buffer.h

一个KDE下的录音程序

#ifndef BUFFER_H
#define BUFFER_H

#include <inttypes.h>
#include <qobject.h>
#include <qlistbox.h>

#include "sound.h"

/* ---------------------------------------------------------------------- */
/* *.wav I/O stolen from cdda2wav */

/* Copyright (C) by Heiko Eissfeldt */

typedef uint8_t   BYTE;
typedef uint16_t  WORD;
typedef uint32_t  DWORD;
typedef uint32_t  FOURCC;	/* a four character code */

/* flags for 'wFormatTag' field of WAVEFORMAT */
#define WAVE_FORMAT_PCM 1

/* MMIO macros */
#define mmioFOURCC(ch0, ch1, ch2, ch3) \
  ((DWORD)(BYTE)(ch0) | ((DWORD)(BYTE)(ch1) << 8) | \
  ((DWORD)(BYTE)(ch2) << 16) | ((DWORD)(BYTE)(ch3) << 24))

#define FOURCC_RIFF	mmioFOURCC ('R', 'I', 'F', 'F')
#define FOURCC_LIST	mmioFOURCC ('L', 'I', 'S', 'T')
#define FOURCC_WAVE	mmioFOURCC ('W', 'A', 'V', 'E')
#define FOURCC_FMT	mmioFOURCC ('f', 'm', 't', ' ')
#define FOURCC_DATA	mmioFOURCC ('d', 'a', 't', 'a')

typedef struct CHUNKHDR {
    FOURCC ckid;		/* chunk ID */
    DWORD dwSize; 	        /* chunk size */
} CHUNKHDR;

/* simplified Header for standard WAV files */
typedef struct WAVEHDR {
    CHUNKHDR chkRiff;
    FOURCC fccWave;
    CHUNKHDR chkFmt;
    WORD wFormatTag;	   /* format type */
    WORD nChannels;	   /* number of channels (i.e. mono, stereo, etc.) */
    DWORD nSamplesPerSec;  /* sample rate */
    DWORD nAvgBytesPerSec; /* for buffer estimation */
    WORD nBlockAlign;	   /* block size of data */
    WORD wBitsPerSample;
    CHUNKHDR chkData;
} WAVEHDR;

#define IS_STD_WAV_HEADER(waveHdr) ( \
  waveHdr.chkRiff.ckid == FOURCC_RIFF && \
  waveHdr.fccWave == FOURCC_WAVE && \
  waveHdr.chkFmt.ckid == FOURCC_FMT && \
  waveHdr.chkData.ckid == FOURCC_DATA && \
  waveHdr.wFormatTag == WAVE_FORMAT_PCM)

/* ---------------------------------------------------------------------- */

class AudioBuffer {

protected:
    struct SOUNDPARAMS params;
    int    size;
    int    busy;
    int    position;
    
public:
    AudioBuffer();
    virtual ~AudioBuffer();

    int     clippedsamples;
    int     is_busy();
    void    balloc(void);
    void    bfree(void);
    
    virtual int  start_write(struct SOUNDPARAMS *p); /* write */
    virtual void stop_write();                       /* can flush etc. */

    virtual struct SOUNDPARAMS *get_params();   /* after recording or */
    virtual int   get_size();                   /* for file readling */
    virtual char *name();

    virtual void *read_audio(int len);          /* no comment ... */
    virtual int   write_audio(int len, void *data);
    virtual int   seek(int pos);
    virtual int   tell();
};

class RAMBuffer : public AudioBuffer {
private:
    char **buffers;
    int  bufcount;
    char bufname[32];
    
public:
    RAMBuffer();
    virtual ~RAMBuffer();
    
    virtual int  start_write(struct SOUNDPARAMS *p);
    virtual void stop_write();

    virtual struct SOUNDPARAMS *get_params();
    virtual int   get_size();
    virtual char *name();

    virtual void *read_audio(int len);
    virtual int   write_audio(int len, void *data);
    virtual int   seek(int pos);
    virtual int   tell();    
};

class FileBuffer : public AudioBuffer {
private:
    int      fd,ro;
    int      offset,bstart,bstop;
    char     filename[256];
    WAVEHDR  fileheader;
    char     buffer[65536];

    void     init_header();
    int      parse_header();
    
public:
    FileBuffer();
    virtual ~FileBuffer();

    int     attach(const char *file);

    virtual int  start_write(struct SOUNDPARAMS *p);
    virtual void stop_write();

    virtual struct SOUNDPARAMS *get_params();
    virtual int   get_size();
    virtual char *name();

    virtual void *read_audio(int len);
    virtual int   write_audio(int len, void *data);
    virtual int   seek(int pos);
    virtual int   tell();    
};

/* -- functions -------------------------------------------------------- */

class BufferList : public QObject {
    Q_OBJECT;

public:
    BufferList(QListBox *l, Soundcard *c);
    int add_filebuffer(const char *filename);
    void save_buf(const char *filename);

private:
    QListBox     *listbox;
    Soundcard    *card;
    int           mon,level,wait;

    struct        SOUNDPARAMS params;
    AudioBuffer **buffers;
    int           count,brecord,bplayback;
    int           new_buffer_count;

    int           add_rambuffer();
    void          add_buffer(AudioBuffer *buf);
    void          label_buffer(int buf);
    void          del_buffer(int buf);
    void          istop();
    void          set_pos_size(const char *start, int buf);

public slots:
    void new_params(struct SOUNDPARAMS *params);
    void new_data(void *data);
    void post_data(void *data);

    void new_ram();
    void del_buf();
    void set_level(int l);
    void monitor();
    void record();
    void stop();
    void play();
    void forward();
    void backward();
    void next_buffer();

signals:
    void status(const char *text);
};

#endif