FFmpeg
mimic.c
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1 /*
2  * Copyright (C) 2005 Ole André Vadla Ravnås <oleavr@gmail.com>
3  * Copyright (C) 2008 Ramiro Polla
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 <stdint.h>
23 
24 #include "libavutil/mem_internal.h"
25 #include "libavutil/thread.h"
26 
27 #include "avcodec.h"
28 #include "blockdsp.h"
29 #include "codec_internal.h"
30 #include "decode.h"
31 #include "get_bits.h"
32 #include "bytestream.h"
33 #include "bswapdsp.h"
34 #include "hpeldsp.h"
35 #include "idctdsp.h"
36 #include "thread.h"
37 #include "threadframe.h"
38 
39 #define MIMIC_HEADER_SIZE 20
40 #define MIMIC_VLC_BITS 11
41 
42 typedef struct MimicContext {
44 
45  int num_vblocks[3];
46  int num_hblocks[3];
47 
48  void *swap_buf;
50 
51  int cur_index;
53 
55 
56  DECLARE_ALIGNED(32, int16_t, dct_block)[64];
57 
59  uint8_t permutated_scantable[64];
64 
65  /* Kept in the context so multithreading can have a constant to read from */
68 } MimicContext;
69 
70 static VLCElem block_vlc[4368];
71 
72 static const uint8_t huffsyms[] = {
73  0x10, 0x20, 0x30, 0x00, 0x11, 0x40, 0x50, 0x12, 0x13, 0x21, 0x31, 0x60,
74  0x14, 0x15, 0x16, 0x22, 0x41, 0x17, 0x18, 0x23, 0x24, 0x25, 0x32, 0x42,
75  0x51, 0x61, 0x70, 0x19, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F, 0x26, 0x27,
76  0x28, 0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x2E, 0x33, 0x34, 0x35, 0x36, 0x37,
77  0x38, 0x39, 0x3A, 0x3B, 0x3C, 0x3D, 0x3E, 0x43, 0x44, 0x45, 0x46, 0x47,
78  0x48, 0x49, 0x4A, 0x4B, 0x4C, 0x4D, 0x4E, 0x52, 0x53, 0x54, 0x55, 0x56,
79  0x57, 0x58, 0x59, 0x5A, 0x5B, 0x5C, 0x5D, 0x5E, 0x62, 0x63, 0x64, 0x65,
80  0x66, 0x67, 0x68, 0x69, 0x6A, 0x6B, 0x6C, 0x6D, 0x6E, 0x71, 0x72, 0x73,
81  0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7A, 0x7B, 0x7C, 0x7D, 0x7E,
82 };
83 
84 static const uint8_t huffbits[] = {
85  2, 2, 3, 4, 4, 4, 5, 5, 6, 6, 6, 6, 7, 7, 7, 7, 8, 8,
86  8, 8, 9, 9, 9, 9, 10, 10, 10, 10, 11, 11, 11, 11, 12, 12, 12, 12,
87  13, 13, 13, 13, 14, 14, 14, 14, 15, 15, 15, 15, 16, 16, 16, 16, 17, 17,
88  17, 17, 18, 18, 18, 18, 19, 19, 19, 19, 20, 20, 20, 20, 21, 21, 21, 21,
89  22, 22, 22, 22, 23, 23, 23, 23, 24, 24, 24, 24, 25, 25, 25, 25, 26, 26,
90  26, 26, 27, 27, 27, 27, 28, 28, 28, 28, 29, 29, 29, 29, 30, 30, 30,
91 };
92 
93 static const uint8_t col_zag[64] = {
94  0, 8, 1, 2, 9, 16, 24, 17,
95  10, 3, 4, 11, 18, 25, 32, 40,
96  33, 26, 19, 12, 5, 6, 13, 20,
97  27, 34, 41, 48, 56, 49, 42, 35,
98  28, 21, 14, 7, 15, 22, 29, 36,
99  43, 50, 57, 58, 51, 44, 37, 30,
100  23, 31, 38, 45, 52, 59, 39, 46,
101  53, 60, 61, 54, 47, 55, 62, 63,
102 };
103 
105 {
106  MimicContext *ctx = avctx->priv_data;
107  int i;
108 
109  av_freep(&ctx->swap_buf);
110  ctx->swap_buf_size = 0;
111 
112  for (i = 0; i < FF_ARRAY_ELEMS(ctx->frames); i++) {
113  if (ctx->frames[i].f)
115  av_frame_free(&ctx->frames[i].f);
116  }
117 
118  return 0;
119 }
120 
121 static av_cold void mimic_init_static(void)
122 {
125  huffbits, 1, huffsyms, 1, 1, 0, 0);
126 }
127 
129 {
130  static AVOnce init_static_once = AV_ONCE_INIT;
131  MimicContext *ctx = avctx->priv_data;
132  int i;
133 
134  ctx->prev_index = 0;
135  ctx->cur_index = 15;
136 
137  ff_blockdsp_init(&ctx->bdsp);
138  ff_bswapdsp_init(&ctx->bbdsp);
139  ff_hpeldsp_init(&ctx->hdsp, avctx->flags);
140  ff_idctdsp_init(&ctx->idsp, avctx);
141  ff_permute_scantable(ctx->permutated_scantable, col_zag, ctx->idsp.idct_permutation);
142 
143  for (i = 0; i < FF_ARRAY_ELEMS(ctx->frames); i++) {
144  ctx->frames[i].f = av_frame_alloc();
145  if (!ctx->frames[i].f)
146  return AVERROR(ENOMEM);
147  }
148 
149  ff_thread_once(&init_static_once, mimic_init_static);
150 
151  return 0;
152 }
153 
154 #if HAVE_THREADS
155 static int mimic_decode_update_thread_context(AVCodecContext *avctx, const AVCodecContext *avctx_from)
156 {
157  MimicContext *dst = avctx->priv_data, *src = avctx_from->priv_data;
158  int i, ret;
159 
160  if (avctx == avctx_from)
161  return 0;
162 
163  dst->cur_index = src->next_cur_index;
164  dst->prev_index = src->next_prev_index;
165 
166  for (i = 0; i < FF_ARRAY_ELEMS(dst->frames); i++) {
168  if (i != src->next_cur_index && src->frames[i].f->data[0]) {
169  ret = ff_thread_ref_frame(&dst->frames[i], &src->frames[i]);
170  if (ret < 0)
171  return ret;
172  }
173  }
174 
175  return 0;
176 }
177 #endif
178 
179 static const int8_t vlcdec_lookup[9][64] = {
180  { 0, },
181  { -1, 1, },
182  { -3, 3, -2, 2, },
183  { -7, 7, -6, 6, -5, 5, -4, 4, },
184  { -15, 15, -14, 14, -13, 13, -12, 12,
185  -11, 11, -10, 10, -9, 9, -8, 8, },
186  { -31, 31, -30, 30, -29, 29, -28, 28,
187  -27, 27, -26, 26, -25, 25, -24, 24,
188  -23, 23, -22, 22, -21, 21, -20, 20,
189  -19, 19, -18, 18, -17, 17, -16, 16, },
190  { -63, 63, -62, 62, -61, 61, -60, 60,
191  -59, 59, -58, 58, -57, 57, -56, 56,
192  -55, 55, -54, 54, -53, 53, -52, 52,
193  -51, 51, -50, 50, -49, 49, -48, 48,
194  -47, 47, -46, 46, -45, 45, -44, 44,
195  -43, 43, -42, 42, -41, 41, -40, 40,
196  -39, 39, -38, 38, -37, 37, -36, 36,
197  -35, 35, -34, 34, -33, 33, -32, 32, },
198  { -127, 127, -126, 126, -125, 125, -124, 124,
199  -123, 123, -122, 122, -121, 121, -120, 120,
200  -119, 119, -118, 118, -117, 117, -116, 116,
201  -115, 115, -114, 114, -113, 113, -112, 112,
202  -111, 111, -110, 110, -109, 109, -108, 108,
203  -107, 107, -106, 106, -105, 105, -104, 104,
204  -103, 103, -102, 102, -101, 101, -100, 100,
205  -99, 99, -98, 98, -97, 97, -96, 96, },
206  { -95, 95, -94, 94, -93, 93, -92, 92,
207  -91, 91, -90, 90, -89, 89, -88, 88,
208  -87, 87, -86, 86, -85, 85, -84, 84,
209  -83, 83, -82, 82, -81, 81, -80, 80,
210  -79, 79, -78, 78, -77, 77, -76, 76,
211  -75, 75, -74, 74, -73, 73, -72, 72,
212  -71, 71, -70, 70, -69, 69, -68, 68,
213  -67, 67, -66, 66, -65, 65, -64, 64, },
214 };
215 
216 static int vlc_decode_block(MimicContext *ctx, int num_coeffs, int qscale)
217 {
218  int16_t *block = ctx->dct_block;
219  unsigned int pos;
220 
221  ctx->bdsp.clear_block(block);
222 
223  block[0] = get_bits(&ctx->gb, 8) << 3;
224 
225  for (pos = 1; pos < num_coeffs; pos++) {
226  uint32_t vlc, num_bits;
227  int value;
228  int coeff;
229 
230  vlc = get_vlc2(&ctx->gb, block_vlc, MIMIC_VLC_BITS, 3);
231  if (!vlc) /* end-of-block code */
232  return 0;
233  if (vlc == -1)
234  return AVERROR_INVALIDDATA;
235 
236  /* pos_add and num_bits are coded in the vlc code */
237  pos += vlc & 15; // pos_add
238  num_bits = vlc >> 4; // num_bits
239 
240  if (pos >= 64)
241  return AVERROR_INVALIDDATA;
242 
243  value = get_bits(&ctx->gb, num_bits);
244 
245  /* FFmpeg's IDCT behaves somewhat different from the original code, so
246  * a factor of 4 was added to the input */
247 
248  coeff = ((int8_t*)vlcdec_lookup[num_bits])[value];
249  if (pos < 3)
250  coeff *= 16;
251  else /* TODO Use >> 10 instead of / 1001 */
252  coeff = (coeff * qscale) / 1001;
253 
254  block[ctx->permutated_scantable[pos]] = coeff;
255  }
256 
257  return 0;
258 }
259 
260 static int decode(MimicContext *ctx, int quality, int num_coeffs,
261  int is_iframe)
262 {
263  int ret, y, x, plane, cur_row = 0;
264 
265  for (plane = 0; plane < 3; plane++) {
266  const int is_chroma = !!plane;
267  const int qscale = av_clip(10000 - quality, is_chroma ? 1000 : 2000,
268  10000) << 2;
269  const int stride = ctx->frames[ctx->cur_index ].f->linesize[plane];
270  uint8_t *dst = ctx->frames[ctx->cur_index ].f->data[plane];
271  /* src is unused for I frames; set to avoid UB pointer arithmetic. */
272  const uint8_t *src = is_iframe ? dst : ctx->frames[ctx->prev_index].f->data[plane];
273 
274  for (y = 0; y < ctx->num_vblocks[plane]; y++) {
275  for (x = 0; x < ctx->num_hblocks[plane]; x++) {
276  /* Check for a change condition in the current block.
277  * - iframes always change.
278  * - Luma plane changes on get_bits1 == 0
279  * - Chroma planes change on get_bits1 == 1 */
280  if (is_iframe || get_bits1(&ctx->gb) == is_chroma) {
281  /* Luma planes may use a backreference from the 15 last
282  * frames preceding the previous. (get_bits1 == 1)
283  * Chroma planes don't use backreferences. */
284  if (is_chroma || is_iframe || !get_bits1(&ctx->gb)) {
285  if ((ret = vlc_decode_block(ctx, num_coeffs,
286  qscale)) < 0) {
287  av_log(ctx->avctx, AV_LOG_ERROR, "Error decoding "
288  "block.\n");
289  return ret;
290  }
291  ctx->idsp.idct_put(dst, stride, ctx->dct_block);
292  } else {
293  unsigned int backref = get_bits(&ctx->gb, 4);
294  int index = (ctx->cur_index + backref) & 15;
295  uint8_t *p = ctx->frames[index].f->data[0];
296 
297  if (index != ctx->cur_index && p) {
299  cur_row, 0);
300  p += src -
301  ctx->frames[ctx->prev_index].f->data[plane];
302  ctx->hdsp.put_pixels_tab[1][0](dst, p, stride, 8);
303  } else {
304  av_log(ctx->avctx, AV_LOG_ERROR,
305  "No such backreference! Buggy sample.\n");
306  }
307  }
308  } else {
309  ff_thread_await_progress(&ctx->frames[ctx->prev_index],
310  cur_row, 0);
311  ctx->hdsp.put_pixels_tab[1][0](dst, src, stride, 8);
312  }
313  src += 8;
314  dst += 8;
315  }
316  src += (stride - ctx->num_hblocks[plane]) << 3;
317  dst += (stride - ctx->num_hblocks[plane]) << 3;
318 
319  ff_thread_report_progress(&ctx->frames[ctx->cur_index],
320  cur_row++, 0);
321  }
322  }
323 
324  return 0;
325 }
326 
327 /**
328  * Flip the buffer upside-down and put it in the YVU order to revert the
329  * way Mimic encodes frames.
330  */
331 static void flip_swap_frame(AVFrame *f)
332 {
333  int i;
334  uint8_t *data_1 = f->data[1];
335  f->data[0] = f->data[0] + ( f->height - 1) * f->linesize[0];
336  f->data[1] = f->data[2] + ((f->height >> 1) - 1) * f->linesize[2];
337  f->data[2] = data_1 + ((f->height >> 1) - 1) * f->linesize[1];
338  for (i = 0; i < 3; i++)
339  f->linesize[i] *= -1;
340 }
341 
342 static int mimic_decode_frame(AVCodecContext *avctx, AVFrame *rframe,
343  int *got_frame, AVPacket *avpkt)
344 {
345  const uint8_t *buf = avpkt->data;
346  int buf_size = avpkt->size;
347  int swap_buf_size = buf_size - MIMIC_HEADER_SIZE;
348  MimicContext *ctx = avctx->priv_data;
349  GetByteContext gb;
350  int is_pframe;
351  int width, height;
352  int quality, num_coeffs;
353  int res;
354 
355  if (buf_size <= MIMIC_HEADER_SIZE) {
356  av_log(avctx, AV_LOG_ERROR, "insufficient data\n");
357  return AVERROR_INVALIDDATA;
358  }
359 
361  bytestream2_skip(&gb, 2); /* some constant (always 256) */
362  quality = bytestream2_get_le16u(&gb);
363  width = bytestream2_get_le16u(&gb);
364  height = bytestream2_get_le16u(&gb);
365  bytestream2_skip(&gb, 4); /* some constant */
366  is_pframe = bytestream2_get_le32u(&gb);
367  num_coeffs = bytestream2_get_byteu(&gb);
368  bytestream2_skip(&gb, 3); /* some constant */
369 
370  if (!ctx->avctx) {
371  int i;
372 
373  if (!(width == 160 && height == 120) &&
374  !(width == 320 && height == 240)) {
375  av_log(avctx, AV_LOG_ERROR, "invalid width/height!\n");
376  return AVERROR_INVALIDDATA;
377  }
378 
379  res = ff_set_dimensions(avctx, width, height);
380  if (res < 0)
381  return res;
382 
383  ctx->avctx = avctx;
384  avctx->pix_fmt = AV_PIX_FMT_YUV420P;
385  for (i = 0; i < 3; i++) {
386  ctx->num_vblocks[i] = AV_CEIL_RSHIFT(height, 3 + !!i);
387  ctx->num_hblocks[i] = width >> (3 + !!i);
388  }
389  } else if (width != ctx->avctx->width || height != ctx->avctx->height) {
390  avpriv_request_sample(avctx, "Resolution changing");
391  return AVERROR_PATCHWELCOME;
392  }
393 
394  if (is_pframe && !ctx->frames[ctx->prev_index].f->data[0]) {
395  av_log(avctx, AV_LOG_ERROR, "decoding must start with keyframe\n");
396  return AVERROR_INVALIDDATA;
397  }
398 
399  ff_thread_release_ext_buffer(&ctx->frames[ctx->cur_index]);
400  ctx->frames[ctx->cur_index].f->pict_type = is_pframe ? AV_PICTURE_TYPE_P :
402  if ((res = ff_thread_get_ext_buffer(avctx, &ctx->frames[ctx->cur_index],
404  return res;
405 
406  ctx->next_prev_index = ctx->cur_index;
407  ctx->next_cur_index = (ctx->cur_index - 1) & 15;
408 
409  ff_thread_finish_setup(avctx);
410 
411  av_fast_padded_malloc(&ctx->swap_buf, &ctx->swap_buf_size, swap_buf_size);
412  if (!ctx->swap_buf)
413  return AVERROR(ENOMEM);
414 
415  ctx->bbdsp.bswap_buf(ctx->swap_buf,
416  (const uint32_t *) (buf + MIMIC_HEADER_SIZE),
417  swap_buf_size >> 2);
418  init_get_bits(&ctx->gb, ctx->swap_buf, swap_buf_size << 3);
419 
420  res = decode(ctx, quality, num_coeffs, !is_pframe);
421  ff_thread_report_progress(&ctx->frames[ctx->cur_index], INT_MAX, 0);
422  if (res < 0) {
423  if (!(avctx->active_thread_type & FF_THREAD_FRAME))
424  ff_thread_release_ext_buffer(&ctx->frames[ctx->cur_index]);
425  return res;
426  }
427 
428  if ((res = av_frame_ref(rframe, ctx->frames[ctx->cur_index].f)) < 0)
429  return res;
430  *got_frame = 1;
431 
432  flip_swap_frame(rframe);
433 
434  ctx->prev_index = ctx->next_prev_index;
435  ctx->cur_index = ctx->next_cur_index;
436 
437  return buf_size;
438 }
439 
441  .p.name = "mimic",
442  CODEC_LONG_NAME("Mimic"),
443  .p.type = AVMEDIA_TYPE_VIDEO,
444  .p.id = AV_CODEC_ID_MIMIC,
445  .priv_data_size = sizeof(MimicContext),
447  .close = mimic_decode_end,
449  .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
450  UPDATE_THREAD_CONTEXT(mimic_decode_update_thread_context),
451  .caps_internal = FF_CODEC_CAP_ALLOCATE_PROGRESS |
453 };
MimicContext::hdsp
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Definition: mimic.c:62
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Definition: mimic.c:70
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Definition: mimic.c:67
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Definition: mimic.c:63
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Definition: common.h:98
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Definition: codec_internal.h:42
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Definition: mimic.c:72
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Definition: mimic.c:39
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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
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Definition: mimic.c:84
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Definition: bytestream.h:33
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Definition: frame.c:100
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This structure describes decoded (raw) audio or video data.
Definition: frame.h:340
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Definition: packet.h:522
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Definition: codec_internal.h:127
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Definition: mimic.c:121
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Definition: blockdsp.h:32
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Definition: utils.c:94
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Definition: get_bits.h:514
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the pkt_dts and pkt_pts fields in AVFrame will work as usual Restrictions on codec whose streams don t reset across will not work because their bitstreams cannot be decoded in parallel *The contents of buffers must not be read before ff_thread_await_progress() has been called on them. reget_buffer() and buffer age optimizations no longer work. *The contents of buffers must not be written to after ff_thread_report_progress() has been called on them. This includes draw_edges(). Porting codecs to frame threading
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Definition: idctdsp.c:228
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Definition: rate_distortion.txt:12
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Definition: idctdsp.c:30
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Definition: bytestream.h:168
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Definition: get_bits.h:335
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Definition: codec_internal.h:131
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Definition: codec_id.h:165
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Definition: get_bits.h:108
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Definition: frame.c:88
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Definition: mimic.c:59
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Definition: thread.h:205
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#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:180
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Definition: attributes.h:90
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Definition: mimic.c:49
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Definition: pthread_frame.c:589
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FF_CODEC_DECODE_CB
#define FF_CODEC_DECODE_CB(func)
Definition: codec_internal.h:306
ff_blockdsp_init
av_cold void ff_blockdsp_init(BlockDSPContext *c)
Definition: blockdsp.c:58
AV_CEIL_RSHIFT
#define AV_CEIL_RSHIFT(a, b)
Definition: common.h:58
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
ff_mimic_decoder
const FFCodec ff_mimic_decoder
Definition: mimic.c:440
MimicContext::cur_index
int cur_index
Definition: mimic.c:51
ctx
AVFormatContext * ctx
Definition: movenc.c:48
decode.h
get_bits.h
flip_swap_frame
static void flip_swap_frame(AVFrame *f)
Flip the buffer upside-down and put it in the YVU order to revert the way Mimic encodes frames.
Definition: mimic.c:331
MimicContext::bbdsp
BswapDSPContext bbdsp
Definition: mimic.c:61
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
ff_hpeldsp_init
av_cold void ff_hpeldsp_init(HpelDSPContext *c, int flags)
Definition: hpeldsp.c:338
ff_thread_ref_frame
int ff_thread_ref_frame(ThreadFrame *dst, const ThreadFrame *src)
Definition: utils.c:871
AV_CODEC_CAP_FRAME_THREADS
#define AV_CODEC_CAP_FRAME_THREADS
Codec supports frame-level multithreading.
Definition: codec.h:110
threadframe.h
AV_ONCE_INIT
#define AV_ONCE_INIT
Definition: thread.h:203
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
MimicContext::swap_buf
void * swap_buf
Definition: mimic.c:48
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
ff_thread_release_ext_buffer
void ff_thread_release_ext_buffer(ThreadFrame *f)
Unref a ThreadFrame.
Definition: pthread_frame.c:1012
UPDATE_THREAD_CONTEXT
#define UPDATE_THREAD_CONTEXT(func)
Definition: codec_internal.h:281
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
index
int index
Definition: gxfenc.c:89
mimic_decode_end
static av_cold int mimic_decode_end(AVCodecContext *avctx)
Definition: mimic.c:104
HpelDSPContext
Half-pel DSP context.
Definition: hpeldsp.h:45
f
f
Definition: af_crystalizer.c:121
init
int(* init)(AVBSFContext *ctx)
Definition: dts2pts.c:365
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:523
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:361
codec_internal.h
DECLARE_ALIGNED
#define DECLARE_ALIGNED(n, t, v)
Definition: mem_internal.h:109
MimicContext::avctx
AVCodecContext * avctx
Definition: mimic.c:43
for
for(k=2;k<=8;++k)
Definition: h264pred_template.c:425
VLCElem
Definition: vlc.h:32
FF_CODEC_CAP_ALLOCATE_PROGRESS
#define FF_CODEC_CAP_ALLOCATE_PROGRESS
Definition: codec_internal.h:69
mimic_decode_init
static av_cold int mimic_decode_init(AVCodecContext *avctx)
Definition: mimic.c:128
height
#define height
MimicContext::dct_block
int16_t dct_block[64]
Definition: mimic.c:56
FF_THREAD_FRAME
#define FF_THREAD_FRAME
Decode more than one frame at once.
Definition: avcodec.h:1547
MimicContext::num_hblocks
int num_hblocks[3]
Definition: mimic.c:46
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:255
MimicContext::next_cur_index
int next_cur_index
Definition: mimic.c:66
decode
static int decode(MimicContext *ctx, int quality, int num_coeffs, int is_iframe)
Definition: mimic.c:260
vlcdec_lookup
static const int8_t vlcdec_lookup[9][64]
Definition: mimic.c:179
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
MIMIC_VLC_BITS
#define MIMIC_VLC_BITS
Definition: mimic.c:40
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
AVCodec::name
const char * name
Name of the codec implementation.
Definition: codec.h:194
AVCodecContext::pix_fmt
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:662
ff_thread_get_ext_buffer
int ff_thread_get_ext_buffer(AVCodecContext *avctx, ThreadFrame *f, int flags)
Wrapper around ff_get_buffer() for frame-multithreaded codecs.
Definition: pthread_frame.c:984
idctdsp.h
avcodec.h
stride
#define stride
Definition: h264pred_template.c:537
vlc_decode_block
static int vlc_decode_block(MimicContext *ctx, int num_coeffs, int qscale)
Definition: mimic.c:216
ret
ret
Definition: filter_design.txt:187
mimic_decode_frame
static int mimic_decode_frame(AVCodecContext *avctx, AVFrame *rframe, int *got_frame, AVPacket *avpkt)
Definition: mimic.c:342
pos
unsigned int pos
Definition: spdifenc.c:413
IDCTDSPContext
Definition: idctdsp.h:45
ff_thread_finish_setup
the pkt_dts and pkt_pts fields in AVFrame will work as usual Restrictions on codec whose streams don t reset across will not work because their bitstreams cannot be decoded in parallel *The contents of buffers must not be read before as well as code calling up to before the decode process starts Call ff_thread_finish_setup() afterwards. If some code can 't be moved
AVCodecContext
main external API structure.
Definition: avcodec.h:445
AVCodecContext::active_thread_type
int active_thread_type
Which multithreading methods are in use by the codec.
Definition: avcodec.h:1555
ThreadFrame
Definition: threadframe.h:27
MimicContext
Definition: mimic.c:42
MimicContext::frames
ThreadFrame frames[16]
Definition: mimic.c:54
col_zag
static const uint8_t col_zag[64]
Definition: mimic.c:93
MimicContext::prev_index
int prev_index
Definition: mimic.c:52
AV_PICTURE_TYPE_P
@ AV_PICTURE_TYPE_P
Predicted.
Definition: avutil.h:280
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
avpriv_request_sample
#define avpriv_request_sample(...)
Definition: tableprint_vlc.h:36
MimicContext::gb
GetBitContext gb
Definition: mimic.c:58
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:277
AVPacket
This structure stores compressed data.
Definition: packet.h:499
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:472
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:34
src
INIT_CLIP pixel * src
Definition: h264pred_template.c:418
bytestream.h
MimicContext::bdsp
BlockDSPContext bdsp
Definition: mimic.c:60
hpeldsp.h
bytestream2_init
static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)
Definition: bytestream.h:137
coeff
static const double coeff[2][5]
Definition: vf_owdenoise.c:79
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
MimicContext::num_vblocks
int num_vblocks[3]
Definition: mimic.c:45