modules/gradio.py

# modules.gradio 
# holds updates and lost code from gradio changes
import os
import gradio as gr
import numpy as np
import PIL
import PIL.Image
import shutil
import subprocess
from tempfile import NamedTemporaryFile
from pathlib import Path


class MatplotlibBackendMananger:
    def __enter__(self):
        try:
            import matplotlib

            self._original_backend = matplotlib.get_backend()
            matplotlib.use("agg")
        except ImportError:
            pass

    def __exit__(self, exc_type, exc_val, exc_tb):
        try:
            import matplotlib

            matplotlib.use(self._original_backend)
        except ImportError:
            pass

gr.utils.MatplotlibBackendMananger = MatplotlibBackendMananger

def make_waveform(
    audio: str | tuple[int, np.ndarray],
    *,
    bg_color: str = "#f3f4f6",
    bg_image: str | None = None,
    fg_alpha: float = 0.75,
    bars_color: str | tuple[str, str] = ("#fbbf24", "#ea580c"),
    bar_count: int = 50,
    bar_width: float = 0.6,
    animate: bool = False,
    name: str = "",
) -> str:
    """
    Generates a waveform video from an audio file. Useful for creating an easy to share audio visualization. The output should be passed into a `gr.Video` component.
    Parameters:
        audio: Audio file path or tuple of (sample_rate, audio_data)
        bg_color: Background color of waveform (ignored if bg_image is provided)
        bg_image: Background image of waveform
        fg_alpha: Opacity of foreground waveform
        bars_color: Color of waveform bars. Can be a single color or a tuple of (start_color, end_color) of gradient
        bar_count: Number of bars in waveform
        bar_width: Width of bars in waveform. 1 represents full width, 0.5 represents half width, etc.
        animate: If true, the audio waveform overlay will be animated, if false, it will be static.
    Returns:
        A filepath to the output video in mp4 format.
    """
    import matplotlib.pyplot as plt
    from matplotlib.animation import FuncAnimation

    if isinstance(audio, str):
        audio_file = audio
        audio = gr.processing_utils.audio_from_file(audio)
    else:
        tmp_wav = NamedTemporaryFile(suffix=".wav", delete=False, prefix = name)
        gr.processing_utils.audio_to_file(audio[0], audio[1], tmp_wav.name, format="wav")
        audio_file = tmp_wav.name

    if not os.path.isfile(audio_file):
        raise ValueError("Audio file not found.")

    ffmpeg = shutil.which("ffmpeg")
    if not ffmpeg:
        raise RuntimeError("ffmpeg not found.")

    duration = round(len(audio[1]) / audio[0], 4)

    # Helper methods to create waveform
    def hex_to_rgb(hex_str):
        return [int(hex_str[i : i + 2], 16) for i in range(1, 6, 2)]

    def get_color_gradient(c1, c2, n):
        if n < 1:
            raise ValueError("Must have at least one stop in gradient")
        c1_rgb = np.array(hex_to_rgb(c1)) / 255
        c2_rgb = np.array(hex_to_rgb(c2)) / 255
        mix_pcts = [x / (n - 1) for x in range(n)]
        rgb_colors = [((1 - mix) * c1_rgb + (mix * c2_rgb)) for mix in mix_pcts]
        return [
            "#" + "".join(f"{int(round(val * 255)):02x}" for val in item)
            for item in rgb_colors
        ]

    # Reshape audio to have a fixed number of bars
    samples = audio[1]
    if len(samples.shape) > 1:
        samples = np.mean(samples, 1)
    bins_to_pad = bar_count - (len(samples) % bar_count)
    samples = np.pad(samples, [(0, bins_to_pad)])
    samples = np.reshape(samples, (bar_count, -1))
    samples = np.abs(samples)
    samples = np.max(samples, 1)

    with MatplotlibBackendMananger():
        plt.clf()
        # Plot waveform
        color = (
            bars_color
            if isinstance(bars_color, str)
            else get_color_gradient(bars_color[0], bars_color[1], bar_count)
        )

        if animate:
            fig = plt.figure(figsize=(5, 1), dpi=200, frameon=False)
            fig.subplots_adjust(left=0, bottom=0, right=1, top=1)
        plt.axis("off")
        plt.margins(x=0)

        bar_alpha = fg_alpha if animate else 1.0
        barcollection = plt.bar(
            np.arange(0, bar_count),
            samples * 2,
            bottom=(-1 * samples),
            width=bar_width,
            color=color,
            alpha=bar_alpha,
        )

        tmp_img = NamedTemporaryFile(suffix=".png", delete=False, prefix = name)

        savefig_kwargs: dict[str, Any] = {"bbox_inches": "tight"}
        if bg_image is not None:
            savefig_kwargs["transparent"] = True
            if animate:
                savefig_kwargs["facecolor"] = "none"
        else:
            savefig_kwargs["facecolor"] = bg_color
        plt.savefig(tmp_img.name, **savefig_kwargs)

        if not animate:
            waveform_img = PIL.Image.open(tmp_img.name)
            waveform_img = waveform_img.resize((1000, 400))

            # Composite waveform with background image
            if bg_image is not None:
                waveform_array = np.array(waveform_img)
                waveform_array[:, :, 3] = waveform_array[:, :, 3] * fg_alpha
                waveform_img = PIL.Image.fromarray(waveform_array)

                bg_img = PIL.Image.open(bg_image)
                waveform_width, waveform_height = waveform_img.size
                bg_width, bg_height = bg_img.size
                if waveform_width != bg_width:
                    bg_img = bg_img.resize(
                        (
                            waveform_width,
                            2 * int(bg_height * waveform_width / bg_width / 2),
                        )
                    )
                    bg_width, bg_height = bg_img.size
                composite_height = max(bg_height, waveform_height)
                composite = PIL.Image.new(
                    "RGBA", (waveform_width, composite_height), "#FFFFFF"
                )
                composite.paste(bg_img, (0, composite_height - bg_height))
                composite.paste(
                    waveform_img, (0, composite_height - waveform_height), waveform_img
                )
                composite.save(tmp_img.name)
                img_width, img_height = composite.size
            else:
                img_width, img_height = waveform_img.size
                waveform_img.save(tmp_img.name)
        else:

            def _animate(_):
                for idx, b in enumerate(barcollection):
                    rand_height = np.random.uniform(0.8, 1.2)
                    b.set_height(samples[idx] * rand_height * 2)
                    b.set_y((-rand_height * samples)[idx])

            frames = int(duration * 10)
            anim = FuncAnimation(
                fig,  # type: ignore
                _animate,  # type: ignore
                repeat=False,
                blit=False,
                frames=frames,
                interval=100,
            )
            anim.save(
                tmp_img.name,
                writer="pillow",
                fps=10,
                codec="png",
                savefig_kwargs=savefig_kwargs,
            )

    # Convert waveform to video with ffmpeg
    output_mp4 = NamedTemporaryFile(suffix=".mp4", delete=False, prefix = name)

    if animate and bg_image is not None:
        ffmpeg_cmd = [
            ffmpeg,
            "-loop",
            "1",
            "-i",
            bg_image,
            "-i",
            tmp_img.name,
            "-i",
            audio_file,
            "-filter_complex",
            "[0:v]scale=w=trunc(iw/2)*2:h=trunc(ih/2)*2[bg];[1:v]format=rgba,colorchannelmixer=aa=1.0[ov];[bg][ov]overlay=(main_w-overlay_w*0.9)/2:main_h-overlay_h*0.9/2[output]",
            "-t",
            str(duration),
            "-map",
            "[output]",
            "-map",
            "2:a",
            "-c:v",
            "libx264",
            "-c:a",
            "aac",
            "-shortest",
            "-y",
            output_mp4.name,
        ]
    elif animate and bg_image is None:
        ffmpeg_cmd = [
            ffmpeg,
            "-i",
            tmp_img.name,
            "-i",
            audio_file,
            "-filter_complex",
            "[0:v][1:a]concat=n=1:v=1:a=1[v];[v]scale=1000:400,format=yuv420p[v_scaled]",
            "-map",
            "[v_scaled]",
            "-map",
            "1:a",
            "-c:v",
            "libx264",
            "-c:a",
            "aac",
            "-shortest",
            "-y",
            output_mp4.name,
        ]
    else:
        ffmpeg_cmd = [
            ffmpeg,
            "-loop",
            "1",
            "-i",
            tmp_img.name,
            "-i",
            audio_file,
            "-vf",
            f"color=c=#FFFFFF77:s={img_width}x{img_height}[bar];[0][bar]overlay=-w+(w/{duration})*t:H-h:shortest=1",  # type: ignore
            "-t",
            str(duration),
            "-y",
            output_mp4.name,
        ]

    subprocess.check_call(ffmpeg_cmd)
    return output_mp4.name

gr.make_waveform = make_waveform