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21 #include "config_components.h"
46 #define OFFSET(x) offsetof(PermsContext, x)
47 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM | AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_VIDEO_PARAM
48 #define TFLAGS AV_OPT_FLAG_FILTERING_PARAM | AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_RUNTIME_PARAM
66 if (
s->random_seed == -1)
68 seed =
s->random_seed;
76 static const char *
const perm_str[2] = {
"RO",
"RW" };
92 default: out_perm = in_perm;
break;
97 in_perm == out_perm ?
" (no-op)" :
"");
99 if (in_perm ==
RO && out_perm ==
RW) {
103 }
else if (in_perm ==
RW && out_perm ==
RO) {
111 if (in_perm ==
RW && out_perm ==
RO)
118 #if CONFIG_APERMS_FILTER
131 .priv_class = &perms_class,
142 #if CONFIG_PERMS_FILTER
159 .priv_class = &perms_class,
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
av_cold void av_lfg_init(AVLFG *c, unsigned int seed)
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.
#define FILTER_INPUTS(array)
This structure describes decoded (raw) audio or video data.
#define AV_LOG_VERBOSE
Detailed information.
const char * name
Filter name.
A link between two filters.
uint32_t av_get_random_seed(void)
Get a seed to use in conjunction with random functions.
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.
static unsigned int av_lfg_get(AVLFG *c)
Get the next random unsigned 32-bit number using an ALFG.
@ AV_OPT_TYPE_INT64
Underlying C type is int64_t.
AVFrame * av_frame_clone(const AVFrame *src)
Create a new frame that references the same data as src.
#define FILTER_OUTPUTS(array)
int ff_inlink_make_frame_writable(AVFilterLink *link, AVFrame **rframe)
Make sure a frame is writable.
Describe the class of an AVClass context structure.
const AVFilterPad ff_audio_default_filterpad[1]
An AVFilterPad array whose only entry has name "default" and is of type AVMEDIA_TYPE_AUDIO.
Context structure for the Lagged Fibonacci PRNG.
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
const AVFilter ff_af_aperms
int av_frame_is_writable(AVFrame *frame)
Check if the frame data is writable.
const AVFilter ff_vf_perms
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 char *const perm_str[2]
#define AV_LOG_INFO
Standard information.
#define AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC
Some filters support a generic "enable" expression option that can be used to enable or disable a fil...
static av_cold int init(AVFilterContext *ctx)
const char * name
Pad name.
AVFILTER_DEFINE_CLASS_EXT(perms, "(a)perms", options)
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
@ AV_OPT_TYPE_INT
Underlying C type is int.
#define AVFILTER_FLAG_METADATA_ONLY
The filter is a "metadata" filter - it does not modify the frame data in any way.
static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
@ AV_OPT_TYPE_CONST
Special option type for declaring named constants.