/*
* Process tail of input samples.
*/
int st_resample_drain(eff_t effp, st_sample_t *obuf, st_size_t *osamp)
{
resample_t r = (resample_t) effp->priv;
long isamp_res, osamp_res;
st_sample_t *Obuf;
int rc;
/* fprintf(stderr,"Xoff %d, Xt %d <--- DRAIN\n",r->Xoff, r->Xt); */
/* stuff end with Xoff zeros */
isamp_res = r->Xoff;
osamp_res = *osamp;
Obuf = obuf;
while (isamp_res>0 && osamp_res>0) {
st_sample_t Isamp, Osamp;
Isamp = isamp_res;
Osamp = osamp_res;
rc = st_resample_flow(effp, NULL, Obuf, (st_size_t *)&Isamp, (st_size_t *)&Osamp);
if (rc)
return rc;
/* fprintf(stderr,"DRAIN isamp,osamp (%d,%d) -> (%d,%d)\n",
isamp_res,osamp_res,Isamp,Osamp); */
Obuf += Osamp;
osamp_res -= Osamp;
isamp_res -= Isamp;
}
*osamp -= osamp_res;
/* fprintf(stderr,"DRAIN osamp %d\n", *osamp); */
if (isamp_res)
st_warn("drain overran obuf by %d\n", isamp_res); fflush(stderr);
return (ST_SUCCESS);
}
void CAudioEncoder::ResampleAudio(
const u_int8_t* frameData,
u_int32_t frameDataLength)
{
uint32_t samplesIn;
uint32_t samplesInConsumed;
uint32_t outBufferSamplesLeft;
uint32_t outBufferSamplesWritten;
uint32_t chan_offset;
samplesIn = DstBytesToSamples(frameDataLength);
// so far, record the pre length
while (samplesIn > 0) {
outBufferSamplesLeft =
DstBytesToSamples(m_audioPreEncodingBufferMaxLength -
m_audioPreEncodingBufferLength);
if (outBufferSamplesLeft * 2 <= samplesIn && samplesIn > 0) {
m_audioPreEncodingBufferMaxLength *= 2;
m_audioPreEncodingBuffer =
(u_int8_t*)realloc(m_audioPreEncodingBuffer,
m_audioPreEncodingBufferMaxLength);
}
for (uint8_t chan_ix = 0; chan_ix < m_audioDstChannels; chan_ix++) {
samplesInConsumed = samplesIn;
outBufferSamplesWritten = outBufferSamplesLeft;
chan_offset = chan_ix * (DstSamplesToBytes(1));
#ifdef DEBUG_AUDIO_RESAMPLER
error_message("%s:resample - chans %d %d, samples %d left %d",
Profile()->GetName(),
m_audioDstChannels, chan_ix,
samplesIn, outBufferSamplesLeft);
#endif
if (st_resample_flow(m_audioResample[chan_ix],
(int16_t *)(frameData + chan_offset),
(int16_t *)(&m_audioPreEncodingBuffer[m_audioPreEncodingBufferLength + chan_offset]),
&samplesInConsumed,
&outBufferSamplesWritten,
m_audioDstChannels) < 0) {
error_message("%s:resample failed", Profile()->GetName());
}
#ifdef DEBUG_AUDIO_RESAMPLER
debug_message("%s:Chan %d consumed %d wrote %d",
Profile()->GetName(),
chan_ix, samplesInConsumed, outBufferSamplesWritten);
#endif
}
if (outBufferSamplesLeft < outBufferSamplesWritten) {
error_message("%s:Written past end of buffer",
Profile()->GetName());
}
samplesIn -= samplesInConsumed;
outBufferSamplesLeft -= outBufferSamplesWritten;
m_audioPreEncodingBufferLength += DstSamplesToBytes(outBufferSamplesWritten);
// If we have no room for new output data, and more to process,
// give us a bunch more room...
} // end while we still have input samples
}
