libaaudio: implement callback

# include $(call all-subdir-makefiles)

# Just include static/ for now.

LOCAL_PATH := $(call my-dir)

#include $(LOCAL_PATH)/jni/Android.mk

include $(LOCAL_PATH)/static/Android.mk

Monitor input level and print value.

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)

LOCAL_MODULE_TAGS := tests

LOCAL_C_INCLUDES := \

    $(call include-path-for, audio-utils) \

    frameworks/av/media/liboboe/include

LOCAL_SRC_FILES:= frameworks/av/media/liboboe/src/write_sine.cpp

LOCAL_SHARED_LIBRARIES := libaudioutils libmedia libtinyalsa \

        libbinder libcutils libutils

LOCAL_STATIC_LIBRARIES := libsndfile

LOCAL_MODULE := write_sine_ndk

LOCAL_SHARED_LIBRARIES += liboboe_prebuilt

include $(BUILD_EXECUTABLE)

include $(CLEAR_VARS)

LOCAL_MODULE_TAGS := tests

LOCAL_C_INCLUDES := \

    $(call include-path-for, audio-utils) \

    frameworks/av/media/liboboe/include

LOCAL_SRC_FILES:= frameworks/av/media/liboboe/src/write_sine_threaded.cpp

LOCAL_SHARED_LIBRARIES := libaudioutils libmedia libtinyalsa \

        libbinder libcutils libutils

LOCAL_STATIC_LIBRARIES := libsndfile

LOCAL_MODULE := write_sine_threaded_ndk

LOCAL_SHARED_LIBRARIES += liboboe_prebuilt

include $(BUILD_EXECUTABLE)

include $(CLEAR_VARS)

LOCAL_MODULE := liboboe_prebuilt

LOCAL_SRC_FILES := liboboe.so

LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include

include $(PREBUILT_SHARED_LIBRARY)

# TODO remove then when we support other architectures

APP_ABI := arm64-v8a

APP_CPPFLAGS += -std=c++11

/*

 * Copyright (C) 2017 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.

 */

// Record input using AAudio and display the peak amplitudes.

#include <new>

#include <assert.h>

#include <stdio.h>

#include <stdlib.h>

#include <math.h>

#include <aaudio/AAudioDefinitions.h>

#include <aaudio/AAudio.h>

#define SAMPLE_RATE        48000

#define NUM_SECONDS        10

#define NANOS_PER_MICROSECOND ((int64_t)1000)

#define NANOS_PER_MILLISECOND (NANOS_PER_MICROSECOND * 1000)

#define NANOS_PER_SECOND   (NANOS_PER_MILLISECOND * 1000)

#define DECAY_FACTOR       0.999

#define MIN_FRAMES_TO_READ 48  /* arbitrary, 1 msec at 48000 Hz */

static const char *getSharingModeText(aaudio_sharing_mode_t mode) {

    const char *modeText = "unknown";

    switch (mode) {

    case AAUDIO_SHARING_MODE_EXCLUSIVE:

        modeText = "EXCLUSIVE";

        break;

    case AAUDIO_SHARING_MODE_SHARED:

        modeText = "SHARED";

        break;

    default:

        break;

    }

    return modeText;

}

int main(int argc, char **argv)

{

    (void)argc; // unused

    aaudio_result_t result;

    int actualSamplesPerFrame;

    int actualSampleRate;

    const aaudio_audio_format_t requestedDataFormat = AAUDIO_FORMAT_PCM_I16;

    aaudio_audio_format_t actualDataFormat;

    const aaudio_sharing_mode_t requestedSharingMode = AAUDIO_SHARING_MODE_SHARED;

    aaudio_sharing_mode_t actualSharingMode;

    AAudioStreamBuilder *aaudioBuilder = nullptr;

    AAudioStream *aaudioStream = nullptr;

    aaudio_stream_state_t state;

    int32_t framesPerBurst = 0;

    int32_t framesPerRead = 0;

    int32_t framesToRecord = 0;

    int32_t framesLeft = 0;

    int32_t xRunCount = 0;

    int16_t *data = nullptr;

    float peakLevel = 0.0;

    int loopCounter = 0;

    // Make printf print immediately so that debug info is not stuck

    // in a buffer if we hang or crash.

    setvbuf(stdout, nullptr, _IONBF, (size_t) 0);

    printf("%s - Monitor input level using AAudio\n", argv[0]);

    // Use an AAudioStreamBuilder to contain requested parameters.

    result = AAudio_createStreamBuilder(&aaudioBuilder);

    if (result != AAUDIO_OK) {

        goto finish;

    }

    // Request stream properties.

    AAudioStreamBuilder_setDirection(aaudioBuilder, AAUDIO_DIRECTION_INPUT);

    AAudioStreamBuilder_setFormat(aaudioBuilder, requestedDataFormat);

    AAudioStreamBuilder_setSharingMode(aaudioBuilder, requestedSharingMode);

    // Create an AAudioStream using the Builder.

    result = AAudioStreamBuilder_openStream(aaudioBuilder, &aaudioStream);

    if (result != AAUDIO_OK) {

        goto finish;

    }

    actualSamplesPerFrame = AAudioStream_getSamplesPerFrame(aaudioStream);

    printf("SamplesPerFrame = %d\n", actualSamplesPerFrame);

    actualSampleRate = AAudioStream_getSampleRate(aaudioStream);

    printf("SamplesPerFrame = %d\n", actualSampleRate);

    actualSharingMode = AAudioStream_getSharingMode(aaudioStream);

    printf("SharingMode: requested = %s, actual = %s\n",

            getSharingModeText(requestedSharingMode),

            getSharingModeText(actualSharingMode));

    // This is the number of frames that are written in one chunk by a DMA controller

    // or a DSP.

    framesPerBurst = AAudioStream_getFramesPerBurst(aaudioStream);

    printf("DataFormat: framesPerBurst = %d\n",framesPerBurst);

    // Some DMA might use very short bursts of 16 frames. We don't need to read such small

    // buffers. But it helps to use a multiple of the burst size for predictable scheduling.

    framesPerRead = framesPerBurst;

    while (framesPerRead < MIN_FRAMES_TO_READ) {

        framesPerRead *= 2;

    }

    printf("DataFormat: framesPerRead = %d\n",framesPerRead);

    actualDataFormat = AAudioStream_getFormat(aaudioStream);

    printf("DataFormat: requested = %d, actual = %d\n", requestedDataFormat, actualDataFormat);

    // TODO handle other data formats

    assert(actualDataFormat == AAUDIO_FORMAT_PCM_I16);

    // Allocate a buffer for the audio data.

    data = new(std::nothrow) int16_t[framesPerRead * actualSamplesPerFrame];

    if (data == nullptr) {

        fprintf(stderr, "ERROR - could not allocate data buffer\n");

        result = AAUDIO_ERROR_NO_MEMORY;

        goto finish;

    }

    // Start the stream.

    printf("call AAudioStream_requestStart()\n");

    result = AAudioStream_requestStart(aaudioStream);

    if (result != AAUDIO_OK) {

        fprintf(stderr, "ERROR - AAudioStream_requestStart() returned %d\n", result);

        goto finish;

    }

    state = AAudioStream_getState(aaudioStream);

    printf("after start, state = %s\n", AAudio_convertStreamStateToText(state));

    // Play for a while.

    framesToRecord = actualSampleRate * NUM_SECONDS;

    framesLeft = framesToRecord;

    while (framesLeft > 0) {

        // Read audio data from the stream.

        int64_t timeoutNanos = 100 * NANOS_PER_MILLISECOND;

        int minFrames = (framesToRecord < framesPerRead) ? framesToRecord : framesPerRead;

        int actual = AAudioStream_read(aaudioStream, data, minFrames, timeoutNanos);

        if (actual < 0) {

            fprintf(stderr, "ERROR - AAudioStream_read() returned %zd\n", actual);

            goto finish;

        } else if (actual == 0) {

            fprintf(stderr, "WARNING - AAudioStream_read() returned %zd\n", actual);

            goto finish;

        }

        framesLeft -= actual;

        // Peak follower.

        for (int frameIndex = 0; frameIndex < actual; frameIndex++) {

            float sample = data[frameIndex * actualSamplesPerFrame] * (1.0/32768);

            peakLevel *= DECAY_FACTOR;

            if (sample > peakLevel) {

                peakLevel = sample;

            }

        }

        // Display level as stars, eg. "******".

        if ((loopCounter++ % 10) == 0) {

            printf("%5.3f ", peakLevel);

            int numStars = (int)(peakLevel * 50);

            for (int i = 0; i < numStars; i++) {

                printf("*");

            }

            printf("\n");

        }

    }

    xRunCount = AAudioStream_getXRunCount(aaudioStream);

    printf("AAudioStream_getXRunCount %d\n", xRunCount);

finish:

    delete[] data;

    AAudioStream_close(aaudioStream);

    AAudioStreamBuilder_delete(aaudioBuilder);

    printf("exiting - AAudio result = %d = %s\n", result, AAudio_convertResultToText(result));

    return (result != AAUDIO_OK) ? EXIT_FAILURE : EXIT_SUCCESS;

}