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/*
* Copyright (C) 2015 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.
*/
#ifndef ANDROID_BUFFER_PROVIDERS_H
#define ANDROID_BUFFER_PROVIDERS_H
#include <stdint.h>
#include <sys/types.h>
#include <hardware/audio_effect.h>
#include <media/AudioBufferProvider.h>
#include <system/audio.h>
#include <sonic.h>
namespace android {
// ----------------------------------------------------------------------------
class PassthruBufferProvider : public AudioBufferProvider {
public:
PassthruBufferProvider() : mTrackBufferProvider(NULL) { }
virtual ~PassthruBufferProvider() { }
// call this to release the buffer to the upstream provider.
// treat it as an audio discontinuity for future samples.
virtual void reset() { }
// set the upstream buffer provider. Consider calling "reset" before this function.
virtual void setBufferProvider(AudioBufferProvider *p) {
mTrackBufferProvider = p;
}
protected:
AudioBufferProvider *mTrackBufferProvider;
};
// Base AudioBufferProvider class used for DownMixerBufferProvider, RemixBufferProvider,
// and ReformatBufferProvider.
// It handles a private buffer for use in converting format or channel masks from the
// input data to a form acceptable by the mixer.
// TODO: Make a ResamplerBufferProvider when integers are entirely removed from the
// processing pipeline.
class CopyBufferProvider : public PassthruBufferProvider {
public:
// Use a private buffer of bufferFrameCount frames (each frame is outputFrameSize bytes).
// If bufferFrameCount is 0, no private buffer is created and in-place modification of
// the upstream buffer provider's buffers is performed by copyFrames().
CopyBufferProvider(size_t inputFrameSize, size_t outputFrameSize,
size_t bufferFrameCount);
virtual ~CopyBufferProvider();
// Overrides AudioBufferProvider methods
virtual status_t getNextBuffer(Buffer *buffer, int64_t pts);
virtual void releaseBuffer(Buffer *buffer);
// Overrides PassthruBufferProvider
virtual void reset();
// this function should be supplied by the derived class. It converts
// #frames in the *src pointer to the *dst pointer. It is public because
// some providers will allow this to work on arbitrary buffers outside
// of the internal buffers.
virtual void copyFrames(void *dst, const void *src, size_t frames) = 0;
protected:
const size_t mInputFrameSize;
const size_t mOutputFrameSize;
private:
AudioBufferProvider::Buffer mBuffer;
const size_t mLocalBufferFrameCount;
void *mLocalBufferData;
size_t mConsumed;
};
// DownmixerBufferProvider derives from CopyBufferProvider to provide
// position dependent downmixing by an Audio Effect.
class DownmixerBufferProvider : public CopyBufferProvider {
public:
DownmixerBufferProvider(audio_channel_mask_t inputChannelMask,
audio_channel_mask_t outputChannelMask, audio_format_t format,
uint32_t sampleRate, int32_t sessionId, size_t bufferFrameCount);
virtual ~DownmixerBufferProvider();
//Overrides
virtual void copyFrames(void *dst, const void *src, size_t frames);
bool isValid() const { return mDownmixHandle != NULL; }
static status_t init();
static bool isMultichannelCapable() { return sIsMultichannelCapable; }
protected:
effect_handle_t mDownmixHandle;
effect_config_t mDownmixConfig;
// effect descriptor for the downmixer used by the mixer
static effect_descriptor_t sDwnmFxDesc;
// indicates whether a downmix effect has been found and is usable by this mixer
static bool sIsMultichannelCapable;
// FIXME: should we allow effects outside of the framework?
// We need to here. A special ioId that must be <= -2 so it does not map to a session.
static const int32_t SESSION_ID_INVALID_AND_IGNORED = -2;
};
// RemixBufferProvider derives from CopyBufferProvider to perform an
// upmix or downmix to the proper channel count and mask.
class RemixBufferProvider : public CopyBufferProvider {
public:
RemixBufferProvider(audio_channel_mask_t inputChannelMask,
audio_channel_mask_t outputChannelMask, audio_format_t format,
size_t bufferFrameCount);
//Overrides
virtual void copyFrames(void *dst, const void *src, size_t frames);
protected:
const audio_format_t mFormat;
const size_t mSampleSize;
const size_t mInputChannels;
const size_t mOutputChannels;
int8_t mIdxAry[sizeof(uint32_t) * 8]; // 32 bits => channel indices
};
// ReformatBufferProvider derives from CopyBufferProvider to convert the input data
// to an acceptable mixer input format type.
class ReformatBufferProvider : public CopyBufferProvider {
public:
ReformatBufferProvider(int32_t channelCount,
audio_format_t inputFormat, audio_format_t outputFormat,
size_t bufferFrameCount);
virtual void copyFrames(void *dst, const void *src, size_t frames);
protected:
const uint32_t mChannelCount;
const audio_format_t mInputFormat;
const audio_format_t mOutputFormat;
};
// TimestretchBufferProvider derives from PassthruBufferProvider for time stretching
class TimestretchBufferProvider : public PassthruBufferProvider {
public:
TimestretchBufferProvider(int32_t channelCount,
audio_format_t format, uint32_t sampleRate, float speed, float pitch);
virtual ~TimestretchBufferProvider();
// Overrides AudioBufferProvider methods
virtual status_t getNextBuffer(Buffer* buffer, int64_t pts);
virtual void releaseBuffer(Buffer* buffer);
// Overrides PassthruBufferProvider
virtual void reset();
virtual status_t setPlaybackRate(float speed, float pitch);
// processes frames
// dstBuffer is where to place the data
// dstFrames [in/out] is the desired frames (return with actual placed in buffer)
// srcBuffer is the source data
// srcFrames [in/out] is the available source frames (return with consumed)
virtual void processFrames(void *dstBuffer, size_t *dstFrames,
const void *srcBuffer, size_t *srcFrames);
protected:
const uint32_t mChannelCount;
const audio_format_t mFormat;
const uint32_t mSampleRate; // const for now (TODO change this)
const size_t mFrameSize;
float mSpeed;
float mPitch;
private:
AudioBufferProvider::Buffer mBuffer;
size_t mLocalBufferFrameCount;
void *mLocalBufferData;
size_t mRemaining;
sonicStream mSonicStream;
};
// ----------------------------------------------------------------------------
} // namespace android
#endif // ANDROID_BUFFER_PROVIDERS_H
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