audio_{parser,config}: convert to C++

src/AudioParser.cxx

@@ -0,0 +1,222 @@
+/*
+ * Copyright (C) 2003-2011 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.
+ */
+
+/*
+ * Parser functions for audio related objects.
+ *
+ */
+
+#include "config.h"
+#include "AudioParser.hxx"
+#include "audio_format.h"
+#include "audio_check.h"
+#include "gcc.h"
+
+#include <assert.h>
+#include <string.h>
+#include <stdlib.h>
+
+/**
+ * The GLib quark used for errors reported by this library.
+ */
+static inline GQuark
+audio_parser_quark(void)
+{
+	return g_quark_from_static_string("audio_parser");
+}
+
+static bool
+parse_sample_rate(const char *src, bool mask, uint32_t *sample_rate_r,
+		  const char **endptr_r, GError **error_r)
+{
+	unsigned long value;
+	char *endptr;
+
+	if (mask && *src == '*') {
+		*sample_rate_r = 0;
+		*endptr_r = src + 1;
+		return true;
+	}
+
+	value = strtoul(src, &endptr, 10);
+	if (endptr == src) {
+		g_set_error(error_r, audio_parser_quark(), 0,
+			    "Failed to parse the sample rate");
+		return false;
+	} else if (!audio_check_sample_rate(value, error_r))
+		return false;
+
+	*sample_rate_r = value;
+	*endptr_r = endptr;
+	return true;
+}
+
+static bool
+parse_sample_format(const char *src, bool mask,
+		    enum sample_format *sample_format_r,
+		    const char **endptr_r, GError **error_r)
+{
+	unsigned long value;
+	char *endptr;
+	enum sample_format sample_format;
+
+	if (mask && *src == '*') {
+		*sample_format_r = SAMPLE_FORMAT_UNDEFINED;
+		*endptr_r = src + 1;
+		return true;
+	}
+
+	if (*src == 'f') {
+		*sample_format_r = SAMPLE_FORMAT_FLOAT;
+		*endptr_r = src + 1;
+		return true;
+	}
+
+	if (memcmp(src, "dsd", 3) == 0) {
+		*sample_format_r = SAMPLE_FORMAT_DSD;
+		*endptr_r = src + 3;
+		return true;
+	}
+
+	value = strtoul(src, &endptr, 10);
+	if (endptr == src) {
+		g_set_error(error_r, audio_parser_quark(), 0,
+			    "Failed to parse the sample format");
+		return false;
+	}
+
+	switch (value) {
+	case 8:
+		sample_format = SAMPLE_FORMAT_S8;
+		break;
+
+	case 16:
+		sample_format = SAMPLE_FORMAT_S16;
+		break;
+
+	case 24:
+		if (memcmp(endptr, "_3", 2) == 0)
+			/* for backwards compatibility */
+			endptr += 2;
+
+		sample_format = SAMPLE_FORMAT_S24_P32;
+		break;
+
+	case 32:
+		sample_format = SAMPLE_FORMAT_S32;
+		break;
+
+	default:
+		g_set_error(error_r, audio_parser_quark(), 0,
+			    "Invalid sample format: %lu", value);
+		return false;
+	}
+
+	assert(audio_valid_sample_format(sample_format));
+
+	*sample_format_r = sample_format;
+	*endptr_r = endptr;
+	return true;
+}
+
+static bool
+parse_channel_count(const char *src, bool mask, uint8_t *channels_r,
+		    const char **endptr_r, GError **error_r)
+{
+	unsigned long value;
+	char *endptr;
+
+	if (mask && *src == '*') {
+		*channels_r = 0;
+		*endptr_r = src + 1;
+		return true;
+	}
+
+	value = strtoul(src, &endptr, 10);
+	if (endptr == src) {
+		g_set_error(error_r, audio_parser_quark(), 0,
+			    "Failed to parse the channel count");
+		return false;
+	} else if (!audio_check_channel_count(value, error_r))
+		return false;
+
+	*channels_r = value;
+	*endptr_r = endptr;
+	return true;
+}
+
+bool
+audio_format_parse(struct audio_format *dest, const char *src,
+		   bool mask, GError **error_r)
+{
+	uint32_t rate;
+	enum sample_format sample_format;
+	uint8_t channels;
+
+	audio_format_clear(dest);
+
+	/* parse sample rate */
+
+#if GCC_CHECK_VERSION(4,7)
+	/* workaround -Wmaybe-uninitialized false positive */
+	rate = 0;
+#endif
+
+	if (!parse_sample_rate(src, mask, &rate, &src, error_r))
+		return false;
+
+	if (*src++ != ':') {
+		g_set_error(error_r, audio_parser_quark(), 0,
+			    "Sample format missing");
+		return false;
+	}
+
+	/* parse sample format */
+
+#if GCC_CHECK_VERSION(4,7)
+	/* workaround -Wmaybe-uninitialized false positive */
+	sample_format = SAMPLE_FORMAT_UNDEFINED;
+#endif
+
+	if (!parse_sample_format(src, mask, &sample_format, &src, error_r))
+		return false;
+
+	if (*src++ != ':') {
+		g_set_error(error_r, audio_parser_quark(), 0,
+			    "Channel count missing");
+		return false;
+	}
+
+	/* parse channel count */
+
+	if (!parse_channel_count(src, mask, &channels, &src, error_r))
+		return false;
+
+	if (*src != 0) {
+		g_set_error(error_r, audio_parser_quark(), 0,
+			    "Extra data after channel count: %s", src);
+		return false;
+	}
+
+	audio_format_init(dest, rate, sample_format, channels);
+	assert(mask ? audio_format_mask_valid(dest)
+	       : audio_format_valid(dest));
+
+	return true;
+}