115 lines
5.0 KiB
C
115 lines
5.0 KiB
C
/* SoX Resampler Library Copyright (c) 2007-16 robs@users.sourceforge.net
|
|
* Licence for this file: LGPL v2.1 See LICENCE for details. */
|
|
|
|
/* Example 3: extends example 2 with multiple channels, multiple datatypes,
|
|
* and other options.
|
|
*
|
|
* The application provides an input function, called on demand by libsoxr, in
|
|
* response to calls to soxr_output(); compared to the `process' approach
|
|
* (illustrated in example 2) this requires that the application implements
|
|
* less logic, but one more function.
|
|
*
|
|
* The 11 arguments (which are optional, from last to first) are:
|
|
* INPUT-RATE As example 2
|
|
* OUTPUT-RATE Ditto
|
|
* NUM-CHANNELS Number of interleaved channels
|
|
* IN-DATATYPE# 0:float32 1:float64 2:int32 3:int16
|
|
* OUT-DATATYPE# Ditto; or 11 for un-dithered int16
|
|
* Q-RECIPE Quality recipe (in hex) See soxr.h
|
|
* Q-FLAGS Quality flags (in hex) See soxr.h
|
|
* PASSBAND-END %
|
|
* STOPBAND-BEGIN %
|
|
* PHASE-RESPONSE [0,100]
|
|
* USE-THREADS 1 to use multi-threading (where available)
|
|
*/
|
|
|
|
#include <soxr.h>
|
|
#include "examples-common.h"
|
|
|
|
typedef struct {void * ibuf; size_t isize;} input_context_t;
|
|
|
|
static size_t input_fn(input_context_t * p, soxr_cbuf_t * buf, size_t len)
|
|
{
|
|
/* Read one block into the buffer, ready to be input to the resampler: */
|
|
len = fread(p->ibuf, p->isize, len, stdin); /* Actual len read may be less. */
|
|
|
|
/* Inform the resampler of the data's whereabouts (which could be anywhere, in
|
|
* a freshly malloc'd buffer, for example): */
|
|
*buf = (!len && ferror(stdin))? NULL : p->ibuf; /* NULL if error occurred. */
|
|
|
|
return len; /* # of samples per channel to input. */
|
|
}
|
|
|
|
int main(int n, char const * arg[])
|
|
{
|
|
char const * const arg0 = n? --n, *arg++ : "", * engine = "";
|
|
double const irate = n? --n, atof(*arg++) : 96000.;
|
|
double const orate = n? --n, atof(*arg++) : 44100.;
|
|
unsigned const chans = n? --n, (unsigned)atoi(*arg++) : 1;
|
|
soxr_datatype_t const itype = n? --n, (soxr_datatype_t)atoi(*arg++) : 0;
|
|
unsigned const ospec = n? --n, (soxr_datatype_t)atoi(*arg++) : 0;
|
|
unsigned long const q_recipe= n? --n, strtoul(*arg++, 0, 16) : SOXR_HQ;
|
|
unsigned long const q_flags = n? --n, strtoul(*arg++, 0, 16) : 0;
|
|
double const passband_end = n? --n, atof(*arg++) : 0;
|
|
double const stopband_begin = n? --n, atof(*arg++) : 0;
|
|
double const phase_response = n? --n, atof(*arg++) : -1;
|
|
int const use_threads = n? --n, atoi(*arg++) : 1;
|
|
soxr_datatype_t const otype = ospec & 3;
|
|
|
|
soxr_quality_spec_t q_spec = soxr_quality_spec(q_recipe, q_flags);
|
|
soxr_io_spec_t io_spec = soxr_io_spec(itype, otype);
|
|
soxr_runtime_spec_t const runtime_spec = soxr_runtime_spec(!use_threads);
|
|
|
|
/* Allocate resampling input and output buffers in proportion to the input
|
|
* and output rates: */
|
|
#define buf_total_len 15000 /* In samples per channel. */
|
|
size_t const osize = soxr_datatype_size(otype) * chans;
|
|
size_t const isize = soxr_datatype_size(itype) * chans;
|
|
size_t const olen0= (size_t)(orate * buf_total_len / (irate + orate) + .5);
|
|
size_t const olen = min(max(olen0, 1), buf_total_len - 1);
|
|
size_t const ilen = buf_total_len - olen;
|
|
void * const obuf = malloc(osize * olen);
|
|
void * const ibuf = malloc(isize * ilen);
|
|
|
|
input_context_t icontext;
|
|
size_t odone, clips = 0;
|
|
soxr_error_t error;
|
|
soxr_t soxr;
|
|
|
|
/* Overrides (if given): */
|
|
if (passband_end > 0) q_spec.passband_end = passband_end / 100;
|
|
if (stopband_begin > 0) q_spec.stopband_begin = stopband_begin / 100;
|
|
if (phase_response >=0) q_spec.phase_response = phase_response;
|
|
io_spec.flags = ospec & ~7u;
|
|
|
|
/* Create a stream resampler: */
|
|
soxr = soxr_create(
|
|
irate, orate, chans, /* Input rate, output rate, # of channels. */
|
|
&error, /* To report any error during creation. */
|
|
&io_spec, &q_spec, &runtime_spec);
|
|
|
|
if (!error) { /* Register input_fn with the resampler: */
|
|
icontext.ibuf = ibuf, icontext.isize = isize;
|
|
error = soxr_set_input_fn(soxr, (soxr_input_fn_t)input_fn, &icontext, ilen);
|
|
}
|
|
|
|
if (!error) { /* If all is well, run the resampler: */
|
|
engine = soxr_engine(soxr);
|
|
USE_STD_STDIO;
|
|
/* Resample in blocks: */
|
|
do odone = soxr_output(soxr, obuf, olen);
|
|
while (fwrite(obuf, osize, odone, stdout)); /* Consume output. */
|
|
|
|
error = soxr_error(soxr); /* Check if any soxr error occurred. */
|
|
clips = *soxr_num_clips(soxr); /* Can occur only with integer output. */
|
|
}
|
|
/* Tidy up: */
|
|
soxr_delete(soxr);
|
|
free(obuf), free(ibuf);
|
|
/* Diagnostics: */
|
|
fprintf(stderr, "%-26s %s; %lu clips; I/O: %s (%s)\n",
|
|
arg0, soxr_strerror(error), (long unsigned)clips,
|
|
ferror(stdin) || ferror(stdout)? strerror(errno) : "no error", engine);
|
|
return !!error;
|
|
}
|