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;
}
//! 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);
}