2 * Copyright (C) 1997 Andre Noll <maan@tuebingen.mpg.de>
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/types.h>
18 typedef void afh_init_func(struct audio_format_handler *);
20 * Declaration of the audio format handler init functions.
22 * These symbols are referenced in the afl array below.
24 * Most audio format handlers depend on an external library and are not
25 * compiled in if the library is not installed. Hence it is well possible that
26 * not all of these functions are defined. It does not hurt to declare them
27 * anyway, and this avoids another set of ifdefs.
29 extern afh_init_func mp3_init, ogg_init, aac_afh_init, wma_afh_init,
30 spx_afh_init, flac_afh_init, opus_afh_init;
32 /** The list of all status items */
33 const char *status_item_list[] = {STATUS_ITEM_ARRAY};
36 * The list of supported audio formats.
38 * We always define the full array of audio formats even if some audio formats
39 * were not compiled in. This is because for each audio file the number of its
40 * audio format is stored in the database. We don't want that numbers to become
41 * stale just because the user installed a new version of paraslash that
42 * supports a different set of audio formats.
44 * It can still be easily detected whether an audio format is compiled in by
45 * checking if the init function pointer is not \p NULL.
47 static struct audio_format_handler afl[] = {
54 #if defined(HAVE_OGG) && defined(HAVE_VORBIS)
60 #if defined(HAVE_FAAD)
70 #if defined(HAVE_OGG) && defined(HAVE_SPEEX)
76 #if defined(HAVE_OGG) && defined(HAVE_FLAC)
77 .init = flac_afh_init,
82 #if defined(HAVE_OGG) && defined(HAVE_OPUS)
83 .init = opus_afh_init,
91 static inline int next_audio_format(int format)
94 if (!afl[format].name)
102 /** Iterate over each supported audio format. */
103 #define FOR_EACH_AUDIO_FORMAT(i) for (i = 0; afl[i].name; i = next_audio_format(i))
106 * Call the init function of each supported audio format handler.
112 PARA_NOTICE_LOG("supported audio formats: %s\n", AUDIO_FORMAT_HANDLERS);
113 FOR_EACH_AUDIO_FORMAT(i) {
114 PARA_INFO_LOG("initializing %s handler\n",
115 audio_format_name(i));
116 afl[i].init(&afl[i]);
121 * Tell whether an audio format handler provides chunk tables.
123 * Each audio format handler either provides a chunk table or supports dynamic
126 * \param audio_format_id Offset in the afl array.
128 * \return True if dynamic chunks are supported, false if the audio format
129 * handler provides chunk tables.
131 bool afh_supports_dynamic_chunks(int audio_format_id)
133 return afl[audio_format_id].get_chunk;
137 * Guess the audio format judging from filename.
139 * \param name The filename.
141 * \return This function returns \p -E_AUDIO_FORMAT if it has no idea what kind
142 * of audio file this might be. Otherwise the (non-negative) number of the
143 * audio format is returned.
145 int guess_audio_format(const char *name)
147 int i,j, len = strlen(name);
149 FOR_EACH_AUDIO_FORMAT(i) {
150 for (j = 0; afl[i].suffixes[j]; j++) {
151 const char *p = afl[i].suffixes[j];
152 int plen = strlen(p);
155 if (name[len - plen - 1] != '.')
157 if (strcasecmp(name + len - plen, p))
159 // PARA_DEBUG_LOG("might be %s\n", audio_format_name(i));
163 return -E_AUDIO_FORMAT;
167 * Get the name of the given audio format.
169 * \param i The audio format number.
171 * \return This returns a pointer to statically allocated memory so it
172 * must not be freed by the caller.
174 const char *audio_format_name(int i)
176 if (i < 0 || i >= ARRAY_SIZE(afl) - 1)
181 static int get_file_info(int format, const char *path, char *data,
182 size_t size, int fd, struct afh_info *afhi)
185 const char *fmt = audio_format_name(format);
187 memset(afhi, 0, sizeof(*afhi));
188 ret = afl[format].get_file_info(data, size, fd, afhi);
190 PARA_WARNING_LOG("%s: %s format not detected: %s\n",
191 path, fmt, para_strerror(-ret));
194 PARA_NOTICE_LOG("%s: detected %s format\n", path, fmt);
199 * Call get_file_info() to obtain an afhi structure.
201 * \param path The full path of the audio file.
202 * \param data Pointer to the contents of the (mapped) file.
203 * \param size The file size in bytes.
204 * \param fd The open file descriptor.
205 * \param afhi Result pointer.
207 * \return The number of the audio format on success, \p -E_AUDIO_FORMAT if no
208 * compiled in audio format handler is able to handler the file.
210 * This function tries to find an audio format handler that can interpret the
211 * file given by \a data and \a size.
213 * It first tries to determine the audio format from the filename given by \a
214 * path. If this doesn't work, all other audio format handlers are tried until
215 * one is found that can handle the file.
217 int compute_afhi(const char *path, char *data, size_t size, int fd,
218 struct afh_info *afhi)
222 format = guess_audio_format(path);
224 ret = get_file_info(format, path, data, size, fd, afhi);
228 FOR_EACH_AUDIO_FORMAT(i) {
229 if (i == format) /* we already tried this one to no avail */
231 ret = get_file_info(i, path, data, size, fd, afhi);
235 return -E_AUDIO_FORMAT;
238 afhi->techinfo = para_strdup(NULL);
239 if (!afhi->tags.artist)
240 afhi->tags.artist = para_strdup(NULL);
241 if (!afhi->tags.title)
242 afhi->tags.title = para_strdup(NULL);
243 if (!afhi->tags.year)
244 afhi->tags.year = para_strdup(NULL);
245 if (!afhi->tags.album)
246 afhi->tags.album = para_strdup(NULL);
247 if (!afhi->tags.comment)
248 afhi->tags.comment = para_strdup(NULL);
249 PARA_DEBUG_LOG("techinfo: %s\n", afhi->techinfo);
250 PARA_DEBUG_LOG("artist: %s\n", afhi->tags.artist);
251 PARA_DEBUG_LOG("title: %s\n", afhi->tags.title);
252 PARA_DEBUG_LOG("year: %s\n", afhi->tags.year);
253 PARA_DEBUG_LOG("album: %s\n", afhi->tags.album);
254 PARA_DEBUG_LOG("comment: %s\n", afhi->tags.comment);
259 * Deallocate the contents of an afh_info structure.
261 * \param afhi The structure to clear.
263 * This only frees the memory the various pointer fields of \a afhi point to.
264 * It does *not* free \a afhi itself.
266 void clear_afhi(struct afh_info *afhi)
270 free(afhi->chunk_table);
271 free(afhi->techinfo);
272 free(afhi->tags.artist);
273 free(afhi->tags.title);
274 free(afhi->tags.year);
275 free(afhi->tags.album);
276 free(afhi->tags.comment);
279 static inline size_t get_chunk_len(long unsigned chunk_num,
280 const struct afh_info *afhi)
282 return afhi->chunk_table[chunk_num + 1] - afhi->chunk_table[chunk_num];
286 * Get one chunk of audio data.
288 * This implicitly calls the ->open method of the audio format handler at the
291 * \param chunk_num The number of the chunk to get.
292 * \param afhi Describes the audio file.
293 * \param audio_format_id Determines the afh.
294 * \param map The memory mapped audio file.
295 * \param mapsize Passed to the afh's ->open() method.
296 * \param buf Result pointer.
297 * \param len The length of the chunk in bytes.
298 * \param afh_context Value/result, determines whether ->open() is called.
300 * Upon return, \a buf will point so memory inside \a map. The returned buffer
301 * must therefore not be freed by the caller.
305 __must_check int afh_get_chunk(long unsigned chunk_num, struct afh_info *afhi,
306 uint8_t audio_format_id, const void *map, size_t mapsize,
307 const char **buf, size_t *len, void **afh_context)
309 struct audio_format_handler *afh = afl + audio_format_id;
311 if (afh_supports_dynamic_chunks(audio_format_id)) {
315 ret = afh->open(map, mapsize, afh_context);
319 ret = afl[audio_format_id].get_chunk(chunk_num, *afh_context,
322 afh->close(*afh_context);
327 size_t pos = afhi->chunk_table[chunk_num];
329 *len = get_chunk_len(chunk_num, afhi);
335 * Deallocate resources allocated due to dynamic chunk handling.
337 * This function should be called if afh_get_chunk() was called at least once.
338 * It is OK to call it even for audio formats which do not support dynamic
339 * chunks, in which case the function does nothing.
341 * \param afh_context As returned from the ->open method of the afh.
342 * \param audio_format_id Determines the afh.
344 void afh_close(void *afh_context, uint8_t audio_format_id)
346 struct audio_format_handler *afh = afl + audio_format_id;
348 if (!afh_supports_dynamic_chunks(audio_format_id))
354 afh->close(afh_context);
358 * Find a suitable start chunk.
360 * \param approx_chunk_num Upper bound for the chunk number to return.
361 * \param afhi Needed for the chunk table.
362 * \param audio_format_id Determines the afh.
364 * \return For audio format handlers which support dynamic chunks, the function
365 * returns the given chunk number. Otherwise it returns the first non-empty
366 * chunk <= \a approx_chunk_num.
368 * \sa \ref afh_get_chunk().
370 int32_t afh_get_start_chunk(int32_t approx_chunk_num,
371 const struct afh_info *afhi, uint8_t audio_format_id)
375 if (afh_supports_dynamic_chunks(audio_format_id))
376 return approx_chunk_num;
378 for (k = PARA_MAX(0, approx_chunk_num); k >= 0; k--)
379 if (get_chunk_len(k, afhi) > 0)
385 * Get the header of an audio file.
387 * \param afhi The audio file handler data describing the file.
388 * \param audio_format_id Determines the audio format handler.
389 * \param map The data of the audio file.
390 * \param mapsize The amount of bytes of the mmapped audio file.
391 * \param buf The length of the header is stored here.
392 * \param len Points to a buffer containing the header on return.
394 * This function sets \a buf to \p NULL and \a len to zero if \a map or \a
395 * afhi is \p NULL, or if the current audio format does not need special
398 * Otherwise, it is checked whether the audio format handler given by
399 * \a audio_format_id defines a ->get_header() method. If it does, this
400 * method is called to obtain the header. If ->get_header() is \p NULL,
401 * a reference to the first chunk of the audio file is returned.
403 * Once the header is no longer needed, the caller must call \ref
404 * afh_free_header() to free the resources allocated by this function.
406 void afh_get_header(struct afh_info *afhi, uint8_t audio_format_id,
407 void *map, size_t mapsize, char **buf, size_t *len)
409 struct audio_format_handler *afh = afl + audio_format_id;
411 if (!map || !afhi || !afhi->header_len) {
416 if (!afh->get_header) {
417 *len = afhi->header_len;
421 afh->get_header(map, mapsize, buf, len);
425 * Deallocate any resources obtained from afh_get_header().
427 * \param header_buf Pointer obtained via afh_get_header().
428 * \param audio_format_id Determines the audio format handler.
430 void afh_free_header(char *header_buf, uint8_t audio_format_id)
432 struct audio_format_handler *afh = afl + audio_format_id;
439 * Pretty-print the contents of a struct afh_info into a buffer.
441 * \param audio_format_num The audio format number.
442 * \param afhi Pointer to the structure that contains the information.
443 * \param result Pretty-printed ahfi is here after the call.
445 * The \a result buffer is dynamically allocated and should be freed by the
448 * \return The number of bytes. This function never fails.
450 unsigned afh_get_afhi_txt(int audio_format_num, struct afh_info *afhi, char **result)
452 return xasprintf(result, "%s: %dkbit/s\n" /* bitrate */
453 "%s: %s\n" /* format */
454 "%s: %dHz\n" /* frequency */
455 "%s: %d\n" /* channels */
456 "%s: %" PRIu32 "\n" /* seconds total */
457 "%s: %lu: %lu\n" /* chunk time */
458 "%s: %" PRIu32 "\n" /* num chunks */
459 "%s: %" PRIu32 "\n" /* max chunk size */
460 "%s: %s\n" /* techinfo */
461 "%s: %s\n" /* artist */
462 "%s: %s\n" /* title */
463 "%s: %s\n" /* year */
464 "%s: %s\n" /* album */
465 "%s: %s\n", /* comment */
466 status_item_list[SI_BITRATE], afhi->bitrate,
467 status_item_list[SI_FORMAT], audio_format_name(audio_format_num),
468 status_item_list[SI_FREQUENCY], afhi->frequency,
469 status_item_list[SI_CHANNELS], afhi->channels,
470 status_item_list[SI_SECONDS_TOTAL], afhi->seconds_total,
471 status_item_list[SI_CHUNK_TIME], (long unsigned)afhi->chunk_tv.tv_sec,
472 (long unsigned)afhi->chunk_tv.tv_usec,
473 status_item_list[SI_NUM_CHUNKS], afhi->chunks_total,
474 status_item_list[SI_MAX_CHUNK_SIZE], afhi->max_chunk_size,
475 status_item_list[SI_TECHINFO], afhi->techinfo? afhi->techinfo : "",
476 status_item_list[SI_ARTIST], afhi->tags.artist? afhi->tags.artist : "",
477 status_item_list[SI_TITLE], afhi->tags.title? afhi->tags.title : "",
478 status_item_list[SI_YEAR], afhi->tags.year? afhi->tags.year : "",
479 status_item_list[SI_ALBUM], afhi->tags.album? afhi->tags.album : "",
480 status_item_list[SI_COMMENT], afhi->tags.comment? afhi->tags.comment : ""
485 * Determine the maximal chunk size by investigating the chunk table.
487 * \param afhi Value/result.
489 * This function iterates over the chunk table and sets ->max_chunk_size
490 * accordingly. The function exists only for backward compatibility since as of
491 * version 0.6.0, para_server stores the maximal chunk size in its database.
492 * This function is only called if the database value is zero, indicating that
493 * the file was added by an older server version.
495 void set_max_chunk_size(struct afh_info *afhi)
497 uint32_t n, max = 0, old = 0;
499 for (n = 0; n <= afhi->chunks_total; n++) {
500 uint32_t val = afhi->chunk_table[n];
502 * If the first chunk is the header, do not consider it for the
503 * calculation of the largest chunk size.
505 if (n == 0 || (n == 1 && afhi->header_len > 0)) {
509 max = PARA_MAX(max, val - old);
512 afhi->max_chunk_size = max;
516 * Create a copy of the given file with altered meta tags.
518 * \param audio_format_id Specifies the audio format.
519 * \param map The (read-only) memory map of the input file.
520 * \param mapsize The size of the input file in bytes.
521 * \param tags The new tags.
522 * \param output_fd Altered file is created using this file descriptor.
523 * \param filename The name of the temporary output file.
525 * This calls the ->rewrite_tags method of the audio format handler associated
526 * with \a audio_format_id to create a copy of the memory-mapped file given
527 * by \a map and \a mapsize, but with altered tags according to \a tags. If
528 * the audio format handler for \a audio_format_id lacks this optional method,
529 * the function returns (the paraslash error code of) \p ENOTSUP.
533 int afh_rewrite_tags(int audio_format_id, void *map, size_t mapsize,
534 struct taginfo *tags, int output_fd, const char *filename)
536 struct audio_format_handler *afh = afl + audio_format_id;
538 if (!afh->rewrite_tags)
539 return -ERRNO_TO_PARA_ERROR(ENOTSUP);
540 return afh->rewrite_tags(map, mapsize, tags, output_fd, filename);