Example #1
0
/*
 * On an alsa capable system, plays an audio file starting 10 seconds in.
 * Copes with sample-rate and channel change if necessary since its
 * common for audio drivers to support a subset of rates and channel
 * counts.
 * E.g. example3 song2.ogg
 *
 * Can easily be changed to work with other audio device drivers supported
 * by libSoX; e.g. "oss", "ao", "coreaudio", etc.
 * See the soxformat(7) manual page.
 */
int main(int argc, char * argv[])
{
  static sox_format_t * in, * out; /* input and output files */
  sox_effects_chain_t * chain;
  sox_effect_t * e;
  sox_signalinfo_t interm_signal;
  char * args[10];

  assert(argc == 2);
  sox_globals.output_message_handler = output_message;
  sox_globals.verbosity = 1;

  assert(sox_init() == SOX_SUCCESS);
  assert(in = sox_open_read(argv[1], NULL, NULL, NULL));
  /* Change "alsa" in this line to use an alternative audio device driver: */
  assert(out= sox_open_write("default", &in->signal, NULL, "alsa", NULL, NULL));

  chain = sox_create_effects_chain(&in->encoding, &out->encoding);

  interm_signal = in->signal; /* NB: deep copy */

  e = sox_create_effect(sox_find_effect("input"));
  args[0] = (char *)in, assert(sox_effect_options(e, 1, args) == SOX_SUCCESS);
  assert(sox_add_effect(chain, e, &interm_signal, &in->signal) == SOX_SUCCESS);
  free(e);

  e = sox_create_effect(sox_find_effect("trim"));
  args[0] = "10", assert(sox_effect_options(e, 1, args) == SOX_SUCCESS);
  assert(sox_add_effect(chain, e, &interm_signal, &in->signal) == SOX_SUCCESS);
  free(e);

  if (in->signal.rate != out->signal.rate) {
    e = sox_create_effect(sox_find_effect("rate"));
    assert(sox_effect_options(e, 0, NULL) == SOX_SUCCESS);
    assert(sox_add_effect(chain, e, &interm_signal, &out->signal) == SOX_SUCCESS);
    free(e);
  }

  if (in->signal.channels != out->signal.channels) {
    e = sox_create_effect(sox_find_effect("channels"));
    assert(sox_effect_options(e, 0, NULL) == SOX_SUCCESS);
    assert(sox_add_effect(chain, e, &interm_signal, &out->signal) == SOX_SUCCESS);
    free(e);
  }

  e = sox_create_effect(sox_find_effect("output"));
  args[0] = (char *)out, assert(sox_effect_options(e, 1, args) == SOX_SUCCESS);
  assert(sox_add_effect(chain, e, &interm_signal, &out->signal) == SOX_SUCCESS);
  free(e);

  sox_flow_effects(chain, NULL, NULL);

  sox_delete_effects_chain(chain);
  sox_close(out);
  sox_close(in);
  sox_quit();

  return 0;
}
Example #2
0
int main(int argc, char** argv) {
    if (argc != 2) {
        fprintf(stderr, "usage: %s input_file > output_file\n", argv[0]);
        exit(1);
    }

    const int out_channels = 2, sample_rate = 44100;

    if (sox_init() != SOX_SUCCESS) {
        oops("sox_init()");
    }

    sox_format_t* input = sox_open_read(argv[1], NULL, NULL, NULL);
    if (!input) {
        oops("sox_open_read()");
    }

    sox_signalinfo_t out_si = {};
    out_si.rate = sample_rate;
    out_si.channels = out_channels;
    out_si.precision = SOX_SAMPLE_PRECISION;

    sox_effect_handler_t out_handler = {
        "stdout", NULL, SOX_EFF_MCHAN, NULL, NULL, stdout_writer, NULL, NULL, NULL, 0
    };

    sox_effects_chain_t* chain
        = sox_create_effects_chain(&input->encoding, NULL);
    if (!chain) {
        oops("sox_create_effects_chain()");
    }

    {
        sox_effect_t* effect = sox_create_effect(sox_find_effect("input"));
        if (!effect) {
            oops("sox_create_effect(input)");
        }

        char* args[1] = { (char*)input };
        if (sox_effect_options(effect, 1, args) != SOX_SUCCESS) {
            oops("sox_effect_options(input)");
        }

        if (sox_add_effect(
                chain, effect, &input->signal, &out_si) != SOX_SUCCESS) {
            oops("sox_add_effect(input)");
        }

        free(effect);
    }

    if (input->signal.rate != out_si.rate) {
        {
            sox_effect_t* effect = sox_create_effect(sox_find_effect("gain"));
            if (!effect) {
                oops("sox_create_effect(gain)");
            }

            const char* args[] = { "-h" };

            if (sox_effect_options(effect, 1, (char**)args) != SOX_SUCCESS) {
                oops("sox_effect_options(gain)");
            }

            if (sox_add_effect(
                    chain, effect, &input->signal, &out_si) != SOX_SUCCESS) {
                oops("sox_add_effect(gain)");
            }

            free(effect);
        }

        {
            sox_effect_t* effect = sox_create_effect(sox_find_effect("rate"));
            if (!effect) {
                oops("sox_create_effect(rate)");
            }

            const char* args[] = { "-Q", "7", "-b", "99.7" };

            if (sox_effect_options(effect, 4, (char**)args) != SOX_SUCCESS) {
                oops("sox_effect_options(rate)");
            }

            if (sox_add_effect(
                    chain, effect, &input->signal, &out_si) != SOX_SUCCESS) {
                oops("sox_add_effect(rate)");
            }

            free(effect);
        }
    }

    if (input->signal.channels != out_si.channels) {
        sox_effect_t* effect = sox_create_effect(sox_find_effect("channels"));
        if (!effect) {
            oops("sox_create_effect(channels)");
        }

        if (sox_effect_options(effect, 0, NULL) != SOX_SUCCESS) {
            oops("sox_effect_options(channels)");
        }

        if (sox_add_effect(
                chain, effect, &input->signal, &out_si) != SOX_SUCCESS) {
            oops("sox_add_effect(channels)");
        }

        free(effect);
    }

    {
        sox_effect_t* effect = sox_create_effect(&out_handler);
        if (!effect) {
            oops("sox_create_effect(output)");
        }

        if (sox_add_effect(
                chain, effect, &input->signal, &out_si) != SOX_SUCCESS) {
            oops("sox_add_effect(output)");
        }

        free(effect);
    }

    sox_flow_effects(chain, NULL, NULL);

    sox_delete_effects_chain(chain);

    if (sox_close(input) != SOX_SUCCESS) {
        oops("sox_close()");
    }

    if (sox_quit() != SOX_SUCCESS) {
        oops("sox_quit()");
    }

    return 0;
}
Example #3
0
/*
 * Reads input file, applies vol & flanger effects, stores in output file.
 * E.g. example1 monkey.au monkey.aiff
 */
int main(int argc, char * argv[]){

	static sox_format_t * in, * out; /* input and output files */
	sox_effects_chain_t * chain;
  	sox_effect_t * e;
  	char * args[10];

  	assert(argc == 3);

  	/* All libSoX applications must start by initialising the SoX library */
  	assert(sox_init() == SOX_SUCCESS);

  	/* Open the input file (with default parameters) */
  	assert(in = sox_open_read(argv[1], NULL, NULL, NULL));

  	/* Open the output file; we must specify the output signal characteristics.
  	* Since we are using only simple effects, they are the same as the input
  	* file characteristics */
  	assert(out = sox_open_write(argv[2], &in->signal, NULL, NULL, NULL, NULL));

  	/* Create an effects chain; some effects need to know about the input
  	* or output file encoding so we provide that information here */
  	chain = sox_create_effects_chain(&in->encoding, &out->encoding);

  	/* The first effect in the effect chain must be something that can source
   	* samples; in this case, we use the built-in handler that inputs
   	* data from an audio file */
  	e = sox_create_effect(sox_find_effect("input"));
  	args[0] = (char *)in, assert(sox_effect_options(e, 1, args) == SOX_SUCCESS);
  	/* This becomes the first `effect' in the chain */
  	assert(sox_add_effect(chain, e, &in->signal, &in->signal) == SOX_SUCCESS);

  	/* Create the `vol' effect, and initialise it with the desired parameters: */
  	e = sox_create_effect(sox_find_effect("vol"));
  	args[0] = "3dB", assert(sox_effect_options(e, 1, args) == SOX_SUCCESS);
  	/* Add the effect to the end of the effects processing chain: */
	assert(sox_add_effect(chain, e, &in->signal, &in->signal) == SOX_SUCCESS);

  	/* Create the `flanger' effect, and initialise it with default parameters: */
  	e = sox_create_effect(sox_find_effect("flanger"));
  	assert(sox_effect_options(e, 0, NULL) == SOX_SUCCESS);
  	/* Add the effect to the end of the effects processing chain: */
  	assert(sox_add_effect(chain, e, &in->signal, &in->signal) == SOX_SUCCESS);

  	/* The last effect in the effect chain must be something that only consumes
  	* samples; in this case, we use the built-in handler that outputs
   	* data to an audio file */
  	e = sox_create_effect(sox_find_effect("output"));
  	args[0] = (char *)out, assert(sox_effect_options(e, 1, args) == SOX_SUCCESS);
  	assert(sox_add_effect(chain, e, &in->signal, &in->signal) == SOX_SUCCESS);

  	/* Flow samples through the effects processing chain until EOF is reached */
  	sox_flow_effects(chain, NULL, NULL);

  	/* All done; tidy up: */
  	sox_delete_effects_chain(chain);
  	sox_close(out);
  	sox_close(in);
  	sox_quit();
  	return 0;
}