ogg_afh.c

   1 /*
   2  * Copyright (C) 2004-2007 Andre Noll <maan@systemlinux.org>
   3  *
   4  *     This program is free software; you can redistribute it and/or modify
   5  *     it under the terms of the GNU General Public License as published by
   6  *     the Free Software Foundation; either version 2 of the License, or
   7  *     (at your option) any later version.
   8  *
   9  *     This program is distributed in the hope that it will be useful,
  10  *     but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  *     GNU General Public License for more details.
  13  *
  14  *     You should have received a copy of the GNU General Public License
  15  *     along with this program; if not, write to the Free Software
  16  *     Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  17  */
  18 /** \file ogg_afh.c para_server's ogg vorbis audio format handler */
  19
  20 #include <inttypes.h>
  21 #include <ogg/ogg.h>
  22 #include <vorbis/codec.h>
  23 #include <vorbis/vorbisfile.h>
  24
  25 #include "server.cmdline.h"
  26 #include "server.h"
  27 #include "vss.h"
  28 #include "error.h"
  29 #include "string.h"
  30
  31 /** must be big enough to hold header */
  32 #define CHUNK_SIZE 32768
  33 static double chunk_time = 0.25;
  34
  35 struct ogg_datasource {
  36         char *map;
  37         off_t numbytes;
  38         off_t fpos;
  39 };
  40
  41 static size_t cb_read(void *buf, size_t size, size_t nmemb, void *datasource)
  42 {
  43         struct ogg_datasource *ods = datasource;
  44         size_t copy = PARA_MIN(ods->numbytes - ods->fpos, 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         /* FIXME: provide better error codes */
 108         if (ret == OV_EREAD)
 109                 return -E_OGG_READ;
 110         if (ret == OV_ENOTVORBIS)
 111                 return -E_OGG_READ;
 112         if (ret == OV_EVERSION)
 113                 return -E_OGG_READ;
 114         if (ret == OV_EBADHEADER)
 115                 return -E_OGG_READ;
 116         if (ret < 0)
 117                 return -E_OGG_READ;
 118         return 1;
 119
 120 }
 121
 122 static void ogg_save_header(char *map, struct audio_format_info *afi)
 123 {
 124         afi->header = para_malloc(afi->header_len);
 125         memcpy(afi->header, map, afi->header_len);
 126 }
 127
 128 static int ogg_compute_header_len(char *map, off_t numbytes,
 129                 struct audio_format_info *afi)
 130 {
 131         int ret, len = PARA_MIN(numbytes, CHUNK_SIZE);
 132         unsigned int serial;
 133         char *buf;
 134         ogg_page page;
 135         ogg_packet packet;
 136         vorbis_comment vc;
 137         vorbis_info vi;
 138         ogg_stream_state *stream_in = para_malloc(sizeof(ogg_stream_state));
 139         ogg_stream_state *stream_out = para_malloc(sizeof(ogg_stream_state));
 140         ogg_sync_state *sync_in = para_malloc(sizeof(ogg_sync_state));
 141
 142         ogg_sync_init(sync_in);
 143         vorbis_info_init(&vi);
 144         vorbis_comment_init(&vc);
 145         buf = ogg_sync_buffer(sync_in, len);
 146         memcpy(buf, map, len);
 147         ogg_sync_wrote(sync_in, len);
 148         ret = -E_SYNC_PAGEOUT;
 149         if (ogg_sync_pageout(sync_in, &page) <= 0)
 150                 goto err1;
 151         serial = ogg_page_serialno(&page);
 152         ogg_stream_init(stream_in, serial);
 153         ogg_stream_init(stream_out, serial);
 154         ret = ogg_stream_pagein(stream_in, &page);
 155         if (ret < 0) {
 156                 ret = E_STREAM_PAGEIN;
 157                 goto err2;
 158         }
 159         ret = ogg_stream_packetout(stream_in, &packet);
 160         if (ret != 1) {
 161                 ret = -E_STREAM_PACKETOUT;
 162                 goto err2;
 163         }
 164         ret = -E_VORBIS;
 165         if (vorbis_synthesis_headerin(&vi, &vc, &packet) < 0)
 166                 goto err2;
 167         PARA_INFO_LOG("channels: %i, rate: %li\n", vi.channels, vi.rate);
 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         ret = ogg_sync_pageout(sync_in, &page);
 180         if (ret <= 0) {
 181                 ret = -E_SYNC_PAGEOUT;
 182                 goto err2;
 183         }
 184         ogg_stream_pagein(stream_in, &page);
 185         ogg_stream_packetout(stream_in, &packet);
 186         ogg_stream_packetin(stream_out, &packet);
 187
 188         afi->header_len = 0;
 189         while (ogg_stream_flush(stream_out, &page))
 190                 afi->header_len += page.body_len + page.header_len;
 191         PARA_INFO_LOG("header_len = %d\n", afi->header_len);
 192         ogg_save_header(map, afi);
 193         ret = 1;
 194 err2:
 195         ogg_stream_destroy(stream_in);
 196         ogg_stream_destroy(stream_out);
 197 err1:
 198         ogg_sync_destroy(sync_in);
 199         vorbis_info_clear(&vi);
 200         vorbis_comment_clear(&vc);
 201         return ret;
 202 }
 203
 204 /*
 205  * Alloc and fill array table of byte offsets. chunk_table[i] is the
 206  * offset in the current input file at which the sample containing time i *
 207  * CHUNK_TIME begins. Always successful.
 208  */
 209 static long unsigned ogg_compute_chunk_table(OggVorbis_File *of,
 210         struct audio_format_info *afi, double time_total)
 211 {
 212         int i, ret, num;
 213         ssize_t max_chunk_len, pos = 0, min = 0, old_pos;
 214         long unsigned num_chunks;
 215
 216         old_pos = 0;
 217         ret = 0;
 218         num = time_total / chunk_time + 3;
 219         PARA_DEBUG_LOG("chunk time: %g allocating %d chunk pointers\n",
 220                 chunk_time, num);
 221         afi->chunk_table = para_malloc(num * sizeof(size_t));
 222         afi->chunk_table[0] = 0;
 223         max_chunk_len = 0;
 224         for (i = 1; ret == 0; i++) {
 225                 ogg_int64_t diff;
 226                 ret = ov_time_seek(of, i * chunk_time);
 227                 if (ret)
 228                         break;
 229                 pos = ov_raw_tell(of);
 230                 diff = pos - old_pos;
 231                 max_chunk_len = PARA_MAX(max_chunk_len, diff);
 232                 min = (i == 1)? diff : PARA_MIN(min, diff);
 233                 afi->chunk_table[i] = pos;
 234 //              if (i < 11 || !((i - 1) % 1000)|| i > num - 11)
 235 //                      PARA_DEBUG_LOG("chunk #%d: %g secs, pos: %zd, "
 236 //                              "size: %zd\n", i - 1,
 237 //                              i * chunk_time, pos, pos - old_pos);
 238                 old_pos = pos;
 239         }
 240         num_chunks = i - 1;
 241         afi->chunk_table[i] = pos;
 242         PARA_INFO_LOG("%lu chunks (%fs), max chunk: %zd, min chunk: %zd\n",
 243                 num_chunks, chunk_time, max_chunk_len, min);
 244         return num_chunks;
 245 }
 246
 247 /*
 248  * Init oggvorbis file and write some tech data to given pointers.
 249  */
 250 static int ogg_get_file_info(FILE *file, char *map, off_t numbytes,
 251                 struct audio_format_info *afi)
 252 {
 253         int ret;
 254         double time_total;
 255         vorbis_info *vi;
 256         ogg_int64_t raw_total;
 257         long vi_sampling_rate, vi_bitrate;
 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, afi);
 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         time_total = ov_time_total(&of, -1);
 278         raw_total = ov_raw_total(&of, -1);
 279         afi->seconds_total = time_total;
 280         vi_sampling_rate = vi->rate;
 281         vi_bitrate = ov_bitrate(&of, 0);
 282         afi->chunks_total = ogg_compute_chunk_table(&of, afi, time_total);
 283         sprintf(afi->info_string, "audio_file_info1:%lu x %lu, %ldkHz, "
 284                 "%d channels, %ldkbps\n"
 285                 "audio_file_info2: \n"
 286                 "audio_file_info3: \n",
 287                 afi->chunks_total, (long unsigned) (chunk_time * 1000 * 1000),
 288                 vi_sampling_rate / 1000, vi->channels, vi_bitrate / 1000
 289                 );
 290         afi->chunk_tv.tv_sec = 0;
 291         afi->chunk_tv.tv_usec = 250 * 1000;
 292         tv_scale(3, &afi->chunk_tv, &afi->eof_tv);
 293         ret = 1;
 294 err:
 295         ov_clear(&of); /* keeps the file open */
 296         if (ret < 0)
 297                 free(afi->header);
 298         return ret;
 299 }
 300
 301 static const char* ogg_suffixes[] = {"ogg", NULL};
 302
 303 /**
 304  * the init function of the ogg vorbis audio format handler
 305  *
 306  * \param afh pointer to the struct to initialize
 307  */
 308 void ogg_init(struct audio_format_handler *afh)
 309 {
 310         afh->get_file_info = ogg_get_file_info,
 311         afh->suffixes = ogg_suffixes;
 312 }