gecko-dev/dom/media/omx/AudioSink.h

90 строки
3.1 KiB
C++

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