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smartnet_wavfile.cc
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smartnet_wavfile.cc
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/* -*- c++ -*- */
/*
* Copyright 2004,2008 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
* GNU Radio is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3, or (at your option)
* any later version.
*
* GNU Radio is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU Radio; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "smartnet_wavfile.h"
#include <cstring>
#include <stdint.h>
# define VALID_COMPRESSION_TYPE 0x0001
// WAV files are always little-endian, so we need some byte switching macros
// FIXME: Use libgruel versions
#ifdef WORDS_BIGENDIAN
#ifdef HAVE_BYTESWAP_H
#include <byteswap.h>
#else
#warning Using non-portable code (likely wrong other than ILP32).
static inline short int
bswap_16 (unsigned short int x)
{
return ((((x) >> 8) & 0xff) | (((x) & 0xff) << 8));
}
static inline unsigned int
bswap_32 (unsigned int x)
{
return ((((x) & 0xff000000) >> 24) | (((x) & 0x00ff0000) >> 8) \
| (((x) & 0x0000ff00) << 8) | (((x) & 0x000000ff) << 24));
}
#endif // HAVE_BYTESWAP_H
static inline uint32_t
host_to_wav(uint32_t x)
{
return bswap_32(x);
}
static inline uint16_t
host_to_wav(uint16_t x)
{
return bswap_16(x);
}
static inline int16_t
host_to_wav(int16_t x)
{
return bswap_16(x);
}
static inline uint32_t
wav_to_host(uint32_t x)
{
return bswap_32(x);
}
static inline uint16_t
wav_to_host(uint16_t x)
{
return bswap_16(x);
}
static inline int16_t
wav_to_host(int16_t x)
{
return bswap_16(x);
}
#else
static inline uint32_t
host_to_wav(uint32_t x)
{
return x;
}
static inline uint16_t
host_to_wav(uint16_t x)
{
return x;
}
static inline int16_t
host_to_wav(int16_t x)
{
return x;
}
static inline uint32_t
wav_to_host(uint32_t x)
{
return x;
}
static inline uint16_t
wav_to_host(uint16_t x)
{
return x;
}
static inline int16_t
wav_to_host(int16_t x)
{
return x;
}
#endif // WORDS_BIGENDIAN
bool
smartnet_wavheader_parse(FILE *fp,
unsigned int &sample_rate_o,
int &nchans_o,
int &bytes_per_sample_o,
int &first_sample_pos_o,
unsigned int &samples_per_chan_o)
{
// _o variables take return values
char str_buf[8] = {0};
uint32_t file_size;
uint32_t fmt_hdr_skip;
uint16_t compression_type;
uint16_t nchans;
uint32_t sample_rate;
uint32_t avg_bytes_per_sec;
uint16_t block_align;
uint16_t bits_per_sample;
uint32_t chunk_size;
size_t fresult;
fresult = fread(str_buf, 1, 4, fp);
if (fresult != 4 || strncmp(str_buf, "RIFF", 4) || feof(fp)) {
return false;
}
fresult = fread(&file_size, 1, 4, fp);
fresult = fread(str_buf, 1, 8, fp);
if (fresult != 8 || strncmp(str_buf, "WAVEfmt ", 8) || feof(fp)) {
return false;
}
fresult = fread(&fmt_hdr_skip, 1, 4, fp);
fresult = fread(&compression_type, 1, 2, fp);
if (wav_to_host(compression_type) != VALID_COMPRESSION_TYPE) {
return false;
}
fresult = fread(&nchans, 1, 2, fp);
fresult = fread(&sample_rate, 1, 4, fp);
fresult = fread(&avg_bytes_per_sec, 1, 4, fp);
fresult = fread(&block_align, 1, 2, fp);
fresult = fread(&bits_per_sample, 1, 2, fp);
if (ferror(fp)) {
return false;
}
fmt_hdr_skip = wav_to_host(fmt_hdr_skip);
nchans = wav_to_host(nchans);
sample_rate = wav_to_host(sample_rate);
bits_per_sample = wav_to_host(bits_per_sample);
if (bits_per_sample != 8 && bits_per_sample != 16) {
return false;
}
fmt_hdr_skip -= 16;
if (fmt_hdr_skip) {
fseek(fp, fmt_hdr_skip, SEEK_CUR);
}
// data chunk
fresult = fread(str_buf, 1, 4, fp);
if (strncmp(str_buf, "data", 4)) {
return false;
}
fresult = fread(&chunk_size, 1, 4, fp);
if (ferror(fp)) {
return false;
}
// More byte swapping
chunk_size = wav_to_host(chunk_size);
// Output values
sample_rate_o = (unsigned) sample_rate;
nchans_o = (int) nchans;
bytes_per_sample_o = (int) (bits_per_sample / 8);
first_sample_pos_o = (int) ftell(fp);
samples_per_chan_o = (unsigned) (chunk_size / (bytes_per_sample_o * nchans));
return true;
}
short int
smartnet_wav_read_sample(FILE *fp, int bytes_per_sample)
{
int16_t buf = 0;
size_t fresult;
fresult = fread(&buf, bytes_per_sample, 1, fp);
return (short) wav_to_host(buf);
}
bool
smartnet_wavheader_write(FILE *fp,
unsigned int sample_rate,
int nchans,
int bytes_per_sample)
{
const int header_len = 44;
char wav_hdr[header_len] = "RIFF\0\0\0\0WAVEfmt \0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0data\0\0\0";
uint16_t nchans_f = (uint16_t) nchans;
uint32_t sample_rate_f = (uint32_t) sample_rate;
uint16_t block_align = bytes_per_sample * nchans;
uint32_t avg_bytes = sample_rate * block_align;
uint16_t bits_per_sample = bytes_per_sample * 8;
nchans_f = host_to_wav(nchans_f);
sample_rate_f = host_to_wav(sample_rate_f);
block_align = host_to_wav(block_align);
avg_bytes = host_to_wav(avg_bytes);
bits_per_sample = host_to_wav(bits_per_sample);
wav_hdr[16] = 0x10; // no extra bytes
wav_hdr[20] = 0x01; // no compression
memcpy((void *) (wav_hdr + 22), (void *) &nchans_f, 2);
memcpy((void *) (wav_hdr + 24), (void *) &sample_rate_f, 4);
memcpy((void *) (wav_hdr + 28), (void *) &avg_bytes, 4);
memcpy((void *) (wav_hdr + 32), (void *) &block_align, 2);
memcpy((void *) (wav_hdr + 34), (void *) &bits_per_sample, 2);
fwrite(&wav_hdr, 1, header_len, fp);
if (ferror(fp)) {
return false;
}
return true;
}
void
smartnet_wav_write_sample(FILE *fp, short int sample, int bytes_per_sample)
{
void *data_ptr;
unsigned char buf_8bit;
int16_t buf_16bit;
if (bytes_per_sample == 1) {
buf_8bit = (unsigned char) sample;
data_ptr = (void *) &buf_8bit;
} else {
buf_16bit = host_to_wav((int16_t) sample);
data_ptr = (void *) &buf_16bit;
}
fwrite(data_ptr, 1, bytes_per_sample, fp);
}
bool
smartnet_wavheader_complete(FILE *fp, unsigned int byte_count)
{
uint32_t chunk_size = (uint32_t) byte_count;
chunk_size = host_to_wav(chunk_size);
fseek(fp, 40, SEEK_SET);
fwrite(&chunk_size, 1, 4, fp);
chunk_size = (uint32_t) byte_count + 36; // fmt chunk and data header
chunk_size = host_to_wav(chunk_size);
fseek(fp, 4, SEEK_SET);
fwrite(&chunk_size, 1, 4, fp);
if (ferror(fp)) {
return false;
}
return true;
}