Exemple #1
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def lin2lin(cp, size, size2):
    _check_params(len(cp), size)
    _check_size(size2)

    if size == size2:
        return cp

    new_len = (len(cp) // size) * size2
    rv = ffi.new("unsigned char[]", new_len)
    result = ffi.buffer(rv)

    for i in range(_sample_count(cp, size)):
        sample = _get_sample(cp, size, i)
        if size == 1:
            sample <<= 24
        elif size == 2:
            sample <<= 16
        if size2 == 1:
            sample >>= 24
        elif size2 == 2:
            sample >>= 16
        sample = _overflow(sample, size2)
        _put_sample(result, size2, i, sample)

    return result[:]
Exemple #2
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def lin2lin(cp, size, size2):
    _check_params(len(cp), size)
    _check_size(size2)

    if size == size2:
        return cp

    new_len = (len(cp) // size) * size2
    rv = ffi.new("unsigned char[]", new_len)
    result = ffi.buffer(rv)

    for i in range(_sample_count(cp, size)):
        sample = _get_sample(cp, size, i)
        if size == 1:
            sample <<= 24
        elif size == 2:
            sample <<= 16
        if size2 == 1:
            sample >>= 24
        elif size2 == 2:
            sample >>= 16
        sample = _overflow(sample, size2)
        _put_sample(result, size2, i, sample)

    return result[:]
Exemple #3
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def lin2adpcm(cp, size, state):
    _check_params(len(cp), size)
    state = _check_state(state)
    rv = ffi.new("unsigned char[]", len(cp) // size // 2)
    state_ptr = ffi.new("int[]", state)
    lib.lin2adcpm(rv, cp, len(cp), size, state_ptr)
    return ffi.buffer(rv)[:], tuple(state_ptr)
Exemple #4
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def adpcm2lin(cp, size, state):
    _check_size(size)
    state = _check_state(state)
    rv = ffi.new("unsigned char[]", len(cp) * size * 2)
    state_ptr = ffi.new("int[]", state)
    lib.adcpm2lin(rv, cp, len(cp), size, state_ptr)
    return ffi.buffer(rv)[:], tuple(state_ptr)
Exemple #5
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def lin2adpcm(cp, size, state):
    _check_params(len(cp), size)
    state = _check_state(state)
    rv = ffi.new("unsigned char[]", len(cp) // size // 2)
    state_ptr = ffi.new("int[]", state)
    lib.lin2adcpm(rv, cp, len(cp), size, state_ptr)
    return ffi.buffer(rv)[:], tuple(state_ptr)
Exemple #6
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def adpcm2lin(cp, size, state):
    _check_size(size)
    state = _check_state(state)
    rv = ffi.new("unsigned char[]", len(cp) * size * 2)
    state_ptr = ffi.new("int[]", state)
    lib.adcpm2lin(rv, cp, len(cp), size, state_ptr)
    return ffi.buffer(rv)[:], tuple(state_ptr)
Exemple #7
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def alaw2lin(cp, size):
    _check_size(size)
    rv = ffi.new("unsigned char[]", len(cp) * size)
    result = ffi.buffer(rv)
    for i, value in enumerate(cp):
        sample = lib.st_alaw2linear16(ord(value))
        _put_lin_sample(result, size, i, sample)
    return result[:]
Exemple #8
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def tostereo(cp, size, fac1, fac2):
    _check_params(len(cp), size)

    sample_count = _sample_count(cp, size)

    rv = ffi.new("char[]", len(cp) * 2)
    lib.tostereo(rv, cp, len(cp), size, fac1, fac2)
    return ffi.buffer(rv)[:]
Exemple #9
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def tostereo(cp, size, fac1, fac2):
    _check_params(len(cp), size)

    sample_count = _sample_count(cp, size)

    rv = ffi.new("unsigned char[]", len(cp) * 2)
    lib.tostereo(rv, cp, len(cp), size, fac1, fac2)
    return ffi.buffer(rv)[:]
Exemple #10
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def alaw2lin(cp, size):
    _check_size(size)
    rv = ffi.new("unsigned char[]", len(cp) * size)
    result = ffi.buffer(rv)
    for i, value in enumerate(cp):
        sample = lib.st_alaw2linear16(ord(value))
        _put_lin_sample(result, size, i, sample)
    return result[:]
Exemple #11
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def add(cp1, cp2, size):
    _check_params(len(cp1), size)

    if len(cp1) != len(cp2):
        raise error("Lengths should be the same")

    rv = ffi.new("char[]", len(cp1))
    lib.add(rv, cp1, cp2, len(cp1), size)
    return ffi.buffer(rv)[:]
Exemple #12
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def add(cp1, cp2, size):
    _check_params(len(cp1), size)

    if len(cp1) != len(cp2):
        raise error("Lengths should be the same")

    rv = ffi.new("unsigned char[]", len(cp1))
    lib.add(rv, cp1, cp2, len(cp1), size)
    return ffi.buffer(rv)[:]
Exemple #13
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def ratecv(cp, size, nchannels, inrate, outrate, state, weightA=1, weightB=0):
    _check_params(len(cp), size)
    if nchannels < 1:
        raise error("# of channels should be >= 1")

    bytes_per_frame = size * nchannels
    frame_count = len(cp) // bytes_per_frame

    if bytes_per_frame // nchannels != size:
        raise OverflowError("width * nchannels too big for a C int")

    if weightA < 1 or weightB < 0:
        raise error("weightA should be >= 1, weightB should be >= 0")

    if len(cp) % bytes_per_frame != 0:
        raise error("not a whole number of frames")

    if inrate <= 0 or outrate <= 0:
        raise error("sampling rate not > 0")

    d = gcd(inrate, outrate)
    inrate //= d
    outrate //= d
    d = gcd(weightA, weightB)
    weightA //= d
    weightB //= d

    if state is None:
        d = -outrate
        prev_i = ffi.new('int[]', nchannels)
        cur_i = ffi.new('int[]', nchannels)
    else:
        d, samps = state

        if len(samps) != nchannels:
            raise error("illegal state argument")

        prev_i, cur_i = zip(*samps)
        prev_i = ffi.new('int[]', prev_i)
        cur_i = ffi.new('int[]', cur_i)
    state_d = ffi.new('int[]', (d,))

    q = frame_count // inrate
    ceiling = (q + 1) * outrate
    nbytes = ceiling * bytes_per_frame

    rv = ffi.new("char[]", nbytes)
    cpbuf = ffi.from_buffer(cp)
    trim_index = lib.ratecv(rv, cpbuf, frame_count, size,
                            nchannels, inrate, outrate,
                            state_d, prev_i, cur_i,
                            weightA, weightB)
    result = ffi.buffer(rv)[:trim_index]
    d = state_d[0]
    samps = zip(prev_i, cur_i)
    return (result, (d, tuple(samps)))
Exemple #14
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def reverse(cp, size):
    _check_params(len(cp), size)
    sample_count = _sample_count(cp, size)

    rv = ffi.new("unsigned char[]", len(cp))
    result = ffi.buffer(rv)
    for i, sample in enumerate(_get_samples(cp, size)):
        _put_sample(result, size, sample_count - i - 1, sample)

    return result[:]
Exemple #15
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def reverse(cp, size):
    _check_params(len(cp), size)
    sample_count = _sample_count(cp, size)

    rv = ffi.new("unsigned char[]", len(cp))
    result = ffi.buffer(rv)
    for i, sample in enumerate(_get_samples(cp, size)):
        _put_sample(result, size, sample_count - i - 1, sample)

    return result[:]
Exemple #16
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def ratecv(cp, size, nchannels, inrate, outrate, state, weightA=1, weightB=0):
    _check_params(len(cp), size)
    if nchannels < 1:
        raise error("# of channels should be >= 1")

    bytes_per_frame = size * nchannels
    frame_count = len(cp) // bytes_per_frame

    if bytes_per_frame // nchannels != size:
        raise OverflowError("width * nchannels too big for a C int")

    if weightA < 1 or weightB < 0:
        raise error("weightA should be >= 1, weightB should be >= 0")

    if len(cp) % bytes_per_frame != 0:
        raise error("not a whole number of frames")

    if inrate <= 0 or outrate <= 0:
        raise error("sampling rate not > 0")

    d = gcd(inrate, outrate)
    inrate //= d
    outrate //= d
    d = gcd(weightA, weightB)
    weightA //= d
    weightB //= d

    if state is None:
        d = -outrate
        prev_i = ffi.new('int[]', nchannels)
        cur_i = ffi.new('int[]', nchannels)
    else:
        d, samps = state

        if len(samps) != nchannels:
            raise error("illegal state argument")

        prev_i, cur_i = zip(*samps)
        prev_i = ffi.new('int[]', prev_i)
        cur_i = ffi.new('int[]', cur_i)
    state_d = ffi.new('int[]', (d,))

    q = frame_count // inrate
    ceiling = (q + 1) * outrate
    nbytes = ceiling * bytes_per_frame

    rv = ffi.new("unsigned char[]", nbytes)
    trim_index = lib.ratecv(rv, cp, frame_count, size,
                            nchannels, inrate, outrate,
                            state_d, prev_i, cur_i,
                            weightA, weightB)
    result = ffi.buffer(rv)[:trim_index]
    d = state_d[0]
    samps = zip(prev_i, cur_i)
    return (result, (d, tuple(samps)))
Exemple #17
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def bias(cp, size, bias):
    _check_params(len(cp), size)

    rv = ffi.new("unsigned char[]", len(cp))
    result = ffi.buffer(rv)

    for i, sample in enumerate(_get_samples(cp, size)):
        sample = _overflow(sample + bias, size)
        _put_sample(result, size, i, sample)

    return result[:]
Exemple #18
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def bias(cp, size, bias):
    _check_params(len(cp), size)

    rv = ffi.new("unsigned char[]", len(cp))
    result = ffi.buffer(rv)

    for i, sample in enumerate(_get_samples(cp, size)):
        sample = _overflow(sample + bias, size)
        _put_sample(result, size, i, sample)

    return result[:]
Exemple #19
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def mul(cp, size, factor):
    _check_params(len(cp), size)
    clip = _get_clipfn(size)

    rv = ffi.new("unsigned char[]", len(cp))
    result = ffi.buffer(rv)

    for i, sample in enumerate(_get_samples(cp, size)):
        sample = clip(int(sample * factor))
        _put_sample(result, size, i, sample)

    return result[:]
Exemple #20
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def mul(cp, size, factor):
    _check_params(len(cp), size)
    clip = _get_clipfn(size)

    rv = ffi.new("unsigned char[]", len(cp))
    result = ffi.buffer(rv)

    for i, sample in enumerate(_get_samples(cp, size)):
        sample = clip(int(sample * factor))
        _put_sample(result, size, i, sample)

    return result[:]
Exemple #21
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def byteswap(cp, size):
    if len(cp) % size != 0:
        raise error("not a whole number of frames")
    sample_count = _sample_count(cp, size)
    rv = ffi.new("unsigned char[]", len(cp))
    base = size
    next_bump = 0
    bump = 2 * size
    for i in range(len(cp)):
        base -= 1
        rv[i] = cp[base]
        if base == next_bump:
            base += bump
            next_bump += size
    return ffi.buffer(rv)[:]
Exemple #22
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def tomono(cp, size, fac1, fac2):
    _check_params(len(cp), size)
    clip = _get_clipfn(size)

    sample_count = _sample_count(cp, size)

    rv = ffi.new("unsigned char[]", len(cp) // 2)
    result = ffi.buffer(rv)

    for i in range(0, sample_count, 2):
        l_sample = getsample(cp, size, i)
        r_sample = getsample(cp, size, i + 1)

        sample = (l_sample * fac1) + (r_sample * fac2)
        sample = int(clip(sample))

        _put_sample(result, size, i // 2, sample)

    return result[:]
Exemple #23
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def tomono(cp, size, fac1, fac2):
    _check_params(len(cp), size)
    clip = _get_clipfn(size)

    sample_count = _sample_count(cp, size)

    rv = ffi.new("unsigned char[]", len(cp) // 2)
    result = ffi.buffer(rv)

    for i in range(0, sample_count, 2):
        l_sample = getsample(cp, size, i)
        r_sample = getsample(cp, size, i + 1)

        sample = (l_sample * fac1) + (r_sample * fac2)
        sample = int(clip(sample))

        _put_sample(result, size, i // 2, sample)

    return result[:]
Exemple #24
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def lin2alaw(cp, size):
    _check_params(len(cp), size)
    rv = ffi.new("unsigned char[]", _sample_count(cp, size))
    for i, sample in enumerate(_get_lin_samples(cp, size)):
        rv[i] = lib.st_linear2alaw(sample)
    return ffi.buffer(rv)[:]
Exemple #25
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def lin2alaw(cp, size):
    _check_params(len(cp), size)
    rv = ffi.new("unsigned char[]", _sample_count(cp, size))
    for i, sample in enumerate(_get_lin_samples(cp, size)):
        rv[i] = lib.st_linear2alaw(sample)
    return ffi.buffer(rv)[:]