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, off_t numbytes,
 121                 struct audio_format_info *afi)
 122 {
 123         int ret, len = PARA_MIN(numbytes, CHUNK_SIZE);
 124         unsigned int serial;
 125         char *buf;
 126         ogg_page page;
 127         ogg_packet packet;
 128         vorbis_comment vc;
 129         vorbis_info vi;
 130         ogg_stream_state *stream_in = para_malloc(sizeof(ogg_stream_state));
 131         ogg_stream_state *stream_out = para_malloc(sizeof(ogg_stream_state));
 132         ogg_sync_state *sync_in = para_malloc(sizeof(ogg_sync_state));
 133
 134         ogg_sync_init(sync_in);
 135         vorbis_info_init(&vi);
 136         vorbis_comment_init(&vc);
 137         buf = ogg_sync_buffer(sync_in, len);
 138         memcpy(buf, map, len);
 139         ogg_sync_wrote(sync_in, len);
 140         ret = -E_SYNC_PAGEOUT;
 141         if (ogg_sync_pageout(sync_in, &page) <= 0)
 142                 goto err1;
 143         serial = ogg_page_serialno(&page);
 144         ogg_stream_init(stream_in, serial);
 145         ogg_stream_init(stream_out, serial);
 146         ret = ogg_stream_pagein(stream_in, &page);
 147         if (ret < 0) {
 148                 ret = E_STREAM_PAGEIN;
 149                 goto err2;
 150         }
 151         ret = ogg_stream_packetout(stream_in, &packet);
 152         if (ret != 1) {
 153                 ret = -E_STREAM_PACKETOUT;
 154                 goto err2;
 155         }
 156         ret = -E_VORBIS;
 157         if (vorbis_synthesis_headerin(&vi, &vc, &packet) < 0)
 158                 goto err2;
 159         PARA_INFO_LOG("channels: %i, rate: %li\n", vi.channels, vi.rate);
 160         ogg_stream_packetin(stream_out, &packet);
 161
 162         ret = ogg_sync_pageout(sync_in, &page);
 163         if (ret <= 0) {
 164                 ret = -E_SYNC_PAGEOUT;
 165                 goto err2;
 166         }
 167         ogg_stream_pagein(stream_in, &page);
 168         ogg_stream_packetout(stream_in, &packet);
 169         ogg_stream_packetin(stream_out, &packet);
 170
 171         ret = ogg_sync_pageout(sync_in, &page);
 172         if (ret <= 0) {
 173                 ret = -E_SYNC_PAGEOUT;
 174                 goto err2;
 175         }
 176         ogg_stream_pagein(stream_in, &page);
 177         ogg_stream_packetout(stream_in, &packet);
 178         ogg_stream_packetin(stream_out, &packet);
 179
 180         afi->header_len = 0;
 181         while (ogg_stream_flush(stream_out, &page))
 182                 afi->header_len += page.body_len + page.header_len;
 183         PARA_INFO_LOG("header_len = %d\n", afi->header_len);
 184         afi->header_offset = 0;
 185         ret = 1;
 186 err2:
 187         ogg_stream_destroy(stream_in);
 188         ogg_stream_destroy(stream_out);
 189 err1:
 190         ogg_sync_destroy(sync_in);
 191         vorbis_info_clear(&vi);
 192         vorbis_comment_clear(&vc);
 193         return ret;
 194 }
 195
 196 /*
 197  * Alloc and fill array table of byte offsets. chunk_table[i] is the
 198  * offset in the current input file at which the sample containing time i *
 199  * CHUNK_TIME begins. Always successful.
 200  */
 201 static long unsigned ogg_compute_chunk_table(OggVorbis_File *of,
 202         struct audio_format_info *afi, double time_total)
 203 {
 204         int i, ret, num;
 205         ssize_t max_chunk_len, pos = 0, min = 0, old_pos;
 206         long unsigned num_chunks;
 207
 208         old_pos = 0;
 209         ret = 0;
 210         num = time_total / chunk_time + 3;
 211         PARA_DEBUG_LOG("chunk time: %g allocating %d chunk pointers\n",
 212                 chunk_time, num);
 213         afi->chunk_table = para_malloc((num + 1) * sizeof(size_t));
 214         afi->chunk_table[0] = 0;
 215         max_chunk_len = 0;
 216         for (i = 1; ret <= num; i++) {
 217                 ogg_int64_t diff;
 218                 ret = ov_time_seek(of, i * chunk_time);
 219                 if (ret)
 220                         break;
 221                 pos = ov_raw_tell(of);
 222                 diff = pos - old_pos;
 223                 max_chunk_len = PARA_MAX(max_chunk_len, diff);
 224                 min = (i == 1)? diff : PARA_MIN(min, diff);
 225                 afi->chunk_table[i] = pos;
 226 //              if (i < 11 || !((i - 1) % 1000)|| i > num - 11)
 227 //                      PARA_DEBUG_LOG("chunk #%d: %g secs, pos: %zd, "
 228 //                              "size: %zd\n", i - 1,
 229 //                              i * chunk_time, pos, pos - old_pos);
 230                 old_pos = pos;
 231         }
 232         num_chunks = i - 1;
 233 //fi->chunk_table[i] = pos;
 234         PARA_INFO_LOG("%lu chunks (%fs), max chunk: %zd, min chunk: %zd\n",
 235                 num_chunks, chunk_time, max_chunk_len, min);
 236         return num_chunks;
 237 }
 238
 239 /*
 240  * Init oggvorbis file and write some tech data to given pointers.
 241  */
 242 static int ogg_get_file_info(char *map, off_t numbytes,
 243                 struct audio_format_info *afi)
 244 {
 245         int ret;
 246         vorbis_info *vi;
 247         OggVorbis_File of;
 248         const ov_callbacks ovc = {
 249                 .read_func = cb_read,
 250                 .seek_func = cb_seek,
 251                 .close_func = cb_close,
 252                 .tell_func = cb_tell
 253         };
 254         struct ogg_datasource ods = {.map = map, .numbytes = numbytes, .fpos = 0};
 255
 256         ret = ogg_compute_header_len(map, numbytes, afi);
 257         if (ret < 0)
 258                 return ret;
 259         ret = ogg_open_callbacks(&ods, &of, ovc);
 260         if (ret < 0)
 261                 goto err;
 262         ret = -E_OGG_INFO;
 263         vi = ov_info(&of, 0);
 264         if (!vi)
 265                 goto err;
 266         afi->seconds_total = ov_time_total(&of, -1);
 267         afi->frequency = vi->rate;
 268         afi->bitrate = ov_bitrate(&of, 0);
 269         afi->channels = vi->channels;
 270         afi->chunks_total = ogg_compute_chunk_table(&of, afi, afi->seconds_total);
 271         sprintf(afi->info_string, "audio_file_info1:%lu x %lu, %ukHz, "
 272                 "%d channels, %ukbps\n"
 273                 "audio_file_info2: \n"
 274                 "audio_file_info3: \n",
 275                 afi->chunks_total, (long unsigned) (chunk_time * 1000 * 1000),
 276                 afi->frequency / 1000, vi->channels, afi->bitrate / 1000
 277                 );
 278         afi->chunk_tv.tv_sec = 0;
 279         afi->chunk_tv.tv_usec = 250 * 1000;
 280         tv_scale(3, &afi->chunk_tv, &afi->eof_tv);
 281         ret = 1;
 282 err:
 283         ov_clear(&of); /* keeps the file open */
 284         return ret;
 285 }
 286
 287 static const char* ogg_suffixes[] = {"ogg", NULL};
 288
 289 /**
 290  * the init function of the ogg vorbis audio format handler
 291  *
 292  * \param afh pointer to the struct to initialize
 293  */
 294 void ogg_init(struct audio_format_handler *afh)
 295 {
 296         afh->get_file_info = ogg_get_file_info,
 297         afh->suffixes = ogg_suffixes;
 298 }