59 #define OFFSET(x) offsetof(AudioFIRSourceContext, x) 60 #define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM 176 (*items)[(*nb_items)++] =
av_strtod(tail, &tail);
177 new_items =
av_fast_realloc(*items, items_size, (*nb_items + 1) *
sizeof(
float));
183 }
while (tail && *tail);
194 for (
int i = 0;
i < minterp;
i++) {
195 for (
int j = 1; j < m; j++) {
196 const float x =
i / (float)minterp;
199 const float mg = (x - freq[j-1]) / (freq[j] - freq[j-1]) * (magnitude[j] - magnitude[j-1]) + magnitude[j-1];
200 const float ph = (x - freq[j-1]) / (freq[j] - freq[j-1]) * (phase[j] - phase[j-1]) + phase[j-1];
202 complexf[
i].
re = mg *
cosf(ph);
203 complexf[
i].
im = mg *
sinf(ph);
214 float overlap, scale = 1.f, compensation;
215 int fft_size, middle,
ret;
232 av_log(ctx,
AV_LOG_ERROR,
"Number of frequencies, magnitudes and phases must be same and >= 2.\n");
237 if (
i == 0 && s->
freq[
i] != 0.f) {
276 compensation = 2.f / fft_size;
279 for (
int i = 0;
i <= middle;
i++) {
303 memcpy(frame->
data[0], s->
taps + s->
pts, nb_samples *
sizeof(
float));
329 .priv_class = &afirsrc_class,
av_cold void av_tx_uninit(AVTXContext **ctx)
Frees a context and sets ctx to NULL, does nothing when ctx == NULL.
static av_cold int config_output(AVFilterLink *outlink)
This structure describes decoded (raw) audio or video data.
static void lininterp(AVComplexFloat *complexf, const float *freq, const float *magnitude, const float *phase, int m, int minterp)
#define AV_LOG_WARNING
Something somehow does not look correct.
Main libavfilter public API header.
static void generate_window_func(float *lut, int N, int win_func, float *overlap)
void * av_calloc(size_t nmemb, size_t size)
Non-inlined equivalent of av_mallocz_array().
static av_cold void uninit(AVFilterContext *ctx)
const char * name
Pad name.
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
int64_t pts
Presentation timestamp in time_base units (time when frame should be shown to user).
#define AVERROR_EOF
End of file.
A filter pad used for either input or output.
static int request_frame(AVFilterLink *outlink)
A link between two filters.
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
void(* av_tx_fn)(AVTXContext *s, void *out, void *in, ptrdiff_t stride)
Function pointer to a function to perform the transform.
AVFrame * ff_get_audio_buffer(AVFilterLink *link, int nb_samples)
Request an audio samples buffer with a specific set of permissions.
#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
Standard complex to complex FFT with sample data type AVComplexFloat.
static int parse_string(char *str, float **items, int *nb_items, int *items_size)
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
void * av_fast_realloc(void *ptr, unsigned int *size, size_t min_size)
Reallocate the given buffer if it is not large enough, otherwise do nothing.
AVFilterContext * src
source filter
static const AVFilterPad outputs[]
A list of supported channel layouts.
double av_strtod(const char *numstr, char **tail)
Parse the string in numstr and return its value as a double.
AVSampleFormat
Audio sample formats.
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
Describe the class of an AVClass context structure.
const char * name
Filter name.
av_cold int av_tx_init(AVTXContext **ctx, av_tx_fn *tx, enum AVTXType type, int inv, int len, const void *scale, uint64_t flags)
Initialize a transform context with the given configuration (i)MDCTs with an odd length are currently...
enum MovChannelLayoutTag * layouts
AVFILTER_DEFINE_CLASS(afirsrc)
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
static const AVOption afirsrc_options[]
static const AVFilterPad afirsrc_outputs[]
static av_cold int query_formats(AVFilterContext *ctx)
static enum AVSampleFormat sample_fmts[]
AVComplexFloat * complexf
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
#define AV_CH_LAYOUT_MONO
static av_cold int init(AVFilterContext *ctx)
simple arithmetic expression evaluator