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/*
* Copyright (C) 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 1
#include <audio_utils/primitives.h>
#include <utils/Log.h>
#include "AudioMixer.h"
#include "VideoEditorResampler.h"
namespace android {
struct VideoEditorResampler : public AudioBufferProvider {
public:
virtual status_t getNextBuffer(Buffer* buffer, int64_t pts);
virtual void releaseBuffer(Buffer* buffer);
enum { //Sampling freq
kFreq8000Hz = 8000,
kFreq11025Hz = 11025,
kFreq12000Hz = 12000,
kFreq16000Hz = 16000,
kFreq22050Hz = 22050,
kFreq24000Hz = 24000,
kFreq32000Hz = 32000,
kFreq44100 = 44100,
kFreq48000 = 48000,
};
AudioResampler *mResampler;
int16_t* mInput;
int nbChannels;
int nbSamples;
M4OSA_Int32 outSamplingRate;
M4OSA_Int32 inSamplingRate;
int16_t *mTmpInBuffer;
};
#define MAX_SAMPLEDURATION_FOR_CONVERTION 40 //ms
status_t VideoEditorResampler::getNextBuffer(AudioBufferProvider::Buffer *pBuffer, int64_t pts) {
uint32_t dataSize = pBuffer->frameCount * this->nbChannels * sizeof(int16_t);
mTmpInBuffer = (int16_t*)malloc(dataSize);
memcpy(mTmpInBuffer, this->mInput, dataSize);
pBuffer->raw = (void*)mTmpInBuffer;
return OK;
}
void VideoEditorResampler::releaseBuffer(AudioBufferProvider::Buffer *pBuffer) {
if(pBuffer->raw != NULL) {
free(pBuffer->raw);
pBuffer->raw = NULL;
mTmpInBuffer = NULL;
}
pBuffer->frameCount = 0;
}
extern "C" {
M4OSA_Context LVAudioResamplerCreate(M4OSA_Int32 bitDepth, M4OSA_Int32 inChannelCount,
M4OSA_Int32 sampleRate, M4OSA_Int32 quality) {
VideoEditorResampler *context = new VideoEditorResampler();
context->mResampler = AudioResampler::create(
bitDepth, inChannelCount, sampleRate, AudioResampler::DEFAULT);
if (context->mResampler == NULL) {
return NULL;
}
context->mResampler->setSampleRate(android::VideoEditorResampler::kFreq32000Hz);
context->mResampler->setVolume(0x1000, 0x1000);
context->nbChannels = inChannelCount;
context->outSamplingRate = sampleRate;
context->mInput = NULL;
context->mTmpInBuffer = NULL;
return ((M4OSA_Context )context);
}
void LVAudiosetSampleRate(M4OSA_Context resamplerContext, M4OSA_Int32 inSampleRate) {
VideoEditorResampler *context =
(VideoEditorResampler *)resamplerContext;
context->mResampler->setSampleRate(inSampleRate);
/*
* nbSamples is calculated for 40ms worth of data;hence sample rate
* is used to calculate the nbSamples
*/
context->inSamplingRate = inSampleRate;
// Allocate buffer for maximum allowed number of samples.
context->mInput = (int16_t*)malloc( (inSampleRate * MAX_SAMPLEDURATION_FOR_CONVERTION *
context->nbChannels * sizeof(int16_t)) / 1000);
}
void LVAudiosetVolume(M4OSA_Context resamplerContext, M4OSA_Int16 left, M4OSA_Int16 right) {
VideoEditorResampler *context =
(VideoEditorResampler *)resamplerContext;
context->mResampler->setVolume(left,right);
}
void LVDestroy(M4OSA_Context resamplerContext) {
VideoEditorResampler *context =
(VideoEditorResampler *)resamplerContext;
if (context->mTmpInBuffer != NULL) {
free(context->mTmpInBuffer);
context->mTmpInBuffer = NULL;
}
if (context->mInput != NULL) {
free(context->mInput);
context->mInput = NULL;
}
if (context->mResampler != NULL) {
delete context->mResampler;
context->mResampler = NULL;
}
if (context != NULL) {
delete context;
context = NULL;
}
}
void LVAudioresample_LowQuality(M4OSA_Int16* out, M4OSA_Int16* input,
M4OSA_Int32 outFrameCount, M4OSA_Context resamplerContext) {
VideoEditorResampler *context =
(VideoEditorResampler *)resamplerContext;
int32_t *pTmpBuffer = NULL;
context->nbSamples = (context->inSamplingRate * outFrameCount) / context->outSamplingRate;
memcpy(context->mInput,input,(context->nbSamples * context->nbChannels * sizeof(int16_t)));
/*
SRC module always gives stereo output, hence 2 for stereo audio
*/
pTmpBuffer = (int32_t*)malloc(outFrameCount * 2 * sizeof(int32_t));
memset(pTmpBuffer, 0x00, outFrameCount * 2 * sizeof(int32_t));
context->mResampler->resample((int32_t *)pTmpBuffer,
(size_t)outFrameCount, (VideoEditorResampler *)resamplerContext);
// Convert back to 16 bits
ditherAndClamp((int32_t*)out, pTmpBuffer, outFrameCount);
free(pTmpBuffer);
pTmpBuffer = NULL;
}
}
} //namespace android
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