FFmpeg
f_reverse.c
Go to the documentation of this file.
1 /*
2  * Copyright (c) 2015 Derek Buitenhuis
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/opt.h"
22 #include "avfilter.h"
23 #include "formats.h"
24 #include "internal.h"
25 #include "video.h"
26 
27 #define DEFAULT_LENGTH 300
28 
29 typedef struct ReverseContext {
30  int nb_frames;
32  unsigned int frames_size;
33  unsigned int pts_size;
34  int64_t *pts;
35  int flush_idx;
37 
39 {
40  ReverseContext *s = ctx->priv;
41 
42  s->pts = av_fast_realloc(NULL, &s->pts_size,
43  DEFAULT_LENGTH * sizeof(*(s->pts)));
44  if (!s->pts)
45  return AVERROR(ENOMEM);
46 
48  DEFAULT_LENGTH * sizeof(*(s->frames)));
49  if (!s->frames) {
50  av_freep(&s->pts);
51  return AVERROR(ENOMEM);
52  }
53 
54  return 0;
55 }
56 
58 {
59  ReverseContext *s = ctx->priv;
60 
61  while (s->nb_frames > 0) {
62  av_frame_free(&s->frames[s->nb_frames - 1]);
63  s->nb_frames--;
64  }
65 
66  av_freep(&s->pts);
67  av_freep(&s->frames);
68 }
69 
71 {
72  AVFilterContext *ctx = inlink->dst;
73  ReverseContext *s = ctx->priv;
74  void *ptr;
75 
76  if (s->nb_frames + 1 > s->pts_size / sizeof(*(s->pts))) {
77  ptr = av_fast_realloc(s->pts, &s->pts_size, s->pts_size * 2);
78  if (!ptr)
79  return AVERROR(ENOMEM);
80  s->pts = ptr;
81  }
82 
83  if (s->nb_frames + 1 > s->frames_size / sizeof(*(s->frames))) {
84  ptr = av_fast_realloc(s->frames, &s->frames_size, s->frames_size * 2);
85  if (!ptr)
86  return AVERROR(ENOMEM);
87  s->frames = ptr;
88  }
89 
90  s->frames[s->nb_frames] = in;
91  s->pts[s->nb_frames] = in->pts;
92  s->nb_frames++;
93 
94  return 0;
95 }
96 
97 #if CONFIG_REVERSE_FILTER
98 
99 static int request_frame(AVFilterLink *outlink)
100 {
101  AVFilterContext *ctx = outlink->src;
102  ReverseContext *s = ctx->priv;
103  int ret;
104 
105  ret = ff_request_frame(ctx->inputs[0]);
106 
107  if (ret == AVERROR_EOF && s->nb_frames > 0) {
108  AVFrame *out = s->frames[s->nb_frames - 1];
109  out->pts = s->pts[s->flush_idx++];
110  ret = ff_filter_frame(outlink, out);
111  s->frames[s->nb_frames - 1] = NULL;
112  s->nb_frames--;
113  }
114 
115  return ret;
116 }
117 
118 static const AVFilterPad reverse_inputs[] = {
119  {
120  .name = "default",
121  .type = AVMEDIA_TYPE_VIDEO,
122  .filter_frame = filter_frame,
123  },
124  { NULL }
125 };
126 
127 static const AVFilterPad reverse_outputs[] = {
128  {
129  .name = "default",
130  .type = AVMEDIA_TYPE_VIDEO,
131  .request_frame = request_frame,
132  },
133  { NULL }
134 };
135 
137  .name = "reverse",
138  .description = NULL_IF_CONFIG_SMALL("Reverse a clip."),
139  .priv_size = sizeof(ReverseContext),
140  .init = init,
141  .uninit = uninit,
142  .inputs = reverse_inputs,
143  .outputs = reverse_outputs,
144 };
145 
146 #endif /* CONFIG_REVERSE_FILTER */
147 
148 #if CONFIG_AREVERSE_FILTER
149 
150 static int query_formats(AVFilterContext *ctx)
151 {
154  int ret;
155 
156  layouts = ff_all_channel_counts();
157  if (!layouts)
158  return AVERROR(ENOMEM);
159  ret = ff_set_common_channel_layouts(ctx, layouts);
160  if (ret < 0)
161  return ret;
162 
164  if (ret < 0)
165  return ret;
166 
167  formats = ff_all_samplerates();
168  if (!formats)
169  return AVERROR(ENOMEM);
170  return ff_set_common_samplerates(ctx, formats);
171 }
172 
173 static void reverse_samples_planar(AVFrame *out)
174 {
175  for (int p = 0; p < out->channels; p++) {
176  switch (out->format) {
177  case AV_SAMPLE_FMT_U8P: {
178  uint8_t *dst = (uint8_t *)out->extended_data[p];
179  for (int i = 0, j = out->nb_samples - 1; i < j; i++, j--)
180  FFSWAP(uint8_t, dst[i], dst[j]);
181  }
182  break;
183  case AV_SAMPLE_FMT_S16P: {
184  int16_t *dst = (int16_t *)out->extended_data[p];
185  for (int i = 0, j = out->nb_samples - 1; i < j; i++, j--)
186  FFSWAP(int16_t, dst[i], dst[j]);
187  }
188  break;
189  case AV_SAMPLE_FMT_S32P: {
190  int32_t *dst = (int32_t *)out->extended_data[p];
191  for (int i = 0, j = out->nb_samples - 1; i < j; i++, j--)
192  FFSWAP(int32_t, dst[i], dst[j]);
193  }
194  break;
195  case AV_SAMPLE_FMT_FLTP: {
196  float *dst = (float *)out->extended_data[p];
197  for (int i = 0, j = out->nb_samples - 1; i < j; i++, j--)
198  FFSWAP(float, dst[i], dst[j]);
199  }
200  break;
201  case AV_SAMPLE_FMT_DBLP: {
202  double *dst = (double *)out->extended_data[p];
203  for (int i = 0, j = out->nb_samples - 1; i < j; i++, j--)
204  FFSWAP(double, dst[i], dst[j]);
205  }
206  break;
207  }
208  }
209 }
210 
211 static void reverse_samples_packed(AVFrame *out)
212 {
213  const int channels = out->channels;
214 
215  switch (out->format) {
216  case AV_SAMPLE_FMT_U8: {
217  uint8_t *dst = (uint8_t *)out->extended_data[0];
218  for (int i = 0, j = out->nb_samples - 1; i < j; i++, j--)
219  for (int p = 0; p < channels; p++)
220  FFSWAP(uint8_t, dst[i * channels + p], dst[j * channels + p]);
221  }
222  break;
223  case AV_SAMPLE_FMT_S16: {
224  int16_t *dst = (int16_t *)out->extended_data[0];
225  for (int i = 0, j = out->nb_samples - 1; i < j; i++, j--)
226  for (int p = 0; p < channels; p++)
227  FFSWAP(int16_t, dst[i * channels + p], dst[j * channels + p]);
228  }
229  break;
230  case AV_SAMPLE_FMT_S32: {
231  int32_t *dst = (int32_t *)out->extended_data[0];
232  for (int i = 0, j = out->nb_samples - 1; i < j; i++, j--)
233  for (int p = 0; p < channels; p++)
234  FFSWAP(int32_t, dst[i * channels + p], dst[j * channels + p]);
235  }
236  break;
237  case AV_SAMPLE_FMT_FLT: {
238  float *dst = (float *)out->extended_data[0];
239  for (int i = 0, j = out->nb_samples - 1; i < j; i++, j--)
240  for (int p = 0; p < channels; p++)
241  FFSWAP(float, dst[i * channels + p], dst[j * channels + p]);
242  }
243  break;
244  case AV_SAMPLE_FMT_DBL: {
245  double *dst = (double *)out->extended_data[0];
246  for (int i = 0, j = out->nb_samples - 1; i < j; i++, j--)
247  for (int p = 0; p < channels; p++)
248  FFSWAP(double, dst[i * channels + p], dst[j * channels + p]);
249  }
250  break;
251  }
252 }
253 
254 static int areverse_request_frame(AVFilterLink *outlink)
255 {
256  AVFilterContext *ctx = outlink->src;
257  ReverseContext *s = ctx->priv;
258  int ret;
259 
260  ret = ff_request_frame(ctx->inputs[0]);
261 
262  if (ret == AVERROR_EOF && s->nb_frames > 0) {
263  AVFrame *out = s->frames[s->nb_frames - 1];
264  out->pts = s->pts[s->flush_idx++];
265 
267  reverse_samples_planar(out);
268  else
269  reverse_samples_packed(out);
270  ret = ff_filter_frame(outlink, out);
271  s->frames[s->nb_frames - 1] = NULL;
272  s->nb_frames--;
273  }
274 
275  return ret;
276 }
277 
278 static const AVFilterPad areverse_inputs[] = {
279  {
280  .name = "default",
281  .type = AVMEDIA_TYPE_AUDIO,
282  .filter_frame = filter_frame,
283  .needs_writable = 1,
284  },
285  { NULL }
286 };
287 
288 static const AVFilterPad areverse_outputs[] = {
289  {
290  .name = "default",
291  .type = AVMEDIA_TYPE_AUDIO,
292  .request_frame = areverse_request_frame,
293  },
294  { NULL }
295 };
296 
298  .name = "areverse",
299  .description = NULL_IF_CONFIG_SMALL("Reverse an audio clip."),
300  .query_formats = query_formats,
301  .priv_size = sizeof(ReverseContext),
302  .init = init,
303  .uninit = uninit,
304  .inputs = areverse_inputs,
305  .outputs = areverse_outputs,
306 };
307 
308 #endif /* CONFIG_AREVERSE_FILTER */
float, planar
Definition: samplefmt.h:69
#define NULL
Definition: coverity.c:32
int ff_set_common_channel_layouts(AVFilterContext *ctx, AVFilterChannelLayouts *layouts)
A helper for query_formats() which sets all links to the same list of channel layouts/sample rates...
Definition: formats.c:550
This structure describes decoded (raw) audio or video data.
Definition: frame.h:295
AVFilter ff_af_areverse
Main libavfilter public API header.
channels
Definition: aptx.c:30
double, planar
Definition: samplefmt.h:70
static av_cold void uninit(AVFilterContext *ctx)
Definition: f_reverse.c:57
unsigned int pts_size
Definition: f_reverse.c:33
const char * name
Pad name.
Definition: internal.h:60
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:1093
uint8_t
#define av_cold
Definition: attributes.h:82
AV_SAMPLE_FMT_U8
AVOptions.
int64_t pts
Presentation timestamp in time_base units (time when frame should be shown to user).
Definition: frame.h:388
#define AVERROR_EOF
End of file.
Definition: error.h:55
signed 32 bits
Definition: samplefmt.h:62
AVFilterFormats * ff_all_formats(enum AVMediaType type)
Return a list of all formats supported by FFmpeg for the given media type.
Definition: formats.c:349
int av_sample_fmt_is_planar(enum AVSampleFormat sample_fmt)
Check if the sample format is planar.
Definition: samplefmt.c:112
A filter pad used for either input or output.
Definition: internal.h:54
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:259
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
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
AVFrame ** frames
Definition: f_reverse.c:31
void * priv
private data for use by the filter
Definition: avfilter.h:353
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
Definition: f_reverse.c:70
int channels
number of audio channels, only used for audio.
Definition: frame.h:601
static int request_frame(AVFilterLink *outlink)
Definition: aeval.c:274
signed 32 bits, planar
Definition: samplefmt.h:68
int32_t
AVFormatContext * ctx
Definition: movenc.c:48
#define s(width, name)
Definition: cbs_vp9.c:257
void * av_fast_realloc(void *ptr, unsigned int *size, size_t min_size)
Reallocate the given buffer if it is not large enough, otherwise do nothing.
Definition: mem.c:476
unsigned 8 bits, planar
Definition: samplefmt.h:66
static const AVFilterPad outputs[]
Definition: af_acontrast.c:203
A list of supported channel layouts.
Definition: formats.h:85
static av_cold int init(AVFilterContext *ctx)
Definition: f_reverse.c:38
int format
format of the frame, -1 if unknown or unset Values correspond to enum AVPixelFormat for video frames...
Definition: frame.h:368
#define DEFAULT_LENGTH
Definition: f_reverse.c:27
int64_t * pts
Definition: f_reverse.c:34
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
Filter definition.
Definition: avfilter.h:144
const char * name
Filter name.
Definition: avfilter.h:148
enum MovChannelLayoutTag * layouts
Definition: mov_chan.c:434
AVFilterFormats * ff_all_samplerates(void)
Definition: formats.c:394
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
unsigned int frames_size
Definition: f_reverse.c:32
static int query_formats(AVFilterContext *ctx)
Definition: aeval.c:244
signed 16 bits
Definition: samplefmt.h:61
AVFilter ff_vf_reverse
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)
signed 16 bits, planar
Definition: samplefmt.h:67
int ff_request_frame(AVFilterLink *link)
Request an input frame from the filter at the other end of the link.
Definition: avfilter.c:407
formats
Definition: signature.h:48
#define FFSWAP(type, a, b)
Definition: common.h:99
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
AVFilterChannelLayouts * ff_all_channel_counts(void)
Construct an AVFilterChannelLayouts coding for any channel layout, with known or unknown disposition...
Definition: formats.c:409
uint8_t ** extended_data
pointers to the data planes/channels.
Definition: frame.h:342
int nb_samples
number of audio samples (per channel) described by this frame
Definition: frame.h:361
for(j=16;j >0;--j)
int ff_set_common_samplerates(AVFilterContext *ctx, AVFilterFormats *samplerates)
Definition: formats.c:557