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63 for (buf =
s->root.next; buf; buf =
tmp) {
82 s->last =
s->last->next;
91 if (
s->last ==
s->root.next)
131 .description =
NULL_IF_CONFIG_SMALL(
"Buffer input images and send them when they are requested."),
158 .description =
NULL_IF_CONFIG_SMALL(
"Buffer input frames and send them when they are requested."),
static const AVFilterPad avfilter_af_afifo_outputs[]
static av_cold void uninit(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.
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.
int ff_request_frame(AVFilterLink *link)
Request an input frame from the filter at the other end of the link.
static const AVFilterPad avfilter_vf_fifo_inputs[]
const char * name
Filter name.
A link between two filters.
static const AVFilterPad avfilter_vf_fifo_outputs[]
void * priv
private data for use by the filter
static void queue_pop(FifoContext *s)
AVFrame * out
When a specific number of output samples is requested, the partial buffer is stored here.
A filter pad used for either input or output.
int allocated_samples
number of samples out was allocated for
#define FILTER_INPUTS(array)
static const AVFilterPad avfilter_af_afifo_inputs[]
AVFilterLink ** inputs
array of pointers to input links
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
static int request_frame(AVFilterLink *outlink)
AVFilterContext * src
source filter
static int add_to_queue(AVFilterLink *inlink, AVFrame *frame)
const AVFilter ff_vf_fifo
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
const AVFilter ff_af_afifo
const char * name
Pad name.
#define AVFILTER_FLAG_METADATA_ONLY
The filter is a "metadata" filter - it does not modify the frame data in any way.
Buf * last
last buffered frame
#define FILTER_OUTPUTS(array)
#define flags(name, subs,...)
static av_cold int init(AVFilterContext *ctx)