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90 lines
3.1 KiB
C
90 lines
3.1 KiB
C
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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim:set ts=2 sw=2 sts=2 et cindent: */
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/*
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* Copyright (c) 2014 The Linux Foundation. All rights reserved.
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* Copyright (C) 2007 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef AUDIO_SINK_H_
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#define AUDIO_SINK_H_
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#include <utils/Errors.h>
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#include <utils/String8.h>
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#include <system/audio.h>
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#define DEFAULT_AUDIOSINK_BUFFERCOUNT 4
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#define DEFAULT_AUDIOSINK_BUFFERSIZE 1200
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#define DEFAULT_AUDIOSINK_SAMPLERATE 44100
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// when the channel mask isn't known, use the channel count to derive a mask in
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// AudioSink::open()
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#define CHANNEL_MASK_USE_CHANNEL_ORDER 0
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namespace mozilla {
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/**
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* AudioSink: abstraction layer for audio output
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* Stripped version of Android KK MediaPlayerBase::AudioSink class
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*/
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class AudioSink : public android::RefBase
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{
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typedef android::String8 String8;
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typedef android::status_t status_t;
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public:
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enum cb_event_t {
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CB_EVENT_FILL_BUFFER, // Request to write more data to buffer.
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CB_EVENT_STREAM_END, // Sent after all the buffers queued in AF and HW
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// are played back (after stop is called)
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CB_EVENT_TEAR_DOWN // The AudioTrack was invalidated due to usecase
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// change. Need to re-evaluate offloading options
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};
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// Callback returns the number of bytes actually written to the buffer.
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typedef size_t (*AudioCallback)(AudioSink* aAudioSink,
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void* aBuffer,
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size_t aSize,
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void* aCookie,
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cb_event_t aEvent);
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virtual ~AudioSink() {}
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virtual ssize_t FrameSize() const = 0;
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virtual status_t GetPosition(uint32_t* aPosition) const = 0;
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virtual status_t SetVolume(float aVolume) const = 0;
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virtual status_t SetParameters(const String8& aKeyValuePairs)
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{
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return android::NO_ERROR;
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}
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virtual status_t Open(uint32_t aSampleRate,
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int aChannelCount,
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audio_channel_mask_t aChannelMask,
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audio_format_t aFormat=AUDIO_FORMAT_PCM_16_BIT,
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AudioCallback aCb = nullptr,
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void* aCookie = nullptr,
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audio_output_flags_t aFlags = AUDIO_OUTPUT_FLAG_NONE,
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const audio_offload_info_t* aOffloadInfo = nullptr) = 0;
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virtual status_t Start() = 0;
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virtual void Stop() = 0;
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virtual void Flush() = 0;
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virtual void Pause() = 0;
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virtual void Close() = 0;
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};
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} // namespace mozilla
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#endif // AUDIO_SINK_H_
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