librosa.blocks_to_frames¶

librosa.blocks_to_frames(blocks, *, block_length)[source]¶

Convert block indices to frame indices

Parameters

blocksnp.ndarray: Block index or array of block indices
block_lengthint > 0: The number of frames per block

Returns

framesnp.ndarray [shape=samples.shape, dtype=int]: The index or indices of frames corresponding to the beginning of each provided block.

See also

blocks_to_samples
blocks_to_time

Examples

Get frame indices for each block in a stream

>>> filename = librosa.ex('brahms')
>>> 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_frame = librosa.blocks_to_frames(n, block_length=16)