tenfourfox/dom/media/omx/OMXCodecWrapper.h

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2017-04-19 07:56:45 +00:00
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-*/
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef OMXCodecWrapper_h_
#define OMXCodecWrapper_h_
#include <gui/Surface.h>
#include <utils/RefBase.h>
#include <stagefright/foundation/ABuffer.h>
#include <stagefright/foundation/AMessage.h>
#include <stagefright/MediaCodec.h>
#include "AudioSegment.h"
#include "GonkNativeWindow.h"
#include "GonkNativeWindowClient.h"
#include "mozilla/media/MediaSystemResourceClient.h"
#include "mozilla/RefPtr.h"
#include <speex/speex_resampler.h>
namespace android {
// Wrapper class for managing HW codec reservations
class OMXCodecReservation : public RefBase
{
public:
OMXCodecReservation(bool aEncoder) : mOwned(false)
{
mType = aEncoder ? mozilla::MediaSystemResourceType::VIDEO_ENCODER :
mozilla::MediaSystemResourceType::VIDEO_DECODER;
}
virtual ~OMXCodecReservation()
{
ReleaseOMXCodec();
}
/** Reserve the Encode or Decode resource for this instance */
virtual bool ReserveOMXCodec();
/** Release the Encode or Decode resource for this instance */
virtual void ReleaseOMXCodec();
private:
mozilla::MediaSystemResourceType mType;
bool mOwned; // We already own this resource
RefPtr<mozilla::MediaSystemResourceClient> mClient;
};
class OMXAudioEncoder;
class OMXVideoEncoder;
/**
* This class (and its subclasses) wraps the video and audio codec from
* MediaCodec API in libstagefright. Currently only AVC/H.264 video encoder and
* AAC audio encoder are supported.
*
* OMXCodecWrapper has static creator functions that returns actual codec
* instances for different types of codec supported and serves as superclass to
* provide a function to read encoded data as byte array from codec. Two
* subclasses, OMXAudioEncoder and OMXVideoEncoder, respectively provides
* functions for encoding data from audio and video track.
*
* A typical usage is as follows:
* - Call one of the creator function Create...() to get either a
* OMXAudioEncoder or OMXVideoEncoder object.
* - Configure codec by providing characteristics of input raw data, such as
* video frame width and height, using Configure().
* - Send raw data (and notify end of stream) with Encode().
* - Get encoded data through GetNextEncodedFrame().
* - Repeat previous 2 steps until end of stream.
* - Destroy the object.
*
* The lifecycle of underlying OMX codec is binded with construction and
* destruction of OMXCodecWrapper and subclass objects. For some types of
* codecs, such as HW accelerated AVC/H.264 encoder, there can be only one
* instance system-wise at a time, attempting to create another instance will
* fail.
*/
class OMXCodecWrapper
{
public:
// Codec types.
enum CodecType {
AAC_ENC, // AAC encoder.
AMR_NB_ENC, // AMR_NB encoder.
AVC_ENC, // AVC/H.264 encoder.
EVRC_ENC, // EVRC encoder
TYPE_COUNT
};
// Input and output flags.
enum {
// For Encode() and Encode, it indicates the end of input stream;
// For GetNextEncodedFrame(), it indicates the end of output
// stream.
BUFFER_EOS = MediaCodec::BUFFER_FLAG_EOS,
// For GetNextEncodedFrame(). It indicates the output buffer is an I-frame.
BUFFER_SYNC_FRAME = MediaCodec::BUFFER_FLAG_SYNCFRAME,
// For GetNextEncodedFrame(). It indicates that the output buffer contains
// codec specific configuration info. (SPS & PPS for AVC/H.264;
// DecoderSpecificInfo for AAC)
BUFFER_CODEC_CONFIG = MediaCodec::BUFFER_FLAG_CODECCONFIG,
};
// Hard-coded values for AAC DecoderConfigDescriptor in libstagefright.
// See MPEG4Writer::Track::writeMp4aEsdsBox()
// Exposed for the need of MP4 container writer.
enum {
kAACBitrate = 96000, // kbps
kAACFrameSize = 768, // bytes
kAACFrameDuration = 1024, // How many samples per AAC frame.
};
/** Create a AAC audio encoder. Returns nullptr when failed. */
static OMXAudioEncoder* CreateAACEncoder();
/** Create a AMR audio encoder. Returns nullptr when failed. */
static OMXAudioEncoder* CreateAMRNBEncoder();
/** Create a EVRC audio encoder. Returns nullptr when failed. */
static OMXAudioEncoder* CreateEVRCEncoder();
/** Create a AVC/H.264 video encoder. Returns nullptr when failed. */
static OMXVideoEncoder* CreateAVCEncoder();
virtual ~OMXCodecWrapper();
/**
* Get the next available encoded data from MediaCodec. The data will be
* copied into aOutputBuf array, with its timestamp (in microseconds) in
* aOutputTimestamp.
* Wait at most aTimeout microseconds to dequeue a output buffer.
*/
nsresult GetNextEncodedFrame(nsTArray<uint8_t>* aOutputBuf,
int64_t* aOutputTimestamp, int* aOutputFlags,
int64_t aTimeOut);
/*
* Get the codec type
*/
int GetCodecType() { return mCodecType; }
protected:
/**
* See whether the object has been initialized successfully and is ready to
* use.
*/
virtual bool IsValid() { return mCodec != nullptr; }
/**
* Construct codec specific configuration blob with given data aData generated
* by media codec and append it into aOutputBuf. Needed by MP4 container
* writer for generating decoder config box, or WebRTC for generating RTP
* packets. Returns OK if succeed.
*/
virtual status_t AppendDecoderConfig(nsTArray<uint8_t>* aOutputBuf,
ABuffer* aData) = 0;
/**
* Append encoded frame data generated by media codec (stored in aData and
* is aSize bytes long) into aOutputBuf. Subclasses can override this function
* to process the data for specific container writer.
*/
virtual void AppendFrame(nsTArray<uint8_t>* aOutputBuf,
const uint8_t* aData, size_t aSize)
{
aOutputBuf->AppendElements(aData, aSize);
}
private:
// Hide these. User should always use creator functions to get a media codec.
OMXCodecWrapper() = delete;
OMXCodecWrapper(const OMXCodecWrapper&) = delete;
OMXCodecWrapper& operator=(const OMXCodecWrapper&) = delete;
/**
* Create a media codec of given type. It will be a AVC/H.264 video encoder if
* aCodecType is CODEC_AVC_ENC, or AAC audio encoder if aCodecType is
* CODEC_AAC_ENC.
*/
OMXCodecWrapper(CodecType aCodecType);
// For subclasses to access hidden constructor and implementation details.
friend class OMXAudioEncoder;
friend class OMXVideoEncoder;
/**
* Start the media codec.
*/
status_t Start();
/**
* Stop the media codec.
*/
status_t Stop();
// The actual codec instance provided by libstagefright.
sp<MediaCodec> mCodec;
// A dedicate message loop with its own thread used by MediaCodec.
sp<ALooper> mLooper;
Vector<sp<ABuffer> > mInputBufs; // MediaCodec buffers to hold input data.
Vector<sp<ABuffer> > mOutputBufs; // MediaCodec buffers to hold output data.
int mCodecType;
bool mStarted; // Has MediaCodec been started?
bool mAMRCSDProvided;
bool mEVRCCSDProvided;
};
/**
* Audio encoder.
*/
class OMXAudioEncoder final : public OMXCodecWrapper
{
public:
/**
* Configure audio codec parameters and start media codec. It must be called
* before calling Encode() and GetNextEncodedFrame().
* aReSamplingRate = 0 means no resampler required
*/
nsresult Configure(int aChannelCount, int aInputSampleRate, int aEncodedSampleRate);
/**
* Encode 16-bit PCM audio samples stored in aSegment. To notify end of
* stream, set aInputFlags to BUFFER_EOS. Since encoder has limited buffers,
* this function might not be able to encode all chunks in one call, however
* it will remove chunks it consumes from aSegment.
* aSendEOS is the output to tell the caller EOS signal sent into MediaCodec
* because the signal might not be sent due to the dequeueInputBuffer timeout.
* And the value of aSendEOS won't be set to any default value, only set to
* true when EOS signal sent into MediaCodec.
*/
nsresult Encode(mozilla::AudioSegment& aSegment, int aInputFlags = 0,
bool* aSendEOS = nullptr);
~OMXAudioEncoder();
protected:
virtual status_t AppendDecoderConfig(nsTArray<uint8_t>* aOutputBuf,
ABuffer* aData) override;
private:
// Hide these. User should always use creator functions to get a media codec.
OMXAudioEncoder() = delete;
OMXAudioEncoder(const OMXAudioEncoder&) = delete;
OMXAudioEncoder& operator=(const OMXAudioEncoder&) = delete;
/**
* Create a audio codec. It will be a AAC encoder if aCodecType is
* CODEC_AAC_ENC.
*/
OMXAudioEncoder(CodecType aCodecType)
: OMXCodecWrapper(aCodecType)
, mResampler(nullptr)
, mChannels(0)
, mResamplingRatio(0)
, mTimestamp(0)
, mSampleDuration(0) {}
// For creator function to access hidden constructor.
friend class OMXCodecWrapper;
friend class InputBufferHelper;
/**
* If the input sample rate does not divide 48kHz evenly, the input data are
* resampled.
*/
SpeexResamplerState* mResampler;
// Number of audio channels.
size_t mChannels;
float mResamplingRatio;
// The total duration of audio samples that have been encoded in microseconds.
int64_t mTimestamp;
// Time per audio sample in microseconds.
int64_t mSampleDuration;
};
/**
* Video encoder.
*/
class OMXVideoEncoder final : public OMXCodecWrapper
{
public:
// Types of output blob format.
enum BlobFormat {
AVC_MP4, // MP4 file config descripter (defined in ISO/IEC 14496-15 5.2.4.1.1)
AVC_NAL // NAL (Network Abstract Layer) (defined in ITU-T H.264 7.4.1)
};
/**
* Configure video codec parameters and start media codec. It must be called
* before calling Encode() and GetNextEncodedFrame().
* aBlobFormat specifies output blob format provided by encoder. It can be
* AVC_MP4 or AVC_NAL.
* Configure sets up most format value to values appropriate for camera use.
* ConfigureDirect lets the caller determine all the defaults.
*/
nsresult Configure(int aWidth, int aHeight, int aFrameRate,
BlobFormat aBlobFormat = BlobFormat::AVC_MP4);
nsresult ConfigureDirect(sp<AMessage>& aFormat,
BlobFormat aBlobFormat = BlobFormat::AVC_MP4);
/**
* Encode a aWidth pixels wide and aHeight pixels tall video frame of
* semi-planar YUV420 format stored in the buffer of aImage. aTimestamp gives
* the frame timestamp/presentation time (in microseconds). To notify end of
* stream, set aInputFlags to BUFFER_EOS.
* aSendEOS is the output to tell the caller EOS signal sent into MediaCodec
* because the signal might not be sent due to the dequeueInputBuffer timeout.
* And the value of aSendEOS won't be set to any default value, only set to
* true when EOS signal sent into MediaCodec.
*/
nsresult Encode(const mozilla::layers::Image* aImage, int aWidth, int aHeight,
int64_t aTimestamp, int aInputFlags = 0,
bool* aSendEOS = nullptr);
#if ANDROID_VERSION >= 18
/** Set encoding bitrate (in kbps). */
nsresult SetBitrate(int32_t aKbps);
#endif
/**
* Ask codec to generate an instantaneous decoding refresh (IDR) frame
* (defined in ISO/IEC 14496-10).
*/
nsresult RequestIDRFrame();
protected:
virtual status_t AppendDecoderConfig(nsTArray<uint8_t>* aOutputBuf,
ABuffer* aData) override;
// If configured to output MP4 format blob, AVC/H.264 encoder has to replace
// NAL unit start code with the unit length as specified in
// ISO/IEC 14496-15 5.2.3.
virtual void AppendFrame(nsTArray<uint8_t>* aOutputBuf,
const uint8_t* aData, size_t aSize) override;
private:
// Hide these. User should always use creator functions to get a media codec.
OMXVideoEncoder() = delete;
OMXVideoEncoder(const OMXVideoEncoder&) = delete;
OMXVideoEncoder& operator=(const OMXVideoEncoder&) = delete;
/**
* Create a video codec. It will be a AVC/H.264 encoder if aCodecType is
* CODEC_AVC_ENC.
*/
OMXVideoEncoder(CodecType aCodecType)
: OMXCodecWrapper(aCodecType)
, mWidth(0)
, mHeight(0)
, mBlobFormat(BlobFormat::AVC_MP4)
{}
// For creator function to access hidden constructor.
friend class OMXCodecWrapper;
int mWidth;
int mHeight;
BlobFormat mBlobFormat;
};
} // namespace android
#endif // OMXCodecWrapper_h_