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
  32 /** must be big enough to hold header */
  33 #define CHUNK_SIZE 32768
  34 static double chunk_time = 0.25;
  35
  36 FILE *audio_file;
  37 static int header_len;
  38 static char *header;
  39 static ssize_t *chunk_table;
  40 static struct audio_format_handler *af;
  41
  42 static size_t cb_read(void *buf, size_t size, size_t nmemb, void *datasource)
  43 {
  44         FILE *f = datasource;
  45         return fread(buf, size, nmemb, f);
  46 }
  47
  48 static int cb_seek(__a_unused void *datasource, ogg_int64_t offset,
  49                 int whence)
  50 {
  51         FILE *f = datasource;
  52         return fseek(f, offset, whence);
  53 }
  54
  55 /* don't do anything as vss still needs the open filehandle */
  56 static int cb_close(__a_unused void *datasource)
  57 {
  58         return 0;
  59 }
  60
  61 long cb_tell(void *datasource)
  62 {
  63         FILE *f = datasource;
  64         return ftell(f);
  65 }
  66
  67 int ogg_open_callbacks(void *datasource, OggVorbis_File *vf, ov_callbacks c)
  68 {
  69         int ret = ov_open_callbacks(datasource, vf,
  70                 NULL, /* no initial buffer */
  71                 0, /* no initial bytes */
  72                 c); /* the ov_open_callbacks */
  73
  74         /* FIXME: provide better error codes */
  75         if (ret == OV_EREAD)
  76                 return -E_OGG_READ;
  77         if (ret == OV_ENOTVORBIS)
  78                 return -E_OGG_READ;
  79         if (ret == OV_EVERSION)
  80                 return -E_OGG_READ;
  81         if (ret == OV_EBADHEADER)
  82                 return -E_OGG_READ;
  83         if (ret < 0)
  84                 return -E_OGG_READ;
  85         return 1;
  86
  87 }
  88
  89 static int ogg_compute_header_len(FILE *file)
  90 {
  91         int ret, len, in = fileno(file);
  92         unsigned int serial;
  93         char *buf;
  94         ogg_page page;
  95         ogg_packet packet;
  96         vorbis_comment vc;
  97         vorbis_info vi;
  98         ogg_stream_state *stream_in = para_malloc(sizeof(ogg_stream_state));
  99         ogg_stream_state *stream_out = para_malloc(sizeof(ogg_stream_state));
 100         ogg_sync_state *sync_in = para_malloc(sizeof(ogg_sync_state));
 101
 102         ogg_sync_init(sync_in);
 103         vorbis_info_init(&vi);
 104         vorbis_comment_init(&vc);
 105         buf = ogg_sync_buffer(sync_in, CHUNK_SIZE);
 106         len = read(in, buf, CHUNK_SIZE);
 107         ret = -E_OGG_READ;
 108         if (len <= 0)
 109                 goto err1;
 110         ogg_sync_wrote(sync_in, len);
 111         ret = -E_SYNC_PAGEOUT;
 112         if (ogg_sync_pageout(sync_in, &page) <= 0)
 113                 goto err1;
 114         serial = ogg_page_serialno(&page);
 115         ogg_stream_init(stream_in, serial);
 116         ogg_stream_init(stream_out, serial);
 117         ret = ogg_stream_pagein(stream_in, &page);
 118         if (ret < 0) {
 119                 ret = E_STREAM_PAGEIN;
 120                 goto err2;
 121         }
 122         ret = ogg_stream_packetout(stream_in, &packet);
 123         if (ret != 1) {
 124                 ret = -E_STREAM_PACKETOUT;
 125                 goto err2;
 126         }
 127         ret = -E_VORBIS;
 128         if (vorbis_synthesis_headerin(&vi, &vc, &packet) < 0)
 129                 goto err2;
 130         PARA_INFO_LOG("channels: %i, rate: %li\n", vi.channels, vi.rate);
 131         ogg_stream_packetin(stream_out, &packet);
 132
 133         ret = ogg_sync_pageout(sync_in, &page);
 134         if (ret <= 0) {
 135                 ret = -E_SYNC_PAGEOUT;
 136                 goto err2;
 137         }
 138         ogg_stream_pagein(stream_in, &page);
 139         ogg_stream_packetout(stream_in, &packet);
 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         header_len = 0;
 152         while (ogg_stream_flush(stream_out, &page))
 153                 header_len += page.body_len + page.header_len;
 154         ret = len;
 155         PARA_INFO_LOG("header_len = %d\n", header_len);
 156 err2:
 157         ogg_stream_destroy(stream_in);
 158         ogg_stream_destroy(stream_out);
 159 err1:
 160         ogg_sync_destroy(sync_in);
 161         vorbis_info_clear(&vi);
 162         vorbis_comment_clear(&vc);
 163         return ret;
 164 }
 165
 166 /*
 167  * Alloc and fill array table of byte offsets. chunk_table[i] is the
 168  * offset in the current input file at which the sample containing time i *
 169  * CHUNK_TIME begins. Always successful.
 170  */
 171 static long unsigned ogg_compute_chunk_table(OggVorbis_File *of,
 172         double time_total)
 173 {
 174         int i, ret, num;
 175         ssize_t max_chunk_len, pos = 0, min = 0, old_pos;
 176         long unsigned num_chunks;
 177
 178         old_pos = 0;
 179         ret = 0;
 180         num = time_total / chunk_time + 3;
 181         PARA_DEBUG_LOG("chunk time: %g allocating %d chunk pointers\n",
 182                 chunk_time, num);
 183         chunk_table = para_malloc(num * sizeof(size_t));
 184         chunk_table[0] = 0;
 185         max_chunk_len = 0;
 186         for (i = 1; ret == 0; i++) {
 187                 ogg_int64_t diff;
 188                 ret = ov_time_seek(of, i * chunk_time);
 189                 if (ret)
 190                         break;
 191                 pos = ov_raw_tell(of);
 192                 diff = pos - old_pos;
 193                 max_chunk_len = PARA_MAX(max_chunk_len, diff);
 194                 min = (i == 1)? diff : PARA_MIN(min, diff);
 195                 chunk_table[i] = pos;
 196                 if (i < 11 || !((i - 1) % 1000)|| i > num - 11)
 197                         PARA_DEBUG_LOG("chunk #%d: %g secs, pos: %zd, "
 198                                 "size: %zd\n", i - 1,
 199                                 i * chunk_time, pos, pos - old_pos);
 200                 old_pos = pos;
 201         }
 202         num_chunks = i - 1;
 203         chunk_table[i] = pos;
 204         PARA_INFO_LOG("%lu chunks (%fs), max chunk: %zd, min chunk: %zd\n",
 205                 num_chunks, chunk_time, max_chunk_len, min);
 206         return num_chunks;
 207 }
 208
 209 static void ogg_close_audio_file(void)
 210 {
 211         free(header);
 212         free(chunk_table);
 213         fclose(audio_file);
 214 }
 215
 216 static int ogg_save_header(FILE *file, int len)
 217 {
 218         int ret;
 219
 220         header = para_malloc(len);
 221         rewind(file);
 222         ret = read(fileno(file), header, len);
 223         if (ret == len)
 224                 return 1;
 225         free(header);
 226         return -E_OGG_READ;
 227 }
 228
 229 /*
 230  * Init oggvorbis file and write some tech data to given pointers.
 231  */
 232 static int ogg_get_file_info(FILE *file, char *info_str, long unsigned *frames,
 233         int *seconds, size_t **vss_chunk_table)
 234 {
 235         int ret;
 236         double time_total;
 237         vorbis_info *vi;
 238         ogg_int64_t raw_total;
 239         long vi_sampling_rate, vi_bitrate;
 240         OggVorbis_File of;
 241         static const ov_callbacks ovc = {
 242                 .read_func = cb_read,
 243                 .seek_func = cb_seek,
 244                 .close_func = cb_close,
 245                 .tell_func = cb_tell
 246         };
 247
 248         if (!file)
 249                 return -E_OGG_NO_FILE;
 250         ret = ogg_compute_header_len(file);
 251         if (ret < 0)
 252                 return ret;
 253         ret = ogg_save_header(file, header_len);
 254         if (ret < 0)
 255                 return ret;
 256         rewind(file);
 257         ret = ogg_open_callbacks(file, &of, ovc);
 258         if (ret < 0)
 259                 goto err;
 260         ret = -E_OGG_INFO;
 261         vi = ov_info(&of, 0);
 262         if (!vi)
 263                 goto err;
 264         time_total = ov_time_total(&of, -1);
 265         raw_total = ov_raw_total(&of, -1);
 266         *seconds = time_total;
 267         vi_sampling_rate = vi->rate;
 268         vi_bitrate = ov_bitrate(&of, 0);
 269         rewind(file);
 270         *frames = ogg_compute_chunk_table(&of, time_total);
 271         rewind(file);
 272         *vss_chunk_table = chunk_table;
 273         sprintf(info_str, "audio_file_info1:%lu x %lu, %ldkHz, %d channels, %ldkbps\n"
 274                 "audio_file_info2: \n"
 275                 "audio_file_info3: \n",
 276                 *frames, (long unsigned) (chunk_time * 1000 * 1000),
 277                 vi_sampling_rate / 1000, vi->channels, vi_bitrate / 1000
 278                 );
 279         rewind(file);
 280         audio_file = file;
 281         ret = 1;
 282 err:
 283         ov_clear(&of); /* keeps the file open */
 284         if (ret < 0)
 285                 free(header);
 286         return ret;
 287 }
 288
 289 static char *ogg_get_header_info(int *len)
 290 {
 291         *len = header_len;
 292         return header;
 293 }
 294
 295 static const char* ogg_suffixes[] = {"ogg", NULL};
 296
 297 /**
 298  * the init function of the ogg vorbis audio format handler
 299  *
 300  * \param p pointer to the struct to initialize
 301  */
 302 void ogg_init(struct audio_format_handler *p)
 303 {
 304         af = p;
 305         af->get_file_info = ogg_get_file_info,
 306         af->close_audio_file = ogg_close_audio_file;
 307         af->get_header_info = ogg_get_header_info;
 308         af->chunk_tv.tv_sec = 0;
 309         af->chunk_tv.tv_usec = 250 * 1000;
 310         tv_scale(3, &af->chunk_tv, &af->eof_tv);
 311         af->suffixes = ogg_suffixes;
 312 }