FFmpeg
vf_scroll.c
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1 /*
2  * Copyright (c) 2019 Paul B Mahol
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #include "libavutil/common.h"
22 #include "libavutil/opt.h"
23 #include "libavutil/pixdesc.h"
24 #include "avfilter.h"
25 #include "formats.h"
26 #include "internal.h"
27 
28 typedef struct ScrollContext {
29  const AVClass *class;
30 
31  float h_speed, v_speed;
32  float h_pos, v_pos;
33  float h_ipos, v_ipos;
34 
35  int pos_h[4], pos_v[4];
36 
38  int nb_planes;
39  int bytes;
40 
41  int planewidth[4];
42  int planeheight[4];
44 
46 {
47  static const enum AVPixelFormat pix_fmts[] = {
67  };
68 
69  AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);
70  if (!fmts_list)
71  return AVERROR(ENOMEM);
72  return ff_set_common_formats(ctx, fmts_list);
73 }
74 
75 typedef struct ThreadData {
76  AVFrame *in, *out;
77 } ThreadData;
78 
79 static int scroll_slice(AVFilterContext *ctx, void *arg, int jobnr,
80  int nb_jobs)
81 {
82  ScrollContext *s = ctx->priv;
83  ThreadData *td = arg;
84  AVFrame *in = td->in;
85  AVFrame *out = td->out;
86 
87  for (int p = 0; p < s->nb_planes; p++) {
88  const uint8_t *src = in->data[p];
89  const int h = s->planeheight[p];
90  const int w = s->planewidth[p] * s->bytes;
91  const int slice_start = (h * jobnr) / nb_jobs;
92  const int slice_end = (h * (jobnr+1)) / nb_jobs;
93  uint8_t *dst = out->data[p] + slice_start * out->linesize[p];
94 
95  for (int y = slice_start; y < slice_end; y++) {
96  int yy = (y + s->pos_v[p]) % h;
97  const uint8_t *ssrc = src + yy * in->linesize[p];
98 
99  if (s->pos_h[p] < w)
100  memcpy(dst, ssrc + s->pos_h[p], w - s->pos_h[p]);
101  if (s->pos_h[p] > 0)
102  memcpy(dst + w - s->pos_h[p], ssrc, s->pos_h[p]);
103 
104  dst += out->linesize[p];
105  }
106  }
107 
108  return 0;
109 }
110 
112 {
113  ScrollContext *s = ctx->priv;
114  ThreadData td;
115  int h_pos, v_pos;
116 
117  s->h_pos = fmodf(s->h_pos, in->width);
118  s->v_pos = fmodf(s->v_pos, in->height);
119 
120  h_pos = s->h_pos;
121  v_pos = s->v_pos;
122 
123  if (h_pos < 0)
124  h_pos += in->width;
125  if (v_pos < 0)
126  v_pos += in->height;
127 
128  s->pos_v[1] = s->pos_v[2] = AV_CEIL_RSHIFT(v_pos, s->desc->log2_chroma_h);
129  s->pos_v[0] = s->pos_v[3] = v_pos;
130  s->pos_h[1] = s->pos_h[2] = AV_CEIL_RSHIFT(h_pos, s->desc->log2_chroma_w) * s->bytes;
131  s->pos_h[0] = s->pos_h[3] = h_pos * s->bytes;
132 
133  td.in = in; td.out = out;
134  ctx->internal->execute(ctx, scroll_slice, &td, NULL,
136 
137  s->h_pos += s->h_speed * in->width;
138  s->v_pos += s->v_speed * in->height;
139 }
140 
142 {
143  AVFilterContext *ctx = inlink->dst;
144  AVFilterLink *outlink = ctx->outputs[0];
145  AVFrame *out;
146 
147  out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
148  if (!out) {
149  av_frame_free(&in);
150  return AVERROR(ENOMEM);
151  }
152  av_frame_copy_props(out, in);
153 
154  scroll(ctx, in, out);
155 
156  av_frame_free(&in);
157  return ff_filter_frame(outlink, out);
158 }
159 
161 {
162  AVFilterContext *ctx = inlink->dst;
163  ScrollContext *s = ctx->priv;
164 
165  s->desc = av_pix_fmt_desc_get(inlink->format);
166  s->nb_planes = s->desc->nb_components;
167  s->bytes = (s->desc->comp[0].depth + 7) >> 3;
168 
169  s->planeheight[1] = s->planeheight[2] = AV_CEIL_RSHIFT(inlink->h, s->desc->log2_chroma_h);
170  s->planeheight[0] = s->planeheight[3] = inlink->h;
171  s->planewidth[1] = s->planewidth[2] = AV_CEIL_RSHIFT(inlink->w, s->desc->log2_chroma_w);
172  s->planewidth[0] = s->planewidth[3] = inlink->w;
173 
174  s->h_pos = (1.f - s->h_ipos) * inlink->w;
175  s->v_pos = (1.f - s->v_ipos) * inlink->h;
176 
177  return 0;
178 }
179 
180 #define OFFSET(x) offsetof(ScrollContext, x)
181 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
182 #define VFT AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
183 
184 static const AVOption scroll_options[] = {
185  { "horizontal", "set the horizontal scrolling speed", OFFSET(h_speed), AV_OPT_TYPE_FLOAT, {.dbl=0.}, -1., 1., VFT },
186  { "h", "set the horizontal scrolling speed", OFFSET(h_speed), AV_OPT_TYPE_FLOAT, {.dbl=0.}, -1., 1., VFT },
187  { "vertical", "set the vertical scrolling speed", OFFSET(v_speed), AV_OPT_TYPE_FLOAT, {.dbl=0.}, -1., 1., VFT },
188  { "v", "set the vertical scrolling speed", OFFSET(v_speed), AV_OPT_TYPE_FLOAT, {.dbl=0.}, -1., 1., VFT },
189  { "hpos", "set initial horizontal position", OFFSET(h_ipos), AV_OPT_TYPE_FLOAT, {.dbl=0.}, 0, 1., FLAGS },
190  { "vpos", "set initial vertical position", OFFSET(v_ipos), AV_OPT_TYPE_FLOAT, {.dbl=0.}, 0, 1., FLAGS },
191  { NULL }
192 };
193 
195 
196 static const AVFilterPad scroll_inputs[] = {
197  {
198  .name = "default",
199  .type = AVMEDIA_TYPE_VIDEO,
200  .config_props = config_input,
201  .filter_frame = filter_frame,
202  },
203  { NULL }
204 };
205 
206 static const AVFilterPad scroll_outputs[] = {
207  {
208  .name = "default",
209  .type = AVMEDIA_TYPE_VIDEO,
210  },
211  { NULL }
212 };
213 
215  .name = "scroll",
216  .description = NULL_IF_CONFIG_SMALL("Scroll input video."),
217  .priv_size = sizeof(ScrollContext),
218  .priv_class = &scroll_class,
220  .inputs = scroll_inputs,
221  .outputs = scroll_outputs,
224 };
#define NULL
Definition: coverity.c:32
#define AV_PIX_FMT_YUVA422P16
Definition: pixfmt.h:437
AVFrame * out
Definition: af_adeclick.c:494
#define AV_PIX_FMT_YUVA422P9
Definition: pixfmt.h:429
const AVPixFmtDescriptor * av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:2526
This structure describes decoded (raw) audio or video data.
Definition: frame.h:295
AVOption.
Definition: opt.h:246
#define AV_PIX_FMT_YUVA420P10
Definition: pixfmt.h:431
#define AV_PIX_FMT_YUV444P14
Definition: pixfmt.h:404
#define AV_PIX_FMT_GBRAP10
Definition: pixfmt.h:414
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
Definition: vf_scroll.c:141
#define AV_PIX_FMT_YUVA422P10
Definition: pixfmt.h:432
planar YUV 4:4:4, 24bpp, (1 Cr & Cb sample per 1x1 Y samples)
Definition: pixfmt.h:71
Main libavfilter public API header.
int planewidth[4]
Definition: vf_scroll.c:41
AVFilter ff_vf_scroll
Definition: vf_scroll.c:214
#define FLAGS
Definition: vf_scroll.c:181
float h_pos
Definition: vf_scroll.c:32
planar GBR 4:4:4 24bpp
Definition: pixfmt.h:168
#define AV_PIX_FMT_GBRP10
Definition: pixfmt.h:410
#define AV_PIX_FMT_GRAY9
Definition: pixfmt.h:374
#define AV_PIX_FMT_YUV420P12
Definition: pixfmt.h:398
float h_ipos
Definition: vf_scroll.c:33
AVFrame * ff_get_video_buffer(AVFilterLink *link, int w, int h)
Request a picture buffer with a specific set of permissions.
Definition: video.c:99
#define src
Definition: vp8dsp.c:254
uint8_t log2_chroma_w
Amount to shift the luma width right to find the chroma width.
Definition: pixdesc.h:92
AVFilterFormats * ff_make_format_list(const int *fmts)
Create a list of supported formats.
Definition: formats.c:283
#define AV_PIX_FMT_GRAY10
Definition: pixfmt.h:375
#define AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC
Some filters support a generic "enable" expression option that can be used to enable or disable a fil...
Definition: avfilter.h:125
const char * name
Pad name.
Definition: internal.h:60
#define AV_PIX_FMT_GRAY12
Definition: pixfmt.h:376
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:1075
planar YUV 4:2:0, 20bpp, (1 Cr & Cb sample per 2x2 Y & A samples)
Definition: pixfmt.h:101
AVComponentDescriptor comp[4]
Parameters that describe how pixels are packed.
Definition: pixdesc.h:117
uint8_t
AVOptions.
#define AV_PIX_FMT_YUVA420P9
Definition: pixfmt.h:428
#define AV_PIX_FMT_GBRP9
Definition: pixfmt.h:409
#define OFFSET(x)
Definition: vf_scroll.c:180
planar YUV 4:4:0 full scale (JPEG), deprecated in favor of AV_PIX_FMT_YUV440P and setting color_range...
Definition: pixfmt.h:100
planar YUV 4:2:2, 16bpp, full scale (JPEG), deprecated in favor of AV_PIX_FMT_YUV422P and setting col...
Definition: pixfmt.h:79
#define VFT
Definition: vf_scroll.c:182
#define AV_PIX_FMT_YUV444P16
Definition: pixfmt.h:407
#define AV_PIX_FMT_YUV422P12
Definition: pixfmt.h:399
#define AV_PIX_FMT_YUVA420P16
Definition: pixfmt.h:436
static int query_formats(AVFilterContext *ctx)
Definition: vf_scroll.c:45
A filter pad used for either input or output.
Definition: internal.h:54
AVFILTER_DEFINE_CLASS(scroll)
planar YUV 4:2:2 24bpp, (1 Cr & Cb sample per 2x1 Y & A samples)
Definition: pixfmt.h:176
int width
Definition: frame.h:353
int ff_set_common_formats(AVFilterContext *ctx, AVFilterFormats *formats)
A helper for query_formats() which sets all links to the same list of formats.
Definition: formats.c:569
#define td
Definition: regdef.h:70
uint8_t log2_chroma_h
Amount to shift the luma height right to find the chroma height.
Definition: pixdesc.h:101
int pos_v[4]
Definition: vf_scroll.c:35
static int scroll_slice(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
Definition: vf_scroll.c:79
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:202
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
static void scroll(AVFilterContext *ctx, AVFrame *in, AVFrame *out)
Definition: vf_scroll.c:111
int ff_filter_process_command(AVFilterContext *ctx, const char *cmd, const char *arg, char *res, int res_len, int flags)
Generic processing of user supplied commands that are set in the same way as the filter options...
Definition: avfilter.c:869
void * priv
private data for use by the filter
Definition: avfilter.h:353
#define AVFILTER_FLAG_SLICE_THREADS
The filter supports multithreading by splitting frames into multiple parts and processing them concur...
Definition: avfilter.h:116
int planeheight[4]
Definition: vf_scroll.c:42
#define AV_PIX_FMT_YUVA444P16
Definition: pixfmt.h:438
const char * arg
Definition: jacosubdec.c:66
#define AV_PIX_FMT_GBRAP12
Definition: pixfmt.h:415
#define AV_PIX_FMT_YUV444P10
Definition: pixfmt.h:397
const AVPixFmtDescriptor * desc
Definition: vf_scroll.c:37
#define AV_PIX_FMT_GBRAP16
Definition: pixfmt.h:416
planar YUV 4:2:2, 16bpp, (1 Cr & Cb sample per 2x1 Y samples)
Definition: pixfmt.h:70
static const AVFilterPad scroll_outputs[]
Definition: vf_scroll.c:206
#define AV_PIX_FMT_YUV422P9
Definition: pixfmt.h:392
uint8_t nb_components
The number of components each pixel has, (1-4)
Definition: pixdesc.h:83
#define AV_PIX_FMT_GBRP16
Definition: pixfmt.h:413
int ff_filter_get_nb_threads(AVFilterContext *ctx)
Get number of threads for current filter instance.
Definition: avfilter.c:784
#define AV_PIX_FMT_GRAY16
Definition: pixfmt.h:378
#define FFMIN(a, b)
Definition: common.h:96
planar YUV 4:2:0, 12bpp, full scale (JPEG), deprecated in favor of AV_PIX_FMT_YUV420P and setting col...
Definition: pixfmt.h:78
#define AV_PIX_FMT_YUVA444P12
Definition: pixfmt.h:435
uint8_t w
Definition: llviddspenc.c:38
AVFormatContext * ctx
Definition: movenc.c:48
#define s(width, name)
Definition: cbs_vp9.c:257
static const AVFilterPad scroll_inputs[]
Definition: vf_scroll.c:196
#define AV_PIX_FMT_YUVA444P10
Definition: pixfmt.h:433
static int config_input(AVFilterLink *inlink)
Definition: vf_scroll.c:160
#define AV_PIX_FMT_YUV444P9
Definition: pixfmt.h:393
#define AV_PIX_FMT_GBRP14
Definition: pixfmt.h:412
static const AVFilterPad outputs[]
Definition: af_acontrast.c:203
#define AV_PIX_FMT_YUV420P16
Definition: pixfmt.h:405
#define AV_PIX_FMT_YUV420P14
Definition: pixfmt.h:402
Used for passing data between threads.
Definition: dsddec.c:64
float v_pos
Definition: vf_scroll.c:32
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:326
planar YUV 4:4:4 32bpp, (1 Cr & Cb sample per 1x1 Y & A samples)
Definition: pixfmt.h:177
Descriptor that unambiguously describes how the bits of a pixel are stored in the up to 4 data planes...
Definition: pixdesc.h:81
#define AV_PIX_FMT_GRAY14
Definition: pixfmt.h:377
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
#define AV_PIX_FMT_YUV420P10
Definition: pixfmt.h:394
planar YUV 4:1:0, 9bpp, (1 Cr & Cb sample per 4x4 Y samples)
Definition: pixfmt.h:72
Describe the class of an AVClass context structure.
Definition: log.h:67
Filter definition.
Definition: avfilter.h:144
float h_speed
Definition: vf_scroll.c:31
const char * name
Filter name.
Definition: avfilter.h:148
#define AV_PIX_FMT_YUV440P12
Definition: pixfmt.h:400
#define AV_PIX_FMT_YUV420P9
Definition: pixfmt.h:391
static const AVOption scroll_options[]
Definition: vf_scroll.c:184
AVFilterLink ** outputs
array of pointers to output links
Definition: avfilter.h:350
static enum AVPixelFormat pix_fmts[]
Definition: libkvazaar.c:275
#define AV_PIX_FMT_YUV422P14
Definition: pixfmt.h:403
#define AV_PIX_FMT_GBRP12
Definition: pixfmt.h:411
#define flags(name, subs,...)
Definition: cbs_av1.c:564
AVFilterInternal * internal
An opaque struct for libavfilter internal use.
Definition: avfilter.h:378
#define AV_PIX_FMT_YUV422P10
Definition: pixfmt.h:395
#define AV_PIX_FMT_YUV444P12
Definition: pixfmt.h:401
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:309
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
float v_speed
Definition: vf_scroll.c:31
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:66
Y , 8bpp.
Definition: pixfmt.h:74
common internal and external API header
planar GBRA 4:4:4:4 32bpp
Definition: pixfmt.h:215
#define AV_PIX_FMT_YUVA444P9
Definition: pixfmt.h:430
planar YUV 4:4:4, 24bpp, full scale (JPEG), deprecated in favor of AV_PIX_FMT_YUV444P and setting col...
Definition: pixfmt.h:80
planar YUV 4:1:1, 12bpp, (1 Cr & Cb sample per 4x1 Y samples)
Definition: pixfmt.h:73
avfilter_execute_func * execute
Definition: internal.h:144
static int slice_end(AVCodecContext *avctx, AVFrame *pict)
Handle slice ends.
Definition: mpeg12dec.c:2035
A list of supported formats for one end of a filter link.
Definition: formats.h:64
planar YUV 4:1:1, 12bpp, (1 Cr & Cb sample per 4x1 Y samples) full scale (JPEG), deprecated in favor ...
Definition: pixfmt.h:258
An instance of a filter.
Definition: avfilter.h:338
int height
Definition: frame.h:353
FILE * out
Definition: movenc.c:54
static int process_command(AVFilterContext *ctx, const char *cmd, const char *args, char *res, int res_len, int flags)
Definition: af_afftdn.c:1374
float v_ipos
Definition: vf_scroll.c:33
planar YUV 4:4:0 (1 Cr & Cb sample per 1x2 Y samples)
Definition: pixfmt.h:99
AVFrame * in
Definition: af_afftdn.c:1083
internal API 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
int depth
Number of bits in the component.
Definition: pixdesc.h:58
AVPixelFormat
Pixel format.
Definition: pixfmt.h:64
#define AV_PIX_FMT_YUV422P16
Definition: pixfmt.h:406
int av_frame_copy_props(AVFrame *dst, const AVFrame *src)
Copy only "metadata" fields from src to dst.
Definition: frame.c:654
int pos_h[4]
Definition: vf_scroll.c:35
#define AV_PIX_FMT_YUVA422P12
Definition: pixfmt.h:434
#define AV_CEIL_RSHIFT(a, b)
Definition: common.h:58