# go-dcp

Library to parse Digital Cinema Packages folders and Content Titles

### TODO:
* Adjust Matroska REPLAYGAIN_GAIN and REPLAYGAIN_PEAK to bring 85 dBc to 89 according to: `Cinemas are calibrated to the SMPTE RP 200:2012 standard where a -20 dB RMS pink noise signal is measured to 85 dBc and the reference fader level is set to 0.`

### DCP Samples
* [Tears of Steel 4K DCP](https://download.blender.org/demo/movies/ToS/ToS_4k_DCP.zip)
* [GKID Press Room](https://gkids.com/press/) contains some DCP movie trailers (and full-length ones sometimes)
* Create your own with [DCP-o-MATIC](https://dcpomatic.com/) or [OpenDCP](https://www.opendcp.org/)

### Compilation
```shell
GOROOT=~/go/go1.22.4 ./build-tools.sh
```

## dcp tool
This tool can be used to view information, verify or split DCPs.

`-dcp` parameter can be either a DCP folder or an ASSETMAP path. Supports HTTP(s) URLs.

### info
Outputs DCP information in Markdown

```shell
./bin/dcp -mode info \
-dcp /path/to/dcp/tos_version_05/
```

### verify
Verifies DCP SHA1 hashes, media files and outputs the information in Markdown

```shell
./bin/dcp -mode verify \
-dcp /path/to/dcp/tos_version_05/
```

### split
Splits multi packing lists DCPs into single DCP into its own folder and soft-links files where possible.

```shell
./bin/dcp -mode split \
-output /path/to/split/output/ \
-dcp /path/to/dcp/tos_version_05/
```

## concat tool
This tool can be used to merge a DCP into a single playable output via ffmpeg.

SMPTE Subtitles not currently supported.

See help for additional parameters to provide a custom CPL, select a specific packing list or drop specific reel ids.

`-dcp` parameter can be either a DCP folder or an ASSETMAP path. Supports HTTP(s) URLs.

```shell
./bin/concat \
-audio-channel-mapping auto \
-flac \
-out /path/to/output.mkv \
-dcp /path/to/dcp/tos_version_05/
```


## playback tool
This tool can be used to playback a DCP via [xyz2yuv](https://git.gammaspectra.live/WeebDataHoarder/xyz2yuv) and [mpv](https://mpv.io/).

mpv will receive Rec. 2020 10-bit 4:4:4 decoded video, and original audio from DCP. Supports converting IOP subtitles to ASS.

See help for additional parameters to provide a custom CPL, select a specific packing list or drop specific reel ids.

`-dcp` parameter can be either a DCP folder or an ASSETMAP path. Supports HTTP(s) URLs.

```shell
./bin/playback \
-audio-channel-mapping auto \
-xyz2yuv /path/to/bin/xyz2yuv \
-mpv /path/to/bin/mpv \
-dcp /path/to/dcp/tos_version_05/
```