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      1 /*
      2  * Copyright (C) 2017 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 // Play silence and recover from dead servers or disconnected devices.
     18 
     19 #include <stdio.h>
     20 
     21 #include <aaudio/AAudio.h>
     22 
     23 
     24 #define DEFAULT_TIMEOUT_NANOS  ((int64_t)1000000000)
     25 
     26 static const char *getSharingModeText(aaudio_sharing_mode_t mode) {
     27     const char *modeText = "unknown";
     28     switch (mode) {
     29         case AAUDIO_SHARING_MODE_EXCLUSIVE:
     30             modeText = "EXCLUSIVE";
     31             break;
     32         case AAUDIO_SHARING_MODE_SHARED:
     33             modeText = "SHARED";
     34             break;
     35         default:
     36             break;
     37     }
     38     return modeText;
     39 }
     40 
     41 int main(int argc, char **argv) {
     42     (void) argc;
     43     (void *)argv;
     44 
     45     aaudio_result_t result = AAUDIO_OK;
     46 
     47     int32_t triesLeft = 3;
     48     int32_t bufferCapacity;
     49     int32_t framesPerBurst = 0;
     50     float *buffer = nullptr;
     51 
     52     int32_t actualChannelCount = 0;
     53     int32_t actualSampleRate = 0;
     54     aaudio_format_t actualDataFormat = AAUDIO_FORMAT_PCM_FLOAT;
     55     aaudio_sharing_mode_t actualSharingMode = AAUDIO_SHARING_MODE_SHARED;
     56 
     57     AAudioStreamBuilder *aaudioBuilder = nullptr;
     58     AAudioStream *aaudioStream = nullptr;
     59 
     60     // Make printf print immediately so that debug info is not stuck
     61     // in a buffer if we hang or crash.
     62     setvbuf(stdout, nullptr, _IONBF, (size_t) 0);
     63 
     64     printf("TestRecovery:\n");
     65 
     66     // Use an AAudioStreamBuilder to contain requested parameters.
     67     result = AAudio_createStreamBuilder(&aaudioBuilder);
     68     if (result != AAUDIO_OK) {
     69         printf("AAudio_createStreamBuilder returned %s",
     70                AAudio_convertResultToText(result));
     71         goto finish;
     72     }
     73 
     74     // Request stream properties.
     75     AAudioStreamBuilder_setFormat(aaudioBuilder, AAUDIO_FORMAT_PCM_FLOAT);
     76 
     77     while (triesLeft-- > 0) {
     78         // Create an AAudioStream using the Builder.
     79         result = AAudioStreamBuilder_openStream(aaudioBuilder, &aaudioStream);
     80         if (result != AAUDIO_OK) {
     81             printf("AAudioStreamBuilder_openStream returned %s",
     82                    AAudio_convertResultToText(result));
     83             goto finish;
     84         }
     85 
     86         // Check to see what kind of stream we actually got.
     87         actualSampleRate = AAudioStream_getSampleRate(aaudioStream);
     88         actualChannelCount = AAudioStream_getChannelCount(aaudioStream);
     89         actualDataFormat = AAudioStream_getFormat(aaudioStream);
     90 
     91         printf("-------- chans = %3d, rate = %6d format = %d\n",
     92                 actualChannelCount, actualSampleRate, actualDataFormat);
     93 
     94         // This is the number of frames that are read in one chunk by a DMA controller
     95         // or a DSP or a mixer.
     96         framesPerBurst = AAudioStream_getFramesPerBurst(aaudioStream);
     97         bufferCapacity = AAudioStream_getBufferCapacityInFrames(aaudioStream);
     98         printf("         bufferCapacity = %d, framesPerBurst = %d\n",
     99         bufferCapacity, framesPerBurst);
    100 
    101         int samplesPerBurst = framesPerBurst * actualChannelCount;
    102         buffer = new float[samplesPerBurst];
    103 
    104         result = AAudioStream_requestStart(aaudioStream);
    105         if (result != AAUDIO_OK) {
    106             printf("AAudioStream_requestStart returned %s",
    107                    AAudio_convertResultToText(result));
    108             goto finish;
    109         }
    110 
    111         // Play silence for awhile.
    112         int32_t framesMax = actualSampleRate * 20;
    113         int64_t framesTotal = 0;
    114         int64_t printAt = actualSampleRate;
    115         while (result == AAUDIO_OK && framesTotal < framesMax) {
    116             int32_t framesWritten = AAudioStream_write(aaudioStream,
    117                                                        buffer, framesPerBurst,
    118                                                        DEFAULT_TIMEOUT_NANOS);
    119             if (framesWritten < 0) {
    120                 result = framesWritten;
    121                 printf("write() returned %s, frames = %d\n",
    122                        AAudio_convertResultToText(result), (int)framesTotal);
    123                 printf("  frames = %d\n", (int)framesTotal);
    124             } else if (framesWritten != framesPerBurst) {
    125                 printf("write() returned %d, frames = %d\n", framesWritten, (int)framesTotal);
    126                 result = AAUDIO_ERROR_TIMEOUT;
    127             } else {
    128                 framesTotal += framesWritten;
    129                 if (framesTotal >= printAt) {
    130                     printf("frames = %d\n", (int)framesTotal);
    131                     printAt += actualSampleRate;
    132                 }
    133             }
    134         }
    135         result = AAudioStream_requestStop(aaudioStream);
    136         if (result != AAUDIO_OK) {
    137             printf("AAudioStream_requestStop returned %s\n",
    138                    AAudio_convertResultToText(result));
    139         }
    140         result = AAudioStream_close(aaudioStream);
    141         if (result != AAUDIO_OK) {
    142             printf("AAudioStream_close returned %s\n",
    143                    AAudio_convertResultToText(result));
    144         }
    145         aaudioStream = nullptr;
    146     }
    147 
    148 finish:
    149     if (aaudioStream != nullptr) {
    150         AAudioStream_close(aaudioStream);
    151     }
    152     AAudioStreamBuilder_delete(aaudioBuilder);
    153     delete[] buffer;
    154     printf("          result = %d = %s\n", result, AAudio_convertResultToText(result));
    155 }
    156