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74 for (
i = 0;
i < 4;
i++) {
75 const int h1 =
i == 1 ||
i == 2 ? ch :
h;
78 (
out->linesize[
i] > 0 ? 0 :
out->linesize[
i] * (h1-1));
88 const int w1 =
c == 1 ||
c == 2 ? cw :
w;
89 const int h1 =
c == 1 ||
c == 2 ? ch :
h;
91 for (
i = 0;
i < h1;
i++) {
120 .
name =
"pixdesctest",
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)
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.
#define FILTER_INPUTS(array)
This structure describes decoded (raw) audio or video data.
const char * name
Filter name.
A link between two filters.
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
A filter pad used for either input or output.
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)
uint8_t log2_chroma_w
Amount to shift the luma width right to find the chroma width.
const AVFilter ff_vf_pixdesctest
#define FILTER_OUTPUTS(array)
void av_read_image_line2(void *dst, const uint8_t *data[4], const int linesize[4], const AVPixFmtDescriptor *desc, int x, int y, int c, int w, int read_pal_component, int dst_element_size)
Read a line from an image, and write the values of the pixel format component c to dst.
#define FFABS(a)
Absolute value, Note, INT_MIN / INT64_MIN result in undefined behavior as they are not representable ...
int av_frame_copy_props(AVFrame *dst, const AVFrame *src)
Copy only "metadata" fields from src to dst.
uint8_t nb_components
The number of components each pixel has, (1-4)
const AVPixFmtDescriptor * pix_desc
uint64_t flags
Combination of AV_PIX_FMT_FLAG_...
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
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
static int config_props(AVFilterLink *inlink)
#define i(width, name, range_min, range_max)
int w
agreed upon image width
#define av_malloc_array(a, b)
const char * name
Pad name.
static const AVFilterPad avfilter_vf_pixdesctest_inputs[]
int h
agreed upon image height
static av_cold void uninit(AVFilterContext *ctx)
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...
void av_write_image_line2(const void *src, uint8_t *data[4], const int linesize[4], const AVPixFmtDescriptor *desc, int x, int y, int c, int w, int src_element_size)
Write the values from src to the pixel format component c of an image line.
#define AV_PIX_FMT_FLAG_PAL
Pixel format has a palette in data[1], values are indexes in this palette.
uint8_t log2_chroma_h
Amount to shift the luma height right to find the chroma height.