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 static struct audio_format_handler *af;
  37
  38 static size_t cb_read(void *buf, size_t size, size_t nmemb, void *datasource)
  39 {
  40         FILE *f = datasource;
  41         return fread(buf, size, nmemb, f);
  42 }
  43
  44 static int cb_seek(__a_unused void *datasource, ogg_int64_t offset,
  45                 int whence)
  46 {
  47         FILE *f = datasource;
  48         return fseek(f, offset, whence);
  49 }
  50
  51 /* don't do anything as vss still needs the open filehandle */
  52 static int cb_close(__a_unused void *datasource)
  53 {
  54         return 0;
  55 }
  56
  57 long cb_tell(void *datasource)
  58 {
  59         FILE *f = datasource;
  60         return ftell(f);
  61 }
  62
  63 int ogg_open_callbacks(void *datasource, OggVorbis_File *vf, ov_callbacks c)
  64 {
  65         int ret = ov_open_callbacks(datasource, vf,
  66                 NULL, /* no initial buffer */
  67                 0, /* no initial bytes */
  68                 c); /* the ov_open_callbacks */
  69
  70         /* FIXME: provide better error codes */
  71         if (ret == OV_EREAD)
  72                 return -E_OGG_READ;
  73         if (ret == OV_ENOTVORBIS)
  74                 return -E_OGG_READ;
  75         if (ret == OV_EVERSION)
  76                 return -E_OGG_READ;
  77         if (ret == OV_EBADHEADER)
  78                 return -E_OGG_READ;
  79         if (ret < 0)
  80                 return -E_OGG_READ;
  81         return 1;
  82
  83 }
  84
  85 static int ogg_save_header(FILE *file, struct audio_format_info *afi)
  86 {
  87         int ret;
  88
  89         afi->header = para_malloc(afi->header_len);
  90         rewind(file);
  91         ret = read(fileno(file), afi->header, afi->header_len);
  92         if (ret == afi->header_len)
  93                 return 1;
  94         free(afi->header);
  95         return -E_OGG_READ;
  96 }
  97
  98 static int ogg_compute_header_len(FILE *file, struct audio_format_info *afi)
  99 {
 100         int ret, len, in = fileno(file);
 101         unsigned int serial;
 102         char *buf;
 103         ogg_page page;
 104         ogg_packet packet;
 105         vorbis_comment vc;
 106         vorbis_info vi;
 107         ogg_stream_state *stream_in = para_malloc(sizeof(ogg_stream_state));
 108         ogg_stream_state *stream_out = para_malloc(sizeof(ogg_stream_state));
 109         ogg_sync_state *sync_in = para_malloc(sizeof(ogg_sync_state));
 110
 111         ogg_sync_init(sync_in);
 112         vorbis_info_init(&vi);
 113         vorbis_comment_init(&vc);
 114         buf = ogg_sync_buffer(sync_in, CHUNK_SIZE);
 115         len = read(in, buf, CHUNK_SIZE);
 116         ret = -E_OGG_READ;
 117         if (len <= 0)
 118                 goto err1;
 119         ogg_sync_wrote(sync_in, len);
 120         ret = -E_SYNC_PAGEOUT;
 121         if (ogg_sync_pageout(sync_in, &page) <= 0)
 122                 goto err1;
 123         serial = ogg_page_serialno(&page);
 124         ogg_stream_init(stream_in, serial);
 125         ogg_stream_init(stream_out, serial);
 126         ret = ogg_stream_pagein(stream_in, &page);
 127         if (ret < 0) {
 128                 ret = E_STREAM_PAGEIN;
 129                 goto err2;
 130         }
 131         ret = ogg_stream_packetout(stream_in, &packet);
 132         if (ret != 1) {
 133                 ret = -E_STREAM_PACKETOUT;
 134                 goto err2;
 135         }
 136         ret = -E_VORBIS;
 137         if (vorbis_synthesis_headerin(&vi, &vc, &packet) < 0)
 138                 goto err2;
 139         PARA_INFO_LOG("channels: %i, rate: %li\n", vi.channels, vi.rate);
 140         ogg_stream_packetin(stream_out, &packet);
 141
 142         ret = ogg_sync_pageout(sync_in, &page);
 143         if (ret <= 0) {
 144                 ret = -E_SYNC_PAGEOUT;
 145                 goto err2;
 146         }
 147         ogg_stream_pagein(stream_in, &page);
 148         ogg_stream_packetout(stream_in, &packet);
 149         ogg_stream_packetin(stream_out, &packet);
 150
 151         ret = ogg_sync_pageout(sync_in, &page);
 152         if (ret <= 0) {
 153                 ret = -E_SYNC_PAGEOUT;
 154                 goto err2;
 155         }
 156         ogg_stream_pagein(stream_in, &page);
 157         ogg_stream_packetout(stream_in, &packet);
 158         ogg_stream_packetin(stream_out, &packet);
 159
 160         afi->header_len = 0;
 161         while (ogg_stream_flush(stream_out, &page))
 162                 afi->header_len += page.body_len + page.header_len;
 163         PARA_INFO_LOG("header_len = %d\n", afi->header_len);
 164         ret = ogg_save_header(file, afi);
 165 err2:
 166         ogg_stream_destroy(stream_in);
 167         ogg_stream_destroy(stream_out);
 168 err1:
 169         ogg_sync_destroy(sync_in);
 170         vorbis_info_clear(&vi);
 171         vorbis_comment_clear(&vc);
 172         return ret;
 173 }
 174
 175 /*
 176  * Alloc and fill array table of byte offsets. chunk_table[i] is the
 177  * offset in the current input file at which the sample containing time i *
 178  * CHUNK_TIME begins. Always successful.
 179  */
 180 static long unsigned ogg_compute_chunk_table(OggVorbis_File *of,
 181         struct audio_format_info *afi, double time_total)
 182 {
 183         int i, ret, num;
 184         ssize_t max_chunk_len, pos = 0, min = 0, old_pos;
 185         long unsigned num_chunks;
 186
 187         old_pos = 0;
 188         ret = 0;
 189         num = time_total / chunk_time + 3;
 190         PARA_DEBUG_LOG("chunk time: %g allocating %d chunk pointers\n",
 191                 chunk_time, num);
 192         afi->chunk_table = para_malloc(num * sizeof(size_t));
 193         afi->chunk_table[0] = 0;
 194         max_chunk_len = 0;
 195         for (i = 1; ret == 0; i++) {
 196                 ogg_int64_t diff;
 197                 ret = ov_time_seek(of, i * chunk_time);
 198                 if (ret)
 199                         break;
 200                 pos = ov_raw_tell(of);
 201                 diff = pos - old_pos;
 202                 max_chunk_len = PARA_MAX(max_chunk_len, diff);
 203                 min = (i == 1)? diff : PARA_MIN(min, diff);
 204                 afi->chunk_table[i] = pos;
 205                 if (i < 11 || !((i - 1) % 1000)|| i > num - 11)
 206                         PARA_DEBUG_LOG("chunk #%d: %g secs, pos: %zd, "
 207                                 "size: %zd\n", i - 1,
 208                                 i * chunk_time, pos, pos - old_pos);
 209                 old_pos = pos;
 210         }
 211         num_chunks = i - 1;
 212         afi->chunk_table[i] = pos;
 213         PARA_INFO_LOG("%lu chunks (%fs), max chunk: %zd, min chunk: %zd\n",
 214                 num_chunks, chunk_time, max_chunk_len, min);
 215         return num_chunks;
 216 }
 217
 218 static void ogg_close_audio_file(void)
 219 {
 220         fclose(audio_file);
 221 }
 222
 223 /*
 224  * Init oggvorbis file and write some tech data to given pointers.
 225  */
 226 static int ogg_get_file_info(FILE *file, struct audio_format_info *afi)
 227 {
 228         int ret;
 229         double time_total;
 230         vorbis_info *vi;
 231         ogg_int64_t raw_total;
 232         long vi_sampling_rate, vi_bitrate;
 233         OggVorbis_File of;
 234         static const ov_callbacks ovc = {
 235                 .read_func = cb_read,
 236                 .seek_func = cb_seek,
 237                 .close_func = cb_close,
 238                 .tell_func = cb_tell
 239         };
 240
 241         if (!file)
 242                 return -E_OGG_NO_FILE;
 243         ret = ogg_compute_header_len(file, afi);
 244         if (ret < 0)
 245                 return ret;
 246         rewind(file);
 247         ret = ogg_open_callbacks(file, &of, ovc);
 248         if (ret < 0)
 249                 goto err;
 250         ret = -E_OGG_INFO;
 251         vi = ov_info(&of, 0);
 252         if (!vi)
 253                 goto err;
 254         time_total = ov_time_total(&of, -1);
 255         raw_total = ov_raw_total(&of, -1);
 256         afi->seconds_total = time_total;
 257         vi_sampling_rate = vi->rate;
 258         vi_bitrate = ov_bitrate(&of, 0);
 259         rewind(file);
 260         afi->chunks_total = ogg_compute_chunk_table(&of, afi, time_total);
 261         rewind(file);
 262         sprintf(afi->info_string, "audio_file_info1:%lu x %lu, %ldkHz, "
 263                 "%d channels, %ldkbps\n"
 264                 "audio_file_info2: \n"
 265                 "audio_file_info3: \n",
 266                 afi->chunks_total, (long unsigned) (chunk_time * 1000 * 1000),
 267                 vi_sampling_rate / 1000, vi->channels, vi_bitrate / 1000
 268                 );
 269         rewind(file);
 270         audio_file = file;
 271         afi->chunk_tv.tv_sec = 0;
 272         afi->chunk_tv.tv_usec = 250 * 1000;
 273         tv_scale(3, &afi->chunk_tv, &afi->eof_tv);
 274         ret = 1;
 275 err:
 276         ov_clear(&of); /* keeps the file open */
 277         if (ret < 0)
 278                 free(afi->header);
 279         return ret;
 280 }
 281
 282 static const char* ogg_suffixes[] = {"ogg", NULL};
 283
 284 /**
 285  * the init function of the ogg vorbis audio format handler
 286  *
 287  * \param p pointer to the struct to initialize
 288  */
 289 void ogg_init(struct audio_format_handler *p)
 290 {
 291         af = p;
 292         af->get_file_info = ogg_get_file_info,
 293         af->close_audio_file = ogg_close_audio_file;
 294         af->suffixes = ogg_suffixes;
 295 }