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/*
* 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 "audio_parser.h"
#include "audio_format.h"
#include "audio_check.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;
}
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) {
sample_format = SAMPLE_FORMAT_S24;
endptr += 2;
} else
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 (!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 (!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);
return true;
}
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