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GoPro Metadata Format Parser

Introduction

This is a fork of JuanIrache gopro-utils that retains only the package, to be used in other Golang code.

Upstream info

I have recently switched my efforts to a more comprehensive JavaScript version of these tools, but feel free to send a PR if you think you can improve this one

Examples of what can be achieved: https://goprotelemetryextractor.com/gallery

User friendly and cross-platform tool for extracting the telemetry: https://goprotelemetryextractor.com/free

The Protocol

Data starts with a label that describes the data following it. Values are all big endian, and floats are IEEE 754. Everything is packed to 4 bytes where applicable, padded with zeroes so it's 32-bit aligned.

  • Labels - human readable types of proceeding data
  • Type - single ascii character describing data
  • Size - how big is the data type
  • Count - how many values are we going to get
  • Length = size * count

Labels include:

  • ACCL - accelerometer reading x/y/z
  • DEVC - device
  • DVID - device ID, possibly hard-coded to 0x1
  • DVNM - devicde name, string "Camera"
  • EMPT - empty packet
  • GPS5 - GPS data (lat, lon, alt, speed, 3d speed)
  • GPSF - GPS fix (none, 2d, 3d)
  • GPSP - GPS positional accuracy in cm
  • GPSU - GPS acquired timestamp; potentially different than "camera time"
  • GYRO - gryroscope reading x/y/z
  • SCAL - scale factor, a multiplier for subsequent data
  • SIUN - SI units; strings (m/s², rad/s)
  • STRM - ¯\_(ツ)_/¯
  • TMPC - temperature
  • TSMP - total number of samples
  • UNIT - alternative units; strings (deg, m, m/s)

Types include:

  • c - single char
  • L - unsigned long
  • s - signed short
  • S - unsigned short
  • f - 32 float

For implementation details, see reader.go and other corresponding files in telemetry/.