// Copyright 2026 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CHROME_COMMON_READALOUD_READ_ALOUD_CONSTANTS_H_
#define CHROME_COMMON_READALOUD_READ_ALOUD_CONSTANTS_H_

#include <cstddef>

#include "base/time/time.h"
#include "media/base/channel_layout.h"

namespace readaloud {

inline constexpr int kAudioSampleRate = 48000;
inline constexpr media::ChannelLayout kAudioChannelLayout =
    media::CHANNEL_LAYOUT_MONO;
// 480 frames corresponds to a 10ms buffer duration at 48kHz.
inline constexpr int kAudioFramesPerBuffer = 480;

// 500 KiB cap.
inline constexpr size_t kMaxMojoPayloadSizeBytes = 512000;
inline constexpr base::TimeDelta kAudioBufferMinDuration = base::Seconds(5);
inline constexpr base::TimeDelta kAudioBufferPrefetchWatermark =
    base::Seconds(15);
inline constexpr base::TimeDelta kMaxDecodedAudioDuration = base::Seconds(50);
inline constexpr base::TimeDelta kNetworkTimeout = base::Seconds(5);
inline constexpr base::TimeDelta kBufferStallTimeout = base::Seconds(15);
inline constexpr base::TimeDelta kBrowserBufferingWatchdog = base::Seconds(30);
inline constexpr base::TimeDelta kVolumeRampDuration = base::Milliseconds(10);
inline constexpr int kMaxRetryAttempts = 3;

// Limits for text payload validation to prevent utility process memory exhaustion (OOM/DoS).
inline constexpr size_t kMaxTextSegments = 1000;
inline constexpr size_t kMaxTextLengthPerSegment = 65536;  // 64 KB max characters per segment
inline constexpr size_t kMaxVoiceIdLength = 256;

// Allowed range for speech speed rate scaling.
inline constexpr float kMinPlaybackRate = 0.25f;
inline constexpr float kMaxPlaybackRate = 4.0f;

}  // namespace readaloud

#endif  // CHROME_COMMON_READALOUD_READ_ALOUD_CONSTANTS_H_