133 lines
3.6 KiB
Go
133 lines
3.6 KiB
Go
/*
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GoToSocial
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Copyright (C) 2021-2023 GoToSocial Authors admin@gotosocial.org
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU Affero General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Affero General Public License for more details.
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You should have received a copy of the GNU Affero General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package media
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import (
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"fmt"
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"io"
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"github.com/abema/go-mp4"
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"github.com/superseriousbusiness/gotosocial/internal/iotools"
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"github.com/superseriousbusiness/gotosocial/internal/log"
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)
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type gtsVideo struct {
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frame *gtsImage
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duration float32 // in seconds
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bitrate uint64
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framerate float32
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}
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// decodeVideoFrame decodes and returns an image from a single frame in the given video stream.
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// (note: currently this only returns a blank image resized to fit video dimensions).
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func decodeVideoFrame(r io.Reader) (*gtsVideo, error) {
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// we need a readseeker to decode the video...
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tfs, err := iotools.TempFileSeeker(r)
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if err != nil {
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return nil, fmt.Errorf("error creating temp file seeker: %w", err)
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}
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defer func() {
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if err := tfs.Close(); err != nil {
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log.Errorf(nil, "error closing temp file seeker: %s", err)
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}
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}()
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// probe the video file to extract useful metadata from it; for methodology, see:
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// https://github.com/abema/go-mp4/blob/7d8e5a7c5e644e0394261b0cf72fef79ce246d31/mp4tool/probe/probe.go#L85-L154
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info, err := mp4.Probe(tfs)
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if err != nil {
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return nil, fmt.Errorf("error during mp4 probe: %w", err)
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}
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var (
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width int
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height int
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videoBitrate uint64
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audioBitrate uint64
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video gtsVideo
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)
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for _, tr := range info.Tracks {
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if tr.AVC == nil {
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// audio track
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if br := tr.Samples.GetBitrate(tr.Timescale); br > audioBitrate {
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audioBitrate = br
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} else if br := info.Segments.GetBitrate(tr.TrackID, tr.Timescale); br > audioBitrate {
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audioBitrate = br
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}
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if d := float64(tr.Duration) / float64(tr.Timescale); d > float64(video.duration) {
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video.duration = float32(d)
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}
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continue
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}
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// video track
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if w := int(tr.AVC.Width); w > width {
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width = w
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}
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if h := int(tr.AVC.Height); h > height {
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height = h
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}
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if br := tr.Samples.GetBitrate(tr.Timescale); br > videoBitrate {
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videoBitrate = br
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} else if br := info.Segments.GetBitrate(tr.TrackID, tr.Timescale); br > videoBitrate {
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videoBitrate = br
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}
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if d := float64(tr.Duration) / float64(tr.Timescale); d > float64(video.duration) {
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video.framerate = float32(len(tr.Samples)) / float32(d)
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video.duration = float32(d)
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}
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}
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// overall bitrate should be audio + video combined
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// (since they're both playing at the same time)
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video.bitrate = audioBitrate + videoBitrate
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// Check for empty video metadata.
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var empty []string
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if width == 0 {
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empty = append(empty, "width")
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}
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if height == 0 {
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empty = append(empty, "height")
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}
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if video.duration == 0 {
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empty = append(empty, "duration")
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}
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if video.framerate == 0 {
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empty = append(empty, "framerate")
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}
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if video.bitrate == 0 {
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empty = append(empty, "bitrate")
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}
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if len(empty) > 0 {
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return nil, fmt.Errorf("error determining video metadata: %v", empty)
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}
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// Create new empty "frame" image.
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// TODO: decode frame from video file.
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video.frame = blankImage(width, height)
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return &video, nil
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}
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