mirror of
https://github.com/Rockbox/rockbox.git
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c533222851
Does not seem to affect UI usability, but allowable DSP loads will vary based on device and playback sample rate. To-Do (someday): - Add dedicated DSP channel - How to apply DSP settings to above new channel? (UI) - How to lock out timestretch from being enabled? Change-Id: Ia24d1055340354e2c32e6008e7e2b03a8e88867d
1433 lines
47 KiB
C
1433 lines
47 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) 2010 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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/* 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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#include "string.h"
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#include "system.h"
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#include "usb_core.h"
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#include "usb_drv.h"
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#include "kernel.h"
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#include "sound.h"
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#include "usb_class_driver.h"
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#include "usb_audio_def.h"
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#include "pcm_sampr.h"
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#include "audio.h"
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#include "sound.h"
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#include "stdlib.h"
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#include "fixedpoint.h"
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#include "misc.h"
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#include "settings.h"
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#include "core_alloc.h"
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#include "pcm_mixer.h"
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#include "dsp_core.h"
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#define LOGF_ENABLE
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#include "logf.h"
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// is there a "best practices" for converting between floats and fixed point?
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// NOTE: SIGNED
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#define TO_16DOT16_FIXEDPT(val) ((int32_t)(val) * (1<<16))
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#define TO_DOUBLE(val) ((double)(val) / (1<<16))
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/* Audio Control Interface */
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static struct usb_interface_descriptor
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ac_interface =
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{
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.bLength = sizeof(struct usb_interface_descriptor),
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.bDescriptorType = USB_DT_INTERFACE,
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.bInterfaceNumber = 0,
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.bAlternateSetting = 0,
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.bNumEndpoints = 0,
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.bInterfaceClass = USB_CLASS_AUDIO,
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.bInterfaceSubClass = USB_SUBCLASS_AUDIO_CONTROL,
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.bInterfaceProtocol = 0,
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.iInterface = 0
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};
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/* Audio Control Terminals/Units*/
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static struct usb_ac_header ac_header =
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{
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.bLength = USB_AC_SIZEOF_HEADER(1), /* one interface */
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.bDescriptorType = USB_DT_CS_INTERFACE,
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.bDescriptorSubType = USB_AC_HEADER,
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.bcdADC = 0x0100, /* Identifies this as usb audio class 1.0 */
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.wTotalLength = 0, /* fill later */
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.bInCollection = 1, /* one interface */
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.baInterfaceNr = {0}, /* fill later */
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};
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enum
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{
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AC_PLAYBACK_INPUT_TERMINAL_ID = 1,
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AC_PLAYBACK_FEATURE_ID,
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AC_PLAYBACK_OUTPUT_TERMINAL_ID,
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};
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static struct usb_ac_input_terminal ac_playback_input =
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{
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.bLength = sizeof(struct usb_ac_input_terminal),
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.bDescriptorType = USB_DT_CS_INTERFACE,
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.bDescriptorSubType = USB_AC_INPUT_TERMINAL,
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.bTerminalId = AC_PLAYBACK_INPUT_TERMINAL_ID,
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.wTerminalType = USB_AC_TERMINAL_STREAMING,
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.bAssocTerminal = 0,
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.bNrChannels = 2,
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.wChannelConfig = USB_AC_CHANNELS_LEFT_RIGHT_FRONT,
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.iChannelNames = 0,
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.iTerminal = 0,
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};
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static struct usb_ac_output_terminal ac_playback_output =
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{
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.bLength = sizeof(struct usb_ac_output_terminal),
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.bDescriptorType = USB_DT_CS_INTERFACE,
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.bDescriptorSubType = USB_AC_OUTPUT_TERMINAL,
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.bTerminalId = AC_PLAYBACK_OUTPUT_TERMINAL_ID,
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.wTerminalType = USB_AC_OUTPUT_TERMINAL_HEADPHONES,
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.bAssocTerminal = 0,
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.bSourceId = AC_PLAYBACK_FEATURE_ID,
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.iTerminal = 0,
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};
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/* Feature Unit with 2 logical channels and 1 byte(8 bits) per control */
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DEFINE_USB_AC_FEATURE_UNIT(8, 2)
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static struct usb_ac_feature_unit_8_2 ac_playback_feature =
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{
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.bLength = sizeof(struct usb_ac_feature_unit_8_2),
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.bDescriptorType = USB_DT_CS_INTERFACE,
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.bDescriptorSubType = USB_AC_FEATURE_UNIT,
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.bUnitId = AC_PLAYBACK_FEATURE_ID,
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.bSourceId = AC_PLAYBACK_INPUT_TERMINAL_ID,
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.bControlSize = 1, /* by definition */
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.bmaControls = {
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[0] = USB_AC_FU_MUTE | USB_AC_FU_VOLUME,
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[1] = 0,
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[2] = 0
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},
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.iFeature = 0
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};
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/* Audio Streaming Interface */
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/* Alternative: no streaming */
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static struct usb_interface_descriptor
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as_interface_alt_idle_playback =
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{
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.bLength = sizeof(struct usb_interface_descriptor),
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.bDescriptorType = USB_DT_INTERFACE,
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.bInterfaceNumber = 0,
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.bAlternateSetting = 0,
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.bNumEndpoints = 0,
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.bInterfaceClass = USB_CLASS_AUDIO,
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.bInterfaceSubClass = USB_SUBCLASS_AUDIO_STREAMING,
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.bInterfaceProtocol = 0,
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.iInterface = 0
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};
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/* Alternative: output streaming */
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static struct usb_interface_descriptor
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as_interface_alt_playback =
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{
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.bLength = sizeof(struct usb_interface_descriptor),
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.bDescriptorType = USB_DT_INTERFACE,
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.bInterfaceNumber = 0,
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.bAlternateSetting = 1,
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.bNumEndpoints = 2, // iso audio, iso feedback
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.bInterfaceClass = USB_CLASS_AUDIO,
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.bInterfaceSubClass = USB_SUBCLASS_AUDIO_STREAMING,
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.bInterfaceProtocol = 0,
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.iInterface = 0
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};
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/* Class Specific Audio Streaming Interface */
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static struct usb_as_interface
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as_playback_cs_interface =
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{
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.bLength = sizeof(struct usb_as_interface),
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.bDescriptorType = USB_DT_CS_INTERFACE,
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.bDescriptorSubType = USB_AS_GENERAL,
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.bTerminalLink = AC_PLAYBACK_INPUT_TERMINAL_ID,
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.bDelay = 1,
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.wFormatTag = USB_AS_FORMAT_TYPE_I_PCM
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};
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static struct usb_as_format_type_i_discrete
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as_playback_format_type_i =
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{
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.bLength = USB_AS_SIZEOF_FORMAT_TYPE_I_DISCRETE((HW_FREQ_44+1)),
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.bDescriptorType = USB_DT_CS_INTERFACE,
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.bDescriptorSubType = USB_AS_FORMAT_TYPE,
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.bFormatType = USB_AS_FORMAT_TYPE_I,
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.bNrChannels = 2, /* Stereo */
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.bSubframeSize = 2, /* 2 bytes per sample */
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.bBitResolution = 16, /* all 16-bits are used */
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.bSamFreqType = (HW_FREQ_44+1),
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.tSamFreq = {
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// only values 44.1k and higher (array is in descending order)
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[0 ... HW_FREQ_44 ] = {0}, /* filled later */
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}
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};
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static struct usb_as_iso_audio_endpoint
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as_iso_audio_out_ep =
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{
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.bLength = sizeof(struct usb_as_iso_audio_endpoint),
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.bDescriptorType = USB_DT_ENDPOINT,
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.bEndpointAddress = USB_DIR_OUT, /* filled later */
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.bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC | USB_ENDPOINT_USAGE_DATA,
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.wMaxPacketSize = 0, /* filled later */
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.bInterval = 0, /* filled later - 1 for full speed, 4 for high-speed */
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.bRefresh = 0,
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.bSynchAddress = 0 /* filled later to the address of as_iso_synch_in_ep */
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};
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/*
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* Updaing the desired sample frequency:
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*
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* The iso OUT ep is inextricably linked to the feedback iso IN ep
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* when using Asynchronous mode. It periodically describes to the host
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* how fast to send the data.
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*
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* Some notes from the usbaudio 1.0 documentation:
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* - bSyncAddress of the iso OUT ep must be set to the address of the iso IN feedback ep
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* - bSyncAddress of the iso IN feedback ep must be zero
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* - F_f (desired sampling frequency) describes directly the number of samples the endpoint
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* wants to receive per frame to match the actual sampling frequency F_s
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* - There is a value, (2^(10-P)), which is how often (in 1mS frames) the F_f value will be sent
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* - P appears to be somewhat arbitrary, though the spec wants it to relate the real sample rate
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* F_s to the master clock rate F_m by the relationship (F_m = F_s * (2^(P-1)))
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* - The above description of P is somewhat moot because of how much buffering we have. I suspect it
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* was written for devices with essentially zero buffering.
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* - bRefresh of the feedback endpoint descriptor should be set to (10-P). This can range from 1 to 9.
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* A value of 1 would mean refreshing every 2^1 mS = 2 mS, a value of 9 would mean refreshing every
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* 2^9 mS = 512 mS.
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* - The F_f value should be encoded in "10.10" format, but justified to the leftmost 24 bits,
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* so it ends up looking like "10.14" format. This format is 3 bytes long. On USB 2.0, it seems that
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* the USB spec overrides the UAC 1.0 spec here, so high-speed bus operation needs "16.16" format,
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* in a 4 byte packet.
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*/
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#define FEEDBACK_UPDATE_RATE_P 5
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#define FEEDBACK_UPDATE_RATE_REFRESH (10-FEEDBACK_UPDATE_RATE_P)
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#define FEEDBACK_UPDATE_RATE_FRAMES (0x1<<FEEDBACK_UPDATE_RATE_REFRESH)
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static struct usb_as_iso_synch_endpoint
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as_iso_synch_in_ep =
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{
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.bLength = sizeof(struct usb_as_iso_synch_endpoint),
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.bDescriptorType = USB_DT_ENDPOINT,
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.bEndpointAddress = USB_DIR_IN, /* filled later */
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.bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_NONE | USB_ENDPOINT_USAGE_FEEDBACK,
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.wMaxPacketSize = 4,
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.bInterval = 0, /* filled later - 1 or 4 depending on bus speed */
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.bRefresh = FEEDBACK_UPDATE_RATE_REFRESH, /* This describes how often this ep will update F_f (see above) */
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.bSynchAddress = 0 /* MUST be zero! */
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};
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static struct usb_as_iso_ctrldata_endpoint
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as_iso_ctrldata_samfreq =
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{
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.bLength = sizeof(struct usb_as_iso_ctrldata_endpoint),
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.bDescriptorType = USB_DT_CS_ENDPOINT,
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.bDescriptorSubType = USB_AS_EP_GENERAL,
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.bmAttributes = USB_AS_EP_CS_SAMPLING_FREQ_CTL,
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.bLockDelayUnits = 0, /* undefined */
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.wLockDelay = 0 /* undefined */
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};
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static const struct usb_descriptor_header* const ac_cs_descriptors_list[] =
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{
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(struct usb_descriptor_header *) &ac_header,
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(struct usb_descriptor_header *) &ac_playback_input,
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(struct usb_descriptor_header *) &ac_playback_feature,
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(struct usb_descriptor_header *) &ac_playback_output,
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};
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#define AC_CS_DESCRIPTORS_LIST_SIZE (sizeof(ac_cs_descriptors_list)/sizeof(ac_cs_descriptors_list[0]))
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// TODO: AudioControl Interrupt endpoint to inform the host that changes were made on-device!
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// The most immediately useful of this capability is volume and mute changes.
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static const struct usb_descriptor_header* const usb_descriptors_list[] =
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{
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/* Audio Control */
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(struct usb_descriptor_header *) &ac_interface,
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(struct usb_descriptor_header *) &ac_header,
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(struct usb_descriptor_header *) &ac_playback_input,
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(struct usb_descriptor_header *) &ac_playback_feature,
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(struct usb_descriptor_header *) &ac_playback_output,
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/* Audio Streaming */
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/* Idle Playback */
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(struct usb_descriptor_header *) &as_interface_alt_idle_playback,
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/* Playback */
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(struct usb_descriptor_header *) &as_interface_alt_playback,
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(struct usb_descriptor_header *) &as_playback_cs_interface,
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(struct usb_descriptor_header *) &as_playback_format_type_i,
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/* NOTE: the order of these three is important for maximum compatibility.
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* Synch ep should follow iso out ep, with ctrldata descriptor coming first. */
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(struct usb_descriptor_header *) &as_iso_ctrldata_samfreq,
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(struct usb_descriptor_header *) &as_iso_audio_out_ep,
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(struct usb_descriptor_header *) &as_iso_synch_in_ep,
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};
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#define USB_DESCRIPTORS_LIST_SIZE (sizeof(usb_descriptors_list)/sizeof(usb_descriptors_list[0]))
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static int usb_interface; /* first interface */
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static int usb_as_playback_intf_alt; /* playback streaming interface alternate setting */
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static int as_playback_freq_idx; /* audio playback streaming frequency index (in hw_freq_sampr) */
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static int out_iso_ep_adr; /* output isochronous endpoint */
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static int in_iso_feedback_ep_adr; /* input feedback isochronous endpoint */
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/* small buffer used for control transfers */
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static unsigned char usb_buffer[128] USB_DEVBSS_ATTR;
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/* number of buffers: 2 is double-buffering (one for usb, one for playback),
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* 3 is triple-buffering (one for usb, one for playback, one for queuing), ... */
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/* Samples come in (maximum) 1023 byte chunks. Samples are also 16 bits per channel per sample.
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*
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* One buffer holds (1023 / (2Bx2ch)) = 255 (rounded down) samples
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* So the _maximum_ play time per buffer is (255 / sps).
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* For 44100 Hz: 5.7 mS
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* For 48000 Hz: 5.3 mS
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* For 192000 Hz: 1.3 mS
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*
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* From testing on MacOS (likely to be the toughest customer...) on Designware driver
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* we get data every Frame (so, every millisecond).
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*
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* If we get data every millisecond, we need 1mS to transfer 1.3mS of playback
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* in order to sustain 192 kHz playback!
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* At 44.1 kHz, the requirements are much less - 1mS of data transfer for 5.7mS of playback
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* At 48 kHz, 1mS can transfer 5.3mS of playback.
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*
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* It appears that this is "maximum", but we more likely get "enough for 1mS" every millisecond.
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*
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* Working backwards:
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* 44100 Hz: 45 samples transferred every frame (*2ch * 2bytes) = 180 bytes every frame
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* 48000 Hz: 48 samples transferred every frame (*2ch * 2bytes) = 192 bytes every frame
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* 192000 Hz: *2ch *2bytes = 768 bytes every frame
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*
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* We appear to be more limited by our PCM system's need to gobble up data at startup.
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* This may actually, contrary to intuition, make us need a higher number of buffers
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* for _lower_ sample rates, as we will need more buffers' worth of data up-front due to
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* lower amounts of data in each USB frame (assuming the mixer wants the same amount of data upfront
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* regardless of sample rate).
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*
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* Making the executive decision to only export frequencies 44.1k+.
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*/
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#define NR_BUFFERS 32
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#define MINIMUM_BUFFERS_QUEUED 16
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/* size of each buffer: must be smaller than 1023 (max isochronous packet size) */
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#define BUFFER_SIZE 1023
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/* make sure each buffer size is actually a multiple of 32 bytes to avoid any
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* issue with strange alignements */
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#define REAL_BUF_SIZE ALIGN_UP(BUFFER_SIZE, 32)
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bool alloc_failed = false;
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bool usb_audio_playing = false;
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int tmp_saved_vol;
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/* buffers used for usb, queuing and playback */
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static unsigned char *rx_buffer;
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int rx_buffer_handle;
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/* buffer size */
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static int rx_buf_size[NR_BUFFERS]; // only used for debug screen counter now
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/* index of the next buffer to play */
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static int rx_play_idx;
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/* index of the next buffer to fill */
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static int rx_usb_idx;
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/* playback underflowed ? */
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bool playback_audio_underflow;
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/* usb overflow ? */
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bool usb_rx_overflow;
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/* dsp processing buffers */
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#define DSP_BUF_SIZE (BUFFER_SIZE*4) // arbitrarily x4
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#define REAL_DSP_BUF_SIZE ALIGN_UP(DSP_BUF_SIZE, 32)
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static uint16_t *dsp_buf;
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int dsp_buf_handle;
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static int dsp_buf_size[NR_BUFFERS];
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struct dsp_config *dsp = NULL;
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/* feedback variables */
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#define USB_FRAME_MAX 0x7FF
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#define NR_SAMPLES_HISTORY 32
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int32_t samples_fb;
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int32_t buffers_filled_old;
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long buffers_filled_accumulator;
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long buffers_filled_accumulator_old;
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int buffers_filled_avgcount;
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int buffers_filled_avgcount_old;
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static uint8_t sendFf[4] USB_DEVBSS_ATTR;
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static bool sent_fb_this_frame = false;
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int fb_startframe = 0;
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bool send_fb = false;
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/* debug screen sample count display variables */
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static unsigned long samples_received;
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static unsigned long samples_received_last;
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int32_t samples_received_report;
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int buffers_filled_min;
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int buffers_filled_min_last;
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int buffers_filled_max;
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int buffers_filled_max_last;
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/* frame drop recording variables */
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static int last_frame = 0;
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static int frames_dropped = 0;
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|
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/* Schematic view of the RX situation:
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* (in case NR_BUFFERS = 4)
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*
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* +--------+ +--------+ +--------+ +--------+
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* | | | | | | | |
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* | buf[0] | ---> | buf[1] | ---> | buf[2] | ---> | buf[3] | ---> (back to buf[0])
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* | | | | | | | |
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* +--------+ +--------+ +--------+ +--------+
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* ^ ^ ^ ^
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* | | | |
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* rx_play_idx (buffer rx_usb_idx (empty buffer)
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* (buffer being filled) (buffer being
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* played) filled)
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*
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* Error handling:
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* in the RX situation, there are two possible errors
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* - playback underflow: playback wants more data but we don't have any to
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* provide, so we have to stop audio and wait for some prebuffering before
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* starting again
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* - usb overflow: usb wants to send more data but don't have any more free buffers,
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* so we have to pause usb reception and wait for some playback buffer to become
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* free again
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*/
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/* USB Audio encodes frequencies with 3 bytes... */
|
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static void encode3(uint8_t arr[3], unsigned long freq)
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{
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/* ugly */
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arr[0] = freq & 0xff;
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arr[1] = (freq >> 8) & 0xff;
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arr[2] = (freq >> 16) & 0xff;
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}
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|
|
static unsigned long decode3(uint8_t arr[3])
|
|
{
|
|
return arr[0] | (arr[1] << 8) | (arr[2] << 16);
|
|
}
|
|
|
|
// size is samples per frame!
|
|
static void encodeFBfixedpt(uint8_t arr[4], int32_t value, bool portspeed)
|
|
{
|
|
uint32_t fixedpt;
|
|
// high-speed
|
|
if (portspeed)
|
|
{
|
|
// Q16.16
|
|
fixedpt = value;
|
|
|
|
arr[0] = (fixedpt & 0xFF);
|
|
arr[1] = (fixedpt>>8) & 0xFF;
|
|
arr[2] = (fixedpt>>16) & 0xFF;
|
|
arr[3] = (fixedpt>>24) & 0xFF;
|
|
}
|
|
else // full-speed
|
|
{
|
|
// Q16.16 --> Q10.10 --> Q10.14
|
|
fixedpt = value / (1<<2); // convert from Q16.16 to Q10.14
|
|
|
|
// then aligned so it's more like Q10.14
|
|
// NOTE: this line left for posterity
|
|
// fixedpt = fixedpt << (4);
|
|
|
|
arr[0] = (fixedpt & 0xFF);
|
|
arr[1] = (fixedpt>>8) & 0xFF;
|
|
arr[2] = (fixedpt>>16) & 0xFF;
|
|
}
|
|
|
|
}
|
|
|
|
static void set_playback_sampling_frequency(unsigned long f)
|
|
{
|
|
// only values 44.1k and higher (array is in descending order)
|
|
for(int i = 0; i <= HW_FREQ_44; i++)
|
|
{
|
|
/* compare errors */
|
|
int err = abs((long)hw_freq_sampr[i] - (long)f);
|
|
int best_err = abs((long)hw_freq_sampr[as_playback_freq_idx] - (long)f);
|
|
if(err < best_err)
|
|
as_playback_freq_idx = i;
|
|
}
|
|
|
|
logf("usbaudio: set playback sampling frequency to %lu Hz for a requested %lu Hz",
|
|
hw_freq_sampr[as_playback_freq_idx], f);
|
|
|
|
mixer_set_frequency(hw_freq_sampr[as_playback_freq_idx]);
|
|
pcm_apply_settings();
|
|
}
|
|
|
|
unsigned long usb_audio_get_playback_sampling_frequency(void)
|
|
{
|
|
// logf("usbaudio: get playback sampl freq %lu Hz", hw_freq_sampr[as_playback_freq_idx]);
|
|
return hw_freq_sampr[as_playback_freq_idx];
|
|
}
|
|
|
|
void usb_audio_init(void)
|
|
{
|
|
unsigned int i;
|
|
/* initialized tSamFreq array */
|
|
logf("usbaudio: (init) supported frequencies");
|
|
// only values 44.1k and higher (array is in descending order)
|
|
for(i = 0; i <= HW_FREQ_44; i++)
|
|
{
|
|
logf("usbaudio: %lu Hz", hw_freq_sampr[i]);
|
|
encode3(as_playback_format_type_i.tSamFreq[i], hw_freq_sampr[i]);
|
|
}
|
|
}
|
|
|
|
int usb_audio_request_buf(void)
|
|
{
|
|
// stop playback first thing
|
|
audio_stop();
|
|
|
|
// attempt to allocate the receive buffers
|
|
rx_buffer_handle = core_alloc(REAL_BUF_SIZE);
|
|
if (rx_buffer_handle < 0)
|
|
{
|
|
alloc_failed = true;
|
|
return -1;
|
|
}
|
|
else
|
|
{
|
|
alloc_failed = false;
|
|
|
|
// "pin" the allocation so that the core does not move it in memory
|
|
core_pin(rx_buffer_handle);
|
|
|
|
// get the pointer to the actual buffer location
|
|
rx_buffer = core_get_data(rx_buffer_handle);
|
|
}
|
|
|
|
dsp_buf_handle = core_alloc(NR_BUFFERS * REAL_DSP_BUF_SIZE);
|
|
if (dsp_buf_handle < 0)
|
|
{
|
|
alloc_failed = true;
|
|
rx_buffer_handle = core_free(rx_buffer_handle);
|
|
rx_buffer = NULL;
|
|
return -1;
|
|
}
|
|
else
|
|
{
|
|
alloc_failed = false;
|
|
|
|
core_pin(dsp_buf_handle);
|
|
|
|
dsp_buf = core_get_data(dsp_buf_handle);
|
|
}
|
|
// logf("usbaudio: got buffer");
|
|
return 0;
|
|
}
|
|
|
|
void usb_audio_free_buf(void)
|
|
{
|
|
// logf("usbaudio: free buffer");
|
|
rx_buffer_handle = core_free(rx_buffer_handle);
|
|
rx_buffer = NULL;
|
|
|
|
dsp_buf_handle = core_free(dsp_buf_handle);
|
|
dsp_buf = NULL;
|
|
}
|
|
|
|
int usb_audio_request_endpoints(struct usb_class_driver *drv)
|
|
{
|
|
// make sure we can get the buffers first...
|
|
// return -1 if the allocation _failed_
|
|
if (usb_audio_request_buf())
|
|
return -1;
|
|
|
|
out_iso_ep_adr = usb_core_request_endpoint(USB_ENDPOINT_XFER_ISOC, USB_DIR_OUT, drv);
|
|
if(out_iso_ep_adr < 0)
|
|
{
|
|
logf("usbaudio: cannot get an out iso endpoint");
|
|
return -1;
|
|
}
|
|
|
|
in_iso_feedback_ep_adr = usb_core_request_endpoint(USB_ENDPOINT_XFER_ISOC, USB_DIR_IN, drv);
|
|
if(in_iso_feedback_ep_adr < 0)
|
|
{
|
|
usb_core_release_endpoint(out_iso_ep_adr);
|
|
logf("usbaudio: cannot get an in iso endpoint");
|
|
return -1;
|
|
}
|
|
|
|
logf("usbaudio: iso out ep is 0x%x, in ep is 0x%x", out_iso_ep_adr, in_iso_feedback_ep_adr);
|
|
|
|
as_iso_audio_out_ep.bEndpointAddress = out_iso_ep_adr;
|
|
as_iso_audio_out_ep.bSynchAddress = in_iso_feedback_ep_adr;
|
|
|
|
as_iso_synch_in_ep.bEndpointAddress = in_iso_feedback_ep_adr;
|
|
as_iso_synch_in_ep.bSynchAddress = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
unsigned int usb_audio_get_out_ep(void)
|
|
{
|
|
return out_iso_ep_adr;
|
|
}
|
|
|
|
unsigned int usb_audio_get_in_ep(void)
|
|
{
|
|
return in_iso_feedback_ep_adr;
|
|
}
|
|
|
|
int usb_audio_set_first_interface(int interface)
|
|
{
|
|
usb_interface = interface;
|
|
logf("usbaudio: usb_interface=%d", usb_interface);
|
|
return interface + 2; /* Audio Control and Audio Streaming */
|
|
}
|
|
|
|
int usb_audio_get_config_descriptor(unsigned char *dest, int max_packet_size)
|
|
{
|
|
(void)max_packet_size;
|
|
unsigned int i;
|
|
unsigned char *orig_dest = dest;
|
|
|
|
logf("get config descriptors");
|
|
|
|
/** Configuration */
|
|
|
|
/* header */
|
|
ac_header.baInterfaceNr[0] = usb_interface + 1;
|
|
|
|
/* audio control interface */
|
|
ac_interface.bInterfaceNumber = usb_interface;
|
|
|
|
/* compute total size of AC headers*/
|
|
ac_header.wTotalLength = 0;
|
|
for(i = 0; i < AC_CS_DESCRIPTORS_LIST_SIZE; i++)
|
|
ac_header.wTotalLength += ac_cs_descriptors_list[i]->bLength;
|
|
|
|
/* audio streaming */
|
|
as_interface_alt_idle_playback.bInterfaceNumber = usb_interface + 1;
|
|
as_interface_alt_playback.bInterfaceNumber = usb_interface + 1;
|
|
|
|
/* endpoints */
|
|
as_iso_audio_out_ep.wMaxPacketSize = 1023;
|
|
|
|
/** Endpoint Interval calculation:
|
|
* typically sampling frequency is 44100 Hz and top is 192000 Hz, which
|
|
* account for typical 44100*2(stereo)*2(16-bit) ~= 180 kB/s
|
|
* and top 770 kB/s. Since there are ~1000 frames per seconds and maximum
|
|
* packet size is set to 1023, one transaction per frame is good enough
|
|
* for over 1 MB/s.
|
|
* Recall that actual is 2^(bInterval - 1) */
|
|
|
|
/* In simpler language, This is intended to emulate full-speed's
|
|
* one-packet-per-frame rate on high-speed, where we have multiple microframes per millisecond.
|
|
*/
|
|
as_iso_audio_out_ep.bInterval = usb_drv_port_speed() ? 4 : 1;
|
|
as_iso_synch_in_ep.bInterval = usb_drv_port_speed() ? 4 : 1; // per spec
|
|
|
|
logf("usbaudio: port_speed=%s", usb_drv_port_speed()?"hs":"fs");
|
|
|
|
/** Packing */
|
|
for(i = 0; i < USB_DESCRIPTORS_LIST_SIZE; i++)
|
|
{
|
|
memcpy(dest, usb_descriptors_list[i], usb_descriptors_list[i]->bLength);
|
|
dest += usb_descriptors_list[i]->bLength;
|
|
}
|
|
|
|
return dest - orig_dest;
|
|
}
|
|
|
|
static void playback_audio_get_more(const void **start, size_t *size)
|
|
{
|
|
/* if there are no more filled buffers, playback has just underflowed */
|
|
if(rx_play_idx == rx_usb_idx)
|
|
{
|
|
logf("usbaudio: playback underflow");
|
|
playback_audio_underflow = true;
|
|
*start = NULL;
|
|
*size = 0;
|
|
return;
|
|
}
|
|
|
|
/* give buffer and advance */
|
|
logf("usbaudio: buf adv");
|
|
*start = dsp_buf + (rx_play_idx * REAL_DSP_BUF_SIZE/sizeof(*dsp_buf));
|
|
*size = dsp_buf_size[rx_play_idx];
|
|
rx_play_idx = (rx_play_idx + 1) % NR_BUFFERS;
|
|
|
|
/* if usb RX buffers had overflowed, we can start to receive again
|
|
* guard against IRQ to avoid race with completion usb completion (although
|
|
* this function is probably running in IRQ context anyway) */
|
|
int oldlevel = disable_irq_save();
|
|
if(usb_rx_overflow)
|
|
{
|
|
logf("usbaudio: recover usb rx overflow");
|
|
usb_rx_overflow = false;
|
|
usb_drv_recv_nonblocking(out_iso_ep_adr, rx_buffer, BUFFER_SIZE);
|
|
}
|
|
restore_irq(oldlevel);
|
|
}
|
|
|
|
static void usb_audio_start_playback(void)
|
|
{
|
|
usb_audio_playing = true;
|
|
usb_rx_overflow = false;
|
|
playback_audio_underflow = true;
|
|
rx_play_idx = 0;
|
|
rx_usb_idx = 0;
|
|
|
|
// feedback initialization
|
|
fb_startframe = usb_drv_get_frame_number();
|
|
samples_fb = 0;
|
|
samples_received_report = 0;
|
|
|
|
// debug screen info - frame drop counter
|
|
frames_dropped = 0;
|
|
last_frame = -1;
|
|
buffers_filled_min = -1;
|
|
buffers_filled_min_last = -1;
|
|
buffers_filled_max = -1;
|
|
buffers_filled_max_last = -1;
|
|
|
|
// debug screen info - sample counters
|
|
samples_received = 0;
|
|
samples_received_last = 0;
|
|
|
|
// TODO: implement recording from the USB stream
|
|
#if (INPUT_SRC_CAPS != 0)
|
|
audio_set_input_source(AUDIO_SRC_PLAYBACK, SRCF_PLAYBACK);
|
|
audio_set_output_source(AUDIO_SRC_PLAYBACK);
|
|
#endif
|
|
logf("usbaudio: start playback at %lu Hz", hw_freq_sampr[as_playback_freq_idx]);
|
|
mixer_set_frequency(hw_freq_sampr[as_playback_freq_idx]);
|
|
pcm_apply_settings();
|
|
mixer_channel_set_amplitude(PCM_MIXER_CHAN_USBAUDIO, MIX_AMP_UNITY);
|
|
|
|
usb_drv_recv_nonblocking(out_iso_ep_adr, rx_buffer, BUFFER_SIZE);
|
|
}
|
|
|
|
static void usb_audio_stop_playback(void)
|
|
{
|
|
logf("usbaudio: stop playback");
|
|
if(usb_audio_playing)
|
|
{
|
|
mixer_channel_stop(PCM_MIXER_CHAN_USBAUDIO);
|
|
usb_audio_playing = false;
|
|
}
|
|
send_fb = false;
|
|
}
|
|
|
|
int usb_audio_set_interface(int intf, int alt)
|
|
{
|
|
if(intf == usb_interface)
|
|
{
|
|
if(alt != 0)
|
|
{
|
|
logf("usbaudio: control interface has no alternate %d", alt);
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
if(intf == (usb_interface + 1))
|
|
{
|
|
if(alt < 0 || alt > 1)
|
|
{
|
|
logf("usbaudio: playback interface has no alternate %d", alt);
|
|
return -1;
|
|
}
|
|
usb_as_playback_intf_alt = alt;
|
|
|
|
if(usb_as_playback_intf_alt == 1)
|
|
usb_audio_start_playback();
|
|
else
|
|
usb_audio_stop_playback();
|
|
logf("usbaudio: use playback alternate %d", alt);
|
|
|
|
return 0;
|
|
}
|
|
else
|
|
{
|
|
logf("usbaudio: interface %d has no alternate", intf);
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
int usb_audio_get_interface(int intf)
|
|
{
|
|
if(intf == usb_interface)
|
|
{
|
|
logf("usbaudio: control interface alternate is 0");
|
|
return 0;
|
|
}
|
|
else if(intf == (usb_interface + 1))
|
|
{
|
|
logf("usbaudio: playback interface alternate is %d", usb_as_playback_intf_alt);
|
|
return usb_as_playback_intf_alt;
|
|
}
|
|
else
|
|
{
|
|
logf("usbaudio: unknown interface %d", intf);
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
int usb_audio_get_main_intf(void)
|
|
{
|
|
return usb_interface;
|
|
}
|
|
|
|
int usb_audio_get_alt_intf(void)
|
|
{
|
|
return usb_as_playback_intf_alt;
|
|
}
|
|
|
|
int32_t usb_audio_get_samplesperframe(void)
|
|
{
|
|
return samples_fb;
|
|
}
|
|
|
|
int32_t usb_audio_get_samples_rx_perframe(void)
|
|
{
|
|
return samples_received_report;
|
|
}
|
|
|
|
static bool usb_audio_as_ctrldata_endpoint_request(struct usb_ctrlrequest* req, void *reqdata)
|
|
{
|
|
/* only support sampling frequency */
|
|
if(req->wValue != (USB_AS_EP_CS_SAMPLING_FREQ_CTL << 8))
|
|
{
|
|
logf("usbaudio: endpoint only handles sampling frequency control");
|
|
return false;
|
|
}
|
|
|
|
switch(req->bRequest)
|
|
{
|
|
case USB_AC_SET_CUR:
|
|
if(req->wLength != 3)
|
|
{
|
|
logf("usbaudio: bad length for SET_CUR");
|
|
usb_drv_control_response(USB_CONTROL_STALL, NULL, 0);
|
|
return true;
|
|
}
|
|
logf("usbaudio: SET_CUR sampling freq");
|
|
|
|
if (reqdata) { /* control write, second pass */
|
|
set_playback_sampling_frequency(decode3(reqdata));
|
|
usb_drv_control_response(USB_CONTROL_ACK, NULL, 0);
|
|
return true;
|
|
} else { /* control write, first pass */
|
|
bool error = false;
|
|
|
|
if (req->wLength != 3)
|
|
error = true;
|
|
/* ... other validation? */
|
|
|
|
if (error)
|
|
usb_drv_control_response(USB_CONTROL_STALL, NULL, 0);
|
|
else
|
|
usb_drv_control_response(USB_CONTROL_RECEIVE, usb_buffer, 3);
|
|
|
|
return true;
|
|
}
|
|
|
|
case USB_AC_GET_CUR:
|
|
if(req->wLength != 3)
|
|
{
|
|
logf("usbaudio: bad length for GET_CUR");
|
|
usb_drv_control_response(USB_CONTROL_STALL, NULL, 0);
|
|
return true;
|
|
}
|
|
logf("usbaudio: GET_CUR sampling freq");
|
|
encode3(usb_buffer, usb_audio_get_playback_sampling_frequency());
|
|
usb_drv_control_response(USB_CONTROL_ACK, usb_buffer, req->wLength);
|
|
|
|
return true;
|
|
|
|
default:
|
|
logf("usbaudio: unhandled ep req 0x%x", req->bRequest);
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
static bool usb_audio_endpoint_request(struct usb_ctrlrequest* req, void *reqdata)
|
|
{
|
|
int ep = req->wIndex & 0xff;
|
|
|
|
if(ep == out_iso_ep_adr)
|
|
return usb_audio_as_ctrldata_endpoint_request(req, reqdata);
|
|
else
|
|
{
|
|
logf("usbaudio: unhandled ep req (ep=%d)", ep);
|
|
return false;
|
|
}
|
|
}
|
|
|
|
static bool feature_unit_set_mute(int value, uint8_t cmd)
|
|
{
|
|
if(cmd != USB_AC_CUR_REQ)
|
|
{
|
|
logf("usbaudio: feature unit MUTE control only has a CUR setting");
|
|
return false;
|
|
}
|
|
|
|
if(value == 1)
|
|
{
|
|
logf("usbaudio: mute !");
|
|
tmp_saved_vol = sound_current(SOUND_VOLUME);
|
|
|
|
// setvol does range checking for us!
|
|
global_status.volume = sound_min(SOUND_VOLUME);
|
|
setvol();
|
|
return true;
|
|
}
|
|
else if(value == 0)
|
|
{
|
|
logf("usbaudio: not muted !");
|
|
|
|
// setvol does range checking for us!
|
|
global_status.volume = tmp_saved_vol;
|
|
setvol();
|
|
return true;
|
|
}
|
|
else
|
|
{
|
|
logf("usbaudio: invalid value for CUR setting of feature unit (%d)", value);
|
|
return false;
|
|
}
|
|
}
|
|
|
|
static bool feature_unit_get_mute(int *value, uint8_t cmd)
|
|
{
|
|
if(cmd != USB_AC_CUR_REQ)
|
|
{
|
|
logf("usbaudio: feature unit MUTE control only has a CUR setting");
|
|
return false;
|
|
}
|
|
|
|
*value = (sound_current(SOUND_VOLUME) == sound_min(SOUND_VOLUME));
|
|
return true;
|
|
}
|
|
|
|
/*
|
|
* USB volume is a signed 16-bit value, -127.9961 dB (0x8001) to +127.9961 dB (0x7FFF)
|
|
* in steps of 1/256 dB (0.00390625 dB)
|
|
*
|
|
* We need to account for different devices having different numbers of decimals
|
|
*/
|
|
// TODO: do we need to explicitly round these? Will we have a "walking" round conversion issue?
|
|
// Step values of 1 dB (and multiples), and 0.5 dB should be able to be met exactly,
|
|
// presuming that it starts on an even number.
|
|
static int usb_audio_volume_to_db(int vol, int numdecimals)
|
|
{
|
|
int tmp = (signed long)((signed short)vol * ipow(10, numdecimals)) / 256;
|
|
// logf("vol=0x%04X, numdecimals=%d, tmp=%d", vol, numdecimals, tmp);
|
|
return tmp;
|
|
}
|
|
static int db_to_usb_audio_volume(int db, int numdecimals)
|
|
{
|
|
int tmp = (signed long)(db * 256) / ipow(10, numdecimals);
|
|
// logf("db=%d, numdecimals=%d, tmpTodB=%d", db, numdecimals, usb_audio_volume_to_db(tmp, numdecimals));
|
|
return tmp;
|
|
}
|
|
|
|
#if defined(LOGF_ENABLE) && defined(ROCKBOX_HAS_LOGF)
|
|
static const char *usb_audio_ac_ctl_req_str(uint8_t cmd)
|
|
{
|
|
switch(cmd)
|
|
{
|
|
case USB_AC_CUR_REQ: return "CUR";
|
|
case USB_AC_MIN_REQ: return "MIN";
|
|
case USB_AC_MAX_REQ: return "MAX";
|
|
case USB_AC_RES_REQ: return "RES";
|
|
case USB_AC_MEM_REQ: return "MEM";
|
|
default: return "<unknown>";
|
|
}
|
|
}
|
|
#endif
|
|
|
|
static bool feature_unit_set_volume(int value, uint8_t cmd)
|
|
{
|
|
if(cmd != USB_AC_CUR_REQ)
|
|
{
|
|
logf("usbaudio: feature unit VOLUME doesn't support %s setting", usb_audio_ac_ctl_req_str(cmd));
|
|
return false;
|
|
}
|
|
|
|
logf("usbaudio: set volume=%d dB", usb_audio_volume_to_db(value, sound_numdecimals(SOUND_VOLUME)));
|
|
|
|
// setvol does range checking for us!
|
|
// we cannot guarantee the host will send us a volume within our range
|
|
global_status.volume = usb_audio_volume_to_db(value, sound_numdecimals(SOUND_VOLUME));
|
|
setvol();
|
|
return true;
|
|
}
|
|
|
|
static bool feature_unit_get_volume(int *value, uint8_t cmd)
|
|
{
|
|
switch(cmd)
|
|
{
|
|
case USB_AC_CUR_REQ: *value = db_to_usb_audio_volume(sound_current(SOUND_VOLUME), sound_numdecimals(SOUND_VOLUME)); break;
|
|
case USB_AC_MIN_REQ: *value = db_to_usb_audio_volume(sound_min(SOUND_VOLUME), sound_numdecimals(SOUND_VOLUME)); break;
|
|
case USB_AC_MAX_REQ: *value = db_to_usb_audio_volume(sound_max(SOUND_VOLUME), sound_numdecimals(SOUND_VOLUME)); break;
|
|
case USB_AC_RES_REQ: *value = db_to_usb_audio_volume(sound_steps(SOUND_VOLUME), sound_numdecimals(SOUND_VOLUME)); break;
|
|
default:
|
|
logf("usbaudio: feature unit VOLUME doesn't support %s setting", usb_audio_ac_ctl_req_str(cmd));
|
|
return false;
|
|
}
|
|
|
|
// logf("usbaudio: get %s volume=%d dB", usb_audio_ac_ctl_req_str(cmd), usb_audio_volume_to_db(*value, sound_numdecimals(SOUND_VOLUME)));
|
|
return true;
|
|
}
|
|
|
|
int usb_audio_get_cur_volume(void)
|
|
{
|
|
int vol;
|
|
feature_unit_get_volume(&vol, USB_AC_CUR_REQ);
|
|
return usb_audio_volume_to_db(vol, sound_numdecimals(SOUND_VOLUME));
|
|
}
|
|
|
|
static bool usb_audio_set_get_feature_unit(struct usb_ctrlrequest* req, void *reqdata)
|
|
{
|
|
int channel = req->wValue & 0xff;
|
|
int selector = req->wValue >> 8;
|
|
uint8_t cmd = (req->bRequest & ~USB_AC_GET_REQ);
|
|
int value = 0;
|
|
int i;
|
|
bool handled;
|
|
|
|
/* master channel only */
|
|
if(channel != 0)
|
|
{
|
|
logf("usbaudio: set/get on feature unit only apply to master channel (%d)", channel);
|
|
return false;
|
|
}
|
|
/* selectors */
|
|
/* all send/received values are integers already - read data if necessary and store in it in an integer */
|
|
if(req->bRequest & USB_AC_GET_REQ)
|
|
{
|
|
/* get */
|
|
switch(selector)
|
|
{
|
|
case USB_AC_FU_MUTE:
|
|
handled = (req->wLength == 1) && feature_unit_get_mute(&value, cmd);
|
|
break;
|
|
case USB_AC_VOLUME_CONTROL:
|
|
handled = (req->wLength == 2) && feature_unit_get_volume(&value, cmd);
|
|
break;
|
|
default:
|
|
handled = false;
|
|
logf("usbaudio: unhandled control selector of feature unit (0x%x)", selector);
|
|
break;
|
|
}
|
|
|
|
if(!handled)
|
|
{
|
|
logf("usbaudio: unhandled get control 0x%x selector 0x%x of feature unit", cmd, selector);
|
|
usb_drv_control_response(USB_CONTROL_STALL, NULL, 0);
|
|
return true;
|
|
}
|
|
|
|
if(req->wLength == 0 || req->wLength > 4)
|
|
{
|
|
logf("usbaudio: get data payload size is invalid (%d)", req->wLength);
|
|
return false;
|
|
}
|
|
|
|
for(i = 0; i < req->wLength; i++)
|
|
usb_buffer[i] = (value >> (8 * i)) & 0xff;
|
|
|
|
usb_drv_control_response(USB_CONTROL_ACK, usb_buffer, req->wLength);
|
|
return true;
|
|
}
|
|
else
|
|
{
|
|
/* set */
|
|
if(req->wLength == 0 || req->wLength > 4)
|
|
{
|
|
logf("usbaudio: set data payload size is invalid (%d)", req->wLength);
|
|
return false;
|
|
}
|
|
|
|
if (reqdata) {
|
|
|
|
for(i = 0; i < req->wLength; i++)
|
|
value = value | (usb_buffer[i] << (i * 8));
|
|
|
|
switch(selector)
|
|
{
|
|
case USB_AC_FU_MUTE:
|
|
handled = (req->wLength == 1) && feature_unit_set_mute(value, cmd);
|
|
break;
|
|
case USB_AC_VOLUME_CONTROL:
|
|
handled = (req->wLength == 2) && feature_unit_set_volume(value, cmd);
|
|
break;
|
|
default:
|
|
handled = false;
|
|
logf("usbaudio: unhandled control selector of feature unit (0x%x)", selector);
|
|
break;
|
|
}
|
|
|
|
if(!handled)
|
|
{
|
|
logf("usbaudio: unhandled set control 0x%x selector 0x%x of feature unit", cmd, selector);
|
|
usb_drv_control_response(USB_CONTROL_STALL, NULL, 0);
|
|
return true;
|
|
}
|
|
|
|
usb_drv_control_response(USB_CONTROL_ACK, NULL, 0);
|
|
return true;
|
|
} else {
|
|
/*
|
|
* should handle the following (req->wValue >> 8):
|
|
* USB_AC_FU_MUTE
|
|
* USB_AC_VOLUME_CONTROL
|
|
*/
|
|
|
|
bool error = false;
|
|
|
|
if (error)
|
|
usb_drv_control_response(USB_CONTROL_STALL, NULL, 0);
|
|
else
|
|
usb_drv_control_response(USB_CONTROL_RECEIVE, usb_buffer, 3);
|
|
|
|
return true;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
}
|
|
|
|
static bool usb_audio_ac_set_get_request(struct usb_ctrlrequest* req, void *reqdata)
|
|
{
|
|
switch(req->wIndex >> 8)
|
|
{
|
|
case AC_PLAYBACK_FEATURE_ID:
|
|
return usb_audio_set_get_feature_unit(req, reqdata);
|
|
default:
|
|
logf("usbaudio: unhandled set/get on entity %d", req->wIndex >> 8);
|
|
return false;
|
|
}
|
|
}
|
|
|
|
static bool usb_audio_interface_request(struct usb_ctrlrequest* req, void *reqdata)
|
|
{
|
|
int intf = req->wIndex & 0xff;
|
|
|
|
if(intf == usb_interface)
|
|
{
|
|
switch(req->bRequest)
|
|
{
|
|
case USB_AC_SET_CUR: case USB_AC_SET_MIN: case USB_AC_SET_MAX: case USB_AC_SET_RES:
|
|
case USB_AC_SET_MEM: case USB_AC_GET_CUR: case USB_AC_GET_MIN: case USB_AC_GET_MAX:
|
|
case USB_AC_GET_RES: case USB_AC_GET_MEM:
|
|
return usb_audio_ac_set_get_request(req, reqdata);
|
|
default:
|
|
logf("usbaudio: unhandled ac intf req 0x%x", req->bRequest);
|
|
return false;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
logf("usbaudio: unhandled intf req (intf=%d)", intf);
|
|
return false;
|
|
}
|
|
}
|
|
|
|
bool usb_audio_control_request(struct usb_ctrlrequest* req, void *reqdata, unsigned char* dest)
|
|
{
|
|
(void) reqdata;
|
|
(void) dest;
|
|
|
|
switch(req->bRequestType & USB_RECIP_MASK)
|
|
{
|
|
case USB_RECIP_ENDPOINT:
|
|
return usb_audio_endpoint_request(req, reqdata);
|
|
case USB_RECIP_INTERFACE:
|
|
return usb_audio_interface_request(req, reqdata);
|
|
default:
|
|
logf("usbaudio: unhandled req type 0x%x", req->bRequestType);
|
|
return false;
|
|
}
|
|
}
|
|
|
|
void usb_audio_init_connection(void)
|
|
{
|
|
logf("usbaudio: init connection");
|
|
|
|
dsp = dsp_get_config(CODEC_IDX_AUDIO);
|
|
dsp_configure(dsp, DSP_RESET, 0);
|
|
dsp_configure(dsp, DSP_SET_STEREO_MODE, STEREO_INTERLEAVED);
|
|
dsp_configure(dsp, DSP_SET_SAMPLE_DEPTH, 16);
|
|
#ifdef HAVE_PITCHCONTROL
|
|
sound_set_pitch(PITCH_SPEED_100);
|
|
dsp_set_timestretch(PITCH_SPEED_100);
|
|
#endif
|
|
|
|
usb_as_playback_intf_alt = 0;
|
|
set_playback_sampling_frequency(HW_SAMPR_DEFAULT);
|
|
tmp_saved_vol = sound_current(SOUND_VOLUME);
|
|
usb_audio_playing = false;
|
|
}
|
|
|
|
void usb_audio_disconnect(void)
|
|
{
|
|
logf("usbaudio: disconnect");
|
|
|
|
usb_audio_stop_playback();
|
|
usb_audio_free_buf();
|
|
}
|
|
|
|
bool usb_audio_get_alloc_failed(void)
|
|
{
|
|
return alloc_failed;
|
|
}
|
|
|
|
bool usb_audio_get_playing(void)
|
|
{
|
|
return usb_audio_playing;
|
|
}
|
|
|
|
/* determine if enough prebuffering has been done to restart audio */
|
|
bool prebuffering_done(void)
|
|
{
|
|
/* restart audio if at least MINIMUM_BUFFERS_QUEUED buffers are filled */
|
|
int diff = (rx_usb_idx - rx_play_idx + NR_BUFFERS) % NR_BUFFERS;
|
|
return diff >= MINIMUM_BUFFERS_QUEUED;
|
|
}
|
|
|
|
int usb_audio_get_prebuffering(void)
|
|
{
|
|
return (rx_usb_idx - rx_play_idx + NR_BUFFERS) % NR_BUFFERS;
|
|
}
|
|
|
|
int32_t usb_audio_get_prebuffering_avg(void)
|
|
{
|
|
if (buffers_filled_avgcount == 0)
|
|
{
|
|
return TO_16DOT16_FIXEDPT(usb_audio_get_prebuffering());
|
|
} else {
|
|
return (TO_16DOT16_FIXEDPT(buffers_filled_accumulator)/buffers_filled_avgcount) + TO_16DOT16_FIXEDPT(MINIMUM_BUFFERS_QUEUED);
|
|
}
|
|
}
|
|
|
|
int usb_audio_get_prebuffering_maxmin(bool max)
|
|
{
|
|
if (max)
|
|
{
|
|
return buffers_filled_max == -1 ? buffers_filled_max_last : buffers_filled_max;
|
|
}
|
|
else
|
|
{
|
|
return buffers_filled_min == -1 ? buffers_filled_min_last : buffers_filled_min;
|
|
}
|
|
}
|
|
|
|
bool usb_audio_get_underflow(void)
|
|
{
|
|
return playback_audio_underflow;
|
|
}
|
|
|
|
bool usb_audio_get_overflow(void)
|
|
{
|
|
return usb_rx_overflow;
|
|
}
|
|
|
|
int usb_audio_get_frames_dropped(void)
|
|
{
|
|
return frames_dropped;
|
|
}
|
|
|
|
void usb_audio_transfer_complete(int ep, int dir, int status, int length)
|
|
{
|
|
/* normal handler is too slow to handle the completion rate, because
|
|
* of the low thread schedule rate */
|
|
(void) ep;
|
|
(void) dir;
|
|
(void) status;
|
|
(void) length;
|
|
}
|
|
|
|
bool usb_audio_fast_transfer_complete(int ep, int dir, int status, int length)
|
|
{
|
|
(void) dir;
|
|
bool retval = false;
|
|
|
|
if(ep == out_iso_ep_adr && usb_as_playback_intf_alt == 1)
|
|
{
|
|
// check for dropped frames
|
|
if (last_frame != usb_drv_get_frame_number())
|
|
{
|
|
if ((((last_frame + 1) % (USB_FRAME_MAX + 1)) != usb_drv_get_frame_number()) && (last_frame != -1))
|
|
{
|
|
frames_dropped++;
|
|
}
|
|
last_frame = usb_drv_get_frame_number();
|
|
}
|
|
|
|
// If audio and feedback EPs happen to have the same base number (with opposite directions, of course),
|
|
// we will get replies to the feedback here, don't want that to be interpreted as data.
|
|
if (length <= 4)
|
|
{
|
|
return true;
|
|
}
|
|
|
|
logf("usbaudio: frame: %d bytes: %d", usb_drv_get_frame_number(), length);
|
|
if(status != 0)
|
|
return true; /* FIXME how to handle error here ? */
|
|
|
|
/* store length, queue buffer */
|
|
rx_buf_size[rx_usb_idx] = length;
|
|
|
|
// debug screen counter
|
|
samples_received = samples_received + length;
|
|
|
|
// process through DSP right away!
|
|
struct dsp_buffer src;
|
|
src.remcount = length/4; // in samples
|
|
src.pin[0] = rx_buffer;
|
|
src.proc_mask = 0;
|
|
|
|
struct dsp_buffer dst;
|
|
dst.remcount = 0;
|
|
dst.bufcount = DSP_BUF_SIZE/4; // in samples
|
|
dst.p16out = dsp_buf + (rx_usb_idx * REAL_DSP_BUF_SIZE/sizeof(*dsp_buf)); // array index
|
|
|
|
dsp_process(dsp, &src, &dst, false);
|
|
dsp_buf_size[rx_usb_idx] = dst.remcount * 2 * sizeof(*dsp_buf); // need value in bytes
|
|
|
|
rx_usb_idx = (rx_usb_idx + 1) % NR_BUFFERS;
|
|
|
|
/* guard against IRQ to avoid race with completion audio completion */
|
|
int oldlevel = disable_irq_save();
|
|
/* setup a new transaction except if we ran out of buffers */
|
|
if(rx_usb_idx != rx_play_idx)
|
|
{
|
|
logf("usbaudio: new transaction");
|
|
usb_drv_recv_nonblocking(out_iso_ep_adr, rx_buffer, BUFFER_SIZE);
|
|
}
|
|
else
|
|
{
|
|
logf("usbaudio: rx overflow");
|
|
usb_rx_overflow = true;
|
|
}
|
|
/* if audio underflowed and prebuffering is done, restart audio */
|
|
if(playback_audio_underflow && prebuffering_done())
|
|
{
|
|
logf("usbaudio: prebuffering done");
|
|
playback_audio_underflow = false;
|
|
usb_rx_overflow = false;
|
|
mixer_channel_play_data(PCM_MIXER_CHAN_USBAUDIO, playback_audio_get_more, NULL, 0);
|
|
}
|
|
restore_irq(oldlevel);
|
|
retval = true;
|
|
}
|
|
else
|
|
{
|
|
retval = false;
|
|
}
|
|
|
|
// send feedback value every N frames!
|
|
// NOTE: important that we need to queue this up _the frame before_ it's needed - on MacOS especially!
|
|
if ((usb_drv_get_frame_number()+1) % FEEDBACK_UPDATE_RATE_FRAMES == 0 && send_fb)
|
|
{
|
|
if (!sent_fb_this_frame)
|
|
{
|
|
/* NOTE: the division of frequency must be staged to avoid overflow of 16-bit signed int
|
|
* as well as truncating the result to ones place!
|
|
* Must avoid values > 32,768 (2^15)
|
|
* Largest value: 192,000 --> /10: 19,200 --> /100: 192
|
|
* Smallest value: 44,100 --> /10: 4,410 --> /100: 44.1
|
|
*/
|
|
int32_t samples_base = TO_16DOT16_FIXEDPT(hw_freq_sampr[as_playback_freq_idx]/10)/100;
|
|
int32_t buffers_filled = 0;
|
|
|
|
if (buffers_filled_avgcount != 0)
|
|
{
|
|
buffers_filled = TO_16DOT16_FIXEDPT((int32_t)buffers_filled_accumulator) / buffers_filled_avgcount;
|
|
}
|
|
buffers_filled_accumulator = buffers_filled_accumulator - buffers_filled_accumulator_old;
|
|
buffers_filled_avgcount = buffers_filled_avgcount - buffers_filled_avgcount_old;
|
|
buffers_filled_accumulator_old = buffers_filled_accumulator;
|
|
buffers_filled_avgcount_old = buffers_filled_avgcount;
|
|
|
|
// someone who has implemented actual PID before might be able to do this correctly,
|
|
// but this seems to work good enough?
|
|
// Coefficients were 1, 0.25, 0.025 in float math --> 1, /4, /40 in fixed-point math
|
|
samples_fb = samples_base - (buffers_filled/4) + ((buffers_filled_old - buffers_filled)/40);
|
|
buffers_filled_old = buffers_filled;
|
|
|
|
// must limit to +/- 1 sample from nominal
|
|
samples_fb = samples_fb > (samples_base + TO_16DOT16_FIXEDPT(1)) ? samples_base + TO_16DOT16_FIXEDPT(1) : samples_fb;
|
|
samples_fb = samples_fb < (samples_base - TO_16DOT16_FIXEDPT(1)) ? samples_base - TO_16DOT16_FIXEDPT(1) : samples_fb;
|
|
|
|
encodeFBfixedpt(sendFf, samples_fb, usb_drv_port_speed());
|
|
logf("usbaudio: frame %d fbval 0x%02X%02X%02X%02X", usb_drv_get_frame_number(), sendFf[3], sendFf[2], sendFf[1], sendFf[0]);
|
|
usb_drv_send_nonblocking(in_iso_feedback_ep_adr, sendFf, usb_drv_port_speed()?4:3);
|
|
|
|
// debug screen counters
|
|
//
|
|
// samples_received NOTE: need some "division staging" to not overflow signed 16-bit value
|
|
// samples / (feedback frames * 2) --> samples/2
|
|
// samples_report / (2ch * 2bytes per sample) --> samples/4
|
|
// total: samples/8
|
|
samples_received_report = TO_16DOT16_FIXEDPT(samples_received/8) / FEEDBACK_UPDATE_RATE_FRAMES;
|
|
samples_received = samples_received - samples_received_last;
|
|
samples_received_last = samples_received;
|
|
buffers_filled_max_last = buffers_filled_max;
|
|
buffers_filled_max = -1;
|
|
buffers_filled_min_last = buffers_filled_min;
|
|
buffers_filled_min = -1;
|
|
}
|
|
sent_fb_this_frame = true;
|
|
}
|
|
else
|
|
{
|
|
sent_fb_this_frame = false;
|
|
if (!send_fb)
|
|
{
|
|
// arbitrary wait during startup
|
|
if (usb_drv_get_frame_number() == (fb_startframe + (FEEDBACK_UPDATE_RATE_FRAMES*2))%(USB_FRAME_MAX+1))
|
|
{
|
|
send_fb = true;
|
|
}
|
|
}
|
|
buffers_filled_accumulator = buffers_filled_accumulator + (usb_audio_get_prebuffering() - MINIMUM_BUFFERS_QUEUED);
|
|
buffers_filled_avgcount++;
|
|
if (usb_audio_get_prebuffering() < buffers_filled_min || buffers_filled_min == -1)
|
|
{
|
|
buffers_filled_min = usb_audio_get_prebuffering();
|
|
} else if (usb_audio_get_prebuffering() > buffers_filled_max)
|
|
{
|
|
buffers_filled_max = usb_audio_get_prebuffering();
|
|
}
|
|
}
|
|
|
|
return retval;
|
|
}
|