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1 /***
2   This file is part of PulseAudio.
3 
4   Copyright 2006 Lennart Poettering
5 
6   PulseAudio is free software; you can redistribute it and/or modify
7   it under the terms of the GNU Lesser General Public License as published
8   by the Free Software Foundation; either version 2.1 of the License,
9   or (at your option) any later version.
10 
11   PulseAudio is distributed in the hope that it will be useful, but
12   WITHOUT ANY WARRANTY; without even the implied warranty of
13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14   General Public License for more details.
15 
16   You should have received a copy of the GNU Lesser General Public License
17   along with PulseAudio; if not, see <http://www.gnu.org/licenses/>.
18 ***/
19 
20 #ifdef HAVE_CONFIG_H
21 #include <config.h>
22 #endif
23 
24 #include "rtp.h"
25 
26 #include <pulsecore/core-util.h>
27 
pa_rtp_payload_from_sample_spec(const pa_sample_spec * ss)28 uint8_t pa_rtp_payload_from_sample_spec(const pa_sample_spec *ss) {
29     pa_assert(ss);
30 
31     if (ss->format == PA_SAMPLE_S16BE && ss->rate == 44100 && ss->channels == 2)
32         return 10;
33     if (ss->format == PA_SAMPLE_S16BE && ss->rate == 44100 && ss->channels == 1)
34         return 11;
35 
36     return 127;
37 }
38 
pa_rtp_sample_spec_from_payload(uint8_t payload,pa_sample_spec * ss)39 pa_sample_spec *pa_rtp_sample_spec_from_payload(uint8_t payload, pa_sample_spec *ss) {
40     pa_assert(ss);
41 
42     switch (payload) {
43         case 10:
44             ss->channels = 2;
45             ss->format = PA_SAMPLE_S16BE;
46             ss->rate = 44100;
47             break;
48 
49         case 11:
50             ss->channels = 1;
51             ss->format = PA_SAMPLE_S16BE;
52             ss->rate = 44100;
53             break;
54 
55         case 127:
56             ss->channels = 2;
57             ss->format = PA_SAMPLE_S16LE;
58             ss->rate = 48000;
59             break;
60 
61         default:
62             return NULL;
63     }
64 
65     return ss;
66 }
67 
pa_rtp_sample_spec_fixup(pa_sample_spec * ss,bool enable_opus)68 pa_sample_spec *pa_rtp_sample_spec_fixup(pa_sample_spec * ss, bool enable_opus) {
69     pa_assert(ss);
70 
71     if (!pa_rtp_sample_spec_valid(ss) && enable_opus)
72         ss->format = PA_SAMPLE_S16LE;
73     else if (!pa_rtp_sample_spec_valid(ss) || !enable_opus)
74         ss->format = PA_SAMPLE_S16BE;
75 
76     pa_assert(pa_rtp_sample_spec_valid(ss));
77     return ss;
78 }
79 
pa_rtp_sample_spec_valid(const pa_sample_spec * ss)80 int pa_rtp_sample_spec_valid(const pa_sample_spec *ss) {
81     pa_assert(ss);
82 
83     if (!pa_sample_spec_valid(ss))
84         return 0;
85 
86     return ss->format == PA_SAMPLE_S16BE || ss->format == PA_SAMPLE_S16LE;
87 }
88 
pa_rtp_format_to_string(pa_sample_format_t f)89 const char* pa_rtp_format_to_string(pa_sample_format_t f) {
90     switch (f) {
91         case PA_SAMPLE_S16BE:
92         case PA_SAMPLE_S16LE:
93             return "L16";
94         default:
95             return NULL;
96     }
97 }
98 
pa_rtp_string_to_format(const char * s,bool enable_opus)99 pa_sample_format_t pa_rtp_string_to_format(const char *s, bool enable_opus) {
100     pa_assert(s);
101 
102     if (pa_streq(s, "L16") && enable_opus)
103         return PA_SAMPLE_S16LE;
104     else if (pa_streq(s, "L16"))
105         return PA_SAMPLE_S16BE;
106     else
107         return PA_SAMPLE_INVALID;
108 }
109