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https://github.com/Rockbox/rockbox.git
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163 lines
3.8 KiB
C
163 lines
3.8 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id: $
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*
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* Copyright (C) 2014 by Amaury Pouly
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*
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* All files in this archive are subject to the GNU General Public License.
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* See the file COPYING in the source tree root for full license agreement.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#ifndef USB_AUDIO_H
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#define USB_AUDIO_H
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#include "usb_ch9.h"
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#include "usb_class_driver.h"
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/* NOTE
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*
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* This is USBAudio 1.0. USBAudio 2.0 is notably _not backwards compatible!_
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* USBAudio 1.0 over _USB_ 2.0 is perfectly valid!
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*
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* Relevant specifications are USB 2.0 and USB Audio Class 1.0.
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*/
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/*
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* usb_audio_get_playing():
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*
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* Returns playing/not playing status of usbaudio.
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*/
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bool usb_audio_get_playing(void);
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/*
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* usb_audio_get_alloc_failed():
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*
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* Return whether the buffer allocation succeeded (0)
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* or failed (1).
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*/
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bool usb_audio_get_alloc_failed(void);
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/*
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* usb_audio_get_playback_sampling_frequency():
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*
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* Return the sample rate currently set.
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*/
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unsigned long usb_audio_get_playback_sampling_frequency(void);
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/*
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* usb_audio_get_main_intf():
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*
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* Return the main usb interface
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*/
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int usb_audio_get_main_intf(void);
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/*
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* usb_audio_get_alt_intf():
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*
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* Return the alternate usb interface
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*/
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int usb_audio_get_alt_intf(void);
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/*
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* usb_audio_get_samplesperframe():
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*
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* Return the samples per frame over the last two feedback cycles
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* This is the samples sent to the mixer.
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*
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* This is returned in floating point 16.16 type. To convert to float,
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* do ((double)result / (1<<16))
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*/
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int32_t usb_audio_get_samplesperframe(void);
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/*
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* usb_audio_get_samplesperframe():
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*
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* Return the samples per frame over the last two feedback cycles
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* This is the samples received from USB.
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*
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* This is returned in floating point 16.16 type. To convert to float,
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* do ((double)result / (1<<16))
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*/
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int32_t usb_audio_get_samples_rx_perframe(void);
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/*
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* usb_audio_get_out_ep():
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*
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* Return the out (to device) endpoint
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*/
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unsigned int usb_audio_get_out_ep(void);
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/*
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* usb_audio_get_in_ep():
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*
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* Return the in (to host) endpoint
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*/
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unsigned int usb_audio_get_in_ep(void);
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/*
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* usb_audio_get_prebuffering():
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*
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* Return number of buffers filled ahead of playback
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*/
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int usb_audio_get_prebuffering(void);
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/*
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* usb_audio_get_prebuffering_avg():
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*
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* Return the average number of buffers filled ahead of playback
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* over the last two feedback cycles
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*
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* This is returned in floating point 16.16 type. To convert to float,
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* do ((double)result / (1<<16))
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*/
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int32_t usb_audio_get_prebuffering_avg(void);
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/*
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* usb_audio_get_prebuffering_maxmin():
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*
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* Return the max or min number of buffers filled ahead of playback
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* over the last feedback cycle
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*/
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int usb_audio_get_prebuffering_maxmin(bool max);
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/*
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* usb_audio_get_underflow():
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*
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* Return whether playback is in "underflow" state
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*/
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bool usb_audio_get_underflow(void);
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/*
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* usb_audio_get_overflow():
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*
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* Return whether usb is in "overflow" state
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*/
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bool usb_audio_get_overflow(void);
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/*
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* usb_audio_get_frames_dropped():
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*
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* Return the number of frames which have been dropped during playback
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*/
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int usb_audio_get_frames_dropped(void);
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/*
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* usb_audio_get_cur_volume():
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*
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* Return current audio volume in db
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*/
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int usb_audio_get_cur_volume(void);
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bool usb_audio_get_active(void);
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extern struct usb_class_driver usb_cdrv_audio;
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#endif
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