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