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 /** describes a memory-mapped ogg vorbis file */
  34 struct ogg_datasource {
  35         /** the memory mapping */
  36         char *map;
  37         /** this size of the mapping */
  38         off_t numbytes;
  39         /** the current position in the mapping */
  40         off_t fpos;
  41 };
  42
  43 static size_t cb_read(void *buf, size_t size, size_t nmemb, void *datasource)
  44 {
  45         struct ogg_datasource *ods = datasource;
  46         size_t copy = PARA_MIN(ods->numbytes - ods->fpos, size * nmemb),
  47                 ret = copy / size;
  48         if (!ret)
  49                 return 0;
  50         memcpy(buf, ods->map + ods->fpos, copy);
  51 //      PARA_INFO_LOG("size: %zd, nmemb: %zd, ret: %zd\n", size, nmemb, ret);
  52         ods->fpos += ret * size;
  53         return ret;
  54 }
  55
  56 static int cb_seek(void *datasource, ogg_int64_t offset,
  57                 int whence)
  58 {
  59         struct ogg_datasource *ods = datasource;
  60         switch (whence) {
  61         case SEEK_SET:
  62                 if (offset >= 0 && offset <= ods->numbytes) {
  63                         ods->fpos = offset;
  64                         return 0;
  65                 }
  66                 errno = EINVAL;
  67                 return -1;
  68                 break;
  69         case SEEK_END:
  70                 if (offset <= 0 && -offset <= ods->numbytes) {
  71                         ods->fpos = ods->numbytes + offset;
  72                         return 0;
  73                 }
  74                 errno = EINVAL;
  75                 return -1;
  76                 break;
  77         case SEEK_CUR:
  78                 if ((offset >= 0 && offset + ods->fpos > ods->numbytes) ||
  79                                 (offset < 0 && offset + ods->fpos < 0)) {
  80                         errno = EINVAL;
  81                         return -1;
  82                 }
  83                 ods->fpos += offset;
  84                 return 0;
  85         }
  86         errno = EINVAL;
  87         return -1;
  88 }
  89
  90 /* don't do anything as vss still needs the open filehandle */
  91 static int cb_close(__a_unused void *datasource)
  92 {
  93         return 0;
  94 }
  95
  96 static long cb_tell(void *datasource)
  97 {
  98         struct ogg_datasource *ods = datasource;
  99         return (unsigned long)ods->fpos;
 100 }
 101
 102 static int ogg_open_callbacks(void *datasource, OggVorbis_File *vf, ov_callbacks c)
 103 {
 104         int ret = ov_open_callbacks(datasource, vf,
 105                 NULL, /* no initial buffer */
 106                 0, /* no initial bytes */
 107                 c); /* the ov_open_callbacks */
 108
 109         if (ret == OV_EREAD)
 110                 return -E_OGG_READ;
 111         if (ret == OV_ENOTVORBIS)
 112                 return -E_VORBIS;
 113         if (ret == OV_EVERSION)
 114                 return -E_OGG_VERSION;
 115         if (ret == OV_EBADHEADER)
 116                 return -E_OGG_BAD_HEADER;
 117         if (ret < 0)
 118                 return -E_OGG_UNKNOWN_ERROR;
 119         return 1;
 120
 121 }
 122
 123 static int ogg_compute_header_len(char *map, size_t numbytes,
 124                 struct audio_format_info *afi)
 125 {
 126         int ret;
 127         size_t len = PARA_MIN(numbytes, CHUNK_SIZE);
 128         int serial;
 129         char *buf;
 130
 131         ogg_page page;
 132         ogg_packet packet;
 133         vorbis_comment vc;
 134         vorbis_info vi;
 135         ogg_stream_state *stream_in = para_malloc(sizeof(ogg_stream_state));
 136         ogg_stream_state *stream_out = para_malloc(sizeof(ogg_stream_state));
 137         ogg_sync_state *sync_in = para_malloc(sizeof(ogg_sync_state));
 138
 139         ogg_sync_init(sync_in);
 140         vorbis_info_init(&vi);
 141         vorbis_comment_init(&vc);
 142         buf = ogg_sync_buffer(sync_in, (long)len);
 143         memcpy(buf, map, len);
 144         ogg_sync_wrote(sync_in, (long)len);
 145         ret = -E_SYNC_PAGEOUT;
 146         if (ogg_sync_pageout(sync_in, &page) <= 0)
 147                 goto err1;
 148         serial = ogg_page_serialno(&page);
 149         ogg_stream_init(stream_in, serial);
 150         ogg_stream_init(stream_out, serial);
 151         ret = ogg_stream_pagein(stream_in, &page);
 152         if (ret < 0) {
 153                 ret = -E_STREAM_PAGEIN;
 154                 goto err2;
 155         }
 156         ret = ogg_stream_packetout(stream_in, &packet);
 157         if (ret != 1) {
 158                 ret = -E_STREAM_PACKETOUT;
 159                 goto err2;
 160         }
 161         ret = -E_VORBIS;
 162         if (vorbis_synthesis_headerin(&vi, &vc, &packet) < 0)
 163                 goto err2;
 164         PARA_INFO_LOG("channels: %i, rate: %li\n", vi.channels, vi.rate);
 165         ogg_stream_packetin(stream_out, &packet);
 166
 167         ret = ogg_sync_pageout(sync_in, &page);
 168         if (ret <= 0) {
 169                 ret = -E_SYNC_PAGEOUT;
 170                 goto err2;
 171         }
 172         ogg_stream_pagein(stream_in, &page);
 173         ogg_stream_packetout(stream_in, &packet);
 174         ogg_stream_packetin(stream_out, &packet);
 175
 176         ret = ogg_sync_pageout(sync_in, &page);
 177         if (ret <= 0) {
 178                 ret = -E_SYNC_PAGEOUT;
 179                 goto err2;
 180         }
 181         ogg_stream_pagein(stream_in, &page);
 182         ogg_stream_packetout(stream_in, &packet);
 183         ogg_stream_packetin(stream_out, &packet);
 184
 185         afi->header_len = 0;
 186         while (ogg_stream_flush(stream_out, &page))
 187                 afi->header_len += page.body_len + page.header_len;
 188         PARA_INFO_LOG("header_len = %d\n", afi->header_len);
 189         afi->header_offset = 0;
 190         ret = 1;
 191 err2:
 192         ogg_stream_destroy(stream_in);
 193         ogg_stream_destroy(stream_out);
 194 err1:
 195         ogg_sync_destroy(sync_in);
 196         vorbis_info_clear(&vi);
 197         vorbis_comment_clear(&vc);
 198         return ret;
 199 }
 200
 201 /*
 202  * Alloc and fill array table of byte offsets. chunk_table[i] is the
 203  * offset in the current input file at which the sample containing time i *
 204  * CHUNK_TIME begins. Always successful.
 205  */
 206 static long unsigned ogg_compute_chunk_table(OggVorbis_File *of,
 207         struct audio_format_info *afi, long unsigned time_total)
 208 {
 209         int i, ret, num;
 210         ssize_t max_chunk_len, pos = 0, min = 0, old_pos;
 211         long unsigned num_chunks;
 212
 213         old_pos = 0;
 214         ret = 0;
 215         num = time_total / chunk_time + 3;
 216         PARA_DEBUG_LOG("chunk time: %g allocating %d chunk pointers\n",
 217                 chunk_time, num);
 218         afi->chunk_table = para_malloc((num + 1) * sizeof(size_t));
 219         afi->chunk_table[0] = 0;
 220         max_chunk_len = 0;
 221         for (i = 1; ret <= num; i++) {
 222                 ogg_int64_t diff;
 223                 ret = ov_time_seek(of, i * chunk_time);
 224                 if (ret)
 225                         break;
 226                 pos = ov_raw_tell(of);
 227                 diff = pos - old_pos;
 228                 max_chunk_len = PARA_MAX(max_chunk_len, diff);
 229                 min = (i == 1)? diff : PARA_MIN(min, diff);
 230                 afi->chunk_table[i] = pos;
 231 //              if (i < 11 || !((i - 1) % 1000)|| i > num - 11)
 232 //                      PARA_DEBUG_LOG("chunk #%d: %g secs, pos: %zd, "
 233 //                              "size: %zd\n", i - 1,
 234 //                              i * chunk_time, pos, pos - old_pos);
 235                 old_pos = pos;
 236         }
 237         num_chunks = i - 1;
 238 //fi->chunk_table[i] = pos;
 239         PARA_INFO_LOG("%lu chunks (%fs), max chunk: %zd, min chunk: %zd\n",
 240                 num_chunks, chunk_time, max_chunk_len, min);
 241         return num_chunks;
 242 }
 243
 244 /*
 245  * Init oggvorbis file and write some tech data to given pointers.
 246  */
 247 static int ogg_get_file_info(char *map, size_t numbytes,
 248                 struct audio_format_info *afi)
 249 {
 250         int ret;
 251         vorbis_info *vi;
 252         OggVorbis_File of;
 253         const ov_callbacks ovc = {
 254                 .read_func = cb_read,
 255                 .seek_func = cb_seek,
 256                 .close_func = cb_close,
 257                 .tell_func = cb_tell
 258         };
 259         struct ogg_datasource ods = {.map = map, .numbytes = numbytes, .fpos = 0};
 260
 261         ret = ogg_compute_header_len(map, numbytes, afi);
 262         if (ret < 0)
 263                 return ret;
 264         ret = ogg_open_callbacks(&ods, &of, ovc);
 265         if (ret < 0)
 266                 goto err;
 267         ret = -E_OGG_INFO;
 268         vi = ov_info(&of, 0);
 269         if (!vi)
 270                 goto err;
 271         afi->seconds_total = ov_time_total(&of, -1);
 272         afi->frequency = vi->rate;
 273         afi->bitrate = ov_bitrate(&of, 0);
 274         afi->channels = vi->channels;
 275         afi->chunks_total = ogg_compute_chunk_table(&of, afi, afi->seconds_total);
 276         sprintf(afi->info_string, "audio_file_info1:%lu x %lu, %ukHz, "
 277                 "%d channels, %ukbps\n"
 278                 "audio_file_info2: \n"
 279                 "audio_file_info3: \n",
 280                 afi->chunks_total, (long unsigned) (chunk_time * 1000 * 1000),
 281                 afi->frequency / 1000, vi->channels, afi->bitrate / 1000
 282                 );
 283         afi->chunk_tv.tv_sec = 0;
 284         afi->chunk_tv.tv_usec = 250 * 1000;
 285         tv_scale(3, &afi->chunk_tv, &afi->eof_tv);
 286         ret = 1;
 287 err:
 288         ov_clear(&of); /* keeps the file open */
 289         return ret;
 290 }
 291
 292 static const char* ogg_suffixes[] = {"ogg", NULL};
 293
 294 /**
 295  * the init function of the ogg vorbis audio format handler
 296  *
 297  * \param afh pointer to the struct to initialize
 298  */
 299 void ogg_init(struct audio_format_handler *afh)
 300 {
 301         afh->get_file_info = ogg_get_file_info,
 302         afh->suffixes = ogg_suffixes;
 303 }