afh_common.c

   1 /*
   2  * Copyright (C) 1997-2013 Andre Noll <maan@systemlinux.org>
   3  *
   4  * Licensed under the GPL v2. For licencing details see COPYING.
   5  */
   6
   7 /** \file afh_common.c Common audio format handler functions. */
   8
   9 #include <sys/mman.h> /* mmap */
  10 #include <sys/types.h>
  11 #include <regex.h>
  12
  13 #include "para.h"
  14 #include "error.h"
  15 #include "string.h"
  16 #include "afh.h"
  17
  18 /* The mp3 audio format handler does not need any libs. */
  19 void mp3_init(struct audio_format_handler *);
  20
  21 #ifdef HAVE_OGGVORBIS
  22         void ogg_init(struct audio_format_handler *);
  23 #endif
  24 #ifdef HAVE_FAAD
  25         void aac_afh_init(struct audio_format_handler *);
  26 #endif
  27 #ifdef HAVE_SPEEX
  28         void spx_afh_init(struct audio_format_handler *);
  29 #endif
  30 #ifdef HAVE_FLAC
  31         void flac_afh_init(struct audio_format_handler *);
  32 #endif
  33
  34 void wma_afh_init(struct audio_format_handler *);
  35
  36 /** The list of all status items */
  37 const char *status_item_list[] = {STATUS_ITEM_ARRAY};
  38
  39 /**
  40  * The list of supported audio formats.
  41  *
  42  * We always define the full array of audio formats even if some audio formats
  43  * were not compiled in. This is because for each audio file the number of its
  44  * audio format is stored in the database. We don't want that numbers to become
  45  * stale just because the user installed a new version of paraslash that
  46  * supports a different set of audio formats.
  47  *
  48  * It can still be easily detected whether an audio format is compiled in by
  49  * checking if the init function pointer is not \p NULL.
  50  */
  51 static struct audio_format_handler afl[] = {
  52         {
  53                 .name = "mp3",
  54                 .init = mp3_init,
  55         },
  56         {
  57                 .name = "ogg",
  58 #ifdef HAVE_OGGVORBIS
  59                 .init = ogg_init,
  60 #endif
  61         },
  62         {
  63                 .name = "aac",
  64 #ifdef HAVE_FAAD
  65                 .init = aac_afh_init,
  66 #endif
  67         },
  68         {
  69                 .name = "wma",
  70                 .init = wma_afh_init,
  71         },
  72         {
  73                 .name = "spx",
  74 #ifdef HAVE_SPEEX
  75                 .init = spx_afh_init,
  76 #endif
  77         },
  78         {
  79                 .name = "flac",
  80 #ifdef HAVE_FLAC
  81                 .init = flac_afh_init,
  82 #endif
  83         },
  84         {
  85                 .name = NULL,
  86         }
  87 };
  88
  89 static inline int next_audio_format(int format)
  90 {
  91         for (;;) {
  92                 if (!afl[format].name)
  93                         return format;
  94                 format++;
  95                 if (afl[format].init)
  96                         return format;
  97         }
  98
  99 }
 100
 101 /** Iterate over each supported audio format. */
 102 #define FOR_EACH_AUDIO_FORMAT(i) for (i = 0; afl[i].name; i = next_audio_format(i))
 103
 104 /**
 105  * Call the init function of each supported audio format handler.
 106  */
 107 void afh_init(void)
 108 {
 109         int i;
 110
 111         PARA_INFO_LOG("supported audio formats: %s\n", AUDIO_FORMAT_HANDLERS);
 112         FOR_EACH_AUDIO_FORMAT(i) {
 113                 PARA_NOTICE_LOG("initializing %s handler\n",
 114                         audio_format_name(i));
 115                 afl[i].init(&afl[i]);
 116         }
 117 }
 118
 119 /**
 120  * Guess the audio format judging from filename.
 121  *
 122  * \param name The filename.
 123  *
 124  * \return This function returns \p -E_AUDIO_FORMAT if it has no idea what kind
 125  * of audio file this might be. Otherwise the (non-negative) number of the
 126  * audio format is returned.
 127  */
 128 int guess_audio_format(const char *name)
 129 {
 130         int i,j, len = strlen(name);
 131
 132         FOR_EACH_AUDIO_FORMAT(i) {
 133                 for (j = 0; afl[i].suffixes[j]; j++) {
 134                         const char *p = afl[i].suffixes[j];
 135                         int plen = strlen(p);
 136                         if (len < plen + 1)
 137                                 continue;
 138                         if (name[len - plen - 1] != '.')
 139                                 continue;
 140                         if (strcasecmp(name + len - plen, p))
 141                                 continue;
 142 //                      PARA_DEBUG_LOG("might be %s\n", audio_format_name(i));
 143                         return i;
 144                 }
 145         }
 146         return -E_AUDIO_FORMAT;
 147 }
 148
 149 /**
 150  * Call get_file_info() to obtain an afhi structure.
 151  *
 152  * \param path The full path of the audio file.
 153  * \param data Pointer to the contents of the (mapped) file.
 154  * \param size The file size in bytes.
 155  * \param fd The open file descriptor.
 156  * \param afhi Result pointer.
 157  *
 158  * \return The number of the audio format on success, \p -E_AUDIO_FORMAT if no
 159  * compiled in audio format handler is able to handler the file.
 160  *
 161  * This function tries to find an audio format handler that can interpret the
 162  * file given by \a data and \a size.
 163  *
 164  * It first tries to determine the audio format from the filename given by \a
 165  * path. If this doesn't work, all other audio format handlers are tried until
 166  * one is found that can handle the file.
 167  */
 168 int compute_afhi(const char *path, char *data, size_t size, int fd,
 169                 struct afh_info *afhi)
 170 {
 171         int ret, i, format;
 172
 173         afhi->header_len = 0;
 174         afhi->techinfo = NULL;
 175         afhi->tags.artist = NULL;
 176         afhi->tags.title = NULL;
 177         afhi->tags.year = NULL;
 178         afhi->tags.album = NULL;
 179         afhi->tags.comment = NULL;
 180         format = guess_audio_format(path);
 181
 182         if (format >= 0) {
 183                 ret = afl[format].get_file_info(data, size, fd, afhi);
 184                 if (ret >= 0) {
 185                         ret = format;
 186                         goto success;
 187                 }
 188         }
 189         FOR_EACH_AUDIO_FORMAT(i) {
 190                 if (i == format) /* we already tried this one to no avail */
 191                         continue;
 192                 ret = afl[i].get_file_info(data, size, fd, afhi);
 193                 if (ret >= 0) {
 194                         ret = i;
 195                         goto success;
 196                 }
 197                 PARA_WARNING_LOG("%s\n", para_strerror(-ret));
 198         }
 199         return -E_AUDIO_FORMAT;
 200 success:
 201         if (!afhi->techinfo)
 202                 afhi->techinfo = para_strdup(NULL);
 203         if (!afhi->tags.artist)
 204                 afhi->tags.artist = para_strdup(NULL);
 205         if (!afhi->tags.title)
 206                 afhi->tags.title = para_strdup(NULL);
 207         if (!afhi->tags.year)
 208                 afhi->tags.year = para_strdup(NULL);
 209         if (!afhi->tags.album)
 210                 afhi->tags.album = para_strdup(NULL);
 211         if (!afhi->tags.comment)
 212                 afhi->tags.comment = para_strdup(NULL);
 213         PARA_DEBUG_LOG("techinfo: %s\n", afhi->techinfo);
 214         PARA_DEBUG_LOG("artist: %s\n", afhi->tags.artist);
 215         PARA_DEBUG_LOG("title: %s\n", afhi->tags.title);
 216         PARA_DEBUG_LOG("year: %s\n", afhi->tags.year);
 217         PARA_DEBUG_LOG("album: %s\n", afhi->tags.album);
 218         PARA_DEBUG_LOG("comment: %s\n", afhi->tags.comment);
 219         return ret;
 220 }
 221
 222 /**
 223  * Deallocate contents of a filled-in ahi structure
 224  *
 225  * \param afhi The structure to clear.
 226  *
 227  * The given pointer is kept, everything else is freed.
 228  */
 229 void clear_afhi(struct afh_info *afhi)
 230 {
 231         if (!afhi)
 232                 return;
 233         free(afhi->chunk_table);
 234         free(afhi->techinfo);
 235         free(afhi->tags.artist);
 236         free(afhi->tags.title);
 237         free(afhi->tags.year);
 238         free(afhi->tags.album);
 239         free(afhi->tags.comment);
 240 }
 241
 242 /**
 243  * Get the name of the given audio format.
 244  *
 245  * \param i The audio format number.
 246  *
 247  * \return This returns a pointer to statically allocated memory so it
 248  * must not be freed by the caller.
 249  */
 250 const char *audio_format_name(int i)
 251 {
 252         if (i < 0 || i >= ARRAY_SIZE(afl) - 1)
 253                 return "???";
 254         return afl[i].name;
 255 }
 256
 257 /**
 258  * Get one chunk of audio data.
 259  *
 260  * \param chunk_num The number of the chunk to get.
 261  * \param afhi Describes the audio file.
 262  * \param map The memory mapped audio file.
 263  * \param buf Result pointer.
 264  * \param len The length of the chunk in bytes.
 265  *
 266  * Upon return, \a buf will point so memory inside \a map. The returned buffer
 267  * must therefore not be freed by the caller.
 268  */
 269 void afh_get_chunk(long unsigned chunk_num, struct afh_info *afhi,
 270                 void *map, const char **buf, size_t *len)
 271 {
 272         size_t pos = afhi->chunk_table[chunk_num];
 273         *buf = map + pos;
 274         *len = afhi->chunk_table[chunk_num + 1] - pos;
 275 }
 276
 277 /**
 278  * Get the header of an audio file.
 279  *
 280  * \param afhi The audio file handler data describing the file.
 281  * \param audio_format_id Determines the audio format handler.
 282  * \param map The data of the audio file.
 283  * \param mapsize The amount of bytes of the mmapped audio file.
 284  * \param buf The length of the header is stored here.
 285  * \param len Points to a buffer containing the header on return.
 286  *
 287  * This function sets \a buf to \p NULL and \a len to zero if \a map or \a
 288  * afhi is \p NULL, or if the current audio format does not need special
 289  * header treatment.
 290  *
 291  * Otherwise, it is checked whether the audio format handler given by
 292  * \a audio_format_id defines a ->get_header() method. If it does, this
 293  * method is called to obtain the header. If ->get_header() is \p NULL,
 294  * a reference to the first chunk of the audio file is returned.
 295  *
 296  * Once the header is no longer needed, the caller must call \ref
 297  * afh_free_header() to free the resources allocated by this function.
 298  */
 299 void afh_get_header(struct afh_info *afhi, uint8_t audio_format_id,
 300                 void *map, size_t mapsize, char **buf, size_t *len)
 301 {
 302         struct audio_format_handler *afh = afl + audio_format_id;
 303
 304         if (!map || !afhi || !afhi->header_len) {
 305                 *buf = NULL;
 306                 *len = 0;
 307                 return;
 308         }
 309         if (!afh->get_header) {
 310                 *len = afhi->header_len;
 311                 *buf = map;
 312                 return;
 313         }
 314         afh->get_header(map, mapsize, buf, len);
 315 }
 316
 317 /**
 318  * Deallocate any resources obtained from afh_get_header().
 319  *
 320  * \param header_buf Pointer obtained via afh_get_header().
 321  * \param audio_format_id Determines the audio format handler.
 322  */
 323 void afh_free_header(char *header_buf, uint8_t audio_format_id)
 324 {
 325         struct audio_format_handler *afh = afl + audio_format_id;
 326
 327         if (afh->get_header)
 328                 free(header_buf);
 329 }
 330
 331 /**
 332  * Pretty-print the contents of a struct afh_info into a buffer.
 333  *
 334  * \param audio_format_num The audio format number.
 335  * \param afhi Pointer to the structure that contains the information.
 336  * \param result Pretty-printed ahfi is here after the call.
 337  *
 338  * The \a result buffer is dynamically allocated and should be freed by the
 339  * caller.
 340  *
 341  * \return The number of bytes. This function never fails.
 342  */
 343 unsigned afh_get_afhi_txt(int audio_format_num, struct afh_info *afhi, char **result)
 344 {
 345         return xasprintf(result, "%s: %dkbit/s\n" /* bitrate */
 346                 "%s: %s\n" /* format */
 347                 "%s: %dHz\n" /* frequency */
 348                 "%s: %d\n" /* channels */
 349                 "%s: %lu\n" /* seconds total */
 350                 "%s: %lu: %lu\n" /* chunk time */
 351                 "%s: %lu\n" /* num chunks */
 352                 "%s: %s\n" /* techinfo */
 353                 "%s: %s\n" /* artist */
 354                 "%s: %s\n" /* title */
 355                 "%s: %s\n" /* year */
 356                 "%s: %s\n" /* album */
 357                 "%s: %s\n", /* comment */
 358                 status_item_list[SI_BITRATE], afhi->bitrate,
 359                 status_item_list[SI_FORMAT], audio_format_name(audio_format_num),
 360                 status_item_list[SI_FREQUENCY], afhi->frequency,
 361                 status_item_list[SI_CHANNELS], afhi->channels,
 362                 status_item_list[SI_SECONDS_TOTAL], afhi->seconds_total,
 363                 status_item_list[SI_CHUNK_TIME], (long unsigned)afhi->chunk_tv.tv_sec,
 364                         (long unsigned)afhi->chunk_tv.tv_usec,
 365                 status_item_list[SI_NUM_CHUNKS], afhi->chunks_total,
 366                 status_item_list[SI_TECHINFO], afhi->techinfo? afhi->techinfo : "",
 367                 status_item_list[SI_ARTIST], afhi->tags.artist? afhi->tags.artist : "",
 368                 status_item_list[SI_TITLE], afhi->tags.title? afhi->tags.title : "",
 369                 status_item_list[SI_YEAR], afhi->tags.year? afhi->tags.year : "",
 370                 status_item_list[SI_ALBUM], afhi->tags.album? afhi->tags.album : "",
 371                 status_item_list[SI_COMMENT], afhi->tags.comment? afhi->tags.comment : ""
 372         );
 373 }