[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, 85 deletions

diff --git a/vendor/github.com/superseriousbusiness/go-png-image-structure/v2/media_parser.go b/vendor/github.com/superseriousbusiness/go-png-image-structure/v2/media_parser.go
deleted file mode 100644
index 4c8421905..000000000
--- a/vendor/github.com/superseriousbusiness/go-png-image-structure/v2/media_parser.go
+++ /dev/null
@@ -1,85 +0,0 @@
-package pngstructure
-
-import (
-	"bufio"
-	"bytes"
-	"image"
-	"io"
-	"os"
-
-	"image/png"
-
-	riimage "github.com/dsoprea/go-utility/v2/image"
-)
-
-// PngMediaParser knows how to parse a PNG stream.
-type PngMediaParser struct {
-}
-
-// NewPngMediaParser returns a new `PngMediaParser`.
-func NewPngMediaParser() riimage.MediaParser {
-	return new(PngMediaParser)
-}
-
-// Parse parses a PNG stream given a `io.ReadSeeker`.
-func (pmp *PngMediaParser) Parse(
-	rs io.ReadSeeker,
-	size int,
-) (riimage.MediaContext, error) {
-	ps := NewPngSplitter()
-	if err := ps.readHeader(rs); err != nil {
-		return nil, err
-	}
-
-	s := bufio.NewScanner(rs)
-
-	// Since each segment can be any
-	// size, our buffer must be allowed
-	// to grow as large as the file.
-	buffer := []byte{}
-	s.Buffer(buffer, size)
-	s.Split(ps.Split)
-
-	for s.Scan() {
-	}
-
-	if err := s.Err(); err != nil {
-		return nil, err
-	}
-
-	return ps.Chunks()
-}
-
-// ParseFile parses a PNG stream given a file-path.
-func (pmp *PngMediaParser) ParseFile(filepath string) (riimage.MediaContext, error) {
-	f, err := os.Open(filepath)
-	if err != nil {
-		return nil, err
-	}
-	defer f.Close()
-
-	stat, err := f.Stat()
-	if err != nil {
-		return nil, err
-	}
-
-	size := stat.Size()
-	return pmp.Parse(f, int(size))
-}
-
-// ParseBytes parses a PNG stream given a byte-slice.
-func (pmp *PngMediaParser) ParseBytes(data []byte) (riimage.MediaContext, error) {
-	br := bytes.NewReader(data)
-	return pmp.Parse(br, len(data))
-}
-
-// LooksLikeFormat returns a boolean indicating
-// whether the stream looks like a PNG image.
-func (pmp *PngMediaParser) LooksLikeFormat(data []byte) bool {
-	return bytes.Equal(data[:len(PngSignature)], PngSignature[:])
-}
-
-// GetImage returns an image.Image-compatible struct.
-func (pmp *PngMediaParser) GetImage(r io.Reader) (img image.Image, err error) {
-	return png.Decode(r)
-}