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Diffstat (limited to 'src/AudioParser.cxx')
| -rw-r--r-- | src/AudioParser.cxx | 222 |
1 files changed, 222 insertions, 0 deletions
diff --git a/src/AudioParser.cxx b/src/AudioParser.cxx new file mode 100644 index 000000000..9178c3e1a --- /dev/null +++ b/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; +} |