346 lines
9.5 KiB
C
346 lines
9.5 KiB
C
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/* Copyright (c) 2011 Xiph.Org Foundation
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Written by Jean-Marc Valin */
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/*
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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- Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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- Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
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OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "opus.h"
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#include "opus_private.h"
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#include "os_support.h"
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int opus_repacketizer_get_size(void)
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{
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return sizeof(OpusRepacketizer);
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}
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OpusRepacketizer *opus_repacketizer_init(OpusRepacketizer *rp)
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{
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rp->nb_frames = 0;
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return rp;
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}
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OpusRepacketizer *opus_repacketizer_create(void)
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{
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OpusRepacketizer *rp;
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rp=(OpusRepacketizer *)opus_alloc(opus_repacketizer_get_size());
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if(rp==NULL)return NULL;
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return opus_repacketizer_init(rp);
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}
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void opus_repacketizer_destroy(OpusRepacketizer *rp)
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{
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opus_free(rp);
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}
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static int opus_repacketizer_cat_impl(OpusRepacketizer *rp, const unsigned char *data, opus_int32 len, int self_delimited)
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{
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unsigned char tmp_toc;
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int curr_nb_frames,ret;
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/* Set of check ToC */
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if (len<1) return OPUS_INVALID_PACKET;
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if (rp->nb_frames == 0)
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{
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rp->toc = data[0];
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rp->framesize = opus_packet_get_samples_per_frame(data, 8000);
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} else if ((rp->toc&0xFC) != (data[0]&0xFC))
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{
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/*fprintf(stderr, "toc mismatch: 0x%x vs 0x%x\n", rp->toc, data[0]);*/
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return OPUS_INVALID_PACKET;
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}
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curr_nb_frames = opus_packet_get_nb_frames(data, len);
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if(curr_nb_frames<1) return OPUS_INVALID_PACKET;
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/* Check the 120 ms maximum packet size */
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if ((curr_nb_frames+rp->nb_frames)*rp->framesize > 960)
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{
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return OPUS_INVALID_PACKET;
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}
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ret=opus_packet_parse_impl(data, len, self_delimited, &tmp_toc, &rp->frames[rp->nb_frames], &rp->len[rp->nb_frames], NULL, NULL);
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if(ret<1)return ret;
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rp->nb_frames += curr_nb_frames;
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return OPUS_OK;
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}
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int opus_repacketizer_cat(OpusRepacketizer *rp, const unsigned char *data, opus_int32 len)
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{
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return opus_repacketizer_cat_impl(rp, data, len, 0);
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}
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int opus_repacketizer_get_nb_frames(OpusRepacketizer *rp)
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{
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return rp->nb_frames;
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}
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opus_int32 opus_repacketizer_out_range_impl(OpusRepacketizer *rp, int begin, int end,
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unsigned char *data, opus_int32 maxlen, int self_delimited, int pad)
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{
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int i, count;
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opus_int32 tot_size;
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opus_int16 *len;
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const unsigned char **frames;
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unsigned char * ptr;
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if (begin<0 || begin>=end || end>rp->nb_frames)
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{
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/*fprintf(stderr, "%d %d %d\n", begin, end, rp->nb_frames);*/
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return OPUS_BAD_ARG;
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}
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count = end-begin;
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len = rp->len+begin;
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frames = rp->frames+begin;
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if (self_delimited)
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tot_size = 1 + (len[count-1]>=252);
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else
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tot_size = 0;
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ptr = data;
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if (count==1)
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{
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/* Code 0 */
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tot_size += len[0]+1;
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if (tot_size > maxlen)
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return OPUS_BUFFER_TOO_SMALL;
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*ptr++ = rp->toc&0xFC;
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} else if (count==2)
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{
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if (len[1] == len[0])
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{
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/* Code 1 */
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tot_size += 2*len[0]+1;
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if (tot_size > maxlen)
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return OPUS_BUFFER_TOO_SMALL;
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*ptr++ = (rp->toc&0xFC) | 0x1;
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} else {
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/* Code 2 */
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tot_size += len[0]+len[1]+2+(len[0]>=252);
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if (tot_size > maxlen)
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return OPUS_BUFFER_TOO_SMALL;
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*ptr++ = (rp->toc&0xFC) | 0x2;
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ptr += encode_size(len[0], ptr);
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}
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}
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if (count > 2 || (pad && tot_size < maxlen))
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{
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/* Code 3 */
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int vbr;
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int pad_amount=0;
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/* Restart the process for the padding case */
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ptr = data;
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if (self_delimited)
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tot_size = 1 + (len[count-1]>=252);
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else
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tot_size = 0;
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vbr = 0;
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for (i=1;i<count;i++)
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{
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if (len[i] != len[0])
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{
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vbr=1;
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break;
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}
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}
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if (vbr)
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{
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tot_size += 2;
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for (i=0;i<count-1;i++)
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tot_size += 1 + (len[i]>=252) + len[i];
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tot_size += len[count-1];
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if (tot_size > maxlen)
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return OPUS_BUFFER_TOO_SMALL;
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*ptr++ = (rp->toc&0xFC) | 0x3;
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*ptr++ = count | 0x80;
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} else {
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tot_size += count*len[0]+2;
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if (tot_size > maxlen)
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return OPUS_BUFFER_TOO_SMALL;
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*ptr++ = (rp->toc&0xFC) | 0x3;
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*ptr++ = count;
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}
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pad_amount = pad ? (maxlen-tot_size) : 0;
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if (pad_amount != 0)
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{
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int nb_255s;
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data[1] |= 0x40;
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nb_255s = (pad_amount-1)/255;
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for (i=0;i<nb_255s;i++)
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*ptr++ = 255;
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*ptr++ = pad_amount-255*nb_255s-1;
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tot_size += pad_amount;
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}
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if (vbr)
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{
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for (i=0;i<count-1;i++)
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ptr += encode_size(len[i], ptr);
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}
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}
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if (self_delimited) {
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int sdlen = encode_size(len[count-1], ptr);
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ptr += sdlen;
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}
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/* Copy the actual data */
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for (i=0;i<count;i++)
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{
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/* Using OPUS_MOVE() instead of OPUS_COPY() in case we're doing in-place
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padding from opus_packet_pad or opus_packet_unpad(). */
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celt_assert(frames[i] + len[i] <= data || ptr <= frames[i]);
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OPUS_MOVE(ptr, frames[i], len[i]);
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ptr += len[i];
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}
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if (pad)
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{
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for (i=ptr-data;i<maxlen;i++)
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data[i] = 0;
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}
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return tot_size;
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}
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opus_int32 opus_repacketizer_out_range(OpusRepacketizer *rp, int begin, int end, unsigned char *data, opus_int32 maxlen)
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{
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return opus_repacketizer_out_range_impl(rp, begin, end, data, maxlen, 0, 0);
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}
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opus_int32 opus_repacketizer_out(OpusRepacketizer *rp, unsigned char *data, opus_int32 maxlen)
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{
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return opus_repacketizer_out_range_impl(rp, 0, rp->nb_frames, data, maxlen, 0, 0);
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}
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int opus_packet_pad(unsigned char *data, opus_int32 len, opus_int32 new_len)
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{
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OpusRepacketizer rp;
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opus_int32 ret;
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if (len < 1)
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return OPUS_BAD_ARG;
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if (len==new_len)
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return OPUS_OK;
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else if (len > new_len)
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return OPUS_BAD_ARG;
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opus_repacketizer_init(&rp);
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/* Moving payload to the end of the packet so we can do in-place padding */
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OPUS_MOVE(data+new_len-len, data, len);
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opus_repacketizer_cat(&rp, data+new_len-len, len);
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ret = opus_repacketizer_out_range_impl(&rp, 0, rp.nb_frames, data, new_len, 0, 1);
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if (ret > 0)
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return OPUS_OK;
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else
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return ret;
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}
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opus_int32 opus_packet_unpad(unsigned char *data, opus_int32 len)
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{
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OpusRepacketizer rp;
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opus_int32 ret;
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if (len < 1)
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return OPUS_BAD_ARG;
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opus_repacketizer_init(&rp);
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ret = opus_repacketizer_cat(&rp, data, len);
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if (ret < 0)
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return ret;
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ret = opus_repacketizer_out_range_impl(&rp, 0, rp.nb_frames, data, len, 0, 0);
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celt_assert(ret > 0 && ret <= len);
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return ret;
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}
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int opus_multistream_packet_pad(unsigned char *data, opus_int32 len, opus_int32 new_len, int nb_streams)
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{
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int s;
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int count;
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unsigned char toc;
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opus_int16 size[48];
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opus_int32 packet_offset;
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opus_int32 amount;
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if (len < 1)
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return OPUS_BAD_ARG;
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if (len==new_len)
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return OPUS_OK;
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else if (len > new_len)
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return OPUS_BAD_ARG;
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amount = new_len - len;
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/* Seek to last stream */
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for (s=0;s<nb_streams-1;s++)
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{
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if (len<=0)
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return OPUS_INVALID_PACKET;
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count = opus_packet_parse_impl(data, len, 1, &toc, NULL,
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size, NULL, &packet_offset);
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if (count<0)
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return count;
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data += packet_offset;
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len -= packet_offset;
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}
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return opus_packet_pad(data, len, len+amount);
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}
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opus_int32 opus_multistream_packet_unpad(unsigned char *data, opus_int32 len, int nb_streams)
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{
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int s;
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unsigned char toc;
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opus_int16 size[48];
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opus_int32 packet_offset;
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OpusRepacketizer rp;
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unsigned char *dst;
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opus_int32 dst_len;
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if (len < 1)
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return OPUS_BAD_ARG;
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dst = data;
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dst_len = 0;
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/* Unpad all frames */
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for (s=0;s<nb_streams;s++)
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{
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opus_int32 ret;
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int self_delimited = s!=nb_streams-1;
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if (len<=0)
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return OPUS_INVALID_PACKET;
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opus_repacketizer_init(&rp);
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ret = opus_packet_parse_impl(data, len, self_delimited, &toc, NULL,
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size, NULL, &packet_offset);
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if (ret<0)
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return ret;
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ret = opus_repacketizer_cat_impl(&rp, data, packet_offset, self_delimited);
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if (ret < 0)
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return ret;
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ret = opus_repacketizer_out_range_impl(&rp, 0, rp.nb_frames, dst, len, self_delimited, 0);
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if (ret < 0)
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return ret;
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else
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dst_len += ret;
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dst += ret;
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data += packet_offset;
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len -= packet_offset;
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}
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return dst_len;
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}
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