DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Mercurial (777e60ca8853)

VCS Links

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345
/* Copyright (c) 2011 Xiph.Org Foundation
   Written by Jean-Marc Valin */
/*
   Redistribution and use in source and binary forms, with or without
   modification, are permitted provided that the following conditions
   are met:

   - Redistributions of source code must retain the above copyright
   notice, this list of conditions and the following disclaimer.

   - Redistributions in binary form must reproduce the above copyright
   notice, this list of conditions and the following disclaimer in the
   documentation and/or other materials provided with the distribution.

   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
   OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
   EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
   PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
   PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
   LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
   SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "opus.h"
#include "opus_private.h"
#include "os_support.h"


int opus_repacketizer_get_size(void)
{
   return sizeof(OpusRepacketizer);
}

OpusRepacketizer *opus_repacketizer_init(OpusRepacketizer *rp)
{
   rp->nb_frames = 0;
   return rp;
}

OpusRepacketizer *opus_repacketizer_create(void)
{
   OpusRepacketizer *rp;
   rp=(OpusRepacketizer *)opus_alloc(opus_repacketizer_get_size());
   if(rp==NULL)return NULL;
   return opus_repacketizer_init(rp);
}

void opus_repacketizer_destroy(OpusRepacketizer *rp)
{
   opus_free(rp);
}

static int opus_repacketizer_cat_impl(OpusRepacketizer *rp, const unsigned char *data, opus_int32 len, int self_delimited)
{
   unsigned char tmp_toc;
   int curr_nb_frames,ret;
   /* Set of check ToC */
   if (len<1) return OPUS_INVALID_PACKET;
   if (rp->nb_frames == 0)
   {
      rp->toc = data[0];
      rp->framesize = opus_packet_get_samples_per_frame(data, 8000);
   } else if ((rp->toc&0xFC) != (data[0]&0xFC))
   {
      /*fprintf(stderr, "toc mismatch: 0x%x vs 0x%x\n", rp->toc, data[0]);*/
      return OPUS_INVALID_PACKET;
   }
   curr_nb_frames = opus_packet_get_nb_frames(data, len);
   if(curr_nb_frames<1) return OPUS_INVALID_PACKET;

   /* Check the 120 ms maximum packet size */
   if ((curr_nb_frames+rp->nb_frames)*rp->framesize > 960)
   {
      return OPUS_INVALID_PACKET;
   }

   ret=opus_packet_parse_impl(data, len, self_delimited, &tmp_toc, &rp->frames[rp->nb_frames], &rp->len[rp->nb_frames], NULL, NULL);
   if(ret<1)return ret;

   rp->nb_frames += curr_nb_frames;
   return OPUS_OK;
}

int opus_repacketizer_cat(OpusRepacketizer *rp, const unsigned char *data, opus_int32 len)
{
   return opus_repacketizer_cat_impl(rp, data, len, 0);
}

int opus_repacketizer_get_nb_frames(OpusRepacketizer *rp)
{
   return rp->nb_frames;
}

opus_int32 opus_repacketizer_out_range_impl(OpusRepacketizer *rp, int begin, int end,
      unsigned char *data, opus_int32 maxlen, int self_delimited, int pad)
{
   int i, count;
   opus_int32 tot_size;
   opus_int16 *len;
   const unsigned char **frames;
   unsigned char * ptr;

   if (begin<0 || begin>=end || end>rp->nb_frames)
   {
      /*fprintf(stderr, "%d %d %d\n", begin, end, rp->nb_frames);*/
      return OPUS_BAD_ARG;
   }
   count = end-begin;

   len = rp->len+begin;
   frames = rp->frames+begin;
   if (self_delimited)
      tot_size = 1 + (len[count-1]>=252);
   else
      tot_size = 0;

   ptr = data;
   if (count==1)
   {
      /* Code 0 */
      tot_size += len[0]+1;
      if (tot_size > maxlen)
         return OPUS_BUFFER_TOO_SMALL;
      *ptr++ = rp->toc&0xFC;
   } else if (count==2)
   {
      if (len[1] == len[0])
      {
         /* Code 1 */
         tot_size += 2*len[0]+1;
         if (tot_size > maxlen)
            return OPUS_BUFFER_TOO_SMALL;
         *ptr++ = (rp->toc&0xFC) | 0x1;
      } else {
         /* Code 2 */
         tot_size += len[0]+len[1]+2+(len[0]>=252);
         if (tot_size > maxlen)
            return OPUS_BUFFER_TOO_SMALL;
         *ptr++ = (rp->toc&0xFC) | 0x2;
         ptr += encode_size(len[0], ptr);
      }
   }
   if (count > 2 || (pad && tot_size < maxlen))
   {
      /* Code 3 */
      int vbr;
      int pad_amount=0;

      /* Restart the process for the padding case */
      ptr = data;
      if (self_delimited)
         tot_size = 1 + (len[count-1]>=252);
      else
         tot_size = 0;
      vbr = 0;
      for (i=1;i<count;i++)
      {
         if (len[i] != len[0])
         {
            vbr=1;
            break;
         }
      }
      if (vbr)
      {
         tot_size += 2;
         for (i=0;i<count-1;i++)
            tot_size += 1 + (len[i]>=252) + len[i];
         tot_size += len[count-1];

         if (tot_size > maxlen)
            return OPUS_BUFFER_TOO_SMALL;
         *ptr++ = (rp->toc&0xFC) | 0x3;
         *ptr++ = count | 0x80;
      } else {
         tot_size += count*len[0]+2;
         if (tot_size > maxlen)
            return OPUS_BUFFER_TOO_SMALL;
         *ptr++ = (rp->toc&0xFC) | 0x3;
         *ptr++ = count;
      }
      pad_amount = pad ? (maxlen-tot_size) : 0;
      if (pad_amount != 0)
      {
         int nb_255s;
         data[1] |= 0x40;
         nb_255s = (pad_amount-1)/255;
         for (i=0;i<nb_255s;i++)
            *ptr++ = 255;
         *ptr++ = pad_amount-255*nb_255s-1;
         tot_size += pad_amount;
      }
      if (vbr)
      {
         for (i=0;i<count-1;i++)
            ptr += encode_size(len[i], ptr);
      }
   }
   if (self_delimited) {
      int sdlen = encode_size(len[count-1], ptr);
      ptr += sdlen;
   }
   /* Copy the actual data */
   for (i=0;i<count;i++)
   {
      /* Using OPUS_MOVE() instead of OPUS_COPY() in case we're doing in-place
         padding from opus_packet_pad or opus_packet_unpad(). */
      celt_assert(frames[i] + len[i] <= data || ptr <= frames[i]);
      OPUS_MOVE(ptr, frames[i], len[i]);
      ptr += len[i];
   }
   if (pad)
   {
      for (i=ptr-data;i<maxlen;i++)
         data[i] = 0;
   }
   return tot_size;
}

opus_int32 opus_repacketizer_out_range(OpusRepacketizer *rp, int begin, int end, unsigned char *data, opus_int32 maxlen)
{
   return opus_repacketizer_out_range_impl(rp, begin, end, data, maxlen, 0, 0);
}

opus_int32 opus_repacketizer_out(OpusRepacketizer *rp, unsigned char *data, opus_int32 maxlen)
{
   return opus_repacketizer_out_range_impl(rp, 0, rp->nb_frames, data, maxlen, 0, 0);
}

int opus_packet_pad(unsigned char *data, opus_int32 len, opus_int32 new_len)
{
   OpusRepacketizer rp;
   opus_int32 ret;
   if (len < 1)
      return OPUS_BAD_ARG;
   if (len==new_len)
      return OPUS_OK;
   else if (len > new_len)
      return OPUS_BAD_ARG;
   opus_repacketizer_init(&rp);
   /* Moving payload to the end of the packet so we can do in-place padding */
   OPUS_MOVE(data+new_len-len, data, len);
   opus_repacketizer_cat(&rp, data+new_len-len, len);
   ret = opus_repacketizer_out_range_impl(&rp, 0, rp.nb_frames, data, new_len, 0, 1);
   if (ret > 0)
      return OPUS_OK;
   else
      return ret;
}

opus_int32 opus_packet_unpad(unsigned char *data, opus_int32 len)
{
   OpusRepacketizer rp;
   opus_int32 ret;
   if (len < 1)
      return OPUS_BAD_ARG;
   opus_repacketizer_init(&rp);
   ret = opus_repacketizer_cat(&rp, data, len);
   if (ret < 0)
      return ret;
   ret = opus_repacketizer_out_range_impl(&rp, 0, rp.nb_frames, data, len, 0, 0);
   celt_assert(ret > 0 && ret <= len);
   return ret;
}

int opus_multistream_packet_pad(unsigned char *data, opus_int32 len, opus_int32 new_len, int nb_streams)
{
   int s;
   int count;
   unsigned char toc;
   opus_int16 size[48];
   opus_int32 packet_offset;
   opus_int32 amount;

   if (len < 1)
      return OPUS_BAD_ARG;
   if (len==new_len)
      return OPUS_OK;
   else if (len > new_len)
      return OPUS_BAD_ARG;
   amount = new_len - len;
   /* Seek to last stream */
   for (s=0;s<nb_streams-1;s++)
   {
      if (len<=0)
         return OPUS_INVALID_PACKET;
      count = opus_packet_parse_impl(data, len, 1, &toc, NULL,
                                     size, NULL, &packet_offset);
      if (count<0)
         return count;
      data += packet_offset;
      len -= packet_offset;
   }
   return opus_packet_pad(data, len, len+amount);
}

opus_int32 opus_multistream_packet_unpad(unsigned char *data, opus_int32 len, int nb_streams)
{
   int s;
   unsigned char toc;
   opus_int16 size[48];
   opus_int32 packet_offset;
   OpusRepacketizer rp;
   unsigned char *dst;
   opus_int32 dst_len;

   if (len < 1)
      return OPUS_BAD_ARG;
   dst = data;
   dst_len = 0;
   /* Unpad all frames */
   for (s=0;s<nb_streams;s++)
   {
      opus_int32 ret;
      int self_delimited = s!=nb_streams-1;
      if (len<=0)
         return OPUS_INVALID_PACKET;
      opus_repacketizer_init(&rp);
      ret = opus_packet_parse_impl(data, len, self_delimited, &toc, NULL,
                                     size, NULL, &packet_offset);
      if (ret<0)
         return ret;
      ret = opus_repacketizer_cat_impl(&rp, data, packet_offset, self_delimited);
      if (ret < 0)
         return ret;
      ret = opus_repacketizer_out_range_impl(&rp, 0, rp.nb_frames, dst, len, self_delimited, 0);
      if (ret < 0)
         return ret;
      else
         dst_len += ret;
      dst += ret;
      data += packet_offset;
      len -= packet_offset;
   }
   return dst_len;
}