FFmpeg
vapoursynth.c
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1 /*
2  * This file is part of FFmpeg.
3  *
4  * FFmpeg is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation; either
7  * version 2.1 of the License, or (at your option) any later version.
8  *
9  * FFmpeg is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12  * Lesser General Public License for more details.
13  *
14  * You should have received a copy of the GNU Lesser General Public
15  * License along with FFmpeg; if not, write to the Free Software
16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17  */
18 
19 /**
20 * @file
21 * VapourSynth demuxer
22 *
23 * Synthesizes vapour (?)
24 */
25 
26 #include <limits.h>
27 
28 #include <VapourSynth.h>
29 #include <VSScript.h>
30 
31 #include "libavutil/avassert.h"
32 #include "libavutil/avstring.h"
33 #include "libavutil/eval.h"
34 #include "libavutil/frame.h"
35 #include "libavutil/imgutils.h"
36 #include "libavutil/mem.h"
37 #include "libavutil/opt.h"
38 #include "libavutil/pixdesc.h"
39 #include "avformat.h"
40 #include "demux.h"
41 #include "internal.h"
42 
43 struct VSState {
44  VSScript *vss;
45 };
46 
47 typedef struct VSContext {
48  const AVClass *class;
49 
51 
52  const VSAPI *vsapi;
53  VSCore *vscore;
54 
55  VSNodeRef *outnode;
56  int is_cfr;
58 
59  int c_order[4];
60 
61  /* options */
62  int64_t max_script_size;
63 } VSContext;
64 
65 #define OFFSET(x) offsetof(VSContext, x)
66 #define A AV_OPT_FLAG_AUDIO_PARAM
67 #define D AV_OPT_FLAG_DECODING_PARAM
68 static const AVOption options[] = {
69  {"max_script_size", "set max file size supported (in bytes)", OFFSET(max_script_size), AV_OPT_TYPE_INT64, {.i64 = 1 * 1024 * 1024}, 0, SIZE_MAX - 1, A|D},
70  {NULL}
71 };
72 
73 static void free_vss_state(void *opaque, uint8_t *data)
74 {
75  struct VSState *vss = opaque;
76 
77  if (vss->vss) {
78  vsscript_freeScript(vss->vss);
79  vsscript_finalize();
80  }
81 }
82 
84 {
85  VSContext *vs = s->priv_data;
86 
87  if (vs->outnode)
88  vs->vsapi->freeNode(vs->outnode);
89 
91 
92  vs->vsapi = NULL;
93  vs->vscore = NULL;
94  vs->outnode = NULL;
95 
96  return 0;
97 }
98 
100 {
102  const AVPixFmtDescriptor *pd;
103  if (other == AV_PIX_FMT_NONE || other == pixfmt)
104  return 1; // not affected by byte order
106  return pd && (!!HAVE_BIGENDIAN == !!(pd->flags & AV_PIX_FMT_FLAG_BE));
107 }
108 
109 static av_cold enum AVPixelFormat match_pixfmt(const VSFormat *vsf, int c_order[4])
110 {
111  static const int yuv_order[4] = {0, 1, 2, 0};
112  static const int rgb_order[4] = {1, 2, 0, 0};
113  const AVPixFmtDescriptor *pd;
114 
115  for (pd = av_pix_fmt_desc_next(NULL); pd; pd = av_pix_fmt_desc_next(pd)) {
116  int is_rgb, is_yuv, i;
117  const int *order;
118  enum AVPixelFormat pixfmt;
119 
121 
125  continue;
126 
127  if (pd->log2_chroma_w != vsf->subSamplingW ||
128  pd->log2_chroma_h != vsf->subSamplingH)
129  continue;
130 
131  is_rgb = vsf->colorFamily == cmRGB;
132  if (is_rgb != !!(pd->flags & AV_PIX_FMT_FLAG_RGB))
133  continue;
134 
135  is_yuv = vsf->colorFamily == cmYUV ||
136  vsf->colorFamily == cmYCoCg ||
137  vsf->colorFamily == cmGray;
138  if (!is_rgb && !is_yuv)
139  continue;
140 
141  if (vsf->sampleType != ((pd->flags & AV_PIX_FMT_FLAG_FLOAT) ? stFloat : stInteger))
142  continue;
143 
144  if (av_pix_fmt_count_planes(pixfmt) != vsf->numPlanes)
145  continue;
146 
147  if (!is_native_endian(pixfmt))
148  continue;
149 
150  order = is_yuv ? yuv_order : rgb_order;
151 
152  for (i = 0; i < pd->nb_components; i++) {
153  const AVComponentDescriptor *c = &pd->comp[i];
154  if (order[c->plane] != i ||
155  c->offset != 0 || c->shift != 0 ||
156  c->step != vsf->bytesPerSample ||
157  c->depth != vsf->bitsPerSample)
158  goto cont;
159  }
160 
161  // Use it.
162  memcpy(c_order, order, sizeof(int[4]));
163  return pixfmt;
164 
165  cont: ;
166  }
167 
168  return AV_PIX_FMT_NONE;
169 }
170 
172 {
173  AVStream *st;
174  AVIOContext *pb = s->pb;
175  VSContext *vs = s->priv_data;
176  int64_t sz = avio_size(pb);
177  char *buf = NULL;
178  char dummy;
179  const VSVideoInfo *info;
180  struct VSState *vss_state;
181  int err = 0;
182 
183  vss_state = av_mallocz(sizeof(*vss_state));
184  if (!vss_state) {
185  err = AVERROR(ENOMEM);
186  goto done;
187  }
188 
189  vs->vss_state = av_buffer_create(NULL, 0, free_vss_state, vss_state, 0);
190  if (!vs->vss_state) {
191  err = AVERROR(ENOMEM);
192  av_free(vss_state);
193  goto done;
194  }
195 
196  if (!vsscript_init()) {
197  av_log(s, AV_LOG_ERROR, "Failed to initialize VSScript (possibly PYTHONPATH not set).\n");
198  err = AVERROR_EXTERNAL;
199  goto done;
200  }
201 
202  if (vsscript_createScript(&vss_state->vss)) {
203  av_log(s, AV_LOG_ERROR, "Failed to create script instance.\n");
204  err = AVERROR_EXTERNAL;
205  vsscript_finalize();
206  goto done;
207  }
208 
209  if (sz < 0 || sz > vs->max_script_size) {
210  if (sz < 0)
211  av_log(s, AV_LOG_WARNING, "Could not determine file size\n");
212  sz = vs->max_script_size;
213  }
214 
215  buf = av_malloc(sz + 1);
216  if (!buf) {
217  err = AVERROR(ENOMEM);
218  goto done;
219  }
220  sz = avio_read(pb, buf, sz);
221 
222  if (sz < 0) {
223  av_log(s, AV_LOG_ERROR, "Could not read script.\n");
224  err = sz;
225  goto done;
226  }
227 
228  // Data left means our buffer (the max_script_size option) is too small
229  if (avio_read(pb, &dummy, 1) == 1) {
230  av_log(s, AV_LOG_ERROR, "File size is larger than max_script_size option "
231  "value %"PRIi64", consider increasing the max_script_size option\n",
232  vs->max_script_size);
234  goto done;
235  }
236 
237  buf[sz] = '\0';
238  if (vsscript_evaluateScript(&vss_state->vss, buf, s->url, 0)) {
239  const char *msg = vsscript_getError(vss_state->vss);
240  av_log(s, AV_LOG_ERROR, "Failed to parse script: %s\n", msg ? msg : "(unknown)");
241  err = AVERROR_EXTERNAL;
242  goto done;
243  }
244 
245  vs->vsapi = vsscript_getVSApi();
246  vs->vscore = vsscript_getCore(vss_state->vss);
247 
248  vs->outnode = vsscript_getOutput(vss_state->vss, 0);
249  if (!vs->outnode) {
250  av_log(s, AV_LOG_ERROR, "Could not get script output node.\n");
251  err = AVERROR_EXTERNAL;
252  goto done;
253  }
254 
255  st = avformat_new_stream(s, NULL);
256  if (!st) {
257  err = AVERROR(ENOMEM);
258  goto done;
259  }
260 
261  info = vs->vsapi->getVideoInfo(vs->outnode);
262 
263  if (!info->format || !info->width || !info->height) {
264  av_log(s, AV_LOG_ERROR, "Non-constant input format not supported.\n");
265  err = AVERROR_PATCHWELCOME;
266  goto done;
267  }
268 
269  if (info->fpsDen) {
270  vs->is_cfr = 1;
271  avpriv_set_pts_info(st, 64, info->fpsDen, info->fpsNum);
272  st->duration = info->numFrames;
273  } else {
274  // VFR. Just set "something".
275  avpriv_set_pts_info(st, 64, 1, AV_TIME_BASE);
276  s->ctx_flags |= AVFMTCTX_UNSEEKABLE;
277  }
278 
281  st->codecpar->width = info->width;
282  st->codecpar->height = info->height;
283  st->codecpar->format = match_pixfmt(info->format, vs->c_order);
284 
285  if (st->codecpar->format == AV_PIX_FMT_NONE) {
286  av_log(s, AV_LOG_ERROR, "Unsupported VS pixel format %s\n", info->format->name);
287  err = AVERROR_EXTERNAL;
288  goto done;
289  }
290  av_log(s, AV_LOG_VERBOSE, "VS format %s -> pixfmt %s\n", info->format->name,
292 
293  if (info->format->colorFamily == cmYCoCg)
295 
296 done:
297  av_free(buf);
298  return err;
299 }
300 
301 static void free_frame(void *opaque, uint8_t *data)
302 {
303  AVFrame *frame = (AVFrame *)data;
304 
306 }
307 
308 static int get_vs_prop_int(AVFormatContext *s, const VSMap *map, const char *name, int def)
309 {
310  VSContext *vs = s->priv_data;
311  int64_t res;
312  int err = 1;
313 
314  res = vs->vsapi->propGetInt(map, name, 0, &err);
315  return err || res < INT_MIN || res > INT_MAX ? def : res;
316 }
317 
319  const VSAPI *vsapi;
320  const VSFrameRef *frame;
322 };
323 
324 static void free_vsframe_ref(void *opaque, uint8_t *data)
325 {
326  struct vsframe_ref_data *d = opaque;
327 
328  if (d->frame)
329  d->vsapi->freeFrame(d->frame);
330 
331  av_buffer_unref(&d->vss_state);
332 
333  av_free(d);
334 }
335 
337 {
338  VSContext *vs = s->priv_data;
339  AVStream *st = s->streams[0];
340  AVFrame *frame = NULL;
341  char vserr[80];
342  const VSFrameRef *vsframe;
343  const VSVideoInfo *info = vs->vsapi->getVideoInfo(vs->outnode);
344  const VSMap *props;
345  const AVPixFmtDescriptor *desc;
346  AVBufferRef *vsframe_ref = NULL;
347  struct vsframe_ref_data *ref_data;
348  int err = 0;
349  int i;
350 
351  if (vs->current_frame >= info->numFrames)
352  return AVERROR_EOF;
353 
354  ref_data = av_mallocz(sizeof(*ref_data));
355  if (!ref_data) {
356  err = AVERROR(ENOMEM);
357  goto end;
358  }
359 
360  // (the READONLY flag is important because the ref is reused for plane data)
361  vsframe_ref = av_buffer_create(NULL, 0, free_vsframe_ref, ref_data, AV_BUFFER_FLAG_READONLY);
362  if (!vsframe_ref) {
363  err = AVERROR(ENOMEM);
364  av_free(ref_data);
365  goto end;
366  }
367 
368  vsframe = vs->vsapi->getFrame(vs->current_frame, vs->outnode, vserr, sizeof(vserr));
369  if (!vsframe) {
370  av_log(s, AV_LOG_ERROR, "Error getting frame: %s\n", vserr);
371  err = AVERROR_EXTERNAL;
372  goto end;
373  }
374 
375  ref_data->vsapi = vs->vsapi;
376  ref_data->frame = vsframe;
377 
378  ref_data->vss_state = av_buffer_ref(vs->vss_state);
379  if (!ref_data->vss_state) {
380  err = AVERROR(ENOMEM);
381  goto end;
382  }
383 
384  props = vs->vsapi->getFramePropsRO(vsframe);
385 
386  frame = av_frame_alloc();
387  if (!frame) {
388  err = AVERROR(ENOMEM);
389  goto end;
390  }
391 
392  frame->format = st->codecpar->format;
393  frame->width = st->codecpar->width;
394  frame->height = st->codecpar->height;
395  frame->colorspace = st->codecpar->color_space;
396 
397  // Values according to ISO/IEC 14496-10.
398  frame->colorspace = get_vs_prop_int(s, props, "_Matrix", frame->colorspace);
399  frame->color_primaries = get_vs_prop_int(s, props, "_Primaries", frame->color_primaries);
400  frame->color_trc = get_vs_prop_int(s, props, "_Transfer", frame->color_trc);
401 
402  if (get_vs_prop_int(s, props, "_ColorRange", 1) == 0)
403  frame->color_range = AVCOL_RANGE_JPEG;
404 
405  frame->sample_aspect_ratio.num = get_vs_prop_int(s, props, "_SARNum", 0);
406  frame->sample_aspect_ratio.den = get_vs_prop_int(s, props, "_SARDen", 1);
407 
408  av_assert0(vs->vsapi->getFrameWidth(vsframe, 0) == frame->width);
409  av_assert0(vs->vsapi->getFrameHeight(vsframe, 0) == frame->height);
410 
411  desc = av_pix_fmt_desc_get(frame->format);
412 
413  for (i = 0; i < info->format->numPlanes; i++) {
414  int p = vs->c_order[i];
415  ptrdiff_t plane_h = frame->height;
416 
417  frame->data[i] = (void *)vs->vsapi->getReadPtr(vsframe, p);
418  frame->linesize[i] = vs->vsapi->getStride(vsframe, p);
419 
420  frame->buf[i] = av_buffer_ref(vsframe_ref);
421  if (!frame->buf[i]) {
422  err = AVERROR(ENOMEM);
423  goto end;
424  }
425 
426  // Each plane needs an AVBufferRef that indicates the correct plane
427  // memory range. VapourSynth doesn't even give us the memory range,
428  // so make up a bad guess to make FFmpeg happy (even if almost nothing
429  // checks the memory range).
430  if (i == 1 || i == 2)
431  plane_h = AV_CEIL_RSHIFT(plane_h, desc->log2_chroma_h);
432  frame->buf[i]->data = frame->data[i];
433  frame->buf[i]->size = frame->linesize[i] * plane_h;
434  }
435 
436  pkt->buf = av_buffer_create((uint8_t*)frame, sizeof(*frame),
437  free_frame, NULL, 0);
438  if (!pkt->buf) {
439  err = AVERROR(ENOMEM);
440  goto end;
441  }
442 
443  frame = NULL; // pkt owns it now
444 
445  pkt->data = pkt->buf->data;
446  pkt->size = pkt->buf->size;
448 
449  if (vs->is_cfr)
450  pkt->pts = vs->current_frame;
451 
452  vs->current_frame++;
453 
454 end:
456  av_buffer_unref(&vsframe_ref);
457  return err;
458 }
459 
460 static int read_seek_vs(AVFormatContext *s, int stream_idx, int64_t ts, int flags)
461 {
462  VSContext *vs = s->priv_data;
463 
464  if (!vs->is_cfr)
465  return AVERROR(ENOSYS);
466 
467  vs->current_frame = FFMIN(FFMAX(0, ts), s->streams[0]->duration);
468  return 0;
469 }
470 
471 static av_cold int probe_vs(const AVProbeData *p)
472 {
473  // Explicitly do not support this. VS scripts are written in Python, and
474  // can run arbitrary code on the user's system.
475  return 0;
476 }
477 
478 static const AVClass class_vs = {
479  .class_name = "VapourSynth demuxer",
480  .item_name = av_default_item_name,
481  .option = options,
482  .version = LIBAVUTIL_VERSION_INT,
483 };
484 
486  .p.name = "vapoursynth",
487  .p.long_name = NULL_IF_CONFIG_SMALL("VapourSynth demuxer"),
488  .p.priv_class = &class_vs,
489  .priv_data_size = sizeof(VSContext),
490  .flags_internal = FF_INFMT_FLAG_INIT_CLEANUP,
491  .read_probe = probe_vs,
496 };
av_pix_fmt_swap_endianness
enum AVPixelFormat av_pix_fmt_swap_endianness(enum AVPixelFormat pix_fmt)
Utility function to swap the endianness of a pixel format.
Definition: pixdesc.c:3020
AV_LOG_WARNING
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:186
AVPixelFormat
AVPixelFormat
Pixel format.
Definition: pixfmt.h:71
name
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf default minimum maximum flags name is the option name
Definition: writing_filters.txt:88
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
AVCodecParameters::codec_type
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:51
AVCodecParameters::color_space
enum AVColorSpace color_space
Definition: codec_par.h:169
avformat_new_stream
AVStream * avformat_new_stream(AVFormatContext *s, const struct AVCodec *c)
Add a new stream to a media file.
VSContext::current_frame
int current_frame
Definition: vapoursynth.c:57
av_pix_fmt_desc_get
const AVPixFmtDescriptor * av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:2965
AVERROR_EOF
#define AVERROR_EOF
End of file.
Definition: error.h:57
AVBufferRef::data
uint8_t * data
The data buffer.
Definition: buffer.h:90
ff_vapoursynth_demuxer
const FFInputFormat ff_vapoursynth_demuxer
Definition: vapoursynth.c:485
AV_PIX_FMT_FLAG_FLOAT
#define AV_PIX_FMT_FLAG_FLOAT
The pixel format contains IEEE-754 floating point values.
Definition: pixdesc.h:158
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
AVCOL_RANGE_JPEG
@ AVCOL_RANGE_JPEG
Full range content.
Definition: pixfmt.h:686
AVPacket::data
uint8_t * data
Definition: packet.h:520
AVOption
AVOption.
Definition: opt.h:357
vsframe_ref_data::vss_state
AVBufferRef * vss_state
Definition: vapoursynth.c:321
data
const char data[16]
Definition: mxf.c:148
av_pix_fmt_desc_next
const AVPixFmtDescriptor * av_pix_fmt_desc_next(const AVPixFmtDescriptor *prev)
Iterate over all pixel format descriptors known to libavutil.
Definition: pixdesc.c:2972
AV_LOG_VERBOSE
#define AV_LOG_VERBOSE
Detailed information.
Definition: log.h:196
OFFSET
#define OFFSET(x)
Definition: vapoursynth.c:65
FFMAX
#define FFMAX(a, b)
Definition: macros.h:47
av_buffer_ref
AVBufferRef * av_buffer_ref(const AVBufferRef *buf)
Create a new reference to an AVBuffer.
Definition: buffer.c:103
get_vs_prop_int
static int get_vs_prop_int(AVFormatContext *s, const VSMap *map, const char *name, int def)
Definition: vapoursynth.c:308
avio_size
int64_t avio_size(AVIOContext *s)
Get the filesize.
Definition: aviobuf.c:323
free_vss_state
static void free_vss_state(void *opaque, uint8_t *data)
Definition: vapoursynth.c:73
av_malloc
#define av_malloc(s)
Definition: tableprint_vlc.h:30
av_pix_fmt_count_planes
int av_pix_fmt_count_planes(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:3005
VSContext::outnode
VSNodeRef * outnode
Definition: vapoursynth.c:55
avpriv_set_pts_info
void avpriv_set_pts_info(AVStream *st, int pts_wrap_bits, unsigned int pts_num, unsigned int pts_den)
Set the time base and wrapping info for a given stream.
Definition: avformat.c:853
class_vs
static const AVClass class_vs
Definition: vapoursynth.c:478
VSContext::vscore
VSCore * vscore
Definition: vapoursynth.c:53
read_seek
static int read_seek(AVFormatContext *ctx, int stream_index, int64_t timestamp, int flags)
Definition: libcdio.c:151
AV_PIX_FMT_FLAG_HWACCEL
#define AV_PIX_FMT_FLAG_HWACCEL
Pixel format is an HW accelerated format.
Definition: pixdesc.h:128
dummy
int dummy
Definition: motion.c:66
read_close
static av_cold int read_close(AVFormatContext *ctx)
Definition: libcdio.c:143
AVERROR_BUFFER_TOO_SMALL
#define AVERROR_BUFFER_TOO_SMALL
Buffer too small.
Definition: error.h:53
AVStream::duration
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:802
av_frame_alloc
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:148
avassert.h
pkt
AVPacket * pkt
Definition: movenc.c:60
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
read_packet
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_read_callback.c:42
options
static const AVOption options[]
Definition: vapoursynth.c:68
s
#define s(width, name)
Definition: cbs_vp9.c:198
AV_CEIL_RSHIFT
#define AV_CEIL_RSHIFT(a, b)
Definition: common.h:60
AV_BUFFER_FLAG_READONLY
#define AV_BUFFER_FLAG_READONLY
Always treat the buffer as read-only, even when it has only one reference.
Definition: buffer.h:114
AVInputFormat::name
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:553
AVCodecParameters::width
int width
Video only.
Definition: codec_par.h:134
info
MIPS optimizations info
Definition: mips.txt:2
vsframe_ref_data::vsapi
const VSAPI * vsapi
Definition: vapoursynth.c:319
AV_OPT_TYPE_INT64
@ AV_OPT_TYPE_INT64
Definition: opt.h:246
av_assert0
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:40
VSContext::max_script_size
int64_t max_script_size
Definition: vapoursynth.c:62
read_header_vs
static av_cold int read_header_vs(AVFormatContext *s)
Definition: vapoursynth.c:171
AV_PIX_FMT_FLAG_ALPHA
#define AV_PIX_FMT_FLAG_ALPHA
The pixel format has an alpha channel.
Definition: pixdesc.h:147
limits.h
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
AV_CODEC_ID_WRAPPED_AVFRAME
@ AV_CODEC_ID_WRAPPED_AVFRAME
Passthrough codec, AVFrames wrapped in AVPacket.
Definition: codec_id.h:601
FF_INFMT_FLAG_INIT_CLEANUP
#define FF_INFMT_FLAG_INIT_CLEANUP
For an FFInputFormat with this flag set read_close() needs to be called by the caller upon read_heade...
Definition: demux.h:35
AVFormatContext
Format I/O context.
Definition: avformat.h:1255
internal.h
AVPacket::buf
AVBufferRef * buf
A reference to the reference-counted buffer where the packet data is stored.
Definition: packet.h:503
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:766
LIBAVUTIL_VERSION_INT
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
read_header
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:550
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:66
NULL
#define NULL
Definition: coverity.c:32
VSContext::c_order
int c_order[4]
Definition: vapoursynth.c:59
AVERROR_PATCHWELCOME
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:64
av_buffer_unref
void av_buffer_unref(AVBufferRef **buf)
Free a given reference and automatically free the buffer if there are no more references to it.
Definition: buffer.c:139
AVComponentDescriptor
Definition: pixdesc.h:30
AVPixFmtDescriptor::nb_components
uint8_t nb_components
The number of components each pixel has, (1-4)
Definition: pixdesc.h:71
AVFMTCTX_UNSEEKABLE
#define AVFMTCTX_UNSEEKABLE
signal that the stream is definitely not seekable, and attempts to call the seek function will fail.
Definition: avformat.h:1208
av_default_item_name
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:237
AVProbeData
This structure contains the data a format has to probe a file.
Definition: avformat.h:451
VSContext::vsapi
const VSAPI * vsapi
Definition: vapoursynth.c:52
AVCOL_SPC_YCGCO
@ AVCOL_SPC_YCGCO
used by Dirac / VC-2 and H.264 FRext, see ITU-T SG16
Definition: pixfmt.h:618
read_seek_vs
static int read_seek_vs(AVFormatContext *s, int stream_idx, int64_t ts, int flags)
Definition: vapoursynth.c:460
AVPixFmtDescriptor::flags
uint64_t flags
Combination of AV_PIX_FMT_FLAG_...
Definition: pixdesc.h:94
is_native_endian
static av_cold int is_native_endian(enum AVPixelFormat pixfmt)
Definition: vapoursynth.c:99
c
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
Definition: undefined.txt:32
av_buffer_create
AVBufferRef * av_buffer_create(uint8_t *data, size_t size, void(*free)(void *opaque, uint8_t *data), void *opaque, int flags)
Create an AVBuffer from an existing array.
Definition: buffer.c:55
VSState::vss
VSScript * vss
Definition: vapoursynth.c:44
eval.h
AVIOContext
Bytestream IO Context.
Definition: avio.h:160
AVPacket::size
int size
Definition: packet.h:521
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
AV_PIX_FMT_FLAG_RGB
#define AV_PIX_FMT_FLAG_RGB
The pixel format contains RGB-like data (as opposed to YUV/grayscale).
Definition: pixdesc.h:136
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
VSContext::vss_state
AVBufferRef * vss_state
Definition: vapoursynth.c:50
frame.h
FFInputFormat::p
AVInputFormat p
The public AVInputFormat.
Definition: demux.h:41
read_close_vs
static av_cold int read_close_vs(AVFormatContext *s)
Definition: vapoursynth.c:83
AVERROR_EXTERNAL
#define AVERROR_EXTERNAL
Generic error in an external library.
Definition: error.h:59
av_pix_fmt_desc_get_id
enum AVPixelFormat av_pix_fmt_desc_get_id(const AVPixFmtDescriptor *desc)
Definition: pixdesc.c:2984
AVPacket::flags
int flags
A combination of AV_PKT_FLAG values.
Definition: packet.h:526
AVBufferRef::size
size_t size
Size of data in bytes.
Definition: buffer.h:94
AV_PIX_FMT_FLAG_BAYER
#define AV_PIX_FMT_FLAG_BAYER
The pixel format is following a Bayer pattern.
Definition: pixdesc.h:152
free_frame
static void free_frame(void *opaque, uint8_t *data)
Definition: vapoursynth.c:301
VSContext::is_cfr
int is_cfr
Definition: vapoursynth.c:56
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:256
AVPacket::pts
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: packet.h:513
read_packet_vs
static int read_packet_vs(AVFormatContext *s, AVPacket *pkt)
Definition: vapoursynth.c:336
AVCodecParameters::height
int height
Definition: codec_par.h:135
AV_TIME_BASE
#define AV_TIME_BASE
Internal time base represented as integer.
Definition: avutil.h:254
FFMIN
#define FFMIN(a, b)
Definition: macros.h:49
AV_PIX_FMT_FLAG_BE
#define AV_PIX_FMT_FLAG_BE
Pixel format is big-endian.
Definition: pixdesc.h:116
av_mallocz
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:256
VSContext
Definition: vapoursynth.c:47
demux.h
match_pixfmt
static av_cold enum AVPixelFormat match_pixfmt(const VSFormat *vsf, int c_order[4])
Definition: vapoursynth.c:109
AVStream
Stream structure.
Definition: avformat.h:743
pixfmt
enum AVPixelFormat pixfmt
Definition: kmsgrab.c:367
AVClass::class_name
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
Definition: log.h:71
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
avformat.h
A
#define A
Definition: vapoursynth.c:66
probe_vs
static av_cold int probe_vs(const AVProbeData *p)
Definition: vapoursynth.c:471
AV_PIX_FMT_FLAG_XYZ
#define AV_PIX_FMT_FLAG_XYZ
The pixel format contains XYZ-like data (as opposed to YUV/RGB/grayscale).
Definition: pixdesc.h:163
AV_PIX_FMT_NONE
@ AV_PIX_FMT_NONE
Definition: pixfmt.h:72
avio_read
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:612
vsframe_ref_data
Definition: vapoursynth.c:318
AVPixFmtDescriptor::comp
AVComponentDescriptor comp[4]
Parameters that describe how pixels are packed.
Definition: pixdesc.h:105
desc
const char * desc
Definition: libsvtav1.c:79
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
read_probe
static int read_probe(const AVProbeData *p)
Definition: cdg.c:30
D
#define D
Definition: vapoursynth.c:67
mem.h
AVBufferRef
A reference to a data buffer.
Definition: buffer.h:82
AVCodecParameters::format
int format
Definition: codec_par.h:92
AVPixFmtDescriptor
Descriptor that unambiguously describes how the bits of a pixel are stored in the up to 4 data planes...
Definition: pixdesc.h:69
map
const VDPAUPixFmtMap * map
Definition: hwcontext_vdpau.c:71
av_free
#define av_free(p)
Definition: tableprint_vlc.h:33
AVCodecParameters::codec_id
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:55
AVPacket
This structure stores compressed data.
Definition: packet.h:497
vsframe_ref_data::frame
const VSFrameRef * frame
Definition: vapoursynth.c:320
FFInputFormat
Definition: demux.h:37
d
d
Definition: ffmpeg_filter.c:424
imgutils.h
flags
#define flags(name, subs,...)
Definition: cbs_av1.c:474
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:27
avstring.h
AV_PKT_FLAG_TRUSTED
#define AV_PKT_FLAG_TRUSTED
The packet comes from a trusted source.
Definition: packet.h:589
VSState
Definition: vapoursynth.c:43
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
free_vsframe_ref
static void free_vsframe_ref(void *opaque, uint8_t *data)
Definition: vapoursynth.c:324
av_get_pix_fmt_name
const char * av_get_pix_fmt_name(enum AVPixelFormat pix_fmt)
Return the short name for a pixel format, NULL in case pix_fmt is unknown.
Definition: pixdesc.c:2885