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                 goto err1;
 138         serial = ogg_page_serialno(&page);
 139         ogg_stream_init(stream_in, serial);
 140         ogg_stream_init(stream_out, serial);
 141         ret = ogg_stream_pagein(stream_in, &page);
 142         if (ret < 0) {
 143                 ret = -E_STREAM_PAGEIN;
 144                 goto err2;
 145         }
 146         ret = ogg_stream_packetout(stream_in, &packet);
 147         if (ret != 1) {
 148                 ret = -E_STREAM_PACKETOUT;
 149                 goto err2;
 150         }
 151         ret = -E_VORBIS;
 152         if (vorbis_synthesis_headerin(&vi, &vc, &packet) < 0)
 153                 goto err2;
 154         PARA_INFO_LOG("channels: %i, rate: %li\n", vi.channels, vi.rate);
 155         ogg_stream_packetin(stream_out, &packet);
 156
 157         ret = ogg_sync_pageout(sync_in, &page);
 158         if (ret <= 0) {
 159                 ret = -E_SYNC_PAGEOUT;
 160                 goto err2;
 161         }
 162         ogg_stream_pagein(stream_in, &page);
 163         ogg_stream_packetout(stream_in, &packet);
 164         ogg_stream_packetin(stream_out, &packet);
 165
 166         ret = ogg_sync_pageout(sync_in, &page);
 167         if (ret <= 0) {
 168                 ret = -E_SYNC_PAGEOUT;
 169                 goto err2;
 170         }
 171         ogg_stream_pagein(stream_in, &page);
 172         ogg_stream_packetout(stream_in, &packet);
 173         ogg_stream_packetin(stream_out, &packet);
 174
 175         afi->header_len = 0;
 176         while (ogg_stream_flush(stream_out, &page))
 177                 afi->header_len += page.body_len + page.header_len;
 178         PARA_INFO_LOG("header_len = %d\n", afi->header_len);
 179         afi->header_offset = 0;
 180         ret = 1;
 181 err2:
 182         ogg_stream_destroy(stream_in);
 183         ogg_stream_destroy(stream_out);
 184 err1:
 185         ogg_sync_destroy(sync_in);
 186         vorbis_info_clear(&vi);
 187         vorbis_comment_clear(&vc);
 188         return ret;
 189 }
 190
 191 /*
 192  * Alloc and fill array table of byte offsets. chunk_table[i] is the
 193  * offset in the current input file at which the sample containing time i *
 194  * CHUNK_TIME begins. Always successful.
 195  */
 196 static long unsigned ogg_compute_chunk_table(OggVorbis_File *of,
 197         struct audio_format_info *afi, long unsigned time_total)
 198 {
 199         int i, ret, num;
 200         ssize_t max_chunk_len, pos = 0, min = 0, old_pos;
 201         long unsigned num_chunks;
 202
 203         old_pos = 0;
 204         ret = 0;
 205         num = time_total / chunk_time + 3;
 206         PARA_DEBUG_LOG("chunk time: %g allocating %d chunk pointers\n",
 207                 chunk_time, num);
 208         afi->chunk_table = para_malloc((num + 1) * sizeof(size_t));
 209         afi->chunk_table[0] = 0;
 210         max_chunk_len = 0;
 211         for (i = 1; ret <= num; i++) {
 212                 ogg_int64_t diff;
 213                 ret = ov_time_seek(of, i * chunk_time);
 214                 if (ret)
 215                         break;
 216                 pos = ov_raw_tell(of);
 217                 diff = pos - old_pos;
 218                 max_chunk_len = PARA_MAX(max_chunk_len, diff);
 219                 min = (i == 1)? diff : PARA_MIN(min, diff);
 220                 afi->chunk_table[i] = pos;
 221 //              if (i < 11 || !((i - 1) % 1000)|| i > num - 11)
 222 //                      PARA_DEBUG_LOG("chunk #%d: %g secs, pos: %zd, "
 223 //                              "size: %zd\n", i - 1,
 224 //                              i * chunk_time, pos, pos - old_pos);
 225                 old_pos = pos;
 226         }
 227         num_chunks = i - 1;
 228 //fi->chunk_table[i] = pos;
 229         PARA_INFO_LOG("%lu chunks (%fs), max chunk: %zd, min chunk: %zd\n",
 230                 num_chunks, chunk_time, max_chunk_len, min);
 231         return num_chunks;
 232 }
 233
 234 /*
 235  * Init oggvorbis file and write some tech data to given pointers.
 236  */
 237 static int ogg_get_file_info(char *map, size_t numbytes,
 238                 struct audio_format_info *afi)
 239 {
 240         int ret;
 241         vorbis_info *vi;
 242         OggVorbis_File of;
 243         const ov_callbacks ovc = {
 244                 .read_func = cb_read,
 245                 .seek_func = cb_seek,
 246                 .close_func = cb_close,
 247                 .tell_func = cb_tell
 248         };
 249         struct ogg_datasource ods = {.map = map, .numbytes = numbytes, .fpos = 0};
 250
 251         ret = ogg_compute_header_len(map, numbytes, afi);
 252         if (ret < 0)
 253                 return ret;
 254         ret = ogg_open_callbacks(&ods, &of, ovc);
 255         if (ret < 0)
 256                 goto err;
 257         ret = -E_OGG_INFO;
 258         vi = ov_info(&of, 0);
 259         if (!vi)
 260                 goto err;
 261         afi->seconds_total = ov_time_total(&of, -1);
 262         afi->frequency = vi->rate;
 263         afi->bitrate = ov_bitrate(&of, 0);
 264         afi->channels = vi->channels;
 265         afi->chunks_total = ogg_compute_chunk_table(&of, afi, afi->seconds_total);
 266         sprintf(afi->info_string, "audio_file_info1:%lu x %lu, %ukHz, "
 267                 "%d channels, %ukbps\n"
 268                 "audio_file_info2: \n"
 269                 "audio_file_info3: \n",
 270                 afi->chunks_total, (long unsigned) (chunk_time * 1000 * 1000),
 271                 afi->frequency / 1000, vi->channels, afi->bitrate / 1000
 272                 );
 273         afi->chunk_tv.tv_sec = 0;
 274         afi->chunk_tv.tv_usec = 250 * 1000;
 275         tv_scale(3, &afi->chunk_tv, &afi->eof_tv);
 276         ret = 1;
 277 err:
 278         ov_clear(&of); /* keeps the file open */
 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 afh pointer to the struct to initialize
 288  */
 289 void ogg_init(struct audio_format_handler *afh)
 290 {
 291         afh->get_file_info = ogg_get_file_info,
 292         afh->suffixes = ogg_suffixes;
 293 }