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

/* -----------------------------------------------------------------------------------------------------------
Software License for The Fraunhofer FDK AAC Codec Library for Android

1.    INTRODUCTION
The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software that implements
the MPEG Advanced Audio Coding ("AAC") encoding and decoding scheme for digital audio.
This FDK AAC Codec software is intended to be used on a wide variety of Android devices.

AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient general perceptual
audio codecs. AAC-ELD is considered the best-performing full-bandwidth communications codec by
independent studies and is widely deployed. AAC has been standardized by ISO and IEC as part
of the MPEG specifications.

Patent licenses for necessary patent claims for the FDK AAC Codec (including those of Fraunhofer)
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software may already be covered under those patent licenses when it is used for those licensed purposes only.

Commercially-licensed AAC software libraries, including floating-point versions with enhanced sound quality,
are also available from Fraunhofer. Users are encouraged to check the Fraunhofer website for additional
applications information and documentation.

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Redistribution and use in source and binary forms, with or without modification, are permitted without
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5.    CONTACT INFORMATION

Fraunhofer Institute for Integrated Circuits IIS
Attention: Audio and Multimedia Departments - FDK AAC LL
Am Wolfsmantel 33
91058 Erlangen, Germany

www.iis.fraunhofer.de/amm
amm-info@iis.fraunhofer.de
----------------------------------------------------------------------------------------------------------- */

/**************************  Fraunhofer IIS FDK SysLib  **********************

Author(s):   Eric Allamanche

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

/** \file   wav_file.h
 *  \brief  Rudimentary WAVE file read/write support.
 *
 *  The WAVE file reader/writer is intented to be used in the codec's example
 *  framework for easily getting started with encoding/decoding. Therefore
 *  it serves mainly for helping quickly understand how a codec's API actually
 *  works.
 *  Being a WAVE file reader/writer with very basic functionality, it may not be
 *  able to read WAVE files that come with unusual configurations.
 *  Details on how to use the interface functions can be found in every
 *  (encoder/decoder) example framework.
 */

#ifndef __WAV_FILE_H__
#define __WAV_FILE_H__

#include "genericStds.h"

#ifdef __cplusplus
extern "C" {
#endif

/*!
 * RIFF WAVE file struct.
 * For details see WAVE file format documentation (for example at http://www.wotsit.org).
 */
typedef struct WAV_HEADER
{
  char  riffType[4];
  UINT   riffSize;
  char  waveType[4];
  char  formatType[4];
  UINT   formatSize;
  USHORT compressionCode;
  USHORT numChannels;
  UINT   sampleRate;
  UINT   bytesPerSecond;
  USHORT blockAlign;
  USHORT bitsPerSample;
  char  dataType[4];
  UINT   dataSize;
} WAV_HEADER;

struct WAV
{
  WAV_HEADER header;
  FDKFILE *fp;
};

typedef struct WAV *HANDLE_WAV;

/**
 * \brief  Open a WAV file handle for reading.
 *
 * \param pWav      Pointer to a memory location, where a WAV handle is returned.
 * \param filename  File name to be opened.
 *
 * \return  0 on success and non-zero on failure.
 */
INT WAV_InputOpen (HANDLE_WAV *pWav, const char *filename);

/**
 * \brief  Read samples from a WAVE file. The samples are automatically re-ordered to the
 *         native host endianess and scaled to full scale of the INT_PCM type, from
 *         whatever BPS the WAVE file had specified in its header data.
 *
 *  \param wav           Handle of WAV file.
 *  \param sampleBuffer  Pointer to store audio data.
 *  \param numSamples    Desired number of samples to read.
 *  \param nBufBits      Size in bit of each audio sample of sampleBuffer.
 *
 *  \return  Number of samples actually read.
 */
INT WAV_InputRead (HANDLE_WAV wav, void *sampleBuffer, UINT numSamples, int nBufBits);

/**
 * \brief       Close a WAV file reading handle.
 * \param pWav  Pointer to a WAV file reading handle.
 * \return      void
 */
void WAV_InputClose(HANDLE_WAV *pWav);

/**
 * \brief  Open WAV output/writer handle.
 *
 * \param pWav            Pointer to WAV handle to be returned.
 * \param outputFilename  File name of the file to be written to.
 * \param sampleRate      Desired samplerate of the resulting WAV file.
 * \param numChannels     Desired number of audio channels of the resulting WAV file.
 * \param bitsPerSample   Desired number of bits per audio sample of the resulting WAV file.
 *
 * \return  0: ok; -1: error
 */
INT WAV_OutputOpen(HANDLE_WAV *pWav, const char *outputFilename, INT sampleRate, INT numChannels, INT bitsPerSample);

/**
 * \brief  Write data to WAV file asociated to WAV handle.
 *
 * \param wav              Handle of WAV file
 * \param sampleBuffer     Pointer to audio samples, right justified integer values.
 * \param numberOfSamples  The number of individual audio sample valuesto be written.
 * \param nBufBits         Size in bits of each audio sample in sampleBuffer.
 * \param nSigBits         Amount of significant bits of each nBufBits in sampleBuffer.
 *
 * \return 0: ok; -1: error
 */
INT WAV_OutputWrite(HANDLE_WAV wav, void *sampleBuffer, UINT numberOfSamples, int nBufBits, int nSigBits);

/**
 * \brief       Close WAV output handle.
 * \param pWav  Pointer to WAV handle. *pWav is set to NULL.
 * \return      void
 */
void WAV_OutputClose(HANDLE_WAV *pWav);

#ifdef __cplusplus
}
#endif

#endif /* __WAV_FILE_H__ */

C++程序 | 213行 | 8.41 KB

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