55 #define OFFSET(x) offsetof(GradientsContext, x) 56 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM 102 const float y = 1.f - x;
104 return (
lrintf(c0[0] * y + c1[0] * x)) << 0 |
105 (
lrintf(c0[1] * y + c1[1] * x)) << 8 |
106 (
lrintf(c0[2] * y + c1[2] * x)) << 16 |
107 (
lrintf(c0[3] * y + c1[3] * x)) << 24;
112 const float y = 1.f - x;
114 return (
llrintf((c0[0] * y + c1[0] * x) * 256)) << 0 |
115 (
llrintf((c0[1] * y + c1[1] * x) * 256)) << 16 |
116 (
llrintf((c0[2] * y + c1[2] * x) * 256)) << 32 |
117 (
llrintf((c0[3] * y + c1[3] * x) * 256)) << 48;
125 if (nb_colors == 1 || step <= 0.0) {
126 return arr[0][0] | (arr[0][1] << 8) | (arr[0][2] << 16) | (arr[0][3] << 24);
127 }
else if (step >= 1.0) {
129 return arr[
i][0] | (arr[
i][1] << 8) | (arr[i][2] << 16) | (arr[
i][3] << 24);
132 scl = step * (nb_colors - 1);
135 return lerp_color(arr[i], arr[i + 1], scl - i);
143 if (nb_colors == 1 || step <= 0.0) {
144 return ((uint64_t)arr[0][0] << 8) | ((uint64_t)arr[0][1] << 24) | ((uint64_t)arr[0][2] << 40) | ((uint64_t)arr[0][3] << 56);
145 }
else if (step >= 1.0) {
147 return ((uint64_t)arr[
i][0] << 8) | ((uint64_t)arr[
i][1] << 24) | ((uint64_t)arr[
i][2] << 40) | ((uint64_t)arr[
i][3] << 56);
150 scl = step * (nb_colors - 1);
156 static float project(
float origin_x,
float origin_y,
157 float dest_x,
float dest_y,
158 int point_x,
int point_y)
161 float od_x = dest_x - origin_x;
162 float od_y = dest_y - origin_y;
165 float od_s_q = od_x * od_x + od_y * od_y;
168 float op_x = point_x - origin_x;
169 float op_y = point_y - origin_y;
170 float op_x_od = op_x * od_x + op_y * od_y;
173 return av_clipf(op_x_od / od_s_q, 0.
f, 1.
f);
182 const int start = (height * job ) / nb_jobs;
183 const int end = (height * (job+1)) / nb_jobs;
184 const int linesize = frame->
linesize[0] / 4;
185 uint32_t *dst = (uint32_t *)frame->
data[0] + start * linesize;
187 for (
int y = start; y <
end; y++) {
188 for (
int x = 0; x <
width; x++) {
205 const int start = (height * job ) / nb_jobs;
206 const int end = (height * (job+1)) / nb_jobs;
207 const int linesize = frame->
linesize[0] / 8;
208 uint64_t *dst = (uint64_t *)frame->
data[0] + start * linesize;
210 for (
int y = start; y <
end; y++) {
211 for (
int x = 0; x <
width; x++) {
239 if (s->
x0 < 0 || s->
x0 >= s->
w)
241 if (s->
y0 < 0 || s->
y0 >= s->
h)
243 if (s->
x1 < 0 || s->
x1 >= s->
w)
245 if (s->
y1 < 0 || s->
y1 >= s->
h)
265 const float w2 = s->
w / 2.f;
266 const float h2 = s->
h / 2.f;
305 .priv_class = &gradients_class,
Context structure for the Lagged Fibonacci PRNG.
static int activate(AVFilterContext *ctx)
static __device__ float floorf(float a)
const AVPixFmtDescriptor * av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
static int draw_gradients_slice16(AVFilterContext *ctx, void *arg, int job, int nb_jobs)
This structure describes decoded (raw) audio or video data.
Main libavfilter public API header.
#define AV_PIX_FMT_RGBA64
int h
agreed upon image height
AVFrame * ff_get_video_buffer(AVFilterLink *link, int w, int h)
Request a picture buffer with a specific set of permissions.
static void ff_outlink_set_status(AVFilterLink *link, int status, int64_t pts)
Set the status field of a link from the source filter.
const char * name
Pad name.
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
AVComponentDescriptor comp[4]
Parameters that describe how pixels are packed.
static av_cold int end(AVCodecContext *avctx)
int64_t pts
Presentation timestamp in time_base units (time when frame should be shown to user).
#define AVERROR_EOF
End of file.
int interlaced_frame
The content of the picture is interlaced.
the definition of that something depends on the semantic of the filter The callback must examine the status of the filter s links and proceed accordingly The status of output links is stored in the status_in and status_out fields and tested by the ff_outlink_frame_wanted() function.If this function returns true
A filter pad used for either input or output.
int64_t av_rescale_q(int64_t a, AVRational bq, AVRational cq)
Rescale a 64-bit integer by 2 rational numbers.
A link between two filters.
AVFilter ff_vsrc_gradients
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
void * priv
private data for use by the filter
#define AVFILTER_FLAG_SLICE_THREADS
The filter supports multithreading by splitting frames into multiple parts and processing them concur...
AVRational time_base
Define the time base used by the PTS of the frames/samples which will pass through this link...
static uint32_t lerp_colors(uint8_t arr[3][4], int nb_colors, float step)
int64_t duration
duration expressed in microseconds
packed RGBA 8:8:8:8, 32bpp, RGBARGBA...
static float project(float origin_x, float origin_y, float dest_x, float dest_y, int point_x, int point_y)
int w
agreed upon image width
int av_image_check_size(unsigned int w, unsigned int h, int log_offset, void *log_ctx)
Check if the given dimension of an image is valid, meaning that all bytes of the image can be address...
enum AVPictureType pict_type
Picture type of the frame.
int ff_filter_get_nb_threads(AVFilterContext *ctx)
Get number of threads for current filter instance.
static const AVOption gradients_options[]
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 the filter must be ready for frames arriving randomly on any input any filter with several inputs will most likely require some kind of queuing mechanism It is perfectly acceptable to have a limited queue and to drop frames when the inputs are too unbalanced request_frame For filters that do not use the this method is called when a frame is wanted on an output For a it should directly call filter_frame on the corresponding output For a if there are queued frames already one of these frames should be pushed If the filter should request a frame on one of its repeatedly until at least one frame has been pushed Return or at least make progress towards producing a frame
AVFilterContext * src
source filter
static const AVFilterPad outputs[]
int format
agreed upon media format
static int draw_gradients_slice(AVFilterContext *ctx, void *arg, int job, int nb_jobs)
static uint32_t lerp_color(uint8_t c0[4], uint8_t c1[4], float x)
#define AV_TIME_BASE_Q
Internal time base represented as fractional value.
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...
AVRational sample_aspect_ratio
Sample aspect ratio for the video frame, 0/1 if unknown/unspecified.
static unsigned int av_lfg_get(AVLFG *c)
Get the next random unsigned 32-bit number using an ALFG.
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.
Rational number (pair of numerator and denominator).
offset must point to AVRational
static const int factor[16]
const char * name
Filter name.
av_cold void av_lfg_init(AVLFG *c, unsigned int seed)
AVRational sample_aspect_ratio
agreed upon sample aspect ratio
offset must point to two consecutive integers
AVFilterLink ** outputs
array of pointers to output links
AVFILTER_DEFINE_CLASS(gradients)
static enum AVPixelFormat pix_fmts[]
#define flags(name, subs,...)
AVFilterInternal * internal
An opaque struct for libavfilter internal use.
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
static av_always_inline AVRational av_inv_q(AVRational q)
Invert a rational.
static int config_output(AVFilterLink *inlink)
static uint64_t lerp_colors16(uint8_t arr[3][4], int nb_colors, float step)
avfilter_execute_func * execute
static uint64_t lerp_color16(uint8_t c0[4], uint8_t c1[4], float x)
static const AVFilterPad gradients_outputs[]
int key_frame
1 -> keyframe, 0-> not
int(* draw_slice)(AVFilterContext *ctx, void *arg, int job, int nb_jobs)
static int query_formats(AVFilterContext *ctx)
uint32_t av_get_random_seed(void)
Get a seed to use in conjunction with random functions.
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 depth
Number of bits in the component.
AVPixelFormat
Pixel format.
trying all byte sequences megabyte in length and selecting the best looking sequence will yield cases to try But a word about which is also called distortion Distortion can be quantified by almost any quality measurement one chooses the sum of squared differences is used but more complex methods that consider psychovisual effects can be used as well It makes no difference in this discussion First step