sbr_encoder.h - Android社区 - https://www.androidos.net.cn/

/* -----------------------------------------------------------------------------------------------------------
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Fraunhofer Institute for Integrated Circuits IIS
Attention: Audio and Multimedia Departments - FDK AAC LL
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----------------------------------------------------------------------------------------------------------- */

/***************************  Fraunhofer IIS ***********************

Author(s):
   Description: SBR encoder top level processing prototype

******************************************************************************/

#ifndef __SBR_ENCODER_H
#define __SBR_ENCODER_H

#include "common_fix.h"
#include "FDK_audio.h"

#include "FDK_bitstream.h"

/* core coder helpers */
#define MAX_TRANS_FAC         8
#define MAX_CODEC_FRAME_RATIO 2
#define MAX_PAYLOAD_SIZE    256

typedef enum codecType
{
  CODEC_AAC=0,
  CODEC_AACLD=1,
  CODEC_UNSPECIFIED=99
} CODEC_TYPE;

typedef struct
{
  INT bitRate;
  INT nChannels;
  INT sampleFreq;
  INT transFac;
  INT standardBitrate;
} CODEC_PARAM;

typedef enum
{
  SBR_MONO,
  SBR_LEFT_RIGHT,
  SBR_COUPLING,
  SBR_SWITCH_LRC
} SBR_STEREO_MODE;

/* bitstream syntax flags */
enum
{
  SBR_SYNTAX_LOW_DELAY = 0x0001,
  SBR_SYNTAX_SCALABLE  = 0x0002,
  SBR_SYNTAX_CRC       = 0x0004,
  SBR_SYNTAX_DRM_CRC   = 0x0008
};

typedef struct
{
  CODEC_TYPE       coreCoder;        /*!< LC or ELD */
  UINT             bitrateFrom;      /*!< inclusive */
  UINT             bitrateTo;        /*!< exclusive */

UINT             sampleRate;       /*!<   */
  UCHAR            numChannels;      /*!<   */

UCHAR            startFreq;        /*!< bs_start_freq */
  UCHAR            startFreqSpeech;  /*!< bs_start_freq for speech config flag */
  UCHAR            stopFreq;         /*!< bs_stop_freq */
  UCHAR            stopFreqSpeech;   /*!< bs_stop_freq for speech config flag */

UCHAR            numNoiseBands;    /*!<   */
  UCHAR            noiseFloorOffset; /*!<   */
  SCHAR            noiseMaxLevel;    /*!<   */
  SBR_STEREO_MODE  stereoMode;       /*!<   */
  UCHAR            freqScale;        /*!<   */
} sbrTuningTable_t;

typedef struct sbrConfiguration
{
  /*
     core coder dependent configurations
  */
  CODEC_PARAM codecSettings;  /*!< Core coder settings. To be set from core coder. */
  INT SendHeaderDataTime;     /*!< SBR header send update frequency in ms. */
  INT useWaveCoding;          /*!< Flag: usage of wavecoding tool. */
  INT crcSbr;                 /*!< Flag: usage of SBR-CRC. */
  INT dynBwSupported;         /*!< Flag: support for dynamic bandwidth in this combination. */
  INT parametricCoding;       /*!< Flag: usage of parametric coding tool. */
  INT downSampleFactor;       /*!< Sampling rate relation between the SBR and the core encoder. */
  int freq_res_fixfix[3];     /*!< Frequency resolution of envelopes in frame class FIXFIX
                                 0=1 Env; 1=2 Env; 2=4 Env; */
  /*
     core coder dependent tuning parameters
  */
  INT tran_thr;             /*!< SBR transient detector threshold (* 100). */
  INT noiseFloorOffset;     /*!< Noise floor offset.      */
  UINT useSpeechConfig;     /*!< Flag: adapt tuning parameters according to speech. */

/*
     core coder independent configurations
  */
  INT sbrFrameSize;           /*!< SBR frame size in samples. Will be calculated from core coder settings. */
  INT sbr_data_extra;         /*!< Flag usage of data extra. */
  INT amp_res;                /*!< Amplitude resolution. */
  INT ana_max_level;          /*!< Noise insertion maximum level. */
  INT tran_fc;                /*!< Transient detector start frequency. */
  INT tran_det_mode;          /*!< Transient detector mode. */
  INT spread;                 /*!< Flag: usage of SBR spread. */
  INT stat;                   /*!< Flag: usage of static framing. */
  INT e;                      /*!< Number of envelopes when static framing is chosen. */
  SBR_STEREO_MODE stereoMode; /*!< SBR stereo mode. */
  INT deltaTAcrossFrames;     /*!< Flag: allow time-delta coding. */
  FIXP_DBL dF_edge_1stEnv;    /*!< Extra fraction delta-F coding is allowed to be more expensive. */
  FIXP_DBL dF_edge_incr;      /*!< Increment dF_edge_1stEnv this much if dT-coding was used this frame. */
  INT sbr_invf_mode;          /*!< Inverse filtering mode. */
  INT sbr_xpos_mode;          /*!< Transposer mode. */
  INT sbr_xpos_ctrl;          /*!< Transposer control. */
  INT sbr_xpos_level;         /*!< Transposer 3rd order level. */
  INT startFreq;              /*!< The start frequency table index. */
  INT stopFreq;               /*!< The stop frequency table index. */
  INT useSaPan;               /*!< Flag: usage of SAPAN stereo. */
  INT dynBwEnabled;           /*!< Flag: usage of dynamic bandwidth. */
  INT bParametricStereo;      /*!< Flag: usage of parametric stereo coding tool. */

/*
     header_extra1 configuration
  */
  UCHAR freqScale;            /*!< Frequency grouping. */
  INT alterScale;             /*!< Scale resolution. */
  INT sbr_noise_bands;        /*!< Number of noise bands. */

/*
     header_extra2 configuration
  */
  INT sbr_limiter_bands;      /*!< Number of limiter bands. */
  INT sbr_limiter_gains;      /*!< Gain of limiter. */
  INT sbr_interpol_freq;      /*!< Flag: use interpolation in freq. direction. */
  INT sbr_smoothing_length;   /*!< Flag: choose length 4 or 0 (=on, off). */
  UCHAR init_amp_res_FF;
} sbrConfiguration, *sbrConfigurationPtr ;

typedef struct SBR_CONFIG_DATA
{
  UINT sbrSyntaxFlags;                  /**< SBR syntax flags derived from AOT. */
  INT nChannels;                        /**< Number of channels.  */

INT nSfb[2];                          /**< Number of SBR scalefactor bands for LO_RES and HI_RES (?) */
  INT num_Master;                       /**< Number of elements in v_k_master. */
  INT sampleFreq;                       /**< SBR sampling frequency. */
  INT frameSize;
  INT xOverFreq;                        /**< The SBR start frequency. */
  INT dynXOverFreq;                     /**< Used crossover frequency when dynamic bandwidth is enabled. */
  INT noQmfBands;                       /**< Number of QMF frequency bands. */
  INT noQmfSlots;                       /**< Number of QMF slots. */

UCHAR *freqBandTable[2];              /**< Frequency table for low and hires, only MAX_FREQ_COEFFS/2 +1 coeefs actually needed for lowres. */
  UCHAR *v_k_master;                    /**< Master BandTable where freqBandTable is derived from. */

SBR_STEREO_MODE stereoMode;
  INT noEnvChannels;                    /**< Number of envelope channels. */

INT useWaveCoding;                    /**< Flag indicates whether to use wave coding at all.      */
  INT useParametricCoding;              /**< Flag indicates whether to use para coding at all.      */
  INT xposCtrlSwitch;                   /**< Flag indicates whether to switch xpos ctrl on the fly. */
  INT switchTransposers;                /**< Flag indicates whether to switch xpos on the fly .     */
  UCHAR initAmpResFF;
} SBR_CONFIG_DATA, *HANDLE_SBR_CONFIG_DATA;

typedef struct {
  MP4_ELEMENT_ID elType;
  INT bitRate;
  int instanceTag;
  UCHAR fParametricStereo;
  UCHAR nChannelsInEl;
  UCHAR ChannelIndex[2];
} SBR_ELEMENT_INFO;

#ifdef __cplusplus
extern "C" {
#endif

typedef struct SBR_ENCODER *HANDLE_SBR_ENCODER;

/**
 * \brief  Get the max required input buffer size including delay balancing space
 *         for N audio channels.
 * \param noChannels  Number of audio channels.
 * \return            Max required input buffer size in bytes.
 */
INT sbrEncoder_GetInBufferSize(int noChannels);

INT sbrEncoder_Open(
        HANDLE_SBR_ENCODER  *phSbrEncoder,
        INT                  nElements,
        INT                  nChannels,
        INT                  supportPS
        );

/**
 * \brief                 Get closest working bitrate to specified desired
 *                        bitrate for a single SBR element.
 * \param bitRate         The desired target bit rate
 * \param numChannels     The amount of audio channels
 * \param coreSampleRate  The sample rate of the core coder
 * \param aot             The current Audio Object Type
 * \return                Closest working bit rate to bitRate value
 */
UINT sbrEncoder_LimitBitRate(UINT bitRate, UINT numChannels, UINT coreSampleRate, AUDIO_OBJECT_TYPE aot);

/**
 * \brief                Check whether downsampled SBR single rate is possible
 *                       with given audio object type.
 * \param aot            The Audio object type.
 * \return               0 when downsampled SBR is not possible,
 *                       1 when downsampled SBR is possible.
 */
UINT sbrEncoder_IsSingleRatePossible(AUDIO_OBJECT_TYPE aot);

/**
 * \brief                  Initialize SBR Encoder instance.
 * \param phSbrEncoder     Pointer to a SBR Encoder instance.
 * \param elInfo           Structure that describes the element/channel arrangement.
 * \param noElements       Amount of elements described in elInfo.
 * \param inputBuffer      Pointer to the encoder audio buffer
 * \param bandwidth        Returns the core audio encoder bandwidth (output)
 * \param bufferOffset     Returns the offset for the audio input data in order to do delay balancing.
 * \param numChannels      Input: Encoder input channels. output: core encoder channels.
 * \param sampleRate       Input: Encoder samplerate. output core encoder samplerate.
 * \param downSampleFactor Input: Relation between SBR and core coder sampling rate;
 * \param frameLength      Input: Encoder frameLength. output core encoder frameLength.
 * \param aot              Input: Desired AOT. output AOT to be used after parameter checking.
 * \param delay            Input: core encoder delay. Output: total delay because of SBR.
 * \param transformFactor  The core encoder transform factor (blockswitching).
 * \param headerPeriod     Repetition rate of the SBR header:
 *                           - (-1) means intern configuration.
 *                           - (1-10) corresponds to header repetition rate in frames.
 * \return                 0 on success, and non-zero if failed.
 */
INT sbrEncoder_Init(
        HANDLE_SBR_ENCODER   hSbrEncoder,
        SBR_ELEMENT_INFO     elInfo[(8)],
        int                  noElements,
        INT_PCM             *inputBuffer,
        INT                 *coreBandwidth,
        INT                 *inputBufferOffset,
        INT                 *numChannels,
        INT                 *sampleRate,
        UINT                *downSampleFactor,
        INT                 *frameLength,
        AUDIO_OBJECT_TYPE    aot,
        int                 *delay,
        int                  transformFactor,
        const int            headerPeriod,
        ULONG                statesInitFlag
        );

/**
 * \brief             Do delay line buffers housekeeping. To be called after each encoded audio frame.
 * \param hEnvEnc     SBR Encoder handle.
 * \param timeBuffer  Pointer to the encoder audio buffer.
 * \return            0 on success, and non-zero if failed.
 */
INT sbrEncoder_UpdateBuffers(HANDLE_SBR_ENCODER hEnvEnc,
                             INT_PCM *timeBuffer
                            );

/**
 * \brief               Close SBR encoder instance.
 * \param phEbrEncoder  Handle of SBR encoder instance to be closed.
 * \return              void
 */
void sbrEncoder_Close(HANDLE_SBR_ENCODER *phEbrEncoder);

/**
 * \brief               Encode SBR data of one complete audio frame.
 * \param hEnvEncoder   Handle of SBR encoder instance.
 * \param samples       Time samples, always interleaved.
 * \param timeInStride  Channel stride factor of samples buffer.
 * \param sbrDataBits   Size of SBR payload in bits.
 * \param sbrData       SBR payload.
 * \return              0 on success, and non-zero if failed.
 */
INT sbrEncoder_EncodeFrame(HANDLE_SBR_ENCODER  hEnvEncoder,
                           INT_PCM            *samples,
                           UINT                timeInStride,
                           UINT                sbrDataBits[(8)],
                           UCHAR               sbrData[(8)][MAX_PAYLOAD_SIZE]
                          );

/**
 * \brief               Write SBR headers of one SBR element.
 * \param sbrEncoder    Handle of the SBR encoder instance.
 * \param hBs           Handle of bit stream handle to write SBR header to.
 * \param element_index Index of the SBR element which header should be written.
 * \param fSendHeaders  Flag indicating that the SBR encoder should send more headers in the SBR payload or not.
 * \return              void
 */
void sbrEncoder_GetHeader(HANDLE_SBR_ENCODER   sbrEncoder,
                          HANDLE_FDK_BITSTREAM hBs,
                          INT            element_index,
                          int            fSendHeaders);

/**
 * \brief              SBR encoder bitrate estimation.
 * \param hSbrEncoder  SBR encoder handle.
 * \return             Estimated bitrate.
 */
INT sbrEncoder_GetEstimateBitrate(HANDLE_SBR_ENCODER hSbrEncoder);

/**
 * \brief              Delay between input data and downsampled output data.
 * \param hSbrEncoder  SBR encoder handle.
 * \return             Delay.
 */
INT sbrEncoder_GetInputDataDelay(HANDLE_SBR_ENCODER hSbrEncoder);

/**
 * \brief       Get decoder library version info.
 * \param info  Pointer to an allocated LIB_INFO struct, where library info is written to.
 * \return      0 on sucess.
 */
INT sbrEncoder_GetLibInfo(LIB_INFO *info);

void sbrPrintRAM(void);

void sbrPrintROM(void);

#ifdef __cplusplus
        }
#endif

#endif /* ifndef __SBR_MAIN_H */

C++程序 | 420行 | 17.57 KB

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