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Diffstat (limited to '')
| -rw-r--r-- | src/AudioParser.cxx | 213 |
1 files changed, 213 insertions, 0 deletions
diff --git a/src/AudioParser.cxx b/src/AudioParser.cxx new file mode 100644 index 000000000..db6d1d8e8 --- /dev/null +++ b/src/AudioParser.cxx @@ -0,0 +1,213 @@ +/* + * 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 "AudioFormat.hxx" +#include "CheckAudioFormat.hxx" +#include "util/Error.hxx" +#include "gcc.h" + +#include <assert.h> +#include <string.h> +#include <stdlib.h> + +static bool +parse_sample_rate(const char *src, bool mask, uint32_t *sample_rate_r, + const char **endptr_r, Error &error) +{ + 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) { + error.Set(audio_format_domain, + "Failed to parse the sample rate"); + return false; + } else if (!audio_check_sample_rate(value, error)) + return false; + + *sample_rate_r = value; + *endptr_r = endptr; + return true; +} + +static bool +parse_sample_format(const char *src, bool mask, + SampleFormat *sample_format_r, + const char **endptr_r, Error &error) +{ + unsigned long value; + char *endptr; + SampleFormat sample_format; + + if (mask && *src == '*') { + *sample_format_r = SampleFormat::UNDEFINED; + *endptr_r = src + 1; + return true; + } + + if (*src == 'f') { + *sample_format_r = SampleFormat::FLOAT; + *endptr_r = src + 1; + return true; + } + + if (memcmp(src, "dsd", 3) == 0) { + *sample_format_r = SampleFormat::DSD; + *endptr_r = src + 3; + return true; + } + + value = strtoul(src, &endptr, 10); + if (endptr == src) { + error.Set(audio_format_domain, + "Failed to parse the sample format"); + return false; + } + + switch (value) { + case 8: + sample_format = SampleFormat::S8; + break; + + case 16: + sample_format = SampleFormat::S16; + break; + + case 24: + if (memcmp(endptr, "_3", 2) == 0) + /* for backwards compatibility */ + endptr += 2; + + sample_format = SampleFormat::S24_P32; + break; + + case 32: + sample_format = SampleFormat::S32; + break; + + default: + error.Format(audio_format_domain, + "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, Error &error) +{ + 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) { + error.Set(audio_format_domain, + "Failed to parse the channel count"); + return false; + } else if (!audio_check_channel_count(value, error)) + return false; + + *channels_r = value; + *endptr_r = endptr; + return true; +} + +bool +audio_format_parse(AudioFormat &dest, const char *src, + bool mask, Error &error) +{ + uint32_t rate; + SampleFormat sample_format; + uint8_t channels; + + dest.Clear(); + + /* 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)) + return false; + + if (*src++ != ':') { + error.Set(audio_format_domain, "Sample format missing"); + return false; + } + + /* parse sample format */ + +#if GCC_CHECK_VERSION(4,7) + /* workaround -Wmaybe-uninitialized false positive */ + sample_format = SampleFormat::UNDEFINED; +#endif + + if (!parse_sample_format(src, mask, &sample_format, &src, error)) + return false; + + if (*src++ != ':') { + error.Set(audio_format_domain, "Channel count missing"); + return false; + } + + /* parse channel count */ + + if (!parse_channel_count(src, mask, &channels, &src, error)) + return false; + + if (*src != 0) { + error.Format(audio_format_domain, + "Extra data after channel count: %s", src); + return false; + } + + dest = AudioFormat(rate, sample_format, channels); + assert(mask + ? dest.IsMaskValid() + : dest.IsValid()); + + return true; +} |