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54 #define OFFSET(x) offsetof(BlackDetectContext, x)
55 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
59 {
"black_min_duration",
"set minimum detected black duration in seconds",
OFFSET(black_min_duration_time),
AV_OPT_TYPE_DOUBLE, {.dbl=2}, 0, DBL_MAX,
FLAGS },
60 {
"picture_black_ratio_th",
"set the picture black ratio threshold",
OFFSET(picture_black_ratio_th),
AV_OPT_TYPE_DOUBLE, {.dbl=.98}, 0, 1,
FLAGS },
69 #define YUVJ_FORMATS \
70 AV_PIX_FMT_YUVJ411P, AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P
112 const int depth =
desc->comp[0].depth;
113 const int max = (1 << depth) - 1;
114 const int factor = (1 << (depth - 8));
118 s->time_base =
inlink->time_base;
119 s->black_min_duration =
s->black_min_duration_time /
av_q2d(
s->time_base);
120 s->counter =
av_calloc(
s->nb_threads,
sizeof(*
s->counter));
126 s->pixel_black_th *
max :
130 "black_min_duration:%s pixel_black_th:%f pixel_black_th_i:%d picture_black_ratio_th:%f\n",
132 s->pixel_black_th,
s->pixel_black_th_i,
133 s->picture_black_ratio_th);
141 if ((
s->black_end -
s->black_start) >=
s->black_min_duration) {
143 "black_start:%s black_end:%s black_duration:%s\n",
151 int jobnr,
int nb_jobs)
154 const unsigned int threshold =
s->pixel_black_th_i;
155 unsigned int *counterp = &
s->counter[jobnr];
157 const int linesize =
in->linesize[0];
158 const int w =
in->width;
159 const int h =
in->height;
160 const int start = (
h * jobnr) / nb_jobs;
161 const int end = (
h * (jobnr+1)) / nb_jobs;
162 const int size = end - start;
163 unsigned int counter = 0;
166 const uint8_t *p =
in->data[0] + start * linesize;
168 for (
int i = 0;
i <
size;
i++) {
169 for (
int x = 0; x <
w; x++)
170 counter += p[x] <= threshold;
174 const uint16_t *p = (
const uint16_t *)(
in->data[0] + start * linesize);
176 for (
int i = 0;
i <
size;
i++) {
177 for (
int x = 0; x <
w; x++)
178 counter += p[x] <= threshold;
192 double picture_black_ratio = 0;
197 for (
int i = 0;
i <
s->nb_threads;
i++)
198 s->nb_black_pixels +=
s->counter[
i];
200 picture_black_ratio = (
double)
s->nb_black_pixels / (
inlink->w *
inlink->h);
203 "frame:%"PRId64
" picture_black_ratio:%f pts:%s t:%s type:%c\n",
204 inlink->frame_count_out, picture_black_ratio,
208 if (picture_black_ratio >=
s->picture_black_ratio_th) {
209 if (!
s->black_started) {
211 s->black_started = 1;
212 s->black_start = picref->
pts;
216 }
else if (
s->black_started) {
218 s->black_started = 0;
219 s->black_end = picref->
pts;
225 s->last_picref_pts = picref->
pts;
226 s->nb_black_pixels = 0;
236 if (
s->black_started) {
238 s->black_end =
s->last_picref_pts;
262 .
name =
"blackdetect",
269 .priv_class = &blackdetect_class,
#define AV_PIX_FMT_YUVA422P16
AVPixelFormat
Pixel format.
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
static const AVOption blackdetect_options[]
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
const AVPixFmtDescriptor * av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
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
int64_t black_end
pts end time of the last black picture
double black_min_duration_time
minimum duration of detected black, in seconds
#define AV_PIX_FMT_YUVA422P9
int64_t last_picref_pts
pts of the last input picture
This structure describes decoded (raw) audio or video data.
int64_t pts
Presentation timestamp in time_base units (time when frame should be shown to user).
#define AV_PIX_FMT_YUVA420P16
#define AV_PIX_FMT_YUVA420P10
#define AV_PIX_FMT_YUV420P10
static int black_counter(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
#define AV_LOG_VERBOSE
Detailed information.
@ AV_PIX_FMT_YUV440P
planar YUV 4:4:0 (1 Cr & Cb sample per 1x2 Y samples)
const char * name
Filter name.
AVFormatInternal * internal
An opaque field for libavformat internal usage.
A link between two filters.
#define AV_PIX_FMT_YUVA422P10
#define AV_PIX_FMT_YUVA420P9
#define AV_PIX_FMT_YUVA444P16
#define AV_PIX_FMT_YUV422P9
#define AV_PIX_FMT_GRAY16
A filter pad used for either input or output.
#define AV_PIX_FMT_YUV444P10
#define AV_PIX_FMT_YUV422P16
static const AVFilterPad blackdetect_inputs[]
@ AV_PIX_FMT_YUVA420P
planar YUV 4:2:0, 20bpp, (1 Cr & Cb sample per 2x2 Y & A samples)
#define AV_PIX_FMT_YUV444P16
static av_cold void uninit(AVFilterContext *ctx)
static double av_q2d(AVRational a)
Convert an AVRational to a double.
static int config_input(AVFilterLink *inlink)
static const AVFilterPad outputs[]
static enum AVPixelFormat pix_fmts[]
#define AV_PIX_FMT_YUVA444P12
#define AV_PIX_FMT_YUV420P9
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
#define AV_PIX_FMT_YUV420P16
#define AV_PIX_FMT_GRAY14
@ AV_PIX_FMT_YUV420P
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
#define AV_PIX_FMT_GRAY10
Describe the class of an AVClass context structure.
Rational number (pair of numerator and denominator).
#define AV_PIX_FMT_YUV440P10
#define AV_PIX_FMT_YUV422P10
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
@ AV_PIX_FMT_GRAY8
Y , 8bpp.
static enum AVPixelFormat yuvj_formats[]
enum AVPictureType pict_type
Picture type of the frame.
#define av_ts2timestr(ts, tb)
Convenience macro, the return value should be used only directly in function arguments but never stan...
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
#define AV_PIX_FMT_YUV422P12
#define AV_PIX_FMT_YUV444P12
int64_t black_start
pts start time of the first black picture
@ AV_PIX_FMT_YUVA444P
planar YUV 4:4:4 32bpp, (1 Cr & Cb sample per 1x1 Y & A samples)
#define AV_PIX_FMT_YUVA444P10
#define AV_LOG_INFO
Standard information.
char av_get_picture_type_char(enum AVPictureType pict_type)
Return a single letter to describe the given picture type pict_type.
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
int ff_filter_get_nb_threads(AVFilterContext *ctx)
Get number of threads for current filter instance.
static void check_black_end(AVFilterContext *ctx)
@ AV_PIX_FMT_NV21
as above, but U and V bytes are swapped
const char * name
Pad name.
#define AV_PIX_FMT_YUV444P9
double picture_black_ratio_th
int64_t black_min_duration
minimum duration of detected black, expressed in timebase units
@ AV_PIX_FMT_NV12
planar YUV 4:2:0, 12bpp, 1 plane for Y and 1 plane for the UV components, which are interleaved (firs...
#define AV_PIX_FMT_YUVA444P9
unsigned int pixel_black_th_i
static const AVFilterPad blackdetect_outputs[]
#define AV_PIX_FMT_YUV420P12
#define AV_PIX_FMT_YUV422P14
void * av_calloc(size_t nmemb, size_t size)
Non-inlined equivalent of av_mallocz_array().
unsigned int nb_black_pixels
number of black pixels counted so far
#define AV_PIX_FMT_YUVA422P12
AVDictionary * metadata
metadata.
@ AV_PIX_FMT_YUV444P
planar YUV 4:4:4, 24bpp, (1 Cr & Cb sample per 1x1 Y samples)
static const int factor[16]
static int filter_frame(AVFilterLink *inlink, AVFrame *picref)
#define AVFILTER_FLAG_SLICE_THREADS
The filter supports multithreading by splitting frames into multiple parts and processing them concur...
AVFilter ff_vf_blackdetect
@ AV_PIX_FMT_YUV422P
planar YUV 4:2:2, 16bpp, (1 Cr & Cb sample per 2x1 Y samples)
Descriptor that unambiguously describes how the bits of a pixel are stored in the up to 4 data planes...
AVFILTER_DEFINE_CLASS(blackdetect)
int av_dict_set(AVDictionary **pm, const char *key, const char *value, int flags)
Set the given entry in *pm, overwriting an existing entry.
@ AV_PIX_FMT_YUV411P
planar YUV 4:1:1, 12bpp, (1 Cr & Cb sample per 4x1 Y samples)
#define flags(name, subs,...)
@ AV_PIX_FMT_YUV410P
planar YUV 4:1:0, 9bpp, (1 Cr & Cb sample per 4x4 Y samples)
#define av_ts2str(ts)
Convenience macro, the return value should be used only directly in function arguments but never stan...
#define AV_PIX_FMT_YUV440P12
#define AV_PIX_FMT_YUV444P14
#define AV_PIX_FMT_GRAY12
@ AV_PIX_FMT_YUVA422P
planar YUV 4:2:2 24bpp, (1 Cr & Cb sample per 2x1 Y & A samples)
#define AV_PIX_FMT_YUV420P14
static int query_formats(AVFilterContext *ctx)