From cbdd042adc8131c4ef890195447760d229eb1f87 Mon Sep 17 00:00:00 2001 From: Max Kellermann Date: Tue, 2 Oct 2012 10:56:44 +0200 Subject: decoder/flac: use C++ compiler --- src/decoder/FLACMetaData.cxx | 322 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 322 insertions(+) create mode 100644 src/decoder/FLACMetaData.cxx (limited to 'src/decoder/FLACMetaData.cxx') diff --git a/src/decoder/FLACMetaData.cxx b/src/decoder/FLACMetaData.cxx new file mode 100644 index 000000000..d6ddb6cb0 --- /dev/null +++ b/src/decoder/FLACMetaData.cxx @@ -0,0 +1,322 @@ +/* + * Copyright (C) 2003-2012 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. + */ + +#include "config.h" +#include "FLACMetaData.hxx" + +extern "C" { +#include "XiphTags.h" +#include "replay_gain_info.h" +#include "tag.h" +} + +#include "tag_handler.h" +#include "tag_table.h" + +#include + +#include +#include +#include + +static bool +flac_find_float_comment(const FLAC__StreamMetadata *block, + const char *cmnt, float *fl) +{ + int offset; + size_t pos; + int len; + unsigned char tmp, *p; + + offset = FLAC__metadata_object_vorbiscomment_find_entry_from(block, 0, + cmnt); + if (offset < 0) + return false; + + pos = strlen(cmnt) + 1; /* 1 is for '=' */ + len = block->data.vorbis_comment.comments[offset].length - pos; + if (len <= 0) + return false; + + p = &block->data.vorbis_comment.comments[offset].entry[pos]; + tmp = p[len]; + p[len] = '\0'; + *fl = (float)atof((char *)p); + p[len] = tmp; + + return true; +} + +bool +flac_parse_replay_gain(struct replay_gain_info *rgi, + const FLAC__StreamMetadata *block) +{ + bool found = false; + + replay_gain_info_init(rgi); + + if (flac_find_float_comment(block, "replaygain_album_gain", + &rgi->tuples[REPLAY_GAIN_ALBUM].gain)) + found = true; + if (flac_find_float_comment(block, "replaygain_album_peak", + &rgi->tuples[REPLAY_GAIN_ALBUM].peak)) + found = true; + if (flac_find_float_comment(block, "replaygain_track_gain", + &rgi->tuples[REPLAY_GAIN_TRACK].gain)) + found = true; + if (flac_find_float_comment(block, "replaygain_track_peak", + &rgi->tuples[REPLAY_GAIN_TRACK].peak)) + found = true; + + return found; +} + +static bool +flac_find_string_comment(const FLAC__StreamMetadata *block, + const char *cmnt, char **str) +{ + int offset; + size_t pos; + int len; + const unsigned char *p; + + *str = nullptr; + offset = FLAC__metadata_object_vorbiscomment_find_entry_from(block, 0, + cmnt); + if (offset < 0) + return false; + + pos = strlen(cmnt) + 1; /* 1 is for '=' */ + len = block->data.vorbis_comment.comments[offset].length - pos; + if (len <= 0) + return false; + + p = &block->data.vorbis_comment.comments[offset].entry[pos]; + *str = g_strndup((const char *)p, len); + + return true; +} + +bool +flac_parse_mixramp(char **mixramp_start, char **mixramp_end, + const FLAC__StreamMetadata *block) +{ + bool found = false; + + if (flac_find_string_comment(block, "mixramp_start", mixramp_start)) + found = true; + if (flac_find_string_comment(block, "mixramp_end", mixramp_end)) + found = true; + + return found; +} + +/** + * Checks if the specified name matches the entry's name, and if yes, + * returns the comment value (not null-temrinated). + */ +static const char * +flac_comment_value(const FLAC__StreamMetadata_VorbisComment_Entry *entry, + const char *name, const char *char_tnum, size_t *length_r) +{ + size_t name_length = strlen(name); + size_t char_tnum_length = 0; + const char *comment = (const char*)entry->entry; + + if (entry->length <= name_length || + g_ascii_strncasecmp(comment, name, name_length) != 0) + return nullptr; + + if (char_tnum != nullptr) { + char_tnum_length = strlen(char_tnum); + if (entry->length > name_length + char_tnum_length + 2 && + comment[name_length] == '[' && + g_ascii_strncasecmp(comment + name_length + 1, + char_tnum, char_tnum_length) == 0 && + comment[name_length + char_tnum_length + 1] == ']') + name_length = name_length + char_tnum_length + 2; + else if (entry->length > name_length + char_tnum_length && + g_ascii_strncasecmp(comment + name_length, + char_tnum, char_tnum_length) == 0) + name_length = name_length + char_tnum_length; + } + + if (comment[name_length] == '=') { + *length_r = entry->length - name_length - 1; + return comment + name_length + 1; + } + + return nullptr; +} + +/** + * Check if the comment's name equals the passed name, and if so, copy + * the comment value into the tag. + */ +static bool +flac_copy_comment(const FLAC__StreamMetadata_VorbisComment_Entry *entry, + const char *name, enum tag_type tag_type, + const char *char_tnum, + const struct tag_handler *handler, void *handler_ctx) +{ + const char *value; + size_t value_length; + + value = flac_comment_value(entry, name, char_tnum, &value_length); + if (value != nullptr) { + char *p = g_strndup(value, value_length); + tag_handler_invoke_tag(handler, handler_ctx, tag_type, p); + g_free(p); + return true; + } + + return false; +} + +static void +flac_scan_comment(const char *char_tnum, + const FLAC__StreamMetadata_VorbisComment_Entry *entry, + const struct tag_handler *handler, void *handler_ctx) +{ + if (handler->pair != nullptr) { + char *name = g_strdup((const char*)entry->entry); + char *value = strchr(name, '='); + + if (value != nullptr && value > name) { + *value++ = 0; + tag_handler_invoke_pair(handler, handler_ctx, + name, value); + } + + g_free(name); + } + + for (const struct tag_table *i = xiph_tags; i->name != nullptr; ++i) + if (flac_copy_comment(entry, i->name, i->type, char_tnum, + handler, handler_ctx)) + return; + + for (unsigned i = 0; i < TAG_NUM_OF_ITEM_TYPES; ++i) + if (flac_copy_comment(entry, + tag_item_names[i], (enum tag_type)i, + char_tnum, + handler, handler_ctx)) + return; +} + +static void +flac_scan_comments(const char *char_tnum, + const FLAC__StreamMetadata_VorbisComment *comment, + const struct tag_handler *handler, void *handler_ctx) +{ + for (unsigned i = 0; i < comment->num_comments; ++i) + flac_scan_comment(char_tnum, &comment->comments[i], + handler, handler_ctx); +} + +void +flac_scan_metadata(const char *track, + const FLAC__StreamMetadata *block, + const struct tag_handler *handler, void *handler_ctx) +{ + switch (block->type) { + case FLAC__METADATA_TYPE_VORBIS_COMMENT: + flac_scan_comments(track, &block->data.vorbis_comment, + handler, handler_ctx); + break; + + case FLAC__METADATA_TYPE_STREAMINFO: + if (block->data.stream_info.sample_rate > 0) + tag_handler_invoke_duration(handler, handler_ctx, + flac_duration(&block->data.stream_info)); + break; + + default: + break; + } +} + +void +flac_vorbis_comments_to_tag(struct tag *tag, const char *char_tnum, + const FLAC__StreamMetadata_VorbisComment *comment) +{ + flac_scan_comments(char_tnum, comment, + &add_tag_handler, tag); +} + +bool +flac_scan_file2(const char *file, const char *char_tnum, + const struct tag_handler *handler, void *handler_ctx) +{ + FLAC__Metadata_SimpleIterator *it; + FLAC__StreamMetadata *block = nullptr; + + it = FLAC__metadata_simple_iterator_new(); + if (!FLAC__metadata_simple_iterator_init(it, file, 1, 0)) { + const char *err; + FLAC_API FLAC__Metadata_SimpleIteratorStatus s; + + s = FLAC__metadata_simple_iterator_status(it); + + switch (s) { /* slightly more human-friendly messages: */ + case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT: + err = "illegal input"; + break; + case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ERROR_OPENING_FILE: + err = "error opening file"; + break; + case FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_A_FLAC_FILE: + err = "not a FLAC file"; + break; + default: + err = FLAC__Metadata_SimpleIteratorStatusString[s]; + } + g_debug("Reading '%s' metadata gave the following error: %s\n", + file, err); + FLAC__metadata_simple_iterator_delete(it); + return false; + } + + do { + block = FLAC__metadata_simple_iterator_get_block(it); + if (!block) + break; + + flac_scan_metadata(char_tnum, block, handler, handler_ctx); + FLAC__metadata_object_delete(block); + } while (FLAC__metadata_simple_iterator_next(it)); + + FLAC__metadata_simple_iterator_delete(it); + + return true; +} + +struct tag * +flac_tag_load(const char *file, const char *char_tnum) +{ + struct tag *tag = tag_new(); + + if (!flac_scan_file2(file, char_tnum, &add_tag_handler, tag) || + tag_is_empty(tag)) { + tag_free(tag); + tag = nullptr; + } + + return tag; +} -- cgit v1.2.3