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39 "out_time",
"time",
"ot",
101 #define OFFSET(x) offsetof(ZPContext, x)
102 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
118 ZPContext *
s =
ctx->priv;
128 ZPContext *
s =
ctx->priv;
154 double *
zoom,
double *dx,
double *dy)
156 ZPContext *
s =
ctx->priv;
161 int k, x, y,
w,
h,
ret = 0;
187 var_values[
VAR_X] = *dx;
188 x &= ~((1 <<
s->desc->log2_chroma_w) - 1);
193 var_values[
VAR_Y] = *dy;
194 y &= ~((1 <<
s->desc->log2_chroma_h) - 1);
214 for (k = 0; in->
data[k]; k++)
238 if (
s->current_frame >=
s->nb_frames) {
244 s->prev_zoom = *
zoom;
245 s->prev_nb_frames =
s->nb_frames;
247 s->current_frame = 0;
261 ZPContext *
s =
ctx->priv;
272 double zoom = -1, dx = -1, dy = -1;
281 double zoom = -1, dx = -1, dy = -1, nb_frames;
299 (
double)
inlink->sample_aspect_ratio.num /
inlink->sample_aspect_ratio.den : 1;
301 s->var_values[
VAR_HSUB] = 1 <<
s->desc->log2_chroma_w;
302 s->var_values[
VAR_VSUB] = 1 <<
s->desc->log2_chroma_h;
346 ZPContext *
s =
ctx->priv;
367 .priv_size =
sizeof(ZPContext),
368 .priv_class = &zoompan_class,
static void error(const char *err)
AVFrame * ff_get_video_buffer(AVFilterLink *link, int w, int h)
Request a picture buffer with a specific set of permissions.
AVPixelFormat
Pixel format.
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
#define FILTER_PIXFMTS_ARRAY(array)
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)
@ AV_OPT_TYPE_VIDEO_RATE
Underlying C type is AVRational.
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 void zoom(float *u, float *v, float amount)
void sws_freeContext(SwsContext *swsContext)
Free the swscaler context swsContext.
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.
int64_t pts
Presentation timestamp in time_base units (time when frame should be shown to user).
@ AV_PIX_FMT_YUV440P
planar YUV 4:4:0 (1 Cr & Cb sample per 1x2 Y samples)
const AVPixFmtDescriptor * desc
const char * name
Filter name.
static const AVFilterPad outputs[]
AVFILTER_DEFINE_CLASS(zoompan)
A link between two filters.
#define FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink)
Forward the status on an output link to an input link.
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Link properties exposed to filter code, but not external callers.
int av_expr_parse(AVExpr **expr, const char *s, const char *const *const_names, const char *const *func1_names, double(*const *funcs1)(void *, double), const char *const *func2_names, double(*const *funcs2)(void *, double, double), int log_offset, void *log_ctx)
Parse an expression.
int ff_inlink_consume_frame(AVFilterLink *link, AVFrame **rframe)
Take a frame from the link's FIFO and update the link's stats.
@ AV_PIX_FMT_GBRAP
planar GBRA 4:4:4:4 32bpp
static av_cold int init(AVFilterContext *ctx)
av_warn_unused_result int sws_init_context(SwsContext *sws_context, SwsFilter *srcFilter, SwsFilter *dstFilter)
Initialize the swscaler context sws_context.
void av_expr_free(AVExpr *e)
Free a parsed expression previously created with av_expr_parse().
A filter pad used for either input or output.
@ AV_PIX_FMT_YUVJ411P
planar YUV 4:1:1, 12bpp, (1 Cr & Cb sample per 4x1 Y samples) full scale (JPEG), deprecated in favor ...
const AVFilterPad ff_video_default_filterpad[1]
An AVFilterPad array whose only entry has name "default" and is of type AVMEDIA_TYPE_VIDEO.
@ AV_PIX_FMT_YUVJ422P
planar YUV 4:2:2, 16bpp, full scale (JPEG), deprecated in favor of AV_PIX_FMT_YUV422P and setting col...
static void ff_outlink_set_status(AVFilterLink *link, int status, int64_t pts)
Set the status field of a link from the source filter.
void ff_inlink_request_frame(AVFilterLink *link)
Mark that a frame is wanted on the link.
@ AV_PIX_FMT_YUVA420P
planar YUV 4:2:0, 20bpp, (1 Cr & Cb sample per 2x2 Y & A samples)
static int activate(AVFilterContext *ctx)
#define AV_CEIL_RSHIFT(a, b)
static double av_q2d(AVRational a)
Convert an AVRational to a double.
double var_values[VARS_NB]
double av_expr_eval(AVExpr *e, const double *const_values, void *opaque)
Evaluate a previously parsed expression.
@ AV_PIX_FMT_YUV420P
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
#define FILTER_OUTPUTS(array)
@ AV_PIX_FMT_YUVJ444P
planar YUV 4:4:4, 24bpp, full scale (JPEG), deprecated in favor of AV_PIX_FMT_YUV444P and setting col...
Describe the class of an AVClass context structure.
static int output_single_frame(AVFilterContext *ctx, AVFrame *in, double *var_values, int i, double *zoom, double *dx, double *dy)
@ SWS_BICUBIC
2-tap cubic B-spline
Rational number (pair of numerator and denominator).
@ AV_PIX_FMT_YUVJ420P
planar YUV 4:2:0, 12bpp, full scale (JPEG), deprecated in favor of AV_PIX_FMT_YUV420P and setting col...
@ AV_OPT_TYPE_IMAGE_SIZE
Underlying C type is two consecutive integers.
static enum AVPixelFormat pix_fmts[]
static const AVOption zoompan_options[]
@ AV_PIX_FMT_GRAY8
Y , 8bpp.
int ff_inlink_acknowledge_status(AVFilterLink *link, int *rstatus, int64_t *rpts)
Test and acknowledge the change of status on the link.
int av_opt_set_int(void *obj, const char *name, int64_t val, int search_flags)
static FilterLink * ff_filter_link(AVFilterLink *link)
static const char *const var_names[]
#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.
SwsContext * sws_alloc_context(void)
Allocate an empty SwsContext and set its fields to default values.
int format
agreed upon media format
#define AV_NOPTS_VALUE
Undefined timestamp value.
int format
format of the frame, -1 if unknown or unset Values correspond to enum AVPixelFormat for video frames,...
AVFilterContext * src
source filter
@ AV_PIX_FMT_YUVA444P
planar YUV 4:4:4 32bpp, (1 Cr & Cb sample per 1x1 Y & A samples)
and forward the test the status of outputs and forward it to the corresponding return FFERROR_NOT_READY If the filters stores internally one or a few frame for some input
#define i(width, name, range_min, range_max)
int w
agreed upon image width
@ AV_PIX_FMT_YUVJ440P
planar YUV 4:4:0 full scale (JPEG), deprecated in favor of AV_PIX_FMT_YUV440P and setting color_range
static av_always_inline AVRational av_inv_q(AVRational q)
Invert a rational.
const char * name
Pad name.
const AVFilter ff_vf_zoompan
int h
agreed upon image height
int attribute_align_arg sws_scale(SwsContext *sws, const uint8_t *const srcSlice[], const int srcStride[], int srcSliceY, int srcSliceH, uint8_t *const dst[], const int dstStride[])
swscale wrapper, so we don't need to export the SwsContext.
static int config_output(AVFilterLink *outlink)
AVRational time_base
Define the time base used by the PTS of the frames/samples which will pass through this link.
@ AV_PIX_FMT_YUV444P
planar YUV 4:4:4, 24bpp, (1 Cr & Cb sample per 1x1 Y samples)
@ AV_PIX_FMT_GBRP
planar GBR 4:4:4 24bpp
@ AV_PIX_FMT_YUV422P
planar YUV 4:2:2, 16bpp, (1 Cr & Cb sample per 2x1 Y samples)
Descriptor that unambiguously describes how the bits of a pixel are stored in the up to 4 data planes...
@ AV_PIX_FMT_YUV411P
planar YUV 4:1:1, 12bpp, (1 Cr & Cb sample per 4x1 Y samples)
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_PIX_FMT_YUV410P
planar YUV 4:1:0, 9bpp, (1 Cr & Cb sample per 4x4 Y samples)
static av_cold void uninit(AVFilterContext *ctx)
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
AVRational frame_rate
Frame rate of the stream on the link, or 1/0 if unknown or variable.
@ 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...
Main external API structure.
@ AV_PIX_FMT_YUVA422P
planar YUV 4:2:2 24bpp, (1 Cr & Cb sample per 2x1 Y & A samples)
int64_t frame_count_in
Number of past frames sent through the link.