BASS_StreamCreateFile在WPF中的应用

Question

BASS_StreamCreateFile(path,offset,length,BassFlags)总是返回'0‘。我不知道如何使用这个函数。在BassFlags的使用方面需要帮助。

PS :在WPF声音可视化库的帮助下使用这个。

Answer 1

因为0只通知您有错误，所以您应该检查它是哪种错误：

int BASS_ErrorGetCode();

这将为最近的错误提供错误代码。

下面列出了可能的错误代码(=返回值)：

BASS_ERROR_INIT // BASS_Init has not been successfully called.
BASS_ERROR_NOTAVAIL // Only decoding channels (BASS_STREAM_DECODE) are allowed when using the "no sound" device. The BASS_STREAM_AUTOFREE // flag is also unavailable to decoding channels.
BASS_ERROR_ILLPARAM // The length must be specified when streaming from memory.
BASS_ERROR_FILEOPEN // The file could not be opened.
BASS_ERROR_FILEFORM // The file's format is not recognised/supported.
BASS_ERROR_CODEC    // The file uses a codec that is not available/supported. This can apply to WAV and AIFF files, and also MP3 files when using the "MP3-free" BASS version.
BASS_ERROR_FORMAT   // The sample format is not supported by the device/drivers. If the stream is more than stereo or the BASS_SAMPLE_FLOAT flag is used, it could be that they are not supported.
BASS_ERROR_SPEAKER  // The specified SPEAKER flags are invalid. The device/drivers do not support them, they are attempting to assign a stereo stream to a mono speaker or 3D functionality is enabled.
BASS_ERROR_MEM  // There is insufficient memory.
BASS_ERROR_NO3D // Could not initialize 3D support.
BASS_ERROR_UNKNOWN  // Some other mystery problem! 

(来自bass.h__)

另外，请让正确初始化 BASS --在创建流之前必须调用BASS_Init()：

BOOL BASS_Init(
    int device, // The device to use... -1 = default device, 0 = no sound, 1 = first real output device
    DWORD freq, // Output sample rate
    DWORD flags, // A combination of flags
    HWND win, // The application's main window... 0 = the current foreground window (use this for console applications)
    GUID *clsid // Class identifier of the object to create, that will be used to initialize DirectSound... NULL = use default
);

示例：

int device = -1; // Default device
int freq = 44100; // Sample rate

BASS_Init(device, freq, 0, 0, NULL); // Init BASS