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.h"
  26 #include "error.h"
  27 #include "string.h"
  28
  29 /** must be big enough to hold header */
  30 #define CHUNK_SIZE 32768
  31 static double chunk_time = 0.25;
  32
  33 struct ogg_datasource {
  34         char *map;
  35         off_t numbytes;
  36         off_t fpos;
  37 };
  38
  39 static size_t cb_read(void *buf, size_t size, size_t nmemb, void *datasource)
  40 {
  41         struct ogg_datasource *ods = datasource;
  42         size_t copy = PARA_MIN(ods->numbytes - ods->fpos, size * nmemb),
  43                 ret = copy / size;
  44         if (!ret)
  45                 return 0;
  46         memcpy(buf, ods->map + ods->fpos, copy);
  47 //      PARA_INFO_LOG("size: %zd, nmemb: %zd, ret: %zd\n", size, nmemb, ret);
  48         ods->fpos += ret * size;
  49         return ret;
  50 }
  51
  52 static int cb_seek(void *datasource, ogg_int64_t offset,
  53                 int whence)
  54 {
  55         struct ogg_datasource *ods = datasource;
  56         switch (whence) {
  57         case SEEK_SET:
  58                 if (offset >= 0 && offset <= ods->numbytes) {
  59                         ods->fpos = offset;
  60                         return 0;
  61                 }
  62                 errno = EINVAL;
  63                 return -1;
  64                 break;
  65         case SEEK_END:
  66                 if (offset <= 0 && -offset <= ods->numbytes) {
  67                         ods->fpos = ods->numbytes + offset;
  68                         return 0;
  69                 }
  70                 errno = EINVAL;
  71                 return -1;
  72                 break;
  73         case SEEK_CUR:
  74                 if ((offset >= 0 && offset + ods->fpos > ods->numbytes) ||
  75                                 (offset < 0 && offset + ods->fpos < 0)) {
  76                         errno = EINVAL;
  77                         return -1;
  78                 }
  79                 ods->fpos += offset;
  80                 return 0;
  81         }
  82         errno = EINVAL;
  83         return -1;
  84 }
  85
  86 /* don't do anything as vss still needs the open filehandle */
  87 static int cb_close(__a_unused void *datasource)
  88 {
  89         return 0;
  90 }
  91
  92 static long cb_tell(void *datasource)
  93 {
  94         struct ogg_datasource *ods = datasource;
  95         return (unsigned long)ods->fpos;
  96 }
  97
  98 static int ogg_open_callbacks(void *datasource, OggVorbis_File *vf, ov_callbacks c)
  99 {
 100         int ret = ov_open_callbacks(datasource, vf,
 101                 NULL, /* no initial buffer */
 102                 0, /* no initial bytes */
 103                 c); /* the ov_open_callbacks */
 104
 105         /* FIXME: provide better error codes */
 106         if (ret == OV_EREAD)
 107                 return -E_OGG_READ;
 108         if (ret == OV_ENOTVORBIS)
 109                 return -E_OGG_READ;
 110         if (ret == OV_EVERSION)
 111                 return -E_OGG_READ;
 112         if (ret == OV_EBADHEADER)
 113                 return -E_OGG_READ;
 114         if (ret < 0)
 115                 return -E_OGG_READ;
 116         return 1;
 117
 118 }
 119
 120 static int ogg_compute_header_len(char *map, size_t numbytes,
 121                 struct audio_format_info *afi)
 122 {
 123         int ret;
 124         size_t len = PARA_MIN(numbytes, 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                 goto err1;
 145         serial = ogg_page_serialno(&page);
 146         ogg_stream_init(stream_in, serial);
 147         ogg_stream_init(stream_out, serial);
 148         ret = ogg_stream_pagein(stream_in, &page);
 149         if (ret < 0) {
 150                 ret = E_STREAM_PAGEIN;
 151                 goto err2;
 152         }
 153         ret = ogg_stream_packetout(stream_in, &packet);
 154         if (ret != 1) {
 155                 ret = -E_STREAM_PACKETOUT;
 156                 goto err2;
 157         }
 158         ret = -E_VORBIS;
 159         if (vorbis_synthesis_headerin(&vi, &vc, &packet) < 0)
 160                 goto err2;
 161         PARA_INFO_LOG("channels: %i, rate: %li\n", vi.channels, vi.rate);
 162         ogg_stream_packetin(stream_out, &packet);
 163
 164         ret = ogg_sync_pageout(sync_in, &page);
 165         if (ret <= 0) {
 166                 ret = -E_SYNC_PAGEOUT;
 167                 goto err2;
 168         }
 169         ogg_stream_pagein(stream_in, &page);
 170         ogg_stream_packetout(stream_in, &packet);
 171         ogg_stream_packetin(stream_out, &packet);
 172
 173         ret = ogg_sync_pageout(sync_in, &page);
 174         if (ret <= 0) {
 175                 ret = -E_SYNC_PAGEOUT;
 176                 goto err2;
 177         }
 178         ogg_stream_pagein(stream_in, &page);
 179         ogg_stream_packetout(stream_in, &packet);
 180         ogg_stream_packetin(stream_out, &packet);
 181
 182         afi->header_len = 0;
 183         while (ogg_stream_flush(stream_out, &page))
 184                 afi->header_len += page.body_len + page.header_len;
 185         PARA_INFO_LOG("header_len = %d\n", afi->header_len);
 186         afi->header_offset = 0;
 187         ret = 1;
 188 err2:
 189         ogg_stream_destroy(stream_in);
 190         ogg_stream_destroy(stream_out);
 191 err1:
 192         ogg_sync_destroy(sync_in);
 193         vorbis_info_clear(&vi);
 194         vorbis_comment_clear(&vc);
 195         return ret;
 196 }
 197
 198 /*
 199  * Alloc and fill array table of byte offsets. chunk_table[i] is the
 200  * offset in the current input file at which the sample containing time i *
 201  * CHUNK_TIME begins. Always successful.
 202  */
 203 static long unsigned ogg_compute_chunk_table(OggVorbis_File *of,
 204         struct audio_format_info *afi, long unsigned time_total)
 205 {
 206         int i, ret, num;
 207         ssize_t max_chunk_len, pos = 0, min = 0, old_pos;
 208         long unsigned num_chunks;
 209
 210         old_pos = 0;
 211         ret = 0;
 212         num = time_total / chunk_time + 3;
 213         PARA_DEBUG_LOG("chunk time: %g allocating %d chunk pointers\n",
 214                 chunk_time, num);
 215         afi->chunk_table = para_malloc((num + 1) * sizeof(size_t));
 216         afi->chunk_table[0] = 0;
 217         max_chunk_len = 0;
 218         for (i = 1; ret <= num; i++) {
 219                 ogg_int64_t diff;
 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_chunk_len = PARA_MAX(max_chunk_len, diff);
 226                 min = (i == 1)? diff : PARA_MIN(min, diff);
 227                 afi->chunk_table[i] = pos;
 228 //              if (i < 11 || !((i - 1) % 1000)|| i > num - 11)
 229 //                      PARA_DEBUG_LOG("chunk #%d: %g secs, pos: %zd, "
 230 //                              "size: %zd\n", i - 1,
 231 //                              i * chunk_time, pos, pos - old_pos);
 232                 old_pos = pos;
 233         }
 234         num_chunks = i - 1;
 235 //fi->chunk_table[i] = pos;
 236         PARA_INFO_LOG("%lu chunks (%fs), max chunk: %zd, min chunk: %zd\n",
 237                 num_chunks, chunk_time, max_chunk_len, min);
 238         return num_chunks;
 239 }
 240
 241 /*
 242  * Init oggvorbis file and write some tech data to given pointers.
 243  */
 244 static int ogg_get_file_info(char *map, size_t numbytes,
 245                 struct audio_format_info *afi)
 246 {
 247         int ret;
 248         vorbis_info *vi;
 249         OggVorbis_File of;
 250         const ov_callbacks ovc = {
 251                 .read_func = cb_read,
 252                 .seek_func = cb_seek,
 253                 .close_func = cb_close,
 254                 .tell_func = cb_tell
 255         };
 256         struct ogg_datasource ods = {.map = map, .numbytes = numbytes, .fpos = 0};
 257
 258         ret = ogg_compute_header_len(map, numbytes, afi);
 259         if (ret < 0)
 260                 return ret;
 261         ret = ogg_open_callbacks(&ods, &of, ovc);
 262         if (ret < 0)
 263                 goto err;
 264         ret = -E_OGG_INFO;
 265         vi = ov_info(&of, 0);
 266         if (!vi)
 267                 goto err;
 268         afi->seconds_total = ov_time_total(&of, -1);
 269         afi->frequency = vi->rate;
 270         afi->bitrate = ov_bitrate(&of, 0);
 271         afi->channels = vi->channels;
 272         afi->chunks_total = ogg_compute_chunk_table(&of, afi, afi->seconds_total);
 273         sprintf(afi->info_string, "audio_file_info1:%lu x %lu, %ukHz, "
 274                 "%d channels, %ukbps\n"
 275                 "audio_file_info2: \n"
 276                 "audio_file_info3: \n",
 277                 afi->chunks_total, (long unsigned) (chunk_time * 1000 * 1000),
 278                 afi->frequency / 1000, vi->channels, afi->bitrate / 1000
 279                 );
 280         afi->chunk_tv.tv_sec = 0;
 281         afi->chunk_tv.tv_usec = 250 * 1000;
 282         tv_scale(3, &afi->chunk_tv, &afi->eof_tv);
 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 }