1 /*
2 * encoder-mp3.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-mp3.cc,v 1.2 2002/02/03 03:10:46 lim Exp $ (LBL)";
36
37 #include "config.h"
38 #include "rtp.h"
39 #include "encoder.h"
40 #include "pktbuf-rtp.h"
41 extern "C" {
42 #include "../../lame/include/lame.h"
43 }
44
45 class MP3Encoder : public PCM_Encoder {
46 public:
47 MP3Encoder();
48 ~MP3Encoder();
49 lame_global_flags *gfp;
50 short int R_Buffer[1152];
51 unsigned char mp3buffer[16384];
52 u_int32_t mp3ts;
53 int bitrate, samplerate;
54 virtual void encode(u_int32_t ts, u_int8_t* samples, int cc);
55 };
56
57 static class MP3EncoderClass : public TclClass {
58 public:
59 MP3EncoderClass() : TclClass("Module/AudioEncoder/MP3") {}
60 TclObject* create(int /* argc */, const char*const* /* argv */) {
61 return (new MP3Encoder);
62 }
63 } mp3_encoder_class;
64
65
66 MP3Encoder::MP3Encoder()
67 {
68 gfp = lame_init();
69 Tcl& tcl = Tcl::instance();
70 tcl.evalf("[Application instance] get_option sampleRate");
71 samplerate = atoi(tcl.result());
72 tcl.evalf("[Application instance] get_option bitRate");
73 bitrate = atoi(tcl.result());
74 lame_set_num_channels(gfp,1);
75 lame_set_in_samplerate(gfp,samplerate);
76 lame_set_brate(gfp,bitrate);
77 lame_set_mode(gfp,MONO);
78 int ret_code = lame_init_params(gfp);
79 if (ret_code < 0)
80 fprintf(stderr, "error initializing lame encoder!\n");
81 lame_print_config(gfp);
82 bzero(R_Buffer, 2304); // 2 bytes/sample * 1152 samples
83 }
84
85 void MP3Encoder::encode(u_int32_t ts, u_int8_t* frame, int len)
86 {
87 int imp3;
88 int nsamp = len/2;
89
90 imp3 = lame_encode_buffer(gfp, (short int*)frame, R_Buffer, nsamp,
91 mp3buffer, 16384);
92
93 register int marker = (ts != last_ts_) ? htons(RTP_M) : 0;
94 last_ts_ = ts + len;
95
96 // should check that it is less than sizeof(pb->data)
97 if (imp3 <= 0)
98 return;
99
100 if (marker != 0)
101 mp3ts = ts;
102 else
103 mp3ts += 2304;
104
105 pktbuf* pb = pool_->alloc(mp3ts, RTP_PT_MP3);
106 rtphdr* rh = (rtphdr*)pb->data;
107 rh->rh_flags |= marker;
108 u_int8_t* o = (u_int8_t*)(rh + 1);
109
110 memcpy(o, mp3buffer, imp3);
111 pb->len = imp3 + sizeof(*rh);
112 target_->recv(pb);
113 }
114
115 MP3Encoder::~MP3Encoder()
116 {
117 lame_close(gfp);
118 }
119
This page was automatically generated by the
LXR engine.
Visit the LXR main site for more
information.