47 #define OFFSET(x) offsetof(AMergeContext, x) 48 #define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM 87 "No channel layout for input %d\n", i + 1);
101 if (outlayout & inlayout[i])
103 outlayout |= inlayout[
i];
113 "Input channel layouts overlap: " 114 "output layout will be determined by the number of distinct input channels\n");
115 for (i = 0; i <
nb_ch; i++)
118 if (!outlayout && nb_ch)
119 outlayout = 0xFFFFFFFFFFFFFFFFULL >> (64 -
nb_ch);
122 int c, out_ch_number = 0;
126 route[i] = route[i - 1] + s->
in[i - 1].
nb_ch;
127 for (c = 0; c < 64; c++)
129 if ((inlayout[i] >> c) & 1)
130 *(route[i]++) = out_ch_number++;
161 "Inputs must have the same sample rate " 162 "%d for in%d vs %d\n",
173 av_bprintf(&bp,
"%sin%d:", i ?
" + " :
"", i);
207 nb_ch += in[i].nb_ch;
211 for (c = 0; c < in[
i].nb_ch; c++) {
212 memcpy((*outs) + bps * *(route_cur++), ins[i], bps);
216 *outs += nb_ch *
bps;
241 ins[
i] = inbuf[
i]->
data[0];
250 outs = outbuf->
data[0];
251 outbuf->
pts = inbuf[0]->
pts;
291 for (i = 1; i < ctx->
nb_inputs && nb_samples > 0; i++) {
353 "a single multi-channel stream."),
361 .priv_class = &amerge_class,
struct AMergeContext::amerge_input * in
void av_bprintf(AVBPrint *buf, const char *fmt,...)
int nb_ch
number of channels for the input
This structure describes decoded (raw) audio or video data.
#define AV_LOG_WARNING
Something somehow does not look correct.
#define FF_FILTER_FORWARD_STATUS_BACK_ALL(outlink, filter)
Forward the status on an output link to all input links.
Main libavfilter public API header.
#define AVFILTER_FLAG_DYNAMIC_INPUTS
The number of the filter inputs is not determined just by AVFilter.inputs.
AVFILTER_DEFINE_CLASS(amerge)
AVFilterFormatsConfig outcfg
Lists of supported formats / etc.
static void ff_outlink_set_status(AVFilterLink *link, int status, int64_t pts)
Set the status field of a link from the source filter.
void ff_inlink_request_frame(AVFilterLink *link)
Mark that a frame is wanted on the link.
void * av_calloc(size_t nmemb, size_t size)
Non-inlined equivalent of av_mallocz_array().
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.
AVFilterLink ** inputs
array of pointers to input links
static int activate(AVFilterContext *ctx)
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
int64_t pts
Presentation timestamp in time_base units (time when frame should be shown to user).
static av_cold int init(AVFilterContext *ctx)
#define AV_LOG_VERBOSE
Detailed information.
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
static void free_frames(int nb_inputs, AVFrame **input_frames)
static av_cold void uninit(AVFilterContext *ctx)
A filter pad used for either input or output.
A link between two filters.
int ff_inlink_acknowledge_status(AVFilterLink *link, int *rstatus, int64_t *rpts)
Test and acknowledge the change of status on the link.
static const AVFilterPad amerge_outputs[]
AVFilterPad * input_pads
array of input pads
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
static const AVOption amerge_options[]
int sample_rate
samples per second
AVFrame * ff_get_audio_buffer(AVFilterLink *link, int nb_samples)
Request an audio samples buffer with a specific set of permissions.
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
void av_bprint_init(AVBPrint *buf, unsigned size_init, unsigned size_max)
void * priv
private data for use by the filter
uint64_t * channel_layouts
list of channel layouts
AVRational time_base
Define the time base used by the PTS of the frames/samples which will pass through this link...
uint64_t channel_layout
Channel layout of the audio data.
char * av_asprintf(const char *fmt,...)
static int config_output(AVFilterLink *outlink)
int channels
number of audio channels, only used for audio.
audio channel layout utility functions
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
unsigned nb_inputs
number of input pads
int ff_inlink_queued_samples(AVFilterLink *link)
AVFilterContext * src
source filter
static int try_push_frame(AVFilterContext *ctx, int nb_samples)
static const AVFilterPad outputs[]
int format
agreed upon media format
A list of supported channel layouts.
void av_bprint_channel_layout(struct AVBPrint *bp, int nb_channels, uint64_t channel_layout)
Append a description of a channel layout to a bprint buffer.
void av_get_channel_layout_string(char *buf, int buf_size, int nb_channels, uint64_t channel_layout)
Return a description of a channel layout.
static int query_formats(AVFilterContext *ctx)
#define AV_LOG_INFO
Standard information.
#define AV_BPRINT_SIZE_AUTOMATIC
AVSampleFormat
Audio sample formats.
int ff_inlink_consume_samples(AVFilterLink *link, unsigned min, unsigned max, AVFrame **rframe)
Take samples from the link's FIFO and update the link's stats.
Describe the class of an AVClass context structure.
they must not be accessed directly The fifo field contains the frames that are queued in the input for processing by the filter The status_in and status_out fields contains the queued status(EOF or error) of the link
const char * name
Filter name.
AVFilterLink ** outputs
array of pointers to output links
enum MovChannelLayoutTag * layouts
#define flags(name, subs,...)
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
int av_get_bytes_per_sample(enum AVSampleFormat sample_fmt)
Return number of bytes per sample.
#define ns(max_value, name, subs,...)
int nb_channel_layouts
number of channel layouts
uint64_t channel_layout
channel layout of current buffer (see libavutil/channel_layout.h)
int channels
Number of channels.
AVFilterFormatsConfig incfg
Lists of supported formats / etc.
int route[SWR_CH_MAX]
channels routing, see copy_samples
int64_t av_get_default_channel_layout(int nb_channels)
Return default channel layout for a given number of channels.
static void copy_samples(int nb_inputs, struct amerge_input in[], int *route, uint8_t *ins[], uint8_t **outs, int ns, int bps)
Copy samples from several input streams to one output stream.
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 nb_samples
number of audio samples (per channel) described by this frame
static int ff_insert_inpad(AVFilterContext *f, unsigned index, AVFilterPad *p)
Insert a new input pad for the filter.