goto.c

static int
audio_linux_set_hwparams (AudioLinux * al)
{
  snd_pcm_hw_params_t *params;
  unsigned int rrate;
  int err, dir;

  snd_pcm_hw_params_malloc (&params);

  /* choose all parameters */
  err = snd_pcm_hw_params_any (al->handle, params);
  if (err < 0)
    {
      log_warning (NULL,
                   "broken configuration, no configurations available: %s",
                   snd_strerror (err));
      goto return_of_jedi;
    }

  /* set hardware resampling */
  err =
    snd_pcm_hw_params_set_rate_resample (al->handle, params,
                                         audio_linux_resample);
  if (err < 0)
    {
      log_warning (NULL, "resampling setup failed: %s", snd_strerror (err));
      goto return_of_jedi;
    }

  /* set the interleaved read/write format */
  err =
    snd_pcm_hw_params_set_access (al->handle, params,
                                  SND_PCM_ACCESS_RW_INTERLEAVED);
  if (err < 0)
    {
      log_warning (NULL, "access type not available: %s", snd_strerror (err));
      goto return_of_jedi;
    }

  /* set the sample format */
  err = snd_pcm_hw_params_set_format (al->handle, params, al->format);
  if (err < 0)
    {
      log_warning (NULL, "sample format not available: %s",
                   snd_strerror (err));
      goto return_of_jedi;
    }

  /* set the count of channels */
  err = snd_pcm_hw_params_set_channels (al->handle, params, al->channels);
  if (err < 0)
    {
      log_warning (NULL, "channels count (%i) not available: %s",
                   al->channels, snd_strerror (err));
      goto return_of_jedi;
    }

  /* set the stream rate */
  rrate = al->sample_rate;
  err = snd_pcm_hw_params_set_rate_near (al->handle, params, &rrate, 0);
  if (err < 0)
    {
      log_warning (NULL, "rate %iHz not available: %s", al->sample_rate,
                   snd_strerror (err));
      goto return_of_jedi;
    }
  if (rrate != al->sample_rate)
    {
      log_warning (NULL, "rate doesn't match (requested %iHz, get %iHz)",
                   al->sample_rate, rrate);
      err = -EINVAL;
      goto return_of_jedi;
    }

  /* set the buffer time */
  err =
    snd_pcm_hw_params_set_buffer_time_near (al->handle, params,
                                            &audio_linux_buffer_time, &dir);
  if (err < 0)
    {
      log_warning (NULL, "unable to set buffer time %i: %s",
                   audio_linux_buffer_time, snd_strerror (err));
      goto return_of_jedi;
    }

  /* set the period time */
  err =
    snd_pcm_hw_params_set_period_time_near (al->handle, params,
                                            &audio_linux_period_time, &dir);
  if (err < 0)
    {
      log_warning (NULL, "unable to set period time %i: %s",
                   audio_linux_period_time, snd_strerror (err));
      goto return_of_jedi;
    }

  /* write the parameters to the device */
  err = snd_pcm_hw_params (al->handle, params);
  if (err < 0)
    {
      log_warning (NULL, "unable to set hw params: %s", snd_strerror (err));
      goto return_of_jedi;
    }

return_of_jedi:

  snd_pcm_hw_params_free (params);

  return err;
}