afh_common.c

   1 /*
   2  * Copyright (C) 1997-2011 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/time.h> /* gettimeofday */
  11 #include <sys/types.h>
  12 #include <regex.h>
  13
  14 #include "para.h"
  15 #include "error.h"
  16 #include "string.h"
  17 #include "afh.h"
  18
  19 /* The mp3 audio format handler does not need any libs. */
  20 void mp3_init(struct audio_format_handler *);
  21
  22 #ifdef HAVE_OGGVORBIS
  23         void ogg_init(struct audio_format_handler *);
  24 #endif
  25 #ifdef HAVE_FAAD
  26         void aac_afh_init(struct audio_format_handler *);
  27 #endif
  28 #ifdef HAVE_SPEEX
  29         void spx_afh_init(struct audio_format_handler *);
  30 #endif
  31 #ifdef HAVE_FLAC
  32         void flac_afh_init(struct audio_format_handler *);
  33 #endif
  34
  35 void wma_afh_init(struct audio_format_handler *);
  36 /**
  37  * The list of supported audio formats.
  38  *
  39  * We always define the full array of audio formats even if some audio formats
  40  * were not compiled in. This is because for each audio file the number of its
  41  * audio format is stored in the database. We don't want that numbers to become
  42  * stale just because the user installed a new version of paraslash that
  43  * supports a different set of audio formats.
  44  *
  45  * It can still be easily detected whether an audio format is compiled in by
  46  * checking if the init function pointer is not \p NULL.
  47  */
  48 static struct audio_format_handler afl[] = {
  49         {
  50                 .name = "mp3",
  51                 .init = mp3_init,
  52         },
  53         {
  54                 .name = "ogg",
  55 #ifdef HAVE_OGGVORBIS
  56                 .init = ogg_init,
  57 #endif
  58         },
  59         {
  60                 .name = "aac",
  61 #ifdef HAVE_FAAD
  62                 .init = aac_afh_init,
  63 #endif
  64         },
  65         {
  66                 .name = "wma",
  67                 .init = wma_afh_init,
  68         },
  69         {
  70                 .name = "spx",
  71 #ifdef HAVE_SPEEX
  72                 .init = spx_afh_init,
  73 #endif
  74         },
  75         {
  76                 .name = "flac",
  77 #ifdef HAVE_FLAC
  78                 .init = flac_afh_init,
  79 #endif
  80         },
  81         {
  82                 .name = NULL,
  83         }
  84 };
  85
  86 static inline int next_audio_format(int format)
  87 {
  88         for (;;) {
  89                 if (!afl[format].name)
  90                         return format;
  91                 format++;
  92                 if (afl[format].init)
  93                         return format;
  94         }
  95
  96 }
  97
  98 /** Iterate over each supported audio format. */
  99 #define FOR_EACH_AUDIO_FORMAT(i) for (i = 0; afl[i].name; i = next_audio_format(i))
 100
 101 /**
 102  * Call the init function of each supported audio format handler.
 103  */
 104 void afh_init(void)
 105 {
 106         int i;
 107
 108         PARA_INFO_LOG("supported audio formats: %s\n",
 109                 SERVER_AUDIO_FORMATS);
 110         FOR_EACH_AUDIO_FORMAT(i) {
 111                 PARA_NOTICE_LOG("initializing %s handler\n",
 112                         audio_format_name(i));
 113                 afl[i].init(&afl[i]);
 114         }
 115 }
 116
 117 /**
 118  * Guess the audio format judging from filename.
 119  *
 120  * \param name The filename.
 121  *
 122  * \return This function returns \p -E_AUDIO_FORMAT if it has no idea what kind
 123  * of audio file this might be. Otherwise the (non-negative) number of the
 124  * audio format is returned.
 125  */
 126 int guess_audio_format(const char *name)
 127 {
 128         int i,j, len = strlen(name);
 129
 130         FOR_EACH_AUDIO_FORMAT(i) {
 131                 for (j = 0; afl[i].suffixes[j]; j++) {
 132                         const char *p = afl[i].suffixes[j];
 133                         int plen = strlen(p);
 134                         if (len < plen + 1)
 135                                 continue;
 136                         if (name[len - plen - 1] != '.')
 137                                 continue;
 138                         if (strcasecmp(name + len - plen, p))
 139                                 continue;
 140 //                      PARA_DEBUG_LOG("might be %s\n", audio_format_name(i));
 141                         return i;
 142                 }
 143         }
 144         return -E_AUDIO_FORMAT;
 145 }
 146
 147 /**
 148  * Call get_file_info() to obtain an afhi structure.
 149  *
 150  * \param path The full path of the audio file.
 151  * \param data Pointer to the contents of the (mapped) file.
 152  * \param size The file size in bytes.
 153  * \param fd The open file descriptor.
 154  * \param afhi Result pointer.
 155  *
 156  * \return The number of the audio format on success, \p -E_AUDIO_FORMAT if no
 157  * compiled in audio format handler is able to handler the file.
 158  *
 159  * This function tries to find an audio format handler that can interpret the
 160  * file given by \a data and \a size.
 161  *
 162  * It first tries to determine the audio format from the filename given by \a
 163  * path. If this doesn't work, all other audio format handlers are tried until
 164  * one is found that can handle the file.
 165  */
 166 int compute_afhi(const char *path, char *data, size_t size, int fd,
 167                 struct afh_info *afhi)
 168 {
 169         int ret, i, format;
 170
 171         afhi->header_len = 0;
 172         afhi->techinfo = NULL;
 173         afhi->tags.artist = NULL;
 174         afhi->tags.title = NULL;
 175         afhi->tags.year = NULL;
 176         afhi->tags.album = NULL;
 177         afhi->tags.comment = NULL;
 178         format = guess_audio_format(path);
 179
 180         if (format >= 0) {
 181                 ret = afl[format].get_file_info(data, size, fd, afhi);
 182                 if (ret >= 0) {
 183                         ret = format;
 184                         goto success;
 185                 }
 186         }
 187         FOR_EACH_AUDIO_FORMAT(i) {
 188                 if (i == format) /* we already tried this one to no avail */
 189                         continue;
 190                 ret = afl[i].get_file_info(data, size, fd, afhi);
 191                 if (ret >= 0) {
 192                         ret = i;
 193                         goto success;
 194                 }
 195                 PARA_WARNING_LOG("%s\n", para_strerror(-ret));
 196         }
 197         return -E_AUDIO_FORMAT;
 198 success:
 199         if (!afhi->techinfo)
 200                 afhi->techinfo = para_strdup(NULL);
 201         if (!afhi->tags.artist)
 202                 afhi->tags.artist = para_strdup(NULL);
 203         if (!afhi->tags.title)
 204                 afhi->tags.title = para_strdup(NULL);
 205         if (!afhi->tags.year)
 206                 afhi->tags.year = para_strdup(NULL);
 207         if (!afhi->tags.album)
 208                 afhi->tags.album = para_strdup(NULL);
 209         if (!afhi->tags.comment)
 210                 afhi->tags.comment = para_strdup(NULL);
 211         PARA_DEBUG_LOG("techinfo: %s\n", afhi->techinfo);
 212         PARA_DEBUG_LOG("artist: %s\n", afhi->tags.artist);
 213         PARA_DEBUG_LOG("title: %s\n", afhi->tags.title);
 214         PARA_DEBUG_LOG("year: %s\n", afhi->tags.year);
 215         PARA_DEBUG_LOG("album: %s\n", afhi->tags.album);
 216         PARA_DEBUG_LOG("comment: %s\n", afhi->tags.comment);
 217         return ret;
 218 }
 219
 220 /**
 221  * Get the name of the given audio format.
 222  *
 223  * \param i The audio format number.
 224  *
 225  * \return This returns a pointer to statically allocated memory so it
 226  * must not be freed by the caller.
 227  */
 228 const char *audio_format_name(int i)
 229 {
 230         if (i < 0 || i >= ARRAY_SIZE(afl) - 1)
 231                 return "???";
 232         return afl[i].name;
 233 }
 234
 235 /**
 236  * Get one chunk of audio data.
 237  *
 238  * \param chunk_num The number of the chunk to get.
 239  * \param afhi Describes the audio file.
 240  * \param map The memory mapped audio file.
 241  * \param buf Result pointer.
 242  * \param len The length of the chunk in bytes.
 243  *
 244  * Upon return, \a buf will point so memory inside \a map. The returned buffer
 245  * must therefore not be freed by the caller.
 246  */
 247 void afh_get_chunk(long unsigned chunk_num, struct afh_info *afhi,
 248                 void *map, const char **buf, size_t *len)
 249 {
 250         size_t pos = afhi->chunk_table[chunk_num];
 251         *buf = map + pos;
 252         *len = afhi->chunk_table[chunk_num + 1] - pos;
 253 }
 254
 255 /**
 256  * Get the header of an audio file.
 257  *
 258  * \param afhi The audio file handler data describing the file.
 259  * \param audio_format_id Determines the audio format handler.
 260  * \param map The data of the audio file.
 261  * \param mapsize The amount of bytes of the mmapped audio file.
 262  * \param buf The length of the header is stored here.
 263  * \param len Points to a buffer containing the header on return.
 264  *
 265  * This function sets \a buf to \p NULL and \a len to zero if \a map or \a
 266  * afhi is \p NULL, or if the current audio format does not need special
 267  * header treatment.
 268  *
 269  * Otherwise, it is checked whether the audio format handler given by
 270  * \a audio_format_id defines a ->get_header() method. If it does, this
 271  * method is called to obtain the header. If ->get_header() is \p NULL,
 272  * a reference to the first chunk of the audio file is returned.
 273  *
 274  * Once the header is no longer needed, the caller must call \ref
 275  * afh_free_header() to free the resources allocated by this function.
 276  */
 277 void afh_get_header(struct afh_info *afhi, uint8_t audio_format_id,
 278                 void *map, size_t mapsize, char **buf, size_t *len)
 279 {
 280         struct audio_format_handler *afh = afl + audio_format_id;
 281
 282         if (!map || !afhi || !afhi->header_len) {
 283                 *buf = NULL;
 284                 *len = 0;
 285                 return;
 286         }
 287         if (!afh->get_header) {
 288                 *len = afhi->header_len;
 289                 *buf = map;
 290                 return;
 291         }
 292         afh->get_header(map, mapsize, buf, len);
 293 }
 294
 295 /**
 296  * Deallocate any resources obtained from afh_get_header().
 297  *
 298  * \param header_buf Pointer obtained via afh_get_header().
 299  * \param audio_format_id Determines the audio format handler.
 300  */
 301 void afh_free_header(char *header_buf, uint8_t audio_format_id)
 302 {
 303         struct audio_format_handler *afh = afl + audio_format_id;
 304
 305         if (afh->get_header)
 306                 free(header_buf);
 307 }