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 int header_len;
  39 static char *header;
  40 static ssize_t *chunk_table, num_chunks;
  41 static struct audio_format_handler *af;
  42 static long vi_sampling_rate, vi_bitrate, vi_bitrate_nominal;
  43
  44 static int ogg_compute_header_len(FILE *file)
  45 {
  46         int ret, len, in = fileno(file);
  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         PARA_INFO_LOG("channels: %i, rate: %li\n", vi.channels, vi.rate);
  86         ogg_stream_packetin(stream_out, &packet);
  87
  88         ret = ogg_sync_pageout(sync_in, &page);
  89         if (ret <= 0) {
  90                 ret = -E_SYNC_PAGEOUT;
  91                 goto err2;
  92         }
  93         ogg_stream_pagein(stream_in, &page);
  94         ogg_stream_packetout(stream_in, &packet);
  95         ogg_stream_packetin(stream_out, &packet);
  96
  97         ret = ogg_sync_pageout(sync_in, &page);
  98         if (ret <= 0) {
  99                 ret = -E_SYNC_PAGEOUT;
 100                 goto err2;
 101         }
 102         ogg_stream_pagein(stream_in, &page);
 103         ogg_stream_packetout(stream_in, &packet);
 104         ogg_stream_packetin(stream_out, &packet);
 105
 106         header_len = 0;
 107         while (ogg_stream_flush(stream_out, &page))
 108                 header_len += page.body_len + page.header_len;
 109         ret = len;
 110         PARA_INFO_LOG("header_len = %d\n", header_len);
 111 err2:
 112         ogg_stream_destroy(stream_in);
 113         ogg_stream_destroy(stream_out);
 114 err1:
 115         ogg_sync_destroy(sync_in);
 116         vorbis_info_clear(&vi);
 117         vorbis_comment_clear(&vc);
 118         return ret;
 119 }
 120
 121 static void tunetable(void)
 122 {
 123         int i = 1, j = -1, lp = 1;
 124         while (i < num_chunks) {
 125                 if (chunk_table[i] == chunk_table[lp]) {
 126                         i++;
 127                         continue;
 128                 }
 129                 if (j < 0)
 130                         tv_scale(i, &af->chunk_tv, &af->eof_tv);
 131                 for (j = lp; j < i; j++)
 132                         chunk_table[j] = chunk_table[i];
 133                 lp = i;
 134         }
 135 #if 1
 136         for (i = 2; i < num_chunks; i++)
 137                 if (chunk_table[i] != chunk_table[1])
 138                         break;
 139         lp = i;
 140         for (i = 2; i < num_chunks - lp; i++)
 141                 chunk_table[i] = chunk_table[i + lp];
 142 #endif
 143 }
 144
 145
 146 /*
 147  * Alloc and fill array table of byte offsets. chunk_table[i] is the
 148  * offset in the current input file at which the sample containing time i *
 149  * CHUNK_TIME begins.
 150  */
 151 static void ogg_compute_chunk_table(double time_total)
 152 {
 153         int i, ret, num;
 154         ssize_t max_chunk_len, pos = 0, min = 0, old_pos;
 155
 156         old_pos = 0;
 157         ret = 0;
 158         num = time_total / chunk_time + 3;
 159         PARA_DEBUG_LOG("chunk time: %g allocating %d chunk pointers\n",
 160                 chunk_time, num);
 161         chunk_table = para_malloc(num * sizeof(size_t));
 162         chunk_table[0] = 0;
 163         max_chunk_len = 0;
 164         for (i = 1; ret == 0; i++) {
 165                 ogg_int64_t diff;
 166                 ret = ov_time_seek(oggvorbis_file, i * chunk_time);
 167                 if (ret)
 168                         break;
 169                 pos = ov_raw_tell(oggvorbis_file);
 170                 diff = pos - old_pos;
 171                 max_chunk_len = PARA_MAX(max_chunk_len, diff);
 172                 min = (i == 1)? diff : PARA_MIN(min, diff);
 173                 chunk_table[i] = pos;
 174                 if (i < 11 || !((i - 1) % 1000)|| i > num - 11)
 175                         PARA_DEBUG_LOG("chunk #%d: %g secs, pos: %zd, "
 176                                 "size: %zd\n", i - 1,
 177                                 i * chunk_time, pos, pos - old_pos);
 178                 old_pos = pos;
 179         }
 180         num_chunks = i - 1;
 181         chunk_table[i] = pos;
 182         tunetable();
 183         PARA_INFO_LOG("%zu chunks (%fs), max chunk: %zd, min chunk: %zd\n",
 184                 num_chunks, chunk_time, max_chunk_len, min);
 185 }
 186
 187 static void ogg_close_audio_file(void)
 188 {
 189         if (oggvorbis_file) {
 190                 PARA_DEBUG_LOG("%s", "ov_clear\n");
 191                 ov_clear(oggvorbis_file);
 192                 free(oggvorbis_file);
 193                 oggvorbis_file = NULL;
 194         }
 195         free(header);
 196         header = NULL;
 197         header_len = 0;
 198         free(chunk_table);
 199         chunk_table = NULL;
 200         num_chunks = 0;
 201 }
 202
 203 static int ogg_save_header(FILE *file, int len)
 204 {
 205         int ret;
 206
 207         header = para_malloc(len);
 208         rewind(file);
 209         ret = read(fileno(file), header, len);
 210         if (ret != len)
 211                 return -E_OGG_READ;
 212         return 1;
 213 }
 214
 215 /*
 216  * Init oggvorbis file and write some tech data to given pointers.
 217  */
 218 static int ogg_get_file_info(FILE *file, char *info_str, long unsigned *frames,
 219         int *seconds, size_t **vss_chunk_table)
 220 {
 221         int ret;
 222         double time_total;
 223         vorbis_info *vi;
 224         ogg_int64_t raw_total;
 225
 226         if (!file)
 227                 return -E_OGG_NO_FILE;
 228         ret = ogg_compute_header_len(file);
 229         if (ret < 0)
 230                 return ret;
 231         ret = ogg_save_header(file, header_len);
 232         if (ret < 0)
 233                 return ret;
 234         rewind(file);
 235         oggvorbis_file = para_malloc(sizeof(OggVorbis_File));
 236         ret = ov_open(file, oggvorbis_file, NULL, 0);
 237         if (ret < 0) {
 238                 free(oggvorbis_file);
 239                 free(header);
 240                 return -E_OGG_OPEN;
 241         }
 242         ret = -E_OGG_INFO;
 243         vi = ov_info(oggvorbis_file, 0);
 244         if (!vi)
 245                 goto err;
 246         time_total = ov_time_total(oggvorbis_file, -1);
 247         raw_total = ov_raw_total(oggvorbis_file, -1);
 248         *seconds = time_total;
 249         vi_sampling_rate = vi->rate;
 250         vi_bitrate = ov_bitrate(oggvorbis_file, 0);
 251         vi_bitrate_nominal = vi->bitrate_nominal;
 252         rewind(file);
 253         ogg_compute_chunk_table(time_total);
 254         rewind(file);
 255         *frames = num_chunks;
 256         *vss_chunk_table = chunk_table;
 257         sprintf(info_str, "audio_file_info1:%zu x %lu, %ldkHz, %d channels, %ldkbps\n"
 258                 "audio_file_info2: \n"
 259                 "audio_file_info3: \n",
 260                 num_chunks, (long unsigned) (chunk_time * 1000 * 1000),
 261                 vi_sampling_rate / 1000, vi->channels, vi_bitrate / 1000
 262                 );
 263         rewind(file);
 264         return 1;
 265 err:
 266         ogg_close_audio_file();
 267         return ret;
 268 }
 269
 270 static char *ogg_get_header_info(int *len)
 271 {
 272         *len = header_len;
 273         return header;
 274 }
 275
 276 static const char* ogg_suffixes[] = {"ogg", NULL};
 277
 278 /**
 279  * the init function of the ogg vorbis audio format handler
 280  *
 281  * \param p pointer to the struct to initialize
 282  */
 283 void ogg_init(struct audio_format_handler *p)
 284 {
 285         af = p;
 286         af->get_file_info = ogg_get_file_info,
 287         af->close_audio_file = ogg_close_audio_file;
 288         af->get_header_info = ogg_get_header_info;
 289         af->chunk_tv.tv_sec = 0;
 290         af->chunk_tv.tv_usec = 250 * 1000;
 291         tv_scale(3, &af->chunk_tv, &af->eof_tv);
 292         af->suffixes = ogg_suffixes;
 293 }