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 /* Do not change these values without updating their counterparts
61 * in frameworks/base/media/java/android/media/AudioAttributes.java
64 AUDIO_USAGE_UNKNOWN = 0,
65 AUDIO_USAGE_MEDIA = 1,
66 AUDIO_USAGE_VOICE_COMMUNICATION = 2,
67 AUDIO_USAGE_VOICE_COMMUNICATION_SIGNALLING = 3,
68 AUDIO_USAGE_ALARM = 4,
69 AUDIO_USAGE_NOTIFICATION = 5,
70 AUDIO_USAGE_NOTIFICATION_TELEPHONY_RINGTONE = 6,
71 AUDIO_USAGE_NOTIFICATION_COMMUNICATION_REQUEST = 7,
72 AUDIO_USAGE_NOTIFICATION_COMMUNICATION_INSTANT = 8,
73 AUDIO_USAGE_NOTIFICATION_COMMUNICATION_DELAYED = 9,
74 AUDIO_USAGE_NOTIFICATION_EVENT = 10,
75 AUDIO_USAGE_ASSISTANCE_ACCESSIBILITY = 11,
76 AUDIO_USAGE_ASSISTANCE_NAVIGATION_GUIDANCE = 12,
77 AUDIO_USAGE_ASSISTANCE_SONIFICATION = 13,
78 AUDIO_USAGE_GAME = 14,
79 AUDIO_USAGE_VIRTUAL_SOURCE = 15,
82 AUDIO_USAGE_MAX = AUDIO_USAGE_CNT - 1,
85 typedef uint32_t audio_flags_mask_t;
87 /* Do not change these values without updating their counterparts
88 * in frameworks/base/media/java/android/media/AudioAttributes.java
91 AUDIO_FLAG_AUDIBILITY_ENFORCED = 0x1,
92 AUDIO_FLAG_SECURE = 0x2,
94 AUDIO_FLAG_BEACON = 0x8,
95 AUDIO_FLAG_HW_AV_SYNC = 0x10,
96 AUDIO_FLAG_HW_HOTWORD = 0x20,
97 AUDIO_FLAG_BYPASS_INTERRUPTION_POLICY = 0x40,
98 AUDIO_FLAG_BYPASS_MUTE = 0x80,
99 AUDIO_FLAG_LOW_LATENCY = 0x100,
102 /* Audio attributes */
103 #define AUDIO_ATTRIBUTES_TAGS_MAX_SIZE 256
105 audio_content_type_t content_type;
107 audio_source_t source;
108 audio_flags_mask_t flags;
109 char tags[AUDIO_ATTRIBUTES_TAGS_MAX_SIZE]; /* UTF8 */
110 } audio_attributes_t;
112 /* a unique ID allocated by AudioFlinger for use as an audio_io_handle_t, audio_session_t,
113 * effect ID (int), audio_module_handle_t, and audio_patch_handle_t.
114 * Audio port IDs (audio_port_handle_t) are allocated by AudioPolicy
115 * in a different namespace than AudioFlinger unique IDs.
117 typedef int audio_unique_id_t;
119 /* Possible uses for an audio_unique_id_t */
121 AUDIO_UNIQUE_ID_USE_UNSPECIFIED = 0,
122 AUDIO_UNIQUE_ID_USE_SESSION = 1, // for allocated sessions, not special AUDIO_SESSION_*
123 AUDIO_UNIQUE_ID_USE_MODULE = 2,
124 AUDIO_UNIQUE_ID_USE_EFFECT = 3,
125 AUDIO_UNIQUE_ID_USE_PATCH = 4,
126 AUDIO_UNIQUE_ID_USE_OUTPUT = 5,
127 AUDIO_UNIQUE_ID_USE_INPUT = 6,
129 AUDIO_UNIQUE_ID_USE_MAX = 8, // must be a power-of-two
130 AUDIO_UNIQUE_ID_USE_MASK = AUDIO_UNIQUE_ID_USE_MAX - 1
131 } audio_unique_id_use_t;
133 /* Return the use of an audio_unique_id_t */
134 static inline audio_unique_id_use_t audio_unique_id_get_use(audio_unique_id_t id)
136 return (audio_unique_id_use_t) (id & AUDIO_UNIQUE_ID_USE_MASK);
139 /* Reserved audio_unique_id_t values. FIXME: not a complete list. */
140 #define AUDIO_UNIQUE_ID_ALLOCATE AUDIO_SESSION_ALLOCATE
142 /* A channel mask per se only defines the presence or absence of a channel, not the order.
143 * But see AUDIO_INTERLEAVE_* below for the platform convention of order.
145 * audio_channel_mask_t is an opaque type and its internal layout should not
146 * be assumed as it may change in the future.
147 * Instead, always use the functions declared in this header to examine.
149 * These are the current representations:
151 * AUDIO_CHANNEL_REPRESENTATION_POSITION
152 * is a channel mask representation for position assignment.
153 * Each low-order bit corresponds to the spatial position of a transducer (output),
154 * or interpretation of channel (input).
155 * The user of a channel mask needs to know the context of whether it is for output or input.
156 * The constants AUDIO_CHANNEL_OUT_* or AUDIO_CHANNEL_IN_* apply to the bits portion.
157 * It is not permitted for no bits to be set.
159 * AUDIO_CHANNEL_REPRESENTATION_INDEX
160 * is a channel mask representation for index assignment.
161 * Each low-order bit corresponds to a selected channel.
162 * There is no platform interpretation of the various bits.
163 * There is no concept of output or input.
164 * It is not permitted for no bits to be set.
166 * All other representations are reserved for future use.
168 * Warning: current representation distinguishes between input and output, but this will not the be
169 * case in future revisions of the platform. Wherever there is an ambiguity between input and output
170 * that is currently resolved by checking the channel mask, the implementer should look for ways to
171 * fix it with additional information outside of the mask.
173 typedef uint32_t audio_channel_mask_t;
175 /* log(2) of maximum number of representations, not part of public API */
176 #define AUDIO_CHANNEL_REPRESENTATION_LOG2 2
178 /* The return value is undefined if the channel mask is invalid. */
179 static inline uint32_t audio_channel_mask_get_bits(audio_channel_mask_t channel)
181 return channel & ((1 << AUDIO_CHANNEL_COUNT_MAX) - 1);
184 typedef uint32_t audio_channel_representation_t;
186 /* The return value is undefined if the channel mask is invalid. */
187 static inline audio_channel_representation_t audio_channel_mask_get_representation(
188 audio_channel_mask_t channel)
190 // The right shift should be sufficient, but also "and" for safety in case mask is not 32 bits
191 return (audio_channel_representation_t)
192 ((channel >> AUDIO_CHANNEL_COUNT_MAX) & ((1 << AUDIO_CHANNEL_REPRESENTATION_LOG2) - 1));
195 /* Returns true if the channel mask is valid,
196 * or returns false for AUDIO_CHANNEL_NONE, AUDIO_CHANNEL_INVALID, and other invalid values.
197 * This function is unable to determine whether a channel mask for position assignment
198 * is invalid because an output mask has an invalid output bit set,
199 * or because an input mask has an invalid input bit set.
200 * All other APIs that take a channel mask assume that it is valid.
202 static inline bool audio_channel_mask_is_valid(audio_channel_mask_t channel)
204 uint32_t bits = audio_channel_mask_get_bits(channel);
205 audio_channel_representation_t representation = audio_channel_mask_get_representation(channel);
206 switch (representation) {
207 case AUDIO_CHANNEL_REPRESENTATION_POSITION:
208 case AUDIO_CHANNEL_REPRESENTATION_INDEX:
217 /* Not part of public API */
218 static inline audio_channel_mask_t audio_channel_mask_from_representation_and_bits(
219 audio_channel_representation_t representation, uint32_t bits)
221 return (audio_channel_mask_t) ((representation << AUDIO_CHANNEL_COUNT_MAX) | bits);
224 /* This enum is deprecated */
226 AUDIO_IN_ACOUSTICS_NONE = 0,
227 AUDIO_IN_ACOUSTICS_AGC_ENABLE = 0x0001,
228 AUDIO_IN_ACOUSTICS_AGC_DISABLE = 0,
229 AUDIO_IN_ACOUSTICS_NS_ENABLE = 0x0002,
230 AUDIO_IN_ACOUSTICS_NS_DISABLE = 0,
231 AUDIO_IN_ACOUSTICS_TX_IIR_ENABLE = 0x0004,
232 AUDIO_IN_ACOUSTICS_TX_DISABLE = 0,
233 } audio_in_acoustics_t;
235 typedef uint32_t audio_devices_t;
237 * Stub audio output device. Used in policy configuration file on platforms without audio outputs.
238 * This alias value to AUDIO_DEVICE_OUT_DEFAULT is only used in the audio policy context.
240 #define AUDIO_DEVICE_OUT_STUB AUDIO_DEVICE_OUT_DEFAULT
242 * Stub audio input device. Used in policy configuration file on platforms without audio inputs.
243 * This alias value to AUDIO_DEVICE_IN_DEFAULT is only used in the audio policy context.
245 #define AUDIO_DEVICE_IN_STUB AUDIO_DEVICE_IN_DEFAULT
247 /* Additional information about compressed streams offloaded to
249 * The version and size fields must be initialized by the caller by using
250 * one of the constants defined here.
253 uint16_t version; // version of the info structure
254 uint16_t size; // total size of the structure including version and size
255 uint32_t sample_rate; // sample rate in Hz
256 audio_channel_mask_t channel_mask; // channel mask
257 audio_format_t format; // audio format
258 audio_stream_type_t stream_type; // stream type
259 uint32_t bit_rate; // bit rate in bits per second
260 int64_t duration_us; // duration in microseconds, -1 if unknown
261 bool has_video; // true if stream is tied to a video stream
262 bool is_streaming; // true if streaming, false if local playback
263 } audio_offload_info_t;
265 #define AUDIO_MAKE_OFFLOAD_INFO_VERSION(maj,min) \
266 ((((maj) & 0xff) << 8) | ((min) & 0xff))
268 #define AUDIO_OFFLOAD_INFO_VERSION_0_1 AUDIO_MAKE_OFFLOAD_INFO_VERSION(0, 1)
269 #define AUDIO_OFFLOAD_INFO_VERSION_CURRENT AUDIO_OFFLOAD_INFO_VERSION_0_1
271 static const audio_offload_info_t AUDIO_INFO_INITIALIZER = {
272 /* .version = */ AUDIO_OFFLOAD_INFO_VERSION_CURRENT,
273 /* .size = */ sizeof(audio_offload_info_t),
274 /* .sample_rate = */ 0,
275 /* .channel_mask = */ 0,
276 /* .format = */ AUDIO_FORMAT_DEFAULT,
277 /* .stream_type = */ AUDIO_STREAM_VOICE_CALL,
279 /* .duration_us = */ 0,
280 /* .has_video = */ false,
281 /* .is_streaming = */ false
284 /* common audio stream configuration parameters
285 * You should memset() the entire structure to zero before use to
286 * ensure forward compatibility
288 struct audio_config {
289 uint32_t sample_rate;
290 audio_channel_mask_t channel_mask;
291 audio_format_t format;
292 audio_offload_info_t offload_info;
295 typedef struct audio_config audio_config_t;
297 static const audio_config_t AUDIO_CONFIG_INITIALIZER = {
298 /* .sample_rate = */ 0,
299 /* .channel_mask = */ AUDIO_CHANNEL_NONE,
300 /* .format = */ AUDIO_FORMAT_DEFAULT,
301 /* .offload_info = */ {
302 /* .version = */ AUDIO_OFFLOAD_INFO_VERSION_CURRENT,
303 /* .size = */ sizeof(audio_offload_info_t),
304 /* .sample_rate = */ 0,
305 /* .channel_mask = */ 0,
306 /* .format = */ AUDIO_FORMAT_DEFAULT,
307 /* .stream_type = */ AUDIO_STREAM_VOICE_CALL,
309 /* .duration_us = */ 0,
310 /* .has_video = */ false,
311 /* .is_streaming = */ false
313 /* .frame_count = */ 0,
316 struct audio_config_base {
317 uint32_t sample_rate;
318 audio_channel_mask_t channel_mask;
319 audio_format_t format;
322 typedef struct audio_config_base audio_config_base_t;
324 static const audio_config_base_t AUDIO_CONFIG_BASE_INITIALIZER = {
325 /* .sample_rate = */ 0,
326 /* .channel_mask = */ AUDIO_CHANNEL_NONE,
327 /* .format = */ AUDIO_FORMAT_DEFAULT
330 /* audio hw module handle functions or structures referencing a module */
331 typedef int audio_module_handle_t;
333 /******************************
335 *****************************/
337 /* If the audio hardware supports gain control on some audio paths,
338 * the platform can expose them in the audio_policy.conf file. The audio HAL
339 * will then implement gain control functions that will use the following data
342 typedef uint32_t audio_gain_mode_t;
345 /* An audio_gain struct is a representation of a gain stage.
346 * A gain stage is always attached to an audio port. */
348 audio_gain_mode_t mode; /* e.g. AUDIO_GAIN_MODE_JOINT */
349 audio_channel_mask_t channel_mask; /* channels which gain an be controlled.
350 N/A if AUDIO_GAIN_MODE_CHANNELS is not supported */
351 int min_value; /* minimum gain value in millibels */
352 int max_value; /* maximum gain value in millibels */
353 int default_value; /* default gain value in millibels */
354 unsigned int step_value; /* gain step in millibels */
355 unsigned int min_ramp_ms; /* minimum ramp duration in ms */
356 unsigned int max_ramp_ms; /* maximum ramp duration in ms */
359 /* The gain configuration structure is used to get or set the gain values of a
361 struct audio_gain_config {
362 int index; /* index of the corresponding audio_gain in the
363 audio_port gains[] table */
364 audio_gain_mode_t mode; /* mode requested for this command */
365 audio_channel_mask_t channel_mask; /* channels which gain value follows.
368 // note this "8" is not FCC_8, so it won't need to be changed for > 8 channels
369 int values[sizeof(audio_channel_mask_t) * 8]; /* gain values in millibels
370 for each channel ordered from LSb to MSb in
371 channel mask. The number of values is 1 in joint
372 mode or popcount(channel_mask) */
373 unsigned int ramp_duration_ms; /* ramp duration in ms */
376 /******************************
378 *****************************/
380 /* Types defined here are used to describe an audio source or sink at internal
381 * framework interfaces (audio policy, patch panel) or at the audio HAL.
382 * Sink and sources are grouped in a concept of “audio port” representing an
383 * audio end point at the edge of the system managed by the module exposing
386 /* Each port has a unique ID or handle allocated by policy manager */
387 typedef int audio_port_handle_t;
389 /* the maximum length for the human-readable device name */
390 #define AUDIO_PORT_MAX_NAME_LEN 128
392 /* maximum audio device address length */
393 #define AUDIO_DEVICE_MAX_ADDRESS_LEN 32
395 /* extension for audio port configuration structure when the audio port is a
397 struct audio_port_config_device_ext {
398 audio_module_handle_t hw_module; /* module the device is attached to */
399 audio_devices_t type; /* device type (e.g AUDIO_DEVICE_OUT_SPEAKER) */
400 char address[AUDIO_DEVICE_MAX_ADDRESS_LEN]; /* device address. "" if N/A */
403 /* extension for audio port configuration structure when the audio port is a
405 struct audio_port_config_mix_ext {
406 audio_module_handle_t hw_module; /* module the stream is attached to */
407 audio_io_handle_t handle; /* I/O handle of the input/output stream */
409 //TODO: change use case for output streams: use strategy and mixer attributes
410 audio_stream_type_t stream;
411 audio_source_t source;
415 /* extension for audio port configuration structure when the audio port is an
417 struct audio_port_config_session_ext {
418 audio_session_t session; /* audio session */
421 /* audio port configuration structure used to specify a particular configuration of
423 struct audio_port_config {
424 audio_port_handle_t id; /* port unique ID */
425 audio_port_role_t role; /* sink or source */
426 audio_port_type_t type; /* device, mix ... */
427 unsigned int config_mask; /* e.g AUDIO_PORT_CONFIG_ALL */
428 unsigned int sample_rate; /* sampling rate in Hz */
429 audio_channel_mask_t channel_mask; /* channel mask if applicable */
430 audio_format_t format; /* format if applicable */
431 struct audio_gain_config gain; /* gain to apply if applicable */
433 struct audio_port_config_device_ext device; /* device specific info */
434 struct audio_port_config_mix_ext mix; /* mix specific info */
435 struct audio_port_config_session_ext session; /* session specific info */
440 /* max number of sampling rates in audio port */
441 #define AUDIO_PORT_MAX_SAMPLING_RATES 16
442 /* max number of channel masks in audio port */
443 #define AUDIO_PORT_MAX_CHANNEL_MASKS 16
444 /* max number of audio formats in audio port */
445 #define AUDIO_PORT_MAX_FORMATS 16
446 /* max number of gain controls in audio port */
447 #define AUDIO_PORT_MAX_GAINS 16
449 /* extension for audio port structure when the audio port is a hardware device */
450 struct audio_port_device_ext {
451 audio_module_handle_t hw_module; /* module the device is attached to */
452 audio_devices_t type; /* device type (e.g AUDIO_DEVICE_OUT_SPEAKER) */
453 char address[AUDIO_DEVICE_MAX_ADDRESS_LEN];
456 /* extension for audio port structure when the audio port is a sub mix */
457 struct audio_port_mix_ext {
458 audio_module_handle_t hw_module; /* module the stream is attached to */
459 audio_io_handle_t handle; /* I/O handle of the input.output stream */
460 audio_mix_latency_class_t latency_class; /* latency class */
461 // other attributes: routing strategies
464 /* extension for audio port structure when the audio port is an audio session */
465 struct audio_port_session_ext {
466 audio_session_t session; /* audio session */
470 audio_port_handle_t id; /* port unique ID */
471 audio_port_role_t role; /* sink or source */
472 audio_port_type_t type; /* device, mix ... */
473 char name[AUDIO_PORT_MAX_NAME_LEN];
474 unsigned int num_sample_rates; /* number of sampling rates in following array */
475 unsigned int sample_rates[AUDIO_PORT_MAX_SAMPLING_RATES];
476 unsigned int num_channel_masks; /* number of channel masks in following array */
477 audio_channel_mask_t channel_masks[AUDIO_PORT_MAX_CHANNEL_MASKS];
478 unsigned int num_formats; /* number of formats in following array */
479 audio_format_t formats[AUDIO_PORT_MAX_FORMATS];
480 unsigned int num_gains; /* number of gains in following array */
481 struct audio_gain gains[AUDIO_PORT_MAX_GAINS];
482 struct audio_port_config active_config; /* current audio port configuration */
484 struct audio_port_device_ext device;
485 struct audio_port_mix_ext mix;
486 struct audio_port_session_ext session;
490 /* An audio patch represents a connection between one or more source ports and
491 * one or more sink ports. Patches are connected and disconnected by audio policy manager or by
492 * applications via framework APIs.
493 * Each patch is identified by a handle at the interface used to create that patch. For instance,
494 * when a patch is created by the audio HAL, the HAL allocates and returns a handle.
495 * This handle is unique to a given audio HAL hardware module.
496 * But the same patch receives another system wide unique handle allocated by the framework.
497 * This unique handle is used for all transactions inside the framework.
499 typedef int audio_patch_handle_t;
501 #define AUDIO_PATCH_PORTS_MAX 16
504 audio_patch_handle_t id; /* patch unique ID */
505 unsigned int num_sources; /* number of sources in following array */
506 struct audio_port_config sources[AUDIO_PATCH_PORTS_MAX];
507 unsigned int num_sinks; /* number of sinks in following array */
508 struct audio_port_config sinks[AUDIO_PATCH_PORTS_MAX];
513 /* a HW synchronization source returned by the audio HAL */
514 typedef uint32_t audio_hw_sync_t;
516 /* an invalid HW synchronization source indicating an error */
517 #define AUDIO_HW_SYNC_INVALID 0
519 static inline bool audio_is_output_device(audio_devices_t device)
521 if (((device & AUDIO_DEVICE_BIT_IN) == 0) &&
522 (popcount(device) == 1) && ((device & ~AUDIO_DEVICE_OUT_ALL) == 0))
528 static inline bool audio_is_input_device(audio_devices_t device)
530 if ((device & AUDIO_DEVICE_BIT_IN) != 0) {
531 device &= ~AUDIO_DEVICE_BIT_IN;
532 if ((popcount(device) == 1) && ((device & ~AUDIO_DEVICE_IN_ALL) == 0))
538 static inline bool audio_is_output_devices(audio_devices_t device)
540 return (device & AUDIO_DEVICE_BIT_IN) == 0;
543 static inline bool audio_is_a2dp_in_device(audio_devices_t device)
545 if ((device & AUDIO_DEVICE_BIT_IN) != 0) {
546 device &= ~AUDIO_DEVICE_BIT_IN;
547 if ((popcount(device) == 1) && (device & AUDIO_DEVICE_IN_BLUETOOTH_A2DP))
553 static inline bool audio_is_a2dp_out_device(audio_devices_t device)
555 if ((popcount(device) == 1) && (device & AUDIO_DEVICE_OUT_ALL_A2DP))
561 // Deprecated - use audio_is_a2dp_out_device() instead
562 static inline bool audio_is_a2dp_device(audio_devices_t device)
564 return audio_is_a2dp_out_device(device);
567 static inline bool audio_is_bluetooth_sco_device(audio_devices_t device)
569 if ((device & AUDIO_DEVICE_BIT_IN) == 0) {
570 if ((popcount(device) == 1) && ((device & ~AUDIO_DEVICE_OUT_ALL_SCO) == 0))
573 device &= ~AUDIO_DEVICE_BIT_IN;
574 if ((popcount(device) == 1) && ((device & ~AUDIO_DEVICE_IN_BLUETOOTH_SCO_HEADSET) == 0))
581 static inline bool audio_is_usb_out_device(audio_devices_t device)
583 return ((popcount(device) == 1) && (device & AUDIO_DEVICE_OUT_ALL_USB));
586 static inline bool audio_is_usb_in_device(audio_devices_t device)
588 if ((device & AUDIO_DEVICE_BIT_IN) != 0) {
589 device &= ~AUDIO_DEVICE_BIT_IN;
590 if (popcount(device) == 1 && (device & AUDIO_DEVICE_IN_ALL_USB) != 0)
596 /* OBSOLETE - use audio_is_usb_out_device() instead. */
597 static inline bool audio_is_usb_device(audio_devices_t device)
599 return audio_is_usb_out_device(device);
602 static inline bool audio_is_remote_submix_device(audio_devices_t device)
604 if ((audio_is_output_devices(device) &&
605 (device & AUDIO_DEVICE_OUT_REMOTE_SUBMIX) == AUDIO_DEVICE_OUT_REMOTE_SUBMIX)
606 || (!audio_is_output_devices(device) &&
607 (device & AUDIO_DEVICE_IN_REMOTE_SUBMIX) == AUDIO_DEVICE_IN_REMOTE_SUBMIX))
614 * representation is valid, and
615 * there is at least one channel bit set which _could_ correspond to an input channel, and
616 * there are no channel bits set which could _not_ correspond to an input channel.
617 * Otherwise returns false.
619 static inline bool audio_is_input_channel(audio_channel_mask_t channel)
621 uint32_t bits = audio_channel_mask_get_bits(channel);
622 switch (audio_channel_mask_get_representation(channel)) {
623 case AUDIO_CHANNEL_REPRESENTATION_POSITION:
624 if (bits & ~AUDIO_CHANNEL_IN_ALL) {
628 case AUDIO_CHANNEL_REPRESENTATION_INDEX:
636 * representation is valid, and
637 * there is at least one channel bit set which _could_ correspond to an output channel, and
638 * there are no channel bits set which could _not_ correspond to an output channel.
639 * Otherwise returns false.
641 static inline bool audio_is_output_channel(audio_channel_mask_t channel)
643 uint32_t bits = audio_channel_mask_get_bits(channel);
644 switch (audio_channel_mask_get_representation(channel)) {
645 case AUDIO_CHANNEL_REPRESENTATION_POSITION:
646 if (bits & ~AUDIO_CHANNEL_OUT_ALL) {
650 case AUDIO_CHANNEL_REPRESENTATION_INDEX:
657 /* Returns the number of channels from an input channel mask,
658 * used in the context of audio input or recording.
659 * If a channel bit is set which could _not_ correspond to an input channel,
660 * it is excluded from the count.
661 * Returns zero if the representation is invalid.
663 static inline uint32_t audio_channel_count_from_in_mask(audio_channel_mask_t channel)
665 uint32_t bits = audio_channel_mask_get_bits(channel);
666 switch (audio_channel_mask_get_representation(channel)) {
667 case AUDIO_CHANNEL_REPRESENTATION_POSITION:
668 // TODO: We can now merge with from_out_mask and remove anding
669 bits &= AUDIO_CHANNEL_IN_ALL;
671 case AUDIO_CHANNEL_REPRESENTATION_INDEX:
672 return popcount(bits);
678 /* Returns the number of channels from an output channel mask,
679 * used in the context of audio output or playback.
680 * If a channel bit is set which could _not_ correspond to an output channel,
681 * it is excluded from the count.
682 * Returns zero if the representation is invalid.
684 static inline uint32_t audio_channel_count_from_out_mask(audio_channel_mask_t channel)
686 uint32_t bits = audio_channel_mask_get_bits(channel);
687 switch (audio_channel_mask_get_representation(channel)) {
688 case AUDIO_CHANNEL_REPRESENTATION_POSITION:
689 // TODO: We can now merge with from_in_mask and remove anding
690 bits &= AUDIO_CHANNEL_OUT_ALL;
692 case AUDIO_CHANNEL_REPRESENTATION_INDEX:
693 return popcount(bits);
699 /* Derive a channel mask for index assignment from a channel count.
700 * Returns the matching channel mask,
701 * or AUDIO_CHANNEL_NONE if the channel count is zero,
702 * or AUDIO_CHANNEL_INVALID if the channel count exceeds AUDIO_CHANNEL_COUNT_MAX.
704 static inline audio_channel_mask_t audio_channel_mask_for_index_assignment_from_count(
705 uint32_t channel_count)
707 if (channel_count == 0) {
708 return AUDIO_CHANNEL_NONE;
710 if (channel_count > AUDIO_CHANNEL_COUNT_MAX) {
711 return AUDIO_CHANNEL_INVALID;
713 uint32_t bits = (1 << channel_count) - 1;
714 return audio_channel_mask_from_representation_and_bits(
715 AUDIO_CHANNEL_REPRESENTATION_INDEX, bits);
718 /* Derive an output channel mask for position assignment from a channel count.
719 * This is to be used when the content channel mask is unknown. The 1, 2, 4, 5, 6, 7 and 8 channel
720 * cases are mapped to the standard game/home-theater layouts, but note that 4 is mapped to quad,
721 * and not stereo + FC + mono surround. A channel count of 3 is arbitrarily mapped to stereo + FC
722 * for continuity with stereo.
723 * Returns the matching channel mask,
724 * or AUDIO_CHANNEL_NONE if the channel count is zero,
725 * or AUDIO_CHANNEL_INVALID if the channel count exceeds that of the
726 * configurations for which a default output channel mask is defined.
728 static inline audio_channel_mask_t audio_channel_out_mask_from_count(uint32_t channel_count)
731 switch (channel_count) {
733 return AUDIO_CHANNEL_NONE;
735 bits = AUDIO_CHANNEL_OUT_MONO;
738 bits = AUDIO_CHANNEL_OUT_STEREO;
741 bits = AUDIO_CHANNEL_OUT_STEREO | AUDIO_CHANNEL_OUT_FRONT_CENTER;
744 bits = AUDIO_CHANNEL_OUT_QUAD;
747 bits = AUDIO_CHANNEL_OUT_QUAD | AUDIO_CHANNEL_OUT_FRONT_CENTER;
750 bits = AUDIO_CHANNEL_OUT_5POINT1;
753 bits = AUDIO_CHANNEL_OUT_5POINT1 | AUDIO_CHANNEL_OUT_BACK_CENTER;
756 bits = AUDIO_CHANNEL_OUT_7POINT1;
760 return AUDIO_CHANNEL_INVALID;
762 return audio_channel_mask_from_representation_and_bits(
763 AUDIO_CHANNEL_REPRESENTATION_POSITION, bits);
766 /* Derive a default input channel mask from a channel count.
767 * Assumes a position mask for mono and stereo, or an index mask for channel counts > 2.
768 * Returns the matching channel mask,
769 * or AUDIO_CHANNEL_NONE if the channel count is zero,
770 * or AUDIO_CHANNEL_INVALID if the channel count exceeds that of the
771 * configurations for which a default input channel mask is defined.
773 static inline audio_channel_mask_t audio_channel_in_mask_from_count(uint32_t channel_count)
776 switch (channel_count) {
778 return AUDIO_CHANNEL_NONE;
780 bits = AUDIO_CHANNEL_IN_MONO;
783 bits = AUDIO_CHANNEL_IN_STEREO;
792 return audio_channel_mask_for_index_assignment_from_count(channel_count);
794 return AUDIO_CHANNEL_INVALID;
796 return audio_channel_mask_from_representation_and_bits(
797 AUDIO_CHANNEL_REPRESENTATION_POSITION, bits);
800 static inline bool audio_is_valid_format(audio_format_t format)
802 switch (format & AUDIO_FORMAT_MAIN_MASK) {
803 case AUDIO_FORMAT_PCM:
805 case AUDIO_FORMAT_PCM_16_BIT:
806 case AUDIO_FORMAT_PCM_8_BIT:
807 case AUDIO_FORMAT_PCM_32_BIT:
808 case AUDIO_FORMAT_PCM_8_24_BIT:
809 case AUDIO_FORMAT_PCM_FLOAT:
810 case AUDIO_FORMAT_PCM_24_BIT_PACKED:
816 case AUDIO_FORMAT_MP3:
817 case AUDIO_FORMAT_AMR_NB:
818 case AUDIO_FORMAT_AMR_WB:
819 case AUDIO_FORMAT_AAC:
820 case AUDIO_FORMAT_HE_AAC_V1:
821 case AUDIO_FORMAT_HE_AAC_V2:
822 case AUDIO_FORMAT_VORBIS:
823 case AUDIO_FORMAT_OPUS:
824 case AUDIO_FORMAT_AC3:
825 case AUDIO_FORMAT_E_AC3:
826 case AUDIO_FORMAT_DTS:
827 case AUDIO_FORMAT_DTS_HD:
828 case AUDIO_FORMAT_IEC61937:
829 case AUDIO_FORMAT_DOLBY_TRUEHD:
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