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List:       sox-users
Subject:    Re: [SoX-users] Question about reducing a channel from wav programmaticaly?
From:       William Mortimore <wm () keystoneinsights ! com>
Date:       2011-11-06 18:16:50
Message-ID: 32788692.post () talk ! nabble ! com
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Did you ever get a response to this post. I recently posted the same
question/problem and have gotten no answer yet.


xldelg wrote:
> 
> hi,
> 
> I'm new to libsox programming, and I want to reduce a chennel from a
> stereo audio which named 'a.wav' then generate a mono audio 'b.wav' with
> the following code:
> ------------------------------------------------------------------------------------------------------------
>  sox_format_t * in, * out; 
> sox_effects_chain_t * chain;
> sox_effect_t * e;
> char * args[10];
> 
> sox_init();
> in = sox_open_read("E:\\a.wav", NULL, NULL, NULL);
> out = sox_open_write("E:\\b.wav", &in->signal, NULL, NULL, NULL, NULL);
> out->signal.channels = 1;
> 
> chain = sox_create_effects_chain(&in->encoding, &out->encoding);
> e = sox_create_effect(sox_find_effect("input"));
> sox_add_effect(chain, e, &in->signal, &in->signal);
> 
> e = sox_create_effect(sox_find_effect("channels"));
> sox_add_effect(chain, e, &in->signal, &out->signal);
> 
> e = sox_create_effect(sox_find_effect("output"));
> sox_add_effect(chain, e, &in->signal, &out->signal);
> 
> sox_flow_effects(chain, NULL, NULL);
> sox_delete_effects_chain(chain);
> sox_close(out);
> sox_close(in);
> sox_format_quit();
> -----------------------------------------------------------------------------------------------------------
>  After running the application, the mono audio 'b.wav' was generated, but
> the duration of the sound was half of the a.wav.
> Is there something wrong with my code?
> 
> Any reply will be appreciated!
> 
> 2009-12-01 
> 
> 
> 
> John
> 
> ------------------------------------------------------------------------------
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