Moved converters to other file, added methods for video and gif, which supports resize.

XXX: videos don't want to be played by riot, i don't know why...

mautrix_telegram/util/tgs_converter.py

@@ -0,0 +1,148 @@
+# Generated by Netbeans
+# Author: Eramde
+# Date: 09.2019
+
+from typing import Optional, Tuple, Union, Dict
+
+
+import logging
+
+LOG: logging.Logger = logging.getLogger("mau.util.tgs")
+
+try:
+
+    import cairosvg
+    from io import BytesIO, StringIO
+    from tgs.objects import Animation
+    from tgs.parsers.tgs import parse_tgs as tgs_importer
+    from tgs.exporters import svg as tgs_svg_exporter
+
+    def _tgs_to_png(animation: Animation, width: int = None,
+                    height: int = None, frame: int = None) -> Tuple[bytes, Optional[bytes]]:
+        if not frame:
+            frame = int(animation.out_point * 0.3)
+        if not (width and height):
+            width = animation.width
+            height = animation.height
+        svg = StringIO()
+        tgs_svg_exporter.export_svg(animation, svg, frame=frame)
+        svg.seek(0)
+        fo = BytesIO()
+        cairosvg.svg2png(file_obj=svg, write_to=fo, output_width=width, output_height=height)
+        return fo.getvalue(), None
+
+    TGS_CONVERTERS = {"image": _tgs_to_png}
+
+    try:
+        from PIL import Image
+
+        def _tgs_to_gif(animation: Animation, width: int = None, height: int = None) \
+                -> Tuple[bytes, Optional[bytes]]:
+            """
+            FIXME: copy-pasted from tgs.exporters.gif, because it's method don't resize images
+            """
+            start = int(animation.in_point)
+            end = int(animation.out_point)
+            skip_frames = 5
+            frames = []
+            first_frame = None
+            for i in range(start, end + 1, skip_frames):
+                frame, _ = _tgs_to_png(animation, width, height, i)
+                if not first_frame:
+                    first_frame = frame
+                image = Image.open(BytesIO(frame))
+                if image.mode not in ["RGBA", "RGBa"]:
+                    image = image.convert("RGBA")
+                alpha = image.getchannel("A")
+                image = image.convert('P', palette=Image.ADAPTIVE, colors=255)
+                mask = Image.eval(alpha, lambda a: 255 if a <= 128 else 0)
+                image.paste(255, mask)
+                frames.append(image)
+
+            duration = 1000 / animation.frame_rate
+            fo = BytesIO()
+            frames[0].save(
+                fo,
+                format='GIF',
+                append_images=frames[1:],
+                save_all=True,
+                duration=duration,
+                loop=0,
+                transparency=255,
+                disposal=2,
+            )
+            return fo.getvalue(), first_frame
+
+        TGS_CONVERTERS.update({"gif": _tgs_to_gif})
+    except ImportError:
+        LOG.warn("Unable to create tgs to gif converter, install PIL")
+
+    try:
+        import cv2
+        import numpy
+        import tempfile
+        import os
+        from PIL import Image
+
+        def _tgs_to_video(animation: Animation, width: int = None, height: int = None) \
+                -> Tuple[bytes, Optional[bytes]]:
+            """
+            FIXME: copy-pasted from tgs.exporters.video, because it's method don't resize images
+            """
+            start = int(animation.in_point)
+            end = int(animation.out_point)
+            with tempfile.NamedTemporaryFile(mode="r+b", suffix=".mp4") as tmp:
+                video_tmp_file = tmp.name
+            video = None
+            first_frame = None
+            try:
+                video = cv2.VideoWriter(filename=video_tmp_file, apiPreference=cv2.CAP_ANY,
+                                        fourcc=cv2.VideoWriter_fourcc(*'vp09'),
+                                        fps=int(animation.frame_rate),
+                                        frameSize=(width or animation.width,
+                                                   height or animation.height))
+
+                for i in range(start, end + 1):
+                    frame, _ = _tgs_to_png(animation, width, height, i)
+                    if not first_frame:
+                        first_frame = frame
+                    video.write(cv2.cvtColor(numpy.array(Image.open(BytesIO(frame))),
+                                             cv2.COLOR_RGB2BGR))
+
+            finally:
+                if video:
+                    video.release()
+            with open(video_tmp_file, "rb") as video_file:
+                out = video_file.read()
+            os.remove(video_tmp_file)
+            return out, first_frame
+        """
+        It seems, that riot don't wont to play converted videos...
+        """
+        TGS_CONVERTERS.update({"video": _tgs_to_video})
+    except ImportError:
+        LOG.warn("Unable to create tgs to video converter, "
+                 "install PIL, numpy and opencv-python-headless")
+
+except (ImportError, OSError):
+    LOG.exception("Unable to init tgs converters, possibly missing tgs and/or cairo libraries")
+    TGS_CONVERTERS = {}
+
+TYPE_TO_MIME = {"image": "image/png", "gif": "image/gif", "video": "video/mp4"}
+
+
+def convert_tgs(file: bytes, convert_to: str, width: int = None, height: int = None) \
+        -> Tuple[str, bytes, Optional[int], Optional[int], Optional[bytes]]:
+    if convert_to in TGS_CONVERTERS:
+        converter = TGS_CONVERTERS[convert_to]
+        mime = TYPE_TO_MIME[convert_to]
+        try:
+            animation = tgs_importer(BytesIO(file))
+            out, preview = converter(animation, width, height)
+            return mime, out, width or animation.width, height or animation.height, preview
+        # Yep... some animations crash library...
+        except AttributeError:
+            LOG.exception("Error occurred while converting animated sticker")
+    else:
+        LOG.warning(f"Unable to convert animated sticker, no converter for type {convert_to}")
+    return "application/gzip", file, None, None, None