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librosa.core.blocks_to_time¶

librosa.core.blocks_to_time(blocks, block_length, hop_length, sr)[source]¶

Convert block indices to time (in seconds)

Parameters

blocksnp.ndarray: Block index or array of block indices
block_lengthint > 0: The number of frames per block
hop_lengthint > 0: The number of samples to advance between frames
srint > 0: The sampling rate (samples per second)

Returns

timesnp.ndarray [shape=samples.shape]

The time index or indices (in seconds) corresponding to the beginning of each provided block.

Note that these correspond to the time of the first sample in each block, and are not frame-centered.

See also

blocks_to_frames
blocks_to_samples

Examples

Get time indices for each block in a stream

>>> filename = librosa.util.example_audio_file()
>>> sr = librosa.get_samplerate(filename)
>>> stream = librosa.stream(filename, block_length=16, 
...                         frame_length=2048, hop_length=512)
>>> for n, y in enumerate(stream):
...     n_time = librosa.blocks_to_time(n, block_length=16,
...                                     hop_length=512, sr=sr)