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42 #define OFFSET(x) offsetof(HilbertContext, x)
43 #define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
50 {
"nb_samples",
"set the number of samples per requested frame",
OFFSET(nb_samples),
AV_OPT_TYPE_INT, {.i64 = 1024}, 1, INT_MAX,
FLAGS },
51 {
"n",
"set the number of samples per requested frame",
OFFSET(nb_samples),
AV_OPT_TYPE_INT, {.i64 = 1024}, 1, INT_MAX,
FLAGS },
63 if (!(
s->nb_taps & 1)) {
113 for (
i = 0;
i <
s->nb_taps;
i++) {
114 int k = -(
s->nb_taps / 2) +
i;
119 s->taps[
i] *= (1.f -
cosf(pk)) / pk;
140 nb_samples =
FFMIN(
s->nb_samples,
s->nb_taps -
s->pts);
141 if (nb_samples <= 0) {
149 memcpy(
frame->data[0],
s->taps +
s->pts, nb_samples *
sizeof(
float));
152 s->pts += nb_samples;
174 .priv_class = &hilbert_class,
AVFrame * ff_get_audio_buffer(AVFilterLink *link, int nb_samples)
Request an audio samples buffer with a specific set of permissions.
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
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
static enum AVSampleFormat sample_fmts[]
#define AVERROR_EOF
End of file.
static const AVFilterPad hilbert_outputs[]
static av_cold void uninit(AVFilterContext *ctx)
static const int sample_rates[]
This structure describes decoded (raw) audio or video data.
#define WIN_FUNC_OPTION(win_func_opt_name, win_func_offset, flag, default_window_func)
const char * name
Filter name.
static av_cold int query_formats(const AVFilterContext *ctx, AVFilterFormatsConfig **cfg_in, AVFilterFormatsConfig **cfg_out)
A link between two filters.
static av_cold int init(AVFilterContext *ctx)
const AVFilter ff_asrc_hilbert
A filter pad used for either input or output.
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
static void ff_outlink_set_status(AVFilterLink *link, int status, int64_t pts)
Set the status field of a link from the source filter.
#define FILTER_OUTPUTS(array)
Describe the class of an AVClass context structure.
static void generate_window_func(float *lut, int N, int win_func, float *overlap)
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
static const AVOption hilbert_options[]
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
An AVChannelLayout holds information about the channel layout of audio data.
static int activate(AVFilterContext *ctx)
AVFilterContext * src
source filter
#define i(width, name, range_min, range_max)
#define av_malloc_array(a, b)
AVSampleFormat
Audio sample formats.
#define FILTER_QUERY_FUNC2(func)
const char * name
Pad name.
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
static av_cold int config_props(AVFilterLink *outlink)
@ AV_OPT_TYPE_INT
Underlying C type is int.
AVFILTER_DEFINE_CLASS(hilbert)
#define AV_CHANNEL_LAYOUT_MONO
the definition of that something depends on the semantic of the filter The callback must examine the status of the filter s links and proceed accordingly The status of output links is stored in the status_in and status_out fields and tested by the ff_outlink_frame_wanted() function. If this function returns true