2 * Copyright (C) 1997-2009 Andre Noll <maan@systemlinux.org>
4 * Licensed under the GPL v2. For licencing details see COPYING.
7 /** \file afh_common.c Common audio format handler functions. */
9 #include <sys/mman.h> /* mmap */
10 #include <sys/time.h> /* gettimeofday */
11 #include <sys/types.h>
20 /* The mp3 audio format handler does not need any libs. */
21 void mp3_init(struct audio_format_handler *);
24 void ogg_init(struct audio_format_handler *);
27 void aac_afh_init(struct audio_format_handler *);
30 void wma_afh_init(struct audio_format_handler *);
32 * The list of supported audio formats.
34 * We always define the full array of audio formats even if some audio formats
35 * were not compiled in. This is because for each audio file the number of its
36 * audio format is stored in the database. We don't want that numbers to become
37 * stale just because the user installed a new version of paraslash that
38 * supports a different set of audio formats.
40 * It can still be easily detected whether an audio format is compiled in by
41 * checking if the init function pointer is not \p NULL.
43 static struct audio_format_handler afl[] = {
69 static inline int next_audio_format(int format)
72 if (!afl[format].name)
81 /** Iterate over each supported audio format. */
82 #define FOR_EACH_AUDIO_FORMAT(i) for (i = 0; afl[i].name; i = next_audio_format(i))
85 * Call the init function of each supported audio format handler.
91 PARA_INFO_LOG("supported audio formats: %s\n",
92 SUPPORTED_AUDIO_FORMATS);
93 FOR_EACH_AUDIO_FORMAT(i) {
94 PARA_NOTICE_LOG("initializing %s handler\n",
95 audio_format_name(i));
101 * Guess the audio format judging from filename.
103 * \param name The filename.
105 * \return This function returns \p -E_AUDIO_FORMAT if it has no idea what kind
106 * of audio file this might be. Otherwise the (non-negative) number of the
107 * audio format is returned.
109 int guess_audio_format(const char *name)
111 int i,j, len = strlen(name);
113 FOR_EACH_AUDIO_FORMAT(i) {
114 for (j = 0; afl[i].suffixes[j]; j++) {
115 const char *p = afl[i].suffixes[j];
116 int plen = strlen(p);
119 if (name[len - plen - 1] != '.')
121 if (strcasecmp(name + len - plen, p))
123 // PARA_DEBUG_LOG("might be %s\n", audio_format_name(i));
127 return -E_AUDIO_FORMAT;
131 * Call get_file_info() to obtain an afhi structure.
133 * \param path The full path of the audio file.
134 * \param data Pointer to the contents of the (mapped) file.
135 * \param size The file size in bytes.
136 * \param fd The open file descriptor.
137 * \param afhi Result pointer.
139 * \return The number of the audio format on success, \p -E_AUDIO_FORMAT if no
140 * compiled in audio format handler is able to handler the file.
142 * This function tries to find an audio format handler that can interpret the
143 * file given by \a data and \a size.
145 * It first tries to determine the audio format from the filename given by \a
146 * path. If this doesn't work, all other audio format handlers are tried until
147 * one is found that can handle the file.
149 int compute_afhi(const char *path, char *data, size_t size, int fd,
150 struct afh_info *afhi)
154 afhi->header_offset = 0;
155 afhi->header_len = 0;
156 afhi->techinfo = NULL;
157 afhi->tags.artist = NULL;
158 afhi->tags.title = NULL;
159 afhi->tags.year = NULL;
160 afhi->tags.album = NULL;
161 afhi->tags.comment = NULL;
162 format = guess_audio_format(path);
165 ret = afl[format].get_file_info(data, size, fd, afhi);
171 FOR_EACH_AUDIO_FORMAT(i) {
172 if (i == format) /* we already tried this one to no avail */
174 ret = afl[i].get_file_info(data, size, fd, afhi);
179 PARA_WARNING_LOG("%s\n", para_strerror(-ret));
181 return -E_AUDIO_FORMAT;
184 afhi->techinfo = para_strdup(NULL);
185 if (!afhi->tags.artist)
186 afhi->tags.artist = para_strdup(NULL);
187 if (!afhi->tags.title)
188 afhi->tags.title = para_strdup(NULL);
189 if (!afhi->tags.year)
190 afhi->tags.year = para_strdup(NULL);
191 if (!afhi->tags.album)
192 afhi->tags.album = para_strdup(NULL);
193 if (!afhi->tags.comment)
194 afhi->tags.comment = para_strdup(NULL);
195 PARA_DEBUG_LOG("techinfo: %s\n", afhi->techinfo);
196 PARA_DEBUG_LOG("artist: %s\n", afhi->tags.artist);
197 PARA_DEBUG_LOG("title: %s\n", afhi->tags.title);
198 PARA_DEBUG_LOG("year: %s\n", afhi->tags.year);
199 PARA_DEBUG_LOG("album: %s\n", afhi->tags.album);
200 PARA_DEBUG_LOG("comment: %s\n", afhi->tags.comment);
205 * Get the name of the given audio format.
207 * \param i The audio format number.
209 * This returns a pointer to statically allocated memory so it
210 * must not be freed by the caller.
212 const char *audio_format_name(int i)
214 if (i < 0 || i >= ARRAY_SIZE(afl) - 1)
220 * Get one chunk of audio data.
222 * \param chunk_num The number of the chunk to get.
223 * \param afhi Describes the audio file.
224 * \param map The memory mapped audio file.
225 * \param buf Result pointer.
226 * \param len The length of the chunk in bytes.
228 * Upon return, \a buf will point so memory inside \a map. The returned buffer
229 * must therefore not be freed by the caller.
231 void afh_get_chunk(long unsigned chunk_num, struct afh_info *afhi,
232 void *map, const char **buf, size_t *len)
234 size_t pos = afhi->chunk_table[chunk_num];
236 *len = afhi->chunk_table[chunk_num + 1] - pos;
239 uint32_t afh_get_largest_chunk_size(struct afh_info *afhi)
241 uint32_t n, largest = 0, *ct = afhi->chunk_table;
243 for (n = 1; n <= afhi->chunks_total; n++)
244 largest = PARA_MAX(largest, ct[n] - ct[n - 1]);
249 * Get the header of an audio file.
251 * \param afhi The audio file handler data describing the file.
252 * \param map The data of the audio file.
253 * \param buf The length of the header is stored here.
254 * \param len Points to a buffer containing the header on return.
256 * This function sets \a buf to \p NULL and \a len to zero if \a map or \a
257 * afhi is \p NULL, or if the current audio format does not need special
260 void afh_get_header(struct afh_info *afhi, void *map, const char **buf, size_t *len)
262 if (!map || !afhi || !afhi->header_len) {
267 *len = afhi->header_len;
268 *buf = map + afhi->header_offset;