47 #define LCG(x) (((x) * LCG_A + LCG_C) % LCG_M) 48 #define LCG_SEED 739187 69 #define OFFSET(x) offsetof(HisteqContext, x) 70 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM 71 #define CONST(name, help, val, unit) { name, help, 0, AV_OPT_TYPE_CONST, {.i64=val}, INT_MIN, INT_MAX, FLAGS, unit } 90 "strength:%0.3f intensity:%0.3f antibanding:%d\n",
126 #define GET_RGB_VALUES(r, g, b, src, map) do { \ 127 r = src[x + map[R]]; \ 128 g = src[x + map[G]]; \ 129 b = src[x + map[B]]; \ 139 int x, y,
i, luthi, lutlo, lut, luma, oluma, m;
141 unsigned int r,
g,
b, jran;
157 src = inpic->
data[0];
158 dst = outpic->
data[0];
159 for (y = 0; y < inlink->
h; y++) {
160 for (x = 0; x < inlink->
w * histeq->
bpp; x += histeq->
bpp) {
162 luma = (55 * r + 182 * g + 19 *
b) >> 8;
171 for (x = 0; x < 256; x++)
178 for (x = 1; x < 256; x++)
182 for (x = 0; x < 256; x++)
183 histeq->
LUT[x] = (histeq->
LUT[x] * intensity) / (inlink->
h * inlink->
w);
187 for (x = 0; x < 256; x++)
188 histeq->
LUT[x] = (strength * histeq->
LUT[x]) / 255 +
194 src = inpic->
data[0];
195 dst = outpic->
data[0];
196 for (y = 0; y < inlink->
h; y++) {
197 for (x = 0; x < inlink->
w * histeq->
bpp; x += histeq->
bpp) {
200 for (i = 0; i < histeq->
bpp; ++
i)
204 lut = histeq->
LUT[luma];
208 (histeq->
LUT[luma] + histeq->
LUT[luma - 1]) / 2 :
209 histeq->
LUT[luma - 1];
215 (histeq->
LUT[luma] + histeq->
LUT[luma + 1]) / 2 :
216 histeq->
LUT[luma + 1];
220 if (lutlo != luthi) {
222 lut = lutlo + ((luthi - lutlo + 1) * jran) /
LCG_M;
227 if (((m =
FFMAX3(r, g, b)) * lut) / luma > 255) {
232 r = (r * lut) / luma;
233 g = (g * lut) / luma;
234 b = (b * lut) / luma;
247 for (x = 0; x < 256; x++)
281 .priv_class = &histeq_class,
static int filter_frame(AVFilterLink *inlink, AVFrame *inpic)
const AVPixFmtDescriptor * av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
int out_histogram[256]
output histogram
This structure describes decoded (raw) audio or video data.
Main libavfilter public API header.
packed RGB 8:8:8, 24bpp, RGBRGB...
int av_get_bits_per_pixel(const AVPixFmtDescriptor *pixdesc)
Return the number of bits per pixel used by the pixel format described by pixdesc.
int h
agreed upon image height
uint8_t rgba_map[4]
components position
AVFrame * ff_get_video_buffer(AVFilterLink *link, int w, int h)
Request a picture buffer with a specific set of permissions.
static const AVOption histeq_options[]
#define AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC
Some filters support a generic "enable" expression option that can be used to enable or disable a fil...
const char * name
Pad name.
int in_histogram[256]
input histogram
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
packed ABGR 8:8:8:8, 32bpp, ABGRABGR...
#define AV_LOG_VERBOSE
Detailed information.
A filter pad used for either input or output.
A link between two filters.
#define CONST(name, help, val, unit)
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
packed BGRA 8:8:8:8, 32bpp, BGRABGRA...
void * priv
private data for use by the filter
packed ARGB 8:8:8:8, 32bpp, ARGBARGB...
static int config_input(AVFilterLink *inlink)
packed RGBA 8:8:8:8, 32bpp, RGBARGBA...
int w
agreed upon image width
#define GET_RGB_VALUES(r, g, b, src, map)
common internal API header
static const AVFilterPad histeq_outputs[]
packed RGB 8:8:8, 24bpp, BGRBGR...
static const AVFilterPad outputs[]
int format
agreed upon media format
int ff_fill_rgba_map(uint8_t *rgba_map, enum AVPixelFormat pix_fmt)
static av_cold int init(AVFilterContext *ctx)
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Descriptor that unambiguously describes how the bits of a pixel are stored in the up to 4 data planes...
AVFILTER_DEFINE_CLASS(histeq)
these buffered frames must be flushed immediately if a new input produces new the filter must not call request_frame to get more It must just process the frame or queue it The task of requesting more frames is left to the filter s request_frame method or the application If a filter has several inputs
Describe the class of an AVClass context structure.
const char * name
Filter name.
static int query_formats(AVFilterContext *ctx)
AVFilterLink ** outputs
array of pointers to output links
static enum AVPixelFormat pix_fmts[]
int antibanding
HisteqAntibanding.
#define flags(name, subs,...)
static const AVFilterPad histeq_inputs[]
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
The exact code depends on how similar the blocks are and how related they are to the and needs to apply these operations to the correct inlink or outlink if there are several Macros are available to factor that when no extra processing is inlink
common internal and external API header
AVFilterContext * dst
dest filter
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later.That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another.Frame references ownership and permissions
int LUT[256]
lookup table derived from histogram[]
AVPixelFormat
Pixel format.
int av_frame_copy_props(AVFrame *dst, const AVFrame *src)
Copy only "metadata" fields from src to dst.