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webcam: 5 works

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This commit is contained in:
Thomas Farstrike
2025-05-13 17:50:19 +02:00
parent d57aa554d1
commit 78aa4af7cc
1 changed files with 23 additions and 15 deletions
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c_mpos/src/webcam.c
+23 -15
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@@ -23,7 +23,9 @@
#define CAPTURE_HEIGHT 480
#define OUTPUT_WIDTH 240 // Resize to 240x240
#define OUTPUT_HEIGHT 240
#define NUM_BUFFERS 2 // Use 2 buffers, as it worked for two captures
#define NUM_BUFFERS 5 // Use 2 buffers, as it worked for two captures
#define QUEUE_RETRIES 5 // Number of retry attempts for queueing
#define QUEUE_RETRY_DELAY_US 100000 // 50ms delay between retries
// Webcam object type
typedef struct _webcam_obj_t {
@@ -72,27 +74,33 @@ static void resize_640x480_to_240x240(uint8_t *src, uint8_t *dst) {
static mp_obj_t webcam_capture_grayscale(mp_obj_t self_in) {
webcam_obj_t *self = MP_OBJ_TO_PTR(self_in);
// Try to queue a buffer
// Try to queue a buffer with retries
struct v4l2_buffer buf = {0};
bool queued = false;
for (size_t i = 0; i < self->num_buffers; i++) {
memset(&buf, 0, sizeof(buf));
buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
buf.memory = V4L2_MEMORY_MMAP;
buf.index = i;
for (int attempt = 0; attempt < QUEUE_RETRIES && !queued; attempt++) {
for (size_t i = 0; i < self->num_buffers; i++) {
memset(&buf, 0, sizeof(buf));
buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
buf.memory = V4L2_MEMORY_MMAP;
buf.index = i;
WEBCAM_DEBUG_PRINT("webcam: Attempting to queue buffer (index=%zu)\n", i);
if (ioctl(self->fd, VIDIOC_QBUF, &buf) == 0) {
WEBCAM_DEBUG_PRINT("webcam: Successfully queued buffer (index=%zu)\n", i);
queued = true;
break;
WEBCAM_DEBUG_PRINT("webcam: Attempting to queue buffer (index=%zu, attempt=%d)\n", i, attempt + 1);
if (ioctl(self->fd, VIDIOC_QBUF, &buf) == 0) {
WEBCAM_DEBUG_PRINT("webcam: Successfully queued buffer (index=%zu)\n", i);
queued = true;
break;
}
WEBCAM_DEBUG_PRINT("webcam: Failed to queue buffer (index=%zu, errno=%d)\n", i, errno);
}
if (!queued && attempt < QUEUE_RETRIES - 1) {
WEBCAM_DEBUG_PRINT("webcam: No buffers available, retrying after delay\n");
usleep(QUEUE_RETRY_DELAY_US); // Wait 50ms before retrying
}
WEBCAM_DEBUG_PRINT("webcam: Failed to queue buffer (index=%zu, errno=%d)\n", i, errno);
}
if (!queued) {
WEBCAM_DEBUG_PRINT("webcam: No buffers available for queuing\n");
mp_raise_OSError(EAGAIN); // Try again later
WEBCAM_DEBUG_PRINT("webcam: No buffers available after %d retries\n", QUEUE_RETRIES);
mp_raise_OSError(EAGAIN);
}
// Start streaming if not already started