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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
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* See the License for the specific language governing permissions and
* limitations under the License.
#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 {
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;
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 {
// 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;
const size_t mInputFrameSize;
const size_t mOutputFrameSize;
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 {
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();
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; }
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 {
RemixBufferProvider(audio_channel_mask_t inputChannelMask,
audio_channel_mask_t outputChannelMask, audio_format_t format,
size_t bufferFrameCount);
virtual void copyFrames(void *dst, const void *src, size_t frames);
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 {
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);
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 {
TimestretchBufferProvider(int32_t channelCount,
audio_format_t format, uint32_t sampleRate,
const AudioPlaybackRate &playbackRate);
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(const AudioPlaybackRate &playbackRate);
// 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);
const uint32_t mChannelCount;
const audio_format_t mFormat;
const uint32_t mSampleRate; // const for now (TODO change this)
const size_t mFrameSize;
AudioPlaybackRate mPlaybackRate;
AudioBufferProvider::Buffer mBuffer; // for upstream request
size_t mLocalBufferFrameCount; // size of local buffer
void *mLocalBufferData; // internally allocated buffer for data returned
// to caller
size_t mRemaining; // remaining data in local buffer
sonicStream mSonicStream; // handle to sonic timestretch object
//FIXME: this dependency should be abstracted out
bool mFallbackFailErrorShown; // log fallback error only once
bool mAudioPlaybackRateValid; // flag for current parameters validity
// ----------------------------------------------------------------------------
} // namespace android