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

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

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

#define SPEAKER_FRONT_LEFT             0x1
#define SPEAKER_FRONT_RIGHT            0x2
#define SPEAKER_FRONT_CENTER           0x4
#define SPEAKER_LOW_FREQUENCY          0x8
#define SPEAKER_BACK_LEFT              0x10
#define SPEAKER_BACK_RIGHT             0x20
#define SPEAKER_FRONT_LEFT_OF_CENTER   0x40
#define SPEAKER_FRONT_RIGHT_OF_CENTER  0x80
#define SPEAKER_BACK_CENTER            0x100
#define SPEAKER_SIDE_LEFT              0x200
#define SPEAKER_SIDE_RIGHT             0x400
#define SPEAKER_TOP_CENTER             0x800
#define SPEAKER_TOP_FRONT_LEFT         0x1000
#define SPEAKER_TOP_FRONT_CENTER       0x2000
#define SPEAKER_TOP_FRONT_RIGHT        0x4000
#define SPEAKER_TOP_BACK_LEFT          0x8000
#define SPEAKER_TOP_BACK_CENTER        0x10000
#define SPEAKER_TOP_BACK_RIGHT         0x20000
#define SPEAKER_RESERVED               0x80000000

/*!
 * 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;
  UINT channelMask;
};

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 | 234行 | 9.27 KB

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