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Merge pull request #1235 from vmilea/feature/feedback_format

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Support disabling feedback format correction #1234
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Ha Thach 2022-01-16 12:54:50 +07:00 committed by GitHub
commit 76987fb357
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2 changed files with 29 additions and 15 deletions
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26
src/class/audio/audio_device.c
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@ -2247,24 +2247,28 @@ static void audiod_parse_for_AS_params(audiod_function_t* audio, uint8_t const *
#if CFG_TUD_AUDIO_ENABLE_FEEDBACK_EP
// Input value feedback has to be in 16.16 format - the format will be converted according to speed settings automatically
bool tud_audio_n_fb_set(uint8_t func_id, uint32_t feedback)
{
TU_VERIFY(func_id < CFG_TUD_AUDIO && _audiod_fct[func_id].p_desc != NULL);
// Format the feedback value
#if !TUD_OPT_HIGH_SPEED
uint8_t * fb = (uint8_t *) &_audiod_fct[func_id].fb_val;
#if CFG_TUD_AUDIO_ENABLE_FEEDBACK_FORMAT_CORRECTION
if ( TUSB_SPEED_FULL == tud_speed_get() )
{
uint8_t * fb = (uint8_t *) &_audiod_fct[func_id].fb_val;
// For FS format is 10.14
*(fb++) = (feedback >> 2) & 0xFF;
*(fb++) = (feedback >> 10) & 0xFF;
*(fb++) = (feedback >> 18) & 0xFF;
// 4th byte is needed to work correctly with MS Windows
*fb = 0;
// For FS format is 10.14
*(fb++) = (feedback >> 2) & 0xFF;
*(fb++) = (feedback >> 10) & 0xFF;
*(fb++) = (feedback >> 18) & 0xFF;
// 4th byte is needed to work correctly with MS Windows
*fb = 0;
}else
#else
// For HS format is 16.16 as originally demanded
_audiod_fct[func_id].fb_val = feedback;
{
// Send value as-is, caller will choose the appropriate format
_audiod_fct[func_id].fb_val = feedback;
}
#endif
// Schedule a transmit with the new value if EP is not busy - this triggers repetitive scheduling of the feedback value

18
src/class/audio/audio_device.h
View File

@ -186,6 +186,11 @@
#define CFG_TUD_AUDIO_ENABLE_FEEDBACK_EP 0 // Feedback - 0 or 1
#endif
// Enable/disable conversion from 16.16 to 10.14 format on full-speed devices. See tud_audio_n_fb_set().
#ifndef CFG_TUD_AUDIO_ENABLE_FEEDBACK_FORMAT_CORRECTION
#define CFG_TUD_AUDIO_ENABLE_FEEDBACK_FORMAT_CORRECTION 0 // 0 or 1
#endif
// Audio interrupt control EP size - disabled if 0
#ifndef CFG_TUD_AUDIO_INT_CTR_EPSIZE_IN
#define CFG_TUD_AUDIO_INT_CTR_EPSIZE_IN 0 // Audio interrupt control - if required - 6 Bytes according to UAC 2 specification (p. 74)
@ -454,10 +459,15 @@ TU_ATTR_WEAK bool tud_audio_rx_done_post_read_cb(uint8_t rhport, uint16_t n_byte
#if CFG_TUD_AUDIO_ENABLE_EP_OUT && CFG_TUD_AUDIO_ENABLE_FEEDBACK_EP
TU_ATTR_WEAK bool tud_audio_fb_done_cb(uint8_t rhport);
// User code should call this function with feedback value in 16.16 format for FS and HS.
// Value will be corrected for FS to 10.14 format automatically.
// (see Universal Serial Bus Specification Revision 2.0 5.12.4.2).
// Feedback value will be sent at FB endpoint interval till it's changed.
// This function is used to provide data rate feedback from an asynchronous sink. Feedback value will be sent at FB endpoint interval till it's changed.
//
// The feedback format is specified to be 16.16 for HS and 10.14 for FS devices (see Universal Serial Bus Specification Revision 2.0 5.12.4.2). By default,
// the choice of format is left to the caller and feedback argument is sent as-is. If CFG_TUD_AUDIO_ENABLE_FEEDBACK_FORMAT_CORRECTION is set, then tinyusb
// expects 16.16 format and handles the conversion to 10.14 on FS.
//
// Note that due to a bug in its USB Audio 2.0 driver, Windows currently requires 16.16 format for _all_ USB 2.0 devices. On Linux and macOS it seems the
// driver can work with either format. So a good compromise is to keep format correction disabled and stick to 16.16 format.
bool tud_audio_n_fb_set(uint8_t func_id, uint32_t feedback);
static inline bool tud_audio_fb_set(uint32_t feedback);
#endif