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31 #define DERIVATIVE(name, type) \
32 static void aderivative_## name ##p(void **d, void **p, const void **s, \
33 int nb_samples, int channels) \
37 for (c = 0; c < channels; c++) { \
38 const type *src = s[c]; \
42 for (n = 0; n < nb_samples; n++) { \
43 const type current = src[n]; \
45 dst[n] = current - prv[0]; \
56 #define INTEGRAL(name, type) \
57 static void aintegral_## name ##p(void **d, void **p, const void **s, \
58 int nb_samples, int channels) \
62 for (c = 0; c < channels; c++) { \
63 const type *src = s[c]; \
67 for (n = 0; n < nb_samples; n++) { \
68 const type current = src[n]; \
70 dst[n] = current + prv[0]; \
91 if (strcmp(
ctx->filter->name,
"aintegral"))
109 if (
ctx->is_disabled) {
112 s->prev->ch_layout.nb_channels,
134 s->filter((
void **)
out->extended_data, (
void **)
s->prev->extended_data, (
const void **)in->
extended_data,
164 .
name =
"aderivative",
167 .priv_class = &aderivative_class,
180 .priv_class = &aderivative_class,
AVFrame * ff_get_audio_buffer(AVFilterLink *link, int nb_samples)
Request an audio samples buffer with a specific set of permissions.
@ AV_SAMPLE_FMT_FLTP
float, planar
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.
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.
#define FILTER_INPUTS(array)
This structure describes decoded (raw) audio or video data.
int av_samples_set_silence(uint8_t *const *audio_data, int offset, int nb_samples, int nb_channels, enum AVSampleFormat sample_fmt)
Fill an audio buffer with silence.
@ AV_SAMPLE_FMT_S32P
signed 32 bits, planar
void(* filter)(void **dst, void **prv, const void **src, int nb_samples, int channels)
const char * name
Filter name.
int nb_channels
Number of channels in this layout.
A link between two filters.
static const AVOption aderivative_options[]
AVChannelLayout ch_layout
Channel layout of the audio data.
static const AVFilterPad aderivative_inputs[]
A filter pad used for either input or output.
#define FILTER_SAMPLEFMTS(...)
const AVFilter ff_af_aintegral
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
static int config_input(AVFilterLink *inlink)
#define FILTER_OUTPUTS(array)
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.
AVFILTER_DEFINE_CLASS_EXT(aderivative, "aderivative/aintegral", aderivative_options)
#define INTEGRAL(name, type)
const AVFilterPad ff_audio_default_filterpad[1]
An AVFilterPad array whose only entry has name "default" and is of type AVMEDIA_TYPE_AUDIO.
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
uint8_t ptrdiff_t const uint8_t ptrdiff_t int intptr_t intptr_t int int16_t * dst
const AVFilter ff_af_aderivative
@ AV_SAMPLE_FMT_S16P
signed 16 bits, planar
int nb_samples
number of audio samples (per channel) described by this frame
uint8_t ** extended_data
pointers to the data planes/channels.
static av_cold void uninit(AVFilterContext *ctx)
const char * name
Pad name.
@ AV_SAMPLE_FMT_DBLP
double, planar
#define DERIVATIVE(name, type)
#define AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL
Same as AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC, except that the filter will have its filter_frame() c...