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audio_device.c
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audio_device.c
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/*
* The MIT License (MIT)
*
* Copyright (c) 2020 Reinhard Panhuber, Jerzy Kasenberg
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
* This file is part of the TinyUSB stack.
*/
/*
* This driver supports at most one out EP, one in EP, one control EP, and one feedback EP and one alternative interface other than zero. Hence, only one input terminal and one output terminal are support, if you need more adjust the driver!
* It supports multiple TX and RX channels.
*
* In case you need more alternate interfaces, you need to define additional defines for this specific alternate interface. Just define them and set them in the set_interface function.
*
* There are three data flow structures currently implemented, where at least one SW-FIFO is used to decouple the asynchronous processes MCU vs. host
*
* 1. Input data -> SW-FIFO -> MCU USB
*
* The most easiest version, available in case the target MCU can handle the software FIFO (SW-FIFO) and if it is implemented in the device driver (if yes then dcd_edpt_xfer_fifo() is available)
*
* 2. Input data -> SW-FIFO -> Linear buffer -> MCU USB
*
* In case the target MCU can not handle a SW-FIFO, a linear buffer is used. This uses the default function dcd_edpt_xfer(). In this case more memory is required.
*
* 3. (Input data 1 | Input data 2 | ... | Input data N) -> (SW-FIFO 1 | SW-FIFO 2 | ... | SW-FIFO N) -> Linear buffer -> MCU USB
*
* This case is used if you have more channels which need to be combined into one stream. Every channel has its own SW-FIFO. All data is encoded into an Linear buffer.
*
* The same holds in the RX case.
*
* */
#include "tusb_option.h"
#if (CFG_TUD_ENABLED && CFG_TUD_AUDIO)
//--------------------------------------------------------------------+
// INCLUDE
//--------------------------------------------------------------------+
#include "device/usbd.h"
#include "device/usbd_pvt.h"
#include "audio_device.h"
//--------------------------------------------------------------------+
// MACRO CONSTANT TYPEDEF
//--------------------------------------------------------------------+
// Use ring buffer if it's available, some MCUs need extra RAM requirements
#ifndef TUD_AUDIO_PREFER_RING_BUFFER
#if CFG_TUSB_MCU == OPT_MCU_LPC43XX || CFG_TUSB_MCU == OPT_MCU_LPC18XX || CFG_TUSB_MCU == OPT_MCU_MIMXRT1XXX
#define TUD_AUDIO_PREFER_RING_BUFFER 0
#else
#define TUD_AUDIO_PREFER_RING_BUFFER 1
#endif
#endif
// Linear buffer in case target MCU is not capable of handling a ring buffer FIFO e.g. no hardware buffer
// is available or driver is would need to be changed dramatically
// Only STM32 and dcd_transdimension use non-linear buffer for now
// dwc2 except esp32sx (since it may use dcd_esp32sx)
#if (defined(TUP_USBIP_DWC2) && !TU_CHECK_MCU(OPT_MCU_ESP32S2, OPT_MCU_ESP32S3)) || \
defined(TUP_USBIP_FSDEV) || \
CFG_TUSB_MCU == OPT_MCU_RX63X || \
CFG_TUSB_MCU == OPT_MCU_RX65X || \
CFG_TUSB_MCU == OPT_MCU_RX72N || \
CFG_TUSB_MCU == OPT_MCU_LPC18XX || \
CFG_TUSB_MCU == OPT_MCU_LPC43XX || \
CFG_TUSB_MCU == OPT_MCU_MIMXRT1XXX || \
CFG_TUSB_MCU == OPT_MCU_MSP432E4
#if TUD_AUDIO_PREFER_RING_BUFFER
#define USE_LINEAR_BUFFER 0
#else
#define USE_LINEAR_BUFFER 1
#endif
#else
#define USE_LINEAR_BUFFER 1
#endif
// Temporarily put the check here for stm32_fsdev
#ifdef TUP_USBIP_FSDEV
#define USE_ISO_EP_ALLOCATION 1
#else
#define USE_ISO_EP_ALLOCATION 0
#endif
// Declaration of buffers
// Check for maximum supported numbers
#if CFG_TUD_AUDIO > 3
#error Maximum number of audio functions restricted to three!
#endif
// Put sw_buf in USB section only if necessary
#if USE_LINEAR_BUFFER || CFG_TUD_AUDIO_ENABLE_ENCODING
#define IN_SW_BUF_MEM_SECTION
#else
#define IN_SW_BUF_MEM_SECTION CFG_TUD_MEM_SECTION
#endif
#if USE_LINEAR_BUFFER || CFG_TUD_AUDIO_ENABLE_DECODING
#define OUT_SW_BUF_MEM_SECTION
#else
#define OUT_SW_BUF_MEM_SECTION CFG_TUD_MEM_SECTION
#endif
// EP IN software buffers and mutexes
#if CFG_TUD_AUDIO_ENABLE_EP_IN && !CFG_TUD_AUDIO_ENABLE_ENCODING
#if CFG_TUD_AUDIO_FUNC_1_EP_IN_SW_BUF_SZ > 0
IN_SW_BUF_MEM_SECTION CFG_TUSB_MEM_ALIGN uint8_t audio_ep_in_sw_buf_1[CFG_TUD_AUDIO_FUNC_1_EP_IN_SW_BUF_SZ];
#if CFG_FIFO_MUTEX
osal_mutex_def_t ep_in_ff_mutex_wr_1; // No need for read mutex as only USB driver reads from FIFO
#endif
#endif // CFG_TUD_AUDIO_FUNC_1_EP_IN_SW_BUF_SZ > 0
#if CFG_TUD_AUDIO > 1 && CFG_TUD_AUDIO_FUNC_2_EP_IN_SW_BUF_SZ > 0
IN_SW_BUF_MEM_SECTION CFG_TUSB_MEM_ALIGN uint8_t audio_ep_in_sw_buf_2[CFG_TUD_AUDIO_FUNC_2_EP_IN_SW_BUF_SZ];
#if CFG_FIFO_MUTEX
osal_mutex_def_t ep_in_ff_mutex_wr_2; // No need for read mutex as only USB driver reads from FIFO
#endif
#endif // CFG_TUD_AUDIO > 1 && CFG_TUD_AUDIO_FUNC_2_EP_IN_SW_BUF_SZ > 0
#if CFG_TUD_AUDIO > 2 && CFG_TUD_AUDIO_FUNC_3_EP_IN_SW_BUF_SZ > 0
IN_SW_BUF_MEM_SECTION CFG_TUSB_MEM_ALIGN uint8_t audio_ep_in_sw_buf_3[CFG_TUD_AUDIO_FUNC_3_EP_IN_SW_BUF_SZ];
#if CFG_FIFO_MUTEX
osal_mutex_def_t ep_in_ff_mutex_wr_3; // No need for read mutex as only USB driver reads from FIFO
#endif
#endif // CFG_TUD_AUDIO > 2 && CFG_TUD_AUDIO_FUNC_3_EP_IN_SW_BUF_SZ > 0
#endif // CFG_TUD_AUDIO_ENABLE_EP_IN && !CFG_TUD_AUDIO_ENABLE_ENCODING
// Linear buffer TX in case:
// - target MCU is not capable of handling a ring buffer FIFO e.g. no hardware buffer is available or driver is would need to be changed dramatically OR
// - the software encoding is used - in this case the linear buffers serve as a target memory where logical channels are encoded into
#if CFG_TUD_AUDIO_ENABLE_EP_IN && (USE_LINEAR_BUFFER || CFG_TUD_AUDIO_ENABLE_ENCODING)
#if CFG_TUD_AUDIO_FUNC_1_EP_IN_SZ_MAX > 0
CFG_TUD_MEM_SECTION CFG_TUSB_MEM_ALIGN uint8_t lin_buf_in_1[CFG_TUD_AUDIO_FUNC_1_EP_IN_SZ_MAX];
#endif
#if CFG_TUD_AUDIO > 1 && CFG_TUD_AUDIO_FUNC_2_EP_IN_SZ_MAX > 0
CFG_TUD_MEM_SECTION CFG_TUSB_MEM_ALIGN uint8_t lin_buf_in_2[CFG_TUD_AUDIO_FUNC_2_EP_IN_SZ_MAX];
#endif
#if CFG_TUD_AUDIO > 2 && CFG_TUD_AUDIO_FUNC_3_EP_IN_SZ_MAX > 0
CFG_TUD_MEM_SECTION CFG_TUSB_MEM_ALIGN uint8_t lin_buf_in_3[CFG_TUD_AUDIO_FUNC_3_EP_IN_SZ_MAX];
#endif
#endif // CFG_TUD_AUDIO_ENABLE_EP_IN && (USE_LINEAR_BUFFER || CFG_TUD_AUDIO_ENABLE_DECODING)
// EP OUT software buffers and mutexes
#if CFG_TUD_AUDIO_ENABLE_EP_OUT && !CFG_TUD_AUDIO_ENABLE_DECODING
#if CFG_TUD_AUDIO_FUNC_1_EP_OUT_SW_BUF_SZ > 0
OUT_SW_BUF_MEM_SECTION CFG_TUSB_MEM_ALIGN uint8_t audio_ep_out_sw_buf_1[CFG_TUD_AUDIO_FUNC_1_EP_OUT_SW_BUF_SZ];
#if CFG_FIFO_MUTEX
osal_mutex_def_t ep_out_ff_mutex_rd_1; // No need for write mutex as only USB driver writes into FIFO
#endif
#endif // CFG_TUD_AUDIO_FUNC_1_EP_OUT_SW_BUF_SZ > 0
#if CFG_TUD_AUDIO > 1 && CFG_TUD_AUDIO_FUNC_2_EP_OUT_SW_BUF_SZ > 0
OUT_SW_BUF_MEM_SECTION CFG_TUSB_MEM_ALIGN uint8_t audio_ep_out_sw_buf_2[CFG_TUD_AUDIO_FUNC_2_EP_OUT_SW_BUF_SZ];
#if CFG_FIFO_MUTEX
osal_mutex_def_t ep_out_ff_mutex_rd_2; // No need for write mutex as only USB driver writes into FIFO
#endif
#endif // CFG_TUD_AUDIO > 1 && CFG_TUD_AUDIO_FUNC_2_EP_OUT_SW_BUF_SZ > 0
#if CFG_TUD_AUDIO > 2 && CFG_TUD_AUDIO_FUNC_3_EP_OUT_SW_BUF_SZ > 0
OUT_SW_BUF_MEM_SECTION CFG_TUSB_MEM_ALIGN uint8_t audio_ep_out_sw_buf_3[CFG_TUD_AUDIO_FUNC_3_EP_OUT_SW_BUF_SZ];
#if CFG_FIFO_MUTEX
osal_mutex_def_t ep_out_ff_mutex_rd_3; // No need for write mutex as only USB driver writes into FIFO
#endif
#endif // CFG_TUD_AUDIO > 2 && CFG_TUD_AUDIO_FUNC_3_EP_OUT_SW_BUF_SZ > 0
#endif // CFG_TUD_AUDIO_ENABLE_EP_OUT && !CFG_TUD_AUDIO_ENABLE_DECODING
// Linear buffer RX in case:
// - target MCU is not capable of handling a ring buffer FIFO e.g. no hardware buffer is available or driver is would need to be changed dramatically OR
// - the software encoding is used - in this case the linear buffers serve as a target memory where logical channels are encoded into
#if CFG_TUD_AUDIO_ENABLE_EP_OUT && (USE_LINEAR_BUFFER || CFG_TUD_AUDIO_ENABLE_DECODING)
#if CFG_TUD_AUDIO_FUNC_1_EP_OUT_SZ_MAX > 0
CFG_TUD_MEM_SECTION CFG_TUSB_MEM_ALIGN uint8_t lin_buf_out_1[CFG_TUD_AUDIO_FUNC_1_EP_OUT_SZ_MAX];
#endif
#if CFG_TUD_AUDIO > 1 && CFG_TUD_AUDIO_FUNC_2_EP_OUT_SZ_MAX > 0
CFG_TUD_MEM_SECTION CFG_TUSB_MEM_ALIGN uint8_t lin_buf_out_2[CFG_TUD_AUDIO_FUNC_2_EP_OUT_SZ_MAX];
#endif
#if CFG_TUD_AUDIO > 2 && CFG_TUD_AUDIO_FUNC_3_EP_OUT_SZ_MAX > 0
CFG_TUD_MEM_SECTION CFG_TUSB_MEM_ALIGN uint8_t lin_buf_out_3[CFG_TUD_AUDIO_FUNC_3_EP_OUT_SZ_MAX];
#endif
#endif // CFG_TUD_AUDIO_ENABLE_EP_OUT && (USE_LINEAR_BUFFER || CFG_TUD_AUDIO_ENABLE_DECODING)
// Control buffers
CFG_TUD_MEM_SECTION CFG_TUSB_MEM_ALIGN uint8_t ctrl_buf_1[CFG_TUD_AUDIO_FUNC_1_CTRL_BUF_SZ];
#if CFG_TUD_AUDIO > 1
CFG_TUD_MEM_SECTION CFG_TUSB_MEM_ALIGN uint8_t ctrl_buf_2[CFG_TUD_AUDIO_FUNC_2_CTRL_BUF_SZ];
#endif
#if CFG_TUD_AUDIO > 2
CFG_TUD_MEM_SECTION CFG_TUSB_MEM_ALIGN uint8_t ctrl_buf_3[CFG_TUD_AUDIO_FUNC_3_CTRL_BUF_SZ];
#endif
// Active alternate setting of interfaces
uint8_t alt_setting_1[CFG_TUD_AUDIO_FUNC_1_N_AS_INT];
#if CFG_TUD_AUDIO > 1 && CFG_TUD_AUDIO_FUNC_2_N_AS_INT > 0
uint8_t alt_setting_2[CFG_TUD_AUDIO_FUNC_2_N_AS_INT];
#endif
#if CFG_TUD_AUDIO > 2 && CFG_TUD_AUDIO_FUNC_3_N_AS_INT > 0
uint8_t alt_setting_3[CFG_TUD_AUDIO_FUNC_3_N_AS_INT];
#endif
// Software encoding/decoding support FIFOs
#if CFG_TUD_AUDIO_ENABLE_EP_IN && CFG_TUD_AUDIO_ENABLE_ENCODING
#if CFG_TUD_AUDIO_FUNC_1_TX_SUPP_SW_FIFO_SZ > 0
CFG_TUSB_MEM_ALIGN uint8_t tx_supp_ff_buf_1[CFG_TUD_AUDIO_FUNC_1_N_TX_SUPP_SW_FIFO][CFG_TUD_AUDIO_FUNC_1_TX_SUPP_SW_FIFO_SZ];
tu_fifo_t tx_supp_ff_1[CFG_TUD_AUDIO_FUNC_1_N_TX_SUPP_SW_FIFO];
#if CFG_FIFO_MUTEX
osal_mutex_def_t tx_supp_ff_mutex_wr_1[CFG_TUD_AUDIO_FUNC_1_N_TX_SUPP_SW_FIFO]; // No need for read mutex as only USB driver reads from FIFO
#endif
#endif
#if CFG_TUD_AUDIO > 1 && CFG_TUD_AUDIO_FUNC_2_TX_SUPP_SW_FIFO_SZ > 0
CFG_TUSB_MEM_ALIGN uint8_t tx_supp_ff_buf_2[CFG_TUD_AUDIO_FUNC_2_N_TX_SUPP_SW_FIFO][CFG_TUD_AUDIO_FUNC_2_TX_SUPP_SW_FIFO_SZ];
tu_fifo_t tx_supp_ff_2[CFG_TUD_AUDIO_FUNC_2_N_TX_SUPP_SW_FIFO];
#if CFG_FIFO_MUTEX
osal_mutex_def_t tx_supp_ff_mutex_wr_2[CFG_TUD_AUDIO_FUNC_2_N_TX_SUPP_SW_FIFO]; // No need for read mutex as only USB driver reads from FIFO
#endif
#endif
#if CFG_TUD_AUDIO > 2 && CFG_TUD_AUDIO_FUNC_3_TX_SUPP_SW_FIFO_SZ > 0
CFG_TUSB_MEM_ALIGN uint8_t tx_supp_ff_buf_3[CFG_TUD_AUDIO_FUNC_3_N_TX_SUPP_SW_FIFO][CFG_TUD_AUDIO_FUNC_3_TX_SUPP_SW_FIFO_SZ];
tu_fifo_t tx_supp_ff_3[CFG_TUD_AUDIO_FUNC_3_N_TX_SUPP_SW_FIFO];
#if CFG_FIFO_MUTEX
osal_mutex_def_t tx_supp_ff_mutex_wr_3[CFG_TUD_AUDIO_FUNC_3_N_TX_SUPP_SW_FIFO]; // No need for read mutex as only USB driver reads from FIFO
#endif
#endif
#endif
#if CFG_TUD_AUDIO_ENABLE_EP_OUT && CFG_TUD_AUDIO_ENABLE_DECODING
#if CFG_TUD_AUDIO_FUNC_1_RX_SUPP_SW_FIFO_SZ > 0
CFG_TUSB_MEM_ALIGN uint8_t rx_supp_ff_buf_1[CFG_TUD_AUDIO_FUNC_1_N_RX_SUPP_SW_FIFO][CFG_TUD_AUDIO_FUNC_1_RX_SUPP_SW_FIFO_SZ];
tu_fifo_t rx_supp_ff_1[CFG_TUD_AUDIO_FUNC_1_N_RX_SUPP_SW_FIFO];
#if CFG_FIFO_MUTEX
osal_mutex_def_t rx_supp_ff_mutex_rd_1[CFG_TUD_AUDIO_FUNC_1_N_RX_SUPP_SW_FIFO]; // No need for write mutex as only USB driver writes into FIFO
#endif
#endif
#if CFG_TUD_AUDIO > 1 && CFG_TUD_AUDIO_FUNC_2_RX_SUPP_SW_FIFO_SZ > 0
CFG_TUSB_MEM_ALIGN uint8_t rx_supp_ff_buf_2[CFG_TUD_AUDIO_FUNC_2_N_RX_SUPP_SW_FIFO][CFG_TUD_AUDIO_FUNC_2_RX_SUPP_SW_FIFO_SZ];
tu_fifo_t rx_supp_ff_2[CFG_TUD_AUDIO_FUNC_2_N_RX_SUPP_SW_FIFO];
#if CFG_FIFO_MUTEX
osal_mutex_def_t rx_supp_ff_mutex_rd_2[CFG_TUD_AUDIO_FUNC_2_N_RX_SUPP_SW_FIFO]; // No need for write mutex as only USB driver writes into FIFO
#endif
#endif
#if CFG_TUD_AUDIO > 2 && CFG_TUD_AUDIO_FUNC_3_RX_SUPP_SW_FIFO_SZ > 0
CFG_TUSB_MEM_ALIGN uint8_t rx_supp_ff_buf_3[CFG_TUD_AUDIO_FUNC_3_N_RX_SUPP_SW_FIFO][CFG_TUD_AUDIO_FUNC_3_RX_SUPP_SW_FIFO_SZ];
tu_fifo_t rx_supp_ff_3[CFG_TUD_AUDIO_FUNC_3_N_RX_SUPP_SW_FIFO];
#if CFG_FIFO_MUTEX
osal_mutex_def_t rx_supp_ff_mutex_rd_3[CFG_TUD_AUDIO_FUNC_3_N_RX_SUPP_SW_FIFO]; // No need for write mutex as only USB driver writes into FIFO
#endif
#endif
#endif
typedef struct
{
uint8_t rhport;
uint8_t const * p_desc; // Pointer pointing to Standard AC Interface Descriptor(4.7.1) - Audio Control descriptor defining audio function
#if CFG_TUD_AUDIO_ENABLE_EP_IN
uint8_t ep_in; // TX audio data EP.
uint16_t ep_in_sz; // Current size of TX EP
uint8_t ep_in_as_intf_num; // Corresponding Standard AS Interface Descriptor (4.9.1) belonging to output terminal to which this EP belongs - 0 is invalid (this fits to UAC2 specification since AS interfaces can not have interface number equal to zero)
#endif
#if CFG_TUD_AUDIO_ENABLE_EP_OUT
uint8_t ep_out; // Incoming (into uC) audio data EP.
uint16_t ep_out_sz; // Current size of RX EP
uint8_t ep_out_as_intf_num; // Corresponding Standard AS Interface Descriptor (4.9.1) belonging to input terminal to which this EP belongs - 0 is invalid (this fits to UAC2 specification since AS interfaces can not have interface number equal to zero)
#if CFG_TUD_AUDIO_ENABLE_FEEDBACK_EP
uint8_t ep_fb; // Feedback EP.
#endif
#endif
#if CFG_TUD_AUDIO_INT_CTR_EPSIZE_IN
uint8_t ep_int_ctr; // Audio control interrupt EP.
#endif
/*------------- From this point, data is not cleared by bus reset -------------*/
uint16_t desc_length; // Length of audio function descriptor
// Buffer for control requests
uint8_t * ctrl_buf;
uint8_t ctrl_buf_sz;
// Current active alternate settings
uint8_t * alt_setting; // We need to save the current alternate setting this way, because it is possible that there are AS interfaces which do not have an EP!
// EP Transfer buffers and FIFOs
#if CFG_TUD_AUDIO_ENABLE_EP_OUT
#if !CFG_TUD_AUDIO_ENABLE_DECODING
tu_fifo_t ep_out_ff;
#endif
#if CFG_TUD_AUDIO_ENABLE_FEEDBACK_EP
struct {
CFG_TUSB_MEM_ALIGN uint32_t value; // Feedback value for asynchronous mode (in 16.16 format).
uint32_t min_value; // min value according to UAC2 FMT-2.0 section 2.3.1.1.
uint32_t max_value; // max value according to UAC2 FMT-2.0 section 2.3.1.1.
uint8_t frame_shift; // bInterval-1 in unit of frame (FS), micro-frame (HS)
uint8_t compute_method;
union {
uint8_t power_of_2; // pre-computed power of 2 shift
float float_const; // pre-computed float constant
struct {
uint32_t sample_freq;
uint32_t mclk_freq;
}fixed;
#if 0 // implement later
struct {
uint32_t nominal_value;
uint32_t threshold_bytes;
}fifo_count;
#endif
}compute;
} feedback;
#endif // CFG_TUD_AUDIO_ENABLE_FEEDBACK_EP
#endif // CFG_TUD_AUDIO_ENABLE_EP_OUT
#if CFG_TUD_AUDIO_ENABLE_EP_IN && !CFG_TUD_AUDIO_ENABLE_ENCODING
tu_fifo_t ep_in_ff;
#endif
// Audio control interrupt buffer - no FIFO - 6 Bytes according to UAC 2 specification (p. 74)
#if CFG_TUD_AUDIO_INT_CTR_EPSIZE_IN
CFG_TUSB_MEM_ALIGN uint8_t ep_int_ctr_buf[CFG_TUD_AUDIO_INT_CTR_EP_IN_SW_BUFFER_SIZE];
#endif
// Decoding parameters - parameters are set when alternate AS interface is set by host
// Coding is currently only supported for EP. Software coding corresponding to AS interfaces without EPs are not supported currently.
#if CFG_TUD_AUDIO_ENABLE_EP_OUT && CFG_TUD_AUDIO_ENABLE_DECODING
audio_format_type_t format_type_rx;
uint8_t n_channels_rx;
#if CFG_TUD_AUDIO_ENABLE_TYPE_I_DECODING
audio_data_format_type_I_t format_type_I_rx;
uint8_t n_bytes_per_sampe_rx;
uint8_t n_channels_per_ff_rx;
uint8_t n_ff_used_rx;
#endif
#endif
#if CFG_TUD_AUDIO_ENABLE_EP_IN && CFG_TUD_AUDIO_EP_IN_FLOW_CONTROL
uint32_t sample_rate_tx;
uint16_t packet_sz_tx[3];
uint8_t bclock_id_tx;
uint8_t interval_tx;
#endif
// Encoding parameters - parameters are set when alternate AS interface is set by host
#if CFG_TUD_AUDIO_ENABLE_EP_IN && (CFG_TUD_AUDIO_ENABLE_ENCODING || CFG_TUD_AUDIO_EP_IN_FLOW_CONTROL)
audio_format_type_t format_type_tx;
uint8_t n_channels_tx;
uint8_t n_bytes_per_sampe_tx;
#if CFG_TUD_AUDIO_ENABLE_TYPE_I_ENCODING
audio_data_format_type_I_t format_type_I_tx;
uint8_t n_channels_per_ff_tx;
uint8_t n_ff_used_tx;
#endif
#endif
// Support FIFOs for software encoding and decoding
#if CFG_TUD_AUDIO_ENABLE_EP_OUT && CFG_TUD_AUDIO_ENABLE_DECODING
tu_fifo_t * rx_supp_ff;
uint8_t n_rx_supp_ff;
uint16_t rx_supp_ff_sz_max;
#endif
#if CFG_TUD_AUDIO_ENABLE_EP_IN && CFG_TUD_AUDIO_ENABLE_ENCODING
tu_fifo_t * tx_supp_ff;
uint8_t n_tx_supp_ff;
uint16_t tx_supp_ff_sz_max;
#endif
// Linear buffer in case target MCU is not capable of handling a ring buffer FIFO e.g. no hardware buffer is available or driver is would need to be changed dramatically OR the support FIFOs are used
#if CFG_TUD_AUDIO_ENABLE_EP_OUT && (USE_LINEAR_BUFFER || CFG_TUD_AUDIO_ENABLE_DECODING)
uint8_t * lin_buf_out;
#define USE_LINEAR_BUFFER_RX 1
#endif
#if CFG_TUD_AUDIO_ENABLE_EP_IN && (USE_LINEAR_BUFFER || CFG_TUD_AUDIO_ENABLE_ENCODING)
uint8_t * lin_buf_in;
#define USE_LINEAR_BUFFER_TX 1
#endif
} audiod_function_t;
#ifndef USE_LINEAR_BUFFER_TX
#define USE_LINEAR_BUFFER_TX 0
#endif
#ifndef USE_LINEAR_BUFFER_RX
#define USE_LINEAR_BUFFER_RX 0
#endif
#define ITF_MEM_RESET_SIZE offsetof(audiod_function_t, ctrl_buf)
//--------------------------------------------------------------------+
// INTERNAL OBJECT & FUNCTION DECLARATION
//--------------------------------------------------------------------+
CFG_TUD_MEM_SECTION audiod_function_t _audiod_fct[CFG_TUD_AUDIO];
#if CFG_TUD_AUDIO_ENABLE_EP_OUT
static bool audiod_rx_done_cb(uint8_t rhport, audiod_function_t* audio, uint16_t n_bytes_received);
#endif
#if CFG_TUD_AUDIO_ENABLE_DECODING && CFG_TUD_AUDIO_ENABLE_EP_OUT
static bool audiod_decode_type_I_pcm(uint8_t rhport, audiod_function_t* audio, uint16_t n_bytes_received);
#endif
#if CFG_TUD_AUDIO_ENABLE_EP_IN
static bool audiod_tx_done_cb(uint8_t rhport, audiod_function_t* audio);
#endif
#if CFG_TUD_AUDIO_ENABLE_ENCODING && CFG_TUD_AUDIO_ENABLE_EP_IN
static uint16_t audiod_encode_type_I_pcm(uint8_t rhport, audiod_function_t* audio);
#endif
static bool audiod_get_interface(uint8_t rhport, tusb_control_request_t const * p_request);
static bool audiod_set_interface(uint8_t rhport, tusb_control_request_t const * p_request);
static bool audiod_get_AS_interface_index_global(uint8_t itf, uint8_t *func_id, uint8_t *idxItf, uint8_t const **pp_desc_int);
static bool audiod_get_AS_interface_index(uint8_t itf, audiod_function_t * audio, uint8_t *idxItf, uint8_t const **pp_desc_int);
static bool audiod_verify_entity_exists(uint8_t itf, uint8_t entityID, uint8_t *func_id);
static bool audiod_verify_itf_exists(uint8_t itf, uint8_t *func_id);
static bool audiod_verify_ep_exists(uint8_t ep, uint8_t *func_id);
static uint8_t audiod_get_audio_fct_idx(audiod_function_t * audio);
#if (CFG_TUD_AUDIO_ENABLE_EP_IN && (CFG_TUD_AUDIO_EP_IN_FLOW_CONTROL || CFG_TUD_AUDIO_ENABLE_ENCODING)) || (CFG_TUD_AUDIO_ENABLE_EP_OUT && CFG_TUD_AUDIO_ENABLE_DECODING)
static void audiod_parse_for_AS_params(audiod_function_t* audio, uint8_t const * p_desc, uint8_t const * p_desc_end, uint8_t const as_itf);
static inline uint8_t tu_desc_subtype(void const* desc)
{
return ((uint8_t const*) desc)[2];
}
#endif
#if CFG_TUD_AUDIO_ENABLE_EP_IN && CFG_TUD_AUDIO_EP_IN_FLOW_CONTROL
static bool audiod_calc_tx_packet_sz(audiod_function_t* audio);
static uint16_t audiod_tx_packet_size(const uint16_t* norminal_size, uint16_t data_count, uint16_t fifo_depth, uint16_t max_size);
#endif
#if CFG_TUD_AUDIO_ENABLE_EP_OUT && CFG_TUD_AUDIO_ENABLE_FEEDBACK_EP
static bool set_fb_params_freq(audiod_function_t* audio, uint32_t sample_freq, uint32_t mclk_freq);
#endif
bool tud_audio_n_mounted(uint8_t func_id)
{
TU_VERIFY(func_id < CFG_TUD_AUDIO);
audiod_function_t* audio = &_audiod_fct[func_id];
#if CFG_TUD_AUDIO_ENABLE_EP_OUT
if (audio->ep_out == 0) return false;
#endif
#if CFG_TUD_AUDIO_ENABLE_EP_IN
if (audio->ep_in == 0) return false;
#endif
#if CFG_TUD_AUDIO_INT_CTR_EPSIZE_IN
if (audio->ep_int_ctr == 0) return false;
#endif
#if CFG_TUD_AUDIO_ENABLE_FEEDBACK_EP
if (audio->ep_fb == 0) return false;
#endif
return true;
}
//--------------------------------------------------------------------+
// READ API
//--------------------------------------------------------------------+
#if CFG_TUD_AUDIO_ENABLE_EP_OUT && !CFG_TUD_AUDIO_ENABLE_DECODING
uint16_t tud_audio_n_available(uint8_t func_id)
{
TU_VERIFY(func_id < CFG_TUD_AUDIO && _audiod_fct[func_id].p_desc != NULL);
return tu_fifo_count(&_audiod_fct[func_id].ep_out_ff);
}
uint16_t tud_audio_n_read(uint8_t func_id, void* buffer, uint16_t bufsize)
{
TU_VERIFY(func_id < CFG_TUD_AUDIO && _audiod_fct[func_id].p_desc != NULL);
return tu_fifo_read_n(&_audiod_fct[func_id].ep_out_ff, buffer, bufsize);
}
bool tud_audio_n_clear_ep_out_ff(uint8_t func_id)
{
TU_VERIFY(func_id < CFG_TUD_AUDIO && _audiod_fct[func_id].p_desc != NULL);
return tu_fifo_clear(&_audiod_fct[func_id].ep_out_ff);
}
tu_fifo_t* tud_audio_n_get_ep_out_ff(uint8_t func_id)
{
if(func_id < CFG_TUD_AUDIO && _audiod_fct[func_id].p_desc != NULL) return &_audiod_fct[func_id].ep_out_ff;
return NULL;
}
#endif
#if CFG_TUD_AUDIO_ENABLE_DECODING && CFG_TUD_AUDIO_ENABLE_EP_OUT
// Delete all content in the support RX FIFOs
bool tud_audio_n_clear_rx_support_ff(uint8_t func_id, uint8_t ff_idx)
{
TU_VERIFY(func_id < CFG_TUD_AUDIO && _audiod_fct[func_id].p_desc != NULL && ff_idx < _audiod_fct[func_id].n_rx_supp_ff);
return tu_fifo_clear(&_audiod_fct[func_id].rx_supp_ff[ff_idx]);
}
uint16_t tud_audio_n_available_support_ff(uint8_t func_id, uint8_t ff_idx)
{
TU_VERIFY(func_id < CFG_TUD_AUDIO && _audiod_fct[func_id].p_desc != NULL && ff_idx < _audiod_fct[func_id].n_rx_supp_ff);
return tu_fifo_count(&_audiod_fct[func_id].rx_supp_ff[ff_idx]);
}
uint16_t tud_audio_n_read_support_ff(uint8_t func_id, uint8_t ff_idx, void* buffer, uint16_t bufsize)
{
TU_VERIFY(func_id < CFG_TUD_AUDIO && _audiod_fct[func_id].p_desc != NULL && ff_idx < _audiod_fct[func_id].n_rx_supp_ff);
return tu_fifo_read_n(&_audiod_fct[func_id].rx_supp_ff[ff_idx], buffer, bufsize);
}
tu_fifo_t* tud_audio_n_get_rx_support_ff(uint8_t func_id, uint8_t ff_idx)
{
if(func_id < CFG_TUD_AUDIO && _audiod_fct[func_id].p_desc != NULL && ff_idx < _audiod_fct[func_id].n_rx_supp_ff) return &_audiod_fct[func_id].rx_supp_ff[ff_idx];
return NULL;
}
#endif
// This function is called once an audio packet is received by the USB and is responsible for putting data from USB memory into EP_OUT_FIFO (or support FIFOs + decoding of received stream into audio channels).
// If you prefer your own (more efficient) implementation suiting your purpose set CFG_TUD_AUDIO_ENABLE_DECODING = 0.
#if CFG_TUD_AUDIO_ENABLE_EP_OUT
static bool audiod_rx_done_cb(uint8_t rhport, audiod_function_t* audio, uint16_t n_bytes_received)
{
uint8_t idxItf = 0;
uint8_t const *dummy2;
uint8_t idx_audio_fct = 0;
if (tud_audio_rx_done_pre_read_cb || tud_audio_rx_done_post_read_cb)
{
idx_audio_fct = audiod_get_audio_fct_idx(audio);
TU_VERIFY(audiod_get_AS_interface_index(audio->ep_out_as_intf_num, audio, &idxItf, &dummy2));
}
// Call a weak callback here - a possibility for user to get informed an audio packet was received and data gets now loaded into EP FIFO (or decoded into support RX software FIFO)
if (tud_audio_rx_done_pre_read_cb)
{
TU_VERIFY(tud_audio_rx_done_pre_read_cb(rhport, n_bytes_received, idx_audio_fct, audio->ep_out, audio->alt_setting[idxItf]));
}
#if CFG_TUD_AUDIO_ENABLE_DECODING && CFG_TUD_AUDIO_ENABLE_EP_OUT
switch (audio->format_type_rx)
{
case AUDIO_FORMAT_TYPE_UNDEFINED:
// INDIVIDUAL DECODING PROCEDURE REQUIRED HERE!
TU_LOG2(" Desired CFG_TUD_AUDIO_FORMAT encoding not implemented!\r\n");
TU_BREAKPOINT();
break;
case AUDIO_FORMAT_TYPE_I:
switch (audio->format_type_I_rx)
{
case AUDIO_DATA_FORMAT_TYPE_I_PCM:
TU_VERIFY(audiod_decode_type_I_pcm(rhport, audio, n_bytes_received));
break;
default:
// DESIRED CFG_TUD_AUDIO_FORMAT_TYPE_I_RX NOT IMPLEMENTED!
TU_LOG2(" Desired CFG_TUD_AUDIO_FORMAT_TYPE_I_RX encoding not implemented!\r\n");
TU_BREAKPOINT();
break;
}
break;
default:
// Desired CFG_TUD_AUDIO_FORMAT_TYPE_RX not implemented!
TU_LOG2(" Desired CFG_TUD_AUDIO_FORMAT_TYPE_RX not implemented!\r\n");
TU_BREAKPOINT();
break;
}
// Prepare for next transmission
TU_VERIFY(usbd_edpt_xfer(rhport, audio->ep_out, audio->lin_buf_out, audio->ep_out_sz), false);
#else
#if USE_LINEAR_BUFFER_RX
// Data currently is in linear buffer, copy into EP OUT FIFO
TU_VERIFY(tu_fifo_write_n(&audio->ep_out_ff, audio->lin_buf_out, n_bytes_received));
// Schedule for next receive
TU_VERIFY(usbd_edpt_xfer(rhport, audio->ep_out, audio->lin_buf_out, audio->ep_out_sz), false);
#else
// Data is already placed in EP FIFO, schedule for next receive
TU_VERIFY(usbd_edpt_xfer_fifo(rhport, audio->ep_out, &audio->ep_out_ff, audio->ep_out_sz), false);
#endif
#endif
// Call a weak callback here - a possibility for user to get informed decoding was completed
if (tud_audio_rx_done_post_read_cb)
{
TU_VERIFY(tud_audio_rx_done_post_read_cb(rhport, n_bytes_received, idx_audio_fct, audio->ep_out, audio->alt_setting[idxItf]));
}
return true;
}
#endif //CFG_TUD_AUDIO_ENABLE_EP_OUT
// The following functions are used in case CFG_TUD_AUDIO_ENABLE_DECODING != 0
#if CFG_TUD_AUDIO_ENABLE_DECODING && CFG_TUD_AUDIO_ENABLE_EP_OUT
// Decoding according to 2.3.1.5 Audio Streams
// Helper function
static inline void * audiod_interleaved_copy_bytes_fast_decode(uint16_t const nBytesPerSample, void * dst, const void * dst_end, void * src, uint8_t const n_ff_used)
{
// Due to one FIFO contains 2 channels, data always aligned to (nBytesPerSample * 2)
uint16_t * dst16 = dst;
uint16_t * src16 = src;
const uint16_t * dst_end16 = dst_end;
uint32_t * dst32 = dst;
uint32_t * src32 = src;
const uint32_t * dst_end32 = dst_end;
if (nBytesPerSample == 1)
{
while(dst16 < dst_end16)
{
*dst16++ = *src16++;
src16 += n_ff_used - 1;
}
return src16;
}
else if (nBytesPerSample == 2)
{
while(dst32 < dst_end32)
{
*dst32++ = *src32++;
src32 += n_ff_used - 1;
}
return src32;
}
else if (nBytesPerSample == 3)
{
while(dst16 < dst_end16)
{
*dst16++ = *src16++;
*dst16++ = *src16++;
*dst16++ = *src16++;
src16 += 3 * (n_ff_used - 1);
}
return src16;
}
else // nBytesPerSample == 4
{
while(dst32 < dst_end32)
{
*dst32++ = *src32++;
*dst32++ = *src32++;
src32 += 2 * (n_ff_used - 1);
}
return src32;
}
}
static bool audiod_decode_type_I_pcm(uint8_t rhport, audiod_function_t* audio, uint16_t n_bytes_received)
{
(void) rhport;
// Determine amount of samples
uint8_t const n_ff_used = audio->n_ff_used_rx;
uint16_t const nBytesPerFFToRead = n_bytes_received / n_ff_used;
uint8_t cnt_ff;
// Decode
uint8_t * src;
uint8_t * dst_end;
tu_fifo_buffer_info_t info;
for (cnt_ff = 0; cnt_ff < n_ff_used; cnt_ff++)
{
tu_fifo_get_write_info(&audio->rx_supp_ff[cnt_ff], &info);
if (info.len_lin != 0)
{
info.len_lin = tu_min16(nBytesPerFFToRead, info.len_lin);
src = &audio->lin_buf_out[cnt_ff*audio->n_channels_per_ff_rx * audio->n_bytes_per_sampe_rx];
dst_end = info.ptr_lin + info.len_lin;
src = audiod_interleaved_copy_bytes_fast_decode(audio->n_bytes_per_sampe_rx, info.ptr_lin, dst_end, src, n_ff_used);
// Handle wrapped part of FIFO
info.len_wrap = tu_min16(nBytesPerFFToRead - info.len_lin, info.len_wrap);
if (info.len_wrap != 0)
{
dst_end = info.ptr_wrap + info.len_wrap;
audiod_interleaved_copy_bytes_fast_decode(audio->n_bytes_per_sampe_rx, info.ptr_wrap, dst_end, src, n_ff_used);
}
tu_fifo_advance_write_pointer(&audio->rx_supp_ff[cnt_ff], info.len_lin + info.len_wrap);
}
}
// Number of bytes should be a multiple of CFG_TUD_AUDIO_N_BYTES_PER_SAMPLE_RX * CFG_TUD_AUDIO_N_CHANNELS_RX but checking makes no sense - no way to correct it
// TU_VERIFY(cnt != n_bytes);
return true;
}
#endif //CFG_TUD_AUDIO_ENABLE_DECODING
//--------------------------------------------------------------------+
// WRITE API
//--------------------------------------------------------------------+
#if CFG_TUD_AUDIO_ENABLE_EP_IN && !CFG_TUD_AUDIO_ENABLE_ENCODING
/**
* \brief Write data to EP in buffer
*
* Write data to buffer. If it is full, new data can be inserted once a transmit was scheduled. See audiod_tx_done_cb().
* If TX FIFOs are used, this function is not available in order to not let the user mess up the encoding process.
*
* \param[in] func_id: Index of audio function interface
* \param[in] data: Pointer to data array to be copied from
* \param[in] len: # of array elements to copy
* \return Number of bytes actually written
*/
uint16_t tud_audio_n_write(uint8_t func_id, const void * data, uint16_t len)
{
TU_VERIFY(func_id < CFG_TUD_AUDIO && _audiod_fct[func_id].p_desc != NULL);
return tu_fifo_write_n(&_audiod_fct[func_id].ep_in_ff, data, len);
}
bool tud_audio_n_clear_ep_in_ff(uint8_t func_id) // Delete all content in the EP IN FIFO
{
TU_VERIFY(func_id < CFG_TUD_AUDIO && _audiod_fct[func_id].p_desc != NULL);
return tu_fifo_clear(&_audiod_fct[func_id].ep_in_ff);
}
tu_fifo_t* tud_audio_n_get_ep_in_ff(uint8_t func_id)
{
if(func_id < CFG_TUD_AUDIO && _audiod_fct[func_id].p_desc != NULL) return &_audiod_fct[func_id].ep_in_ff;
return NULL;
}
#endif
#if CFG_TUD_AUDIO_ENABLE_ENCODING && CFG_TUD_AUDIO_ENABLE_EP_IN
uint16_t tud_audio_n_flush_tx_support_ff(uint8_t func_id) // Force all content in the support TX FIFOs to be written into linear buffer and schedule a transmit
{
TU_VERIFY(func_id < CFG_TUD_AUDIO && _audiod_fct[func_id].p_desc != NULL);
audiod_function_t* audio = &_audiod_fct[func_id];
uint16_t n_bytes_copied = tu_fifo_count(&audio->tx_supp_ff[0]);
TU_VERIFY(audiod_tx_done_cb(audio->rhport, audio));
n_bytes_copied -= tu_fifo_count(&audio->tx_supp_ff[0]);
n_bytes_copied = n_bytes_copied*audio->tx_supp_ff[0].item_size;
return n_bytes_copied;
}
bool tud_audio_n_clear_tx_support_ff(uint8_t func_id, uint8_t ff_idx)
{
TU_VERIFY(func_id < CFG_TUD_AUDIO && _audiod_fct[func_id].p_desc != NULL && ff_idx < _audiod_fct[func_id].n_tx_supp_ff);
return tu_fifo_clear(&_audiod_fct[func_id].tx_supp_ff[ff_idx]);
}
uint16_t tud_audio_n_write_support_ff(uint8_t func_id, uint8_t ff_idx, const void * data, uint16_t len)
{
TU_VERIFY(func_id < CFG_TUD_AUDIO && _audiod_fct[func_id].p_desc != NULL && ff_idx < _audiod_fct[func_id].n_tx_supp_ff);
return tu_fifo_write_n(&_audiod_fct[func_id].tx_supp_ff[ff_idx], data, len);
}
tu_fifo_t* tud_audio_n_get_tx_support_ff(uint8_t func_id, uint8_t ff_idx)
{
if(func_id < CFG_TUD_AUDIO && _audiod_fct[func_id].p_desc != NULL && ff_idx < _audiod_fct[func_id].n_tx_supp_ff) return &_audiod_fct[func_id].tx_supp_ff[ff_idx];
return NULL;
}
#endif
#if CFG_TUD_AUDIO_INT_CTR_EPSIZE_IN
// If no interrupt transmit is pending bytes get written into buffer and a transmit is scheduled - once transmit completed tud_audio_int_ctr_done_cb() is called in inform user
uint16_t tud_audio_int_ctr_n_write(uint8_t func_id, uint8_t const* buffer, uint16_t len)
{
TU_VERIFY(func_id < CFG_TUD_AUDIO && _audiod_fct[func_id].p_desc != NULL);
// We write directly into the EP's buffer - abort if previous transfer not complete
TU_VERIFY(!usbd_edpt_busy(_audiod_fct[func_id].rhport, _audiod_fct[func_id].ep_int_ctr));
TU_VERIFY(tu_memcpy_s(_audiod_fct[func_id].ep_int_ctr_buf, CFG_TUD_AUDIO_INT_CTR_EP_IN_SW_BUFFER_SIZE, buffer, len)==0);
// Schedule transmit
TU_VERIFY(usbd_edpt_xfer(_audiod_fct[func_id].rhport, _audiod_fct[func_id].ep_int_ctr, _audiod_fct[func_id].ep_int_ctr_buf, len));
return true;
}
#endif
// This function is called once a transmit of an audio packet was successfully completed. Here, we encode samples and place it in IN EP's buffer for next transmission.
// If you prefer your own (more efficient) implementation suiting your purpose set CFG_TUD_AUDIO_ENABLE_ENCODING = 0 and use tud_audio_n_write.
// n_bytes_copied - Informs caller how many bytes were loaded. In case n_bytes_copied = 0, a ZLP is scheduled to inform host no data is available for current frame.
#if CFG_TUD_AUDIO_ENABLE_EP_IN
static bool audiod_tx_done_cb(uint8_t rhport, audiod_function_t * audio)
{
uint8_t idxItf;
uint8_t const *dummy2;
uint8_t idx_audio_fct = audiod_get_audio_fct_idx(audio);
TU_VERIFY(audiod_get_AS_interface_index(audio->ep_in_as_intf_num, audio, &idxItf, &dummy2));
// Only send something if current alternate interface is not 0 as in this case nothing is to be sent due to UAC2 specifications
if (audio->alt_setting[idxItf] == 0) return false;
// Call a weak callback here - a possibility for user to get informed former TX was completed and data gets now loaded into EP in buffer (in case FIFOs are used) or
// if no FIFOs are used the user may use this call back to load its data into the EP IN buffer by use of tud_audio_n_write_ep_in_buffer().
if (tud_audio_tx_done_pre_load_cb) TU_VERIFY(tud_audio_tx_done_pre_load_cb(rhport, idx_audio_fct, audio->ep_in, audio->alt_setting[idxItf]));
// Send everything in ISO EP FIFO
uint16_t n_bytes_tx;
// If support FIFOs are used, encode and schedule transmit
#if CFG_TUD_AUDIO_ENABLE_ENCODING && CFG_TUD_AUDIO_ENABLE_EP_IN
switch (audio->format_type_tx)
{
case AUDIO_FORMAT_TYPE_UNDEFINED:
// INDIVIDUAL ENCODING PROCEDURE REQUIRED HERE!
TU_LOG2(" Desired CFG_TUD_AUDIO_FORMAT encoding not implemented!\r\n");
TU_BREAKPOINT();
n_bytes_tx = 0;
break;
case AUDIO_FORMAT_TYPE_I:
switch (audio->format_type_I_tx)
{
case AUDIO_DATA_FORMAT_TYPE_I_PCM:
n_bytes_tx = audiod_encode_type_I_pcm(rhport, audio);
break;
default:
// YOUR ENCODING IS REQUIRED HERE!
TU_LOG2(" Desired CFG_TUD_AUDIO_FORMAT_TYPE_I_TX encoding not implemented!\r\n");
TU_BREAKPOINT();
n_bytes_tx = 0;
break;
}
break;
default:
// Desired CFG_TUD_AUDIO_FORMAT_TYPE_TX not implemented!
TU_LOG2(" Desired CFG_TUD_AUDIO_FORMAT_TYPE_TX not implemented!\r\n");
TU_BREAKPOINT();
n_bytes_tx = 0;
break;
}
TU_VERIFY(usbd_edpt_xfer(rhport, audio->ep_in, audio->lin_buf_in, n_bytes_tx));
#else
// No support FIFOs, if no linear buffer required schedule transmit, else put data into linear buffer and schedule
#if CFG_TUD_AUDIO_EP_IN_FLOW_CONTROL
// packet_sz_tx is based on total packet size, here we want size for each support buffer.
n_bytes_tx = audiod_tx_packet_size(audio->packet_sz_tx, tu_fifo_count(&audio->ep_in_ff), audio->ep_in_ff.depth, audio->ep_in_sz);
#else
n_bytes_tx = tu_min16(tu_fifo_count(&audio->ep_in_ff), audio->ep_in_sz); // Limit up to max packet size, more can not be done for ISO
#endif
#if USE_LINEAR_BUFFER_TX
tu_fifo_read_n(&audio->ep_in_ff, audio->lin_buf_in, n_bytes_tx);
TU_VERIFY(usbd_edpt_xfer(rhport, audio->ep_in, audio->lin_buf_in, n_bytes_tx));
#else
// Send everything in ISO EP FIFO
TU_VERIFY(usbd_edpt_xfer_fifo(rhport, audio->ep_in, &audio->ep_in_ff, n_bytes_tx));
#endif
#endif
// Call a weak callback here - a possibility for user to get informed former TX was completed and how many bytes were loaded for the next frame
if (tud_audio_tx_done_post_load_cb) TU_VERIFY(tud_audio_tx_done_post_load_cb(rhport, n_bytes_tx, idx_audio_fct, audio->ep_in, audio->alt_setting[idxItf]));
return true;
}
#endif //CFG_TUD_AUDIO_ENABLE_EP_IN
#if CFG_TUD_AUDIO_ENABLE_ENCODING && CFG_TUD_AUDIO_ENABLE_EP_IN
// Take samples from the support buffer and encode them into the IN EP software FIFO
// Returns number of bytes written into linear buffer
/* 2.3.1.7.1 PCM Format
The PCM (Pulse Coded Modulation) format is the most commonly used audio format to represent audio
data streams. The audio data is not compressed and uses a signed two’s-complement fixed point format. It
is left-justified (the sign bit is the Msb) and data is padded with trailing zeros to fill the remaining unused
bits of the subslot. The binary point is located to the right of the sign bit so that all values lie within the
range [-1, +1)
*/
/*
* This function encodes channels saved within the support FIFOs into one stream by interleaving the PCM samples
* in the support FIFOs according to 2.3.1.5 Audio Streams. It does not control justification (left or right) and
* does not change the number of bytes per sample.
* */
// Helper function
static inline void * audiod_interleaved_copy_bytes_fast_encode(uint16_t const nBytesPerSample, void * src, const void * src_end, void * dst, uint8_t const n_ff_used)
{
// Due to one FIFO contains 2 channels, data always aligned to (nBytesPerSample * 2)
uint16_t * dst16 = dst;
uint16_t * src16 = src;
const uint16_t * src_end16 = src_end;
uint32_t * dst32 = dst;
uint32_t * src32 = src;
const uint32_t * src_end32 = src_end;
if (nBytesPerSample == 1)
{
while(src16 < src_end16)
{
*dst16++ = *src16++;
dst16 += n_ff_used - 1;
}
return dst16;
}
else if (nBytesPerSample == 2)
{
while(src32 < src_end32)
{
*dst32++ = *src32++;
dst32 += n_ff_used - 1;
}
return dst32;
}
else if (nBytesPerSample == 3)
{
while(src16 < src_end16)
{
*dst16++ = *src16++;
*dst16++ = *src16++;
*dst16++ = *src16++;
dst16 += 3 * (n_ff_used - 1);
}
return dst16;
}
else // nBytesPerSample == 4
{
while(src32 < src_end32)
{
*dst32++ = *src32++;
*dst32++ = *src32++;
dst32 += 2 * (n_ff_used - 1);