68 #define OFFSET(x) offsetof(EdgeDetectContext, x) 69 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM 93 edgedetect->
low_u8 = edgedetect->
low * 255. + .5;
108 pix_fmts = wires_pix_fmts;
110 pix_fmts = colormix_pix_fmts;
112 pix_fmts = canny_pix_fmts;
130 for (p = 0; p < edgedetect->
nb_planes; p++) {
147 uint8_t *dst,
int dst_linesize,
152 memcpy(dst, src, w); dst += dst_linesize; src += src_linesize;
154 memcpy(dst, src, w); dst += dst_linesize; src += src_linesize;
156 for (j = 2; j < h - 2; j++) {
160 for (i = 2; i < w - 2; i++) {
162 dst[
i] = ((src[-2*src_linesize + i-2] + src[2*src_linesize + i-2]) * 2
163 + (src[-2*src_linesize + i-1] + src[2*src_linesize + i-1]) * 4
164 + (src[-2*src_linesize +
i ] + src[2*src_linesize +
i ]) * 5
165 + (src[-2*src_linesize + i+1] + src[2*src_linesize + i+1]) * 4
166 + (src[-2*src_linesize + i+2] + src[2*src_linesize + i+2]) * 2
168 + (src[ -src_linesize + i-2] + src[ src_linesize + i-2]) * 4
169 + (src[ -src_linesize + i-1] + src[ src_linesize + i-1]) * 9
170 + (src[ -src_linesize + i ] + src[ src_linesize + i ]) * 12
171 + (src[ -src_linesize + i+1] + src[ src_linesize + i+1]) * 9
172 + (src[ -src_linesize + i+2] + src[ src_linesize + i+2]) * 4
178 + src[i+2] * 5) / 159;
183 dst[i + 1] = src[i + 1];
189 memcpy(dst, src, w); dst += dst_linesize; src += src_linesize;
215 int tanpi8gx, tan3pi8gx;
220 tanpi8gx = 27146 * gx;
221 tan3pi8gx = 158218 * gx;
230 uint16_t *dst,
int dst_linesize,
231 int8_t *dir,
int dir_linesize,
236 for (j = 1; j < h - 1; j++) {
240 for (i = 1; i < w - 1; i++) {
242 -1*src[-src_linesize + i-1] + 1*src[-src_linesize + i+1]
243 -2*src[ i-1] + 2*src[ i+1]
244 -1*src[ src_linesize + i-1] + 1*src[ src_linesize + i+1];
246 -1*src[-src_linesize + i-1] + 1*src[ src_linesize + i-1]
247 -2*src[-src_linesize +
i ] + 2*src[ src_linesize +
i ]
248 -1*src[-src_linesize + i+1] + 1*src[ src_linesize + i+1];
257 uint8_t *dst,
int dst_linesize,
258 const int8_t *dir,
int dir_linesize,
259 const uint16_t *
src,
int src_linesize)
263 #define COPY_MAXIMA(ay, ax, by, bx) do { \ 264 if (src[i] > src[(ay)*src_linesize + i+(ax)] && \ 265 src[i] > src[(by)*src_linesize + i+(bx)]) \ 266 dst[i] = av_clip_uint8(src[i]); \ 269 for (j = 1; j < h - 1; j++) {
273 for (i = 1; i < w - 1; i++) {
285 uint8_t *dst,
int dst_linesize,
290 for (j = 0; j <
h; j++) {
291 for (i = 0; i <
w; i++) {
297 if (!(!i || i == w - 1 || !j || j == h - 1) &&
299 (src[-src_linesize + i-1] > high ||
300 src[-src_linesize + i ] > high ||
301 src[-src_linesize + i+1] > high ||
304 src[ src_linesize + i-1] > high ||
305 src[ src_linesize + i ] > high ||
306 src[ src_linesize + i+1] > high))
317 uint8_t *dst,
int dst_linesize,
322 for (j = 0; j <
h; j++) {
323 for (i = 0; i <
w; i++)
324 dst[i] = (dst[i] + src[i]) >> 1;
350 for (p = 0; p < edgedetect->
nb_planes; p++) {
379 memset(tmpbuf, 0, width * height);
408 for (p = 0; p < edgedetect->
nb_planes; p++) {
435 .
name =
"edgedetect",
441 .
inputs = edgedetect_inputs,
443 .priv_class = &edgedetect_class,
static const AVFilterPad edgedetect_outputs[]
const AVPixFmtDescriptor * av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
static av_cold void uninit(AVFilterContext *ctx)
This structure describes decoded (raw) audio or video data.
planar YUV 4:4:4, 24bpp, (1 Cr & Cb sample per 1x1 Y samples)
Main libavfilter public API header.
static void sobel(int w, int h, uint16_t *dst, int dst_linesize, int8_t *dir, int dir_linesize, const uint8_t *src, int src_linesize)
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 const struct @322 planes[]
uint8_t log2_chroma_w
Amount to shift the luma width right to find the chroma width.
void * av_calloc(size_t nmemb, size_t size)
Non-inlined equivalent of av_mallocz_array().
static void double_threshold(int low, int high, int w, int h, uint8_t *dst, int dst_linesize, const uint8_t *src, int src_linesize)
#define AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC
Some filters support a generic "enable" expression option that can be used to enable or disable a fil...
const char * name
Pad name.
#define av_assert0(cond)
assert() equivalent, that is always enabled.
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
This document is a tutorial initiation for writing simple filters in libavfilter libavfilter is which means that it is highly recommended that you submit your filters to the FFmpeg development mailing list and make sure that they are applied your filters are likely to have a very short lifetime due to more or less regular internal API and a limited and testing changes the pixels in whatever fashion you and outputs the modified frame The most simple way of doing this is to take a similar filter We ll pick edgedetect
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
static int query_formats(AVFilterContext *ctx)
AVFILTER_DEFINE_CLASS(edgedetect)
A filter pad used for either input or output.
A link between two filters.
uint8_t log2_chroma_h
Amount to shift the luma height right to find the chroma height.
static const AVOption edgedetect_options[]
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 * priv
private data for use by the filter
static void direct(const float *in, const FFTComplex *ir, int len, float *out)
simple assert() macros that are a bit more flexible than ISO C assert().
static int config_props(AVFilterLink *inlink)
AVFilter ff_vf_edgedetect
planar YUV 4:2:2, 16bpp, (1 Cr & Cb sample per 2x1 Y samples)
int w
agreed upon image width
static void gaussian_blur(AVFilterContext *ctx, int w, int h, uint8_t *dst, int dst_linesize, const uint8_t *src, int src_linesize)
#define FFABS(a)
Absolute value, Note, INT_MIN / INT64_MIN result in undefined behavior as they are not representable ...
static int get_rounded_direction(int gx, int gy)
static const AVFilterPad outputs[]
int format
agreed upon media format
static const AVFilterPad edgedetect_inputs[]
static av_cold int init(AVFilterContext *ctx)
int av_frame_is_writable(AVFrame *frame)
Check if the frame data is writable.
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
struct plane_info planes[3]
Descriptor that unambiguously describes how the bits of a pixel are stored in the up to 4 data planes...
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
uint8_t pi<< 24) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_U8, uint8_t,(*(const uint8_t *) pi-0x80)*(1.0f/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_U8, uint8_t,(*(const uint8_t *) pi-0x80)*(1.0/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S16, int16_t,(*(const int16_t *) pi >> 8)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S16, int16_t,*(const int16_t *) pi *(1.0f/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S16, int16_t,*(const int16_t *) pi *(1.0/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S32, int32_t,(*(const int32_t *) pi >> 24)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S32, int32_t,*(const int32_t *) pi *(1.0f/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S32, int32_t,*(const int32_t *) pi *(1.0/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_FLT, float, av_clip_uint8(lrintf(*(const float *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_FLT, float, av_clip_int16(lrintf(*(const float *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_FLT, float, av_clipl_int32(llrintf(*(const float *) pi *(1U<< 31)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_DBL, double, av_clip_uint8(lrint(*(const double *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_DBL, double, av_clip_int16(lrint(*(const double *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_DBL, double, av_clipl_int32(llrint(*(const double *) pi *(1U<< 31))))#define SET_CONV_FUNC_GROUP(ofmt, ifmt) static void set_generic_function(AudioConvert *ac){}void ff_audio_convert_free(AudioConvert **ac){if(!*ac) return;ff_dither_free(&(*ac) ->dc);av_freep(ac);}AudioConvert *ff_audio_convert_alloc(AVAudioResampleContext *avr, enum AVSampleFormat out_fmt, enum AVSampleFormat in_fmt, int channels, int sample_rate, int apply_map){AudioConvert *ac;int in_planar, out_planar;ac=av_mallocz(sizeof(*ac));if(!ac) return NULL;ac->avr=avr;ac->out_fmt=out_fmt;ac->in_fmt=in_fmt;ac->channels=channels;ac->apply_map=apply_map;if(avr->dither_method!=AV_RESAMPLE_DITHER_NONE &&av_get_packed_sample_fmt(out_fmt)==AV_SAMPLE_FMT_S16 &&av_get_bytes_per_sample(in_fmt) > 2){ac->dc=ff_dither_alloc(avr, out_fmt, in_fmt, channels, sample_rate, apply_map);if(!ac->dc){av_free(ac);return NULL;}return ac;}in_planar=ff_sample_fmt_is_planar(in_fmt, channels);out_planar=ff_sample_fmt_is_planar(out_fmt, channels);if(in_planar==out_planar){ac->func_type=CONV_FUNC_TYPE_FLAT;ac->planes=in_planar?ac->channels:1;}else if(in_planar) ac->func_type=CONV_FUNC_TYPE_INTERLEAVE;else ac->func_type=CONV_FUNC_TYPE_DEINTERLEAVE;set_generic_function(ac);if(ARCH_AARCH64) ff_audio_convert_init_aarch64(ac);if(ARCH_ARM) ff_audio_convert_init_arm(ac);if(ARCH_X86) ff_audio_convert_init_x86(ac);return ac;}int ff_audio_convert(AudioConvert *ac, AudioData *out, AudioData *in){int use_generic=1;int len=in->nb_samples;int p;if(ac->dc){av_log(ac->avr, AV_LOG_TRACE,"%d samples - audio_convert: %s to %s (dithered)\n", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt));return ff_convert_dither(ac-> in
Describe the class of an AVClass context structure.
const char * name
Filter name.
AVFilterLink ** outputs
array of pointers to output links
#define COPY_MAXIMA(ay, ax, by, bx)
static enum AVPixelFormat pix_fmts[]
#define flags(name, subs,...)
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
static void non_maximum_suppression(int w, int h, uint8_t *dst, int dst_linesize, const int8_t *dir, int dir_linesize, const uint16_t *src, int src_linesize)
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
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
AVFilterContext * dst
dest filter
static void color_mix(int w, int h, uint8_t *dst, int dst_linesize, const uint8_t *src, int src_linesize)
void av_image_copy_plane(uint8_t *dst, int dst_linesize, const uint8_t *src, int src_linesize, int bytewidth, int height)
Copy image plane from src to dst.
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.
mode
Use these values in ebur128_init (or'ed).
int av_frame_copy_props(AVFrame *dst, const AVFrame *src)
Copy only "metadata" fields from src to dst.
#define AV_CEIL_RSHIFT(a, b)