add offloaded audio visualizer

Add library for visualizer effect used when
audio decompression is offloaded to QCOM audio DSP.
The implementation reads PCM back from the proxy port
in the audio DSP.
The audio HAL dynamically loads the effect library if present
and indicates offloaded output activity.
The PCM capture is only active when an offloaded output
is active and at least one effect is enabled on this output.

Bug: 8174410.

Change-Id: Ic78de932f9116e246494f9171c1cc7c3e35a0ea1

4 files changed, 1347 insertions, 0 deletions

diff --git a/visualizer/Android.mk b/visualizer/Android.mk
new file mode 100644
index 00000000..3c92044d
--- /dev/null
+++ b/visualizer/Android.mk
@@ -0,0 +1,36 @@
+# Copyright 2013 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.
+
+LOCAL_PATH:= $(call my-dir)
+
+include $(CLEAR_VARS)
+
+LOCAL_SRC_FILES:= \
+	offload_visualizer.c
+
+LOCAL_CFLAGS+= -O2 -fvisibility=hidden
+
+LOCAL_SHARED_LIBRARIES := \
+	libcutils \
+	liblog \
+	libtinyalsa
+
+LOCAL_MODULE_PATH := $(TARGET_OUT_SHARED_LIBRARIES)/soundfx
+LOCAL_MODULE:= libqcomvisualizer
+
+LOCAL_C_INCLUDES := \
+	external/tinyalsa/include \
+	$(call include-path-for, audio-effects)
+
+include $(BUILD_SHARED_LIBRARY)
diff --git a/visualizer/MODULE_LICENSE_APACHE2 b/visualizer/MODULE_LICENSE_APACHE2
new file mode 100644
index 00000000..e69de29b
--- /dev/null
+++ b/visualizer/MODULE_LICENSE_APACHE2
diff --git a/visualizer/NOTICE b/visualizer/NOTICE
new file mode 100644
index 00000000..ad6ed94f
--- /dev/null
+++ b/visualizer/NOTICE
@@ -0,0 +1,190 @@
+
+   Copyright (c) 2013, 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.
+
+   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.
+
+
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
+
+      "Licensor" shall mean the copyright owner or entity authorized by
+      the copyright owner that is granting the License.
+
+      "Legal Entity" shall mean the union of the acting entity and all
+      other entities that control, are controlled by, or are under common
+      control with that entity. For the purposes of this definition,
+      "control" means (i) the power, direct or indirect, to cause the
+      direction or management of such entity, whether by contract or
+      otherwise, or (ii) ownership of fifty percent (50%) or more of the
+      outstanding shares, or (iii) beneficial ownership of such entity.
+
+      "You" (or "Your") shall mean an individual or Legal Entity
+      exercising permissions granted by this License.
+
+      "Source" form shall mean the preferred form for making modifications,
+      including but not limited to software source code, documentation
+      source, and configuration files.
+
+      "Object" form shall mean any form resulting from mechanical
+      transformation or translation of a Source form, including but
+      not limited to compiled object code, generated documentation,
+      and conversions to other media types.
+
+      "Work" shall mean the work of authorship, whether in Source or
+      Object form, made available under the License, as indicated by a
+      copyright notice that is included in or attached to the work
+      (an example is provided in the Appendix below).
+
+      "Derivative Works" shall mean any work, whether in Source or Object
+      form, that is based on (or derived from) the Work and for which the
+      editorial revisions, annotations, elaborations, or other modifications
+      represent, as a whole, an original work of authorship. For the purposes
+      of this License, Derivative Works shall not include works that remain
+      separable from, or merely link (or bind by name) to the interfaces of,
+      the Work and Derivative Works thereof.
+
+      "Contribution" shall mean any work of authorship, including
+      the original version of the Work and any modifications or additions
+      to that Work or Derivative Works thereof, that is intentionally
+      submitted to Licensor for inclusion in the Work by the copyright owner
+      or by an individual or Legal Entity authorized to submit on behalf of
+      the copyright owner. For the purposes of this definition, "submitted"
+      means any form of electronic, verbal, or written communication sent
+      to the Licensor or its representatives, including but not limited to
+      communication on electronic mailing lists, source code control systems,
+      and issue tracking systems that are managed by, or on behalf of, the
+      Licensor for the purpose of discussing and improving the Work, but
+      excluding communication that is conspicuously marked or otherwise
+      designated in writing by the copyright owner as "Not a Contribution."
+
+      "Contributor" shall mean Licensor and any individual or Legal Entity
+      on behalf of whom a Contribution has been received by Licensor and
+      subsequently incorporated within the Work.
+
+   2. Grant of Copyright License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      copyright license to reproduce, prepare Derivative Works of,
+      publicly display, publicly perform, sublicense, and distribute the
+      Work and such Derivative Works in Source or Object form.
+
+   3. Grant of Patent License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      (except as stated in this section) patent license to make, have made,
+      use, offer to sell, sell, import, and otherwise transfer the Work,
+      where such license applies only to those patent claims licensable
+      by such Contributor that are necessarily infringed by their
+      Contribution(s) alone or by combination of their Contribution(s)
+      with the Work to which such Contribution(s) was submitted. If You
+      institute patent litigation against any entity (including a
+      cross-claim or counterclaim in a lawsuit) alleging that the Work
+      or a Contribution incorporated within the Work constitutes direct
+      or contributory patent infringement, then any patent licenses
+      granted to You under this License for that Work shall terminate
+      as of the date such litigation is filed.
+
+   4. Redistribution. You may reproduce and distribute copies of the
+      Work or Derivative Works thereof in any medium, with or without
+      modifications, and in Source or Object form, provided that You
+      meet the following conditions:
+
+      (a) You must give any other recipients of the Work or
+          Derivative Works a copy of this License; and
+
+      (b) You must cause any modified files to carry prominent notices
+          stating that You changed the files; and
+
+      (c) You must retain, in the Source form of any Derivative Works
+          that You distribute, all copyright, patent, trademark, and
+          attribution notices from the Source form of the Work,
+          excluding those notices that do not pertain to any part of
+          the Derivative Works; and
+
+      (d) If the Work includes a "NOTICE" text file as part of its
+          distribution, then any Derivative Works that You distribute must
+          include a readable copy of the attribution notices contained
+          within such NOTICE file, excluding those notices that do not
+          pertain to any part of the Derivative Works, in at least one
+          of the following places: within a NOTICE text file distributed
+          as part of the Derivative Works; within the Source form or
+          documentation, if provided along with the Derivative Works; or,
+          within a display generated by the Derivative Works, if and
+          wherever such third-party notices normally appear. The contents
+          of the NOTICE file are for informational purposes only and
+          do not modify the License. You may add Your own attribution
+          notices within Derivative Works that You distribute, alongside
+          or as an addendum to the NOTICE text from the Work, provided
+          that such additional attribution notices cannot be construed
+          as modifying the License.
+
+      You may add Your own copyright statement to Your modifications and
+      may provide additional or different license terms and conditions
+      for use, reproduction, or distribution of Your modifications, or
+      for any such Derivative Works as a whole, provided Your use,
+      reproduction, and distribution of the Work otherwise complies with
+      the conditions stated in this License.
+
+   5. Submission of Contributions. Unless You explicitly state otherwise,
+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
+      this License, without any additional terms or conditions.
+      Notwithstanding the above, nothing herein shall supersede or modify
+      the terms of any separate license agreement you may have executed
+      with Licensor regarding such Contributions.
+
+   6. Trademarks. This License does not grant permission to use the trade
+      names, trademarks, service marks, or product names of the Licensor,
+      except as required for reasonable and customary use in describing the
+      origin of the Work and reproducing the content of the NOTICE file.
+
+   7. Disclaimer of Warranty. Unless required by applicable law or
+      agreed to in writing, Licensor provides the Work (and each
+      Contributor provides its Contributions) on an "AS IS" BASIS,
+      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+      implied, including, without limitation, any warranties or conditions
+      of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
+      PARTICULAR PURPOSE. You are solely responsible for determining the
+      appropriateness of using or redistributing the Work and assume any
+      risks associated with Your exercise of permissions under this License.
+
+   8. Limitation of Liability. In no event and under no legal theory,
+      whether in tort (including negligence), contract, or otherwise,
+      unless required by applicable law (such as deliberate and grossly
+      negligent acts) or agreed to in writing, shall any Contributor be
+      liable to You for damages, including any direct, indirect, special,
+      incidental, or consequential damages of any character arising as a
+      result of this License or out of the use or inability to use the
+      Work (including but not limited to damages for loss of goodwill,
+      work stoppage, computer failure or malfunction, or any and all
+      other commercial damages or losses), even if such Contributor
+      has been advised of the possibility of such damages.
+
+   9. Accepting Warranty or Additional Liability. While redistributing
+      the Work or Derivative Works thereof, You may choose to offer,
+      and charge a fee for, acceptance of support, warranty, indemnity,
+      or other liability obligations and/or rights consistent with this
+      License. However, in accepting such obligations, You may act only
+      on Your own behalf and on Your sole responsibility, not on behalf
+      of any other Contributor, and only if You agree to indemnify,
+      defend, and hold each Contributor harmless for any liability
+      incurred by, or claims asserted against, such Contributor by reason
+      of your accepting any such warranty or additional liability.
+
+   END OF TERMS AND CONDITIONS
+
diff --git a/visualizer/offload_visualizer.c b/visualizer/offload_visualizer.c
new file mode 100644
index 00000000..75ce4a5c
--- /dev/null
+++ b/visualizer/offload_visualizer.c
@@ -0,0 +1,1121 @@
+/*
+ * Copyright (C) 2013 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 "offload_visualizer"
+/*#define LOG_NDEBUG 0*/
+#include <assert.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <sys/prctl.h>
+
+#include <cutils/list.h>
+#include <cutils/log.h>
+#include <system/thread_defs.h>
+#include <tinyalsa/asoundlib.h>
+#include <audio_effects/effect_visualizer.h>
+
+
+enum {
+    EFFECT_STATE_UNINITIALIZED,
+    EFFECT_STATE_INITIALIZED,
+    EFFECT_STATE_ACTIVE,
+};
+
+typedef struct effect_context_s effect_context_t;
+
+/* effect specific operations. Only the init() and process() operations must be defined.
+ * Others are optional.
+ */
+typedef struct effect_ops_s {
+    int (*init)(effect_context_t *context);
+    int (*release)(effect_context_t *context);
+    int (*reset)(effect_context_t *context);
+    int (*enable)(effect_context_t *context);
+    int (*disable)(effect_context_t *context);
+    int (*process)(effect_context_t *context, audio_buffer_t *in, audio_buffer_t *out);
+    int (*set_parameter)(effect_context_t *context, effect_param_t *param, uint32_t size);
+    int (*get_parameter)(effect_context_t *context, effect_param_t *param, uint32_t *size);
+    int (*command)(effect_context_t *context, uint32_t cmdCode, uint32_t cmdSize,
+            void *pCmdData, uint32_t *replySize, void *pReplyData);
+} effect_ops_t;
+
+struct effect_context_s {
+    const struct effect_interface_s *itfe;
+    struct listnode effects_list_node;  /* node in created_effects_list */
+    struct listnode output_node;  /* node in output_context_t.effects_list */
+    effect_config_t config;
+    const effect_descriptor_t *desc;
+    audio_io_handle_t out_handle;  /* io handle of the output the effect is attached to */
+    uint32_t state;
+    bool offload_enabled;  /* when offload is enabled we process VISUALIZER_CMD_CAPTURE command.
+                              Otherwise non offloaded visualizer has already processed the command
+                              and we must not overwrite the reply. */
+    effect_ops_t ops;
+};
+
+typedef struct output_context_s {
+    struct listnode outputs_list_node;  /* node in active_outputs_list */
+    audio_io_handle_t handle; /* io handle */
+    struct listnode effects_list; /* list of effects attached to this output */
+} output_context_t;
+
+
+/* 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" */
+
+
+typedef struct visualizer_context_s {
+    effect_context_t common;
+
+    uint32_t capture_idx;
+    uint32_t capture_size;
+    uint32_t scaling_mode;
+    uint32_t last_capture_idx;
+    uint32_t latency;
+    struct timespec buffer_update_time;
+    uint8_t capture_buf[CAPTURE_BUF_SIZE];
+} visualizer_context_t;
+
+
+extern const struct effect_interface_s effect_interface;
+
+/* Offload visualizer UUID: 7a8044a0-1a71-11e3-a184-0002a5d5c51b */
+const effect_descriptor_t visualizer_descriptor = {
+        {0xe46b26a0, 0xdddd, 0x11db, 0x8afd, {0x00, 0x02, 0xa5, 0xd5, 0xc5, 0x1b}},
+        {0x7a8044a0, 0x1a71, 0x11e3, 0xa184, {0x00, 0x02, 0xa5, 0xd5, 0xc5, 0x1b}},
+        EFFECT_CONTROL_API_VERSION,
+        (EFFECT_FLAG_TYPE_INSERT | EFFECT_FLAG_HW_ACC_TUNNEL ),
+        0, /* TODO */
+        1,
+        "QCOM MSM offload visualizer",
+        "The Android Open Source Project",
+};
+
+const effect_descriptor_t *descriptors[] = {
+        &visualizer_descriptor,
+        NULL,
+};
+
+
+pthread_once_t once = PTHREAD_ONCE_INIT;
+int init_status;
+
+/* list of created effects. Updated by visualizer_hal_start_output()
+ * and visualizer_hal_stop_output() */
+struct listnode created_effects_list;
+/* list of active output streams. Updated by visualizer_hal_start_output()
+ * and visualizer_hal_stop_output() */
+struct listnode active_outputs_list;
+
+/* thread capturing PCM from Proxy port and calling the process function on each enabled effect
+ * attached to an active output stream */
+pthread_t capture_thread;
+/* lock must be held when modifying or accessing created_effects_list or active_outputs_list */
+pthread_mutex_t lock;
+/* thread_lock must be held when starting or stopping the capture thread.
+ * Locking order: thread_lock -> lock */
+pthread_mutex_t thread_lock;
+/* cond is signaled when an output is started or stopped or an effect is enabled or disable: the
+ * capture thread will reevaluate the capture and effect rocess conditions. */
+pthread_cond_t cond;
+/* true when requesting the capture thread to exit */
+bool exit_thread;
+/* 0 if the capture thread was created successfully */
+int thread_status;
+
+
+#define DSP_OUTPUT_LATENCY_MS 0 /* Fudge factor for latency after capture point in audio DSP */
+
+/* Retry for delay for mixer open */
+#define RETRY_NUMBER 10
+#define RETRY_US 500000
+
+#define MIXER_CARD 0
+#define SOUND_CARD 0
+#define CAPTURE_DEVICE 8
+
+/* Proxy port supports only MMAP read and those fixed parameters*/
+#define AUDIO_CAPTURE_CHANNEL_COUNT 2
+#define AUDIO_CAPTURE_SMP_RATE 48000
+#define AUDIO_CAPTURE_PERIOD_SIZE (768)
+#define AUDIO_CAPTURE_PERIOD_COUNT 32
+
+struct pcm_config pcm_config_capture = {
+    .channels = AUDIO_CAPTURE_CHANNEL_COUNT,
+    .rate = AUDIO_CAPTURE_SMP_RATE,
+    .period_size = AUDIO_CAPTURE_PERIOD_SIZE,
+    .period_count = AUDIO_CAPTURE_PERIOD_COUNT,
+    .format = PCM_FORMAT_S16_LE,
+    .start_threshold = AUDIO_CAPTURE_PERIOD_SIZE / 4,
+    .stop_threshold = INT_MAX,
+    .avail_min = AUDIO_CAPTURE_PERIOD_SIZE / 4,
+};
+
+
+/*
+ *  Local functions
+ */
+
+static void init_once() {
+    list_init(&created_effects_list);
+    list_init(&active_outputs_list);
+
+    pthread_mutex_init(&lock, NULL);
+    pthread_mutex_init(&thread_lock, NULL);
+    pthread_cond_init(&cond, NULL);
+    exit_thread = false;
+    thread_status = -1;
+
+    init_status = 0;
+}
+
+int lib_init() {
+    pthread_once(&once, init_once);
+    return init_status;
+}
+
+bool effect_exists(effect_context_t *context) {
+    struct listnode *node;
+
+    list_for_each(node, &created_effects_list) {
+        effect_context_t *fx_ctxt = node_to_item(node,
+                                                     effect_context_t,
+                                                     effects_list_node);
+        if (fx_ctxt == context) {
+            return true;
+        }
+    }
+    return false;
+}
+
+output_context_t *get_output(audio_io_handle_t output) {
+    struct listnode *node;
+
+    list_for_each(node, &active_outputs_list) {
+        output_context_t *out_ctxt = node_to_item(node,
+                                                  output_context_t,
+                                                  outputs_list_node);
+        if (out_ctxt->handle == output) {
+            return out_ctxt;
+        }
+    }
+    return NULL;
+}
+
+void add_effect_to_output(output_context_t * output, effect_context_t *context) {
+    struct listnode *fx_node;
+
+    list_for_each(fx_node, &output->effects_list) {
+        effect_context_t *fx_ctxt = node_to_item(fx_node,
+                                                     effect_context_t,
+                                                     output_node);
+        if (fx_ctxt == context)
+            return;
+    }
+    list_add_tail(&output->effects_list, &context->output_node);
+}
+
+void remove_effect_from_output(output_context_t * output, effect_context_t *context) {
+    struct listnode *fx_node;
+
+    list_for_each(fx_node, &output->effects_list) {
+        effect_context_t *fx_ctxt = node_to_item(fx_node,
+                                                     effect_context_t,
+                                                     output_node);
+        if (fx_ctxt == context) {
+            list_remove(&context->output_node);
+            return;
+        }
+    }
+}
+
+bool effects_enabled() {
+    struct listnode *out_node;
+
+    list_for_each(out_node, &active_outputs_list) {
+        struct listnode *fx_node;
+        output_context_t *out_ctxt = node_to_item(out_node,
+                                                  output_context_t,
+                                                  outputs_list_node);
+
+        list_for_each(fx_node, &out_ctxt->effects_list) {
+            effect_context_t *fx_ctxt = node_to_item(fx_node,
+                                                         effect_context_t,
+                                                         output_node);
+            if (fx_ctxt->state == EFFECT_STATE_ACTIVE)
+                return true;
+        }
+    }
+    return false;
+}
+
+int configure_proxy_capture(struct mixer *mixer, int value) {
+    const char *proxy_ctl_name = "AFE_PCM_RX Audio Mixer MultiMedia4";
+    struct mixer_ctl *ctl;
+
+    ctl = mixer_get_ctl_by_name(mixer, proxy_ctl_name);
+    if (ctl == NULL) {
+        ALOGW("%s: could not get %s ctl", __func__, proxy_ctl_name);
+        return -EINVAL;
+    }
+    if (mixer_ctl_set_value(ctl, 0, value) != 0)
+        ALOGW("%s: error setting value %d on %s ", __func__, value, proxy_ctl_name);
+
+    return 0;
+}
+
+
+void *capture_thread_loop(void *arg)
+{
+    int16_t data[AUDIO_CAPTURE_PERIOD_SIZE * AUDIO_CAPTURE_CHANNEL_COUNT * sizeof(int16_t)];
+    audio_buffer_t buf;
+    buf.frameCount = AUDIO_CAPTURE_PERIOD_SIZE;
+    buf.s16 = data;
+    bool capture_enabled = false;
+    struct mixer *mixer;
+    struct pcm *pcm = NULL;
+    int ret;
+    int retry_num = 0;
+
+    ALOGD("thread enter");
+
+    prctl(PR_SET_NAME, (unsigned long)"visualizer capture", 0, 0, 0);
+
+    pthread_mutex_lock(&lock);
+
+    mixer = mixer_open(MIXER_CARD);
+    while (mixer == NULL && retry_num < RETRY_NUMBER) {
+        usleep(RETRY_US);
+        mixer = mixer_open(MIXER_CARD);
+        retry_num++;
+    }
+    if (mixer == NULL) {
+        pthread_mutex_unlock(&lock);
+        return NULL;
+    }
+
+    for (;;) {
+        if (exit_thread) {
+            break;
+        }
+        if (effects_enabled()) {
+            if (!capture_enabled) {
+                ret = configure_proxy_capture(mixer, 1);
+                if (ret == 0) {
+                    pcm = pcm_open(SOUND_CARD, CAPTURE_DEVICE,
+                                   PCM_IN|PCM_MMAP|PCM_NOIRQ, &pcm_config_capture);
+                    if (pcm && !pcm_is_ready(pcm)) {
+                        ALOGW("%s: %s", __func__, pcm_get_error(pcm));
+                        pcm_close(pcm);
+                        pcm = NULL;
+                        configure_proxy_capture(mixer, 0);
+                    } else {
+                        capture_enabled = true;
+                        ALOGD("%s: capture ENABLED", __func__);
+                    }
+                }
+            }
+        } else {
+            if (capture_enabled) {
+                if (pcm != NULL)
+                    pcm_close(pcm);
+                configure_proxy_capture(mixer, 0);
+                ALOGD("%s: capture DISABLED", __func__);
+                capture_enabled = false;
+            }
+            pthread_cond_wait(&cond, &lock);
+        }
+        if (!capture_enabled)
+            continue;
+
+        pthread_mutex_unlock(&lock);
+        ret = pcm_mmap_read(pcm, data, sizeof(data));
+        pthread_mutex_lock(&lock);
+
+        if (ret == 0) {
+            struct listnode *out_node;
+
+            list_for_each(out_node, &active_outputs_list) {
+                output_context_t *out_ctxt = node_to_item(out_node,
+                                                          output_context_t,
+                                                          outputs_list_node);
+                struct listnode *fx_node;
+
+                list_for_each(fx_node, &out_ctxt->effects_list) {
+                    effect_context_t *fx_ctxt = node_to_item(fx_node,
+                                                                effect_context_t,
+                                                                output_node);
+                    fx_ctxt->ops.process(fx_ctxt, &buf, &buf);
+                }
+            }
+        } else {
+            ALOGW("%s: read status %d %s", __func__, ret, pcm_get_error(pcm));
+        }
+    }
+
+    if (capture_enabled) {
+        if (pcm != NULL)
+            pcm_close(pcm);
+        configure_proxy_capture(mixer, 0);
+    }
+    mixer_close(mixer);
+    pthread_mutex_unlock(&lock);
+
+    ALOGD("thread exit");
+
+    return NULL;
+}
+
+/*
+ * Interface from audio HAL
+ */
+
+__attribute__ ((visibility ("default")))
+int visualizer_hal_start_output(audio_io_handle_t output) {
+    int ret;
+    struct listnode *node;
+
+    ALOGV("%s", __func__);
+
+    if (lib_init() != 0)
+        return init_status;
+
+    pthread_mutex_lock(&thread_lock);
+    pthread_mutex_lock(&lock);
+    if (get_output(output) != NULL) {
+        ALOGW("%s output already started", __func__);
+        ret = -ENOSYS;
+        goto exit;
+    }
+
+    output_context_t *out_ctxt = (output_context_t *)malloc(sizeof(output_context_t));
+    out_ctxt->handle = output;
+    list_init(&out_ctxt->effects_list);
+
+    list_for_each(node, &created_effects_list) {
+        effect_context_t *fx_ctxt = node_to_item(node,
+                                                     effect_context_t,
+                                                     effects_list_node);
+        if (fx_ctxt->out_handle == output) {
+            list_add_tail(&out_ctxt->effects_list, &fx_ctxt->output_node);
+        }
+    }
+    if (list_empty(&active_outputs_list)) {
+        exit_thread = false;
+        thread_status = pthread_create(&capture_thread, (const pthread_attr_t *) NULL,
+                        capture_thread_loop, NULL);
+    }
+    list_add_tail(&active_outputs_list, &out_ctxt->outputs_list_node);
+    pthread_cond_signal(&cond);
+
+exit:
+    pthread_mutex_unlock(&lock);
+    pthread_mutex_unlock(&thread_lock);
+    return ret;
+}
+
+__attribute__ ((visibility ("default")))
+int visualizer_hal_stop_output(audio_io_handle_t output) {
+    int ret;
+    struct listnode *node;
+    output_context_t *out_ctxt;
+
+    ALOGV("%s", __func__);
+
+    if (lib_init() != 0)
+        return init_status;
+
+    pthread_mutex_lock(&thread_lock);
+    pthread_mutex_lock(&lock);
+
+    out_ctxt = get_output(output);
+    if (out_ctxt == NULL) {
+        ALOGW("%s output not started", __func__);
+        ret = -ENOSYS;
+        goto exit;
+    }
+
+    list_remove(&out_ctxt->outputs_list_node);
+    pthread_cond_signal(&cond);
+
+    if (list_empty(&active_outputs_list)) {
+        if (thread_status == 0) {
+            exit_thread = true;
+            pthread_cond_signal(&cond);
+            pthread_mutex_unlock(&lock);
+            pthread_join(capture_thread, (void **) NULL);
+            pthread_mutex_lock(&lock);
+            thread_status = -1;
+        }
+    }
+
+    free(out_ctxt);
+
+exit:
+    pthread_mutex_unlock(&lock);
+    pthread_mutex_unlock(&thread_lock);
+    return ret;
+}
+
+
+/*
+ * Effect operations
+ */
+
+int set_config(effect_context_t *context, effect_config_t *config)
+{
+    if (config->inputCfg.samplingRate != config->outputCfg.samplingRate) return -EINVAL;
+    if (config->inputCfg.channels != config->outputCfg.channels) return -EINVAL;
+    if (config->inputCfg.format != config->outputCfg.format) return -EINVAL;
+    if (config->inputCfg.channels != AUDIO_CHANNEL_OUT_STEREO) return -EINVAL;
+    if (config->outputCfg.accessMode != EFFECT_BUFFER_ACCESS_WRITE &&
+            config->outputCfg.accessMode != EFFECT_BUFFER_ACCESS_ACCUMULATE) return -EINVAL;
+    if (config->inputCfg.format != AUDIO_FORMAT_PCM_16_BIT) return -EINVAL;
+
+    context->config = *config;
+
+    if (context->ops.reset)
+        context->ops.reset(context);
+
+    return 0;
+}
+
+void get_config(effect_context_t *context, effect_config_t *config)
+{
+    *config = context->config;
+}
+
+
+/*
+ * Visualizer operations
+ */
+
+int visualizer_reset(effect_context_t *context)
+{
+    visualizer_context_t * visu_ctxt = (visualizer_context_t *)context;
+
+    visu_ctxt->capture_idx = 0;
+    visu_ctxt->last_capture_idx = 0;
+    visu_ctxt->buffer_update_time.tv_sec = 0;
+    visu_ctxt->latency = DSP_OUTPUT_LATENCY_MS;
+    memset(visu_ctxt->capture_buf, 0x80, CAPTURE_BUF_SIZE);
+    return 0;
+}
+
+int visualizer_init(effect_context_t *context)
+{
+    visualizer_context_t * visu_ctxt = (visualizer_context_t *)context;
+
+    context->config.inputCfg.accessMode = EFFECT_BUFFER_ACCESS_READ;
+    context->config.inputCfg.channels = AUDIO_CHANNEL_OUT_STEREO;
+    context->config.inputCfg.format = AUDIO_FORMAT_PCM_16_BIT;
+    context->config.inputCfg.samplingRate = 44100;
+    context->config.inputCfg.bufferProvider.getBuffer = NULL;
+    context->config.inputCfg.bufferProvider.releaseBuffer = NULL;
+    context->config.inputCfg.bufferProvider.cookie = NULL;
+    context->config.inputCfg.mask = EFFECT_CONFIG_ALL;
+    context->config.outputCfg.accessMode = EFFECT_BUFFER_ACCESS_ACCUMULATE;
+    context->config.outputCfg.channels = AUDIO_CHANNEL_OUT_STEREO;
+    context->config.outputCfg.format = AUDIO_FORMAT_PCM_16_BIT;
+    context->config.outputCfg.samplingRate = 44100;
+    context->config.outputCfg.bufferProvider.getBuffer = NULL;
+    context->config.outputCfg.bufferProvider.releaseBuffer = NULL;
+    context->config.outputCfg.bufferProvider.cookie = NULL;
+    context->config.outputCfg.mask = EFFECT_CONFIG_ALL;
+
+    visu_ctxt->capture_size = VISUALIZER_CAPTURE_SIZE_MAX;
+    visu_ctxt->scaling_mode = VISUALIZER_SCALING_MODE_NORMALIZED;
+
+    set_config(context, &context->config);
+
+    return 0;
+}
+
+int visualizer_get_parameter(effect_context_t *context, effect_param_t *p, uint32_t *size)
+{
+    visualizer_context_t *visu_ctxt = (visualizer_context_t *)context;
+
+    p->status = 0;
+    *size = sizeof(effect_param_t) + sizeof(uint32_t);
+    if (p->psize != sizeof(uint32_t)) {
+        p->status = -EINVAL;
+        return 0;
+    }
+    switch (*(uint32_t *)p->data) {
+    case VISUALIZER_PARAM_CAPTURE_SIZE:
+        ALOGV("%s get capture_size = %d", __func__, visu_ctxt->capture_size);
+        *((uint32_t *)p->data + 1) = visu_ctxt->capture_size;
+        p->vsize = sizeof(uint32_t);
+        *size += sizeof(uint32_t);
+        break;
+    case VISUALIZER_PARAM_SCALING_MODE:
+        ALOGV("%s get scaling_mode = %d", __func__, visu_ctxt->scaling_mode);
+        *((uint32_t *)p->data + 1) = visu_ctxt->scaling_mode;
+        p->vsize = sizeof(uint32_t);
+        *size += sizeof(uint32_t);
+        break;
+    default:
+        p->status = -EINVAL;
+    }
+    return 0;
+}
+
+int visualizer_set_parameter(effect_context_t *context, effect_param_t *p, uint32_t size)
+{
+    visualizer_context_t *visu_ctxt = (visualizer_context_t *)context;
+
+    if (p->psize != sizeof(uint32_t) || p->vsize != sizeof(uint32_t))
+        return -EINVAL;
+
+    switch (*(uint32_t *)p->data) {
+    case VISUALIZER_PARAM_CAPTURE_SIZE:
+        visu_ctxt->capture_size = *((uint32_t *)p->data + 1);
+        ALOGV("%s set capture_size = %d", __func__, visu_ctxt->capture_size);
+        break;
+    case VISUALIZER_PARAM_SCALING_MODE:
+        visu_ctxt->scaling_mode = *((uint32_t *)p->data + 1);
+        ALOGV("%s set scaling_mode = %d", __func__, visu_ctxt->scaling_mode);
+        break;
+    case VISUALIZER_PARAM_LATENCY:
+        /* Ignore latency as we capture at DSP output
+         * visu_ctxt->latency = *((uint32_t *)p->data + 1); */
+        ALOGV("%s set latency = %d", __func__, visu_ctxt->latency);
+        break;
+    default:
+        return -EINVAL;
+    }
+    return 0;
+}
+
+/* Real process function called from capture thread. Called with lock held */
+int visualizer_process(effect_context_t *context,
+                       audio_buffer_t *inBuffer,
+                       audio_buffer_t *outBuffer)
+{
+    visualizer_context_t *visu_ctxt = (visualizer_context_t *)context;
+
+    if (!effect_exists(context))
+        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 (visu_ctxt->scaling_mode == 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;
+        int i;
+        for (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(visu_ctxt->scaling_mode == VISUALIZER_SCALING_MODE_AS_PLAYED);
+        shift = 9;
+    }
+
+    uint32_t capt_idx;
+    uint32_t in_idx;
+    uint8_t *buf = visu_ctxt->capture_buf;
+    for (in_idx = 0, capt_idx = visu_ctxt->capture_idx;
+         in_idx < inBuffer->frameCount;
+         in_idx++, capt_idx++) {
+        if (capt_idx >= CAPTURE_BUF_SIZE) {
+            /* wrap around */
+            capt_idx = 0;
+        }
+        int32_t smp = inBuffer->s16[2 * in_idx] + inBuffer->s16[2 * in_idx + 1];
+        smp = smp >> shift;
+        buf[capt_idx] = ((uint8_t)smp)^0x80;
+    }
+
+    /* XXX the following two should really be atomic, though it probably doesn't
+     * matter much for visualization purposes */
+    visu_ctxt->capture_idx = capt_idx;
+    /* update last buffer update time stamp */
+    if (clock_gettime(CLOCK_MONOTONIC, &visu_ctxt->buffer_update_time) < 0) {
+        visu_ctxt->buffer_update_time.tv_sec = 0;
+    }
+
+    if (context->state != EFFECT_STATE_ACTIVE) {
+        ALOGV("%s DONE inactive", __func__);
+        return -ENODATA;
+    }
+
+    return 0;
+}
+
+int visualizer_command(effect_context_t * context, uint32_t cmdCode, uint32_t cmdSize,
+        void *pCmdData, uint32_t *replySize, void *pReplyData)
+{
+    visualizer_context_t * visu_ctxt = (visualizer_context_t *)context;
+
+    switch (cmdCode) {
+    case VISUALIZER_CMD_CAPTURE:
+        if (pReplyData == NULL || *replySize != visu_ctxt->capture_size) {
+            ALOGV("%s VISUALIZER_CMD_CAPTURE error *replySize %d context->capture_size %d",
+                  __func__, *replySize, visu_ctxt->capture_size);
+            return -EINVAL;
+        }
+
+        if (!context->offload_enabled)
+            break;
+
+        if (context->state == EFFECT_STATE_ACTIVE) {
+            int32_t latency_ms = visu_ctxt->latency;
+            uint32_t delta_ms = 0;
+            if (visu_ctxt->buffer_update_time.tv_sec != 0) {
+                struct timespec ts;
+                if (clock_gettime(CLOCK_MONOTONIC, &ts) == 0) {
+                    time_t secs = ts.tv_sec - visu_ctxt->buffer_update_time.tv_sec;
+                    long nsec = ts.tv_nsec - visu_ctxt->buffer_update_time.tv_nsec;
+                    if (nsec < 0) {
+                        --secs;
+                        nsec += 1000000000;
+                    }
+                    delta_ms = secs * 1000 + nsec / 1000000;
+                    latency_ms -= delta_ms;
+                    if (latency_ms < 0)
+                        latency_ms = 0;
+                }
+            }
+            uint32_t delta_smp = context->config.inputCfg.samplingRate * latency_ms / 1000;
+
+            int32_t capture_point = visu_ctxt->capture_idx - visu_ctxt->capture_size - delta_smp;
+            int32_t capture_size = visu_ctxt->capture_size;
+            if (capture_point < 0) {
+                int32_t size = -capture_point;
+                if (size > capture_size)
+                    size = capture_size;
+
+                memcpy(pReplyData,
+                       visu_ctxt->capture_buf + CAPTURE_BUF_SIZE + capture_point,
+                       size);
+                pReplyData = (void *)((size_t)pReplyData + size);
+                capture_size -= size;
+                capture_point = 0;
+            }
+            memcpy(pReplyData,
+                   visu_ctxt->capture_buf + capture_point,
+                   capture_size);
+
+
+            /* if audio framework has stopped playing audio although the effect is still
+             * active we must clear the capture buffer to return silence */
+            if ((visu_ctxt->last_capture_idx == visu_ctxt->capture_idx) &&
+                    (visu_ctxt->buffer_update_time.tv_sec != 0)) {
+                if (delta_ms > MAX_STALL_TIME_MS) {
+                    ALOGV("%s capture going to idle", __func__);
+                    visu_ctxt->buffer_update_time.tv_sec = 0;
+                    memset(pReplyData, 0x80, visu_ctxt->capture_size);
+                }
+            }
+            visu_ctxt->last_capture_idx = visu_ctxt->capture_idx;
+        } else {
+            memset(pReplyData, 0x80, visu_ctxt->capture_size);
+        }
+        break;
+
+    default:
+        ALOGW("%s invalid command %d", __func__, cmdCode);
+        return -EINVAL;
+    }
+    return 0;
+}
+
+
+/*
+ * Effect Library Interface Implementation
+ */
+
+int effect_lib_create(const effect_uuid_t *uuid,
+                         int32_t sessionId,
+                         int32_t ioId,
+                         effect_handle_t *pHandle) {
+    int ret;
+    int i;
+
+    if (lib_init() != 0)
+        return init_status;
+
+    if (pHandle == NULL || uuid == NULL)
+        return -EINVAL;
+
+    for (i = 0; descriptors[i] != NULL; i++) {
+        if (memcmp(uuid, &descriptors[i]->uuid, sizeof(effect_uuid_t)) == 0)
+            break;
+    }
+
+    if (descriptors[i] == NULL)
+        return -EINVAL;
+
+    effect_context_t *context;
+    if (memcmp(uuid, &visualizer_descriptor.uuid, sizeof(effect_uuid_t)) == 0) {
+        visualizer_context_t *visu_ctxt = (visualizer_context_t *)calloc(1,
+                                                                     sizeof(visualizer_context_t));
+        context = (effect_context_t *)visu_ctxt;
+        context->ops.init = visualizer_init;
+        context->ops.reset = visualizer_reset;
+        context->ops.process = visualizer_process;
+        context->ops.set_parameter = visualizer_set_parameter;
+        context->ops.get_parameter = visualizer_get_parameter;
+        context->ops.command = visualizer_command;
+    } else {
+        return -EINVAL;
+    }
+
+    context->itfe = &effect_interface;
+    context->state = EFFECT_STATE_UNINITIALIZED;
+    context->out_handle = (audio_io_handle_t)ioId;
+    context->desc = &visualizer_descriptor;
+
+    ret = context->ops.init(context);
+    if (ret < 0) {
+        ALOGW("%s init failed", __func__);
+        free(context);
+        return ret;
+    }
+
+    context->state = EFFECT_STATE_INITIALIZED;
+
+    pthread_mutex_lock(&lock);
+    list_add_tail(&created_effects_list, &context->effects_list_node);
+    output_context_t *out_ctxt = get_output(ioId);
+    if (out_ctxt != NULL)
+        add_effect_to_output(out_ctxt, context);
+    pthread_mutex_unlock(&lock);
+
+    *pHandle = (effect_handle_t)context;
+
+    ALOGV("%s created context %p", __func__, context);
+
+    return 0;
+
+}
+
+int effect_lib_release(effect_handle_t handle) {
+    effect_context_t *context = (effect_context_t *)handle;
+    int status;
+
+    if (lib_init() != 0)
+        return init_status;
+
+    ALOGV("%s context %p", __func__, handle);
+    pthread_mutex_lock(&lock);
+    status = -EINVAL;
+    if (effect_exists(context)) {
+        output_context_t *out_ctxt = get_output(context->out_handle);
+        if (out_ctxt != NULL)
+            remove_effect_from_output(out_ctxt, context);
+        list_remove(&context->effects_list_node);
+        if (context->ops.release)
+            context->ops.release(context);
+        free(context);
+        status = 0;
+    }
+    pthread_mutex_unlock(&lock);
+
+    return status;
+}
+
+int effect_lib_get_descriptor(const effect_uuid_t *uuid,
+                                effect_descriptor_t *descriptor) {
+    int i;
+
+    if (lib_init() != 0)
+        return init_status;
+
+    if (descriptor == NULL || uuid == NULL) {
+        ALOGV("%s called with NULL pointer", __func__);
+        return -EINVAL;
+    }
+
+    for (i = 0; descriptors[i] != NULL; i++) {
+        if (memcmp(uuid, &descriptors[i]->uuid, sizeof(effect_uuid_t)) == 0) {
+            *descriptor = *descriptors[i];
+            return 0;
+        }
+    }
+
+    return  -EINVAL;
+}
+
+/*
+ * Effect Control Interface Implementation
+ */
+
+ /* Stub function for effect interface: never called for offloaded effects */
+int effect_process(effect_handle_t self,
+                       audio_buffer_t *inBuffer,
+                       audio_buffer_t *outBuffer)
+{
+    effect_context_t * context = (effect_context_t *)self;
+    int status = 0;
+
+    ALOGW("%s Called ?????", __func__);
+
+    pthread_mutex_lock(&lock);
+    if (!effect_exists(context)) {
+        status = -EINVAL;
+        goto exit;
+    }
+
+    if (context->state != EFFECT_STATE_ACTIVE) {
+        status = -EINVAL;
+        goto exit;
+    }
+
+exit:
+    pthread_mutex_unlock(&lock);
+    return status;
+}
+
+int effect_command(effect_handle_t self, uint32_t cmdCode, uint32_t cmdSize,
+        void *pCmdData, uint32_t *replySize, void *pReplyData)
+{
+
+    effect_context_t * context = (effect_context_t *)self;
+    int retsize;
+    int status = 0;
+
+    pthread_mutex_lock(&lock);
+
+    if (!effect_exists(context)) {
+        status = -EINVAL;
+        goto exit;
+    }
+
+    if (context == NULL || context->state == EFFECT_STATE_UNINITIALIZED) {
+        status = -EINVAL;
+        goto exit;
+    }
+
+//    ALOGV_IF(cmdCode != VISUALIZER_CMD_CAPTURE,
+//             "%s command %d cmdSize %d", __func__, cmdCode, cmdSize);
+
+    switch (cmdCode) {
+    case EFFECT_CMD_INIT:
+        if (pReplyData == NULL || *replySize != sizeof(int)) {
+            status = -EINVAL;
+            goto exit;
+        }
+        if (context->ops.init)
+            *(int *) pReplyData = context->ops.init(context);
+        else
+            *(int *) pReplyData = 0;
+        break;
+    case EFFECT_CMD_SET_CONFIG:
+        if (pCmdData == NULL || cmdSize != sizeof(effect_config_t)
+                || pReplyData == NULL || *replySize != sizeof(int)) {
+            status = -EINVAL;
+            goto exit;
+        }
+        *(int *) pReplyData = set_config(context, (effect_config_t *) pCmdData);
+        break;
+    case EFFECT_CMD_GET_CONFIG:
+        if (pReplyData == NULL ||
+            *replySize != sizeof(effect_config_t)) {
+            status = -EINVAL;
+            goto exit;
+        }
+        if (!context->offload_enabled) {
+            status = -EINVAL;
+            goto exit;
+        }
+
+        get_config(context, (effect_config_t *)pReplyData);
+        break;
+    case EFFECT_CMD_RESET:
+        if (context->ops.reset)
+            context->ops.reset(context);
+        break;
+    case EFFECT_CMD_ENABLE:
+        if (pReplyData == NULL || *replySize != sizeof(int)) {
+            status = -EINVAL;
+            goto exit;
+        }
+        if (context->state != EFFECT_STATE_INITIALIZED) {
+            status = -ENOSYS;
+            goto exit;
+        }
+        context->state = EFFECT_STATE_ACTIVE;
+        if (context->ops.enable)
+            context->ops.enable(context);
+        pthread_cond_signal(&cond);
+        ALOGV("%s EFFECT_CMD_ENABLE", __func__);
+        *(int *)pReplyData = 0;
+        break;
+    case EFFECT_CMD_DISABLE:
+        if (pReplyData == NULL || *replySize != sizeof(int)) {
+            status = -EINVAL;
+            goto exit;
+        }
+        if (context->state != EFFECT_STATE_ACTIVE) {
+            status = -ENOSYS;
+            goto exit;
+        }
+        context->state = EFFECT_STATE_INITIALIZED;
+        if (context->ops.disable)
+            context->ops.disable(context);
+        pthread_cond_signal(&cond);
+        ALOGV("%s EFFECT_CMD_DISABLE", __func__);
+        *(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))) {
+            status = -EINVAL;
+            goto exit;
+        }
+        if (!context->offload_enabled) {
+            status = -EINVAL;
+            goto exit;
+        }
+        memcpy(pReplyData, pCmdData, sizeof(effect_param_t) + sizeof(uint32_t));
+        effect_param_t *p = (effect_param_t *)pReplyData;
+        if (context->ops.get_parameter)
+            context->ops.get_parameter(context, p, replySize);
+        } 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)) {
+            status = -EINVAL;
+            goto exit;
+        }
+        *(int32_t *)pReplyData = 0;
+        effect_param_t *p = (effect_param_t *)pCmdData;
+        if (context->ops.set_parameter)
+            *(int32_t *)pReplyData = context->ops.set_parameter(context, p, *replySize);
+
+        } break;
+    case EFFECT_CMD_SET_DEVICE:
+    case EFFECT_CMD_SET_VOLUME:
+    case EFFECT_CMD_SET_AUDIO_MODE:
+        break;
+
+    case EFFECT_CMD_OFFLOAD: {
+        output_context_t *out_ctxt;
+
+        if (cmdSize != sizeof(effect_offload_param_t) || pCmdData == NULL
+                || pReplyData == NULL || *replySize != sizeof(int)) {
+            ALOGV("%s EFFECT_CMD_OFFLOAD bad format", __func__);
+            status = -EINVAL;
+            break;
+        }
+
+        effect_offload_param_t* offload_param = (effect_offload_param_t*)pCmdData;
+
+        ALOGV("%s EFFECT_CMD_OFFLOAD offload %d output %d",
+              __func__, offload_param->isOffload, offload_param->ioHandle);
+
+        *(int *)pReplyData = 0;
+
+        context->offload_enabled = offload_param->isOffload;
+        if (context->out_handle == offload_param->ioHandle)
+            break;
+
+        out_ctxt = get_output(context->out_handle);
+        if (out_ctxt != NULL)
+            remove_effect_from_output(out_ctxt, context);
+        out_ctxt = get_output(offload_param->ioHandle);
+        if (out_ctxt != NULL)
+            add_effect_to_output(out_ctxt, context);
+
+        context->out_handle = offload_param->ioHandle;
+
+        } break;
+
+
+    default:
+        if (cmdCode >= EFFECT_CMD_FIRST_PROPRIETARY && context->ops.command)
+            status = context->ops.command(context, cmdCode, cmdSize,
+                                          pCmdData, replySize, pReplyData);
+        else {
+            ALOGW("%s invalid command %d", __func__, cmdCode);
+            status = -EINVAL;
+        }
+        break;
+    }
+
+exit:
+    pthread_mutex_unlock(&lock);
+
+//    ALOGV_IF(cmdCode != VISUALIZER_CMD_CAPTURE,"%s DONE", __func__);
+    return status;
+}
+
+/* Effect Control Interface Implementation: get_descriptor */
+int effect_get_descriptor(effect_handle_t   self,
+                                    effect_descriptor_t *descriptor)
+{
+    effect_context_t *context = (effect_context_t *)self;
+
+    if (!effect_exists(context))
+        return -EINVAL;
+
+    if (descriptor == NULL)
+        return -EINVAL;
+
+    *descriptor = *context->desc;
+
+    return 0;
+}
+
+/* effect_handle_t interface implementation for visualizer effect */
+const struct effect_interface_s effect_interface = {
+        effect_process,
+        effect_command,
+        effect_get_descriptor,
+        NULL,
+};
+
+__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 : effect_lib_create,
+    release_effect : effect_lib_release,
+    get_descriptor : effect_lib_get_descriptor,
+};