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114 double var_values[
VARS_NB], res;
126 (
double)
inlink->sample_aspect_ratio.num /
inlink->sample_aspect_ratio.den : 1;
128 var_values[
VAR_HSUB] = 1 <<
s->draw.hsub_max;
129 var_values[
VAR_VSUB] = 1 <<
s->draw.vsub_max;
153 if (adjusted_aspect.
num && adjusted_aspect.
den) {
154 adjusted_aspect =
av_div_q(adjusted_aspect,
inlink->sample_aspect_ratio);
166 s->x = var_values[
VAR_X] = res;
171 s->y = var_values[
VAR_Y] = res;
177 s->x = var_values[
VAR_X] = res;
201 s->rgba_color[0],
s->rgba_color[1],
s->rgba_color[2],
s->rgba_color[3]);
203 if (
s->x < 0 ||
s->y < 0 ||
204 s->w <= 0 ||
s->h <= 0 ||
205 (
unsigned)
s->x + (
unsigned)
inlink->w >
s->w ||
206 (
unsigned)
s->y + (
unsigned)
inlink->h >
s->h) {
208 "Input area %d:%d:%d:%d not within the padded area 0:0:%d:%d or zero-sized\n",
217 "Error when evaluating the expression '%s'\n", expr);
237 if (
s->inlink_w <= 0)
241 w + (
s->w -
s->in_w),
242 h + (
s->h -
s->in_h) + (
s->x > 0));
250 for (plane = 0; plane < 4 &&
frame->data[plane] &&
frame->linesize[plane]; plane++) {
251 int hsub =
s->draw.hsub[plane];
252 int vsub =
s->draw.vsub[plane];
253 frame->data[plane] += (
s->x >>
hsub) *
s->draw.pixelstep[plane] +
254 (
s->y >> vsub) *
frame->linesize[plane];
279 uint8_t *end = start + (
frame->height >> vsub) *
284 ptrdiff_t req_start = (
s->x >>
hsub) *
s->draw.pixelstep[
planes[
i]] +
286 ptrdiff_t req_end = ((
s->w -
s->x -
frame->width) >>
hsub) *
292 if (start - buf->
data < req_start ||
293 (buf->
data + buf->
size) - end < req_end)
297 int vsub1 =
s->draw.vsub[
planes[j]];
299 uint8_t *end1 = start1 + (
frame->height >> vsub1) *
304 if (
FFSIGN(start - end1) !=
FFSIGN(start - end1 - req_start) ||
374 for (
i = 0;
i < 4 &&
out->data[
i] &&
out->linesize[
i];
i++) {
375 int hsub =
s->draw.hsub[
i];
376 int vsub =
s->draw.vsub[
i];
377 out->data[
i] -= (
s->x >>
hsub) *
s->draw.pixelstep[
i] +
378 (
s->y >> vsub) *
out->linesize[
i];
390 if (
s->h >
s->y +
s->in_h) {
393 0,
s->y +
s->in_h,
s->w,
s->h -
s->y -
s->in_h);
408 s->x +
s->in_w,
s->y,
s->w -
s->x -
s->in_w,
419 #define OFFSET(x) offsetof(PadContext, x)
420 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
461 .priv_class = &pad_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
char * w_expr
width expression string
int eval_mode
expression evaluation mode
int y
offsets of the input area with respect to the padded area
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
uint8_t * data
The data buffer.
char * y_expr
height expression string
AVRational av_div_q(AVRational b, AVRational c)
Divide one rational by another.
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 AVFrame * get_video_buffer(AVFilterLink *inlink, int w, int h)
#define FILTER_INPUTS(array)
This structure describes decoded (raw) audio or video data.
static const struct @467 planes[]
static const char *const var_names[]
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
#define AV_LOG_VERBOSE
Detailed information.
const char * name
Filter name.
@ AV_OPT_TYPE_RATIONAL
Underlying C type is AVRational.
A link between two filters.
static const AVFilterPad avfilter_vf_pad_outputs[]
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
void * priv
private data for use by the filter
A filter pad used for either input or output.
static int config_output(AVFilterLink *outlink)
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
#define FF_ARRAY_ELEMS(a)
AVRational sample_aspect_ratio
agreed upon sample aspect ratio
void ff_copy_rectangle2(FFDrawContext *draw, uint8_t *dst[], int dst_linesize[], uint8_t *src[], int src_linesize[], int dst_x, int dst_y, int src_x, int src_y, int w, int h)
Copy a rectangle from an image to another.
static int config_input(AVFilterLink *inlink)
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
AVFILTER_DEFINE_CLASS(pad)
#define FILTER_OUTPUTS(array)
int h
output dimensions, a value of 0 will result in the input size
Describe the class of an AVClass context structure.
int av_frame_copy_props(AVFrame *dst, const AVFrame *src)
Copy only "metadata" fields from src to dst.
Rational number (pair of numerator and denominator).
@ AV_OPT_TYPE_COLOR
Underlying C type is uint8_t[4].
static const AVFilterPad avfilter_vf_pad_inputs[]
AVBufferRef * av_frame_get_plane_buffer(const AVFrame *frame, int plane)
Get the buffer reference a given data plane is stored in.
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
int av_expr_parse_and_eval(double *d, const char *s, const char *const *const_names, const double *const_values, const char *const *func1_names, double(*const *funcs1)(void *, double), const char *const *func2_names, double(*const *funcs2)(void *, double, double), void *opaque, int log_offset, void *log_ctx)
Parse and evaluate an expression.
static const AVOption pad_options[]
int ff_draw_init2(FFDrawContext *draw, enum AVPixelFormat format, enum AVColorSpace csp, enum AVColorRange range, unsigned flags)
Init a draw context.
int format
agreed upon media format
static int query_formats(const AVFilterContext *ctx, AVFilterFormatsConfig **cfg_in, AVFilterFormatsConfig **cfg_out)
void ff_fill_rectangle(FFDrawContext *draw, FFDrawColor *color, uint8_t *dst[], int dst_linesize[], int dst_x, int dst_y, int w, int h)
Fill a rectangle with an uniform color.
int av_frame_is_writable(AVFrame *frame)
Check if the frame data is writable.
int format
format of the frame, -1 if unknown or unset Values correspond to enum AVPixelFormat for video frames,...
AVFilterContext * src
source filter
char * h_expr
height expression string
char * x_expr
width expression string
static int frame_needs_copy(PadContext *s, AVFrame *frame)
size_t size
Size of data in bytes.
#define i(width, name, range_min, range_max)
int w
agreed upon image width
AVFilterFormats * ff_draw_supported_pixel_formats(unsigned flags)
Return the list of pixel formats supported by the draw functions.
static int buffer_needs_copy(PadContext *s, AVFrame *frame, AVBufferRef *buf)
#define FILTER_QUERY_FUNC2(func)
int ff_draw_round_to_sub(FFDrawContext *draw, int sub_dir, int round_dir, int value)
Round a dimension according to subsampling.
const char * name
Pad name.
int64_t av_rescale(int64_t a, int64_t b, int64_t c)
Rescale a 64-bit integer with rounding to nearest.
void ff_draw_color(FFDrawContext *draw, FFDrawColor *color, const uint8_t rgba[4])
Prepare a color.
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
AVRational sample_aspect_ratio
Sample aspect ratio for the video frame, 0/1 if unknown/unspecified.
uint8_t rgba_color[4]
color for the padding area
int h
agreed upon image height
@ AV_OPT_TYPE_INT
Underlying C type is int.
A reference to a data buffer.
int in_h
width and height for the padded input video, which has to be aligned to the chroma values in order to...
int linesize[AV_NUM_DATA_POINTERS]
For video, a positive or negative value, which is typically indicating the size in bytes of each pict...
@ 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...
@ AV_OPT_TYPE_CONST
Special option type for declaring named constants.