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Video Class: New callback function added which allows to generate frame data on the fly

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- If buffer is set to NULL, the callback will request payload data from a user function. This allows to work with dynamic content on platforms which are not able to hold a whole frame in memory.
- Callback uses the same "weak" linking as other callbacks for this class.
This commit is contained in:
Tobi
2025-10-30 12:21:21 +01:00
parent fc3857eb1a
commit 032de0b0df
2 changed files with 25 additions and 3 deletions
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18
src/class/video/video_device.c
View File

@ -214,6 +214,14 @@ TU_ATTR_WEAK int tud_video_commit_cb(uint_fast8_t ctl_idx, uint_fast8_t stm_idx,
return VIDEO_ERROR_NONE;
}
TU_ATTR_WEAK void tud_video_prepare_payload_cb(uint_fast8_t ctl_idx, uint_fast8_t stm_idx, void* payload_buf, size_t payload_size, size_t offset) {
(void) ctl_idx;
(void) stm_idx;
(void) payload_buf;
(void) payload_size;
(void) offset;
}
//--------------------------------------------------------------------+
//
//--------------------------------------------------------------------+
@ -860,7 +868,11 @@ static uint_fast16_t _prepare_in_payload(videod_streaming_interface_t *stm, uint
}
TU_ASSERT(pkt_len >= hdr_len);
uint_fast16_t data_len = pkt_len - hdr_len;
memcpy(&ep_buf[hdr_len], stm->buffer + stm->offset, data_len);
if (stm->buffer) {
memcpy(&ep_buf[hdr_len], stm->buffer + stm->offset, data_len);
} else {
tud_video_prepare_payload_cb(stm->index_vc, stm->index_vs, &ep_buf[hdr_len], data_len, stm->offset);
}
stm->offset += data_len;
remaining -= data_len;
if (!remaining) {
@ -1235,11 +1247,11 @@ bool tud_video_n_frame_xfer(uint_fast8_t ctl_idx, uint_fast8_t stm_idx, void *bu
TU_ASSERT(ctl_idx < CFG_TUD_VIDEO);
TU_ASSERT(stm_idx < CFG_TUD_VIDEO_STREAMING);
if (!buffer || !bufsize) return false;
if (!bufsize) return false;
videod_streaming_interface_t *stm = _get_instance_streaming(ctl_idx, stm_idx);
videod_streaming_epbuf_t *stm_epbuf = &_videod_streaming_epbuf[ctl_idx];
if (!stm || !stm->desc.ep[0] || stm->buffer) return false;
if (!stm || !stm->desc.ep[0] || stm->bufsize) return false;
if (stm->state == VS_STATE_PROBING) return false;
/* Find EP address */

10
src/class/video/video_device.h
View File

@ -83,6 +83,16 @@ int tud_video_power_mode_cb(uint_fast8_t ctl_idx, uint8_t power_mod);
int tud_video_commit_cb(uint_fast8_t ctl_idx, uint_fast8_t stm_idx,
video_probe_and_commit_control_t const *parameters);
/** Invoked if buffer is set to NULL (allows bufferless on the fly data generation)
*
* @param[in] ctl_idx Destination control interface index
* @param[in] stm_idx Destination streaming interface index
* @param[out] payload_buf Payload storage buffer (target buffer for requested data)
* @param[in] payload_size Size of payload_buf (requested data size)
* @param[in] offset Current byte offset relative to given bufsize from tud_video_n_frame_xfer (framesize)
* @return video_error_code_t */
void tud_video_prepare_payload_cb(uint_fast8_t ctl_idx, uint_fast8_t stm_idx, void* payload_buf, size_t payload_size, size_t offset);
//--------------------------------------------------------------------+
// INTERNAL USBD-CLASS DRIVER API
//--------------------------------------------------------------------+