ogg_afh.c

   1 /*
   2  * Copyright (C) 2004-2006 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 <ogg/ogg.h>
  21 #include <vorbis/codec.h>
  22 #include <vorbis/vorbisfile.h>
  23
  24 #include "server.cmdline.h"
  25 #include "server.h"
  26 #include "afs.h"
  27 #include "afh.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 static OggVorbis_File *oggvorbis_file;
  36 static FILE *infile;
  37 static int header_len, oggbuf_len, vi_channels;
  38 static char *header, *oggbuf;
  39 static ssize_t *chunk_table, max_chunk_len;
  40 struct audio_format_handler *af;
  41 static long vi_sampling_rate, vi_bitrate, vi_bitrate_nominal,
  42         num_chunks;
  43
  44 static int ogg_compute_header_len(void)
  45 {
  46         int ret, len, in = fileno(infile);
  47         unsigned int serial;
  48         char *buf;
  49         ogg_page page;
  50         ogg_packet packet;
  51         vorbis_comment vc;
  52         vorbis_info vi;
  53         ogg_stream_state *stream_in = para_malloc(sizeof(ogg_stream_state));
  54         ogg_stream_state *stream_out = para_malloc(sizeof(ogg_stream_state));
  55         ogg_sync_state *sync_in = para_malloc(sizeof(ogg_sync_state));
  56
  57         ogg_sync_init(sync_in);
  58         vorbis_info_init(&vi);
  59         vorbis_comment_init(&vc);
  60         buf = ogg_sync_buffer(sync_in, CHUNK_SIZE);
  61         len = read(in, buf, CHUNK_SIZE);
  62         ret = -E_OGG_READ;
  63         if (len <= 0)
  64                 goto err1;
  65         ogg_sync_wrote(sync_in, len);
  66         ret = -E_SYNC_PAGEOUT;
  67         if (ogg_sync_pageout(sync_in, &page) <= 0)
  68                 goto err1;
  69         serial = ogg_page_serialno(&page);
  70         ogg_stream_init(stream_in, serial);
  71         ogg_stream_init(stream_out, serial);
  72         ret = ogg_stream_pagein(stream_in, &page);
  73         if (ret < 0) {
  74                 ret = E_STREAM_PAGEIN;
  75                 goto err2;
  76         }
  77         ret = ogg_stream_packetout(stream_in, &packet);
  78         if (ret != 1) {
  79                 ret = -E_STREAM_PACKETOUT;
  80                 goto err2;
  81         }
  82         ret = -E_VORBIS;
  83         if (vorbis_synthesis_headerin(&vi, &vc, &packet) < 0) {
  84                 goto err2;
  85         } else
  86                 PARA_INFO_LOG("channels: %i, rate: %li\n", vi.channels,
  87                         vi.rate);
  88         ogg_stream_packetin(stream_out, &packet);
  89
  90         ret = ogg_sync_pageout(sync_in, &page);
  91         if (ret <= 0) {
  92                 ret = -E_SYNC_PAGEOUT;
  93                 goto err2;
  94         }
  95         ogg_stream_pagein(stream_in, &page);
  96         ogg_stream_packetout(stream_in, &packet);
  97         ogg_stream_packetin(stream_out, &packet);
  98
  99         ret = ogg_sync_pageout(sync_in, &page);
 100         if (ret <= 0) {
 101                 ret = -E_SYNC_PAGEOUT;
 102                 goto err2;
 103         }
 104         ogg_stream_pagein(stream_in, &page);
 105         ogg_stream_packetout(stream_in, &packet);
 106         ogg_stream_packetin(stream_out, &packet);
 107
 108         header_len = 0;
 109         while (ogg_stream_flush(stream_out, &page))
 110                 header_len += page.body_len + page.header_len;
 111         ret = len;
 112         PARA_INFO_LOG("header_len = %d\n", header_len);
 113 err2:
 114         ogg_stream_destroy(stream_in);
 115         ogg_stream_destroy(stream_out);
 116 err1:
 117         ogg_sync_destroy(sync_in);
 118         vorbis_info_clear(&vi);
 119         vorbis_comment_clear(&vc);
 120         return ret;
 121 }
 122
 123 static void tunetable(void)
 124 {
 125         int i = 1, j = -1, lp = 1;
 126         while (i < num_chunks) {
 127                 if (chunk_table[i] == chunk_table[lp]) {
 128                         i++;
 129                         continue;
 130                 }
 131                 if (j < 0)
 132                         tv_scale(i + 2, &af->chunk_tv, &af->eof_tv);
 133                 for (j = lp; j < i; j++)
 134                         chunk_table[j] = chunk_table[i];
 135                 lp = i;
 136         }
 137 #if 1
 138         for (i = 2; i < num_chunks; i++)
 139                 if (chunk_table[i] != chunk_table[1])
 140                         break;
 141         lp = i;
 142         for (i = 2; i < num_chunks - lp; i++)
 143                 chunk_table[i] = chunk_table[i + lp];
 144 #endif
 145 }
 146
 147
 148 /*
 149  * Alloc and fill array table of byte offsets. chunk_table[i] is the
 150  * offset in the current infile at which the sample containing time i *
 151  * CHUNK_TIME begins.
 152  */
 153 static void ogg_compute_chunk_table(double time_total)
 154 {
 155         int i, ret, num;
 156         ssize_t pos = 0, min = 0, old_pos;
 157
 158         old_pos = 0;
 159         ret = 0;
 160         num = time_total / chunk_time + 3;
 161         PARA_DEBUG_LOG("chunk time: %g allocating %d chunk pointers\n",
 162                 chunk_time, num);
 163         chunk_table = para_malloc(num * sizeof(ogg_int64_t));
 164         chunk_table[0] = 0;
 165         max_chunk_len = 0;
 166         rewind(infile);
 167         for (i = 1; ret == 0; i++) {
 168                 ogg_int64_t diff;
 169                 ret = ov_time_seek(oggvorbis_file, i * chunk_time);
 170                 if (ret)
 171                         break;
 172                 pos = ov_raw_tell(oggvorbis_file);
 173                 diff = pos - old_pos;
 174                 max_chunk_len = PARA_MAX(max_chunk_len, diff);
 175                 min = (i == 1)? diff : PARA_MIN(min, diff);
 176                 chunk_table[i] = pos;
 177                 if (i < 11 || !((i - 1) % 1000)|| i > num - 11)
 178                         PARA_DEBUG_LOG("chunk #%d: %g secs, pos: %zd, "
 179                                 "size: %zd\n", i - 1,
 180                                 i * chunk_time, pos, pos - old_pos);
 181                 old_pos = pos;
 182         }
 183         num_chunks = i - 1;
 184         chunk_table[i] = pos;
 185         tunetable();
 186         PARA_INFO_LOG("%li chunks (%fs), max chunk: %zd, min chunk: %zd\n",
 187                 num_chunks, chunk_time, max_chunk_len, min);
 188         rewind(infile);
 189 }
 190
 191 static void ogg_close_audio_file(void)
 192 {
 193         if (oggvorbis_file) {
 194                 PARA_DEBUG_LOG("%s", "ov_clear\n");
 195                 ov_clear(oggvorbis_file);
 196                 free(oggvorbis_file);
 197                 oggvorbis_file = NULL;
 198         }
 199         free(header);
 200         header = NULL;
 201         header_len = 0;
 202         free(chunk_table);
 203         chunk_table = NULL;
 204         num_chunks = 0;
 205         free(oggbuf);
 206         oggbuf = NULL;
 207         oggbuf_len = 0;
 208 }
 209
 210 static int ogg_save_header(FILE *file, int header_len)
 211 {
 212         int ret;
 213
 214         header = para_malloc(header_len);
 215         rewind(file);
 216         ret = read(fileno(file), header, header_len);
 217         if (ret != header_len)
 218                 return -E_OGG_READ;
 219         return 1;
 220 }
 221
 222 /*
 223  * Init oggvorbis file and write some tech data to given pointers.
 224  */
 225 static int ogg_get_file_info(FILE *file, char *info_str, long unsigned *frames,
 226         int *seconds)
 227 {
 228         int ret;
 229         double time_total;
 230         vorbis_info *vi;
 231         ogg_int64_t raw_total;
 232
 233         infile = file;
 234         if (!file)
 235                 return -E_OGG_NO_FILE;
 236         ret = ogg_compute_header_len();
 237         if (ret < 0)
 238                 return ret;
 239         ret = ogg_save_header(file, header_len);
 240         if (ret < 0)
 241                 return ret;
 242         rewind(file);
 243         oggvorbis_file = para_malloc(sizeof(OggVorbis_File));
 244         ret = ov_open(file, oggvorbis_file, NULL, 0);
 245         if (ret < 0) {
 246                 free(oggvorbis_file);
 247                 free(header);
 248                 return -E_OGG_OPEN;
 249         }
 250         ret = -E_OGG_INFO;
 251         vi = ov_info(oggvorbis_file, 0);
 252         if (!vi)
 253                 goto err;
 254         time_total = ov_time_total(oggvorbis_file, -1);
 255         raw_total = ov_raw_total(oggvorbis_file, -1);
 256         *seconds = time_total;
 257         vi_sampling_rate = vi->rate;
 258         vi_bitrate = ov_bitrate(oggvorbis_file, 0);
 259         vi_bitrate_nominal = vi->bitrate_nominal;
 260         vi_channels = vi->channels;
 261         ogg_compute_chunk_table(time_total);
 262         *frames = num_chunks;
 263         sprintf(info_str, "audio_file_info1:%lu x %lu, %ldkHz, %d channels, %ldkbps\n"
 264                 "audio_file_info2: \n"
 265                 "audio_file_info3: \n",
 266                 num_chunks, (long unsigned) (chunk_time * 1000 * 1000),
 267                 vi_sampling_rate / 1000, vi_channels, vi_bitrate / 1000
 268                 );
 269         rewind(file);
 270         return 1;
 271 err:
 272         ogg_close_audio_file();
 273         return ret;
 274 }
 275
 276 /*
 277  * Simple stream reposition routine
 278  */
 279 static int ogg_reposition_stream(long unsigned request)
 280 {
 281         int ret;
 282         long seek;
 283
 284         seek = chunk_table[request];
 285         ret = fseek(infile, seek, SEEK_SET);
 286         PARA_DEBUG_LOG("seek to %li returned %d. offset:%li\n", seek,
 287                 ret, ftell(infile));
 288         return ret < 0? -E_OGG_REPOS : 1;
 289 }
 290
 291 static ogg_int64_t get_chunk_size(long unsigned chunk_num)
 292 {
 293         ogg_int64_t ret;
 294         if (chunk_num >= num_chunks)
 295                 return -1;
 296         ret = chunk_table[chunk_num + 1] - chunk_table[chunk_num];
 297         if (!ret)
 298                 return ret;
 299 #if 0
 300         PARA_DEBUG_LOG("chunk %d: %lli-%lli (%lli bytes)\n",
 301                 chunk_num,
 302                 chunk_table[chunk_num],
 303                 chunk_table[chunk_num + 1] - 1,
 304                 ret);
 305 #endif
 306         return ret;
 307 }
 308
 309 char *ogg_read_chunk(long unsigned current_chunk, ssize_t *len)
 310 {
 311         int ret;
 312         ogg_int64_t cs = get_chunk_size(current_chunk);
 313         if (!cs) { /* nothing to send for this run */
 314                 *len = 0;
 315                 return oggbuf;
 316         }
 317         if (cs < 0) { /* eof */
 318                 *len = 0;
 319                 return NULL;
 320         }
 321         *len = cs;
 322         if (!oggbuf || oggbuf_len < *len) {
 323                 PARA_INFO_LOG("increasing ogg buffer size (%d -> %zu)\n",
 324                         oggbuf_len, *len);
 325                 oggbuf = para_realloc(oggbuf, *len);
 326                 oggbuf_len = *len;
 327         }
 328         ret = read(fileno(infile), oggbuf, *len);
 329         if (!ret) {
 330                 *len = 0;
 331                 return NULL;
 332         }
 333         if (ret < 0) {
 334                 *len = -E_OGG_READ;
 335                 return NULL;
 336         }
 337         if (ret != *len)
 338                 PARA_WARNING_LOG("short read (%d/%zd)\n", ret, *len);
 339         *len = ret;
 340         return oggbuf;
 341 }
 342
 343 static char *ogg_get_header_info(int *len)
 344 {
 345         *len = header_len;
 346         return header;
 347 }
 348
 349 static const char* ogg_suffixes[] = {"ogg", NULL};
 350 void ogg_init(struct audio_format_handler *p)
 351 {
 352         af = p;
 353         af->reposition_stream = ogg_reposition_stream;
 354         af->get_file_info = ogg_get_file_info,
 355         af->read_chunk = ogg_read_chunk;
 356         af->close_audio_file = ogg_close_audio_file;
 357         af->get_header_info = ogg_get_header_info;
 358         af->chunk_tv.tv_sec = 0;
 359         af->chunk_tv.tv_usec = 250 * 1000;
 360         tv_scale(3, &af->chunk_tv, &af->eof_tv);
 361         af->suffixes = ogg_suffixes;
 362 }