請問各位先進,當小弟執行下列程式碼時 acmStreamOpen總是傳回ACMERR_NOTPOSSIBLE的錯誤 請問要如何解決呢?    ps.如果是PCM 8bits轉PCM 16bits程式又沒問題.

int main(int argc, char* argv[])
{
    MMRESULT mmr;
    WORD wFormatTag = WAVE_FORMAT_GSM610;
        
    HACMDRIVERID hadid = find_driver(wFormatTag);
    if (hadid == NULL) {
        printf("No driver found\n");
        exit(1);
    }
    printf("Driver found (hadid: %4.4lXH)\n", hadid);            HACMDRIVER had = NULL;
    mmr = acmDriverOpen(&had, hadid, 0);
    if (mmr) {
        printf("Failed to open driver\n");
        exit(1);
    }            memset(&wfPCM, 0, sizeof(wfPCM));            // PCM
        wfPCM.cbSize = 0;
        wfPCM.wFormatTag = WAVE_FORMAT_PCM;
        wfPCM.nChannels = 1;
        wfPCM.nSamplesPerSec = 11025;
        wfPCM.wBitsPerSample = 16;
        wfPCM.nBlockAlign = wfPCM.nChannels * wfPCM.wBitsPerSample / 8;        
        wfPCM.nAvgBytesPerSec = wfPCM.nSamplesPerSec * wfPCM.nBlockAlign;            // GSM
        wfDrv.cbSize = 2;
        wfDrv.wFormatTag = WAVE_FORMAT_GSM610;
        wfDrv.nAvgBytesPerSec = 1625;
        wfDrv.nBlockAlign = 65;
        wfDrv.nChannels = 1;
        wfDrv.nSamplesPerSec = 8000;
        wfDrv.wBitsPerSample = 0;            printf("--------------------------------------------------------\n");
        HACMSTREAM hstr = NULL;
    mmr = acmStreamOpen(&hstr,
                        had, 
                        &wfPCM, 
                        &wfDrv, 
                        NULL, 
                        NULL, 
                        0, 
                        ACM_STREAMOPENF_NONREALTIME); 
    if (mmr) {
        printf("Failed to open a stream to do PCM to GSM conversion\n");
                switch(mmr)
                {
                case ACMERR_NOTPOSSIBLE:
                        printf("The requested operation cannot be performed.\n");
                        break;
                case MMSYSERR_INVALFLAG:
                        printf("At least one flag is invalid. \n");
                        break;
                case MMSYSERR_INVALHANDLE:
                        printf("The specified handle is invalid. \n");
                        break;
                case MMSYSERR_INVALPARAM:
                        printf("At least one parameter is invalid. \n");
                        break;
                case MMSYSERR_NOMEM:
                        printf("The system is unable to allocate resources.\n");
                        break; 
                }
        exit(1);
    }
    return 0;
}    

~~~~~~~~~~~~~~~~~~~~~~~ 程式錯誤千萬行, 改來改去費思量, 哀~客戶吵吵又嚷嚷, 真想把他抓來去撞牆。 發表人 - scott777 於 2004/10/21 15:10:38