450 lines
15 KiB
C
450 lines
15 KiB
C
/*
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* Metadata hub and access methods.
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* Basically, if you need to store metadata
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* (e.g. for use with the dbus interfaces),
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* then you need a metadata hub,
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* where everything is stored
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* This file is part of Shairport Sync.
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* Copyright (c) Mike Brady 2017--2018
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* All rights reserved.
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use,
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* copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <stdlib.h>
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#include <string.h>
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#include <dirent.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include "config.h"
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#include "common.h"
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#include "dacp.h"
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#include "metadata_hub.h"
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#ifdef HAVE_LIBMBEDTLS
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#include <mbedtls/md5.h>
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#endif
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#ifdef HAVE_LIBPOLARSSL
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#include <polarssl/md5.h>
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#endif
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#ifdef HAVE_LIBSSL
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#include <openssl/md5.h>
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#endif
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pthread_rwlock_t metadata_hub_re_lock = PTHREAD_RWLOCK_INITIALIZER;
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void release_char_string(char **str) {
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if (*str) {
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free(*str);
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*str=NULL;
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}
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}
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void metadata_hub_init(void) {
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// debug(1, "Metadata bundle initialisation.");
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memset(&metadata_store, 0, sizeof(metadata_store));
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}
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void add_metadata_watcher(metadata_watcher fn, void *userdata) {
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int i;
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for (i = 0; i < number_of_watchers; i++) {
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if (metadata_store.watchers[i] == NULL) {
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metadata_store.watchers[i] = fn;
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metadata_store.watchers_data[i] = userdata;
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// debug(1, "Added a metadata watcher into slot %d", i);
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break;
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}
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}
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}
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void metadata_hub_modify_prolog(void) {
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// always run this before changing an entry or a sequence of entries in the metadata_hub
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// debug(1, "locking metadata hub for writing");
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pthread_rwlock_wrlock(&metadata_hub_re_lock);
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}
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void metadata_hub_release_track_artwork(void) {
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debug(1,"release track artwork");
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release_char_string(&metadata_store.cover_art_pathname);
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}
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void metadata_hub_reset_track_metadata(void) {
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debug(1,"release track metadata");
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release_char_string(&metadata_store.track_name);
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release_char_string(&metadata_store.artist_name);
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release_char_string(&metadata_store.album_name);
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release_char_string(&metadata_store.genre);
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release_char_string(&metadata_store.comment);
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release_char_string(&metadata_store.composer);
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release_char_string(&metadata_store.file_kind);
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release_char_string(&metadata_store.sort_as);
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metadata_store.item_id = 0;
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metadata_store.songtime_in_milliseconds = 0;
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}
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void run_metadata_watchers(void) {
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int i;
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// debug(1, "locking metadata hub for reading");
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pthread_rwlock_rdlock(&metadata_hub_re_lock);
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for (i = 0; i < number_of_watchers; i++) {
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if (metadata_store.watchers[i]) {
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metadata_store.watchers[i](&metadata_store, metadata_store.watchers_data[i]);
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}
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}
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// debug(1, "unlocking metadata hub for reading");
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pthread_rwlock_unlock(&metadata_hub_re_lock);
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}
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void metadata_hub_modify_epilog(int modified) {
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// always run this after changing an entry or a sequence of entries in the metadata_hub
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// debug(1, "unlocking metadata hub for writing");
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pthread_rwlock_unlock(&metadata_hub_re_lock);
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if (modified) {
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run_metadata_watchers();
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}
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}
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char *metadata_write_image_file(const char *buf, int len) {
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// warning -- this removes all files from the directory apart from this one, if it exists
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// it will return a path to the image file allocated with malloc.
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// free it if you don't need it.
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char *path = NULL; // this will be what is returned
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uint8_t img_md5[16];
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// uint8_t ap_md5[16];
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#ifdef HAVE_LIBSSL
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MD5_CTX ctx;
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MD5_Init(&ctx);
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MD5_Update(&ctx, buf, len);
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MD5_Final(img_md5, &ctx);
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#endif
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#ifdef HAVE_LIBMBEDTLS
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mbedtls_md5_context tctx;
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mbedtls_md5_starts(&tctx);
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mbedtls_md5_update(&tctx, buf, len);
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mbedtls_md5_finish(&tctx, img_md5);
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#endif
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#ifdef HAVE_LIBPOLARSSL
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md5_context tctx;
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md5_starts(&tctx);
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md5_update(&tctx, buf, len);
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md5_finish(&tctx, img_md5);
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#endif
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char img_md5_str[33];
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memset(img_md5_str, 0, sizeof(img_md5_str));
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char *ext;
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char png[] = "png";
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char jpg[] = "jpg";
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int i;
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for (i = 0; i < 16; i++)
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sprintf(&img_md5_str[i * 2], "%02x", (uint8_t)img_md5[i]);
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// see if the file is a jpeg or a png
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if (strncmp(buf, "\xFF\xD8\xFF", 3) == 0)
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ext = jpg;
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else if (strncmp(buf, "\x89\x50\x4E\x47\x0D\x0A\x1A\x0A", 8) == 0)
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ext = png;
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else {
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debug(1, "Unidentified image type of cover art -- jpg extension used.");
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ext = jpg;
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}
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mode_t oldumask = umask(000);
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int result = mkpath(config.cover_art_cache_dir, 0777);
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umask(oldumask);
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if ((result == 0) || (result == -EEXIST)) {
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// see if the file exists by opening it.
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// if it exists, we're done
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char *prefix = "cover-";
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size_t pl = strlen(config.cover_art_cache_dir) + 1 + strlen(prefix) + strlen(img_md5_str) + 1 +
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strlen(ext);
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path = malloc(pl + 1);
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snprintf(path, pl + 1, "%s/%s%s.%s", config.cover_art_cache_dir, prefix, img_md5_str, ext);
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int cover_fd = open(path, O_WRONLY | O_CREAT | O_EXCL, S_IRUSR | S_IWUSR);
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if (cover_fd > 0) {
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// write the contents
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if (write(cover_fd, buf, len) < len) {
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warn("Writing cover art file \"%s\" failed!", path);
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free(path);
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path = NULL;
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}
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close(cover_fd);
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// now delete all other files, if there are any
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DIR *d;
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struct dirent *dir;
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d = opendir(config.cover_art_cache_dir);
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if (d) {
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int fnl = strlen(prefix) + strlen(img_md5_str) + 1 + strlen(ext) + 1;
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char *full_filename = malloc(fnl);
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if (full_filename == NULL)
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die("Can't allocate memory at metadata_write_image_file.");
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memset(full_filename, 0, fnl);
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snprintf(full_filename, fnl, "%s%s.%s", prefix, img_md5_str, ext);
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int dir_fd = open(config.cover_art_cache_dir, O_DIRECTORY);
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if (dir_fd > 0) {
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while ((dir = readdir(d)) != NULL) {
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if (dir->d_type == DT_REG) {
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if (strcmp(full_filename, dir->d_name) != 0) {
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if (unlinkat(dir_fd, dir->d_name, 0) != 0) {
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debug(1, "Error %d deleting cover art file \"%s\".", errno, dir->d_name);
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}
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}
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}
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}
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} else {
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debug(1, "Can't open the directory for deletion.");
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}
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free(full_filename);
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closedir(d);
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}
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} else {
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// if (errno == EEXIST)
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// debug(1, "Cover art file \"%s\" already exists!", path);
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// else {
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if (errno != EEXIST) {
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warn("Could not open file \"%s\" for writing cover art", path);
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free(path);
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path = NULL;
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}
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}
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} else {
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debug(1, "Couldn't access or create the cover art cache directory \"%s\".",
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config.cover_art_cache_dir);
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}
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return path;
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}
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void metadata_hub_process_metadata(uint32_t type, uint32_t code, char *data, uint32_t length) {
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// metadata coming in from the audio source or from Shairport Sync itself passes through here
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// this has more information about tags, which might be relevant:
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// https://code.google.com/p/ytrack/wiki/DMAP
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// all the following items of metadata are contained in one metadata packet
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// they are preseded by an 'ssnc' 'mdst' item and followed by an 'ssnc 'mden' item.
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if (type == 'core') {
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switch (code) {
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case 'asal':
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if ((metadata_store.album_name == NULL) ||
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(strncmp(metadata_store.album_name, data, length) != 0)) {
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if (metadata_store.album_name)
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free(metadata_store.album_name);
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metadata_store.album_name = strndup(data, length);
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debug(1, "MH Album name set to: \"%s\"", metadata_store.album_name);
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metadata_store.album_name_changed = 1;
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metadata_store.changed = 1;
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}
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break;
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case 'asar':
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if ((metadata_store.artist_name == NULL) ||
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(strncmp(metadata_store.artist_name, data, length) != 0)) {
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if (metadata_store.artist_name)
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free(metadata_store.artist_name);
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metadata_store.artist_name = strndup(data, length);
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debug(1, "MH Artist name set to: \"%s\"", metadata_store.artist_name);
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metadata_store.artist_name_changed = 1;
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metadata_store.changed = 1;
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}
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break;
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case 'ascm':
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if ((metadata_store.comment == NULL) ||
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(strncmp(metadata_store.comment, data, length) != 0)) {
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if (metadata_store.comment)
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free(metadata_store.comment);
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metadata_store.comment = strndup(data, length);
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debug(1, "MH Comment set to: \"%s\"", metadata_store.comment);
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metadata_store.comment_changed = 1;
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metadata_store.changed = 1;
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}
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break;
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case 'asgn':
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if ((metadata_store.genre == NULL) || (strncmp(metadata_store.genre, data, length) != 0)) {
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if (metadata_store.genre)
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free(metadata_store.genre);
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metadata_store.genre = strndup(data, length);
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debug(1, "MH Genre set to: \"%s\"", metadata_store.genre);
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metadata_store.genre_changed = 1;
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metadata_store.changed = 1;
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}
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break;
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case 'minm':
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if ((metadata_store.track_name == NULL) ||
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(strncmp(metadata_store.track_name, data, length) != 0)) {
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if (metadata_store.track_name)
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free(metadata_store.track_name);
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metadata_store.track_name = strndup(data, length);
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debug(1, "MH Track name set to: \"%s\"", metadata_store.track_name);
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metadata_store.track_name_changed = 1;
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metadata_store.changed = 1;
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}
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break;
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case 'ascp':
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if ((metadata_store.composer == NULL) ||
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(strncmp(metadata_store.composer, data, length) != 0)) {
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if (metadata_store.composer)
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free(metadata_store.composer);
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metadata_store.composer = strndup(data, length);
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debug(1, "MH Composer set to: \"%s\"", metadata_store.composer);
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metadata_store.composer_changed = 1;
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metadata_store.changed = 1;
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}
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break;
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case 'asdt':
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if ((metadata_store.file_kind == NULL) ||
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(strncmp(metadata_store.file_kind, data, length) != 0)) {
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if (metadata_store.file_kind)
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free(metadata_store.file_kind);
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metadata_store.file_kind = strndup(data, length);
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debug(1, "MH File Kind set to: \"%s\"", metadata_store.file_kind);
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metadata_store.file_kind_changed = 1;
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metadata_store.changed = 1;
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}
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break;
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case 'asaa':
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if ((metadata_store.file_kind == NULL) ||
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(strncmp(metadata_store.file_kind, data, length) != 0)) {
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if (metadata_store.file_kind)
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free(metadata_store.file_kind);
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metadata_store.file_kind = strndup(data, length);
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debug(1, "MH File Kind set to: \"%s\"", metadata_store.file_kind);
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metadata_store.file_kind_changed = 1;
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metadata_store.changed = 1;
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}
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break;
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case 'assn':
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if ((metadata_store.sort_as == NULL) ||
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(strncmp(metadata_store.sort_as, data, length) != 0)) {
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if (metadata_store.sort_as)
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free(metadata_store.sort_as);
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metadata_store.sort_as = strndup(data, length);
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debug(1, "MH Sort As set to: \"%s\"", metadata_store.sort_as);
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metadata_store.sort_as_changed = 1;
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metadata_store.changed = 1;
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}
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break;
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// default:
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/*
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{
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char typestring[5];
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*(uint32_t *)typestring = htonl(type);
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typestring[4] = 0;
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char codestring[5];
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*(uint32_t *)codestring = htonl(code);
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codestring[4] = 0;
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char *payload;
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if (length < 2048)
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payload = strndup(data, length);
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else
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payload = NULL;
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debug(1, "MH \"%s\" \"%s\" (%d bytes): \"%s\".", typestring, codestring, length, payload);
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if (payload)
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free(payload);
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}
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*/
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}
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} else if (type == 'ssnc') {
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switch (code) {
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// ignore the following
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case 'pcst':
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case 'pcen':
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break;
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case 'mdst':
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debug(1, "MH Metadata stream processing start.");
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metadata_hub_modify_prolog();
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break;
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case 'mden':
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metadata_hub_modify_epilog(1);
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debug(1, "MH Metadata stream processing end.");
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break;
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case 'PICT':
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if (length > 16) {
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metadata_hub_modify_prolog();
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debug(1, "MH Picture received, length %u bytes.", length);
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if (metadata_store.cover_art_pathname)
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free(metadata_store.cover_art_pathname);
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metadata_store.cover_art_pathname = metadata_write_image_file(data, length);
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metadata_hub_modify_epilog(1);
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}
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break;
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case 'clip':
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if ((metadata_store.client_ip == NULL) ||
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(strncmp(metadata_store.client_ip, data, length) != 0)) {
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metadata_hub_modify_prolog();
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if (metadata_store.client_ip)
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free(metadata_store.client_ip);
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metadata_store.client_ip = strndup(data, length);
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// debug(1, "MH Client IP set to: \"%s\"", metadata_store.client_ip);
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metadata_store.client_ip_changed = 1;
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metadata_store.changed = 1;
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metadata_hub_modify_epilog(1);
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}
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break;
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case 'svip':
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if ((metadata_store.server_ip == NULL) ||
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(strncmp(metadata_store.server_ip, data, length) != 0)) {
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metadata_hub_modify_prolog();
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if (metadata_store.server_ip)
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free(metadata_store.server_ip);
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metadata_store.server_ip = strndup(data, length);
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// debug(1, "MH Server IP set to: \"%s\"", metadata_store.server_ip);
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metadata_hub_modify_epilog(1);
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}
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break;
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default: {
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char typestring[5];
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*(uint32_t *)typestring = htonl(type);
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typestring[4] = 0;
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char codestring[5];
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*(uint32_t *)codestring = htonl(code);
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codestring[4] = 0;
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char *payload;
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if (length < 2048)
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payload = strndup(data, length);
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else
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payload = NULL;
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// debug(1, "MH \"%s\" \"%s\" (%d bytes): \"%s\".", typestring, codestring, length, payload);
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if (payload)
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free(payload);
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}
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}
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}
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}
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