FFmpeg
vf_telecine.c
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1 /*
2  * Copyright (c) 2012 Rudolf Polzer
3  * Copyright (c) 2013 Paul B Mahol
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 telecine filter, heavily based from mpv-player:TOOLS/vf_dlopen/telecine.c by
24  * Rudolf Polzer.
25  */
26 
27 #include "libavutil/avstring.h"
28 #include "libavutil/imgutils.h"
29 #include "libavutil/opt.h"
30 #include "libavutil/pixdesc.h"
31 #include "avfilter.h"
32 #include "filters.h"
33 #include "formats.h"
34 #include "internal.h"
35 #include "video.h"
36 
37 typedef struct TelecineContext {
38  const AVClass *class;
40  char *pattern;
41  unsigned int pattern_pos;
42  int64_t start_time;
43 
46  int out_cnt;
47  int occupied;
48 
49  int nb_planes;
50  int planeheight[4];
51  int stride[4];
52 
56 
57 #define OFFSET(x) offsetof(TelecineContext, x)
58 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
59 
60 static const AVOption telecine_options[] = {
61  {"first_field", "select first field", OFFSET(first_field), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS, .unit = "field"},
62  {"top", "select top field first", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, .unit = "field"},
63  {"t", "select top field first", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, .unit = "field"},
64  {"bottom", "select bottom field first", 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, .unit = "field"},
65  {"b", "select bottom field first", 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, .unit = "field"},
66  {"pattern", "pattern that describe for how many fields a frame is to be displayed", OFFSET(pattern), AV_OPT_TYPE_STRING, {.str="23"}, 0, 0, FLAGS},
67  {NULL}
68 };
69 
70 AVFILTER_DEFINE_CLASS(telecine);
71 
73 {
74  TelecineContext *s = ctx->priv;
75  const char *p;
76  int max = 0;
77 
78  if (!strlen(s->pattern)) {
79  av_log(ctx, AV_LOG_ERROR, "No pattern provided.\n");
80  return AVERROR_INVALIDDATA;
81  }
82 
83  for (p = s->pattern; *p; p++) {
84  if (!av_isdigit(*p)) {
85  av_log(ctx, AV_LOG_ERROR, "Provided pattern includes non-numeric characters.\n");
86  return AVERROR_INVALIDDATA;
87  }
88 
89  max = FFMAX(*p - '0', max);
90  s->pts.num += 2;
91  s->pts.den += *p - '0';
92  }
93 
94  s->start_time = AV_NOPTS_VALUE;
95 
96  s->out_cnt = (max + 1) / 2;
97  av_log(ctx, AV_LOG_INFO, "Telecine pattern %s yields up to %d frames per frame, pts advance factor: %d/%d\n",
98  s->pattern, s->out_cnt, s->pts.num, s->pts.den);
99 
100  return 0;
101 }
102 
104 {
105  int reject_flags = AV_PIX_FMT_FLAG_BITSTREAM |
108 
109  return ff_set_common_formats(ctx, ff_formats_pixdesc_filter(0, reject_flags));
110 }
111 
113 {
114  TelecineContext *s = inlink->dst->priv;
116  int i, ret;
117 
118  s->temp = ff_get_video_buffer(inlink, inlink->w, inlink->h);
119  if (!s->temp)
120  return AVERROR(ENOMEM);
121  for (i = 0; i < s->out_cnt; i++) {
122  s->frame[i] = ff_get_video_buffer(inlink, inlink->w, inlink->h);
123  if (!s->frame[i])
124  return AVERROR(ENOMEM);
125  }
126 
127  if ((ret = av_image_fill_linesizes(s->stride, inlink->format, inlink->w)) < 0)
128  return ret;
129 
130  s->planeheight[1] = s->planeheight[2] = AV_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);
131  s->planeheight[0] = s->planeheight[3] = inlink->h;
132 
133  s->nb_planes = av_pix_fmt_count_planes(inlink->format);
134 
135  return 0;
136 }
137 
138 static int config_output(AVFilterLink *outlink)
139 {
140  AVFilterContext *ctx = outlink->src;
141  TelecineContext *s = ctx->priv;
142  const AVFilterLink *inlink = ctx->inputs[0];
143  AVRational fps = inlink->frame_rate;
144 
145  if (!fps.num || !fps.den) {
146  av_log(ctx, AV_LOG_ERROR, "The input needs a constant frame rate; "
147  "current rate of %d/%d is invalid\n", fps.num, fps.den);
148  return AVERROR(EINVAL);
149  }
150  fps = av_mul_q(fps, av_inv_q(s->pts));
151  av_log(ctx, AV_LOG_VERBOSE, "FPS: %d/%d -> %d/%d\n",
152  inlink->frame_rate.num, inlink->frame_rate.den, fps.num, fps.den);
153 
154  outlink->frame_rate = fps;
155  outlink->time_base = av_mul_q(inlink->time_base, s->pts);
156  av_log(ctx, AV_LOG_VERBOSE, "TB: %d/%d -> %d/%d\n",
157  inlink->time_base.num, inlink->time_base.den, outlink->time_base.num, outlink->time_base.den);
158 
159  s->ts_unit = av_inv_q(av_mul_q(fps, outlink->time_base));
160 
161  return 0;
162 }
163 
164 static int filter_frame(AVFilterLink *inlink, AVFrame *inpicref)
165 {
166  AVFilterContext *ctx = inlink->dst;
167  AVFilterLink *outlink = ctx->outputs[0];
168  TelecineContext *s = ctx->priv;
169  int i, len, ret = 0, nout = 0;
170 
171  if (s->start_time == AV_NOPTS_VALUE)
172  s->start_time = inpicref->pts;
173 
174  len = s->pattern[s->pattern_pos] - '0';
175 
176  s->pattern_pos++;
177  if (!s->pattern[s->pattern_pos])
178  s->pattern_pos = 0;
179 
180  if (!len) { // do not output any field from this frame
181  av_frame_free(&inpicref);
182  return 0;
183  }
184 
185  if (s->occupied) {
186  ret = ff_inlink_make_frame_writable(inlink, &s->frame[nout]);
187  if (ret < 0) {
188  av_frame_free(&inpicref);
189  return ret;
190  }
191  for (i = 0; i < s->nb_planes; i++) {
192  // fill in the EARLIER field from the buffered pic
193  av_image_copy_plane(s->frame[nout]->data[i] + s->frame[nout]->linesize[i] * s->first_field,
194  s->frame[nout]->linesize[i] * 2,
195  s->temp->data[i] + s->temp->linesize[i] * s->first_field,
196  s->temp->linesize[i] * 2,
197  s->stride[i],
198  (s->planeheight[i] - s->first_field + 1) / 2);
199  // fill in the LATER field from the new pic
200  av_image_copy_plane(s->frame[nout]->data[i] + s->frame[nout]->linesize[i] * !s->first_field,
201  s->frame[nout]->linesize[i] * 2,
202  inpicref->data[i] + inpicref->linesize[i] * !s->first_field,
203  inpicref->linesize[i] * 2,
204  s->stride[i],
205  (s->planeheight[i] - !s->first_field + 1) / 2);
206  }
207 #if FF_API_INTERLACED_FRAME
209  s->frame[nout]->interlaced_frame = 1;
210  s->frame[nout]->top_field_first = !s->first_field;
212 #endif
213  s->frame[nout]->flags |= AV_FRAME_FLAG_INTERLACED;
214  if (s->first_field)
215  s->frame[nout]->flags &= ~AV_FRAME_FLAG_TOP_FIELD_FIRST;
216  else
217  s->frame[nout]->flags |= AV_FRAME_FLAG_TOP_FIELD_FIRST;
218  nout++;
219  len--;
220  s->occupied = 0;
221  }
222 
223  while (len >= 2) {
224  // output THIS image as-is
225  ret = ff_inlink_make_frame_writable(inlink, &s->frame[nout]);
226  if (ret < 0) {
227  av_frame_free(&inpicref);
228  return ret;
229  }
230  for (i = 0; i < s->nb_planes; i++)
231  av_image_copy_plane(s->frame[nout]->data[i], s->frame[nout]->linesize[i],
232  inpicref->data[i], inpicref->linesize[i],
233  s->stride[i],
234  s->planeheight[i]);
235 #if FF_API_INTERLACED_FRAME
237  s->frame[nout]->interlaced_frame = inpicref->interlaced_frame;
238  s->frame[nout]->top_field_first = inpicref->top_field_first;
240 #endif
241  s->frame[nout]->flags |= (inpicref->flags & (AV_FRAME_FLAG_INTERLACED | AV_FRAME_FLAG_TOP_FIELD_FIRST));
242  nout++;
243  len -= 2;
244  }
245 
246  if (len >= 1) {
247  // copy THIS image to the buffer, we need it later
248  for (i = 0; i < s->nb_planes; i++)
249  av_image_copy_plane(s->temp->data[i], s->temp->linesize[i],
250  inpicref->data[i], inpicref->linesize[i],
251  s->stride[i],
252  s->planeheight[i]);
253  s->occupied = 1;
254  }
255 
256  for (i = 0; i < nout; i++) {
257  AVFrame *frame = av_frame_clone(s->frame[i]);
258  int interlaced = frame ? !!(frame->flags & AV_FRAME_FLAG_INTERLACED) : 0;
259  int tff = frame ? !!(frame->flags & AV_FRAME_FLAG_TOP_FIELD_FIRST) : 0;
260 
261  if (!frame) {
262  av_frame_free(&inpicref);
263  return AVERROR(ENOMEM);
264  }
265 
266  av_frame_copy_props(frame, inpicref);
267 #if FF_API_INTERLACED_FRAME
269  frame->interlaced_frame = interlaced;
270  frame->top_field_first = tff;
272 #endif
273  if (interlaced)
275  else
276  frame->flags &= ~AV_FRAME_FLAG_INTERLACED;
277  if (tff)
279  else
281  frame->pts = ((s->start_time == AV_NOPTS_VALUE) ? 0 : s->start_time) +
282  av_rescale(outlink->frame_count_in, s->ts_unit.num,
283  s->ts_unit.den);
284  ret = ff_filter_frame(outlink, frame);
285  }
286  av_frame_free(&inpicref);
287 
288  return ret;
289 }
290 
292 {
293  TelecineContext *s = ctx->priv;
294  int i;
295 
296  av_frame_free(&s->temp);
297  for (i = 0; i < s->out_cnt; i++)
298  av_frame_free(&s->frame[i]);
299 }
300 
301 static const AVFilterPad telecine_inputs[] = {
302  {
303  .name = "default",
304  .type = AVMEDIA_TYPE_VIDEO,
305  .filter_frame = filter_frame,
306  .config_props = config_input,
307  },
308 };
309 
310 static const AVFilterPad telecine_outputs[] = {
311  {
312  .name = "default",
313  .type = AVMEDIA_TYPE_VIDEO,
314  .config_props = config_output,
315  },
316 };
317 
319  .name = "telecine",
320  .description = NULL_IF_CONFIG_SMALL("Apply a telecine pattern."),
321  .priv_size = sizeof(TelecineContext),
322  .priv_class = &telecine_class,
323  .init = init,
324  .uninit = uninit,
328 };
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_ENABLE_DEPRECATION_WARNINGS
#define FF_ENABLE_DEPRECATION_WARNINGS
Definition: internal.h:73
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
TelecineContext::pattern_pos
unsigned int pattern_pos
Definition: vf_telecine.c:41
ff_filter_frame
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:1015
av_pix_fmt_desc_get
const AVPixFmtDescriptor * av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:2965
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:160
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:374
pixdesc.h
AVFrame::pts
int64_t pts
Presentation timestamp in time_base units (time when frame should be shown to user).
Definition: frame.h:486
AVOption
AVOption.
Definition: opt.h:357
FILTER_QUERY_FUNC
#define FILTER_QUERY_FUNC(func)
Definition: internal.h:159
TelecineContext::occupied
int occupied
Definition: vf_telecine.c:47
AV_LOG_VERBOSE
#define AV_LOG_VERBOSE
Detailed information.
Definition: log.h:196
TelecineContext::temp
AVFrame * temp
Definition: vf_telecine.c:54
max
#define max(a, b)
Definition: cuda_runtime.h:33
AVFrame::flags
int flags
Frame flags, a combination of AV_FRAME_FLAGS.
Definition: frame.h:646
FFMAX
#define FFMAX(a, b)
Definition: macros.h:47
AVFilter::name
const char * name
Filter name.
Definition: avfilter.h:170
telecine_options
static const AVOption telecine_options[]
Definition: vf_telecine.c:60
video.h
AVFrame::data
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:395
av_image_copy_plane
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:374
AV_FRAME_FLAG_TOP_FIELD_FIRST
#define AV_FRAME_FLAG_TOP_FIELD_FIRST
A flag to mark frames where the top field is displayed first if the content is interlaced.
Definition: frame.h:638
formats.h
av_pix_fmt_count_planes
int av_pix_fmt_count_planes(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:3005
AV_PIX_FMT_FLAG_HWACCEL
#define AV_PIX_FMT_FLAG_HWACCEL
Pixel format is an HW accelerated format.
Definition: pixdesc.h:128
filter_frame
static int filter_frame(AVFilterLink *inlink, AVFrame *inpicref)
Definition: vf_telecine.c:164
AVRational::num
int num
Numerator.
Definition: rational.h:59
AVFilterPad
A filter pad used for either input or output.
Definition: internal.h:33
AVFrame::interlaced_frame
attribute_deprecated int interlaced_frame
The content of the picture is interlaced.
Definition: frame.h:551
TelecineContext::pattern
char * pattern
Definition: vf_telecine.c:40
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:180
av_cold
#define av_cold
Definition: attributes.h:90
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:868
uninit
static av_cold void uninit(AVFilterContext *ctx)
Definition: vf_telecine.c:291
TelecineContext::stride
int stride[4]
Definition: vf_telecine.c:51
av_image_fill_linesizes
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
TelecineContext::out_cnt
int out_cnt
Definition: vf_telecine.c:46
s
#define s(width, name)
Definition: cbs_vp9.c:198
AV_CEIL_RSHIFT
#define AV_CEIL_RSHIFT(a, b)
Definition: common.h:59
telecine_inputs
static const AVFilterPad telecine_inputs[]
Definition: vf_telecine.c:301
filters.h
ctx
AVFormatContext * ctx
Definition: movenc.c:49
av_frame_clone
AVFrame * av_frame_clone(const AVFrame *src)
Create a new frame that references the same data as src.
Definition: frame.c:593
FILTER_INPUTS
#define FILTER_INPUTS(array)
Definition: internal.h:182
ff_inlink_make_frame_writable
int ff_inlink_make_frame_writable(AVFilterLink *link, AVFrame **rframe)
Make sure a frame is writable.
Definition: avfilter.c:1489
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:66
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:709
AVRational
Rational number (pair of numerator and denominator).
Definition: rational.h:58
config_input
static int config_input(AVFilterLink *inlink)
Definition: vf_telecine.c:112
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:94
TelecineContext::frame
AVFrame * frame[5]
Definition: vf_telecine.c:53
AV_NOPTS_VALUE
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:248
query_formats
static int query_formats(AVFilterContext *ctx)
Definition: vf_telecine.c:103
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
TelecineContext::planeheight
int planeheight[4]
Definition: vf_telecine.c:50
av_isdigit
static av_const int av_isdigit(int c)
Locale-independent conversion of ASCII isdigit.
Definition: avstring.h:202
AV_LOG_INFO
#define AV_LOG_INFO
Standard information.
Definition: log.h:191
internal.h
interlaced
uint8_t interlaced
Definition: mxfenc.c:2264
ff_formats_pixdesc_filter
AVFilterFormats * ff_formats_pixdesc_filter(unsigned want, unsigned rej)
Construct a formats list containing all pixel formats with certain properties.
Definition: formats.c:554
TelecineContext
Definition: vf_telecine.c:37
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:256
AVFrame::top_field_first
attribute_deprecated int top_field_first
If the content is interlaced, is top field displayed first.
Definition: frame.h:559
ff_vf_telecine
const AVFilter ff_vf_telecine
Definition: vf_telecine.c:318
TelecineContext::ts_unit
AVRational ts_unit
Definition: vf_telecine.c:45
av_inv_q
static av_always_inline AVRational av_inv_q(AVRational q)
Invert a rational.
Definition: rational.h:159
len
int len
Definition: vorbis_enc_data.h:426
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_FRAME_FLAG_INTERLACED
#define AV_FRAME_FLAG_INTERLACED
A flag to mark frames whose content is interlaced.
Definition: frame.h:633
AVFilter
Filter definition.
Definition: avfilter.h:166
TelecineContext::pts
AVRational pts
Definition: vf_telecine.c:44
ret
ret
Definition: filter_design.txt:187
frame
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 the filter must be ready for frames arriving randomly on any input any filter with several inputs will most likely require some kind of queuing mechanism It is perfectly acceptable to have a limited queue and to drop frames when the inputs are too unbalanced request_frame For filters that do not use the this method is called when a frame is wanted on an output For a it should directly call filter_frame on the corresponding output For a if there are queued frames already one of these frames should be pushed If the filter should request a frame on one of its repeatedly until at least one frame has been pushed Return or at least make progress towards producing a frame
Definition: filter_design.txt:264
TelecineContext::first_field
int first_field
Definition: vf_telecine.c:39
OFFSET
#define OFFSET(x)
Definition: vf_telecine.c:57
telecine_outputs
static const AVFilterPad telecine_outputs[]
Definition: vf_telecine.c:310
AVRational::den
int den
Denominator.
Definition: rational.h:60
AV_OPT_TYPE_INT
@ AV_OPT_TYPE_INT
Definition: opt.h:245
avfilter.h
init
static av_cold int init(AVFilterContext *ctx)
Definition: vf_telecine.c:72
av_mul_q
AVRational av_mul_q(AVRational b, AVRational c)
Multiply two rationals.
Definition: rational.c:80
AVFilterContext
An instance of a filter.
Definition: avfilter.h:407
FF_DISABLE_DEPRECATION_WARNINGS
#define FF_DISABLE_DEPRECATION_WARNINGS
Definition: internal.h:72
desc
const char * desc
Definition: libsvtav1.c:79
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
TelecineContext::start_time
int64_t start_time
Definition: vf_telecine.c:42
AVPixFmtDescriptor
Descriptor that unambiguously describes how the bits of a pixel are stored in the up to 4 data planes...
Definition: pixdesc.h:69
FILTER_OUTPUTS
#define FILTER_OUTPUTS(array)
Definition: internal.h:183
AVFILTER_DEFINE_CLASS
AVFILTER_DEFINE_CLASS(telecine)
config_output
static int config_output(AVFilterLink *outlink)
Definition: vf_telecine.c:138
imgutils.h
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:419
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:27
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:61
avstring.h
AV_OPT_TYPE_STRING
@ AV_OPT_TYPE_STRING
Definition: opt.h:249
first_field
static int first_field(const struct video_data *s)
Definition: v4l2.c:247
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
AV_OPT_TYPE_CONST
@ AV_OPT_TYPE_CONST
Definition: opt.h:254
FLAGS
#define FLAGS
Definition: vf_telecine.c:58
TelecineContext::nb_planes
int nb_planes
Definition: vf_telecine.c:49