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 <stddef.h>
24 #include <string.h>
25 
26 #include "libavutil/mem.h"
27 #include "libavutil/mem_internal.h"
28 #include "libavutil/thread.h"
29 
30 #include "avcodec.h"
31 #include "bswapdsp.h"
32 #include "codec_internal.h"
33 #include "decode.h"
34 #include "copy_block.h"
35 #include "get_bits.h"
36 #include "idctdsp.h"
37 
38 #define CBPLO_VLC_BITS 6
39 #define CBPHI_VLC_BITS 6
40 #define BLKTYPE_VLC_BITS 9
41 #define BLOCK_VLC_BITS 12
42 
43 typedef struct IMM4Context {
44  BswapDSPContext bdsp;
45  GetBitContext gb;
46 
47  AVFrame *prev_frame;
48  uint8_t *bitstream;
49  int bitstream_size;
50 
51  int factor;
52  unsigned lo;
53  unsigned hi;
54 
55  IDCTDSPContext idsp;
56  DECLARE_ALIGNED(32, int16_t, block)[6][64];
57 } IMM4Context;
58 
59 static const uint8_t intra_cb[] = {
60  24, 18, 12
61 };
62 
63 static const uint8_t inter_cb[] = {
64  30, 20, 15
65 };
66 
67 static const uint8_t cbplo[][2] = {
68  { 0,-6 }, { 0x01, 6 }, { 0x02, 6 }, { 0x03, 6 }, { 0x00, 4 },
69  { 0x01, 3 }, { 0x02, 3 }, { 0x03, 3 }, { 0x00, 1 },
70 };
71 
72 static const uint8_t cbphi_bits[] = {
73  4, 5, 5, 4, 5, 4, 6, 4, 5, 6, 4, 4, 4, 4, 4, 2
74 };
75 
76 static const uint8_t cbphi_codes[] = {
77  3, 5, 4, 9, 3, 7, 2, 11, 2, 3, 5, 10, 4, 8, 6, 3
78 };
79 
80 static const uint8_t blktype[][2] = {
81  { 0,-8 }, { 0x34, 9 }, { 0,-9 }, { 0x14, 9 }, { 0,-9 },
82  { 0x23, 8 }, { 0x13, 8 }, { 0x32, 8 }, { 0x33, 7 }, { 0x22, 7 },
83  { 0x12, 7 }, { 0x21, 7 }, { 0x11, 7 }, { 0x04, 6 }, { 0x30, 6 },
84  { 0x03, 5 }, { 0x20, 4 }, { 0x10, 4 }, { 0x02, 3 }, { 0x01, 3 },
85  { 0x00, 1 },
86 };
87 
88 static const uint16_t block_symbols[] = {
89  0, 0x4082, 0x4003, 0x000B, 0x000A, 0x4E01, 0x4D81, 0x4D01, 0x4C81,
90  0x0482, 0x0402, 0x0382, 0x0302, 0x0282, 0x0183, 0x0103, 0x0084, 0x000C,
91  0x0085, 0x0B81, 0x0C01, 0x4E81, 0x4F01, 0x4F81, 0x5001, 0x0086, 0x0104,
92  0x0203, 0x0283, 0x0303, 0x0502, 0x0C81, 0x0D01, 0x5081, 0x5101, 0x5181,
93  0x5201, 0x5281, 0x5301, 0x5381, 0x5401, 0x0000, 0x0009, 0x0008, 0x4C01,
94  0x4B81, 0x4B01, 0x4A81, 0x4A01, 0x4981, 0x4901, 0x4881, 0x4002, 0x0B01,
95  0x0A81, 0x0A01, 0x0981, 0x0901, 0x0881, 0x0801, 0x0781, 0x0202, 0x0182,
96  0x0007, 0x0006, 0x4801, 0x4781, 0x4701, 0x4681, 0x4601, 0x4581, 0x4501,
97  0x4481, 0x0701, 0x0681, 0x0102, 0x0083, 0x0005, 0x4401, 0x4381, 0x4301,
98  0x4281, 0x0601, 0x0581, 0x0501, 0x0004, 0x4201, 0x4181, 0x4101, 0x4081,
99  0x0481, 0x0401, 0x0381, 0x0301, 0x0082, 0x0003, 0x0281, 0x0201, 0x0181,
100  0x4001, 0x0001, 0x0081, 0x0101, 0x0002,
101 };
102 
103 static const uint8_t block_bits[] = {
104  -9, 11, 11, 11, 11, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 11, 11,
105  11, 11, 11, 11, 11, 11, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12,
106  12, 12, 12, 7, 10, 10, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
107  9, 9, 9, 9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
108  8, 8, 7, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6,
109  6, 5, 5, 5, 4, 2, 3, 4, 4,
110 };
111 
112 static VLCElem cbplo_tab[1 << CBPLO_VLC_BITS];
113 static VLCElem cbphi_tab[1 << CBPHI_VLC_BITS];
114 static VLCElem blktype_tab[1 << BLKTYPE_VLC_BITS];
115 static VLCElem block_tab[1 << BLOCK_VLC_BITS];
116 
117 static int get_cbphi(GetBitContext *gb, int x)
118 {
119  int value;
120 
121  value = get_vlc2(gb, cbphi_tab, CBPHI_VLC_BITS, 1);
122  if (value < 0)
123  return AVERROR_INVALIDDATA;
124 
125  return x ? value : 15 - value;
126 }
127 
128 static int decode_block(AVCodecContext *avctx, GetBitContext *gb,
129  int block, int factor, int flag, int offset, int flag2)
130 {
131  IMM4Context *s = avctx->priv_data;
132  const uint8_t *idct_permutation = s->idsp.idct_permutation;
133  int i, last, len, factor2;
134 
135  for (i = !flag; i < 64; i++) {
136  int value;
137 
138  value = get_vlc2(gb, block_tab, BLOCK_VLC_BITS, 1);
139  if (value < 0)
140  return AVERROR_INVALIDDATA;
141  if (value == 0) {
142  last = get_bits1(gb);
143  len = get_bits(gb, 6);
144  factor2 = get_sbits(gb, 8);
145  } else {
146  factor2 = value & 0x7F;
147  last = (value >> 14) & 1;
148  len = (value >> 7) & 0x3F;
149  if (get_bits1(gb))
150  factor2 = -factor2;
151  }
152  i += len;
153  if (i >= 64)
154  break;
155  s->block[block][idct_permutation[i]] = offset * (factor2 < 0 ? -1 : 1) + factor * factor2;
156  if (last)
157  break;
158  }
159 
160  if (s->hi == 2 && flag2 && block < 4) {
161  if (flag)
162  s->block[block][idct_permutation[0]] *= 2;
163  s->block[block][idct_permutation[1]] *= 2;
164  s->block[block][idct_permutation[8]] *= 2;
165  s->block[block][idct_permutation[16]] *= 2;
166  }
167 
168  return 0;
169 }
170 
171 static int decode_blocks(AVCodecContext *avctx, GetBitContext *gb,
172  unsigned cbp, int flag, int offset, unsigned flag2)
173 {
174  IMM4Context *s = avctx->priv_data;
175  const uint8_t *idct_permutation = s->idsp.idct_permutation;
176  int ret, i;
177 
178  memset(s->block, 0, sizeof(s->block));
179 
180  for (i = 0; i < 6; i++) {
181  if (!flag) {
182  int x = get_bits(gb, 8);
183 
184  if (x == 255)
185  x = 128;
186  x *= 8;
187 
188  s->block[i][idct_permutation[0]] = x;
189  }
190 
191  if (cbp & (1 << (5 - i))) {
192  ret = decode_block(avctx, gb, i, s->factor, flag, offset, flag2);
193  if (ret < 0)
194  return ret;
195  }
196  }
197 
198  return 0;
199 }
200 
201 static int decode_intra(AVCodecContext *avctx, GetBitContext *gb, AVFrame *frame)
202 {
203  IMM4Context *s = avctx->priv_data;
204  int ret, x, y, offset = 0;
205 
206  if (s->hi == 0) {
207  if (s->lo > 2)
208  return AVERROR_INVALIDDATA;
209  s->factor = intra_cb[s->lo];
210  } else {
211  s->factor = s->lo * 2;
212  }
213 
214  if (s->hi) {
215  offset = s->factor;
216  offset >>= 1;
217  if (!(offset & 1))
218  offset--;
219  }
220 
221  for (y = 0; y < avctx->height; y += 16) {
222  for (x = 0; x < avctx->width; x += 16) {
223  unsigned flag, cbphi, cbplo;
224 
225  cbplo = get_vlc2(gb, cbplo_tab, CBPLO_VLC_BITS, 1);
226  flag = get_bits1(gb);
227 
228  cbphi = get_cbphi(gb, 1);
229 
230  ret = decode_blocks(avctx, gb, cbplo | (cbphi << 2), 0, offset, flag);
231  if (ret < 0)
232  return ret;
233 
234  s->idsp.idct_put(frame->data[0] + y * frame->linesize[0] + x,
235  frame->linesize[0], s->block[0]);
236  s->idsp.idct_put(frame->data[0] + y * frame->linesize[0] + x + 8,
237  frame->linesize[0], s->block[1]);
238  s->idsp.idct_put(frame->data[0] + (y + 8) * frame->linesize[0] + x,
239  frame->linesize[0], s->block[2]);
240  s->idsp.idct_put(frame->data[0] + (y + 8) * frame->linesize[0] + x + 8,
241  frame->linesize[0], s->block[3]);
242  s->idsp.idct_put(frame->data[1] + (y >> 1) * frame->linesize[1] + (x >> 1),
243  frame->linesize[1], s->block[4]);
244  s->idsp.idct_put(frame->data[2] + (y >> 1) * frame->linesize[2] + (x >> 1),
245  frame->linesize[2], s->block[5]);
246  }
247  }
248 
249  return 0;
250 }
251 
252 static int decode_inter(AVCodecContext *avctx, GetBitContext *gb,
253  AVFrame *frame, AVFrame *prev)
254 {
255  IMM4Context *s = avctx->priv_data;
256  int ret, x, y, offset = 0;
257 
258  if (s->hi == 0) {
259  if (s->lo > 2)
260  return AVERROR_INVALIDDATA;
261  s->factor = inter_cb[s->lo];
262  } else {
263  s->factor = s->lo * 2;
264  }
265 
266  if (s->hi) {
267  offset = s->factor;
268  offset >>= 1;
269  if (!(offset & 1))
270  offset--;
271  }
272 
273  for (y = 0; y < avctx->height; y += 16) {
274  for (x = 0; x < avctx->width; x += 16) {
275  int reverse, intra_block, value;
276  unsigned cbphi, cbplo, flag2 = 0;
277 
278  if (get_bits1(gb)) {
279  copy_block16(frame->data[0] + y * frame->linesize[0] + x,
280  prev->data[0] + y * prev->linesize[0] + x,
281  frame->linesize[0], prev->linesize[0], 16);
282  copy_block8(frame->data[1] + (y >> 1) * frame->linesize[1] + (x >> 1),
283  prev->data[1] + (y >> 1) * prev->linesize[1] + (x >> 1),
284  frame->linesize[1], prev->linesize[1], 8);
285  copy_block8(frame->data[2] + (y >> 1) * frame->linesize[2] + (x >> 1),
286  prev->data[2] + (y >> 1) * prev->linesize[2] + (x >> 1),
287  frame->linesize[2], prev->linesize[2], 8);
288  continue;
289  }
290 
291  value = get_vlc2(gb, blktype_tab, BLKTYPE_VLC_BITS, 1);
292  if (value < 0)
293  return AVERROR_INVALIDDATA;
294 
295  intra_block = value & 0x07;
296  reverse = intra_block == 3;
297  if (reverse)
298  flag2 = get_bits1(gb);
299 
300  cbplo = value >> 4;
301  cbphi = get_cbphi(gb, reverse);
302  if (intra_block) {
303  ret = decode_blocks(avctx, gb, cbplo | (cbphi << 2), 0, offset, flag2);
304  if (ret < 0)
305  return ret;
306 
307  s->idsp.idct_put(frame->data[0] + y * frame->linesize[0] + x,
308  frame->linesize[0], s->block[0]);
309  s->idsp.idct_put(frame->data[0] + y * frame->linesize[0] + x + 8,
310  frame->linesize[0], s->block[1]);
311  s->idsp.idct_put(frame->data[0] + (y + 8) * frame->linesize[0] + x,
312  frame->linesize[0], s->block[2]);
313  s->idsp.idct_put(frame->data[0] + (y + 8) * frame->linesize[0] + x + 8,
314  frame->linesize[0], s->block[3]);
315  s->idsp.idct_put(frame->data[1] + (y >> 1) * frame->linesize[1] + (x >> 1),
316  frame->linesize[1], s->block[4]);
317  s->idsp.idct_put(frame->data[2] + (y >> 1) * frame->linesize[2] + (x >> 1),
318  frame->linesize[2], s->block[5]);
319  } else {
320  flag2 = get_bits1(gb);
321  skip_bits1(gb);
322  ret = decode_blocks(avctx, gb, cbplo | (cbphi << 2), 1, offset, flag2);
323  if (ret < 0)
324  return ret;
325 
326  copy_block16(frame->data[0] + y * frame->linesize[0] + x,
327  prev->data[0] + y * prev->linesize[0] + x,
328  frame->linesize[0], prev->linesize[0], 16);
329  copy_block8(frame->data[1] + (y >> 1) * frame->linesize[1] + (x >> 1),
330  prev->data[1] + (y >> 1) * prev->linesize[1] + (x >> 1),
331  frame->linesize[1], prev->linesize[1], 8);
332  copy_block8(frame->data[2] + (y >> 1) * frame->linesize[2] + (x >> 1),
333  prev->data[2] + (y >> 1) * prev->linesize[2] + (x >> 1),
334  frame->linesize[2], prev->linesize[2], 8);
335 
336  s->idsp.idct_add(frame->data[0] + y * frame->linesize[0] + x,
337  frame->linesize[0], s->block[0]);
338  s->idsp.idct_add(frame->data[0] + y * frame->linesize[0] + x + 8,
339  frame->linesize[0], s->block[1]);
340  s->idsp.idct_add(frame->data[0] + (y + 8) * frame->linesize[0] + x,
341  frame->linesize[0], s->block[2]);
342  s->idsp.idct_add(frame->data[0] + (y + 8) * frame->linesize[0] + x + 8,
343  frame->linesize[0], s->block[3]);
344  s->idsp.idct_add(frame->data[1] + (y >> 1) * frame->linesize[1] + (x >> 1),
345  frame->linesize[1], s->block[4]);
346  s->idsp.idct_add(frame->data[2] + (y >> 1) * frame->linesize[2] + (x >> 1),
347  frame->linesize[2], s->block[5]);
348  }
349  }
350  }
351 
352  return 0;
353 }
354 
355 static int decode_frame(AVCodecContext *avctx, AVFrame *frame,
356  int *got_frame, AVPacket *avpkt)
357 {
358  IMM4Context *s = avctx->priv_data;
359  GetBitContext *gb = &s->gb;
360  int width, height;
361  unsigned type;
362  int ret, scaled;
363 
364  if (avpkt->size <= 32)
365  return AVERROR_INVALIDDATA;
366 
367  av_fast_padded_malloc(&s->bitstream, &s->bitstream_size,
368  FFALIGN(avpkt->size, 4));
369  if (!s->bitstream)
370  return AVERROR(ENOMEM);
371 
372  s->bdsp.bswap_buf((uint32_t *)s->bitstream,
373  (uint32_t *)avpkt->data,
374  (avpkt->size + 3) >> 2);
375 
376  if ((ret = init_get_bits8(gb, s->bitstream, FFALIGN(avpkt->size, 4))) < 0)
377  return ret;
378 
379  avctx->pix_fmt = AV_PIX_FMT_YUV420P;
380  avctx->color_range = AVCOL_RANGE_JPEG;
381 
382  width = avctx->width;
383  height = avctx->height;
384 
385  scaled = avpkt->data[8];
386  if (scaled < 2) {
387  int mode = avpkt->data[10];
388 
389  switch (mode) {
390  case 1:
391  width = 352;
392  height = 240;
393  break;
394  case 2:
395  width = 704;
396  height = 240;
397  break;
398  case 4:
399  width = 480;
400  height = 704;
401  break;
402  case 17:
403  width = 352;
404  height = 288;
405  break;
406  case 18:
407  width = 704;
408  height = 288;
409  break;
410  default:
411  width = 704;
412  height = 576;
413  break;
414  }
415  }
416 
417  skip_bits_long(gb, 24 * 8);
418  type = get_bits_long(gb, 32);
419  s->hi = get_bits(gb, 16);
420  s->lo = get_bits(gb, 16);
421 
422  switch (type) {
423  case 0x19781977:
424  frame->flags |= AV_FRAME_FLAG_KEY;
425  frame->pict_type = AV_PICTURE_TYPE_I;
426  break;
427  case 0x12250926:
428  frame->flags &= ~AV_FRAME_FLAG_KEY;
429  frame->pict_type = AV_PICTURE_TYPE_P;
430  break;
431  default:
432  avpriv_request_sample(avctx, "type %X", type);
433  return AVERROR_PATCHWELCOME;
434  }
435 
436  if (avctx->width != width ||
437  avctx->height != height) {
438  if (!(frame->flags & AV_FRAME_FLAG_KEY)) {
439  av_log(avctx, AV_LOG_ERROR, "Frame size change is unsupported.\n");
440  return AVERROR_INVALIDDATA;
441  }
442  av_frame_unref(s->prev_frame);
443  }
444 
445  ret = ff_set_dimensions(avctx, width, height);
446  if (ret < 0)
447  return ret;
448 
449  if ((ret = ff_get_buffer(avctx, frame, (frame->flags & AV_FRAME_FLAG_KEY) ? AV_GET_BUFFER_FLAG_REF : 0)) < 0)
450  return ret;
451 
452  if (frame->flags & AV_FRAME_FLAG_KEY) {
453  ret = decode_intra(avctx, gb, frame);
454  if (ret < 0)
455  return ret;
456 
457  if ((ret = av_frame_replace(s->prev_frame, frame)) < 0)
458  return ret;
459  } else {
460  if (!s->prev_frame->data[0]) {
461  av_log(avctx, AV_LOG_ERROR, "Missing reference frame.\n");
462  return AVERROR_INVALIDDATA;
463  }
464 
465  ret = decode_inter(avctx, gb, frame, s->prev_frame);
466  if (ret < 0)
467  return ret;
468  }
469 
470  *got_frame = 1;
471 
472  return avpkt->size;
473 }
474 
475 static av_cold void imm4_init_static_data(void)
476 {
477  VLC_INIT_STATIC_TABLE_FROM_LENGTHS(cbplo_tab, CBPLO_VLC_BITS, FF_ARRAY_ELEMS(cbplo),
478  &cbplo[0][1], 2, &cbplo[0][0], 2, 1,
479  0, 0);
480 
481  VLC_INIT_STATIC_TABLE(cbphi_tab, CBPHI_VLC_BITS, FF_ARRAY_ELEMS(cbphi_bits),
482  cbphi_bits, 1, 1, cbphi_codes, 1, 1, 0);
483 
484  VLC_INIT_STATIC_TABLE_FROM_LENGTHS(blktype_tab, BLKTYPE_VLC_BITS, FF_ARRAY_ELEMS(blktype),
485  &blktype[0][1], 2, &blktype[0][0], 2, 1,
486  0, 0);
487 
488  VLC_INIT_STATIC_TABLE_FROM_LENGTHS(block_tab, BLOCK_VLC_BITS, FF_ARRAY_ELEMS(block_bits),
489  block_bits, 1, block_symbols, 2, 2,
490  0, 0);
491 }
492 
493 static av_cold int decode_init(AVCodecContext *avctx)
494 {
495  static AVOnce init_static_once = AV_ONCE_INIT;
496  IMM4Context *s = avctx->priv_data;
497 
498  ff_bswapdsp_init(&s->bdsp);
499  ff_idctdsp_init(&s->idsp, avctx);
500 
501  s->prev_frame = av_frame_alloc();
502  if (!s->prev_frame)
503  return AVERROR(ENOMEM);
504 
505  ff_thread_once(&init_static_once, imm4_init_static_data);
506 
507  return 0;
508 }
509 
510 static void decode_flush(AVCodecContext *avctx)
511 {
512  IMM4Context *s = avctx->priv_data;
513 
514  av_frame_unref(s->prev_frame);
515 }
516 
517 static av_cold int decode_close(AVCodecContext *avctx)
518 {
519  IMM4Context *s = avctx->priv_data;
520 
521  av_frame_free(&s->prev_frame);
522  av_freep(&s->bitstream);
523  s->bitstream_size = 0;
524 
525  return 0;
526 }
527 
528 const FFCodec ff_imm4_decoder = {
529  .p.name = "imm4",
530  CODEC_LONG_NAME("Infinity IMM4"),
531  .p.type = AVMEDIA_TYPE_VIDEO,
532  .p.id = AV_CODEC_ID_IMM4,
533  .priv_data_size = sizeof(IMM4Context),
534  .init = decode_init,
535  .close = decode_close,
536  FF_CODEC_DECODE_CB(decode_frame),
537  .flush = decode_flush,
538  .p.capabilities = AV_CODEC_CAP_DR1,
539  .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
540 };
imm4_init_static_data
static av_cold void imm4_init_static_data(void)
Definition: imm4.c:475
bswapdsp.h
IMM4Context::factor
int factor
Definition: imm4.c:51
skip_bits_long
static void skip_bits_long(GetBitContext *s, int n)
Skips the specified number of bits.
Definition: get_bits.h:278
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: codec_internal.h:42
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
blktype_tab
static VLCElem blktype_tab[1<< BLKTYPE_VLC_BITS]
Definition: imm4.c:114
mem_internal.h
get_cbphi
static int get_cbphi(GetBitContext *gb, int x)
Definition: imm4.c:117
thread.h
block_bits
static const uint8_t block_bits[]
Definition: imm4.c:103
get_bits_long
static unsigned int get_bits_long(GetBitContext *s, int n)
Read 0-32 bits.
Definition: get_bits.h:421
cbplo_tab
static VLCElem cbplo_tab[1<< CBPLO_VLC_BITS]
Definition: imm4.c:112
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
AVCOL_RANGE_JPEG
@ AVCOL_RANGE_JPEG
Full range content.
Definition: pixfmt.h:686
AVPacket::data
uint8_t * data
Definition: packet.h:524
FFCodec
Definition: codec_internal.h:127
copy_block8
static void copy_block8(uint8_t *dst, const uint8_t *src, ptrdiff_t dstStride, ptrdiff_t srcStride, int h)
Definition: copy_block.h:47
decode_frame
static int decode_frame(AVCodecContext *avctx, AVFrame *frame, int *got_frame, AVPacket *avpkt)
Definition: imm4.c:355
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:94
intra_cb
static const uint8_t intra_cb[]
Definition: imm4.c:59
ff_idctdsp_init
av_cold void ff_idctdsp_init(IDCTDSPContext *c, AVCodecContext *avctx)
Definition: idctdsp.c:228
decode_close
static av_cold int decode_close(AVCodecContext *avctx)
Definition: imm4.c:517
AVFrame::data
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:395
get_bits
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:335
FFCodec::p
AVCodec p
The public AVCodec.
Definition: codec_internal.h:131
cbplo
static const uint8_t cbplo[][2]
Definition: imm4.c:67
GetBitContext
Definition: get_bits.h:108
type
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 type
Definition: writing_filters.txt:86
decode_intra
static int decode_intra(AVCodecContext *avctx, GetBitContext *gb, AVFrame *frame)
Definition: imm4.c:201
av_frame_alloc
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:148
ff_thread_once
static int ff_thread_once(char *control, void(*routine)(void))
Definition: thread.h:205
CBPHI_VLC_BITS
#define CBPHI_VLC_BITS
Definition: imm4.c:39
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:180
FF_ARRAY_ELEMS
#define FF_ARRAY_ELEMS(a)
Definition: sinewin_tablegen.c:29
av_cold
#define av_cold
Definition: attributes.h:90
init_get_bits8
static int init_get_bits8(GetBitContext *s, const uint8_t *buffer, int byte_size)
Initialize GetBitContext.
Definition: get_bits.h:545
AV_FRAME_FLAG_KEY
#define AV_FRAME_FLAG_KEY
A flag to mark frames that are keyframes.
Definition: frame.h:625
width
#define width
FF_CODEC_DECODE_CB
#define FF_CODEC_DECODE_CB(func)
Definition: codec_internal.h:287
decode_block
static int decode_block(AVCodecContext *avctx, GetBitContext *gb, int block, int factor, int flag, int offset, int flag2)
Definition: imm4.c:128
s
#define s(width, name)
Definition: cbs_vp9.c:198
blktype
static const uint8_t blktype[][2]
Definition: imm4.c:80
BLKTYPE_VLC_BITS
#define BLKTYPE_VLC_BITS
Definition: imm4.c:40
IMM4Context::bdsp
BswapDSPContext bdsp
Definition: imm4.c:44
AV_GET_BUFFER_FLAG_REF
#define AV_GET_BUFFER_FLAG_REF
The decoder will keep a reference to the frame and may reuse it later.
Definition: avcodec.h:425
get_sbits
static int get_sbits(GetBitContext *s, int n)
Definition: get_bits.h:320
decode_init
static av_cold int decode_init(AVCodecContext *avctx)
Definition: imm4.c:493
decode.h
cbphi_codes
static const uint8_t cbphi_codes[]
Definition: imm4.c:76
get_bits.h
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:73
CODEC_LONG_NAME
#define CODEC_LONG_NAME(str)
Definition: codec_internal.h:272
IMM4Context::hi
unsigned hi
Definition: imm4.c:53
AV_ONCE_INIT
#define AV_ONCE_INIT
Definition: thread.h:203
copy_block16
static void copy_block16(uint8_t *dst, const uint8_t *src, ptrdiff_t dstStride, ptrdiff_t srcStride, int h)
Definition: copy_block.h:68
ff_bswapdsp_init
av_cold void ff_bswapdsp_init(BswapDSPContext *c)
Definition: bswapdsp.c:49
AVERROR_PATCHWELCOME
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:64
AVCodecContext::color_range
enum AVColorRange color_range
MPEG vs JPEG YUV range.
Definition: avcodec.h:695
AV_PICTURE_TYPE_I
@ AV_PICTURE_TYPE_I
Intra.
Definition: avutil.h:279
get_bits1
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:388
cbphi_bits
static const uint8_t cbphi_bits[]
Definition: imm4.c:72
CBPLO_VLC_BITS
#define CBPLO_VLC_BITS
Definition: imm4.c:38
get_vlc2
static av_always_inline int get_vlc2(GetBitContext *s, const VLCElem *table, int bits, int max_depth)
Parse a vlc code.
Definition: get_bits.h:652
AVOnce
#define AVOnce
Definition: thread.h:202
inter_cb
static const uint8_t inter_cb[]
Definition: imm4.c:63
IMM4Context::bitstream_size
int bitstream_size
Definition: imm4.c:49
ff_get_buffer
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: decode.c:1554
init
int(* init)(AVBSFContext *ctx)
Definition: dts2pts.c:366
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:525
codec_internal.h
DECLARE_ALIGNED
#define DECLARE_ALIGNED(n, t, v)
Definition: mem_internal.h:109
block_symbols
static const uint16_t block_symbols[]
Definition: imm4.c:88
VLCElem
Definition: vlc.h:32
decode_inter
static int decode_inter(AVCodecContext *avctx, GetBitContext *gb, AVFrame *frame, AVFrame *prev)
Definition: imm4.c:252
height
#define height
AV_CODEC_ID_IMM4
@ AV_CODEC_ID_IMM4
Definition: codec_id.h:287
offset
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
Definition: writing_filters.txt:86
skip_bits1
static void skip_bits1(GetBitContext *s)
Definition: get_bits.h:413
IMM4Context::prev_frame
AVFrame * prev_frame
Definition: imm4.c:47
flag
#define flag(name)
Definition: cbs_av1.c:466
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:256
copy_block.h
av_fast_padded_malloc
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:52
value
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 value
Definition: writing_filters.txt:86
av_frame_unref
void av_frame_unref(AVFrame *frame)
Unreference all the buffers referenced by frame and reset the frame fields.
Definition: frame.c:606
cbphi_tab
static VLCElem cbphi_tab[1<< CBPHI_VLC_BITS]
Definition: imm4.c:113
IMM4Context::bitstream
uint8_t * bitstream
Definition: imm4.c:48
AVCodec::name
const char * name
Name of the codec implementation.
Definition: codec.h:194
len
int len
Definition: vorbis_enc_data.h:426
AVCodecContext::height
int height
Definition: avcodec.h:618
AVCodecContext::pix_fmt
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:657
IMM4Context::block
int16_t block[6][64]
Definition: imm4.c:56
idctdsp.h
avcodec.h
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
IDCTDSPContext
Definition: idctdsp.h:43
ff_imm4_decoder
const FFCodec ff_imm4_decoder
Definition: imm4.c:528
av_frame_replace
int av_frame_replace(AVFrame *dst, const AVFrame *src)
Ensure the destination frame refers to the same data described by the source frame,...
Definition: frame.c:483
AVCodecContext
main external API structure.
Definition: avcodec.h:445
IMM4Context::gb
GetBitContext gb
Definition: imm4.c:45
mode
mode
Definition: ebur128.h:83
VLC_INIT_STATIC_TABLE
#define VLC_INIT_STATIC_TABLE(vlc_table, nb_bits, nb_codes, bits, bits_wrap, bits_size, codes, codes_wrap, codes_size, flags)
Definition: vlc.h:270
factor
static const int factor[16]
Definition: vf_pp7.c:79
AV_PICTURE_TYPE_P
@ AV_PICTURE_TYPE_P
Predicted.
Definition: avutil.h:280
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
mem.h
BLOCK_VLC_BITS
#define BLOCK_VLC_BITS
Definition: imm4.c:41
avpriv_request_sample
#define avpriv_request_sample(...)
Definition: tableprint_vlc.h:36
VLC_INIT_STATIC_TABLE_FROM_LENGTHS
#define VLC_INIT_STATIC_TABLE_FROM_LENGTHS(vlc_table, nb_bits, nb_codes, lens, lens_wrap, syms, syms_wrap, syms_size, offset, flags)
Definition: vlc.h:280
FFALIGN
#define FFALIGN(x, a)
Definition: macros.h:78
AVPacket
This structure stores compressed data.
Definition: packet.h:501
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:472
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:34
IMM4Context
Definition: imm4.c:43
AVCodecContext::width
int width
picture width / height.
Definition: avcodec.h:618
block_tab
static VLCElem block_tab[1<< BLOCK_VLC_BITS]
Definition: imm4.c:115
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
block
The exact code depends on how similar the blocks are and how related they are to the block
Definition: filter_design.txt:207
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
BswapDSPContext
Definition: bswapdsp.h:24
decode_flush
static void decode_flush(AVCodecContext *avctx)
Definition: imm4.c:510
decode_blocks
static int decode_blocks(AVCodecContext *avctx, GetBitContext *gb, unsigned cbp, int flag, int offset, unsigned flag2)
Definition: imm4.c:171
IMM4Context::idsp
IDCTDSPContext idsp
Definition: imm4.c:55
IMM4Context::lo
unsigned lo
Definition: imm4.c:52
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