518 lines
20 KiB
C
518 lines
20 KiB
C
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/*
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* Copyright (C) 2007 The Android Open Source Project
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* Copyright (c) 2009-2011, The Linux Foundation. All rights reserved.
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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 ANDROID_AUDIOTRACK_H
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#define ANDROID_AUDIOTRACK_H
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#include <stdint.h>
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#include <sys/types.h>
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#include <media/IAudioFlinger.h>
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#include <media/IAudioTrack.h>
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#include <media/AudioSystem.h>
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#include <utils/RefBase.h>
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#include <utils/Errors.h>
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#include <binder/IInterface.h>
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#include <binder/IMemory.h>
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#include <utils/threads.h>
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namespace android {
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// ----------------------------------------------------------------------------
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class audio_track_cblk_t;
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// ----------------------------------------------------------------------------
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class AudioTrack
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{
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public:
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enum channel_index {
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MONO = 0,
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LEFT = 0,
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RIGHT = 1
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};
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/* Events used by AudioTrack callback function (audio_track_cblk_t).
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*/
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enum event_type {
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EVENT_MORE_DATA = 0, // Request to write more data to PCM buffer.
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EVENT_UNDERRUN = 1, // PCM buffer underrun occured.
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EVENT_LOOP_END = 2, // Sample loop end was reached; playback restarted from loop start if loop count was not 0.
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EVENT_MARKER = 3, // Playback head is at the specified marker position (See setMarkerPosition()).
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EVENT_NEW_POS = 4, // Playback head is at a new position (See setPositionUpdatePeriod()).
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EVENT_BUFFER_END = 5 // Playback head is at the end of the buffer.
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};
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/* Create Buffer on the stack and pass it to obtainBuffer()
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* and releaseBuffer().
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*/
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class Buffer
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{
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public:
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enum {
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MUTE = 0x00000001
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};
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uint32_t flags;
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int channelCount;
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int format;
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size_t frameCount;
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size_t size;
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union {
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void* raw;
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short* i16;
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int8_t* i8;
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};
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};
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/* As a convenience, if a callback is supplied, a handler thread
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* is automatically created with the appropriate priority. This thread
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* invokes the callback when a new buffer becomes availlable or an underrun condition occurs.
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* Parameters:
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*
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* event: type of event notified (see enum AudioTrack::event_type).
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* user: Pointer to context for use by the callback receiver.
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* info: Pointer to optional parameter according to event type:
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* - EVENT_MORE_DATA: pointer to AudioTrack::Buffer struct. The callback must not write
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* more bytes than indicated by 'size' field and update 'size' if less bytes are
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* written.
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* - EVENT_UNDERRUN: unused.
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* - EVENT_LOOP_END: pointer to an int indicating the number of loops remaining.
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* - EVENT_MARKER: pointer to an uin32_t containing the marker position in frames.
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* - EVENT_NEW_POS: pointer to an uin32_t containing the new position in frames.
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* - EVENT_BUFFER_END: unused.
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*/
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typedef void (*callback_t)(int event, void* user, void *info);
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/* Returns the minimum frame count required for the successful creation of
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* an AudioTrack object.
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* Returned status (from utils/Errors.h) can be:
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* - NO_ERROR: successful operation
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* - NO_INIT: audio server or audio hardware not initialized
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*/
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static status_t getMinFrameCount(int* frameCount,
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int streamType =-1,
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uint32_t sampleRate = 0);
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/* Constructs an uninitialized AudioTrack. No connection with
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* AudioFlinger takes place.
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*/
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AudioTrack();
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/* Creates an audio track and registers it with AudioFlinger.
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* Once created, the track needs to be started before it can be used.
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* Unspecified values are set to the audio hardware's current
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* values.
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*
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* Parameters:
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*
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* streamType: Select the type of audio stream this track is attached to
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* (e.g. AudioSystem::MUSIC).
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* sampleRate: Track sampling rate in Hz.
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* format: Audio format (e.g AudioSystem::PCM_16_BIT for signed
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* 16 bits per sample).
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* channels: Channel mask: see AudioSystem::audio_channels.
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* frameCount: Total size of track PCM buffer in frames. This defines the
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* latency of the track.
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* flags: Reserved for future use.
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* cbf: Callback function. If not null, this function is called periodically
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* to request new PCM data.
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* notificationFrames: The callback function is called each time notificationFrames PCM
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* frames have been comsumed from track input buffer.
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* user Context for use by the callback receiver.
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*/
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AudioTrack( int streamType,
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uint32_t sampleRate = 0,
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int format = 0,
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int channels = 0,
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int frameCount = 0,
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uint32_t flags = 0,
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callback_t cbf = 0,
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void* user = 0,
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int notificationFrames = 0,
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int sessionId = 0);
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/* Creates an audio track and registers it with AudioFlinger. With this constructor,
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* The PCM data to be rendered by AudioTrack is passed in a shared memory buffer
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* identified by the argument sharedBuffer. This prototype is for static buffer playback.
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* PCM data must be present into memory before the AudioTrack is started.
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* The Write() and Flush() methods are not supported in this case.
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* It is recommented to pass a callback function to be notified of playback end by an
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* EVENT_UNDERRUN event.
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*/
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AudioTrack( int streamType,
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uint32_t sampleRate = 0,
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int format = 0,
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int channels = 0,
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const sp<IMemory>& sharedBuffer = 0,
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uint32_t flags = 0,
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callback_t cbf = 0,
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void* user = 0,
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int notificationFrames = 0,
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int sessionId = 0);
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/* Creates an audio track and registers it with AudioFlinger. With this constructor,
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* session ID of compressed stream can be registered AudioFlinger and AudioHardware,
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* for routing purpose.
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*/
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AudioTrack( int streamType,
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uint32_t sampleRate = 0,
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int format = 0,
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int channels = 0,
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uint32_t flags = 0,
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int sessionId = 0,
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int lpaSessionId =-1);
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/* Terminates the AudioTrack and unregisters it from AudioFlinger.
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* Also destroys all resources assotiated with the AudioTrack.
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*/
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~AudioTrack();
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/* Initialize an uninitialized AudioTrack.
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* Returned status (from utils/Errors.h) can be:
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* - NO_ERROR: successful intialization
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* - INVALID_OPERATION: AudioTrack is already intitialized
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* - BAD_VALUE: invalid parameter (channels, format, sampleRate...)
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* - NO_INIT: audio server or audio hardware not initialized
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* */
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status_t set(int streamType =-1,
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uint32_t sampleRate = 0,
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int format = 0,
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int channels = 0,
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int frameCount = 0,
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uint32_t flags = 0,
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callback_t cbf = 0,
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void* user = 0,
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int notificationFrames = 0,
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const sp<IMemory>& sharedBuffer = 0,
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bool threadCanCallJava = false,
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int sessionId = 0);
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/* Initialize an AudioTrack and registers session Id for Tunneled audio decoding.
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* Returned status (from utils/Errors.h) can be:
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* - NO_ERROR: successful intialization
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* - INVALID_OPERATION: AudioTrack is already intitialized
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* - BAD_VALUE: invalid parameter (channels, format, sampleRate...)
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* - NO_INIT: audio server or audio hardware not initialized
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* */
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status_t set(int streamType =-1,
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uint32_t sampleRate = 0,
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int format = 0,
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int channels = 0,
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uint32_t flags = 0,
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int sessionId = 0,
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int lpaSessionId =-1);
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/* Result of constructing the AudioTrack. This must be checked
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* before using any AudioTrack API (except for set()), using
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* an uninitialized AudioTrack produces undefined results.
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* See set() method above for possible return codes.
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*/
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status_t initCheck() const;
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/* Returns this track's latency in milliseconds.
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* This includes the latency due to AudioTrack buffer size, AudioMixer (if any)
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* and audio hardware driver.
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*/
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uint32_t latency() const;
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/* getters, see constructor */
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int streamType() const;
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int format() const;
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int channelCount() const;
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uint32_t frameCount() const;
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int frameSize() const;
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sp<IMemory>& sharedBuffer();
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/* After it's created the track is not active. Call start() to
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* make it active. If set, the callback will start being called.
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*/
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void start();
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/* Stop a track. If set, the callback will cease being called and
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* obtainBuffer returns STOPPED. Note that obtainBuffer() still works
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* and will fill up buffers until the pool is exhausted.
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*/
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void stop();
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bool stopped() const;
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/* flush a stopped track. All pending buffers are discarded.
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* This function has no effect if the track is not stoped.
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*/
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void flush();
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/* Pause a track. If set, the callback will cease being called and
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* obtainBuffer returns STOPPED. Note that obtainBuffer() still works
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* and will fill up buffers until the pool is exhausted.
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*/
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void pause();
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/* mute or unmutes this track.
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* While mutted, the callback, if set, is still called.
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*/
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void mute(bool);
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bool muted() const;
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/* set volume for this track, mostly used for games' sound effects
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* left and right volumes. Levels must be <= 1.0.
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*/
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status_t setVolume(float left, float right);
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void getVolume(float* left, float* right);
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/* set the send level for this track. An auxiliary effect should be attached
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* to the track with attachEffect(). Level must be <= 1.0.
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*/
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status_t setAuxEffectSendLevel(float level);
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void getAuxEffectSendLevel(float* level);
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/* set sample rate for this track, mostly used for games' sound effects
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*/
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status_t setSampleRate(int sampleRate);
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uint32_t getSampleRate();
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/* Enables looping and sets the start and end points of looping.
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*
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* Parameters:
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*
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* loopStart: loop start expressed as the number of PCM frames played since AudioTrack start.
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* loopEnd: loop end expressed as the number of PCM frames played since AudioTrack start.
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* loopCount: number of loops to execute. Calling setLoop() with loopCount == 0 cancels any pending or
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* active loop. loopCount = -1 means infinite looping.
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*
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* For proper operation the following condition must be respected:
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* (loopEnd-loopStart) <= framecount()
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*/
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status_t setLoop(uint32_t loopStart, uint32_t loopEnd, int loopCount);
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status_t getLoop(uint32_t *loopStart, uint32_t *loopEnd, int *loopCount);
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/* Sets marker position. When playback reaches the number of frames specified, a callback with event
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* type EVENT_MARKER is called. Calling setMarkerPosition with marker == 0 cancels marker notification
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* callback.
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* If the AudioTrack has been opened with no callback function associated, the operation will fail.
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*
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* Parameters:
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*
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* marker: marker position expressed in frames.
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*
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* Returned status (from utils/Errors.h) can be:
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* - NO_ERROR: successful operation
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* - INVALID_OPERATION: the AudioTrack has no callback installed.
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*/
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status_t setMarkerPosition(uint32_t marker);
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status_t getMarkerPosition(uint32_t *marker);
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/* Sets position update period. Every time the number of frames specified has been played,
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* a callback with event type EVENT_NEW_POS is called.
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* Calling setPositionUpdatePeriod with updatePeriod == 0 cancels new position notification
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* callback.
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* If the AudioTrack has been opened with no callback function associated, the operation will fail.
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*
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* Parameters:
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*
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* updatePeriod: position update notification period expressed in frames.
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*
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* Returned status (from utils/Errors.h) can be:
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* - NO_ERROR: successful operation
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* - INVALID_OPERATION: the AudioTrack has no callback installed.
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*/
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status_t setPositionUpdatePeriod(uint32_t updatePeriod);
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status_t getPositionUpdatePeriod(uint32_t *updatePeriod);
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/* Sets playback head position within AudioTrack buffer. The new position is specified
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* in number of frames.
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* This method must be called with the AudioTrack in paused or stopped state.
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* Note that the actual position set is <position> modulo the AudioTrack buffer size in frames.
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* Therefore using this method makes sense only when playing a "static" audio buffer
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* as opposed to streaming.
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* The getPosition() method on the other hand returns the total number of frames played since
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* playback start.
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*
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* Parameters:
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*
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* position: New playback head position within AudioTrack buffer.
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*
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* Returned status (from utils/Errors.h) can be:
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* - NO_ERROR: successful operation
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* - INVALID_OPERATION: the AudioTrack is not stopped.
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* - BAD_VALUE: The specified position is beyond the number of frames present in AudioTrack buffer
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*/
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status_t setPosition(uint32_t position);
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status_t getPosition(uint32_t *position);
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/* Forces AudioTrack buffer full condition. When playing a static buffer, this method avoids
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* rewriting the buffer before restarting playback after a stop.
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* This method must be called with the AudioTrack in paused or stopped state.
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||
|
|
*
|
||
|
|
* Returned status (from utils/Errors.h) can be:
|
||
|
|
* - NO_ERROR: successful operation
|
||
|
|
* - INVALID_OPERATION: the AudioTrack is not stopped.
|
||
|
|
*/
|
||
|
|
status_t reload();
|
||
|
|
|
||
|
|
/* returns a handle on the audio output used by this AudioTrack.
|
||
|
|
*
|
||
|
|
* Parameters:
|
||
|
|
* none.
|
||
|
|
*
|
||
|
|
* Returned value:
|
||
|
|
* handle on audio hardware output
|
||
|
|
*/
|
||
|
|
audio_io_handle_t getOutput();
|
||
|
|
|
||
|
|
/* returns the unique ID associated to this track.
|
||
|
|
*
|
||
|
|
* Parameters:
|
||
|
|
* none.
|
||
|
|
*
|
||
|
|
* Returned value:
|
||
|
|
* AudioTrack ID.
|
||
|
|
*/
|
||
|
|
int getSessionId();
|
||
|
|
|
||
|
|
|
||
|
|
/* Attach track auxiliary output to specified effect. Used effectId = 0
|
||
|
|
* to detach track from effect.
|
||
|
|
*
|
||
|
|
* Parameters:
|
||
|
|
*
|
||
|
|
* effectId: effectId obtained from AudioEffect::id().
|
||
|
|
*
|
||
|
|
* Returned status (from utils/Errors.h) can be:
|
||
|
|
* - NO_ERROR: successful operation
|
||
|
|
* - INVALID_OPERATION: the effect is not an auxiliary effect.
|
||
|
|
* - BAD_VALUE: The specified effect ID is invalid
|
||
|
|
*/
|
||
|
|
status_t attachAuxEffect(int effectId);
|
||
|
|
|
||
|
|
/* obtains a buffer of "frameCount" frames. The buffer must be
|
||
|
|
* filled entirely. If the track is stopped, obtainBuffer() returns
|
||
|
|
* STOPPED instead of NO_ERROR as long as there are buffers availlable,
|
||
|
|
* at which point NO_MORE_BUFFERS is returned.
|
||
|
|
* Buffers will be returned until the pool (buffercount())
|
||
|
|
* is exhausted, at which point obtainBuffer() will either block
|
||
|
|
* or return WOULD_BLOCK depending on the value of the "blocking"
|
||
|
|
* parameter.
|
||
|
|
*/
|
||
|
|
|
||
|
|
enum {
|
||
|
|
NO_MORE_BUFFERS = 0x80000001,
|
||
|
|
STOPPED = 1
|
||
|
|
};
|
||
|
|
|
||
|
|
status_t obtainBuffer(Buffer* audioBuffer, int32_t waitCount);
|
||
|
|
void releaseBuffer(Buffer* audioBuffer);
|
||
|
|
|
||
|
|
|
||
|
|
/* As a convenience we provide a write() interface to the audio buffer.
|
||
|
|
* This is implemented on top of lockBuffer/unlockBuffer. For best
|
||
|
|
* performance
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
ssize_t write(const void* buffer, size_t size);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Dumps the state of an audio track.
|
||
|
|
*/
|
||
|
|
status_t dump(int fd, const Vector<String16>& args) const;
|
||
|
|
|
||
|
|
private:
|
||
|
|
/* copying audio tracks is not allowed */
|
||
|
|
AudioTrack(const AudioTrack& other);
|
||
|
|
AudioTrack& operator = (const AudioTrack& other);
|
||
|
|
|
||
|
|
/* a small internal class to handle the callback */
|
||
|
|
class AudioTrackThread : public Thread
|
||
|
|
{
|
||
|
|
public:
|
||
|
|
AudioTrackThread(AudioTrack& receiver, bool bCanCallJava = false);
|
||
|
|
private:
|
||
|
|
friend class AudioTrack;
|
||
|
|
virtual bool threadLoop();
|
||
|
|
virtual status_t readyToRun();
|
||
|
|
virtual void onFirstRef();
|
||
|
|
AudioTrack& mReceiver;
|
||
|
|
Mutex mLock;
|
||
|
|
};
|
||
|
|
|
||
|
|
bool processAudioBuffer(const sp<AudioTrackThread>& thread);
|
||
|
|
status_t createTrack(int streamType,
|
||
|
|
uint32_t sampleRate,
|
||
|
|
int format,
|
||
|
|
int channelCount,
|
||
|
|
int frameCount,
|
||
|
|
uint32_t flags,
|
||
|
|
const sp<IMemory>& sharedBuffer,
|
||
|
|
audio_io_handle_t output,
|
||
|
|
bool enforceFrameCount);
|
||
|
|
|
||
|
|
sp<IAudioTrack> mAudioTrack;
|
||
|
|
sp<IMemory> mCblkMemory;
|
||
|
|
sp<AudioTrackThread> mAudioTrackThread;
|
||
|
|
|
||
|
|
float mVolume[2];
|
||
|
|
float mSendLevel;
|
||
|
|
uint32_t mFrameCount;
|
||
|
|
|
||
|
|
audio_track_cblk_t* mCblk;
|
||
|
|
uint8_t mStreamType;
|
||
|
|
uint8_t mFormat;
|
||
|
|
uint8_t mChannelCount;
|
||
|
|
uint8_t mMuted;
|
||
|
|
uint32_t mChannels;
|
||
|
|
status_t mStatus;
|
||
|
|
uint32_t mLatency;
|
||
|
|
|
||
|
|
volatile int32_t mActive;
|
||
|
|
|
||
|
|
callback_t mCbf;
|
||
|
|
void* mUserData;
|
||
|
|
uint32_t mNotificationFramesReq; // requested number of frames between each notification callback
|
||
|
|
uint32_t mNotificationFramesAct; // actual number of frames between each notification callback
|
||
|
|
sp<IMemory> mSharedBuffer;
|
||
|
|
int mLoopCount;
|
||
|
|
uint32_t mRemainingFrames;
|
||
|
|
uint32_t mMarkerPosition;
|
||
|
|
bool mMarkerReached;
|
||
|
|
uint32_t mNewPosition;
|
||
|
|
uint32_t mUpdatePeriod;
|
||
|
|
uint32_t mFlags;
|
||
|
|
audio_io_handle_t mAudioSession;
|
||
|
|
int mSessionId;
|
||
|
|
int mAuxEffectId;
|
||
|
|
};
|
||
|
|
|
||
|
|
|
||
|
|
}; // namespace android
|
||
|
|
|
||
|
|
#endif // ANDROID_AUDIOTRACK_H
|