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namedtuple _aifc_paramsz7nchannels sampwidth framerate nframes comptype compnamez3Number of audio channels (1 for mono, 2 for stereo)zSample width in byteszSampling frequencyzNumber of audio framesz(Compression type ("NONE" for AIFF files)zRA human-readable version of the compression type
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r,| j s4tdd S )Nr FORMz file does not start with FORM idr AIFF AIFCr znot an AIFF or AIFF-C file COMM SSND FVER MARKz$COMM chunk and/or SSND chunk missing)_version_convert_markers _soundpos_filerB Zgetnamer r _aifcZ_comm_chunk_read _ssnd_chunk_ssnd_seek_neededr _read_comm_chunkr _readmarkskip)selfr chunkZformdataZ chunknamer r r r initfp4 sH
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zAifc_read.__init__c C s | S Nr rY r r r __enter__h s zAifc_read.__enter__c G s | d S rc r` rY argsr r r __exit__k s zAifc_read.__exit__c C s | j S rc )rR rd r r r getfpq s zAifc_read.getfpc C s d| _ d| _d S )Nr r )rU rQ rd r r r rewindt s zAifc_read.rewindc C s | j }|d k r d | _ | d S rc )rR r` rY r r r r r` x s zAifc_read.closec C s | j S rc )rQ rd r r r tell~ s zAifc_read.tellc C s | j S rc )
_nchannelsrd r r r getnchannels s zAifc_read.getnchannelsc C s | j S rc )_nframesrd r r r
getnframes s zAifc_read.getnframesc C s | j S rc )
_sampwidthrd r r r getsampwidth s zAifc_read.getsampwidthc C s | j S rc )
_frameraterd r r r getframerate s zAifc_read.getframeratec C s | j S rc _comptyperd r r r getcomptype s zAifc_read.getcomptypec C s | j S rc _compnamerd r r r getcompname s zAifc_read.getcompnamec C s* t | | | | | | S rc )rD ro rs ru rq rx r{ rd r r r getparams s zAifc_read.getparamsc C s t | jdkrd S | jS Nr r: rP rd r r r
getmarkers s zAifc_read.getmarkersc C s2 | j D ]}||d kr| S qtd|d S Nr zmarker {0!r} does not existrP r formatrY idmarkerr r r getmark s
zAifc_read.getmarkc C s* |dk s|| j krtd|| _d| _d S )Nr zposition not in ranger )rp r rQ rU )rY posr r r setpos s zAifc_read.setposc C s | j rD| jd | jd}| j| j }|r>| j|d d| _ |dkrPdS | j|| j }| jrv|rv| |}| jt|| j| j | _|S )Nr rK r )
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zAifc_read.readframesc C s dd l }||dS Nr r )audioopZalaw2linrY r r r r r _alaw2lin s zAifc_read._alaw2linc C s dd l }||dS r )r Zulaw2linr r r r _ulaw2lin s zAifc_read._ulaw2linc C s2 dd l }t| dsd | _||d| j\}| _|S Nr _adpcmstater )r hasattrr Z adpcm2linr r r r
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zAifc_read._adpcm2linc C sV t || _t|| _t |d d | _tt|| _| jdkrFtd| jdkrXtd| j| j | _ | j
rFd}|j dkrd}t
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| j| _n4| jdkr | j| _n | jdkr6| j| _ntdd| _n d | _d| _d S )N rK r bad sample widthbad # of channels r z Warning: bad COMM chunk size r r" NONE G722 ulaw ULAW alaw ALAW unsupported compression typer not compressed)r rn r rp rr r@ r- rt r r rS Z chunksizewarningswarnr rw r r r r! rz r rO r r )rY rZ Zkludger r r r rV sD
zAifc_read._read_comm_chunkc C s t |}zDt|D ]6}t |}t|}t|}|s6|r| j|||f qW nD tk
r dt| jt| jdkrxdnd|f }t | Y nX d S )Nz;Warning: MARK chunk contains only %s marker%s instead of %sr r< )
r ranger r! rP appendr r: r r )rY rZ Znmarkersir r namewr r r rW s zAifc_read._readmark) r r r rR r[ rb re ri rj rk r` rm ro rq rs ru rx r{ r| r r r r r r r rV rW r r r r rE s2 $( *rE c @ s0 e Zd ZdZdd Zdd Zdd Zdd Zd
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Aifc_writeNc C s\ t |trNt|d}z| | W n | Y nX |drXd| _n
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zAifc_write.__init__c C s^ || _ t| _d| _d| _d | _d| _d| _d| _d| _ d| _
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d| _d| _d S )Nr r r r )rR
_AIFC_versionrN rw rz rO rn rr rt rp _nframeswritten _datawritten _datalengthrP _marklengthrS rl r r r r[ ? s zAifc_write.initfpc C s | d S rc rf rd r r r __del__P s zAifc_write.__del__c C s | S rc r rd r r r re S s zAifc_write.__enter__c G s | d S rc rf rg r r r ri V s zAifc_write.__exit__c C s | j rtdd| _d S )N0cannot change parameters after starting to writer r r rS rd r r r aiff\ s zAifc_write.aiffc C s | j rtdd| _d S )Nr r r rd r r r aifca s zAifc_write.aifcc C s( | j rtd|dk r td|| _d S )Nr r r )r r rn )rY nchannelsr r r setnchannelsf s
zAifc_write.setnchannelsc C s | j std| j S )Nznumber of channels not set)rn r rd r r r ro m s zAifc_write.getnchannelsc C s0 | j rtd|dk s |dkr&td|| _d S )Nr r r r )r r rr )rY sampwidthr r r setsampwidthr s
zAifc_write.setsampwidthc C s | j std| j S )Nzsample width not set)rr r rd r r r rs y s zAifc_write.getsampwidthc C s( | j rtd|dkr td|| _d S )Nr r zbad frame rate)r r rt )rY framerater r r setframerate~ s
zAifc_write.setframeratec C s | j std| j S )Nzframe rate not set)rt r rd r r r ru s zAifc_write.getframeratec C s | j rtd|| _d S )Nr )r r rp )rY r r r r
setnframes s zAifc_write.setnframesc C s | j S rc r rd r r r rq s zAifc_write.getnframesc C s. | j rtd|dkr td|| _|| _d S Nr )r r r r r r r )r r rw rz )rY comptypecompnamer r r setcomptype s zAifc_write.setcomptypec C s | j S rc rv rd r r r rx s zAifc_write.getcomptypec C s | j S rc ry rd r r r r{ s zAifc_write.getcompnamec C sf |\}}}}}}| j r td|dkr.td| | | | | | | | | || d S r )r r r r r r r )rY Zparamsr r r r r r r r r setparams s
zAifc_write.setparamsc C s8 | j r| jr| jstdt| j | j| j| j| j| jS )Nznot all parameters set)rn rr rt r rD rp rw rz rd r r r r| s zAifc_write.getparamsc C s |dkrt d|dk r t dt|ts2t dtt| jD ],}|| j| d kr@|||f| j|< d S q@| j|||f d S )Nr zmarker ID must be > 0z marker position must be >= 0zmarker name must be bytes)r r] bytesr r: rP r )rY r r r r r r r setmark s
zAifc_write.setmarkc C s2 | j D ]}||d kr| S qtd|d S r r r r r r r s
zAifc_write.getmarkc C s t | jdkrd S | jS r} r~ rd r r r r s zAifc_write.getmarkersc C s | j S rc r rd r r r rm s zAifc_write.tellc C sz t |ttfs t|d}| t| t|| j| j }| j rN| |}| j
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zAifc_write.writeframesrawc C s. | | | j| jks"| j| jkr*| d S rc )r r rp r r _patchheader)rY r r r r writeframes s
zAifc_write.writeframesc C s | j d krd S z^| d | jd@ r<| j d | jd | _| | j| jksb| j | jksb| j
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zAifc_write._lin2adpcmc C sf | j sb| jdkr.| js d| _| jdkr.td| js | j dkr| j| _n&| j dkr(| j| _n| j dkr:| j| _d S )Nr r r )rw r rO r r rd r r r _init_compression s
z Aifc_write._init_compressionc C sJ | j r| jdkr| | jd | js<|| j| j | _| j| j | j | _| jd@ rf| jd | _| j r| jdkr| jd | _| jd@ r| jd | _n0| jdkr| jd d | _| jd@ r| jd | _z| j | _
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d k r | j | _t| j| jd t| jd t| jd d S )Nr rF r )r r r r r r r rH rL rG rI r rK rJ r )rS rw r rR r/ rp rn rr r rm _form_length_posAttributeErrorOSError_write_form_lengthr6 rN r3 _nframes_posrA rt r= rz _ssnd_length_pos)rY Z
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zAifc_write._write_headerc C s\ | j r*dt| j }|d@ r$|d }d}nd}d}t| jd| | j d | d | |S ) Nr r r r r rK )rS r: rz r6 rR r )rY
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d t | j |d | j |d | j| _|| _d S )Nr r9 r rK )rR rm r r/ r rp r r r r r r r6 r )rY Zcurposr r r r r r e s*
zAifc_write._patchheaderc C s t | jdkrd S | jd d}| jD ]:}|\}}}|t | d d }t |d@ dkr(|d }q(t| j| |d | _t| jt | j | jD ]2}|\}}}t| j| t| j| t| j| qd S )Nr rM r r rK )r: rP rR r/ r6 r r3 r= )rY r r r r r r r r r { s"
zAifc_write._writemarkers)(r r r rR rb r[ r re ri r r r ro r rs r ru r rq r rx r{ r r| r r r rm r r r` r r r r r r r r r r r r r r sJ
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r c C sJ |d kr t | dr| j}nd}|dkr.t| S |dkr>t| S tdd S )Nmoder\ )rr\ )r r z$mode must be 'r', 'rb', 'w', or 'wb')r r rE r r r( r r r r r s
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__main__r z /usr/demos/data/audio/bach.aiffr ZReadingz nchannels =z nframes =z sampwidth =z framerate =z comptype =z compname =r ZWritingr i zDone.)N)N)8r
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