/*

opensl_io.c:

Android OpenSL input/output module

Copyright (c) 2012, Victor Lazzarini

All rights reserved.

Redistribution and use in source and binary forms, with or without

modification, are permitted provided that the following conditions are met:

    * Redistributions of source code must retain the above copyright

      notice, this list of conditions and the following disclaimer.

    * Redistributions in binary form must reproduce the above copyright

      notice, this list of conditions and the following disclaimer in the

      documentation and/or other materials provided with the distribution.

    * Neither the name of the <organization> nor the

      names of its contributors may be used to endorse or promote products

      derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND

ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE

DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY

DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES

(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;

LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND

ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS

SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

*/

#include <assert.h>

#include "audin_main.h"

#include "opensl_io.h"

#define CONV16BIT 32768

#define CONVMYFLT (1. / 32768.)

typedef struct

{

	size_t size;

	void* data;

} queue_element;

struct opensl_stream

{

	// engine interfaces

	SLObjectItf engineObject;

	SLEngineItf engineEngine;

	// device interfaces

	SLDeviceVolumeItf deviceVolume;

	// recorder interfaces

	SLObjectItf recorderObject;

	SLRecordItf recorderRecord;

	SLAndroidSimpleBufferQueueItf recorderBufferQueue;

	unsigned int inchannels;

	unsigned int sr;

	unsigned int buffersize;

	unsigned int bits_per_sample;

	queue_element* prep;

	queue_element* next;

	void* context;

	opensl_receive_t receive;

};

static void bqRecorderCallback(SLAndroidSimpleBufferQueueItf bq, void* context);

// creates the OpenSL ES audio engine

static SLresult openSLCreateEngine(OPENSL_STREAM* p)

{

	SLresult result;

	// create engine

	result = slCreateEngine(&(p->engineObject), 0, NULL, 0, NULL, NULL);

	if (result != SL_RESULT_SUCCESS)

		goto engine_end;

	// realize the engine

	result = (*p->engineObject)->Realize(p->engineObject, SL_BOOLEAN_FALSE);

	if (result != SL_RESULT_SUCCESS)

		goto engine_end;

	// get the engine interface, which is needed in order to create other objects

	result = (*p->engineObject)->GetInterface(p->engineObject, SL_IID_ENGINE, &(p->engineEngine));

	if (result != SL_RESULT_SUCCESS)

		goto engine_end;

	// get the volume interface - important, this is optional!

	result =

	    (*p->engineObject)->GetInterface(p->engineObject, SL_IID_DEVICEVOLUME, &(p->deviceVolume));

	if (result != SL_RESULT_SUCCESS)

	{

		p->deviceVolume = NULL;

		result = SL_RESULT_SUCCESS;

	}

engine_end:

	assert(SL_RESULT_SUCCESS == result);

	return result;

}

// Open the OpenSL ES device for input

static SLresult openSLRecOpen(OPENSL_STREAM* p)

{

	SLresult result;

	SLuint32 sr = p->sr;

	SLuint32 channels = p->inchannels;

	assert(!p->recorderObject);

	if (channels)

	{

		switch (sr)

		{

			case 8000:

				sr = SL_SAMPLINGRATE_8;

				break;

			case 11025:

				sr = SL_SAMPLINGRATE_11_025;

				break;

			case 16000:

				sr = SL_SAMPLINGRATE_16;

				break;

			case 22050:

				sr = SL_SAMPLINGRATE_22_05;

				break;

			case 24000:

				sr = SL_SAMPLINGRATE_24;

				break;

			case 32000:

				sr = SL_SAMPLINGRATE_32;

				break;

			case 44100:

				sr = SL_SAMPLINGRATE_44_1;

				break;

			case 48000:

				sr = SL_SAMPLINGRATE_48;

				break;

			case 64000:

				sr = SL_SAMPLINGRATE_64;

				break;

			case 88200:

				sr = SL_SAMPLINGRATE_88_2;

				break;

			case 96000:

				sr = SL_SAMPLINGRATE_96;

				break;

			case 192000:

				sr = SL_SAMPLINGRATE_192;

				break;

			default:

				return -1;

		}

		// configure audio source

		SLDataLocator_IODevice loc_dev = { SL_DATALOCATOR_IODEVICE, SL_IODEVICE_AUDIOINPUT,

			                               SL_DEFAULTDEVICEID_AUDIOINPUT, NULL };

		SLDataSource audioSrc = { &loc_dev, NULL };

		// configure audio sink

		int speakers;

		if (channels > 1)

			speakers = SL_SPEAKER_FRONT_LEFT | SL_SPEAKER_FRONT_RIGHT;

		else

			speakers = SL_SPEAKER_FRONT_CENTER;

		SLDataLocator_AndroidSimpleBufferQueue loc_bq = { SL_DATALOCATOR_ANDROIDSIMPLEBUFFERQUEUE,

			                                              2 };

		SLDataFormat_PCM format_pcm;

		format_pcm.formatType = SL_DATAFORMAT_PCM;

		format_pcm.numChannels = channels;

		format_pcm.samplesPerSec = sr;

		format_pcm.channelMask = speakers;

		format_pcm.endianness = SL_BYTEORDER_LITTLEENDIAN;

		if (16 == p->bits_per_sample)

		{

			format_pcm.bitsPerSample = SL_PCMSAMPLEFORMAT_FIXED_16;

			format_pcm.containerSize = 16;

		}

		else if (8 == p->bits_per_sample)

		{

			format_pcm.bitsPerSample = SL_PCMSAMPLEFORMAT_FIXED_8;

			format_pcm.containerSize = 8;

		}

		else

			assert(0);

		SLDataSink audioSnk = { &loc_bq, &format_pcm };

		// create audio recorder

		// (requires the RECORD_AUDIO permission)

		const SLInterfaceID id[] = { SL_IID_ANDROIDSIMPLEBUFFERQUEUE };

		const SLboolean req[] = { SL_BOOLEAN_TRUE };

		result = (*p->engineEngine)

		             ->CreateAudioRecorder(p->engineEngine, &(p->recorderObject), &audioSrc,

		                                   &audioSnk, 1, id, req);

		assert(!result);

		if (SL_RESULT_SUCCESS != result)

			goto end_recopen;

		// realize the audio recorder

		result = (*p->recorderObject)->Realize(p->recorderObject, SL_BOOLEAN_FALSE);

		assert(!result);

		if (SL_RESULT_SUCCESS != result)

			goto end_recopen;

		// get the record interface

		result = (*p->recorderObject)

		             ->GetInterface(p->recorderObject, SL_IID_RECORD, &(p->recorderRecord));

		assert(!result);

		if (SL_RESULT_SUCCESS != result)

			goto end_recopen;

		// get the buffer queue interface

		result = (*p->recorderObject)

		             ->GetInterface(p->recorderObject, SL_IID_ANDROIDSIMPLEBUFFERQUEUE,

		                            &(p->recorderBufferQueue));

		assert(!result);

		if (SL_RESULT_SUCCESS != result)

			goto end_recopen;

		// register callback on the buffer queue

		result = (*p->recorderBufferQueue)

		             ->RegisterCallback(p->recorderBufferQueue, bqRecorderCallback, p);

		assert(!result);

		if (SL_RESULT_SUCCESS != result)

			goto end_recopen;

	end_recopen:

		return result;

	}

	else

		return SL_RESULT_SUCCESS;

}

// close the OpenSL IO and destroy the audio engine

static void openSLDestroyEngine(OPENSL_STREAM* p)

{

	// destroy audio recorder object, and invalidate all associated interfaces

	if (p->recorderObject != NULL)

	{

		(*p->recorderObject)->Destroy(p->recorderObject);

		p->recorderObject = NULL;

		p->recorderRecord = NULL;

		p->recorderBufferQueue = NULL;

	}

	// destroy engine object, and invalidate all associated interfaces

	if (p->engineObject != NULL)

	{

		(*p->engineObject)->Destroy(p->engineObject);

		p->engineObject = NULL;

		p->engineEngine = NULL;

	}

}

static queue_element* opensles_queue_element_new(size_t size)

{

	queue_element* q = calloc(1, sizeof(queue_element));

	if (!q)

		goto fail;

	q->size = size;

	q->data = malloc(size);

	if (!q->data)

		goto fail;

	return q;

fail:

	free(q);

	return NULL;

}

static void opensles_queue_element_free(void* obj)

{

	queue_element* e = (queue_element*)obj;

	if (e)

		free(e->data);

	free(e);

}

// open the android audio device for input

OPENSL_STREAM* android_OpenRecDevice(void* context, opensl_receive_t receive, int sr,

                                     int inchannels, int bufferframes, int bits_per_sample)

{

	OPENSL_STREAM* p;

	if (!context || !receive)

		return NULL;

	p = (OPENSL_STREAM*)calloc(1, sizeof(OPENSL_STREAM));

	if (!p)

		return NULL;

	p->context = context;

	p->receive = receive;

	p->inchannels = inchannels;

	p->sr = sr;

	p->buffersize = bufferframes;

	p->bits_per_sample = bits_per_sample;

	if ((p->bits_per_sample != 8) && (p->bits_per_sample != 16))

		goto fail;

	if (openSLCreateEngine(p) != SL_RESULT_SUCCESS)

		goto fail;

	if (openSLRecOpen(p) != SL_RESULT_SUCCESS)

		goto fail;

	/* Create receive buffers, prepare them and start recording */

	p->prep = opensles_queue_element_new(p->buffersize * p->bits_per_sample / 8);

	p->next = opensles_queue_element_new(p->buffersize * p->bits_per_sample / 8);

	if (!p->prep || !p->next)

		goto fail;

	(*p->recorderBufferQueue)->Enqueue(p->recorderBufferQueue, p->next->data, p->next->size);

	(*p->recorderBufferQueue)->Enqueue(p->recorderBufferQueue, p->prep->data, p->prep->size);

	(*p->recorderRecord)->SetRecordState(p->recorderRecord, SL_RECORDSTATE_RECORDING);

	return p;

fail:

	android_CloseRecDevice(p);

	return NULL;

}

// close the android audio device

void android_CloseRecDevice(OPENSL_STREAM* p)

{

	if (p == NULL)

		return;

	opensles_queue_element_free(p->next);

	opensles_queue_element_free(p->prep);

	openSLDestroyEngine(p);

	free(p);

}

// this callback handler is called every time a buffer finishes recording

static void bqRecorderCallback(SLAndroidSimpleBufferQueueItf bq, void* context)

{

	OPENSL_STREAM* p = (OPENSL_STREAM*)context;

	queue_element* e;

	if (!p)

		return;

	e = p->next;

	if (!e)

		return;

	if (!p->context || !p->receive)

		WLog_WARN(TAG, "Missing receive callback=%p, context=%p", p->receive, p->context);

	else

		p->receive(p->context, e->data, e->size);

	p->next = p->prep;

	p->prep = e;

	(*p->recorderBufferQueue)->Enqueue(p->recorderBufferQueue, e->data, e->size);

}