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/*
* lib.c
*
* Contains some basic functions for reading and writing files
*
* $Id: lib.c,v 1.5 2014/02/02 12:10:47 gert Exp $
*
*/
#include "../include/voice.h"
rmd_header init_rmd_header = {"RMD1", "", 0x0000, 0, 0, {0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00}};
state_t init_state = {0x0000, 0};
int bitmask[17] = {0x0000, 0x0001, 0x0003, 0x0007, 0x000f, 0x001f, 0x003f,
0x007f, 0x00ff, 0x01ff, 0x03ff, 0x07ff, 0x0fff, 0x1fff, 0x3fff, 0x7fff,
0xffff};
int read_bits (FILE *fd_in, state_t *state, int nbits)
{
static int data_new;
while(state->nleft < nbits)
{
if ((data_new = getc(fd_in)) == EOF)
return(EOF);
state->data = (state->data << 8) | data_new;
state->nleft += 8;
}
state->nleft -= nbits;
return(state->data >> state->nleft) & bitmask[nbits];
}
void write_bits (FILE *fd_out, state_t *state, int nbits, int data)
{
state->data = (state->data << nbits) | (data & bitmask[nbits]);
state->nleft += nbits;
while (state->nleft >= 8)
{
putc((state->data >> (state->nleft - 8)) & 0xff, fd_out);
state->nleft -= 8;
}
}
int read_bits_reverse (FILE *fd_in, state_t *state, int nbits)
{
static int data;
static int data_new;
while(state->nleft < nbits)
{
if ((data_new = getc(fd_in)) != EOF)
return(EOF);
state->data |= (data_new << state->nleft);
state->nleft += 8;
}
data = state->data & bitmask[nbits];
state->nleft -= nbits;
state->data >>= nbits;
return(data);
}
void write_bits_reverse (FILE *fd_out, state_t *state, int nbits, int data)
{
state->data |= ((data & bitmask[nbits]) << state->nleft);
state->nleft += nbits;
while(state->nleft >= 8)
{
putc(state->data & 0xff, fd_out);
state->nleft -= 8;
state->data >>= 8;
}
}
int read_rmd_header(FILE *fd_in, rmd_header *header_in)
{
*header_in = init_rmd_header;
if (fread(header_in, sizeof(rmd_header), 1, fd_in) != 1)
{
fprintf(stderr, "%s: Could not read rmd header\n", program_name);
return(FAIL);
};
if (strncmp(header_in->magic, "RMD1", 4) != 0)
{
fprintf(stderr, "%s: No rmd (raw modem data) header found\n",
program_name);
return(FAIL);
};
return(OK);
}
int write_rmd_header(FILE *fd_out, rmd_header *header_out)
{
if (fwrite(header_out, sizeof(rmd_header), 1, fd_out) != 1)
{
fprintf(stderr, "%s: Could not write rmd header\n", program_name);
return(FAIL);
};
return(OK);
}
static int read_pvf_data_8_ascii(FILE *fd_in)
{
static int data_new;
if (fscanf(fd_in, "%d", &data_new) != 1)
return(EOF);
if (data_new < -0x80)
data_new = -0x80;
if (data_new > 0x7f)
data_new = 0x7f;
return(data_new << 16);
}
static int read_pvf_data_16_ascii(FILE *fd_in)
{
static int data_new;
if (fscanf(fd_in, "%d", &data_new) != 1)
return(EOF);
if (data_new < -0x8000)
data_new = -0x8000;
if (data_new > 0x7fff)
data_new = 0x7fff;
return(data_new << 8);
}
static int read_pvf_data_32_ascii(FILE *fd_in)
{
static int data_new;
if (fscanf(fd_in, "%d", &data_new) != 1)
return(EOF);
return(data_new);
}
static int read_pvf_data_8(FILE *fd_in)
{
static signed char data_new;
if (fread(&data_new, 1, 1, fd_in) != 1)
return(EOF);
return(data_new << 16);
}
static int read_pvf_data_16(FILE *fd_in)
{
static signed short data_new;
if (fread(&data_new, 2, 1, fd_in) != 1)
return(EOF);
data_new = ntohs(data_new);
return(data_new << 8);
}
static int read_pvf_data_32(FILE *fd_in)
{
static int data_new;
if (fread(&data_new, 4, 1, fd_in) != 1)
return(EOF);
return(ntohl(data_new));
}
static void write_pvf_data_8_ascii(FILE *fd_out, int data)
{
data >>= 16;
if (data > 0x7f)
data = 0x7f;
if (data < -0x80)
data = -0x80;
fprintf(fd_out, "%d\n", data);
}
static void write_pvf_data_16_ascii(FILE *fd_out, int data)
{
data >>= 8;
if (data > 0x7fff)
data = 0x7fff;
if (data < -0x8000)
data = -0x8000;
fprintf(fd_out, "%d\n", data);
}
static void write_pvf_data_32_ascii(FILE *fd_out, int data)
{
fprintf(fd_out, "%d\n", data);
}
static void write_pvf_data_8(FILE *fd_out, int data)
{
data >>= 16;
if (data > 0x7f)
data = 0x7f;
if (data < -0x80)
data = -0x80;
putc(data, fd_out);
}
static void write_pvf_data_16(FILE *fd_out, int data)
{
static signed short out;
data >>= 8;
if (data > 0x7fff)
data = 0x7fff;
if (data < -0x8000)
data = -0x8000;
out = htons((short) data);
fwrite(&out, 2, 1, fd_out);
}
static void write_pvf_data_32(FILE *fd_out, int data)
{
static signed int out;
out = htonl((long) data);
fwrite(&out, 4, 1, fd_out);
}
int read_pvf_header(FILE *fd_in, pvf_header *header_in)
{
char buffer[VOICE_BUF_LEN + 1];
int i;
*header_in = init_pvf_header;
if (fread(&buffer, 5, 1, fd_in) != 1)
{
fprintf(stderr, "%s: Could not read pvf header\n", program_name);
return(FAIL);
};
if (strncmp(buffer, "PVF1\n", 5) == 0)
header_in->ascii = FALSE;
else if (strncmp(buffer, "PVF2\n", 5) == 0)
header_in->ascii = TRUE;
else
{
fprintf(stderr, "%s: No pvf (portable voice format) header found\n",
program_name);
return(FAIL);
};
for (i = 0; i < VOICE_BUF_LEN; i++)
{
if (fread(&buffer[i], 1, 1, fd_in) != 1)
{
fprintf(stderr, "%s: Could not read pvf header\n", program_name);
return(FAIL);
};
if (buffer[i] == '\n')
break;
};
buffer[i] = 0x00;
sscanf(buffer, "%d %d %d", &header_in->channels, &header_in->speed,
&header_in->nbits);
if ((header_in->channels < 1) || (32 < header_in->channels))
{
fprintf(stderr, "%s: Invalid number of channels (%d)\n",
program_name, header_in->channels);
return(FAIL);
};
if ((header_in->speed < 0) || (50000 < header_in->speed))
{
fprintf(stderr, "%s: Invalid sample speed (%d)\n", program_name,
header_in->speed);
return(FAIL);
};
if ((header_in->nbits != 8) && (header_in->nbits != 16) &&
(header_in->nbits != 32))
{
fprintf(stderr, "%s: Invalid number of bits (%d) per sample\n",
program_name, header_in->nbits);
return(FAIL);
};
if (header_in->ascii)
{
switch (header_in->nbits)
{
case 8:
header_in->read_pvf_data = &read_pvf_data_8_ascii;
break;
case 16:
header_in->read_pvf_data = &read_pvf_data_16_ascii;
break;
case 32:
header_in->read_pvf_data = &read_pvf_data_32_ascii;
break;
default:
fprintf(stderr, "%s: Illegal bit size for pvf input\n",
program_name);
return(FAIL);
};
}
else
{
switch (header_in->nbits)
{
case 8:
header_in->read_pvf_data = &read_pvf_data_8;
break;
case 16:
header_in->read_pvf_data = &read_pvf_data_16;
break;
case 32:
header_in->read_pvf_data = &read_pvf_data_32;
break;
default:
fprintf(stderr, "%s: Illegal bit size for pvf input\n",
program_name);
return(FAIL);
};
};
return(OK);
}
int write_pvf_header(FILE *fd_out, pvf_header *header_out)
{
char buffer[VOICE_BUF_LEN];
if (header_out->ascii)
{
sprintf(buffer, "PVF2\n%d %d %d\n", header_out->channels,
header_out->speed, header_out->nbits);
switch (header_out->nbits)
{
case 8:
header_out->write_pvf_data = &write_pvf_data_8_ascii;
break;
case 16:
header_out->write_pvf_data = &write_pvf_data_16_ascii;
break;
case 32:
header_out->write_pvf_data = &write_pvf_data_32_ascii;
break;
default:
fprintf(stderr, "%s: Illegal bit size for pvf output\n",
program_name);
return(FAIL);
};
}
else
{
sprintf(buffer, "PVF1\n%d %d %d\n", header_out->channels,
header_out->speed, header_out->nbits);
switch (header_out->nbits)
{
case 8:
header_out->write_pvf_data = &write_pvf_data_8;
break;
case 16:
header_out->write_pvf_data = &write_pvf_data_16;
break;
case 32:
header_out->write_pvf_data = &write_pvf_data_32;
break;
default:
fprintf(stderr, "%s: Illegal bit size for pvf output\n",
program_name);
return(FAIL);
};
};
if (fwrite(&buffer, strlen(buffer), 1, fd_out) != 1)
{
fprintf(stderr, "%s: Could not write pvf header\n", program_name);
return(FAIL);
};
return(OK);
}
pvf_header init_pvf_header = {FALSE, 1, 8000, 32, &read_pvf_data_32,
&write_pvf_data_32};
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