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40 #define CLOCK_BITSIZE_MIN 0.2f
41 #define CLOCK_BITSIZE_MAX 1.5f
42 #define SYNC_BITSIZE_MIN 12.f
43 #define SYNC_BITSIZE_MAX 15.f
89 #define OFFSET(x) offsetof(ReadEIA608Context, x)
90 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
143 if (
s->nb_allocated < end - start + 1) {
144 const int diff = end - start + 1 -
s->nb_allocated;
149 memset(&
s->scan[
s->nb_allocated], 0,
diff *
sizeof(*
s->scan));
150 s->nb_allocated = end - start + 1;
153 for (
int i = 0;
i <
s->nb_allocated;
i++) {
182 const int max =
s->max;
183 int start = 0, end = 0, middle;
184 int black = 0, white = 0;
187 for (
int i = 0;
i <=
max;
i++) {
194 for (
int i =
max;
i >= 0;
i--) {
201 middle = start + (end - start) / 2;
204 for (
int i = start;
i <= middle;
i++) {
212 for (
int i = end;
i >= middle;
i--) {
225 float sum = 0.0,
mean = 0.0;
227 for (
int i = 0;
i <
len;
i++)
228 sum +=
line[
i].filtered;
238 float standard_deviation = 0.f;
240 for (
int i = 0;
i <
len;
i++)
241 standard_deviation += (
line[
i].filtered - m) * (
line[
i].filtered - m);
243 return sqrtf(standard_deviation / (
len - 1));
247 int lag,
float threshold,
float influence,
int len)
249 for (
int i = lag;
i <
len + lag;
i++) {
254 for (
int i = 0;
i < lag;
i++) {
262 for (
int i = lag;
i <
len + lag;
i++) {
265 line[
i].output = 255;
270 line[
i].filtered = influence *
line[
i].unfiltered + (1.f - influence) *
line[
i-1].filtered;
272 int distance_from_black, distance_from_white;
277 line[
i].output = distance_from_black <= distance_from_white ? 0 : 255;
287 int hold =
line[
LAG].output, cnt = 0;
294 code[cnt].size =
i - last;
295 code[cnt].bit = hold;
296 hold =
line[
i].output;
303 code[cnt].bit = hold;
311 for (
int i = 0;
i <
len;
i++) {
317 #define READ_LINE(type, name) \
318 static void read_##name(AVFrame *in, int nb_line, LineItem *line, int lp, int w) \
320 const type *src = (const type *)(&in->data[0][nb_line * in->linesize[0]]);\
323 for (int i = 0; i < w; i++) { \
324 int a = FFMAX(i - 3, 0); \
325 int b = FFMAX(i - 2, 0); \
326 int c = FFMAX(i - 1, 0); \
327 int d = FFMIN(i + 3, w-1); \
328 int e = FFMIN(i + 2, w-1); \
329 int f = FFMIN(i + 1, w-1); \
331 line[LAG + i].input = (src[a] + src[b] + src[c] + src[i] + \
332 src[d] + src[e] + src[f] + 6) / 7; \
335 for (int i = 0; i < w; i++) { \
336 line[LAG + i].input = src[i]; \
352 s->depth =
desc->comp[0].depth;
353 s->max = (1 <<
desc->comp[0].depth) - 1;
354 s->read_line[0] = read_byte;
355 s->read_line[1] = read_word;
365 uint8_t codes[19] = { 0 };
366 float bit_size = 0.f;
373 s->read_line[
s->depth > 8](in, nb_line,
line,
s->lp,
w);
390 for (
i = 14;
i <
len;
i++) {
395 for (
i = 1;
i < 14;
i++) {
402 if (scan->
code[15].
size / bit_size < 0.45f) {
406 for (j = 0,
i = 14;
i <
len;
i++) {
412 for (
int k = 0; j < 19 && k <
run; k++) {
420 for (ch = 0; ch < 2; ch++) {
422 int b = codes[3 + ch * 8 +
i];
435 scan->
byte[ch] = 0x7F;
445 int job,
int nb_jobs)
449 const int h =
s->end -
s->start + 1;
450 const int start = (
h * job) / nb_jobs;
451 const int end = (
h * (job+1)) / nb_jobs;
454 for (
int i = start;
i < end;
i++) {
474 for (
int i = 0;
i <
s->end -
s->start + 1;
i++) {
502 for (
int i = 0;
i <
s->nb_allocated;
i++) {
515 char *res,
int res_len,
int flags)
518 int ret, start =
s->start, end =
s->end;
550 .
name =
"readeia608",
551 .description =
NULL_IF_CONFIG_SMALL(
"Read EIA-608 Closed Caption codes from input video and write them to frame metadata."),
553 .priv_class = &readeia608_class,
#define AV_PIX_FMT_YUVA422P16
#define AV_LOG_WARNING
Something somehow does not look correct.
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 int process_command(AVFilterContext *ctx, const char *cmd, const char *args, char *res, int res_len, int flags)
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)
#define FILTER_PIXFMTS_ARRAY(array)
filter_frame For filters that do not use the this method is called when a frame is pushed to the filter s input It can be called at any time except in a reentrant way If the input frame is enough to produce output
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
#define AV_PIX_FMT_YUVA422P9
static const AVOption readeia608_options[]
This structure describes decoded (raw) audio or video data.
#define AV_PIX_FMT_YUVA420P16
#define AV_PIX_FMT_YUVA420P10
const AVFilter ff_vf_readeia608
#define AV_PIX_FMT_YUV420P10
@ AV_PIX_FMT_YUV440P
planar YUV 4:4:0 (1 Cr & Cb sample per 1x2 Y samples)
const char * name
Filter name.
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
A link between two filters.
#define AV_PIX_FMT_YUVA422P10
#define bit(string, value)
#define AV_PIX_FMT_YUVA420P9
static float meanf(const LineItem *line, int len)
#define AV_PIX_FMT_YUVA444P16
#define AV_PIX_FMT_YUV422P9
#define AV_PIX_FMT_GRAY16
static __device__ float fabsf(float a)
A filter pad used for either input or output.
#define AV_PIX_FMT_YUV444P10
@ AV_PIX_FMT_YUVJ411P
planar YUV 4:1:1, 12bpp, (1 Cr & Cb sample per 4x1 Y samples) full scale (JPEG), deprecated in favor ...
static int extract_lines(AVFilterContext *ctx, void *arg, int job, int nb_jobs)
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
#define AV_PIX_FMT_YUV422P16
@ AV_PIX_FMT_YUVJ422P
planar YUV 4:2:2, 16bpp, full scale (JPEG), deprecated in favor of AV_PIX_FMT_YUV422P and setting col...
@ AV_PIX_FMT_YUVA420P
planar YUV 4:2:0, 20bpp, (1 Cr & Cb sample per 2x2 Y & A samples)
#define AV_PIX_FMT_YUV444P16
#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)
static enum AVPixelFormat pixel_fmts[]
#define FILTER_INPUTS(array)
static int periods(const LineItem *line, CodeItem *code, int len)
@ AV_PIX_FMT_YUVJ444P
planar YUV 4:4:4, 24bpp, full scale (JPEG), deprecated in favor of AV_PIX_FMT_YUV444P and setting col...
void(* read_line[2])(AVFrame *in, int nb_line, LineItem *line, int lp, int w)
#define FFABS(a)
Absolute value, Note, INT_MIN / INT64_MIN result in undefined behavior as they are not representable ...
#define AV_PIX_FMT_GRAY10
AVFILTER_DEFINE_CLASS(readeia608)
#define av_realloc_f(p, o, n)
Describe the class of an AVClass context structure.
@ AV_PIX_FMT_YUVJ420P
planar YUV 4:2:0, 12bpp, full scale (JPEG), deprecated in favor of AV_PIX_FMT_YUV420P and setting col...
#define AV_PIX_FMT_YUV440P10
static void find_black_and_white(ReadEIA608Context *s, ScanItem *scan)
static __device__ float sqrtf(float a)
static const AVFilterPad readeia608_inputs[]
#define AV_PIX_FMT_YUV422P10
@ AV_PIX_FMT_GRAY8
Y , 8bpp.
#define READ_LINE(type, name)
static av_cold void uninit(AVFilterContext *ctx)
static void thresholding(ReadEIA608Context *s, ScanItem *scan, LineItem *line, int lag, float threshold, float influence, int len)
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
static void dump_code(AVFilterContext *ctx, ScanItem *scan, int len, int item)
static float stddevf(const LineItem *line, int len)
#define AV_PIX_FMT_YUV422P12
static const AVFilterPad readeia608_outputs[]
#define AV_PIX_FMT_YUV444P12
int ff_filter_process_command(AVFilterContext *ctx, const char *cmd, const char *arg, char *res, int res_len, int flags)
Generic processing of user supplied commands that are set in the same way as the filter options.
static av_always_inline int diff(const struct color_info *a, const struct color_info *b, const int trans_thresh)
static void build_histogram(ReadEIA608Context *s, ScanItem *scan, const LineItem *line, int len)
@ AV_PIX_FMT_YUVA444P
planar YUV 4:4:4 32bpp, (1 Cr & Cb sample per 1x1 Y & A samples)
#define AV_PIX_FMT_YUVA444P10
and forward the test the status of outputs and forward it to the corresponding return FFERROR_NOT_READY If the filters stores internally one or a few frame for some input
#define AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC
Some filters support a generic "enable" expression option that can be used to enable or disable a fil...
static int config_input(AVFilterLink *inlink)
#define i(width, name, range_min, range_max)
and forward the test the status of outputs and forward it to the corresponding return FFERROR_NOT_READY If the filters stores internally one or a few frame for some it can consider them to be part of the FIFO and delay acknowledging a status change accordingly Example code
static void extract_line(AVFilterContext *ctx, AVFrame *in, ScanItem *scan, int w, int nb_line)
int ff_filter_get_nb_threads(AVFilterContext *ctx)
Get number of threads for current filter instance.
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf default value
@ AV_PIX_FMT_YUVJ440P
planar YUV 4:4:0 full scale (JPEG), deprecated in favor of AV_PIX_FMT_YUV440P and setting color_range
const char * name
Pad name.
void * av_calloc(size_t nmemb, size_t size)
#define AV_PIX_FMT_YUV444P9
#define CLOCK_BITSIZE_MAX
#define AV_PIX_FMT_YUVA444P9
#define AV_PIX_FMT_YUV420P12
#define AV_PIX_FMT_YUV422P14
#define AV_PIX_FMT_YUVA422P12
AVDictionary * metadata
metadata.
#define AVFILTER_FLAG_METADATA_ONLY
The filter is a "metadata" filter - it does not modify the frame data in any way.
static float mean(const float *input, int size)
@ AV_PIX_FMT_YUV444P
planar YUV 4:4:4, 24bpp, (1 Cr & Cb sample per 1x1 Y samples)
int av_dict_set_int(AVDictionary **pm, const char *key, int64_t value, int flags)
Convenience wrapper for av_dict_set() that converts the value to a string and stores it.
#define AVFILTER_FLAG_SLICE_THREADS
The filter supports multithreading by splitting frames into multiple parts and processing them concur...
@ 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...
#define FILTER_OUTPUTS(array)
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,...)
#define AVERROR_BUG
Internal bug, also see AVERROR_BUG2.
@ AV_PIX_FMT_YUV410P
planar YUV 4:1:0, 9bpp, (1 Cr & Cb sample per 4x4 Y samples)
#define AV_PIX_FMT_YUV440P12
#define AV_PIX_FMT_YUV444P14
#define AV_PIX_FMT_GRAY12
static av_always_inline int ff_filter_execute(AVFilterContext *ctx, avfilter_action_func *func, void *arg, int *ret, int nb_jobs)
static int config_filter(AVFilterContext *ctx, int start, int end)
The official guide to swscale for confused that consecutive non overlapping rectangles of slice_bottom special converter These generally are unscaled converters of common like for each output line the vertical scaler pulls lines from a ring buffer When the ring buffer does not contain the wanted line
@ AV_PIX_FMT_YUVA422P
planar YUV 4:2:2 24bpp, (1 Cr & Cb sample per 2x1 Y & A samples)
#define AV_PIX_FMT_YUV420P14
#define CLOCK_BITSIZE_MIN