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Build a graph of all artists played on a BBC Radio show and their last.fm tags
<?php
define('LASTFM_API_KEY', 'EDIT_THIS'); // get an API key from http://www.last.fm/api
$brand = 'EDIT_THIS'; // PID of the "brand" e.g. b00c72y1 for Marc Riley
$url = sprintf('http://open.live.bbc.co.uk/aps/programmes/%s/episodes/upcoming.json', $brand);
$data = get_json($url);
$count = count($data->broadcasts);
$programme = $data->broadcasts[$count - 1]->programme; // most recent broadcast
$output = fopen($brand . '-edges.csv', 'w');
fputcsv($output, array('Source', 'Target', 'Weight'));
$pids = [];
$tags = [];
$plays = [];
$artists = [];
$tagged = [];
do {
$details = get_programme($programme->pid);
$canonicalPID = canonical_version($details);
if (!array_key_exists($canonicalPID, $pids)) {
$pids[$canonicalPID] = true;
$canonical = get_version($canonicalPID);
foreach ($canonical->segment_events as $event) {
$segment = $event->segment;
if ($segment->type !== 'music') {
continue;
}
if (!$contributor = $segment->primary_contributor) {
continue;
}
if (!$mbid = $contributor->musicbrainz_gid) {
continue;
}
if (!$name = $contributor->name) {
continue;
}
if (!array_key_exists($mbid, $artists)) {
$artists[$mbid] = $name;
}
if (!array_key_exists($mbid, $plays)) {
$plays[$mbid] = 0;
}
$plays[$mbid]++;
if (!array_key_exists($mbid, $tagged)) {
$tagged[$mbid] = true;
foreach (get_tags($mbid) as $tag) {
if ($tag->count < 10) {
break;
}
if (!array_key_exists($tag->name, $tags)) {
$tags[$tag->name] = 0;
}
$tags[$tag->name]++;
fputcsv($output, array($mbid, $tag->name, $tag->count));
}
}
}
}
$programme = $details->peers->previous;
} while ($programme);
fclose($output);
$output = fopen($brand . '-nodes.csv', 'w');
fputcsv($output, array('ID', 'Label', 'Type', 'Plays'));
foreach ($artists as $mbid => $name) {
fputcsv($output, array($mbid, $name, 'artist', $plays[$mbid]));
}
foreach ($tags as $tag => $count) {
fputcsv($output, array($tag, $tag, 'tag'));
}
fclose($output);
function get_json($url) {
print $url . "\n";
$json = file_get_contents($url);
return json_decode($json);
}
function get_tags($mbid) {
$url = 'http://ws.audioscrobbler.com/2.0/?' . http_build_query(array(
'method' => 'artist.gettoptags',
'mbid' => $mbid,
'api_key' => LASTFM_API_KEY,
'format' => 'json',
));
$data = get_json($url);
if (!$data->toptags) {
return [];
}
return $data->toptags->tag;
}
function get_programme($pid) {
$url = sprintf('http://open.live.bbc.co.uk/aps/programmes/%s.json', $pid);
$data = get_json($url);
return $data->programme;
}
function get_version($pid) {
$url = sprintf('http://open.live.bbc.co.uk/aps/programmes/%s.json', $pid);
$data = get_json($url);
return $data->version;
}
function canonical_version($details) {
foreach ($details->versions as $version) {
if ($version->canonical) {
return $version->pid;
}
}
}
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