FFmpeg
vf_hflip.c
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1 /*
2  * Copyright (c) 2007 Benoit Fouet
3  * Copyright (c) 2010 Stefano Sabatini
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 /**
23  * @file
24  * horizontal flip filter
25  */
26 
27 #include <string.h>
28 
29 #include "libavutil/opt.h"
30 #include "avfilter.h"
31 #include "formats.h"
32 #include "hflip.h"
33 #include "internal.h"
34 #include "video.h"
35 #include "libavutil/pixdesc.h"
36 #include "libavutil/internal.h"
37 #include "libavutil/intreadwrite.h"
38 #include "libavutil/imgutils.h"
39 
40 static const AVOption hflip_options[] = {
41  { NULL }
42 };
43 
45 
47 {
49  const AVPixFmtDescriptor *desc;
50  int fmt, ret;
51 
52  for (fmt = 0; desc = av_pix_fmt_desc_get(fmt); fmt++) {
53  if (!(desc->flags & AV_PIX_FMT_FLAG_HWACCEL ||
55  (desc->log2_chroma_w != desc->log2_chroma_h &&
56  desc->comp[0].plane == desc->comp[1].plane)) &&
57  (ret = ff_add_format(&pix_fmts, fmt)) < 0)
58  return ret;
59  }
60 
62 }
63 
64 static void hflip_byte_c(const uint8_t *src, uint8_t *dst, int w)
65 {
66  int j;
67 
68  for (j = 0; j < w; j++)
69  dst[j] = src[-j];
70 }
71 
72 static void hflip_short_c(const uint8_t *ssrc, uint8_t *ddst, int w)
73 {
74  const uint16_t *src = (const uint16_t *)ssrc;
75  uint16_t *dst = (uint16_t *)ddst;
76  int j;
77 
78  for (j = 0; j < w; j++)
79  dst[j] = src[-j];
80 }
81 
82 static void hflip_dword_c(const uint8_t *ssrc, uint8_t *ddst, int w)
83 {
84  const uint32_t *src = (const uint32_t *)ssrc;
85  uint32_t *dst = (uint32_t *)ddst;
86  int j;
87 
88  for (j = 0; j < w; j++)
89  dst[j] = src[-j];
90 }
91 
92 static void hflip_b24_c(const uint8_t *src, uint8_t *dst, int w)
93 {
94  const uint8_t *in = src;
95  uint8_t *out = dst;
96  int j;
97 
98  for (j = 0; j < w; j++, out += 3, in -= 3) {
99  int32_t v = AV_RB24(in);
100 
101  AV_WB24(out, v);
102  }
103 }
104 
105 static void hflip_b48_c(const uint8_t *src, uint8_t *dst, int w)
106 {
107  const uint8_t *in = src;
108  uint8_t *out = dst;
109  int j;
110 
111  for (j = 0; j < w; j++, out += 6, in -= 6) {
112  int64_t v = AV_RB48(in);
113 
114  AV_WB48(out, v);
115  }
116 }
117 
118 static void hflip_qword_c(const uint8_t *ssrc, uint8_t *ddst, int w)
119 {
120  const uint64_t *src = (const uint64_t *)ssrc;
121  uint64_t *dst = (uint64_t *)ddst;
122  int j;
123 
124  for (j = 0; j < w; j++)
125  dst[j] = src[-j];
126 }
127 
129 {
130  FlipContext *s = inlink->dst->priv;
131  const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(inlink->format);
132  const int hsub = pix_desc->log2_chroma_w;
133  const int vsub = pix_desc->log2_chroma_h;
134  int nb_planes;
135 
136  av_image_fill_max_pixsteps(s->max_step, NULL, pix_desc);
137  s->planewidth[0] = s->planewidth[3] = inlink->w;
138  s->planewidth[1] = s->planewidth[2] = AV_CEIL_RSHIFT(inlink->w, hsub);
139  s->planeheight[0] = s->planeheight[3] = inlink->h;
140  s->planeheight[1] = s->planeheight[2] = AV_CEIL_RSHIFT(inlink->h, vsub);
141  s->bayer_plus1 = !!(pix_desc->flags & AV_PIX_FMT_FLAG_BAYER) + 1;
142 
143  nb_planes = av_pix_fmt_count_planes(inlink->format);
144 
145  return ff_hflip_init(s, s->max_step, nb_planes);
146 }
147 
148 int ff_hflip_init(FlipContext *s, int step[4], int nb_planes)
149 {
150  int i;
151 
152  for (i = 0; i < nb_planes; i++) {
153  step[i] *= s->bayer_plus1;
154  switch (step[i]) {
155  case 1: s->flip_line[i] = hflip_byte_c; break;
156  case 2: s->flip_line[i] = hflip_short_c; break;
157  case 3: s->flip_line[i] = hflip_b24_c; break;
158  case 4: s->flip_line[i] = hflip_dword_c; break;
159  case 6: s->flip_line[i] = hflip_b48_c; break;
160  case 8: s->flip_line[i] = hflip_qword_c; break;
161  default:
162  return AVERROR_BUG;
163  }
164  }
165  if (ARCH_X86)
166  ff_hflip_init_x86(s, step, nb_planes);
167 
168  return 0;
169 }
170 
171 typedef struct ThreadData {
172  AVFrame *in, *out;
173 } ThreadData;
174 
175 static int filter_slice(AVFilterContext *ctx, void *arg, int job, int nb_jobs)
176 {
177  FlipContext *s = ctx->priv;
178  ThreadData *td = arg;
179  AVFrame *in = td->in;
180  AVFrame *out = td->out;
181  uint8_t *inrow, *outrow;
182  int i, plane, step;
183 
184  for (plane = 0; plane < 4 && in->data[plane] && in->linesize[plane]; plane++) {
185  const int width = s->planewidth[plane] / s->bayer_plus1;
186  const int height = s->planeheight[plane];
187  const int start = (height * job ) / nb_jobs;
188  const int end = (height * (job+1)) / nb_jobs;
189 
190  step = s->max_step[plane];
191 
192  outrow = out->data[plane] + start * out->linesize[plane];
193  inrow = in ->data[plane] + start * in->linesize[plane] + (width - 1) * step;
194  for (i = start; i < end; i++) {
195  s->flip_line[plane](inrow, outrow, width);
196 
197  inrow += in ->linesize[plane];
198  outrow += out->linesize[plane];
199  }
200  }
201 
202  return 0;
203 }
204 
206 {
207  AVFilterContext *ctx = inlink->dst;
208  AVFilterLink *outlink = ctx->outputs[0];
209  ThreadData td;
210  AVFrame *out;
211 
212  out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
213  if (!out) {
214  av_frame_free(&in);
215  return AVERROR(ENOMEM);
216  }
218 
219  /* copy palette if required */
221  memcpy(out->data[1], in->data[1], AVPALETTE_SIZE);
222 
223  td.in = in, td.out = out;
225  FFMIN(outlink->h, ff_filter_get_nb_threads(ctx)));
226 
227  av_frame_free(&in);
228  return ff_filter_frame(outlink, out);
229 }
230 
232  {
233  .name = "default",
234  .type = AVMEDIA_TYPE_VIDEO,
235  .filter_frame = filter_frame,
236  .config_props = config_props,
237  },
238 };
239 
241  {
242  .name = "default",
243  .type = AVMEDIA_TYPE_VIDEO,
244  },
245 };
246 
248  .name = "hflip",
249  .description = NULL_IF_CONFIG_SMALL("Horizontally flip the input video."),
250  .priv_size = sizeof(FlipContext),
251  .priv_class = &hflip_class,
256 };
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:98
td
#define td
Definition: regdef.h:70
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
AV_RB48
#define AV_RB48(x)
Definition: intreadwrite.h:472
out
FILE * out
Definition: movenc.c:54
ff_filter_frame
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:1018
av_pix_fmt_desc_get
const AVPixFmtDescriptor * av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:2564
hflip_options
static const AVOption hflip_options[]
Definition: vf_hflip.c:40
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:112
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:303
pixdesc.h
step
trying all byte sequences megabyte in length and selecting the best looking sequence will yield cases to try But a word about which is also called distortion Distortion can be quantified by almost any quality measurement one chooses the sum of squared differences is used but more complex methods that consider psychovisual effects can be used as well It makes no difference in this discussion First step
Definition: rate_distortion.txt:58
w
uint8_t w
Definition: llviddspenc.c:38
AVOption
AVOption.
Definition: opt.h:247
FILTER_QUERY_FUNC
#define FILTER_QUERY_FUNC(func)
Definition: internal.h:168
hflip_qword_c
static void hflip_qword_c(const uint8_t *ssrc, uint8_t *ddst, int w)
Definition: vf_hflip.c:118
AVFilter::name
const char * name
Filter name.
Definition: avfilter.h:153
ThreadData::out
AVFrame * out
Definition: af_adeclick.c:473
video.h
AVFrame::data
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:317
hsub
static void hsub(htype *dst, const htype *src, int bins)
Definition: vf_median.c:74
AVFilterFormats
A list of supported formats for one end of a filter link.
Definition: formats.h:64
formats.h
av_pix_fmt_count_planes
int av_pix_fmt_count_planes(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:2604
AV_PIX_FMT_FLAG_HWACCEL
#define AV_PIX_FMT_FLAG_HWACCEL
Pixel format is an HW accelerated format.
Definition: pixdesc.h:128
AVFilterPad
A filter pad used for either input or output.
Definition: internal.h:50
ff_set_common_formats
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:699
ff_hflip_init_x86
void ff_hflip_init_x86(FlipContext *s, int step[4], int nb_planes)
Definition: vf_hflip_init.c:31
width
#define width
intreadwrite.h
s
#define s(width, name)
Definition: cbs_vp9.c:257
AV_CEIL_RSHIFT
#define AV_CEIL_RSHIFT(a, b)
Definition: common.h:51
filter_frame
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
Definition: vf_hflip.c:205
pix_fmts
static enum AVPixelFormat pix_fmts[]
Definition: libkvazaar.c:290
ctx
AVFormatContext * ctx
Definition: movenc.c:48
AVPixFmtDescriptor::log2_chroma_w
uint8_t log2_chroma_w
Amount to shift the luma width right to find the chroma width.
Definition: pixdesc.h:80
FILTER_INPUTS
#define FILTER_INPUTS(array)
Definition: internal.h:191
arg
const char * arg
Definition: jacosubdec.c:67
NULL
#define NULL
Definition: coverity.c:32
av_frame_copy_props
int av_frame_copy_props(AVFrame *dst, const AVFrame *src)
Copy only "metadata" fields from src to dst.
Definition: frame.c:537
AVPALETTE_SIZE
#define AVPALETTE_SIZE
Definition: pixfmt.h:32
src
#define src
Definition: vp8dsp.c:255
ff_add_format
int ff_add_format(AVFilterFormats **avff, int64_t fmt)
Add fmt to the list of media formats contained in *avff.
Definition: formats.c:420
AVFILTER_DEFINE_CLASS
AVFILTER_DEFINE_CLASS(hflip)
AVPixFmtDescriptor::flags
uint64_t flags
Combination of AV_PIX_FMT_FLAG_...
Definition: pixdesc.h:94
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:117
hflip_dword_c
static void hflip_dword_c(const uint8_t *ssrc, uint8_t *ddst, int w)
Definition: vf_hflip.c:82
AV_PIX_FMT_FLAG_BITSTREAM
#define AV_PIX_FMT_FLAG_BITSTREAM
All values of a component are bit-wise packed end to end.
Definition: pixdesc.h:124
AV_WB24
#define AV_WB24(p, d)
Definition: intreadwrite.h:450
hflip.h
height
#define height
AV_PIX_FMT_FLAG_BAYER
#define AV_PIX_FMT_FLAG_BAYER
The pixel format is following a Bayer pattern.
Definition: pixdesc.h:152
ff_hflip_init
int ff_hflip_init(FlipContext *s, int step[4], int nb_planes)
Definition: vf_hflip.c:148
internal.h
AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC
#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:130
hflip_b24_c
static void hflip_b24_c(const uint8_t *src, uint8_t *dst, int w)
Definition: vf_hflip.c:92
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:271
internal.h
ff_filter_get_nb_threads
int ff_filter_get_nb_threads(AVFilterContext *ctx)
Get number of threads for current filter instance.
Definition: avfilter.c:803
ThreadData
Used for passing data between threads.
Definition: dsddec.c:67
FFMIN
#define FFMIN(a, b)
Definition: macros.h:49
AVFilterPad::name
const char * name
Pad name.
Definition: internal.h:56
AV_WB48
#define AV_WB48(p, darg)
Definition: intreadwrite.h:481
avfilter_vf_hflip_inputs
static const AVFilterPad avfilter_vf_hflip_inputs[]
Definition: vf_hflip.c:231
AVFilter
Filter definition.
Definition: avfilter.h:149
config_props
static int config_props(AVFilterLink *inlink)
Definition: vf_hflip.c:128
ret
ret
Definition: filter_design.txt:187
FlipContext
Definition: hflip.h:27
avfilter.h
av_image_fill_max_pixsteps
void av_image_fill_max_pixsteps(int max_pixsteps[4], int max_pixstep_comps[4], const AVPixFmtDescriptor *pixdesc)
Compute the max pixel step for each plane of an image with a format described by pixdesc.
Definition: imgutils.c:35
AVFilterContext
An instance of a filter.
Definition: avfilter.h:386
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:121
desc
const char * desc
Definition: libsvtav1.c:79
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
ThreadData::in
AVFrame * in
Definition: af_adecorrelate.c:154
AVPixFmtDescriptor
Descriptor that unambiguously describes how the bits of a pixel are stored in the up to 4 data planes...
Definition: pixdesc.h:69
hflip_byte_c
static void hflip_byte_c(const uint8_t *src, uint8_t *dst, int w)
Definition: vf_hflip.c:64
hflip_b48_c
static void hflip_b48_c(const uint8_t *src, uint8_t *dst, int w)
Definition: vf_hflip.c:105
FILTER_OUTPUTS
#define FILTER_OUTPUTS(array)
Definition: internal.h:192
avfilter_vf_hflip_outputs
static const AVFilterPad avfilter_vf_hflip_outputs[]
Definition: vf_hflip.c:240
filter_slice
static int filter_slice(AVFilterContext *ctx, void *arg, int job, int nb_jobs)
Definition: vf_hflip.c:175
int32_t
int32_t
Definition: audioconvert.c:56
imgutils.h
AVERROR_BUG
#define AVERROR_BUG
Internal bug, also see AVERROR_BUG2.
Definition: error.h:52
AVFrame::linesize
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:334
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:143
AV_RB24
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_WB32 unsigned int_TMPL AV_RB24
Definition: bytestream.h:97
AV_PIX_FMT_FLAG_PAL
#define AV_PIX_FMT_FLAG_PAL
Pixel format has a palette in data[1], values are indexes in this palette.
Definition: pixdesc.h:120
AVPixFmtDescriptor::log2_chroma_h
uint8_t log2_chroma_h
Amount to shift the luma height right to find the chroma height.
Definition: pixdesc.h:89
query_formats
static int query_formats(AVFilterContext *ctx)
Definition: vf_hflip.c:46
ff_vf_hflip
const AVFilter ff_vf_hflip
Definition: vf_hflip.c:247
hflip_short_c
static void hflip_short_c(const uint8_t *ssrc, uint8_t *ddst, int w)
Definition: vf_hflip.c:72