FFmpeg
vf_stack.c
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1 /*
2  * Copyright (c) 2015 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/avstring.h"
22 #include "libavutil/imgutils.h"
23 #include "libavutil/opt.h"
24 #include "libavutil/pixdesc.h"
25 
26 #include "avfilter.h"
27 #include "formats.h"
28 #include "internal.h"
29 #include "framesync.h"
30 #include "video.h"
31 
32 typedef struct StackItem {
33  int x[4], y[4];
34  int linesize[4];
35  int height[4];
36 } StackItem;
37 
38 typedef struct StackContext {
39  const AVClass *class;
41  int nb_inputs;
42  char *layout;
43  int shortest;
46  int nb_planes;
47 
51 } StackContext;
52 
54 {
56  int fmt, ret;
57 
58  for (fmt = 0; av_pix_fmt_desc_get(fmt); fmt++) {
60  if (!(desc->flags & AV_PIX_FMT_FLAG_PAL ||
63  (ret = ff_add_format(&pix_fmts, fmt)) < 0)
64  return ret;
65  }
66 
67  return ff_set_common_formats(ctx, pix_fmts);
68 }
69 
71 {
72  StackContext *s = ctx->priv;
73  int i, ret;
74 
75  if (!strcmp(ctx->filter->name, "vstack"))
76  s->is_vertical = 1;
77 
78  if (!strcmp(ctx->filter->name, "hstack"))
79  s->is_horizontal = 1;
80 
81  s->frames = av_calloc(s->nb_inputs, sizeof(*s->frames));
82  if (!s->frames)
83  return AVERROR(ENOMEM);
84 
85  if (!strcmp(ctx->filter->name, "xstack")) {
86  if (!s->layout) {
87  if (s->nb_inputs == 2) {
88  s->layout = av_strdup("0_0|w0_0");
89  if (!s->layout)
90  return AVERROR(ENOMEM);
91  } else {
92  av_log(ctx, AV_LOG_ERROR, "No layout specified.\n");
93  return AVERROR(EINVAL);
94  }
95  }
96 
97  s->items = av_calloc(s->nb_inputs, sizeof(*s->items));
98  if (!s->items)
99  return AVERROR(ENOMEM);
100  }
101 
102  for (i = 0; i < s->nb_inputs; i++) {
103  AVFilterPad pad = { 0 };
104 
105  pad.type = AVMEDIA_TYPE_VIDEO;
106  pad.name = av_asprintf("input%d", i);
107  if (!pad.name)
108  return AVERROR(ENOMEM);
109 
110  if ((ret = ff_insert_inpad(ctx, i, &pad)) < 0) {
111  av_freep(&pad.name);
112  return ret;
113  }
114  }
115 
116  return 0;
117 }
118 
120 {
121  AVFilterContext *ctx = fs->parent;
122  AVFilterLink *outlink = ctx->outputs[0];
123  StackContext *s = fs->opaque;
124  AVFrame **in = s->frames;
125  AVFrame *out;
126  int i, p, ret, offset[4] = { 0 };
127 
128  for (i = 0; i < s->nb_inputs; i++) {
129  if ((ret = ff_framesync_get_frame(&s->fs, i, &in[i], 0)) < 0)
130  return ret;
131  }
132 
133  out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
134  if (!out)
135  return AVERROR(ENOMEM);
136  out->pts = av_rescale_q(s->fs.pts, s->fs.time_base, outlink->time_base);
138 
139  for (i = 0; i < s->nb_inputs; i++) {
140  AVFilterLink *inlink = ctx->inputs[i];
141  int linesize[4];
142  int height[4];
143 
144  if (s->is_horizontal || s->is_vertical) {
145  if ((ret = av_image_fill_linesizes(linesize, inlink->format, inlink->w)) < 0) {
146  av_frame_free(&out);
147  return ret;
148  }
149 
150  height[1] = height[2] = AV_CEIL_RSHIFT(inlink->h, s->desc->log2_chroma_h);
151  height[0] = height[3] = inlink->h;
152  }
153 
154  for (p = 0; p < s->nb_planes; p++) {
155  if (s->is_vertical) {
156  av_image_copy_plane(out->data[p] + offset[p] * out->linesize[p],
157  out->linesize[p],
158  in[i]->data[p],
159  in[i]->linesize[p],
160  linesize[p], height[p]);
161  offset[p] += height[p];
162  } else if (s->is_horizontal) {
163  av_image_copy_plane(out->data[p] + offset[p],
164  out->linesize[p],
165  in[i]->data[p],
166  in[i]->linesize[p],
167  linesize[p], height[p]);
168  offset[p] += linesize[p];
169  } else {
170  StackItem *item = &s->items[i];
171 
172  av_image_copy_plane(out->data[p] + out->linesize[p] * item->y[p] + item->x[p],
173  out->linesize[p],
174  in[i]->data[p],
175  in[i]->linesize[p],
176  item->linesize[p], item->height[p]);
177  }
178  }
179  }
180 
181  return ff_filter_frame(outlink, out);
182 }
183 
184 static int config_output(AVFilterLink *outlink)
185 {
186  AVFilterContext *ctx = outlink->src;
187  StackContext *s = ctx->priv;
188  AVRational frame_rate = ctx->inputs[0]->frame_rate;
189  AVRational sar = ctx->inputs[0]->sample_aspect_ratio;
190  int height = ctx->inputs[0]->h;
191  int width = ctx->inputs[0]->w;
192  FFFrameSyncIn *in;
193  int i, ret;
194 
195  s->desc = av_pix_fmt_desc_get(outlink->format);
196  if (!s->desc)
197  return AVERROR_BUG;
198 
199  if (s->is_vertical) {
200  for (i = 1; i < s->nb_inputs; i++) {
201  if (ctx->inputs[i]->w != width) {
202  av_log(ctx, AV_LOG_ERROR, "Input %d width %d does not match input %d width %d.\n", i, ctx->inputs[i]->w, 0, width);
203  return AVERROR(EINVAL);
204  }
205  height += ctx->inputs[i]->h;
206  }
207  } else if (s->is_horizontal) {
208  for (i = 1; i < s->nb_inputs; i++) {
209  if (ctx->inputs[i]->h != height) {
210  av_log(ctx, AV_LOG_ERROR, "Input %d height %d does not match input %d height %d.\n", i, ctx->inputs[i]->h, 0, height);
211  return AVERROR(EINVAL);
212  }
213  width += ctx->inputs[i]->w;
214  }
215  } else {
216  char *arg, *p = s->layout, *saveptr = NULL;
217  char *arg2, *p2, *saveptr2 = NULL;
218  char *arg3, *p3, *saveptr3 = NULL;
219  int inw, inh, size;
220 
221  for (i = 0; i < s->nb_inputs; i++) {
222  AVFilterLink *inlink = ctx->inputs[i];
223  StackItem *item = &s->items[i];
224 
225  if (!(arg = av_strtok(p, "|", &saveptr)))
226  return AVERROR(EINVAL);
227 
228  p = NULL;
229 
230  if ((ret = av_image_fill_linesizes(item->linesize, inlink->format, inlink->w)) < 0) {
231  return ret;
232  }
233 
234  item->height[1] = item->height[2] = AV_CEIL_RSHIFT(inlink->h, s->desc->log2_chroma_h);
235  item->height[0] = item->height[3] = inlink->h;
236 
237  p2 = arg;
238  inw = inh = 0;
239 
240  for (int j = 0; j < 2; j++) {
241  if (!(arg2 = av_strtok(p2, "_", &saveptr2)))
242  return AVERROR(EINVAL);
243 
244  p2 = NULL;
245  p3 = arg2;
246  while ((arg3 = av_strtok(p3, "+", &saveptr3))) {
247  p3 = NULL;
248  if (sscanf(arg3, "w%d", &size) == 1) {
249  if (size == i || size < 0 || size >= s->nb_inputs)
250  return AVERROR(EINVAL);
251 
252  if (!j)
253  inw += ctx->inputs[size]->w;
254  else
255  inh += ctx->inputs[size]->w;
256  } else if (sscanf(arg3, "h%d", &size) == 1) {
257  if (size == i || size < 0 || size >= s->nb_inputs)
258  return AVERROR(EINVAL);
259 
260  if (!j)
261  inw += ctx->inputs[size]->h;
262  else
263  inh += ctx->inputs[size]->h;
264  } else if (sscanf(arg3, "%d", &size) == 1) {
265  if (size < 0)
266  return AVERROR(EINVAL);
267 
268  if (!j)
269  inw += size;
270  else
271  inh += size;
272  } else {
273  return AVERROR(EINVAL);
274  }
275  }
276  }
277 
278  if ((ret = av_image_fill_linesizes(item->x, inlink->format, inw)) < 0) {
279  return ret;
280  }
281 
282  item->y[1] = item->y[2] = AV_CEIL_RSHIFT(inh, s->desc->log2_chroma_h);
283  item->y[0] = item->y[3] = inh;
284 
285  width = FFMAX(width, inlink->w + inw);
286  height = FFMAX(height, inlink->h + inh);
287  }
288  }
289 
291 
292  outlink->w = width;
293  outlink->h = height;
294  outlink->frame_rate = frame_rate;
295  outlink->sample_aspect_ratio = sar;
296 
297  if ((ret = ff_framesync_init(&s->fs, ctx, s->nb_inputs)) < 0)
298  return ret;
299 
300  in = s->fs.in;
301  s->fs.opaque = s;
303 
304  for (i = 0; i < s->nb_inputs; i++) {
305  AVFilterLink *inlink = ctx->inputs[i];
306 
307  in[i].time_base = inlink->time_base;
308  in[i].sync = 1;
309  in[i].before = EXT_STOP;
310  in[i].after = s->shortest ? EXT_STOP : EXT_INFINITY;
311  }
312 
313  ret = ff_framesync_configure(&s->fs);
314  outlink->time_base = s->fs.time_base;
315 
316  return ret;
317 }
318 
320 {
321  StackContext *s = ctx->priv;
322  int i;
323 
324  ff_framesync_uninit(&s->fs);
325  av_freep(&s->frames);
326  av_freep(&s->items);
327 
328  for (i = 0; i < ctx->nb_inputs; i++)
329  av_freep(&ctx->input_pads[i].name);
330 }
331 
333 {
334  StackContext *s = ctx->priv;
335  return ff_framesync_activate(&s->fs);
336 }
337 
338 #define OFFSET(x) offsetof(StackContext, x)
339 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_FILTERING_PARAM
340 static const AVOption stack_options[] = {
341  { "inputs", "set number of inputs", OFFSET(nb_inputs), AV_OPT_TYPE_INT, {.i64=2}, 2, INT_MAX, .flags = FLAGS },
342  { "shortest", "force termination when the shortest input terminates", OFFSET(shortest), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, .flags = FLAGS },
343  { NULL },
344 };
345 
346 static const AVFilterPad outputs[] = {
347  {
348  .name = "default",
349  .type = AVMEDIA_TYPE_VIDEO,
350  .config_props = config_output,
351  },
352  { NULL }
353 };
354 
355 #if CONFIG_HSTACK_FILTER
356 
357 #define hstack_options stack_options
358 AVFILTER_DEFINE_CLASS(hstack);
359 
361  .name = "hstack",
362  .description = NULL_IF_CONFIG_SMALL("Stack video inputs horizontally."),
363  .priv_size = sizeof(StackContext),
364  .priv_class = &hstack_class,
366  .outputs = outputs,
367  .init = init,
368  .uninit = uninit,
369  .activate = activate,
371 };
372 
373 #endif /* CONFIG_HSTACK_FILTER */
374 
375 #if CONFIG_VSTACK_FILTER
376 
377 #define vstack_options stack_options
378 AVFILTER_DEFINE_CLASS(vstack);
379 
381  .name = "vstack",
382  .description = NULL_IF_CONFIG_SMALL("Stack video inputs vertically."),
383  .priv_size = sizeof(StackContext),
384  .priv_class = &vstack_class,
386  .outputs = outputs,
387  .init = init,
388  .uninit = uninit,
389  .activate = activate,
391 };
392 
393 #endif /* CONFIG_VSTACK_FILTER */
394 
395 #if CONFIG_XSTACK_FILTER
396 
397 static const AVOption xstack_options[] = {
398  { "inputs", "set number of inputs", OFFSET(nb_inputs), AV_OPT_TYPE_INT, {.i64=2}, 2, INT_MAX, .flags = FLAGS },
399  { "layout", "set custom layout", OFFSET(layout), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, .flags = FLAGS },
400  { "shortest", "force termination when the shortest input terminates", OFFSET(shortest), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, .flags = FLAGS },
401  { NULL },
402 };
403 
404 AVFILTER_DEFINE_CLASS(xstack);
405 
407  .name = "xstack",
408  .description = NULL_IF_CONFIG_SMALL("Stack video inputs into custom layout."),
409  .priv_size = sizeof(StackContext),
410  .priv_class = &xstack_class,
412  .outputs = outputs,
413  .init = init,
414  .uninit = uninit,
415  .activate = activate,
417 };
418 
419 #endif /* CONFIG_XSTACK_FILTER */
#define AV_PIX_FMT_FLAG_PAL
Pixel format has a palette in data[1], values are indexes in this palette.
Definition: pixdesc.h:132
#define NULL
Definition: coverity.c:32
#define FLAGS
Definition: vf_stack.c:339
char * layout
Definition: vf_stack.c:42
const AVPixFmtDescriptor * av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:2522
This structure describes decoded (raw) audio or video data.
Definition: frame.h:268
AVOption.
Definition: opt.h:246
const char * fmt
Definition: avisynth_c.h:861
int shortest
Definition: vf_stack.c:43
misc image utilities
int av_pix_fmt_count_planes(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:2562
Main libavfilter public API header.
const char * desc
Definition: nvenc.c:68
#define AVFILTER_FLAG_DYNAMIC_INPUTS
The number of the filter inputs is not determined just by AVFilter.inputs.
Definition: avfilter.h:105
int is_horizontal
Definition: vf_stack.c:45
AVFilter ff_vf_hstack
enum AVMediaType type
AVFilterPad type.
Definition: internal.h:65
int ff_framesync_configure(FFFrameSync *fs)
Configure a frame sync structure.
Definition: framesync.c:117
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
int64_t pts
Timestamp of the current event.
Definition: framesync.h:167
int height[4]
Definition: vf_stack.c:35
enum FFFrameSyncExtMode before
Extrapolation mode for timestamps before the first frame.
Definition: framesync.h:86
void * av_calloc(size_t nmemb, size_t size)
Non-inlined equivalent of av_mallocz_array().
Definition: mem.c:244
const char * name
Pad name.
Definition: internal.h:60
AVFilterContext * parent
Parent filter context.
Definition: framesync.h:152
AVFilterLink ** inputs
array of pointers to input links
Definition: avfilter.h:346
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:1080
#define av_cold
Definition: attributes.h:82
static int query_formats(AVFilterContext *ctx)
Definition: vf_stack.c:53
#define fs(width, name, subs,...)
Definition: cbs_vp9.c:259
StackItem * items
Definition: vf_stack.c:48
AVOptions.
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf offset
int64_t pts
Presentation timestamp in time_base units (time when frame should be shown to user).
Definition: frame.h:361
static av_cold void uninit(AVFilterContext *ctx)
Definition: vf_stack.c:319
FFFrameSyncIn * in
Pointer to array of inputs.
Definition: framesync.h:203
enum FFFrameSyncExtMode after
Extrapolation mode for timestamps after the last frame.
Definition: framesync.h:91
ptrdiff_t size
Definition: opengl_enc.c:100
Input stream structure.
Definition: framesync.h:81
#define av_log(a,...)
A filter pad used for either input or output.
Definition: internal.h:54
int64_t av_rescale_q(int64_t a, AVRational bq, AVRational cq)
Rescale a 64-bit integer by 2 rational numbers.
Definition: mathematics.c:142
AVFilter ff_vf_xstack
AVFilterPad * input_pads
array of input pads
Definition: avfilter.h:345
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:260
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
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:568
static int config_output(AVFilterLink *outlink)
Definition: vf_stack.c:184
uint8_t log2_chroma_h
Amount to shift the luma height right to find the chroma height.
Definition: pixdesc.h:101
void ff_framesync_uninit(FFFrameSync *fs)
Free all memory currently allocated.
Definition: framesync.c:293
static const AVOption stack_options[]
Definition: vf_stack.c:340
Frame sync structure.
Definition: framesync.h:146
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
void * priv
private data for use by the filter
Definition: avfilter.h:353
const char * arg
Definition: jacosubdec.c:66
AVFilter ff_vf_vstack
#define AV_PIX_FMT_FLAG_HWACCEL
Pixel format is an HW accelerated format.
Definition: pixdesc.h:140
AVRational time_base
Time base for the incoming frames.
Definition: framesync.h:96
int ff_add_format(AVFilterFormats **avff, int64_t fmt)
Add fmt to the list of media formats contained in *avff.
Definition: formats.c:337
int ff_framesync_activate(FFFrameSync *fs)
Examine the frames in the filter&#39;s input and try to produce output.
Definition: framesync.c:344
int(* on_event)(struct FFFrameSync *fs)
Callback called when a frame event is ready.
Definition: framesync.h:172
#define FFMAX(a, b)
Definition: common.h:94
char * av_asprintf(const char *fmt,...)
Definition: avstring.c:113
uint64_t flags
Combination of AV_PIX_FMT_FLAG_...
Definition: pixdesc.h:106
unsigned nb_inputs
number of input pads
Definition: avfilter.h:347
AVFrame ** frames
Definition: vf_stack.c:49
#define width
const AVPixFmtDescriptor * desc
Definition: vf_stack.c:40
#define OFFSET(x)
Definition: vf_stack.c:338
AVFormatContext * ctx
Definition: movenc.c:48
AVRational time_base
Time base for the output events.
Definition: framesync.h:162
#define s(width, name)
Definition: cbs_vp9.c:257
void * opaque
Opaque pointer, not used by the API.
Definition: framesync.h:177
int nb_planes
Definition: vf_stack.c:46
FFFrameSync fs
Definition: vf_stack.c:50
char * av_strdup(const char *s)
Duplicate a string.
Definition: mem.c:251
Extend the frame to infinity.
Definition: framesync.h:75
static av_cold int init(AVFilterContext *ctx)
Definition: vf_stack.c:70
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:299
int ff_framesync_init(FFFrameSync *fs, AVFilterContext *parent, unsigned nb_in)
Initialize a frame sync structure.
Definition: framesync.c:77
Descriptor that unambiguously describes how the bits of a pixel are stored in the up to 4 data planes...
Definition: pixdesc.h:81
int nb_inputs
Definition: vf_stack.c:41
AVRational sample_aspect_ratio
Sample aspect ratio for the video frame, 0/1 if unknown/unspecified.
Definition: frame.h:356
#define AVERROR_BUG
Internal bug, also see AVERROR_BUG2.
Definition: error.h:50
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
unsigned sync
Synchronization level: frames on input at the highest sync level will generate output frame events...
Definition: framesync.h:139
Describe the class of an AVClass context structure.
Definition: log.h:67
Filter definition.
Definition: avfilter.h:144
int av_image_fill_linesizes(int linesizes[4], enum AVPixelFormat pix_fmt, int width)
Fill plane linesizes for an image with pixel format pix_fmt and width width.
Definition: imgutils.c:89
Rational number (pair of numerator and denominator).
Definition: rational.h:58
const char * name
Filter name.
Definition: avfilter.h:148
#define AV_PIX_FMT_FLAG_BITSTREAM
All values of a component are bit-wise packed end to end.
Definition: pixdesc.h:136
AVFilterLink ** outputs
array of pointers to output links
Definition: avfilter.h:350
static enum AVPixelFormat pix_fmts[]
Definition: libkvazaar.c:275
#define flags(name, subs,...)
Definition: cbs_av1.c:561
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:282
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
char * av_strtok(char *s, const char *delim, char **saveptr)
Split the string into several tokens which can be accessed by successive calls to av_strtok()...
Definition: avstring.c:184
static int process_frame(FFFrameSync *fs)
Definition: vf_stack.c:119
static const AVFilterPad outputs[]
Definition: vf_stack.c:346
Completely stop all streams with this one.
Definition: framesync.h:65
#define AVFILTER_DEFINE_CLASS(fname)
Definition: internal.h:334
int is_vertical
Definition: vf_stack.c:44
int linesize[4]
Definition: vf_stack.c:34
A list of supported formats for one end of a filter link.
Definition: formats.h:64
An instance of a filter.
Definition: avfilter.h:338
FILE * out
Definition: movenc.c:54
#define av_freep(p)
static int activate(AVFilterContext *ctx)
Definition: vf_stack.c:332
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.
Definition: imgutils.c:338
int x[4]
Definition: vf_stack.c:33
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 ff_framesync_get_frame(FFFrameSync *fs, unsigned in, AVFrame **rframe, unsigned get)
Get the current frame in an input.
Definition: framesync.c:256
int y[4]
Definition: vf_stack.c:33
const AVFilter * filter
the AVFilter of which this is an instance
Definition: avfilter.h:341
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 layout
#define AV_CEIL_RSHIFT(a, b)
Definition: common.h:58
static int ff_insert_inpad(AVFilterContext *f, unsigned index, AVFilterPad *p)
Insert a new input pad for the filter.
Definition: internal.h:277