FFmpeg
vf_weave.c
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1 /*
2  * Copyright (c) 2013 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/imgutils.h"
22 #include "libavutil/opt.h"
23 #include "libavutil/pixdesc.h"
24 #include "avfilter.h"
25 #include "internal.h"
26 
27 typedef struct WeaveContext {
28  const AVClass *class;
31  int nb_planes;
32  int planeheight[4];
33  int linesize[4];
34 
36 } WeaveContext;
37 
38 #define OFFSET(x) offsetof(WeaveContext, x)
39 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
40 
41 static const AVOption weave_options[] = {
42  { "first_field", "set first field", OFFSET(first_field), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS, "field"},
43  { "top", "set top field first", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "field"},
44  { "t", "set top field first", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "field"},
45  { "bottom", "set bottom field first", 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "field"},
46  { "b", "set bottom field first", 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "field"},
47  { NULL }
48 };
49 
51 
52 static int config_props_output(AVFilterLink *outlink)
53 {
54  AVFilterContext *ctx = outlink->src;
55  WeaveContext *s = ctx->priv;
56  AVFilterLink *inlink = ctx->inputs[0];
58  int ret;
59 
60  if (!s->double_weave) {
61  outlink->time_base.num = inlink->time_base.num * 2;
62  outlink->time_base.den = inlink->time_base.den;
63  outlink->frame_rate.num = inlink->frame_rate.num;
64  outlink->frame_rate.den = inlink->frame_rate.den * 2;
65  }
66  outlink->w = inlink->w;
67  outlink->h = inlink->h * 2;
68 
69  if ((ret = av_image_fill_linesizes(s->linesize, inlink->format, inlink->w)) < 0)
70  return ret;
71 
72  s->planeheight[1] = s->planeheight[2] = AV_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);
73  s->planeheight[0] = s->planeheight[3] = inlink->h;
74 
76 
77  return 0;
78 }
79 
81 {
82  AVFilterContext *ctx = inlink->dst;
83  WeaveContext *s = ctx->priv;
84  AVFilterLink *outlink = ctx->outputs[0];
85  AVFrame *out;
86  int i;
87  int weave;
88  int field1, field2;
89 
90  if (!s->prev) {
91  s->prev = in;
92  return 0;
93  }
94 
95  out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
96  if (!out) {
97  av_frame_free(&in);
98  av_frame_free(&s->prev);
99  return AVERROR(ENOMEM);
100  }
101  av_frame_copy_props(out, in);
102 
103  weave = (s->double_weave && !(inlink->frame_count_out & 1));
104  field1 = weave ? s->first_field : (!s->first_field);
105  field2 = weave ? (!s->first_field) : s->first_field;
106  for (i = 0; i < s->nb_planes; i++) {
107  av_image_copy_plane(out->data[i] + out->linesize[i] * field1,
108  out->linesize[i] * 2,
109  in->data[i], in->linesize[i],
110  s->linesize[i], s->planeheight[i]);
111  av_image_copy_plane(out->data[i] + out->linesize[i] * field2,
112  out->linesize[i] * 2,
113  s->prev->data[i], s->prev->linesize[i],
114  s->linesize[i], s->planeheight[i]);
115  }
116 
117  out->pts = s->double_weave ? s->prev->pts : in->pts / 2;
118  out->interlaced_frame = 1;
119  out->top_field_first = !s->first_field;
120 
121  if (!s->double_weave)
122  av_frame_free(&in);
123  av_frame_free(&s->prev);
124  if (s->double_weave)
125  s->prev = in;
126  return ff_filter_frame(outlink, out);
127 }
128 
130 {
131  WeaveContext *s = ctx->priv;
132 
133  av_frame_free(&s->prev);
134 }
135 
136 static const AVFilterPad weave_inputs[] = {
137  {
138  .name = "default",
139  .type = AVMEDIA_TYPE_VIDEO,
140  .filter_frame = filter_frame,
141  },
142  { NULL }
143 };
144 
145 static const AVFilterPad weave_outputs[] = {
146  {
147  .name = "default",
148  .type = AVMEDIA_TYPE_VIDEO,
149  .config_props = config_props_output,
150  },
151  { NULL }
152 };
153 
155  .name = "weave",
156  .description = NULL_IF_CONFIG_SMALL("Weave input video fields into frames."),
157  .priv_size = sizeof(WeaveContext),
158  .priv_class = &weave_class,
159  .uninit = uninit,
160  .inputs = weave_inputs,
161  .outputs = weave_outputs,
162 };
163 
165 {
166  WeaveContext *s = ctx->priv;
167 
168  if (!strcmp(ctx->filter->name, "doubleweave"))
169  s->double_weave = 1;
170 
171  return 0;
172 }
173 
174 #define doubleweave_options weave_options
175 AVFILTER_DEFINE_CLASS(doubleweave);
176 
178  .name = "doubleweave",
179  .description = NULL_IF_CONFIG_SMALL("Weave input video fields into double number of frames."),
180  .priv_size = sizeof(WeaveContext),
181  .priv_class = &doubleweave_class,
182  .init = init,
183  .uninit = uninit,
184  .inputs = weave_inputs,
185  .outputs = weave_outputs,
186 };
#define NULL
Definition: coverity.c:32
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:295
AVOption.
Definition: opt.h:246
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
static const AVFilterPad weave_inputs[]
Definition: vf_weave.c:136
int num
Numerator.
Definition: rational.h:59
int nb_planes
Definition: vf_weave.c:31
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
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:1080
AVFilter ff_vf_weave
Definition: vf_weave.c:154
#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:388
int interlaced_frame
The content of the picture is interlaced.
Definition: frame.h:442
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
uint8_t log2_chroma_h
Amount to shift the luma height right to find the chroma height.
Definition: pixdesc.h:101
#define OFFSET(x)
Definition: vf_weave.c:38
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
AVFormatContext * ctx
Definition: movenc.c:48
static av_cold int init(AVFilterContext *ctx)
Definition: vf_weave.c:164
#define s(width, name)
Definition: cbs_vp9.c:257
static const AVOption weave_options[]
Definition: vf_weave.c:41
static const AVFilterPad weave_outputs[]
Definition: vf_weave.c:145
int double_weave
Definition: vf_weave.c:30
static const AVFilterPad outputs[]
Definition: af_acontrast.c:203
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:326
Descriptor that unambiguously describes how the bits of a pixel are stored in the up to 4 data planes...
Definition: pixdesc.h:81
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
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
AVFilter ff_vf_doubleweave
Definition: vf_weave.c:177
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
Definition: vf_weave.c:80
const char * name
Filter name.
Definition: avfilter.h:148
static av_cold void uninit(AVFilterContext *ctx)
Definition: vf_weave.c:129
AVFilterLink ** outputs
array of pointers to output links
Definition: avfilter.h:350
int planeheight[4]
Definition: vf_weave.c:32
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:309
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
int linesize[4]
Definition: vf_weave.c:33
AVFrame * prev
Definition: vf_weave.c:35
int den
Denominator.
Definition: rational.h:60
#define FLAGS
Definition: vf_weave.c:39
int top_field_first
If the content is interlaced, is top field displayed first.
Definition: frame.h:447
An instance of a filter.
Definition: avfilter.h:338
AVFILTER_DEFINE_CLASS(weave)
FILE * out
Definition: movenc.c:54
static int config_props_output(AVFilterLink *outlink)
Definition: vf_weave.c:52
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
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
const AVFilter * filter
the AVFilter of which this is an instance
Definition: avfilter.h:341
int first_field
Definition: vf_weave.c:29
for(j=16;j >0;--j)
int av_frame_copy_props(AVFrame *dst, const AVFrame *src)
Copy only "metadata" fields from src to dst.
Definition: frame.c:654
#define AV_CEIL_RSHIFT(a, b)
Definition: common.h:58