2 * Copyright (C) 2011 The Android Open Source Project
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
18 #ifndef ANDROID_AUDIO_CORE_H
19 #define ANDROID_AUDIO_CORE_H
24 #include <sys/cdefs.h>
25 #include <sys/types.h>
27 #include <cutils/bitops.h>
29 #include "audio-base.h"
33 /* The enums were moved here mostly from
34 * frameworks/base/include/media/AudioSystem.h
37 /* represents an invalid uid for tracks; the calling or client uid is often substituted. */
38 #define AUDIO_UID_INVALID ((uid_t)-1)
40 /* device address used to refer to the standard remote submix */
41 #define AUDIO_REMOTE_SUBMIX_DEVICE_ADDRESS "0"
43 /* AudioFlinger and AudioPolicy services use I/O handles to identify audio sources and sinks */
44 typedef int audio_io_handle_t;
46 /* Do not change these values without updating their counterparts
47 * in frameworks/base/media/java/android/media/AudioAttributes.java
50 AUDIO_CONTENT_TYPE_UNKNOWN = 0,
51 AUDIO_CONTENT_TYPE_SPEECH = 1,
52 AUDIO_CONTENT_TYPE_MUSIC = 2,
53 AUDIO_CONTENT_TYPE_MOVIE = 3,
54 AUDIO_CONTENT_TYPE_SONIFICATION = 4,
56 AUDIO_CONTENT_TYPE_CNT,
57 AUDIO_CONTENT_TYPE_MAX = AUDIO_CONTENT_TYPE_CNT - 1,
58 } audio_content_type_t;
60 typedef uint32_t audio_flags_mask_t;
62 /* Do not change these values without updating their counterparts
63 * in frameworks/base/media/java/android/media/AudioAttributes.java
66 AUDIO_FLAG_AUDIBILITY_ENFORCED = 0x1,
67 AUDIO_FLAG_SECURE = 0x2,
69 AUDIO_FLAG_BEACON = 0x8,
70 AUDIO_FLAG_HW_AV_SYNC = 0x10,
71 AUDIO_FLAG_HW_HOTWORD = 0x20,
72 AUDIO_FLAG_BYPASS_INTERRUPTION_POLICY = 0x40,
73 AUDIO_FLAG_BYPASS_MUTE = 0x80,
74 AUDIO_FLAG_LOW_LATENCY = 0x100,
77 /* Audio attributes */
78 #define AUDIO_ATTRIBUTES_TAGS_MAX_SIZE 256
80 audio_content_type_t content_type;
82 audio_source_t source;
83 audio_flags_mask_t flags;
84 char tags[AUDIO_ATTRIBUTES_TAGS_MAX_SIZE]; /* UTF8 */
87 /* a unique ID allocated by AudioFlinger for use as an audio_io_handle_t, audio_session_t,
88 * effect ID (int), audio_module_handle_t, and audio_patch_handle_t.
89 * Audio port IDs (audio_port_handle_t) are allocated by AudioPolicy
90 * in a different namespace than AudioFlinger unique IDs.
92 typedef int audio_unique_id_t;
94 /* Possible uses for an audio_unique_id_t */
96 AUDIO_UNIQUE_ID_USE_UNSPECIFIED = 0,
97 AUDIO_UNIQUE_ID_USE_SESSION = 1, // for allocated sessions, not special AUDIO_SESSION_*
98 AUDIO_UNIQUE_ID_USE_MODULE = 2,
99 AUDIO_UNIQUE_ID_USE_EFFECT = 3,
100 AUDIO_UNIQUE_ID_USE_PATCH = 4,
101 AUDIO_UNIQUE_ID_USE_OUTPUT = 5,
102 AUDIO_UNIQUE_ID_USE_INPUT = 6,
104 AUDIO_UNIQUE_ID_USE_MAX = 8, // must be a power-of-two
105 AUDIO_UNIQUE_ID_USE_MASK = AUDIO_UNIQUE_ID_USE_MAX - 1
106 } audio_unique_id_use_t;
108 /* Return the use of an audio_unique_id_t */
109 static inline audio_unique_id_use_t audio_unique_id_get_use(audio_unique_id_t id)
111 return (audio_unique_id_use_t) (id & AUDIO_UNIQUE_ID_USE_MASK);
114 /* Reserved audio_unique_id_t values. FIXME: not a complete list. */
115 #define AUDIO_UNIQUE_ID_ALLOCATE AUDIO_SESSION_ALLOCATE
117 /* A channel mask per se only defines the presence or absence of a channel, not the order.
118 * But see AUDIO_INTERLEAVE_* below for the platform convention of order.
120 * audio_channel_mask_t is an opaque type and its internal layout should not
121 * be assumed as it may change in the future.
122 * Instead, always use the functions declared in this header to examine.
124 * These are the current representations:
126 * AUDIO_CHANNEL_REPRESENTATION_POSITION
127 * is a channel mask representation for position assignment.
128 * Each low-order bit corresponds to the spatial position of a transducer (output),
129 * or interpretation of channel (input).
130 * The user of a channel mask needs to know the context of whether it is for output or input.
131 * The constants AUDIO_CHANNEL_OUT_* or AUDIO_CHANNEL_IN_* apply to the bits portion.
132 * It is not permitted for no bits to be set.
134 * AUDIO_CHANNEL_REPRESENTATION_INDEX
135 * is a channel mask representation for index assignment.
136 * Each low-order bit corresponds to a selected channel.
137 * There is no platform interpretation of the various bits.
138 * There is no concept of output or input.
139 * It is not permitted for no bits to be set.
141 * All other representations are reserved for future use.
143 * Warning: current representation distinguishes between input and output, but this will not the be
144 * case in future revisions of the platform. Wherever there is an ambiguity between input and output
145 * that is currently resolved by checking the channel mask, the implementer should look for ways to
146 * fix it with additional information outside of the mask.
148 typedef uint32_t audio_channel_mask_t;
150 /* log(2) of maximum number of representations, not part of public API */
151 #define AUDIO_CHANNEL_REPRESENTATION_LOG2 2
153 /* The return value is undefined if the channel mask is invalid. */
154 static inline uint32_t audio_channel_mask_get_bits(audio_channel_mask_t channel)
156 return channel & ((1 << AUDIO_CHANNEL_COUNT_MAX) - 1);
159 typedef uint32_t audio_channel_representation_t;
161 /* The return value is undefined if the channel mask is invalid. */
162 static inline audio_channel_representation_t audio_channel_mask_get_representation(
163 audio_channel_mask_t channel)
165 // The right shift should be sufficient, but also "and" for safety in case mask is not 32 bits
166 return (audio_channel_representation_t)
167 ((channel >> AUDIO_CHANNEL_COUNT_MAX) & ((1 << AUDIO_CHANNEL_REPRESENTATION_LOG2) - 1));
170 /* Returns true if the channel mask is valid,
171 * or returns false for AUDIO_CHANNEL_NONE, AUDIO_CHANNEL_INVALID, and other invalid values.
172 * This function is unable to determine whether a channel mask for position assignment
173 * is invalid because an output mask has an invalid output bit set,
174 * or because an input mask has an invalid input bit set.
175 * All other APIs that take a channel mask assume that it is valid.
177 static inline bool audio_channel_mask_is_valid(audio_channel_mask_t channel)
179 uint32_t bits = audio_channel_mask_get_bits(channel);
180 audio_channel_representation_t representation = audio_channel_mask_get_representation(channel);
181 switch (representation) {
182 case AUDIO_CHANNEL_REPRESENTATION_POSITION:
183 case AUDIO_CHANNEL_REPRESENTATION_INDEX:
192 /* Not part of public API */
193 static inline audio_channel_mask_t audio_channel_mask_from_representation_and_bits(
194 audio_channel_representation_t representation, uint32_t bits)
196 return (audio_channel_mask_t) ((representation << AUDIO_CHANNEL_COUNT_MAX) | bits);
199 /* This enum is deprecated */
201 AUDIO_IN_ACOUSTICS_NONE = 0,
202 AUDIO_IN_ACOUSTICS_AGC_ENABLE = 0x0001,
203 AUDIO_IN_ACOUSTICS_AGC_DISABLE = 0,
204 AUDIO_IN_ACOUSTICS_NS_ENABLE = 0x0002,
205 AUDIO_IN_ACOUSTICS_NS_DISABLE = 0,
206 AUDIO_IN_ACOUSTICS_TX_IIR_ENABLE = 0x0004,
207 AUDIO_IN_ACOUSTICS_TX_DISABLE = 0,
208 } audio_in_acoustics_t;
210 typedef uint32_t audio_devices_t;
212 * Stub audio output device. Used in policy configuration file on platforms without audio outputs.
213 * This alias value to AUDIO_DEVICE_OUT_DEFAULT is only used in the audio policy context.
215 #define AUDIO_DEVICE_OUT_STUB AUDIO_DEVICE_OUT_DEFAULT
217 * Stub audio input device. Used in policy configuration file on platforms without audio inputs.
218 * This alias value to AUDIO_DEVICE_IN_DEFAULT is only used in the audio policy context.
220 #define AUDIO_DEVICE_IN_STUB AUDIO_DEVICE_IN_DEFAULT
222 /* Additional information about compressed streams offloaded to
224 * The version and size fields must be initialized by the caller by using
225 * one of the constants defined here.
228 uint16_t version; // version of the info structure
229 uint16_t size; // total size of the structure including version and size
230 uint32_t sample_rate; // sample rate in Hz
231 audio_channel_mask_t channel_mask; // channel mask
232 audio_format_t format; // audio format
233 audio_stream_type_t stream_type; // stream type
234 uint32_t bit_rate; // bit rate in bits per second
235 int64_t duration_us; // duration in microseconds, -1 if unknown
236 bool has_video; // true if stream is tied to a video stream
237 bool is_streaming; // true if streaming, false if local playback
239 uint32_t offload_buffer_size; // offload fragment size
241 } audio_offload_info_t;
243 #define AUDIO_MAKE_OFFLOAD_INFO_VERSION(maj,min) \
244 ((((maj) & 0xff) << 8) | ((min) & 0xff))
246 #define AUDIO_OFFLOAD_INFO_VERSION_0_1 AUDIO_MAKE_OFFLOAD_INFO_VERSION(0, 1)
247 #define AUDIO_OFFLOAD_INFO_VERSION_CURRENT AUDIO_OFFLOAD_INFO_VERSION_0_1
249 static const audio_offload_info_t AUDIO_INFO_INITIALIZER = {
250 /* .version = */ AUDIO_OFFLOAD_INFO_VERSION_CURRENT,
251 /* .size = */ sizeof(audio_offload_info_t),
252 /* .sample_rate = */ 0,
253 /* .channel_mask = */ 0,
254 /* .format = */ AUDIO_FORMAT_DEFAULT,
255 /* .stream_type = */ AUDIO_STREAM_VOICE_CALL,
257 /* .duration_us = */ 0,
258 /* .has_video = */ false,
259 /* .is_streaming = */ false,
260 /* .bit_width = */ 16,
261 /* .offload_buffer_size = */ 0,
262 /* .usage = */ AUDIO_USAGE_UNKNOWN
265 /* common audio stream configuration parameters
266 * You should memset() the entire structure to zero before use to
267 * ensure forward compatibility
269 struct audio_config {
270 uint32_t sample_rate;
271 audio_channel_mask_t channel_mask;
272 audio_format_t format;
273 audio_offload_info_t offload_info;
276 typedef struct audio_config audio_config_t;
278 static const audio_config_t AUDIO_CONFIG_INITIALIZER = {
279 /* .sample_rate = */ 0,
280 /* .channel_mask = */ AUDIO_CHANNEL_NONE,
281 /* .format = */ AUDIO_FORMAT_DEFAULT,
282 /* .offload_info = */ {
283 /* .version = */ AUDIO_OFFLOAD_INFO_VERSION_CURRENT,
284 /* .size = */ sizeof(audio_offload_info_t),
285 /* .sample_rate = */ 0,
286 /* .channel_mask = */ 0,
287 /* .format = */ AUDIO_FORMAT_DEFAULT,
288 /* .stream_type = */ AUDIO_STREAM_VOICE_CALL,
290 /* .duration_us = */ 0,
291 /* .has_video = */ false,
292 /* .is_streaming = */ false,
293 /* .bit_width = */ 16,
294 /* .offload_buffer_size = */ 0,
295 /* .usage = */ AUDIO_USAGE_UNKNOWN
297 /* .frame_count = */ 0,
300 struct audio_config_base {
301 uint32_t sample_rate;
302 audio_channel_mask_t channel_mask;
303 audio_format_t format;
306 typedef struct audio_config_base audio_config_base_t;
308 static const audio_config_base_t AUDIO_CONFIG_BASE_INITIALIZER = {
309 /* .sample_rate = */ 0,
310 /* .channel_mask = */ AUDIO_CHANNEL_NONE,
311 /* .format = */ AUDIO_FORMAT_DEFAULT
314 /* audio hw module handle functions or structures referencing a module */
315 typedef int audio_module_handle_t;
317 /******************************
319 *****************************/
321 /* If the audio hardware supports gain control on some audio paths,
322 * the platform can expose them in the audio_policy.conf file. The audio HAL
323 * will then implement gain control functions that will use the following data
326 typedef uint32_t audio_gain_mode_t;
329 /* An audio_gain struct is a representation of a gain stage.
330 * A gain stage is always attached to an audio port. */
332 audio_gain_mode_t mode; /* e.g. AUDIO_GAIN_MODE_JOINT */
333 audio_channel_mask_t channel_mask; /* channels which gain an be controlled.
334 N/A if AUDIO_GAIN_MODE_CHANNELS is not supported */
335 int min_value; /* minimum gain value in millibels */
336 int max_value; /* maximum gain value in millibels */
337 int default_value; /* default gain value in millibels */
338 unsigned int step_value; /* gain step in millibels */
339 unsigned int min_ramp_ms; /* minimum ramp duration in ms */
340 unsigned int max_ramp_ms; /* maximum ramp duration in ms */
343 /* The gain configuration structure is used to get or set the gain values of a
345 struct audio_gain_config {
346 int index; /* index of the corresponding audio_gain in the
347 audio_port gains[] table */
348 audio_gain_mode_t mode; /* mode requested for this command */
349 audio_channel_mask_t channel_mask; /* channels which gain value follows.
352 // note this "8" is not FCC_8, so it won't need to be changed for > 8 channels
353 int values[sizeof(audio_channel_mask_t) * 8]; /* gain values in millibels
354 for each channel ordered from LSb to MSb in
355 channel mask. The number of values is 1 in joint
356 mode or popcount(channel_mask) */
357 unsigned int ramp_duration_ms; /* ramp duration in ms */
360 /******************************
362 *****************************/
364 /* Types defined here are used to describe an audio source or sink at internal
365 * framework interfaces (audio policy, patch panel) or at the audio HAL.
366 * Sink and sources are grouped in a concept of “audio port” representing an
367 * audio end point at the edge of the system managed by the module exposing
370 /* Each port has a unique ID or handle allocated by policy manager */
371 typedef int audio_port_handle_t;
373 /* the maximum length for the human-readable device name */
374 #define AUDIO_PORT_MAX_NAME_LEN 128
376 /* maximum audio device address length */
377 #define AUDIO_DEVICE_MAX_ADDRESS_LEN 32
379 /* extension for audio port configuration structure when the audio port is a
381 struct audio_port_config_device_ext {
382 audio_module_handle_t hw_module; /* module the device is attached to */
383 audio_devices_t type; /* device type (e.g AUDIO_DEVICE_OUT_SPEAKER) */
384 char address[AUDIO_DEVICE_MAX_ADDRESS_LEN]; /* device address. "" if N/A */
387 /* extension for audio port configuration structure when the audio port is a
389 struct audio_port_config_mix_ext {
390 audio_module_handle_t hw_module; /* module the stream is attached to */
391 audio_io_handle_t handle; /* I/O handle of the input/output stream */
393 //TODO: change use case for output streams: use strategy and mixer attributes
394 audio_stream_type_t stream;
395 audio_source_t source;
399 /* extension for audio port configuration structure when the audio port is an
401 struct audio_port_config_session_ext {
402 audio_session_t session; /* audio session */
405 /* audio port configuration structure used to specify a particular configuration of
407 struct audio_port_config {
408 audio_port_handle_t id; /* port unique ID */
409 audio_port_role_t role; /* sink or source */
410 audio_port_type_t type; /* device, mix ... */
411 unsigned int config_mask; /* e.g AUDIO_PORT_CONFIG_ALL */
412 unsigned int sample_rate; /* sampling rate in Hz */
413 audio_channel_mask_t channel_mask; /* channel mask if applicable */
414 audio_format_t format; /* format if applicable */
415 struct audio_gain_config gain; /* gain to apply if applicable */
417 struct audio_port_config_device_ext device; /* device specific info */
418 struct audio_port_config_mix_ext mix; /* mix specific info */
419 struct audio_port_config_session_ext session; /* session specific info */
424 /* max number of sampling rates in audio port */
425 #define AUDIO_PORT_MAX_SAMPLING_RATES 16
426 /* max number of channel masks in audio port */
427 #define AUDIO_PORT_MAX_CHANNEL_MASKS 16
428 /* max number of audio formats in audio port */
429 #define AUDIO_PORT_MAX_FORMATS 16
430 /* max number of gain controls in audio port */
431 #define AUDIO_PORT_MAX_GAINS 16
433 /* extension for audio port structure when the audio port is a hardware device */
434 struct audio_port_device_ext {
435 audio_module_handle_t hw_module; /* module the device is attached to */
436 audio_devices_t type; /* device type (e.g AUDIO_DEVICE_OUT_SPEAKER) */
437 char address[AUDIO_DEVICE_MAX_ADDRESS_LEN];
440 /* extension for audio port structure when the audio port is a sub mix */
441 struct audio_port_mix_ext {
442 audio_module_handle_t hw_module; /* module the stream is attached to */
443 audio_io_handle_t handle; /* I/O handle of the input.output stream */
444 audio_mix_latency_class_t latency_class; /* latency class */
445 // other attributes: routing strategies
448 /* extension for audio port structure when the audio port is an audio session */
449 struct audio_port_session_ext {
450 audio_session_t session; /* audio session */
454 audio_port_handle_t id; /* port unique ID */
455 audio_port_role_t role; /* sink or source */
456 audio_port_type_t type; /* device, mix ... */
457 char name[AUDIO_PORT_MAX_NAME_LEN];
458 unsigned int num_sample_rates; /* number of sampling rates in following array */
459 unsigned int sample_rates[AUDIO_PORT_MAX_SAMPLING_RATES];
460 unsigned int num_channel_masks; /* number of channel masks in following array */
461 audio_channel_mask_t channel_masks[AUDIO_PORT_MAX_CHANNEL_MASKS];
462 unsigned int num_formats; /* number of formats in following array */
463 audio_format_t formats[AUDIO_PORT_MAX_FORMATS];
464 unsigned int num_gains; /* number of gains in following array */
465 struct audio_gain gains[AUDIO_PORT_MAX_GAINS];
466 struct audio_port_config active_config; /* current audio port configuration */
468 struct audio_port_device_ext device;
469 struct audio_port_mix_ext mix;
470 struct audio_port_session_ext session;
474 /* An audio patch represents a connection between one or more source ports and
475 * one or more sink ports. Patches are connected and disconnected by audio policy manager or by
476 * applications via framework APIs.
477 * Each patch is identified by a handle at the interface used to create that patch. For instance,
478 * when a patch is created by the audio HAL, the HAL allocates and returns a handle.
479 * This handle is unique to a given audio HAL hardware module.
480 * But the same patch receives another system wide unique handle allocated by the framework.
481 * This unique handle is used for all transactions inside the framework.
483 typedef int audio_patch_handle_t;
485 #define AUDIO_PATCH_PORTS_MAX 16
488 audio_patch_handle_t id; /* patch unique ID */
489 unsigned int num_sources; /* number of sources in following array */
490 struct audio_port_config sources[AUDIO_PATCH_PORTS_MAX];
491 unsigned int num_sinks; /* number of sinks in following array */
492 struct audio_port_config sinks[AUDIO_PATCH_PORTS_MAX];
497 /* a HW synchronization source returned by the audio HAL */
498 typedef uint32_t audio_hw_sync_t;
500 /* an invalid HW synchronization source indicating an error */
501 #define AUDIO_HW_SYNC_INVALID 0
503 static inline bool audio_is_output_device(audio_devices_t device)
505 if (((device & AUDIO_DEVICE_BIT_IN) == 0) &&
506 (popcount(device) == 1) && ((device & ~AUDIO_DEVICE_OUT_ALL) == 0))
512 static inline bool audio_is_input_device(audio_devices_t device)
514 if ((device & AUDIO_DEVICE_BIT_IN) != 0) {
515 device &= ~AUDIO_DEVICE_BIT_IN;
516 if ((popcount(device) == 1) && ((device & ~AUDIO_DEVICE_IN_ALL) == 0))
522 static inline bool audio_is_output_devices(audio_devices_t device)
524 return (device & AUDIO_DEVICE_BIT_IN) == 0;
527 static inline bool audio_is_a2dp_in_device(audio_devices_t device)
529 if ((device & AUDIO_DEVICE_BIT_IN) != 0) {
530 device &= ~AUDIO_DEVICE_BIT_IN;
531 if ((popcount(device) == 1) && (device & AUDIO_DEVICE_IN_BLUETOOTH_A2DP))
537 static inline bool audio_is_a2dp_out_device(audio_devices_t device)
539 if ((popcount(device) == 1) && (device & AUDIO_DEVICE_OUT_ALL_A2DP))
545 // Deprecated - use audio_is_a2dp_out_device() instead
546 static inline bool audio_is_a2dp_device(audio_devices_t device)
548 return audio_is_a2dp_out_device(device);
551 static inline bool audio_is_bluetooth_sco_device(audio_devices_t device)
553 if ((device & AUDIO_DEVICE_BIT_IN) == 0) {
554 if ((popcount(device) == 1) && ((device & ~AUDIO_DEVICE_OUT_ALL_SCO) == 0))
557 device &= ~AUDIO_DEVICE_BIT_IN;
558 if ((popcount(device) == 1) && ((device & ~AUDIO_DEVICE_IN_BLUETOOTH_SCO_HEADSET) == 0))
565 static inline bool audio_is_usb_out_device(audio_devices_t device)
567 return ((popcount(device) == 1) && (device & AUDIO_DEVICE_OUT_ALL_USB));
570 static inline bool audio_is_usb_in_device(audio_devices_t device)
572 if ((device & AUDIO_DEVICE_BIT_IN) != 0) {
573 device &= ~AUDIO_DEVICE_BIT_IN;
574 if (popcount(device) == 1 && (device & AUDIO_DEVICE_IN_ALL_USB) != 0)
580 /* OBSOLETE - use audio_is_usb_out_device() instead. */
581 static inline bool audio_is_usb_device(audio_devices_t device)
583 return audio_is_usb_out_device(device);
586 static inline bool audio_is_remote_submix_device(audio_devices_t device)
588 if ((audio_is_output_devices(device) &&
589 (device & AUDIO_DEVICE_OUT_REMOTE_SUBMIX) == AUDIO_DEVICE_OUT_REMOTE_SUBMIX)
590 || (!audio_is_output_devices(device) &&
591 (device & AUDIO_DEVICE_IN_REMOTE_SUBMIX) == AUDIO_DEVICE_IN_REMOTE_SUBMIX))
598 * representation is valid, and
599 * there is at least one channel bit set which _could_ correspond to an input channel, and
600 * there are no channel bits set which could _not_ correspond to an input channel.
601 * Otherwise returns false.
603 static inline bool audio_is_input_channel(audio_channel_mask_t channel)
605 uint32_t bits = audio_channel_mask_get_bits(channel);
606 switch (audio_channel_mask_get_representation(channel)) {
607 case AUDIO_CHANNEL_REPRESENTATION_POSITION:
608 if (bits & ~AUDIO_CHANNEL_IN_ALL) {
612 case AUDIO_CHANNEL_REPRESENTATION_INDEX:
620 * representation is valid, and
621 * there is at least one channel bit set which _could_ correspond to an output channel, and
622 * there are no channel bits set which could _not_ correspond to an output channel.
623 * Otherwise returns false.
625 static inline bool audio_is_output_channel(audio_channel_mask_t channel)
627 uint32_t bits = audio_channel_mask_get_bits(channel);
628 switch (audio_channel_mask_get_representation(channel)) {
629 case AUDIO_CHANNEL_REPRESENTATION_POSITION:
630 if (bits & ~AUDIO_CHANNEL_OUT_ALL) {
634 case AUDIO_CHANNEL_REPRESENTATION_INDEX:
641 /* Returns the number of channels from an input channel mask,
642 * used in the context of audio input or recording.
643 * If a channel bit is set which could _not_ correspond to an input channel,
644 * it is excluded from the count.
645 * Returns zero if the representation is invalid.
647 static inline uint32_t audio_channel_count_from_in_mask(audio_channel_mask_t channel)
649 uint32_t bits = audio_channel_mask_get_bits(channel);
650 switch (audio_channel_mask_get_representation(channel)) {
651 case AUDIO_CHANNEL_REPRESENTATION_POSITION:
652 // TODO: We can now merge with from_out_mask and remove anding
653 bits &= AUDIO_CHANNEL_IN_ALL;
655 case AUDIO_CHANNEL_REPRESENTATION_INDEX:
656 return popcount(bits);
662 /* Returns the number of channels from an output channel mask,
663 * used in the context of audio output or playback.
664 * If a channel bit is set which could _not_ correspond to an output channel,
665 * it is excluded from the count.
666 * Returns zero if the representation is invalid.
668 static inline uint32_t audio_channel_count_from_out_mask(audio_channel_mask_t channel)
670 uint32_t bits = audio_channel_mask_get_bits(channel);
671 switch (audio_channel_mask_get_representation(channel)) {
672 case AUDIO_CHANNEL_REPRESENTATION_POSITION:
673 // TODO: We can now merge with from_in_mask and remove anding
674 bits &= AUDIO_CHANNEL_OUT_ALL;
676 case AUDIO_CHANNEL_REPRESENTATION_INDEX:
677 return popcount(bits);
683 /* Derive a channel mask for index assignment from a channel count.
684 * Returns the matching channel mask,
685 * or AUDIO_CHANNEL_NONE if the channel count is zero,
686 * or AUDIO_CHANNEL_INVALID if the channel count exceeds AUDIO_CHANNEL_COUNT_MAX.
688 static inline audio_channel_mask_t audio_channel_mask_for_index_assignment_from_count(
689 uint32_t channel_count)
691 if (channel_count == 0) {
692 return AUDIO_CHANNEL_NONE;
694 if (channel_count > AUDIO_CHANNEL_COUNT_MAX) {
695 return AUDIO_CHANNEL_INVALID;
697 uint32_t bits = (1 << channel_count) - 1;
698 return audio_channel_mask_from_representation_and_bits(
699 AUDIO_CHANNEL_REPRESENTATION_INDEX, bits);
702 /* Derive an output channel mask for position assignment from a channel count.
703 * This is to be used when the content channel mask is unknown. The 1, 2, 4, 5, 6, 7 and 8 channel
704 * cases are mapped to the standard game/home-theater layouts, but note that 4 is mapped to quad,
705 * and not stereo + FC + mono surround. A channel count of 3 is arbitrarily mapped to stereo + FC
706 * for continuity with stereo.
707 * Returns the matching channel mask,
708 * or AUDIO_CHANNEL_NONE if the channel count is zero,
709 * or AUDIO_CHANNEL_INVALID if the channel count exceeds that of the
710 * configurations for which a default output channel mask is defined.
712 static inline audio_channel_mask_t audio_channel_out_mask_from_count(uint32_t channel_count)
715 switch (channel_count) {
717 return AUDIO_CHANNEL_NONE;
719 bits = AUDIO_CHANNEL_OUT_MONO;
722 bits = AUDIO_CHANNEL_OUT_STEREO;
725 bits = AUDIO_CHANNEL_OUT_STEREO | AUDIO_CHANNEL_OUT_FRONT_CENTER;
728 bits = AUDIO_CHANNEL_OUT_QUAD;
731 bits = AUDIO_CHANNEL_OUT_QUAD | AUDIO_CHANNEL_OUT_FRONT_CENTER;
734 bits = AUDIO_CHANNEL_OUT_5POINT1;
737 bits = AUDIO_CHANNEL_OUT_5POINT1 | AUDIO_CHANNEL_OUT_BACK_CENTER;
740 bits = AUDIO_CHANNEL_OUT_7POINT1;
744 return AUDIO_CHANNEL_INVALID;
746 return audio_channel_mask_from_representation_and_bits(
747 AUDIO_CHANNEL_REPRESENTATION_POSITION, bits);
750 /* Derive a default input channel mask from a channel count.
751 * Assumes a position mask for mono and stereo, or an index mask for channel counts > 2.
752 * Returns the matching channel mask,
753 * or AUDIO_CHANNEL_NONE if the channel count is zero,
754 * or AUDIO_CHANNEL_INVALID if the channel count exceeds that of the
755 * configurations for which a default input channel mask is defined.
757 static inline audio_channel_mask_t audio_channel_in_mask_from_count(uint32_t channel_count)
760 switch (channel_count) {
762 return AUDIO_CHANNEL_NONE;
764 bits = AUDIO_CHANNEL_IN_MONO;
767 bits = AUDIO_CHANNEL_IN_STEREO;
776 return audio_channel_mask_for_index_assignment_from_count(channel_count);
778 return AUDIO_CHANNEL_INVALID;
780 return audio_channel_mask_from_representation_and_bits(
781 AUDIO_CHANNEL_REPRESENTATION_POSITION, bits);
784 static inline bool audio_is_valid_format(audio_format_t format)
786 switch (format & AUDIO_FORMAT_MAIN_MASK) {
787 case AUDIO_FORMAT_PCM:
789 case AUDIO_FORMAT_PCM_16_BIT:
790 case AUDIO_FORMAT_PCM_8_BIT:
791 case AUDIO_FORMAT_PCM_32_BIT:
792 case AUDIO_FORMAT_PCM_8_24_BIT:
793 case AUDIO_FORMAT_PCM_FLOAT:
794 case AUDIO_FORMAT_PCM_24_BIT_PACKED:
800 case AUDIO_FORMAT_MP3:
801 case AUDIO_FORMAT_AMR_NB:
802 case AUDIO_FORMAT_AMR_WB:
803 case AUDIO_FORMAT_AAC:
804 case AUDIO_FORMAT_AAC_ADTS:
805 case AUDIO_FORMAT_HE_AAC_V1:
806 case AUDIO_FORMAT_HE_AAC_V2:
807 case AUDIO_FORMAT_VORBIS:
808 case AUDIO_FORMAT_OPUS:
809 case AUDIO_FORMAT_AC3:
810 case AUDIO_FORMAT_E_AC3:
811 case AUDIO_FORMAT_DTS:
812 case AUDIO_FORMAT_DTS_HD:
813 case AUDIO_FORMAT_IEC61937:
814 case AUDIO_FORMAT_DOLBY_TRUEHD:
815 case AUDIO_FORMAT_QCELP:
816 case AUDIO_FORMAT_EVRC:
817 case AUDIO_FORMAT_EVRCB:
818 case AUDIO_FORMAT_EVRCWB:
819 case AUDIO_FORMAT_AAC_ADIF:
820 case AUDIO_FORMAT_AMR_WB_PLUS:
821 case AUDIO_FORMAT_MP2:
822 case AUDIO_FORMAT_EVRCNW:
823 case AUDIO_FORMAT_FLAC:
824 case AUDIO_FORMAT_ALAC:
825 case AUDIO_FORMAT_APE:
826 case AUDIO_FORMAT_WMA:
827 case AUDIO_FORMAT_WMA_PRO:
828 case AUDIO_FORMAT_DSD:
829 case AUDIO_FORMAT_LDAC:
837 * Extract the primary format, eg. PCM, AC3, etc.
839 static inline audio_format_t audio_get_main_format(audio_format_t format)
841 return (audio_format_t)(format & AUDIO_FORMAT_MAIN_MASK);
845 * Is the data plain PCM samples that can be scaled and mixed?
847 static inline bool audio_is_linear_pcm(audio_format_t format)
849 return (audio_get_main_format(format) == AUDIO_FORMAT_PCM);
853 * For this format, is the number of PCM audio frames directly proportional
854 * to the number of data bytes?
856 * In other words, is the format transported as PCM audio samples,
857 * but not necessarily scalable or mixable.
858 * This returns true for real PCM, but also for AUDIO_FORMAT_IEC61937,
859 * which is transported as 16 bit PCM audio, but where the encoded data
860 * cannot be mixed or scaled.
862 static inline bool audio_has_proportional_frames(audio_format_t format)
864 audio_format_t mainFormat = audio_get_main_format(format);
865 return (mainFormat == AUDIO_FORMAT_PCM
866 || mainFormat == AUDIO_FORMAT_IEC61937);
869 static inline size_t audio_bytes_per_sample(audio_format_t format)
874 case AUDIO_FORMAT_PCM_32_BIT:
875 case AUDIO_FORMAT_PCM_8_24_BIT:
876 size = sizeof(int32_t);
878 case AUDIO_FORMAT_PCM_24_BIT_PACKED:
879 size = sizeof(uint8_t) * 3;
881 case AUDIO_FORMAT_PCM_16_BIT:
882 case AUDIO_FORMAT_IEC61937:
883 size = sizeof(int16_t);
885 case AUDIO_FORMAT_PCM_8_BIT:
886 size = sizeof(uint8_t);
888 case AUDIO_FORMAT_PCM_FLOAT:
889 size = sizeof(float);
897 /* converts device address to string sent to audio HAL via set_parameters */
898 static inline char *audio_device_address_to_parameter(audio_devices_t device, const char *address)
900 const size_t kSize = AUDIO_DEVICE_MAX_ADDRESS_LEN + sizeof("a2dp_sink_address=");
903 if (device & AUDIO_DEVICE_OUT_ALL_A2DP)
904 snprintf(param, kSize, "%s=%s", "a2dp_sink_address", address);
905 else if (device & AUDIO_DEVICE_OUT_REMOTE_SUBMIX)
906 snprintf(param, kSize, "%s=%s", "mix", address);
908 snprintf(param, kSize, "%s", address);
910 return strdup(param);
913 static inline bool audio_device_is_digital(audio_devices_t device) {
914 if ((device & AUDIO_DEVICE_BIT_IN) != 0) {
916 return (~AUDIO_DEVICE_BIT_IN & device & (AUDIO_DEVICE_IN_ALL_USB |
917 AUDIO_DEVICE_IN_HDMI |
918 AUDIO_DEVICE_IN_SPDIF |
920 AUDIO_DEVICE_IN_BUS)) != 0;
923 return (device & (AUDIO_DEVICE_OUT_ALL_USB |
924 AUDIO_DEVICE_OUT_HDMI |
925 AUDIO_DEVICE_OUT_HDMI_ARC |
926 AUDIO_DEVICE_OUT_SPDIF |
927 AUDIO_DEVICE_OUT_IP |
928 AUDIO_DEVICE_OUT_BUS)) != 0;
932 // Unique effect ID (can be generated from the following site:
933 // http://www.itu.int/ITU-T/asn1/uuid.html)
934 // This struct is used for effects identification and in soundtrigger.
935 typedef struct audio_uuid_s {
938 uint16_t timeHiAndVersion;
946 * List of known audio HAL modules. This is the base name of the audio HAL
947 * library composed of the "audio." prefix, one of the base names below and
948 * a suffix specific to the device.
949 * e.g: audio.primary.goldfish.so or audio.a2dp.default.so
951 * The same module names are used in audio policy configuration files.
954 #define AUDIO_HARDWARE_MODULE_ID_PRIMARY "primary"
955 #define AUDIO_HARDWARE_MODULE_ID_A2DP "a2dp"
956 #define AUDIO_HARDWARE_MODULE_ID_USB "usb"
957 #define AUDIO_HARDWARE_MODULE_ID_REMOTE_SUBMIX "r_submix"
958 #define AUDIO_HARDWARE_MODULE_ID_CODEC_OFFLOAD "codec_offload"
961 * Parameter definitions.
962 * Note that in the framework code it's recommended to use AudioParameter.h
963 * instead of these preprocessor defines, and for sure avoid just copying
964 * the constant values.
967 #define AUDIO_PARAMETER_VALUE_ON "on"
968 #define AUDIO_PARAMETER_VALUE_OFF "off"
971 * audio device parameters
974 /* BT SCO Noise Reduction + Echo Cancellation parameters */
975 #define AUDIO_PARAMETER_KEY_BT_NREC "bt_headset_nrec"
977 /* Get a new HW synchronization source identifier.
978 * Return a valid source (positive integer) or AUDIO_HW_SYNC_INVALID if an error occurs
979 * or no HW sync is available. */
980 #define AUDIO_PARAMETER_HW_AV_SYNC "hw_av_sync"
983 #define AUDIO_PARAMETER_KEY_SCREEN_STATE "screen_state"
986 * audio stream parameters
989 #define AUDIO_PARAMETER_STREAM_ROUTING "routing" /* audio_devices_t */
990 #define AUDIO_PARAMETER_STREAM_FORMAT "format" /* audio_format_t */
991 #define AUDIO_PARAMETER_STREAM_CHANNELS "channels" /* audio_channel_mask_t */
992 #define AUDIO_PARAMETER_STREAM_FRAME_COUNT "frame_count" /* size_t */
993 #define AUDIO_PARAMETER_STREAM_INPUT_SOURCE "input_source" /* audio_source_t */
994 #define AUDIO_PARAMETER_STREAM_SAMPLING_RATE "sampling_rate" /* uint32_t */
996 #define AUDIO_PARAMETER_DEVICE_CONNECT "connect" /* audio_devices_t */
997 #define AUDIO_PARAMETER_DEVICE_DISCONNECT "disconnect" /* audio_devices_t */
999 /* Enable mono audio playback if 1, else should be 0. */
1000 #define AUDIO_PARAMETER_MONO_OUTPUT "mono_output"
1002 /* Set the HW synchronization source for an output stream. */
1003 #define AUDIO_PARAMETER_STREAM_HW_AV_SYNC "hw_av_sync"
1005 /* Query supported formats. The response is a '|' separated list of strings from
1006 * audio_format_t enum e.g: "sup_formats=AUDIO_FORMAT_PCM_16_BIT" */
1007 #define AUDIO_PARAMETER_STREAM_SUP_FORMATS "sup_formats"
1008 /* Query supported channel masks. The response is a '|' separated list of strings from
1009 * audio_channel_mask_t enum e.g: "sup_channels=AUDIO_CHANNEL_OUT_STEREO|AUDIO_CHANNEL_OUT_MONO" */
1010 #define AUDIO_PARAMETER_STREAM_SUP_CHANNELS "sup_channels"
1011 /* Query supported sampling rates. The response is a '|' separated list of integer values e.g:
1012 * "sup_sampling_rates=44100|48000" */
1013 #define AUDIO_PARAMETER_STREAM_SUP_SAMPLING_RATES "sup_sampling_rates"
1015 #define AUDIO_PARAMETER_VALUE_LIST_SEPARATOR "|"
1018 * audio codec parameters
1021 #define AUDIO_OFFLOAD_CODEC_PARAMS "music_offload_codec_param"
1022 #define AUDIO_OFFLOAD_CODEC_BIT_PER_SAMPLE "music_offload_bit_per_sample"
1023 #define AUDIO_OFFLOAD_CODEC_BIT_RATE "music_offload_bit_rate"
1024 #define AUDIO_OFFLOAD_CODEC_AVG_BIT_RATE "music_offload_avg_bit_rate"
1025 #define AUDIO_OFFLOAD_CODEC_ID "music_offload_codec_id"
1026 #define AUDIO_OFFLOAD_CODEC_BLOCK_ALIGN "music_offload_block_align"
1027 #define AUDIO_OFFLOAD_CODEC_SAMPLE_RATE "music_offload_sample_rate"
1028 #define AUDIO_OFFLOAD_CODEC_ENCODE_OPTION "music_offload_encode_option"
1029 #define AUDIO_OFFLOAD_CODEC_NUM_CHANNEL "music_offload_num_channels"
1030 #define AUDIO_OFFLOAD_CODEC_DOWN_SAMPLING "music_offload_down_sampling"
1031 #define AUDIO_OFFLOAD_CODEC_DELAY_SAMPLES "delay_samples"
1032 #define AUDIO_OFFLOAD_CODEC_PADDING_SAMPLES "padding_samples"
1035 #endif // ANDROID_AUDIO_CORE_H