output/pipe: convert to C++

src/output/PipeOutputPlugin.cxx

@@ -0,0 +1,152 @@
+/*
+ * Copyright (C) 2003-2013 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 "PipeOutputPlugin.hxx"
+#include "output_api.h"
+
+#include <stdio.h>
+#include <errno.h>
+
+struct PipeOutput {
+	struct audio_output base;
+
+	char *cmd;
+	FILE *fh;
+
+	bool Initialize(const config_param *param, GError **error_r) {
+		return ao_base_init(&base, &pipe_output_plugin, param,
+				    error_r);
+	}
+
+	void Deinitialize() {
+		ao_base_finish(&base);
+	}
+
+	bool Configure(const config_param *param, GError **error_r);
+};
+
+/**
+ * The quark used for GError.domain.
+ */
+static inline GQuark
+pipe_output_quark(void)
+{
+	return g_quark_from_static_string("pipe_output");
+}
+
+inline bool
+PipeOutput::Configure(const config_param *param, GError **error_r)
+{
+	cmd = config_dup_block_string(param, "command", nullptr);
+	if (cmd == nullptr) {
+		g_set_error(error_r, pipe_output_quark(), 0,
+			    "No \"command\" parameter specified");
+		return false;
+	}
+
+	return true;
+}
+
+static struct audio_output *
+pipe_output_init(const config_param *param, GError **error_r)
+{
+	PipeOutput *pd = new PipeOutput();
+
+	if (!pd->Initialize(param, error_r)) {
+		delete pd;
+		return nullptr;
+	}
+
+	if (!pd->Configure(param, error_r)) {
+		pd->Deinitialize();
+		delete pd;
+		return nullptr;
+	}
+
+	return &pd->base;
+}
+
+static void
+pipe_output_finish(struct audio_output *ao)
+{
+	PipeOutput *pd = (PipeOutput *)ao;
+
+	g_free(pd->cmd);
+	pd->Deinitialize();
+	delete pd;
+}
+
+static bool
+pipe_output_open(struct audio_output *ao,
+		 G_GNUC_UNUSED struct audio_format *audio_format,
+		 G_GNUC_UNUSED GError **error)
+{
+	PipeOutput *pd = (PipeOutput *)ao;
+
+	pd->fh = popen(pd->cmd, "w");
+	if (pd->fh == nullptr) {
+		g_set_error(error, pipe_output_quark(), errno,
+			    "Error opening pipe \"%s\": %s",
+			    pd->cmd, g_strerror(errno));
+		return false;
+	}
+
+	return true;
+}
+
+static void
+pipe_output_close(struct audio_output *ao)
+{
+	PipeOutput *pd = (PipeOutput *)ao;
+
+	pclose(pd->fh);
+}
+
+static size_t
+pipe_output_play(struct audio_output *ao, const void *chunk, size_t size, GError **error)
+{
+	PipeOutput *pd = (PipeOutput *)ao;
+	size_t ret;
+
+	ret = fwrite(chunk, 1, size, pd->fh);
+	if (ret == 0)
+		g_set_error(error, pipe_output_quark(), errno,
+			    "Write error on pipe: %s", g_strerror(errno));
+
+	return ret;
+}
+
+const struct audio_output_plugin pipe_output_plugin = {
+	"pipe",
+	nullptr,
+	pipe_output_init,
+	pipe_output_finish,
+	nullptr,
+	nullptr,
+	pipe_output_open,
+	pipe_output_close,
+	nullptr,
+	nullptr,
+	pipe_output_play,
+	nullptr,
+	nullptr,
+	nullptr,
+	nullptr,
+};