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Disable feedback format correction by default #1234

This commit is contained in:
Valentin Milea 2022-01-07 15:02:52 +02:00
parent ef879e8a8a
commit a284e438f1
2 changed files with 13 additions and 15 deletions
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6
src/class/audio/audio_device.c
View File

@ -2247,14 +2247,12 @@ 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
// unless format correction is disabled.
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 && !CFG_TUD_AUDIO_DISABLE_FEEDBACK_FORMAT_CORRECTION
#if CFG_TUD_AUDIO_ENABLE_FEEDBACK_FORMAT_CORRECTION && !TUD_OPT_HIGH_SPEED
uint8_t * fb = (uint8_t *) &_audiod_fct[func_id].fb_val;
// For FS format is 10.14
@ -2264,7 +2262,7 @@ bool tud_audio_n_fb_set(uint8_t func_id, uint32_t feedback)
// 4th byte is needed to work correctly with MS Windows
*fb = 0;
#else
// For HS format is 16.16 as originally demanded
// Send value as-is, caller will choose the appropriate format
_audiod_fct[func_id].fb_val = feedback;
#endif

22
src/class/audio/audio_device.h
View File

@ -186,9 +186,9 @@
#define CFG_TUD_AUDIO_ENABLE_FEEDBACK_EP 0 // Feedback - 0 or 1
#endif
// Disable/enable conversion from 16.16 to 10.14 format on high-speed devices. See tud_audio_n_fb_set().
#ifndef CFG_TUD_AUDIO_DISABLE_FEEDBACK_FORMAT_CORRECTION
#define CFG_TUD_AUDIO_DISABLE_FEEDBACK_FORMAT_CORRECTION 0 // 0 or 1
// 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
@ -459,15 +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.
//
// Note that the USB Audio 2.0 driver on Windows 10 is not following the spec and expects 16.16
// format for FS. You can define CFG_TUD_AUDIO_DISABLE_FEEDBACK_FORMAT_CORRECTION=1 as a workaround
// to transmit the feedback value unchanged. Be aware that this might break feedback on other hosts,
// though at least on Linux the ALSA driver will happily accept either format.
// 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