32 #define MAX_FRAMES 240 34 #define NUM_CHANNELS 3 58 #define OFFSET(x) offsetof(PhotosensitivityContext, x) 59 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM 64 {
"threshold",
"set detection threshold factor (lower is stricter)",
OFFSET(threshold_multiplier),
AV_OPT_TYPE_FLOAT, {.dbl=1}, 0.1, FLT_MAX, FLAGS },
65 {
"t",
"set detection threshold factor (lower is stricter)",
OFFSET(threshold_multiplier),
AV_OPT_TYPE_FLOAT, {.dbl=1}, 0.1, FLT_MAX, FLAGS },
66 {
"skip",
"set pixels to skip when sampling frames",
OFFSET(skip),
AV_OPT_TYPE_INT, {.i64=1}, 1, 1024, FLAGS },
93 #define NUM_CELLS (GRID_SIZE * GRID_SIZE) 97 int cell, gx, gy, x0, x1, y0, y1, x, y,
c, area;
103 const int slice_start = (
NUM_CELLS * jobnr) / nb_jobs;
109 for (cell = slice_start; cell <
slice_end; cell++) {
121 for (y = y0; y < y1; y += skip) {
123 for (x = x0; x < x1; x += skip) {
128 p += NUM_CHANNELS * skip;
133 area = ((x1 - x0 + skip - 1) / skip) * ((y1 - y0 + skip - 1) / skip);
165 const uint16_t s_mul = td->
s_mul;
166 const uint16_t t_mul = 0x100 - s_mul;
167 const int slice_start = (td->
target->
height * jobnr) / nb_jobs;
171 for (y = slice_start; y <
slice_end; y++) {
174 for (x = 0; x < linesize; x++) {
175 *t = (*t * t_mul + *s * s_mul) >> 8;
187 td.
s_mul = (uint16_t)(factor * 0x100);
193 int badness, x, y,
c;
198 badness +=
abs((
int)a->
grid[y][x][c] - (
int)b->
grid[y][x][c]);
220 int this_badness, current_badness, fixed_badness, new_badness,
i, res;
239 new_badness = current_badness + this_badness;
242 100 * new_badness / s->
badness_threshold, new_badness < s->badness_threshold ?
"OK" :
"EXCEEDED");
244 fixed_badness = new_badness;
252 factor = (float)(s->
badness_threshold - current_badness) / (new_badness - current_badness);
266 fixed_badness = current_badness + this_badness;
290 av_dict_set(metadata,
"lavfi.photosensitivity.badness", value, 0);
293 av_dict_set(metadata,
"lavfi.photosensitivity.fixed-badness", value, 0);
296 av_dict_set(metadata,
"lavfi.photosensitivity.frame-badness", value, 0);
298 snprintf(value,
sizeof(value),
"%f", factor);
299 av_dict_set(metadata,
"lavfi.photosensitivity.factor", value, 0);
333 .
name =
"photosensitivity",
334 .description =
NULL_IF_CONFIG_SMALL(
"Filter out photosensitive epilepsy seizure-inducing flashes."),
336 .priv_class = &photosensitivity_class,
static int query_formats(AVFilterContext *ctx)
static void convert_frame(AVFilterContext *ctx, AVFrame *in, PhotosensitivityFrame *out, int skip)
This structure describes decoded (raw) audio or video data.
PhotosensitivityFrame last_frame_e
ptrdiff_t const GLvoid * data
Main libavfilter public API header.
packed RGB 8:8:8, 24bpp, RGBRGB...
int h
agreed upon image height
static void blend_frame(AVFilterContext *ctx, AVFrame *target, AVFrame *source, float factor)
The reader does not expect b to be semantically here and if the code is changed by maybe adding a a division or other the signedness will almost certainly be mistaken To avoid this confusion a new type was SUINT is the C unsigned type but it holds a signed int to use the same example SUINT a
static const AVOption photosensitivity_options[]
float threshold_multiplier
static int config_input(AVFilterLink *inlink)
AVFrame * ff_get_video_buffer(AVFilterLink *link, int w, int h)
Request a picture buffer with a specific set of permissions.
static const AVFilterPad inputs[]
const char * name
Pad name.
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
uint8_t grid[GRID_SIZE][GRID_SIZE][4]
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
GLsizei GLboolean const GLfloat * value
#define AV_LOG_VERBOSE
Detailed information.
PhotosensitivityFrame * out
AVDictionary * metadata
metadata.
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 source
A filter pad used for either input or output.
A link between two filters.
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
void * priv
private data for use by the filter
static int blend_frame_partial(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
static int get_badness(PhotosensitivityFrame *a, PhotosensitivityFrame *b)
int av_frame_copy(AVFrame *dst, const AVFrame *src)
Copy the frame data from src to dst.
AVFilter ff_vf_photosensitivity
int ff_filter_get_nb_threads(AVFilterContext *ctx)
Get number of threads for current filter instance.
In the ELBG jargon, a cell is the set of points that are closest to a codebook entry.
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
static av_cold void uninit(AVFilterContext *ctx)
packed RGB 8:8:8, 24bpp, BGRBGR...
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
int av_dict_set(AVDictionary **pm, const char *key, const char *value, int flags)
Set the given entry in *pm, overwriting an existing entry.
uint8_t pi<< 24) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_U8, uint8_t,(*(const uint8_t *) pi-0x80)*(1.0f/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_U8, uint8_t,(*(const uint8_t *) pi-0x80)*(1.0/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S16, int16_t,(*(const int16_t *) pi >> 8)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S16, int16_t,*(const int16_t *) pi *(1.0f/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S16, int16_t,*(const int16_t *) pi *(1.0/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S32, int32_t,(*(const int32_t *) pi >> 24)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S32, int32_t,*(const int32_t *) pi *(1.0f/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S32, int32_t,*(const int32_t *) pi *(1.0/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_FLT, float, av_clip_uint8(lrintf(*(const float *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_FLT, float, av_clip_int16(lrintf(*(const float *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_FLT, float, av_clipl_int32(llrintf(*(const float *) pi *(1U<< 31)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_DBL, double, av_clip_uint8(lrint(*(const double *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_DBL, double, av_clip_int16(lrint(*(const double *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_DBL, double, av_clipl_int32(llrint(*(const double *) pi *(1U<< 31))))#define SET_CONV_FUNC_GROUP(ofmt, ifmt) static void set_generic_function(AudioConvert *ac){}void ff_audio_convert_free(AudioConvert **ac){if(!*ac) return;ff_dither_free(&(*ac) ->dc);av_freep(ac);}AudioConvert *ff_audio_convert_alloc(AVAudioResampleContext *avr, enum AVSampleFormat out_fmt, enum AVSampleFormat in_fmt, int channels, int sample_rate, int apply_map){AudioConvert *ac;int in_planar, out_planar;ac=av_mallocz(sizeof(*ac));if(!ac) return NULL;ac->avr=avr;ac->out_fmt=out_fmt;ac->in_fmt=in_fmt;ac->channels=channels;ac->apply_map=apply_map;if(avr->dither_method!=AV_RESAMPLE_DITHER_NONE &&av_get_packed_sample_fmt(out_fmt)==AV_SAMPLE_FMT_S16 &&av_get_bytes_per_sample(in_fmt) > 2){ac->dc=ff_dither_alloc(avr, out_fmt, in_fmt, channels, sample_rate, apply_map);if(!ac->dc){av_free(ac);return NULL;}return ac;}in_planar=ff_sample_fmt_is_planar(in_fmt, channels);out_planar=ff_sample_fmt_is_planar(out_fmt, channels);if(in_planar==out_planar){ac->func_type=CONV_FUNC_TYPE_FLAT;ac->planes=in_planar?ac->channels:1;}else if(in_planar) ac->func_type=CONV_FUNC_TYPE_INTERLEAVE;else ac->func_type=CONV_FUNC_TYPE_DEINTERLEAVE;set_generic_function(ac);if(ARCH_AARCH64) ff_audio_convert_init_aarch64(ac);if(ARCH_ARM) ff_audio_convert_init_arm(ac);if(ARCH_X86) ff_audio_convert_init_x86(ac);return ac;}int ff_audio_convert(AudioConvert *ac, AudioData *out, AudioData *in){int use_generic=1;int len=in->nb_samples;int p;if(ac->dc){av_log(ac->avr, AV_LOG_TRACE,"%d samples - audio_convert: %s to %s (dithered)\n", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt));return ff_convert_dither(ac-> in
Describe the class of an AVClass context structure.
AVFILTER_DEFINE_CLASS(photosensitivity)
static const AVFilterPad outputs[]
static const int factor[16]
const char * name
Filter name.
static int convert_frame_partial(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
AVFilterLink ** outputs
array of pointers to output links
int av_frame_make_writable(AVFrame *frame)
Ensure that the frame data is writable, avoiding data copy if possible.
AVFilterInternal * internal
An opaque struct for libavfilter internal use.
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
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
avfilter_execute_func * execute
static int slice_end(AVCodecContext *avctx, AVFrame *pict)
Handle slice ends.
AVFilterContext * dst
dest filter
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
AVPixelFormat
Pixel format.
int av_frame_copy_props(AVFrame *dst, const AVFrame *src)
Copy only "metadata" fields from src to dst.