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 "afh.h"
  29 #include "error.h"
  30 #include "string.h"
  31 #include "fd.h"
  32
  33 /** must be big enough to hold header */
  34 #define CHUNK_SIZE 32768
  35 static double chunk_time = 0.25;
  36
  37 static OggVorbis_File *oggvorbis_file;
  38 static FILE *infile;
  39 static int header_len, inbuf_size, vi_channels;
  40 static char *header, *inbuf;
  41 static ssize_t *chunk_table, max_chunk_len, num_chunks;
  42 static struct audio_format_handler *af;
  43 static long vi_sampling_rate, vi_bitrate, vi_bitrate_nominal;
  44
  45 static int ogg_compute_header_len(void)
  46 {
  47         int ret, len, in = fileno(infile);
  48         unsigned int serial;
  49         char *buf;
  50         ogg_page page;
  51         ogg_packet packet;
  52         vorbis_comment vc;
  53         vorbis_info vi;
  54         ogg_stream_state *stream_in = para_malloc(sizeof(ogg_stream_state));
  55         ogg_stream_state *stream_out = para_malloc(sizeof(ogg_stream_state));
  56         ogg_sync_state *sync_in = para_malloc(sizeof(ogg_sync_state));
  57
  58         ogg_sync_init(sync_in);
  59         vorbis_info_init(&vi);
  60         vorbis_comment_init(&vc);
  61         buf = ogg_sync_buffer(sync_in, CHUNK_SIZE);
  62         len = read(in, buf, CHUNK_SIZE);
  63         ret = -E_OGG_READ;
  64         if (len <= 0)
  65                 goto err1;
  66         ogg_sync_wrote(sync_in, len);
  67         ret = -E_SYNC_PAGEOUT;
  68         if (ogg_sync_pageout(sync_in, &page) <= 0)
  69                 goto err1;
  70         serial = ogg_page_serialno(&page);
  71         ogg_stream_init(stream_in, serial);
  72         ogg_stream_init(stream_out, serial);
  73         ret = ogg_stream_pagein(stream_in, &page);
  74         if (ret < 0) {
  75                 ret = E_STREAM_PAGEIN;
  76                 goto err2;
  77         }
  78         ret = ogg_stream_packetout(stream_in, &packet);
  79         if (ret != 1) {
  80                 ret = -E_STREAM_PACKETOUT;
  81                 goto err2;
  82         }
  83         ret = -E_VORBIS;
  84         if (vorbis_synthesis_headerin(&vi, &vc, &packet) < 0)
  85                 goto err2;
  86         PARA_INFO_LOG("channels: %i, rate: %li\n", vi.channels, vi.rate);
  87         ogg_stream_packetin(stream_out, &packet);
  88
  89         ret = ogg_sync_pageout(sync_in, &page);
  90         if (ret <= 0) {
  91                 ret = -E_SYNC_PAGEOUT;
  92                 goto err2;
  93         }
  94         ogg_stream_pagein(stream_in, &page);
  95         ogg_stream_packetout(stream_in, &packet);
  96         ogg_stream_packetin(stream_out, &packet);
  97
  98         ret = ogg_sync_pageout(sync_in, &page);
  99         if (ret <= 0) {
 100                 ret = -E_SYNC_PAGEOUT;
 101                 goto err2;
 102         }
 103         ogg_stream_pagein(stream_in, &page);
 104         ogg_stream_packetout(stream_in, &packet);
 105         ogg_stream_packetin(stream_out, &packet);
 106
 107         header_len = 0;
 108         while (ogg_stream_flush(stream_out, &page))
 109                 header_len += page.body_len + page.header_len;
 110         ret = len;
 111         PARA_INFO_LOG("header_len = %d\n", header_len);
 112 err2:
 113         ogg_stream_destroy(stream_in);
 114         ogg_stream_destroy(stream_out);
 115 err1:
 116         ogg_sync_destroy(sync_in);
 117         vorbis_info_clear(&vi);
 118         vorbis_comment_clear(&vc);
 119         return ret;
 120 }
 121
 122 static void tunetable(void)
 123 {
 124         int i = 1, j = -1, lp = 1;
 125         while (i < num_chunks) {
 126                 if (chunk_table[i] == chunk_table[lp]) {
 127                         i++;
 128                         continue;
 129                 }
 130                 if (j < 0)
 131                         tv_scale(i, &af->chunk_tv, &af->eof_tv);
 132                 for (j = lp; j < i; j++)
 133                         chunk_table[j] = chunk_table[i];
 134                 lp = i;
 135         }
 136 #if 1
 137         for (i = 2; i < num_chunks; i++)
 138                 if (chunk_table[i] != chunk_table[1])
 139                         break;
 140         lp = i;
 141         for (i = 2; i < num_chunks - lp; i++)
 142                 chunk_table[i] = chunk_table[i + lp];
 143 #endif
 144 }
 145
 146
 147 /*
 148  * Alloc and fill array table of byte offsets. chunk_table[i] is the
 149  * offset in the current infile at which the sample containing time i *
 150  * CHUNK_TIME begins.
 151  */
 152 static void ogg_compute_chunk_table(double time_total)
 153 {
 154         int i, ret, num;
 155         ssize_t pos = 0, min = 0, old_pos;
 156
 157         old_pos = 0;
 158         ret = 0;
 159         num = time_total / chunk_time + 3;
 160         PARA_DEBUG_LOG("chunk time: %g allocating %d chunk pointers\n",
 161                 chunk_time, num);
 162         chunk_table = para_malloc(num * sizeof(size_t));
 163         chunk_table[0] = 0;
 164         max_chunk_len = 0;
 165         rewind(infile);
 166         for (i = 1; ret == 0; i++) {
 167                 ogg_int64_t diff;
 168                 ret = ov_time_seek(oggvorbis_file, i * chunk_time);
 169                 if (ret)
 170                         break;
 171                 pos = ov_raw_tell(oggvorbis_file);
 172                 diff = pos - old_pos;
 173                 max_chunk_len = PARA_MAX(max_chunk_len, diff);
 174                 min = (i == 1)? diff : PARA_MIN(min, diff);
 175                 chunk_table[i] = pos;
 176                 if (i < 11 || !((i - 1) % 1000)|| i > num - 11)
 177                         PARA_DEBUG_LOG("chunk #%d: %g secs, pos: %zd, "
 178                                 "size: %zd\n", i - 1,
 179                                 i * chunk_time, pos, pos - old_pos);
 180                 old_pos = pos;
 181         }
 182         num_chunks = i - 1;
 183         chunk_table[i] = pos;
 184         tunetable();
 185         PARA_INFO_LOG("%zu chunks (%fs), max chunk: %zd, min chunk: %zd\n",
 186                 num_chunks, chunk_time, max_chunk_len, min);
 187         rewind(infile);
 188 }
 189
 190 static void ogg_close_audio_file(void)
 191 {
 192         if (oggvorbis_file) {
 193                 PARA_DEBUG_LOG("%s", "ov_clear\n");
 194                 ov_clear(oggvorbis_file);
 195                 free(oggvorbis_file);
 196                 oggvorbis_file = NULL;
 197         }
 198         free(header);
 199         header = NULL;
 200         header_len = 0;
 201         free(chunk_table);
 202         chunk_table = NULL;
 203         num_chunks = 0;
 204         free(inbuf);
 205         inbuf = NULL;
 206         inbuf_size = 0;
 207 }
 208
 209 static int ogg_save_header(FILE *file, int len)
 210 {
 211         int ret;
 212
 213         header = para_malloc(len);
 214         rewind(file);
 215         ret = read(fileno(file), header, len);
 216         if (ret != len)
 217                 return -E_OGG_READ;
 218         return 1;
 219 }
 220
 221 /*
 222  * Init oggvorbis file and write some tech data to given pointers.
 223  */
 224 static int ogg_get_file_info(FILE *file, char *info_str, long unsigned *frames,
 225         int *seconds)
 226 {
 227         int ret;
 228         double time_total;
 229         vorbis_info *vi;
 230         ogg_int64_t raw_total;
 231
 232         infile = file;
 233         if (!file)
 234                 return -E_OGG_NO_FILE;
 235         ret = ogg_compute_header_len();
 236         if (ret < 0)
 237                 return ret;
 238         ret = ogg_save_header(file, header_len);
 239         if (ret < 0)
 240                 return ret;
 241         rewind(file);
 242         oggvorbis_file = para_malloc(sizeof(OggVorbis_File));
 243         ret = ov_open(file, oggvorbis_file, NULL, 0);
 244         if (ret < 0) {
 245                 free(oggvorbis_file);
 246                 free(header);
 247                 return -E_OGG_OPEN;
 248         }
 249         ret = -E_OGG_INFO;
 250         vi = ov_info(oggvorbis_file, 0);
 251         if (!vi)
 252                 goto err;
 253         time_total = ov_time_total(oggvorbis_file, -1);
 254         raw_total = ov_raw_total(oggvorbis_file, -1);
 255         *seconds = time_total;
 256         vi_sampling_rate = vi->rate;
 257         vi_bitrate = ov_bitrate(oggvorbis_file, 0);
 258         vi_bitrate_nominal = vi->bitrate_nominal;
 259         vi_channels = vi->channels;
 260         ogg_compute_chunk_table(time_total);
 261         *frames = num_chunks;
 262         sprintf(info_str, "audio_file_info1:%zu x %lu, %ldkHz, %d channels, %ldkbps\n"
 263                 "audio_file_info2: \n"
 264                 "audio_file_info3: \n",
 265                 num_chunks, (long unsigned) (chunk_time * 1000 * 1000),
 266                 vi_sampling_rate / 1000, vi_channels, vi_bitrate / 1000
 267                 );
 268         rewind(file);
 269         return 1;
 270 err:
 271         ogg_close_audio_file();
 272         return ret;
 273 }
 274
 275 static char *ogg_read_chunk(long unsigned current_chunk, ssize_t *len)
 276 {
 277         int ret;
 278         size_t pos;
 279
 280         *len = 0;
 281         if (current_chunk >= num_chunks)
 282                 return NULL;
 283         *len = chunk_table[current_chunk + 1] - chunk_table[current_chunk];
 284         if (!*len) /* nothing to send for this run */
 285                 return inbuf;
 286         pos = chunk_table[current_chunk];
 287         if (inbuf_size < *len) {
 288                 PARA_INFO_LOG("increasing inbuf for chunk #%lu/%zu to %zd bytes\n",
 289                         current_chunk, num_chunks, *len);
 290                 inbuf = para_realloc(inbuf, *len);
 291                 inbuf_size = *len;
 292         }
 293 //      PARA_DEBUG_LOG("reading chunk #%lu@%zd (%zd bytes)\n", current_chunk,
 294 //              pos, *len);
 295         ret = fseek(infile, pos, SEEK_SET);
 296         if (ret < 0)
 297                 return NULL;
 298         ret = para_fread(inbuf, *len, 1, infile);
 299         if (ret != *len)
 300                 return NULL;
 301 //      PARA_DEBUG_LOG("ret: %d, inbuf[0]: %lx - %lx\n", ret, (long unsigned) inbuf[0],
 302 //              (long unsigned) inbuf[4]);
 303         return (char *)inbuf;
 304 }
 305
 306 static char *ogg_get_header_info(int *len)
 307 {
 308         *len = header_len;
 309         return header;
 310 }
 311
 312 static const char* ogg_suffixes[] = {"ogg", NULL};
 313
 314 /**
 315  * the init function of the ogg vorbis audio format handler
 316  *
 317  * \param p pointer to the struct to initialize
 318  */
 319 void ogg_init(struct audio_format_handler *p)
 320 {
 321         af = p;
 322         af->get_file_info = ogg_get_file_info,
 323         af->read_chunk = ogg_read_chunk;
 324         af->close_audio_file = ogg_close_audio_file;
 325         af->get_header_info = ogg_get_header_info;
 326         af->chunk_tv.tv_sec = 0;
 327         af->chunk_tv.tv_usec = 250 * 1000;
 328         tv_scale(3, &af->chunk_tv, &af->eof_tv);
 329         af->suffixes = ogg_suffixes;
 330 }