ref: 30fb06fc90b69afaa38534e6ffd0a7c66fe0d3d9
dir: /src/io/sink_wavwrite.c/
/*
Copyright (C) 2014 Paul Brossier <piem@aubio.org>
This file is part of aubio.
aubio 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 of the License, or
(at your option) any later version.
aubio 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 aubio. If not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#ifdef HAVE_WAVWRITE
#include "aubio_priv.h"
#include "sink_wavwrite.h"
#include "fvec.h"
#include <errno.h>
#define MAX_CHANNELS 6
#define MAX_SIZE 4096
#define FLOAT_TO_SHORT(x) (short)(x * 32768)
// swap endian of a short
#define SWAPS(x) ((x & 0xff) << 8) | ((x & 0xff00) >> 8)
// swap host to little endian
#if defined(__BYTE_ORDER__) && (__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__)
#define HTOLES(x) SWAPS(x)
#elif defined(__BYTE_ORDER__) && (__BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__)
#define HTOLES(x) x
#else
#define HTOLES(x) SWAPS(htons(x))
#endif
struct _aubio_sink_wavwrite_t {
char_t *path;
uint_t samplerate;
uint_t channels;
uint_t bitspersample;
uint_t total_frames_written;
FILE *fid;
uint_t max_size;
uint_t scratch_size;
unsigned short *scratch_data;
};
unsigned char *write_little_endian (unsigned int s, unsigned char *str, unsigned int length);
unsigned char *write_little_endian (unsigned int s, unsigned char *str, unsigned int length) {
uint_t i;
for (i = 0; i < length; i++) {
str[i] = s >> (i * 8);
}
return str;
}
aubio_sink_wavwrite_t * new_aubio_sink_wavwrite(char_t * path, uint_t samplerate) {
aubio_sink_wavwrite_t * s = AUBIO_NEW(aubio_sink_wavwrite_t);
unsigned char buf[5];
uint_t byterate, blockalign;
if (path == NULL) {
AUBIO_ERR("sink_wavwrite: Aborted opening null path\n");
goto beach;
}
if ((sint_t)samplerate < 0) {
AUBIO_ERR("sink_wavwrite: Can not create %s with samplerate %d\n", path, samplerate);
goto beach;
}
s->path = path;
s->samplerate = samplerate;
s->max_size = MAX_SIZE;
s->channels = 1;
s->bitspersample = 16;
s->total_frames_written = 0;
/* set output format */
s->fid = fopen((const char *)path, "wb");
if (!s->fid) {
AUBIO_ERR("sink_wavwrite: could not open %s (%s)\n", s->path, strerror(errno));
goto beach;
}
// ChunkID
fwrite("RIFF", 4, 1, s->fid);
// ChunkSize (0 for now, actual size will be written in _close)
fwrite(write_little_endian(0, buf, 4), 4, 1, s->fid);
// Format
fwrite("WAVE", 4, 1, s->fid);
// Subchunk1ID
fwrite("fmt ", 4, 1, s->fid);
// Subchunk1Size
fwrite(write_little_endian(16, buf, 4), 4, 1, s->fid);
// AudioFormat
fwrite(write_little_endian(1, buf, 2), 2, 1, s->fid);
// NumChannels
fwrite(write_little_endian(s->channels, buf, 2), 2, 1, s->fid);
// SampleRate
fwrite(write_little_endian(s->samplerate, buf, 4), 4, 1, s->fid);
// ByteRate
byterate = s->samplerate * s->channels * s->bitspersample / 8;
fwrite(write_little_endian(byterate, buf, 4), 4, 1, s->fid);
// BlockAlign
blockalign = s->channels * s->bitspersample / 8;
fwrite(write_little_endian(blockalign, buf, 2), 2, 1, s->fid);
// BitsPerSample
fwrite(write_little_endian(s->bitspersample, buf, 2), 2, 1, s->fid);
// Subchunk2ID
fwrite("data", 4, 1, s->fid);
// Subchunk1Size (0 for now, actual size will be written in _close)
fwrite(write_little_endian(0, buf, 4), 4, 1, s->fid);
s->scratch_size = s->max_size * s->channels;
/* allocate data for de/interleaving reallocated when needed. */
if (s->scratch_size >= MAX_SIZE * MAX_CHANNELS) {
AUBIO_ERR("sink_wavwrite: %d x %d exceeds maximum buffer size %d\n",
s->max_size, s->channels, MAX_CHANNELS * MAX_CHANNELS);
AUBIO_FREE(s);
return NULL;
}
s->scratch_data = AUBIO_ARRAY(unsigned short,s->scratch_size);
return s;
beach:
//AUBIO_ERR("sink_wavwrite: failed creating %s with samplerate %dHz\n",
// s->path, s->samplerate);
del_aubio_sink_wavwrite(s);
return NULL;
}
void aubio_sink_wavwrite_do(aubio_sink_wavwrite_t *s, fvec_t * write_data, uint_t write){
uint_t i = 0, written_frames = 0;
if (write > s->max_size) {
AUBIO_WRN("sink_wavwrite: trying to write %d frames to %s, "
"but only %d can be written at a time\n", write, s->path, s->max_size);
write = s->max_size;
}
for (i = 0; i < write; i++) {
s->scratch_data[i] = HTOLES(FLOAT_TO_SHORT(write_data->data[i]));
}
written_frames = fwrite(s->scratch_data, 2, write, s->fid);
if (written_frames != write) {
AUBIO_WRN("sink_wavwrite: trying to write %d frames to %s, "
"but only %d could be written\n", write, s->path, written_frames);
}
s->total_frames_written += written_frames;
return;
}
uint_t aubio_sink_wavwrite_close(aubio_sink_wavwrite_t * s) {
uint_t data_size = s->total_frames_written * s->bitspersample * s->channels / 8;
unsigned char buf[5];
if (!s->fid) return AUBIO_FAIL;
// ChunkSize
fseek(s->fid, 4, SEEK_SET);
fwrite(write_little_endian(data_size + 36, buf, 4), 4, 1, s->fid);
// Subchunk2Size
fseek(s->fid, 40, SEEK_SET);
fwrite(write_little_endian(data_size, buf, 4), 4, 1, s->fid);
// close file
if (fclose(s->fid)) {
AUBIO_ERR("sink_wavwrite: Error closing file %s (%s)\n", s->path, strerror(errno));
}
s->fid = NULL;
return AUBIO_OK;
}
void del_aubio_sink_wavwrite(aubio_sink_wavwrite_t * s){
if (!s) return;
aubio_sink_wavwrite_close(s);
AUBIO_FREE(s->scratch_data);
AUBIO_FREE(s);
}
#endif /* HAVE_WAVWRITE */