60 #define OFFSET(x) offsetof(CellAutoContext, x) 61 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM 96 for (i = 0; i < s->
w; i++)
97 line[i] = row[i] ?
'@' :
' ';
116 "The specified width is %d which cannot contain the provided string width of %d\n",
132 for (i = (s->
w - w)/2;; i++) {
134 if (*p ==
'\n' || !*p)
172 av_log(ctx,
AV_LOG_ERROR,
"Only one of the filename or pattern options can be used\n");
194 for (i = 0; i < s->
w; i++) {
202 "s:%dx%d r:%d/%d rule:%d stitch:%d scroll:%d full:%d seed:%"PRId64
"\n",
240 for (i = 0; i < s->
w; i++) {
242 pos[NW] = i-1 < 0 ? s->
w-1 : i-1;
244 pos[NE] = i+1 == s->
w ? 0 : i+1;
245 v = prev_row[pos[NW]]<<2 | prev_row[pos[
N]]<<1 | prev_row[pos[NE]];
248 v|= i-1 >= 0 ? prev_row[i-1]<<2 : 0;
249 v|= prev_row[
i ]<<1 ;
250 v|= i+1 < s->
w ? prev_row[i+1] : 0;
252 row[
i] = !!(s->
rule & (1<<v));
253 ff_dlog(ctx,
"i:%d context:%c%c%c -> cell:%d\n", i,
254 v&4?
'@':
' ', v&2?
'@':
' ', v&1?
'@':
' ', row[i]);
263 int i, j, k, row_idx = 0;
271 for (i = 0; i < s->
h; i++) {
275 for (k = 0, j = 0; j < s->
w; j++) {
276 byte |= row[j]<<(7-k++);
277 if (k==8 || j == s->
w-1) {
283 row_idx = (row_idx + 1) % s->
h;
297 for (i = 0; i < s->
h-1; i++)
306 show_cellauto_row(outlink->
src);
332 .description =
NULL_IF_CONFIG_SMALL(
"Create pattern generated by an elementary cellular automaton."),
334 .priv_class = &cellauto_class,
Context structure for the Lagged Fibonacci PRNG.
static int request_frame(AVFilterLink *outlink)
This structure describes decoded (raw) audio or video data.
Main libavfilter public API header.
int h
agreed upon image height
AVFrame * ff_get_video_buffer(AVFilterLink *link, int w, int h)
Request a picture buffer with a specific set of permissions.
static av_cold int init(AVFilterContext *ctx)
const char * name
Pad name.
static const AVFilterPad cellauto_outputs[]
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
int64_t pts
Presentation timestamp in time_base units (time when frame should be shown to user).
static int config_props(AVFilterLink *outlink)
#define AV_LOG_VERBOSE
Detailed information.
A filter pad used for either input or output.
A link between two filters.
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
void av_file_unmap(uint8_t *bufptr, size_t size)
Unmap or free the buffer bufptr created by av_file_map().
int av_file_map(const char *filename, uint8_t **bufptr, size_t *size, int log_offset, void *log_ctx)
Read the file with name filename, and put its content in a newly allocated buffer or map it with mmap...
#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
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
AVRational time_base
Define the time base used by the PTS of the frames/samples which will pass through this link...
static int init_pattern_from_file(AVFilterContext *ctx)
int w
agreed upon image width
static void fill_picture(AVFilterContext *ctx, AVFrame *picref)
common internal API header
static void evolve(AVFilterContext *ctx)
AVFilter ff_vsrc_cellauto
AVFilterContext * src
source filter
static const AVFilterPad outputs[]
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_WB32 unsigned int_TMPL AV_WB24 unsigned int_TMPL AV_WB16 unsigned int_TMPL byte
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
AVRational sample_aspect_ratio
Sample aspect ratio for the video frame, 0/1 if unknown/unspecified.
static unsigned int av_lfg_get(AVLFG *c)
Get the next random unsigned 32-bit number using an ALFG.
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.
Rational number (pair of numerator and denominator).
static int query_formats(AVFilterContext *ctx)
offset must point to AVRational
const char * name
Filter name.
av_cold void av_lfg_init(AVLFG *c, unsigned int seed)
offset must point to two consecutive integers
static enum AVPixelFormat pix_fmts[]
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
static av_always_inline AVRational av_inv_q(AVRational q)
Invert a rational.
static av_const int av_isgraph(int c)
Locale-independent conversion of ASCII isgraph.
Y , 1bpp, 0 is black, 1 is white, in each byte pixels are ordered from the msb to the lsb...
static int init_pattern_from_string(AVFilterContext *ctx)
static const AVOption cellauto_options[]
int64_t generation
the generation number, starting from 0
static av_cold void uninit(AVFilterContext *ctx)
AVFILTER_DEFINE_CLASS(cellauto)
uint32_t av_get_random_seed(void)
Get a seed to use in conjunction with random functions.
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
AVPixelFormat
Pixel format.
int av_opt_set(void *obj, const char *name, const char *val, int search_flags)
void * av_mallocz_array(size_t nmemb, size_t size)