3
\¯F ã @ s° d Z ddlmZ eddƒZdZdZdZdZd Zd
Z d Z
d Z d
Z dZ
dZdZdZdZeeeee egZG dd„ deƒZdd„ Zdd„ ZG dd„ dƒZG dd „ d ƒZd d d „ZeZd S )!aÚ Stuff to parse Sun and NeXT audio files.
An audio file consists of a header followed by the data. The structure
of the header is as follows.
+---------------+
| magic word |
+---------------+
| header size |
+---------------+
| data size |
+---------------+
| encoding |
+---------------+
| sample rate |
+---------------+
| # of channels |
+---------------+
| info |
| |
+---------------+
The magic word consists of the 4 characters '.snd'. Apart from the
info field, all header fields are 4 bytes in size. They are all
32-bit unsigned integers encoded in big-endian byte order.
The header size really gives the start of the data.
The data size is the physical size of the data. From the other
parameters the number of frames can be calculated.
The encoding gives the way in which audio samples are encoded.
Possible values are listed below.
The info field currently consists of an ASCII string giving a
human-readable description of the audio file. The info field is
padded with NUL bytes to the header size.
Usage.
Reading audio files:
f = sunau.open(file, 'r')
where file is either the name of a file or an open file pointer.
The open file pointer must have methods read(), seek(), and close().
When the setpos() and rewind() methods are not used, the seek()
method is not necessary.
This returns an instance of a class with the following public methods:
getnchannels() -- returns number of audio channels (1 for
mono, 2 for stereo)
getsampwidth() -- returns sample width in bytes
getframerate() -- returns sampling frequency
getnframes() -- returns number of audio frames
getcomptype() -- returns compression type ('NONE' or 'ULAW')
getcompname() -- returns human-readable version of
compression type ('not compressed' matches 'NONE')
getparams() -- returns a namedtuple consisting of all of the
above in the above order
getmarkers() -- returns None (for compatibility with the
aifc module)
getmark(id) -- raises an error since the mark does not
exist (for compatibility with the aifc module)
readframes(n) -- returns at most n frames of audio
rewind() -- rewind to the beginning of the audio stream
setpos(pos) -- seek to the specified position
tell() -- return the current position
close() -- close the instance (make it unusable)
The position returned by tell() and the position given to setpos()
are compatible and have nothing to do with the actual position in the
file.
The close() method is called automatically when the class instance
is destroyed.
Writing audio files:
f = sunau.open(file, 'w')
where file is either the name of a file or an open file pointer.
The open file pointer must have methods write(), tell(), seek(), and
close().
This returns an instance of a class with the following public methods:
setnchannels(n) -- set the number of channels
setsampwidth(n) -- set the sample width
setframerate(n) -- set the frame rate
setnframes(n) -- set the number of frames
setcomptype(type, name)
-- set the compression type and the
human-readable compression type
setparams(tuple)-- set all parameters at once
tell() -- return current position in output file
writeframesraw(data)
-- write audio frames without pathing up the
file header
writeframes(data)
-- write audio frames and patch up the file header
close() -- patch up the file header and close the
output file
You should set the parameters before the first writeframesraw or
writeframes. The total number of frames does not need to be set,
but when it is set to the correct value, the header does not have to
be patched up.
It is best to first set all parameters, perhaps possibly the
compression type, and then write audio frames using writeframesraw.
When all frames have been written, either call writeframes(b'') or
close() to patch up the sizes in the header.
The close() method is called automatically when the class instance
is destroyed.
é )Ú
namedtupleÚ
_sunau_paramsz7nchannels sampwidth framerate nframes comptype compnameidns.é é é é é é é é é é é é l ÿÿ c @ s e Zd ZdS )ÚErrorN)Ú__name__Ú
__module__Ú __qualname__© r r ú /usr/lib64/python3.6/sunau.pyr ˆ s r c C s< d}x2t dƒD ]&}| jdƒ}|s$t‚|d t|ƒ }qW |S )Nr r r é )ÚrangeÚreadÚEOFErrorÚord)ÚfileÚxÚiZbyter r r Ú _read_u32‹ s
r c C sJ g }x2t dƒD ]&}t|dƒ\}}|jdt|ƒƒ |}qW | jt|ƒƒ d S )Nr r r )r ÚdivmodÚinsertÚintÚwriteÚbytes)r r Údatar ÚdÚmr r r Ú
_write_u32” s r' c @ s¬ e Zd Zdd„ Zdd„ Zdd„ Zdd„ Zd d
„ Zd d „ Zd
d„ Z dd„ Z
dd„ Z dd„ Z dd„ Z
dd„ Zdd„ Zdd „ Zd d „ Zd d „ Zd!d"„ Zd#d$„ Zd%d&„ Zd'd(„ Zd)S )*ÚAu_readc C s@ t |ƒt dƒkr,dd l}|j|dƒ}d| _nd| _| j|ƒ d S )NÚ r ÚrbTF)ÚtypeÚbuiltinsÚopenÚ_openedÚinitfp)ÚselfÚfr, r r r Ú__init__ž s zAu_read.__init__c C s | j r| jƒ d S )N)Ú_fileÚclose)r0 r r r Ú__del__§ s zAu_read.__del__c C s | S )Nr )r0 r r r Ú __enter__« s zAu_read.__enter__c G s | j ƒ d S )N)r4 )r0 Úargsr r r Ú__exit__® s zAu_read.__exit__c C s¸ || _ d| _tt|ƒƒ}|tkr(tdƒ‚tt|ƒƒ| _| jdk rHtdƒ‚| jdkrZtdƒ‚t|ƒ| _| jtkrzt| jƒ| _tt|ƒƒ| _ | j t
krštdƒ‚| j t t fkr¶d| _
d | _nj| j tkrÎd | _| _
nR| j tkræd | _| _
n:| j tkrþd
| _| _
n"| j tkrd | _| _
ntd ƒ‚tt|ƒƒ| _tt|ƒƒ| _| j| j | _| jdkr~|j| jd ƒ| _| jjd
ƒ\| _}}nd| _y|jƒ | _W n ttfk
r² d | _Y nX d S )Nr zbad magic numberr zheader size too smalléd z header size ridiculously largez encoding not (yet) supportedr r r r zunknown encodingó ó ) r3 Ú _soundposr! r ÚAUDIO_FILE_MAGICr Z _hdr_sizeÚ
_data_sizeÚAUDIO_UNKNOWN_SIZEÚ _encodingÚ_simple_encodingsÚAUDIO_FILE_ENCODING_MULAW_8ÚAUDIO_FILE_ENCODING_ALAW_8Ú
_sampwidthÚ
_framesizeÚ AUDIO_FILE_ENCODING_LINEAR_8Ú AUDIO_FILE_ENCODING_LINEAR_16Ú AUDIO_FILE_ENCODING_LINEAR_24Ú AUDIO_FILE_ENCODING_LINEAR_32Ú
_framerateÚ
_nchannelsr Ú_infoÚ partitionÚtellÚ _data_posÚAttributeErrorÚOSError)r0 r ÚmagicÚ_r r r r/ ± sP
zAu_read.initfpc C s | j S )N)r3 )r0 r r r ÚgetfpÝ s z
Au_read.getfpc C s | j S )N)rK )r0 r r r Ú getnchannelsà s zAu_read.getnchannelsc C s | j S )N)rD )r0 r r r Ú getsampwidthã s zAu_read.getsampwidthc C s | j S )N)rJ )r0 r r r Ú getframerateæ s zAu_read.getframeratec C s( | j tkrtS | jtkr$| j | j S dS )Nr )r> r? r@ rA rE )r0 r r r Ú
getnframesé s
zAu_read.getnframesc C s$ | j tkrdS | j tkr dS dS d S )NÚULAWÚALAWÚNONE)r@ rB rC )r0 r r r Ú getcomptypeð s
zAu_read.getcomptypec C s$ | j tkrdS | j tkr dS dS d S )NzCCITT G.711 u-lawzCCITT G.711 A-lawznot compressed)r@ rB rC )r0 r r r Ú getcompnameø s
zAu_read.getcompnamec C s* t | jƒ | jƒ | jƒ | jƒ | jƒ | jƒ ƒS )N)r rU rV rW rX r\ r] )r0 r r r Ú getparams s zAu_read.getparamsc C s d S )Nr )r0 r r r Ú
getmarkers s zAu_read.getmarkersc C s t dƒ‚d S )Nzno marks)r )r0 Úidr r r Úgetmark s zAu_read.getmarkc C sp | j tkrl|tkr | jjƒ }n| jj|| j ƒ}| jt|ƒ| j 7 _| j tkrhdd l }|j
|| j ƒ}|S d S )Nr ) r@ rA r? r3 r rE r< ÚlenrB ÚaudioopZulaw2linrD )r0 Únframesr$ rc r r r Ú
readframes s
zAu_read.readframesc C s* | j d krtdƒ‚| jj| j ƒ d| _d S )Nz cannot seekr )rO rQ r3 Úseekr< )r0 r r r Úrewind s
zAu_read.rewindc C s | j S )N)r< )r0 r r r rN s z Au_read.tellc C sP |dk s|| j ƒ kr tdƒ‚| jd kr.tdƒ‚| jj| j|| j ƒ || _d S )Nr zposition not in rangez cannot seek)rX r rO rQ r3 rf rE r< )r0 Úposr r r Úsetpos! s
zAu_read.setposc C s" | j }|r d | _ | jr |jƒ d S )N)r3 r. r4 )r0 r r r r r4 ) s
z
Au_read.closeN)r r r r2 r5 r6 r8 r/ rT rU rV rW rX r\ r] r^ r_ ra re rg rN ri r4 r r r r r( œ s( ,
r( c @ sÔ e Zd Zdd„ Zdd„ Zdd„ Zdd„ Zd d
„ Zd d „ Zd
d„ Z dd„ Z
dd„ Z dd„ Z dd„ Z
dd„ Zdd„ Zdd „ Zd d „ Zd d „ Zd!d"„ Zd#d$„ Zd%d&„ Zd'd(„ Zd)d*„ Zd+d,„ Zd-d.„ Zd/d0„ Zd1d2„ Zd3S )4ÚAu_writec C s@ t |ƒt dƒkr,dd l}|j|dƒ}d| _nd| _| j|ƒ d S )Nr) r ÚwbTF)r+ r, r- r. r/ )r0 r1 r, r r r r2 2 s zAu_write.__init__c C s | j r| jƒ d | _ d S )N)r3 r4 )r0 r r r r5 ; s zAu_write.__del__c C s | S )Nr )r0 r r r r6 @ s zAu_write.__enter__c G s | j ƒ d S )N)r4 )r0 r7 r r r r8 C s zAu_write.__exit__c C sF || _ d| _d| _d| _d| _t| _d| _d| _d| _ d| _
d| _ d S )Nr r; rY ) r3 rJ rK rD rE r? Ú_nframesÚ_nframeswrittenÚ _datawrittenÚ _datalengthrL Ú _comptype)r0 r r r r r/ F s zAu_write.initfpc C s( | j rtdƒ‚|dkr tdƒ‚|| _d S )Nz0cannot change parameters after starting to writer r r z"only 1, 2, or 4 channels supported)r r r )rm r rK )r0 Ú nchannelsr r r Ú setnchannelsS s
zAu_write.setnchannelsc C s | j stdƒ‚| j S )Nznumber of channels not set)rK r )r0 r r r rU Z s zAu_write.getnchannelsc C s( | j rtdƒ‚|dkr tdƒ‚|| _d S )Nz0cannot change parameters after starting to writer r r r zbad sample width)r r r r )rm r rD )r0 Ú sampwidthr r r Ú setsampwidth_ s
zAu_write.setsampwidthc C s | j stdƒ‚| jS )Nzsample width not specified)rJ r rD )r0 r r r rV f s zAu_write.getsampwidthc C s | j rtdƒ‚|| _d S )Nz0cannot change parameters after starting to write)rm r rJ )r0 Ú framerater r r Ú setframeratek s zAu_write.setframeratec C s | j stdƒ‚| j S )Nzframe rate not set)rJ r )r0 r r r rW p s zAu_write.getframeratec C s( | j rtdƒ‚|dk r tdƒ‚|| _d S )Nz0cannot change parameters after starting to writer z # of frames cannot be negative)rm r rl )r0 rd r r r Ú
setnframesu s
zAu_write.setnframesc C s | j S )N)rm )r0 r r r rX | s zAu_write.getnframesc C s |dkr|| _ ntdƒ‚d S )Nr[ rY zunknown compression type)r[ rY )rp r )r0 r+ Únamer r r Ú setcomptype s zAu_write.setcomptypec C s | j S )N)rp )r0 r r r r\ … s zAu_write.getcomptypec C s$ | j dkrdS | j dkr dS dS d S )NrY zCCITT G.711 u-lawrZ zCCITT G.711 A-lawznot compressed)rp )r0 r r r r] ˆ s
zAu_write.getcompnamec C sH |\}}}}}}| j |ƒ | j|ƒ | j|ƒ | j|ƒ | j||ƒ d S )N)rr rt rv rw ry )r0 Zparamsrq rs ru rd ZcomptypeZcompnamer r r Ú setparams s
zAu_write.setparamsc C s* t | jƒ | jƒ | jƒ | jƒ | jƒ | jƒ ƒS )N)r rU rV rW rX r\ r] )r0 r r r r^ ˜ s zAu_write.getparamsc C s | j S )N)rm )r0 r r r rN s z
Au_write.tellc C s~ t |ttfƒs t|ƒjdƒ}| jƒ | jdkrDdd l}|j|| j ƒ}t
|ƒ| j }| j j
|ƒ | j| | _| jt
|ƒ | _d S )NÚBrY r )Ú
isinstancer# Ú bytearrayÚ
memoryviewÚcastÚ_ensure_header_writtenrp rc Zlin2ulawrD rb rE r3 r" rm rn )r0 r$ rc rd r r r Úwriteframesraw s
zAu_write.writeframesrawc C s. | j |ƒ | j| jks"| j| jkr*| jƒ d S )N)r rm rl ro rn Ú _patchheader)r0 r$ r r r Ú writeframes¬ s
zAu_write.writeframesc C s^ | j rZz6| jƒ | j| jks(| j| jkr0| jƒ | j jƒ W d | j }d | _ | jrX|j ƒ X d S )N)
r3 r€ rm rl ro rn r‚ Úflushr. r4 )r0 r r r r r4 ² s zAu_write.closec C s< | j s8| jstdƒ‚| js"tdƒ‚| js0tdƒ‚| jƒ d S )Nz# of channels not specifiedzsample width not specifiedzframe rate not specified)rm rK r rD rJ Ú
_write_header)r0 r r r r€ Ä s z Au_write._ensure_header_writtenc
C s‚ | j dkrl| jdkr t}d| _qŠ| jdkr6t}d| _qŠ| jdkrLt}d| _qŠ| jdkrbt}d| _qŠtdƒ‚n | j dkr‚t}d| _ntdƒ‚| j| j | _t
| j t ƒ dt
| jƒ }|d d @ }t
| j |ƒ | jtkrÚt}n | j| j }y| j jƒ | _W n ttfk
r d | _Y nX t
| j |ƒ || _t
| j |ƒ t
| j | jƒ t
| j | j ƒ | j j| jƒ | j jd
|t
| jƒ d ƒ d S )
Nr[ r r r r zinternal errorrY r
r
r: r iøÿÿÿ)rp rD rF rE rG rH rI r rB rK r' r3 r= rb rL rl r? rN Ú_form_length_posrP rQ ro rJ r" )r0 ÚencodingZ header_sizeZlengthr r r r… Î sJ
zAu_write._write_headerc C sH | j d krtdƒ‚| jj| j ƒ t| j| jƒ | j| _| jjddƒ d S )Nz cannot seekr r )r† rQ r3 rf r' rn ro )r0 r r r r‚ ø s
zAu_write._patchheaderN) r r r r2 r5 r6 r8 r/ rr rU rt rV rv rW rw rX ry r\ r] rz r^ rN r rƒ r4 r€ r… r‚ r r r r rj 0 s2
*rj Nc C sJ |d kr t | dƒr| j}nd}|dkr.t| ƒS |dkr>t| ƒS tdƒ‚d S ) NÚmoder* ÚrÚwrk z$mode must be 'r', 'rb', 'w', or 'wb')r‰ r* )rŠ rk )Úhasattrrˆ r( rj r )r1 rˆ r r r r- s
r- )N)Ú__doc__Ú collectionsr r r= rB rF rG rH rI ZAUDIO_FILE_ENCODING_FLOATZAUDIO_FILE_ENCODING_DOUBLEZ AUDIO_FILE_ENCODING_ADPCM_G721Z AUDIO_FILE_ENCODING_ADPCM_G722Z AUDIO_FILE_ENCODING_ADPCM_G723_3Z AUDIO_FILE_ENCODING_ADPCM_G723_5rC r? rA Ú Exceptionr r r' r( rj r- Zopenfpr r r r Ú