| /* |
| * 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 "EffectVisualizer" |
| //#define LOG_NDEBUG 0 |
| #include <cutils/log.h> |
| #include <assert.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <new> |
| #include <time.h> |
| #include <audio_effects/effect_visualizer.h> |
| |
| |
| extern "C" { |
| |
| // effect_handle_t interface implementation for visualizer effect |
| extern 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_CONTROL_API_VERSION, |
| (EFFECT_FLAG_TYPE_INSERT | EFFECT_FLAG_INSERT_FIRST), |
| 0, // TODO |
| 1, |
| "Visualizer", |
| "The Android Open Source Project", |
| }; |
| |
| enum visualizer_state_e { |
| VISUALIZER_STATE_UNINITIALIZED, |
| VISUALIZER_STATE_INITIALIZED, |
| VISUALIZER_STATE_ACTIVE, |
| }; |
| |
| // maximum time since last capture buffer update before resetting capture buffer. This means |
| // that the framework has stopped playing audio and we must start returning silence |
| #define MAX_STALL_TIME_MS 1000 |
| |
| #define CAPTURE_BUF_SIZE 65536 // "64k should be enough for everyone" |
| |
| struct VisualizerContext { |
| const struct effect_interface_s *mItfe; |
| effect_config_t mConfig; |
| uint32_t mCaptureIdx; |
| uint32_t mCaptureSize; |
| uint32_t mScalingMode; |
| uint8_t mState; |
| uint8_t mLastCaptureIdx; |
| uint32_t mLatency; |
| struct timespec mBufferUpdateTime; |
| uint8_t mCaptureBuf[CAPTURE_BUF_SIZE]; |
| }; |
| |
| // |
| //--- Local functions |
| // |
| |
| void Visualizer_reset(VisualizerContext *pContext) |
| { |
| pContext->mCaptureIdx = 0; |
| pContext->mLastCaptureIdx = 0; |
| pContext->mBufferUpdateTime.tv_sec = 0; |
| pContext->mLatency = 0; |
| memset(pContext->mCaptureBuf, 0x80, CAPTURE_BUF_SIZE); |
| } |
| |
| //---------------------------------------------------------------------------- |
| // Visualizer_setConfig() |
| //---------------------------------------------------------------------------- |
| // 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_setConfig(VisualizerContext *pContext, effect_config_t *pConfig) |
| { |
| ALOGV("Visualizer_setConfig 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 != AUDIO_CHANNEL_OUT_STEREO) return -EINVAL; |
| if (pConfig->outputCfg.accessMode != EFFECT_BUFFER_ACCESS_WRITE && |
| pConfig->outputCfg.accessMode != EFFECT_BUFFER_ACCESS_ACCUMULATE) return -EINVAL; |
| if (pConfig->inputCfg.format != AUDIO_FORMAT_PCM_16_BIT) return -EINVAL; |
| |
| pContext->mConfig = *pConfig; |
| |
| Visualizer_reset(pContext); |
| |
| return 0; |
| } |
| |
| |
| //---------------------------------------------------------------------------- |
| // Visualizer_getConfig() |
| //---------------------------------------------------------------------------- |
| // Purpose: Get input and output audio configuration. |
| // |
| // Inputs: |
| // pContext: effect engine context |
| // pConfig: pointer to effect_config_t structure holding input and output |
| // configuration parameters |
| // |
| // Outputs: |
| // |
| //---------------------------------------------------------------------------- |
| |
| void Visualizer_getConfig(VisualizerContext *pContext, effect_config_t *pConfig) |
| { |
| *pConfig = pContext->mConfig; |
| } |
| |
| |
| //---------------------------------------------------------------------------- |
| // 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 = AUDIO_CHANNEL_OUT_STEREO; |
| pContext->mConfig.inputCfg.format = AUDIO_FORMAT_PCM_16_BIT; |
| 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 = AUDIO_CHANNEL_OUT_STEREO; |
| pContext->mConfig.outputCfg.format = AUDIO_FORMAT_PCM_16_BIT; |
| 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; |
| pContext->mScalingMode = VISUALIZER_SCALING_MODE_NORMALIZED; |
| |
| Visualizer_setConfig(pContext, &pContext->mConfig); |
| |
| return 0; |
| } |
| |
| // |
| //--- Effect Library Interface Implementation |
| // |
| |
| int VisualizerLib_Create(const effect_uuid_t *uuid, |
| int32_t sessionId, |
| int32_t ioId, |
| effect_handle_t *pHandle) { |
| int ret; |
| int i; |
| |
| if (pHandle == 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) { |
| ALOGW("VisualizerLib_Create() init failed"); |
| delete pContext; |
| return ret; |
| } |
| |
| *pHandle = (effect_handle_t)pContext; |
| |
| pContext->mState = VISUALIZER_STATE_INITIALIZED; |
| |
| ALOGV("VisualizerLib_Create %p", pContext); |
| |
| return 0; |
| |
| } |
| |
| int VisualizerLib_Release(effect_handle_t handle) { |
| VisualizerContext * pContext = (VisualizerContext *)handle; |
| |
| ALOGV("VisualizerLib_Release %p", handle); |
| if (pContext == NULL) { |
| return -EINVAL; |
| } |
| pContext->mState = VISUALIZER_STATE_UNINITIALIZED; |
| delete pContext; |
| |
| return 0; |
| } |
| |
| int VisualizerLib_GetDescriptor(const effect_uuid_t *uuid, |
| effect_descriptor_t *pDescriptor) { |
| |
| if (pDescriptor == NULL || uuid == NULL){ |
| ALOGV("VisualizerLib_GetDescriptor() called with NULL pointer"); |
| return -EINVAL; |
| } |
| |
| if (memcmp(uuid, &gVisualizerDescriptor.uuid, sizeof(effect_uuid_t)) == 0) { |
| *pDescriptor = gVisualizerDescriptor; |
| return 0; |
| } |
| |
| return -EINVAL; |
| } /* end VisualizerLib_GetDescriptor */ |
| |
| // |
| //--- Effect Control Interface Implementation |
| // |
| |
| static inline int16_t clamp16(int32_t sample) |
| { |
| if ((sample>>15) ^ (sample>>31)) |
| sample = 0x7FFF ^ (sample>>31); |
| return sample; |
| } |
| |
| int Visualizer_process( |
| effect_handle_t self,audio_buffer_t *inBuffer, audio_buffer_t *outBuffer) |
| { |
| VisualizerContext * pContext = (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 |
| int32_t shift; |
| |
| if (pContext->mScalingMode == VISUALIZER_SCALING_MODE_NORMALIZED) { |
| // derive capture scaling factor from peak value in current buffer |
| // this gives more interesting captures for display. |
| shift = 32; |
| int len = inBuffer->frameCount * 2; |
| for (int 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++; |
| } else { |
| assert(pContext->mScalingMode == VISUALIZER_SCALING_MODE_AS_PLAYED); |
| shift = 9; |
| } |
| |
| uint32_t captIdx; |
| uint32_t inIdx; |
| uint8_t *buf = pContext->mCaptureBuf; |
| for (inIdx = 0, captIdx = pContext->mCaptureIdx; |
| inIdx < inBuffer->frameCount; |
| inIdx++, captIdx++) { |
| if (captIdx >= CAPTURE_BUF_SIZE) { |
| // wrap around |
| captIdx = 0; |
| } |
| int32_t smp = inBuffer->s16[2 * inIdx] + inBuffer->s16[2 * inIdx + 1]; |
| smp = smp >> shift; |
| buf[captIdx] = ((uint8_t)smp)^0x80; |
| } |
| |
| // XXX the following two should really be atomic, though it probably doesn't |
| // matter much for visualization purposes |
| pContext->mCaptureIdx = captIdx; |
| // update last buffer update time stamp |
| if (clock_gettime(CLOCK_MONOTONIC, &pContext->mBufferUpdateTime) < 0) { |
| pContext->mBufferUpdateTime.tv_sec = 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 |
| |
| int Visualizer_command(effect_handle_t self, uint32_t cmdCode, uint32_t cmdSize, |
| void *pCmdData, uint32_t *replySize, void *pReplyData) { |
| |
| VisualizerContext * pContext = (VisualizerContext *)self; |
| int retsize; |
| |
| if (pContext == NULL || pContext->mState == VISUALIZER_STATE_UNINITIALIZED) { |
| return -EINVAL; |
| } |
| |
| // ALOGV("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_SET_CONFIG: |
| if (pCmdData == NULL || cmdSize != sizeof(effect_config_t) |
| || pReplyData == NULL || *replySize != sizeof(int)) { |
| return -EINVAL; |
| } |
| *(int *) pReplyData = Visualizer_setConfig(pContext, |
| (effect_config_t *) pCmdData); |
| break; |
| case EFFECT_CMD_GET_CONFIG: |
| if (pReplyData == NULL || |
| *replySize != sizeof(effect_config_t)) { |
| return -EINVAL; |
| } |
| Visualizer_getConfig(pContext, (effect_config_t *)pReplyData); |
| 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; |
| ALOGV("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; |
| ALOGV("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)) { |
| p->status = -EINVAL; |
| break; |
| } |
| switch (*(uint32_t *)p->data) { |
| case VISUALIZER_PARAM_CAPTURE_SIZE: |
| ALOGV("get mCaptureSize = %d", pContext->mCaptureSize); |
| *((uint32_t *)p->data + 1) = pContext->mCaptureSize; |
| p->vsize = sizeof(uint32_t); |
| *replySize += sizeof(uint32_t); |
| break; |
| case VISUALIZER_PARAM_SCALING_MODE: |
| ALOGV("get mScalingMode = %d", pContext->mScalingMode); |
| *((uint32_t *)p->data + 1) = pContext->mScalingMode; |
| p->vsize = sizeof(uint32_t); |
| *replySize += sizeof(uint32_t); |
| break; |
| default: |
| p->status = -EINVAL; |
| } |
| } 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)) { |
| *(int32_t *)pReplyData = -EINVAL; |
| break; |
| } |
| switch (*(uint32_t *)p->data) { |
| case VISUALIZER_PARAM_CAPTURE_SIZE: |
| pContext->mCaptureSize = *((uint32_t *)p->data + 1); |
| ALOGV("set mCaptureSize = %d", pContext->mCaptureSize); |
| break; |
| case VISUALIZER_PARAM_SCALING_MODE: |
| pContext->mScalingMode = *((uint32_t *)p->data + 1); |
| ALOGV("set mScalingMode = %d", pContext->mScalingMode); |
| break; |
| case VISUALIZER_PARAM_LATENCY: |
| pContext->mLatency = *((uint32_t *)p->data + 1); |
| ALOGV("set mLatency = %d", pContext->mLatency); |
| break; |
| default: |
| *(int32_t *)pReplyData = -EINVAL; |
| } |
| } break; |
| case EFFECT_CMD_SET_DEVICE: |
| case EFFECT_CMD_SET_VOLUME: |
| case EFFECT_CMD_SET_AUDIO_MODE: |
| break; |
| |
| |
| case VISUALIZER_CMD_CAPTURE: |
| if (pReplyData == NULL || *replySize != pContext->mCaptureSize) { |
| ALOGV("VISUALIZER_CMD_CAPTURE() error *replySize %d pContext->mCaptureSize %d", |
| *replySize, pContext->mCaptureSize); |
| return -EINVAL; |
| } |
| if (pContext->mState == VISUALIZER_STATE_ACTIVE) { |
| int32_t latencyMs = pContext->mLatency; |
| uint32_t deltaMs = 0; |
| if (pContext->mBufferUpdateTime.tv_sec != 0) { |
| struct timespec ts; |
| if (clock_gettime(CLOCK_MONOTONIC, &ts) == 0) { |
| time_t secs = ts.tv_sec - pContext->mBufferUpdateTime.tv_sec; |
| long nsec = ts.tv_nsec - pContext->mBufferUpdateTime.tv_nsec; |
| if (nsec < 0) { |
| --secs; |
| nsec += 1000000000; |
| } |
| deltaMs = secs * 1000 + nsec / 1000000; |
| latencyMs -= deltaMs; |
| if (latencyMs < 0) { |
| latencyMs = 0; |
| } |
| } |
| } |
| uint32_t deltaSmpl = pContext->mConfig.inputCfg.samplingRate * latencyMs / 1000; |
| |
| int32_t capturePoint = pContext->mCaptureIdx - pContext->mCaptureSize - deltaSmpl; |
| int32_t captureSize = pContext->mCaptureSize; |
| if (capturePoint < 0) { |
| int32_t size = -capturePoint; |
| if (size > captureSize) { |
| size = captureSize; |
| } |
| memcpy(pReplyData, |
| pContext->mCaptureBuf + CAPTURE_BUF_SIZE + capturePoint, |
| size); |
| pReplyData += size; |
| captureSize -= size; |
| capturePoint = 0; |
| } |
| memcpy(pReplyData, |
| pContext->mCaptureBuf + capturePoint, |
| captureSize); |
| |
| |
| // if audio framework has stopped playing audio although the effect is still |
| // active we must clear the capture buffer to return silence |
| if ((pContext->mLastCaptureIdx == pContext->mCaptureIdx) && |
| (pContext->mBufferUpdateTime.tv_sec != 0)) { |
| if (deltaMs > MAX_STALL_TIME_MS) { |
| ALOGV("capture going to idle"); |
| pContext->mBufferUpdateTime.tv_sec = 0; |
| memset(pReplyData, 0x80, pContext->mCaptureSize); |
| } |
| } |
| pContext->mLastCaptureIdx = pContext->mCaptureIdx; |
| } else { |
| memset(pReplyData, 0x80, pContext->mCaptureSize); |
| } |
| |
| break; |
| |
| default: |
| ALOGW("Visualizer_command invalid command %d",cmdCode); |
| return -EINVAL; |
| } |
| |
| return 0; |
| } |
| |
| /* Effect Control Interface Implementation: get_descriptor */ |
| int Visualizer_getDescriptor(effect_handle_t self, |
| effect_descriptor_t *pDescriptor) |
| { |
| VisualizerContext * pContext = (VisualizerContext *) self; |
| |
| if (pContext == NULL || pDescriptor == NULL) { |
| ALOGV("Visualizer_getDescriptor() invalid param"); |
| return -EINVAL; |
| } |
| |
| *pDescriptor = gVisualizerDescriptor; |
| |
| return 0; |
| } /* end Visualizer_getDescriptor */ |
| |
| // effect_handle_t interface implementation for visualizer effect |
| const struct effect_interface_s gVisualizerInterface = { |
| Visualizer_process, |
| Visualizer_command, |
| Visualizer_getDescriptor, |
| NULL, |
| }; |
| |
| // This is the only symbol that needs to be exported |
| __attribute__ ((visibility ("default"))) |
| audio_effect_library_t AUDIO_EFFECT_LIBRARY_INFO_SYM = { |
| tag : AUDIO_EFFECT_LIBRARY_TAG, |
| version : EFFECT_LIBRARY_API_VERSION, |
| name : "Visualizer Library", |
| implementor : "The Android Open Source Project", |
| create_effect : VisualizerLib_Create, |
| release_effect : VisualizerLib_Release, |
| get_descriptor : VisualizerLib_GetDescriptor, |
| }; |
| |
| }; // extern "C" |
