Go to the documentation of this file.
80 #define OFFSET(x) offsetof(LUT2Context, x)
81 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
100 for (
i = 0;
i < 4;
i++) {
109 AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV440P, \
110 AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P, \
111 AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUV420P, \
112 AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P, \
113 AV_PIX_FMT_YUVJ411P, AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P, \
114 AV_PIX_FMT_GRAY8, AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRAP,
117 AV_PIX_FMT_GBRP9, AV_PIX_FMT_GRAY9, \
118 AV_PIX_FMT_YUV420P9, AV_PIX_FMT_YUV422P9, AV_PIX_FMT_YUV444P9, \
119 AV_PIX_FMT_YUVA420P9, AV_PIX_FMT_YUVA422P9, AV_PIX_FMT_YUVA444P9,
122 AV_PIX_FMT_GRAY10, AV_PIX_FMT_GBRP10, AV_PIX_FMT_GBRAP10, \
123 AV_PIX_FMT_YUV420P10, AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUV444P10, \
124 AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA444P10,
127 AV_PIX_FMT_YUV420P12, AV_PIX_FMT_YUV422P12, AV_PIX_FMT_YUV444P12, AV_PIX_FMT_YUV440P12, \
128 AV_PIX_FMT_YUVA422P12, AV_PIX_FMT_YUVA444P12, \
129 AV_PIX_FMT_GRAY12, AV_PIX_FMT_GBRAP12, AV_PIX_FMT_GBRP12,
132 AV_PIX_FMT_YUV420P14, AV_PIX_FMT_YUV422P14, AV_PIX_FMT_YUV444P14, \
133 AV_PIX_FMT_GRAY14, AV_PIX_FMT_GBRP14,
136 AV_PIX_FMT_YUV420P16, AV_PIX_FMT_YUV422P16, AV_PIX_FMT_YUV444P16, \
137 AV_PIX_FMT_YUVA420P16, AV_PIX_FMT_YUVA422P16, AV_PIX_FMT_YUVA444P16, \
138 AV_PIX_FMT_GBRP16, AV_PIX_FMT_GBRAP16, AV_PIX_FMT_GRAY16,
177 if (
s->tlut2 || !
s->odepth)
185 case 8:
pix_fmts = bit8_pix_fmts;
break;
186 case 9:
pix_fmts = bit9_pix_fmts;
break;
187 case 10:
pix_fmts = bit10_pix_fmts;
break;
188 case 12:
pix_fmts = bit12_pix_fmts;
break;
189 case 14:
pix_fmts = bit14_pix_fmts;
break;
190 case 16:
pix_fmts = bit16_pix_fmts;
break;
204 int vsub =
desc->log2_chroma_h;
208 s->heightx[0] =
s->heightx[3] =
inlink->h;
210 s->widthx[0] =
s->widthx[3] =
inlink->w;
214 s->depthx =
desc->comp[0].depth;
218 s->depthy =
desc->comp[0].depth;
231 int vsub =
desc->log2_chroma_h;
234 s->depthy =
desc->comp[0].depth;
237 s->heighty[0] =
s->heighty[3] =
inlink->h;
239 s->widthy[0] =
s->widthy[3] =
inlink->w;
244 #define DEFINE_LUT2(zname, xname, yname, ztype, xtype, ytype, zdiv, xdiv, ydiv) \
245 static int lut2_##zname##_##xname##_##yname(AVFilterContext *ctx, \
247 int jobnr, int nb_jobs) \
249 LUT2Context *s = ctx->priv; \
250 ThreadData *td = arg; \
251 AVFrame *out = td->out; \
252 AVFrame *srcx = td->srcx; \
253 AVFrame *srcy = td->srcy; \
254 const int odepth = s->odepth; \
257 for (p = 0; p < s->nb_planes; p++) { \
258 const int slice_start = (s->heightx[p] * jobnr) / nb_jobs; \
259 const int slice_end = (s->heightx[p] * (jobnr+1)) / nb_jobs; \
260 const uint16_t *lut = s->lut[p]; \
261 const xtype *srcxx; \
262 const ytype *srcyy; \
265 dst = (ztype *)(out->data[p] + slice_start * out->linesize[p]); \
266 srcxx = (const xtype *)(srcx->data[p] + slice_start * srcx->linesize[p]);\
267 srcyy = (const ytype *)(srcy->data[p] + slice_start * srcy->linesize[p]);\
269 for (y = slice_start; y < slice_end; y++) { \
270 for (x = 0; x < s->widthx[p]; x++) { \
271 dst[x] = av_clip_uintp2_c(lut[(srcyy[x] << s->depthx) | srcxx[x]], odepth); \
274 dst += out->linesize[p] / zdiv; \
275 srcxx += srcx->linesize[p] / xdiv; \
276 srcyy += srcy->linesize[p] / ydiv; \
289 DEFINE_LUT2(16, 16, 16, uint16_t, uint16_t, uint16_t, 2, 2, 2)
303 if (
ctx->is_disabled || !srcy) {
332 s->depth =
s->depthx +
s->depthy;
333 s->nb_planes =
s->nb_planesx;
335 s->lut2 =
s->depth > 16 ? lut2_16_16_16 : lut2_8_8_8;
337 if (
s->depthx == 8 &&
s->depthy == 8 &&
s->odepth > 8)
338 s->lut2 = lut2_16_8_8;
339 if (
s->depthx > 8 &&
s->depthy == 8 &&
s->odepth > 8)
340 s->lut2 = lut2_16_16_8;
341 if (
s->depthx == 8 &&
s->depthy > 8 &&
s->odepth > 8)
342 s->lut2 = lut2_16_8_16;
343 if (
s->depthx == 8 &&
s->depthy == 8 &&
s->odepth == 8)
344 s->lut2 = lut2_8_8_8;
345 if (
s->depthx > 8 &&
s->depthy == 8 &&
s->odepth == 8)
346 s->lut2 = lut2_8_16_8;
347 if (
s->depthx == 8 &&
s->depthy > 8 &&
s->odepth == 8)
348 s->lut2 = lut2_8_8_16;
349 if (
s->depthx > 8 &&
s->depthy > 8 &&
s->odepth == 8)
350 s->lut2 = lut2_8_16_16;
352 s->odepth =
s->depthx;
355 for (p = 0; p <
s->nb_planes; p++) {
361 for (p = 0; p <
s->nb_planes; p++) {
367 s->comp_expr[p] =
NULL;
372 "Error when parsing the expression '%s' for the component %d.\n",
373 s->comp_expr_str[p], p);
378 for (y = 0; y < (1 <<
s->depthy); y++) {
380 for (
x = 0;
x < (1 <<
s->depthx);
x++) {
385 "Error when evaluating the expression '%s' for the values %d and %d for the component %d.\n",
386 s->comp_expr_str[p],
x, y, p);
390 s->lut[p][(y <<
s->depthx) +
x] = res;
407 int vsub =
desc->log2_chroma_h;
410 outlink->
w = srcx->
w;
411 outlink->
h = srcx->
h;
418 s->height[0] =
s->height[3] = outlink->
h;
420 s->width[0] =
s->width[3] = outlink->
w;
427 if (srcx->
w != srcy->
w || srcx->
h != srcy->
h) {
429 "(size %dx%d) do not match the corresponding "
430 "second input link %s parameters (size %dx%d)\n",
431 ctx->input_pads[0].name, srcx->
w, srcx->
h,
432 ctx->input_pads[1].name,
437 if (
s->nb_planesx !=
s->nb_planesy) {
439 "(%d) do not match the corresponding "
440 "second input link %s number of planes (%d)\n",
441 ctx->input_pads[0].name,
s->nb_planesx,
442 ctx->input_pads[1].name,
s->nb_planesy);
446 if (
s->nb_planesx !=
s->nb_planes) {
448 "(%d) do not match the corresponding "
449 "output link %s number of planes (%d)\n",
450 ctx->input_pads[0].name,
s->nb_planesx,
451 ctx->output_pads[0].name,
s->nb_planes);
455 if (
s->widthx[1] !=
s->widthy[1] ||
s->heightx[1] !=
s->heighty[1]) {
457 "(size %dx%d) do not match the corresponding "
458 "second input link %s 2nd plane (size %dx%d)\n",
459 ctx->input_pads[0].name,
s->widthx[1],
s->heightx[1],
460 ctx->input_pads[1].name,
461 s->widthy[1],
s->heighty[1]);
465 if (
s->widthx[2] !=
s->widthy[2] ||
s->heightx[2] !=
s->heighty[2]) {
467 "(size %dx%d) do not match the corresponding "
468 "second input link %s 3rd plane (size %dx%d)\n",
469 ctx->input_pads[0].name,
s->widthx[2],
s->heightx[2],
470 ctx->input_pads[1].name,
471 s->widthy[2],
s->heighty[2]);
475 if (
s->widthx[1] !=
s->width[1] ||
s->heightx[1] !=
s->height[1]) {
477 "(size %dx%d) do not match the corresponding "
478 "output link %s 2nd plane (size %dx%d)\n",
479 ctx->input_pads[0].name,
s->widthx[1],
s->heightx[1],
480 ctx->output_pads[0].name,
s->width[1],
s->height[1]);
484 if (
s->widthx[2] !=
s->width[2] ||
s->heightx[2] !=
s->height[2]) {
486 "(size %dx%d) do not match the corresponding "
487 "output link %s 3rd plane (size %dx%d)\n",
488 ctx->input_pads[0].name,
s->widthx[2],
s->heightx[2],
489 ctx->output_pads[0].name,
s->width[2],
s->height[2]);
546 #define lut2_options options
553 .preinit = lut2_framesync_preinit,
555 .priv_class = &lut2_class,
565 #if CONFIG_TLUT2_FILTER
571 s->tlut2 = !strcmp(
ctx->filter->name,
"tlut2");
585 if (
ctx->is_disabled) {
601 td.srcy =
s->prev_frame;
612 static const AVOption tlut2_options[] = {
626 .filter_frame = tlut2_filter_frame,
643 .description =
NULL_IF_CONFIG_SMALL(
"Compute and apply a lookup table from two successive frames."),
645 .priv_class = &tlut2_class,
AVFrame * ff_get_video_buffer(AVFilterLink *link, int w, int h)
Request a picture buffer with a specific set of permissions.
int ff_framesync_configure(FFFrameSync *fs)
Configure a frame sync structure.
AVPixelFormat
Pixel format.
static int config_output(AVFilterLink *outlink)
static av_cold int init(AVCodecContext *avctx)
int(* lut2)(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
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
void ff_framesync_uninit(FFFrameSync *fs)
Free all memory currently allocated.
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)
int ff_framesync_get_frame(FFFrameSync *fs, unsigned in, AVFrame **rframe, unsigned get)
Get the current frame in an input.
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
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
This structure describes decoded (raw) audio or video data.
#define DEFINE_LUT2(zname, xname, yname, ztype, xtype, ytype, zdiv, xdiv, ydiv)
const char * name
Filter name.
@ EXT_INFINITY
Extend the frame to infinity.
static int config_inputx(AVFilterLink *inlink)
AVFormatInternal * internal
An opaque field for libavformat internal usage.
A link between two filters.
int av_expr_parse(AVExpr **expr, const char *s, const char *const *const_names, const char *const *func1_names, double(*const *funcs1)(void *, double), const char *const *func2_names, double(*const *funcs2)(void *, double, double), int log_offset, void *log_ctx)
Parse an expression.
int av_pix_fmt_count_planes(enum AVPixelFormat pix_fmt)
@ EXT_STOP
Completely stop all streams with this one.
FFmpeg Automated Testing Environment ************************************Introduction Using FATE from your FFmpeg source directory Submitting the results to the FFmpeg result aggregation server Uploading new samples to the fate suite FATE makefile targets and variables Makefile targets Makefile variables Examples Introduction **************FATE is an extended regression suite on the client side and a means for results aggregation and presentation on the server side The first part of this document explains how you can use FATE from your FFmpeg source directory to test your ffmpeg binary The second part describes how you can run FATE to submit the results to FFmpeg’s FATE server In any way you can have a look at the publicly viewable FATE results by visiting this as it can be seen if some test on some platform broke with their recent contribution This usually happens on the platforms the developers could not test on The second part of this document describes how you can run FATE to submit your results to FFmpeg’s FATE server If you want to submit your results be sure to check that your combination of OS and compiler is not already listed on the above mentioned website In the third part you can find a comprehensive listing of FATE makefile targets and variables Using FATE from your FFmpeg source directory **********************************************If you want to run FATE on your machine you need to have the samples in place You can get the samples via the build target fate rsync Use this command from the top level source this will cause FATE to fail NOTE To use a custom wrapper to run the pass ‘ target exec’ to ‘configure’ or set the TARGET_EXEC Make variable Submitting the results to the FFmpeg result aggregation server ****************************************************************To submit your results to the server you should run fate through the shell script ‘tests fate sh’ from the FFmpeg sources This script needs to be invoked with a configuration file as its first argument tests fate sh path to fate_config A configuration file template with comments describing the individual configuration variables can be found at ‘doc fate_config sh template’ Create a configuration that suits your based on the configuration template The ‘slot’ configuration variable can be any string that is not yet but it is suggested that you name it adhering to the following pattern ‘ARCH OS COMPILER COMPILER VERSION’ The configuration file itself will be sourced in a shell therefore all shell features may be used This enables you to setup the environment as you need it for your build For your first test runs the ‘fate_recv’ variable should be empty or commented out This will run everything as normal except that it will omit the submission of the results to the server The following files should be present in $workdir as specified in the configuration it may help to try out the ‘ssh’ command with one or more ‘ v’ options You should get detailed output concerning your SSH configuration and the authentication process The only thing left is to automate the execution of the fate sh script and the synchronisation of the samples directory Uploading new samples to the fate suite *****************************************If you need a sample uploaded send a mail to samples request This is for developers who have an account on the fate suite server If you upload new please make sure they are as small as space on each network bandwidth and so on benefit from smaller test cases Also keep in mind older checkouts use existing sample that means in practice generally do not remove or overwrite files as it likely would break older checkouts or releases Also all needed samples for a commit should be ideally before the push If you need an account for frequently uploading samples or you wish to help others by doing that send a mail to ffmpeg devel rsync vauL Duo x
static int process_frame(FFFrameSync *fs)
void av_expr_free(AVExpr *e)
Free a parsed expression previously created with av_expr_parse().
A filter pad used for either input or output.
double var_values[VAR_VARS_NB]
static const char *const var_names[]
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
static int activate(AVFilterContext *ctx)
#define AV_CEIL_RSHIFT(a, b)
AVRational sample_aspect_ratio
agreed upon sample aspect ratio
static av_cold void uninit(AVFilterContext *ctx)
AVRational frame_rate
Frame rate of the stream on the link, or 1/0 if unknown or variable; if left to 0/0,...
static enum AVPixelFormat pix_fmts[]
double av_expr_eval(AVExpr *e, const double *const_values, void *opaque)
Evaluate a previously parsed expression.
AVFrame * av_frame_clone(const AVFrame *src)
Create a new frame that references the same data as src.
int64_t av_rescale_q(int64_t a, AVRational bq, AVRational cq)
Rescale a 64-bit integer by 2 rational numbers.
Describe the class of an AVClass context structure.
int av_frame_copy_props(AVFrame *dst, const AVFrame *src)
Copy only "metadata" fields from src to dst.
#define fs(width, name, subs,...)
static int lut2_config_output(AVFilterLink *outlink)
uint16_t * lut[4]
lookup table for each component
static const AVFilterPad inputs[]
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
int format
agreed upon media format
AVFilterContext * src
source filter
static enum AVPixelFormat all_pix_fmts[]
static const AVOption options[]
#define AVFILTER_DEFINE_CLASS(fname)
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
#define i(width, name, range_min, range_max)
int w
agreed upon image width
#define av_malloc_array(a, b)
int ff_filter_get_nb_threads(AVFilterContext *ctx)
Get number of threads for current filter instance.
Used for passing data between threads.
static int config_inputy(AVFilterLink *inlink)
const char * name
Pad name.
static const AVFilterPad outputs[]
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 it should directly call filter_frame on the corresponding output For a if there are queued frames already one of these frames should be pushed If the filter should request a frame on one of its repeatedly until at least one frame has been pushed Return or at least make progress towards producing a frame
int ff_framesync_init(FFFrameSync *fs, AVFilterContext *parent, unsigned nb_in)
Initialize a frame sync structure.
int h
agreed upon image height
AVRational time_base
Define the time base used by the PTS of the frames/samples which will pass through this link.
#define AVFILTER_FLAG_SLICE_THREADS
The filter supports multithreading by splitting frames into multiple parts and processing them concur...
Descriptor that unambiguously describes how the bits of a pixel are stored in the up to 4 data planes...
#define AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL
Same as AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC, except that the filter will have its filter_frame() c...
#define flags(name, subs,...)
int ff_framesync_activate(FFFrameSync *fs)
Examine the frames in the filter's input and try to produce output.
static int query_formats(AVFilterContext *ctx)
FRAMESYNC_DEFINE_CLASS(lut2, LUT2Context, fs)