FFmpeg
Macros | Functions | Variables
vf_signature.c File Reference

MPEG-7 video signature calculation and lookup filter. More...

#include <float.h>
#include "libavcodec/put_bits.h"
#include "libavformat/avformat.h"
#include "libavutil/opt.h"
#include "libavutil/avstring.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/timestamp.h"
#include "avfilter.h"
#include "internal.h"
#include "signature.h"
#include "signature_lookup.c"

Go to the source code of this file.

Macros

#define OFFSET(x)   offsetof(SignatureContext, x)
 
#define FLAGS   AV_OPT_FLAG_FILTERING_PARAM | AV_OPT_FLAG_VIDEO_PARAM
 
#define BLOCK_LCM   (int64_t) 476985600
 

Functions

 AVFILTER_DEFINE_CLASS (signature)
 
static int query_formats (AVFilterContext *ctx)
 
static int config_input (AVFilterLink *inlink)
 
static int get_block_size (const Block *b)
 
static uint64_t get_block_sum (StreamContext *sc, uint64_t intpic[32][32], const Block *b)
 
static int cmp (const uint64_t *a, const uint64_t *b)
 
static void set_bit (uint8_t *data, size_t pos)
 sets the bit at position pos to 1 in data More...
 
static int filter_frame (AVFilterLink *inlink, AVFrame *picref)
 
static int xml_export (AVFilterContext *ctx, StreamContext *sc, const char *filename)
 
static int binary_export (AVFilterContext *ctx, StreamContext *sc, const char *filename)
 
static int export (AVFilterContext *ctx, StreamContext *sc, int input)
 
static int request_frame (AVFilterLink *outlink)
 
static av_cold int init (AVFilterContext *ctx)
 
static av_cold void uninit (AVFilterContext *ctx)
 
static int config_output (AVFilterLink *outlink)
 

Variables

static const AVOption signature_options []
 
static const AVFilterPad signature_outputs []
 
AVFilter ff_vf_signature
 

Detailed Description

MPEG-7 video signature calculation and lookup filter.

See also
http://epubs.surrey.ac.uk/531590/1/MPEG-7%20Video%20Signature%20Author%27s%20Copy.pdf

Definition in file vf_signature.c.

Macro Definition Documentation

#define OFFSET (   x)    offsetof(SignatureContext, x)

Definition at line 39 of file vf_signature.c.

Definition at line 40 of file vf_signature.c.

#define BLOCK_LCM   (int64_t) 476985600

Definition at line 41 of file vf_signature.c.

Referenced by config_input(), and filter_frame().

Function Documentation

AVFILTER_DEFINE_CLASS ( signature  )
static int query_formats ( AVFilterContext ctx)
static

Definition at line 72 of file vf_signature.c.

static int config_input ( AVFilterLink inlink)
static

Definition at line 90 of file vf_signature.c.

Referenced by init().

static int get_block_size ( const Block b)
static

Definition at line 107 of file vf_signature.c.

Referenced by filter_frame().

static uint64_t get_block_sum ( StreamContext sc,
uint64_t  intpic[32][32],
const Block b 
)
static

Definition at line 112 of file vf_signature.c.

Referenced by filter_frame().

static int cmp ( const uint64_t *  a,
const uint64_t *  b 
)
static

Definition at line 135 of file vf_signature.c.

Referenced by filter_frame().

static void set_bit ( uint8_t data,
size_t  pos 
)
static

sets the bit at position pos to 1 in data

Definition at line 143 of file vf_signature.c.

Referenced by filter_frame().

static int filter_frame ( AVFilterLink inlink,
AVFrame picref 
)
static

Definition at line 149 of file vf_signature.c.

Referenced by init().

static int xml_export ( AVFilterContext ctx,
StreamContext sc,
const char *  filename 
)
static

Definition at line 385 of file vf_signature.c.

Referenced by export().

static int binary_export ( AVFilterContext ctx,
StreamContext sc,
const char *  filename 
)
static

Definition at line 491 of file vf_signature.c.

Referenced by export().

static int export ( AVFilterContext ctx,
StreamContext sc,
int  input 
)
static

Definition at line 570 of file vf_signature.c.

Referenced by request_frame().

static int request_frame ( AVFilterLink outlink)
static

Definition at line 589 of file vf_signature.c.

static av_cold int init ( AVFilterContext ctx)
static

Definition at line 645 of file vf_signature.c.

static av_cold void uninit ( AVFilterContext ctx)
static

Definition at line 701 of file vf_signature.c.

static int config_output ( AVFilterLink outlink)
static

Definition at line 736 of file vf_signature.c.

Variable Documentation

const AVOption signature_options[]
static
Initial value:
= {
{ "detectmode", "set the detectmode",
OFFSET(mode), AV_OPT_TYPE_INT, {.i64 = MODE_OFF}, 0, NB_LOOKUP_MODE-1, FLAGS, "mode" },
{ "off", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = MODE_OFF}, 0, 0, .flags = FLAGS, "mode" },
{ "full", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = MODE_FULL}, 0, 0, .flags = FLAGS, "mode" },
{ "fast", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = MODE_FAST}, 0, 0, .flags = FLAGS, "mode" },
{ "nb_inputs", "number of inputs",
OFFSET(nb_inputs), AV_OPT_TYPE_INT, {.i64 = 1}, 1, INT_MAX, FLAGS },
{ "filename", "filename for output files",
OFFSET(filename), AV_OPT_TYPE_STRING, {.str = ""}, 0, NB_FORMATS-1, FLAGS },
{ "format", "set output format",
OFFSET(format), AV_OPT_TYPE_INT, {.i64 = FORMAT_BINARY}, 0, 1, FLAGS , "format" },
{ "binary", 0, 0, AV_OPT_TYPE_CONST, {.i64=FORMAT_BINARY}, 0, 0, FLAGS, "format" },
{ "xml", 0, 0, AV_OPT_TYPE_CONST, {.i64=FORMAT_XML}, 0, 0, FLAGS, "format" },
{ "th_d", "threshold to detect one word as similar",
OFFSET(thworddist), AV_OPT_TYPE_INT, {.i64 = 9000}, 1, INT_MAX, FLAGS },
{ "th_dc", "threshold to detect all words as similar",
OFFSET(thcomposdist), AV_OPT_TYPE_INT, {.i64 = 60000}, 1, INT_MAX, FLAGS },
{ "th_xh", "threshold to detect frames as similar",
OFFSET(thl1), AV_OPT_TYPE_INT, {.i64 = 116}, 1, INT_MAX, FLAGS },
{ "th_di", "minimum length of matching sequence in frames",
OFFSET(thdi), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, FLAGS },
{ "th_it", "threshold for relation of good to all frames",
OFFSET(thit), AV_OPT_TYPE_DOUBLE, {.dbl = 0.5}, 0.0, 1.0, FLAGS },
{ NULL }
}
#define NULL
Definition: coverity.c:32
#define OFFSET(x)
Definition: vf_signature.c:39
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 format(the sample packing is implied by the sample format) and sample rate.The lists are not just lists
#define FLAGS
Definition: vf_signature.c:40
mode
Use these values in ebur128_init (or&#39;ed).
Definition: ebur128.h:83

Definition at line 43 of file vf_signature.c.

const AVFilterPad signature_outputs[]
static
Initial value:
= {
{
.name = "default",
.request_frame = request_frame,
.config_props = config_output,
},
{ NULL }
}
#define NULL
Definition: coverity.c:32
static int config_output(AVFilterLink *outlink)
Definition: vf_signature.c:736
static int request_frame(AVFilterLink *outlink)
Definition: vf_signature.c:589

Definition at line 750 of file vf_signature.c.

AVFilter ff_vf_signature
Initial value:
= {
.name = "signature",
.description = NULL_IF_CONFIG_SMALL("Calculate the MPEG-7 video signature"),
.priv_size = sizeof(SignatureContext),
.priv_class = &signature_class,
.init = init,
}
#define NULL
Definition: coverity.c:32
static const AVFilterPad signature_outputs[]
Definition: vf_signature.c:750
#define AVFILTER_FLAG_DYNAMIC_INPUTS
The number of the filter inputs is not determined just by AVFilter.inputs.
Definition: avfilter.h:105
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
static const AVFilterPad outputs[]
Definition: af_acontrast.c:203
static av_cold void uninit(AVFilterContext *ctx)
Definition: vf_signature.c:701
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 inputs
#define flags(name, subs,...)
Definition: cbs_av1.c:561
static int query_formats(AVFilterContext *ctx)
Definition: vf_signature.c:72
static av_cold int init(AVFilterContext *ctx)
Definition: vf_signature.c:645

Definition at line 760 of file vf_signature.c.