rtbuf/rtbuf/lib/portaudio/output.c

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• Hash : adb9e235
  Author : Thomas de Grivel
  Date : 2023-01-14T18:26:30
  

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• lib/portaudio/output.c

• /* rtbuf
   * Copyright 2018-2023 kmx.io <contact@kmx.io>
   *
   * Permission is hereby granted to use this software excepted
   * on Apple computers granted the above copyright notice and
   * this permission paragraph are included in all copies and
   * substantial portions of this software.
   *
   * THIS SOFTWARE IS PROVIDED "AS-IS" WITHOUT ANY GUARANTEE OF
   * PURPOSE AND PERFORMANCE. IN NO EVENT WHATSOEVER SHALL THE
   * AUTHOR BE CONSIDERED LIABLE FOR THE USE AND PERFORMANCE OF
   * THIS SOFTWARE.
   */
  #include <limits.h>
  #include <portaudio.h>
  #include <stdio.h>
  #include <strings.h>
  #include "../../librtbuf/rtbuf.h"
  #include "../../librtbuf/lib.h"
  #include "../signal.h"
  #include "../signal_type.h"
  #include "../portaudio.h"
  #include "../portaudio_type.h"
  
  int g_initialized = 0;
  
  s_rtbuf_lib_proc_in rtbuf_portaudio_output_in[] =
    {{ "left",  RTBUF_SIGNAL_TYPE, 0.0, -1.0, 1.0, 1.0 },
     { "right", RTBUF_SIGNAL_TYPE, 0.0, -1.0, 1.0, 1.0 },
     { 0, 0, 0.0, 0.0, 0.0, 0.0 }};
  
  s_rtbuf_lib_proc_out rtbuf_portaudio_output_out[] =
    {{ "samples", RTBUF_PORTAUDIO_SAMPLES_TYPE },
     { "reserved", RTBUF_PORTAUDIO_OUTPUT_RESERVED_TYPE },
     { 0, 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;
  }
  
  s_rtbuf_lib_proc rtbuf_lib_proc =
    { "output",
      rtbuf_portaudio_output,
      rtbuf_portaudio_output_start,
      rtbuf_portaudio_output_stop,
      rtbuf_portaudio_output_in,
      rtbuf_portaudio_output_out };
  
  unsigned long rtbuf_lib_ver = RTBUF_LIB_VER;
  

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