61 #define OFFSET(x) offsetof(AudioHistogramContext, x) 62 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM 176 for (n = H; n < s->
h; n++) {
185 for (y = 0; y <
w; y++) {
192 for (n = 0; n <
H; n++) {
204 for (c = 0; c < inlink->
channels; c++) {
227 for (c = 0; c < inlink->
channels; c++) {
270 uf *= 0.5 * sin((2 * M_PI * c) / s->
dchannels);
271 vf *= 0.5 * cos((2 * M_PI * c) / s->
dchannels);
274 for (n = 0; n <
w; n++) {
278 a = achistogram[n] - shistogram[n];
282 aa = a / (double)acmax;
285 aa = sqrt(a) / sqrt(acmax);
294 aa = 1. -
log2(a + 1) /
log2(acmax + 1);
306 for (y = H - h; y <
H; y++) {
324 for (y = H - h; y <
H; y++) {
343 for (n = 0; n <
w; n++) {
354 for (p = 0; p < 4; p++) {
355 for (y = s->
h; y >= H + 1; y--) {
405 for (i = 0; i < 101; i++)
428 .
name =
"ahistogram",
434 .
inputs = ahistogram_inputs,
436 .priv_class = &ahistogram_class,
static const AVFilterPad ahistogram_inputs[]
This structure describes decoded (raw) audio or video data.
Main libavfilter public API header.
int h
agreed upon image height
FF_FILTER_FORWARD_STATUS(inlink, outlink)
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
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
AVFrame * ff_get_video_buffer(AVFilterLink *link, int w, int h)
Request a picture buffer with a specific set of permissions.
AVFilterFormatsConfig outcfg
Lists of supported formats / etc.
void * av_calloc(size_t nmemb, size_t size)
Non-inlined equivalent of av_mallocz_array().
const char * name
Pad name.
AVFilterLink ** inputs
array of pointers to input links
#define av_assert0(cond)
assert() equivalent, that is always enabled.
static double cb(void *priv, double x, double y)
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
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
static int query_formats(AVFilterContext *ctx)
int64_t pts
Presentation timestamp in time_base units (time when frame should be shown to user).
static const AVOption ahistogram_options[]
static int config_output(AVFilterLink *outlink)
static __device__ float fabsf(float a)
#define FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink)
Forward the status on an output link to an input link.
A filter pad used for either input or output.
A link between two filters.
AVRational frame_rate
Frame rate of the stream on the link, or 1/0 if unknown or variable; if left to 0/0, will be automatically copied from the first input of the source filter if it exists.
int sample_rate
samples per second
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
simple assert() macros that are a bit more flexible than ISO C assert().
static int config_input(AVFilterLink *inlink)
int w
agreed upon image width
AVFILTER_DEFINE_CLASS(ahistogram)
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
int64_t av_rescale(int64_t a, int64_t b, int64_t c)
Rescale a 64-bit integer with rounding to nearest.
static int activate(AVFilterContext *ctx)
AVFilterContext * src
source filter
AVFrame * av_frame_clone(const AVFrame *src)
Create a new frame that references the same data as src.
static const AVFilterPad outputs[]
A list of supported channel layouts.
static const AVFilterPad ahistogram_outputs[]
AVSampleFormat
Audio sample formats.
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
planar YUV 4:4:4 32bpp, (1 Cr & Cb sample per 1x1 Y & A samples)
int ff_inlink_consume_samples(AVFilterLink *link, unsigned min, unsigned max, AVFrame **rframe)
Take samples from the link's FIFO and update the link's stats.
Describe the class of an AVClass context structure.
Rational number (pair of numerator and denominator).
offset must point to AVRational
const char * name
Filter name.
AVRational sample_aspect_ratio
agreed upon sample aspect ratio
offset must point to two consecutive integers
AVFilterLink ** outputs
array of pointers to output links
enum MovChannelLayoutTag * layouts
static enum AVPixelFormat pix_fmts[]
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
static av_cold void uninit(AVFilterContext *ctx)
int channels
Number of channels.
AVFilterFormatsConfig incfg
Lists of supported formats / etc.
FF_FILTER_FORWARD_WANTED(outlink, inlink)
AVFilterContext * dst
dest filter
AVFilter ff_avf_ahistogram
static enum AVSampleFormat sample_fmts[]
#define av_malloc_array(a, b)
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
uint8_t ** extended_data
pointers to the data planes/channels.
AVPixelFormat
Pixel format.
int nb_samples
number of audio samples (per channel) described by this frame