/* $Id: audiodev.h 3664 2011-07-19 03:42:28Z nanang $ */ /* * Copyright (C) 2008-2011 Teluu Inc. (http://www.teluu.com) * Copyright (C) 2003-2008 Benny Prijono * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #ifndef __PJMEDIA_AUDIODEV_AUDIODEV_H__ #define __PJMEDIA_AUDIODEV_AUDIODEV_H__ /** * @file audiodev.h * @brief Audio device API. */ #include #include #include #include #include #include PJ_BEGIN_DECL /** * @defgroup s2_audio_device_reference Audio Device API Reference * @ingroup audio_device_api * @brief API Reference * @{ */ /** * Type for device index. */ typedef pj_int32_t pjmedia_aud_dev_index; /** * Device index constants. */ enum { /** * Constant to denote default capture device */ PJMEDIA_AUD_DEFAULT_CAPTURE_DEV = -1, /** * Constant to denote default playback device */ PJMEDIA_AUD_DEFAULT_PLAYBACK_DEV = -2, /** * Constant to denote invalid device index. */ PJMEDIA_AUD_INVALID_DEV = -3 }; /** * This enumeration identifies various audio device capabilities. These audio * capabilities indicates what features are supported by the underlying * audio device implementation. * * Applications get these capabilities in the #pjmedia_aud_dev_info structure. * * Application can also set the specific features/capabilities when opening * the audio stream by setting the \a flags member of #pjmedia_aud_param * structure. * * Once audio stream is running, application can also retrieve or set some * specific audio capability, by using #pjmedia_aud_stream_get_cap() and * #pjmedia_aud_stream_set_cap() and specifying the desired capability. The * value of the capability is specified as pointer, and application needs to * supply the pointer with the correct value, according to the documentation * of each of the capability. */ typedef enum pjmedia_aud_dev_cap { /** * Support for audio formats other than PCM. The value of this capability * is represented by #pjmedia_format structure. */ PJMEDIA_AUD_DEV_CAP_EXT_FORMAT = 1, /** * Support for audio input latency control or query. The value of this * capability is an unsigned integer containing milliseconds value of * the latency. */ PJMEDIA_AUD_DEV_CAP_INPUT_LATENCY = 2, /** * Support for audio output latency control or query. The value of this * capability is an unsigned integer containing milliseconds value of * the latency. */ PJMEDIA_AUD_DEV_CAP_OUTPUT_LATENCY = 4, /** * Support for setting/retrieving the audio input device volume level. * The value of this capability is an unsigned integer representing * the input audio volume setting in percent. */ PJMEDIA_AUD_DEV_CAP_INPUT_VOLUME_SETTING = 8, /** * Support for setting/retrieving the audio output device volume level. * The value of this capability is an unsigned integer representing * the output audio volume setting in percent. */ PJMEDIA_AUD_DEV_CAP_OUTPUT_VOLUME_SETTING = 16, /** * Support for monitoring the current audio input signal volume. * The value of this capability is an unsigned integer representing * the audio volume in percent. */ PJMEDIA_AUD_DEV_CAP_INPUT_SIGNAL_METER = 32, /** * Support for monitoring the current audio output signal volume. * The value of this capability is an unsigned integer representing * the audio volume in percent. */ PJMEDIA_AUD_DEV_CAP_OUTPUT_SIGNAL_METER = 64, /** * Support for audio input routing. The value of this capability is an * integer containing #pjmedia_aud_dev_route enumeration. */ PJMEDIA_AUD_DEV_CAP_INPUT_ROUTE = 128, /** * Support for audio output routing (e.g. loudspeaker vs earpiece). The * value of this capability is an integer containing #pjmedia_aud_dev_route * enumeration. */ PJMEDIA_AUD_DEV_CAP_OUTPUT_ROUTE = 256, /** * The audio device has echo cancellation feature. The value of this * capability is a pj_bool_t containing boolean PJ_TRUE or PJ_FALSE. */ PJMEDIA_AUD_DEV_CAP_EC = 512, /** * The audio device supports setting echo cancellation fail length. The * value of this capability is an unsigned integer representing the * echo tail in milliseconds. */ PJMEDIA_AUD_DEV_CAP_EC_TAIL = 1024, /** * The audio device has voice activity detection feature. The value * of this capability is a pj_bool_t containing boolean PJ_TRUE or * PJ_FALSE. */ PJMEDIA_AUD_DEV_CAP_VAD = 2048, /** * The audio device has comfort noise generation feature. The value * of this capability is a pj_bool_t containing boolean PJ_TRUE or * PJ_FALSE. */ PJMEDIA_AUD_DEV_CAP_CNG = 4096, /** * The audio device has packet loss concealment feature. The value * of this capability is a pj_bool_t containing boolean PJ_TRUE or * PJ_FALSE. */ PJMEDIA_AUD_DEV_CAP_PLC = 8192, /** * End of capability */ PJMEDIA_AUD_DEV_CAP_MAX = 16384 } pjmedia_aud_dev_cap; /** * This enumeration describes audio routing setting. */ typedef enum pjmedia_aud_dev_route { /** Default route. */ PJMEDIA_AUD_DEV_ROUTE_DEFAULT = 0, /** Route to loudspeaker */ PJMEDIA_AUD_DEV_ROUTE_LOUDSPEAKER = 1, /** Route to earpiece */ PJMEDIA_AUD_DEV_ROUTE_EARPIECE = 2, /** Route to paired Bluetooth device */ PJMEDIA_AUD_DEV_ROUTE_BLUETOOTH = 4 } pjmedia_aud_dev_route; /** * Device information structure returned by #pjmedia_aud_dev_get_info(). */ typedef struct pjmedia_aud_dev_info { /** * The device name */ char name[64]; /** * Maximum number of input channels supported by this device. If the * value is zero, the device does not support input operation (i.e. * it is a playback only device). */ unsigned input_count; /** * Maximum number of output channels supported by this device. If the * value is zero, the device does not support output operation (i.e. * it is an input only device). */ unsigned output_count; /** * Default sampling rate. */ unsigned default_samples_per_sec; /** * The underlying driver name */ char driver[32]; /** * Device capabilities, as bitmask combination of #pjmedia_aud_dev_cap. */ unsigned caps; /** * Supported audio device routes, as bitmask combination of * #pjmedia_aud_dev_route. The value may be zero if the device * does not support audio routing. */ unsigned routes; /** * Number of audio formats supported by this device. The value may be * zero if the device does not support non-PCM format. */ unsigned ext_fmt_cnt; /** * Array of supported extended audio formats */ pjmedia_format ext_fmt[8]; } pjmedia_aud_dev_info; /** * This callback is called by player stream when it needs additional data * to be played by the device. Application must fill in the whole of output * buffer with audio samples. * * The frame argument contains the following values: * - timestamp Playback timestamp, in samples. * - buf Buffer to be filled out by application. * - size The size requested in bytes, which will be equal to * the size of one whole packet. * * @param user_data User data associated with the stream. * @param frame Audio frame, which buffer is to be filled in by * the application. * * @return Returning non-PJ_SUCCESS will cause the audio stream * to stop */ typedef pj_status_t (*pjmedia_aud_play_cb)(void *user_data, pjmedia_frame *frame); /** * This callback is called by recorder stream when it has captured the whole * packet worth of audio samples. * * @param user_data User data associated with the stream. * @param frame Captured frame. * * @return Returning non-PJ_SUCCESS will cause the audio stream * to stop */ typedef pj_status_t (*pjmedia_aud_rec_cb)(void *user_data, pjmedia_frame *frame); /** * This structure specifies the parameters to open the audio stream. */ typedef struct pjmedia_aud_param { /** * The audio direction. This setting is mandatory. */ pjmedia_dir dir; /** * The audio recorder device ID. This setting is mandatory if the audio * direction includes input/capture direction. */ pjmedia_aud_dev_index rec_id; /** * The audio playback device ID. This setting is mandatory if the audio * direction includes output/playback direction. */ pjmedia_aud_dev_index play_id; /** * Clock rate/sampling rate. This setting is mandatory. */ unsigned clock_rate; /** * Number of channels. This setting is mandatory. */ unsigned channel_count; /** * Number of samples per frame. This setting is mandatory. */ unsigned samples_per_frame; /** * Number of bits per sample. This setting is mandatory. */ unsigned bits_per_sample; /** * This flags specifies which of the optional settings are valid in this * structure. The flags is bitmask combination of pjmedia_aud_dev_cap. */ unsigned flags; /** * Set the audio format. This setting is optional, and will only be used * if PJMEDIA_AUD_DEV_CAP_EXT_FORMAT is set in the flags. */ pjmedia_format ext_fmt; /** * Input latency, in milliseconds. This setting is optional, and will * only be used if PJMEDIA_AUD_DEV_CAP_INPUT_LATENCY is set in the flags. */ unsigned input_latency_ms; /** * Input latency, in milliseconds. This setting is optional, and will * only be used if PJMEDIA_AUD_DEV_CAP_OUTPUT_LATENCY is set in the flags. */ unsigned output_latency_ms; /** * Input volume setting, in percent. This setting is optional, and will * only be used if PJMEDIA_AUD_DEV_CAP_INPUT_VOLUME_SETTING is set in * the flags. */ unsigned input_vol; /** * Output volume setting, in percent. This setting is optional, and will * only be used if PJMEDIA_AUD_DEV_CAP_OUTPUT_VOLUME_SETTING is set in * the flags. */ unsigned output_vol; /** * Set the audio input route. This setting is optional, and will only be * used if PJMEDIA_AUD_DEV_CAP_INPUT_ROUTE is set in the flags. */ pjmedia_aud_dev_route input_route; /** * Set the audio output route. This setting is optional, and will only be * used if PJMEDIA_AUD_DEV_CAP_OUTPUT_ROUTE is set in the flags. */ pjmedia_aud_dev_route output_route; /** * Enable/disable echo canceller, if the device supports it. This setting * is optional, and will only be used if PJMEDIA_AUD_DEV_CAP_EC is set in * the flags. */ pj_bool_t ec_enabled; /** * Set echo canceller tail length in milliseconds, if the device supports * it. This setting is optional, and will only be used if * PJMEDIA_AUD_DEV_CAP_EC_TAIL is set in the flags. */ unsigned ec_tail_ms; /** * Enable/disable PLC. This setting is optional, and will only be used * if PJMEDIA_AUD_DEV_CAP_PLC is set in the flags. */ pj_bool_t plc_enabled; /** * Enable/disable CNG. This setting is optional, and will only be used * if PJMEDIA_AUD_DEV_CAP_CNG is set in the flags. */ pj_bool_t cng_enabled; } pjmedia_aud_param; /** Forward declaration for pjmedia_aud_stream */ typedef struct pjmedia_aud_stream pjmedia_aud_stream; /** Forward declaration for audio device factory */ typedef struct pjmedia_aud_dev_factory pjmedia_aud_dev_factory; /* typedef for factory creation function */ typedef pjmedia_aud_dev_factory* (*pjmedia_aud_dev_factory_create_func_ptr)(pj_pool_factory*); /** * Get string info for the specified capability. * * @param cap The capability ID. * @param p_desc Optional pointer which will be filled with longer * description about the capability. * * @return Capability name. */ PJ_DECL(const char*) pjmedia_aud_dev_cap_name(pjmedia_aud_dev_cap cap, const char **p_desc); /** * Set a capability field value in #pjmedia_aud_param structure. This will * also set the flags field for the specified capability in the structure. * * @param param The structure. * @param cap The audio capability which value is to be set. * @param pval Pointer to value. Please see the type of value to * be supplied in the pjmedia_aud_dev_cap documentation. * * @return PJ_SUCCESS on successful operation or the appropriate * error code. */ PJ_DECL(pj_status_t) pjmedia_aud_param_set_cap(pjmedia_aud_param *param, pjmedia_aud_dev_cap cap, const void *pval); /** * Get a capability field value from #pjmedia_aud_param structure. This * function will return PJMEDIA_EAUD_INVCAP error if the flag for that * capability is not set in the flags field in the structure. * * @param param The structure. * @param cap The audio capability which value is to be retrieved. * @param pval Pointer to value. Please see the type of value to * be supplied in the pjmedia_aud_dev_cap documentation. * * @return PJ_SUCCESS on successful operation or the appropriate * error code. */ PJ_DECL(pj_status_t) pjmedia_aud_param_get_cap(const pjmedia_aud_param *param, pjmedia_aud_dev_cap cap, void *pval); /** * Initialize the audio subsystem. This will register all supported audio * device factories to the audio subsystem. This function may be called * more than once, but each call to this function must have the * corresponding #pjmedia_aud_subsys_shutdown() call. * * @param pf The pool factory. * * @return PJ_SUCCESS on successful operation or the appropriate * error code. */ PJ_DECL(pj_status_t) pjmedia_aud_subsys_init(pj_pool_factory *pf); /** * Get the pool factory registered to the audio subsystem. * * @return The pool factory. */ PJ_DECL(pj_pool_factory*) pjmedia_aud_subsys_get_pool_factory(void); /** * Shutdown the audio subsystem. This will destroy all audio device factories * registered in the audio subsystem. Note that currently opened audio streams * may or may not be closed, depending on the implementation of the audio * device factories. * * @return PJ_SUCCESS on successful operation or the appropriate * error code. */ PJ_DECL(pj_status_t) pjmedia_aud_subsys_shutdown(void); /** * Register a supported audio device factory to the audio subsystem. This * function can only be called after calling #pjmedia_aud_subsys_init(). * * @param adf The audio device factory. * * @return PJ_SUCCESS on successful operation or the appropriate * error code. */ PJ_DECL(pj_status_t) pjmedia_aud_register_factory(pjmedia_aud_dev_factory_create_func_ptr adf); /** * Unregister an audio device factory from the audio subsystem. This * function can only be called after calling #pjmedia_aud_subsys_init(). * Devices from this factory will be unlisted. If a device from this factory * is currently in use, then the behavior is undefined. * * @param adf The audio device factory. * * @return PJ_SUCCESS on successful operation or the appropriate * error code. */ PJ_DECL(pj_status_t) pjmedia_aud_unregister_factory(pjmedia_aud_dev_factory_create_func_ptr adf); /** * Refresh the list of sound devices installed in the system. This function * will only refresh the list of audio device so all active audio streams will * be unaffected. After refreshing the device list, application MUST make sure * to update all index references to audio devices (i.e. all variables of type * pjmedia_aud_dev_index) before calling any function that accepts audio device * index as its parameter. * * @return PJ_SUCCESS on successful operation or the appropriate * error code. */ PJ_DECL(pj_status_t) pjmedia_aud_dev_refresh(void); /** * Get the number of sound devices installed in the system. * * @return The number of sound devices installed in the system. */ PJ_DECL(unsigned) pjmedia_aud_dev_count(void); /** * Get device information. * * @param id The audio device ID. * @param info The device information which will be filled in by this * function once it returns successfully. * * @return PJ_SUCCESS on successful operation or the appropriate * error code. */ PJ_DECL(pj_status_t) pjmedia_aud_dev_get_info(pjmedia_aud_dev_index id, pjmedia_aud_dev_info *info); /** * Lookup device index based on the driver and device name. * * @param drv_name The driver name. * @param dev_name The device name. * @param id Pointer to store the returned device ID. * * @return PJ_SUCCESS if the device can be found. */ PJ_DECL(pj_status_t) pjmedia_aud_dev_lookup(const char *drv_name, const char *dev_name, pjmedia_aud_dev_index *id); /** * Initialize the audio device parameters with default values for the * specified device. * * @param id The audio device ID. * @param param The audio device parameters which will be initialized * by this function once it returns successfully. * * @return PJ_SUCCESS on successful operation or the appropriate * error code. */ PJ_DECL(pj_status_t) pjmedia_aud_dev_default_param(pjmedia_aud_dev_index id, pjmedia_aud_param *param); /** * Open audio stream object using the specified parameters. * * @param param Sound device parameters to be used for the stream. * @param rec_cb Callback to be called on every input frame captured. * @param play_cb Callback to be called everytime the sound device needs * audio frames to be played back. * @param user_data Arbitrary user data, which will be given back in the * callbacks. * @param p_strm Pointer to receive the audio stream. * * @return PJ_SUCCESS on successful operation or the appropriate * error code. */ PJ_DECL(pj_status_t) pjmedia_aud_stream_create(const pjmedia_aud_param *param, pjmedia_aud_rec_cb rec_cb, pjmedia_aud_play_cb play_cb, void *user_data, pjmedia_aud_stream **p_strm); /** * Get the running parameters for the specified audio stream. * * @param strm The audio stream. * @param param Audio stream parameters to be filled in by this * function once it returns successfully. * * @return PJ_SUCCESS on successful operation or the appropriate * error code. */ PJ_DECL(pj_status_t) pjmedia_aud_stream_get_param(pjmedia_aud_stream *strm, pjmedia_aud_param *param); /** * Get the value of a specific capability of the audio stream. * * @param strm The audio stream. * @param cap The audio capability which value is to be retrieved. * @param value Pointer to value to be filled in by this function * once it returns successfully. Please see the type * of value to be supplied in the pjmedia_aud_dev_cap * documentation. * * @return PJ_SUCCESS on successful operation or the appropriate * error code. */ PJ_DECL(pj_status_t) pjmedia_aud_stream_get_cap(pjmedia_aud_stream *strm, pjmedia_aud_dev_cap cap, void *value); /** * Set the value of a specific capability of the audio stream. * * @param strm The audio stream. * @param cap The audio capability which value is to be set. * @param value Pointer to value. Please see the type of value to * be supplied in the pjmedia_aud_dev_cap documentation. * * @return PJ_SUCCESS on successful operation or the appropriate * error code. */ PJ_DECL(pj_status_t) pjmedia_aud_stream_set_cap(pjmedia_aud_stream *strm, pjmedia_aud_dev_cap cap, const void *value); /** * Start the stream. * * @param strm The audio stream. * * @return PJ_SUCCESS on successful operation or the appropriate * error code. */ PJ_DECL(pj_status_t) pjmedia_aud_stream_start(pjmedia_aud_stream *strm); /** * Stop the stream. * * @param strm The audio stream. * * @return PJ_SUCCESS on successful operation or the appropriate * error code. */ PJ_DECL(pj_status_t) pjmedia_aud_stream_stop(pjmedia_aud_stream *strm); /** * Destroy the stream. * * @param strm The audio stream. * * @return PJ_SUCCESS on successful operation or the appropriate * error code. */ PJ_DECL(pj_status_t) pjmedia_aud_stream_destroy(pjmedia_aud_stream *strm); /** * @} */ PJ_END_DECL #endif /* __PJMEDIA_AUDIODEV_AUDIODEV_H__ */