rtbuf/rtbuf/rtbuf_portaudio_output.c

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• Hash : 17752a6c
  Author : Thomas de Grivel
  Date : 2020-03-04T14:03:48
  

  Downgrade to C89 = ANSI C
  

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• rtbuf_portaudio_output.c

• /*
   * Copyright 2018 Thomas de Grivel <thoxdg@gmail.com> +33614550127
   *
   * Permission to use, copy, modify, and distribute this software for any
   * purpose with or without fee is hereby granted, provided that the above
   * copyright notice and this permission notice appear in all copies.
   *
   * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
   * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
   * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
   * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
   * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
   * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
   */
  
  #include <limits.h>
  #include <portaudio.h>
  #include <stdio.h>
  #include <strings.h>
  #include "rtbuf.h"
  #include "rtbuf_portaudio.h"
  
  int g_initialized = 0;
  
  int rtbuf_portaudio_output_start (s_rtbuf *rtb)
  {
    s_rtbuf_portaudio_output_data *data;
    PaError err;
    assert(rtb->proc->out_bytes == sizeof(*data));
    data = (s_rtbuf_portaudio_output_data*) rtb->data;
    if (!g_initialized) {
      if (Pa_Initialize() != paNoError)
        return rtbuf_err("portaudio_output_start: Pa_Initialize() failed");
      g_initialized = 1;
    }
    err = Pa_OpenDefaultStream(&data->reserved.stream,    /* stream pointer */
                               0,                         /* input channels */
                               RTBUF_PORTAUDIO_CHANNELS,  /* output channels */
                               paInt16,                   /* sample format */
                               RTBUF_SIGNAL_SAMPLERATE,   /* sample rate */
                               RTBUF_SIGNAL_SAMPLES,      /* frames per buffer */
                               NULL,                      /* stream callback */
                               NULL);                     /* user data */
    if (err != paNoError) {
      rtbuf_err(Pa_GetErrorText(err));
      return rtbuf_err("portaudio_output_start: Pa_OpenDefaultStream() failed");
    }
    err = Pa_StartStream(data->reserved.stream);
    if (err != paNoError) {
      rtbuf_err(Pa_GetErrorText(err));
      return rtbuf_err("portaudio output start: Pa_StartStream() failed");
    }
    return 0;
  }
  
  int rtbuf_portaudio_output_stop (s_rtbuf *rtb)
  {
    s_rtbuf_portaudio_output_data *data;
    data = (s_rtbuf_portaudio_output_data*) rtb->data;
    if (data->reserved.stream) {
      Pa_StopStream(data->reserved.stream);
      Pa_CloseStream(data->reserved.stream);
      data->reserved.stream = 0;
    }
    return 0;
  }
  
  int rtbuf_portaudio_output (s_rtbuf *rtb)
  {
    s_rtbuf_signal_fun in[RTBUF_PORTAUDIO_CHANNELS];
    s_rtbuf_portaudio_output_data *data;
    short *sample;
    unsigned int i = 0;
    unsigned int j = 0;
    PaError err;
    assert(rtb);
    assert(rtb->data);
    assert(rtb->proc);
    while (j < RTBUF_PORTAUDIO_CHANNELS) {
      rtbuf_signal_fun(rtb, j, &in[j]);
      j++;
    }
    data = (s_rtbuf_portaudio_output_data*) rtb->data;
    sample = data->samples;
    /* printf("portaudio_output"); */
    while (i < RTBUF_SIGNAL_SAMPLES) {
      j = 0;
      while (j < RTBUF_PORTAUDIO_CHANNELS) {
        double in_ = in[j].sample_fun(in[j].signal, i);
        in_ = clamp(-1.0, in_, 1.0);
        if (in_ < 0.0)
          in_ *= -SHRT_MIN;
        else
          in_ *= SHRT_MAX;
        *sample = (short) in_;
        sample++;
        j++;
      }
      i++;
    }
    err = Pa_WriteStream(data->reserved.stream, data->samples, RTBUF_SIGNAL_SAMPLES);
    if (err != paNoError) {
      rtbuf_err(Pa_GetErrorText(err));
      rtbuf_err("portaudio output: Pa_WriteStream failed");
    }
    /* printf("\n"); */
    return 0;
  }
  

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