C/C++ Bitwise OR以及如何解释它

Question

我完全不知道按位OR的东西.

所以这是我的问题.我正在使用库libsndfile.我用它来读取分析音频文件.我需要告诉音频文件的比特率.

我读了一个24位的wav音频文件.api提供了一种字段格式,格式设置为65539.

文档告诉我这个:

上述SF_INFO结构中的格式字段由主要格式类型的逐位OR(0x10000和0x08000000之间的值),次要格式类型(值小于0x10000)和可选的endian-ness值组成.

以下是一些可能的值:

      SF_FORMAT_WAV          = 0x010000,     /* Microsoft WAV format (little endian). */
      SF_FORMAT_AIFF         = 0x020000,     /* Apple/SGI AIFF format (big endian). */
      SF_FORMAT_AU           = 0x030000,     /* Sun/NeXT AU format (big endian). */
      SF_FORMAT_RAW          = 0x040000,     /* RAW PCM data. */
      SF_FORMAT_PAF          = 0x050000,     /* Ensoniq PARIS file format. */
      SF_FORMAT_SVX          = 0x060000,     /* Amiga IFF / SVX8 / SV16 format. */
      SF_FORMAT_NIST         = 0x070000,     /* Sphere NIST format. */
      SF_FORMAT_VOC          = 0x080000,     /* VOC files. */
      SF_FORMAT_IRCAM        = 0x0A0000,     /* Berkeley/IRCAM/CARL */
      SF_FORMAT_W64          = 0x0B0000,     /* Sonic Foundry's 64 bit RIFF/WAV */
      SF_FORMAT_MAT4         = 0x0C0000,     /* Matlab (tm) V4.2 / GNU Octave 2.0 */
      SF_FORMAT_MAT5         = 0x0D0000,     /* Matlab (tm) V5.0 / GNU Octave 2.1 */
      SF_FORMAT_PVF          = 0x0E0000,     /* Portable Voice Format */
      SF_FORMAT_XI           = 0x0F0000,     /* Fasttracker 2 Extended Instrument */
      SF_FORMAT_HTK          = 0x100000,     /* HMM Tool Kit format */
      SF_FORMAT_SDS          = 0x110000,     /* Midi Sample Dump Standard */
      SF_FORMAT_AVR          = 0x120000,     /* Audio Visual Research */
      SF_FORMAT_WAVEX        = 0x130000,     /* MS WAVE with WAVEFORMATEX */
      SF_FORMAT_SD2          = 0x160000,     /* Sound Designer 2 */
      SF_FORMAT_FLAC         = 0x170000,     /* FLAC lossless file format */
      SF_FORMAT_CAF          = 0x180000,     /* Core Audio File format */
      SF_FORMAT_WVE          = 0x190000,     /* Psion WVE format */
      SF_FORMAT_OGG          = 0x200000,     /* Xiph OGG container */
      SF_FORMAT_MPC2K        = 0x210000,     /* Akai MPC 2000 sampler */
      SF_FORMAT_RF64         = 0x220000,     /* RF64 WAV file */

      /* Subtypes from here on. */

      SF_FORMAT_PCM_S8       = 0x0001,       /* Signed 8 bit data */
      SF_FORMAT_PCM_16       = 0x0002,       /* Signed 16 bit data */
      SF_FORMAT_PCM_24       = 0x0003,       /* Signed 24 bit data */
      SF_FORMAT_PCM_32       = 0x0004,       /* Signed 32 bit data */

我的一个大问题是:我如何分析格式= 65539来告诉主要类型和子类型？

非常感谢提前.

Answer 1

只需将其插入桌面上的计算器并转换为十六进制:

65539 == 0x010003

这就是说:

65539 == (0x010000) | (0x3)

看起来像SF_FORMAT_WAV | SF_FORMAT_PCM_24.