libavfilter/avfilter.h File Reference

#include "libavutil/avutil.h"
#include "libavutil/samplefmt.h"
#include <stddef.h>

Go to the source code of this file.

Data Structures

struct  AVFilterBuffer
 A reference-counted buffer data type used by the filter system. More...
struct  AVFilterBufferRefAudioProps
 Audio specific properties in a reference to an AVFilterBuffer. More...
struct  AVFilterBufferRefVideoProps
 Video specific properties in a reference to an AVFilterBuffer. More...
struct  AVFilterBufferRef
 A reference to an AVFilterBuffer. More...
struct  AVFilterFormats
 A list of supported formats for one end of a filter link. More...
struct  AVFilterPad
 A filter pad used for either input or output. More...
struct  AVFilter
 Filter definition. More...
struct  AVFilterContext
 An instance of a filter. More...
struct  AVFilterLink
 A link between two filters. More...

Defines

#define LIBAVFILTER_VERSION_MAJOR   1
#define LIBAVFILTER_VERSION_MINOR   76
#define LIBAVFILTER_VERSION_MICRO   0
#define LIBAVFILTER_VERSION_INT
#define LIBAVFILTER_VERSION
#define LIBAVFILTER_BUILD   LIBAVFILTER_VERSION_INT
#define AV_PERM_READ   0x01
 can read from the buffer
#define AV_PERM_WRITE   0x02
 can write to the buffer
#define AV_PERM_PRESERVE   0x04
 nobody else can overwrite the buffer
#define AV_PERM_REUSE   0x08
 can output the buffer multiple times, with the same contents each time
#define AV_PERM_REUSE2   0x10
 can output the buffer multiple times, modified each time
#define AV_PERM_NEG_LINESIZES   0x20
 the buffer requested can have negative linesizes

Typedefs

typedef struct AVFilterContext AVFilterContext
typedef struct AVFilterLink AVFilterLink
typedef struct AVFilterPad AVFilterPad

Functions

unsigned avfilter_version (void)
 Return the LIBAVFILTER_VERSION_INT constant.
const char * avfilter_configuration (void)
 Return the libavfilter build-time configuration.
const char * avfilter_license (void)
 Return the libavfilter license.
static void avfilter_copy_buffer_ref_props (AVFilterBufferRef *dst, AVFilterBufferRef *src)
 Copy properties of src to dst, without copying the actual data.
AVFilterBufferRefavfilter_ref_buffer (AVFilterBufferRef *ref, int pmask)
 Add a new reference to a buffer.
void avfilter_unref_buffer (AVFilterBufferRef *ref)
 Remove a reference to a buffer.
AVFilterFormatsavfilter_make_format_list (const int *fmts)
 Create a list of supported formats.
int avfilter_add_format (AVFilterFormats **avff, int fmt)
 Add fmt to the list of media formats contained in *avff.
AVFilterFormatsavfilter_all_formats (enum AVMediaType type)
 Return a list of all formats supported by FFmpeg for the given media type.
AVFilterFormatsavfilter_merge_formats (AVFilterFormats *a, AVFilterFormats *b)
 Return a format list which contains the intersection of the formats of a and b.
void avfilter_formats_ref (AVFilterFormats *formats, AVFilterFormats **ref)
 Add *ref as a new reference to formats.
void avfilter_formats_unref (AVFilterFormats **ref)
 If *ref is non-NULL, remove *ref as a reference to the format list it currently points to, deallocates that list if this was the last reference, and sets *ref to NULL.
void avfilter_formats_changeref (AVFilterFormats **oldref, AVFilterFormats **newref)
 Before After ________ ________ |formats |<---------.
void avfilter_default_start_frame (AVFilterLink *link, AVFilterBufferRef *picref)
 default handler for start_frame() for video inputs
void avfilter_default_draw_slice (AVFilterLink *link, int y, int h, int slice_dir)
 default handler for draw_slice() for video inputs
void avfilter_default_end_frame (AVFilterLink *link)
 default handler for end_frame() for video inputs
void avfilter_default_filter_samples (AVFilterLink *link, AVFilterBufferRef *samplesref)
 default handler for filter_samples() for audio inputs
int avfilter_default_config_output_link (AVFilterLink *link)
 default handler for config_props() for audio/video outputs
int avfilter_default_config_input_link (AVFilterLink *link)
 default handler for config_props() for audio/video inputs
AVFilterBufferRefavfilter_default_get_video_buffer (AVFilterLink *link, int perms, int w, int h)
 default handler for get_video_buffer() for video inputs
AVFilterBufferRefavfilter_default_get_audio_buffer (AVFilterLink *link, int perms, enum AVSampleFormat sample_fmt, int size, int64_t channel_layout, int planar)
 default handler for get_audio_buffer() for audio inputs
void avfilter_set_common_formats (AVFilterContext *ctx, AVFilterFormats *formats)
 A helper for query_formats() which sets all links to the same list of formats.
int avfilter_default_query_formats (AVFilterContext *ctx)
 Default handler for query_formats().
void avfilter_null_start_frame (AVFilterLink *link, AVFilterBufferRef *picref)
 start_frame() handler for filters which simply pass video along
void avfilter_null_draw_slice (AVFilterLink *link, int y, int h, int slice_dir)
 draw_slice() handler for filters which simply pass video along
void avfilter_null_end_frame (AVFilterLink *link)
 end_frame() handler for filters which simply pass video along
void avfilter_null_filter_samples (AVFilterLink *link, AVFilterBufferRef *samplesref)
 filter_samples() handler for filters which simply pass audio along
AVFilterBufferRefavfilter_null_get_video_buffer (AVFilterLink *link, int perms, int w, int h)
 get_video_buffer() handler for filters which simply pass video along
AVFilterBufferRefavfilter_null_get_audio_buffer (AVFilterLink *link, int perms, enum AVSampleFormat sample_fmt, int size, int64_t channel_layout, int planar)
 get_audio_buffer() handler for filters which simply pass audio along
int avfilter_link (AVFilterContext *src, unsigned srcpad, AVFilterContext *dst, unsigned dstpad)
 Link two filters together.
int avfilter_config_links (AVFilterContext *filter)
 Negotiate the media format, dimensions, etc of all inputs to a filter.
AVFilterBufferRefavfilter_get_video_buffer (AVFilterLink *link, int perms, int w, int h)
 Request a picture buffer with a specific set of permissions.
AVFilterBufferRefavfilter_get_video_buffer_ref_from_arrays (uint8_t *data[4], int linesize[4], int perms, int w, int h, enum PixelFormat format)
 Create a buffer reference wrapped around an already allocated image buffer.
AVFilterBufferRefavfilter_get_audio_buffer (AVFilterLink *link, int perms, enum AVSampleFormat sample_fmt, int size, int64_t channel_layout, int planar)
 Request an audio samples buffer with a specific set of permissions.
int avfilter_request_frame (AVFilterLink *link)
 Request an input frame from the filter at the other end of the link.
int avfilter_poll_frame (AVFilterLink *link)
 Poll a frame from the filter chain.
void avfilter_start_frame (AVFilterLink *link, AVFilterBufferRef *picref)
 Notifie the next filter of the start of a frame.
void avfilter_end_frame (AVFilterLink *link)
 Notifie the next filter that the current frame has finished.
void avfilter_draw_slice (AVFilterLink *link, int y, int h, int slice_dir)
 Send a slice to the next filter.
void avfilter_filter_samples (AVFilterLink *link, AVFilterBufferRef *samplesref)
 Send a buffer of audio samples to the next filter.
void avfilter_register_all (void)
 Initialize the filter system.
void avfilter_uninit (void)
 Uninitialize the filter system.
int avfilter_register (AVFilter *filter)
 Register a filter.
AVFilteravfilter_get_by_name (const char *name)
 Get a filter definition matching the given name.
AVFilter ** av_filter_next (AVFilter **filter)
 If filter is NULL, returns a pointer to the first registered filter pointer, if filter is non-NULL, returns the next pointer after filter.
int avfilter_open (AVFilterContext **filter_ctx, AVFilter *filter, const char *inst_name)
 Create a filter instance.
int avfilter_init_filter (AVFilterContext *filter, const char *args, void *opaque)
 Initialize a filter.
void avfilter_free (AVFilterContext *filter)
 Free a filter context.
int avfilter_insert_filter (AVFilterLink *link, AVFilterContext *filt, unsigned filt_srcpad_idx, unsigned filt_dstpad_idx)
 Insert a filter in the middle of an existing link.
void avfilter_insert_pad (unsigned idx, unsigned *count, size_t padidx_off, AVFilterPad **pads, AVFilterLink ***links, AVFilterPad *newpad)
 Insert a new pad.
static void avfilter_insert_inpad (AVFilterContext *f, unsigned index, AVFilterPad *p)
 Insert a new input pad for the filter.
static void avfilter_insert_outpad (AVFilterContext *f, unsigned index, AVFilterPad *p)
 Insert a new output pad for the filter.


Define Documentation

#define AV_PERM_NEG_LINESIZES   0x20

the buffer requested can have negative linesizes

Definition at line 92 of file avfilter.h.

Referenced by avfilter_start_frame(), ff_get_ref_perms_string(), get_video_buffer(), and start_frame().

#define AV_PERM_PRESERVE   0x04

nobody else can overwrite the buffer

Definition at line 89 of file avfilter.h.

Referenced by ff_get_ref_perms_string(), movie_get_frame(), request_frame(), return_frame(), and start_frame().

#define AV_PERM_READ   0x01

#define AV_PERM_REUSE   0x08

can output the buffer multiple times, with the same contents each time

Definition at line 90 of file avfilter.h.

Referenced by ff_get_ref_perms_string(), return_frame(), and start_frame().

#define AV_PERM_REUSE2   0x10

can output the buffer multiple times, modified each time

Definition at line 91 of file avfilter.h.

Referenced by ff_get_ref_perms_string(), movie_get_frame(), and request_frame().

#define AV_PERM_WRITE   0x02

#define LIBAVFILTER_BUILD   LIBAVFILTER_VERSION_INT

Definition at line 38 of file avfilter.h.

#define LIBAVFILTER_VERSION

#define LIBAVFILTER_VERSION_INT

#define LIBAVFILTER_VERSION_MAJOR   1

Definition at line 28 of file avfilter.h.

#define LIBAVFILTER_VERSION_MICRO   0

Definition at line 30 of file avfilter.h.

#define LIBAVFILTER_VERSION_MINOR   76

Definition at line 29 of file avfilter.h.


Typedef Documentation

Definition at line 58 of file avfilter.h.

typedef struct AVFilterLink AVFilterLink

Definition at line 59 of file avfilter.h.

typedef struct AVFilterPad AVFilterPad

Definition at line 60 of file avfilter.h.


Function Documentation

AVFilter** av_filter_next ( AVFilter **  filter  ) 

If filter is NULL, returns a pointer to the first registered filter pointer, if filter is non-NULL, returns the next pointer after filter.

If the returned pointer points to NULL, the last registered filter was already reached.

Definition at line 545 of file avfilter.c.

Referenced by show_filters().

int avfilter_add_format ( AVFilterFormats **  avff,
int  fmt 
)

Add fmt to the list of media formats contained in *avff.

If *avff is NULL the function allocates the filter formats struct and puts its pointer in *avff.

Returns:
a non negative value in case of success, or a negative value corresponding to an AVERROR code in case of error

Definition at line 89 of file formats.c.

Referenced by avfilter_all_formats(), and query_formats().

AVFilterFormats* avfilter_all_formats ( enum AVMediaType  type  ) 

Return a list of all formats supported by FFmpeg for the given media type.

Definition at line 106 of file formats.c.

Referenced by avfilter_default_query_formats().

int avfilter_config_links ( AVFilterContext filter  ) 

Negotiate the media format, dimensions, etc of all inputs to a filter.

Parameters:
filter the filter to negotiate the properties for its inputs
Returns:
zero on successful negotiation

Definition at line 165 of file avfilter.c.

Referenced by avfilter_config_links(), and ff_avfilter_graph_config_links().

const char* avfilter_configuration ( void   ) 

Return the libavfilter build-time configuration.

Definition at line 35 of file avfilter.c.

static void avfilter_copy_buffer_ref_props ( AVFilterBufferRef dst,
AVFilterBufferRef src 
) [inline, static]

Copy properties of src to dst, without copying the actual data.

Definition at line 152 of file avfilter.h.

Referenced by avfilter_default_start_frame(), avfilter_start_frame(), and start_frame().

int avfilter_default_config_input_link ( AVFilterLink link  ) 

default handler for config_props() for audio/video inputs

int avfilter_default_config_output_link ( AVFilterLink link  ) 

default handler for config_props() for audio/video outputs

Definition at line 206 of file defaults.c.

Referenced by avfilter_config_links().

void avfilter_default_draw_slice ( AVFilterLink link,
int  y,
int  h,
int  slice_dir 
)

default handler for draw_slice() for video inputs

Definition at line 150 of file defaults.c.

Referenced by avfilter_draw_slice().

void avfilter_default_end_frame ( AVFilterLink link  ) 

default handler for end_frame() for video inputs

Definition at line 161 of file defaults.c.

Referenced by avfilter_end_frame().

void avfilter_default_filter_samples ( AVFilterLink link,
AVFilterBufferRef samplesref 
)

default handler for filter_samples() for audio inputs

Definition at line 181 of file defaults.c.

Referenced by avfilter_filter_samples().

AVFilterBufferRef* avfilter_default_get_audio_buffer ( AVFilterLink link,
int  perms,
enum AVSampleFormat  sample_fmt,
int  size,
int64_t  channel_layout,
int  planar 
)

default handler for get_audio_buffer() for audio inputs

Definition at line 58 of file defaults.c.

Referenced by avfilter_default_filter_samples(), avfilter_filter_samples(), and avfilter_get_audio_buffer().

AVFilterBufferRef* avfilter_default_get_video_buffer ( AVFilterLink link,
int  perms,
int  w,
int  h 
)

default handler for get_video_buffer() for video inputs

Definition at line 38 of file defaults.c.

Referenced by avfilter_get_video_buffer(), and get_video_buffer().

int avfilter_default_query_formats ( AVFilterContext ctx  ) 

Default handler for query_formats().

Definition at line 258 of file defaults.c.

Referenced by main(), and query_formats().

void avfilter_default_start_frame ( AVFilterLink link,
AVFilterBufferRef picref 
)

default handler for start_frame() for video inputs

Definition at line 136 of file defaults.c.

Referenced by avfilter_start_frame().

void avfilter_draw_slice ( AVFilterLink link,
int  y,
int  h,
int  slice_dir 
)

Send a slice to the next filter.

Slices have to be provided in sequential order, either in top-bottom or bottom-top order. If slices are provided in non-sequential order the behavior of the function is undefined.

Parameters:
link the output link over which the frame is being sent
y offset in pixels from the top of the image for this slice
h height of this slice in pixels
slice_dir the assumed direction for sending slices, from the top slice to the bottom slice if the value is 1, from the bottom slice to the top slice if the value is -1, for other values the behavior of the function is undefined.

Definition at line 442 of file avfilter.c.

Referenced by avfilter_default_draw_slice(), avfilter_null_draw_slice(), color_request_frame(), draw_send_bar_slice(), draw_slice(), end_frame(), request_frame(), and return_frame().

void avfilter_end_frame ( AVFilterLink link  ) 

Notifie the next filter that the current frame has finished.

Parameters:
link the output link the frame was sent over

Definition at line 425 of file avfilter.c.

Referenced by avfilter_default_end_frame(), avfilter_null_end_frame(), color_request_frame(), end_frame(), request_frame(), and return_frame().

void avfilter_filter_samples ( AVFilterLink link,
AVFilterBufferRef samplesref 
)

Send a buffer of audio samples to the next filter.

Parameters:
link the output link over which the audio samples are being sent
samplesref a reference to the buffer of audio samples being sent. The receiving filter will free this reference when it no longer needs it or pass it on to the next filter.

Definition at line 483 of file avfilter.c.

Referenced by avfilter_default_filter_samples(), and avfilter_null_filter_samples().

void avfilter_formats_changeref ( AVFilterFormats **  oldref,
AVFilterFormats **  newref 
)

Before After ________ ________ |formats |<---------.

|formats |<---------. | ____ | ___|___ | ____ | ___|___ | |refs| | | | | | |refs| | | | | NULL | |* *--------->|*oldref| | |* *--------->|*newref| ^ | |* * | | |_______| | |* * | | |_______| ___|___ | |____| | | |____| | | | | |________| |________| |*oldref| |_______|

Definition at line 158 of file formats.c.

Referenced by avfilter_insert_filter().

void avfilter_formats_ref ( AVFilterFormats formats,
AVFilterFormats **  ref 
)

Add *ref as a new reference to formats.

That is the pointers will point like in the ascii art below: ________ |formats |<--------. | ____ | ____|___________________ | |refs| | | __|_ | |* * | | | | | | AVFilterLink | |* *--------->|*ref| | |____| | | |____| |________| |________________________

Definition at line 121 of file formats.c.

Referenced by avfilter_set_common_formats(), and query_formats().

void avfilter_formats_unref ( AVFilterFormats **  ref  ) 

If *ref is non-NULL, remove *ref as a reference to the format list it currently points to, deallocates that list if this was the last reference, and sets *ref to NULL.

Before After ________ ________ NULL |formats |<--------. |formats | ^ | ____ | ____|________________ | ____ | ____|________________ | |refs| | | __|_ | |refs| | | __|_ | |* * | | | | | | AVFilterLink | |* * | | | | | | AVFilterLink | |* *--------->|*ref| | |* | | | |*ref| | |____| | | |____| | |____| | | |____| |________| |_____________________ |________| |_____________________

Definition at line 137 of file formats.c.

Referenced by avfilter_free(), pick_format(), and query_formats().

void avfilter_free ( AVFilterContext filter  ) 

Free a filter context.

Parameters:
filter the filter to free

Definition at line 610 of file avfilter.c.

Referenced by avfilter_graph_create_filter(), avfilter_graph_free(), avfilter_graph_parse(), create_filter(), and main().

AVFilterBufferRef* avfilter_get_audio_buffer ( AVFilterLink link,
int  perms,
enum AVSampleFormat  sample_fmt,
int  size,
int64_t  channel_layout,
int  planar 
)

Request an audio samples buffer with a specific set of permissions.

Parameters:
link the output link to the filter from which the buffer will be requested
perms the required access permissions
sample_fmt the format of each sample in the buffer to allocate
size the buffer size in bytes
channel_layout the number and type of channels per sample in the buffer to allocate
planar audio data layout - planar or packed
Returns:
A reference to the samples. This must be unreferenced with avfilter_unref_buffer when you are finished with it.

Definition at line 346 of file avfilter.c.

Referenced by avfilter_null_get_audio_buffer().

AVFilter* avfilter_get_by_name ( const char *  name  ) 

Get a filter definition matching the given name.

Parameters:
name the filter name to find
Returns:
the filter definition, if any matching one is registered. NULL if none found.

Definition at line 525 of file avfilter.c.

Referenced by create_filter(), main(), and query_formats().

AVFilterBufferRef* avfilter_get_video_buffer ( AVFilterLink link,
int  perms,
int  w,
int  h 
)

Request a picture buffer with a specific set of permissions.

Parameters:
link the output link to the filter from which the buffer will be requested
perms the required access permissions
w the minimum width of the buffer to allocate
h the minimum height of the buffer to allocate
Returns:
A reference to the buffer. This must be unreferenced with avfilter_unref_buffer when you are finished with it.

Definition at line 284 of file avfilter.c.

Referenced by avfilter_default_start_frame(), avfilter_null_get_video_buffer(), avfilter_start_frame(), color_request_frame(), get_video_buffer(), movie_get_frame(), request_frame(), return_frame(), source_request_frame(), and start_frame().

AVFilterBufferRef* avfilter_get_video_buffer_ref_from_arrays ( uint8_t *  data[4],
int  linesize[4],
int  perms,
int  w,
int  h,
enum PixelFormat  format 
)

Create a buffer reference wrapped around an already allocated image buffer.

Parameters:
data pointers to the planes of the image to reference
linesize linesizes for the planes of the image to reference
perms the required access permissions
w the width of the image specified by the data and linesize arrays
h the height of the image specified by the data and linesize arrays
format the pixel format of the image specified by the data and linesize arrays

Definition at line 307 of file avfilter.c.

Referenced by avfilter_default_get_video_buffer().

int avfilter_init_filter ( AVFilterContext filter,
const char *  args,
void *  opaque 
)

Initialize a filter.

Parameters:
filter the filter to initialize
args A string of parameters to use when initializing the filter. The format and meaning of this string varies by filter.
opaque Any extra non-string data needed by the filter. The meaning of this parameter varies by filter.
Returns:
zero on success

Definition at line 646 of file avfilter.c.

Referenced by avfilter_graph_create_filter(), create_filter(), and main().

int avfilter_insert_filter ( AVFilterLink link,
AVFilterContext filt,
unsigned  filt_srcpad_idx,
unsigned  filt_dstpad_idx 
)

Insert a filter in the middle of an existing link.

Parameters:
link the link into which the filter should be inserted
filt the filter to be inserted
filt_srcpad_idx the input pad on the filter to connect
filt_dstpad_idx the output pad on the filter to connect
Returns:
zero on success

Definition at line 134 of file avfilter.c.

Referenced by query_formats().

static void avfilter_insert_inpad ( AVFilterContext f,
unsigned  index,
AVFilterPad p 
) [inline, static]

Insert a new input pad for the filter.

Definition at line 845 of file avfilter.h.

static void avfilter_insert_outpad ( AVFilterContext f,
unsigned  index,
AVFilterPad p 
) [inline, static]

Insert a new output pad for the filter.

Definition at line 853 of file avfilter.h.

void avfilter_insert_pad ( unsigned  idx,
unsigned *  count,
size_t  padidx_off,
AVFilterPad **  pads,
AVFilterLink ***  links,
AVFilterPad newpad 
)

Insert a new pad.

Parameters:
idx Insertion point. Pad is inserted at the end if this point is beyond the end of the list of pads.
count Pointer to the number of pads in the list
padidx_off Offset within an AVFilterLink structure to the element to increment when inserting a new pad causes link numbering to change
pads Pointer to the pointer to the beginning of the list of pads
links Pointer to the pointer to the beginning of the list of links
newpad The new pad to add. A copy is made when adding.

Definition at line 83 of file avfilter.c.

Referenced by avfilter_insert_inpad(), and avfilter_insert_outpad().

const char* avfilter_license ( void   ) 

Return the libavfilter license.

Definition at line 40 of file avfilter.c.

int avfilter_link ( AVFilterContext src,
unsigned  srcpad,
AVFilterContext dst,
unsigned  dstpad 
)

Link two filters together.

Parameters:
src the source filter
srcpad index of the output pad on the source filter
dst the destination filter
dstpad index of the input pad on the destination filter
Returns:
zero on success

Definition at line 104 of file avfilter.c.

Referenced by avfilter_insert_filter(), and link_filter().

AVFilterFormats* avfilter_make_format_list ( const int *  fmts  ) 

Create a list of supported formats.

This is intended for use in AVFilter->query_formats().

Parameters:
fmts list of media formats, terminated by -1
Returns:
the format list, with no existing references

Definition at line 73 of file formats.c.

Referenced by query_formats().

AVFilterFormats* avfilter_merge_formats ( AVFilterFormats a,
AVFilterFormats b 
)

Return a format list which contains the intersection of the formats of a and b.

Also, all the references of a, all the references of b, and a and b themselves will be deallocated.

If a and b do not share any common formats, neither is modified, and NULL is returned.

Definition at line 42 of file formats.c.

Referenced by query_formats().

void avfilter_null_draw_slice ( AVFilterLink link,
int  y,
int  h,
int  slice_dir 
)

draw_slice() handler for filters which simply pass video along

Definition at line 273 of file defaults.c.

void avfilter_null_end_frame ( AVFilterLink link  ) 

end_frame() handler for filters which simply pass video along

Definition at line 278 of file defaults.c.

void avfilter_null_filter_samples ( AVFilterLink link,
AVFilterBufferRef samplesref 
)

filter_samples() handler for filters which simply pass audio along

Definition at line 283 of file defaults.c.

AVFilterBufferRef* avfilter_null_get_audio_buffer ( AVFilterLink link,
int  perms,
enum AVSampleFormat  sample_fmt,
int  size,
int64_t  channel_layout,
int  planar 
)

get_audio_buffer() handler for filters which simply pass audio along

Definition at line 293 of file defaults.c.

AVFilterBufferRef* avfilter_null_get_video_buffer ( AVFilterLink link,
int  perms,
int  w,
int  h 
)

get_video_buffer() handler for filters which simply pass video along

Definition at line 288 of file defaults.c.

void avfilter_null_start_frame ( AVFilterLink link,
AVFilterBufferRef picref 
)

start_frame() handler for filters which simply pass video along

Definition at line 268 of file defaults.c.

int avfilter_open ( AVFilterContext **  filter_ctx,
AVFilter filter,
const char *  inst_name 
)

Create a filter instance.

Parameters:
filter_ctx put here a pointer to the created filter context on success, NULL on failure
filter the filter to create an instance of
inst_name Name to give to the new instance. Can be NULL for none.
Returns:
>= 0 in case of success, a negative error code otherwise

Definition at line 577 of file avfilter.c.

Referenced by avfilter_graph_create_filter(), create_filter(), and main().

int avfilter_poll_frame ( AVFilterLink link  ) 

Poll a frame from the filter chain.

Parameters:
link the input link
Returns:
the number of immediately available frames, a negative number in case of error

Definition at line 375 of file avfilter.c.

Referenced by avfilter_poll_frame(), output_packet(), and poll_frame().

AVFilterBufferRef* avfilter_ref_buffer ( AVFilterBufferRef ref,
int  pmask 
)

Add a new reference to a buffer.

Parameters:
ref an existing reference to the buffer
pmask a bitmask containing the allowable permissions in the new reference
Returns:
a new reference to the buffer with the same properties as the old, excluding any permissions denied by pmask

Definition at line 46 of file avfilter.c.

Referenced by avfilter_default_filter_samples(), avfilter_default_start_frame(), color_request_frame(), request_frame(), source_request_frame(), and start_frame().

int avfilter_register ( AVFilter filter  ) 

Register a filter.

This is only needed if you plan to use avfilter_get_by_name later to lookup the AVFilter structure by name. A filter can still by instantiated with avfilter_open even if it is not registered.

Parameters:
filter the filter to register
Returns:
0 if the registration was succesfull, a negative value otherwise

Definition at line 536 of file avfilter.c.

void avfilter_register_all ( void   ) 

Initialize the filter system.

Register all builtin filters.

Definition at line 29 of file allfilters.c.

Referenced by main().

int avfilter_request_frame ( AVFilterLink link  ) 

Request an input frame from the filter at the other end of the link.

Parameters:
link the input link
Returns:
zero on success

Definition at line 364 of file avfilter.c.

Referenced by avfilter_request_frame(), poll_frame(), request_frame(), and start_frame().

void avfilter_set_common_formats ( AVFilterContext ctx,
AVFilterFormats formats 
)

A helper for query_formats() which sets all links to the same list of formats.

If there are no links hooked to this filter, the list of formats is freed.

If there are no links hooked to this filter, the list of formats is freed.

FIXME: this will need changed for filters with a mix of pad types (video + audio, etc)

Definition at line 234 of file defaults.c.

Referenced by avfilter_default_query_formats(), and query_formats().

void avfilter_start_frame ( AVFilterLink link,
AVFilterBufferRef picref 
)

Notifie the next filter of the start of a frame.

Parameters:
link the output link the frame will be sent over
picref A reference to the frame about to be sent. The data for this frame need only be valid once draw_slice() is called for that portion. The receiving filter will free this reference when it no longer needs it.

Definition at line 395 of file avfilter.c.

Referenced by avfilter_default_start_frame(), avfilter_null_start_frame(), color_request_frame(), request_frame(), return_frame(), source_request_frame(), and start_frame().

void avfilter_uninit ( void   ) 

Uninitialize the filter system.

Unregister all filters.

Definition at line 550 of file avfilter.c.

Referenced by do_exit(), and ffmpeg_exit().

void avfilter_unref_buffer ( AVFilterBufferRef ref  ) 

Remove a reference to a buffer.

If this is the last reference to the buffer, the buffer itself is also automatically freed.

Parameters:
ref reference to the buffer, may be NULL

Definition at line 72 of file avfilter.c.

Referenced by alloc_picture(), avfilter_default_end_frame(), avfilter_default_filter_samples(), avfilter_end_frame(), avfilter_filter_samples(), color_request_frame(), end_frame(), output_packet(), queue_picture(), request_frame(), start_frame(), stream_close(), and uninit().

unsigned avfilter_version ( void   ) 

Return the LIBAVFILTER_VERSION_INT constant.

Definition at line 31 of file avfilter.c.


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