166 lines
3.6 KiB
C++
166 lines
3.6 KiB
C++
/*
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* Copyright 2003-2017 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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/*
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* Parser functions for audio related objects.
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*
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*/
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#include "config.h"
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#include "AudioParser.hxx"
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#include "AudioFormat.hxx"
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#include "util/RuntimeError.hxx"
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#include <assert.h>
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#include <string.h>
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#include <stdlib.h>
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static uint32_t
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ParseSampleRate(const char *src, bool mask, const char **endptr_r)
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{
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unsigned long value;
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char *endptr;
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if (mask && *src == '*') {
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*endptr_r = src + 1;
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return 0;
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}
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value = strtoul(src, &endptr, 10);
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if (endptr == src) {
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throw std::runtime_error("Failed to parse the sample rate");
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} else if (!audio_valid_sample_rate(value))
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throw FormatRuntimeError("Invalid sample rate: %lu",
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value);
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*endptr_r = endptr;
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return value;
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}
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static SampleFormat
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ParseSampleFormat(const char *src, bool mask, const char **endptr_r)
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{
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unsigned long value;
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char *endptr;
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SampleFormat sample_format;
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if (mask && *src == '*') {
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*endptr_r = src + 1;
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return SampleFormat::UNDEFINED;
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}
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if (*src == 'f') {
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*endptr_r = src + 1;
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return SampleFormat::FLOAT;
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}
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if (memcmp(src, "dsd", 3) == 0) {
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*endptr_r = src + 3;
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return SampleFormat::DSD;
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}
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value = strtoul(src, &endptr, 10);
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if (endptr == src)
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throw std::runtime_error("Failed to parse the sample format");
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switch (value) {
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case 8:
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sample_format = SampleFormat::S8;
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break;
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case 16:
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sample_format = SampleFormat::S16;
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break;
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case 24:
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if (memcmp(endptr, "_3", 2) == 0)
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/* for backwards compatibility */
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endptr += 2;
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sample_format = SampleFormat::S24_P32;
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break;
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case 32:
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sample_format = SampleFormat::S32;
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break;
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default:
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throw FormatRuntimeError("Invalid sample format: %lu", value);
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}
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assert(audio_valid_sample_format(sample_format));
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*endptr_r = endptr;
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return sample_format;
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}
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static uint8_t
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ParseChannelCount(const char *src, bool mask, const char **endptr_r)
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{
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unsigned long value;
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char *endptr;
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if (mask && *src == '*') {
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*endptr_r = src + 1;
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return 0;
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}
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value = strtoul(src, &endptr, 10);
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if (endptr == src)
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throw std::runtime_error("Failed to parse the channel count");
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else if (!audio_valid_channel_count(value))
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throw FormatRuntimeError("Invalid channel count: %u", value);
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*endptr_r = endptr;
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return value;
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}
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AudioFormat
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ParseAudioFormat(const char *src, bool mask)
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{
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AudioFormat dest;
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dest.Clear();
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/* parse sample rate */
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dest.sample_rate = ParseSampleRate(src, mask, &src);
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if (*src++ != ':')
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throw std::runtime_error("Sample format missing");
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/* parse sample format */
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dest.format = ParseSampleFormat(src, mask, &src);
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if (*src++ != ':')
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throw std::runtime_error("Channel count missing");
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/* parse channel count */
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dest.channels = ParseChannelCount(src, mask, &src);
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if (*src != 0)
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throw FormatRuntimeError("Extra data after channel count: %s", src);
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assert(mask
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? dest.IsMaskValid()
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: dest.IsValid());
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return dest;
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}
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