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| import gradio as gr | |
| import math | |
| import time | |
| import numpy as np | |
| from pydub import AudioSegment | |
| import io | |
| def numpy_to_mp3(audio_array, sampling_rate): | |
| # Normalize audio_array if it's floating-point | |
| if np.issubdtype(audio_array.dtype, np.floating): | |
| max_val = np.max(np.abs(audio_array)) | |
| audio_array = (audio_array / max_val) * 32767 # Normalize to 16-bit range | |
| audio_array = audio_array.astype(np.int16) | |
| # Create an audio segment from the numpy array | |
| audio_segment = AudioSegment( | |
| audio_array.tobytes(), | |
| frame_rate=sampling_rate, | |
| sample_width=audio_array.dtype.itemsize, | |
| channels=1 | |
| ) | |
| # Export the audio segment to MP3 bytes - use a high bitrate to maximise quality | |
| mp3_io = io.BytesIO() | |
| audio_segment.export(mp3_io, format="mp3", bitrate="320k") | |
| # Get the MP3 bytes | |
| mp3_bytes = mp3_io.getvalue() | |
| mp3_io.close() | |
| return mp3_bytes | |
| def stream(audio, chunk_length_s): | |
| start_time = time.time() | |
| sampling_rate, array = audio | |
| chunk_length = int(chunk_length_s * sampling_rate) | |
| time_length = chunk_length_s / 2 # always stream outputs faster than it takes to process | |
| audio_length = len(array) | |
| num_batches = math.ceil(audio_length / chunk_length) | |
| for idx in range(num_batches): | |
| time.sleep(time_length) | |
| start_pos = idx * chunk_length | |
| end_pos = min((idx + 1) * chunk_length, audio_length) | |
| chunk = array[start_pos : end_pos] | |
| chunk_mp3 = numpy_to_mp3(chunk, sampling_rate=sampling_rate) | |
| if idx == 0: | |
| first_time = round(time.time() - start_time, 2) | |
| run_time = round(time.time() - start_time, 2) | |
| yield chunk_mp3, first_time, run_time | |
| with gr.Blocks() as demo: | |
| with gr.Row(): | |
| with gr.Column(): | |
| audio_in = gr.Audio(value="librispeech.wav", sources=["upload"], type="numpy") | |
| chunk_length = gr.Slider(minimum=2, maximum=10, value=2, step=2, label="Chunk length (s)") | |
| run_button = gr.Button("Stream audio") | |
| with gr.Column(): | |
| audio_out = gr.Audio(streaming=True, autoplay=True, format="mp3", label="mp3") | |
| first_time = gr.Textbox(label="Time to first chunk (s)") | |
| run_time = gr.Textbox(label="Time to current chunk (s)") | |
| run_button.click(fn=stream, inputs=[audio_in, chunk_length], outputs=[audio_out, first_time, run_time]) | |
| demo.launch() |