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/* Simple example of using SoX libraries
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* |
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* Copyright (c) 2007-14 robs@users.sourceforge.net |
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* |
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* This program is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License as published by the |
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* Free Software Foundation; either version 2 of the License, or (at your |
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* option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, but |
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* WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General |
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* Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License along |
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* with this program; if not, write to the Free Software Foundation, Inc., |
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
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*/ |
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#ifdef NDEBUG /* N.B. assert used with active statements so enable always. */ |
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#undef NDEBUG /* Must undef above assert.h or other that might include it. */ |
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#endif |
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#include "sox.h" |
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#include "util.h" |
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#include <stdio.h> |
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#include <assert.h> |
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/*
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* Shows how to explicitly specify output file signal and encoding attributes. |
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*
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* The example converts a given input file of any type to mono mu-law at 8kHz |
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* sampling-rate (providing that this is supported by the given output file |
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* type). |
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* |
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* For example: |
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* |
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* sox -r 16k -n input.wav synth 8 sin 0:8k sin 8k:0 gain -1 |
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* ./example6 input.wav output.wav |
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* soxi input.wav output.wav |
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* |
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* gives: |
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* |
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* Input File : 'input.wav' |
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* Channels : 2 |
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* Sample Rate : 16000 |
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* Precision : 32-bit |
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* Duration : 00:00:08.00 = 128000 samples ~ 600 CDDA sectors |
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* File Size : 1.02M |
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* Bit Rate : 1.02M |
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* Sample Encoding: 32-bit Signed Integer PCM |
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* |
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* Input File : 'output.wav' |
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* Channels : 1 |
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* Sample Rate : 8000 |
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* Precision : 14-bit |
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* Duration : 00:00:08.00 = 64000 samples ~ 600 CDDA sectors |
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* File Size : 64.1k |
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* Bit Rate : 64.1k |
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* Sample Encoding: 8-bit u-law |
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*/ |
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int main(int argc, char * argv[]) |
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{ |
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static sox_format_t * in, * out; /* input and output files */ |
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sox_effects_chain_t * chain; |
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sox_effect_t * e; |
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char * args[10]; |
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sox_signalinfo_t interm_signal; /* @ intermediate points in the chain. */ |
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sox_encodinginfo_t out_encoding = { |
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SOX_ENCODING_ULAW, |
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8, |
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0, |
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sox_option_default, |
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sox_option_default, |
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sox_option_default, |
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sox_false |
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}; |
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sox_signalinfo_t out_signal = { |
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8000, |
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1, |
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0, |
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0, |
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NULL |
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}; |
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assert(argc == 3); |
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assert(sox_init() == SOX_SUCCESS); |
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assert((in = sox_open_read(argv[1], NULL, NULL, NULL))); |
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assert((out = sox_open_write(argv[2], &out_signal, &out_encoding, NULL, NULL, NULL))); |
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chain = sox_create_effects_chain(&in->encoding, &out->encoding); |
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interm_signal = in->signal; /* NB: deep copy */ |
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e = sox_create_effect(sox_find_effect("input")); |
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args[0] = (char *)in, assert(sox_effect_options(e, 1, args) == SOX_SUCCESS); |
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assert(sox_add_effect(chain, e, &interm_signal, &in->signal) == SOX_SUCCESS); |
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free(e); |
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if (in->signal.rate != out->signal.rate) { |
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e = sox_create_effect(sox_find_effect("rate")); |
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assert(sox_effect_options(e, 0, NULL) == SOX_SUCCESS); |
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assert(sox_add_effect(chain, e, &interm_signal, &out->signal) == SOX_SUCCESS); |
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free(e); |
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} |
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if (in->signal.channels != out->signal.channels) { |
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e = sox_create_effect(sox_find_effect("channels")); |
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assert(sox_effect_options(e, 0, NULL) == SOX_SUCCESS); |
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assert(sox_add_effect(chain, e, &interm_signal, &out->signal) == SOX_SUCCESS); |
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free(e); |
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} |
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e = sox_create_effect(sox_find_effect("output")); |
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args[0] = (char *)out, assert(sox_effect_options(e, 1, args) == SOX_SUCCESS); |
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assert(sox_add_effect(chain, e, &interm_signal, &out->signal) == SOX_SUCCESS); |
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free(e); |
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sox_flow_effects(chain, NULL, NULL); |
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sox_delete_effects_chain(chain); |
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sox_close(out); |
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sox_close(in); |
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sox_quit(); |
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return 0; |
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} |
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