B î&]\1ã@s¾dZddlmZmZmZddlZddlZddlZddlZdddgZ Gdd„de ƒZ dZ d Z d Ze e fZd d „Zddd„Zdd„Zdd„Zddd„Zdd„Zejdd kr²dd„Zndd„ZdS)z Module to read / write wav files using numpy arrays Functions --------- `read`: Return the sample rate (in samples/sec) and data from a WAV file. `write`: Write a numpy array as a WAV file. é)ÚdivisionÚprint_functionÚabsolute_importNÚWavFileWarningÚreadÚwritec@s eZdZdS)rN)Ú__name__Ú __module__Ú __qualname__©r r ú/lib/python3.7/site-packages/scipy/io/wavfile.pyrsééiþÿcCsH|r d}nd}t |d| d¡¡d}}d}|dkr@tdƒ‚t |d| d¡¡}|d7}|\}}}} } } |tkr |d kr t |d | d ¡¡d} |d 7}| d kr| d ¡} |d 7}| d d …}|rÖd}nd}| |¡r t |d|dd…¡d}ntdƒ‚|tkrtdƒ‚||kr6| ||¡||||| | | fS)aÔ Returns ------- size : int size of format subchunk in bytes (minus 8 for "fmt " and itself) format_tag : int PCM, float, or compressed format channels : int number of channels fs : int sampling frequency in samples per second bytes_per_second : int overall byte rate for the file block_align : int bytes per sample, including all channels bit_depth : int bits per sample ú>ú<ÚIéréz.Binary structure of wave file is not compliantZHHIIHHéÚHééés €ª8›qs €ª8›qNzUnknown wave file format)ÚstructÚunpackrÚ ValueErrorÚWAVE_FORMAT_EXTENSIBLEÚendswithÚKNOWN_WAVE_FORMATS)ÚfidÚ is_big_endianÚfmtÚsizeZresZ bytes_readÚ format_tagÚchannelsÚfsÚbytes_per_secondÚ block_alignÚ bit_depthZext_chunk_sizeZextensible_chunk_dataZraw_guidÚtailr r r Ú_read_fmt_chunk's:       r*Fc CsÌ|r d}nd}t || d¡¡d}|d}|dkr:d} n0|rDd} nd} |tkr^| d |7} n | d |7} |s„tj| |¡| d } n0| ¡} tj|| d | ||fd } | | |¡|dkrÈ|   d|¡} | S)Nz>IzIzIz!File format {}... not understood.rr+sWAVEzNot a WAV file.)rrÚformatÚreprrr)rZstr1r r!Ú file_sizeZstr2r r r Ú_read_riff_chunks   r>c Csvt|dƒr|}d}n t|dƒ}z*t|ƒ\}}d}d}d}t}x| ¡|krF| d¡} | shtdƒ‚nt| ƒdkr|tdƒ‚| d krÄd }t||ƒ} | dd…\}}} | d }|d krÂtd   |¡ƒ‚qB| dkrØt ||ƒqB| dkr|sîtdƒ‚t ||||||ƒ} qB| dkrt ||ƒqB| dkr.t ||ƒqBt   dt¡t ||ƒqBWWdt|dƒsb| ¡n | d¡X| | fS)aÀ Open a WAV file Return the sample rate (in samples/sec) and data from a WAV file. Parameters ---------- filename : string or open file handle Input wav file. mmap : bool, optional Whether to read data as memory-mapped. Only to be used on real files (Default: False). .. versionadded:: 0.12.0 Returns ------- rate : int Sample rate of wav file. data : numpy array Data read from wav file. Data-type is determined from the file; see Notes. Notes ----- This function cannot read wav files with 24-bit data. Common data types: [1]_ ===================== =========== =========== ============= WAV format Min Max NumPy dtype ===================== =========== =========== ============= 32-bit floating-point -1.0 +1.0 float32 32-bit PCM -2147483648 +2147483647 int32 16-bit PCM -32768 +32767 int16 8-bit PCM 0 255 uint8 ===================== =========== =========== ============= Note that 8-bit PCM is unsigned. References ---------- .. [1] IBM Corporation and Microsoft Corporation, "Multimedia Programming Interface and Data Specifications 1.0", section "Data Format of the Samples", August 1991 http://www.tactilemedia.com/info/MCI_Control_Info.html rFÚrbr r+rzUnexpected end of file.zIncomplete wav chunk.sfmt Tr)r+ré é@é`é€z4Unsupported bit depth: the wav file has {}-bit data.sfactsdatazNo fmt chunk before datasLIST)sJUNKsFakez-Chunk (non-data) not understood, skipping it.Nr)ÚhasattrÚopenr>r2r4rrÚlenr*r;r:r9ÚwarningsÚwarnrÚcloser5) Úfilenamer6rr=r Zfmt_chunk_receivedr$r(r#Zchunk_idZ fmt_chunkr%r7r r r r´sT1                   c Cs2t|dƒr|}n t|dƒ}|}zê|jj}|dks\|dks\|dkrN|jjdks\td|jƒ‚d}|d 7}|d 7}|d 7}|d 7}|dkrŽt}nt}|jdkr¢d}n |j d}|jjd } || d |} || d } t   d|||| | | ¡} |dks|dks| d7} |t   dt | ƒ¡7}|| 7}|dksV|dksV|d7}|t   dd|j d¡7}t |ƒddd |j dkr~tdƒ‚| |¡| d¡| t   d|j ¡¡|jjdksÎ|jjdkrÖtjdkrÖ| ¡}t||ƒ| ¡} | d¡| t   d| d ¡¡Wdt|dƒs"| ¡n | d¡XdS)aY Write a numpy array as a WAV file. Parameters ---------- filename : string or open file handle Output wav file. rate : int The sample rate (in samples/sec). data : ndarray A 1-D or 2-D numpy array of either integer or float data-type. Notes ----- * Writes a simple uncompressed WAV file. * To write multiple-channels, use a 2-D array of shape (Nsamples, Nchannels). * The bits-per-sample and PCM/float will be determined by the data-type. Common data types: [1]_ ===================== =========== =========== ============= WAV format Min Max NumPy dtype ===================== =========== =========== ============= 32-bit floating-point -1.0 +1.0 float32 32-bit PCM -2147483648 +2147483647 int32 16-bit PCM -32768 +32767 int16 8-bit PCM 0 255 uint8 ===================== =========== =========== ============= Note that 8-bit PCM is unsigned. References ---------- .. [1] IBM Corporation and Microsoft Corporation, "Multimedia Programming Interface and Data Specifications 1.0", section "Data Format of the Samples", August 1991 http://www.tactilemedia.com/info/MCI_Control_Info.html rÚwbÚiÚfÚur zUnsupported data type '%s'ósRIFFssWAVEsfmt r+zrrÚ version_inforWr r r r Ú s,C # hs