libcm is a C development framework with an emphasis on audio signal processing applications.
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  1. /// \file cmAudioFile.h
  2. /// \brief Audio file reader/writer class.
  3. ///
  4. /// This class supports reading uncompressed AIFF and WAV files and writing uncompressed AIFF files.
  5. /// The reading and writing routines are known to work with 8,16,24, and 32 bit integer sample formats.
  6. ///
  7. /// Testing and example usage for this API can be found in cmProcTest.c cmAudioReadWriteTest().
  8. ///
  9. /// Usage example:
  10. /// \snippet cmAudioFile.c cmAudioFileExample
  11. #ifndef cmAudioFile_h
  12. #define cmAudioFile_h
  13. #ifdef __cplusplus
  14. extern "C" {
  15. #endif
  16. #ifndef cmAudioFile_MAX_FRAME_READ_CNT
  17. /// Maximum number of samples which will be read in one call to fread().
  18. /// This value is only significant in that an internal buffer is created on the stack
  19. /// whose size must be limited to prevent stack overflows.
  20. #define cmAudioFile_MAX_FRAME_READ_CNT (8192)
  21. #endif
  22. /// Audio file result codes.
  23. enum
  24. {
  25. kOkAfRC = 0,
  26. kOpenFailAfRC,
  27. kReadFailAfRC,
  28. kWriteFailAfRC,
  29. kSeekFailAfRC,
  30. kCloseFailAfRC,
  31. kNotAiffAfRC,
  32. kInvalidBitWidthAfRC,
  33. kInvalidFileModeAfRC,
  34. kInvalidHandleAfRC,
  35. kInvalidChCountAfRC,
  36. kUnknownErrAfRC
  37. };
  38. /// Informational flags used by audioFileInfo
  39. enum
  40. {
  41. kAiffAfFl = 0x01, ///< this is an AIFF file
  42. kWavAfFl = 0x02, ///< this is a WAV file
  43. kSwapAfFl = 0x04, ///< file header bytes must be swapped
  44. kAifcAfFl = 0x08, ///< this is an AIFC file
  45. kSwapSamplesAfFl = 0x10 ///< file sample bytes must be swapped
  46. };
  47. /// Constants
  48. enum
  49. {
  50. kAudioFileLabelCharCnt = 256,
  51. kAfBextDescN = 256,
  52. kAfBextOriginN = 32,
  53. kAfBextOriginRefN = 32,
  54. kAfBextOriginDateN = 10,
  55. kAfBextOriginTimeN = 8
  56. };
  57. /// Aiff marker record
  58. typedef struct
  59. {
  60. unsigned id;
  61. unsigned frameIdx;
  62. char label[kAudioFileLabelCharCnt];
  63. } cmAudioFileMarker_t;
  64. /// Broadcast WAV header record As used by ProTools audio files. See http://en.wikipedia.org/wiki/Broadcast_Wave_Format
  65. /// When generated from Protools the timeRefLow/timeRefHigh values appear to actually refer
  66. /// to the position on the Protools time-line rather than the wall clock time.
  67. typedef struct
  68. {
  69. char desc[ kAfBextDescN + 1 ];
  70. char origin[ kAfBextOriginN + 1 ];
  71. char originRef[ kAfBextOriginRefN + 1 ];
  72. char originDate[kAfBextOriginDateN + 1 ];
  73. char originTime[kAfBextOriginTimeN + 1 ];
  74. unsigned timeRefLow; // sample count since midnight low word
  75. unsigned timeRefHigh; // sample count since midnight high word
  76. } cmAudioFileBext_t;
  77. /// Audio file information record used by audioFileNew and audioFileOpen
  78. typedef struct
  79. {
  80. unsigned bits; ///< bits per sample
  81. unsigned chCnt; ///< count of audio file channels
  82. double srate; ///< audio file sample rate in samples per second
  83. unsigned frameCnt; ///< total number of sample frames in the audio file
  84. unsigned flags; ///< informational flags
  85. unsigned markerCnt; ///< count of markers in markerArray
  86. cmAudioFileMarker_t* markerArray; ///< array of markers
  87. cmAudioFileBext_t bextRecd; ///< only used with Broadcast WAV files
  88. } cmAudioFileInfo_t;
  89. typedef cmHandle_t cmAudioFileH_t; ///< opaque audio file handle
  90. extern cmAudioFileH_t cmNullAudioFileH; ///< NULL audio file handle
  91. /// Create an audio file handle and optionally use the handle to open an audio file.
  92. ///
  93. /// \param fn The audio file name to open or NULL to create the audio file handle without opening the file.
  94. /// \param infoPtr A pointer to an audioFileInfo record to be filled when the file is open or NULL to ignore.
  95. /// \param rcPtr A pointer to a result code to be set in the event of a runtime error or NULL to ignore.
  96. /// \param rpt A pointer to a cmRpt_t object which error messages from this class will be directed to.
  97. /// \retval cmAudioFileH_t A new audio file handle.
  98. ///
  99. cmAudioFileH_t cmAudioFileNewOpen( const cmChar_t* fn, cmAudioFileInfo_t* infoPtr, cmRC_t* rcPtr, cmRpt_t* rpt );
  100. /// Open an audio file for writing
  101. cmAudioFileH_t cmAudioFileNewCreate( const cmChar_t* fn, double srate, unsigned bits, unsigned chCnt, cmRC_t* rcPtr, cmRpt_t* rpt );
  102. /// Open an audio file for reading using a handle returned from an earlier call to audioFileNewXXX().
  103. ///
  104. /// \param h A file handle returned from and earlier call to cmAudioFileNewOpen() or cmAudioFileNewCreate().
  105. /// \param fn The audio file name to open or NULL to create the audio file handle without opening the file.
  106. /// \param infoPtr A pointer to an audioFileInfo record to be filled when the file is open or NULL to ignore.
  107. /// \retval Returns an cmRC_t value indicating the success (kOkAfRC) or failure of the call.
  108. ///
  109. /// If the audio file handle 'h' refers to an open file then it is automatically closed prior to being
  110. /// reopened with the new file.
  111. cmRC_t cmAudioFileOpen( cmAudioFileH_t h, const cmChar_t* fn, cmAudioFileInfo_t* infoPtr );
  112. /// Open an audio file for writing. The type of the audio file, AIF or WAV
  113. /// is determined by the file name extension.
  114. cmRC_t cmAudioFileCreate(
  115. cmAudioFileH_t h, ///< Handle returned from an earlier call to cmAudioFileNewCreate() or cmAudioFileNewOpen().
  116. const cmChar_t* fn, ///< File name of the new file.
  117. double srate, ///< Sample rate of the new file.
  118. unsigned bits, ///< Sample word width for the new file in bits (must be 8,16,24 or 32).
  119. unsigned chCnt ///< Audio channel count for the new file.
  120. );
  121. /// Close a the file associated with handle 'h' but do not release the handle.
  122. /// If the file was opened for writing (cmAudioFileCreate()) then this function will
  123. /// write the file header prior to closing the file.
  124. cmRC_t cmAudioFileClose( cmAudioFileH_t* h );
  125. /// Close the file associated with handle 'h' (via an internal call to
  126. /// cmAudioFileClose()) and release the handle and any resources
  127. /// associated with it. This is the complement to cmAudioFileOpen/Create().
  128. cmRC_t cmAudioFileDelete( cmAudioFileH_t* h );
  129. /// Return true if the handle is not closed or deleted.
  130. bool cmAudioFileIsValid( cmAudioFileH_t h );
  131. /// Return true if the handle is open.
  132. bool cmAudioFileIsOpen( cmAudioFileH_t h );
  133. /// Return true if the current file position is at the end of the file.
  134. bool cmAudioFileIsEOF( cmAudioFileH_t h );
  135. /// Return the current file position as a frame index.
  136. unsigned cmAudioFileTell( cmAudioFileH_t h );
  137. /// Set the current file position as an offset from the first frame.
  138. cmRC_t cmAudioFileSeek( cmAudioFileH_t h, unsigned frmIdx );
  139. /// \name Sample Reading Functions.
  140. ///@{
  141. /// Fill a user suppled buffer with up to frmCnt samples.
  142. /// If less than frmCnt samples are available at the specified audio file location then the unused
  143. /// buffer space is set to zero. Check *actualFrmCntPtr for the count of samples actually available
  144. /// in the return buffer. Functions which do not include a begFrmIdx argument begin reading from
  145. /// the current file location (see cmAudioFileSeek()). The buf argument is always a pointer to an
  146. /// array of pointers of length chCnt. Each channel buffer specified in buf[] must contain at least
  147. /// frmCnt samples.
  148. ///
  149. /// \param h An audio file handle returned from an earlier call to audioFileNew()
  150. /// \param fn The name of the audio file to read.
  151. /// \param begFrmIdx The frame index of the first sample to read. Functions that do not use this parameter begin reading at the current file location (See cmAudioFileTell()).
  152. /// \param frmCnt The number of samples allocated in buf.
  153. /// \param chIdx The index of the first channel to read.
  154. /// \param chCnt The count of channels to read.
  155. /// \param buf An array containing chCnt pointers to arrays of frmCnt samples.
  156. /// \param actualFrmCntPtr The number of frames actually written to the return buffer (ignored if NULL)
  157. cmRC_t cmAudioFileReadInt( cmAudioFileH_t h, unsigned frmCnt, unsigned chIdx, unsigned chCnt, int** buf, unsigned* actualFrmCntPtr );
  158. cmRC_t cmAudioFileReadFloat( cmAudioFileH_t h, unsigned frmCnt, unsigned chIdx, unsigned chCnt, float** buf, unsigned* actualFrmCntPtr );
  159. cmRC_t cmAudioFileReadDouble( cmAudioFileH_t h, unsigned frmCnt, unsigned chIdx, unsigned chCnt, double** buf, unsigned* actualFrmCntPtr );
  160. cmRC_t cmAudioFileGetInt( const char* fn, unsigned begFrmIdx, unsigned frmCnt, unsigned chIdx, unsigned chCnt, int** buf, unsigned* actualFrmCntPtr, cmAudioFileInfo_t* afInfoPtr, cmRpt_t* rpt );
  161. cmRC_t cmAudioFileGetFloat( const char* fn, unsigned begFrmIdx, unsigned frmCnt, unsigned chIdx, unsigned chCnt, float** buf, unsigned* actualFrmCntPtr, cmAudioFileInfo_t* afInfoPtr, cmRpt_t* rpt );
  162. cmRC_t cmAudioFileGetDouble( const char* fn, unsigned begFrmIdx, unsigned frmCnt, unsigned chIdx, unsigned chCnt, double** buf, unsigned* actualFrmCntPtr, cmAudioFileInfo_t* afInfoPtr, cmRpt_t* rpt );
  163. ///@}
  164. /// \name Sum the returned samples into the output buffer.
  165. ///@{
  166. cmRC_t cmAudioFileReadSumInt( cmAudioFileH_t h, unsigned frmCnt, unsigned chIdx, unsigned chCnt, int** buf, unsigned* actualFrmCntPtr );
  167. cmRC_t cmAudioFileReadSumFloat( cmAudioFileH_t h, unsigned frmCnt, unsigned chIdx, unsigned chCnt, float** buf, unsigned* actualFrmCntPtr );
  168. cmRC_t cmAudioFileReadSumDouble( cmAudioFileH_t h, unsigned frmCnt, unsigned chIdx, unsigned chCnt, double** buf, unsigned* actualFrmCntPtr );
  169. cmRC_t cmAudioFileGetSumInt( const char* fn, unsigned begFrmIdx, unsigned frmCnt, unsigned chIdx, unsigned chCnt, int** buf, unsigned* actualFrmCntPtr, cmAudioFileInfo_t* afInfoPtr, cmRpt_t* rpt );
  170. cmRC_t cmAudioFileGetSumFloat( const char* fn, unsigned begFrmIdx, unsigned frmCnt, unsigned chIdx, unsigned chCnt, float** buf, unsigned* actualFrmCntPtr, cmAudioFileInfo_t* afInfoPtr, cmRpt_t* rpt );
  171. cmRC_t cmAudioFileGetSumDouble( const char* fn, unsigned begFrmIdx, unsigned frmCnt, unsigned chIdx, unsigned chCnt, double** buf, unsigned* actualFrmCntPtr, cmAudioFileInfo_t* afInfoPtr, cmRpt_t* rpt );
  172. ///@}
  173. ///@}
  174. /// \name Sample Writing Functions
  175. ///@{
  176. cmRC_t cmAudioFileWriteInt( cmAudioFileH_t h, unsigned frmCnt, unsigned chCnt, int** bufPtrPtr );
  177. cmRC_t cmAudioFileWriteFloat( cmAudioFileH_t h, unsigned frmCnt, unsigned chCnt, float** bufPtrPtr );
  178. cmRC_t cmAudioFileWriteDouble( cmAudioFileH_t h, unsigned frmCnt, unsigned chCnt, double** bufPtrPtr );
  179. cmRC_t cmAudioFileWriteFileInt( const char* fn, double srate, unsigned bit, unsigned frmCnt, unsigned chCnt, int** bufPtrPtr, cmRpt_t* rpt );
  180. cmRC_t cmAudioFileWriteFileFloat( const char* fn, double srate, unsigned bit, unsigned frmCnt, unsigned chCnt, float** bufPtrPtr, cmRpt_t* rpt );
  181. cmRC_t cmAudioFileWriteFileDouble( const char* fn, double srate, unsigned bit, unsigned frmCnt, unsigned chCnt, double** bufPtrPtr, cmRpt_t* rpt );
  182. ///@}
  183. /// \name cmSample_t and cmReal_t Alias Macros
  184. ///@{
  185. /// Alias the cmSample_t and cmReal_t sample reading and writing functions to the appropriate
  186. /// type based on #CM_FLOAT_SMP and #CM_FLOAT_REAL.
  187. #if CM_FLOAT_SMP == 1
  188. #define cmAudioFileReadSample cmAudioFileReadFloat
  189. #define cmAudioFileReadSumSample cmAudioFileReadSumFloat
  190. #define cmAudioFileGetSample cmAudioFileGetFloat
  191. #define cmAudioFileGetSumSample cmAudioFileGetSumFloat
  192. #define cmAudioFileWriteSample cmAudioFileWriteFloat
  193. #define cmAudioFileWriteFileSample cmAudioFileWriteFileFloat
  194. #else
  195. #define cmAudioFileReadSample cmAudioFileReadDouble
  196. #define cmAudioFileReadSumSample cmAudioFileReadSumDouble
  197. #define cmAudioFileGetSample cmAudioFileGetDouble
  198. #define cmAudioFileGetSumSample cmAudioFileGetSumDouble
  199. #define cmAudioFileWriteSample cmAudioFileWriteDouble
  200. #define cmAudioFileWriteFileSample cmAudioFileWriteFileDouble
  201. #endif
  202. #if CM_FLOAT_REAL == 1
  203. #define cmAudioFileReadReal cmAudioFileReadFloat
  204. #define cmAudioFileReadSumReal cmAudioFileReadSumFloat
  205. #define cmAudioFileGetReal cmAudioFileGetFloat
  206. #define cmAudioFileGetSumReal cmAudioFileGetSumFloat
  207. #define cmAudioFileWriteReal cmAudioFileWriteFloat
  208. #define cmAudioFileWriteFileReal cmAudioFileWriteFileFloat
  209. #else
  210. #define cmAudioFileReadReal cmAudioFileReadDouble
  211. #define cmAudioFileReadSumReal cmAudioFileReadSumDouble
  212. #define cmAudioFileGetReal cmAudioFileGetDouble
  213. #define cmAudioFileGetSumReal cmAudioFileGetSumDouble
  214. #define cmAudioFileWriteReal cmAudioFileWriteDouble
  215. #define cmAudioFileWriteFileReal cmAudioFileWriteFileDouble
  216. #endif
  217. ///@}
  218. /// \name Minimum, Maximum, Mean
  219. ///@{
  220. /// Scan an entire audio file and return the minimum, maximum and mean sample value.
  221. /// On error *minPtr, *maxPtr, and *meanPtr are set to -acSample_MAX, cmSample_MAX, and 0 respectively
  222. cmRC_t cmAudioFileMinMaxMean( cmAudioFileH_t h, unsigned chIdx, cmSample_t* minPtr, cmSample_t* maxPtr, cmSample_t* meanPtr );
  223. cmRC_t cmAudioFileMinMaxMeanFn( const cmChar_t* fn, unsigned chIdx, cmSample_t* minPtr, cmSample_t* maxPtr, cmSample_t* meanPtr, cmRpt_t* rpt );
  224. ///@}
  225. /// Return the file name associated with a audio file handle.
  226. const cmChar_t* cmAudioFileName( cmAudioFileH_t h );
  227. /// Given an error code return the associated message.
  228. const char* cmAudioFileErrorMsg( unsigned rc );
  229. /// \name Get information about an audio file
  230. ///@{
  231. /// Return the cmAudioFileInfo_t record associated with a file.
  232. cmRC_t cmAudioFileGetInfo( const cmChar_t* fn, cmAudioFileInfo_t* infoPtr, cmRpt_t* rpt );
  233. /// Print the cmAudioFileInfo_t to a file.
  234. void cmAudioFilePrintInfo( const cmAudioFileInfo_t* infoPtr, cmRpt_t* );
  235. /// Print the file header information and frmCnt sample values beginning at frame index frmIdx.
  236. cmRC_t cmAudioFileReport( cmAudioFileH_t h, cmRpt_t* rpt, unsigned frmIdx, unsigned frmCnt );
  237. /// Print the file header information and frmCnt sample values beginning at frame index frmIdx.
  238. cmRC_t cmAudioFileReportFn( const cmChar_t* fn, unsigned frmIdx, unsigned frmCnt, cmRpt_t* rpt );
  239. ///@}
  240. /// Change the sample rate value in the header. Note that this function does not resample the audio
  241. /// signal it simply changes the value of the sample rate in the header.
  242. cmRC_t cmAudioFileSetSrate( const cmChar_t* audioFn, unsigned srate );
  243. // Generate a sine tone and write it to a file.
  244. cmRC_t cmAudioFileSine( cmCtx_t* ctx, const cmChar_t* fn, double srate, unsigned bits, double hz, double gain, double secs );
  245. /// Testing and example routine for functions in cmAudioFile.h.
  246. /// Also see cmProcTest.c cmAudioFileReadWriteTest()
  247. void cmAudioFileTest( cmCtx_t* ctx, int argc, const char* argv[] );
  248. #ifdef __cplusplus
  249. }
  250. #endif
  251. #endif