Visualizer.cpp revision 83bc7f3cf78b28a818417f40a4f0c00593993366 
1/*
2**
3** Copyright 2010, The Android Open Source Project
4**
5** Licensed under the Apache License, Version 2.0 (the "License");
6** you may not use this file except in compliance with the License.
7** You may obtain a copy of the License at
8**
9**     http://www.apache.org/licenses/LICENSE-2.0
10**
11** Unless required by applicable law or agreed to in writing, software
12** distributed under the License is distributed on an "AS IS" BASIS,
13** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14** See the License for the specific language governing permissions and
15** limitations under the License.
16*/
17
18
19//#define LOG_NDEBUG 0
20#define LOG_TAG "Visualizer"
21#include <utils/Log.h>
22
23#include <stdint.h>
24#include <sys/types.h>
25#include <limits.h>
26
27#include <cutils/bitops.h>
28
29#include <media/Visualizer.h>
30
31extern void fixed_fft_real(int n, int32_t *v);
32
33namespace android {
34
35// ---------------------------------------------------------------------------
36
37Visualizer::Visualizer (int32_t priority,
38         effect_callback_t cbf,
39         void* user,
40         int sessionId)
41    :   AudioEffect(SL_IID_VISUALIZATION, NULL, priority, cbf, user, sessionId),
42        mCaptureRate(CAPTURE_RATE_DEF),
43        mCaptureSize(CAPTURE_SIZE_DEF),
44        mSampleRate(44100000),
45        mCaptureCallBack(NULL),
46        mCaptureCbkUser(NULL)
47{
48    initCaptureSize();
49}
50
51Visualizer::~Visualizer()
52{
53}
54
55status_t Visualizer::setEnabled(bool enabled)
56{
57    Mutex::Autolock _l(mLock);
58
59    sp<CaptureThread> t = mCaptureThread;
60    if (t != 0) {
61        if (enabled) {
62            if (t->exitPending()) {
63                if (t->requestExitAndWait() == WOULD_BLOCK) {
64                    ALOGE("Visualizer::enable() called from thread");
65                    return INVALID_OPERATION;
66                }
67            }
68        }
69        t->mLock.lock();
70     }
71
72    status_t status = AudioEffect::setEnabled(enabled);
73
74    if (status == NO_ERROR) {
75        if (t != 0) {
76            if (enabled) {
77                t->run("AudioTrackThread");
78            } else {
79                t->requestExit();
80            }
81        }
82    }
83
84    if (t != 0) {
85        t->mLock.unlock();
86    }
87
88    return status;
89}
90
91status_t Visualizer::setCaptureCallBack(capture_cbk_t cbk, void* user, uint32_t flags, uint32_t rate)
92{
93    if (rate > CAPTURE_RATE_MAX) {
94        return BAD_VALUE;
95    }
96    Mutex::Autolock _l(mLock);
97
98    if (mEnabled) {
99        return INVALID_OPERATION;
100    }
101
102    sp<CaptureThread> t = mCaptureThread;
103    if (t != 0) {
104        t->mLock.lock();
105    }
106    mCaptureThread.clear();
107    mCaptureCallBack = cbk;
108    mCaptureCbkUser = user;
109    mCaptureFlags = flags;
110    mCaptureRate = rate;
111
112    if (t != 0) {
113        t->mLock.unlock();
114    }
115
116    if (cbk != NULL) {
117        mCaptureThread = new CaptureThread(*this, rate, ((flags & CAPTURE_CALL_JAVA) != 0));
118    }
119    ALOGV("setCaptureCallBack() rate: %d thread %p flags 0x%08x",
120            rate, mCaptureThread.get(), mCaptureFlags);
121    return NO_ERROR;
122}
123
124status_t Visualizer::setCaptureSize(uint32_t size)
125{
126    if (size > VISUALIZER_CAPTURE_SIZE_MAX ||
127        size < VISUALIZER_CAPTURE_SIZE_MIN ||
128        popcount(size) != 1) {
129        return BAD_VALUE;
130    }
131
132    Mutex::Autolock _l(mLock);
133    if (mEnabled) {
134        return INVALID_OPERATION;
135    }
136
137    uint32_t buf32[sizeof(effect_param_t) / sizeof(uint32_t) + 2];
138    effect_param_t *p = (effect_param_t *)buf32;
139
140    p->psize = sizeof(uint32_t);
141    p->vsize = sizeof(uint32_t);
142    *(int32_t *)p->data = VISUALIZER_PARAM_CAPTURE_SIZE;
143    *((int32_t *)p->data + 1)= size;
144    status_t status = setParameter(p);
145
146    ALOGV("setCaptureSize size %d  status %d p->status %d", size, status, p->status);
147
148    if (status == NO_ERROR) {
149        status = p->status;
150    }
151    if (status == NO_ERROR) {
152        mCaptureSize = size;
153    }
154
155    return status;
156}
157
158status_t Visualizer::getWaveForm(uint8_t *waveform)
159{
160    if (waveform == NULL) {
161        return BAD_VALUE;
162    }
163    if (mCaptureSize == 0) {
164        return NO_INIT;
165    }
166
167    status_t status = NO_ERROR;
168    if (mEnabled) {
169        uint32_t replySize = mCaptureSize;
170        status = command(VISUALIZER_CMD_CAPTURE, 0, NULL, &replySize, waveform);
171        ALOGV("getWaveForm() command returned %d", status);
172        if (replySize == 0) {
173            status = NOT_ENOUGH_DATA;
174        }
175    } else {
176        ALOGV("getWaveForm() disabled");
177        memset(waveform, 0x80, mCaptureSize);
178    }
179    return status;
180}
181
182status_t Visualizer::getFft(uint8_t *fft)
183{
184    if (fft == NULL) {
185        return BAD_VALUE;
186    }
187    if (mCaptureSize == 0) {
188        return NO_INIT;
189    }
190
191    status_t status = NO_ERROR;
192    if (mEnabled) {
193        uint8_t buf[mCaptureSize];
194        status = getWaveForm(buf);
195        if (status == NO_ERROR) {
196            status = doFft(fft, buf);
197        }
198    } else {
199        memset(fft, 0, mCaptureSize);
200    }
201    return status;
202}
203
204status_t Visualizer::doFft(uint8_t *fft, uint8_t *waveform)
205{
206    int32_t workspace[mCaptureSize >> 1];
207    int32_t nonzero = 0;
208
209    for (uint32_t i = 0; i < mCaptureSize; i += 2) {
210        workspace[i >> 1] =
211                ((waveform[i] ^ 0x80) << 24) | ((waveform[i + 1] ^ 0x80) << 8);
212        nonzero |= workspace[i >> 1];
213    }
214
215    if (nonzero) {
216        fixed_fft_real(mCaptureSize >> 1, workspace);
217    }
218
219    for (uint32_t i = 0; i < mCaptureSize; i += 2) {
220        short tmp = workspace[i >> 1] >> 21;
221        while (tmp > 127 || tmp < -128) tmp >>= 1;
222        fft[i] = tmp;
223        tmp = workspace[i >> 1];
224        tmp >>= 5;
225        while (tmp > 127 || tmp < -128) tmp >>= 1;
226        fft[i + 1] = tmp;
227    }
228
229    return NO_ERROR;
230}
231
232void Visualizer::periodicCapture()
233{
234    Mutex::Autolock _l(mLock);
235    ALOGV("periodicCapture() %p mCaptureCallBack %p mCaptureFlags 0x%08x",
236            this, mCaptureCallBack, mCaptureFlags);
237    if (mCaptureCallBack != NULL &&
238        (mCaptureFlags & (CAPTURE_WAVEFORM|CAPTURE_FFT)) &&
239        mCaptureSize != 0) {
240        uint8_t waveform[mCaptureSize];
241        status_t status = getWaveForm(waveform);
242        if (status != NO_ERROR) {
243            return;
244        }
245        uint8_t fft[mCaptureSize];
246        if (mCaptureFlags & CAPTURE_FFT) {
247            status = doFft(fft, waveform);
248        }
249        if (status != NO_ERROR) {
250            return;
251        }
252        uint8_t *wavePtr = NULL;
253        uint8_t *fftPtr = NULL;
254        uint32_t waveSize = 0;
255        uint32_t fftSize = 0;
256        if (mCaptureFlags & CAPTURE_WAVEFORM) {
257            wavePtr = waveform;
258            waveSize = mCaptureSize;
259        }
260        if (mCaptureFlags & CAPTURE_FFT) {
261            fftPtr = fft;
262            fftSize = mCaptureSize;
263        }
264        mCaptureCallBack(mCaptureCbkUser, waveSize, wavePtr, fftSize, fftPtr, mSampleRate);
265    }
266}
267
268uint32_t Visualizer::initCaptureSize()
269{
270    uint32_t buf32[sizeof(effect_param_t) / sizeof(uint32_t) + 2];
271    effect_param_t *p = (effect_param_t *)buf32;
272
273    p->psize = sizeof(uint32_t);
274    p->vsize = sizeof(uint32_t);
275    *(int32_t *)p->data = VISUALIZER_PARAM_CAPTURE_SIZE;
276    status_t status = getParameter(p);
277
278    if (status == NO_ERROR) {
279        status = p->status;
280    }
281
282    uint32_t size = 0;
283    if (status == NO_ERROR) {
284        size = *((int32_t *)p->data + 1);
285    }
286    mCaptureSize = size;
287
288    ALOGV("initCaptureSize size %d status %d", mCaptureSize, status);
289
290    return size;
291}
292
293//-------------------------------------------------------------------------
294
295Visualizer::CaptureThread::CaptureThread(Visualizer& receiver, uint32_t captureRate, bool bCanCallJava)
296    : Thread(bCanCallJava), mReceiver(receiver)
297{
298    mSleepTimeUs = 1000000000 / captureRate;
299    ALOGV("CaptureThread cstor %p captureRate %d mSleepTimeUs %d", this, captureRate, mSleepTimeUs);
300}
301
302bool Visualizer::CaptureThread::threadLoop()
303{
304    ALOGV("CaptureThread %p enter", this);
305    while (!exitPending())
306    {
307        usleep(mSleepTimeUs);
308        mReceiver.periodicCapture();
309    }
310    ALOGV("CaptureThread %p exiting", this);
311    return false;
312}
313
314status_t Visualizer::CaptureThread::readyToRun()
315{
316    return NO_ERROR;
317}
318
319void Visualizer::CaptureThread::onFirstRef()
320{
321}
322
323}; // namespace android
324
325