ogg_afh.c

   1 /*
   2  * Copyright (C) 2004-2009 Andre Noll <maan@systemlinux.org>
   3  *
   4  * Licensed under the GPL v2. For licencing details see COPYING.
   5  */
   6 /** \file ogg_afh.c para_server's ogg vorbis audio format handler */
   7
   8 #include <regex.h>
   9 #include <inttypes.h>
  10 #include <ogg/ogg.h>
  11 #include <vorbis/codec.h>
  12 #include <vorbis/vorbisfile.h>
  13
  14 #include "para.h"
  15 #include "error.h"
  16 #include "afh.h"
  17 #include "string.h"
  18
  19 /** must be big enough to hold header */
  20 #define CHUNK_SIZE 32768
  21 static double chunk_time = 0.25;
  22
  23 /** describes a memory-mapped ogg vorbis file */
  24 struct ogg_datasource {
  25         /** the memory mapping */
  26         char *map;
  27         /** this size of the mapping */
  28         off_t numbytes;
  29         /** the current position in the mapping */
  30         off_t fpos;
  31 };
  32
  33 static size_t cb_read(void *buf, size_t size, size_t nmemb, void *datasource)
  34 {
  35         struct ogg_datasource *ods = datasource;
  36         size_t copy, ret;
  37
  38         if (!size)
  39                 return 0;
  40
  41         assert(ods->numbytes >= ods->fpos);
  42         ret = ods->numbytes - ods->fpos;
  43         copy = PARA_MIN(ret, size * nmemb);
  44         ret = copy / size;
  45         if (!ret)
  46                 return 0;
  47         memcpy(buf, ods->map + ods->fpos, copy);
  48 //      PARA_INFO_LOG("size: %zd, nmemb: %zd, ret: %zd\n", size, nmemb, ret);
  49         ods->fpos += ret * size;
  50         return ret;
  51 }
  52
  53 static int cb_seek(void *datasource, ogg_int64_t offset,
  54                 int whence)
  55 {
  56         struct ogg_datasource *ods = datasource;
  57         switch (whence) {
  58         case SEEK_SET:
  59                 if (offset >= 0 && offset <= ods->numbytes) {
  60                         ods->fpos = offset;
  61                         return 0;
  62                 }
  63                 errno = EINVAL;
  64                 return -1;
  65                 break;
  66         case SEEK_END:
  67                 if (offset <= 0 && -offset <= ods->numbytes) {
  68                         ods->fpos = ods->numbytes + offset;
  69                         return 0;
  70                 }
  71                 errno = EINVAL;
  72                 return -1;
  73                 break;
  74         case SEEK_CUR:
  75                 if ((offset >= 0 && offset + ods->fpos > ods->numbytes) ||
  76                                 (offset < 0 && offset + ods->fpos < 0)) {
  77                         errno = EINVAL;
  78                         return -1;
  79                 }
  80                 ods->fpos += offset;
  81                 return 0;
  82         }
  83         errno = EINVAL;
  84         return -1;
  85 }
  86
  87 /* don't do anything as vss still needs the open filehandle */
  88 static int cb_close(__a_unused void *datasource)
  89 {
  90         return 0;
  91 }
  92
  93 static long cb_tell(void *datasource)
  94 {
  95         struct ogg_datasource *ods = datasource;
  96         return (unsigned long)ods->fpos;
  97 }
  98
  99 static int ogg_open_callbacks(void *datasource, OggVorbis_File *vf, ov_callbacks c)
 100 {
 101         int ret = ov_open_callbacks(datasource, vf,
 102                 NULL, /* no initial buffer */
 103                 0, /* no initial bytes */
 104                 c); /* the ov_open_callbacks */
 105
 106         if (ret == OV_EREAD)
 107                 return -E_OGG_READ;
 108         if (ret == OV_ENOTVORBIS)
 109                 return -E_VORBIS;
 110         if (ret == OV_EVERSION)
 111                 return -E_OGG_VERSION;
 112         if (ret == OV_EBADHEADER)
 113                 return -E_OGG_BAD_HEADER;
 114         if (ret < 0)
 115                 return -E_OGG_UNKNOWN_ERROR;
 116         return 1;
 117
 118 }
 119
 120 static int ogg_compute_header_len(char *map, size_t numbytes,
 121                 struct afh_info *afhi)
 122 {
 123         int ret;
 124         size_t len = PARA_MIN(numbytes, (size_t)CHUNK_SIZE);
 125         int serial;
 126         char *buf;
 127
 128         ogg_page page;
 129         ogg_packet packet;
 130         vorbis_comment vc;
 131         vorbis_info vi;
 132         ogg_stream_state *stream_in = para_malloc(sizeof(ogg_stream_state));
 133         ogg_stream_state *stream_out = para_malloc(sizeof(ogg_stream_state));
 134         ogg_sync_state *sync_in = para_malloc(sizeof(ogg_sync_state));
 135
 136         ogg_sync_init(sync_in);
 137         vorbis_info_init(&vi);
 138         vorbis_comment_init(&vc);
 139         buf = ogg_sync_buffer(sync_in, (long)len);
 140         memcpy(buf, map, len);
 141         ogg_sync_wrote(sync_in, (long)len);
 142         ret = -E_SYNC_PAGEOUT;
 143         if (ogg_sync_pageout(sync_in, &page) <= 0) {
 144                 free(stream_in);
 145                 free(stream_out);
 146                 goto err1;
 147         }
 148         serial = ogg_page_serialno(&page);
 149         ogg_stream_init(stream_in, serial);
 150         ogg_stream_init(stream_out, serial);
 151         ret = ogg_stream_pagein(stream_in, &page);
 152         if (ret < 0) {
 153                 ret = -E_STREAM_PAGEIN;
 154                 goto err2;
 155         }
 156         ret = ogg_stream_packetout(stream_in, &packet);
 157         if (ret != 1) {
 158                 ret = -E_STREAM_PACKETOUT;
 159                 goto err2;
 160         }
 161         ret = -E_VORBIS;
 162         if (vorbis_synthesis_headerin(&vi, &vc, &packet) < 0)
 163                 goto err2;
 164         PARA_DEBUG_LOG("channels: %i, rate: %li\n", vi.channels, vi.rate);
 165         ogg_stream_packetin(stream_out, &packet);
 166         ret = ogg_sync_pageout(sync_in, &page);
 167         if (ret <= 0) {
 168                 ret = -E_SYNC_PAGEOUT;
 169                 goto err2;
 170         }
 171         ogg_stream_pagein(stream_in, &page);
 172         ogg_stream_packetout(stream_in, &packet);
 173         ogg_stream_packetin(stream_out, &packet);
 174
 175         ret = ogg_sync_pageout(sync_in, &page);
 176         if (ret <= 0) {
 177                 ret = -E_SYNC_PAGEOUT;
 178                 goto err2;
 179         }
 180         ogg_stream_pagein(stream_in, &page);
 181         ogg_stream_packetout(stream_in, &packet);
 182         ogg_stream_packetin(stream_out, &packet);
 183
 184         afhi->header_len = 0;
 185         while (ogg_stream_flush(stream_out, &page))
 186                 afhi->header_len += page.body_len + page.header_len;
 187         PARA_DEBUG_LOG("header_len = %d\n", afhi->header_len);
 188         afhi->header_offset = 0;
 189         ret = 1;
 190 err2:
 191         ogg_stream_destroy(stream_in);
 192         ogg_stream_destroy(stream_out);
 193 err1:
 194         ogg_sync_destroy(sync_in);
 195         vorbis_info_clear(&vi);
 196         vorbis_comment_clear(&vc);
 197         return ret;
 198 }
 199
 200 /*
 201  * Alloc and fill array table of byte offsets. chunk_table[i] is the
 202  * offset in the current input file at which the sample containing time i *
 203  * CHUNK_TIME begins. Always successful.
 204  */
 205 static long unsigned ogg_compute_chunk_table(OggVorbis_File *of,
 206         struct afh_info *afhi, long unsigned time_total)
 207 {
 208         int i, ret, num;
 209         long unsigned num_chunks;
 210         ogg_int64_t max = 0, min = 0, old_pos = 0;
 211
 212         num = time_total / chunk_time + 3;
 213         PARA_DEBUG_LOG("chunk time: %g allocating %d chunk pointers\n",
 214                 chunk_time, num);
 215         afhi->chunk_table = para_malloc((num + 1) * sizeof(size_t));
 216         afhi->chunk_table[0] = 0;
 217         for (i = 1; i <= num; i++) {
 218                 ogg_int64_t diff, pos;
 219                 ret = ov_time_seek(of, i * chunk_time);
 220                 if (ret)
 221                         break;
 222                 pos = ov_raw_tell(of);
 223                 diff = pos - old_pos;
 224                 max = PARA_MAX(max, diff);
 225                 min = (i == 1)? diff : PARA_MIN(min, diff);
 226                 afhi->chunk_table[i] = pos;
 227                 old_pos = pos;
 228         }
 229         num_chunks = i - 1;
 230         PARA_DEBUG_LOG("%lu chunks (%fs), max chunk: %lld, min chunk: %lld\n",
 231                 num_chunks, chunk_time, (long long)max, (long long)min);
 232         return num_chunks;
 233 }
 234
 235 static void ogg_get_vorbis_comments(OggVorbis_File *vf, struct afh_info *afhi)
 236 {
 237         vorbis_comment *vc = ov_comment(vf,-1);
 238
 239         if (!vc)
 240                 return;
 241         afhi->tags.artist = para_strdup(vorbis_comment_query(vc, "artist", 0));
 242         afhi->tags.title = para_strdup(vorbis_comment_query(vc, "title", 0));
 243         afhi->tags.album = para_strdup(vorbis_comment_query(vc, "album", 0));
 244         afhi->tags.year = para_strdup(vorbis_comment_query(vc, "year", 0));
 245         afhi->tags.comment = para_strdup(vorbis_comment_query(vc, "comment", 0));
 246 }
 247
 248 /*
 249  * Init oggvorbis file and write some tech data to given pointers.
 250  */
 251 static int ogg_get_file_info(char *map, size_t numbytes, __a_unused int fd,
 252                 struct afh_info *afhi)
 253 {
 254         int ret;
 255         vorbis_info *vi;
 256         OggVorbis_File of;
 257         const ov_callbacks ovc = {
 258                 .read_func = cb_read,
 259                 .seek_func = cb_seek,
 260                 .close_func = cb_close,
 261                 .tell_func = cb_tell
 262         };
 263         struct ogg_datasource ods = {.map = map, .numbytes = numbytes, .fpos = 0};
 264
 265         ret = ogg_compute_header_len(map, numbytes, afhi);
 266         if (ret < 0)
 267                 return ret;
 268         ret = ogg_open_callbacks(&ods, &of, ovc);
 269         if (ret < 0)
 270                 goto err;
 271         ret = -E_OGG_INFO;
 272         vi = ov_info(&of, 0);
 273         if (!vi)
 274                 goto err;
 275         afhi->seconds_total = ov_time_total(&of, -1);
 276         afhi->frequency = vi->rate;
 277         afhi->bitrate = ov_bitrate(&of, 0) / 1000;
 278         afhi->channels = vi->channels;
 279         afhi->chunks_total = ogg_compute_chunk_table(&of, afhi, afhi->seconds_total);
 280         afhi->chunk_tv.tv_sec = 0;
 281         afhi->chunk_tv.tv_usec = 250 * 1000;
 282         ogg_get_vorbis_comments(&of, afhi);
 283         ret = 1;
 284 err:
 285         ov_clear(&of); /* keeps the file open */
 286         return ret;
 287 }
 288
 289 static const char* ogg_suffixes[] = {"ogg", NULL};
 290
 291 /**
 292  * the init function of the ogg vorbis audio format handler
 293  *
 294  * \param afh pointer to the struct to initialize
 295  */
 296 void ogg_init(struct audio_format_handler *afh)
 297 {
 298         afh->get_file_info = ogg_get_file_info,
 299         afh->suffixes = ogg_suffixes;
 300 }