*/
-#ifndef ANDROID_AUDIO_CORE_H
-#define ANDROID_AUDIO_CORE_H
+#ifndef ANDROID_AUDIO_HAL_INTERFACE_H
+#define ANDROID_AUDIO_HAL_INTERFACE_H
-#include <stdbool.h>
#include <stdint.h>
+#include <strings.h>
#include <sys/cdefs.h>
#include <sys/types.h>
#include <cutils/bitops.h>
+#include <hardware/hardware.h>
+#include <system/audio.h>
+#include <hardware/audio_effect.h>
+
__BEGIN_DECLS
-/* The enums were moved here mostly from
- * frameworks/base/include/media/AudioSystem.h
+/**
+ * The id of this module
*/
+#define AUDIO_HARDWARE_MODULE_ID "audio"
-typedef int audio_io_handle_t;
-
-/* Audio stream types */
-typedef enum {
- AUDIO_STREAM_DEFAULT = -1,
- AUDIO_STREAM_VOICE_CALL = 0,
- AUDIO_STREAM_SYSTEM = 1,
- AUDIO_STREAM_RING = 2,
- AUDIO_STREAM_MUSIC = 3,
- AUDIO_STREAM_ALARM = 4,
- AUDIO_STREAM_NOTIFICATION = 5,
- AUDIO_STREAM_BLUETOOTH_SCO = 6,
- AUDIO_STREAM_ENFORCED_AUDIBLE = 7, /* Sounds that cannot be muted by user and must be routed to speaker */
- AUDIO_STREAM_DTMF = 8,
- AUDIO_STREAM_TTS = 9,
-
- AUDIO_STREAM_CNT,
- AUDIO_STREAM_MAX = AUDIO_STREAM_CNT - 1,
-} audio_stream_type_t;
-
-/* Do not change these values without updating their counterparts
- * in media/java/android/media/MediaRecorder.java!
+/**
+ * Name of the audio devices to open
*/
-typedef enum {
- AUDIO_SOURCE_DEFAULT = 0,
- AUDIO_SOURCE_MIC = 1,
- AUDIO_SOURCE_VOICE_UPLINK = 2,
- AUDIO_SOURCE_VOICE_DOWNLINK = 3,
- AUDIO_SOURCE_VOICE_CALL = 4,
- AUDIO_SOURCE_CAMCORDER = 5,
- AUDIO_SOURCE_VOICE_RECOGNITION = 6,
- AUDIO_SOURCE_VOICE_COMMUNICATION = 7,
-
- AUDIO_SOURCE_CNT,
- AUDIO_SOURCE_MAX = AUDIO_SOURCE_CNT - 1,
-} audio_source_t;
-
-/* special audio session values
- * (XXX: should this be living in the audio effects land?)
+#define AUDIO_HARDWARE_INTERFACE "audio_hw_if"
+
+/**************************************/
+
+/**
+ * standard audio parameters that the HAL may need to handle
+ */
+
+/**
+ * audio device parameters
+ */
+
+/* BT SCO Noise Reduction + Echo Cancellation parameters */
+#define AUDIO_PARAMETER_KEY_BT_NREC "bt_headset_nrec"
+#define AUDIO_PARAMETER_VALUE_ON "on"
+#define AUDIO_PARAMETER_VALUE_OFF "off"
+
+/* TTY mode selection */
+#define AUDIO_PARAMETER_KEY_TTY_MODE "tty_mode"
+#define AUDIO_PARAMETER_VALUE_TTY_OFF "tty_off"
+#define AUDIO_PARAMETER_VALUE_TTY_VCO "tty_vco"
+#define AUDIO_PARAMETER_VALUE_TTY_HCO "tty_hco"
+#define AUDIO_PARAMETER_VALUE_TTY_FULL "tty_full"
+
+/**
+ * audio stream parameters
*/
-typedef enum {
- /* session for effects attached to a particular output stream
- * (value must be less than 0)
+
+#define AUDIO_PARAMETER_STREAM_ROUTING "routing"
+#define AUDIO_PARAMETER_STREAM_FORMAT "format"
+#define AUDIO_PARAMETER_STREAM_CHANNELS "channels"
+#define AUDIO_PARAMETER_STREAM_FRAME_COUNT "frame_count"
+#define AUDIO_PARAMETER_STREAM_INPUT_SOURCE "input_source"
+
+/**************************************/
+
+/* common audio stream parameters and operations */
+struct audio_stream {
+
+ /**
+ * sampling rate is in Hz - eg. 44100
*/
- AUDIO_SESSION_OUTPUT_STAGE = -1,
+ uint32_t (*get_sample_rate)(const struct audio_stream *stream);
- /* session for effects applied to output mix. These effects can
- * be moved by audio policy manager to another output stream
- * (value must be 0)
+ /* currently unused - use set_parameters with key
+ * AUDIO_PARAMETER_STREAM_SAMPLING_RATE
*/
- AUDIO_SESSION_OUTPUT_MIX = 0,
-} audio_session_t;
+ int (*set_sample_rate)(struct audio_stream *stream, uint32_t rate);
-/* Audio sub formats (see enum audio_format). */
+ /**
+ * size of output buffer in bytes - eg. 4800
+ */
+ size_t (*get_buffer_size)(const struct audio_stream *stream);
-/* PCM sub formats */
-typedef enum {
- AUDIO_FORMAT_PCM_SUB_16_BIT = 0x1, /* DO NOT CHANGE */
- AUDIO_FORMAT_PCM_SUB_8_BIT = 0x2, /* DO NOT CHANGE */
-} audio_format_pcm_sub_fmt_t;
+ /**
+ * the channel mask -
+ * e.g. AUDIO_CHANNEL_OUT_STEREO or AUDIO_CHANNEL_IN_STEREO
+ */
+ uint32_t (*get_channels)(const struct audio_stream *stream);
-/* MP3 sub format field definition : can use 11 LSBs in the same way as MP3
- * frame header to specify bit rate, stereo mode, version...
- */
-typedef enum {
- AUDIO_FORMAT_MP3_SUB_NONE = 0x0,
-} audio_format_mp3_sub_fmt_t;
+ /**
+ * audio format - eg. AUDIO_FORMAT_PCM_16_BIT
+ */
+ int (*get_format)(const struct audio_stream *stream);
-/* AMR NB/WB sub format field definition: specify frame block interleaving,
- * bandwidth efficient or octet aligned, encoding mode for recording...
- */
-typedef enum {
- AUDIO_FORMAT_AMR_SUB_NONE = 0x0,
-} audio_format_amr_sub_fmt_t;
-
-/* AAC sub format field definition: specify profile or bitrate for recording... */
-typedef enum {
- AUDIO_FORMAT_AAC_SUB_NONE = 0x0,
-} audio_format_aac_sub_fmt_t;
-
-/* VORBIS sub format field definition: specify quality for recording... */
-typedef enum {
- AUDIO_FORMAT_VORBIS_SUB_NONE = 0x0,
-} audio_format_vorbis_sub_fmt_t;
-
-/* Audio format consists in a main format field (upper 8 bits) and a sub format
- * field (lower 24 bits).
+ /* currently unused - use set_parameters with key
+ * AUDIO_PARAMETER_STREAM_FORMAT
+ */
+ int (*set_format)(struct audio_stream *stream, int format);
+
+ /**
+ * Put the audio hardware input/output into standby mode.
+ * Returns 0 on success and <0 on failure.
+ */
+ int (*standby)(struct audio_stream *stream);
+
+ /** dump the state of the audio input/output device */
+ int (*dump)(const struct audio_stream *stream, int fd);
+
+ audio_devices_t (*get_device)(const struct audio_stream *stream);
+ int (*set_device)(struct audio_stream *stream, audio_devices_t device);
+
+ /**
+ * 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 (*set_parameters)(struct audio_stream *stream, const char *kv_pairs);
+
+ /*
+ * Returns a pointer to a heap allocated string. The caller is responsible
+ * for freeing the memory for it.
+ */
+ char * (*get_parameters)(const struct audio_stream *stream,
+ const char *keys);
+ int (*add_audio_effect)(const struct audio_stream *stream,
+ effect_handle_t effect);
+ int (*remove_audio_effect)(const struct audio_stream *stream,
+ effect_handle_t effect);
+};
+typedef struct audio_stream audio_stream_t;
+
+/**
+ * audio_stream_out is the abstraction interface for the audio output hardware.
*
- * The main format indicates the main codec type. The sub format field
- * indicates options and parameters for each format. The sub format is mainly
- * used for record to indicate for instance the requested bitrate or profile.
- * It can also be used for certain formats to give informations not present in
- * the encoded audio stream (e.g. octet alignement for AMR).
+ * It provides information about various properties of the audio output
+ * hardware driver.
*/
-typedef enum {
- AUDIO_FORMAT_INVALID = 0xFFFFFFFFUL,
- AUDIO_FORMAT_DEFAULT = 0,
- AUDIO_FORMAT_PCM = 0x00000000UL, /* DO NOT CHANGE */
- AUDIO_FORMAT_MP3 = 0x01000000UL,
- AUDIO_FORMAT_AMR_NB = 0x02000000UL,
- AUDIO_FORMAT_AMR_WB = 0x03000000UL,
- AUDIO_FORMAT_AAC = 0x04000000UL,
- AUDIO_FORMAT_HE_AAC_V1 = 0x05000000UL,
- AUDIO_FORMAT_HE_AAC_V2 = 0x06000000UL,
- AUDIO_FORMAT_VORBIS = 0x07000000UL,
- AUDIO_FORMAT_MAIN_MASK = 0xFF000000UL,
- AUDIO_FORMAT_SUB_MASK = 0x00FFFFFFUL,
-
- /* Aliases */
- AUDIO_FORMAT_PCM_16_BIT = (AUDIO_FORMAT_PCM |
- AUDIO_FORMAT_PCM_SUB_16_BIT),
- AUDIO_FORMAT_PCM_8_BIT = (AUDIO_FORMAT_PCM |
- AUDIO_FORMAT_PCM_SUB_8_BIT),
-} audio_format_t;
-
-/* Channel mask definitions must be kept in sync with JAVA values in
- * frameworks/base/media/java/android/media/AudioFormat.java */
-typedef enum {
- /* output channels */
- AUDIO_CHANNEL_OUT_FRONT_LEFT = 0x4,
- AUDIO_CHANNEL_OUT_FRONT_RIGHT = 0x8,
- AUDIO_CHANNEL_OUT_FRONT_CENTER = 0x10,
- AUDIO_CHANNEL_OUT_LOW_FREQUENCY = 0x20,
- AUDIO_CHANNEL_OUT_BACK_LEFT = 0x40,
- AUDIO_CHANNEL_OUT_BACK_RIGHT = 0x80,
- AUDIO_CHANNEL_OUT_FRONT_LEFT_OF_CENTER = 0x100,
- AUDIO_CHANNEL_OUT_FRONT_RIGHT_OF_CENTER = 0x200,
- AUDIO_CHANNEL_OUT_BACK_CENTER = 0x400,
-
- AUDIO_CHANNEL_OUT_MONO = AUDIO_CHANNEL_OUT_FRONT_LEFT,
- AUDIO_CHANNEL_OUT_STEREO = (AUDIO_CHANNEL_OUT_FRONT_LEFT |
- AUDIO_CHANNEL_OUT_FRONT_RIGHT),
- AUDIO_CHANNEL_OUT_QUAD = (AUDIO_CHANNEL_OUT_FRONT_LEFT |
- AUDIO_CHANNEL_OUT_FRONT_RIGHT |
- AUDIO_CHANNEL_OUT_BACK_LEFT |
- AUDIO_CHANNEL_OUT_BACK_RIGHT),
- AUDIO_CHANNEL_OUT_SURROUND = (AUDIO_CHANNEL_OUT_FRONT_LEFT |
- AUDIO_CHANNEL_OUT_FRONT_RIGHT |
- AUDIO_CHANNEL_OUT_FRONT_CENTER |
- AUDIO_CHANNEL_OUT_BACK_CENTER),
- AUDIO_CHANNEL_OUT_5POINT1 = (AUDIO_CHANNEL_OUT_FRONT_LEFT |
- AUDIO_CHANNEL_OUT_FRONT_RIGHT |
- AUDIO_CHANNEL_OUT_FRONT_CENTER |
- AUDIO_CHANNEL_OUT_LOW_FREQUENCY |
- AUDIO_CHANNEL_OUT_BACK_LEFT |
- AUDIO_CHANNEL_OUT_BACK_RIGHT),
- AUDIO_CHANNEL_OUT_7POINT1 = (AUDIO_CHANNEL_OUT_FRONT_LEFT |
- AUDIO_CHANNEL_OUT_FRONT_RIGHT |
- AUDIO_CHANNEL_OUT_FRONT_CENTER |
- AUDIO_CHANNEL_OUT_LOW_FREQUENCY |
- AUDIO_CHANNEL_OUT_BACK_LEFT |
- AUDIO_CHANNEL_OUT_BACK_RIGHT |
- AUDIO_CHANNEL_OUT_FRONT_LEFT_OF_CENTER |
- AUDIO_CHANNEL_OUT_FRONT_RIGHT_OF_CENTER),
- AUDIO_CHANNEL_OUT_ALL = (AUDIO_CHANNEL_OUT_FRONT_LEFT |
- AUDIO_CHANNEL_OUT_FRONT_RIGHT |
- AUDIO_CHANNEL_OUT_FRONT_CENTER |
- AUDIO_CHANNEL_OUT_LOW_FREQUENCY |
- AUDIO_CHANNEL_OUT_BACK_LEFT |
- AUDIO_CHANNEL_OUT_BACK_RIGHT |
- AUDIO_CHANNEL_OUT_FRONT_LEFT_OF_CENTER |
- AUDIO_CHANNEL_OUT_FRONT_RIGHT_OF_CENTER |
- AUDIO_CHANNEL_OUT_BACK_CENTER),
-
- /* input channels */
- AUDIO_CHANNEL_IN_LEFT = 0x4,
- AUDIO_CHANNEL_IN_RIGHT = 0x8,
- AUDIO_CHANNEL_IN_FRONT = 0x10,
- AUDIO_CHANNEL_IN_BACK = 0x20,
- AUDIO_CHANNEL_IN_LEFT_PROCESSED = 0x40,
- AUDIO_CHANNEL_IN_RIGHT_PROCESSED = 0x80,
- AUDIO_CHANNEL_IN_FRONT_PROCESSED = 0x100,
- AUDIO_CHANNEL_IN_BACK_PROCESSED = 0x200,
- AUDIO_CHANNEL_IN_PRESSURE = 0x400,
- AUDIO_CHANNEL_IN_X_AXIS = 0x800,
- AUDIO_CHANNEL_IN_Y_AXIS = 0x1000,
- AUDIO_CHANNEL_IN_Z_AXIS = 0x2000,
- AUDIO_CHANNEL_IN_VOICE_UPLINK = 0x4000,
- AUDIO_CHANNEL_IN_VOICE_DNLINK = 0x8000,
-
- AUDIO_CHANNEL_IN_MONO = AUDIO_CHANNEL_IN_FRONT,
- AUDIO_CHANNEL_IN_STEREO = (AUDIO_CHANNEL_IN_LEFT | AUDIO_CHANNEL_IN_RIGHT),
- AUDIO_CHANNEL_IN_ALL = (AUDIO_CHANNEL_IN_LEFT |
- AUDIO_CHANNEL_IN_RIGHT |
- AUDIO_CHANNEL_IN_FRONT |
- AUDIO_CHANNEL_IN_BACK|
- AUDIO_CHANNEL_IN_LEFT_PROCESSED |
- AUDIO_CHANNEL_IN_RIGHT_PROCESSED |
- AUDIO_CHANNEL_IN_FRONT_PROCESSED |
- AUDIO_CHANNEL_IN_BACK_PROCESSED|
- AUDIO_CHANNEL_IN_PRESSURE |
- AUDIO_CHANNEL_IN_X_AXIS |
- AUDIO_CHANNEL_IN_Y_AXIS |
- AUDIO_CHANNEL_IN_Z_AXIS |
- AUDIO_CHANNEL_IN_VOICE_UPLINK |
- AUDIO_CHANNEL_IN_VOICE_DNLINK),
-} audio_channels_t;
-
-typedef enum {
- AUDIO_MODE_INVALID = -2,
- AUDIO_MODE_CURRENT = -1,
- AUDIO_MODE_NORMAL = 0,
- AUDIO_MODE_RINGTONE = 1,
- AUDIO_MODE_IN_CALL = 2,
- AUDIO_MODE_IN_COMMUNICATION = 3,
-
- AUDIO_MODE_CNT,
- AUDIO_MODE_MAX = AUDIO_MODE_CNT - 1,
-} audio_mode_t;
-
-typedef enum {
- AUDIO_IN_ACOUSTICS_AGC_ENABLE = 0x0001,
- AUDIO_IN_ACOUSTICS_AGC_DISABLE = 0,
- AUDIO_IN_ACOUSTICS_NS_ENABLE = 0x0002,
- AUDIO_IN_ACOUSTICS_NS_DISABLE = 0,
- AUDIO_IN_ACOUSTICS_TX_IIR_ENABLE = 0x0004,
- AUDIO_IN_ACOUSTICS_TX_DISABLE = 0,
-} audio_in_acoustics_t;
-
-typedef enum {
- /* output devices */
- AUDIO_DEVICE_OUT_EARPIECE = 0x1,
- AUDIO_DEVICE_OUT_SPEAKER = 0x2,
- AUDIO_DEVICE_OUT_WIRED_HEADSET = 0x4,
- AUDIO_DEVICE_OUT_WIRED_HEADPHONE = 0x8,
- AUDIO_DEVICE_OUT_BLUETOOTH_SCO = 0x10,
- AUDIO_DEVICE_OUT_BLUETOOTH_SCO_HEADSET = 0x20,
- AUDIO_DEVICE_OUT_BLUETOOTH_SCO_CARKIT = 0x40,
- AUDIO_DEVICE_OUT_BLUETOOTH_A2DP = 0x80,
- AUDIO_DEVICE_OUT_BLUETOOTH_A2DP_HEADPHONES = 0x100,
- AUDIO_DEVICE_OUT_BLUETOOTH_A2DP_SPEAKER = 0x200,
- AUDIO_DEVICE_OUT_AUX_DIGITAL = 0x400,
- AUDIO_DEVICE_OUT_ANLG_DOCK_HEADSET = 0x800,
- AUDIO_DEVICE_OUT_DGTL_DOCK_HEADSET = 0x1000,
- AUDIO_DEVICE_OUT_DEFAULT = 0x8000,
- AUDIO_DEVICE_OUT_ALL = (AUDIO_DEVICE_OUT_EARPIECE |
- AUDIO_DEVICE_OUT_SPEAKER |
- AUDIO_DEVICE_OUT_WIRED_HEADSET |
- AUDIO_DEVICE_OUT_WIRED_HEADPHONE |
- AUDIO_DEVICE_OUT_BLUETOOTH_SCO |
- AUDIO_DEVICE_OUT_BLUETOOTH_SCO_HEADSET |
- AUDIO_DEVICE_OUT_BLUETOOTH_SCO_CARKIT |
- AUDIO_DEVICE_OUT_BLUETOOTH_A2DP |
- AUDIO_DEVICE_OUT_BLUETOOTH_A2DP_HEADPHONES |
- AUDIO_DEVICE_OUT_BLUETOOTH_A2DP_SPEAKER |
- AUDIO_DEVICE_OUT_AUX_DIGITAL |
- AUDIO_DEVICE_OUT_ANLG_DOCK_HEADSET |
- AUDIO_DEVICE_OUT_DGTL_DOCK_HEADSET |
- AUDIO_DEVICE_OUT_DEFAULT),
- AUDIO_DEVICE_OUT_ALL_A2DP = (AUDIO_DEVICE_OUT_BLUETOOTH_A2DP |
- AUDIO_DEVICE_OUT_BLUETOOTH_A2DP_HEADPHONES |
- AUDIO_DEVICE_OUT_BLUETOOTH_A2DP_SPEAKER),
- AUDIO_DEVICE_OUT_ALL_SCO = (AUDIO_DEVICE_OUT_BLUETOOTH_SCO |
- AUDIO_DEVICE_OUT_BLUETOOTH_SCO_HEADSET |
- AUDIO_DEVICE_OUT_BLUETOOTH_SCO_CARKIT),
-
- /* input devices */
- AUDIO_DEVICE_IN_COMMUNICATION = 0x10000,
- AUDIO_DEVICE_IN_AMBIENT = 0x20000,
- AUDIO_DEVICE_IN_BUILTIN_MIC = 0x40000,
- AUDIO_DEVICE_IN_BLUETOOTH_SCO_HEADSET = 0x80000,
- AUDIO_DEVICE_IN_WIRED_HEADSET = 0x100000,
- AUDIO_DEVICE_IN_AUX_DIGITAL = 0x200000,
- AUDIO_DEVICE_IN_VOICE_CALL = 0x400000,
- AUDIO_DEVICE_IN_BACK_MIC = 0x800000,
- AUDIO_DEVICE_IN_DEFAULT = 0x80000000,
-
- AUDIO_DEVICE_IN_ALL = (AUDIO_DEVICE_IN_COMMUNICATION |
- AUDIO_DEVICE_IN_AMBIENT |
- AUDIO_DEVICE_IN_BUILTIN_MIC |
- AUDIO_DEVICE_IN_BLUETOOTH_SCO_HEADSET |
- AUDIO_DEVICE_IN_WIRED_HEADSET |
- AUDIO_DEVICE_IN_AUX_DIGITAL |
- AUDIO_DEVICE_IN_VOICE_CALL |
- AUDIO_DEVICE_IN_BACK_MIC |
- AUDIO_DEVICE_IN_DEFAULT),
- AUDIO_DEVICE_IN_ALL_SCO = AUDIO_DEVICE_IN_BLUETOOTH_SCO_HEADSET,
-} audio_devices_t;
-
-static inline bool audio_is_output_device(audio_devices_t device)
-{
- if ((popcount(device) == 1) && ((device & ~AUDIO_DEVICE_OUT_ALL) == 0))
- return true;
- else
- return false;
-}
-static inline bool audio_is_input_device(audio_devices_t device)
-{
- if ((popcount(device) == 1) && ((device & ~AUDIO_DEVICE_IN_ALL) == 0))
- return true;
- else
- return false;
-}
+struct audio_stream_out {
+ struct audio_stream common;
-static inline bool audio_is_a2dp_device(audio_devices_t device)
-{
- if ((popcount(device) == 1) && (device & AUDIO_DEVICE_OUT_ALL_A2DP))
- return true;
- else
- return false;
-}
+ /**
+ * return the audio hardware driver latency in milli seconds.
+ */
+ uint32_t (*get_latency)(const struct audio_stream_out *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 (*set_volume)(struct audio_stream_out *stream, float left, float right);
-static inline bool audio_is_bluetooth_sco_device(audio_devices_t device)
-{
- if ((popcount(device) == 1) && (device & (AUDIO_DEVICE_OUT_ALL_SCO |
- AUDIO_DEVICE_IN_BLUETOOTH_SCO_HEADSET)))
- return true;
- else
- return false;
-}
+ /**
+ * write audio buffer to driver. Returns number of bytes written
+ */
+ ssize_t (*write)(struct audio_stream_out *stream, const void* buffer,
+ size_t bytes);
-static inline bool audio_is_input_channel(uint32_t channel)
-{
- if ((channel & ~AUDIO_CHANNEL_IN_ALL) == 0)
- return true;
- else
- return false;
-}
+ /* return the number of audio frames written by the audio dsp to DAC since
+ * the output has exited standby
+ */
+ int (*get_render_position)(const struct audio_stream_out *stream,
+ uint32_t *dsp_frames);
+};
+typedef struct audio_stream_out audio_stream_out_t;
+
+struct audio_stream_in {
+ struct audio_stream common;
+
+ /** set the input gain for the audio driver. This method is for
+ * for future use */
+ int (*set_gain)(struct audio_stream_in *stream, float gain);
+
+ /** read audio buffer in from audio driver */
+ ssize_t (*read)(struct audio_stream_in *stream, void* buffer,
+ size_t bytes);
+
+ /**
+ * 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 (*get_input_frames_lost)(struct audio_stream_in *stream);
+};
+typedef struct audio_stream_in audio_stream_in_t;
-static inline bool audio_is_output_channel(uint32_t channel)
+/**
+ * return the frame size (number of bytes per sample).
+ */
+static inline uint32_t audio_stream_frame_size(struct audio_stream *s)
{
- if ((channel & ~AUDIO_CHANNEL_OUT_ALL) == 0)
- return true;
- else
- return false;
-}
+ int chan_samp_sz;
-static inline bool audio_is_valid_format(uint32_t format)
-{
- switch (format & AUDIO_FORMAT_MAIN_MASK) {
- case AUDIO_FORMAT_PCM:
- case AUDIO_FORMAT_MP3:
- case AUDIO_FORMAT_AMR_NB:
- case AUDIO_FORMAT_AMR_WB:
- case AUDIO_FORMAT_AAC:
- case AUDIO_FORMAT_HE_AAC_V1:
- case AUDIO_FORMAT_HE_AAC_V2:
- case AUDIO_FORMAT_VORBIS:
- return true;
+ switch (s->get_format(s)) {
+ case AUDIO_FORMAT_PCM_16_BIT:
+ chan_samp_sz = sizeof(int16_t);
+ break;
+ case AUDIO_FORMAT_PCM_8_BIT:
default:
- return false;
+ chan_samp_sz = sizeof(int8_t);
+ break;
}
+
+ return popcount(s->get_channels(s)) * chan_samp_sz;
+}
+
+
+/**********************************************************************/
+
+/**
+ * Every hardware module must have a data structure named HAL_MODULE_INFO_SYM
+ * and the fields of this data structure must begin with hw_module_t
+ * followed by module specific information.
+ */
+struct audio_module {
+ struct hw_module_t common;
+};
+
+struct audio_hw_device {
+ struct hw_device_t common;
+
+ /**
+ * used by audio flinger to enumerate what devices are supported by
+ * each audio_hw_device implementation.
+ *
+ * Return value is a bitmask of 1 or more values of audio_devices_t
+ */
+ uint32_t (*get_supported_devices)(const struct audio_hw_device *dev);
+
+ /**
+ * check to see if the audio hardware interface has been initialized.
+ * returns 0 on success, -ENODEV on failure.
+ */
+ int (*init_check)(const struct audio_hw_device *dev);
+
+ /** set the audio volume of a voice call. Range is between 0.0 and 1.0 */
+ int (*set_voice_volume)(struct audio_hw_device *dev, float volume);
+
+ /**
+ * set the audio volume for all audio activities other than voice call.
+ * Range between 0.0 and 1.0. If any value other than 0 is returned,
+ * the software mixer will emulate this capability.
+ */
+ int (*set_master_volume)(struct audio_hw_device *dev, 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 (*set_mode)(struct audio_hw_device *dev, audio_mode_t mode);
+
+ /* mic mute */
+ int (*set_mic_mute)(struct audio_hw_device *dev, bool state);
+ int (*get_mic_mute)(const struct audio_hw_device *dev, bool *state);
+
+ /* set/get global audio parameters */
+ int (*set_parameters)(struct audio_hw_device *dev, const char *kv_pairs);
+
+ /*
+ * Returns a pointer to a heap allocated string. The caller is responsible
+ * for freeing the memory for it.
+ */
+ char * (*get_parameters)(const struct audio_hw_device *dev,
+ const char *keys);
+
+ /* Returns audio input buffer size according to parameters passed or
+ * 0 if one of the parameters is not supported
+ */
+ size_t (*get_input_buffer_size)(const struct audio_hw_device *dev,
+ uint32_t sample_rate, int format,
+ int channel_count);
+
+ /** This method creates and opens the audio hardware output stream */
+ int (*open_output_stream)(struct audio_hw_device *dev, uint32_t devices,
+ int *format, uint32_t *channels,
+ uint32_t *sample_rate,
+ struct audio_stream_out **out);
+
+ void (*close_output_stream)(struct audio_hw_device *dev,
+ struct audio_stream_out* out);
+
+ /** This method creates and opens the audio hardware input stream */
+ int (*open_input_stream)(struct audio_hw_device *dev, uint32_t devices,
+ int *format, uint32_t *channels,
+ uint32_t *sample_rate,
+ audio_in_acoustics_t acoustics,
+ struct audio_stream_in **stream_in);
+
+ void (*close_input_stream)(struct audio_hw_device *dev,
+ struct audio_stream_in *in);
+
+ /** This method dumps the state of the audio hardware */
+ int (*dump)(const struct audio_hw_device *dev, int fd);
+};
+typedef struct audio_hw_device audio_hw_device_t;
+
+/** convenience API for opening and closing a supported device */
+
+static inline int audio_hw_device_open(const struct hw_module_t* module,
+ struct audio_hw_device** device)
+{
+ return module->methods->open(module, AUDIO_HARDWARE_INTERFACE,
+ (struct hw_device_t**)device);
}
-static inline bool audio_is_linear_pcm(uint32_t format)
+static inline int audio_hw_device_close(struct audio_hw_device* device)
{
- switch (format) {
- case AUDIO_FORMAT_PCM_16_BIT:
- case AUDIO_FORMAT_PCM_8_BIT:
- return true;
- default:
- return false;
- }
+ return device->common.close(&device->common);
}
__END_DECLS
-#endif // ANDROID_AUDIO_CORE_H
+#endif // ANDROID_AUDIO_INTERFACE_H
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