qahw/inc/qahw.h - LeafOS-Project/android_hardware_qcom_audio - Gitiles

 /*
  * Copyright (c) 2016-2018, The Linux Foundation. All rights reserved.
  * Not a Contribution.
  *
  * Copyright (C) 2011 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 QTI_AUDIO_QAHW_H
 #define QTI_AUDIO_QAHW_H

 #include <stdint.h>
 #include <strings.h>
 #include <sys/cdefs.h>
 #include <sys/types.h>
 #include <sys/time.h>
 #include <cutils/bitops.h>
 #include <system/audio.h>
 #include "qahw_defs.h"
 #include "qahw_effect_api.h"

 __BEGIN_DECLS

 /*
  * Helper macros for module implementors.
  *
  * The derived modules should provide convenience macros for supported
  * versions so that implementations can explicitly specify module
  * versions at definition time.
  */

 #define QAHW_MAKE_API_VERSION(maj,min) \
             ((((maj) & 0xff) << 8) | ((min) & 0xff))

 /* First generation of audio devices had version hardcoded to 0. all devices with
  * versions < 1.0 will be considered of first generation API.
  */
 #define QAHW_MODULE_API_VERSION_0_0 QAHW_MAKE_API_VERSION(0, 0)

 /* Minimal QTI audio HAL version supported by the audio framework */
 #define QAHW_MODULE_API_VERSION_MIN QAHW_MODULE_API_VERSION_0_0

 /**
  * List of known audio HAL modules. This is the base name of the audio HAL
  * library composed of the "audio." prefix, one of the base names below and
  * a suffix specific to the device.
  * e.g: audio.primary.goldfish.so or audio.a2dp.default.so
  */

 #define QAHW_MODULE_ID_PRIMARY     "audio.primary"
 #define QAHW_MODULE_ID_A2DP        "audio.a2dp"
 #define QAHW_MODULE_ID_USB         "audio.usb"

 typedef void qahw_module_handle_t;
 typedef void qahw_stream_handle_t;

 #ifdef __cplusplus
 extern "C"
 {
 #endif
 /**************************************/
 /* Output stream specific APIs **/

 /*
  * This method creates and opens the audio hardware output stream.
  * The "address" parameter qualifies the "devices" audio device type if needed.
  * The format format depends on the device type:
  * - Bluetooth devices use the MAC address of the device in the form "00:11:22:AA:BB:CC"
  * - USB devices use the ALSA card and device numbers in the form  "card=X;device=Y"
  * - Other devices may use a number or any other string.
  */

 int qahw_open_output_stream_l(qahw_module_handle_t *hw_module,
                             audio_io_handle_t handle,
                             audio_devices_t devices,
                             audio_output_flags_t flags,
                             struct audio_config *config,
                             qahw_stream_handle_t **out_handle,
                             const char *address);

 int qahw_close_output_stream_l(qahw_stream_handle_t *out_handle);

 /*
  * Return the sampling rate in Hz - eg. 44100.
  */
 uint32_t qahw_out_get_sample_rate_l(const qahw_stream_handle_t *stream);

 /*
  *  use set_parameters with key QAHW_PARAMETER_STREAM_SAMPLING_RATE
  */
 int qahw_out_set_sample_rate_l(qahw_stream_handle_t *stream, uint32_t rate);

 /*
  * Return size of input/output buffer in bytes for this stream - eg. 4800.
  * It should be a multiple of the frame size.  See also get_input_buffer_size.
  */
 size_t qahw_out_get_buffer_size_l(const qahw_stream_handle_t *stream);

 /*
  * Return the channel mask -
  *  e.g. AUDIO_CHANNEL_OUT_STEREO or AUDIO_CHANNEL_IN_STEREO
  */
 audio_channel_mask_t qahw_out_get_channels_l(const qahw_stream_handle_t *stream);

 /*
  * Return the audio format - e.g. AUDIO_FORMAT_PCM_16_BIT
  */
 audio_format_t qahw_out_get_format_l(const qahw_stream_handle_t *stream);

 /*
  * Put the audio hardware input/output into standby mode.
  * Driver should exit from standby mode at the next I/O operation.
  * Returns 0 on success and <0 on failure.
  */
 int qahw_out_standby_l(qahw_stream_handle_t *stream);

 /*
  * set/get audio stream parameters. The function accepts a list of
  * parameter key value pairs in the form: key1=value1;key2=value2;...
  *
  * Some keys are reserved for standard parameters (See AudioParameter class)
  *
  * If the implementation does not accept a parameter change while
  * the output is active but the parameter is acceptable otherwise, it must
  * return -ENOSYS.
  *
  * The audio flinger will put the stream in standby and then change the
  * parameter value.
  */
 int qahw_out_set_parameters_l(qahw_stream_handle_t *stream, const char*kv_pairs);

 /*
  * Returns a pointer to a heap allocated string. The caller is responsible
  * for freeing the memory for it using free().
  */
 char* qahw_out_get_parameters_l(const qahw_stream_handle_t *stream,
                                const char *keys);

 /* API to set playback stream specific config parameters */
 int qahw_out_set_param_data_l(qahw_stream_handle_t *out_handle,
                             qahw_param_id param_id,
                             qahw_param_payload *payload);

 /* API to get playback stream specific config parameters */
 int qahw_out_get_param_data_l(qahw_stream_handle_t *out_handle,
                             qahw_param_id param_id,
                             qahw_param_payload *payload);

 /*
  * Return the audio hardware driver estimated latency in milliseconds.
  */
 uint32_t qahw_out_get_latency_l(const qahw_stream_handle_t *stream);

 /*
  * Use this method in situations where audio mixing is done in the
  * hardware. This method serves as a direct interface with hardware,
  * allowing you to directly set the volume as apposed to via the framework.
  * This method might produce multiple PCM outputs or hardware accelerated
  * codecs, such as MP3 or AAC.
  */
 int qahw_out_set_volume_l(qahw_stream_handle_t *stream, float left, float right);

 /*
  * Write audio buffer present in meta_data starting from offset
  * along with timestamp to driver. Returns number of bytes
  * written or a negative status_t. If at least one frame was written successfully
  * prior to the error, it is suggested that the driver return that successful
  * (short) byte count and then return an error in the subsequent call.
  * timestamp is only sent driver is session has been opened with timestamp flag
  * otherwise its ignored.
  *
  * If set_callback() has previously been called to enable non-blocking mode
  * the write() is not allowed to block. It must write only the number of
  * bytes that currently fit in the driver/hardware buffer and then return
  * this byte count. If this is less than the requested write size the
  * callback function must be called when more space is available in the
  * driver/hardware buffer.
  */
 ssize_t qahw_out_write_l(qahw_stream_handle_t *stream,
                        qahw_out_buffer_t *out_buf);

 /*
  * return the number of audio frames written by the audio dsp to DAC since
  * the output has exited standby
  */
 int qahw_out_get_render_position_l(const qahw_stream_handle_t *stream,
                                  uint32_t *dsp_frames);

 /*
  * set the callback function for notifying completion of non-blocking
  * write and drain.
  * Calling this function implies that all future rite() and drain()
  * must be non-blocking and use the callback to signal completion.
  */
 int qahw_out_set_callback_l(qahw_stream_handle_t *stream,
                           qahw_stream_callback_t callback,
                           void *cookie);

 /*
  * Notifies to the audio driver to stop playback however the queued buffers are
  * retained by the hardware. Useful for implementing pause/resume. Empty implementation
  * if not supported however should be implemented for hardware with non-trivial
  * latency. In the pause state audio hardware could still be using power. User may
  * consider calling suspend after a timeout.
  *
  * Implementation of this function is mandatory for offloaded playback.
  */
 int qahw_out_pause_l(qahw_stream_handle_t *out_handle);

 /*
  * Notifies to the audio driver to resume playback following a pause.
  * Returns error if called without matching pause.
  *
  * Implementation of this function is mandatory for offloaded playback.
  */
 int qahw_out_resume_l(qahw_stream_handle_t *out_handle);

 /*
  * Requests notification when data buffered by the driver/hardware has
  * been played. If set_callback() has previously been called to enable
  * non-blocking mode, the drain() must not block, instead it should return
  * quickly and completion of the drain is notified through the callback.
  * If set_callback() has not been called, the drain() must block until
  * completion.
  * If type==AUDIO_DRAIN_ALL, the drain completes when all previously written
  * data has been played.
  * If type==AUDIO_DRAIN_EARLY_NOTIFY, the drain completes shortly before all
  * data for the current track has played to allow time for the framework
  * to perform a gapless track switch.
  *
  * Drain must return immediately on stop() and flush() call
  *
  * Implementation of this function is mandatory for offloaded playback.
  */
 int qahw_out_drain_l(qahw_stream_handle_t *out_handle, qahw_drain_type_t type);

 /*
  * Notifies to the audio driver to flush the queued data. Stream must already
  * be paused before calling flush().
  *
  * Implementation of this function is mandatory for offloaded playback.
  */
 int qahw_out_flush_l(qahw_stream_handle_t *out_handle);

 /*
  * Return a recent count of the number of audio frames presented to an external observer.
  * This excludes frames which have been written but are still in the pipeline.
  * The count is not reset to zero when output enters standby.
  * Also returns the value of CLOCK_MONOTONIC as of this presentation count.
  * The returned count is expected to be 'recent',
  * but does not need to be the most recent possible value.
  * However, the associated time should correspond to whatever count is returned.
  * Example:  assume that N+M frames have been presented, where M is a 'small' number.
  * Then it is permissible to return N instead of N+M,
  * and the timestamp should correspond to N rather than N+M.
  * The terms 'recent' and 'small' are not defined.
  * They reflect the quality of the implementation.
  *
  * 3.0 and higher only.
  */
 int qahw_out_get_presentation_position_l(const qahw_stream_handle_t *out_handle,
                                        uint64_t *frames, struct timespec *timestamp);

 /* Input stream specific APIs */

 /* This method creates and opens the audio hardware input stream */
 int qahw_open_input_stream_l(qahw_module_handle_t *hw_module,
                            audio_io_handle_t handle,
                            audio_devices_t devices,
                            struct audio_config *config,
                            qahw_stream_handle_t **stream_in,
                            audio_input_flags_t flags,
                            const char *address,
                            audio_source_t source);

 int qahw_close_input_stream_l(qahw_stream_handle_t *in_handle);

 /*
  * Return the sampling rate in Hz - eg. 44100.
  */
 uint32_t qahw_in_get_sample_rate_l(const qahw_stream_handle_t *in_handle);

 /*
  * currently unused - use set_parameters with key
  *    QAHW_PARAMETER_STREAM_SAMPLING_RATE
  */
 int qahw_in_set_sample_rate_l(qahw_stream_handle_t *in_handle, uint32_t rate);

 /*
  * Return size of input/output buffer in bytes for this stream - eg. 4800.
  * It should be a multiple of the frame size.  See also get_input_buffer_size.
  */
 size_t qahw_in_get_buffer_size_l(const qahw_stream_handle_t *in_handle);

 /*
  * Return the channel mask -
  *  e.g. AUDIO_CHANNEL_OUT_STEREO or AUDIO_CHANNEL_IN_STEREO
  */
 audio_channel_mask_t qahw_in_get_channels_l(const qahw_stream_handle_t *in_handle);

 /*
  * Return the audio format - e.g. AUDIO_FORMAT_PCM_16_BIT
  */
 audio_format_t qahw_in_get_format_l(const qahw_stream_handle_t *in_handle);

 /*
  * currently unused - use set_parameters with key
  *     QAHW_PARAMETER_STREAM_FORMAT
  */
 int qahw_in_set_format_l(qahw_stream_handle_t *in_handle, audio_format_t format);

 /*
  * Put the audio hardware input/output into standby mode.
  * Driver should exit from standby mode at the next I/O operation.
  * Returns 0 on success and <0 on failure.
  */
 int qahw_in_standby_l(qahw_stream_handle_t *in_handle);

 /*
  * set/get audio stream parameters. The function accepts a list of
  * parameter key value pairs in the form: key1=value1;key2=value2;...
  *
  * Some keys are reserved for standard parameters (See AudioParameter class)
  *
  * If the implementation does not accept a parameter change while
  * the output is active but the parameter is acceptable otherwise, it must
  * return -ENOSYS.
  *
  * The audio flinger will put the stream in standby and then change the
  * parameter value.
  */
 int qahw_in_set_parameters_l(qahw_stream_handle_t *in_handle, const char *kv_pairs);

 /*
  * Returns a pointer to a heap allocated string. The caller is responsible
  * for freeing the memory for it using free().
  */
 char* qahw_in_get_parameters_l(const qahw_stream_handle_t *in_handle,
                               const char *keys);
 /*
  * Read audio buffer in from audio driver. Returns number of bytes read, or a
  * negative status_t. meta_data structure is filled buffer pointer, start
  * offset and valid catpure timestamp (if session is opened with timetamp flag)
  * and buffer. if at least one frame was read prior to the error,
  * read should return that byte count and then return an error in the
  * subsequent call.
  */
 ssize_t qahw_in_read_l(qahw_stream_handle_t *in_handle,
                      qahw_in_buffer_t *in_buf);
 /*
  * Return the amount of input frames lost in the audio driver since the
  * last call of this function.
  * Audio driver is expected to reset the value to 0 and restart counting
  * upon returning the current value by this function call.
  * Such loss typically occurs when the user space process is blocked
  * longer than the capacity of audio driver buffers.
  *
  * Unit: the number of input audio frames
  */
 uint32_t qahw_in_get_input_frames_lost_l(qahw_stream_handle_t *in_handle);

 /*
  * Return a recent count of the number of audio frames received and
  * the clock time associated with that frame count.
  *
  * frames is the total frame count received. This should be as early in
  *     the capture pipeline as possible. In general,
  *     frames should be non-negative and should not go "backwards".
  *
  * time is the clock MONOTONIC time when frames was measured. In general,
  *     time should be a positive quantity and should not go "backwards".
  *
  * The status returned is 0 on success, -ENOSYS if the device is not
  * ready/available, or -EINVAL if the arguments are null or otherwise invalid.
  */
 int qahw_in_get_capture_position_l(const qahw_stream_handle_t *in_handle,
                                  int64_t *frames, int64_t *time);

 /* Module specific APIs */

 /* convenience API for opening and closing an audio HAL module */
 qahw_module_handle_t *qahw_load_module_l(const char *hw_module_id);

 int qahw_unload_module_l(qahw_module_handle_t *hw_module);

 /*
  * check to see if the audio hardware interface has been initialized.
  * returns 0 on success, -ENODEV on failure.
  */
 int qahw_init_check_l(const qahw_module_handle_t *hw_module);

 /* set the audio volume of a voice call. Range is between 0.0 and 1.0 */
 int qahw_set_voice_volume_l(qahw_module_handle_t *hw_module, float volume);

 /*
  * set_mode is called when the audio mode changes. AUDIO_MODE_NORMAL mode
  * is for standard audio playback, AUDIO_MODE_RINGTONE when a ringtone is
  * playing, and AUDIO_MODE_IN_CALL when a call is in progress.
  */
 int qahw_set_mode_l(qahw_module_handle_t *hw_module, audio_mode_t mode);

 /* Mute/unmute mic during voice/voip/HFP call */
 int qahw_set_mic_mute_l(qahw_module_handle_t *hw_module, bool state);

 /* Get mute/unmute status of mic during voice call */
 int qahw_get_mic_mute_l(qahw_module_handle_t *hw_module, bool *state);

 /* set/get global audio parameters */
 int qahw_set_parameters_l(qahw_module_handle_t *hw_module, const char *kv_pairs);

 /*
  * Returns a pointer to a heap allocated string. The caller is responsible
  * for freeing the memory for it using free().
  */
 char* qahw_get_parameters_l(const qahw_module_handle_t *hw_module,
                            const char *keys);

 /* Returns audio input buffer size according to parameters passed or
  * 0 if one of the parameters is not supported.
  * See also get_buffer_size which is for a particular stream.
  */
 size_t qahw_get_input_buffer_size_l(const qahw_module_handle_t *hw_module,
                                   const struct audio_config *config);

 /*returns current QTI HAL version */
 int qahw_get_version_l();

 /* Api to implement get parameters based on keyword param_id
  * and store data in payload.
  */
 int qahw_get_param_data_l(const qahw_module_handle_t *hw_module,
                         qahw_param_id param_id,
                         qahw_param_payload *payload);

 /* Api to implement set parameters based on keyword param_id
  * and data present in payload.
  */
 int qahw_set_param_data_l(const qahw_module_handle_t *hw_module,
                         qahw_param_id param_id,
                         qahw_param_payload *payload);

 /* Creates an audio patch between several source and sink ports.
  * The handle is allocated by the HAL and should be unique for this
  * audio HAL module.
  */
 int qahw_create_audio_patch_l(qahw_module_handle_t *hw_module,
                         unsigned int num_sources,
                         const struct audio_port_config *sources,
                         unsigned int num_sinks,
                         const struct audio_port_config *sinks,
                         audio_patch_handle_t *handle);

 /* Release an audio patch */
 int qahw_release_audio_patch_l(qahw_module_handle_t *hw_module,
                         audio_patch_handle_t handle);

 /* API to set loopback stream specific config parameters. */
 int qahw_loopback_set_param_data_l(qahw_module_handle_t *hw_module,
                                    audio_patch_handle_t handle,
                                    qahw_loopback_param_id param_id,
                                    qahw_loopback_param_payload *payload);

 /* Fills the list of supported attributes for a given audio port.
  * As input, "port" contains the information (type, role, address etc...)
  * needed by the HAL to identify the port.
  * As output, "port" contains possible attributes (sampling rates, formats,
  * channel masks, gain controllers...) for this port.
  */
 int qahw_get_audio_port_l(qahw_module_handle_t *hw_module,
                       struct audio_port *port);

 /* Set audio port configuration */
 int qahw_set_audio_port_config_l(qahw_module_handle_t *hw_module,
                      const struct audio_port_config *config);

 /* Audio effects API */
 qahw_effect_lib_handle_t qahw_effect_load_library_l(const char *lib_path);

 int32_t qahw_effect_unload_library_l(qahw_effect_lib_handle_t handle);

 int32_t qahw_effect_create_l(qahw_effect_lib_handle_t handle,
                            const qahw_effect_uuid_t *uuid,
                            int32_t io_handle,
                            qahw_effect_handle_t *effect_handle);

 int32_t qahw_effect_release_l(qahw_effect_lib_handle_t handle,
                             qahw_effect_handle_t effect_handle);

 int32_t qahw_effect_get_descriptor_l(qahw_effect_lib_handle_t handle,
                                    const qahw_effect_uuid_t *uuid,
                                    qahw_effect_descriptor_t *effect_desc);

 int32_t qahw_effect_get_version_l();

 int32_t qahw_effect_process_l(qahw_effect_handle_t self,
                             qahw_audio_buffer_t *in_buffer,
                             qahw_audio_buffer_t *out_buffer);

 int32_t qahw_effect_command_l(qahw_effect_handle_t self,
                             uint32_t cmd_code,
                             uint32_t cmd_size,
                             void *cmd_data,
                             uint32_t *reply_size,
                             void *reply_data);

 int32_t qahw_effect_process_reverse_l(qahw_effect_handle_t self,
                                     qahw_audio_buffer_t *in_buffer,
                                     qahw_audio_buffer_t *out_buffer);

 #ifdef __cplusplus
 }
 #endif

 __END_DECLS

 #endif  // QTI_AUDIO_QAHW_H
	/*
	* Copyright (c) 2016-2018, The Linux Foundation. All rights reserved.
	* Not a Contribution.
	*
	* Copyright (C) 2011 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 QTI_AUDIO_QAHW_H
	#define QTI_AUDIO_QAHW_H

	#include <stdint.h>
	#include <strings.h>
	#include <sys/cdefs.h>
	#include <sys/types.h>
	#include <sys/time.h>
	#include <cutils/bitops.h>
	#include <system/audio.h>
	#include "qahw_defs.h"
	#include "qahw_effect_api.h"

	__BEGIN_DECLS

	/*
	* Helper macros for module implementors.
	*
	* The derived modules should provide convenience macros for supported
	* versions so that implementations can explicitly specify module
	* versions at definition time.
	*/

	#define QAHW_MAKE_API_VERSION(maj,min) \
	((((maj) & 0xff) << 8) \| ((min) & 0xff))

	/* First generation of audio devices had version hardcoded to 0. all devices with
	* versions < 1.0 will be considered of first generation API.
	*/
	#define QAHW_MODULE_API_VERSION_0_0 QAHW_MAKE_API_VERSION(0, 0)

	/* Minimal QTI audio HAL version supported by the audio framework */
	#define QAHW_MODULE_API_VERSION_MIN QAHW_MODULE_API_VERSION_0_0

	/**
	* List of known audio HAL modules. This is the base name of the audio HAL
	* library composed of the "audio." prefix, one of the base names below and
	* a suffix specific to the device.
	* e.g: audio.primary.goldfish.so or audio.a2dp.default.so
	*/

	#define QAHW_MODULE_ID_PRIMARY "audio.primary"
	#define QAHW_MODULE_ID_A2DP "audio.a2dp"
	#define QAHW_MODULE_ID_USB "audio.usb"

	typedef void qahw_module_handle_t;
	typedef void qahw_stream_handle_t;

	#ifdef __cplusplus
	extern "C"
	{
	#endif
	/**************************************/
	/* Output stream specific APIs **/

	/*
	* This method creates and opens the audio hardware output stream.
	* The "address" parameter qualifies the "devices" audio device type if needed.
	* The format format depends on the device type:
	* - Bluetooth devices use the MAC address of the device in the form "00:11:22:AA:BB:CC"
	* - USB devices use the ALSA card and device numbers in the form "card=X;device=Y"
	* - Other devices may use a number or any other string.
	*/

	int qahw_open_output_stream_l(qahw_module_handle_t *hw_module,
	audio_io_handle_t handle,
	audio_devices_t devices,
	audio_output_flags_t flags,
	struct audio_config *config,
	qahw_stream_handle_t **out_handle,
	const char *address);

	int qahw_close_output_stream_l(qahw_stream_handle_t *out_handle);

	/*
	* Return the sampling rate in Hz - eg. 44100.
	*/
	uint32_t qahw_out_get_sample_rate_l(const qahw_stream_handle_t *stream);

	/*
	* use set_parameters with key QAHW_PARAMETER_STREAM_SAMPLING_RATE
	*/
	int qahw_out_set_sample_rate_l(qahw_stream_handle_t *stream, uint32_t rate);

	/*
	* Return size of input/output buffer in bytes for this stream - eg. 4800.
	* It should be a multiple of the frame size. See also get_input_buffer_size.
	*/
	size_t qahw_out_get_buffer_size_l(const qahw_stream_handle_t *stream);

	/*
	* Return the channel mask -
	* e.g. AUDIO_CHANNEL_OUT_STEREO or AUDIO_CHANNEL_IN_STEREO
	*/
	audio_channel_mask_t qahw_out_get_channels_l(const qahw_stream_handle_t *stream);

	/*
	* Return the audio format - e.g. AUDIO_FORMAT_PCM_16_BIT
	*/
	audio_format_t qahw_out_get_format_l(const qahw_stream_handle_t *stream);

	/*
	* Put the audio hardware input/output into standby mode.
	* Driver should exit from standby mode at the next I/O operation.
	* Returns 0 on success and <0 on failure.
	*/
	int qahw_out_standby_l(qahw_stream_handle_t *stream);

	/*
	* set/get audio stream parameters. The function accepts a list of
	* parameter key value pairs in the form: key1=value1;key2=value2;...
	*
	* Some keys are reserved for standard parameters (See AudioParameter class)
	*
	* If the implementation does not accept a parameter change while
	* the output is active but the parameter is acceptable otherwise, it must
	* return -ENOSYS.
	*
	* The audio flinger will put the stream in standby and then change the
	* parameter value.
	*/
	int qahw_out_set_parameters_l(qahw_stream_handle_t stream, const charkv_pairs);

	/*
	* Returns a pointer to a heap allocated string. The caller is responsible
	* for freeing the memory for it using free().
	*/
	char* qahw_out_get_parameters_l(const qahw_stream_handle_t *stream,
	const char *keys);

	/* API to set playback stream specific config parameters */
	int qahw_out_set_param_data_l(qahw_stream_handle_t *out_handle,
	qahw_param_id param_id,
	qahw_param_payload *payload);

	/* API to get playback stream specific config parameters */
	int qahw_out_get_param_data_l(qahw_stream_handle_t *out_handle,
	qahw_param_id param_id,
	qahw_param_payload *payload);

	/*
	* Return the audio hardware driver estimated latency in milliseconds.
	*/
	uint32_t qahw_out_get_latency_l(const qahw_stream_handle_t *stream);

	/*
	* Use this method in situations where audio mixing is done in the
	* hardware. This method serves as a direct interface with hardware,
	* allowing you to directly set the volume as apposed to via the framework.
	* This method might produce multiple PCM outputs or hardware accelerated
	* codecs, such as MP3 or AAC.
	*/
	int qahw_out_set_volume_l(qahw_stream_handle_t *stream, float left, float right);

	/*
	* Write audio buffer present in meta_data starting from offset
	* along with timestamp to driver. Returns number of bytes
	* written or a negative status_t. If at least one frame was written successfully
	* prior to the error, it is suggested that the driver return that successful
	* (short) byte count and then return an error in the subsequent call.
	* timestamp is only sent driver is session has been opened with timestamp flag
	* otherwise its ignored.
	*
	* If set_callback() has previously been called to enable non-blocking mode
	* the write() is not allowed to block. It must write only the number of
	* bytes that currently fit in the driver/hardware buffer and then return
	* this byte count. If this is less than the requested write size the
	* callback function must be called when more space is available in the
	* driver/hardware buffer.
	*/
	ssize_t qahw_out_write_l(qahw_stream_handle_t *stream,
	qahw_out_buffer_t *out_buf);

	/*
	* return the number of audio frames written by the audio dsp to DAC since
	* the output has exited standby
	*/
	int qahw_out_get_render_position_l(const qahw_stream_handle_t *stream,
	uint32_t *dsp_frames);

	/*
	* set the callback function for notifying completion of non-blocking
	* write and drain.
	* Calling this function implies that all future rite() and drain()
	* must be non-blocking and use the callback to signal completion.
	*/
	int qahw_out_set_callback_l(qahw_stream_handle_t *stream,
	qahw_stream_callback_t callback,
	void *cookie);

	/*
	* Notifies to the audio driver to stop playback however the queued buffers are
	* retained by the hardware. Useful for implementing pause/resume. Empty implementation
	* if not supported however should be implemented for hardware with non-trivial
	* latency. In the pause state audio hardware could still be using power. User may
	* consider calling suspend after a timeout.
	*
	* Implementation of this function is mandatory for offloaded playback.
	*/
	int qahw_out_pause_l(qahw_stream_handle_t *out_handle);

	/*
	* Notifies to the audio driver to resume playback following a pause.
	* Returns error if called without matching pause.
	*
	* Implementation of this function is mandatory for offloaded playback.
	*/
	int qahw_out_resume_l(qahw_stream_handle_t *out_handle);

	/*
	* Requests notification when data buffered by the driver/hardware has
	* been played. If set_callback() has previously been called to enable
	* non-blocking mode, the drain() must not block, instead it should return
	* quickly and completion of the drain is notified through the callback.
	* If set_callback() has not been called, the drain() must block until
	* completion.
	* If type==AUDIO_DRAIN_ALL, the drain completes when all previously written
	* data has been played.
	* If type==AUDIO_DRAIN_EARLY_NOTIFY, the drain completes shortly before all
	* data for the current track has played to allow time for the framework
	* to perform a gapless track switch.
	*
	* Drain must return immediately on stop() and flush() call
	*
	* Implementation of this function is mandatory for offloaded playback.
	*/
	int qahw_out_drain_l(qahw_stream_handle_t *out_handle, qahw_drain_type_t type);

	/*
	* Notifies to the audio driver to flush the queued data. Stream must already
	* be paused before calling flush().
	*
	* Implementation of this function is mandatory for offloaded playback.
	*/
	int qahw_out_flush_l(qahw_stream_handle_t *out_handle);

	/*
	* Return a recent count of the number of audio frames presented to an external observer.
	* This excludes frames which have been written but are still in the pipeline.
	* The count is not reset to zero when output enters standby.
	* Also returns the value of CLOCK_MONOTONIC as of this presentation count.
	* The returned count is expected to be 'recent',
	* but does not need to be the most recent possible value.
	* However, the associated time should correspond to whatever count is returned.
	* Example: assume that N+M frames have been presented, where M is a 'small' number.
	* Then it is permissible to return N instead of N+M,
	* and the timestamp should correspond to N rather than N+M.
	* The terms 'recent' and 'small' are not defined.
	* They reflect the quality of the implementation.
	*
	* 3.0 and higher only.
	*/
	int qahw_out_get_presentation_position_l(const qahw_stream_handle_t *out_handle,
	uint64_t frames, struct timespec timestamp);

	/* Input stream specific APIs */

	/* This method creates and opens the audio hardware input stream */
	int qahw_open_input_stream_l(qahw_module_handle_t *hw_module,
	audio_io_handle_t handle,
	audio_devices_t devices,
	struct audio_config *config,
	qahw_stream_handle_t **stream_in,
	audio_input_flags_t flags,
	const char *address,
	audio_source_t source);

	int qahw_close_input_stream_l(qahw_stream_handle_t *in_handle);

	/*
	* Return the sampling rate in Hz - eg. 44100.
	*/
	uint32_t qahw_in_get_sample_rate_l(const qahw_stream_handle_t *in_handle);

	/*
	* currently unused - use set_parameters with key
	* QAHW_PARAMETER_STREAM_SAMPLING_RATE
	*/
	int qahw_in_set_sample_rate_l(qahw_stream_handle_t *in_handle, uint32_t rate);

	/*
	* Return size of input/output buffer in bytes for this stream - eg. 4800.
	* It should be a multiple of the frame size. See also get_input_buffer_size.
	*/
	size_t qahw_in_get_buffer_size_l(const qahw_stream_handle_t *in_handle);

	/*
	* Return the channel mask -
	* e.g. AUDIO_CHANNEL_OUT_STEREO or AUDIO_CHANNEL_IN_STEREO
	*/
	audio_channel_mask_t qahw_in_get_channels_l(const qahw_stream_handle_t *in_handle);

	/*
	* Return the audio format - e.g. AUDIO_FORMAT_PCM_16_BIT
	*/
	audio_format_t qahw_in_get_format_l(const qahw_stream_handle_t *in_handle);

	/*
	* currently unused - use set_parameters with key
	* QAHW_PARAMETER_STREAM_FORMAT
	*/
	int qahw_in_set_format_l(qahw_stream_handle_t *in_handle, audio_format_t format);

	/*
	* Put the audio hardware input/output into standby mode.
	* Driver should exit from standby mode at the next I/O operation.
	* Returns 0 on success and <0 on failure.
	*/
	int qahw_in_standby_l(qahw_stream_handle_t *in_handle);

	/*
	* set/get audio stream parameters. The function accepts a list of
	* parameter key value pairs in the form: key1=value1;key2=value2;...
	*
	* Some keys are reserved for standard parameters (See AudioParameter class)
	*
	* If the implementation does not accept a parameter change while
	* the output is active but the parameter is acceptable otherwise, it must
	* return -ENOSYS.
	*
	* The audio flinger will put the stream in standby and then change the
	* parameter value.
	*/
	int qahw_in_set_parameters_l(qahw_stream_handle_t in_handle, const char kv_pairs);

	/*
	* Returns a pointer to a heap allocated string. The caller is responsible
	* for freeing the memory for it using free().
	*/
	char* qahw_in_get_parameters_l(const qahw_stream_handle_t *in_handle,
	const char *keys);
	/*
	* Read audio buffer in from audio driver. Returns number of bytes read, or a
	* negative status_t. meta_data structure is filled buffer pointer, start
	* offset and valid catpure timestamp (if session is opened with timetamp flag)
	* and buffer. if at least one frame was read prior to the error,
	* read should return that byte count and then return an error in the
	* subsequent call.
	*/
	ssize_t qahw_in_read_l(qahw_stream_handle_t *in_handle,
	qahw_in_buffer_t *in_buf);
	/*
	* Return the amount of input frames lost in the audio driver since the
	* last call of this function.
	* Audio driver is expected to reset the value to 0 and restart counting
	* upon returning the current value by this function call.
	* Such loss typically occurs when the user space process is blocked
	* longer than the capacity of audio driver buffers.
	*
	* Unit: the number of input audio frames
	*/
	uint32_t qahw_in_get_input_frames_lost_l(qahw_stream_handle_t *in_handle);

	/*
	* Return a recent count of the number of audio frames received and
	* the clock time associated with that frame count.
	*
	* frames is the total frame count received. This should be as early in
	* the capture pipeline as possible. In general,
	* frames should be non-negative and should not go "backwards".
	*
	* time is the clock MONOTONIC time when frames was measured. In general,
	* time should be a positive quantity and should not go "backwards".
	*
	* The status returned is 0 on success, -ENOSYS if the device is not
	* ready/available, or -EINVAL if the arguments are null or otherwise invalid.
	*/
	int qahw_in_get_capture_position_l(const qahw_stream_handle_t *in_handle,
	int64_t frames, int64_t time);

	/* Module specific APIs */

	/* convenience API for opening and closing an audio HAL module */
	qahw_module_handle_t qahw_load_module_l(const char hw_module_id);

	int qahw_unload_module_l(qahw_module_handle_t *hw_module);

	/*
	* check to see if the audio hardware interface has been initialized.
	* returns 0 on success, -ENODEV on failure.
	*/
	int qahw_init_check_l(const qahw_module_handle_t *hw_module);

	/* set the audio volume of a voice call. Range is between 0.0 and 1.0 */
	int qahw_set_voice_volume_l(qahw_module_handle_t *hw_module, float volume);

	/*
	* set_mode is called when the audio mode changes. AUDIO_MODE_NORMAL mode
	* is for standard audio playback, AUDIO_MODE_RINGTONE when a ringtone is
	* playing, and AUDIO_MODE_IN_CALL when a call is in progress.
	*/
	int qahw_set_mode_l(qahw_module_handle_t *hw_module, audio_mode_t mode);

	/* Mute/unmute mic during voice/voip/HFP call */
	int qahw_set_mic_mute_l(qahw_module_handle_t *hw_module, bool state);

	/* Get mute/unmute status of mic during voice call */
	int qahw_get_mic_mute_l(qahw_module_handle_t hw_module, bool state);

	/* set/get global audio parameters */
	int qahw_set_parameters_l(qahw_module_handle_t hw_module, const char kv_pairs);

	/*
	* Returns a pointer to a heap allocated string. The caller is responsible
	* for freeing the memory for it using free().
	*/
	char* qahw_get_parameters_l(const qahw_module_handle_t *hw_module,
	const char *keys);

	/* Returns audio input buffer size according to parameters passed or
	* 0 if one of the parameters is not supported.
	* See also get_buffer_size which is for a particular stream.
	*/
	size_t qahw_get_input_buffer_size_l(const qahw_module_handle_t *hw_module,
	const struct audio_config *config);

	/returns current QTI HAL version /
	int qahw_get_version_l();

	/* Api to implement get parameters based on keyword param_id
	* and store data in payload.
	*/
	int qahw_get_param_data_l(const qahw_module_handle_t *hw_module,
	qahw_param_id param_id,
	qahw_param_payload *payload);

	/* Api to implement set parameters based on keyword param_id
	* and data present in payload.
	*/
	int qahw_set_param_data_l(const qahw_module_handle_t *hw_module,
	qahw_param_id param_id,
	qahw_param_payload *payload);

	/* Creates an audio patch between several source and sink ports.
	* The handle is allocated by the HAL and should be unique for this
	* audio HAL module.
	*/
	int qahw_create_audio_patch_l(qahw_module_handle_t *hw_module,
	unsigned int num_sources,
	const struct audio_port_config *sources,
	unsigned int num_sinks,
	const struct audio_port_config *sinks,
	audio_patch_handle_t *handle);

	/* Release an audio patch */
	int qahw_release_audio_patch_l(qahw_module_handle_t *hw_module,
	audio_patch_handle_t handle);

	/* API to set loopback stream specific config parameters. */
	int qahw_loopback_set_param_data_l(qahw_module_handle_t *hw_module,
	audio_patch_handle_t handle,
	qahw_loopback_param_id param_id,
	qahw_loopback_param_payload *payload);

	/* Fills the list of supported attributes for a given audio port.
	* As input, "port" contains the information (type, role, address etc...)
	* needed by the HAL to identify the port.
	* As output, "port" contains possible attributes (sampling rates, formats,
	* channel masks, gain controllers...) for this port.
	*/
	int qahw_get_audio_port_l(qahw_module_handle_t *hw_module,
	struct audio_port *port);

	/* Set audio port configuration */
	int qahw_set_audio_port_config_l(qahw_module_handle_t *hw_module,
	const struct audio_port_config *config);

	/* Audio effects API */
	qahw_effect_lib_handle_t qahw_effect_load_library_l(const char *lib_path);

	int32_t qahw_effect_unload_library_l(qahw_effect_lib_handle_t handle);

	int32_t qahw_effect_create_l(qahw_effect_lib_handle_t handle,
	const qahw_effect_uuid_t *uuid,
	int32_t io_handle,
	qahw_effect_handle_t *effect_handle);

	int32_t qahw_effect_release_l(qahw_effect_lib_handle_t handle,
	qahw_effect_handle_t effect_handle);

	int32_t qahw_effect_get_descriptor_l(qahw_effect_lib_handle_t handle,
	const qahw_effect_uuid_t *uuid,
	qahw_effect_descriptor_t *effect_desc);

	int32_t qahw_effect_get_version_l();

	int32_t qahw_effect_process_l(qahw_effect_handle_t self,
	qahw_audio_buffer_t *in_buffer,
	qahw_audio_buffer_t *out_buffer);

	int32_t qahw_effect_command_l(qahw_effect_handle_t self,
	uint32_t cmd_code,
	uint32_t cmd_size,
	void *cmd_data,
	uint32_t *reply_size,
	void *reply_data);

	int32_t qahw_effect_process_reverse_l(qahw_effect_handle_t self,
	qahw_audio_buffer_t *in_buffer,
	qahw_audio_buffer_t *out_buffer);

	#ifdef __cplusplus
	}
	#endif

	__END_DECLS

	#endif // QTI_AUDIO_QAHW_H