FFmpeg
imm4.c
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1 /*
2  * Infinity IMM4 decoder
3  *
4  * Copyright (c) 2018 Paul B Mahol
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 #include <stdio.h>
24 #include <stdlib.h>
25 #include <string.h>
26 
27 #include "libavutil/thread.h"
28 
29 #include "avcodec.h"
30 #include "bswapdsp.h"
31 #include "copy_block.h"
32 #include "get_bits.h"
33 #include "idctdsp.h"
34 #include "internal.h"
35 
36 typedef struct IMM4Context {
39 
43 
44  int factor;
45  unsigned lo;
46  unsigned hi;
47 
49  DECLARE_ALIGNED(32, int16_t, block)[6][64];
51 } IMM4Context;
52 
53 static const uint8_t intra_cb[] = {
54  24, 18, 12
55 };
56 
57 static const uint8_t inter_cb[] = {
58  30, 20, 15
59 };
60 
61 static const uint8_t cbplo_symbols[] = {
62  3, 4, 19, 20, 35, 36, 51, 52
63 };
64 
65 static const uint8_t cbplo_bits[] = {
66  1, 4, 3, 6, 3, 6, 3, 6
67 };
68 
69 static const uint8_t cbplo_codes[] = {
70  1, 1, 1, 1, 2, 2, 3, 3
71 };
72 
73 static const uint8_t cbphi_bits[] = {
74  4, 5, 5, 4, 5, 4, 6, 4, 5, 6, 4, 4, 4, 4, 4, 2
75 };
76 
77 static const uint8_t cbphi_codes[] = {
78  3, 5, 4, 9, 3, 7, 2, 11, 2, 3, 5, 10, 4, 8, 6, 3
79 };
80 
81 static const uint8_t blktype_symbols[] = {
82  0, 1, 2, 3, 4, 16, 17, 18, 19, 20, 32, 33, 34, 35, 48, 50, 51, 52
83 };
84 
85 static const uint8_t blktype_bits[] = {
86  1, 3, 3, 5, 6, 4, 7, 7, 8, 9, 4, 7, 7, 8, 6, 8, 7, 9
87 };
88 
89 static const uint8_t blktype_codes[] = {
90  1, 3, 2, 3, 4, 3, 7, 5, 4, 4, 2, 6, 4, 3, 5, 5, 3, 2
91 };
92 
93 static const uint16_t block_symbols[] = {
94  0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7, 0x8, 0x9, 0xA, 0xB, 0xC, 0x81, 0x82, 0x83,
95  0x84, 0x85, 0x86, 0x101, 0x102, 0x103, 0x104, 0x181, 0x182, 0x183, 0x201, 0x202,
96  0x203, 0x281, 0x282, 0x283, 0x301, 0x302, 0x303, 0x381, 0x382, 0x401, 0x402,
97  0x481, 0x482, 0x501, 0x502, 0x581, 0x601, 0x681, 0x701, 0x781, 0x801, 0x881,
98  0x901, 0x981, 0xA01, 0xA81, 0xB01, 0xB81, 0xC01, 0xC81, 0xD01, 0x4001, 0x4002,
99  0x4003, 0x4081, 0x4082, 0x4101, 0x4181, 0x4201, 0x4281, 0x4301, 0x4381, 0x4401,
100  0x4481, 0x4501, 0x4581, 0x4601, 0x4681, 0x4701, 0x4781, 0x4801, 0x4881, 0x4901,
101  0x4981, 0x4A01, 0x4A81, 0x4B01, 0x4B81, 0x4C01, 0x4C81, 0x4D01, 0x4D81, 0x4E01,
102  0x4E81, 0x4F01, 0x4F81, 0x5001, 0x5081, 0x5101, 0x5181, 0x5201, 0x5281, 0x5301,
103  0x5381, 0x5401
104 };
105 
106 static const uint8_t block_bits[] = {
107  7, 2, 4, 6, 7, 8, 9, 9, 10, 10, 11, 11, 11, 3, 6, 8, 10, 11, 12, 4, 8,
108  10, 12, 5, 9, 10, 5, 9, 12, 5, 10, 12, 6, 10, 12, 6, 10, 6, 10, 6,
109  10, 7, 12, 7, 7, 8, 8, 9, 9, 9, 9, 9, 9, 9, 9, 11, 11, 12, 12, 4, 9,
110  11, 6, 11, 6, 6, 6, 7, 7, 7, 7, 8, 8, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9,
111  9, 9, 9, 9, 10, 10, 10, 10, 11, 11, 11, 11, 12, 12, 12, 12, 12, 12,
112  12, 12
113 };
114 
115 static const uint8_t block_codes[] = {
116  3, 2, 15, 21, 23, 31, 37, 36, 33, 32, 7, 6, 32, 6, 20, 30, 15, 33, 80,
117  14, 29, 14, 81, 13, 35, 13, 12, 34, 82, 11, 12, 83, 19, 11, 84, 18,
118  10, 17, 9, 16, 8, 22, 85, 21, 20, 28, 27, 33, 32, 31, 30, 29, 28,
119  27, 26, 34, 35, 86, 87, 7, 25, 5, 15, 4, 14, 13, 12, 19, 18, 17, 16,
120  26, 25, 24, 23, 22, 21, 20, 19, 24, 23, 22, 21, 20, 19, 18, 17, 7,
121  6, 5, 4, 36, 37, 38, 39, 88, 89, 90, 91, 92, 93, 94, 95
122 };
123 
124 static VLC cbplo_tab;
125 static VLC cbphi_tab;
127 static VLC block_tab;
128 
129 static int get_cbphi(GetBitContext *gb, int x)
130 {
131  int value;
132 
133  value = get_vlc2(gb, cbphi_tab.table, cbphi_tab.bits, 1);
134  if (value < 0)
135  return AVERROR_INVALIDDATA;
136 
137  return x ? value : 15 - value;
138 }
139 
141  int block, int factor, int flag, int offset, int flag2)
142 {
143  IMM4Context *s = avctx->priv_data;
144  const uint8_t *scantable = s->intra_scantable.permutated;
145  int i, last, len, factor2;
146 
147  for (i = !flag; i < 64; i++) {
148  int value;
149 
150  value = get_vlc2(gb, block_tab.table, block_tab.bits, 1);
151  if (value < 0)
152  return AVERROR_INVALIDDATA;
153  if (value == 0) {
154  last = get_bits1(gb);
155  len = get_bits(gb, 6);
156  factor2 = get_sbits(gb, 8);
157  } else {
158  factor2 = value & 0x7F;
159  last = (value >> 14) & 1;
160  len = (value >> 7) & 0x3F;
161  if (get_bits1(gb))
162  factor2 = -factor2;
163  }
164  i += len;
165  if (i >= 64)
166  break;
167  s->block[block][scantable[i]] = offset * (factor2 < 0 ? -1 : 1) + factor * factor2;
168  if (last)
169  break;
170  }
171 
172  if (s->hi == 2 && flag2 && block < 4) {
173  if (flag)
174  s->block[block][scantable[0]] *= 2;
175  s->block[block][scantable[1]] *= 2;
176  s->block[block][scantable[8]] *= 2;
177  s->block[block][scantable[16]] *= 2;
178  }
179 
180  return 0;
181 }
182 
184  unsigned cbp, int flag, int offset, unsigned flag2)
185 {
186  IMM4Context *s = avctx->priv_data;
187  const uint8_t *scantable = s->intra_scantable.permutated;
188  int ret, i;
189 
190  memset(s->block, 0, sizeof(s->block));
191 
192  for (i = 0; i < 6; i++) {
193  if (!flag) {
194  int x = get_bits(gb, 8);
195 
196  if (x == 255)
197  x = 128;
198  x *= 8;
199 
200  s->block[i][scantable[0]] = x;
201  }
202 
203  if (cbp & (1 << (5 - i))) {
204  ret = decode_block(avctx, gb, i, s->factor, flag, offset, flag2);
205  if (ret < 0)
206  return ret;
207  }
208  }
209 
210  return 0;
211 }
212 
214 {
215  IMM4Context *s = avctx->priv_data;
216  int ret, x, y, offset = 0;
217 
218  if (s->hi == 0) {
219  if (s->lo > 2)
220  return AVERROR_INVALIDDATA;
221  s->factor = intra_cb[s->lo];
222  } else {
223  s->factor = s->lo * 2;
224  }
225 
226  if (s->hi) {
227  offset = s->factor;
228  offset >>= 1;
229  if (!(offset & 1))
230  offset--;
231  }
232 
233  for (y = 0; y < avctx->height; y += 16) {
234  for (x = 0; x < avctx->width; x += 16) {
235  unsigned flag, cbphi, cbplo;
236 
237  cbplo = get_vlc2(gb, cbplo_tab.table, cbplo_tab.bits, 1) >> 4;
238  flag = get_bits1(gb);
239 
240  cbphi = get_cbphi(gb, 1);
241 
242  ret = decode_blocks(avctx, gb, cbplo | (cbphi << 2), 0, offset, flag);
243  if (ret < 0)
244  return ret;
245 
246  s->idsp.idct_put(frame->data[0] + y * frame->linesize[0] + x,
247  frame->linesize[0], s->block[0]);
248  s->idsp.idct_put(frame->data[0] + y * frame->linesize[0] + x + 8,
249  frame->linesize[0], s->block[1]);
250  s->idsp.idct_put(frame->data[0] + (y + 8) * frame->linesize[0] + x,
251  frame->linesize[0], s->block[2]);
252  s->idsp.idct_put(frame->data[0] + (y + 8) * frame->linesize[0] + x + 8,
253  frame->linesize[0], s->block[3]);
254  s->idsp.idct_put(frame->data[1] + (y >> 1) * frame->linesize[1] + (x >> 1),
255  frame->linesize[1], s->block[4]);
256  s->idsp.idct_put(frame->data[2] + (y >> 1) * frame->linesize[2] + (x >> 1),
257  frame->linesize[2], s->block[5]);
258  }
259  }
260 
261  return 0;
262 }
263 
265  AVFrame *frame, AVFrame *prev)
266 {
267  IMM4Context *s = avctx->priv_data;
268  int ret, x, y, offset = 0;
269 
270  if (s->hi == 0) {
271  if (s->lo > 2)
272  return AVERROR_INVALIDDATA;
273  s->factor = inter_cb[s->lo];
274  } else {
275  s->factor = s->lo * 2;
276  }
277 
278  if (s->hi) {
279  offset = s->factor;
280  offset >>= 1;
281  if (!(offset & 1))
282  offset--;
283  }
284 
285  for (y = 0; y < avctx->height; y += 16) {
286  for (x = 0; x < avctx->width; x += 16) {
287  int reverse, intra_block, value;
288  unsigned cbphi, cbplo, flag2 = 0;
289 
290  if (get_bits1(gb)) {
291  copy_block16(frame->data[0] + y * frame->linesize[0] + x,
292  prev->data[0] + y * prev->linesize[0] + x,
293  frame->linesize[0], prev->linesize[0], 16);
294  copy_block8(frame->data[1] + (y >> 1) * frame->linesize[1] + (x >> 1),
295  prev->data[1] + (y >> 1) * prev->linesize[1] + (x >> 1),
296  frame->linesize[1], prev->linesize[1], 8);
297  copy_block8(frame->data[2] + (y >> 1) * frame->linesize[2] + (x >> 1),
298  prev->data[2] + (y >> 1) * prev->linesize[2] + (x >> 1),
299  frame->linesize[2], prev->linesize[2], 8);
300  continue;
301  }
302 
303  value = get_vlc2(gb, blktype_tab.table, blktype_tab.bits, 1);
304  if (value < 0)
305  return AVERROR_INVALIDDATA;
306 
307  intra_block = value & 0x07;
308  reverse = intra_block == 3;
309  if (reverse)
310  flag2 = get_bits1(gb);
311 
312  cbplo = value >> 4;
313  cbphi = get_cbphi(gb, reverse);
314  if (intra_block) {
315  ret = decode_blocks(avctx, gb, cbplo | (cbphi << 2), 0, offset, flag2);
316  if (ret < 0)
317  return ret;
318 
319  s->idsp.idct_put(frame->data[0] + y * frame->linesize[0] + x,
320  frame->linesize[0], s->block[0]);
321  s->idsp.idct_put(frame->data[0] + y * frame->linesize[0] + x + 8,
322  frame->linesize[0], s->block[1]);
323  s->idsp.idct_put(frame->data[0] + (y + 8) * frame->linesize[0] + x,
324  frame->linesize[0], s->block[2]);
325  s->idsp.idct_put(frame->data[0] + (y + 8) * frame->linesize[0] + x + 8,
326  frame->linesize[0], s->block[3]);
327  s->idsp.idct_put(frame->data[1] + (y >> 1) * frame->linesize[1] + (x >> 1),
328  frame->linesize[1], s->block[4]);
329  s->idsp.idct_put(frame->data[2] + (y >> 1) * frame->linesize[2] + (x >> 1),
330  frame->linesize[2], s->block[5]);
331  } else {
332  flag2 = get_bits1(gb);
333  skip_bits1(gb);
334  ret = decode_blocks(avctx, gb, cbplo | (cbphi << 2), 1, offset, flag2);
335  if (ret < 0)
336  return ret;
337 
338  copy_block16(frame->data[0] + y * frame->linesize[0] + x,
339  prev->data[0] + y * prev->linesize[0] + x,
340  frame->linesize[0], prev->linesize[0], 16);
341  copy_block8(frame->data[1] + (y >> 1) * frame->linesize[1] + (x >> 1),
342  prev->data[1] + (y >> 1) * prev->linesize[1] + (x >> 1),
343  frame->linesize[1], prev->linesize[1], 8);
344  copy_block8(frame->data[2] + (y >> 1) * frame->linesize[2] + (x >> 1),
345  prev->data[2] + (y >> 1) * prev->linesize[2] + (x >> 1),
346  frame->linesize[2], prev->linesize[2], 8);
347 
348  s->idsp.idct_add(frame->data[0] + y * frame->linesize[0] + x,
349  frame->linesize[0], s->block[0]);
350  s->idsp.idct_add(frame->data[0] + y * frame->linesize[0] + x + 8,
351  frame->linesize[0], s->block[1]);
352  s->idsp.idct_add(frame->data[0] + (y + 8) * frame->linesize[0] + x,
353  frame->linesize[0], s->block[2]);
354  s->idsp.idct_add(frame->data[0] + (y + 8) * frame->linesize[0] + x + 8,
355  frame->linesize[0], s->block[3]);
356  s->idsp.idct_add(frame->data[1] + (y >> 1) * frame->linesize[1] + (x >> 1),
357  frame->linesize[1], s->block[4]);
358  s->idsp.idct_add(frame->data[2] + (y >> 1) * frame->linesize[2] + (x >> 1),
359  frame->linesize[2], s->block[5]);
360  }
361  }
362  }
363 
364  return 0;
365 }
366 
367 static int decode_frame(AVCodecContext *avctx, void *data,
368  int *got_frame, AVPacket *avpkt)
369 {
370  IMM4Context *s = avctx->priv_data;
371  GetBitContext *gb = &s->gb;
372  AVFrame *frame = data;
373  int width, height;
374  unsigned type;
375  int ret, scaled;
376 
377  if (avpkt->size <= 32)
378  return AVERROR_INVALIDDATA;
379 
381  FFALIGN(avpkt->size, 4));
382  if (!s->bitstream)
383  return AVERROR(ENOMEM);
384 
385  s->bdsp.bswap_buf((uint32_t *)s->bitstream,
386  (uint32_t *)avpkt->data,
387  (avpkt->size + 3) >> 2);
388 
389  if ((ret = init_get_bits8(gb, s->bitstream, FFALIGN(avpkt->size, 4))) < 0)
390  return ret;
391 
392  avctx->pix_fmt = AV_PIX_FMT_YUV420P;
393  avctx->color_range = AVCOL_RANGE_JPEG;
394 
395  width = avctx->width;
396  height = avctx->height;
397 
398  scaled = avpkt->data[8];
399  if (scaled < 2) {
400  int mode = avpkt->data[10];
401 
402  switch (mode) {
403  case 1:
404  width = 352;
405  height = 240;
406  break;
407  case 2:
408  width = 704;
409  height = 240;
410  break;
411  case 4:
412  width = 480;
413  height = 704;
414  break;
415  case 17:
416  width = 352;
417  height = 288;
418  break;
419  case 18:
420  width = 704;
421  height = 288;
422  break;
423  default:
424  width = 704;
425  height = 576;
426  break;
427  }
428  }
429 
430  skip_bits_long(gb, 24 * 8);
431  type = get_bits_long(gb, 32);
432  s->hi = get_bits(gb, 16);
433  s->lo = get_bits(gb, 16);
434 
435  switch (type) {
436  case 0x19781977:
437  frame->key_frame = 1;
438  frame->pict_type = AV_PICTURE_TYPE_I;
439  break;
440  case 0x12250926:
441  frame->key_frame = 0;
442  frame->pict_type = AV_PICTURE_TYPE_P;
443  break;
444  default:
445  avpriv_request_sample(avctx, "type %X", type);
446  return AVERROR_PATCHWELCOME;
447  }
448 
449  if (avctx->width != width ||
450  avctx->height != height) {
451  if (!frame->key_frame) {
452  av_log(avctx, AV_LOG_ERROR, "Frame size change is unsupported.\n");
453  return AVERROR_INVALIDDATA;
454  }
456  }
457 
458  ret = ff_set_dimensions(avctx, width, height);
459  if (ret < 0)
460  return ret;
461 
462  if ((ret = ff_get_buffer(avctx, frame, frame->key_frame ? AV_GET_BUFFER_FLAG_REF : 0)) < 0)
463  return ret;
464 
465  if (frame->key_frame) {
466  ret = decode_intra(avctx, gb, frame);
467  if (ret < 0)
468  return ret;
469 
471  if ((ret = av_frame_ref(s->prev_frame, frame)) < 0)
472  return ret;
473  } else {
474  if (!s->prev_frame->data[0]) {
475  av_log(avctx, AV_LOG_ERROR, "Missing reference frame.\n");
476  return AVERROR_INVALIDDATA;
477  }
478 
479  ret = decode_inter(avctx, gb, frame, s->prev_frame);
480  if (ret < 0)
481  return ret;
482  }
483 
484  *got_frame = 1;
485 
486  return avpkt->size;
487 }
488 
490 {
492  cbplo_bits, 1, 1, cbplo_codes, 1, 1, cbplo_symbols, 1, 1, 512);
493 
495  cbphi_bits, 1, 1, cbphi_codes, 1, 1, NULL, 0, 0, 64);
496 
498  blktype_bits, 1, 1, blktype_codes, 1, 1, blktype_symbols, 1, 1, 512);
499 
501  block_bits, 1, 1, block_codes, 1, 1, block_symbols, 2, 2, 4096);
502 }
503 
505 {
506  static AVOnce init_static_once = AV_ONCE_INIT;
507  IMM4Context *s = avctx->priv_data;
508  uint8_t table[64];
509 
510  for (int i = 0; i < 64; i++)
511  table[i] = i;
512 
513  ff_bswapdsp_init(&s->bdsp);
514  ff_idctdsp_init(&s->idsp, avctx);
516 
517  s->prev_frame = av_frame_alloc();
518  if (!s->prev_frame)
519  return AVERROR(ENOMEM);
520 
521  ff_thread_once(&init_static_once, imm4_init_static_data);
522 
523  return 0;
524 }
525 
526 static void decode_flush(AVCodecContext *avctx)
527 {
528  IMM4Context *s = avctx->priv_data;
529 
531 }
532 
534 {
535  IMM4Context *s = avctx->priv_data;
536 
538  av_freep(&s->bitstream);
539  s->bitstream_size = 0;
540 
541  return 0;
542 }
543 
545  .name = "imm4",
546  .long_name = NULL_IF_CONFIG_SMALL("Infinity IMM4"),
547  .type = AVMEDIA_TYPE_VIDEO,
548  .id = AV_CODEC_ID_IMM4,
549  .priv_data_size = sizeof(IMM4Context),
550  .init = decode_init,
551  .close = decode_close,
552  .decode = decode_frame,
553  .flush = decode_flush,
554  .capabilities = AV_CODEC_CAP_DR1,
555  .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE |
557 };
#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:48
#define NULL
Definition: coverity.c:32
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
This structure describes decoded (raw) audio or video data.
Definition: frame.h:295
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:100
static void flush(AVCodecContext *avctx)
static VLC cbplo_tab
Definition: imm4.c:124
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:379
static const uint8_t blktype_bits[]
Definition: imm4.c:85
int16_t block[6][64]
Definition: imm4.c:49
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:104
static void skip_bits_long(GetBitContext *s, int n)
Skips the specified number of bits.
Definition: get_bits.h:291
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
#define avpriv_request_sample(...)
enum AVColorRange color_range
MPEG vs JPEG YUV range.
Definition: avcodec.h:2200
Scantable.
Definition: idctdsp.h:31
int size
Definition: avcodec.h:1478
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1775
GLint GLenum type
Definition: opengl_enc.c:104
void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size)
Same behaviour av_fast_malloc but the buffer has additional AV_INPUT_BUFFER_PADDING_SIZE at the end w...
Definition: utils.c:70
uint8_t permutated[64]
Definition: idctdsp.h:33
static void copy_block8(uint8_t *dst, const uint8_t *src, ptrdiff_t dstStride, ptrdiff_t srcStride, int h)
Definition: copy_block.h:47
AVCodec.
Definition: avcodec.h:3481
static int get_sbits(GetBitContext *s, int n)
Definition: get_bits.h:359
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
Definition: decode_audio.c:42
static const uint16_t block_symbols[]
Definition: imm4.c:93
GetBitContext gb
Definition: imm4.c:38
static int get_cbphi(GetBitContext *gb, int x)
Definition: imm4.c:129
#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:40
uint8_t
#define av_cold
Definition: attributes.h:82
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:189
static uint32_t reverse(uint32_t num, int bits)
Definition: speedhq.c:565
void(* bswap_buf)(uint32_t *dst, const uint32_t *src, int w)
Definition: bswapdsp.h:25
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 offset
GLsizei GLboolean const GLfloat * value
Definition: opengl_enc.c:108
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:443
#define DECLARE_ALIGNED(n, t, v)
Declare a variable that is aligned in memory.
Definition: mem.h:112
#define height
unsigned lo
Definition: imm4.c:45
uint8_t * data
Definition: avcodec.h:1477
static av_cold void imm4_init_static_data(void)
Definition: imm4.c:489
bitstream reader API header.
static void decode_flush(AVCodecContext *avctx)
Definition: imm4.c:526
#define AVOnce
Definition: thread.h:159
#define FFALIGN(x, a)
Definition: macros.h:48
#define av_log(a,...)
static const uint16_t table[]
Definition: prosumer.c:206
static const uint8_t blktype_codes[]
Definition: imm4.c:89
uint8_t * bitstream
Definition: imm4.c:41
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:259
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
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
const char * name
Name of the codec implementation.
Definition: avcodec.h:3488
Definition: vlc.h:26
static int decode_inter(AVCodecContext *avctx, GetBitContext *gb, AVFrame *frame, AVFrame *prev)
Definition: imm4.c:264
static const uint8_t cbplo_codes[]
Definition: imm4.c:69
static av_cold int decode_close(AVCodecContext *avctx)
Definition: imm4.c:533
AVCodec ff_imm4_decoder
Definition: imm4.c:544
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:378
int factor
Definition: imm4.c:44
#define width
int width
picture width / height.
Definition: avcodec.h:1738
void(* idct_add)(uint8_t *dest, ptrdiff_t line_size, int16_t *block)
block -> idct -> add dest -> clip to unsigned 8 bit -> dest.
Definition: idctdsp.h:79
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
#define s(width, name)
Definition: cbs_vp9.c:257
static av_always_inline int get_vlc2(GetBitContext *s, VLC_TYPE(*table)[2], int bits, int max_depth)
Parse a vlc code.
Definition: get_bits.h:797
static VLC cbphi_tab
Definition: imm4.c:125
ScanTable intra_scantable
Definition: imm4.c:48
uint8_t idct_permutation[64]
IDCT input permutation.
Definition: idctdsp.h:96
void(* idct_put)(uint8_t *dest, ptrdiff_t line_size, int16_t *block)
block -> idct -> clip to unsigned 8 bit -> dest.
Definition: idctdsp.h:72
BswapDSPContext bdsp
Definition: imm4.c:37
#define FF_ARRAY_ELEMS(a)
the normal 2^n-1 "JPEG" YUV ranges
Definition: pixfmt.h:522
static int decode_block(AVCodecContext *avctx, GetBitContext *gb, int block, int factor, int flag, int offset, int flag2)
Definition: imm4.c:140
int bits
Definition: vlc.h:27
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:62
AVFrame * prev_frame
Definition: imm4.c:40
#define INIT_VLC_SPARSE_STATIC(vlc, bits, a, b, c, d, e, f, g, h, i, j, static_size)
Definition: vlc.h:57
#define AV_ONCE_INIT
Definition: thread.h:160
Libavcodec external API header.
static const uint8_t cbphi_codes[]
Definition: imm4.c:77
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:326
static VLC blktype_tab
Definition: imm4.c:126
static int init_get_bits8(GetBitContext *s, const uint8_t *buffer, int byte_size)
Initialize GetBitContext.
Definition: get_bits.h:677
main external API structure.
Definition: avcodec.h:1565
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: decode.c:1964
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:498
static void skip_bits1(GetBitContext *s)
Definition: get_bits.h:538
static int decode_blocks(AVCodecContext *avctx, GetBitContext *gb, unsigned cbp, int flag, int offset, unsigned flag2)
Definition: imm4.c:183
IDCTDSPContext idsp
Definition: imm4.c:50
static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: imm4.c:367
static unsigned int get_bits_long(GetBitContext *s, int n)
Read 0-32 bits.
Definition: get_bits.h:546
static void copy_block16(uint8_t *dst, const uint8_t *src, ptrdiff_t dstStride, ptrdiff_t srcStride, int h)
Definition: copy_block.h:68
void av_frame_unref(AVFrame *frame)
Unreference all the buffers referenced by frame and reset the frame fields.
Definition: frame.c:553
int bitstream_size
Definition: imm4.c:42
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:309
static const uint8_t cbphi_bits[]
Definition: imm4.c:73
static const uint8_t block_codes[]
Definition: imm4.c:115
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:66
common internal api header.
#define flag(name)
Definition: cbs_av1.c:553
static const uint8_t inter_cb[]
Definition: imm4.c:57
unsigned hi
Definition: imm4.c:46
static const uint8_t cbplo_bits[]
Definition: imm4.c:65
av_cold void ff_bswapdsp_init(BswapDSPContext *c)
Definition: bswapdsp.c:49
void * priv_data
Definition: avcodec.h:1592
av_cold void ff_init_scantable(uint8_t *permutation, ScanTable *st, const uint8_t *src_scantable)
Definition: idctdsp.c:29
av_cold void ff_idctdsp_init(IDCTDSPContext *c, AVCodecContext *avctx)
Definition: idctdsp.c:238
int len
static int ff_thread_once(char *control, void(*routine)(void))
Definition: thread.h:162
VLC_TYPE(* table)[2]
code, bits
Definition: vlc.h:28
int key_frame
1 -> keyframe, 0-> not
Definition: frame.h:373
#define av_freep(p)
static VLC block_tab
Definition: imm4.c:127
static const uint8_t block_bits[]
Definition: imm4.c:106
static const uint8_t intra_cb[]
Definition: imm4.c:53
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
static const uint8_t cbplo_symbols[]
Definition: imm4.c:61
This structure stores compressed data.
Definition: avcodec.h:1454
#define AV_GET_BUFFER_FLAG_REF
The decoder will keep a reference to the frame and may reuse it later.
Definition: avcodec.h:1176
mode
Use these values in ebur128_init (or&#39;ed).
Definition: ebur128.h:83
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:981
static const uint8_t blktype_symbols[]
Definition: imm4.c:81
Predicted.
Definition: avutil.h:275
static av_cold int decode_init(AVCodecContext *avctx)
Definition: imm4.c:504
static int decode_intra(AVCodecContext *avctx, GetBitContext *gb, AVFrame *frame)
Definition: imm4.c:213