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50 #define OFFSET(x) offsetof(IlContext, x)
51 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
111 int dst_linesize,
int src_linesize,
116 const int m =
h >> 1;
121 for (y = 0; y < m; y++) {
122 memcpy(dst + dst_linesize * y ,
src + src_linesize * (y * 2 +
a),
w);
123 memcpy(dst + dst_linesize * (y + m),
src + src_linesize * (y * 2 +
b),
w);
127 for (y = 0; y < m; y++) {
128 memcpy(dst + dst_linesize * y * 2 ,
src + src_linesize * (y * 2 +
a),
w);
129 memcpy(dst + dst_linesize * (y * 2 + 1),
src + src_linesize * (y * 2 +
b),
w);
133 for (y = 0; y < m; y++) {
134 memcpy(dst + dst_linesize * (y * 2 +
a),
src + src_linesize * y ,
w);
135 memcpy(dst + dst_linesize * (y * 2 +
b),
src + src_linesize * (y + m),
w);
158 s->luma_mode,
s->luma_swap);
162 s->linesize[
comp],
s->chroma_height,
164 s->chroma_mode,
s->chroma_swap);
168 comp =
s->nb_planes - 1;
172 s->alpha_mode,
s->alpha_swap);
195 .priv_class = &il_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
static void comp(unsigned char *dst, ptrdiff_t dst_stride, unsigned char *src, ptrdiff_t src_stride, int add)
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.
int av_pix_fmt_count_planes(enum AVPixelFormat pix_fmt)
AVFILTER_DEFINE_CLASS(il)
#define AV_PIX_FMT_FLAG_HWACCEL
Pixel format is an HW accelerated format.
static int filter_frame(AVFilterLink *inlink, AVFrame *inpicref)
static const AVFilterPad inputs[]
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.
int av_image_fill_linesizes(int linesizes[4], enum AVPixelFormat pix_fmt, int width)
Fill plane linesizes for an image with pixel format pix_fmt and width width.
#define AV_CEIL_RSHIFT(a, b)
static int config_input(AVFilterLink *inlink)
#define AV_PIX_FMT_FLAG_ALPHA
The pixel format has an alpha channel.
#define FILTER_OUTPUTS(array)
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.
int alpha_mode
FilterMode.
static void interleave(uint8_t *dst, uint8_t *src, int w, int h, int dst_linesize, int src_linesize, enum FilterMode mode, int swap)
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
int ff_filter_process_command(AVFilterContext *ctx, const char *cmd, const char *arg, char *res, int res_len, int flags)
Generic processing of user supplied commands that are set in the same way as the filter options.
static const AVOption il_options[]
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...
int w
agreed upon image width
const char * name
Pad name.
static int query_formats(AVFilterContext *ctx)
int h
agreed upon image height
@ AV_OPT_TYPE_INT
Underlying C type is int.
Descriptor that unambiguously describes how the bits of a pixel are stored in the up to 4 data planes...
@ AV_OPT_TYPE_BOOL
Underlying C type is int.
int linesize[AV_NUM_DATA_POINTERS]
For video, a positive or negative value, which is typically indicating the size in bytes of each pict...
#define AV_PIX_FMT_FLAG_PAL
Pixel format has a palette in data[1], values are indexes in this palette.
@ AV_OPT_TYPE_CONST
Special option type for declaring named constants.
#define FILTER_QUERY_FUNC(func)