FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
vf_interlace.c
Go to the documentation of this file.
1 /*
2  * Copyright (c) 2003 Michael Zucchi <notzed@ximian.com>
3  * Copyright (c) 2010 Baptiste Coudurier
4  * Copyright (c) 2011 Stefano Sabatini
5  * Copyright (c) 2013 Vittorio Giovara <vittorio.giovara@gmail.com>
6  *
7  * This file is part of FFmpeg.
8  *
9  * FFmpeg is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License as published by
11  * the Free Software Foundation; either version 2 of the License, or
12  * (at your option) any later version.
13  *
14  * FFmpeg is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17  * GNU General Public License for more details.
18  *
19  * You should have received a copy of the GNU General Public License along
20  * with FFmpeg; if not, write to the Free Software Foundation, Inc.,
21  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
22  */
23 
24 /**
25  * @file
26  * progressive to interlaced content filter, inspired by heavy debugging of tinterlace filter
27  */
28 
29 #include "libavutil/common.h"
30 #include "libavutil/opt.h"
31 #include "libavutil/imgutils.h"
32 #include "libavutil/avassert.h"
33 
34 #include "formats.h"
35 #include "avfilter.h"
36 #include "interlace.h"
37 #include "internal.h"
38 #include "video.h"
39 
40 #define OFFSET(x) offsetof(InterlaceContext, x)
41 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
42 static const AVOption interlace_options[] = {
43  { "scan", "scanning mode", OFFSET(scan),
44  AV_OPT_TYPE_INT, {.i64 = MODE_TFF }, 0, 1, .flags = FLAGS, .unit = "scan" },
45  { "tff", "top field first", 0,
46  AV_OPT_TYPE_CONST, {.i64 = MODE_TFF }, INT_MIN, INT_MAX, .flags = FLAGS, .unit = "scan" },
47  { "bff", "bottom field first", 0,
48  AV_OPT_TYPE_CONST, {.i64 = MODE_BFF }, INT_MIN, INT_MAX, .flags = FLAGS, .unit = "scan" },
49  { "lowpass", "set vertical low-pass filter", OFFSET(lowpass),
50  AV_OPT_TYPE_BOOL, {.i64 = 1 }, 0, 1, .flags = FLAGS },
51  { NULL }
52 };
53 
54 AVFILTER_DEFINE_CLASS(interlace);
55 
56 static void lowpass_line_c(uint8_t *dstp, ptrdiff_t linesize,
57  const uint8_t *srcp,
58  const uint8_t *srcp_above,
59  const uint8_t *srcp_below)
60 {
61  int i;
62  for (i = 0; i < linesize; i++) {
63  // this calculation is an integer representation of
64  // '0.5 * current + 0.25 * above + 0.25 * below'
65  // '1 +' is for rounding.
66  dstp[i] = (1 + srcp[i] + srcp[i] + srcp_above[i] + srcp_below[i]) >> 2;
67  }
68 }
69 
70 static const enum AVPixelFormat formats_supported[] = {
75 };
76 
78 {
80  if (!fmts_list)
81  return AVERROR(ENOMEM);
82  return ff_set_common_formats(ctx, fmts_list);
83 }
84 
86 {
87  InterlaceContext *s = ctx->priv;
88 
89  av_frame_free(&s->cur);
90  av_frame_free(&s->next);
91 }
92 
93 static int config_out_props(AVFilterLink *outlink)
94 {
95  AVFilterContext *ctx = outlink->src;
96  AVFilterLink *inlink = outlink->src->inputs[0];
97  InterlaceContext *s = ctx->priv;
98 
99  if (inlink->h < 2) {
100  av_log(ctx, AV_LOG_ERROR, "input video height is too small\n");
101  return AVERROR_INVALIDDATA;
102  }
103 
104  if (!s->lowpass)
105  av_log(ctx, AV_LOG_WARNING, "Lowpass filter is disabled, "
106  "the resulting video will be aliased rather than interlaced.\n");
107 
108  // same input size
109  outlink->w = inlink->w;
110  outlink->h = inlink->h;
111  outlink->time_base = inlink->time_base;
112  outlink->frame_rate = inlink->frame_rate;
113  // half framerate
114  outlink->time_base.num *= 2;
115  outlink->frame_rate.den *= 2;
116 
117 
118  if (s->lowpass) {
120  if (ARCH_X86)
122  }
123 
124  av_log(ctx, AV_LOG_VERBOSE, "%s interlacing %s lowpass filter\n",
125  s->scan == MODE_TFF ? "tff" : "bff", (s->lowpass) ? "with" : "without");
126 
127  return 0;
128 }
129 
131  AVFrame *src_frame, AVFrame *dst_frame,
132  AVFilterLink *inlink, enum FieldType field_type,
133  int lowpass)
134 {
136  int hsub = desc->log2_chroma_w;
137  int vsub = desc->log2_chroma_h;
138  int plane, j;
139 
140  for (plane = 0; plane < desc->nb_components; plane++) {
141  int cols = (plane == 1 || plane == 2) ? -(-inlink->w) >> hsub : inlink->w;
142  int lines = (plane == 1 || plane == 2) ? AV_CEIL_RSHIFT(inlink->h, vsub) : inlink->h;
143  uint8_t *dstp = dst_frame->data[plane];
144  const uint8_t *srcp = src_frame->data[plane];
145 
146  av_assert0(cols >= 0 || lines >= 0);
147 
148  lines = (lines + (field_type == FIELD_UPPER)) / 2;
149  if (field_type == FIELD_LOWER) {
150  srcp += src_frame->linesize[plane];
151  dstp += dst_frame->linesize[plane];
152  }
153  if (lowpass) {
154  int srcp_linesize = src_frame->linesize[plane] * 2;
155  int dstp_linesize = dst_frame->linesize[plane] * 2;
156  for (j = lines; j > 0; j--) {
157  const uint8_t *srcp_above = srcp - src_frame->linesize[plane];
158  const uint8_t *srcp_below = srcp + src_frame->linesize[plane];
159  if (j == lines)
160  srcp_above = srcp; // there is no line above
161  if (j == 1)
162  srcp_below = srcp; // there is no line below
163  s->lowpass_line(dstp, cols, srcp, srcp_above, srcp_below);
164  dstp += dstp_linesize;
165  srcp += srcp_linesize;
166  }
167  } else {
168  av_image_copy_plane(dstp, dst_frame->linesize[plane] * 2,
169  srcp, src_frame->linesize[plane] * 2,
170  cols, lines);
171  }
172  }
173 }
174 
175 static int filter_frame(AVFilterLink *inlink, AVFrame *buf)
176 {
177  AVFilterContext *ctx = inlink->dst;
178  AVFilterLink *outlink = ctx->outputs[0];
179  InterlaceContext *s = ctx->priv;
180  AVFrame *out;
181  int tff, ret;
182 
183  av_frame_free(&s->cur);
184  s->cur = s->next;
185  s->next = buf;
186 
187  /* we need at least two frames */
188  if (!s->cur || !s->next)
189  return 0;
190 
191  if (s->cur->interlaced_frame) {
192  av_log(ctx, AV_LOG_WARNING,
193  "video is already interlaced, adjusting framerate only\n");
194  out = av_frame_clone(s->cur);
195  if (!out)
196  return AVERROR(ENOMEM);
197  out->pts /= 2; // adjust pts to new framerate
198  ret = ff_filter_frame(outlink, out);
199  return ret;
200  }
201 
202  tff = (s->scan == MODE_TFF);
203  out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
204  if (!out)
205  return AVERROR(ENOMEM);
206 
207  av_frame_copy_props(out, s->cur);
208  out->interlaced_frame = 1;
209  out->top_field_first = tff;
210  out->pts /= 2; // adjust pts to new framerate
211 
212  /* copy upper/lower field from cur */
213  copy_picture_field(s, s->cur, out, inlink, tff ? FIELD_UPPER : FIELD_LOWER, s->lowpass);
214  av_frame_free(&s->cur);
215 
216  /* copy lower/upper field from next */
217  copy_picture_field(s, s->next, out, inlink, tff ? FIELD_LOWER : FIELD_UPPER, s->lowpass);
218  av_frame_free(&s->next);
219 
220  ret = ff_filter_frame(outlink, out);
221 
222  return ret;
223 }
224 
225 static const AVFilterPad inputs[] = {
226  {
227  .name = "default",
228  .type = AVMEDIA_TYPE_VIDEO,
229  .filter_frame = filter_frame,
230  },
231  { NULL }
232 };
233 
234 static const AVFilterPad outputs[] = {
235  {
236  .name = "default",
237  .type = AVMEDIA_TYPE_VIDEO,
238  .config_props = config_out_props,
239  },
240  { NULL }
241 };
242 
244  .name = "interlace",
245  .description = NULL_IF_CONFIG_SMALL("Convert progressive video into interlaced."),
246  .uninit = uninit,
247  .priv_class = &interlace_class,
248  .priv_size = sizeof(InterlaceContext),
250  .inputs = inputs,
251  .outputs = outputs,
252 };
int plane
Definition: avisynth_c.h:422
#define NULL
Definition: coverity.c:32
const char * s
Definition: avisynth_c.h:768
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
const AVPixFmtDescriptor * av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:2266
This structure describes decoded (raw) audio or video data.
Definition: frame.h:184
AVOption.
Definition: opt.h:245
static const AVFilterPad inputs[]
Definition: vf_interlace.c:225
planar YUV 4:4:4, 24bpp, (1 Cr & Cb sample per 1x1 Y samples)
Definition: pixfmt.h:67
misc image utilities
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
Main libavfilter public API header.
const char * desc
Definition: nvenc.c:101
int num
Numerator.
Definition: rational.h:59
AVFrame * ff_get_video_buffer(AVFilterLink *link, int w, int h)
Request a picture buffer with a specific set of permissions.
Definition: video.c:76
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
static enum AVPixelFormat formats_supported[]
Definition: vf_interlace.c:70
static int query_formats(AVFilterContext *ctx)
Definition: vf_interlace.c:77
BYTE int const BYTE * srcp
Definition: avisynth_c.h:813
const char * name
Pad name.
Definition: internal.h:59
AVFilterLink ** inputs
array of pointers to input links
Definition: avfilter.h:315
static int config_out_props(AVFilterLink *outlink)
Definition: vf_interlace.c:93
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:1189
static const AVFilterPad outputs[]
Definition: vf_interlace.c:234
planar YUV 4:2:0, 20bpp, (1 Cr & Cb sample per 2x2 Y & A samples)
Definition: pixfmt.h:102
uint8_t
#define av_cold
Definition: attributes.h:82
AVOptions.
int64_t pts
Presentation timestamp in time_base units (time when frame should be shown to user).
Definition: frame.h:268
planar YUV 4:4:0 full scale (JPEG), deprecated in favor of AV_PIX_FMT_YUV440P and setting color_range...
Definition: pixfmt.h:101
planar YUV 4:2:2, 16bpp, full scale (JPEG), deprecated in favor of AV_PIX_FMT_YUV422P and setting col...
Definition: pixfmt.h:75
#define AV_LOG_VERBOSE
Detailed information.
Definition: log.h:192
int interlaced_frame
The content of the picture is interlaced.
Definition: frame.h:322
#define av_log(a,...)
void(* lowpass_line)(uint8_t *dstp, ptrdiff_t linesize, const uint8_t *srcp, const uint8_t *srcp_above, const uint8_t *srcp_below)
Definition: interlace.h:52
A filter pad used for either input or output.
Definition: internal.h:53
FieldType
Definition: interlace.h:42
#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
void ff_interlace_init_x86(InterlaceContext *interlace)
uint8_t log2_chroma_h
Amount to shift the luma height right to find the chroma height.
Definition: pixdesc.h:101
BYTE * dstp
Definition: avisynth_c.h:813
#define AVERROR(e)
Definition: error.h:43
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:158
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:176
void * priv
private data for use by the filter
Definition: avfilter.h:322
AVFilter ff_vf_interlace
Definition: vf_interlace.c:243
simple assert() macros that are a bit more flexible than ISO C assert().
AVFrame * next
Definition: interlace.h:51
#define OFFSET(x)
Definition: vf_interlace.c:40
planar YUV 4:2:2, 16bpp, (1 Cr & Cb sample per 2x1 Y samples)
Definition: pixfmt.h:66
uint8_t nb_components
The number of components each pixel has, (1-4)
Definition: pixdesc.h:83
planar YUV 4:2:0, 12bpp, full scale (JPEG), deprecated in favor of AV_PIX_FMT_YUV420P and setting col...
Definition: pixfmt.h:74
#define FLAGS
Definition: vf_interlace.c:41
AVFormatContext * ctx
Definition: movenc.c:48
progressive to interlaced content filter, inspired by heavy debugging of tinterlace filter...
AVFrame * av_frame_clone(const AVFrame *src)
Create a new frame that references the same data as src.
Definition: frame.c:480
static av_cold void uninit(AVFilterContext *ctx)
Definition: vf_interlace.c:85
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:215
Descriptor that unambiguously describes how the bits of a pixel are stored in the up to 4 data planes...
Definition: pixdesc.h:81
AVFILTER_DEFINE_CLASS(interlace)
void * buf
Definition: avisynth_c.h:690
static void copy_picture_field(InterlaceContext *s, AVFrame *src_frame, AVFrame *dst_frame, AVFilterLink *inlink, enum FieldType field_type, int lowpass)
Definition: vf_interlace.c:130
planar YUV 4:1:0, 9bpp, (1 Cr & Cb sample per 4x4 Y samples)
Definition: pixfmt.h:68
Filter definition.
Definition: avfilter.h:144
const char * name
Filter name.
Definition: avfilter.h:148
AVFrame * cur
Definition: interlace.h:51
AVFilterLink ** outputs
array of pointers to output links
Definition: avfilter.h:319
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:198
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:62
Y , 8bpp.
Definition: pixfmt.h:70
static const AVOption interlace_options[]
Definition: vf_interlace.c:42
common internal and external API header
planar YUV 4:4:4, 24bpp, full scale (JPEG), deprecated in favor of AV_PIX_FMT_YUV444P and setting col...
Definition: pixfmt.h:76
enum ScanMode scan
Definition: interlace.h:49
int den
Denominator.
Definition: rational.h:60
int top_field_first
If the content is interlaced, is top field displayed first.
Definition: frame.h:327
static int filter_frame(AVFilterLink *inlink, AVFrame *buf)
Definition: vf_interlace.c:175
A list of supported formats for one end of a filter link.
Definition: formats.h:64
An instance of a filter.
Definition: avfilter.h:307
FILE * out
Definition: movenc.c:54
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:287
internal API functions
AVPixelFormat
Pixel format.
Definition: pixfmt.h:60
int av_frame_copy_props(AVFrame *dst, const AVFrame *src)
Copy only "metadata" fields from src to dst.
Definition: frame.c:589
#define AV_CEIL_RSHIFT(a, b)
Definition: common.h:58
static void lowpass_line_c(uint8_t *dstp, ptrdiff_t linesize, const uint8_t *srcp, const uint8_t *srcp_above, const uint8_t *srcp_below)
Definition: vf_interlace.c:56