Initial commit
A half-working prototype.
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42a430345f
GPG Key ID:
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14
LICENSE
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14
LICENSE
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Copyright (c) 2016, Přemysl Janouch <p.janouch@gmail.com>
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All rights reserved.
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Permission to use, copy, modify, and/or distribute this software for any
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purpose with or without fee is hereby granted, provided that the above
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copyright notice and this permission notice appear in all copies.
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
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OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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49
README.adoc
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49
README.adoc
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bbc-on-ice
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==========
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'bbc-on-ice' is a SHOUTcast (ICY protocol) bridge for BBC radio streams.
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It adds metadata to the stream so that media players can display it.
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Packages
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--------
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Regular releases are sporadic. git master should be stable enough. You can get
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a package with the latest development version from Archlinux's AUR, or from
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openSUSE Build Service for the rest of mainstream distributions. Consult the
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list of repositories and their respective links at:
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https://build.opensuse.org/project/repositories/home:pjanouch:git
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Building and Running
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--------------------
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Build dependencies: CMake, go
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$ git clone --recursive https://github.com/pjanouch/bbc-on-ice.git
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$ mkdir bbc-on-ice/build
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$ cd bbc-on-ice/build
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$ cmake .. -DCMAKE_INSTALL_PREFIX=/usr -DCMAKE_BUILD_TYPE=Debug
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$ make
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To install the application, you can do either the usual:
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# make install
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Or you can try telling CMake to make a package for you. For Debian it is:
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$ cpack -G DEB
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# dpkg -i bbc-on-ice-*.deb
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Contributing and Support
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------------------------
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Use this project's GitHub to report any bugs, request features, or submit pull
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requests. If you want to discuss this project, or maybe just hang out with
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the developer, feel free to join me at irc://irc.janouch.name, channel #dev.
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License
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-------
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'bbc-on-ice' is written by Přemysl Janouch <p.janouch@gmail.com>.
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You may use the software under the terms of the ISC license, the text of which
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is included within the package, or, at your option, you may relicense the work
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under the MIT or the Modified BSD License, as listed at the following site:
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http://www.gnu.org/licenses/license-list.html
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253
bbc-on-ice.go
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253
bbc-on-ice.go
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package main
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import (
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"encoding/json"
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"errors"
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"fmt"
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"io"
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"io/ioutil"
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"log"
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"net/http"
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"os"
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"path"
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"regexp"
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"strings"
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"time"
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"unicode/utf8"
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)
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type meta struct {
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title string // What's playing right now
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timeout uint // Timeout for the next poll in ms
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}
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// Retrieve and decode metadata information from an independent webservice
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func getMeta(name string) (*meta, error) {
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const metaBaseURI = "http://polling.bbc.co.uk/radio/nhppolling/"
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resp, err := http.Get(metaBaseURI + name)
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if err != nil {
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return nil, err
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}
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b, err := ioutil.ReadAll(resp.Body)
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resp.Body.Close()
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if len(b) < 2 {
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// There needs to be an enclosing () pair
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return nil, errors.New("invalid metadata response")
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}
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// TODO: also retrieve richtracks/is_now_playing, see example file
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type broadcast struct {
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Title string `json:"title"` // Title of the broadcast
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Percentage int `json:"percentage"` // How far we're in
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}
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var v struct {
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Packages struct {
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OnAir struct {
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Broadcasts []broadcast `json:"broadcasts"`
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BroadcastNowIndex uint `json:"broadcastNowIndex"`
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} `json:"on-air"`
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} `json:"packages"`
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Timeouts struct {
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PollingTimeout uint `json:"polling_timeout"`
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} `json:"timeouts"`
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}
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err = json.Unmarshal(b[1:len(b)-1], &v)
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if err != nil {
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return nil, errors.New("invalid metadata response")
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}
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onAir := v.Packages.OnAir
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if onAir.BroadcastNowIndex >= uint(len(onAir.Broadcasts)) {
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return nil, errors.New("no active broadcast")
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}
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return &meta{
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timeout: v.Timeouts.PollingTimeout,
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title: onAir.Broadcasts[onAir.BroadcastNowIndex].Title,
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}, nil
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}
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// Resolve an M3U8 playlist to the first link that seems to be playable
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func resolveM3U8(target string) (out []string, err error) {
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resp, err := http.Get(target)
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if err != nil {
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return nil, err
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}
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b, err := ioutil.ReadAll(resp.Body)
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resp.Body.Close()
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if !utf8.Valid(b) {
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return nil, errors.New("invalid UTF-8")
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}
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lines := strings.Split(string(b), "\n")
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for _, line := range lines {
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if strings.HasPrefix(line, "#") {
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continue
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}
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if !strings.Contains(line, "/") {
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// Seems to be a relative link, let's make it absolute
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dir, _ := path.Split(target)
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line = dir + line
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}
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if strings.HasSuffix(line, "m3u8") {
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// The playlist seems to recurse, and so do we
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return resolveM3U8(line)
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}
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out = append(out, line)
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}
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return out, nil
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}
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var pathRE = regexp.MustCompile("^/(.*?)/(.*?)/(.*?)$")
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func proxy(w http.ResponseWriter, req *http.Request) {
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const targetURI = "http://a.files.bbci.co.uk/media/live/manifesto/" +
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"audio/simulcast/hls/%s/%s/ak/%s.m3u8"
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const metaint = 1 << 16
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m := pathRE.FindStringSubmatch(req.URL.Path)
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if m == nil {
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http.NotFound(w, req)
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return
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}
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hijacker, ok := w.(http.Hijacker)
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if !ok {
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// We're not using TLS where HTTP/2 could have caused this
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panic("cannot hijack connection")
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}
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// E.g. `nonuk`, `sbr_low` `bbc_radio_one`, or `uk`, `sbr_high`, `bbc_1xtra`
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region, quality, name := m[1], m[2], m[3]
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// This validates the params as a side-effect
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target, err := resolveM3U8(fmt.Sprintf(targetURI, region, quality, name))
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if err == nil && len(target) == 0 {
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err = errors.New("cannot resolve playlist")
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}
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if err != nil {
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http.Error(w, err.Error(), http.StatusInternalServerError)
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return
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}
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wantMeta := false
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if icyMeta, ok := req.Header["Icy-MetaData"]; ok {
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wantMeta = len(icyMeta) == 1 && icyMeta[0] == "1"
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}
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resp, err := http.Get(target[0])
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if err != nil {
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http.Error(w, err.Error(), http.StatusInternalServerError)
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return
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}
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conn, bufrw, err := hijacker.Hijack()
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if err != nil {
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http.Error(w, err.Error(), http.StatusInternalServerError)
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return
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}
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defer conn.Close()
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// TODO: retrieve some general information from somewhere?
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// There's nothing interesting in the playlist files.
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fmt.Fprintf(bufrw, "ICY 200 OK\r\n")
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fmt.Fprintf(bufrw, "icy-name:%s\r\n", name)
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// BBC marks this as a video type, maybe just force audio/mpeg
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fmt.Fprintf(bufrw, "content-type:%s\r\n", resp.Header["Content-Type"][0])
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fmt.Fprintf(bufrw, "icy-pub:%d\r\n", 0)
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if wantMeta {
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fmt.Fprintf(bufrw, "icy-metaint: %d\r\n", metaint)
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}
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fmt.Fprintf(bufrw, "\r\n")
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// TODO: move to a normal function
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metaChan := make(chan string)
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go func() {
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var current, last string
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var interval time.Duration
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for {
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meta, err := getMeta(name)
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if err != nil {
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current = "Error: " + err.Error()
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interval = 30 * time.Second
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} else {
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current = meta.title
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interval = time.Duration(meta.timeout)
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}
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if current != last {
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metaChan <- current
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last = current
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}
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select {
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case <-time.After(time.Duration(interval) * time.Millisecond):
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case <-req.Context().Done():
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return
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}
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}
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}()
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// TODO: move to a normal function
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// FIXME: this will load a few seconds (one URL) and die
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// - we can either try to implement this and hope for the best
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// https://tools.ietf.org/html/draft-pantos-http-live-streaming-20
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// then like https://github.com/kz26/gohls/blob/master/main.go
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// - or we can become more of a proxy, which complicates ICY
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chunkChan := make(chan []byte)
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go func() {
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defer resp.Body.Close()
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defer close(chunkChan)
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for {
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chunk := make([]byte, metaint)
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n, err := io.ReadFull(resp.Body, chunk)
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chunkChan <- chunk[:n]
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if err != nil {
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return
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}
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select {
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default:
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case <-req.Context().Done():
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return
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}
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}
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}()
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var queuedMeta []byte
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makeMetaChunk := func() []byte {
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meta := queuedMeta
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queuedMeta = nil
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for len(meta)%16 != 0 {
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meta = append(meta, 0)
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}
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if len(meta) > 16*255 {
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meta = meta[:16*255]
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}
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chunk := []byte{byte(len(meta) / 16)}
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return append(chunk, meta...)
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}
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for {
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select {
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case title := <-metaChan:
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queuedMeta = []byte(fmt.Sprintf("StreamTitle='%s'", title))
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case chunk, connected := <-chunkChan:
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if !connected {
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return
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}
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if wantMeta {
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chunk = append(chunk, makeMetaChunk()...)
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}
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if _, err := bufrw.Write(chunk); err != nil {
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return
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}
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if err := bufrw.Flush(); err != nil {
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return
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}
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}
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}
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}
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func main() {
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// TODO: also try to support systemd socket activation
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address := ":8000"
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if len(os.Args) == 2 {
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address = os.Args[1]
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}
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http.HandleFunc("/", proxy)
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log.Fatal(http.ListenAndServe(address, nil))
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}
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