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