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64 static const double ntsc_fps = 30000.0 / 1001.0;
99 #define OFFSET(x) offsetof(FPSContext, x)
100 #define V AV_OPT_FLAG_VIDEO_PARAM
101 #define F AV_OPT_FLAG_FILTERING_PARAM
138 s->frames[0] =
s->frames[1];
143 s->frames_out +=
s->cur_frame_out;
144 if (
s->cur_frame_out > 1) {
146 frame->pts,
s->cur_frame_out - 1);
147 s->dup +=
s->cur_frame_out - 1;
148 }
else if (
s->cur_frame_out == 0) {
153 s->cur_frame_out = 0;
164 while (
s->frames_count > 0) {
170 "%d frames duplicated.\n",
s->frames_in,
s->frames_out,
s->drop,
s->dup);
179 double var_values[
VARS_NB], res;
199 if (first_pts < INT64_MIN || first_pts > INT64_MAX) {
208 s->next_pts =
s->out_pts_off;
210 s->in_pts_off,
s->out_pts_off,
s->start_time);
245 s->frames[
s->frames_count++] =
frame;
256 av_assert1(
s->frames_count == 2 || (
s->status &&
s->frames_count == 1));
261 s->next_pts =
s->frames[0]->pts;
278 if ((
s->frames_count == 2 &&
s->frames[1]->pts <=
s->next_pts) ||
279 (
s->status &&
s->status_pts <=
s->next_pts)) {
293 frame->pts =
s->next_pts++;
297 s->frames[0]->pts,
frame->pts);
337 if (
s->frames_count < 2) {
352 if (
s->frames_count > 0) {
361 if (
s->status &&
s->frames_count == 0) {
390 .priv_class = &fps_class,
#define AV_LOG_WARNING
Something somehow does not look correct.
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.
@ AV_FRAME_DATA_A53_CC
ATSC A53 Part 4 Closed Captions.
#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 AV_LOG_VERBOSE
Detailed information.
static const double ntsc_fps
static const char *const var_names[]
const char * name
Filter name.
static const double pal_fps
static av_cold int init(AVFilterContext *ctx)
A link between two filters.
#define FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink)
Forward the status on an output link to an input link.
static int config_props(AVFilterLink *outlink)
int ff_inoutlink_check_flow(AVFilterLink *inlink, AVFilterLink *outlink)
Check for flow control between input and output.
static av_cold void uninit(AVFilterContext *ctx)
int ff_inlink_consume_frame(AVFilterLink *link, AVFrame **rframe)
Take a frame from the link's FIFO and update the link's stats.
@ AV_ROUND_UP
Round toward +infinity.
A filter pad used for either input or output.
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
static void update_eof_pts(AVFilterContext *ctx, FPSContext *s, AVFilterLink *inlink, AVFilterLink *outlink, int64_t status_pts)
static void ff_outlink_set_status(AVFilterLink *link, int status, int64_t pts)
Set the status field of a link from the source filter.
int eof_action
action performed for last frame in FIFO
int frames_in
number of frames on input
static double av_q2d(AVRational a)
Convert an AVRational to a double.
AVRational frame_rate
Frame rate of the stream on the link, or 1/0 if unknown or variable; if left to 0/0,...
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
AVFrame * av_frame_clone(const AVFrame *src)
Create a new frame that references the same data as src.
int frames_count
number of buffered frames
#define FILTER_INPUTS(array)
static int write_frame(AVFilterContext *ctx, FPSContext *s, AVFilterLink *outlink, int *again)
int64_t out_pts_off
output frame pts offset for start_time handling
static const double ntsc_film_fps
Describe the class of an AVClass context structure.
@ AV_ROUND_INF
Round away from zero.
static const AVFilterPad avfilter_vf_fps_outputs[]
@ AV_ROUND_NEAR_INF
Round to nearest and halfway cases away from zero.
int64_t status_pts
buffered input status timestamp
AVFrame * frames[2]
buffered frames
int ff_inlink_acknowledge_status(AVFilterLink *link, int *rstatus, int64_t *rpts)
Test and acknowledge the change of status on the link.
int status
buffered input status
static const AVFilterPad avfilter_vf_fps_inputs[]
static int read_frame(AVFilterContext *ctx, FPSContext *s, AVFilterLink *inlink, AVFilterLink *outlink)
int ff_inlink_check_available_frame(AVFilterLink *link)
Test if a frame is available on the link.
#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.
@ AV_ROUND_ZERO
Round toward zero.
static int64_t start_time
#define AV_NOPTS_VALUE
Undefined timestamp value.
AVFilterContext * src
source filter
void av_frame_remove_side_data(AVFrame *frame, enum AVFrameSideDataType type)
Remove and free all side data instances of the given type.
int64_t next_pts
pts of the next frame to output
FF_FILTER_FORWARD_WANTED(outlink, inlink)
int drop
number of framed dropped
static AVFrame * shift_frame(AVFilterContext *ctx, FPSContext *s)
char * framerate
expression that defines the target framerate
#define AV_TIME_BASE
Internal time base represented as integer.
#define av_assert1(cond)
assert() equivalent, that does not lie in speed critical code.
@ AV_ROUND_DOWN
Round toward -infinity.
AVRational av_d2q(double d, int max)
Convert a double precision floating point number to a rational.
static av_always_inline AVRational av_inv_q(AVRational q)
Invert a rational.
const char * name
Pad name.
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
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 again
#define AVFILTER_FLAG_METADATA_ONLY
The filter is a "metadata" filter - it does not modify the frame data in any way.
int64_t in_pts_off
input frame pts offset for start_time handling
static const double film_fps
AVRational time_base
Define the time base used by the PTS of the frames/samples which will pass through this link.
int dup
number of frames duplicated
double start_time
pts, in seconds, of the expected first frame
@ AV_ROUND_PASS_MINMAX
Flag telling rescaling functions to pass INT64_MIN/MAX through unchanged, avoiding special cases for ...
AVFILTER_DEFINE_CLASS(fps)
static int activate(AVFilterContext *ctx)
#define FILTER_OUTPUTS(array)
static const AVOption fps_options[]
#define flags(name, subs,...)
int cur_frame_out
number of times current frame has been output
int64_t av_rescale_q_rnd(int64_t a, AVRational bq, AVRational cq, enum AVRounding rnd)
Rescale a 64-bit integer by 2 rational numbers with specified rounding.
int frames_out
number of frames on output
int rounding
AVRounding method for timestamps.
void ff_filter_set_ready(AVFilterContext *filter, unsigned priority)
Mark a filter ready and schedule it for activation.