swiftffmpeg's Introduction

SwiftFFmpeg

A Swift wrapper for the FFmpeg API.

Note: SwiftFFmpeg is still in development, and the API is not guaranteed to be stable. It's subject to change without warning.

Installation

You should install FFmpeg (Requires FFmpeg 4.0 or higher) before use this library, on macOS, you can:

brew install ffmpeg

Swift Package Manager

SwiftFFmpeg primarily uses SwiftPM as its build tool, so we recommend using that as well. If you want to depend on SwiftFFmpeg in your own project, it's as simple as adding a dependencies clause to your Package.swift:

dependencies: [
    .package(url: "https://github.com/sunlubo/SwiftFFmpeg.git", from: "1.0.0")
]

Documentation

API documentation

Usage

import Foundation
import SwiftFFmpeg

if CommandLine.argc < 2 {
    print("Usage: \(CommandLine.arguments[0]) <input file>")
    exit(1)
}
let input = CommandLine.arguments[1]

let fmtCtx = try AVFormatContext(url: input)
try fmtCtx.findStreamInfo()

fmtCtx.dumpFormat(isOutput: false)

guard let stream = fmtCtx.videoStream else {
    fatalError("No video stream.")
}
guard let codec = AVCodec.findDecoderById(stream.codecParameters.codecId) else {
    fatalError("Codec not found.")
}
let codecCtx = AVCodecContext(codec: codec)
codecCtx.setParameters(stream.codecParameters)
try codecCtx.openCodec()

let pkt = AVPacket()
let frame = AVFrame()

while let _ = try? fmtCtx.readFrame(into: pkt) {
    defer { pkt.unref() }

    if pkt.streamIndex != stream.index {
        continue
    }

    try codecCtx.sendPacket(pkt)

    while true {
        do {
            try codecCtx.receiveFrame(frame)
        } catch let err as AVError where err == .tryAgain || err == .eof {
            break
        }

        let str = String(
            format: "Frame %3d (type=%@, size=%5d bytes) pts %4lld key_frame %d",
            codecCtx.frameNumber,
            frame.pictureType.description,
            frame.pktSize,
            frame.pts,
            frame.isKeyFrame
        )
        print(str)

        frame.unref()
    }
}

print("Done.")

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