/* * Copyright (C) 2003-2010 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; }