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/*
** Copyright 2011, The Android Open-Source Project
**
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
**
** http://www.apache.org/licenses/LICENSE-2.0
**
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*/
//#define LOG_NDEBUG 0
#define LOG_TAG "ReSampler"
#include <utils/Log.h>
#include "ReSampler.h"
namespace android_audio_legacy {
//------------------------------------------------------------------------------
// speex based resampler
//------------------------------------------------------------------------------
#define RESAMPLER_QUALITY 2
ReSampler::ReSampler(uint32_t inSampleRate,
uint32_t outSampleRate,
uint32_t channelCount,
BufferProvider* provider)
: mStatus(NO_INIT), mSpeexResampler(NULL), mProvider(provider),
mInSampleRate(inSampleRate), mOutSampleRate(outSampleRate), mChannelCount(channelCount),
mInBuf(NULL), mInBufSize(0)
{
LOGV("ReSampler() cstor %p In SR %d Out SR %d channels %d",
this, mInSampleRate, mOutSampleRate, mChannelCount);
if (mProvider == NULL) {
return;
}
int error;
mSpeexResampler = speex_resampler_init(channelCount,
inSampleRate,
outSampleRate,
RESAMPLER_QUALITY,
&error);
if (mSpeexResampler == NULL) {
LOGW("ReSampler: Cannot create speex resampler: %s", speex_resampler_strerror(error));
return;
}
reset();
int frames = speex_resampler_get_input_latency(mSpeexResampler);
mSpeexDelayNs = (int32_t)((1000000000 * (int64_t)frames) / mInSampleRate);
frames = speex_resampler_get_output_latency(mSpeexResampler);
mSpeexDelayNs += (int32_t)((1000000000 * (int64_t)frames) / mOutSampleRate);
mStatus = NO_ERROR;
}
ReSampler::~ReSampler()
{
free(mInBuf);
if (mSpeexResampler != NULL) {
speex_resampler_destroy(mSpeexResampler);
}
}
void ReSampler::reset()
{
mFramesIn = 0;
mFramesRq = 0;
if (mSpeexResampler != NULL) {
speex_resampler_reset_mem(mSpeexResampler);
}
}
int32_t ReSampler::delayNs()
{
int32_t delay = (int32_t)((1000000000 * (int64_t)mFramesIn) / mInSampleRate);
delay += mSpeexDelayNs;
return delay;
}
// outputs a number of frames less or equal to *outFrameCount and updates *outFrameCount
// with the actual number of frames produced.
int ReSampler::resample(int16_t *out, size_t *outFrameCount)
{
if (mStatus != NO_ERROR) {
return mStatus;
}
if (out == NULL || outFrameCount == NULL) {
return BAD_VALUE;
}
size_t framesRq = *outFrameCount;
// update and cache the number of frames needed at the input sampling rate to produce
// the number of frames requested at the output sampling rate
if (framesRq != mFramesRq) {
mFramesNeeded = (framesRq * mOutSampleRate) / mInSampleRate + 1;
mFramesRq = framesRq;
}
size_t framesWr = 0;
size_t inFrames = 0;
while (framesWr < framesRq) {
if (mFramesIn < mFramesNeeded) {
// make sure that the number of frames present in mInBuf (mFramesIn) is at least
// the number of frames needed to produce the number of frames requested at
// the output sampling rate
if (mInBufSize < mFramesNeeded) {
mInBufSize = mFramesNeeded;
mInBuf = (int16_t *)realloc(mInBuf, mInBufSize * mChannelCount * sizeof(int16_t));
}
BufferProvider::Buffer buf;
buf.frameCount = mFramesNeeded - mFramesIn;
mProvider->getNextBuffer(&buf);
if (buf.raw == NULL) {
break;
}
memcpy(mInBuf + mFramesIn * mChannelCount,
buf.raw,
buf.frameCount * mChannelCount * sizeof(int16_t));
mFramesIn += buf.frameCount;
mProvider->releaseBuffer(&buf);
}
size_t outFrames = framesRq - framesWr;
inFrames = mFramesIn;
if (mChannelCount == 1) {
speex_resampler_process_int(mSpeexResampler,
0,
mInBuf,
&inFrames,
out + framesWr * mChannelCount,
&outFrames);
} else {
speex_resampler_process_interleaved_int(mSpeexResampler,
mInBuf,
&inFrames,
out + framesWr * mChannelCount,
&outFrames);
}
framesWr += outFrames;
mFramesIn -= inFrames;
LOGW_IF((framesWr != framesRq) && (mFramesIn != 0),
"ReSampler::resample() remaining %d frames in and %d frames out",
mFramesIn, (framesRq - framesWr));
}
if (mFramesIn) {
memmove(mInBuf,
mInBuf + inFrames * mChannelCount,
mFramesIn * mChannelCount * sizeof(int16_t));
}
*outFrameCount = framesWr;
return NO_ERROR;
}
}; // namespace android_audio_legacy
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