blob: 2afc07857366cf0494a252afb6b67ae955cdbf8e (
plain)
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
|
/*
* Copyright (c) 2018-2022, the SerenityOS developers.
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/FixedArray.h>
#include <AK/NonnullOwnPtr.h>
#include <AK/NonnullRefPtr.h>
#include <AK/RefCounted.h>
#include <AK/RefPtr.h>
#include <AK/Result.h>
#include <AK/Span.h>
#include <AK/StringView.h>
#include <AK/Try.h>
#include <LibAudio/GenericTypes.h>
#include <LibAudio/LoaderError.h>
#include <LibAudio/Sample.h>
#include <LibAudio/SampleFormats.h>
#include <LibCore/Stream.h>
namespace Audio {
static constexpr StringView no_plugin_error = "No loader plugin available"sv;
using LoaderSamples = Result<FixedArray<Sample>, LoaderError>;
using MaybeLoaderError = Result<void, LoaderError>;
class LoaderPlugin {
public:
explicit LoaderPlugin(StringView path);
explicit LoaderPlugin(Bytes buffer);
virtual ~LoaderPlugin() = default;
virtual MaybeLoaderError initialize() = 0;
virtual LoaderSamples get_more_samples(size_t max_bytes_to_read_from_input = 128 * KiB) = 0;
virtual MaybeLoaderError reset() = 0;
virtual MaybeLoaderError seek(int const sample_index) = 0;
// total_samples() and loaded_samples() should be independent
// of the number of channels.
//
// For example, with a three-second-long, stereo, 44.1KHz audio file:
// num_channels() should return 2
// sample_rate() should return 44100 (each channel is sampled at this rate)
// total_samples() should return 132300 (sample_rate * three seconds)
virtual int loaded_samples() = 0;
virtual int total_samples() = 0;
virtual u32 sample_rate() = 0;
virtual u16 num_channels() = 0;
// Human-readable name of the file format, of the form <full abbreviation> (.<ending>)
virtual String format_name() = 0;
virtual PcmSampleFormat pcm_format() = 0;
Vector<PictureData> const& pictures() const { return m_pictures; };
protected:
StringView m_path;
OwnPtr<Core::Stream::SeekableStream> m_stream;
// The constructor might set this so that we can initialize the data stream later.
Optional<Bytes> m_backing_memory;
Vector<PictureData> m_pictures;
};
class Loader : public RefCounted<Loader> {
public:
static Result<NonnullRefPtr<Loader>, LoaderError> create(StringView path) { return adopt_ref(*new Loader(TRY(try_create(path)))); }
static Result<NonnullRefPtr<Loader>, LoaderError> create(Bytes buffer) { return adopt_ref(*new Loader(TRY(try_create(buffer)))); }
LoaderSamples get_more_samples(size_t max_samples_to_read_from_input = 128 * KiB) const { return m_plugin->get_more_samples(max_samples_to_read_from_input); }
MaybeLoaderError reset() const { return m_plugin->reset(); }
MaybeLoaderError seek(int const position) const { return m_plugin->seek(position); }
int loaded_samples() const { return m_plugin->loaded_samples(); }
int total_samples() const { return m_plugin->total_samples(); }
u32 sample_rate() const { return m_plugin->sample_rate(); }
u16 num_channels() const { return m_plugin->num_channels(); }
String format_name() const { return m_plugin->format_name(); }
u16 bits_per_sample() const { return pcm_bits_per_sample(m_plugin->pcm_format()); }
Vector<PictureData> const& pictures() const { return m_plugin->pictures(); };
private:
static Result<NonnullOwnPtr<LoaderPlugin>, LoaderError> try_create(StringView path);
static Result<NonnullOwnPtr<LoaderPlugin>, LoaderError> try_create(Bytes buffer);
explicit Loader(NonnullOwnPtr<LoaderPlugin>);
mutable NonnullOwnPtr<LoaderPlugin> m_plugin;
};
}
|
