Ejemplo n.º 1
0
void usb_stream_close(void)
{
    int i;

    // Reset status to not initialized
    usb_stream_context->status = USB_STREAM_STATUS_NOT_INITIALIZED;

    if (usb_stream_context->ctx_overrun.resampling)
        dsp16_resampling_free(usb_stream_context->ctx_overrun.resampling, (free_fct_t) free);
    if (usb_stream_context->ctx_underrun.resampling)
        dsp16_resampling_free(usb_stream_context->ctx_underrun.resampling, (free_fct_t) free);
    if (usb_stream_context->ctx_original.resampling)
        dsp16_resampling_free(usb_stream_context->ctx_original.resampling, (free_fct_t) free);

    usb_stream_context->ctx_original.resampling = NULL;
    usb_stream_context->ctx_underrun.resampling = NULL;
    usb_stream_context->ctx_overrun.resampling = NULL;
    usb_stream_context->ctx = NULL;

    // Free also the output buffers
    for(i=0; i<AUDIO_STREAM_NB_OUTPUT_BUFFERS; i++)
    {
        if (usb_stream_context->output_buffers[i])
        {
            free(usb_stream_context->output_buffers[i]);
            usb_stream_context->output_buffers[i] = NULL;
        }
    }
    // Free the temporary output buffer
    if (usb_stream_context->output_temp_buffer)
        free(usb_stream_context->output_temp_buffer);
    usb_stream_context->output_temp_buffer = NULL;
}
Ejemplo n.º 2
0
//! The main function
int main(int argc, char *argv[])
{
  A_ALIGNED static dsp16_t s_input[N/NB_CUTS];
  int f;
  dsp_resampling_t *resampling;
  dsp16_t *output;
  U32 temp;
  dsp16_resampling_options_t options;

  // Initialize options
  memset(&options, 0, sizeof(options));
  options.coefficients_generation = DSP16_RESAMPLING_OPTIONS_USE_DYNAMIC;
  options.dynamic.coefficients_normalization = true;

  // Switch to external Oscillator 0.
  pm_switch_to_osc0(&AVR32_PM, FOSC0, OSC0_STARTUP);

  // Initialize the DSP debug module
  dsp_debug_initialization(FOSC0);

  dsp16_debug_printf("16-bit fixed point signal resampling\n");
  dsp16_debug_printf("Input Fs: %iHz\n", F_INPUT);
  dsp16_debug_printf("Output Fs: %iHz\n", F_OUTPUT);
  dsp16_debug_printf("%i samples to process cut into %i buffers\n", N, NB_CUTS);
  dsp16_debug_printf("Filter order used: %i\n", FILTER_ORDER);

  if (!(resampling = dsp16_resampling_setup(F_INPUT, F_OUTPUT, N/NB_CUTS, FILTER_ORDER, 1, (malloc_fct_t) malloc, &options)))
  {
    dsp16_debug_printf("Unable to allocate enough memory\n");
    return -1;
  }

  if (!(output = (dsp16_t *) malloc(dsp16_resampling_get_output_max_buffer_size(resampling)*sizeof(dsp16_t) + 4)))
  {
    dsp16_debug_printf("Unable to allocate enough memory for the output buffer\n");
    return -1;
  }

  for(f=0; f<NB_CUTS; f++)
  {
    memcpy(s_input, &s[N/NB_CUTS*f], (N/NB_CUTS)*sizeof(dsp16_t));
    temp = Get_sys_count();
    dsp16_resampling_compute(resampling, output, s_input, 0);
    temp = Get_sys_count() - temp;
    dsp16_debug_print_vect(output, dsp16_resampling_get_output_current_buffer_size(resampling));
  }
  dsp16_debug_printf(
    "Cycle count per iteration: %i\n            in total (to compute %i samples): %i\n",
    temp,
    dsp16_resampling_get_output_current_buffer_size(resampling)*NB_CUTS,
    temp*NB_CUTS);

  dsp16_resampling_free(resampling, (free_fct_t) free);

  while(1);
}