frame.c

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/*********************************************************************
* Software License Agreement (BSD License)
*
*  Copyright (C) 2010-2012 Ken Tossell
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*
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#include "libuvc.h"
#include "libuvc_internal.h"

uvc_error_t uvc_ensure_frame_size(uvc_frame_t *frame, size_t need_bytes) {
  if (frame->library_owns_data) {
    if (!frame->data || frame->data_bytes != need_bytes) {
      frame->data_bytes = need_bytes;
      frame->data = realloc(frame->data, frame->data_bytes);
    }
    if (!frame->data)
      return UVC_ERROR_NO_MEM;
    return UVC_SUCCESS;
  } else {
    if (!frame->data || frame->data_bytes < need_bytes)
      return UVC_ERROR_NO_MEM;
    return UVC_SUCCESS;
  }
}

uvc_frame_t *uvc_allocate_frame(size_t data_bytes) {
  uvc_frame_t *frame = malloc(sizeof(*frame));

  if (!frame)
    return NULL;

  memset(frame, 0, sizeof(*frame));

  frame->library_owns_data = 1;

  if (data_bytes > 0) {
    frame->data_bytes = data_bytes;
    frame->data = malloc(data_bytes);

    if (!frame->data) {
      free(frame);
      return NULL;
    }
  }

  return frame;
}

void uvc_free_frame(uvc_frame_t *frame) {
  if (frame->data_bytes > 0 && frame->library_owns_data)
    free(frame->data);

  free(frame);
}

static inline unsigned char sat(int i) {
  return (unsigned char)( i >= 255 ? 255 : (i < 0 ? 0 : i));
}

uvc_error_t uvc_duplicate_frame(uvc_frame_t *in, uvc_frame_t *out) {
  if (uvc_ensure_frame_size(out, in->data_bytes) < 0)
    return UVC_ERROR_NO_MEM;

  out->width = in->width;
  out->height = in->height;
  out->fourcc = in->fourcc;
  out->step = in->step;
  out->sequence = in->sequence;
  out->capture_time = in->capture_time;
  out->source = in->source;

  memcpy(out->data, in->data, in->data_bytes);

  return UVC_SUCCESS;
}