80 int w = inlink->
w,
h = inlink->
h;
97 "filter params: %d.\n", ret);
126 #define BLUR(type, depth) \ 127 static inline void blur ## depth(type *dst, int dst_step, const type *src, \ 128 int src_step, int len, int radius) \ 130 const int length = radius*2 + 1; \ 131 const int inv = ((1<<16) + length/2)/length; \ 132 int x, sum = src[radius*src_step]; \ 134 for (x = 0; x < radius; x++) \ 135 sum += src[x*src_step]<<1; \ 137 sum = sum*inv + (1<<15); \ 139 for (x = 0; x <= radius; x++) { \ 140 sum += (src[(radius+x)*src_step] - src[(radius-x)*src_step])*inv; \ 141 dst[x*dst_step] = sum>>16; \ 144 for (; x < len-radius; x++) { \ 145 sum += (src[(radius+x)*src_step] - src[(x-radius-1)*src_step])*inv; \ 146 dst[x*dst_step] = sum >>16; \ 149 for (; x < len; x++) { \ 150 sum += (src[(2*len-radius-x-1)*src_step] - src[(x-radius-1)*src_step])*inv; \ 151 dst[x*dst_step] = sum>>16; \ 163 if (pixsize == 1) blur8 (dst, dst_step , src, src_step , len, radius);
164 else blur16((uint16_t*)dst, dst_step>>1, (
const uint16_t*)src, src_step>>1, len, radius);
172 if (radius && power) {
173 blur(a, pixsize, src, src_step, len, radius, pixsize);
174 for (; power > 2; power--) {
176 blur(b, pixsize, a, pixsize, len, radius, pixsize);
180 blur(dst, dst_step, a, pixsize, len, radius, pixsize);
184 for (i = 0; i <
len; i++)
185 dst[i*dst_step] = a[i];
187 for (i = 0; i <
len; i++)
188 *(uint16_t*)(dst + i*dst_step) = ((uint16_t*)
a)[i];
193 for (i = 0; i <
len; i++)
194 dst[i*dst_step] = src[i*src_step];
196 for (i = 0; i <
len; i++)
197 *(uint16_t*)(dst + i*dst_step) = *(uint16_t*)(src + i*src_step);
206 if (radius == 0 && dst == src)
209 for (y = 0; y <
h; y++)
210 blur_power(dst + y*dst_linesize, pixsize, src + y*src_linesize, pixsize,
211 w, radius, power, temp, pixsize);
219 if (radius == 0 && dst == src)
222 for (x = 0; x <
w; x++)
223 blur_power(dst + x*pixsize, dst_linesize, src + x*pixsize, src_linesize,
224 h, radius, power, temp, pixsize);
235 int w[4] = { inlink->
w, cw, cw, inlink->
w };
239 const int pixsize = (depth+7)/8;
248 for (plane = 0; plane < 4 && in->
data[plane] && in->
linesize[plane]; plane++)
251 w[plane], h[plane], s->
radius[plane], s->
power[plane],
254 for (plane = 0; plane < 4 && in->
data[plane] && in->
linesize[plane]; plane++)
257 w[plane], h[plane], s->
radius[plane], s->
power[plane],
265 #define OFFSET(x) offsetof(BoxBlurContext, x) 266 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM 311 .priv_class = &boxblur_class,
314 .
inputs = avfilter_vf_boxblur_inputs,
315 .
outputs = avfilter_vf_boxblur_outputs,
#define AV_PIX_FMT_FLAG_PAL
Pixel format has a palette in data[1], values are indexes in this palette.
static void hblur(uint8_t *dst, int dst_linesize, const uint8_t *src, int src_linesize, int w, int h, int radius, int power, uint8_t *temp[2], int pixsize)
const AVPixFmtDescriptor * av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
This structure describes decoded (raw) audio or video data.
Main libavfilter public API header.
static int config_input(AVFilterLink *inlink)
int h
agreed upon image height
static void blur(uint8_t *dst, int dst_step, const uint8_t *src, int src_step, int len, int radius, int pixsize)
The reader does not expect b to be semantically here and if the code is changed by maybe adding a a division or other the signedness will almost certainly be mistaken To avoid this confusion a new type was SUINT is the C unsigned type but it holds a signed int to use the same example SUINT a
AVFrame * ff_get_video_buffer(AVFilterLink *link, int w, int h)
Request a picture buffer with a specific set of permissions.
uint8_t log2_chroma_w
Amount to shift the luma width right to find the chroma width.
#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.
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
AVComponentDescriptor comp[4]
Parameters that describe how pixels are packed.
uint8_t * temp[2]
temporary buffer used in blur_power()
int ff_boxblur_eval_filter_params(AVFilterLink *inlink, FilterParam *luma_param, FilterParam *chroma_param, FilterParam *alpha_param)
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
static const AVFilterPad avfilter_vf_boxblur_outputs[]
static const AVOption boxblur_options[]
static void blur_power(uint8_t *dst, int dst_step, const uint8_t *src, int src_step, int len, int radius, int power, uint8_t *temp[2], int pixsize)
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.
uint8_t log2_chroma_h
Amount to shift the luma height right to find the chroma height.
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 int query_formats(AVFilterContext *ctx)
#define AV_PIX_FMT_FLAG_HWACCEL
Pixel format is an HW accelerated format.
static const AVFilterPad avfilter_vf_boxblur_inputs[]
int w
agreed upon image width
uint64_t flags
Combination of AV_PIX_FMT_FLAG_...
uint8_t nb_components
The number of components each pixel has, (1-4)
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
#define BLUR(type, depth)
static const AVFilterPad outputs[]
int format
agreed upon media format
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
Descriptor that unambiguously describes how the bits of a pixel are stored in the up to 4 data planes...
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.
static void vblur(uint8_t *dst, int dst_linesize, const uint8_t *src, int src_linesize, int w, int h, int radius, int power, uint8_t *temp[2], int pixsize)
static av_cold void uninit(AVFilterContext *ctx)
const char * name
Filter name.
AVFILTER_DEFINE_CLASS(boxblur)
#define AV_PIX_FMT_FLAG_BITSTREAM
All values of a component are bit-wise packed end to end.
AVFilterLink ** outputs
array of pointers to output links
#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
common internal and external API header
#define AV_PIX_FMT_FLAG_BE
Pixel format is big-endian.
AVFilterContext * dst
dest filter
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 depth
Number of bits in the component.
#define AV_PIX_FMT_FLAG_PLANAR
At least one pixel component is not in the first data plane.
int av_frame_copy_props(AVFrame *dst, const AVFrame *src)
Copy only "metadata" fields from src to dst.
#define AV_CEIL_RSHIFT(a, b)