C++ Sound::readData方法代码示例

int main(int argc, char *argv[])
{
    FMOD::System     *system;
    FMOD::Sound      *sound;
    FMOD_RESULT       result;
    unsigned int      version;

    /*
        Create a System object and initialize.
    */
    result = FMOD::System_Create(&system);
    ERRCHECK(result);

    result = system->getVersion(&version);
    ERRCHECK(result);

    if (version < FMOD_VERSION)
    {
        printf("Error!  You are using an old version of FMOD %08x.  This program requires %08x\n", version, FMOD_VERSION);
        return 0;
    }

    result = system->init(1, FMOD_INIT_NORMAL, 0);
    ERRCHECK(result);

    result = system->createStream("../media/wave.mp3", FMOD_OPENONLY | FMOD_ACCURATETIME, 0, &sound);
    ERRCHECK(result);

    printf("==========================================================================\n");
    printf("Offline Decoding Example.  Copyright (c) Firelight Technologies 2004-2011.\n");
    printf("==========================================================================\n");
    printf("\n");
    printf("This program will open wave.mp3 and decode it into wave.raw using the\n");
    printf("Sound::readData function.\n");
    printf("\n");

    /*
        Decode the sound and write it to a .raw file.
    */
    {
        void *data;
        unsigned int length = 0, read;
        unsigned int bytesread;
        FILE *outfp;

        #define CHUNKSIZE 4096

        result = sound->getLength(&length, FMOD_TIMEUNIT_PCMBYTES);
        ERRCHECK(result);

        outfp = fopen("output.raw", "wb");
        if (!outfp)
        {
            printf("Error!  Could not open output.raw output file.\n");
            return 0;
        }

        data = malloc(CHUNKSIZE);
        if (!data)
        {
            printf("Error!  Failed to allocate %d bytes.\n", CHUNKSIZE);
            return 0;
        }

        bytesread = 0;
        do
        {
            result = sound->readData((char *)data, CHUNKSIZE, &read);

            fwrite((char *)data, read, 1, outfp);
                       
            bytesread += read;

            printf("writing %d bytes of %d to output.raw\r", bytesread, length);
        }
        while (result == FMOD_OK && read == CHUNKSIZE);

        /*
            Loop terminates when either 
            1. the read function returns an error.  (ie FMOD_ERR_FILE_EOF etc).
            2. the amount requested was different to the amount returned. (somehow got an EOF without the file error, maybe a non stream file format like mod/s3m/xm/it/midi).

            If 'bytesread' is bigger than 'length' then it just means that FMOD miscalculated the size, 
            but this will not usually happen if FMOD_ACCURATETIME is used.  (this will give the correct length for VBR formats)
        */

        printf("\n");

        if (outfp)
        {
            fclose(outfp);
        }
    }
        

    printf("\n");

    /*
        Shut down
    */
//.........这里部分代码省略.........

int FMOD_Main()
{
    void *extradriverdata = 0;    
    Common_Init(&extradriverdata);

    /*
        Create a System object and initialize
    */
    FMOD_RESULT result;
    FMOD::System* system;
    result = FMOD::System_Create(&system);
    ERRCHECK(result);

    unsigned int version;
    result = system->getVersion(&version);
    ERRCHECK(result);

    if (version < FMOD_VERSION)
    {
        Common_Fatal("FMOD lib version %08x doesn't match header version %08x", version, FMOD_VERSION);
    }
    
    result = system->init(32, FMOD_INIT_NORMAL, extradriverdata);
    ERRCHECK(result);
        

    /*
        Create a new channel group to hold the convolution DSP unit
    */
    FMOD::ChannelGroup* reverbGroup;
    result = system->createChannelGroup("reverb", &reverbGroup);
    ERRCHECK(result);

    
    /*
        Create a new channel group to hold all the channels and process the dry path
    */
    FMOD::ChannelGroup* mainGroup;
    result = system->createChannelGroup("main", &mainGroup);
    ERRCHECK(result);

    /*
        Create the convultion DSP unit and set it as the tail of the channel group
    */
    FMOD::DSP* reverbUnit;    
    result = system->createDSPByType(FMOD_DSP_TYPE_CONVOLUTIONREVERB, &reverbUnit);
    ERRCHECK(result);
    result = reverbGroup->addDSP(FMOD_CHANNELCONTROL_DSP_TAIL, reverbUnit);
    ERRCHECK(result);

    /*
        Open the impulse response wav file, but use FMOD_OPENONLY as we want
        to read the data into a seperate buffer
    */
    FMOD::Sound* irSound;
    result = system->createSound(Common_MediaPath("standrews.wav"), FMOD_DEFAULT | FMOD_OPENONLY, NULL, &irSound);
    ERRCHECK(result);

    /*
        Retrieve the sound information for the Impulse Response input file
    */
    FMOD_SOUND_FORMAT irSoundFormat;
    FMOD_SOUND_TYPE irSoundType;
    int irSoundBits, irSoundChannels;
    result = irSound->getFormat(&irSoundType, &irSoundFormat, &irSoundChannels, &irSoundBits);
    ERRCHECK(result);
    unsigned int irSoundLength;
    result = irSound->getLength(&irSoundLength, FMOD_TIMEUNIT_PCM);
    ERRCHECK(result);

    
    if (irSoundFormat != FMOD_SOUND_FORMAT_PCM16)
    {
        /*
            For simplicity of the example, if the impulse response is the wrong format just display an error
        */        
        Common_Fatal("Impulse Response file is the wrong audio format");
    }

    /*
        The reverb unit expects a block of data containing a single 16 bit int containing
        the number of channels in the impulse response, followed by PCM 16 data
    */
    unsigned int irDataLength = sizeof(short) * (irSoundLength * irSoundChannels + 1);
    short* irData = (short*)malloc(irDataLength);
    irData[0] = irSoundChannels;
    unsigned int irDataRead;
    result = irSound->readData(&irData[1], irDataLength - sizeof(short), &irDataRead);
    ERRCHECK(result);
    result = reverbUnit->setParameterData(FMOD_DSP_CONVOLUTION_REVERB_PARAM_IR, irData, irDataLength);
    ERRCHECK(result);

    /*
        Don't pass any dry signal from the reverb unit, instead take the dry part
        of the mix from the main signal path
    */
    result = reverbUnit->setParameterFloat(FMOD_DSP_CONVOLUTION_REVERB_PARAM_DRY, -80.0f);    
    ERRCHECK(result);

    /*
//.........这里部分代码省略.........