summaryrefslogtreecommitdiffstats
path: root/src/audio_core/stream.cpp
blob: 8ab5649df4bdd8f639f89eda64659aa3f488e9f0 (plain) (blame)
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
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
// Copyright 2018 yuzu Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.

#include <algorithm>
#include <cmath>

#include "audio_core/sink.h"
#include "audio_core/sink_details.h"
#include "audio_core/sink_stream.h"
#include "audio_core/stream.h"
#include "common/assert.h"
#include "common/logging/log.h"
#include "core/core_timing.h"
#include "core/core_timing_util.h"
#include "core/settings.h"

namespace AudioCore {

constexpr std::size_t MaxAudioBufferCount{32};

u32 Stream::GetNumChannels() const {
    switch (format) {
    case Format::Mono16:
        return 1;
    case Format::Stereo16:
        return 2;
    case Format::Multi51Channel16:
        return 6;
    }
    UNIMPLEMENTED_MSG("Unimplemented format={}", static_cast<u32>(format));
    return {};
}

Stream::Stream(u32 sample_rate, Format format, ReleaseCallback&& release_callback,
               SinkStream& sink_stream, std::string&& name_)
    : sample_rate{sample_rate}, format{format}, release_callback{std::move(release_callback)},
      sink_stream{sink_stream}, name{std::move(name_)} {

    release_event = Core::Timing::RegisterEvent(
        name, [this](u64 userdata, int cycles_late) { ReleaseActiveBuffer(); });
}

void Stream::Play() {
    state = State::Playing;
    PlayNextBuffer();
}

void Stream::Stop() {
    state = State::Stopped;
    UNIMPLEMENTED();
}

Stream::State Stream::GetState() const {
    return state;
}

s64 Stream::GetBufferReleaseCycles(const Buffer& buffer) const {
    const std::size_t num_samples{buffer.GetSamples().size() / GetNumChannels()};
    return Core::Timing::usToCycles((static_cast<u64>(num_samples) * 1000000) / sample_rate);
}

static void VolumeAdjustSamples(std::vector<s16>& samples) {
    const float volume{std::clamp(Settings::values.volume, 0.0f, 1.0f)};

    if (volume == 1.0f) {
        return;
    }

    // Implementation of a volume slider with a dynamic range of 60 dB
    const float volume_scale_factor = volume == 0 ? 0 : std::exp(6.90775f * volume) * 0.001f;
    for (auto& sample : samples) {
        sample = static_cast<s16>(sample * volume_scale_factor);
    }
}

void Stream::PlayNextBuffer() {
    if (!IsPlaying()) {
        // Ensure we are in playing state before playing the next buffer
        sink_stream.Flush();
        return;
    }

    if (active_buffer) {
        // Do not queue a new buffer if we are already playing a buffer
        return;
    }

    if (queued_buffers.empty()) {
        // No queued buffers - we are effectively paused
        sink_stream.Flush();
        return;
    }

    active_buffer = queued_buffers.front();
    queued_buffers.pop();

    VolumeAdjustSamples(active_buffer->Samples());

    sink_stream.EnqueueSamples(GetNumChannels(), active_buffer->GetSamples());

    Core::Timing::ScheduleEventThreadsafe(GetBufferReleaseCycles(*active_buffer), release_event,
                                          {});
}

void Stream::ReleaseActiveBuffer() {
    ASSERT(active_buffer);
    released_buffers.push(std::move(active_buffer));
    release_callback();
    PlayNextBuffer();
}

bool Stream::QueueBuffer(BufferPtr&& buffer) {
    if (queued_buffers.size() < MaxAudioBufferCount) {
        queued_buffers.push(std::move(buffer));
        PlayNextBuffer();
        return true;
    }
    return false;
}

bool Stream::ContainsBuffer(Buffer::Tag tag) const {
    UNIMPLEMENTED();
    return {};
}

std::vector<Buffer::Tag> Stream::GetTagsAndReleaseBuffers(std::size_t max_count) {
    std::vector<Buffer::Tag> tags;
    for (std::size_t count = 0; count < max_count && !released_buffers.empty(); ++count) {
        tags.push_back(released_buffers.front()->GetTag());
        released_buffers.pop();
    }
    return tags;
}

} // namespace AudioCore