sync/lib/ffmpeg.js

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var Logger = require("./logger");
var Config = require("./config");
var spawn = require("child_process").spawn;
var acceptedCodecs = {
"mov/h264": true,
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"flv/h264": true,
"matroska/vp8": true,
"matroska/vp9": true,
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"ogg/theora": true
};
var acceptedAudioCodecs = {
"mp3": true,
"vorbis": true
};
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var audioOnlyContainers = {
"mp3": true
};
exports.query = function (filename, cb) {
if (!Config.get("ffmpeg.enabled")) {
return cb("Raw file playback is not enabled on this server");
}
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if (!filename.match(/^https?:\/\//)) {
return cb("Raw file playback is only supported for links accessible via HTTP " +
"or HTTPS");
}
ffprobe(filename, function (err, meta) {
if (err) {
if (meta.stderr && meta.stderr.match(/Protocol not found/)) {
return cb("Link uses a protocol unsupported by this server's ffmpeg");
} else {
return cb("Unable to query file data with ffmpeg");
}
}
meta = parse(meta);
if (meta == null) {
return cb("Unknown error");
}
if (isVideo(meta)) {
var codec = meta.container + "/" + meta.vcodec;
if (!(codec in acceptedCodecs)) {
return cb("Unsupported video codec " + codec);
}
var data = {
title: meta.title || "Raw Video",
duration: Math.ceil(meta.seconds),
bitrate: meta.bitrate,
codec: codec
};
cb(null, data);
} else if (isAudio(meta)) {
var codec = meta.acodec;
if (!(codec in acceptedAudioCodecs)) {
return cb("Unsupported audio codec " + codec);
}
var data = {
title: meta.title || "Raw Audio",
duration: Math.ceil(meta.seconds),
bitrate: meta.bitrate,
codec: codec
};
cb(null, data);
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} else if (data.ffmpegErr.match(/Protocol not found/)) {
return cb("This server is unable to load videos over the " +
filename.split(":")[0] + " protocol.");
} else {
return cb("Parsed metadata did not contain a valid video or audio stream. " +
"Either the file is invalid or it has a format unsupported by " +
"this server's version of ffmpeg.");
}
});
};
function isVideo(meta) {
return meta.vcodec && !(meta.container in audioOnlyContainers);
}
function isAudio(meta) {
return meta.acodec;
}
function parse(meta) {
if (meta == null) {
return null;
}
if (!meta.format) {
return null;
}
var data = {};
meta.streams.forEach(function (s) {
if (s.codec_type === "video") {
data.vcodec = s.codec_name;
} else if (s.codec_type === "audio") {
data.acodec = s.codec_name;
}
});
data.container = meta.format.format_name.split(",")[0];
data.bitrate = parseInt(meta.format.bit_rate) / 1000;
if (meta.format.tags) {
data.title = meta.format.tags.title;
}
data.seconds = Math.ceil(parseFloat(meta.format.duration));
return data;
}
function ffprobe(filename, cb) {
var ff = spawn("ffprobe", ["-show_streams", "-show_format", filename]);
var outbuf = "";
var errbuf = "";
ff.stdout.on("data", function (data) {
outbuf += data;
});
ff.stderr.on("data", function (data) {
errbuf += data;
});
ff.on("close", function (code) {
if (code !== 0) {
return cb("ffprobe exited with nonzero exit code", { stderr: errbuf });
}
var lines = outbuf.split("\n");
var streams = [];
var format = {};
var data = {};
lines.forEach(function (line) {
if (line.match(/\[stream\]|\[format\]/i)) {
return;
} else if (line.match(/\[\/stream\]/i)) {
streams.push(data);
data = {};
} else if (line.match(/\[\/format\]/i)) {
format = data;
data = {};
} else {
var kv = line.split("=");
data[kv[0]] = kv[1];
}
});
cb(null, {
streams: streams,
format: format
});
});
}