1/*
2 * Copyright (C) 2017 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
23 * THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#pragma once
27
28#include <wtf/Variant.h>
29
30typedef struct AudioStreamBasicDescription AudioStreamBasicDescription;
31
32namespace WebCore {
33
34struct PlatformDescription {
35 enum {
36 None,
37 CAAudioStreamBasicType,
38 GStreamerAudioStreamDescription,
39 } type;
40 Variant<std::nullptr_t, const AudioStreamBasicDescription*> description;
41};
42
43class AudioStreamDescription {
44public:
45 virtual ~AudioStreamDescription() = default;
46
47 virtual const PlatformDescription& platformDescription() const = 0;
48
49 enum PCMFormat {
50 None,
51 Int16,
52 Int32,
53 Float32,
54 Float64
55 };
56 virtual PCMFormat format() const = 0;
57
58 virtual double sampleRate() const = 0;
59
60 virtual bool isPCM() const { return format() != None; }
61 virtual bool isInterleaved() const = 0;
62 virtual bool isSignedInteger() const = 0;
63 virtual bool isFloat() const = 0;
64 virtual bool isNativeEndian() const = 0;
65
66 virtual uint32_t numberOfInterleavedChannels() const = 0;
67 virtual uint32_t numberOfChannelStreams() const = 0;
68 virtual uint32_t numberOfChannels() const = 0;
69 virtual uint32_t sampleWordSize() const = 0;
70};
71
72}
73