зеркало из https://github.com/mozilla/gecko-dev.git
726 строки
30 KiB
C
726 строки
30 KiB
C
/*
|
|
* Copyright © 2011 Mozilla Foundation
|
|
*
|
|
* This program is made available under an ISC-style license. See the
|
|
* accompanying file LICENSE for details.
|
|
*/
|
|
#if !defined(CUBEB_c2f983e9_c96f_e71c_72c3_bbf62992a382)
|
|
#define CUBEB_c2f983e9_c96f_e71c_72c3_bbf62992a382
|
|
|
|
#include "cubeb_export.h"
|
|
#include <stdint.h>
|
|
#include <stdlib.h>
|
|
|
|
#if defined(__cplusplus)
|
|
extern "C" {
|
|
#endif
|
|
|
|
/** @mainpage
|
|
|
|
@section intro Introduction
|
|
|
|
This is the documentation for the <tt>libcubeb</tt> C API.
|
|
<tt>libcubeb</tt> is a callback-based audio API library allowing the
|
|
authoring of portable multiplatform audio playback and recording.
|
|
|
|
@section example Example code
|
|
|
|
This example shows how to create a duplex stream that pipes the microphone
|
|
to the speakers, with minimal latency and the proper sample-rate for the
|
|
platform.
|
|
|
|
@code
|
|
cubeb * app_ctx;
|
|
cubeb_init(&app_ctx, "Example Application", NULL);
|
|
int rv;
|
|
uint32_t rate;
|
|
uint32_t latency_frames;
|
|
uint64_t ts;
|
|
|
|
rv = cubeb_get_preferred_sample_rate(app_ctx, &rate);
|
|
if (rv != CUBEB_OK) {
|
|
fprintf(stderr, "Could not get preferred sample-rate");
|
|
return rv;
|
|
}
|
|
|
|
cubeb_stream_params output_params;
|
|
output_params.format = CUBEB_SAMPLE_FLOAT32NE;
|
|
output_params.rate = rate;
|
|
output_params.channels = 2;
|
|
output_params.layout = CUBEB_LAYOUT_UNDEFINED;
|
|
output_params.prefs = CUBEB_STREAM_PREF_NONE;
|
|
|
|
rv = cubeb_get_min_latency(app_ctx, &output_params, &latency_frames);
|
|
if (rv != CUBEB_OK) {
|
|
fprintf(stderr, "Could not get minimum latency");
|
|
return rv;
|
|
}
|
|
|
|
cubeb_stream_params input_params;
|
|
input_params.format = CUBEB_SAMPLE_FLOAT32NE;
|
|
input_params.rate = rate;
|
|
input_params.channels = 1;
|
|
input_params.layout = CUBEB_LAYOUT_UNDEFINED;
|
|
input_params.prefs = CUBEB_STREAM_PREF_NONE;
|
|
|
|
cubeb_stream * stm;
|
|
rv = cubeb_stream_init(app_ctx, &stm, "Example Stream 1",
|
|
NULL, &input_params,
|
|
NULL, &output_params,
|
|
latency_frames,
|
|
data_cb, state_cb,
|
|
NULL);
|
|
if (rv != CUBEB_OK) {
|
|
fprintf(stderr, "Could not open the stream");
|
|
return rv;
|
|
}
|
|
|
|
rv = cubeb_stream_start(stm);
|
|
if (rv != CUBEB_OK) {
|
|
fprintf(stderr, "Could not start the stream");
|
|
return rv;
|
|
}
|
|
for (;;) {
|
|
cubeb_stream_get_position(stm, &ts);
|
|
printf("time=%llu\n", ts);
|
|
sleep(1);
|
|
}
|
|
rv = cubeb_stream_stop(stm);
|
|
if (rv != CUBEB_OK) {
|
|
fprintf(stderr, "Could not stop the stream");
|
|
return rv;
|
|
}
|
|
|
|
cubeb_stream_destroy(stm);
|
|
cubeb_destroy(app_ctx);
|
|
@endcode
|
|
|
|
@code
|
|
long data_cb(cubeb_stream * stm, void * user,
|
|
const void * input_buffer, void * output_buffer, long nframes)
|
|
{
|
|
const float * in = input_buffer;
|
|
float * out = output_buffer;
|
|
|
|
for (int i = 0; i < nframes; ++i) {
|
|
for (int c = 0; c < 2; ++c) {
|
|
out[2 * i + c] = in[i];
|
|
}
|
|
}
|
|
return nframes;
|
|
}
|
|
@endcode
|
|
|
|
@code
|
|
void state_cb(cubeb_stream * stm, void * user, cubeb_state state)
|
|
{
|
|
printf("state=%d\n", state);
|
|
}
|
|
@endcode
|
|
*/
|
|
|
|
/** @file
|
|
The <tt>libcubeb</tt> C API. */
|
|
|
|
typedef struct cubeb
|
|
cubeb; /**< Opaque handle referencing the application state. */
|
|
typedef struct cubeb_stream
|
|
cubeb_stream; /**< Opaque handle referencing the stream state. */
|
|
|
|
/** Sample format enumeration. */
|
|
typedef enum {
|
|
/**< Little endian 16-bit signed PCM. */
|
|
CUBEB_SAMPLE_S16LE,
|
|
/**< Big endian 16-bit signed PCM. */
|
|
CUBEB_SAMPLE_S16BE,
|
|
/**< Little endian 32-bit IEEE floating point PCM. */
|
|
CUBEB_SAMPLE_FLOAT32LE,
|
|
/**< Big endian 32-bit IEEE floating point PCM. */
|
|
CUBEB_SAMPLE_FLOAT32BE,
|
|
#if defined(WORDS_BIGENDIAN) || defined(__BIG_ENDIAN__)
|
|
/**< Native endian 16-bit signed PCM. */
|
|
CUBEB_SAMPLE_S16NE = CUBEB_SAMPLE_S16BE,
|
|
/**< Native endian 32-bit IEEE floating point PCM. */
|
|
CUBEB_SAMPLE_FLOAT32NE = CUBEB_SAMPLE_FLOAT32BE
|
|
#else
|
|
/**< Native endian 16-bit signed PCM. */
|
|
CUBEB_SAMPLE_S16NE = CUBEB_SAMPLE_S16LE,
|
|
/**< Native endian 32-bit IEEE floating point PCM. */
|
|
CUBEB_SAMPLE_FLOAT32NE = CUBEB_SAMPLE_FLOAT32LE
|
|
#endif
|
|
} cubeb_sample_format;
|
|
|
|
/** An opaque handle used to refer a particular input or output device
|
|
* across calls. */
|
|
typedef void const * cubeb_devid;
|
|
|
|
/** Level (verbosity) of logging for a particular cubeb context. */
|
|
typedef enum {
|
|
CUBEB_LOG_DISABLED = 0, /** < Logging disabled */
|
|
CUBEB_LOG_NORMAL =
|
|
1, /**< Logging lifetime operation (creation/destruction). */
|
|
CUBEB_LOG_VERBOSE = 2, /**< Verbose logging of callbacks, can have performance
|
|
implications. */
|
|
} cubeb_log_level;
|
|
|
|
typedef enum {
|
|
CHANNEL_UNKNOWN = 0,
|
|
CHANNEL_FRONT_LEFT = 1 << 0,
|
|
CHANNEL_FRONT_RIGHT = 1 << 1,
|
|
CHANNEL_FRONT_CENTER = 1 << 2,
|
|
CHANNEL_LOW_FREQUENCY = 1 << 3,
|
|
CHANNEL_BACK_LEFT = 1 << 4,
|
|
CHANNEL_BACK_RIGHT = 1 << 5,
|
|
CHANNEL_FRONT_LEFT_OF_CENTER = 1 << 6,
|
|
CHANNEL_FRONT_RIGHT_OF_CENTER = 1 << 7,
|
|
CHANNEL_BACK_CENTER = 1 << 8,
|
|
CHANNEL_SIDE_LEFT = 1 << 9,
|
|
CHANNEL_SIDE_RIGHT = 1 << 10,
|
|
CHANNEL_TOP_CENTER = 1 << 11,
|
|
CHANNEL_TOP_FRONT_LEFT = 1 << 12,
|
|
CHANNEL_TOP_FRONT_CENTER = 1 << 13,
|
|
CHANNEL_TOP_FRONT_RIGHT = 1 << 14,
|
|
CHANNEL_TOP_BACK_LEFT = 1 << 15,
|
|
CHANNEL_TOP_BACK_CENTER = 1 << 16,
|
|
CHANNEL_TOP_BACK_RIGHT = 1 << 17
|
|
} cubeb_channel;
|
|
|
|
typedef uint32_t cubeb_channel_layout;
|
|
// Some common layout definitions.
|
|
enum {
|
|
CUBEB_LAYOUT_UNDEFINED = 0, // Indicate the speaker's layout is undefined.
|
|
CUBEB_LAYOUT_MONO = CHANNEL_FRONT_CENTER,
|
|
CUBEB_LAYOUT_MONO_LFE = CUBEB_LAYOUT_MONO | CHANNEL_LOW_FREQUENCY,
|
|
CUBEB_LAYOUT_STEREO = CHANNEL_FRONT_LEFT | CHANNEL_FRONT_RIGHT,
|
|
CUBEB_LAYOUT_STEREO_LFE = CUBEB_LAYOUT_STEREO | CHANNEL_LOW_FREQUENCY,
|
|
CUBEB_LAYOUT_3F =
|
|
CHANNEL_FRONT_LEFT | CHANNEL_FRONT_RIGHT | CHANNEL_FRONT_CENTER,
|
|
CUBEB_LAYOUT_3F_LFE = CUBEB_LAYOUT_3F | CHANNEL_LOW_FREQUENCY,
|
|
CUBEB_LAYOUT_2F1 =
|
|
CHANNEL_FRONT_LEFT | CHANNEL_FRONT_RIGHT | CHANNEL_BACK_CENTER,
|
|
CUBEB_LAYOUT_2F1_LFE = CUBEB_LAYOUT_2F1 | CHANNEL_LOW_FREQUENCY,
|
|
CUBEB_LAYOUT_3F1 = CHANNEL_FRONT_LEFT | CHANNEL_FRONT_RIGHT |
|
|
CHANNEL_FRONT_CENTER | CHANNEL_BACK_CENTER,
|
|
CUBEB_LAYOUT_3F1_LFE = CUBEB_LAYOUT_3F1 | CHANNEL_LOW_FREQUENCY,
|
|
CUBEB_LAYOUT_2F2 = CHANNEL_FRONT_LEFT | CHANNEL_FRONT_RIGHT |
|
|
CHANNEL_SIDE_LEFT | CHANNEL_SIDE_RIGHT,
|
|
CUBEB_LAYOUT_2F2_LFE = CUBEB_LAYOUT_2F2 | CHANNEL_LOW_FREQUENCY,
|
|
CUBEB_LAYOUT_QUAD = CHANNEL_FRONT_LEFT | CHANNEL_FRONT_RIGHT |
|
|
CHANNEL_BACK_LEFT | CHANNEL_BACK_RIGHT,
|
|
CUBEB_LAYOUT_QUAD_LFE = CUBEB_LAYOUT_QUAD | CHANNEL_LOW_FREQUENCY,
|
|
CUBEB_LAYOUT_3F2 = CHANNEL_FRONT_LEFT | CHANNEL_FRONT_RIGHT |
|
|
CHANNEL_FRONT_CENTER | CHANNEL_SIDE_LEFT |
|
|
CHANNEL_SIDE_RIGHT,
|
|
CUBEB_LAYOUT_3F2_LFE = CUBEB_LAYOUT_3F2 | CHANNEL_LOW_FREQUENCY,
|
|
CUBEB_LAYOUT_3F2_BACK = CUBEB_LAYOUT_QUAD | CHANNEL_FRONT_CENTER,
|
|
CUBEB_LAYOUT_3F2_LFE_BACK = CUBEB_LAYOUT_3F2_BACK | CHANNEL_LOW_FREQUENCY,
|
|
CUBEB_LAYOUT_3F3R_LFE = CHANNEL_FRONT_LEFT | CHANNEL_FRONT_RIGHT |
|
|
CHANNEL_FRONT_CENTER | CHANNEL_LOW_FREQUENCY |
|
|
CHANNEL_BACK_CENTER | CHANNEL_SIDE_LEFT |
|
|
CHANNEL_SIDE_RIGHT,
|
|
CUBEB_LAYOUT_3F4_LFE = CHANNEL_FRONT_LEFT | CHANNEL_FRONT_RIGHT |
|
|
CHANNEL_FRONT_CENTER | CHANNEL_LOW_FREQUENCY |
|
|
CHANNEL_BACK_LEFT | CHANNEL_BACK_RIGHT |
|
|
CHANNEL_SIDE_LEFT | CHANNEL_SIDE_RIGHT,
|
|
};
|
|
|
|
/** Miscellaneous stream preferences. */
|
|
typedef enum {
|
|
CUBEB_STREAM_PREF_NONE = 0x00, /**< No stream preferences are requested. */
|
|
CUBEB_STREAM_PREF_LOOPBACK =
|
|
0x01, /**< Request a loopback stream. Should be
|
|
specified on the input params and an
|
|
output device to loopback from should
|
|
be passed in place of an input device. */
|
|
CUBEB_STREAM_PREF_DISABLE_DEVICE_SWITCHING = 0x02, /**< Disable switching
|
|
default device on OS
|
|
changes. */
|
|
CUBEB_STREAM_PREF_VOICE =
|
|
0x04, /**< This stream is going to transport voice data.
|
|
Depending on the backend and platform, this can
|
|
change the audio input or output devices
|
|
selected, as well as the quality of the stream,
|
|
for example to accomodate bluetooth SCO modes on
|
|
bluetooth devices. */
|
|
CUBEB_STREAM_PREF_RAW =
|
|
0x08, /**< Windows only. Bypass all signal processing
|
|
except for always on APO, driver and hardware. */
|
|
CUBEB_STREAM_PREF_PERSIST = 0x10, /**< Request that the volume and mute
|
|
settings should persist across restarts
|
|
of the stream and/or application. This is
|
|
obsolete and ignored by all backends. */
|
|
CUBEB_STREAM_PREF_JACK_NO_AUTO_CONNECT = 0x20 /**< Don't automatically try to
|
|
connect ports. Only affects
|
|
the jack backend. */
|
|
} cubeb_stream_prefs;
|
|
|
|
/** Stream format initialization parameters. */
|
|
typedef struct {
|
|
cubeb_sample_format format; /**< Requested sample format. One of
|
|
#cubeb_sample_format. */
|
|
uint32_t rate; /**< Requested sample rate. Valid range is [1000, 192000]. */
|
|
uint32_t channels; /**< Requested channel count. Valid range is [1, 8]. */
|
|
cubeb_channel_layout
|
|
layout; /**< Requested channel layout. This must be consistent with the
|
|
provided channels. CUBEB_LAYOUT_UNDEFINED if unknown */
|
|
cubeb_stream_prefs prefs; /**< Requested preferences. */
|
|
} cubeb_stream_params;
|
|
|
|
/** Audio device description */
|
|
typedef struct {
|
|
char * output_name; /**< The name of the output device */
|
|
char * input_name; /**< The name of the input device */
|
|
} cubeb_device;
|
|
|
|
/** Stream states signaled via state_callback. */
|
|
typedef enum {
|
|
CUBEB_STATE_STARTED, /**< Stream started. */
|
|
CUBEB_STATE_STOPPED, /**< Stream stopped. */
|
|
CUBEB_STATE_DRAINED, /**< Stream drained. */
|
|
CUBEB_STATE_ERROR /**< Stream disabled due to error. */
|
|
} cubeb_state;
|
|
|
|
/** Result code enumeration. */
|
|
enum {
|
|
CUBEB_OK = 0, /**< Success. */
|
|
CUBEB_ERROR = -1, /**< Unclassified error. */
|
|
CUBEB_ERROR_INVALID_FORMAT =
|
|
-2, /**< Unsupported #cubeb_stream_params requested. */
|
|
CUBEB_ERROR_INVALID_PARAMETER = -3, /**< Invalid parameter specified. */
|
|
CUBEB_ERROR_NOT_SUPPORTED =
|
|
-4, /**< Optional function not implemented in current backend. */
|
|
CUBEB_ERROR_DEVICE_UNAVAILABLE =
|
|
-5 /**< Device specified by #cubeb_devid not available. */
|
|
};
|
|
|
|
/**
|
|
* Whether a particular device is an input device (e.g. a microphone), or an
|
|
* output device (e.g. headphones). */
|
|
typedef enum {
|
|
CUBEB_DEVICE_TYPE_UNKNOWN,
|
|
CUBEB_DEVICE_TYPE_INPUT,
|
|
CUBEB_DEVICE_TYPE_OUTPUT
|
|
} cubeb_device_type;
|
|
|
|
/**
|
|
* The state of a device.
|
|
*/
|
|
typedef enum {
|
|
CUBEB_DEVICE_STATE_DISABLED, /**< The device has been disabled at the system
|
|
level. */
|
|
CUBEB_DEVICE_STATE_UNPLUGGED, /**< The device is enabled, but nothing is
|
|
plugged into it. */
|
|
CUBEB_DEVICE_STATE_ENABLED /**< The device is enabled. */
|
|
} cubeb_device_state;
|
|
|
|
/**
|
|
* Architecture specific sample type.
|
|
*/
|
|
typedef enum {
|
|
CUBEB_DEVICE_FMT_S16LE = 0x0010, /**< 16-bit integers, Little Endian. */
|
|
CUBEB_DEVICE_FMT_S16BE = 0x0020, /**< 16-bit integers, Big Endian. */
|
|
CUBEB_DEVICE_FMT_F32LE = 0x1000, /**< 32-bit floating point, Little Endian. */
|
|
CUBEB_DEVICE_FMT_F32BE = 0x2000 /**< 32-bit floating point, Big Endian. */
|
|
} cubeb_device_fmt;
|
|
|
|
#if defined(WORDS_BIGENDIAN) || defined(__BIG_ENDIAN__)
|
|
/** 16-bit integers, native endianess, when on a Big Endian environment. */
|
|
#define CUBEB_DEVICE_FMT_S16NE CUBEB_DEVICE_FMT_S16BE
|
|
/** 32-bit floating points, native endianess, when on a Big Endian environment.
|
|
*/
|
|
#define CUBEB_DEVICE_FMT_F32NE CUBEB_DEVICE_FMT_F32BE
|
|
#else
|
|
/** 16-bit integers, native endianess, when on a Little Endian environment. */
|
|
#define CUBEB_DEVICE_FMT_S16NE CUBEB_DEVICE_FMT_S16LE
|
|
/** 32-bit floating points, native endianess, when on a Little Endian
|
|
* environment. */
|
|
#define CUBEB_DEVICE_FMT_F32NE CUBEB_DEVICE_FMT_F32LE
|
|
#endif
|
|
/** All the 16-bit integers types. */
|
|
#define CUBEB_DEVICE_FMT_S16_MASK \
|
|
(CUBEB_DEVICE_FMT_S16LE | CUBEB_DEVICE_FMT_S16BE)
|
|
/** All the 32-bit floating points types. */
|
|
#define CUBEB_DEVICE_FMT_F32_MASK \
|
|
(CUBEB_DEVICE_FMT_F32LE | CUBEB_DEVICE_FMT_F32BE)
|
|
/** All the device formats types. */
|
|
#define CUBEB_DEVICE_FMT_ALL \
|
|
(CUBEB_DEVICE_FMT_S16_MASK | CUBEB_DEVICE_FMT_F32_MASK)
|
|
|
|
/** Channel type for a `cubeb_stream`. Depending on the backend and platform
|
|
* used, this can control inter-stream interruption, ducking, and volume
|
|
* control.
|
|
*/
|
|
typedef enum {
|
|
CUBEB_DEVICE_PREF_NONE = 0x00,
|
|
CUBEB_DEVICE_PREF_MULTIMEDIA = 0x01,
|
|
CUBEB_DEVICE_PREF_VOICE = 0x02,
|
|
CUBEB_DEVICE_PREF_NOTIFICATION = 0x04,
|
|
CUBEB_DEVICE_PREF_ALL = 0x0F
|
|
} cubeb_device_pref;
|
|
|
|
/** This structure holds the characteristics
|
|
* of an input or output audio device. It is obtained using
|
|
* `cubeb_enumerate_devices`, which returns these structures via
|
|
* `cubeb_device_collection` and must be destroyed via
|
|
* `cubeb_device_collection_destroy`. */
|
|
typedef struct {
|
|
cubeb_devid devid; /**< Device identifier handle. */
|
|
char const *
|
|
device_id; /**< Device identifier which might be presented in a UI. */
|
|
char const * friendly_name; /**< Friendly device name which might be presented
|
|
in a UI. */
|
|
char const * group_id; /**< Two devices have the same group identifier if they
|
|
belong to the same physical device; for example a
|
|
headset and microphone. */
|
|
char const * vendor_name; /**< Optional vendor name, may be NULL. */
|
|
|
|
cubeb_device_type type; /**< Type of device (Input/Output). */
|
|
cubeb_device_state state; /**< State of device disabled/enabled/unplugged. */
|
|
cubeb_device_pref preferred; /**< Preferred device. */
|
|
|
|
cubeb_device_fmt format; /**< Sample format supported. */
|
|
cubeb_device_fmt
|
|
default_format; /**< The default sample format for this device. */
|
|
uint32_t max_channels; /**< Channels. */
|
|
uint32_t default_rate; /**< Default/Preferred sample rate. */
|
|
uint32_t max_rate; /**< Maximum sample rate supported. */
|
|
uint32_t min_rate; /**< Minimum sample rate supported. */
|
|
|
|
uint32_t latency_lo; /**< Lowest possible latency in frames. */
|
|
uint32_t latency_hi; /**< Higest possible latency in frames. */
|
|
} cubeb_device_info;
|
|
|
|
/** Device collection.
|
|
* Returned by `cubeb_enumerate_devices` and destroyed by
|
|
* `cubeb_device_collection_destroy`. */
|
|
typedef struct {
|
|
cubeb_device_info * device; /**< Array of pointers to device info. */
|
|
size_t count; /**< Device count in collection. */
|
|
} cubeb_device_collection;
|
|
|
|
/** User supplied data callback.
|
|
- Calling other cubeb functions from this callback is unsafe.
|
|
- The code in the callback should be non-blocking.
|
|
- Returning less than the number of frames this callback asks for or
|
|
provides puts the stream in drain mode. This callback will not be called
|
|
again, and the state callback will be called with CUBEB_STATE_DRAINED when
|
|
all the frames have been output.
|
|
@param stream The stream for which this callback fired.
|
|
@param user_ptr The pointer passed to cubeb_stream_init.
|
|
@param input_buffer A pointer containing the input data, or nullptr
|
|
if this is an output-only stream.
|
|
@param output_buffer A pointer to a buffer to be filled with audio samples,
|
|
or nullptr if this is an input-only stream.
|
|
@param nframes The number of frames of the two buffer.
|
|
@retval If the stream has output, this is the number of frames written to
|
|
the output buffer. In this case, if this number is less than
|
|
nframes then the stream will start to drain. If the stream is
|
|
input only, then returning nframes indicates data has been read.
|
|
In this case, a value less than nframes will result in the stream
|
|
being stopped.
|
|
@retval CUBEB_ERROR on error, in which case the data callback will stop
|
|
and the stream will enter a shutdown state. */
|
|
typedef long (*cubeb_data_callback)(cubeb_stream * stream, void * user_ptr,
|
|
void const * input_buffer,
|
|
void * output_buffer, long nframes);
|
|
|
|
/** User supplied state callback.
|
|
@param stream The stream for this this callback fired.
|
|
@param user_ptr The pointer passed to cubeb_stream_init.
|
|
@param state The new state of the stream. */
|
|
typedef void (*cubeb_state_callback)(cubeb_stream * stream, void * user_ptr,
|
|
cubeb_state state);
|
|
|
|
/**
|
|
* User supplied callback called when the underlying device changed.
|
|
* @param user The pointer passed to cubeb_stream_init. */
|
|
typedef void (*cubeb_device_changed_callback)(void * user_ptr);
|
|
|
|
/**
|
|
* User supplied callback called when the underlying device collection changed.
|
|
* @param context A pointer to the cubeb context.
|
|
* @param user_ptr The pointer passed to
|
|
* cubeb_register_device_collection_changed. */
|
|
typedef void (*cubeb_device_collection_changed_callback)(cubeb * context,
|
|
void * user_ptr);
|
|
|
|
/** User supplied callback called when a message needs logging. */
|
|
typedef void (*cubeb_log_callback)(char const * fmt, ...);
|
|
|
|
/** Initialize an application context. This will perform any library or
|
|
application scoped initialization.
|
|
|
|
Note: On Windows platforms, COM must be initialized in MTA mode on
|
|
any thread that will call the cubeb API.
|
|
|
|
@param context A out param where an opaque pointer to the application
|
|
context will be returned.
|
|
@param context_name A name for the context. Depending on the platform this
|
|
can appear in different locations.
|
|
@param backend_name The name of the cubeb backend user desires to select.
|
|
Accepted values self-documented in cubeb.c: init_oneshot
|
|
If NULL, a default ordering is used for backend choice.
|
|
A valid choice overrides all other possible backends,
|
|
so long as the backend was included at compile time.
|
|
@retval CUBEB_OK in case of success.
|
|
@retval CUBEB_ERROR in case of error, for example because the host
|
|
has no audio hardware. */
|
|
CUBEB_EXPORT int
|
|
cubeb_init(cubeb ** context, char const * context_name,
|
|
char const * backend_name);
|
|
|
|
/** Get a read-only string identifying this context's current backend.
|
|
@param context A pointer to the cubeb context.
|
|
@retval Read-only string identifying current backend. */
|
|
CUBEB_EXPORT char const *
|
|
cubeb_get_backend_id(cubeb * context);
|
|
|
|
/** Get the maximum possible number of channels.
|
|
@param context A pointer to the cubeb context.
|
|
@param max_channels The maximum number of channels.
|
|
@retval CUBEB_OK
|
|
@retval CUBEB_ERROR_INVALID_PARAMETER
|
|
@retval CUBEB_ERROR_NOT_SUPPORTED
|
|
@retval CUBEB_ERROR */
|
|
CUBEB_EXPORT int
|
|
cubeb_get_max_channel_count(cubeb * context, uint32_t * max_channels);
|
|
|
|
/** Get the minimal latency value, in frames, that is guaranteed to work
|
|
when creating a stream for the specified sample rate. This is platform,
|
|
hardware and backend dependent.
|
|
@param context A pointer to the cubeb context.
|
|
@param params On some backends, the minimum achievable latency depends on
|
|
the characteristics of the stream.
|
|
@param latency_frames The latency value, in frames, to pass to
|
|
cubeb_stream_init.
|
|
@retval CUBEB_OK
|
|
@retval CUBEB_ERROR_INVALID_PARAMETER
|
|
@retval CUBEB_ERROR_NOT_SUPPORTED */
|
|
CUBEB_EXPORT int
|
|
cubeb_get_min_latency(cubeb * context, cubeb_stream_params * params,
|
|
uint32_t * latency_frames);
|
|
|
|
/** Get the preferred sample rate for this backend: this is hardware and
|
|
platform dependent, and can avoid resampling, and/or trigger fastpaths.
|
|
@param context A pointer to the cubeb context.
|
|
@param rate The samplerate (in Hz) the current configuration prefers.
|
|
@retval CUBEB_OK
|
|
@retval CUBEB_ERROR_INVALID_PARAMETER
|
|
@retval CUBEB_ERROR_NOT_SUPPORTED */
|
|
CUBEB_EXPORT int
|
|
cubeb_get_preferred_sample_rate(cubeb * context, uint32_t * rate);
|
|
|
|
/** Destroy an application context. This must be called after all stream have
|
|
* been destroyed.
|
|
@param context A pointer to the cubeb context.*/
|
|
CUBEB_EXPORT void
|
|
cubeb_destroy(cubeb * context);
|
|
|
|
/** Initialize a stream associated with the supplied application context.
|
|
@param context A pointer to the cubeb context.
|
|
@param stream An out parameter to be filled with the an opaque pointer to a
|
|
cubeb stream.
|
|
@param stream_name A name for this stream.
|
|
@param input_device Device for the input side of the stream. If NULL the
|
|
default input device is used. Passing a valid
|
|
cubeb_devid means the stream only ever uses that device. Passing a NULL
|
|
cubeb_devid allows the stream to follow that device
|
|
type's OS default.
|
|
@param input_stream_params Parameters for the input side of the stream, or
|
|
NULL if this stream is output only.
|
|
@param output_device Device for the output side of the stream. If NULL the
|
|
default output device is used. Passing a valid
|
|
cubeb_devid means the stream only ever uses that device. Passing a NULL
|
|
cubeb_devid allows the stream to follow that device
|
|
type's OS default.
|
|
@param output_stream_params Parameters for the output side of the stream, or
|
|
NULL if this stream is input only. When input
|
|
and output stream parameters are supplied, their
|
|
rate has to be the same.
|
|
@param latency_frames Stream latency in frames. Valid range
|
|
is [1, 96000].
|
|
@param data_callback Will be called to preroll data before playback is
|
|
started by cubeb_stream_start.
|
|
@param state_callback A pointer to a state callback.
|
|
@param user_ptr A pointer that will be passed to the callbacks. This pointer
|
|
must outlive the life time of the stream.
|
|
@retval CUBEB_OK
|
|
@retval CUBEB_ERROR
|
|
@retval CUBEB_ERROR_INVALID_FORMAT
|
|
@retval CUBEB_ERROR_DEVICE_UNAVAILABLE */
|
|
CUBEB_EXPORT int
|
|
cubeb_stream_init(cubeb * context, cubeb_stream ** stream,
|
|
char const * stream_name, cubeb_devid input_device,
|
|
cubeb_stream_params * input_stream_params,
|
|
cubeb_devid output_device,
|
|
cubeb_stream_params * output_stream_params,
|
|
uint32_t latency_frames, cubeb_data_callback data_callback,
|
|
cubeb_state_callback state_callback, void * user_ptr);
|
|
|
|
/** Destroy a stream. `cubeb_stream_stop` MUST be called before destroying a
|
|
stream.
|
|
@param stream The stream to destroy. */
|
|
CUBEB_EXPORT void
|
|
cubeb_stream_destroy(cubeb_stream * stream);
|
|
|
|
/** Start playback.
|
|
@param stream
|
|
@retval CUBEB_OK
|
|
@retval CUBEB_ERROR */
|
|
CUBEB_EXPORT int
|
|
cubeb_stream_start(cubeb_stream * stream);
|
|
|
|
/** Stop playback.
|
|
@param stream
|
|
@retval CUBEB_OK
|
|
@retval CUBEB_ERROR */
|
|
CUBEB_EXPORT int
|
|
cubeb_stream_stop(cubeb_stream * stream);
|
|
|
|
/** Get the current stream playback position.
|
|
@param stream
|
|
@param position Playback position in frames.
|
|
@retval CUBEB_OK
|
|
@retval CUBEB_ERROR */
|
|
CUBEB_EXPORT int
|
|
cubeb_stream_get_position(cubeb_stream * stream, uint64_t * position);
|
|
|
|
/** Get the latency for this stream, in frames. This is the number of frames
|
|
between the time cubeb acquires the data in the callback and the listener
|
|
can hear the sound.
|
|
@param stream
|
|
@param latency Current approximate stream latency in frames.
|
|
@retval CUBEB_OK
|
|
@retval CUBEB_ERROR_NOT_SUPPORTED
|
|
@retval CUBEB_ERROR */
|
|
CUBEB_EXPORT int
|
|
cubeb_stream_get_latency(cubeb_stream * stream, uint32_t * latency);
|
|
|
|
/** Get the input latency for this stream, in frames. This is the number of
|
|
frames between the time the audio input devices records the data, and they
|
|
are available in the data callback.
|
|
This returns CUBEB_ERROR when the stream is output-only.
|
|
@param stream
|
|
@param latency Current approximate stream latency in frames.
|
|
@retval CUBEB_OK
|
|
@retval CUBEB_ERROR_NOT_SUPPORTED
|
|
@retval CUBEB_ERROR */
|
|
CUBEB_EXPORT int
|
|
cubeb_stream_get_input_latency(cubeb_stream * stream, uint32_t * latency);
|
|
/** Set the volume for a stream.
|
|
@param stream the stream for which to adjust the volume.
|
|
@param volume a float between 0.0 (muted) and 1.0 (maximum volume)
|
|
@retval CUBEB_OK
|
|
@retval CUBEB_ERROR_INVALID_PARAMETER volume is outside [0.0, 1.0] or
|
|
stream is an invalid pointer
|
|
@retval CUBEB_ERROR_NOT_SUPPORTED */
|
|
CUBEB_EXPORT int
|
|
cubeb_stream_set_volume(cubeb_stream * stream, float volume);
|
|
|
|
/** Change a stream's name.
|
|
@param stream the stream for which to set the name.
|
|
@param stream_name the new name for the stream
|
|
@retval CUBEB_OK
|
|
@retval CUBEB_ERROR_INVALID_PARAMETER if any pointer is invalid
|
|
@retval CUBEB_ERROR_NOT_SUPPORTED */
|
|
CUBEB_EXPORT int
|
|
cubeb_stream_set_name(cubeb_stream * stream, char const * stream_name);
|
|
|
|
/** Get the current output device for this stream.
|
|
@param stm the stream for which to query the current output device
|
|
@param device a pointer in which the current output device will be stored.
|
|
@retval CUBEB_OK in case of success
|
|
@retval CUBEB_ERROR_INVALID_PARAMETER if either stm, device or count are
|
|
invalid pointers
|
|
@retval CUBEB_ERROR_NOT_SUPPORTED */
|
|
CUBEB_EXPORT int
|
|
cubeb_stream_get_current_device(cubeb_stream * stm,
|
|
cubeb_device ** const device);
|
|
|
|
/** Destroy a cubeb_device structure.
|
|
@param stream the stream passed in cubeb_stream_get_current_device
|
|
@param devices the devices to destroy
|
|
@retval CUBEB_OK in case of success
|
|
@retval CUBEB_ERROR_INVALID_PARAMETER if devices is an invalid pointer
|
|
@retval CUBEB_ERROR_NOT_SUPPORTED */
|
|
CUBEB_EXPORT int
|
|
cubeb_stream_device_destroy(cubeb_stream * stream, cubeb_device * devices);
|
|
|
|
/** Set a callback to be notified when the output device changes.
|
|
@param stream the stream for which to set the callback.
|
|
@param device_changed_callback a function called whenever the device has
|
|
changed. Passing NULL allow to unregister a function
|
|
@retval CUBEB_OK
|
|
@retval CUBEB_ERROR_INVALID_PARAMETER if either stream or
|
|
device_changed_callback are invalid pointers.
|
|
@retval CUBEB_ERROR_NOT_SUPPORTED */
|
|
CUBEB_EXPORT int
|
|
cubeb_stream_register_device_changed_callback(
|
|
cubeb_stream * stream,
|
|
cubeb_device_changed_callback device_changed_callback);
|
|
|
|
/** Return the user data pointer registered with the stream with
|
|
cubeb_stream_init.
|
|
@param stream the stream for which to retrieve user data pointer.
|
|
@retval user data pointer */
|
|
CUBEB_EXPORT void *
|
|
cubeb_stream_user_ptr(cubeb_stream * stream);
|
|
|
|
/** Returns enumerated devices.
|
|
@param context
|
|
@param devtype device type to include
|
|
@param collection output collection. Must be destroyed with
|
|
cubeb_device_collection_destroy
|
|
@retval CUBEB_OK in case of success
|
|
@retval CUBEB_ERROR_INVALID_PARAMETER if collection is an invalid pointer
|
|
@retval CUBEB_ERROR_NOT_SUPPORTED */
|
|
CUBEB_EXPORT int
|
|
cubeb_enumerate_devices(cubeb * context, cubeb_device_type devtype,
|
|
cubeb_device_collection * collection);
|
|
|
|
/** Destroy a cubeb_device_collection, and its `cubeb_device_info`.
|
|
@param context
|
|
@param collection collection to destroy
|
|
@retval CUBEB_OK
|
|
@retval CUBEB_ERROR_INVALID_PARAMETER if collection is an invalid pointer */
|
|
CUBEB_EXPORT int
|
|
cubeb_device_collection_destroy(cubeb * context,
|
|
cubeb_device_collection * collection);
|
|
|
|
/** Registers a callback which is called when the system detects
|
|
a new device or a device is removed.
|
|
@param context
|
|
@param devtype device type to include. Different callbacks and user pointers
|
|
can be registered for each devtype. The hybrid devtype
|
|
`CUBEB_DEVICE_TYPE_INPUT | CUBEB_DEVICE_TYPE_OUTPUT` is also valid
|
|
and will register the provided callback and user pointer in both
|
|
sides.
|
|
@param callback a function called whenever the system device list changes.
|
|
Passing NULL allow to unregister a function. You have to unregister
|
|
first before you register a new callback.
|
|
@param user_ptr pointer to user specified data which will be present in
|
|
subsequent callbacks.
|
|
@retval CUBEB_ERROR_NOT_SUPPORTED */
|
|
CUBEB_EXPORT int
|
|
cubeb_register_device_collection_changed(
|
|
cubeb * context, cubeb_device_type devtype,
|
|
cubeb_device_collection_changed_callback callback, void * user_ptr);
|
|
|
|
/** Set a callback to be called with a message.
|
|
@param log_level CUBEB_LOG_VERBOSE, CUBEB_LOG_NORMAL.
|
|
@param log_callback A function called with a message when there is
|
|
something to log. Pass NULL to unregister.
|
|
@retval CUBEB_OK in case of success.
|
|
@retval CUBEB_ERROR_INVALID_PARAMETER if either context or log_callback are
|
|
invalid pointers, or if level is not
|
|
in cubeb_log_level. */
|
|
CUBEB_EXPORT int
|
|
cubeb_set_log_callback(cubeb_log_level log_level,
|
|
cubeb_log_callback log_callback);
|
|
|
|
#if defined(__cplusplus)
|
|
}
|
|
#endif
|
|
|
|
#endif /* CUBEB_c2f983e9_c96f_e71c_72c3_bbf62992a382 */
|