[feature] support processing of (many) more media types (#3090)

* initial work replacing our media decoding / encoding pipeline with ffprobe + ffmpeg

* specify the video codec to use when generating static image from emoji

* update go-storage library (fixes incompatibility after updating go-iotools)

* maintain image aspect ratio when generating a thumbnail for it

* update readme to show go-ffmpreg

* fix a bunch of media tests, move filesize checking to callers of media manager for more flexibility

* remove extra debug from error message

* fix up incorrect function signatures

* update PutFile to just use regular file copy, as changes are file is on separate partition

* fix remaining tests, remove some unneeded tests now we're working with ffmpeg/ffprobe

* update more tests, add more code comments

* add utilities to generate processed emoji / media outputs

* fix remaining tests

* add test for opus media file, add license header to utility cmds

* limit the number of concurrently available ffmpeg / ffprobe instances

* reduce number of instances

* further reduce number of instances

* fix envparsing test with configuration variables

* update docs and configuration with new media-{local,remote}-max-size variables

1 files changed, 0 insertions, 93 deletions

diff --git a/vendor/codeberg.org/superseriousbusiness/exif-terminator/png.go b/vendor/codeberg.org/superseriousbusiness/exif-terminator/png.go
deleted file mode 100644
index 774ec0ed6..000000000
--- a/vendor/codeberg.org/superseriousbusiness/exif-terminator/png.go
+++ /dev/null
@@ -1,93 +0,0 @@
-/*
-   exif-terminator
-   Copyright (C) 2022 SuperSeriousBusiness admin@gotosocial.org
-
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Affero General Public License as published by
-   the Free Software Foundation, either version 3 of the License, or
-   (at your option) any later version.
-
-   This program is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-   GNU Affero General Public License for more details.
-
-   You should have received a copy of the GNU Affero General Public License
-   along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*/
-
-package terminator
-
-import (
-	"io"
-
-	pngstructure "github.com/superseriousbusiness/go-png-image-structure/v2"
-)
-
-type pngVisitor struct {
-	ps               *pngstructure.PngSplitter
-	writer           io.Writer
-	lastWrittenChunk int
-}
-
-func (v *pngVisitor) split(data []byte, atEOF bool) (int, []byte, error) {
-	// execute the ps split function to read in data
-	advance, token, err := v.ps.Split(data, atEOF)
-	if err != nil {
-		return advance, token, err
-	}
-
-	// if we haven't written anything at all yet, then write the png header back into the writer first
-	if v.lastWrittenChunk == -1 {
-		if _, err := v.writer.Write(pngstructure.PngSignature[:]); err != nil {
-			return advance, token, err
-		}
-	}
-
-	// Check if the splitter now has
-	// any new chunks in it for us.
-	chunkSlice, err := v.ps.Chunks()
-	if err != nil {
-		return advance, token, err
-	}
-
-	// Write each chunk by passing it
-	// through our custom write func,
-	// which strips out exif and fixes
-	// the CRC of each chunk.
-	chunks := chunkSlice.Chunks()
-	for i, chunk := range chunks {
-		if i <= v.lastWrittenChunk {
-			// Skip already
-			// written chunks.
-			continue
-		}
-
-		// Write this new chunk.
-		if err := v.writeChunk(chunk); err != nil {
-			return advance, token, err
-		}
-		v.lastWrittenChunk = i
-
-		// Zero data; here you
-		// go garbage collector.
-		chunk.Data = nil
-	}
-
-	return advance, token, err
-}
-
-func (v *pngVisitor) writeChunk(chunk *pngstructure.Chunk) error {
-	if chunk.Type == pngstructure.EXifChunkType {
-		// Replace exif data
-		// with zero bytes.
-		clear(chunk.Data)
-	}
-
-	// Fix CRC of each chunk.
-	chunk.UpdateCrc32()
-
-	// finally, write chunk to writer.
-	_, err := chunk.WriteTo(v.writer)
-	return err
-}