0) value = -1.0;
if (value > 1.0) value = 1.0;
lua_pop(s, 1);
if (bit_per_sample == 8) {
v = (int)(value * 128 + 128);
if (v < 0) v = 0;
if (v > 255) v = 255;
data[0] = (unsigned char)v;
if (fwrite(data, 1, 1, fp) != 1) {
fputs("output file write error\n", stderr);
fclose(fp);
lua_close(s);
return 1;
}
} else if (bit_per_sample == 16) {
v = (int)(value * 32768);
if (v < -32768) v = -32768;
if (v > 32767) v = 32767;
setData(data, v, 2);
if (fwrite(data, 1, 2, fp) != 2) {
fputs("output file write error\n", stderr);
fclose(fp);
lua_close(s);
return 1;
}
}
}
}
fclose(fp);
}
lua_pop(s, channel_num + 1);
} else {
lua_pop(s, lua_gettop(s));
}
lua_close(s);
return 0;
}