Input*: move to input/

src/input/plugins/DespotifyInputPlugin.cxx

@@ -0,0 +1,262 @@
+/*
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "config.h"
+#include "DespotifyInputPlugin.hxx"
+#include "DespotifyUtils.hxx"
+#include "../InputStream.hxx"
+#include "../InputPlugin.hxx"
+#include "tag/Tag.hxx"
+#include "util/StringUtil.hxx"
+#include "Log.hxx"
+
+extern "C" {
+#include <despotify.h>
+}
+
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+
+#include <stdio.h>
+
+class DespotifyInputStream {
+	InputStream base;
+
+	struct despotify_session *session;
+	struct ds_track *track;
+	Tag tag;
+	struct ds_pcm_data pcm;
+	size_t len_available;
+	bool eof;
+
+	DespotifyInputStream(const char *uri,
+			     Mutex &mutex, Cond &cond,
+			     despotify_session *_session,
+			     ds_track *_track)
+		:base(input_plugin_despotify, uri, mutex, cond),
+		 session(_session), track(_track),
+		 tag(mpd_despotify_tag_from_track(*track)),
+		 len_available(0), eof(false) {
+
+		memset(&pcm, 0, sizeof(pcm));
+
+		/* Despotify outputs pcm data */
+		base.mime = "audio/x-mpd-cdda-pcm";
+		base.ready = true;
+	}
+
+public:
+	~DespotifyInputStream() {
+		despotify_free_track(track);
+	}
+
+	static InputStream *Open(const char *url, Mutex &mutex, Cond &cond,
+				 Error &error);
+
+	bool IsEOF() const {
+		return eof;
+	}
+
+	size_t Read(void *ptr, size_t size, Error &error);
+
+	Tag *ReadTag() {
+		if (tag.IsEmpty())
+			return nullptr;
+
+		Tag *result = new Tag(std::move(tag));
+		tag.Clear();
+		return result;
+	}
+
+	void Callback(int sig);
+
+private:
+	void FillBuffer();
+};
+
+inline void
+DespotifyInputStream::FillBuffer()
+{
+	/* Wait until there is data */
+	while (1) {
+		int rc = despotify_get_pcm(session, &pcm);
+
+		if (rc == 0 && pcm.len) {
+			len_available = pcm.len;
+			break;
+		}
+
+		if (eof == true)
+			break;
+
+		if (rc < 0) {
+			LogDebug(despotify_domain, "despotify_get_pcm error");
+			eof = true;
+			break;
+		}
+
+		/* Wait a while until next iteration */
+		usleep(50 * 1000);
+	}
+}
+
+inline void
+DespotifyInputStream::Callback(int sig)
+{
+	switch (sig) {
+	case DESPOTIFY_NEW_TRACK:
+		break;
+
+	case DESPOTIFY_TIME_TELL:
+		break;
+
+	case DESPOTIFY_TRACK_PLAY_ERROR:
+		LogWarning(despotify_domain, "Track play error");
+		eof = true;
+		len_available = 0;
+		break;
+
+	case DESPOTIFY_END_OF_PLAYLIST:
+		eof = true;
+		LogDebug(despotify_domain, "End of playlist");
+		break;
+	}
+}
+
+static void callback(gcc_unused struct despotify_session* ds,
+		     int sig, gcc_unused void* data, void* callback_data)
+{
+	DespotifyInputStream *ctx = (DespotifyInputStream *)callback_data;
+
+	ctx->Callback(sig);
+}
+
+inline InputStream *
+DespotifyInputStream::Open(const char *url,
+			   Mutex &mutex, Cond &cond,
+			   gcc_unused Error &error)
+{
+	if (!StringStartsWith(url, "spt://"))
+		return nullptr;
+
+	despotify_session *session = mpd_despotify_get_session();
+	if (session == nullptr)
+		return nullptr;
+
+	ds_link *ds_link = despotify_link_from_uri(url + 6);
+	if (!ds_link) {
+		FormatDebug(despotify_domain, "Can't find %s", url);
+		return nullptr;
+	}
+	if (ds_link->type != LINK_TYPE_TRACK) {
+		despotify_free_link(ds_link);
+		return nullptr;
+	}
+
+	ds_track *track = despotify_link_get_track(session, ds_link);
+	despotify_free_link(ds_link);
+	if (!track)
+		return nullptr;
+
+	DespotifyInputStream *ctx =
+		new DespotifyInputStream(url, mutex, cond,
+					 session, track);
+
+	if (!mpd_despotify_register_callback(callback, ctx)) {
+		delete ctx;
+		return nullptr;
+	}
+
+	if (despotify_play(ctx->session, ctx->track, false) == false) {
+		mpd_despotify_unregister_callback(callback);
+		delete ctx;
+		return nullptr;
+	}
+
+	return &ctx->base;
+}
+
+static InputStream *
+input_despotify_open(const char *url, Mutex &mutex, Cond &cond, Error &error)
+{
+	return DespotifyInputStream::Open(url, mutex, cond, error);
+}
+
+inline size_t
+DespotifyInputStream::Read(void *ptr, size_t size, gcc_unused Error &error)
+{
+	if (len_available == 0)
+		FillBuffer();
+
+	size_t to_cpy = std::min(size, len_available);
+	memcpy(ptr, pcm.buf, to_cpy);
+	len_available -= to_cpy;
+
+	base.offset += to_cpy;
+
+	return to_cpy;
+}
+
+static size_t
+input_despotify_read(InputStream *is, void *ptr, size_t size, Error &error)
+{
+	DespotifyInputStream *ctx = (DespotifyInputStream *)is;
+	return ctx->Read(ptr, size, error);
+}
+
+static void
+input_despotify_close(InputStream *is)
+{
+	DespotifyInputStream *ctx = (DespotifyInputStream *)is;
+
+	mpd_despotify_unregister_callback(callback);
+	delete ctx;
+}
+
+static bool
+input_despotify_eof(InputStream *is)
+{
+	DespotifyInputStream *ctx = (DespotifyInputStream *)is;
+
+	return ctx->IsEOF();
+}
+
+static Tag *
+input_despotify_tag(InputStream *is)
+{
+	DespotifyInputStream *ctx = (DespotifyInputStream *)is;
+
+	return ctx->ReadTag();
+}
+
+const InputPlugin input_plugin_despotify = {
+	"despotify",
+	nullptr,
+	nullptr,
+	input_despotify_open,
+	input_despotify_close,
+	nullptr,
+	nullptr,
+	input_despotify_tag,
+	nullptr,
+	input_despotify_read,
+	input_despotify_eof,
+	nullptr,
+};