mirror of
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279 lines
11 KiB
Plaintext
279 lines
11 KiB
Plaintext
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MoonShell plugin converted by Moonlight. (2006/12/22)
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/////////////////////////////////////////////////////////////////////////////
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////////////////// THE LOSSLESS TRUE AUDIO CODEC LIBRARY ////////////////////
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/////////////////////////////////////////////////////////////////////////////
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This package contains a full-futured CODEC library for realtime encoding and
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decoding of True Audio (TTA) files.
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The library has a 3 interface classes and 2 functions, which provides a
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possibility to work in applications of any complexity.
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For maintenance of namespace wholeness, all functions and library classes
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are transferred out to the separate namespace, named TTALib.
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For a simplicity of work with library namespace it's possible to use a
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command:
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using namespace TTALib;
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/////////////////////////////////////////////////////////////////////////////
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/////////////////// Wav2TTA, TTA2Wav & TTATest functions ////////////////////
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/////////////////////////////////////////////////////////////////////////////
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For a simple use of the library we provide 3 basic functions:
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TTAError Wav2TTA ( const char *infile,
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const char *outfile,
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bool CopyID3v2Tag = true,
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TTACALLBACK TTACallback = NULL,
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void *uParam = NULL );
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The Wav2TTA function is intended for convert a WAV files into the TTA format.
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Description of the function parameters:
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infile - the name of the input WAV file;
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outfile - the name of the output TTA file;
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CopyID3v2Tag - copy ID3v2 tag if it's present;
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TTACallback - bool (*TTACALLBACK)(const TTAStat &stat, void *uParam),
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the callback function, intended for the extension of
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possibilities of the user program. Can be used to get
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a statistics of the encoding process. This parameter
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must be set to NULL if not used. The callback function
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must return 'true' to continue of the encoding process,
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or 'false' to interrupt it. In this case the Wav2TTA
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function will return the TTA_CANCELED error.
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uParam - users parameter, can be set to NULL;
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The TTA2Wav function is intended for convert a TTA files into the Wav format.
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TTAError TTA2Wav ( const char *infile,
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const char *outfile,
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bool CopyID3v2Tag = true,
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TTACALLBACK TTACallback = NULL,
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void *uParam = NULL );
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Description of the function parameters:
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infile - the name of the input TTA file;
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outfile - the name of the output WAV file;
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CopyID3v2Tag - copy ID3v2 tag if it's present;
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TTACallback - bool (*TTACALLBACK)(const TTAStat &stat, void *uParam),
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the callback function, intended for the extension of
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possibilities of the user program. Can be used to get
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a statistics of the decoding process. This parameter
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must be set to NULL if not used. The callback function
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must return 'true' to continue of the decoding process,
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or 'false' to interrupt it. In this case the TTA2Wav
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function will return the TTA_CANCELED error.
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uParam - users parameter, can be set to NULL;
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The TTA2Test function is intended for test a TTA files for errors.
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TTAError TTATest ( const char *infile,
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TTACALLBACK TTACallback = NULL,
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void *uParam = NULL );
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Description of the function parameters:
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infile - the name of the input TTA file;
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TTACallback - bool (*TTACALLBACK)(const TTAStat &stat, void *uParam),
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the callback function, intended for the extension of
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possibilities of the user program. Can be used to get
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a statistics of the testing process. This parameter
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must be set to NULL if not used. The callback function
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must return 'true' to continue of the testing process,
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or 'false' to interrupt it. In this case the TTA2Wav
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function will return the TTA_CANCELED error.
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uParam - users parameter, can be set to NULL;
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All of these functions returns the values of the TTAError type.
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The error code can be easily converted into the text string, by calling the
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GetErrStr() function, accepting a error code as a parameter.
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/////////////////////////////////////////////////////////////////////////////
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//////////////// TTAEncoder, TTADecoder & WavFile classes ///////////////////
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/////////////////////////////////////////////////////////////////////////////
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For using this library in advanced applications the TTAEncoder, TTADecoder
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and the WavFile interface classes can be used.
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============================================================================
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TTAEncoder class
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============================================================================
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The TTAEncoder class is intended for coding PCM data with into the TTA file.
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The TTAEncoder class has a 2 constructors:
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TTAEncoder( const char *filename,
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bool append,
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unsigned short AudioFormat,
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unsigned short NumChannels,
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unsigned short BitsPerSample,
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unsigned long SampleRate,
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unsigned long DataLength );
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TTAEncoder( HANDLE hInFile,
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bool append,
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unsigned short AudioFormat,
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unsigned short NumChannels,
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unsigned short BitsPerSample,
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unsigned long SampleRate,
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unsigned long DataLength );
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The first of these 2 constructors accepts the name of the input file,
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secondary constructor accepts the input file handle. The 'append' parameter
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can be used to open input file for writing at the end of the file
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(appending); creates the file first if it doesn't exist.
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The other parameters contains the information about the stream:
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AudioFormat - audio format:
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WAVE_FORMAT_PCM or WAVE_FORMAT_IEEE_FLOAT;
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NumChannels - number of channels;
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BitsPerSample - count of bits per sample;
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SampleRate - sample rate;
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DataLength - overall number of input samples in file.
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The CompressBlock function can be used to compress a chunk of the input data:
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bool CompressBlock (long *buffer, long bufLen);
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Description of the function parameters:
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buffer - input data buffer;
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bufLen - buffer length (number of input samples).
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Returns 'true' on success and 'false' on failure.
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The GetStat() function allows to get a compression statistics.
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TTAStat GetStat();
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This function returns the TTAStat strucure:
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struct TTAStat
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{
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double ratio;
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unsigned long input_bytes;
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unsigned long output_bytes;
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};
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Description of the structure fields:
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ratio - compression ratio;
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input_bytes - count of input bytes processed;
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input_bytes - count of output bytes saved.
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============================================================================
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TTADecoder class
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============================================================================
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The TTADecoder class is intended for decoding of the TTA audio files.
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The TTADecoder class has a 2 constructors:
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TTADecoder (const char *filename);
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TTADecoder (HANDLE hInFile);
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The first of these 2 constructors accepts the name of the input file,
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secondary constructor accepts the input file handle.
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The next set of functions can be used to retrieve the information about the
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stream:
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GetAudioFormat() - returns the audio format:
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WAVE_FORMAT_PCM or WAVE_FORMAT_IEEE_FLOAT;
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GetNumChannels() - returns the number of channels;
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GetBitsPerSample() - returns the count of bits per sample;
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GetSampleRate() - returns the sample rate;
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GetDataLength() - returns the overall number of input samples
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in file.
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The CompressBlock function can be used to get a chunk of the decompressed
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data.
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long GetBlock (long **buffer);
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Returns the decompressed data into the 'buffer' and the buffer length (count
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of samples) as a function value. Returns 0 if the end-of-file is reached.
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The GetStat() function allows to get a decompression statistics.
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TTAStat GetStat();
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This function returns the the structure which has a TTAStat type, described
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above.
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If an error occurs, the both of TTAEncoder and TTADecoder classes generates
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exceptions of the TTAException type. The error code can be retrieved by
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GetErrNo function of the exception value. The returned error code can be
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converted into the text string by the GetErrStr() function, which accepts the
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error value as a parameter.
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============================================================================
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WavFile class
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============================================================================
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The WavFile class provides a simple interface to work with a WAV format files.
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The error code can be retrieved by GetErrNo function. The returned error code
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can be converted into the text string by the GetErrStr() function, which
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accepts the error value as a parameter.
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HANDLE Create(const char *filename);
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Creates the WAV file with a name, specified by the 'filename' parameter.
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Returns the file HANDLE or INVALID_HANDLE_VALUE on error.
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HANDLE Open(const char *filename);
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Opens WAV file to read. Function accepts the file name as a parameter and
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returns the file HANDLE or INVALID_HANDLE_VALUE on error.
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bool ReadHeaders();
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This function is intended to get WAV file headers. Then, the read parameters
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can be retrieved from class attributes 'wave_hdr' and 'subchunk_hdr'.
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Function returns 'true' on success and 'false' on failure.
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bool Read(long *data, long byte_size, unsigned long *len);
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The function reads 'len' samples of data, each size 'byte_size' bytes, from
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the input file into the buffer 'data'. Function returns 'true' on success
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and 'false' on failure.
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bool WriteHeaders();
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This function is intended to write WAV file headers. The writing headers
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will be retrieved from class attributes 'wave_hdr' and 'subchunk_hdr'.
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Function returns 'true' on success and 'false' on failure.
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bool Write(long *data, long byte_size, long num_chan,
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unsigned long *len);
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The function writes 'len' samples of data, each size 'byte_size' bytes,
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into the output file from the buffer 'data'. The 'num_chan' parameter
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defines the number of audio channels. Function returns 'true' on success
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and 'false' on failure. The actually wrote number of samples will be
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returned back by the 'len' parameter.
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void Close(); // Closes the WAV file
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TTAError GetErrNo() const; // Returns the error code.
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The returned error code can be converted into the text string by the
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GetErrStr() function, which accepts the error value as a parameter.
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/////////////////////////////////////////////////////////////////////////////
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/////////////////////////////////////////////////////////////////////////////
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Copyright (c) 2004 Alexander Djourik. All rights reserved.
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Copyright (c) 2004 Pavel Zhilin. All rights reserved.
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For the latest in news and downloads, please visit the official True Audio
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project site: http://tta.sourceforge.net
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