decoder/pcm: convert to C++

src/decoder/PcmDecoderPlugin.cxx

@@ -0,0 +1,118 @@
+/*
+ * 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 "decoder/PcmDecoderPlugin.hxx"
+#include "decoder_api.h"
+
+extern "C" {
+#include "util/byte_reverse.h"
+}
+
+#include <glib.h>
+#include <unistd.h>
+#include <stdio.h> /* for SEEK_SET */
+
+#undef G_LOG_DOMAIN
+#define G_LOG_DOMAIN "pcm"
+
+static void
+pcm_stream_decode(struct decoder *decoder, struct input_stream *is)
+{
+	static constexpr struct audio_format audio_format = {
+		44100,
+		SAMPLE_FORMAT_S16,
+		2,
+	};
+
+	const char *const mime = input_stream_get_mime_type(is);
+	const bool reverse_endian = mime != nullptr &&
+		strcmp(mime, "audio/x-mpd-cdda-pcm-reverse") == 0;
+
+	GError *error = nullptr;
+	enum decoder_command cmd;
+
+	double time_to_size = audio_format_time_to_size(&audio_format);
+
+	float total_time = -1;
+	const goffset size = input_stream_get_size(is);
+	if (size >= 0)
+		total_time = size / time_to_size;
+
+	decoder_initialized(decoder, &audio_format,
+			    input_stream_is_seekable(is), total_time);
+
+	do {
+		char buffer[4096];
+
+		size_t nbytes = decoder_read(decoder, is,
+					     buffer, sizeof(buffer));
+
+		if (nbytes == 0 && input_stream_lock_eof(is))
+			break;
+
+		if (reverse_endian)
+			/* make sure we deliver samples in host byte order */
+			reverse_bytes_16((uint16_t *)buffer,
+					 (uint16_t *)buffer,
+					 (uint16_t *)(buffer + nbytes));
+
+		cmd = nbytes > 0
+			? decoder_data(decoder, is,
+				       buffer, nbytes, 0)
+			: decoder_get_command(decoder);
+		if (cmd == DECODE_COMMAND_SEEK) {
+			goffset offset = (goffset)(time_to_size *
+						   decoder_seek_where(decoder));
+			if (input_stream_lock_seek(is, offset, SEEK_SET,
+						   &error)) {
+				decoder_command_finished(decoder);
+			} else {
+				g_warning("seeking failed: %s", error->message);
+				g_error_free(error);
+				decoder_seek_error(decoder);
+			}
+
+			cmd = DECODE_COMMAND_NONE;
+		}
+	} while (cmd == DECODE_COMMAND_NONE);
+}
+
+static const char *const pcm_mime_types[] = {
+	/* for streams obtained by the cdio_paranoia input plugin */
+	"audio/x-mpd-cdda-pcm",
+
+	/* same as above, but with reverse byte order */
+	"audio/x-mpd-cdda-pcm-reverse",
+
+	nullptr
+};
+
+const struct decoder_plugin pcm_decoder_plugin = {
+	"pcm",
+	nullptr,
+	nullptr,
+	pcm_stream_decode,
+	nullptr,
+	nullptr,
+	nullptr,
+	nullptr,
+	nullptr,
+	pcm_mime_types,
+};