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35 #define OFFSET(x) offsetof(DCShiftContext, x)
36 #define A AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
50 s->limiterthreshold = INT32_MAX * (1.0 - (
fabs(
s->dcshift) -
s->limitergain));
62 double dcshift =
s->dcshift;
75 if (
s->limitergain > 0) {
76 for (
i = 0;
i <
inlink->ch_layout.nb_channels;
i++) {
85 if (d >
s->limiterthreshold && dcshift > 0) {
86 d = (d -
s->limiterthreshold) *
s->limitergain /
87 (INT32_MAX -
s->limiterthreshold) +
88 s->limiterthreshold + dcshift;
89 }
else if (d < -s->limiterthreshold && dcshift < 0) {
90 d = (d +
s->limiterthreshold) *
s->limitergain /
91 (INT32_MAX -
s->limiterthreshold) -
92 s->limiterthreshold + dcshift;
94 d = dcshift * INT32_MAX + d;
101 for (
i = 0;
i <
inlink->ch_layout.nb_channels;
i++) {
106 double d = dcshift * (INT32_MAX + 1.) +
src[j];
129 .priv_class = &dcshift_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.
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.
@ AV_SAMPLE_FMT_S32P
signed 32 bits, planar
const char * name
Filter name.
A link between two filters.
A filter pad used for either input or output.
@ AV_OPT_TYPE_DOUBLE
Underlying C type is double.
#define FILTER_OUTPUTS(array)
Describe the class of an AVClass context structure.
static __device__ float fabs(float a)
int av_frame_copy_props(AVFrame *dst, const AVFrame *src)
Copy only "metadata" fields from src to dst.
const AVFilterPad ff_audio_default_filterpad[1]
An AVFilterPad array whose only entry has name "default" and is of type AVMEDIA_TYPE_AUDIO.
static av_cold int init(AVFilterContext *ctx)
#define FILTER_SINGLE_SAMPLEFMT(sample_fmt_)
#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
int av_frame_is_writable(AVFrame *frame)
Check if the frame data is writable.
#define AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC
Some filters support a generic "enable" expression option that can be used to enable or disable a fil...
int nb_samples
number of audio samples (per channel) described by this frame
#define i(width, name, range_min, range_max)
uint8_t ** extended_data
pointers to the data planes/channels.
const char * name
Pad name.
const AVFilter ff_af_dcshift
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
AVFILTER_DEFINE_CLASS(dcshift)
static const AVOption dcshift_options[]
static const AVFilterPad dcshift_inputs[]