ogg_afh.c

   1 /*
   2  * Copyright (C) 2004-2007 Andre Noll <maan@systemlinux.org>
   3  *
   4  * Licensed under the GPL v2. For licencing details see COPYING.
   5  */
   6 /** \file ogg_afh.c para_server's ogg vorbis audio format handler */
   7
   8 #include <inttypes.h>
   9 #include <ogg/ogg.h>
  10 #include <vorbis/codec.h>
  11 #include <vorbis/vorbisfile.h>
  12
  13 #include "para.h"
  14 #include "afh.h"
  15 #include "server.h"
  16 #include "error.h"
  17 #include "string.h"
  18
  19 /** must be big enough to hold header */
  20 #define CHUNK_SIZE 32768
  21 static double chunk_time = 0.25;
  22
  23 /** describes a memory-mapped ogg vorbis file */
  24 struct ogg_datasource {
  25         /** the memory mapping */
  26         char *map;
  27         /** this size of the mapping */
  28         off_t numbytes;
  29         /** the current position in the mapping */
  30         off_t fpos;
  31 };
  32
  33 static size_t cb_read(void *buf, size_t size, size_t nmemb, void *datasource)
  34 {
  35         struct ogg_datasource *ods = datasource;
  36         size_t copy = PARA_MIN(ods->numbytes - ods->fpos, size * nmemb),
  37                 ret = copy / size;
  38         if (!ret)
  39                 return 0;
  40         memcpy(buf, ods->map + ods->fpos, copy);
  41 //      PARA_INFO_LOG("size: %zd, nmemb: %zd, ret: %zd\n", size, nmemb, ret);
  42         ods->fpos += ret * size;
  43         return ret;
  44 }
  45
  46 static int cb_seek(void *datasource, ogg_int64_t offset,
  47                 int whence)
  48 {
  49         struct ogg_datasource *ods = datasource;
  50         switch (whence) {
  51         case SEEK_SET:
  52                 if (offset >= 0 && offset <= ods->numbytes) {
  53                         ods->fpos = offset;
  54                         return 0;
  55                 }
  56                 errno = EINVAL;
  57                 return -1;
  58                 break;
  59         case SEEK_END:
  60                 if (offset <= 0 && -offset <= ods->numbytes) {
  61                         ods->fpos = ods->numbytes + offset;
  62                         return 0;
  63                 }
  64                 errno = EINVAL;
  65                 return -1;
  66                 break;
  67         case SEEK_CUR:
  68                 if ((offset >= 0 && offset + ods->fpos > ods->numbytes) ||
  69                                 (offset < 0 && offset + ods->fpos < 0)) {
  70                         errno = EINVAL;
  71                         return -1;
  72                 }
  73                 ods->fpos += offset;
  74                 return 0;
  75         }
  76         errno = EINVAL;
  77         return -1;
  78 }
  79
  80 /* don't do anything as vss still needs the open filehandle */
  81 static int cb_close(__a_unused void *datasource)
  82 {
  83         return 0;
  84 }
  85
  86 static long cb_tell(void *datasource)
  87 {
  88         struct ogg_datasource *ods = datasource;
  89         return (unsigned long)ods->fpos;
  90 }
  91
  92 static int ogg_open_callbacks(void *datasource, OggVorbis_File *vf, ov_callbacks c)
  93 {
  94         int ret = ov_open_callbacks(datasource, vf,
  95                 NULL, /* no initial buffer */
  96                 0, /* no initial bytes */
  97                 c); /* the ov_open_callbacks */
  98
  99         if (ret == OV_EREAD)
 100                 return -E_OGG_READ;
 101         if (ret == OV_ENOTVORBIS)
 102                 return -E_VORBIS;
 103         if (ret == OV_EVERSION)
 104                 return -E_OGG_VERSION;
 105         if (ret == OV_EBADHEADER)
 106                 return -E_OGG_BAD_HEADER;
 107         if (ret < 0)
 108                 return -E_OGG_UNKNOWN_ERROR;
 109         return 1;
 110
 111 }
 112
 113 static int ogg_compute_header_len(char *map, size_t numbytes,
 114                 struct audio_format_info *afi)
 115 {
 116         int ret;
 117         size_t len = PARA_MIN(numbytes, CHUNK_SIZE);
 118         int serial;
 119         char *buf;
 120
 121         ogg_page page;
 122         ogg_packet packet;
 123         vorbis_comment vc;
 124         vorbis_info vi;
 125         ogg_stream_state *stream_in = para_malloc(sizeof(ogg_stream_state));
 126         ogg_stream_state *stream_out = para_malloc(sizeof(ogg_stream_state));
 127         ogg_sync_state *sync_in = para_malloc(sizeof(ogg_sync_state));
 128
 129         ogg_sync_init(sync_in);
 130         vorbis_info_init(&vi);
 131         vorbis_comment_init(&vc);
 132         buf = ogg_sync_buffer(sync_in, (long)len);
 133         memcpy(buf, map, len);
 134         ogg_sync_wrote(sync_in, (long)len);
 135         ret = -E_SYNC_PAGEOUT;
 136         if (ogg_sync_pageout(sync_in, &page) <= 0) {
 137                 free(stream_in);
 138                 free(stream_out);
 139                 goto err1;
 140         }
 141         serial = ogg_page_serialno(&page);
 142         ogg_stream_init(stream_in, serial);
 143         ogg_stream_init(stream_out, serial);
 144         ret = ogg_stream_pagein(stream_in, &page);
 145         if (ret < 0) {
 146                 ret = -E_STREAM_PAGEIN;
 147                 goto err2;
 148         }
 149         ret = ogg_stream_packetout(stream_in, &packet);
 150         if (ret != 1) {
 151                 ret = -E_STREAM_PACKETOUT;
 152                 goto err2;
 153         }
 154         ret = -E_VORBIS;
 155         if (vorbis_synthesis_headerin(&vi, &vc, &packet) < 0)
 156                 goto err2;
 157         PARA_DEBUG_LOG("channels: %i, rate: %li\n", vi.channels, vi.rate);
 158         ogg_stream_packetin(stream_out, &packet);
 159
 160         ret = ogg_sync_pageout(sync_in, &page);
 161         if (ret <= 0) {
 162                 ret = -E_SYNC_PAGEOUT;
 163                 goto err2;
 164         }
 165         ogg_stream_pagein(stream_in, &page);
 166         ogg_stream_packetout(stream_in, &packet);
 167         ogg_stream_packetin(stream_out, &packet);
 168
 169         ret = ogg_sync_pageout(sync_in, &page);
 170         if (ret <= 0) {
 171                 ret = -E_SYNC_PAGEOUT;
 172                 goto err2;
 173         }
 174         ogg_stream_pagein(stream_in, &page);
 175         ogg_stream_packetout(stream_in, &packet);
 176         ogg_stream_packetin(stream_out, &packet);
 177
 178         afi->header_len = 0;
 179         while (ogg_stream_flush(stream_out, &page))
 180                 afi->header_len += page.body_len + page.header_len;
 181         PARA_DEBUG_LOG("header_len = %d\n", afi->header_len);
 182         afi->header_offset = 0;
 183         ret = 1;
 184 err2:
 185         ogg_stream_destroy(stream_in);
 186         ogg_stream_destroy(stream_out);
 187 err1:
 188         ogg_sync_destroy(sync_in);
 189         vorbis_info_clear(&vi);
 190         vorbis_comment_clear(&vc);
 191         return ret;
 192 }
 193
 194 /*
 195  * Alloc and fill array table of byte offsets. chunk_table[i] is the
 196  * offset in the current input file at which the sample containing time i *
 197  * CHUNK_TIME begins. Always successful.
 198  */
 199 static long unsigned ogg_compute_chunk_table(OggVorbis_File *of,
 200         struct audio_format_info *afi, long unsigned time_total)
 201 {
 202         int i, ret, num;
 203         ssize_t max_chunk_len, pos = 0, min = 0, old_pos;
 204         long unsigned num_chunks;
 205
 206         old_pos = 0;
 207         ret = 0;
 208         num = time_total / chunk_time + 3;
 209         PARA_DEBUG_LOG("chunk time: %g allocating %d chunk pointers\n",
 210                 chunk_time, num);
 211         afi->chunk_table = para_malloc((num + 1) * sizeof(size_t));
 212         afi->chunk_table[0] = 0;
 213         max_chunk_len = 0;
 214         for (i = 1; ret <= num; i++) {
 215                 ogg_int64_t diff;
 216                 ret = ov_time_seek(of, i * chunk_time);
 217                 if (ret)
 218                         break;
 219                 pos = ov_raw_tell(of);
 220                 diff = pos - old_pos;
 221                 max_chunk_len = PARA_MAX(max_chunk_len, diff);
 222                 min = (i == 1)? diff : PARA_MIN(min, diff);
 223                 afi->chunk_table[i] = pos;
 224 //              if (i < 11 || !((i - 1) % 1000)|| i > num - 11)
 225 //                      PARA_DEBUG_LOG("chunk #%d: %g secs, pos: %zd, "
 226 //                              "size: %zd\n", i - 1,
 227 //                              i * chunk_time, pos, pos - old_pos);
 228                 old_pos = pos;
 229         }
 230         num_chunks = i - 1;
 231 //fi->chunk_table[i] = pos;
 232         PARA_DEBUG_LOG("%lu chunks (%fs), max chunk: %zd, min chunk: %zd\n",
 233                 num_chunks, chunk_time, max_chunk_len, min);
 234         return num_chunks;
 235 }
 236
 237 /*
 238  * Init oggvorbis file and write some tech data to given pointers.
 239  */
 240 static int ogg_get_file_info(char *map, size_t numbytes,
 241                 struct audio_format_info *afi)
 242 {
 243         int ret;
 244         vorbis_info *vi;
 245         OggVorbis_File of;
 246         const ov_callbacks ovc = {
 247                 .read_func = cb_read,
 248                 .seek_func = cb_seek,
 249                 .close_func = cb_close,
 250                 .tell_func = cb_tell
 251         };
 252         struct ogg_datasource ods = {.map = map, .numbytes = numbytes, .fpos = 0};
 253
 254         ret = ogg_compute_header_len(map, numbytes, afi);
 255         if (ret < 0)
 256                 return ret;
 257         ret = ogg_open_callbacks(&ods, &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         afi->seconds_total = ov_time_total(&of, -1);
 265         afi->frequency = vi->rate;
 266         afi->bitrate = ov_bitrate(&of, 0);
 267         afi->channels = vi->channels;
 268         afi->chunks_total = ogg_compute_chunk_table(&of, afi, afi->seconds_total);
 269         sprintf(afi->info_string, "audio_file_info1:%lu x %lu, %ukHz, "
 270                 "%d channels, %ukbps\n"
 271                 "audio_file_info2: \n"
 272                 "audio_file_info3: \n",
 273                 afi->chunks_total, (long unsigned) (chunk_time * 1000 * 1000),
 274                 afi->frequency / 1000, vi->channels, afi->bitrate / 1000
 275                 );
 276         afi->chunk_tv.tv_sec = 0;
 277         afi->chunk_tv.tv_usec = 250 * 1000;
 278         tv_scale(3, &afi->chunk_tv, &afi->eof_tv);
 279         ret = 1;
 280 err:
 281         ov_clear(&of); /* keeps the file open */
 282         return ret;
 283 }
 284
 285 static const char* ogg_suffixes[] = {"ogg", NULL};
 286
 287 /**
 288  * the init function of the ogg vorbis audio format handler
 289  *
 290  * \param afh pointer to the struct to initialize
 291  */
 292 void ogg_init(struct audio_format_handler *afh)
 293 {
 294         afh->get_file_info = ogg_get_file_info,
 295         afh->suffixes = ogg_suffixes;
 296 }