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https://github.com/cookiengineer/audacity
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86 lines
2.7 KiB
C
86 lines
2.7 KiB
C
/* SoX Resampler Library Copyright (c) 2007-12 robs@users.sourceforge.net
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* Licence for this file: LGPL v2.1 See LICENCE for details. */
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/* Example 3b: extends example 2b with multiple channels, multiple datatypes,
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* and other options.
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*
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* The eight arguments are:
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* INPUT-RATE As example 2b
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* OUTPUT-RATE Ditto
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* NUM-CHANNELS Number of interleaved channels
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* IN-DATATYPE# 0:float32 1:float64 2:int32 3:int16
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* OUT-DATATYPE# Ditto
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* Q-RECIPE Quality recipe (in hex) See soxr.h
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* Q-FLAGS Quality flags (in hex) See soxr.h
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* USE-THREADS 1 to use multi-threading
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*/
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#include <soxr.h>
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#include "examples-common.h"
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#define iolen 8000
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static size_t input_fn(void * p, soxr_cbuf_t * buf, size_t len)
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{
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static float * ibuf;
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size_t isize = *(size_t *)p;
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len = min(len, iolen);
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*buf = ibuf = realloc(ibuf, isize * len);
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if (!ibuf)
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return 0;
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len = fread(ibuf, isize, len, stdin);
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if (!len) {
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if (ferror(stdin))
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*buf = 0;
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free(ibuf), ibuf = 0;
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}
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return len;
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}
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int main(int n, char const * arg[])
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{
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char const * arg0 = n? --n, *arg++ : "";
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double irate = n? --n, atof(*arg++) : 96000.;
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double orate = n? --n, atof(*arg++) : 44100.;
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unsigned chans = n? --n, (unsigned)atoi(*arg++) : 1;
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soxr_datatype_t itype = n? --n, (soxr_datatype_t)atoi(*arg++) :SOXR_FLOAT32_I;
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soxr_datatype_t otype = n? --n, (soxr_datatype_t)atoi(*arg++) :SOXR_FLOAT32_I;
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unsigned long q_recipe= n? --n, strtoul(*arg++, 0, 16) : SOXR_HQ;
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unsigned long q_flags = n? --n, strtoul(*arg++, 0, 16) : 0;
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int use_threads = n? --n, atoi(*arg++) : 1;
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size_t isize = soxr_datatype_size(itype) * chans;
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size_t osize = soxr_datatype_size(otype) * chans;
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size_t clips = 0;
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soxr_error_t error;
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soxr_quality_spec_t q_spec = soxr_quality_spec(q_recipe, q_flags);
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soxr_io_spec_t io_spec = soxr_io_spec(itype, otype);
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soxr_runtime_spec_t runtime_spec = soxr_runtime_spec(!use_threads);
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soxr_t resampler = soxr_create(
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irate, orate, chans, &error, &io_spec, &q_spec, &runtime_spec);
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if (!error) error = soxr_set_input_fn(resampler, input_fn, &isize);
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USE_STD_STDIO;
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if (!error) {
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void * resampled = malloc(osize * iolen);
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size_t actual;
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do actual = soxr_output(resampler, resampled, iolen);
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while (fwrite(resampled, osize, actual, stdout));
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free(resampled);
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error = soxr_error(resampler);
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clips = *soxr_num_clips(resampler); /* Can occur only with integer output.*/
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soxr_delete(resampler);
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}
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fprintf(stderr, "%-26s %s; %lu clips; I/O: %s\n", arg0, soxr_strerror(error),
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(long unsigned)clips, errno? strerror(errno) : "no error");
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return error || errno;
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}
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