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videolevels: add auto adjust mode and fix calculations

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This commit is contained in:
Joshua M. Doe 2010-04-14 07:26:55 -04:00
parent fdfc42a3b5
commit 9257139bca
2 changed files with 284 additions and 102 deletions
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373
gst/gstvideolevels.c
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@ -58,14 +58,27 @@ enum
PROP_LOWIN, PROP_LOWIN,
PROP_HIGHIN, PROP_HIGHIN,
PROP_LOWOUT, PROP_LOWOUT,
PROP_HIGHOUT PROP_HIGHOUT,
/* FILL ME */ PROP_AUTO,
PROP_INTERVAL/*,
PROP_NPIXSAT_LOW,
PROP_NPIXSAT_HIGH,
PROP_ROI_X,
PROP_ROI_Y,
PROP_ROI_WIDTH,
PROP_ROI_HEIGHT */
}; };
#define DEFAULT_PROP_LOWIN 0.0 #define DEFAULT_PROP_LOWIN 0.0
#define DEFAULT_PROP_HIGHIN 1.0 #define DEFAULT_PROP_HIGHIN 1.0
#define DEFAULT_PROP_LOWOUT 0.0 #define DEFAULT_PROP_LOWOUT 0.0
#define DEFAULT_PROP_HIGHOUT 1.0 #define DEFAULT_PROP_HIGHOUT 1.0
#define DEFAULT_PROP_AUTO 0
#define DEFAULT_PROP_INTERVAL (GST_SECOND / 2)
#define DEFAULT_PROP_ROW_X 0
#define DEFAULT_PROP_ROW_Y 0
#define DEFAULT_PROP_ROW_WIDTH 0
#define DEFAULT_PROP_ROW_HEIGHT 0
static const GstElementDetails videolevels_details = static const GstElementDetails videolevels_details =
GST_ELEMENT_DETAILS ("Video videolevels adjustment", GST_ELEMENT_DETAILS ("Video videolevels adjustment",
@ -136,6 +149,10 @@ static void gst_videolevels_reset(GstVideoLevels* filter);
static void gst_videolevels_calculate_tables (GstVideoLevels * videolevels); static void gst_videolevels_calculate_tables (GstVideoLevels * videolevels);
static gboolean gst_videolevels_do_levels (GstVideoLevels * videolevels, static gboolean gst_videolevels_do_levels (GstVideoLevels * videolevels,
gpointer indata, gpointer outdata); gpointer indata, gpointer outdata);
static gboolean gst_videolevels_calculate_histogram (GstVideoLevels * videolevels,
guint16 * data);
static gboolean gst_videolevels_auto_adjust (GstVideoLevels * videolevels,
guint16 * data);
/* setup debug */ /* setup debug */
GST_DEBUG_CATEGORY_STATIC (videolevels_debug); GST_DEBUG_CATEGORY_STATIC (videolevels_debug);
@ -211,16 +228,22 @@ gst_videolevels_class_init (GstVideoLevelsClass * object)
/* Install GObject properties */ /* Install GObject properties */
g_object_class_install_property (obj_class, PROP_LOWIN, g_object_class_install_property (obj_class, PROP_LOWIN,
g_param_spec_double ("low_in", "Lower Input Level", "Lower Input Level", g_param_spec_double ("low_in", "Lower Input Level", "Lower Input Level",
0.0, 1.0, DEFAULT_PROP_LOWIN, G_PARAM_READWRITE)); 0.0, G_MAXUINT16, DEFAULT_PROP_LOWIN, G_PARAM_READWRITE));
g_object_class_install_property (obj_class, PROP_HIGHIN, g_object_class_install_property (obj_class, PROP_HIGHIN,
g_param_spec_double ("upper_in", "Upper Input Level", "Upper Input Level", g_param_spec_double ("upper_in", "Upper Input Level", "Upper Input Level",
0.0, 1.0, DEFAULT_PROP_HIGHIN, G_PARAM_READWRITE)); 0.0, G_MAXUINT16, DEFAULT_PROP_HIGHIN, G_PARAM_READWRITE));
g_object_class_install_property (obj_class, PROP_LOWOUT, g_object_class_install_property (obj_class, PROP_LOWOUT,
g_param_spec_double ("low_out", "Lower Output Level", "Lower Output Level", g_param_spec_double ("low_out", "Lower Output Level", "Lower Output Level",
0.0, 1.0, DEFAULT_PROP_LOWOUT, G_PARAM_READWRITE)); 0.0, G_MAXUINT16, DEFAULT_PROP_LOWOUT, G_PARAM_READWRITE));
g_object_class_install_property (obj_class, PROP_HIGHOUT, g_object_class_install_property (obj_class, PROP_HIGHOUT,
g_param_spec_double ("upper_out", "Upper Output Level", "Upper Output Level", g_param_spec_double ("upper_out", "Upper Output Level", "Upper Output Level",
0.0, 1.0, DEFAULT_PROP_HIGHOUT, G_PARAM_READWRITE)); 0.0, G_MAXUINT16, DEFAULT_PROP_HIGHOUT, G_PARAM_READWRITE));
g_object_class_install_property (obj_class, PROP_AUTO,
g_param_spec_int ("auto", "Auto Adjust", "Auto adjust contrast (0): off, (1): single-shot, (2): continuous",
0, 2, DEFAULT_PROP_AUTO, G_PARAM_READWRITE));
g_object_class_install_property (obj_class, PROP_INTERVAL,
g_param_spec_uint64 ("interval", "Interval", "Interval of time between adjustments (in nanoseconds)",
1, G_MAXUINT64, DEFAULT_PROP_INTERVAL, G_PARAM_READWRITE));
/* Register GstBaseTransform vmethods */ /* Register GstBaseTransform vmethods */
trans_class->transform_caps = GST_DEBUG_FUNCPTR (gst_videolevels_transform_caps); trans_class->transform_caps = GST_DEBUG_FUNCPTR (gst_videolevels_transform_caps);
@ -269,19 +292,25 @@ gst_videolevels_set_property (GObject * object, guint prop_id,
switch (prop_id) { switch (prop_id) {
case PROP_LOWIN: case PROP_LOWIN:
videolevels->lower_input = g_value_get_double (value); videolevels->lower_input = g_value_get_double (value);
gst_videolevels_calculate_tables (videolevels); //gst_videolevels_calculate_tables (videolevels);
break; break;
case PROP_HIGHIN: case PROP_HIGHIN:
videolevels->upper_input = g_value_get_double (value); videolevels->upper_input = g_value_get_double (value);
gst_videolevels_calculate_tables (videolevels); //gst_videolevels_calculate_tables (videolevels);
break; break;
case PROP_LOWOUT: case PROP_LOWOUT:
videolevels->lower_output = g_value_get_double (value); videolevels->lower_output = g_value_get_double (value);
gst_videolevels_calculate_tables (videolevels); //gst_videolevels_calculate_tables (videolevels);
break; break;
case PROP_HIGHOUT: case PROP_HIGHOUT:
videolevels->upper_output = g_value_get_double (value); videolevels->upper_output = g_value_get_double (value);
gst_videolevels_calculate_tables (videolevels); //gst_videolevels_calculate_tables (videolevels);
break;
case PROP_AUTO:
videolevels->auto_adjust = g_value_get_int (value);
break;
case PROP_INTERVAL:
videolevels->interval = g_value_get_uint64 (value);
break; break;
default: default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
@ -318,6 +347,12 @@ gst_videolevels_get_property (GObject * object, guint prop_id, GValue * value,
case PROP_HIGHOUT: case PROP_HIGHOUT:
g_value_set_double (value, videolevels->upper_output); g_value_set_double (value, videolevels->upper_output);
break; break;
case PROP_AUTO:
g_value_set_int (value, videolevels->auto_adjust);
break;
case PROP_INTERVAL:
g_value_set_uint64 (value, videolevels->interval);
break;
default: default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break; break;
@ -343,11 +378,8 @@ gst_videolevels_transform_caps (GstBaseTransform * base,
GstPadDirection direction, GstCaps * caps) GstPadDirection direction, GstCaps * caps)
{ {
GstVideoLevels *videolevels; GstVideoLevels *videolevels;
GstCaps *static_caps;
GstCaps *newcaps; GstCaps *newcaps;
GstStructure *structure; GstStructure *structure;
const GValue * width;
const GValue * height;
videolevels = GST_VIDEOLEVELS (base); videolevels = GST_VIDEOLEVELS (base);
@ -456,8 +488,13 @@ gst_videolevels_set_caps (GstBaseTransform * base, GstCaps * incaps,
levels->stride_in = GST_ROUND_UP_4 (levels->width * levels->depth_in/8); levels->stride_in = GST_ROUND_UP_4 (levels->width * levels->depth_in/8);
levels->stride_out = GST_ROUND_UP_4 (levels->width * levels->depth_out/8); levels->stride_out = GST_ROUND_UP_4 (levels->width * levels->depth_out/8);
levels->lower_input = 0.0;
levels->upper_input = (1 << levels->bpp_in) - 1;
levels->lower_output = 0.0;
levels->upper_output = (1 << levels->bpp_out) - 1;
gst_videolevels_calculate_tables (levels);
//gst_videolevels_calculate_tables (levels);
return res; return res;
} }
@ -514,24 +551,32 @@ static GstFlowReturn
gst_videolevels_transform (GstBaseTransform * base, GstBuffer * inbuf, gst_videolevels_transform (GstBaseTransform * base, GstBuffer * inbuf,
GstBuffer * outbuf) GstBuffer * outbuf)
{ {
GstVideoLevels *filter = GST_VIDEOLEVELS (base); GstVideoLevels *videolevels = GST_VIDEOLEVELS (base);
gpointer input; gpointer input;
gpointer output; gpointer output;
gboolean ret; gboolean ret;
/* /*
* We need to lock our filter params to prevent changing * We need to lock our videolevels params to prevent changing
* caps in the middle of a transformation (nice way to get * caps in the middle of a transformation (nice way to get
* segfaults) * segfaults)
*/ */
GST_OBJECT_LOCK (filter); GST_OBJECT_LOCK (videolevels);
input = GST_BUFFER_DATA (inbuf); input = GST_BUFFER_DATA (inbuf);
output = GST_BUFFER_DATA (outbuf); output = GST_BUFFER_DATA (outbuf);
ret = gst_videolevels_do_levels (filter, input, output); if (videolevels->auto_adjust == 1) {
gst_videolevels_auto_adjust (videolevels, input);
videolevels->auto_adjust = 0;
}
else if (videolevels->auto_adjust == 2) {
gst_videolevels_auto_adjust (videolevels, input);
}
GST_OBJECT_UNLOCK (filter); ret = gst_videolevels_do_levels (videolevels, input, output);
GST_OBJECT_UNLOCK (videolevels);
if (ret) if (ret)
return GST_FLOW_OK; return GST_FLOW_OK;
@ -578,6 +623,17 @@ static void gst_videolevels_reset(GstVideoLevels* videolevels)
g_free (videolevels->lookup_table); g_free (videolevels->lookup_table);
videolevels->lookup_table = NULL; videolevels->lookup_table = NULL;
videolevels->auto_adjust = DEFAULT_PROP_AUTO;
videolevels->interval = DEFAULT_PROP_INTERVAL;
videolevels->lower_pix_sat = 0.01f;
videolevels->upper_pix_sat = 0.01f;
videolevels->nbins = 4096;
g_free (videolevels->histogram);
videolevels->histogram = NULL;
} }
/** /**
@ -590,7 +646,7 @@ static void
gst_videolevels_calculate_tables (GstVideoLevels * videolevels) gst_videolevels_calculate_tables (GstVideoLevels * videolevels)
{ {
gint i; gint i;
guint8 loIn, hiIn; guint16 loIn, hiIn;
guint8 loOut, hiOut; guint8 loOut, hiOut;
gdouble slope; gdouble slope;
guint8 * lut; guint8 * lut;
@ -598,27 +654,102 @@ gst_videolevels_calculate_tables (GstVideoLevels * videolevels)
GST_DEBUG ("calculating lookup table"); GST_DEBUG ("calculating lookup table");
if (!videolevels->lookup_table) { if (!videolevels->lookup_table) {
videolevels->lookup_table = g_malloc (256); videolevels->lookup_table = g_new (guint8, 65536);
} }
lut = (guint8*) videolevels->lookup_table; lut = (guint8*) videolevels->lookup_table;
loIn = (guint8) videolevels->lower_input * 255; loIn = (guint16) (videolevels->lower_input * G_MAXUINT16);
hiIn = (guint8) videolevels->upper_input * 255; hiIn = (guint16) (videolevels->upper_input * G_MAXUINT16);
loOut = (guint8) videolevels->lower_output * 255; loOut = (guint8) (videolevels->lower_output * G_MAXUINT8);
hiOut = (guint8) videolevels->upper_output * 255; hiOut = (guint8) (videolevels->upper_output * G_MAXUINT8);
GST_DEBUG ("input levels (%.3f, %.3f), output levels (%.3f, %.3f)",videolevels->lower_input,videolevels->upper_input,videolevels->lower_output,videolevels->upper_output);
GST_DEBUG ("input levels (%d, %d), output levels (%d, %d)",loIn,hiIn,loOut,hiOut);
if (hiIn == loIn) if (hiIn == loIn)
slope = 0; slope = 0;
else else
slope = (videolevels->upper_output - videolevels->lower_output) / slope = (videolevels->upper_output - videolevels->lower_output) /
(videolevels->upper_input - videolevels->lower_input); (videolevels->upper_input - videolevels->lower_input);
for (i=0; i<loIn; i++) GST_DEBUG ("slope = %f", slope);
if (videolevels->endianness_in == G_BYTE_ORDER) {
for (i = 0; i < loIn; i++)
lut[i] = loOut; lut[i] = loOut;
for (i=loIn; i<hiIn; i++) for (i = loIn; i < hiIn; i++)
lut[i] = loOut + (guint8) ( (i-loIn) * slope); lut[i] = loOut + (guint8) ( (i - loIn) * slope);
for (i=hiIn; i<256; i++) for (i = hiIn; i < 65536; i++)
lut[i] = hiOut; lut[i] = hiOut;
}
else {
for (i = 0; i < loIn; i++)
lut[GUINT16_SWAP_LE_BE(i)] = loOut;
for (i = loIn; i < hiIn; i++)
lut[GUINT16_SWAP_LE_BE(i)] = loOut + (guint8) ((GUINT16_SWAP_LE_BE(i) - loIn) * slope);
for (i = hiIn; i < 65536; i++)
lut[GUINT16_SWAP_LE_BE(i)] = hiOut;
}
for (i = 0; i < 65536; i += 128)
GST_DEBUG ("lut[%d / %d] = %d", i, GUINT16_SWAP_LE_BE(i), lut[i]);
}
#define GINT_CLAMP(x, low, high) ((gint)(CLAMP((x),(low),(high))))
#define GUINT8_CLAMP(x, low, high) ((guint8)(CLAMP((x),(low),(high))))
void
gst_videolevels_convert_uint16le_to_uint8(GstVideoLevels * videolevels,
guint16 * in, guint8 * out)
{
gint i;
const gint size = videolevels->stride_in / 2 * videolevels->height;
gdouble m;
gdouble b;
const guint8 low = (guint8) videolevels->lower_output;
const guint8 high = (guint8) videolevels->upper_output;
GST_DEBUG ("Applying linear mapping (%.3f, %.3f) -> (%.3f, %.3f)",
videolevels->lower_input, videolevels->upper_input,
videolevels->lower_output, videolevels->upper_output);
if (videolevels->lower_input == videolevels->upper_input)
m = 0;
else
m = (videolevels->upper_output - videolevels->lower_output) /
(videolevels->upper_input - videolevels->lower_input);
b = videolevels->lower_output - m * videolevels->lower_input;
for (i = 0; i < size; i++)
out[i] = GUINT8_CLAMP (m * GUINT16_FROM_LE (in[i]) + b, low, high);
}
void
gst_videolevels_convert_uint16be_to_uint8(GstVideoLevels * videolevels,
guint16 * in, guint8 * out)
{
gint i;
const gint size = videolevels->stride_in / 2 * videolevels->height;
gdouble m;
gdouble b;
const guint8 low = (guint8) videolevels->lower_output;
const guint8 high = (guint8) videolevels->upper_output;
GST_DEBUG ("Applying linear mapping (%.3f, %.3f) -> (%.3f, %.3f)",
videolevels->lower_input, videolevels->upper_input,
videolevels->lower_output, videolevels->upper_output);
if (videolevels->lower_input == videolevels->upper_input)
m = 0;
else
m = (videolevels->upper_output - videolevels->lower_output) /
(videolevels->upper_input - videolevels->lower_input);
b = videolevels->lower_output - m * videolevels->lower_input;
for (i = 0; i < size; i++)
out[i] = GUINT8_CLAMP (m * GUINT16_FROM_BE (in[i]) + b, low, high);
} }
/** /**
@ -636,27 +767,72 @@ gboolean
gst_videolevels_do_levels (GstVideoLevels * videolevels, gpointer indata, gst_videolevels_do_levels (GstVideoLevels * videolevels, gpointer indata,
gpointer outdata) gpointer outdata)
{ {
guint8 * dst = outdata; if (videolevels->endianness_in == G_LITTLE_ENDIAN)
guint16 * src = indata; gst_videolevels_convert_uint16le_to_uint8 (videolevels, indata, outdata);
gint r, c; else
guint8 * lut = (guint8 *) videolevels->lookup_table; gst_videolevels_convert_uint16be_to_uint8 (videolevels, indata, outdata);
GST_DEBUG ("Converting frame using LUT"); return TRUE;
//guint8 * dst = outdata;
//guint16 * src = indata;
//gint r = 0, c = 0;
//guint8 * lut = (guint8 *) videolevels->lookup_table;
//GST_DEBUG ("Converting frame using LUT");
//
//for (r = 0; r < videolevels->height; r++) {
// for (c = 0; c < videolevels->width; c++) {
// dst[c+r*videolevels->stride_out] =
// lut[src[c+r*videolevels->stride_in/2]];
// }
//}
return TRUE;
}
/**
* gst_videolevels_calculate_histogram
* @videolevels: #GstVideoLevels
* @data: input frame data
*
* Calculate histogram of input frame
*
* Returns: TRUE on success
*/
gboolean
gst_videolevels_calculate_histogram (GstVideoLevels * videolevels, guint16 * data)
{
gint * hist;
gint nbins = videolevels->nbins;
gint r;
gint c;
gfloat factor = nbins/65536.0f;
if (videolevels->histogram == NULL) {
GST_DEBUG ("First call, allocate memory for histogram (%d bins)", nbins);
videolevels->histogram = g_new (gint, nbins);
}
hist = videolevels->histogram;
/* reset histogram */
memset (hist, 0, sizeof(gint)*nbins);
GST_DEBUG ("Calculating histogram");
if (!videolevels->is_signed_in) { if (!videolevels->is_signed_in) {
if (videolevels->endianness_in == G_BYTE_ORDER) { if (videolevels->endianness_in == G_BYTE_ORDER) {
for (r = 0; r < videolevels->height; r++) { for (r = 0; r < videolevels->height; r++) {
for (c = 0; c < videolevels->width; c++) { for (c = 0; c < videolevels->width; c++) {
dst[c+r*videolevels->stride_out] = /* GST_DEBUG ("(%d, %d) = %d, hist[%d] = %d", r, c, data [c + r * videolevels->stride_in / 2], GINT_CLAMP (data [c + r * videolevels->stride_in / 2] * factor, 0, nbins - 1),
lut[src[c+r*videolevels->stride_in/2] >> 8]; hist [GINT_CLAMP (data [c + r * videolevels->stride_in / 2] * factor, 0, nbins - 1)] + 1);*/
hist [GINT_CLAMP (data [c + r * videolevels->stride_in / 2] * factor, 0, nbins - 1)]++;
} }
} }
} }
else { else {
for (r = 0; r < videolevels->height; r++) { for (r = 0; r < videolevels->height; r++) {
for (c = 0; c < videolevels->width; c++) { for (c = 0; c < videolevels->width; c++) {
dst[c+r*videolevels->stride_out] = hist [GINT_CLAMP (GUINT16_FROM_BE (data [c + r * videolevels->stride_in / 2]) * factor, 0, nbins - 1)]++;
lut[GUINT16_FROM_BE(src[c+r*videolevels->stride_in/2]) >> 8];
} }
} }
} }
@ -665,79 +841,78 @@ gst_videolevels_do_levels (GstVideoLevels * videolevels, gpointer indata,
if (videolevels->endianness_in == G_BYTE_ORDER) { if (videolevels->endianness_in == G_BYTE_ORDER) {
for (r = 0; r < videolevels->height; r++) { for (r = 0; r < videolevels->height; r++) {
for (c = 0; c < videolevels->width; c++) { for (c = 0; c < videolevels->width; c++) {
dst[c+r*videolevels->stride_out] = hist [GINT_CLAMP ((data [c + r * videolevels->stride_in / 2] + 32767) * factor, 0, nbins - 1)]++;
lut[(src[c+r*videolevels->stride_in/2]+32767) >> 8];
} }
GST_DEBUG ("Row %d", r);
} }
} }
else { else {
for (r = 0; r < videolevels->height; r++) { for (r = 0; r < videolevels->height; r++) {
for (c = 0; c < videolevels->width; c++) { for (c = 0; c < videolevels->width; c++) {
dst[c+r*videolevels->stride_out] = hist [GINT_CLAMP ((GUINT16_FROM_BE (data [c + r * videolevels->stride_in / 2]) + 32767) * factor, 0, nbins - 1)]++;
lut[(GUINT16_FROM_BE(src[c+r*videolevels->stride_in/2])+32767) >> 8];
} }
} }
} }
} }
GST_DEBUG ("DONE converting frame using LUT"); //for (r = 0; r < videolevels->nbins; r++ ) {
// GST_DEBUG ("hist[%5d] = %d",r, hist[r]);
return TRUE;
//gdouble loIn = videolevels->lower_input;
//gdouble hiIn = videolevels->upper_input;
//gdouble loOut = videolevels->lower_output;
//gdouble hiOut = videolevels->upper_output;
//gdouble slope;
//gdouble yintercept;
//guint32 dst_max;
//guint32 src_max;
//
///* y=mx+b */
///* check for division by zero */
//if (hiIn == loIn)
// slope=0;
//else
// slope = (hiOut-loOut)/(hiIn-loIn);
//yintercept = loOut - slope*loIn;
//src_max = (1 << videolevels->bpp_in) - 1;
//dst_max = (1 << videolevels->bpp_out) - 1;
/* TODO doesn't handle byte ordering */
//if (videolevels->depth_in == 32 && videolevels->depth_out == 32) {
// guint32 * src = indata;
// guint32 * dst = outdata;
// gint r;
// gint c;
// guint32 b = dst_max * yintercept;
// gdouble m = slope*dst_max/src_max;
// for (r = 0; r < videolevels->height; r++) {
// for (c = 0; c < videolevels->width; c++) {
// dst[c+r*videolevels->stride_out] = m*src[c+r*videolevels->stride_in] + b;
// }
// }
//} //}
//else if (videolevels->depth_in == 16 && videolevels->depth_out == 8) {
// guint16 * src = indata;
// guint8 * dst = outdata;
// gint r;
// gint c;
// guint8 b = dst_max * yintercept;
// gdouble m = slope*dst_max/src_max;
return TRUE;
// for (r = 0; r < videolevels->height; r++) { }
// for (c = 0; c < videolevels->width; c++) {
// dst[c+r*videolevels->stride_out] = m*src[c+r*videolevels->stride_in] + b; /**
// } * gst_videolevels_auto_adjust
// } * @videolevels: #GstVideoLevels
//} * @data: input frame data
//else { *
// return FALSE; * Calculate lower and upper levels based on the histogram of the frame
//} *
* Returns: TRUE on success
*/
gboolean
gst_videolevels_auto_adjust (GstVideoLevels * videolevels,
guint16 * data)
{
guint npixsat;
guint sum;
gint i;
gint size;
gdouble min = 0.0;
gdouble max = (1 << videolevels->bpp_in) - 1.0;
gst_videolevels_calculate_histogram (videolevels, data);
size = videolevels->width * videolevels->height;
/* pixels to saturate on low end */
npixsat = (guint)(videolevels->lower_pix_sat * size);
sum = 0;
for (i = 0; i < videolevels->nbins; i++) {
sum += videolevels->histogram[i];
if (sum > npixsat) {
videolevels->lower_input =
CLAMP (i / (gdouble)videolevels->nbins * max, min, max);
break;
}
}
/* pixels to saturate on high end */
npixsat = (guint)(videolevels->upper_pix_sat * size);
sum = 0;
for (i = videolevels->nbins - 1; i >= 0; i--) {
sum += videolevels->histogram[i];
if (sum > npixsat) {
videolevels->upper_input =
CLAMP ((i + 1) / (gdouble)videolevels->nbins * max, min, max);
break;
}
}
GST_DEBUG ("Contrast stretch with npixsat=%d, (%.3f, %.3f)", npixsat,
videolevels->lower_input, videolevels->upper_input);
//gst_videolevels_calculate_tables (videolevels);
return TRUE; return TRUE;
} }

7
gst/gstvideolevels.h
View File

@ -68,6 +68,13 @@ struct _GstVideoLevels
/* tables */ /* tables */
guint8* levels_table; guint8* levels_table;
gint auto_adjust;
guint64 interval;
gfloat lower_pix_sat;
gfloat upper_pix_sat;
gint nbins;
gint * histogram;
}; };
struct _GstVideoLevelsClass struct _GstVideoLevelsClass