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Change frame buffer management

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This commit is contained in:
kkitayam
2021-09-25 20:49:04 +09:00
parent d88cc23ca5
commit 0d6496886c
2 changed files with 17 additions and 12 deletions
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25
examples/device/video_capture/src/main.c
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@@ -109,30 +109,35 @@ void tud_resume_cb(void)
static unsigned char const *frames[] = {
black_128x96_yuv, white_128x96_yuv, green_128x96_yuv
};
uint8_t current_frame = 0;
static unsigned current_frame = 0;
static unsigned tx_busy = 0;
void video_task(void)
{
static unsigned start_ms = 0;
static unsigned interval_ms = 66;
static unsigned interval_ms = 100;
static unsigned frame_num = 0;
static unsigned already_sent = 0;
if (!tud_video_n_streaming(0)) return;
if (!tud_video_n_streaming(0)) {
already_sent = 0;
current_frame = 0;
return;
}
if (!already_sent) {
tud_video_n_frame_xfer(0, 0, (void*)frames[current_frame], 128 * 96 * 12/8);
++current_frame;
if (current_frame == sizeof(frames)/sizeof(frames[0]))
current_frame = 0;
already_sent = 1;
start_ms = board_millis();
tud_video_n_frame_xfer(0, 0, (void*)frames[current_frame], 128 * 96 * 12/8);
}
unsigned cur = board_millis();
if (cur - start_ms < interval_ms) return; // not enough time
if (tx_busy) return;
start_ms += interval_ms;
/* flip buffer */
tud_video_n_frame_xfer(0, 0, (void*)frames[current_frame], 128 * 96 * 12/8);
++frame_num;
if (frame_num % 3) {
interval_ms = 66;
@@ -143,8 +148,8 @@ void video_task(void)
int tud_video_frame_xfer_complete_cb(unsigned itf)
{
/* prepare tx */
tud_video_n_frame_xfer(itf, 0, (void*)frames[current_frame], 128 * 96 * 12/8);
tx_busy = 0;
/* flip buffer */
++current_frame;
if (current_frame == sizeof(frames)/sizeof(frames[0]))
current_frame = 0;