AudioSystem.h revision b7f24b101d43139b4c747129bfbc4ecf5c468b86 
1/*
2 * Copyright (C) 2008 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#ifndef ANDROID_AUDIOSYSTEM_H_
18#define ANDROID_AUDIOSYSTEM_H_
19
20#include <hardware/audio_effect.h>
21#include <media/IAudioFlingerClient.h>
22#include <media/IAudioPolicyServiceClient.h>
23#include <system/audio.h>
24#include <system/audio_policy.h>
25#include <utils/Errors.h>
26#include <utils/Mutex.h>
27
28namespace android {
29
30typedef void (*audio_error_callback)(status_t err);
31
32class IAudioFlinger;
33class IAudioPolicyService;
34class String8;
35
36class AudioSystem
37{
38public:
39
40    /* These are static methods to control the system-wide AudioFlinger
41     * only privileged processes can have access to them
42     */
43
44    // mute/unmute microphone
45    static status_t muteMicrophone(bool state);
46    static status_t isMicrophoneMuted(bool *state);
47
48    // set/get master volume
49    static status_t setMasterVolume(float value);
50    static status_t getMasterVolume(float* volume);
51
52    // mute/unmute audio outputs
53    static status_t setMasterMute(bool mute);
54    static status_t getMasterMute(bool* mute);
55
56    // set/get stream volume on specified output
57    static status_t setStreamVolume(audio_stream_type_t stream, float value,
58                                    audio_io_handle_t output);
59    static status_t getStreamVolume(audio_stream_type_t stream, float* volume,
60                                    audio_io_handle_t output);
61
62    // mute/unmute stream
63    static status_t setStreamMute(audio_stream_type_t stream, bool mute);
64    static status_t getStreamMute(audio_stream_type_t stream, bool* mute);
65
66    // set audio mode in audio hardware
67    static status_t setMode(audio_mode_t mode);
68
69    // returns true in *state if tracks are active on the specified stream or have been active
70    // in the past inPastMs milliseconds
71    static status_t isStreamActive(audio_stream_type_t stream, bool *state, uint32_t inPastMs);
72    // returns true in *state if tracks are active for what qualifies as remote playback
73    // on the specified stream or have been active in the past inPastMs milliseconds. Remote
74    // playback isn't mutually exclusive with local playback.
75    static status_t isStreamActiveRemotely(audio_stream_type_t stream, bool *state,
76            uint32_t inPastMs);
77    // returns true in *state if a recorder is currently recording with the specified source
78    static status_t isSourceActive(audio_source_t source, bool *state);
79
80    // set/get audio hardware parameters. The function accepts a list of parameters
81    // key value pairs in the form: key1=value1;key2=value2;...
82    // Some keys are reserved for standard parameters (See AudioParameter class).
83    // The versions with audio_io_handle_t are intended for internal media framework use only.
84    static status_t setParameters(audio_io_handle_t ioHandle, const String8& keyValuePairs);
85    static String8  getParameters(audio_io_handle_t ioHandle, const String8& keys);
86    // The versions without audio_io_handle_t are intended for JNI.
87    static status_t setParameters(const String8& keyValuePairs);
88    static String8  getParameters(const String8& keys);
89
90    static void setErrorCallback(audio_error_callback cb);
91
92    // helper function to obtain AudioFlinger service handle
93    static const sp<IAudioFlinger>& get_audio_flinger();
94
95    static float linearToLog(int volume);
96    static int logToLinear(float volume);
97
98    // Returned samplingRate and frameCount output values are guaranteed
99    // to be non-zero if status == NO_ERROR
100    static status_t getOutputSamplingRate(uint32_t* samplingRate,
101            audio_stream_type_t stream);
102    static status_t getOutputFrameCount(size_t* frameCount,
103            audio_stream_type_t stream);
104    static status_t getOutputLatency(uint32_t* latency,
105            audio_stream_type_t stream);
106    static status_t getSamplingRate(audio_io_handle_t output,
107                                          uint32_t* samplingRate);
108    // returns the number of frames per audio HAL write buffer. Corresponds to
109    // audio_stream->get_buffer_size()/audio_stream_frame_size()
110    static status_t getFrameCount(audio_io_handle_t output,
111                                  size_t* frameCount);
112    // returns the audio output stream latency in ms. Corresponds to
113    // audio_stream_out->get_latency()
114    static status_t getLatency(audio_io_handle_t output,
115                               uint32_t* latency);
116
117    static bool routedToA2dpOutput(audio_stream_type_t streamType);
118
119    // return status NO_ERROR implies *buffSize > 0
120    static status_t getInputBufferSize(uint32_t sampleRate, audio_format_t format,
121        audio_channel_mask_t channelMask, size_t* buffSize);
122
123    static status_t setVoiceVolume(float volume);
124
125    // return the number of audio frames written by AudioFlinger to audio HAL and
126    // audio dsp to DAC since the specified output I/O handle has exited standby.
127    // returned status (from utils/Errors.h) can be:
128    // - NO_ERROR: successful operation, halFrames and dspFrames point to valid data
129    // - INVALID_OPERATION: Not supported on current hardware platform
130    // - BAD_VALUE: invalid parameter
131    // NOTE: this feature is not supported on all hardware platforms and it is
132    // necessary to check returned status before using the returned values.
133    static status_t getRenderPosition(audio_io_handle_t output,
134                                      uint32_t *halFrames,
135                                      uint32_t *dspFrames);
136
137    // return the number of input frames lost by HAL implementation, or 0 if the handle is invalid
138    static uint32_t getInputFramesLost(audio_io_handle_t ioHandle);
139
140    // Allocate a new audio session ID and return that new ID.
141    // If unable to contact AudioFlinger, returns AUDIO_SESSION_ALLOCATE instead.
142    // FIXME If AudioFlinger were to ever exhaust the session ID namespace,
143    //       this method could fail by returning either AUDIO_SESSION_ALLOCATE
144    //       or an unspecified existing session ID.
145    static int newAudioSessionId();
146
147    static void acquireAudioSessionId(int audioSession, pid_t pid);
148    static void releaseAudioSessionId(int audioSession, pid_t pid);
149
150    // types of io configuration change events received with ioConfigChanged()
151    enum io_config_event {
152        OUTPUT_OPENED,
153        OUTPUT_CLOSED,
154        OUTPUT_CONFIG_CHANGED,
155        INPUT_OPENED,
156        INPUT_CLOSED,
157        INPUT_CONFIG_CHANGED,
158        STREAM_CONFIG_CHANGED,
159        NUM_CONFIG_EVENTS
160    };
161
162    // audio output descriptor used to cache output configurations in client process to avoid
163    // frequent calls through IAudioFlinger
164    class OutputDescriptor {
165    public:
166        OutputDescriptor()
167        : samplingRate(0), format(AUDIO_FORMAT_DEFAULT), channelMask(0), frameCount(0), latency(0)
168            {}
169
170        uint32_t samplingRate;
171        audio_format_t format;
172        audio_channel_mask_t channelMask;
173        size_t frameCount;
174        uint32_t latency;
175    };
176
177    // Events used to synchronize actions between audio sessions.
178    // For instance SYNC_EVENT_PRESENTATION_COMPLETE can be used to delay recording start until
179    // playback is complete on another audio session.
180    // See definitions in MediaSyncEvent.java
181    enum sync_event_t {
182        SYNC_EVENT_SAME = -1,             // used internally to indicate restart with same event
183        SYNC_EVENT_NONE = 0,
184        SYNC_EVENT_PRESENTATION_COMPLETE,
185
186        //
187        // Define new events here: SYNC_EVENT_START, SYNC_EVENT_STOP, SYNC_EVENT_TIME ...
188        //
189        SYNC_EVENT_CNT,
190    };
191
192    // Timeout for synchronous record start. Prevents from blocking the record thread forever
193    // if the trigger event is not fired.
194    static const uint32_t kSyncRecordStartTimeOutMs = 30000;
195
196    //
197    // IAudioPolicyService interface (see AudioPolicyInterface for method descriptions)
198    //
199    static status_t setDeviceConnectionState(audio_devices_t device, audio_policy_dev_state_t state,
200                                                const char *device_address);
201    static audio_policy_dev_state_t getDeviceConnectionState(audio_devices_t device,
202                                                                const char *device_address);
203    static status_t setPhoneState(audio_mode_t state);
204    static status_t setForceUse(audio_policy_force_use_t usage, audio_policy_forced_cfg_t config);
205    static audio_policy_forced_cfg_t getForceUse(audio_policy_force_use_t usage);
206
207    // Client must successfully hand off the handle reference to AudioFlinger via createTrack(),
208    // or release it with releaseOutput().
209    static audio_io_handle_t getOutput(audio_stream_type_t stream,
210                                        uint32_t samplingRate = 0,
211                                        audio_format_t format = AUDIO_FORMAT_DEFAULT,
212                                        audio_channel_mask_t channelMask = AUDIO_CHANNEL_OUT_STEREO,
213                                        audio_output_flags_t flags = AUDIO_OUTPUT_FLAG_NONE,
214                                        const audio_offload_info_t *offloadInfo = NULL);
215
216    static status_t startOutput(audio_io_handle_t output,
217                                audio_stream_type_t stream,
218                                int session);
219    static status_t stopOutput(audio_io_handle_t output,
220                               audio_stream_type_t stream,
221                               int session);
222    static void releaseOutput(audio_io_handle_t output);
223
224    // Client must successfully hand off the handle reference to AudioFlinger via openRecord(),
225    // or release it with releaseInput().
226    static audio_io_handle_t getInput(audio_source_t inputSource,
227                                    uint32_t samplingRate,
228                                    audio_format_t format,
229                                    audio_channel_mask_t channelMask,
230                                    int sessionId);
231
232    static status_t startInput(audio_io_handle_t input);
233    static status_t stopInput(audio_io_handle_t input);
234    static void releaseInput(audio_io_handle_t input);
235    static status_t initStreamVolume(audio_stream_type_t stream,
236                                      int indexMin,
237                                      int indexMax);
238    static status_t setStreamVolumeIndex(audio_stream_type_t stream,
239                                         int index,
240                                         audio_devices_t device);
241    static status_t getStreamVolumeIndex(audio_stream_type_t stream,
242                                         int *index,
243                                         audio_devices_t device);
244
245    static uint32_t getStrategyForStream(audio_stream_type_t stream);
246    static audio_devices_t getDevicesForStream(audio_stream_type_t stream);
247
248    static audio_io_handle_t getOutputForEffect(const effect_descriptor_t *desc);
249    static status_t registerEffect(const effect_descriptor_t *desc,
250                                    audio_io_handle_t io,
251                                    uint32_t strategy,
252                                    int session,
253                                    int id);
254    static status_t unregisterEffect(int id);
255    static status_t setEffectEnabled(int id, bool enabled);
256
257    // clear stream to output mapping cache (gStreamOutputMap)
258    // and output configuration cache (gOutputs)
259    static void clearAudioConfigCache();
260
261    static const sp<IAudioPolicyService>& get_audio_policy_service();
262
263    // helpers for android.media.AudioManager.getProperty(), see description there for meaning
264    static uint32_t getPrimaryOutputSamplingRate();
265    static size_t getPrimaryOutputFrameCount();
266
267    static status_t setLowRamDevice(bool isLowRamDevice);
268
269    // Check if hw offload is possible for given format, stream type, sample rate,
270    // bit rate, duration, video and streaming or offload property is enabled
271    static bool isOffloadSupported(const audio_offload_info_t& info);
272
273    // check presence of audio flinger service.
274    // returns NO_ERROR if binding to service succeeds, DEAD_OBJECT otherwise
275    static status_t checkAudioFlinger();
276
277    /* List available audio ports and their attributes */
278    static status_t listAudioPorts(audio_port_role_t role,
279                                   audio_port_type_t type,
280                                   unsigned int *num_ports,
281                                   struct audio_port *ports,
282                                   unsigned int *generation);
283
284    /* Get attributes for a given audio port */
285    static status_t getAudioPort(struct audio_port *port);
286
287    /* Create an audio patch between several source and sink ports */
288    static status_t createAudioPatch(const struct audio_patch *patch,
289                                       audio_patch_handle_t *handle);
290
291    /* Release an audio patch */
292    static status_t releaseAudioPatch(audio_patch_handle_t handle);
293
294    /* List existing audio patches */
295    static status_t listAudioPatches(unsigned int *num_patches,
296                                      struct audio_patch *patches,
297                                      unsigned int *generation);
298    /* Set audio port configuration */
299    static status_t setAudioPortConfig(const struct audio_port_config *config);
300
301    // ----------------------------------------------------------------------------
302
303    class AudioPortCallback : public RefBase
304    {
305    public:
306
307                AudioPortCallback() {}
308        virtual ~AudioPortCallback() {}
309
310        virtual void onAudioPortListUpdate() = 0;
311        virtual void onAudioPatchListUpdate() = 0;
312        virtual void onServiceDied() = 0;
313
314    };
315
316    static void setAudioPortCallback(sp<AudioPortCallback> callBack);
317
318private:
319
320    class AudioFlingerClient: public IBinder::DeathRecipient, public BnAudioFlingerClient
321    {
322    public:
323        AudioFlingerClient() {
324        }
325
326        // DeathRecipient
327        virtual void binderDied(const wp<IBinder>& who);
328
329        // IAudioFlingerClient
330
331        // indicate a change in the configuration of an output or input: keeps the cached
332        // values for output/input parameters up-to-date in client process
333        virtual void ioConfigChanged(int event, audio_io_handle_t ioHandle, const void *param2);
334    };
335
336    class AudioPolicyServiceClient: public IBinder::DeathRecipient,
337                                    public BnAudioPolicyServiceClient
338    {
339    public:
340        AudioPolicyServiceClient() {
341        }
342
343        // DeathRecipient
344        virtual void binderDied(const wp<IBinder>& who);
345
346        // IAudioPolicyServiceClient
347        virtual void onAudioPortListUpdate();
348        virtual void onAudioPatchListUpdate();
349    };
350
351    static sp<AudioFlingerClient> gAudioFlingerClient;
352    static sp<AudioPolicyServiceClient> gAudioPolicyServiceClient;
353    friend class AudioFlingerClient;
354    friend class AudioPolicyServiceClient;
355
356    static Mutex gLock;
357    static sp<IAudioFlinger> gAudioFlinger;
358    static audio_error_callback gAudioErrorCallback;
359
360    static size_t gInBuffSize;
361    // previous parameters for recording buffer size queries
362    static uint32_t gPrevInSamplingRate;
363    static audio_format_t gPrevInFormat;
364    static audio_channel_mask_t gPrevInChannelMask;
365
366    static sp<IAudioPolicyService> gAudioPolicyService;
367
368    // list of output descriptors containing cached parameters
369    // (sampling rate, framecount, channel count...)
370    static DefaultKeyedVector<audio_io_handle_t, OutputDescriptor *> gOutputs;
371
372    static sp<AudioPortCallback> gAudioPortCallback;
373};
374
375};  // namespace android
376
377#endif  /*ANDROID_AUDIOSYSTEM_H_*/
378