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