46 #define OFFSET(x) offsetof(ChannelSplitContext, x) 47 #define A AV_OPT_FLAG_AUDIO_PARAM 48 #define F AV_OPT_FLAG_FILTERING_PARAM 62 int all = 0,
ret = 0,
i;
172 .
name =
"channelsplit",
175 .priv_class = &channelsplit_class,
178 .
inputs = avfilter_af_channelsplit_inputs,
This structure describes decoded (raw) audio or video data.
Main libavfilter public API header.
enum AVMediaType type
AVFilterPad type.
AVFilterFormatsConfig outcfg
Lists of supported formats / etc.
Macro definitions for various function/variable attributes.
int av_get_channel_layout_nb_channels(uint64_t channel_layout)
Return the number of channels in the channel layout.
const char * name
Pad name.
uint64_t av_get_channel_layout(const char *name)
Return a channel layout id that matches name, or 0 if no match is found.
AVFilterLink ** inputs
array of pointers to input links
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
#define AVFILTER_FLAG_DYNAMIC_OUTPUTS
The number of the filter outputs is not determined just by AVFilter.outputs.
A filter pad used for either input or output.
AVFILTER_DEFINE_CLASS(channelsplit)
A link between two filters.
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
unsigned nb_outputs
number of output pads
#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
static const AVFilterPad avfilter_af_channelsplit_inputs[]
uint64_t channel_layout
Channel layout of the audio data.
common internal API header
int channels
number of audio channels, only used for audio.
audio channel layout utility functions
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 int filter_frame(AVFilterLink *inlink, AVFrame *buf)
char * channel_layout_str
static const AVOption channelsplit_options[]
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.
static av_cold int init(AVFilterContext *ctx)
AVFilterLink ** outputs
array of pointers to output links
int av_get_channel_layout_channel_index(uint64_t channel_layout, uint64_t channel)
Get the index of a channel in channel_layout.
#define flags(name, subs,...)
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
uint64_t av_channel_layout_extract_channel(uint64_t channel_layout, int index)
Get the channel with the given index in channel_layout.
channel
Use these values when setting the channel map with ebur128_set_channel().
AVFilterFormatsConfig incfg
Lists of supported formats / etc.
const char * av_get_channel_name(uint64_t channel)
Get the name of a given channel.
AVFilterContext * dst
dest filter
static int query_formats(AVFilterContext *ctx)
AVFilter ff_af_channelsplit
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.
static int ff_insert_outpad(AVFilterContext *f, unsigned index, AVFilterPad *p)
Insert a new output pad for the filter.
int av_get_extended_channel_layout(const char *name, uint64_t *channel_layout, int *nb_channels)
Return a channel layout and the number of channels based on the specified name.