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 <inttypes.h>
   9 #include <ogg/ogg.h>
  10 #include <vorbis/codec.h>
  11 #include <vorbis/vorbisfile.h>
  12
  13 #include "para.h"
  14 #include "afh.h"
  15 #include "error.h"
  16 #include "string.h"
  17 #include "afs.h"
  18 #include "server.h"
  19
  20 /** must be big enough to hold header */
  21 #define CHUNK_SIZE 32768
  22 static double chunk_time = 0.25;
  23
  24 /** describes a memory-mapped ogg vorbis file */
  25 struct ogg_datasource {
  26         /** the memory mapping */
  27         char *map;
  28         /** this size of the mapping */
  29         off_t numbytes;
  30         /** the current position in the mapping */
  31         off_t fpos;
  32 };
  33
  34 static size_t cb_read(void *buf, size_t size, size_t nmemb, void *datasource)
  35 {
  36         struct ogg_datasource *ods = datasource;
  37         size_t copy, ret;
  38
  39         if (!size)
  40                 return 0;
  41
  42         assert(ods->numbytes >= ods->fpos);
  43         ret = ods->numbytes - ods->fpos;
  44         copy = PARA_MIN(ret, size * nmemb);
  45         ret = copy / size;
  46         if (!ret)
  47                 return 0;
  48         memcpy(buf, ods->map + ods->fpos, copy);
  49 //      PARA_INFO_LOG("size: %zd, nmemb: %zd, ret: %zd\n", size, nmemb, ret);
  50         ods->fpos += ret * size;
  51         return ret;
  52 }
  53
  54 static int cb_seek(void *datasource, ogg_int64_t offset,
  55                 int whence)
  56 {
  57         struct ogg_datasource *ods = datasource;
  58         switch (whence) {
  59         case SEEK_SET:
  60                 if (offset >= 0 && offset <= ods->numbytes) {
  61                         ods->fpos = offset;
  62                         return 0;
  63                 }
  64                 errno = EINVAL;
  65                 return -1;
  66                 break;
  67         case SEEK_END:
  68                 if (offset <= 0 && -offset <= ods->numbytes) {
  69                         ods->fpos = ods->numbytes + offset;
  70                         return 0;
  71                 }
  72                 errno = EINVAL;
  73                 return -1;
  74                 break;
  75         case SEEK_CUR:
  76                 if ((offset >= 0 && offset + ods->fpos > ods->numbytes) ||
  77                                 (offset < 0 && offset + ods->fpos < 0)) {
  78                         errno = EINVAL;
  79                         return -1;
  80                 }
  81                 ods->fpos += offset;
  82                 return 0;
  83         }
  84         errno = EINVAL;
  85         return -1;
  86 }
  87
  88 /* don't do anything as vss still needs the open filehandle */
  89 static int cb_close(__a_unused void *datasource)
  90 {
  91         return 0;
  92 }
  93
  94 static long cb_tell(void *datasource)
  95 {
  96         struct ogg_datasource *ods = datasource;
  97         return (unsigned long)ods->fpos;
  98 }
  99
 100 static int ogg_open_callbacks(void *datasource, OggVorbis_File *vf, ov_callbacks c)
 101 {
 102         int ret = ov_open_callbacks(datasource, vf,
 103                 NULL, /* no initial buffer */
 104                 0, /* no initial bytes */
 105                 c); /* the ov_open_callbacks */
 106
 107         if (ret == OV_EREAD)
 108                 return -E_OGG_READ;
 109         if (ret == OV_ENOTVORBIS)
 110                 return -E_VORBIS;
 111         if (ret == OV_EVERSION)
 112                 return -E_OGG_VERSION;
 113         if (ret == OV_EBADHEADER)
 114                 return -E_OGG_BAD_HEADER;
 115         if (ret < 0)
 116                 return -E_OGG_UNKNOWN_ERROR;
 117         return 1;
 118
 119 }
 120
 121 static int ogg_compute_header_len(char *map, size_t numbytes,
 122                 struct afh_info *afhi)
 123 {
 124         int ret;
 125         size_t len = PARA_MIN(numbytes, (size_t)CHUNK_SIZE);
 126         int serial;
 127         char *buf;
 128
 129         ogg_page page;
 130         ogg_packet packet;
 131         vorbis_comment vc;
 132         vorbis_info vi;
 133         ogg_stream_state *stream_in = para_malloc(sizeof(ogg_stream_state));
 134         ogg_stream_state *stream_out = para_malloc(sizeof(ogg_stream_state));
 135         ogg_sync_state *sync_in = para_malloc(sizeof(ogg_sync_state));
 136
 137         ogg_sync_init(sync_in);
 138         vorbis_info_init(&vi);
 139         vorbis_comment_init(&vc);
 140         buf = ogg_sync_buffer(sync_in, (long)len);
 141         memcpy(buf, map, len);
 142         ogg_sync_wrote(sync_in, (long)len);
 143         ret = -E_SYNC_PAGEOUT;
 144         if (ogg_sync_pageout(sync_in, &page) <= 0) {
 145                 free(stream_in);
 146                 free(stream_out);
 147                 goto err1;
 148         }
 149         serial = ogg_page_serialno(&page);
 150         ogg_stream_init(stream_in, serial);
 151         ogg_stream_init(stream_out, serial);
 152         ret = ogg_stream_pagein(stream_in, &page);
 153         if (ret < 0) {
 154                 ret = -E_STREAM_PAGEIN;
 155                 goto err2;
 156         }
 157         ret = ogg_stream_packetout(stream_in, &packet);
 158         if (ret != 1) {
 159                 ret = -E_STREAM_PACKETOUT;
 160                 goto err2;
 161         }
 162         ret = -E_VORBIS;
 163         if (vorbis_synthesis_headerin(&vi, &vc, &packet) < 0)
 164                 goto err2;
 165         PARA_DEBUG_LOG("channels: %i, rate: %li\n", vi.channels, vi.rate);
 166         ogg_stream_packetin(stream_out, &packet);
 167         ret = ogg_sync_pageout(sync_in, &page);
 168         if (ret <= 0) {
 169                 ret = -E_SYNC_PAGEOUT;
 170                 goto err2;
 171         }
 172         ogg_stream_pagein(stream_in, &page);
 173         ogg_stream_packetout(stream_in, &packet);
 174         ogg_stream_packetin(stream_out, &packet);
 175
 176         ret = ogg_sync_pageout(sync_in, &page);
 177         if (ret <= 0) {
 178                 ret = -E_SYNC_PAGEOUT;
 179                 goto err2;
 180         }
 181         ogg_stream_pagein(stream_in, &page);
 182         ogg_stream_packetout(stream_in, &packet);
 183         ogg_stream_packetin(stream_out, &packet);
 184
 185         afhi->header_len = 0;
 186         while (ogg_stream_flush(stream_out, &page))
 187                 afhi->header_len += page.body_len + page.header_len;
 188         PARA_DEBUG_LOG("header_len = %d\n", afhi->header_len);
 189         afhi->header_offset = 0;
 190         ret = 1;
 191 err2:
 192         ogg_stream_destroy(stream_in);
 193         ogg_stream_destroy(stream_out);
 194 err1:
 195         ogg_sync_destroy(sync_in);
 196         vorbis_info_clear(&vi);
 197         vorbis_comment_clear(&vc);
 198         return ret;
 199 }
 200
 201 /*
 202  * Alloc and fill array table of byte offsets. chunk_table[i] is the
 203  * offset in the current input file at which the sample containing time i *
 204  * CHUNK_TIME begins. Always successful.
 205  */
 206 static long unsigned ogg_compute_chunk_table(OggVorbis_File *of,
 207         struct afh_info *afhi, long unsigned time_total)
 208 {
 209         int i, ret, num;
 210         long unsigned num_chunks;
 211         ogg_int64_t max = 0, min = 0, old_pos = 0;
 212
 213         num = time_total / chunk_time + 3;
 214         PARA_DEBUG_LOG("chunk time: %g allocating %d chunk pointers\n",
 215                 chunk_time, num);
 216         afhi->chunk_table = para_malloc((num + 1) * sizeof(size_t));
 217         afhi->chunk_table[0] = 0;
 218         for (i = 1; i <= num; i++) {
 219                 ogg_int64_t diff, pos;
 220                 ret = ov_time_seek(of, i * chunk_time);
 221                 if (ret)
 222                         break;
 223                 pos = ov_raw_tell(of);
 224                 diff = pos - old_pos;
 225                 max = PARA_MAX(max, diff);
 226                 min = (i == 1)? diff : PARA_MIN(min, diff);
 227                 afhi->chunk_table[i] = pos;
 228                 old_pos = pos;
 229         }
 230         num_chunks = i - 1;
 231         PARA_DEBUG_LOG("%lu chunks (%fs), max chunk: %lld, min chunk: %lld\n",
 232                 num_chunks, chunk_time, (long long)max, (long long)min);
 233         return num_chunks;
 234 }
 235
 236 static void ogg_write_info_string(OggVorbis_File *vf, struct afh_info *afhi)
 237 {
 238         char *taginfo;
 239         vorbis_comment *vc = ov_comment(vf,-1);
 240
 241         if (vc) {
 242                 char *artist, *title, *album, *year, *comment;
 243                 artist = vorbis_comment_query(vc, "artist", 0);
 244                 title = vorbis_comment_query(vc, "title", 0);
 245                 album = vorbis_comment_query(vc, "album", 0);
 246                 year = vorbis_comment_query(vc, "year", 0);
 247                 comment = vorbis_comment_query(vc, "comment", 0);
 248                 taginfo = make_taginfo(title, artist, album, year, comment);
 249         } else
 250                 taginfo = make_message("%s: (no vorbis comments found)\n%s:\n",
 251                         status_item_list[SI_TAGINFO1],
 252                         status_item_list[SI_TAGINFO2]);
 253         afhi->info_string = make_message("%s:\n%s",
 254                 status_item_list[SI_AUDIO_FILE_INFO], taginfo);
 255         free(taginfo);
 256 }
 257
 258 /*
 259  * Init oggvorbis file and write some tech data to given pointers.
 260  */
 261 static int ogg_get_file_info(char *map, size_t numbytes, __a_unused int fd,
 262                 struct afh_info *afhi)
 263 {
 264         int ret;
 265         vorbis_info *vi;
 266         OggVorbis_File of;
 267         const ov_callbacks ovc = {
 268                 .read_func = cb_read,
 269                 .seek_func = cb_seek,
 270                 .close_func = cb_close,
 271                 .tell_func = cb_tell
 272         };
 273         struct ogg_datasource ods = {.map = map, .numbytes = numbytes, .fpos = 0};
 274
 275         ret = ogg_compute_header_len(map, numbytes, afhi);
 276         if (ret < 0)
 277                 return ret;
 278         ret = ogg_open_callbacks(&ods, &of, ovc);
 279         if (ret < 0)
 280                 goto err;
 281         ret = -E_OGG_INFO;
 282         vi = ov_info(&of, 0);
 283         if (!vi)
 284                 goto err;
 285         afhi->seconds_total = ov_time_total(&of, -1);
 286         afhi->frequency = vi->rate;
 287         afhi->bitrate = ov_bitrate(&of, 0) / 1000;
 288         afhi->channels = vi->channels;
 289         afhi->chunks_total = ogg_compute_chunk_table(&of, afhi, afhi->seconds_total);
 290         afhi->chunk_tv.tv_sec = 0;
 291         afhi->chunk_tv.tv_usec = 250 * 1000;
 292         tv_scale(10 / afhi->channels, &afhi->chunk_tv, &afhi->eof_tv);
 293         ogg_write_info_string(&of, afhi);
 294         ret = 1;
 295 err:
 296         ov_clear(&of); /* keeps the file open */
 297         return ret;
 298 }
 299
 300 static const char* ogg_suffixes[] = {"ogg", NULL};
 301
 302 /**
 303  * the init function of the ogg vorbis audio format handler
 304  *
 305  * \param afh pointer to the struct to initialize
 306  */
 307 void ogg_init(struct audio_format_handler *afh)
 308 {
 309         afh->get_file_info = ogg_get_file_info,
 310         afh->suffixes = ogg_suffixes;
 311 }