/*
* Copyright (C) 2010 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.
*/
#define LOG_TAG "Visualizer"
//#define LOG_NDEBUG 0
#include <cutils/log.h>
#include <assert.h>
#include <stdlib.h>
#include <string.h>
#include <new>
#include <media/EffectVisualizerApi.h>
namespace android {
// effect_interface_t interface implementation for visualizer effect
extern "C" const struct effect_interface_s gVisualizerInterface;
// Google Visualizer UUID: d069d9e0-8329-11df-9168-0002a5d5c51b
const effect_descriptor_t gVisualizerDescriptor = {
{0xe46b26a0, 0xdddd, 0x11db, 0x8afd, {0x00, 0x02, 0xa5, 0xd5, 0xc5, 0x1b}}, // type
{0xd069d9e0, 0x8329, 0x11df, 0x9168, {0x00, 0x02, 0xa5, 0xd5, 0xc5, 0x1b}}, // uuid
EFFECT_API_VERSION,
(EFFECT_FLAG_TYPE_INSERT | EFFECT_FLAG_INSERT_FIRST),
0, // TODO
1,
"Visualizer",
"Google Inc.",
};
enum visualizer_state_e {
VISUALIZER_STATE_UNINITIALIZED,
VISUALIZER_STATE_INITIALIZED,
VISUALIZER_STATE_ACTIVE,
};
struct VisualizerContext {
const struct effect_interface_s *mItfe;
effect_config_t mConfig;
uint32_t mState;
uint32_t mCaptureIdx;
uint32_t mCaptureSize;
uint32_t mCurrentBuf;
uint8_t mCaptureBuf[2][VISUALIZER_CAPTURE_SIZE_MAX];
};
//
//--- Local functions
//
void Visualizer_reset(VisualizerContext *pContext)
{
pContext->mCaptureIdx = 0;
pContext->mCurrentBuf = 0;
memset(pContext->mCaptureBuf[0], 0x80, VISUALIZER_CAPTURE_SIZE_MAX);
memset(pContext->mCaptureBuf[1], 0x80, VISUALIZER_CAPTURE_SIZE_MAX);
}
//----------------------------------------------------------------------------
// Visualizer_configure()
//----------------------------------------------------------------------------
// Purpose: Set input and output audio configuration.
//
// Inputs:
// pContext: effect engine context
// pConfig: pointer to effect_config_t structure holding input and output
// configuration parameters
//
// Outputs:
//
//----------------------------------------------------------------------------
int Visualizer_configure(VisualizerContext *pContext, effect_config_t *pConfig)
{
LOGV("Visualizer_configure start");
if (pConfig->inputCfg.samplingRate != pConfig->outputCfg.samplingRate) return -EINVAL;
if (pConfig->inputCfg.channels != pConfig->outputCfg.channels) return -EINVAL;
if (pConfig->inputCfg.format != pConfig->outputCfg.format) return -EINVAL;
if (pConfig->inputCfg.channels != CHANNEL_STEREO) return -EINVAL;
if (pConfig->outputCfg.accessMode != EFFECT_BUFFER_ACCESS_WRITE &&
pConfig->outputCfg.accessMode != EFFECT_BUFFER_ACCESS_ACCUMULATE) return -EINVAL;
if (pConfig->inputCfg.format != SAMPLE_FORMAT_PCM_S15) return -EINVAL;
memcpy(&pContext->mConfig, pConfig, sizeof(effect_config_t));
Visualizer_reset(pContext);
return 0;
}
//----------------------------------------------------------------------------
// Visualizer_init()
//----------------------------------------------------------------------------
// Purpose: Initialize engine with default configuration.
//
// Inputs:
// pContext: effect engine context
//
// Outputs:
//
//----------------------------------------------------------------------------
int Visualizer_init(VisualizerContext *pContext)
{
pContext->mConfig.inputCfg.accessMode = EFFECT_BUFFER_ACCESS_READ;
pContext->mConfig.inputCfg.channels = CHANNEL_STEREO;
pContext->mConfig.inputCfg.format = SAMPLE_FORMAT_PCM_S15;
pContext->mConfig.inputCfg.samplingRate = 44100;
pContext->mConfig.inputCfg.bufferProvider.getBuffer = NULL;
pContext->mConfig.inputCfg.bufferProvider.releaseBuffer = NULL;
pContext->mConfig.inputCfg.bufferProvider.cookie = NULL;
pContext->mConfig.inputCfg.mask = EFFECT_CONFIG_ALL;
pContext->mConfig.outputCfg.accessMode = EFFECT_BUFFER_ACCESS_ACCUMULATE;
pContext->mConfig.outputCfg.channels = CHANNEL_STEREO;
pContext->mConfig.outputCfg.format = SAMPLE_FORMAT_PCM_S15;
pContext->mConfig.outputCfg.samplingRate = 44100;
pContext->mConfig.outputCfg.bufferProvider.getBuffer = NULL;
pContext->mConfig.outputCfg.bufferProvider.releaseBuffer = NULL;
pContext->mConfig.outputCfg.bufferProvider.cookie = NULL;
pContext->mConfig.outputCfg.mask = EFFECT_CONFIG_ALL;
pContext->mCaptureSize = VISUALIZER_CAPTURE_SIZE_MAX;
Visualizer_configure(pContext, &pContext->mConfig);
return 0;
}
//
//--- Effect Library Interface Implementation
//
extern "C" int EffectQueryNumberEffects(uint32_t *pNumEffects) {
*pNumEffects = 1;
return 0;
}
extern "C" int EffectQueryEffect(uint32_t index, effect_descriptor_t *pDescriptor) {
if (pDescriptor == NULL) {
return -EINVAL;
}
if (index > 0) {
return -EINVAL;
}
memcpy(pDescriptor, &gVisualizerDescriptor, sizeof(effect_descriptor_t));
return 0;
}
extern "C" int EffectCreate(effect_uuid_t *uuid,
int32_t sessionId,
int32_t ioId,
effect_interface_t *pInterface) {
int ret;
int i;
if (pInterface == NULL || uuid == NULL) {
return -EINVAL;
}
if (memcmp(uuid, &gVisualizerDescriptor.uuid, sizeof(effect_uuid_t)) != 0) {
return -EINVAL;
}
VisualizerContext *pContext = new VisualizerContext;
pContext->mItfe = &gVisualizerInterface;
pContext->mState = VISUALIZER_STATE_UNINITIALIZED;
ret = Visualizer_init(pContext);
if (ret < 0) {
LOGW("EffectCreate() init failed");
delete pContext;
return ret;
}
*pInterface = (effect_interface_t)pContext;
pContext->mState = VISUALIZER_STATE_INITIALIZED;
LOGV("EffectCreate %p", pContext);
return 0;
}
extern "C" int EffectRelease(effect_interface_t interface) {
VisualizerContext * pContext = (VisualizerContext *)interface;
LOGV("EffectRelease %p", interface);
if (pContext == NULL) {
return -EINVAL;
}
pContext->mState = VISUALIZER_STATE_UNINITIALIZED;
delete pContext;
return 0;
}
//
//--- Effect Control Interface Implementation
//
static inline int16_t clamp16(int32_t sample)
{
if ((sample>>15) ^ (sample>>31))
sample = 0x7FFF ^ (sample>>31);
return sample;
}
extern "C" int Visualizer_process(
effect_interface_t self,audio_buffer_t *inBuffer, audio_buffer_t *outBuffer)
{
android::VisualizerContext * pContext = (android::VisualizerContext *)self;
if (pContext == NULL) {
return -EINVAL;
}
if (inBuffer == NULL || inBuffer->raw == NULL ||
outBuffer == NULL || outBuffer->raw == NULL ||
inBuffer->frameCount != outBuffer->frameCount ||
inBuffer->frameCount == 0) {
return -EINVAL;
}
// all code below assumes stereo 16 bit PCM output and input
// derive capture scaling factor from peak value in current buffer
// this gives more interesting captures for display.
int32_t shift = 32;
int len = inBuffer->frameCount * 2;
for (size_t i = 0; i < len; i++) {
int32_t smp = inBuffer->s16[i];
if (smp < 0) smp = -smp - 1; // take care to keep the max negative in range
int32_t clz = __builtin_clz(smp);
if (shift > clz) shift = clz;
}
// A maximum amplitude signal will have 17 leading zeros, which we want to
// translate to a shift of 8 (for converting 16 bit to 8 bit)
shift = 25 - shift;
// Never scale by less than 8 to avoid returning unaltered PCM signal.
if (shift < 3) {
shift = 3;
}
// add one to combine the division by 2 needed after summing left and right channels below
shift++;
uint32_t captIdx;
uint32_t inIdx;
uint8_t *buf = pContext->mCaptureBuf[pContext->mCurrentBuf];
for (inIdx = 0, captIdx = pContext->mCaptureIdx;
inIdx < inBuffer->frameCount && captIdx < pContext->mCaptureSize;
inIdx++, captIdx++) {
int32_t smp = inBuffer->s16[2 * inIdx] + inBuffer->s16[2 * inIdx + 1];
smp = smp >> shift;
buf[captIdx] = ((uint8_t)smp)^0x80;
}
pContext->mCaptureIdx = captIdx;
// go to next buffer when buffer full
if (pContext->mCaptureIdx == pContext->mCaptureSize) {
pContext->mCurrentBuf ^= 1;
pContext->mCaptureIdx = 0;
}
if (inBuffer->raw != outBuffer->raw) {
if (pContext->mConfig.outputCfg.accessMode == EFFECT_BUFFER_ACCESS_ACCUMULATE) {
for (size_t i = 0; i < outBuffer->frameCount*2; i++) {
outBuffer->s16[i] = clamp16(outBuffer->s16[i] + inBuffer->s16[i]);
}
} else {
memcpy(outBuffer->raw, inBuffer->raw, outBuffer->frameCount * 2 * sizeof(int16_t));
}
}
if (pContext->mState != VISUALIZER_STATE_ACTIVE) {
return -ENODATA;
}
return 0;
} // end Visualizer_process
extern "C" int Visualizer_command(effect_interface_t self, uint32_t cmdCode, uint32_t cmdSize,
void *pCmdData, uint32_t *replySize, void *pReplyData) {
android::VisualizerContext * pContext = (android::VisualizerContext *)self;
int retsize;
if (pContext == NULL || pContext->mState == VISUALIZER_STATE_UNINITIALIZED) {
return -EINVAL;
}
// LOGV("Visualizer_command command %d cmdSize %d",cmdCode, cmdSize);
switch (cmdCode) {
case EFFECT_CMD_INIT:
if (pReplyData == NULL || *replySize != sizeof(int)) {
return -EINVAL;
}
*(int *) pReplyData = Visualizer_init(pContext);
break;
case EFFECT_CMD_CONFIGURE:
if (pCmdData == NULL || cmdSize != sizeof(effect_config_t)
|| pReplyData == NULL || *replySize != sizeof(int)) {
return -EINVAL;
}
*(int *) pReplyData = Visualizer_configure(pContext,
(effect_config_t *) pCmdData);
break;
case EFFECT_CMD_RESET:
Visualizer_reset(pContext);
break;
case EFFECT_CMD_ENABLE:
if (pReplyData == NULL || *replySize != sizeof(int)) {
return -EINVAL;
}
if (pContext->mState != VISUALIZER_STATE_INITIALIZED) {
return -ENOSYS;
}
pContext->mState = VISUALIZER_STATE_ACTIVE;
LOGV("EFFECT_CMD_ENABLE() OK");
*(int *)pReplyData = 0;
break;
case EFFECT_CMD_DISABLE:
if (pReplyData == NULL || *replySize != sizeof(int)) {
return -EINVAL;
}
if (pContext->mState != VISUALIZER_STATE_ACTIVE) {
return -ENOSYS;
}
pContext->mState = VISUALIZER_STATE_INITIALIZED;
LOGV("EFFECT_CMD_DISABLE() OK");
*(int *)pReplyData = 0;
break;
case EFFECT_CMD_GET_PARAM: {
if (pCmdData == NULL ||
cmdSize != (int)(sizeof(effect_param_t) + sizeof(uint32_t)) ||
pReplyData == NULL ||
*replySize < (int)(sizeof(effect_param_t) + sizeof(uint32_t) + sizeof(uint32_t))) {
return -EINVAL;
}
memcpy(pReplyData, pCmdData, sizeof(effect_param_t) + sizeof(uint32_t));
effect_param_t *p = (effect_param_t *)pReplyData;
p->status = 0;
*replySize = sizeof(effect_param_t) + sizeof(uint32_t);
if (p->psize != sizeof(uint32_t) ||
*(uint32_t *)p->data != VISU_PARAM_CAPTURE_SIZE) {
p->status = -EINVAL;
break;
}
LOGV("get mCaptureSize = %d", pContext->mCaptureSize);
*((uint32_t *)p->data + 1) = pContext->mCaptureSize;
p->vsize = sizeof(uint32_t);
*replySize += sizeof(uint32_t);
} break;
case EFFECT_CMD_SET_PARAM: {
if (pCmdData == NULL ||
cmdSize != (int)(sizeof(effect_param_t) + sizeof(uint32_t) + sizeof(uint32_t)) ||
pReplyData == NULL || *replySize != sizeof(int32_t)) {
return -EINVAL;
}
*(int32_t *)pReplyData = 0;
effect_param_t *p = (effect_param_t *)pCmdData;
if (p->psize != sizeof(uint32_t) ||
p->vsize != sizeof(uint32_t) ||
*(uint32_t *)p->data != VISU_PARAM_CAPTURE_SIZE) {
*(int32_t *)pReplyData = -EINVAL;
break;;
}
pContext->mCaptureSize = *((uint32_t *)p->data + 1);
LOGV("set mCaptureSize = %d", pContext->mCaptureSize);
} break;
case EFFECT_CMD_SET_DEVICE:
case EFFECT_CMD_SET_VOLUME:
case EFFECT_CMD_SET_AUDIO_MODE:
break;
case VISU_CMD_CAPTURE:
if (pReplyData == NULL || *replySize != pContext->mCaptureSize) {
LOGV("VISU_CMD_CAPTURE() error *replySize %d pContext->mCaptureSize %d",
*replySize, pContext->mCaptureSize);
return -EINVAL;
}
if (pContext->mState == VISUALIZER_STATE_ACTIVE) {
memcpy(pReplyData,
pContext->mCaptureBuf[pContext->mCurrentBuf ^ 1],
pContext->mCaptureSize);
} else {
memset(pReplyData, 0x80, pContext->mCaptureSize);
}
break;
default:
LOGW("Visualizer_command invalid command %d",cmdCode);
return -EINVAL;
}
return 0;
}
// effect_interface_t interface implementation for visualizer effect
const struct effect_interface_s gVisualizerInterface = {
Visualizer_process,
Visualizer_command
};
} // namespace