diff --git a/audio/2.0/IDevice.hal b/audio/2.0/IDevice.hal
index 38bfe211a4..630a32cf23 100644
--- a/audio/2.0/IDevice.hal
+++ b/audio/2.0/IDevice.hal
@@ -102,6 +102,8 @@ interface IDevice {
 
     /*
      * This method creates and opens the audio hardware output stream.
+     * If the stream can not be opened with the proposed audio config,
+     * HAL must provide suggested values for the audio config.
      *
      * @param ioHandle handle assigned by AudioFlinger.
      * @param device device type and (if needed) address.
@@ -109,15 +111,21 @@ interface IDevice {
      * @param flags additional flags.
      * @return retval operation completion status.
      * @return outStream created output stream.
+     * @return suggestedConfig in case of invalid parameters, suggested config.
      */
     openOutputStream(
             AudioIoHandle ioHandle,
             DeviceAddress device,
             AudioConfig config,
-            AudioOutputFlag flags) generates (Result retval, IStreamOut outStream);
+            AudioOutputFlag flags) generates (
+                    Result retval,
+                    IStreamOut outStream,
+                    AudioConfig suggestedConfig);
 
     /*
      * This method creates and opens the audio hardware input stream.
+     * If the stream can not be opened with the proposed audio config,
+     * HAL must provide suggested values for the audio config.
      *
      * @param ioHandle handle assigned by AudioFlinger.
      * @param device device type and (if needed) address.
@@ -125,14 +133,25 @@ interface IDevice {
      * @param flags additional flags.
      * @param source source specification.
      * @return retval operation completion status.
-     * @return inStream created input stream.
+     * @return inStream in case of success, created input stream.
+     * @return suggestedConfig in case of invalid parameters, suggested config.
      */
     openInputStream(
             AudioIoHandle ioHandle,
             DeviceAddress device,
             AudioConfig config,
             AudioInputFlag flags,
-            AudioSource source) generates (Result retval, IStreamIn inStream);
+            AudioSource source) generates (
+                    Result retval,
+                    IStreamIn inStream,
+                    AudioConfig suggestedConfig);
+
+    /*
+     * Returns whether HAL supports audio patches.
+     *
+     * @return supports true if audio patches are supported.
+     */
+    supportsAudioPatches() generates (bool supports);
 
     /*
      * Creates an audio patch between several source and sink ports.  The handle
diff --git a/audio/2.0/IStreamOut.hal b/audio/2.0/IStreamOut.hal
index 55a852d1ca..4ba3b2f194 100644
--- a/audio/2.0/IStreamOut.hal
+++ b/audio/2.0/IStreamOut.hal
@@ -90,10 +90,24 @@ interface IStreamOut extends IStream {
      * Calling this function implies that all future 'write' and 'drain'
      * must be non-blocking and use the callback to signal completion.
      *
+     * 'clearCallback' method needs to be called in order to release the local
+     * callback proxy on the server side and thus dereference the callback
+     * implementation on the client side.
+     *
      * @return retval operation completion status.
      */
     setCallback(IStreamOutCallback callback) generates (Result retval);
 
+    /*
+     * Clears the callback previously set via 'setCallback' method.
+     *
+     * Warning: failure to call this method results in callback implementation
+     * on the client side being held until the HAL server termination.
+     *
+     * @return retval operation completion status: OK or NOT_SUPPORTED.
+     */
+    clearCallback() generates (Result retval);
+
     /*
      * Returns whether HAL supports pausing and resuming of streams.
      *
diff --git a/audio/2.0/default/Conversions.cpp b/audio/2.0/default/Conversions.cpp
index 1ba16e1c61..e6691851bb 100644
--- a/audio/2.0/default/Conversions.cpp
+++ b/audio/2.0/default/Conversions.cpp
@@ -29,27 +29,31 @@ std::string deviceAddressToHal(const DeviceAddress& address) {
     char halAddress[AUDIO_DEVICE_MAX_ADDRESS_LEN];
     memset(halAddress, 0, sizeof(halAddress));
     uint32_t halDevice = static_cast<uint32_t>(address.device);
-    if ((halDevice & AUDIO_DEVICE_OUT_ALL_A2DP) != 0
-            || (halDevice & AUDIO_DEVICE_IN_BLUETOOTH_A2DP) != 0) {
+    const bool isInput = (halDevice & AUDIO_DEVICE_BIT_IN) != 0;
+    if (isInput) halDevice &= ~AUDIO_DEVICE_BIT_IN;
+    if ((!isInput && (halDevice & AUDIO_DEVICE_OUT_ALL_A2DP) != 0)
+            || (isInput && (halDevice & AUDIO_DEVICE_IN_BLUETOOTH_A2DP) != 0)) {
         snprintf(halAddress, sizeof(halAddress),
                 "%02X:%02X:%02X:%02X:%02X:%02X",
                 address.address.mac[0], address.address.mac[1], address.address.mac[2],
                 address.address.mac[3], address.address.mac[4], address.address.mac[5]);
-    } else if ((halDevice & AUDIO_DEVICE_OUT_IP) != 0 || (halDevice & AUDIO_DEVICE_IN_IP) != 0) {
+    } else if ((!isInput && (halDevice & AUDIO_DEVICE_OUT_IP) != 0)
+            || (isInput && (halDevice & AUDIO_DEVICE_IN_IP) != 0)) {
         snprintf(halAddress, sizeof(halAddress),
                 "%d.%d.%d.%d",
                 address.address.ipv4[0], address.address.ipv4[1],
                 address.address.ipv4[2], address.address.ipv4[3]);
-    } else if ((halDevice & AUDIO_DEVICE_OUT_ALL_USB) != 0
-            || (halDevice & AUDIO_DEVICE_IN_ALL_USB) != 0) {
+    } else if ((!isInput && (halDevice & AUDIO_DEVICE_OUT_ALL_USB) != 0)
+            || (isInput && (halDevice & AUDIO_DEVICE_IN_ALL_USB) != 0)) {
         snprintf(halAddress, sizeof(halAddress),
                 "card=%d;device=%d",
                 address.address.alsa.card, address.address.alsa.device);
-    } else if ((halDevice & AUDIO_DEVICE_OUT_BUS) != 0 || (halDevice & AUDIO_DEVICE_IN_BUS) != 0) {
+    } else if ((!isInput && (halDevice & AUDIO_DEVICE_OUT_BUS) != 0)
+            || (isInput && (halDevice & AUDIO_DEVICE_IN_BUS) != 0)) {
         snprintf(halAddress, sizeof(halAddress),
                 "%s", address.busAddress.c_str());
-    } else if ((halDevice & AUDIO_DEVICE_OUT_REMOTE_SUBMIX) != 0
-            || (halDevice & AUDIO_DEVICE_IN_REMOTE_SUBMIX) != 0) {
+    } else if ((!isInput && (halDevice & AUDIO_DEVICE_OUT_REMOTE_SUBMIX)) != 0
+            || (isInput && (halDevice & AUDIO_DEVICE_IN_REMOTE_SUBMIX) != 0)) {
         snprintf(halAddress, sizeof(halAddress),
                 "%s", address.rSubmixAddress.c_str());
     }
diff --git a/audio/2.0/default/Device.cpp b/audio/2.0/default/Device.cpp
index 339f371763..9c227f61c0 100644
--- a/audio/2.0/default/Device.cpp
+++ b/audio/2.0/default/Device.cpp
@@ -15,6 +15,7 @@
  */
 
 #define LOG_TAG "DeviceHAL"
+//#define LOG_NDEBUG 0
 
 #include <algorithm>
 #include <memory.h>
@@ -24,6 +25,7 @@
 
 #include "Conversions.h"
 #include "Device.h"
+#include "HidlUtils.h"
 #include "StreamIn.h"
 #include "StreamOut.h"
 
@@ -43,267 +45,6 @@ Device::~Device() {
     mDevice = nullptr;
 }
 
-// static
-void Device::audioConfigToHal(const AudioConfig& config, audio_config_t* halConfig) {
-    memset(halConfig, 0, sizeof(audio_config_t));
-    halConfig->sample_rate = config.sampleRateHz;
-    halConfig->channel_mask = static_cast<audio_channel_mask_t>(config.channelMask);
-    halConfig->format = static_cast<audio_format_t>(config.format);
-    audioOffloadInfoToHal(config.offloadInfo, &halConfig->offload_info);
-    halConfig->frame_count = config.frameCount;
-}
-
-// static
-void Device::audioGainConfigFromHal(
-        const struct audio_gain_config& halConfig, AudioGainConfig* config) {
-    config->index = halConfig.index;
-    config->mode = AudioGainMode(halConfig.mode);
-    config->channelMask = AudioChannelMask(halConfig.channel_mask);
-    for (size_t i = 0; i < sizeof(audio_channel_mask_t) * 8; ++i) {
-        config->values[i] = halConfig.values[i];
-    }
-    config->rampDurationMs = halConfig.ramp_duration_ms;
-}
-
-// static
-void Device::audioGainConfigToHal(
-        const AudioGainConfig& config, struct audio_gain_config* halConfig) {
-    halConfig->index = config.index;
-    halConfig->mode = static_cast<audio_gain_mode_t>(config.mode);
-    halConfig->channel_mask = static_cast<audio_channel_mask_t>(config.channelMask);
-    memset(halConfig->values, 0, sizeof(halConfig->values));
-    for (size_t i = 0; i < sizeof(audio_channel_mask_t) * 8; ++i) {
-        halConfig->values[i] = config.values[i];
-    }
-    halConfig->ramp_duration_ms = config.rampDurationMs;
-}
-
-// static
-void Device::audioGainFromHal(const struct audio_gain& halGain, AudioGain* gain) {
-    gain->mode = AudioGainMode(halGain.mode);
-    gain->channelMask = AudioChannelMask(halGain.channel_mask);
-    gain->minValue = halGain.min_value;
-    gain->maxValue = halGain.max_value;
-    gain->defaultValue = halGain.default_value;
-    gain->stepValue = halGain.step_value;
-    gain->minRampMs = halGain.min_ramp_ms;
-    gain->maxRampMs = halGain.max_ramp_ms;
-}
-
-// static
-void Device::audioGainToHal(const AudioGain& gain, struct audio_gain* halGain) {
-    halGain->mode = static_cast<audio_gain_mode_t>(gain.mode);
-    halGain->channel_mask = static_cast<audio_channel_mask_t>(gain.channelMask);
-    halGain->min_value = gain.minValue;
-    halGain->max_value = gain.maxValue;
-    halGain->default_value = gain.defaultValue;
-    halGain->step_value = gain.stepValue;
-    halGain->min_ramp_ms = gain.minRampMs;
-    halGain->max_ramp_ms = gain.maxRampMs;
-}
-
-// static
-void Device::audioOffloadInfoToHal(
-        const AudioOffloadInfo& offload, audio_offload_info_t* halOffload) {
-    *halOffload = AUDIO_INFO_INITIALIZER;
-    halOffload->sample_rate = offload.sampleRateHz;
-    halOffload->channel_mask = static_cast<audio_channel_mask_t>(offload.channelMask);
-    halOffload->stream_type = static_cast<audio_stream_type_t>(offload.streamType);
-    halOffload->bit_rate = offload.bitRatePerSecond;
-    halOffload->duration_us = offload.durationMicroseconds;
-    halOffload->has_video = offload.hasVideo;
-    halOffload->is_streaming = offload.isStreaming;
-}
-
-// static
-void Device::audioPortConfigFromHal(
-        const struct audio_port_config& halConfig, AudioPortConfig* config) {
-    config->id = halConfig.id;
-    config->role = AudioPortRole(halConfig.role);
-    config->type = AudioPortType(halConfig.type);
-    config->configMask = AudioPortConfigMask(halConfig.config_mask);
-    config->sampleRateHz = halConfig.sample_rate;
-    config->channelMask = AudioChannelMask(halConfig.channel_mask);
-    config->format = AudioFormat(halConfig.format);
-    audioGainConfigFromHal(halConfig.gain, &config->gain);
-    switch (halConfig.type) {
-        case AUDIO_PORT_TYPE_NONE: break;
-        case AUDIO_PORT_TYPE_DEVICE: {
-            config->ext.device.hwModule = halConfig.ext.device.hw_module;
-            config->ext.device.type = AudioDevice(halConfig.ext.device.type);
-            memcpy(config->ext.device.address.data(),
-                    halConfig.ext.device.address,
-                    AUDIO_DEVICE_MAX_ADDRESS_LEN);
-            break;
-        }
-        case AUDIO_PORT_TYPE_MIX: {
-            config->ext.mix.hwModule = halConfig.ext.mix.hw_module;
-            config->ext.mix.ioHandle = halConfig.ext.mix.handle;
-            if (halConfig.role == AUDIO_PORT_ROLE_SOURCE) {
-                config->ext.mix.useCase.source = AudioSource(halConfig.ext.mix.usecase.source);
-            } else if (halConfig.role == AUDIO_PORT_ROLE_SINK) {
-                config->ext.mix.useCase.stream = AudioStreamType(halConfig.ext.mix.usecase.stream);
-            }
-            break;
-        }
-        case AUDIO_PORT_TYPE_SESSION: {
-            config->ext.session.session = halConfig.ext.session.session;
-            break;
-        }
-    }
-}
-
-// static
-void Device::audioPortConfigToHal(
-        const AudioPortConfig& config, struct audio_port_config* halConfig) {
-    memset(halConfig, 0, sizeof(audio_port_config));
-    halConfig->id = config.id;
-    halConfig->role = static_cast<audio_port_role_t>(config.role);
-    halConfig->type = static_cast<audio_port_type_t>(config.type);
-    halConfig->config_mask = static_cast<unsigned int>(config.configMask);
-    halConfig->sample_rate = config.sampleRateHz;
-    halConfig->channel_mask = static_cast<audio_channel_mask_t>(config.channelMask);
-    halConfig->format = static_cast<audio_format_t>(config.format);
-    audioGainConfigToHal(config.gain, &halConfig->gain);
-    switch (config.type) {
-        case AudioPortType::NONE: break;
-        case AudioPortType::DEVICE: {
-            halConfig->ext.device.hw_module = config.ext.device.hwModule;
-            halConfig->ext.device.type = static_cast<audio_devices_t>(config.ext.device.type);
-            memcpy(halConfig->ext.device.address,
-                    config.ext.device.address.data(),
-                    AUDIO_DEVICE_MAX_ADDRESS_LEN);
-            break;
-        }
-        case AudioPortType::MIX: {
-            halConfig->ext.mix.hw_module = config.ext.mix.hwModule;
-            halConfig->ext.mix.handle = config.ext.mix.ioHandle;
-            if (config.role == AudioPortRole::SOURCE) {
-                halConfig->ext.mix.usecase.source =
-                        static_cast<audio_source_t>(config.ext.mix.useCase.source);
-            } else if (config.role == AudioPortRole::SINK) {
-                halConfig->ext.mix.usecase.stream =
-                        static_cast<audio_stream_type_t>(config.ext.mix.useCase.stream);
-            }
-            break;
-        }
-        case AudioPortType::SESSION: {
-            halConfig->ext.session.session =
-                    static_cast<audio_session_t>(config.ext.session.session);
-            break;
-        }
-    }
-}
-
-// static
-std::unique_ptr<audio_port_config[]> Device::audioPortConfigsToHal(
-        const hidl_vec<AudioPortConfig>& configs) {
-    std::unique_ptr<audio_port_config[]> halConfigs(new audio_port_config[configs.size()]);
-    for (size_t i = 0; i < configs.size(); ++i) {
-        audioPortConfigToHal(configs[i], &halConfigs[i]);
-    }
-    return halConfigs;
-}
-
-// static
-void Device::audioPortFromHal(const struct audio_port& halPort, AudioPort* port) {
-    port->id = halPort.id;
-    port->role = AudioPortRole(halPort.role);
-    port->type = AudioPortType(halPort.type);
-    port->name.setToExternal(halPort.name, strlen(halPort.name));
-    port->sampleRates.resize(halPort.num_sample_rates);
-    for (size_t i = 0; i < halPort.num_sample_rates; ++i) {
-        port->sampleRates[i] = halPort.sample_rates[i];
-    }
-    port->channelMasks.resize(halPort.num_channel_masks);
-    for (size_t i = 0; i < halPort.num_channel_masks; ++i) {
-        port->channelMasks[i] = AudioChannelMask(halPort.channel_masks[i]);
-    }
-    port->formats.resize(halPort.num_formats);
-    for (size_t i = 0; i < halPort.num_formats; ++i) {
-        port->formats[i] = AudioFormat(halPort.formats[i]);
-    }
-    port->gains.resize(halPort.num_gains);
-    for (size_t i = 0; i < halPort.num_gains; ++i) {
-        audioGainFromHal(halPort.gains[i], &port->gains[i]);
-    }
-    audioPortConfigFromHal(halPort.active_config, &port->activeConfig);
-    switch (halPort.type) {
-        case AUDIO_PORT_TYPE_NONE: break;
-        case AUDIO_PORT_TYPE_DEVICE: {
-            port->ext.device.hwModule = halPort.ext.device.hw_module;
-            port->ext.device.type = AudioDevice(halPort.ext.device.type);
-            memcpy(port->ext.device.address.data(),
-                    halPort.ext.device.address,
-                    AUDIO_DEVICE_MAX_ADDRESS_LEN);
-            break;
-        }
-        case AUDIO_PORT_TYPE_MIX: {
-            port->ext.mix.hwModule = halPort.ext.mix.hw_module;
-            port->ext.mix.ioHandle = halPort.ext.mix.handle;
-            port->ext.mix.latencyClass = AudioMixLatencyClass(halPort.ext.mix.latency_class);
-            break;
-        }
-        case AUDIO_PORT_TYPE_SESSION: {
-            port->ext.session.session = halPort.ext.session.session;
-            break;
-        }
-    }
-}
-
-// static
-void Device::audioPortToHal(const AudioPort& port, struct audio_port* halPort) {
-    memset(halPort, 0, sizeof(audio_port));
-    halPort->id = port.id;
-    halPort->role = static_cast<audio_port_role_t>(port.role);
-    halPort->type = static_cast<audio_port_type_t>(port.type);
-    memcpy(halPort->name,
-            port.name.c_str(),
-            std::min(port.name.size(), static_cast<size_t>(AUDIO_PORT_MAX_NAME_LEN)));
-    halPort->num_sample_rates =
-            std::min(port.sampleRates.size(), static_cast<size_t>(AUDIO_PORT_MAX_SAMPLING_RATES));
-    for (size_t i = 0; i < halPort->num_sample_rates; ++i) {
-        halPort->sample_rates[i] = port.sampleRates[i];
-    }
-    halPort->num_channel_masks =
-            std::min(port.channelMasks.size(), static_cast<size_t>(AUDIO_PORT_MAX_CHANNEL_MASKS));
-    for (size_t i = 0; i < halPort->num_channel_masks; ++i) {
-        halPort->channel_masks[i] = static_cast<audio_channel_mask_t>(port.channelMasks[i]);
-    }
-    halPort->num_formats =
-            std::min(port.formats.size(), static_cast<size_t>(AUDIO_PORT_MAX_FORMATS));
-    for (size_t i = 0; i < halPort->num_formats; ++i) {
-        halPort->formats[i] = static_cast<audio_format_t>(port.formats[i]);
-    }
-    halPort->num_gains = std::min(port.gains.size(), static_cast<size_t>(AUDIO_PORT_MAX_GAINS));
-    for (size_t i = 0; i < halPort->num_gains; ++i) {
-        audioGainToHal(port.gains[i], &halPort->gains[i]);
-    }
-    audioPortConfigToHal(port.activeConfig, &halPort->active_config);
-    switch (port.type) {
-        case AudioPortType::NONE: break;
-        case AudioPortType::DEVICE: {
-            halPort->ext.device.hw_module = port.ext.device.hwModule;
-            halPort->ext.device.type = static_cast<audio_devices_t>(port.ext.device.type);
-            memcpy(halPort->ext.device.address,
-                    port.ext.device.address.data(),
-                    AUDIO_DEVICE_MAX_ADDRESS_LEN);
-            break;
-        }
-        case AudioPortType::MIX: {
-            halPort->ext.mix.hw_module = port.ext.mix.hwModule;
-            halPort->ext.mix.handle = port.ext.mix.ioHandle;
-            halPort->ext.mix.latency_class =
-                    static_cast<audio_mix_latency_class_t>(port.ext.mix.latencyClass);
-            break;
-        }
-        case AudioPortType::SESSION: {
-            halPort->ext.session.session = static_cast<audio_session_t>(port.ext.session.session);
-            break;
-        }
-    }
-}
-
 Result Device::analyzeStatus(const char* funcName, int status) {
     if (status != 0) {
         ALOGW("Device %p %s: %s", mDevice, funcName, strerror(-status));
@@ -381,7 +122,7 @@ Return<void> Device::getMasterMute(getMasterMute_cb _hidl_cb)  {
 Return<void> Device::getInputBufferSize(
         const AudioConfig& config, getInputBufferSize_cb _hidl_cb)  {
     audio_config_t halConfig;
-    audioConfigToHal(config, &halConfig);
+    HidlUtils::audioConfigToHal(config, &halConfig);
     size_t halBufferSize = mDevice->get_input_buffer_size(mDevice, &halConfig);
     Result retval(Result::INVALID_ARGUMENTS);
     uint64_t bufferSize = 0;
@@ -400,8 +141,14 @@ Return<void> Device::openOutputStream(
         AudioOutputFlag flags,
         openOutputStream_cb _hidl_cb)  {
     audio_config_t halConfig;
-    audioConfigToHal(config, &halConfig);
+    HidlUtils::audioConfigToHal(config, &halConfig);
     audio_stream_out_t *halStream;
+    ALOGV("open_output_stream handle: %d devices: %x flags: %#x "
+            "srate: %d format %#x channels %x address %s",
+            ioHandle,
+            static_cast<audio_devices_t>(device.device), static_cast<audio_output_flags_t>(flags),
+            halConfig.sample_rate, halConfig.format, halConfig.channel_mask,
+            deviceAddressToHal(device).c_str());
     int status = mDevice->open_output_stream(
             mDevice,
             ioHandle,
@@ -410,11 +157,14 @@ Return<void> Device::openOutputStream(
             &halConfig,
             &halStream,
             deviceAddressToHal(device).c_str());
+    ALOGV("open_output_stream status %d stream %p", status, halStream);
     sp<IStreamOut> streamOut;
     if (status == OK) {
         streamOut = new StreamOut(mDevice, halStream);
     }
-    _hidl_cb(analyzeStatus("open_output_stream", status), streamOut);
+    AudioConfig suggestedConfig;
+    HidlUtils::audioConfigFromHal(halConfig, &suggestedConfig);
+    _hidl_cb(analyzeStatus("open_output_stream", status), streamOut, suggestedConfig);
     return Void();
 }
 
@@ -426,8 +176,14 @@ Return<void> Device::openInputStream(
         AudioSource source,
         openInputStream_cb _hidl_cb)  {
     audio_config_t halConfig;
-    audioConfigToHal(config, &halConfig);
+    HidlUtils::audioConfigToHal(config, &halConfig);
     audio_stream_in_t *halStream;
+    ALOGV("open_input_stream handle: %d devices: %x flags: %#x "
+            "srate: %d format %#x channels %x address %s source %d",
+            ioHandle,
+            static_cast<audio_devices_t>(device.device), static_cast<audio_input_flags_t>(flags),
+            halConfig.sample_rate, halConfig.format, halConfig.channel_mask,
+            deviceAddressToHal(device).c_str(), static_cast<audio_source_t>(source));
     int status = mDevice->open_input_stream(
             mDevice,
             ioHandle,
@@ -437,14 +193,21 @@ Return<void> Device::openInputStream(
             static_cast<audio_input_flags_t>(flags),
             deviceAddressToHal(device).c_str(),
             static_cast<audio_source_t>(source));
+    ALOGV("open_input_stream status %d stream %p", status, halStream);
     sp<IStreamIn> streamIn;
     if (status == OK) {
         streamIn = new StreamIn(mDevice, halStream);
     }
-    _hidl_cb(analyzeStatus("open_input_stream", status), streamIn);
+    AudioConfig suggestedConfig;
+    HidlUtils::audioConfigFromHal(halConfig, &suggestedConfig);
+    _hidl_cb(analyzeStatus("open_input_stream", status), streamIn, suggestedConfig);
     return Void();
 }
 
+Return<bool> Device::supportsAudioPatches() {
+    return version() >= AUDIO_DEVICE_API_VERSION_3_0;
+}
+
 Return<void> Device::createAudioPatch(
         const hidl_vec<AudioPortConfig>& sources,
         const hidl_vec<AudioPortConfig>& sinks,
@@ -452,8 +215,8 @@ Return<void> Device::createAudioPatch(
     Result retval(Result::NOT_SUPPORTED);
     AudioPatchHandle patch = 0;
     if (version() >= AUDIO_DEVICE_API_VERSION_3_0) {
-        std::unique_ptr<audio_port_config[]> halSources(audioPortConfigsToHal(sources));
-        std::unique_ptr<audio_port_config[]> halSinks(audioPortConfigsToHal(sinks));
+        std::unique_ptr<audio_port_config[]> halSources(HidlUtils::audioPortConfigsToHal(sources));
+        std::unique_ptr<audio_port_config[]> halSinks(HidlUtils::audioPortConfigsToHal(sinks));
         audio_patch_handle_t halPatch;
         retval = analyzeStatus(
                 "create_audio_patch",
@@ -481,11 +244,11 @@ Return<Result> Device::releaseAudioPatch(int32_t patch)  {
 
 Return<void> Device::getAudioPort(const AudioPort& port, getAudioPort_cb _hidl_cb)  {
     audio_port halPort;
-    audioPortToHal(port, &halPort);
+    HidlUtils::audioPortToHal(port, &halPort);
     Result retval = analyzeStatus("get_audio_port", mDevice->get_audio_port(mDevice, &halPort));
     AudioPort resultPort = port;
     if (retval == Result::OK) {
-        audioPortFromHal(halPort, &resultPort);
+        HidlUtils::audioPortFromHal(halPort, &resultPort);
     }
     _hidl_cb(retval, resultPort);
     return Void();
@@ -494,7 +257,7 @@ Return<void> Device::getAudioPort(const AudioPort& port, getAudioPort_cb _hidl_c
 Return<Result> Device::setAudioPortConfig(const AudioPortConfig& config)  {
     if (version() >= AUDIO_DEVICE_API_VERSION_3_0) {
         struct audio_port_config halPortConfig;
-        audioPortConfigToHal(config, &halPortConfig);
+        HidlUtils::audioPortConfigToHal(config, &halPortConfig);
         return analyzeStatus(
                 "set_audio_port_config", mDevice->set_audio_port_config(mDevice, &halPortConfig));
     }
diff --git a/audio/2.0/default/Device.h b/audio/2.0/default/Device.h
index 3fd67e39b7..a7d95a0a92 100644
--- a/audio/2.0/default/Device.h
+++ b/audio/2.0/default/Device.h
@@ -36,22 +36,13 @@ namespace V2_0 {
 namespace implementation {
 
 using ::android::hardware::audio::common::V2_0::AudioConfig;
-using ::android::hardware::audio::common::V2_0::AudioGain;
-using ::android::hardware::audio::common::V2_0::AudioGainConfig;
-using ::android::hardware::audio::common::V2_0::AudioGainMode;
 using ::android::hardware::audio::common::V2_0::AudioHwSync;
 using ::android::hardware::audio::common::V2_0::AudioInputFlag;
-using ::android::hardware::audio::common::V2_0::AudioMixLatencyClass;
-using ::android::hardware::audio::common::V2_0::AudioOffloadInfo;
 using ::android::hardware::audio::common::V2_0::AudioOutputFlag;
 using ::android::hardware::audio::common::V2_0::AudioPatchHandle;
 using ::android::hardware::audio::common::V2_0::AudioPort;
 using ::android::hardware::audio::common::V2_0::AudioPortConfig;
-using ::android::hardware::audio::common::V2_0::AudioPortConfigMask;
-using ::android::hardware::audio::common::V2_0::AudioPortRole;
-using ::android::hardware::audio::common::V2_0::AudioPortType;
 using ::android::hardware::audio::common::V2_0::AudioSource;
-using ::android::hardware::audio::common::V2_0::AudioStreamType;
 using ::android::hardware::audio::V2_0::DeviceAddress;
 using ::android::hardware::audio::V2_0::IDevice;
 using ::android::hardware::audio::V2_0::IStreamIn;
@@ -90,6 +81,7 @@ struct Device : public IDevice, public ParametersUtil {
             AudioInputFlag flags,
             AudioSource source,
             openInputStream_cb _hidl_cb)  override;
+    Return<bool> supportsAudioPatches()  override;
     Return<void> createAudioPatch(
             const hidl_vec<AudioPortConfig>& sources,
             const hidl_vec<AudioPortConfig>& sinks,
@@ -111,24 +103,6 @@ struct Device : public IDevice, public ParametersUtil {
   private:
     audio_hw_device_t *mDevice;
 
-    static void audioConfigToHal(const AudioConfig& config, audio_config_t* halConfig);
-    static void audioGainConfigFromHal(
-            const struct audio_gain_config& halConfig, AudioGainConfig* config);
-    static void audioGainConfigToHal(
-            const AudioGainConfig& config, struct audio_gain_config* halConfig);
-    static void audioGainFromHal(const struct audio_gain& halGain, AudioGain* gain);
-    static void audioGainToHal(const AudioGain& gain, struct audio_gain* halGain);
-    static void audioOffloadInfoToHal(
-            const AudioOffloadInfo& offload, audio_offload_info_t* halOffload);
-    static void audioPortConfigFromHal(
-            const struct audio_port_config& halConfig, AudioPortConfig* config);
-    static void audioPortConfigToHal(
-            const AudioPortConfig& config, struct audio_port_config* halConfig);
-    static std::unique_ptr<audio_port_config[]> audioPortConfigsToHal(
-            const hidl_vec<AudioPortConfig>& configs);
-    static void audioPortFromHal(const struct audio_port& halPort, AudioPort* port);
-    static void audioPortToHal(const AudioPort& port, struct audio_port* halPort);
-
     virtual ~Device();
 
     // Methods from ParametersUtil.
diff --git a/audio/2.0/default/PrimaryDevice.cpp b/audio/2.0/default/PrimaryDevice.cpp
index a8aa5ecd8a..905203b539 100644
--- a/audio/2.0/default/PrimaryDevice.cpp
+++ b/audio/2.0/default/PrimaryDevice.cpp
@@ -83,6 +83,10 @@ Return<void> PrimaryDevice::openInputStream(
     return mDevice->openInputStream(ioHandle, device, config, flags, source, _hidl_cb);
 }
 
+Return<bool> PrimaryDevice::supportsAudioPatches() {
+    return mDevice->supportsAudioPatches();
+}
+
 Return<void> PrimaryDevice::createAudioPatch(
         const hidl_vec<AudioPortConfig>& sources,
         const hidl_vec<AudioPortConfig>& sinks,
diff --git a/audio/2.0/default/PrimaryDevice.h b/audio/2.0/default/PrimaryDevice.h
index 968c208d52..db01fb3699 100644
--- a/audio/2.0/default/PrimaryDevice.h
+++ b/audio/2.0/default/PrimaryDevice.h
@@ -76,6 +76,7 @@ struct PrimaryDevice : public IPrimaryDevice {
             AudioInputFlag flags,
             AudioSource source,
             openInputStream_cb _hidl_cb)  override;
+    Return<bool> supportsAudioPatches()  override;
     Return<void> createAudioPatch(
             const hidl_vec<AudioPortConfig>& sources,
             const hidl_vec<AudioPortConfig>& sinks,
diff --git a/audio/2.0/default/StreamOut.cpp b/audio/2.0/default/StreamOut.cpp
index 21062565b2..4ee4961d3c 100644
--- a/audio/2.0/default/StreamOut.cpp
+++ b/audio/2.0/default/StreamOut.cpp
@@ -191,23 +191,27 @@ Return<Result> StreamOut::setCallback(const sp<IStreamOutCallback>& callback)  {
     return mStreamCommon->analyzeStatus("set_callback", result);
 }
 
+Return<Result> StreamOut::clearCallback()  {
+    if (mStream->set_callback == NULL) return Result::NOT_SUPPORTED;
+    mCallback.clear();
+    return Result::OK;
+}
+
 // static
 int StreamOut::asyncCallback(stream_callback_event_t event, void*, void *cookie) {
     wp<StreamOut> weakSelf(reinterpret_cast<StreamOut*>(cookie));
     sp<StreamOut> self = weakSelf.promote();
-    if (self == 0) return 0;
-    sp<IStreamOutCallback> callback = self->mCallback.promote();
-    if (callback == 0) return 0;
+    if (self == nullptr || self->mCallback == nullptr) return 0;
     ALOGV("asyncCallback() event %d", event);
     switch (event) {
         case STREAM_CBK_EVENT_WRITE_READY:
-            callback->onWriteReady();
+            self->mCallback->onWriteReady();
             break;
         case STREAM_CBK_EVENT_DRAIN_READY:
-            callback->onDrainReady();
+            self->mCallback->onDrainReady();
             break;
         case STREAM_CBK_EVENT_ERROR:
-            callback->onError();
+            self->mCallback->onError();
             break;
         default:
             ALOGW("asyncCallback() unknown event %d", event);
diff --git a/audio/2.0/default/StreamOut.h b/audio/2.0/default/StreamOut.h
index ca33b2dc84..b76214a543 100644
--- a/audio/2.0/default/StreamOut.h
+++ b/audio/2.0/default/StreamOut.h
@@ -83,6 +83,7 @@ struct StreamOut : public IStreamOut {
     Return<void> getRenderPosition(getRenderPosition_cb _hidl_cb)  override;
     Return<void> getNextWriteTimestamp(getNextWriteTimestamp_cb _hidl_cb)  override;
     Return<Result> setCallback(const sp<IStreamOutCallback>& callback)  override;
+    Return<Result> clearCallback()  override;
     Return<void> supportsPauseAndResume(supportsPauseAndResume_cb _hidl_cb)  override;
     Return<Result> pause()  override;
     Return<Result> resume()  override;
@@ -95,9 +96,7 @@ struct StreamOut : public IStreamOut {
     audio_hw_device_t *mDevice;
     audio_stream_out_t *mStream;
     sp<Stream> mStreamCommon;
-    // Do not store sp<> to avoid creating a reference loop if the entity that holds
-    // onto the output stream owns or implements the callback.
-    wp<IStreamOutCallback> mCallback;
+    sp<IStreamOutCallback> mCallback;
 
     virtual ~StreamOut();
 
diff --git a/audio/common/2.0/default/Android.mk b/audio/common/2.0/default/Android.mk
index aa60eb269f..8e2fed4744 100644
--- a/audio/common/2.0/default/Android.mk
+++ b/audio/common/2.0/default/Android.mk
@@ -20,10 +20,13 @@ include $(CLEAR_VARS)
 LOCAL_MODULE := android.hardware.audio.common@2.0-util
 LOCAL_SRC_FILES := \
     EffectMap.cpp \
+    HidlUtils.cpp \
 
 LOCAL_EXPORT_C_INCLUDE_DIRS := $(LOCAL_PATH)
 
 LOCAL_SHARED_LIBRARIES := \
     libutils \
+    libhidlbase \
+    android.hardware.audio.common@2.0 \
 
 include $(BUILD_SHARED_LIBRARY)
diff --git a/audio/common/2.0/default/HidlUtils.cpp b/audio/common/2.0/default/HidlUtils.cpp
new file mode 100644
index 0000000000..f25fc5ce5f
--- /dev/null
+++ b/audio/common/2.0/default/HidlUtils.cpp
@@ -0,0 +1,328 @@
+/*
+ * Copyright (C) 2016 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.
+ */
+
+#include <string.h>
+
+#include "HidlUtils.h"
+
+using ::android::hardware::audio::common::V2_0::AudioChannelMask;
+using ::android::hardware::audio::common::V2_0::AudioDevice;
+using ::android::hardware::audio::common::V2_0::AudioFormat;
+using ::android::hardware::audio::common::V2_0::AudioGainMode;
+using ::android::hardware::audio::common::V2_0::AudioMixLatencyClass;
+using ::android::hardware::audio::common::V2_0::AudioPortConfigMask;
+using ::android::hardware::audio::common::V2_0::AudioPortRole;
+using ::android::hardware::audio::common::V2_0::AudioPortType;
+using ::android::hardware::audio::common::V2_0::AudioSource;
+using ::android::hardware::audio::common::V2_0::AudioStreamType;
+
+namespace android {
+
+void HidlUtils::audioConfigFromHal(const audio_config_t& halConfig, AudioConfig* config) {
+    config->sampleRateHz = halConfig.sample_rate;
+    config->channelMask = AudioChannelMask(halConfig.channel_mask);
+    config->format = AudioFormat(halConfig.format);
+    audioOffloadInfoFromHal(halConfig.offload_info, &config->offloadInfo);
+    config->frameCount = halConfig.frame_count;
+}
+
+void HidlUtils::audioConfigToHal(const AudioConfig& config, audio_config_t* halConfig) {
+    memset(halConfig, 0, sizeof(audio_config_t));
+    halConfig->sample_rate = config.sampleRateHz;
+    halConfig->channel_mask = static_cast<audio_channel_mask_t>(config.channelMask);
+    halConfig->format = static_cast<audio_format_t>(config.format);
+    audioOffloadInfoToHal(config.offloadInfo, &halConfig->offload_info);
+    halConfig->frame_count = config.frameCount;
+}
+
+void HidlUtils::audioGainConfigFromHal(
+        const struct audio_gain_config& halConfig, AudioGainConfig* config) {
+    config->index = halConfig.index;
+    config->mode = AudioGainMode(halConfig.mode);
+    config->channelMask = AudioChannelMask(halConfig.channel_mask);
+    for (size_t i = 0; i < sizeof(audio_channel_mask_t) * 8; ++i) {
+        config->values[i] = halConfig.values[i];
+    }
+    config->rampDurationMs = halConfig.ramp_duration_ms;
+}
+
+void HidlUtils::audioGainConfigToHal(
+        const AudioGainConfig& config, struct audio_gain_config* halConfig) {
+    halConfig->index = config.index;
+    halConfig->mode = static_cast<audio_gain_mode_t>(config.mode);
+    halConfig->channel_mask = static_cast<audio_channel_mask_t>(config.channelMask);
+    memset(halConfig->values, 0, sizeof(halConfig->values));
+    for (size_t i = 0; i < sizeof(audio_channel_mask_t) * 8; ++i) {
+        halConfig->values[i] = config.values[i];
+    }
+    halConfig->ramp_duration_ms = config.rampDurationMs;
+}
+
+void HidlUtils::audioGainFromHal(const struct audio_gain& halGain, AudioGain* gain) {
+    gain->mode = AudioGainMode(halGain.mode);
+    gain->channelMask = AudioChannelMask(halGain.channel_mask);
+    gain->minValue = halGain.min_value;
+    gain->maxValue = halGain.max_value;
+    gain->defaultValue = halGain.default_value;
+    gain->stepValue = halGain.step_value;
+    gain->minRampMs = halGain.min_ramp_ms;
+    gain->maxRampMs = halGain.max_ramp_ms;
+}
+
+void HidlUtils::audioGainToHal(const AudioGain& gain, struct audio_gain* halGain) {
+    halGain->mode = static_cast<audio_gain_mode_t>(gain.mode);
+    halGain->channel_mask = static_cast<audio_channel_mask_t>(gain.channelMask);
+    halGain->min_value = gain.minValue;
+    halGain->max_value = gain.maxValue;
+    halGain->default_value = gain.defaultValue;
+    halGain->step_value = gain.stepValue;
+    halGain->min_ramp_ms = gain.minRampMs;
+    halGain->max_ramp_ms = gain.maxRampMs;
+}
+
+void HidlUtils::audioOffloadInfoFromHal(
+        const audio_offload_info_t& halOffload, AudioOffloadInfo* offload) {
+    offload->sampleRateHz = halOffload.sample_rate;
+    offload->channelMask = AudioChannelMask(halOffload.channel_mask);
+    offload->streamType = AudioStreamType(halOffload.stream_type);
+    offload->bitRatePerSecond = halOffload.bit_rate;
+    offload->durationMicroseconds = halOffload.duration_us;
+    offload->hasVideo = halOffload.has_video;
+    offload->isStreaming = halOffload.is_streaming;
+}
+
+void HidlUtils::audioOffloadInfoToHal(
+        const AudioOffloadInfo& offload, audio_offload_info_t* halOffload) {
+    *halOffload = AUDIO_INFO_INITIALIZER;
+    halOffload->sample_rate = offload.sampleRateHz;
+    halOffload->channel_mask = static_cast<audio_channel_mask_t>(offload.channelMask);
+    halOffload->stream_type = static_cast<audio_stream_type_t>(offload.streamType);
+    halOffload->bit_rate = offload.bitRatePerSecond;
+    halOffload->duration_us = offload.durationMicroseconds;
+    halOffload->has_video = offload.hasVideo;
+    halOffload->is_streaming = offload.isStreaming;
+}
+
+void HidlUtils::audioPortConfigFromHal(
+        const struct audio_port_config& halConfig, AudioPortConfig* config) {
+    config->id = halConfig.id;
+    config->role = AudioPortRole(halConfig.role);
+    config->type = AudioPortType(halConfig.type);
+    config->configMask = AudioPortConfigMask(halConfig.config_mask);
+    config->sampleRateHz = halConfig.sample_rate;
+    config->channelMask = AudioChannelMask(halConfig.channel_mask);
+    config->format = AudioFormat(halConfig.format);
+    audioGainConfigFromHal(halConfig.gain, &config->gain);
+    switch (halConfig.type) {
+        case AUDIO_PORT_TYPE_NONE: break;
+        case AUDIO_PORT_TYPE_DEVICE: {
+            config->ext.device.hwModule = halConfig.ext.device.hw_module;
+            config->ext.device.type = AudioDevice(halConfig.ext.device.type);
+            memcpy(config->ext.device.address.data(),
+                    halConfig.ext.device.address,
+                    AUDIO_DEVICE_MAX_ADDRESS_LEN);
+            break;
+        }
+        case AUDIO_PORT_TYPE_MIX: {
+            config->ext.mix.hwModule = halConfig.ext.mix.hw_module;
+            config->ext.mix.ioHandle = halConfig.ext.mix.handle;
+            if (halConfig.role == AUDIO_PORT_ROLE_SOURCE) {
+                config->ext.mix.useCase.source = AudioSource(halConfig.ext.mix.usecase.source);
+            } else if (halConfig.role == AUDIO_PORT_ROLE_SINK) {
+                config->ext.mix.useCase.stream = AudioStreamType(halConfig.ext.mix.usecase.stream);
+            }
+            break;
+        }
+        case AUDIO_PORT_TYPE_SESSION: {
+            config->ext.session.session = halConfig.ext.session.session;
+            break;
+        }
+    }
+}
+
+void HidlUtils::audioPortConfigToHal(
+        const AudioPortConfig& config, struct audio_port_config* halConfig) {
+    memset(halConfig, 0, sizeof(audio_port_config));
+    halConfig->id = config.id;
+    halConfig->role = static_cast<audio_port_role_t>(config.role);
+    halConfig->type = static_cast<audio_port_type_t>(config.type);
+    halConfig->config_mask = static_cast<unsigned int>(config.configMask);
+    halConfig->sample_rate = config.sampleRateHz;
+    halConfig->channel_mask = static_cast<audio_channel_mask_t>(config.channelMask);
+    halConfig->format = static_cast<audio_format_t>(config.format);
+    audioGainConfigToHal(config.gain, &halConfig->gain);
+    switch (config.type) {
+        case AudioPortType::NONE: break;
+        case AudioPortType::DEVICE: {
+            halConfig->ext.device.hw_module = config.ext.device.hwModule;
+            halConfig->ext.device.type = static_cast<audio_devices_t>(config.ext.device.type);
+            memcpy(halConfig->ext.device.address,
+                    config.ext.device.address.data(),
+                    AUDIO_DEVICE_MAX_ADDRESS_LEN);
+            break;
+        }
+        case AudioPortType::MIX: {
+            halConfig->ext.mix.hw_module = config.ext.mix.hwModule;
+            halConfig->ext.mix.handle = config.ext.mix.ioHandle;
+            if (config.role == AudioPortRole::SOURCE) {
+                halConfig->ext.mix.usecase.source =
+                        static_cast<audio_source_t>(config.ext.mix.useCase.source);
+            } else if (config.role == AudioPortRole::SINK) {
+                halConfig->ext.mix.usecase.stream =
+                        static_cast<audio_stream_type_t>(config.ext.mix.useCase.stream);
+            }
+            break;
+        }
+        case AudioPortType::SESSION: {
+            halConfig->ext.session.session =
+                    static_cast<audio_session_t>(config.ext.session.session);
+            break;
+        }
+    }
+}
+
+void HidlUtils::audioPortConfigsFromHal(
+        unsigned int numHalConfigs, const struct audio_port_config *halConfigs,
+        hidl_vec<AudioPortConfig> *configs) {
+    configs->resize(numHalConfigs);
+    for (unsigned int i = 0; i < numHalConfigs; ++i) {
+        audioPortConfigFromHal(halConfigs[i], &(*configs)[i]);
+    }
+}
+
+std::unique_ptr<audio_port_config[]> HidlUtils::audioPortConfigsToHal(
+        const hidl_vec<AudioPortConfig>& configs) {
+    std::unique_ptr<audio_port_config[]> halConfigs(new audio_port_config[configs.size()]);
+    for (size_t i = 0; i < configs.size(); ++i) {
+        audioPortConfigToHal(configs[i], &halConfigs[i]);
+    }
+    return halConfigs;
+}
+
+void HidlUtils::audioPortFromHal(const struct audio_port& halPort, AudioPort* port) {
+    port->id = halPort.id;
+    port->role = AudioPortRole(halPort.role);
+    port->type = AudioPortType(halPort.type);
+    port->name.setToExternal(halPort.name, strlen(halPort.name));
+    port->sampleRates.resize(halPort.num_sample_rates);
+    for (size_t i = 0; i < halPort.num_sample_rates; ++i) {
+        port->sampleRates[i] = halPort.sample_rates[i];
+    }
+    port->channelMasks.resize(halPort.num_channel_masks);
+    for (size_t i = 0; i < halPort.num_channel_masks; ++i) {
+        port->channelMasks[i] = AudioChannelMask(halPort.channel_masks[i]);
+    }
+    port->formats.resize(halPort.num_formats);
+    for (size_t i = 0; i < halPort.num_formats; ++i) {
+        port->formats[i] = AudioFormat(halPort.formats[i]);
+    }
+    port->gains.resize(halPort.num_gains);
+    for (size_t i = 0; i < halPort.num_gains; ++i) {
+        audioGainFromHal(halPort.gains[i], &port->gains[i]);
+    }
+    audioPortConfigFromHal(halPort.active_config, &port->activeConfig);
+    switch (halPort.type) {
+        case AUDIO_PORT_TYPE_NONE: break;
+        case AUDIO_PORT_TYPE_DEVICE: {
+            port->ext.device.hwModule = halPort.ext.device.hw_module;
+            port->ext.device.type = AudioDevice(halPort.ext.device.type);
+            memcpy(port->ext.device.address.data(),
+                    halPort.ext.device.address,
+                    AUDIO_DEVICE_MAX_ADDRESS_LEN);
+            break;
+        }
+        case AUDIO_PORT_TYPE_MIX: {
+            port->ext.mix.hwModule = halPort.ext.mix.hw_module;
+            port->ext.mix.ioHandle = halPort.ext.mix.handle;
+            port->ext.mix.latencyClass = AudioMixLatencyClass(halPort.ext.mix.latency_class);
+            break;
+        }
+        case AUDIO_PORT_TYPE_SESSION: {
+            port->ext.session.session = halPort.ext.session.session;
+            break;
+        }
+    }
+}
+
+void HidlUtils::audioPortToHal(const AudioPort& port, struct audio_port* halPort) {
+    memset(halPort, 0, sizeof(audio_port));
+    halPort->id = port.id;
+    halPort->role = static_cast<audio_port_role_t>(port.role);
+    halPort->type = static_cast<audio_port_type_t>(port.type);
+    memcpy(halPort->name,
+            port.name.c_str(),
+            std::min(port.name.size(), static_cast<size_t>(AUDIO_PORT_MAX_NAME_LEN)));
+    halPort->num_sample_rates =
+            std::min(port.sampleRates.size(), static_cast<size_t>(AUDIO_PORT_MAX_SAMPLING_RATES));
+    for (size_t i = 0; i < halPort->num_sample_rates; ++i) {
+        halPort->sample_rates[i] = port.sampleRates[i];
+    }
+    halPort->num_channel_masks =
+            std::min(port.channelMasks.size(), static_cast<size_t>(AUDIO_PORT_MAX_CHANNEL_MASKS));
+    for (size_t i = 0; i < halPort->num_channel_masks; ++i) {
+        halPort->channel_masks[i] = static_cast<audio_channel_mask_t>(port.channelMasks[i]);
+    }
+    halPort->num_formats =
+            std::min(port.formats.size(), static_cast<size_t>(AUDIO_PORT_MAX_FORMATS));
+    for (size_t i = 0; i < halPort->num_formats; ++i) {
+        halPort->formats[i] = static_cast<audio_format_t>(port.formats[i]);
+    }
+    halPort->num_gains = std::min(port.gains.size(), static_cast<size_t>(AUDIO_PORT_MAX_GAINS));
+    for (size_t i = 0; i < halPort->num_gains; ++i) {
+        audioGainToHal(port.gains[i], &halPort->gains[i]);
+    }
+    audioPortConfigToHal(port.activeConfig, &halPort->active_config);
+    switch (port.type) {
+        case AudioPortType::NONE: break;
+        case AudioPortType::DEVICE: {
+            halPort->ext.device.hw_module = port.ext.device.hwModule;
+            halPort->ext.device.type = static_cast<audio_devices_t>(port.ext.device.type);
+            memcpy(halPort->ext.device.address,
+                    port.ext.device.address.data(),
+                    AUDIO_DEVICE_MAX_ADDRESS_LEN);
+            break;
+        }
+        case AudioPortType::MIX: {
+            halPort->ext.mix.hw_module = port.ext.mix.hwModule;
+            halPort->ext.mix.handle = port.ext.mix.ioHandle;
+            halPort->ext.mix.latency_class =
+                    static_cast<audio_mix_latency_class_t>(port.ext.mix.latencyClass);
+            break;
+        }
+        case AudioPortType::SESSION: {
+            halPort->ext.session.session = static_cast<audio_session_t>(port.ext.session.session);
+            break;
+        }
+    }
+}
+
+void HidlUtils::uuidFromHal(const audio_uuid_t& halUuid, Uuid* uuid) {
+    uuid->timeLow = halUuid.timeLow;
+    uuid->timeMid = halUuid.timeMid;
+    uuid->versionAndTimeHigh = halUuid.timeHiAndVersion;
+    uuid->variantAndClockSeqHigh = halUuid.clockSeq;
+    memcpy(uuid->node.data(), halUuid.node, uuid->node.size());
+}
+
+void HidlUtils::uuidToHal(const Uuid& uuid, audio_uuid_t* halUuid) {
+    halUuid->timeLow = uuid.timeLow;
+    halUuid->timeMid = uuid.timeMid;
+    halUuid->timeHiAndVersion = uuid.versionAndTimeHigh;
+    halUuid->clockSeq = uuid.variantAndClockSeqHigh;
+    memcpy(halUuid->node, uuid.node.data(), uuid.node.size());
+}
+
+}  // namespace android
diff --git a/audio/common/2.0/default/HidlUtils.h b/audio/common/2.0/default/HidlUtils.h
new file mode 100644
index 0000000000..3fde4d7c8a
--- /dev/null
+++ b/audio/common/2.0/default/HidlUtils.h
@@ -0,0 +1,67 @@
+/*
+ * Copyright (C) 2016 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.
+ */
+
+#ifndef android_hardware_audio_V2_0_Hidl_Utils_H_
+#define android_hardware_audio_V2_0_Hidl_Utils_H_
+
+#include <memory>
+
+#include <android/hardware/audio/common/2.0/types.h>
+#include <system/audio.h>
+
+using ::android::hardware::audio::common::V2_0::AudioConfig;
+using ::android::hardware::audio::common::V2_0::AudioGain;
+using ::android::hardware::audio::common::V2_0::AudioGainConfig;
+using ::android::hardware::audio::common::V2_0::AudioOffloadInfo;
+using ::android::hardware::audio::common::V2_0::AudioPort;
+using ::android::hardware::audio::common::V2_0::AudioPortConfig;
+using ::android::hardware::audio::common::V2_0::Uuid;
+using ::android::hardware::hidl_vec;
+
+namespace android {
+
+class HidlUtils {
+  public:
+    static void audioConfigFromHal(const audio_config_t& halConfig, AudioConfig* config);
+    static void audioConfigToHal(const AudioConfig& config, audio_config_t* halConfig);
+    static void audioGainConfigFromHal(
+            const struct audio_gain_config& halConfig, AudioGainConfig* config);
+    static void audioGainConfigToHal(
+            const AudioGainConfig& config, struct audio_gain_config* halConfig);
+    static void audioGainFromHal(const struct audio_gain& halGain, AudioGain* gain);
+    static void audioGainToHal(const AudioGain& gain, struct audio_gain* halGain);
+    static void audioOffloadInfoFromHal(
+            const audio_offload_info_t& halOffload, AudioOffloadInfo* offload);
+    static void audioOffloadInfoToHal(
+            const AudioOffloadInfo& offload, audio_offload_info_t* halOffload);
+    static void audioPortConfigFromHal(
+            const struct audio_port_config& halConfig, AudioPortConfig* config);
+    static void audioPortConfigToHal(
+            const AudioPortConfig& config, struct audio_port_config* halConfig);
+    static void audioPortConfigsFromHal(
+            unsigned int numHalConfigs, const struct audio_port_config *halConfigs,
+            hidl_vec<AudioPortConfig> *configs);
+    static std::unique_ptr<audio_port_config[]> audioPortConfigsToHal(
+            const hidl_vec<AudioPortConfig>& configs);
+    static void audioPortFromHal(const struct audio_port& halPort, AudioPort* port);
+    static void audioPortToHal(const AudioPort& port, struct audio_port* halPort);
+    static void uuidFromHal(const audio_uuid_t& halUuid, Uuid* uuid);
+    static void uuidToHal(const Uuid& uuid, audio_uuid_t* halUuid);
+};
+
+}  // namespace android
+
+#endif  // android_hardware_audio_V2_0_Hidl_Utils_H_
diff --git a/audio/effect/2.0/default/Conversions.cpp b/audio/effect/2.0/default/Conversions.cpp
index ef2374cd80..e7d4c46388 100644
--- a/audio/effect/2.0/default/Conversions.cpp
+++ b/audio/effect/2.0/default/Conversions.cpp
@@ -18,6 +18,7 @@
 #include <stdio.h>
 
 #include "Conversions.h"
+#include "HidlUtils.h"
 
 namespace android {
 namespace hardware {
@@ -28,8 +29,8 @@ namespace implementation {
 
 void effectDescriptorFromHal(
         const effect_descriptor_t& halDescriptor, EffectDescriptor* descriptor) {
-    uuidFromHal(halDescriptor.type, &descriptor->type);
-    uuidFromHal(halDescriptor.uuid, &descriptor->uuid);
+    HidlUtils::uuidFromHal(halDescriptor.type, &descriptor->type);
+    HidlUtils::uuidFromHal(halDescriptor.uuid, &descriptor->uuid);
     descriptor->flags = EffectFlags(halDescriptor.flags);
     descriptor->cpuLoad = halDescriptor.cpuLoad;
     descriptor->memoryUsage = halDescriptor.memoryUsage;
@@ -38,22 +39,6 @@ void effectDescriptorFromHal(
             halDescriptor.implementor, descriptor->implementor.size());
 }
 
-void uuidFromHal(const effect_uuid_t& halUuid, Uuid* uuid) {
-    uuid->timeLow = halUuid.timeLow;
-    uuid->timeMid = halUuid.timeMid;
-    uuid->versionAndTimeHigh = halUuid.timeHiAndVersion;
-    uuid->variantAndClockSeqHigh = halUuid.clockSeq;
-    memcpy(uuid->node.data(), halUuid.node, uuid->node.size());
-}
-
-void uuidToHal(const Uuid& uuid, effect_uuid_t* halUuid) {
-    halUuid->timeLow = uuid.timeLow;
-    halUuid->timeMid = uuid.timeMid;
-    halUuid->timeHiAndVersion = uuid.versionAndTimeHigh;
-    halUuid->clockSeq = uuid.variantAndClockSeqHigh;
-    memcpy(halUuid->node, uuid.node.data(), uuid.node.size());
-}
-
 std::string uuidToString(const effect_uuid_t& halUuid) {
     char str[64];
     snprintf(str, sizeof(str), "%08x-%04x-%04x-%04x-%02x%02x%02x%02x%02x%02x",
diff --git a/audio/effect/2.0/default/Conversions.h b/audio/effect/2.0/default/Conversions.h
index 5348ae6686..7cef362c35 100644
--- a/audio/effect/2.0/default/Conversions.h
+++ b/audio/effect/2.0/default/Conversions.h
@@ -29,13 +29,10 @@ namespace effect {
 namespace V2_0 {
 namespace implementation {
 
-using ::android::hardware::audio::common::V2_0::Uuid;
 using ::android::hardware::audio::effect::V2_0::EffectDescriptor;
 
 void effectDescriptorFromHal(
         const effect_descriptor_t& halDescriptor, EffectDescriptor* descriptor);
-void uuidFromHal(const effect_uuid_t& halUuid, Uuid* uuid);
-void uuidToHal(const Uuid& uuid, effect_uuid_t* halUuid);
 std::string uuidToString(const effect_uuid_t& halUuid);
 
 } // namespace implementation
diff --git a/audio/effect/2.0/default/Effect.cpp b/audio/effect/2.0/default/Effect.cpp
index 82d0292d4e..6553da4767 100644
--- a/audio/effect/2.0/default/Effect.cpp
+++ b/audio/effect/2.0/default/Effect.cpp
@@ -14,7 +14,6 @@
  * limitations under the License.
  */
 
-#include <memory>
 #include <memory.h>
 
 #define LOG_TAG "EffectHAL"
@@ -56,10 +55,15 @@ template<typename T> size_t Effect::alignedSizeIn(size_t s) {
 }
 
 // static
-template<typename T> void Effect::hidlVecToHal(
-        const hidl_vec<T>& vec, uint32_t* halDataSize, void** halData) {
-    *halDataSize = static_cast<T>(vec.size() * sizeof(T));
-    *halData = static_cast<void*>(const_cast<T*>(&vec[0]));
+template<typename T> std::unique_ptr<uint8_t[]> Effect::hidlVecToHal(
+        const hidl_vec<T>& vec, uint32_t* halDataSize) {
+    // Due to bugs in HAL, they may attempt to write into the provided
+    // input buffer. The original binder buffer is r/o, thus it is needed
+    // to create a r/w version.
+    *halDataSize = vec.size() * sizeof(T);
+    std::unique_ptr<uint8_t[]> halData(new uint8_t[*halDataSize]);
+    memcpy(&halData[0], &vec[0], *halDataSize);
+    return halData;
 }
 
 // static
@@ -393,12 +397,13 @@ Return<Result> Effect::setDevice(AudioDevice device)  {
 Return<void> Effect::setAndGetVolume(
         const hidl_vec<uint32_t>& volumes, setAndGetVolume_cb _hidl_cb)  {
     uint32_t halDataSize;
-    void *halData;
-    hidlVecToHal(volumes, &halDataSize, &halData);
+    std::unique_ptr<uint8_t[]> halData = hidlVecToHal(volumes, &halDataSize);
     uint32_t halResultSize = halDataSize;
     uint32_t halResult[volumes.size()];
     Result retval = sendCommandReturningData(
-            EFFECT_CMD_SET_VOLUME, "SET_VOLUME", halDataSize, halData, &halResultSize, halResult);
+            EFFECT_CMD_SET_VOLUME, "SET_VOLUME",
+            halDataSize, &halData[0],
+            &halResultSize, halResult);
     hidl_vec<uint32_t> result;
     if (retval == Result::OK) {
         result.setToExternal(&halResult[0], halResultSize);
@@ -528,13 +533,12 @@ Return<void> Effect::command(
         uint32_t resultMaxSize,
         command_cb _hidl_cb)  {
     uint32_t halDataSize;
-    void *halData;
-    hidlVecToHal(data, &halDataSize, &halData);
+    std::unique_ptr<uint8_t[]> halData = hidlVecToHal(data, &halDataSize);
     uint32_t halResultSize = resultMaxSize;
     std::unique_ptr<uint8_t[]> halResult(new uint8_t[halResultSize]);
     memset(&halResult[0], 0, halResultSize);
     status_t status = (*mHandle)->command(
-            mHandle, commandId, halDataSize, halData, &halResultSize, &halResult[0]);
+            mHandle, commandId, halDataSize, &halData[0], &halResultSize, &halResult[0]);
     hidl_vec<uint8_t> result;
     if (status == OK) {
         result.setToExternal(&halResult[0], halResultSize);
diff --git a/audio/effect/2.0/default/Effect.h b/audio/effect/2.0/default/Effect.h
index e27a7e4c6e..ff57051c21 100644
--- a/audio/effect/2.0/default/Effect.h
+++ b/audio/effect/2.0/default/Effect.h
@@ -17,6 +17,7 @@
 #ifndef HIDL_GENERATED_android_hardware_audio_effect_V2_0_Effect_H_
 #define HIDL_GENERATED_android_hardware_audio_effect_V2_0_Effect_H_
 
+#include <memory>
 #include <vector>
 
 #include <android/hardware/audio/effect/2.0/IEffect.h>
@@ -180,8 +181,8 @@ struct Effect : public IEffect {
     virtual ~Effect();
 
     template<typename T> static size_t alignedSizeIn(size_t s);
-    template<typename T> static void hidlVecToHal(
-            const hidl_vec<T>& vec, uint32_t* halDataSize, void** halData);
+    template<typename T> std::unique_ptr<uint8_t[]> hidlVecToHal(
+            const hidl_vec<T>& vec, uint32_t* halDataSize);
     static void effectAuxChannelsConfigFromHal(
             const channel_config_t& halConfig, EffectAuxChannelsConfig* config);
     static void effectAuxChannelsConfigToHal(
diff --git a/audio/effect/2.0/default/EffectsFactory.cpp b/audio/effect/2.0/default/EffectsFactory.cpp
index 2b5d70ba2b..2bfe6af573 100644
--- a/audio/effect/2.0/default/EffectsFactory.cpp
+++ b/audio/effect/2.0/default/EffectsFactory.cpp
@@ -33,8 +33,9 @@
 #include "AutomaticGainControlEffect.h"
 #include "BassBoostEffect.h"
 #include "Conversions.h"
-#include "EffectsFactory.h"
 #include "DownmixEffect.h"
+#include "EffectsFactory.h"
+#include "HidlUtils.h"
 #include "Effect.h"
 #include "EffectMap.h"
 #include "EnvironmentalReverbEffect.h"
@@ -131,7 +132,7 @@ exit:
 
 Return<void> EffectsFactory::getDescriptor(const Uuid& uid, getDescriptor_cb _hidl_cb)  {
     effect_uuid_t halUuid;
-    uuidToHal(uid, &halUuid);
+    HidlUtils::uuidToHal(uid, &halUuid);
     effect_descriptor_t halDescriptor;
     status_t status = EffectGetDescriptor(&halUuid, &halDescriptor);
     EffectDescriptor descriptor;
@@ -153,7 +154,7 @@ Return<void> EffectsFactory::getDescriptor(const Uuid& uid, getDescriptor_cb _hi
 Return<void> EffectsFactory::createEffect(
         const Uuid& uid, int32_t session, int32_t ioHandle, createEffect_cb _hidl_cb)  {
     effect_uuid_t halUuid;
-    uuidToHal(uid, &halUuid);
+    HidlUtils::uuidToHal(uid, &halUuid);
     effect_handle_t handle;
     Result retval(Result::OK);
     status_t status = EffectCreate(&halUuid, session, ioHandle, &handle);