1 /*
2 * encoder-lpc.cc --
3 *
4 * FIXME: This file needs a description here.
5 *
6 * Copyright (c) 1995-2002 The Regents of the University of California.
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions are met:
11 *
12 * A. Redistributions of source code must retain the above copyright notice,
13 * this list of conditions and the following disclaimer.
14 * B. Redistributions in binary form must reproduce the above copyright notice,
15 * this list of conditions and the following disclaimer in the documentation
16 * and/or other materials provided with the distribution.
17 * C. Neither the names of the copyright holders nor the names of its
18 * contributors may be used to endorse or promote products derived from this
19 * software without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS
22 * IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
23 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
24 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE
25 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
26 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
27 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
30 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
31 * POSSIBILITY OF SUCH DAMAGE.
32 */
33
34 static const char rcsid[] =
35 "@(#) $Header: /usr/mash/src/repository/mash/mash-1/audio/encoder-lpc.cc,v 1.9 2003/11/19 19:20:14 aswan Exp $";
36
37 #include "rtp/config.h"
38 #include "rtp/rtp.h"
39 #include "audio/encoder.h"
40 #include "rtp/pktbuf-rtp.h"
41 extern "C" {
42 #include "audio/lpc.h"
43 }
44
45 class LPCEncoder : public PCM_Encoder {
46 public:
47 LPCEncoder();
48 virtual void encode(u_int32_t ts, u_int8_t* samples, int cc);
49 };
50
51 static class LPCEncoderClass : public TclClass {
52 public:
53 LPCEncoderClass() : TclClass("Module/AudioEncoder/LPC") {}
54 TclObject* create(int /* argc */, const char*const* /* argv */) {
55 return (new LPCEncoder);
56 }
57 } lpc_encoder_class;
58
59
60 LPCEncoder::LPCEncoder()
61 {
62 /*FIXME*/
63 lpcstate_t dummy;
64 lpc_init(&dummy);
65 }
66
67 void LPCEncoder::encode(u_int32_t ts, u_int8_t* frame, int len)
68 {
69 register int marker = (ts != last_ts_) ? htons(RTP_M) : 0;
70 last_ts_ = ts + len;
71
72 pktbuf* pb = pool_->alloc(ts, RTP_PT_LPC);
73 rtphdr* rh = (rtphdr*)pb->data;
74 rh->rh_flags |= marker;
75 u_int8_t* o = (u_int8_t*)(rh + 1);
76 int outlen = 0;
77 while (len > 0) {
78 lpcparams_t* p = (lpcparams_t*)o;
79 lpc_analyze(frame, p);
80 HTONS(p->period);
81 o += LPCRECSIZE;
82 outlen += LPCRECSIZE;
83 len -= AUDIO_FRAMESIZE;
84 frame += AUDIO_FRAMESIZE;
85 }
86 pb->len = outlen + sizeof(*rh);
87 target_->recv(pb);
88 }
89
This page was automatically generated by the
LXR engine.
Visit the LXR main site for more
information.