Max Kellermann
154 lines
3.5 KiB
C++
154 lines
3.5 KiB
C++
/*
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* Copyright 2003-2022 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "ExtM3uPlaylistPlugin.hxx"
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#include "../PlaylistPlugin.hxx"
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#include "../SongEnumerator.hxx"
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#include "song/DetachedSong.hxx"
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#include "tag/Tag.hxx"
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#include "tag/Builder.hxx"
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#include "util/StringStrip.hxx"
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#include "util/StringCompare.hxx"
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#include "input/TextInputStream.hxx"
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#include "input/InputStream.hxx"
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#include <string.h>
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#include <stdlib.h>
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class ExtM3uPlaylist final : public SongEnumerator {
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TextInputStream tis;
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public:
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explicit ExtM3uPlaylist(InputStreamPtr &&is)
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:tis(std::move(is)) {
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}
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/**
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* @return nullptr if ExtM3U was recognized, or the original
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* InputStream on error
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*/
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InputStreamPtr CheckFirstLine() {
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char *line = tis.ReadLine();
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if (line == nullptr)
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return tis.StealInputStream();
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StripRight(line);
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if (strcmp(line, "#EXTM3U") != 0)
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return tis.StealInputStream();
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return nullptr;
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}
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std::unique_ptr<DetachedSong> NextSong() override;
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};
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static std::unique_ptr<SongEnumerator>
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extm3u_open_stream(InputStreamPtr &&is)
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{
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auto playlist = std::make_unique<ExtM3uPlaylist>(std::move(is));
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is = playlist->CheckFirstLine();
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if (is)
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/* no EXTM3U header: fall back to the plain m3u
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plugin */
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playlist.reset();
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return playlist;
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}
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/**
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* Parse a EXTINF line.
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*
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* @param line the rest of the input line after the colon
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*/
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static Tag
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extm3u_parse_tag(const char *line)
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{
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long duration;
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char *endptr;
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const char *name;
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duration = strtol(line, &endptr, 10);
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if (endptr[0] != ',')
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/* malformed line */
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return {};
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if (duration < 0)
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/* 0 means unknown duration */
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duration = 0;
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name = StripLeft(endptr + 1);
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if (*name == 0 && duration == 0)
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/* no information available; don't allocate a tag
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object */
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return {};
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TagBuilder tag;
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tag.SetDuration(SignedSongTime::FromS(unsigned(duration)));
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/* unfortunately, there is no real specification for the
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EXTM3U format, so we must assume that the string after the
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comma is opaque, and is just the song name*/
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if (*name != 0)
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tag.AddItem(TAG_NAME, name);
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return tag.Commit();
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}
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std::unique_ptr<DetachedSong>
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ExtM3uPlaylist::NextSong()
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{
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Tag tag;
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char *line_s;
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do {
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line_s = tis.ReadLine();
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if (line_s == nullptr)
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return nullptr;
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StripRight(line_s);
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if (StringStartsWith(line_s, "#EXTINF:")) {
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tag = extm3u_parse_tag(line_s + 8);
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continue;
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}
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line_s = StripLeft(line_s);
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} while (line_s[0] == '#' || *line_s == 0);
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return std::make_unique<DetachedSong>(line_s, std::move(tag));
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}
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static const char *const extm3u_suffixes[] = {
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"m3u",
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"m3u8",
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nullptr
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};
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static const char *const extm3u_mime_types[] = {
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"audio/x-mpegurl",
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"audio/mpegurl",
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nullptr
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};
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constexpr PlaylistPlugin extm3u_playlist_plugin =
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PlaylistPlugin("extm3u", extm3u_open_stream)
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.WithSuffixes(extm3u_suffixes)
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.WithMimeTypes(extm3u_mime_types);
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