summaryrefslogtreecommitdiffstats
path: root/include/media/AudioRecord.h
blob: 6aa40d008eba81f7b06a6fd8cffa984aa06b2b17 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
/*
 * Copyright (C) 2008 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 AUDIORECORD_H_
#define AUDIORECORD_H_

#include <stdint.h>
#include <sys/types.h>

#include <media/IAudioFlinger.h>
#include <media/IAudioRecord.h>
#include <media/AudioTrack.h>

#include <utils/RefBase.h>
#include <utils/Errors.h>
#include <utils/IInterface.h>
#include <utils/IMemory.h>
#include <utils/threads.h>


namespace android {

// ----------------------------------------------------------------------------

class AudioRecord
{
public:

    enum stream_type {
        DEFAULT_INPUT   =-1,
        MIC_INPUT       = 0,
        NUM_STREAM_TYPES
    };

    static const int DEFAULT_SAMPLE_RATE = 8000;

    /* Events used by AudioRecord callback function (callback_t).
     * 
     * to keep in sync with frameworks/base/media/java/android/media/AudioRecord.java
     */
    enum event_type {
        EVENT_MORE_DATA = 0,        // Request to reqd more data from PCM buffer.
        EVENT_OVERRUN = 1,          // PCM buffer overrun occured.
        EVENT_MARKER = 2,           // Record head is at the specified marker position
                                    // (See setMarkerPosition()).
        EVENT_NEW_POS = 3,          // Record head is at a new position 
                                    // (See setPositionUpdatePeriod()).
    };

    /* Create Buffer on the stack and pass it to obtainBuffer()
     * and releaseBuffer().
     */

    class Buffer
    {
    public:
        enum {
            MUTE    = 0x00000001
        };
        uint32_t    flags;
        int         channelCount;
        int         format;
        size_t      frameCount;
        size_t      size;
        union {
            void*       raw;
            short*      i16;
            int8_t*     i8;
        };
    };

    /* These are static methods to control the system-wide AudioFlinger
     * only privileged processes can have access to them
     */

//    static status_t setMasterMute(bool mute);

    /* As a convenience, if a callback is supplied, a handler thread
     * is automatically created with the appropriate priority. This thread
     * invokes the callback when a new buffer becomes ready or an overrun condition occurs.
     * Parameters:
     *
     * event:   type of event notified (see enum AudioRecord::event_type).
     * user:    Pointer to context for use by the callback receiver.
     * info:    Pointer to optional parameter according to event type:
     *          - EVENT_MORE_DATA: pointer to AudioRecord::Buffer struct. The callback must not read
     *          more bytes than indicated by 'size' field and update 'size' if less bytes are
     *          read.
     *          - EVENT_OVERRUN: unused.
     *          - EVENT_MARKER: pointer to an uin32_t containing the marker position in frames.
     *          - EVENT_NEW_POS: pointer to an uin32_t containing the new position in frames.
     */

    typedef void (*callback_t)(int event, void* user, void *info);

    /* Constructs an uninitialized AudioRecord. No connection with
     * AudioFlinger takes place.
     */
                        AudioRecord();

    /* Creates an AudioRecord track and registers it with AudioFlinger.
     * Once created, the track needs to be started before it can be used.
     * Unspecified values are set to the audio hardware's current
     * values.
     *
     * Parameters:
     *
     * streamType:         Select the audio input to record to (e.g. AudioRecord::MIC_INPUT).
     * sampleRate:         Track sampling rate in Hz.
     * format:             PCM sample format (e.g AudioSystem::PCM_16_BIT for signed
     *                     16 bits per sample).
     * channelCount:       Number of PCM channels (e.g 2 for stereo).
     * frameCount:         Total size of track PCM buffer in frames. This defines the
     *                     latency of the track.
     * flags:              A bitmask of acoustic values from enum record_flags.  It enables
     *                     AGC, NS, and IIR.
     * cbf:                Callback function. If not null, this function is called periodically
     *                     to provide new PCM data.
     * notificationFrames: The callback function is called each time notificationFrames PCM
     *                     frames are ready in record track output buffer.
     * user                Context for use by the callback receiver.
     */

     enum record_flags {
         RECORD_AGC_ENABLE = AudioSystem::AGC_ENABLE,
         RECORD_NS_ENABLE  = AudioSystem::NS_ENABLE,
         RECORD_IIR_ENABLE = AudioSystem::TX_IIR_ENABLE
     };

                        AudioRecord(int streamType,
                                    uint32_t sampleRate = 0,
                                    int format          = 0,
                                    int channelCount    = 0,
                                    int frameCount      = 0,
                                    uint32_t flags      = 0,
                                    callback_t cbf = 0,
                                    void* user = 0,
                                    int notificationFrames = 0);


    /* Terminates the AudioRecord and unregisters it from AudioFlinger.
     * Also destroys all resources assotiated with the AudioRecord.
     */
                        ~AudioRecord();


    /* Initialize an uninitialized AudioRecord.
     * Returned status (from utils/Errors.h) can be:
     *  - NO_ERROR: successful intialization
     *  - INVALID_OPERATION: AudioRecord is already intitialized or record device is already in use
     *  - BAD_VALUE: invalid parameter (channelCount, format, sampleRate...)
     *  - NO_INIT: audio server or audio hardware not initialized
     *  - PERMISSION_DENIED: recording is not allowed for the requesting process
     * */
            status_t    set(int streamType      = 0,
                            uint32_t sampleRate = 0,
                            int format          = 0,
                            int channelCount    = 0,
                            int frameCount      = 0,
                            uint32_t flags      = 0,
                            callback_t cbf = 0,
                            void* user = 0,
                            int notificationFrames = 0,
                            bool threadCanCallJava = false);


    /* Result of constructing the AudioRecord. This must be checked
     * before using any AudioRecord API (except for set()), using
     * an uninitialized AudioRecord produces undefined results.
     * See set() method above for possible return codes.
     */
            status_t    initCheck() const;

    /* Returns this track's latency in milliseconds.
     * This includes the latency due to AudioRecord buffer size
     * and audio hardware driver.
     */
            uint32_t     latency() const;

   /* getters, see constructor */

            uint32_t    sampleRate() const;
            int         format() const;
            int         channelCount() const;
            uint32_t    frameCount() const;
            int         frameSize() const;


    /* After it's created the track is not active. Call start() to
     * make it active. If set, the callback will start being called.
     */
            status_t    start();

    /* Stop a track. If set, the callback will cease being called and
     * obtainBuffer returns STOPPED. Note that obtainBuffer() still works
     * and will fill up buffers until the pool is exhausted.
     */
            status_t    stop();
            bool        stopped() const;

    /* get sample rate for this track
     */
            uint32_t    getSampleRate();

    /* Sets marker position. When record reaches the number of frames specified,
     * a callback with event type EVENT_MARKER is called. Calling setMarkerPosition
     * with marker == 0 cancels marker notification callback. 
     * If the AudioRecord has been opened with no callback function associated, 
     * the operation will fail.
     *
     * Parameters:
     *
     * marker:   marker position expressed in frames.
     *
     * Returned status (from utils/Errors.h) can be:
     *  - NO_ERROR: successful operation
     *  - INVALID_OPERATION: the AudioRecord has no callback installed.
     */
            status_t    setMarkerPosition(uint32_t marker);
            status_t    getMarkerPosition(uint32_t *marker);


    /* Sets position update period. Every time the number of frames specified has been recorded, 
     * a callback with event type EVENT_NEW_POS is called. 
     * Calling setPositionUpdatePeriod with updatePeriod == 0 cancels new position notification 
     * callback. 
     * If the AudioRecord has been opened with no callback function associated,
     * the operation will fail.
     *
     * Parameters:
     *
     * updatePeriod:  position update notification period expressed in frames.
     *
     * Returned status (from utils/Errors.h) can be:
     *  - NO_ERROR: successful operation
     *  - INVALID_OPERATION: the AudioRecord has no callback installed.
     */
            status_t    setPositionUpdatePeriod(uint32_t updatePeriod);
            status_t    getPositionUpdatePeriod(uint32_t *updatePeriod);


    /* Gets record head position. The position is the  total number of frames 
     * recorded since record start. 
     *
     * Parameters:
     *
     *  position:  Address where to return record head position within AudioRecord buffer.
     *
     * Returned status (from utils/Errors.h) can be:
     *  - NO_ERROR: successful operation
     *  - BAD_VALUE:  position is NULL
     */
            status_t    getPosition(uint32_t *position);

            
            
    /* 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 read() interface to the audio buffer.
     * This is implemented on top of lockBuffer/unlockBuffer.
     */
            ssize_t     read(void* buffer, size_t size);

private:
    /* copying audio tracks is not allowed */
                        AudioRecord(const AudioRecord& other);
            AudioRecord& operator = (const AudioRecord& other);

    /* a small internal class to handle the callback */
    class ClientRecordThread : public Thread
    {
    public:
        ClientRecordThread(AudioRecord& receiver, bool bCanCallJava = false);
    private:
        friend class AudioRecord;
        virtual bool        threadLoop();
        virtual status_t    readyToRun() { return NO_ERROR; }
        virtual void        onFirstRef() {}
        AudioRecord& mReceiver;
        Mutex       mLock;
    };

            bool processAudioBuffer(const sp<ClientRecordThread>& thread);

    sp<IAudioRecord>        mAudioRecord;
    sp<IMemory>             mCblkMemory;
    sp<ClientRecordThread>  mClientRecordThread;
    Mutex                   mRecordThreadLock;

    uint32_t                mSampleRate;
    uint32_t                mFrameCount;

    audio_track_cblk_t*     mCblk;
    uint8_t                 mFormat;
    uint8_t                 mChannelCount;
    uint8_t                 mReserved[2];
    status_t                mStatus;
    uint32_t                mLatency;

    volatile int32_t        mActive;

    callback_t              mCbf;
    void*                   mUserData;
    uint32_t                mNotificationFrames;
    uint32_t                mRemainingFrames;
    uint32_t                mMarkerPosition;
    bool                    mMarkerReached;
    uint32_t                mNewPosition;
    uint32_t                mUpdatePeriod;
};

}; // namespace android

#endif /*AUDIORECORD_H_*/