input: Add despotify input plugin

For Spotify tracks. Uses a spt URI, so with mpc you can play tracks
with e.g.,

  mpc add spt://spotify:track:5qENVY0YEdZ7fiuOax70x1
  mpc play

Uses the pcm_decoder_plugin for the output

2 files changed, 251 insertions, 0 deletions

diff --git a/src/input/despotify_input_plugin.c b/src/input/despotify_input_plugin.c
new file mode 100644
index 00000000..b63663c5
--- /dev/null
+++ b/src/input/despotify_input_plugin.c
@@ -0,0 +1,226 @@
+/*
+ * Copyright (C) 2011 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 "input/despotify_input_plugin.h"
+#include "input_plugin.h"
+#include "tag.h"
+#include "despotify_utils.h"
+
+#include <glib.h>
+
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+#include <despotify.h>
+
+#include <stdio.h>
+
+struct input_despotify {
+	struct input_stream base;
+
+	struct despotify_session *session;
+	struct ds_track *track;
+	struct tag *tag;
+	struct ds_pcm_data pcm;
+	size_t len_available;
+	bool eof;
+};
+
+
+static void
+refill_buffer(struct input_despotify *ctx)
+{
+	/* Wait until there is data */
+	while (1) {
+		int rc = despotify_get_pcm(ctx->session, &ctx->pcm);
+
+		if (rc == 0 && ctx->pcm.len) {
+			ctx->len_available = ctx->pcm.len;
+			break;
+		}
+		if (ctx->eof == true)
+			break;
+
+		if (rc < 0) {
+			g_debug("despotify_get_pcm error\n");
+			ctx->eof = true;
+			break;
+		}
+
+		/* Wait a while until next iteration */
+		usleep(50 * 1000);
+	}
+}
+
+static void callback(G_GNUC_UNUSED struct despotify_session* ds,
+		int sig, G_GNUC_UNUSED void* data, void* callback_data)
+{
+	struct input_despotify *ctx = (struct input_despotify *)callback_data;
+
+	switch (sig) {
+	case DESPOTIFY_NEW_TRACK:
+		break;
+
+	case DESPOTIFY_TIME_TELL:
+		break;
+
+	case DESPOTIFY_TRACK_PLAY_ERROR:
+		g_debug("Track play error\n");
+		ctx->eof = true;
+		ctx->len_available = 0;
+		break;
+
+	case DESPOTIFY_END_OF_PLAYLIST:
+		ctx->eof = true;
+		g_debug("End of playlist: %d\n", ctx->eof);
+		break;
+	}
+}
+
+
+static struct input_stream *
+input_despotify_open(const char *url, G_GNUC_UNUSED GError **error_r)
+{
+	struct input_despotify *ctx;
+	struct despotify_session *session;
+	struct ds_link *ds_link;
+	struct ds_track *track;
+
+	if (!g_str_has_prefix(url, "spt://"))
+		return NULL;
+
+	session = mpd_despotify_get_session();
+	if (!session)
+		return NULL;
+
+	ds_link = despotify_link_from_uri(url + 6);
+	if (!ds_link) {
+		g_debug("Can't find %s\n", url);
+		return NULL;
+	}
+	if (ds_link->type != LINK_TYPE_TRACK) {
+		despotify_free_link(ds_link);
+		return NULL;
+	}
+
+	ctx = g_new(struct input_despotify, 1);
+	memset(ctx, 0, sizeof(*ctx));
+
+	track = despotify_link_get_track(session, ds_link);
+	despotify_free_link(ds_link);
+	if (!track) {
+		g_free(ctx);
+		return NULL;
+	}
+
+	input_stream_init(&ctx->base, &input_plugin_despotify, url);
+	ctx->session = session;
+	ctx->track = track;
+	ctx->tag = mpd_despotify_tag_from_track(track);
+	ctx->eof = false;
+	/* Despotify outputs pcm data */
+	ctx->base.mime = g_strdup("audio/x-mpd-cdda-pcm");
+	ctx->base.ready = true;
+
+	if (!mpd_despotify_register_callback(callback, ctx)) {
+		despotify_free_link(ds_link);
+
+		return NULL;
+	}
+
+	if (despotify_play(ctx->session, ctx->track, false) == false) {
+		despotify_free_track(ctx->track);
+		g_free(ctx);
+		return NULL;
+	}
+
+	return &ctx->base;
+}
+
+static size_t
+input_despotify_read(struct input_stream *is, void *ptr, size_t size,
+	       G_GNUC_UNUSED GError **error_r)
+{
+	struct input_despotify *ctx = (struct input_despotify *)is;
+	size_t to_cpy = size;
+
+	if (ctx->len_available == 0)
+		refill_buffer(ctx);
+
+	if (ctx->len_available < size)
+		to_cpy = ctx->len_available;
+	memcpy(ptr, ctx->pcm.buf, to_cpy);
+	ctx->len_available -= to_cpy;
+
+	is->offset += to_cpy;
+
+	return to_cpy;
+}
+
+static void
+input_despotify_close(struct input_stream *is)
+{
+	struct input_despotify *ctx = (struct input_despotify *)is;
+
+	if (ctx->tag != NULL)
+		tag_free(ctx->tag);
+
+	mpd_despotify_unregister_callback(callback);
+	despotify_free_track(ctx->track);
+	input_stream_deinit(&ctx->base);
+	g_free(ctx);
+}
+
+static bool
+input_despotify_eof(struct input_stream *is)
+{
+	struct input_despotify *ctx = (struct input_despotify *)is;
+
+	return ctx->eof;
+}
+
+static bool
+input_despotify_seek(G_GNUC_UNUSED struct input_stream *is,
+	       G_GNUC_UNUSED goffset offset, G_GNUC_UNUSED int whence,
+	       G_GNUC_UNUSED GError **error_r)
+{
+	return false;
+}
+
+static struct tag *
+input_despotify_tag(struct input_stream *is)
+{
+	struct input_despotify *ctx = (struct input_despotify *)is;
+	struct tag *tag = ctx->tag;
+
+	ctx->tag = NULL;
+
+	return tag;
+}
+
+const struct input_plugin input_plugin_despotify = {
+	.name = "spt",
+	.open = input_despotify_open,
+	.close = input_despotify_close,
+	.read = input_despotify_read,
+	.eof = input_despotify_eof,
+	.seek = input_despotify_seek,
+	.tag = input_despotify_tag,
+};
diff --git a/src/input/despotify_input_plugin.h b/src/input/despotify_input_plugin.h
new file mode 100644
index 00000000..4c070d88
--- /dev/null
+++ b/src/input/despotify_input_plugin.h
@@ -0,0 +1,25 @@
+/*
+ * Copyright (C) 2011 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.
+ */
+
+#ifndef INPUT_DESPOTIFY_H
+#define INPUT_DESPOTIFY_H
+
+extern const struct input_plugin input_plugin_despotify;
+
+#endif