ogg_afh.c

   1 /*
   2  * Copyright (C) 2004-2007 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 = PARA_MIN(ods->numbytes - ods->fpos, size * nmemb),
  38                 ret = copy / size;
  39         if (!ret)
  40                 return 0;
  41         memcpy(buf, ods->map + ods->fpos, copy);
  42 //      PARA_INFO_LOG("size: %zd, nmemb: %zd, ret: %zd\n", size, nmemb, ret);
  43         ods->fpos += ret * size;
  44         return ret;
  45 }
  46
  47 static int cb_seek(void *datasource, ogg_int64_t offset,
  48                 int whence)
  49 {
  50         struct ogg_datasource *ods = datasource;
  51         switch (whence) {
  52         case SEEK_SET:
  53                 if (offset >= 0 && offset <= ods->numbytes) {
  54                         ods->fpos = offset;
  55                         return 0;
  56                 }
  57                 errno = EINVAL;
  58                 return -1;
  59                 break;
  60         case SEEK_END:
  61                 if (offset <= 0 && -offset <= ods->numbytes) {
  62                         ods->fpos = ods->numbytes + offset;
  63                         return 0;
  64                 }
  65                 errno = EINVAL;
  66                 return -1;
  67                 break;
  68         case SEEK_CUR:
  69                 if ((offset >= 0 && offset + ods->fpos > ods->numbytes) ||
  70                                 (offset < 0 && offset + ods->fpos < 0)) {
  71                         errno = EINVAL;
  72                         return -1;
  73                 }
  74                 ods->fpos += offset;
  75                 return 0;
  76         }
  77         errno = EINVAL;
  78         return -1;
  79 }
  80
  81 /* don't do anything as vss still needs the open filehandle */
  82 static int cb_close(__a_unused void *datasource)
  83 {
  84         return 0;
  85 }
  86
  87 static long cb_tell(void *datasource)
  88 {
  89         struct ogg_datasource *ods = datasource;
  90         return (unsigned long)ods->fpos;
  91 }
  92
  93 static int ogg_open_callbacks(void *datasource, OggVorbis_File *vf, ov_callbacks c)
  94 {
  95         int ret = ov_open_callbacks(datasource, vf,
  96                 NULL, /* no initial buffer */
  97                 0, /* no initial bytes */
  98                 c); /* the ov_open_callbacks */
  99
 100         if (ret == OV_EREAD)
 101                 return -E_OGG_READ;
 102         if (ret == OV_ENOTVORBIS)
 103                 return -E_VORBIS;
 104         if (ret == OV_EVERSION)
 105                 return -E_OGG_VERSION;
 106         if (ret == OV_EBADHEADER)
 107                 return -E_OGG_BAD_HEADER;
 108         if (ret < 0)
 109                 return -E_OGG_UNKNOWN_ERROR;
 110         return 1;
 111
 112 }
 113
 114 static int ogg_compute_header_len(char *map, size_t numbytes,
 115                 struct afh_info *afhi)
 116 {
 117         int ret;
 118         size_t len = PARA_MIN(numbytes, CHUNK_SIZE);
 119         int serial;
 120         char *buf;
 121
 122         ogg_page page;
 123         ogg_packet packet;
 124         vorbis_comment vc;
 125         vorbis_info vi;
 126         ogg_stream_state *stream_in = para_malloc(sizeof(ogg_stream_state));
 127         ogg_stream_state *stream_out = para_malloc(sizeof(ogg_stream_state));
 128         ogg_sync_state *sync_in = para_malloc(sizeof(ogg_sync_state));
 129
 130         ogg_sync_init(sync_in);
 131         vorbis_info_init(&vi);
 132         vorbis_comment_init(&vc);
 133         buf = ogg_sync_buffer(sync_in, (long)len);
 134         memcpy(buf, map, len);
 135         ogg_sync_wrote(sync_in, (long)len);
 136         ret = -E_SYNC_PAGEOUT;
 137         if (ogg_sync_pageout(sync_in, &page) <= 0) {
 138                 free(stream_in);
 139                 free(stream_out);
 140                 goto err1;
 141         }
 142         serial = ogg_page_serialno(&page);
 143         ogg_stream_init(stream_in, serial);
 144         ogg_stream_init(stream_out, serial);
 145         ret = ogg_stream_pagein(stream_in, &page);
 146         if (ret < 0) {
 147                 ret = -E_STREAM_PAGEIN;
 148                 goto err2;
 149         }
 150         ret = ogg_stream_packetout(stream_in, &packet);
 151         if (ret != 1) {
 152                 ret = -E_STREAM_PACKETOUT;
 153                 goto err2;
 154         }
 155         ret = -E_VORBIS;
 156         if (vorbis_synthesis_headerin(&vi, &vc, &packet) < 0)
 157                 goto err2;
 158         PARA_DEBUG_LOG("channels: %i, rate: %li\n", vi.channels, vi.rate);
 159         ogg_stream_packetin(stream_out, &packet);
 160
 161         ret = ogg_sync_pageout(sync_in, &page);
 162         if (ret <= 0) {
 163                 ret = -E_SYNC_PAGEOUT;
 164                 goto err2;
 165         }
 166         ogg_stream_pagein(stream_in, &page);
 167         ogg_stream_packetout(stream_in, &packet);
 168         ogg_stream_packetin(stream_out, &packet);
 169
 170         ret = ogg_sync_pageout(sync_in, &page);
 171         if (ret <= 0) {
 172                 ret = -E_SYNC_PAGEOUT;
 173                 goto err2;
 174         }
 175         ogg_stream_pagein(stream_in, &page);
 176         ogg_stream_packetout(stream_in, &packet);
 177         ogg_stream_packetin(stream_out, &packet);
 178
 179         afhi->header_len = 0;
 180         while (ogg_stream_flush(stream_out, &page))
 181                 afhi->header_len += page.body_len + page.header_len;
 182         PARA_DEBUG_LOG("header_len = %d\n", afhi->header_len);
 183         afhi->header_offset = 0;
 184         ret = 1;
 185 err2:
 186         ogg_stream_destroy(stream_in);
 187         ogg_stream_destroy(stream_out);
 188 err1:
 189         ogg_sync_destroy(sync_in);
 190         vorbis_info_clear(&vi);
 191         vorbis_comment_clear(&vc);
 192         return ret;
 193 }
 194
 195 /*
 196  * Alloc and fill array table of byte offsets. chunk_table[i] is the
 197  * offset in the current input file at which the sample containing time i *
 198  * CHUNK_TIME begins. Always successful.
 199  */
 200 static long unsigned ogg_compute_chunk_table(OggVorbis_File *of,
 201         struct afh_info *afhi, long unsigned time_total)
 202 {
 203         int i, ret, num;
 204         ssize_t max_chunk_len, pos = 0, min = 0, old_pos;
 205         long unsigned num_chunks;
 206
 207         old_pos = 0;
 208         ret = 0;
 209         num = time_total / chunk_time + 3;
 210         PARA_DEBUG_LOG("chunk time: %g allocating %d chunk pointers\n",
 211                 chunk_time, num);
 212         afhi->chunk_table = para_malloc((num + 1) * sizeof(size_t));
 213         afhi->chunk_table[0] = 0;
 214         max_chunk_len = 0;
 215         for (i = 1; ret <= num; i++) {
 216                 ogg_int64_t diff;
 217                 ret = ov_time_seek(of, i * chunk_time);
 218                 if (ret)
 219                         break;
 220                 pos = ov_raw_tell(of);
 221                 diff = pos - old_pos;
 222                 max_chunk_len = PARA_MAX(max_chunk_len, diff);
 223                 min = (i == 1)? diff : PARA_MIN(min, diff);
 224                 afhi->chunk_table[i] = pos;
 225 //              if (i < 11 || !((i - 1) % 1000)|| i > num - 11)
 226 //                      PARA_DEBUG_LOG("chunk #%d: %g secs, pos: %zd, "
 227 //                              "size: %zd\n", i - 1,
 228 //                              i * chunk_time, pos, pos - old_pos);
 229                 old_pos = pos;
 230         }
 231         num_chunks = i - 1;
 232 //fi->chunk_table[i] = pos;
 233         PARA_DEBUG_LOG("%lu chunks (%fs), max chunk: %zd, min chunk: %zd\n",
 234                 num_chunks, chunk_time, max_chunk_len, min);
 235         return num_chunks;
 236 }
 237
 238 /*
 239  * Init oggvorbis file and write some tech data to given pointers.
 240  */
 241 static int ogg_get_file_info(char *map, size_t numbytes,
 242                 struct afh_info *afhi)
 243 {
 244         int ret;
 245         vorbis_info *vi;
 246         OggVorbis_File of;
 247         const ov_callbacks ovc = {
 248                 .read_func = cb_read,
 249                 .seek_func = cb_seek,
 250                 .close_func = cb_close,
 251                 .tell_func = cb_tell
 252         };
 253         struct ogg_datasource ods = {.map = map, .numbytes = numbytes, .fpos = 0};
 254
 255         ret = ogg_compute_header_len(map, numbytes, afhi);
 256         if (ret < 0)
 257                 return ret;
 258         ret = ogg_open_callbacks(&ods, &of, ovc);
 259         if (ret < 0)
 260                 goto err;
 261         ret = -E_OGG_INFO;
 262         vi = ov_info(&of, 0);
 263         if (!vi)
 264                 goto err;
 265         afhi->seconds_total = ov_time_total(&of, -1);
 266         afhi->frequency = vi->rate;
 267         afhi->bitrate = ov_bitrate(&of, 0) / 1000;
 268         afhi->channels = vi->channels;
 269         afhi->chunks_total = ogg_compute_chunk_table(&of, afhi, afhi->seconds_total);
 270         sprintf(afhi->info_string, "audio_file_info1:%lu x %lu, %ukHz, "
 271                 "%d channels, %ukbps\n"
 272                 "audio_file_info2: \n"
 273                 "audio_file_info3: \n",
 274                 afhi->chunks_total, (long unsigned) (chunk_time * 1000 * 1000),
 275                 afhi->frequency / 1000, vi->channels, afhi->bitrate
 276                 );
 277         afhi->chunk_tv.tv_sec = 0;
 278         afhi->chunk_tv.tv_usec = 250 * 1000;
 279         tv_scale(3, &afhi->chunk_tv, &afhi->eof_tv);
 280         ret = 1;
 281 err:
 282         ov_clear(&of); /* keeps the file open */
 283         return ret;
 284 }
 285
 286 static const char* ogg_suffixes[] = {"ogg", NULL};
 287
 288 /**
 289  * the init function of the ogg vorbis audio format handler
 290  *
 291  * \param afh pointer to the struct to initialize
 292  */
 293 void ogg_init(struct audio_format_handler *afh)
 294 {
 295         afh->get_file_info = ogg_get_file_info,
 296         afh->suffixes = ogg_suffixes;
 297 }