#include "libavutil/avutil.h"
#include "libavutil/log.h"
#include "libavutil/samplefmt.h"
#include "libavutil/pixfmt.h"
#include "libavutil/rational.h"
#include "libavcodec/avcodec.h"
#include <stddef.h>
#include "libavfilter/version.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... |
Macros | |
#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 |
typedef struct AVFilterBuffer | AVFilterBuffer |
A reference-counted buffer data type used by the filter system. | |
typedef struct AVFilterBufferRefAudioProps | AVFilterBufferRefAudioProps |
Audio specific properties in a reference to an AVFilterBuffer. | |
typedef struct AVFilterBufferRefVideoProps | AVFilterBufferRefVideoProps |
Video specific properties in a reference to an AVFilterBuffer. | |
typedef struct AVFilterBufferRef | AVFilterBufferRef |
A reference to an AVFilterBuffer. | |
typedef struct AVFilterFormats | AVFilterFormats |
A list of supported formats for one end of a filter link. | |
typedef struct AVFilter | AVFilter |
Filter definition. |
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. | |
AVFilterBufferRef * | avfilter_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. | |
AVFilterFormats * | avfilter_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. | |
AVFilterFormats * | avfilter_all_formats (enum AVMediaType type) |
Return a list of all formats supported by Libav for the given media type. | |
AVFilterFormats * | avfilter_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 | |
AVFilterBufferRef * | avfilter_default_get_video_buffer (AVFilterLink *link, int perms, int w, int h) |
default handler for get_video_buffer() for video inputs | |
AVFilterBufferRef * | avfilter_default_get_audio_buffer (AVFilterLink *link, int perms, enum AVSampleFormat sample_fmt, int size, uint64_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 | |
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 | |
AVFilterBufferRef * | avfilter_null_get_audio_buffer (AVFilterLink *link, int perms, enum AVSampleFormat sample_fmt, int size, uint64_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. | |
AVFilterBufferRef * | avfilter_get_video_buffer (AVFilterLink *link, int perms, int w, int h) |
Request a picture buffer with a specific set of permissions. | |
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. | |
AVFilterBufferRef * | avfilter_get_audio_buffer (AVFilterLink *link, int perms, enum AVSampleFormat sample_fmt, int size, uint64_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) |
Notify 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. | |
AVFilter * | avfilter_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. | |
int | avfilter_copy_frame_props (AVFilterBufferRef *dst, const AVFrame *src) |
Copy the frame properties of src to dst, without copying the actual image data. |
#define AV_PERM_NEG_LINESIZES 0x20 |
the buffer requested can have negative linesizes
Definition at line 86 of file avfilter.h.
Referenced by avfilter_start_frame(), get_video_buffer(), and start_frame().
#define AV_PERM_PRESERVE 0x04 |
nobody else can overwrite the buffer
Definition at line 83 of file avfilter.h.
Referenced by movie_get_frame(), return_frame(), start_frame(), and transcode_video().
#define AV_PERM_READ 0x01 |
can read from the buffer
Definition at line 81 of file avfilter.h.
Referenced by avfilter_default_get_audio_buffer(), avfilter_get_video_buffer_ref_from_arrays(), start_frame(), and transcode_video().
#define AV_PERM_REUSE 0x08 |
can output the buffer multiple times, with the same contents each time
Definition at line 84 of file avfilter.h.
Referenced by return_frame(), and start_frame().
#define AV_PERM_REUSE2 0x10 |
can output the buffer multiple times, modified each time
Definition at line 85 of file avfilter.h.
Referenced by movie_get_frame().
#define AV_PERM_WRITE 0x02 |
can write to the buffer
Definition at line 82 of file avfilter.h.
Referenced by av_vsrc_buffer_add_frame(), avfilter_default_filter_samples(), avfilter_default_start_frame(), color_request_frame(), movie_get_frame(), request_frame(), return_frame(), source_request_frame(), and start_frame().
Filter definition.
This defines the pads a filter contains, and all the callback functions used to interact with the filter.
typedef struct AVFilterBuffer AVFilterBuffer |
A reference-counted buffer data type used by the filter system.
Filters should not store pointers to this structure directly, but instead use the AVFilterBufferRef structure below.
typedef struct AVFilterBufferRef AVFilterBufferRef |
A reference to an AVFilterBuffer.
Since filters can manipulate the origin of a buffer to, for example, crop image without any memcpy, the buffer origin and dimensions are per-reference properties. Linesize is also useful for image flipping, frame to field filters, etc, and so is also per-reference.
TODO: add anything necessary for frame reordering
typedef struct AVFilterBufferRefAudioProps AVFilterBufferRefAudioProps |
Audio specific properties in a reference to an AVFilterBuffer.
Since AVFilterBufferRef is common to different media formats, audio specific per reference properties must be separated out.
typedef struct AVFilterBufferRefVideoProps AVFilterBufferRefVideoProps |
Video specific properties in a reference to an AVFilterBuffer.
Since AVFilterBufferRef is common to different media formats, video specific per reference properties must be separated out.
typedef struct AVFilterContext AVFilterContext |
Definition at line 52 of file avfilter.h.
typedef struct AVFilterFormats AVFilterFormats |
A list of supported formats for one end of a filter link.
This is used during the format negotiation process to try to pick the best format to use to minimize the number of necessary conversions. Each filter gives a list of the formats supported by each input and output pad. The list given for each pad need not be distinct - they may be references to the same list of formats, as is often the case when a filter supports multiple formats, but will always output the same format as it is given in input.
In this way, a list of possible input formats and a list of possible output formats are associated with each link. When a set of formats is negotiated over a link, the input and output lists are merged to form a new list containing only the common elements of each list. In the case that there were no common elements, a format conversion is necessary. Otherwise, the lists are merged, and all other links which reference either of the format lists involved in the merge are also affected.
For example, consider the filter chain: filter (a) –> (b) filter (b) –> (c) filter
where the letters in parenthesis indicate a list of formats supported on the input or output of the link. Suppose the lists are as follows: (a) = {A, B} (b) = {A, B, C} (c) = {B, C}
First, the first link's lists are merged, yielding: filter (a) –> (a) filter (a) –> (c) filter
Notice that format list (b) now refers to the same list as filter list (a). Next, the lists for the second link are merged, yielding: filter (a) –> (a) filter (a) –> (a) filter
where (a) = {B}.
Unfortunately, when the format lists at the two ends of a link are merged, we must ensure that all links which reference either pre-merge format list get updated as well. Therefore, we have the format list structure store a pointer to each of the pointers to itself.
typedef struct AVFilterLink AVFilterLink |
Definition at line 53 of file avfilter.h.
typedef struct AVFilterPad AVFilterPad |
Definition at line 54 of file avfilter.h.
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 550 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.
Definition at line 107 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 Libav for the given media type.
Definition at line 124 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.
filter | the filter to negotiate the properties for its inputs |
Definition at line 166 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 36 of file avfilter.c.
|
inlinestatic |
Copy properties of src to dst, without copying the actual data.
Definition at line 148 of file avfilter.h.
Referenced by avfilter_default_start_frame(), avfilter_start_frame(), return_frame(), and start_frame().
int avfilter_copy_frame_props | ( | AVFilterBufferRef * | dst, |
const AVFrame * | src | ||
) |
Copy the frame properties of src to dst, without copying the actual image data.
Definition at line 685 of file avfilter.c.
Referenced by av_vsrc_buffer_add_frame(), movie_get_frame(), and transcode_video().
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, | ||
uint64_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.
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 447 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.
link | the output link the frame was sent over |
Definition at line 430 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.
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 488 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 |<---------.
| ____ | ___|___ | ____ | ___|___ | |refs| | | | | | |refs| | | | | NULL | |* *------—>|*oldref| | |* *------—>|*newref| ^ | |* * | | |_______| | |* * | | |_______| ___|___ | |____| | | |____| | | | | |________| |________| |*oldref| |_______|
Definition at line 176 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:
Definition at line 139 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 155 of file formats.c.
Referenced by avfilter_free(), pick_format(), and query_formats().
void avfilter_free | ( | AVFilterContext * | filter | ) |
Free a filter context.
filter | the filter to free |
Definition at line 640 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, | ||
uint64_t | channel_layout, | ||
int | planar | ||
) |
Request an audio samples buffer with a specific set of permissions.
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 |
Definition at line 351 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.
name | the filter name to find |
Definition at line 530 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.
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 |
Definition at line 289 of file avfilter.c.
Referenced by av_vsrc_buffer_add_frame(), 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.
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 312 of file avfilter.c.
Referenced by avfilter_default_get_video_buffer(), and transcode_video().
int avfilter_init_filter | ( | AVFilterContext * | filter, |
const char * | args, | ||
void * | opaque | ||
) |
Initialize a filter.
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. |
Definition at line 676 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.
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 |
Definition at line 135 of file avfilter.c.
Referenced by query_formats().
|
inlinestatic |
Insert a new input pad for the filter.
Definition at line 842 of file avfilter.h.
|
inlinestatic |
Insert a new output pad for the filter.
Definition at line 850 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.
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 84 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 41 of file avfilter.c.
int avfilter_link | ( | AVFilterContext * | src, |
unsigned | srcpad, | ||
AVFilterContext * | dst, | ||
unsigned | dstpad | ||
) |
Link two filters together.
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 |
Definition at line 105 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().
fmts | list of media formats, terminated by -1 |
Definition at line 90 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 43 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, | ||
uint64_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.
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. |
Definition at line 582 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.
link | the input link |
Definition at line 380 of file avfilter.c.
Referenced by avfilter_poll_frame(), output_packet(), poll_frame(), and transcode_video().
AVFilterBufferRef* avfilter_ref_buffer | ( | AVFilterBufferRef * | ref, |
int | pmask | ||
) |
Add a new reference to a buffer.
ref | an existing reference to the buffer |
pmask | a bitmask containing the allowable permissions in the new reference |
Definition at line 47 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.
filter | the filter to register |
Definition at line 541 of file avfilter.c.
Referenced by avfilter_register_all().
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.
link | the input link |
Definition at line 369 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 | ||
) |
Notify the next filter of the start of a frame.
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 400 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().
Uninitialize the filter system.
Unregister all filters.
Definition at line 555 of file avfilter.c.
Referenced by do_exit(), and exit_program().
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.
ref | reference to the buffer, may be NULL |
Definition at line 73 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(), transcode_video(), and uninit().
unsigned avfilter_version | ( | void | ) |
Return the LIBAVFILTER_VERSION_INT constant.
Definition at line 32 of file avfilter.c.