/* Input and output sampling rate are at most 48000 Hz */
int silk_resampler(silk_resampler_state_struct * S, /* I/O Resampler state */
int16_t out[], /* O Output signal */
const int16_t in[], /* I Input signal */
int32_t inLen /* I Number of input samples */
)
{
int nSamples;
/* Need at least 1 ms of input data */
assert(inLen >= S->Fs_in_kHz);
/* Delay can't exceed the 1 ms of buffering */
assert(S->inputDelay <= S->Fs_in_kHz);
nSamples = S->Fs_in_kHz - S->inputDelay;
/* Copy to delay buffer */
memcpy(&S->delayBuf[S->inputDelay], in,
nSamples * sizeof(int16_t));
switch (S->resampler_function) {
case USE_silk_resampler_private_up2_HQ_wrapper:
silk_resampler_private_up2_HQ_wrapper(S, out, S->delayBuf,
S->Fs_in_kHz);
silk_resampler_private_up2_HQ_wrapper(S, &out[S->Fs_out_kHz],
&in[nSamples],
inLen - S->Fs_in_kHz);
break;
case USE_silk_resampler_private_IIR_FIR:
silk_resampler_private_IIR_FIR(S, out, S->delayBuf,
S->Fs_in_kHz);
silk_resampler_private_IIR_FIR(S, &out[S->Fs_out_kHz],
&in[nSamples],
inLen - S->Fs_in_kHz);
break;
case USE_silk_resampler_private_down_FIR:
silk_resampler_private_down_FIR(S, out, S->delayBuf,
S->Fs_in_kHz);
silk_resampler_private_down_FIR(S, &out[S->Fs_out_kHz],
&in[nSamples],
inLen - S->Fs_in_kHz);
break;
default:
memcpy(out, S->delayBuf,
S->Fs_in_kHz * sizeof(int16_t));
memcpy(&out[S->Fs_out_kHz], &in[nSamples],
(inLen - S->Fs_in_kHz) * sizeof(int16_t));
}
/* Copy to delay buffer */
memcpy(S->delayBuf, &in[inLen - S->inputDelay],
S->inputDelay * sizeof(int16_t));
return 0;
}
/* Resampler: convert from one sampling rate to another */
opus_int silk_resampler(
silk_resampler_state_struct *S, /* I/O Resampler state */
opus_int16 out[], /* O Output signal */
const opus_int16 in[], /* I Input signal */
opus_int32 inLen /* I Number of input samples */
)
{
/* Input and output sampling rate are at most 48000 Hz */
switch( S->resampler_function ) {
case USE_silk_resampler_private_up2_HQ_wrapper:
silk_resampler_private_up2_HQ_wrapper( S, out, in, inLen );
break;
case USE_silk_resampler_private_IIR_FIR:
silk_resampler_private_IIR_FIR( S, out, in, inLen );
break;
case USE_silk_resampler_private_down_FIR:
silk_resampler_private_down_FIR( S, out, in, inLen );
break;
default:
silk_memcpy( out, in, inLen * sizeof( opus_int16 ) );
}
return 0;
}
