FFmpeg
avf_showspatial.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 <float.h>
22 #include <math.h>
23 
24 #include "libavutil/tx.h"
25 #include "libavutil/audio_fifo.h"
26 #include "libavutil/avassert.h"
28 #include "libavutil/opt.h"
29 #include "libavutil/parseutils.h"
30 #include "audio.h"
31 #include "formats.h"
32 #include "video.h"
33 #include "avfilter.h"
34 #include "filters.h"
35 #include "internal.h"
36 #include "window_func.h"
37 
38 typedef struct ShowSpatialContext {
39  const AVClass *class;
40  int w, h;
42  AVTXContext *fft[2]; ///< Fast Fourier Transform context
43  AVComplexFloat *fft_data[2]; ///< bins holder for each (displayed) channels
44  AVComplexFloat *fft_tdata[2]; ///< bins holder for each (displayed) channels
45  float *window_func_lut; ///< Window function LUT
47  int win_func;
48  int win_size;
49  int buf_size;
50  int consumed;
51  int hop_size;
53  int64_t pts;
55 
56 #define OFFSET(x) offsetof(ShowSpatialContext, x)
57 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
58 
59 static const AVOption showspatial_options[] = {
60  { "size", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "512x512"}, 0, 0, FLAGS },
61  { "s", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "512x512"}, 0, 0, FLAGS },
62  { "win_size", "set window size", OFFSET(win_size), AV_OPT_TYPE_INT, {.i64 = 4096}, 1024, 65536, FLAGS },
63  WIN_FUNC_OPTION("win_func", OFFSET(win_func), FLAGS, WFUNC_HANNING),
64  { "rate", "set video rate", OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, {.str="25"}, 0, INT_MAX, FLAGS },
65  { "r", "set video rate", OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, {.str="25"}, 0, INT_MAX, FLAGS },
66  { NULL }
67 };
68 
69 AVFILTER_DEFINE_CLASS(showspatial);
70 
72 {
73  ShowSpatialContext *s = ctx->priv;
74 
75  for (int i = 0; i < 2; i++)
76  av_tx_uninit(&s->fft[i]);
77  for (int i = 0; i < 2; i++) {
78  av_freep(&s->fft_data[i]);
79  av_freep(&s->fft_tdata[i]);
80  }
81  av_freep(&s->window_func_lut);
82  av_audio_fifo_free(s->fifo);
83 }
84 
86 {
89  AVFilterLink *inlink = ctx->inputs[0];
90  AVFilterLink *outlink = ctx->outputs[0];
92  static const enum AVPixelFormat pix_fmts[] = { AV_PIX_FMT_GBRP, AV_PIX_FMT_NONE };
93  int ret;
94 
96  if ((ret = ff_formats_ref (formats, &inlink->outcfg.formats )) < 0 ||
98  (ret = ff_channel_layouts_ref (layout , &inlink->outcfg.channel_layouts)) < 0)
99  return ret;
100 
102  if ((ret = ff_formats_ref(formats, &inlink->outcfg.samplerates)) < 0)
103  return ret;
104 
106  if ((ret = ff_formats_ref(formats, &outlink->incfg.formats)) < 0)
107  return ret;
108 
109  return 0;
110 }
111 
112 static int run_channel_fft(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
113 {
114  ShowSpatialContext *s = ctx->priv;
115  const float *window_func_lut = s->window_func_lut;
116  AVFrame *fin = arg;
117  const int ch = jobnr;
118  const float *p = (float *)fin->extended_data[ch];
119 
120  for (int n = 0; n < fin->nb_samples; n++) {
121  s->fft_tdata[ch][n].re = p[n] * window_func_lut[n];
122  s->fft_tdata[ch][n].im = 0.f;
123  }
124 
125  s->tx_fn[ch](s->fft[ch], s->fft_data[ch], s->fft_tdata[ch], sizeof(AVComplexFloat));
126 
127  return 0;
128 }
129 
130 static int config_output(AVFilterLink *outlink)
131 {
132  AVFilterContext *ctx = outlink->src;
133  AVFilterLink *inlink = ctx->inputs[0];
134  ShowSpatialContext *s = ctx->priv;
135  float overlap;
136  int ret;
137 
138  outlink->w = s->w;
139  outlink->h = s->h;
140  outlink->sample_aspect_ratio = (AVRational){1,1};
141 
142  outlink->frame_rate = s->frame_rate;
143  outlink->time_base = av_inv_q(outlink->frame_rate);
144 
145  /* (re-)configuration if the video output changed (or first init) */
146  if (s->win_size != s->buf_size) {
147  s->buf_size = s->win_size;
148 
149  /* FFT buffers: x2 for each channel buffer.
150  * Note: we use free and malloc instead of a realloc-like function to
151  * make sure the buffer is aligned in memory for the FFT functions. */
152  for (int i = 0; i < 2; i++) {
153  av_tx_uninit(&s->fft[i]);
154  av_freep(&s->fft_data[i]);
155  av_freep(&s->fft_tdata[i]);
156  }
157  for (int i = 0; i < 2; i++) {
158  float scale = 1.f;
159  ret = av_tx_init(&s->fft[i], &s->tx_fn[i], AV_TX_FLOAT_FFT,
160  0, s->win_size, &scale, 0);
161  if (ret < 0)
162  return ret;
163  }
164 
165  for (int i = 0; i < 2; i++) {
166  s->fft_tdata[i] = av_calloc(s->buf_size, sizeof(**s->fft_tdata));
167  if (!s->fft_tdata[i])
168  return AVERROR(ENOMEM);
169 
170  s->fft_data[i] = av_calloc(s->buf_size, sizeof(**s->fft_data));
171  if (!s->fft_data[i])
172  return AVERROR(ENOMEM);
173  }
174 
175  /* pre-calc windowing function */
176  s->window_func_lut =
177  av_realloc_f(s->window_func_lut, s->win_size,
178  sizeof(*s->window_func_lut));
179  if (!s->window_func_lut)
180  return AVERROR(ENOMEM);
181  generate_window_func(s->window_func_lut, s->win_size, s->win_func, &overlap);
182 
183  s->hop_size = FFMAX(1, av_rescale(inlink->sample_rate, s->frame_rate.den, s->frame_rate.num));
184  }
185 
186  av_audio_fifo_free(s->fifo);
187  s->fifo = av_audio_fifo_alloc(inlink->format, inlink->ch_layout.nb_channels, s->win_size);
188  if (!s->fifo)
189  return AVERROR(ENOMEM);
190  return 0;
191 }
192 
193 #define RE(y, ch) s->fft_data[ch][y].re
194 #define IM(y, ch) s->fft_data[ch][y].im
195 
196 static void draw_dot(uint8_t *dst, int linesize, int value)
197 {
198  dst[0] = value;
199  dst[1] = value;
200  dst[-1] = value;
201  dst[linesize] = value;
202  dst[-linesize] = value;
203 }
204 
205 static int draw_spatial(AVFilterLink *inlink, AVFrame *insamples)
206 {
207  AVFilterContext *ctx = inlink->dst;
208  AVFilterLink *outlink = ctx->outputs[0];
209  ShowSpatialContext *s = ctx->priv;
210  AVFrame *outpicref;
211  int h = s->h - 2;
212  int w = s->w - 2;
213  int z = s->win_size / 2;
214  int64_t pts = av_rescale_q(insamples->pts, inlink->time_base, outlink->time_base);
215 
216  outpicref = ff_get_video_buffer(outlink, outlink->w, outlink->h);
217  if (!outpicref)
218  return AVERROR(ENOMEM);
219 
220  outpicref->sample_aspect_ratio = (AVRational){1,1};
221  for (int i = 0; i < outlink->h; i++) {
222  memset(outpicref->data[0] + i * outpicref->linesize[0], 0, outlink->w);
223  memset(outpicref->data[1] + i * outpicref->linesize[1], 0, outlink->w);
224  memset(outpicref->data[2] + i * outpicref->linesize[2], 0, outlink->w);
225  }
226 
227  for (int j = 0; j < z; j++) {
228  const int idx = z - 1 - j;
229  float l = hypotf(RE(idx, 0), IM(idx, 0));
230  float r = hypotf(RE(idx, 1), IM(idx, 1));
231  float sum = l + r;
232  float lp = atan2f(IM(idx, 0), RE(idx, 0));
233  float rp = atan2f(IM(idx, 1), RE(idx, 1));
234  float diffp = ((rp - lp) / (2.f * M_PI) + 1.f) * 0.5f;
235  float diff = (sum < 0.000001f ? 0.f : (r - l) / sum) * 0.5f + 0.5f;
236  float cr = av_clipf(cbrtf(l / sum), 0, 1) * 255.f;
237  float cb = av_clipf(cbrtf(r / sum), 0, 1) * 255.f;
238  float cg;
239  int x, y;
240 
241  cg = diffp * 255.f;
242  x = av_clip(w * diff, 0, w - 2) + 1;
243  y = av_clip(h * diffp, 0, h - 2) + 1;
244 
245  draw_dot(outpicref->data[0] + outpicref->linesize[0] * y + x, outpicref->linesize[0], cg);
246  draw_dot(outpicref->data[1] + outpicref->linesize[1] * y + x, outpicref->linesize[1], cb);
247  draw_dot(outpicref->data[2] + outpicref->linesize[2] * y + x, outpicref->linesize[2], cr);
248  }
249 
250  outpicref->pts = pts;
251  outpicref->duration = 1;
252 
253  return ff_filter_frame(outlink, outpicref);
254 }
255 
257 {
258  AVFilterLink *inlink = ctx->inputs[0];
259  AVFilterLink *outlink = ctx->outputs[0];
260  ShowSpatialContext *s = ctx->priv;
261  int ret;
262 
264 
265  if (av_audio_fifo_size(s->fifo) < s->win_size) {
266  AVFrame *frame = NULL;
267 
269  if (ret < 0)
270  return ret;
271  if (ret > 0) {
272  s->pts = frame->pts;
273  s->consumed = 0;
274 
277  }
278  }
279 
280  if (av_audio_fifo_size(s->fifo) >= s->win_size) {
281  AVFrame *fin = ff_get_audio_buffer(inlink, s->win_size);
282  if (!fin)
283  return AVERROR(ENOMEM);
284 
285  fin->pts = s->pts + s->consumed;
286  s->consumed += s->hop_size;
287  ret = av_audio_fifo_peek(s->fifo, (void **)fin->extended_data,
288  FFMIN(s->win_size, av_audio_fifo_size(s->fifo)));
289  if (ret < 0) {
290  av_frame_free(&fin);
291  return ret;
292  }
293 
294  av_assert0(fin->nb_samples == s->win_size);
295 
297 
298  ret = draw_spatial(inlink, fin);
299 
300  av_frame_free(&fin);
301  av_audio_fifo_drain(s->fifo, s->hop_size);
302  if (ret <= 0)
303  return ret;
304  }
305 
307  if (ff_outlink_frame_wanted(outlink) && av_audio_fifo_size(s->fifo) < s->win_size) {
309  return 0;
310  }
311 
312  if (av_audio_fifo_size(s->fifo) >= s->win_size) {
314  return 0;
315  }
316  return FFERROR_NOT_READY;
317 }
318 
320  {
321  .name = "default",
322  .type = AVMEDIA_TYPE_VIDEO,
323  .config_props = config_output,
324  },
325 };
326 
328  .name = "showspatial",
329  .description = NULL_IF_CONFIG_SMALL("Convert input audio to a spatial video output."),
330  .uninit = uninit,
331  .priv_size = sizeof(ShowSpatialContext),
335  .activate = spatial_activate,
336  .priv_class = &showspatial_class,
338 };
av_audio_fifo_free
void av_audio_fifo_free(AVAudioFifo *af)
Free an AVAudioFifo.
Definition: audio_fifo.c:48
formats
formats
Definition: signature.h:48
ff_get_video_buffer
AVFrame * ff_get_video_buffer(AVFilterLink *link, int w, int h)
Request a picture buffer with a specific set of permissions.
Definition: video.c:112
ff_get_audio_buffer
AVFrame * ff_get_audio_buffer(AVFilterLink *link, int nb_samples)
Request an audio samples buffer with a specific set of permissions.
Definition: audio.c:109
AV_SAMPLE_FMT_FLTP
@ AV_SAMPLE_FMT_FLTP
float, planar
Definition: samplefmt.h:66
AVFilterChannelLayouts
A list of supported channel layouts.
Definition: formats.h:85
AVPixelFormat
AVPixelFormat
Pixel format.
Definition: pixfmt.h:71
showspatial_outputs
static const AVFilterPad showspatial_outputs[]
Definition: avf_showspatial.c:319
ShowSpatialContext::hop_size
int hop_size
Definition: avf_showspatial.c:51
av_clip
#define av_clip
Definition: common.h:98
r
const char * r
Definition: vf_curves.c:126
AVERROR
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
opt.h
ff_make_format_list
AVFilterFormats * ff_make_format_list(const int *fmts)
Create a list of supported formats.
Definition: formats.c:435
AV_CHANNEL_LAYOUT_STEREO
#define AV_CHANNEL_LAYOUT_STEREO
Definition: channel_layout.h:389
cb
static double cb(void *priv, double x, double y)
Definition: vf_geq.c:241
ff_filter_frame
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:1007
sample_fmts
static enum AVSampleFormat sample_fmts[]
Definition: adpcmenc.c:947
AVFrame::duration
int64_t duration
Duration of the frame, in the same units as pts.
Definition: frame.h:807
ff_channel_layouts_ref
int ff_channel_layouts_ref(AVFilterChannelLayouts *f, AVFilterChannelLayouts **ref)
Add *ref as a new reference to f.
Definition: formats.c:673
FFERROR_NOT_READY
return FFERROR_NOT_READY
Definition: filter_design.txt:204
AV_OPT_TYPE_VIDEO_RATE
@ AV_OPT_TYPE_VIDEO_RATE
offset must point to AVRational
Definition: opt.h:238
av_audio_fifo_write
int av_audio_fifo_write(AVAudioFifo *af, void *const *data, int nb_samples)
Write data to an AVAudioFifo.
Definition: audio_fifo.c:119
AVTXContext
Definition: tx_priv.h:235
atan2f
#define atan2f(y, x)
Definition: libm.h:45
spatial_activate
static int spatial_activate(AVFilterContext *ctx)
Definition: avf_showspatial.c:256
inlink
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
Definition: filter_design.txt:212
av_frame_free
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:100
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:340
AVFrame::pts
int64_t pts
Presentation timestamp in time_base units (time when frame should be shown to user).
Definition: frame.h:452
w
uint8_t w
Definition: llviddspenc.c:38
AVOption
AVOption.
Definition: opt.h:251
FILTER_QUERY_FUNC
#define FILTER_QUERY_FUNC(func)
Definition: internal.h:159
ShowSpatialContext::window_func_lut
float * window_func_lut
Window function LUT.
Definition: avf_showspatial.c:45
float.h
AVComplexFloat
Definition: tx.h:27
WIN_FUNC_OPTION
#define WIN_FUNC_OPTION(win_func_opt_name, win_func_offset, flag, default_window_func)
Definition: window_func.h:37
FFMAX
#define FFMAX(a, b)
Definition: macros.h:47
ShowSpatialContext::frame_rate
AVRational frame_rate
Definition: avf_showspatial.c:41
AVFilter::name
const char * name
Filter name.
Definition: avfilter.h:170
uninit
static av_cold void uninit(AVFilterContext *ctx)
Definition: avf_showspatial.c:71
video.h
FF_FILTER_FORWARD_STATUS_BACK
#define FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink)
Forward the status on an output link to an input link.
Definition: filters.h:199
av_tx_init
av_cold int av_tx_init(AVTXContext **ctx, av_tx_fn *tx, enum AVTXType type, int inv, int len, const void *scale, uint64_t flags)
Initialize a transform context with the given configuration (i)MDCTs with an odd length are currently...
Definition: tx.c:902
AVFrame::data
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:361
AVFilterFormats
A list of supported formats for one end of a filter link.
Definition: formats.h:64
formats.h
ff_inlink_consume_frame
int ff_inlink_consume_frame(AVFilterLink *link, AVFrame **rframe)
Take a frame from the link's FIFO and update the link's stats.
Definition: avfilter.c:1438
AVAudioFifo
Context for an Audio FIFO Buffer.
Definition: audio_fifo.c:37
RE
#define RE(y, ch)
Definition: avf_showspatial.c:193
av_audio_fifo_drain
int av_audio_fifo_drain(AVAudioFifo *af, int nb_samples)
Drain data from an AVAudioFifo.
Definition: audio_fifo.c:195
pts
static int64_t pts
Definition: transcode_aac.c:643
AVFilterPad
A filter pad used for either input or output.
Definition: internal.h:33
avassert.h
av_cold
#define av_cold
Definition: attributes.h:90
showspatial_options
static const AVOption showspatial_options[]
Definition: avf_showspatial.c:59
av_tx_fn
void(* av_tx_fn)(AVTXContext *s, void *out, void *in, ptrdiff_t stride)
Function pointer to a function to perform the transform.
Definition: tx.h:151
ShowSpatialContext::consumed
int consumed
Definition: avf_showspatial.c:50
ff_inlink_request_frame
void ff_inlink_request_frame(AVFilterLink *link)
Mark that a frame is wanted on the link.
Definition: avfilter.c:1564
s
#define s(width, name)
Definition: cbs_vp9.c:198
ff_formats_ref
int ff_formats_ref(AVFilterFormats *f, AVFilterFormats **ref)
Add *ref as a new reference to formats.
Definition: formats.c:678
av_assert0
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:40
filters.h
pix_fmts
static enum AVPixelFormat pix_fmts[]
Definition: libkvazaar.c:304
AV_TX_FLOAT_FFT
@ AV_TX_FLOAT_FFT
Standard complex to complex FFT with sample data type of AVComplexFloat, AVComplexDouble or AVComplex...
Definition: tx.h:47
ctx
AVFormatContext * ctx
Definition: movenc.c:48
av_rescale_q
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
FLAGS
#define FLAGS
Definition: avf_showspatial.c:57
FILTER_INPUTS
#define FILTER_INPUTS(array)
Definition: internal.h:182
OFFSET
#define OFFSET(x)
Definition: avf_showspatial.c:56
ShowSpatialContext
Definition: avf_showspatial.c:38
frame
static AVFrame * frame
Definition: demux_decode.c:54
arg
const char * arg
Definition: jacosubdec.c:67
av_realloc_f
#define av_realloc_f(p, o, n)
Definition: tableprint_vlc.h:32
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:66
NULL
#define NULL
Definition: coverity.c:32
AVRational
Rational number (pair of numerator and denominator).
Definition: rational.h:58
av_audio_fifo_alloc
AVAudioFifo * av_audio_fifo_alloc(enum AVSampleFormat sample_fmt, int channels, int nb_samples)
Allocate an AVAudioFifo.
Definition: audio_fifo.c:62
AV_OPT_TYPE_IMAGE_SIZE
@ AV_OPT_TYPE_IMAGE_SIZE
offset must point to two consecutive integers
Definition: opt.h:235
parseutils.h
ff_audio_default_filterpad
const AVFilterPad ff_audio_default_filterpad[1]
An AVFilterPad array whose only entry has name "default" and is of type AVMEDIA_TYPE_AUDIO.
Definition: audio.c:33
generate_window_func
static void generate_window_func(float *lut, int N, int win_func, float *overlap)
Definition: window_func.h:63
WFUNC_HANNING
@ WFUNC_HANNING
Definition: window_func.h:29
av_clipf
av_clipf
Definition: af_crystalizer.c:121
ShowSpatialContext::fft_tdata
AVComplexFloat * fft_tdata[2]
bins holder for each (displayed) channels
Definition: avf_showspatial.c:44
ff_add_channel_layout
int ff_add_channel_layout(AVFilterChannelLayouts **l, const AVChannelLayout *channel_layout)
Definition: formats.c:521
AVFILTER_DEFINE_CLASS
AVFILTER_DEFINE_CLASS(showspatial)
query_formats
static int query_formats(AVFilterContext *ctx)
Definition: avf_showspatial.c:85
f
f
Definition: af_crystalizer.c:121
scale
static void scale(int *out, const int *in, const int w, const int h, const int shift)
Definition: vvc_intra.c:292
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:106
AVChannelLayout
An AVChannelLayout holds information about the channel layout of audio data.
Definition: channel_layout.h:313
ShowSpatialContext::buf_size
int buf_size
Definition: avf_showspatial.c:49
for
for(k=2;k<=8;++k)
Definition: h264pred_template.c:425
AV_SAMPLE_FMT_NONE
@ AV_SAMPLE_FMT_NONE
Definition: samplefmt.h:56
ShowSpatialContext::fifo
AVAudioFifo * fifo
Definition: avf_showspatial.c:52
ShowSpatialContext::h
int h
Definition: avf_showspatial.c:40
diff
static av_always_inline int diff(const struct color_info *a, const struct color_info *b, const int trans_thresh)
Definition: vf_paletteuse.c:164
ShowSpatialContext::win_size
int win_size
Definition: avf_showspatial.c:48
av_audio_fifo_peek
int av_audio_fifo_peek(const AVAudioFifo *af, void *const *data, int nb_samples)
Peek data from an AVAudioFifo.
Definition: audio_fifo.c:145
run_channel_fft
static int run_channel_fft(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
Definition: avf_showspatial.c:112
av_audio_fifo_size
int av_audio_fifo_size(AVAudioFifo *af)
Get the current number of samples in the AVAudioFifo available for reading.
Definition: audio_fifo.c:222
M_PI
#define M_PI
Definition: mathematics.h:67
av_tx_uninit
av_cold void av_tx_uninit(AVTXContext **ctx)
Frees a context and sets *ctx to NULL, does nothing when *ctx == NULL.
Definition: tx.c:294
internal.h
layout
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
Definition: filter_design.txt:18
IM
#define IM(y, ch)
Definition: avf_showspatial.c:194
ShowSpatialContext::tx_fn
av_tx_fn tx_fn[2]
Definition: avf_showspatial.c:46
ShowSpatialContext::pts
int64_t pts
Definition: avf_showspatial.c:53
AVFrame::nb_samples
int nb_samples
number of audio samples (per channel) described by this frame
Definition: frame.h:420
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:245
AVFrame::extended_data
uint8_t ** extended_data
pointers to the data planes/channels.
Definition: frame.h:401
AVSampleFormat
AVSampleFormat
Audio sample formats.
Definition: samplefmt.h:55
value
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 default value
Definition: writing_filters.txt:86
FFMIN
#define FFMIN(a, b)
Definition: macros.h:49
cbrtf
static av_always_inline float cbrtf(float x)
Definition: libm.h:61
audio_fifo.h
av_inv_q
static av_always_inline AVRational av_inv_q(AVRational q)
Invert a rational.
Definition: rational.h:159
AVFilterPad::name
const char * name
Pad name.
Definition: internal.h:39
av_rescale
int64_t av_rescale(int64_t a, int64_t b, int64_t c)
Rescale a 64-bit integer with rounding to nearest.
Definition: mathematics.c:129
av_calloc
void * av_calloc(size_t nmemb, size_t size)
Definition: mem.c:262
AVFilter
Filter definition.
Definition: avfilter.h:166
ret
ret
Definition: filter_design.txt:187
AVFrame::sample_aspect_ratio
AVRational sample_aspect_ratio
Sample aspect ratio for the video frame, 0/1 if unknown/unspecified.
Definition: frame.h:447
window_func.h
ff_all_samplerates
AVFilterFormats * ff_all_samplerates(void)
Definition: formats.c:606
channel_layout.h
AV_PIX_FMT_NONE
@ AV_PIX_FMT_NONE
Definition: pixfmt.h:72
AV_OPT_TYPE_INT
@ AV_OPT_TYPE_INT
Definition: opt.h:225
avfilter.h
draw_dot
static void draw_dot(uint8_t *dst, int linesize, int value)
Definition: avf_showspatial.c:196
AVFilterContext
An instance of a filter.
Definition: avfilter.h:409
AV_PIX_FMT_GBRP
@ AV_PIX_FMT_GBRP
planar GBR 4:4:4 24bpp
Definition: pixfmt.h:165
AVFILTER_FLAG_SLICE_THREADS
#define AVFILTER_FLAG_SLICE_THREADS
The filter supports multithreading by splitting frames into multiple parts and processing them concur...
Definition: avfilter.h:117
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
audio.h
ShowSpatialContext::fft_data
AVComplexFloat * fft_data[2]
bins holder for each (displayed) channels
Definition: avf_showspatial.c:43
AVFilterFormatsConfig::formats
AVFilterFormats * formats
List of supported formats (pixel or sample).
Definition: avfilter.h:517
ff_avf_showspatial
const AVFilter ff_avf_showspatial
Definition: avf_showspatial.c:327
ShowSpatialContext::fft
AVTXContext * fft[2]
Fast Fourier Transform context.
Definition: avf_showspatial.c:42
FF_FILTER_FORWARD_STATUS
FF_FILTER_FORWARD_STATUS(inlink, outlink)
cr
static double cr(void *priv, double x, double y)
Definition: vf_geq.c:242
FILTER_OUTPUTS
#define FILTER_OUTPUTS(array)
Definition: internal.h:183
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:34
draw_spatial
static int draw_spatial(AVFilterLink *inlink, AVFrame *insamples)
Definition: avf_showspatial.c:205
ShowSpatialContext::win_func
int win_func
Definition: avf_showspatial.c:47
AVFrame::linesize
int linesize[AV_NUM_DATA_POINTERS]
For video, a positive or negative value, which is typically indicating the size in bytes of each pict...
Definition: frame.h:385
h
h
Definition: vp9dsp_template.c:2038
ff_outlink_frame_wanted
the definition of that something depends on the semantic of the filter The callback must examine the status of the filter s links and proceed accordingly The status of output links is stored in the status_in and status_out fields and tested by the ff_outlink_frame_wanted() function. If this function returns true
ff_filter_execute
static av_always_inline int ff_filter_execute(AVFilterContext *ctx, avfilter_action_func *func, void *arg, int *ret, int nb_jobs)
Definition: internal.h:134
config_output
static int config_output(AVFilterLink *outlink)
Definition: avf_showspatial.c:130
ff_filter_set_ready
void ff_filter_set_ready(AVFilterContext *filter, unsigned priority)
Mark a filter ready and schedule it for activation.
Definition: avfilter.c:223
tx.h
ShowSpatialContext::w
int w
Definition: avf_showspatial.c:40