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Add camera fps range API.

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Original preview frame rate API assumes the frame rate
is fixed. It does not not work with auto frame rate camera.

Change-Id: I38f7122ac8ec844ffd63558dc0763ffa17b0926a
This commit is contained in:
Wu-cheng Li
2010-08-11 16:48:05 -07:00
parent eba1274978
commit 454630f237
3 changed files with 161 additions and 42 deletions
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129
core/java/android/hardware/Camera.java
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@@ -960,6 +960,7 @@ public class Camera {
private static final String KEY_PREVIEW_SIZE = "preview-size";
private static final String KEY_PREVIEW_FORMAT = "preview-format";
private static final String KEY_PREVIEW_FRAME_RATE = "preview-frame-rate";
private static final String KEY_PREVIEW_FPS_RANGE = "preview-fps-range";
private static final String KEY_PICTURE_SIZE = "picture-size";
private static final String KEY_PICTURE_FORMAT = "picture-format";
private static final String KEY_JPEG_THUMBNAIL_SIZE = "jpeg-thumbnail-size";
@@ -1219,6 +1220,22 @@ public class Camera {
*/
public static final String METERING_MODE_SPOT = "spot";
/**
* The array index of minimum preview fps for use with {@link
* #getPreviewFpsRange(int[])} or {@link
* #getSupportedPreviewFpsRange()}.
* @hide
*/
public static final int PREVIEW_FPS_MIN_INDEX = 0;
/**
* The array index of maximum preview fps for use with {@link
* #getPreviewFpsRange(int[])} or {@link
* #getSupportedPreviewFpsRange()}.
* @hide
*/
public static final int PREVIEW_FPS_MAX_INDEX = 1;
// Formats for setPreviewFormat and setPictureFormat.
private static final String PIXEL_FORMAT_YUV422SP = "yuv422sp";
private static final String PIXEL_FORMAT_YUV420SP = "yuv420sp";
@@ -1481,6 +1498,64 @@ public class Camera {
return splitInt(str);
}
/**
* Sets the maximum and maximum preview fps. This controls the rate of
* preview frames received in {@link #PreviewCallback}. The minimum and
* maximum preview fps must be one of the elements from {@link
* #getSupportedPreviewFpsRange}.
*
* @param min the minimum preview fps (scaled by 1000).
* @param max the maximum preview fps (scaled by 1000).
* @throws RuntimeException if fps range is invalid.
* @see #setPreviewCallbackWithBuffer(Camera.PreviewCallback)
* @see #getSupportedPreviewFpsRange()
* @hide
*/
public void setPreviewFpsRange(int min, int max) {
set(KEY_PREVIEW_FPS_RANGE, "" + min + "," + max);
}
/**
* Returns the current minimum and maximum preview fps. The values are
* one of the elements returned by {@link #getSupportedPreviewFpsRange}.
*
* @return range the minimum and maximum preview fps (scaled by 1000).
* @see #PREVIEW_FPS_MIN_INDEX
* @see #PREVIEW_FPS_MAX_INDEX
* @see #getSupportedPreviewFpsRange()
* @hide
*/
public void getPreviewFpsRange(int[] range) {
if (range == null || range.length != 2) {
throw new IllegalArgumentException(
"range must be an float array with two elements.");
}
splitInt(get(KEY_PREVIEW_FPS_RANGE), range);
}
/**
* Gets the supported preview fps (frame-per-second) ranges. Each range
* contains a minimum fps and maximum fps. If minimum fps equals to
* maximum fps, the camera outputs frames in fixed frame rate. If not,
* the camera outputs frames in auto frame rate. The actual frame rate
* fluctuates between the minimum and the maximum. The values are
* multiplied by 1000 and represented in integers. For example, if frame
* rate is 26.623 frames per second, the value is 26623.
*
* @return a list of supported preview fps ranges. This method returns a
* list with at least one element. Every element is an int array
* of two values - minimum fps and maximum fps. The list is
* sorted from small to large (first by maximum fps and then
* minimum fps).
* @see #PREVIEW_FPS_MIN_INDEX
* @see #PREVIEW_FPS_MAX_INDEX
* @hide
*/
public List<int[]> getSupportedPreviewFpsRange() {
String str = get(KEY_PREVIEW_FPS_RANGE + SUPPORTED_VALUES_SUFFIX);
return splitRange(str);
}
/**
* Sets the image format for preview pictures.
* <p>If this is never called, the default format will be
@@ -2184,10 +2259,7 @@ public class Camera {
throw new IllegalArgumentException(
"output must be an float array with three elements.");
}
List<Float> distances = splitFloat(get(KEY_FOCUS_DISTANCES));
output[0] = distances.get(0);
output[1] = distances.get(1);
output[2] = distances.get(2);
splitFloat(get(KEY_FOCUS_DISTANCES), output);
}
/**
@@ -2255,19 +2327,27 @@ public class Camera {
return substrings;
}
// Splits a comma delimited string to an ArrayList of Float.
// Return null if the passing string is null or the size is 0.
private ArrayList<Float> splitFloat(String str) {
if (str == null) return null;
private void splitInt(String str, int[] output) {
if (str == null) return;
StringTokenizer tokenizer = new StringTokenizer(str, ",");
ArrayList<Float> substrings = new ArrayList<Float>();
int index = 0;
while (tokenizer.hasMoreElements()) {
String token = tokenizer.nextToken();
substrings.add(Float.parseFloat(token));
output[index++] = Integer.parseInt(token);
}
}
// Splits a comma delimited string to an ArrayList of Float.
private void splitFloat(String str, float[] output) {
if (str == null) return;
StringTokenizer tokenizer = new StringTokenizer(str, ",");
int index = 0;
while (tokenizer.hasMoreElements()) {
String token = tokenizer.nextToken();
output[index++] = Float.parseFloat(token);
}
if (substrings.size() == 0) return null;
return substrings;
}
// Returns the value of a float parameter.
@@ -2318,5 +2398,30 @@ public class Camera {
Log.e(TAG, "Invalid size parameter string=" + str);
return null;
}
// Splits a comma delimited string to an ArrayList of int array.
// Example string: "(10000,26623),(10000,30000)". Return null if the
// passing string is null or the size is 0.
private ArrayList<int[]> splitRange(String str) {
if (str == null || str.charAt(0) != '('
|| str.charAt(str.length() - 1) != ')') {
Log.e(TAG, "Invalid range list string=" + str);
return null;
}
ArrayList<int[]> rangeList = new ArrayList<int[]>();
int endIndex, fromIndex = 1;
do {
int[] range = new int[2];
endIndex = str.indexOf("),(", fromIndex);
if (endIndex == -1) endIndex = str.length() - 1;
splitInt(str.substring(fromIndex, endIndex), range);
rangeList.add(range);
fromIndex = endIndex + 3;
} while (endIndex != str.length() - 1);
if (rangeList.size() == 0) return null;
return rangeList;
}
};
}