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48 #define OFFSET(x) offsetof(TPadContext, x)
49 #define VF AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
52 {
"start",
"set the number of frames to delay input",
OFFSET(pad_start),
AV_OPT_TYPE_INT, {.i64=0}, 0, INT_MAX,
VF },
53 {
"stop",
"set the number of frames to add after input finished",
OFFSET(pad_stop),
AV_OPT_TYPE_INT, {.i64=0}, -1, INT_MAX,
VF },
54 {
"start_mode",
"set the mode of added frames to start",
OFFSET(start_mode),
AV_OPT_TYPE_INT, {.i64=0}, 0, 1,
VF,
"mode" },
57 {
"stop_mode",
"set the mode of added frames to end",
OFFSET(stop_mode),
AV_OPT_TYPE_INT, {.i64=0}, 0, 1,
VF,
"mode" },
85 if (!
s->pad_stop && !
s->pad_start) {
107 if (
s->start_mode == 1 &&
s->pad_start > 0) {
113 }
else if (!
s->cache_start) {
122 if (
s->pad_start == 0)
123 s->cache_start =
NULL;
127 if (!
s->eof && !
s->pad_start) {
132 if (
s->stop_mode == 1 &&
s->pad_stop != 0) {
146 if (
s->stop_mode == 0) {
153 }
else if (
s->stop_mode == 1) {
154 if (!
s->cache_stop) {
184 if (
s->start_duration)
186 if (
s->stop_duration)
218 .priv_class = &tpad_class,
AVFrame * ff_get_video_buffer(AVFilterLink *link, int w, int h)
Request a picture buffer with a specific set of permissions.
they must not be accessed directly The fifo field contains the frames that are queued in the input for processing by the filter The status_in and status_out fields contains the queued status(EOF or error) of the link
static int activate(AVFilterContext *ctx)
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.
#define AVERROR_EOF
End of file.
#define AV_TIME_BASE_Q
Internal time base represented as fractional value.
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.
This structure describes decoded (raw) audio or video data.
#define FILTER_QUERY_FUNC(func)
const char * name
Filter name.
A link between two filters.
#define FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink)
Forward the status on an output link to an input link.
const AVFilter ff_vf_tpad
int ff_inlink_consume_frame(AVFilterLink *link, AVFrame **rframe)
Take a frame from the link's FIFO and update the link's stats.
A filter pad used for either input or output.
static void ff_outlink_set_status(AVFilterLink *link, int status, int64_t pts)
Set the status field of a link from the source filter.
AVRational frame_rate
Frame rate of the stream on the link, or 1/0 if unknown or variable; if left to 0/0,...
AVFrame * av_frame_clone(const AVFrame *src)
Create a new frame that references the same data as src.
int64_t av_rescale_q(int64_t a, AVRational bq, AVRational cq)
Rescale a 64-bit integer by 2 rational numbers.
int ff_draw_init(FFDrawContext *draw, enum AVPixelFormat format, unsigned flags)
#define FILTER_INPUTS(array)
AVFrame * ff_inlink_peek_frame(AVFilterLink *link, size_t idx)
Access a frame in the link fifo without consuming it.
Describe the class of an AVClass context structure.
static const AVFilterPad tpad_inputs[]
int ff_inlink_acknowledge_status(AVFilterLink *link, int *rstatus, int64_t *rpts)
Test and acknowledge the change of status on the link.
size_t ff_inlink_queued_frames(AVFilterLink *link)
Get the number of frames available on the link.
static av_cold void uninit(AVFilterContext *ctx)
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
AVFILTER_DEFINE_CLASS(tpad)
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.
static int config_input(AVFilterLink *inlink)
FF_FILTER_FORWARD_WANTED(outlink, inlink)
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 av_always_inline AVRational av_inv_q(AVRational q)
Invert a rational.
const char * name
Pad name.
uint8_t rgba_color[4]
color for the padding area
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
static const AVFilterPad tpad_outputs[]
int h
agreed upon image height
AVRational time_base
Define the time base used by the PTS of the frames/samples which will pass through this link.
#define FILTER_OUTPUTS(array)
static int query_formats(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
static const AVOption tpad_options[]