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Syncing Echo Nest analysis to Spotify playback
function showSegmentInfo() {
var pos = $("#pos");
var snum = $("#seg-num");
var stime = $("#seg-time");
var sbar = $("#bar");
var sbeat = $("#beat");
var sdur = $("#seg-dur");
var sconf = $("#seg-conf");
var sloud = $("#seg-loud");
var spitch = $("#seg-pitch");
var stimbre = $("#seg-timbre");
var tp = sp.trackPlayer;
var segIndex = 0;
var lastSegIndex = -1;
var beatIndex = 0;
var barIndex = 0;
function findNextBeat(time) {
if (cur_analysis) {
var qs = cur_analysis.beats;
var l = qs.length;
for (var i = beatIndex; i < l; i++) {
var q = qs[i];
if (time >= q.start && time < q.start + q.duration) {
beatIndex = i;
return q;
}
}
beatIndex = 0;
}
return null;
}
function isBeat(time) {
var beat = findNextBeat(time);
if (beat) {
if (beat.confidence > .0 && beat.start >= time - beat.duration / 2) {
return true;
}
}
return false;
}
function findNextBar(time) {
if (cur_analysis) {
var qs = cur_analysis.bars;
var l = qs.length;
for (var i = barIndex; i < l; i++) {
var q = qs[i];
if (time >= q.start && time < q.start + q.duration) {
barIndex = i;
return q;
}
}
barIndex = 0;
}
return null;
}
function isBar(time) {
var bar = findNextBar(time);
if (bar) {
if (bar.start >= time - bar.duration / 2) {
return true;
}
}
return false;
}
function findNextSegment(time) {
if (cur_analysis) {
var segs = cur_analysis.segments;
var lsegs = segs.length;
for (var i = segIndex; i < lsegs; i++) {
var seg = segs[i];
if (time >= seg.start && time < seg.start + seg.duration) {
if (i != segIndex) {
segIndex = i;
return seg;
} else {
return null;
}
}
}
segIndex = 0;
}
return null;
}
var lastTrack = null;
function show() {
var t = tp.getNowPlayingTrack();
if (t) {
var thisTrack = t.track;
if (lastTrack == null || lastTrack.uri != thisTrack.uri) {
lastTrack = thisTrack;
fetchSongInfo(thisTrack);
}
var time = t.position / 1000.;
pos.text(t.position)
seg = findNextSegment(time)
if (seg) {
snum.text(segIndex);
stime.text(seg.start.toPrecision(4));
sdur.text(seg.duration.toPrecision(4));
sconf.text(seg.confidence.toPrecision(4));
sloud.text(seg.loudness_start.toPrecision(4));
var pitches = '';
for (var i = 0; i < seg.pitches.length; i++) {
pitches = pitches + ' ' + seg.pitches[i].toPrecision(2);
}
spitch.text(pitches);
var timbre = '';
for (var i = 0; i < seg.timbre.length; i++) {
timbre = timbre + ' ' + seg.timbre[i].toPrecision(4);
}
stimbre.text(timbre);
}
if (isBar(time)) {
sbar.text('bar');
} else {
sbar.empty();
}
if (isBeat(time)) {
sbeat.text('beat');
} else {
sbeat.empty();
}
}
}
return show;
}
function fetchSongInfo(track) {
info('Getting song info for ' + track.name + ' by ' + track.artists[0].name);
var url = 'http://developer.echonest.com/api/v4/track/profile?api_key=N6E4NIOVYMTHNDM8J&callback=?';
var track_id = fromSpotify(track.uri);
$.getJSON(url, { id: track_id, format:'jsonp', bucket : 'audio_summary'}, function(data) {
if (checkResponse(data)) {
info("");
showTrackInfo(data.response.track);
fetchAnalysis(data.response.track);
} else {
info("trouble getting results");
}
});
}
function fetchAnalysis(track) {
info('Getting analysis info for ' + track.title + ' by ' + track.artist);
var url = 'http://labs.echonest.com/3dServer/analysis?callback=?';
cur_analysis = null;
$.getJSON(url, { url: track.audio_summary.analysis_url}, function(data) {
if ('meta' in data) {
info("Got the analysis");
cur_analysis = data;
} else {
info("trouble getting analysis");
}
});
}
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