implement Milestone 13: audio output with volume limits and concurrent sound management
This commit is contained in:
@@ -606,8 +606,9 @@ TEST(MicrophoneInterface, ShowsIndicator);
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---
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## Milestone 13: Virtual Hardware - Audio Output
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## Milestone 13: Virtual Hardware - Audio Output ✅
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**Status**: Complete
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**Goal**: Safe audio playback.
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**Estimated Files**: 1 new file
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467
SANDBOX_MILESTONE_13.md
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467
SANDBOX_MILESTONE_13.md
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@@ -0,0 +1,467 @@
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# Milestone 13: Virtual Hardware - Audio Output
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**Status**: Complete
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**Goal**: Safe audio playback with volume limits and concurrent sound management.
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---
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## Overview
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This milestone implements secure audio output for Lua apps:
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- No special permission required (normal capability)
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- System volume limit (app cannot exceed system volume)
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- Concurrent sound limit (10 per app)
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- Automatic cleanup on app stop
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- Support for PCM and basic audio formats
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### Key Deliverables
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1. **AudioOutputInterface class** - Sound playback management
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2. **SoundPlayer class** - Individual sound instance
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3. **Lua audio API** - `audio.play()`, player methods
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4. **Volume enforcement** - System volume cap
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---
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## File Structure
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```
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src/main/cpp/sandbox/
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├── audio_output.h # NEW - Audio output API header
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└── audio_output.cpp # NEW - Audio output implementation
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```
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---
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## Implementation Details
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### 1. AudioOutputInterface Class
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```cpp
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// audio_output.h
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#pragma once
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#include <string>
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#include <memory>
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#include <functional>
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#include <mutex>
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#include <atomic>
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#include <vector>
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#include <unordered_map>
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struct lua_State;
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namespace mosis {
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enum class AudioState {
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Playing,
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Paused,
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Stopped
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};
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struct PlaybackConfig {
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float volume = 1.0f; // 0.0 to 1.0
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bool loop = false;
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float pitch = 1.0f; // 0.5 to 2.0
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float pan = 0.0f; // -1.0 (left) to 1.0 (right)
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};
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struct AudioData {
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std::vector<uint8_t> data;
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int sample_rate = 44100;
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int channels = 1;
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int bits_per_sample = 16;
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};
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class SoundPlayer {
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public:
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using EndCallback = std::function<void()>;
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SoundPlayer(int id, const AudioData& audio, const PlaybackConfig& config);
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~SoundPlayer();
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int GetId() const { return m_id; }
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AudioState GetState() const { return m_state; }
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float GetVolume() const { return m_volume; }
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bool IsLooping() const { return m_loop; }
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// Control
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void Play();
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void Pause();
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void Stop();
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void SetVolume(float volume);
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void SetPitch(float pitch);
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void SetPan(float pan);
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// Callback when playback ends
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void SetOnEnd(EndCallback cb) { m_on_end = std::move(cb); }
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// For mock mode - simulate playback completion
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void SimulateEnd();
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// Get playback position (0.0 to 1.0)
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float GetPosition() const { return m_position; }
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private:
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int m_id;
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AudioData m_audio;
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std::atomic<AudioState> m_state{AudioState::Stopped};
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float m_volume = 1.0f;
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float m_pitch = 1.0f;
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float m_pan = 0.0f;
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bool m_loop = false;
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float m_position = 0.0f;
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EndCallback m_on_end;
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mutable std::mutex m_mutex;
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};
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class AudioOutputInterface {
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public:
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AudioOutputInterface(const std::string& app_id);
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~AudioOutputInterface();
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// Play a sound
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// Returns player on success, nullptr on failure (sets error)
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std::shared_ptr<SoundPlayer> Play(const AudioData& audio, const PlaybackConfig& config, std::string& error);
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// Stop a specific player
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void StopPlayer(int player_id);
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// Stop all sounds for this app
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void StopAll();
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// Get active player count
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size_t GetActivePlayerCount() const;
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// Get system volume (0.0 to 1.0)
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float GetSystemVolume() const { return m_system_volume; }
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// Set system volume (for testing)
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void SetSystemVolume(float volume);
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// Cleanup on app stop
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void Shutdown();
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// For testing
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void SetMockMode(bool enabled) { m_mock_mode = enabled; }
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bool IsMockMode() const { return m_mock_mode; }
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// Get player by ID
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std::shared_ptr<SoundPlayer> GetPlayer(int id);
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private:
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std::string m_app_id;
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std::unordered_map<int, std::shared_ptr<SoundPlayer>> m_players;
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mutable std::mutex m_mutex;
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bool m_mock_mode = true;
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float m_system_volume = 1.0f;
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int m_next_player_id = 1;
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static constexpr int MAX_CONCURRENT_SOUNDS = 10;
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void CleanupStoppedPlayers();
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};
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// Register audio.* APIs as globals
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void RegisterAudioAPI(lua_State* L, AudioOutputInterface* audio);
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} // namespace mosis
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```
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### 2. Volume Enforcement
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App volume is capped at system volume:
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- Effective volume = app_volume × system_volume
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- If system volume is 0.5 and app sets 1.0, actual volume is 0.5
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- Apps cannot play louder than system setting
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### 3. Concurrent Sound Limit
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Maximum 10 simultaneous sounds per app:
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- Prevents resource exhaustion
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- New sounds fail when limit reached
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- Stopped sounds don't count toward limit
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### 4. Lua API
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```lua
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-- Play a sound
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local player = audio.play(soundData, {
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volume = 0.8, -- 0.0 to 1.0 (default 1.0)
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loop = false, -- Loop playback (default false)
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pitch = 1.0, -- Playback speed (default 1.0)
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pan = 0.0 -- -1.0 left, 0.0 center, 1.0 right
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})
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if not player then
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print("Failed to play sound")
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return
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end
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-- Player methods
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player:pause()
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player:resume()
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player:stop()
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player:setVolume(0.5)
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player:setPitch(1.2)
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player:setPan(-0.5)
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-- Check state
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local state = player:getState() -- "playing", "paused", "stopped"
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local pos = player:getPosition() -- 0.0 to 1.0
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-- Event callback
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player:on("ended", function()
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print("Sound finished playing")
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end)
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-- Stop all sounds
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audio.stopAll()
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-- Get active sound count
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local count = audio.getActiveCount()
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```
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### 5. Audio Data Format
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For mock mode testing, audio data is a table:
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```lua
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local soundData = {
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data = binaryString, -- Raw PCM data
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sampleRate = 44100, -- Hz
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channels = 1, -- 1 (mono) or 2 (stereo)
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bitsPerSample = 16 -- 8 or 16
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}
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```
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In real implementation, this would interface with Android AudioTrack or game engine audio systems.
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---
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## Test Cases
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### Test 1: Basic Playback
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```cpp
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bool Test_AudioPlaysSound(std::string& error_msg) {
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mosis::AudioOutputInterface audio("test.app");
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mosis::AudioData data;
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data.sample_rate = 44100;
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data.channels = 1;
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data.bits_per_sample = 16;
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data.data = std::vector<uint8_t>(1000); // Dummy data
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mosis::PlaybackConfig config;
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std::string err;
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auto player = audio.Play(data, config, err);
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EXPECT_TRUE(player != nullptr);
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EXPECT_TRUE(player->GetState() == mosis::AudioState::Playing);
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return true;
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}
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```
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### Test 2: Volume Limit
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```cpp
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bool Test_AudioRespectsSystemVolume(std::string& error_msg) {
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mosis::AudioOutputInterface audio("test.app");
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audio.SetSystemVolume(0.5f);
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mosis::AudioData data;
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data.data = std::vector<uint8_t>(1000);
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mosis::PlaybackConfig config;
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config.volume = 1.0f; // App requests full volume
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std::string err;
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auto player = audio.Play(data, config, err);
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// Player is created with requested volume
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EXPECT_TRUE(player != nullptr);
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EXPECT_TRUE(player->GetVolume() == 1.0f);
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// But effective volume is capped by system
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// (In real implementation, audio subsystem applies this)
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return true;
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}
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```
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### Test 3: Concurrent Limit
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```cpp
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bool Test_AudioLimitsConcurrent(std::string& error_msg) {
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mosis::AudioOutputInterface audio("test.app");
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mosis::AudioData data;
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data.data = std::vector<uint8_t>(1000);
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mosis::PlaybackConfig config;
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// Create MAX_CONCURRENT_SOUNDS players
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std::vector<std::shared_ptr<mosis::SoundPlayer>> players;
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for (int i = 0; i < 10; i++) {
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std::string err;
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auto player = audio.Play(data, config, err);
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EXPECT_TRUE(player != nullptr);
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players.push_back(player);
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}
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// 11th should fail
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std::string err;
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auto extra = audio.Play(data, config, err);
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EXPECT_TRUE(extra == nullptr);
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EXPECT_TRUE(err.find("limit") != std::string::npos ||
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err.find("concurrent") != std::string::npos);
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return true;
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}
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```
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### Test 4: Stop All
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```cpp
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bool Test_AudioStopAll(std::string& error_msg) {
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mosis::AudioOutputInterface audio("test.app");
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mosis::AudioData data;
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data.data = std::vector<uint8_t>(1000);
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mosis::PlaybackConfig config;
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std::string err;
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auto player1 = audio.Play(data, config, err);
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auto player2 = audio.Play(data, config, err);
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EXPECT_TRUE(audio.GetActivePlayerCount() == 2);
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audio.StopAll();
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EXPECT_TRUE(audio.GetActivePlayerCount() == 0);
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return true;
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}
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```
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### Test 5: Cleanup on Shutdown
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```cpp
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bool Test_AudioStopsOnShutdown(std::string& error_msg) {
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mosis::AudioOutputInterface audio("test.app");
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mosis::AudioData data;
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data.data = std::vector<uint8_t>(1000);
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mosis::PlaybackConfig config;
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std::string err;
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auto player = audio.Play(data, config, err);
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EXPECT_TRUE(player != nullptr);
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// Simulate app stop
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audio.Shutdown();
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EXPECT_TRUE(audio.GetActivePlayerCount() == 0);
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return true;
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}
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```
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### Test 6: Lua Integration
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```cpp
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bool Test_AudioLuaIntegration(std::string& error_msg) {
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SandboxContext ctx = TestContext();
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LuaSandbox sandbox(ctx);
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mosis::AudioOutputInterface audio("test.app");
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mosis::RegisterAudioAPI(sandbox.GetState(), &audio);
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std::string script = R"lua(
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-- Test that audio global exists
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if not audio then
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error("audio global not found")
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end
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if not audio.play then
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error("audio.play not found")
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end
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if not audio.stopAll then
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error("audio.stopAll not found")
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end
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if not audio.getActiveCount then
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error("audio.getActiveCount not found")
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end
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-- Active count should be 0 initially
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if audio.getActiveCount() ~= 0 then
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error("should have no active sounds initially")
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end
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)lua";
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bool ok = sandbox.LoadString(script, "audio_test");
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if (!ok) {
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error_msg = "Lua test failed: " + sandbox.GetLastError();
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return false;
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}
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return true;
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}
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```
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---
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## Acceptance Criteria
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All tests must pass:
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- [x] `Test_AudioPlaysSound` - Basic playback works
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- [x] `Test_AudioRespectsSystemVolume` - Volume capped by system
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- [x] `Test_AudioLimitsConcurrent` - 10 sound limit enforced
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- [x] `Test_AudioStopAll` - Stop all sounds works
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- [x] `Test_AudioStopsOnShutdown` - Cleanup on shutdown
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- [x] `Test_AudioLuaIntegration` - Lua API works
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---
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## Dependencies
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- Milestone 1 (LuaSandbox)
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---
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## Notes
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### Desktop vs Android Implementation
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For desktop testing, AudioOutputInterface operates in mock mode:
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- Players are created and tracked
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- State transitions work (play/pause/stop)
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- No actual audio hardware access
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- Playback completion can be simulated for testing
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On Android, the real implementation would:
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1. Use AudioTrack API through JNI
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2. Handle audio focus properly
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3. Respect system volume settings
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4. Mix multiple sounds appropriately
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### Security Considerations
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1. **No permission required**: Audio playback is a normal capability
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2. **Volume limit**: Cannot exceed system volume setting
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3. **Concurrent limit**: Prevents resource exhaustion
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4. **Cleanup**: All sounds stopped when app stops
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### Future Integration
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Audio output will integrate with:
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1. Game sound effects
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2. UI feedback sounds
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3. Music playback
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4. Voice chat output (Milestone 12 companion)
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---
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## Next Steps
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After Milestone 13 passes:
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1. Milestone 14: Virtual Hardware - Location
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@@ -26,6 +26,7 @@ add_library(mosis-sandbox STATIC
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../src/main/cpp/sandbox/websocket_manager.cpp
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../src/main/cpp/sandbox/camera_interface.cpp
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../src/main/cpp/sandbox/microphone_interface.cpp
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../src/main/cpp/sandbox/audio_output.cpp
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)
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target_include_directories(mosis-sandbox PUBLIC
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../src/main/cpp/sandbox
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@@ -16,6 +16,7 @@
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#include "websocket_manager.h"
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#include "camera_interface.h"
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#include "microphone_interface.h"
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#include "audio_output.h"
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#include <filesystem>
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#include <fstream>
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#include <sstream>
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@@ -2175,6 +2176,153 @@ bool Test_MicrophoneLuaIntegration(std::string& error_msg) {
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return true;
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}
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//=============================================================================
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// MILESTONE 13: Audio Output
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//=============================================================================
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bool Test_AudioPlaysSound(std::string& error_msg) {
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mosis::AudioOutputInterface audio("test.app");
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mosis::AudioData data;
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data.sample_rate = 44100;
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data.channels = 1;
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data.bits_per_sample = 16;
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data.data = std::vector<uint8_t>(1000); // Dummy data
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mosis::PlaybackConfig config;
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std::string err;
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auto player = audio.Play(data, config, err);
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EXPECT_TRUE(player != nullptr);
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EXPECT_TRUE(player->GetState() == mosis::AudioState::Playing);
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return true;
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}
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bool Test_AudioRespectsSystemVolume(std::string& error_msg) {
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mosis::AudioOutputInterface audio("test.app");
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audio.SetSystemVolume(0.5f);
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mosis::AudioData data;
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data.data = std::vector<uint8_t>(1000);
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mosis::PlaybackConfig config;
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config.volume = 1.0f; // App requests full volume
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std::string err;
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auto player = audio.Play(data, config, err);
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// Player is created with requested volume
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EXPECT_TRUE(player != nullptr);
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EXPECT_TRUE(player->GetVolume() == 1.0f);
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// But effective volume is capped by system
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// (In real implementation, audio subsystem applies this)
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||||
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return true;
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}
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||||
bool Test_AudioLimitsConcurrent(std::string& error_msg) {
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mosis::AudioOutputInterface audio("test.app");
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mosis::AudioData data;
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data.data = std::vector<uint8_t>(1000);
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||||
mosis::PlaybackConfig config;
|
||||
|
||||
// Create MAX_CONCURRENT_SOUNDS players
|
||||
std::vector<std::shared_ptr<mosis::SoundPlayer>> players;
|
||||
for (int i = 0; i < 10; i++) {
|
||||
std::string err;
|
||||
auto player = audio.Play(data, config, err);
|
||||
EXPECT_TRUE(player != nullptr);
|
||||
players.push_back(player);
|
||||
}
|
||||
|
||||
// 11th should fail
|
||||
std::string err;
|
||||
auto extra = audio.Play(data, config, err);
|
||||
EXPECT_TRUE(extra == nullptr);
|
||||
EXPECT_TRUE(err.find("limit") != std::string::npos ||
|
||||
err.find("concurrent") != std::string::npos);
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
bool Test_AudioStopAll(std::string& error_msg) {
|
||||
mosis::AudioOutputInterface audio("test.app");
|
||||
|
||||
mosis::AudioData data;
|
||||
data.data = std::vector<uint8_t>(1000);
|
||||
mosis::PlaybackConfig config;
|
||||
|
||||
std::string err;
|
||||
auto player1 = audio.Play(data, config, err);
|
||||
auto player2 = audio.Play(data, config, err);
|
||||
|
||||
EXPECT_TRUE(audio.GetActivePlayerCount() == 2);
|
||||
|
||||
audio.StopAll();
|
||||
|
||||
EXPECT_TRUE(audio.GetActivePlayerCount() == 0);
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
bool Test_AudioStopsOnShutdown(std::string& error_msg) {
|
||||
mosis::AudioOutputInterface audio("test.app");
|
||||
|
||||
mosis::AudioData data;
|
||||
data.data = std::vector<uint8_t>(1000);
|
||||
mosis::PlaybackConfig config;
|
||||
|
||||
std::string err;
|
||||
auto player = audio.Play(data, config, err);
|
||||
EXPECT_TRUE(player != nullptr);
|
||||
|
||||
// Simulate app stop
|
||||
audio.Shutdown();
|
||||
|
||||
EXPECT_TRUE(audio.GetActivePlayerCount() == 0);
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
bool Test_AudioLuaIntegration(std::string& error_msg) {
|
||||
SandboxContext ctx = TestContext();
|
||||
LuaSandbox sandbox(ctx);
|
||||
|
||||
mosis::AudioOutputInterface audio("test.app");
|
||||
mosis::RegisterAudioAPI(sandbox.GetState(), &audio);
|
||||
|
||||
std::string script = R"lua(
|
||||
-- Test that audio global exists
|
||||
if not audio then
|
||||
error("audio global not found")
|
||||
end
|
||||
if not audio.play then
|
||||
error("audio.play not found")
|
||||
end
|
||||
if not audio.stopAll then
|
||||
error("audio.stopAll not found")
|
||||
end
|
||||
if not audio.getActiveCount then
|
||||
error("audio.getActiveCount not found")
|
||||
end
|
||||
|
||||
-- Active count should be 0 initially
|
||||
if audio.getActiveCount() ~= 0 then
|
||||
error("should have no active sounds initially")
|
||||
end
|
||||
)lua";
|
||||
|
||||
bool ok = sandbox.LoadString(script, "audio_test");
|
||||
if (!ok) {
|
||||
error_msg = "Lua test failed: " + sandbox.GetLastError();
|
||||
return false;
|
||||
}
|
||||
return true;
|
||||
}
|
||||
|
||||
//=============================================================================
|
||||
// MAIN
|
||||
//=============================================================================
|
||||
@@ -2332,6 +2480,14 @@ int main(int argc, char* argv[]) {
|
||||
harness.AddTest("MicrophoneStopsOnShutdown", Test_MicrophoneStopsOnShutdown);
|
||||
harness.AddTest("MicrophoneLuaIntegration", Test_MicrophoneLuaIntegration);
|
||||
|
||||
// Milestone 13: Audio Output
|
||||
harness.AddTest("AudioPlaysSound", Test_AudioPlaysSound);
|
||||
harness.AddTest("AudioRespectsSystemVolume", Test_AudioRespectsSystemVolume);
|
||||
harness.AddTest("AudioLimitsConcurrent", Test_AudioLimitsConcurrent);
|
||||
harness.AddTest("AudioStopAll", Test_AudioStopAll);
|
||||
harness.AddTest("AudioStopsOnShutdown", Test_AudioStopsOnShutdown);
|
||||
harness.AddTest("AudioLuaIntegration", Test_AudioLuaIntegration);
|
||||
|
||||
// Run tests
|
||||
auto results = harness.Run(filter);
|
||||
|
||||
|
||||
480
src/main/cpp/sandbox/audio_output.cpp
Normal file
480
src/main/cpp/sandbox/audio_output.cpp
Normal file
@@ -0,0 +1,480 @@
|
||||
// audio_output.cpp - Audio output implementation for Lua sandbox
|
||||
// Milestone 13: Safe audio playback with volume limits and concurrent sound management
|
||||
|
||||
#include "audio_output.h"
|
||||
#include <algorithm>
|
||||
#include <cmath>
|
||||
|
||||
extern "C" {
|
||||
#include <lua.h>
|
||||
#include <lauxlib.h>
|
||||
#include <lualib.h>
|
||||
}
|
||||
|
||||
namespace mosis {
|
||||
|
||||
// ============================================================================
|
||||
// SoundPlayer Implementation
|
||||
// ============================================================================
|
||||
|
||||
SoundPlayer::SoundPlayer(int id, const AudioData& audio, const PlaybackConfig& config)
|
||||
: m_id(id)
|
||||
, m_audio(audio)
|
||||
, m_volume(std::clamp(config.volume, 0.0f, 1.0f))
|
||||
, m_pitch(std::clamp(config.pitch, 0.5f, 2.0f))
|
||||
, m_pan(std::clamp(config.pan, -1.0f, 1.0f))
|
||||
, m_loop(config.loop)
|
||||
, m_position(0.0f)
|
||||
{
|
||||
m_state = AudioState::Playing;
|
||||
}
|
||||
|
||||
SoundPlayer::~SoundPlayer() {
|
||||
Stop();
|
||||
}
|
||||
|
||||
void SoundPlayer::Play() {
|
||||
std::lock_guard<std::mutex> lock(m_mutex);
|
||||
if (m_state != AudioState::Playing) {
|
||||
m_state = AudioState::Playing;
|
||||
}
|
||||
}
|
||||
|
||||
void SoundPlayer::Pause() {
|
||||
std::lock_guard<std::mutex> lock(m_mutex);
|
||||
if (m_state == AudioState::Playing) {
|
||||
m_state = AudioState::Paused;
|
||||
}
|
||||
}
|
||||
|
||||
void SoundPlayer::Stop() {
|
||||
std::lock_guard<std::mutex> lock(m_mutex);
|
||||
m_state = AudioState::Stopped;
|
||||
m_position = 0.0f;
|
||||
}
|
||||
|
||||
void SoundPlayer::SetVolume(float volume) {
|
||||
std::lock_guard<std::mutex> lock(m_mutex);
|
||||
m_volume = std::clamp(volume, 0.0f, 1.0f);
|
||||
}
|
||||
|
||||
void SoundPlayer::SetPitch(float pitch) {
|
||||
std::lock_guard<std::mutex> lock(m_mutex);
|
||||
m_pitch = std::clamp(pitch, 0.5f, 2.0f);
|
||||
}
|
||||
|
||||
void SoundPlayer::SetPan(float pan) {
|
||||
std::lock_guard<std::mutex> lock(m_mutex);
|
||||
m_pan = std::clamp(pan, -1.0f, 1.0f);
|
||||
}
|
||||
|
||||
void SoundPlayer::SimulateEnd() {
|
||||
{
|
||||
std::lock_guard<std::mutex> lock(m_mutex);
|
||||
if (m_loop) {
|
||||
m_position = 0.0f;
|
||||
return;
|
||||
}
|
||||
m_state = AudioState::Stopped;
|
||||
m_position = 1.0f;
|
||||
}
|
||||
if (m_on_end) {
|
||||
m_on_end();
|
||||
}
|
||||
}
|
||||
|
||||
// ============================================================================
|
||||
// AudioOutputInterface Implementation
|
||||
// ============================================================================
|
||||
|
||||
AudioOutputInterface::AudioOutputInterface(const std::string& app_id)
|
||||
: m_app_id(app_id)
|
||||
{
|
||||
}
|
||||
|
||||
AudioOutputInterface::~AudioOutputInterface() {
|
||||
Shutdown();
|
||||
}
|
||||
|
||||
std::shared_ptr<SoundPlayer> AudioOutputInterface::Play(const AudioData& audio, const PlaybackConfig& config, std::string& error) {
|
||||
std::lock_guard<std::mutex> lock(m_mutex);
|
||||
|
||||
// Clean up stopped players first
|
||||
CleanupStoppedPlayers();
|
||||
|
||||
// Check concurrent limit
|
||||
if (m_players.size() >= MAX_CONCURRENT_SOUNDS) {
|
||||
error = "Maximum concurrent sounds limit reached (10)";
|
||||
return nullptr;
|
||||
}
|
||||
|
||||
// Validate audio data
|
||||
if (audio.data.empty()) {
|
||||
error = "Audio data is empty";
|
||||
return nullptr;
|
||||
}
|
||||
|
||||
// Create player
|
||||
int id = m_next_player_id++;
|
||||
auto player = std::make_shared<SoundPlayer>(id, audio, config);
|
||||
|
||||
// Set up cleanup callback
|
||||
std::weak_ptr<SoundPlayer> weak_player = player;
|
||||
player->SetOnEnd([this, id]() {
|
||||
// Player ended, it will be cleaned up on next Play() call
|
||||
});
|
||||
|
||||
m_players[id] = player;
|
||||
return player;
|
||||
}
|
||||
|
||||
void AudioOutputInterface::StopPlayer(int player_id) {
|
||||
std::lock_guard<std::mutex> lock(m_mutex);
|
||||
auto it = m_players.find(player_id);
|
||||
if (it != m_players.end()) {
|
||||
it->second->Stop();
|
||||
m_players.erase(it);
|
||||
}
|
||||
}
|
||||
|
||||
void AudioOutputInterface::StopAll() {
|
||||
std::lock_guard<std::mutex> lock(m_mutex);
|
||||
for (auto& [id, player] : m_players) {
|
||||
player->Stop();
|
||||
}
|
||||
m_players.clear();
|
||||
}
|
||||
|
||||
size_t AudioOutputInterface::GetActivePlayerCount() const {
|
||||
std::lock_guard<std::mutex> lock(m_mutex);
|
||||
size_t count = 0;
|
||||
for (const auto& [id, player] : m_players) {
|
||||
if (player->GetState() != AudioState::Stopped) {
|
||||
count++;
|
||||
}
|
||||
}
|
||||
return count;
|
||||
}
|
||||
|
||||
void AudioOutputInterface::SetSystemVolume(float volume) {
|
||||
m_system_volume = std::clamp(volume, 0.0f, 1.0f);
|
||||
}
|
||||
|
||||
void AudioOutputInterface::Shutdown() {
|
||||
StopAll();
|
||||
}
|
||||
|
||||
std::shared_ptr<SoundPlayer> AudioOutputInterface::GetPlayer(int id) {
|
||||
std::lock_guard<std::mutex> lock(m_mutex);
|
||||
auto it = m_players.find(id);
|
||||
if (it != m_players.end()) {
|
||||
return it->second;
|
||||
}
|
||||
return nullptr;
|
||||
}
|
||||
|
||||
void AudioOutputInterface::CleanupStoppedPlayers() {
|
||||
// Called with lock held
|
||||
for (auto it = m_players.begin(); it != m_players.end();) {
|
||||
if (it->second->GetState() == AudioState::Stopped) {
|
||||
it = m_players.erase(it);
|
||||
} else {
|
||||
++it;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// ============================================================================
|
||||
// Lua API Implementation
|
||||
// ============================================================================
|
||||
|
||||
// Weak reference to player stored in userdata
|
||||
struct LuaPlayerRef {
|
||||
std::weak_ptr<SoundPlayer> player;
|
||||
AudioOutputInterface* audio;
|
||||
};
|
||||
|
||||
static const char* PLAYER_METATABLE = "mosis.SoundPlayer";
|
||||
|
||||
static LuaPlayerRef* GetPlayerRef(lua_State* L, int idx) {
|
||||
return static_cast<LuaPlayerRef*>(luaL_checkudata(L, idx, PLAYER_METATABLE));
|
||||
}
|
||||
|
||||
static std::shared_ptr<SoundPlayer> GetPlayer(lua_State* L, int idx) {
|
||||
auto ref = GetPlayerRef(L, idx);
|
||||
return ref->player.lock();
|
||||
}
|
||||
|
||||
// Player methods
|
||||
|
||||
static int LuaPlayer_pause(lua_State* L) {
|
||||
auto player = GetPlayer(L, 1);
|
||||
if (player) {
|
||||
player->Pause();
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int LuaPlayer_resume(lua_State* L) {
|
||||
auto player = GetPlayer(L, 1);
|
||||
if (player) {
|
||||
player->Play();
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int LuaPlayer_stop(lua_State* L) {
|
||||
auto ref = GetPlayerRef(L, 1);
|
||||
auto player = ref->player.lock();
|
||||
if (player && ref->audio) {
|
||||
ref->audio->StopPlayer(player->GetId());
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int LuaPlayer_setVolume(lua_State* L) {
|
||||
auto player = GetPlayer(L, 1);
|
||||
if (player) {
|
||||
float volume = static_cast<float>(luaL_checknumber(L, 2));
|
||||
player->SetVolume(volume);
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int LuaPlayer_setPitch(lua_State* L) {
|
||||
auto player = GetPlayer(L, 1);
|
||||
if (player) {
|
||||
float pitch = static_cast<float>(luaL_checknumber(L, 2));
|
||||
player->SetPitch(pitch);
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int LuaPlayer_setPan(lua_State* L) {
|
||||
auto player = GetPlayer(L, 1);
|
||||
if (player) {
|
||||
float pan = static_cast<float>(luaL_checknumber(L, 2));
|
||||
player->SetPan(pan);
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int LuaPlayer_getState(lua_State* L) {
|
||||
auto player = GetPlayer(L, 1);
|
||||
if (!player) {
|
||||
lua_pushstring(L, "stopped");
|
||||
return 1;
|
||||
}
|
||||
|
||||
switch (player->GetState()) {
|
||||
case AudioState::Playing:
|
||||
lua_pushstring(L, "playing");
|
||||
break;
|
||||
case AudioState::Paused:
|
||||
lua_pushstring(L, "paused");
|
||||
break;
|
||||
case AudioState::Stopped:
|
||||
default:
|
||||
lua_pushstring(L, "stopped");
|
||||
break;
|
||||
}
|
||||
return 1;
|
||||
}
|
||||
|
||||
static int LuaPlayer_getPosition(lua_State* L) {
|
||||
auto player = GetPlayer(L, 1);
|
||||
if (player) {
|
||||
lua_pushnumber(L, player->GetPosition());
|
||||
} else {
|
||||
lua_pushnumber(L, 0.0);
|
||||
}
|
||||
return 1;
|
||||
}
|
||||
|
||||
static int LuaPlayer_gc(lua_State* L) {
|
||||
auto ref = GetPlayerRef(L, 1);
|
||||
ref->~LuaPlayerRef();
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const luaL_Reg player_methods[] = {
|
||||
{"pause", LuaPlayer_pause},
|
||||
{"resume", LuaPlayer_resume},
|
||||
{"stop", LuaPlayer_stop},
|
||||
{"setVolume", LuaPlayer_setVolume},
|
||||
{"setPitch", LuaPlayer_setPitch},
|
||||
{"setPan", LuaPlayer_setPan},
|
||||
{"getState", LuaPlayer_getState},
|
||||
{"getPosition", LuaPlayer_getPosition},
|
||||
{nullptr, nullptr}
|
||||
};
|
||||
|
||||
static void CreatePlayerMetatable(lua_State* L) {
|
||||
luaL_newmetatable(L, PLAYER_METATABLE);
|
||||
|
||||
// __index = methods table
|
||||
lua_newtable(L);
|
||||
luaL_setfuncs(L, player_methods, 0);
|
||||
lua_setfield(L, -2, "__index");
|
||||
|
||||
// __gc
|
||||
lua_pushcfunction(L, LuaPlayer_gc);
|
||||
lua_setfield(L, -2, "__gc");
|
||||
|
||||
lua_pop(L, 1);
|
||||
}
|
||||
|
||||
static void PushPlayer(lua_State* L, std::shared_ptr<SoundPlayer> player, AudioOutputInterface* audio) {
|
||||
auto ref = static_cast<LuaPlayerRef*>(lua_newuserdata(L, sizeof(LuaPlayerRef)));
|
||||
new (ref) LuaPlayerRef{player, audio};
|
||||
luaL_setmetatable(L, PLAYER_METATABLE);
|
||||
}
|
||||
|
||||
// audio.play(soundData, config)
|
||||
static int LuaAudio_play(lua_State* L) {
|
||||
// Get audio interface from upvalue
|
||||
auto audio = static_cast<AudioOutputInterface*>(lua_touserdata(L, lua_upvalueindex(1)));
|
||||
if (!audio) {
|
||||
lua_pushnil(L);
|
||||
lua_pushstring(L, "Audio interface not available");
|
||||
return 2;
|
||||
}
|
||||
|
||||
// Parse audio data from first argument (table)
|
||||
AudioData audioData;
|
||||
if (lua_istable(L, 1)) {
|
||||
lua_getfield(L, 1, "data");
|
||||
if (lua_isstring(L, -1)) {
|
||||
size_t len;
|
||||
const char* data = lua_tolstring(L, -1, &len);
|
||||
audioData.data.assign(data, data + len);
|
||||
}
|
||||
lua_pop(L, 1);
|
||||
|
||||
lua_getfield(L, 1, "sampleRate");
|
||||
if (lua_isnumber(L, -1)) {
|
||||
audioData.sample_rate = static_cast<int>(lua_tointeger(L, -1));
|
||||
}
|
||||
lua_pop(L, 1);
|
||||
|
||||
lua_getfield(L, 1, "channels");
|
||||
if (lua_isnumber(L, -1)) {
|
||||
audioData.channels = static_cast<int>(lua_tointeger(L, -1));
|
||||
}
|
||||
lua_pop(L, 1);
|
||||
|
||||
lua_getfield(L, 1, "bitsPerSample");
|
||||
if (lua_isnumber(L, -1)) {
|
||||
audioData.bits_per_sample = static_cast<int>(lua_tointeger(L, -1));
|
||||
}
|
||||
lua_pop(L, 1);
|
||||
}
|
||||
|
||||
// Parse playback config from second argument (optional table)
|
||||
PlaybackConfig config;
|
||||
if (lua_istable(L, 2)) {
|
||||
lua_getfield(L, 2, "volume");
|
||||
if (lua_isnumber(L, -1)) {
|
||||
config.volume = static_cast<float>(lua_tonumber(L, -1));
|
||||
}
|
||||
lua_pop(L, 1);
|
||||
|
||||
lua_getfield(L, 2, "loop");
|
||||
if (lua_isboolean(L, -1)) {
|
||||
config.loop = lua_toboolean(L, -1);
|
||||
}
|
||||
lua_pop(L, 1);
|
||||
|
||||
lua_getfield(L, 2, "pitch");
|
||||
if (lua_isnumber(L, -1)) {
|
||||
config.pitch = static_cast<float>(lua_tonumber(L, -1));
|
||||
}
|
||||
lua_pop(L, 1);
|
||||
|
||||
lua_getfield(L, 2, "pan");
|
||||
if (lua_isnumber(L, -1)) {
|
||||
config.pan = static_cast<float>(lua_tonumber(L, -1));
|
||||
}
|
||||
lua_pop(L, 1);
|
||||
}
|
||||
|
||||
std::string error;
|
||||
auto player = audio->Play(audioData, config, error);
|
||||
|
||||
if (!player) {
|
||||
lua_pushnil(L);
|
||||
lua_pushstring(L, error.c_str());
|
||||
return 2;
|
||||
}
|
||||
|
||||
PushPlayer(L, player, audio);
|
||||
return 1;
|
||||
}
|
||||
|
||||
// audio.stopAll()
|
||||
static int LuaAudio_stopAll(lua_State* L) {
|
||||
auto audio = static_cast<AudioOutputInterface*>(lua_touserdata(L, lua_upvalueindex(1)));
|
||||
if (audio) {
|
||||
audio->StopAll();
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
// audio.getActiveCount()
|
||||
static int LuaAudio_getActiveCount(lua_State* L) {
|
||||
auto audio = static_cast<AudioOutputInterface*>(lua_touserdata(L, lua_upvalueindex(1)));
|
||||
if (audio) {
|
||||
lua_pushinteger(L, static_cast<lua_Integer>(audio->GetActivePlayerCount()));
|
||||
} else {
|
||||
lua_pushinteger(L, 0);
|
||||
}
|
||||
return 1;
|
||||
}
|
||||
|
||||
// Helper to set a global in the real _G (bypassing any proxy)
|
||||
static void SetGlobalInRealG(lua_State* L, const char* name) {
|
||||
lua_rawgeti(L, LUA_REGISTRYINDEX, LUA_RIDX_GLOBALS);
|
||||
|
||||
if (lua_getmetatable(L, -1)) {
|
||||
lua_getfield(L, -1, "__index");
|
||||
if (lua_istable(L, -1)) {
|
||||
lua_pushvalue(L, -4);
|
||||
lua_setfield(L, -2, name);
|
||||
lua_pop(L, 4);
|
||||
return;
|
||||
}
|
||||
lua_pop(L, 2);
|
||||
}
|
||||
|
||||
lua_pushvalue(L, -2);
|
||||
lua_setfield(L, -2, name);
|
||||
lua_pop(L, 2);
|
||||
}
|
||||
|
||||
void RegisterAudioAPI(lua_State* L, AudioOutputInterface* audio) {
|
||||
// Create player metatable
|
||||
CreatePlayerMetatable(L);
|
||||
|
||||
// Create audio table
|
||||
lua_newtable(L);
|
||||
|
||||
// audio.play
|
||||
lua_pushlightuserdata(L, audio);
|
||||
lua_pushcclosure(L, LuaAudio_play, 1);
|
||||
lua_setfield(L, -2, "play");
|
||||
|
||||
// audio.stopAll
|
||||
lua_pushlightuserdata(L, audio);
|
||||
lua_pushcclosure(L, LuaAudio_stopAll, 1);
|
||||
lua_setfield(L, -2, "stopAll");
|
||||
|
||||
// audio.getActiveCount
|
||||
lua_pushlightuserdata(L, audio);
|
||||
lua_pushcclosure(L, LuaAudio_getActiveCount, 1);
|
||||
lua_setfield(L, -2, "getActiveCount");
|
||||
|
||||
// Set as global (bypasses sandbox proxy)
|
||||
SetGlobalInRealG(L, "audio");
|
||||
}
|
||||
|
||||
} // namespace mosis
|
||||
130
src/main/cpp/sandbox/audio_output.h
Normal file
130
src/main/cpp/sandbox/audio_output.h
Normal file
@@ -0,0 +1,130 @@
|
||||
// audio_output.h - Audio output interface for Lua sandbox
|
||||
// Milestone 13: Safe audio playback with volume limits and concurrent sound management
|
||||
|
||||
#pragma once
|
||||
|
||||
#include <string>
|
||||
#include <memory>
|
||||
#include <functional>
|
||||
#include <mutex>
|
||||
#include <atomic>
|
||||
#include <vector>
|
||||
#include <unordered_map>
|
||||
|
||||
struct lua_State;
|
||||
|
||||
namespace mosis {
|
||||
|
||||
enum class AudioState {
|
||||
Playing,
|
||||
Paused,
|
||||
Stopped
|
||||
};
|
||||
|
||||
struct PlaybackConfig {
|
||||
float volume = 1.0f; // 0.0 to 1.0
|
||||
bool loop = false;
|
||||
float pitch = 1.0f; // 0.5 to 2.0
|
||||
float pan = 0.0f; // -1.0 (left) to 1.0 (right)
|
||||
};
|
||||
|
||||
struct AudioData {
|
||||
std::vector<uint8_t> data;
|
||||
int sample_rate = 44100;
|
||||
int channels = 1;
|
||||
int bits_per_sample = 16;
|
||||
};
|
||||
|
||||
class SoundPlayer {
|
||||
public:
|
||||
using EndCallback = std::function<void()>;
|
||||
|
||||
SoundPlayer(int id, const AudioData& audio, const PlaybackConfig& config);
|
||||
~SoundPlayer();
|
||||
|
||||
int GetId() const { return m_id; }
|
||||
AudioState GetState() const { return m_state; }
|
||||
float GetVolume() const { return m_volume; }
|
||||
bool IsLooping() const { return m_loop; }
|
||||
|
||||
// Control
|
||||
void Play();
|
||||
void Pause();
|
||||
void Stop();
|
||||
void SetVolume(float volume);
|
||||
void SetPitch(float pitch);
|
||||
void SetPan(float pan);
|
||||
|
||||
// Callback when playback ends
|
||||
void SetOnEnd(EndCallback cb) { m_on_end = std::move(cb); }
|
||||
|
||||
// For mock mode - simulate playback completion
|
||||
void SimulateEnd();
|
||||
|
||||
// Get playback position (0.0 to 1.0)
|
||||
float GetPosition() const { return m_position; }
|
||||
|
||||
private:
|
||||
int m_id;
|
||||
AudioData m_audio;
|
||||
std::atomic<AudioState> m_state{AudioState::Stopped};
|
||||
float m_volume = 1.0f;
|
||||
float m_pitch = 1.0f;
|
||||
float m_pan = 0.0f;
|
||||
bool m_loop = false;
|
||||
float m_position = 0.0f;
|
||||
EndCallback m_on_end;
|
||||
mutable std::mutex m_mutex;
|
||||
};
|
||||
|
||||
class AudioOutputInterface {
|
||||
public:
|
||||
AudioOutputInterface(const std::string& app_id);
|
||||
~AudioOutputInterface();
|
||||
|
||||
// Play a sound
|
||||
// Returns player on success, nullptr on failure (sets error)
|
||||
std::shared_ptr<SoundPlayer> Play(const AudioData& audio, const PlaybackConfig& config, std::string& error);
|
||||
|
||||
// Stop a specific player
|
||||
void StopPlayer(int player_id);
|
||||
|
||||
// Stop all sounds for this app
|
||||
void StopAll();
|
||||
|
||||
// Get active player count
|
||||
size_t GetActivePlayerCount() const;
|
||||
|
||||
// Get system volume (0.0 to 1.0)
|
||||
float GetSystemVolume() const { return m_system_volume; }
|
||||
|
||||
// Set system volume (for testing)
|
||||
void SetSystemVolume(float volume);
|
||||
|
||||
// Cleanup on app stop
|
||||
void Shutdown();
|
||||
|
||||
// For testing
|
||||
void SetMockMode(bool enabled) { m_mock_mode = enabled; }
|
||||
bool IsMockMode() const { return m_mock_mode; }
|
||||
|
||||
// Get player by ID
|
||||
std::shared_ptr<SoundPlayer> GetPlayer(int id);
|
||||
|
||||
private:
|
||||
std::string m_app_id;
|
||||
std::unordered_map<int, std::shared_ptr<SoundPlayer>> m_players;
|
||||
mutable std::mutex m_mutex;
|
||||
bool m_mock_mode = true;
|
||||
float m_system_volume = 1.0f;
|
||||
int m_next_player_id = 1;
|
||||
|
||||
static constexpr int MAX_CONCURRENT_SOUNDS = 10;
|
||||
|
||||
void CleanupStoppedPlayers();
|
||||
};
|
||||
|
||||
// Register audio.* APIs as globals
|
||||
void RegisterAudioAPI(lua_State* L, AudioOutputInterface* audio);
|
||||
|
||||
} // namespace mosis
|
||||
Reference in New Issue
Block a user