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87 s->hsub =
desc->log2_chroma_w;
88 s->vsub =
desc->log2_chroma_h;
97 "filter params: %d.\n",
ret);
101 s->radius[
Y] =
s->luma_param.radius;
102 s->radius[
U] =
s->radius[
V] =
s->chroma_param.radius;
103 s->radius[
A] =
s->alpha_param.radius;
105 s->power[
Y] =
s->luma_param.power;
106 s->power[
U] =
s->power[
V] =
s->chroma_param.power;
107 s->power[
A] =
s->alpha_param.power;
126 #define BLUR(type, depth) \
127 static inline void blur ## depth(type *dst, int dst_step, const type *src, \
128 int src_step, int len, int radius) \
130 const int length = radius*2 + 1; \
131 const int inv = ((1<<16) + length/2)/length; \
132 int x, sum = src[radius*src_step]; \
134 for (x = 0; x < radius; x++) \
135 sum += src[x*src_step]<<1; \
137 sum = sum*inv + (1<<15); \
139 for (x = 0; x <= radius; x++) { \
140 sum += (src[(radius+x)*src_step] - src[(radius-x)*src_step])*inv; \
141 dst[x*dst_step] = sum>>16; \
144 for (; x < len-radius; x++) { \
145 sum += (src[(radius+x)*src_step] - src[(x-radius-1)*src_step])*inv; \
146 dst[x*dst_step] = sum >>16; \
149 for (; x < len; x++) { \
150 sum += (src[(2*len-radius-x-1)*src_step] - src[(x-radius-1)*src_step])*inv; \
151 dst[x*dst_step] = sum>>16; \
160 static inline void blur(uint8_t *
dst,
int dst_step,
const uint8_t *
src,
int src_step,
161 int len,
int radius,
int pixsize)
163 if (pixsize == 1) blur8 (
dst, dst_step ,
src, src_step ,
len, radius);
164 else blur16((uint16_t*)
dst, dst_step>>1, (
const uint16_t*)
src, src_step>>1,
len, radius);
167 static inline void blur_power(uint8_t *
dst,
int dst_step,
const uint8_t *
src,
int src_step,
168 int len,
int radius,
int power, uint8_t *
temp[2],
int pixsize)
172 if (radius &&
power) {
173 blur(
a, pixsize,
src, src_step,
len, radius, pixsize);
176 blur(
b, pixsize,
a, pixsize,
len, radius, pixsize);
180 blur(
dst, dst_step,
a, pixsize,
len, radius, pixsize);
188 *(uint16_t*)(
dst +
i*dst_step) = ((uint16_t*)
a)[
i];
197 *(uint16_t*)(
dst +
i*dst_step) = *(uint16_t*)(
src +
i*src_step);
201 static void hblur(uint8_t *
dst,
int dst_linesize,
const uint8_t *
src,
int src_linesize,
202 int w,
int h,
int radius,
int power, uint8_t *
temp[2],
int pixsize)
206 if (radius == 0 &&
dst ==
src)
209 for (y = 0; y <
h; y++)
214 static void vblur(uint8_t *
dst,
int dst_linesize,
const uint8_t *
src,
int src_linesize,
215 int w,
int h,
int radius,
int power, uint8_t *
temp[2],
int pixsize)
219 if (radius == 0 &&
dst ==
src)
222 for (x = 0; x <
w; x++)
238 const int depth =
desc->comp[0].depth;
239 const int pixsize = (depth+7)/8;
248 for (plane = 0; plane < 4 && in->
data[plane] && in->
linesize[plane]; plane++)
251 w[plane],
h[plane],
s->radius[plane],
s->power[plane],
254 for (plane = 0; plane < 4 && in->
data[plane] && in->
linesize[plane]; plane++)
256 out->data[plane],
out->linesize[plane],
257 w[plane],
h[plane],
s->radius[plane],
s->power[plane],
265 #define OFFSET(x) offsetof(BoxBlurContext, x)
266 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
271 {
"luma_power",
"How many times should the boxblur be applied to luma",
OFFSET(luma_param.power),
AV_OPT_TYPE_INT, {.i64=2}, 0, INT_MAX, .flags =
FLAGS },
272 {
"lp",
"How many times should the boxblur be applied to luma",
OFFSET(luma_param.power),
AV_OPT_TYPE_INT, {.i64=2}, 0, INT_MAX, .flags =
FLAGS },
276 {
"chroma_power",
"How many times should the boxblur be applied to chroma",
OFFSET(chroma_param.power),
AV_OPT_TYPE_INT, {.i64=-1}, -1, INT_MAX, .flags =
FLAGS },
277 {
"cp",
"How many times should the boxblur be applied to chroma",
OFFSET(chroma_param.power),
AV_OPT_TYPE_INT, {.i64=-1}, -1, INT_MAX, .flags =
FLAGS },
281 {
"alpha_power",
"How many times should the boxblur be applied to alpha",
OFFSET(alpha_param.power),
AV_OPT_TYPE_INT, {.i64=-1}, -1, INT_MAX, .flags =
FLAGS },
282 {
"ap",
"How many times should the boxblur be applied to alpha",
OFFSET(alpha_param.power),
AV_OPT_TYPE_INT, {.i64=-1}, -1, INT_MAX, .flags =
FLAGS },
302 .priv_class = &boxblur_class,
AVFrame * ff_get_video_buffer(AVFilterLink *link, int w, int h)
Request a picture buffer with a specific set of permissions.
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 ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
const AVPixFmtDescriptor * av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
static int query_formats(AVFilterContext *ctx)
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
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
static void blur_power(uint8_t *dst, int dst_step, const uint8_t *src, int src_step, int len, int radius, int power, uint8_t *temp[2], int pixsize)
#define FILTER_INPUTS(array)
This structure describes decoded (raw) audio or video data.
static av_cold void uninit(AVFilterContext *ctx)
const char * name
Filter name.
A link between two filters.
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
#define AV_PIX_FMT_FLAG_HWACCEL
Pixel format is an HW accelerated format.
A filter pad used for either input or output.
int ff_boxblur_eval_filter_params(AVFilterLink *inlink, FilterParam *luma_param, FilterParam *chroma_param, FilterParam *alpha_param)
const AVFilter ff_vf_boxblur
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
const AVFilterPad ff_video_default_filterpad[1]
An AVFilterPad array whose only entry has name "default" and is of type AVMEDIA_TYPE_VIDEO.
#define AV_CEIL_RSHIFT(a, b)
#define FILTER_OUTPUTS(array)
static int config_input(AVFilterLink *inlink)
static void hblur(uint8_t *dst, int dst_linesize, const uint8_t *src, int src_linesize, int w, int h, int radius, int power, uint8_t *temp[2], int pixsize)
Describe the class of an AVClass context structure.
static const AVOption boxblur_options[]
int av_frame_copy_props(AVFrame *dst, const AVFrame *src)
Copy only "metadata" fields from src to dst.
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
static void blur(uint8_t *dst, int dst_step, const uint8_t *src, int src_step, int len, int radius, int pixsize)
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
uint8_t ptrdiff_t const uint8_t ptrdiff_t int intptr_t intptr_t int int16_t * dst
uint8_t * temp[2]
temporary buffer used in blur_power()
#define AV_PIX_FMT_FLAG_BITSTREAM
All values of a component are bit-wise packed end to end.
The reader does not expect b to be semantically here and if the code is changed by maybe adding a a division or other the signedness will almost certainly be mistaken To avoid this confusion a new type was SUINT is the C unsigned type but it holds a signed int to use the same example SUINT a
#define AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC
Some filters support a generic "enable" expression option that can be used to enable or disable a fil...
static const AVFilterPad avfilter_vf_boxblur_inputs[]
#define i(width, name, range_min, range_max)
int w
agreed upon image width
#define AV_PIX_FMT_FLAG_BE
Pixel format is big-endian.
const char * name
Pad name.
static float power(float r, float g, float b, float max)
int h
agreed upon image height
@ AV_OPT_TYPE_INT
Underlying C type is int.
#define AV_PIX_FMT_FLAG_PLANAR
At least one pixel component is not in the first data plane.
#define BLUR(type, depth)
Descriptor that unambiguously describes how the bits of a pixel are stored in the up to 4 data planes...
int linesize[AV_NUM_DATA_POINTERS]
For video, a positive or negative value, which is typically indicating the size in bytes of each pict...
static void vblur(uint8_t *dst, int dst_linesize, const uint8_t *src, int src_linesize, int w, int h, int radius, int power, uint8_t *temp[2], int pixsize)
@ AV_OPT_TYPE_STRING
Underlying C type is a uint8_t* that is either NULL or points to a C string allocated with the av_mal...
#define AV_PIX_FMT_FLAG_PAL
Pixel format has a palette in data[1], values are indexes in this palette.
AVFILTER_DEFINE_CLASS(boxblur)
#define FILTER_QUERY_FUNC(func)