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