-
Notifications
You must be signed in to change notification settings - Fork 0
/
README
108 lines (76 loc) · 2.93 KB
/
README
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
MAST - Multicast Audio Streaming Toolkit
========================================
Nicholas J. Humfrey <njh@aelius.com>
For the latest information on MAST, please see:
http://www.aelius.com/njh/mast/[]
What is MAST ?
--------------
MAST is an audio streaming broadcaster and client using RTP over
IPv4 and IPv6 Multicast/Unicast.
Unlike VAT and RAT, which are designed primerily for audio conferencing, MAST
is designed to be used for audio distribution and broadcast. It is currently limited
to recieving a single audio source, unlike RAT which can mix serveral sources.
It supports many of the audio payload types in the Audio-visual Profile (RTP/AVP).
MAST is licenced under the GNU General Public License, see the file COPYING for details.
Tools in MAST
-------------
mast_info Display information about first RTP packet received
mast_cast Live Audio broadcaster that sources audio from JACK
mast_filecast Audio file broadcaster
mast_record Record/archive audio stream to audio file
mast_rawcast Directly broadcast a previously encoded audio file
mast_rawrecord Record/archive raw streams directly to disk
Supported Payloads
------------------
0 8000Hz Mono u-law encoded
3 8000Hz Mono GSM
7 8000Hz Mono LPC
8 8000Hz Mono A-law encoded
10 44.1kHz Stereo Raw 16-bit linear audio
11 44.1kHz Mono Raw 16-bit linear audio
14 - - MPEG Audio (encoder only)
Details are here:
http://www.iana.org/assignments/rtp-parameters[]
Current Limitations
-------------------
- No mixer support (can only recieve single source).
- No sample rate conversion support.
- No upmixing/downmixing support.
- No clock skew error correction.
- mast_rawcast currently only supports GSM and MPEG Audio.
- due to problems with oRTP, only 8000Hz streams can be recieved.
Test Stream
-----------
You can listen to a test stream coming from Unversity of Southampton:
----------------------------------------------------------
njh@dobbie:~$ mast_info ff7e:0440:2001:0630:00d0:f001:9000:7e57
Receive address: ff7e:0440:2001:0630:00d0:f001:9000:7e57/5004
RTP Header
==========
Payload type : 14
Payload size : 526 bytes
Sequence Number : 60390
Timestamp : 3219875130
SSRC Identifier : beef7e57
Marker Bit : Not Set
Payload Details
===============
Mime Type : audio/mpa
Clock Rate : 90000 Hz
MPEG Audio Header
=================
MPEG Version : MPEG-1 (Layer 2)
Mode : Stereo
Bitrate : 160 kbps
Sample Rate : 44100 Hz
Error Protection : No
Padding : No
Extension Bit : No
Copyright : No
Original : Yes
Samples per frame : 1152
Bytes per frame : 522
----------------------------------------------------------
Please email me if you have any problems listening.
Please note that you *must* be connected to m6bone in
order to receive IPv6 multicast (http://www.m6bone.net/[])