FFmpeg
nuv.c
Go to the documentation of this file.
1 /*
2  * NuppelVideo decoder
3  * Copyright (c) 2006 Reimar Doeffinger
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 #include <stdio.h>
23 #include <stdlib.h>
24 #include <limits.h>
25 
26 #include "libavutil/bswap.h"
27 #include "libavutil/common.h"
28 #include "libavutil/intreadwrite.h"
29 #include "libavutil/lzo.h"
30 #include "libavutil/imgutils.h"
31 #include "avcodec.h"
32 #include "idctdsp.h"
33 #include "internal.h"
34 #include "rtjpeg.h"
35 
36 typedef struct NuvContext {
37  AVFrame *pic;
38  int codec_frameheader;
39  int quality;
40  int width, height;
41  unsigned int decomp_size;
42  unsigned char *decomp_buf;
43  uint32_t lq[64], cq[64];
44  RTJpegContext rtj;
45 } NuvContext;
46 
47 static const uint8_t fallback_lquant[] = {
48  16, 11, 10, 16, 24, 40, 51, 61,
49  12, 12, 14, 19, 26, 58, 60, 55,
50  14, 13, 16, 24, 40, 57, 69, 56,
51  14, 17, 22, 29, 51, 87, 80, 62,
52  18, 22, 37, 56, 68, 109, 103, 77,
53  24, 35, 55, 64, 81, 104, 113, 92,
54  49, 64, 78, 87, 103, 121, 120, 101,
55  72, 92, 95, 98, 112, 100, 103, 99
56 };
57 
58 static const uint8_t fallback_cquant[] = {
59  17, 18, 24, 47, 99, 99, 99, 99,
60  18, 21, 26, 66, 99, 99, 99, 99,
61  24, 26, 56, 99, 99, 99, 99, 99,
62  47, 66, 99, 99, 99, 99, 99, 99,
63  99, 99, 99, 99, 99, 99, 99, 99,
64  99, 99, 99, 99, 99, 99, 99, 99,
65  99, 99, 99, 99, 99, 99, 99, 99,
66  99, 99, 99, 99, 99, 99, 99, 99
67 };
68 
69 /**
70  * @brief copy frame data from buffer to AVFrame, handling stride.
71  * @param f destination AVFrame
72  * @param src source buffer, does not use any line-stride
73  * @param width width of the video frame
74  * @param height height of the video frame
75  */
76 static void copy_frame(AVFrame *f, const uint8_t *src, int width, int height)
77 {
78  uint8_t *src_data[4];
79  int src_linesize[4];
80  av_image_fill_arrays(src_data, src_linesize, src,
81  f->format, width, height, 1);
82  av_image_copy(f->data, f->linesize, (const uint8_t **)src_data, src_linesize,
83  f->format, width, height);
84 }
85 
86 /**
87  * @brief extract quantization tables from codec data into our context
88  */
89 static int get_quant(AVCodecContext *avctx, NuvContext *c, const uint8_t *buf,
90  int size)
91 {
92  int i;
93  if (size < 2 * 64 * 4) {
94  av_log(avctx, AV_LOG_ERROR, "insufficient rtjpeg quant data\n");
95  return AVERROR_INVALIDDATA;
96  }
97  for (i = 0; i < 64; i++, buf += 4)
98  c->lq[i] = AV_RL32(buf);
99  for (i = 0; i < 64; i++, buf += 4)
100  c->cq[i] = AV_RL32(buf);
101  return 0;
102 }
103 
104 /**
105  * @brief set quantization tables from a quality value
106  */
107 static void get_quant_quality(NuvContext *c, int quality)
108 {
109  int i;
110  quality = FFMAX(quality, 1);
111  for (i = 0; i < 64; i++) {
112  c->lq[i] = (fallback_lquant[i] << 7) / quality;
113  c->cq[i] = (fallback_cquant[i] << 7) / quality;
114  }
115 }
116 
117 static int codec_reinit(AVCodecContext *avctx, int width, int height,
118  int quality)
119 {
120  NuvContext *c = avctx->priv_data;
121  int ret;
122 
123  width = FFALIGN(width, 2);
124  height = FFALIGN(height, 2);
125  if (quality >= 0)
126  get_quant_quality(c, quality);
127  if (width != c->width || height != c->height) {
128  // also reserve space for a possible additional header
129  int64_t buf_size = height * (int64_t)width * 3 / 2
130  + FFMAX(AV_LZO_OUTPUT_PADDING, AV_INPUT_BUFFER_PADDING_SIZE)
131  + RTJPEG_HEADER_SIZE;
132  if (buf_size > INT_MAX/8)
133  return -1;
134  if ((ret = ff_set_dimensions(avctx, width, height)) < 0)
135  return ret;
136  c->width = width;
137  c->height = height;
138  av_fast_malloc(&c->decomp_buf, &c->decomp_size,
139  buf_size);
140  if (!c->decomp_buf) {
141  av_log(avctx, AV_LOG_ERROR,
142  "Can't allocate decompression buffer.\n");
143  return AVERROR(ENOMEM);
144  }
145  ff_rtjpeg_decode_init(&c->rtj, c->width, c->height, c->lq, c->cq);
146  av_frame_unref(c->pic);
147  return 1;
148  } else if (quality != c->quality)
149  ff_rtjpeg_decode_init(&c->rtj, c->width, c->height, c->lq, c->cq);
150 
151  return 0;
152 }
153 
154 static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
155  AVPacket *avpkt)
156 {
157  const uint8_t *buf = avpkt->data;
158  int buf_size = avpkt->size;
159  NuvContext *c = avctx->priv_data;
160  AVFrame *picture = data;
161  int orig_size = buf_size;
162  int keyframe, ret;
163  int size_change = 0;
164  int minsize = 0;
165  int flags = 0;
166  int result, init_frame = !avctx->frame_number;
167  enum {
168  NUV_UNCOMPRESSED = '0',
169  NUV_RTJPEG = '1',
170  NUV_RTJPEG_IN_LZO = '2',
171  NUV_LZO = '3',
172  NUV_BLACK = 'N',
173  NUV_COPY_LAST = 'L'
174  } comptype;
175 
176  if (buf_size < 12) {
177  av_log(avctx, AV_LOG_ERROR, "coded frame too small\n");
178  return AVERROR_INVALIDDATA;
179  }
180 
181  // codec data (rtjpeg quant tables)
182  if (buf[0] == 'D' && buf[1] == 'R') {
183  int ret;
184  // Skip the rest of the frame header.
185  buf = &buf[12];
186  buf_size -= 12;
187  ret = get_quant(avctx, c, buf, buf_size);
188  if (ret < 0)
189  return ret;
190  ff_rtjpeg_decode_init(&c->rtj, c->width, c->height, c->lq, c->cq);
191  return orig_size;
192  }
193 
194  if (buf_size < 12 || buf[0] != 'V') {
195  av_log(avctx, AV_LOG_ERROR, "not a nuv video frame\n");
196  return AVERROR_INVALIDDATA;
197  }
198  comptype = buf[1];
199  switch (comptype) {
200  case NUV_RTJPEG_IN_LZO:
201  case NUV_RTJPEG:
202  keyframe = !buf[2];
203  if (c->width < 16 || c->height < 16) {
204  return AVERROR_INVALIDDATA;
205  }
206  break;
207  case NUV_COPY_LAST:
208  flags |= FF_REGET_BUFFER_FLAG_READONLY;
209  keyframe = 0;
210  break;
211  default:
212  keyframe = 1;
213  break;
214  }
215  switch (comptype) {
216  case NUV_UNCOMPRESSED:
217  minsize = c->width * c->height * 3 / 2;
218  break;
219  case NUV_RTJPEG:
220  minsize = c->width/16 * (c->height/16) * 6;
221  break;
222  case NUV_BLACK:
223  case NUV_COPY_LAST:
224  case NUV_LZO:
225  case NUV_RTJPEG_IN_LZO:
226  break;
227  default:
228  av_log(avctx, AV_LOG_ERROR, "unknown compression\n");
229  return AVERROR_INVALIDDATA;
230  }
231  if (buf_size < minsize / 4)
232  return AVERROR_INVALIDDATA;
233 retry:
234  // Skip the rest of the frame header.
235  buf = &buf[12];
236  buf_size -= 12;
237  if (comptype == NUV_RTJPEG_IN_LZO || comptype == NUV_LZO) {
238  int outlen = c->decomp_size - FFMAX(AV_INPUT_BUFFER_PADDING_SIZE, AV_LZO_OUTPUT_PADDING);
239  int inlen = buf_size;
240  if (av_lzo1x_decode(c->decomp_buf, &outlen, buf, &inlen)) {
241  av_log(avctx, AV_LOG_ERROR, "error during lzo decompression\n");
242  return AVERROR_INVALIDDATA;
243  }
244  buf = c->decomp_buf;
245  buf_size = c->decomp_size - FFMAX(AV_INPUT_BUFFER_PADDING_SIZE, AV_LZO_OUTPUT_PADDING) - outlen;
246  memset(c->decomp_buf + buf_size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
247  }
248  if (c->codec_frameheader) {
249  int w, h, q;
250  if (buf_size < RTJPEG_HEADER_SIZE) {
251  av_log(avctx, AV_LOG_ERROR, "Too small NUV video frame\n");
252  return AVERROR_INVALIDDATA;
253  }
254  // There seem to exist two variants of this header: one starts with 'V'
255  // and 5 bytes unknown, the other matches current MythTV and is 4 bytes size,
256  // 1 byte header size (== 12), 1 byte version (== 0)
257  if (buf[0] != 'V' && AV_RL16(&buf[4]) != 0x000c) {
258  av_log(avctx, AV_LOG_ERROR, "Unknown secondary frame header (wrong codec_tag?)\n");
259  return AVERROR_INVALIDDATA;
260  }
261  w = AV_RL16(&buf[6]);
262  h = AV_RL16(&buf[8]);
263  q = buf[10];
264  if ((result = codec_reinit(avctx, w, h, q)) < 0)
265  return result;
266  if (result) {
267  buf = avpkt->data;
268  buf_size = avpkt->size;
269  size_change = 1;
270  goto retry;
271  }
272  buf = &buf[RTJPEG_HEADER_SIZE];
273  buf_size -= RTJPEG_HEADER_SIZE;
274  }
275 
276  if (size_change || keyframe) {
277  av_frame_unref(c->pic);
278  init_frame = 1;
279  }
280 
281  if ((result = ff_reget_buffer(avctx, c->pic, flags)) < 0)
282  return result;
283  if (init_frame) {
284  memset(c->pic->data[0], 0, avctx->height * c->pic->linesize[0]);
285  memset(c->pic->data[1], 0x80, avctx->height * c->pic->linesize[1] / 2);
286  memset(c->pic->data[2], 0x80, avctx->height * c->pic->linesize[2] / 2);
287  }
288 
289  c->pic->pict_type = keyframe ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
290  c->pic->key_frame = keyframe;
291  // decompress/copy/whatever data
292  switch (comptype) {
293  case NUV_LZO:
294  case NUV_UNCOMPRESSED: {
295  int height = c->height;
296  if (buf_size < c->width * height * 3 / 2) {
297  av_log(avctx, AV_LOG_ERROR, "uncompressed frame too short\n");
298  height = buf_size / c->width / 3 * 2;
299  }
300  if(height > 0)
301  copy_frame(c->pic, buf, c->width, height);
302  break;
303  }
304  case NUV_RTJPEG_IN_LZO:
305  case NUV_RTJPEG:
306  ret = ff_rtjpeg_decode_frame_yuv420(&c->rtj, c->pic, buf, buf_size);
307  if (ret < 0)
308  return ret;
309  break;
310  case NUV_BLACK:
311  memset(c->pic->data[0], 0, c->width * c->height);
312  memset(c->pic->data[1], 128, c->width * c->height / 4);
313  memset(c->pic->data[2], 128, c->width * c->height / 4);
314  break;
315  case NUV_COPY_LAST:
316  /* nothing more to do here */
317  break;
318  }
319 
320  if ((result = av_frame_ref(picture, c->pic)) < 0)
321  return result;
322 
323  *got_frame = 1;
324  return orig_size;
325 }
326 
327 static av_cold int decode_init(AVCodecContext *avctx)
328 {
329  NuvContext *c = avctx->priv_data;
330  int ret;
331 
332  c->pic = av_frame_alloc();
333  if (!c->pic)
334  return AVERROR(ENOMEM);
335 
336  avctx->pix_fmt = AV_PIX_FMT_YUV420P;
337  c->decomp_buf = NULL;
338  c->quality = -1;
339  c->width = 0;
340  c->height = 0;
341 
342  c->codec_frameheader = avctx->codec_tag == MKTAG('R', 'J', 'P', 'G');
343 
344  if (avctx->extradata_size)
345  get_quant(avctx, c, avctx->extradata, avctx->extradata_size);
346 
347  ff_rtjpeg_init(&c->rtj, avctx);
348 
349  if ((ret = codec_reinit(avctx, avctx->width, avctx->height, -1)) < 0)
350  return ret;
351 
352  return 0;
353 }
354 
355 static av_cold int decode_end(AVCodecContext *avctx)
356 {
357  NuvContext *c = avctx->priv_data;
358 
359  av_freep(&c->decomp_buf);
360  av_frame_free(&c->pic);
361 
362  return 0;
363 }
364 
365 const AVCodec ff_nuv_decoder = {
366  .name = "nuv",
367  .long_name = NULL_IF_CONFIG_SMALL("NuppelVideo/RTJPEG"),
368  .type = AVMEDIA_TYPE_VIDEO,
369  .id = AV_CODEC_ID_NUV,
370  .priv_data_size = sizeof(NuvContext),
371  .init = decode_init,
372  .close = decode_end,
373  .decode = decode_frame,
374  .capabilities = AV_CODEC_CAP_DR1,
375  .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP,
376 };
AVCodec
AVCodec.
Definition: codec.h:202
FF_CODEC_CAP_INIT_THREADSAFE
#define FF_CODEC_CAP_INIT_THREADSAFE
The codec does not modify any global variables in the init function, allowing to call the init functi...
Definition: internal.h:42
fallback_cquant
static const uint8_t fallback_cquant[]
Definition: nuv.c:58
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
NuvContext::codec_frameheader
int codec_frameheader
Definition: nuv.c:38
NuvContext::cq
uint32_t cq[64]
Definition: nuv.c:43
av_frame_free
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:109
copy_frame
static void copy_frame(AVFrame *f, const uint8_t *src, int width, int height)
copy frame data from buffer to AVFrame, handling stride.
Definition: nuv.c:76
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:317
w
uint8_t w
Definition: llviddspenc.c:38
NuvContext::width
int width
Definition: nuv.c:40
internal.h
AVPacket::data
uint8_t * data
Definition: packet.h:373
data
const char data[16]
Definition: mxf.c:143
codec_reinit
static int codec_reinit(AVCodecContext *avctx, int width, int height, int quality)
Definition: nuv.c:117
FFMAX
#define FFMAX(a, b)
Definition: macros.h:47
quality
trying all byte sequences megabyte in length and selecting the best looking sequence will yield cases to try But a word about quality
Definition: rate_distortion.txt:12
init
static int init
Definition: av_tx.c:47
RTJPEG_HEADER_SIZE
#define RTJPEG_HEADER_SIZE
Definition: rtjpeg.h:31
NuvContext::quality
int quality
Definition: nuv.c:39
av_frame_alloc
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:97
ff_rtjpeg_decode_init
void ff_rtjpeg_decode_init(RTJpegContext *c, int width, int height, const uint32_t *lquant, const uint32_t *cquant)
initialize an RTJpegContext, may be called multiple times
Definition: rtjpeg.c:158
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
decode
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
Definition: decode_audio.c:71
AVCodecContext::extradata_size
int extradata_size
Definition: avcodec.h:485
width
#define width
intreadwrite.h
AV_CODEC_ID_NUV
@ AV_CODEC_ID_NUV
Definition: codec_id.h:134
NuvContext
Definition: nuv.c:36
get_quant
static int get_quant(AVCodecContext *avctx, NuvContext *c, const uint8_t *buf, int size)
extract quantization tables from codec data into our context
Definition: nuv.c:89
limits.h
AV_RL16
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_RL16
Definition: bytestream.h:94
NuvContext::decomp_buf
unsigned char * decomp_buf
Definition: nuv.c:42
AV_PIX_FMT_YUV420P
@ AV_PIX_FMT_YUV420P
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:66
f
#define f(width, name)
Definition: cbs_vp9.c:255
ff_nuv_decoder
const AVCodec ff_nuv_decoder
Definition: nuv.c:365
result
and forward the result(frame or status change) to the corresponding input. If nothing is possible
NULL
#define NULL
Definition: coverity.c:32
AV_PICTURE_TYPE_I
@ AV_PICTURE_TYPE_I
Intra.
Definition: avutil.h:274
src
#define src
Definition: vp8dsp.c:255
ff_rtjpeg_decode_frame_yuv420
int ff_rtjpeg_decode_frame_yuv420(RTJpegContext *c, AVFrame *f, const uint8_t *buf, int buf_size)
decode one rtjpeg YUV420 frame
Definition: rtjpeg.c:106
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
decode_end
static av_cold int decode_end(AVCodecContext *avctx)
Definition: nuv.c:355
av_lzo1x_decode
int av_lzo1x_decode(void *out, int *outlen, const void *in, int *inlen)
Decodes LZO 1x compressed data.
Definition: lzo.c:134
AV_CODEC_CAP_DR1
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() or get_encode_buffer() for allocating buffers and supports custom allocators.
Definition: codec.h:52
AVPacket::size
int size
Definition: packet.h:374
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
av_image_fill_arrays
int av_image_fill_arrays(uint8_t *dst_data[4], int dst_linesize[4], const uint8_t *src, enum AVPixelFormat pix_fmt, int width, int height, int align)
Setup the data pointers and linesizes based on the specified image parameters and the provided array.
Definition: imgutils.c:446
av_frame_ref
int av_frame_ref(AVFrame *dst, const AVFrame *src)
Set up a new reference to the data described by the source frame.
Definition: frame.c:325
size
int size
Definition: twinvq_data.h:10344
ff_rtjpeg_init
void ff_rtjpeg_init(RTJpegContext *c, AVCodecContext *avctx)
Definition: rtjpeg.c:170
get_quant_quality
static void get_quant_quality(NuvContext *c, int quality)
set quantization tables from a quality value
Definition: nuv.c:107
height
#define height
NuvContext::decomp_size
unsigned int decomp_size
Definition: nuv.c:41
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:271
AV_LZO_OUTPUT_PADDING
#define AV_LZO_OUTPUT_PADDING
Definition: lzo.h:47
AVCodecContext::extradata
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:484
FF_CODEC_CAP_INIT_CLEANUP
#define FF_CODEC_CAP_INIT_CLEANUP
The codec allows calling the close function for deallocation even if the init function returned a fai...
Definition: internal.h:50
common.h
av_frame_unref
void av_frame_unref(AVFrame *frame)
Unreference all the buffers referenced by frame and reset the frame fields.
Definition: frame.c:435
AVCodec::name
const char * name
Name of the codec implementation.
Definition: codec.h:209
AVCodecContext::height
int height
Definition: avcodec.h:556
AVCodecContext::pix_fmt
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:593
NuvContext::lq
uint32_t lq[64]
Definition: nuv.c:43
idctdsp.h
avcodec.h
ff_reget_buffer
int ff_reget_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Identical in function to ff_get_buffer(), except it reuses the existing buffer if available.
Definition: decode.c:1759
ret
ret
Definition: filter_design.txt:187
bswap.h
FF_REGET_BUFFER_FLAG_READONLY
#define FF_REGET_BUFFER_FLAG_READONLY
the returned buffer does not need to be writable
Definition: internal.h:277
NuvContext::pic
AVFrame * pic
Definition: nuv.c:37
lzo.h
AV_INPUT_BUFFER_PADDING_SIZE
#define AV_INPUT_BUFFER_PADDING_SIZE
Definition: defs.h:40
AV_RL32
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:92
AVCodecContext
main external API structure.
Definition: avcodec.h:383
av_image_copy
void av_image_copy(uint8_t *dst_data[4], int dst_linesizes[4], const uint8_t *src_data[4], const int src_linesizes[4], enum AVPixelFormat pix_fmt, int width, int height)
Copy image in src_data to dst_data.
Definition: imgutils.c:422
fallback_lquant
static const uint8_t fallback_lquant[]
Definition: nuv.c:47
rtjpeg.h
NuvContext::rtj
RTJpegContext rtj
Definition: nuv.c:44
init_frame
static void init_frame(FlacEncodeContext *s, int nb_samples)
Definition: flacenc.c:436
AV_PICTURE_TYPE_P
@ AV_PICTURE_TYPE_P
Predicted.
Definition: avutil.h:275
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
ff_set_dimensions
int ff_set_dimensions(AVCodecContext *s, int width, int height)
Check that the provided frame dimensions are valid and set them on the codec context.
Definition: utils.c:86
AVCodecContext::frame_number
int frame_number
Frame counter, set by libavcodec.
Definition: avcodec.h:1023
AVCodecContext::codec_tag
unsigned int codec_tag
fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
Definition: avcodec.h:408
FFALIGN
#define FFALIGN(x, a)
Definition: macros.h:78
AVPacket
This structure stores compressed data.
Definition: packet.h:350
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:410
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:35
av_fast_malloc
void av_fast_malloc(void *ptr, unsigned int *size, size_t min_size)
Allocate a buffer, reusing the given one if large enough.
Definition: mem.c:560
decode_init
static av_cold int decode_init(AVCodecContext *avctx)
Definition: nuv.c:327
AVCodecContext::width
int width
picture width / height.
Definition: avcodec.h:556
imgutils.h
flags
#define flags(name, subs,...)
Definition: cbs_av1.c:561
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28
NuvContext::height
int height
Definition: nuv.c:40
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:61
MKTAG
#define MKTAG(a, b, c, d)
Definition: macros.h:55
h
h
Definition: vp9dsp_template.c:2038
RTJpegContext
Definition: rtjpeg.h:33
decode_frame
static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: nuv.c:154
Generated on Wed Aug 24 2022 21:37:49 for FFmpeg by   doxygen 1.8.17