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 VLC block_vlc;
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)
114  ff_thread_release_ext_buffer(avctx, &ctx->frames[i]);
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 {
124  huffbits, 1, huffsyms, 1, 1, 0, 0, 4368);
125 }
126 
128 {
129  static AVOnce init_static_once = AV_ONCE_INIT;
130  MimicContext *ctx = avctx->priv_data;
131  int i;
132 
133  ctx->prev_index = 0;
134  ctx->cur_index = 15;
135 
136  ff_blockdsp_init(&ctx->bdsp);
137  ff_bswapdsp_init(&ctx->bbdsp);
138  ff_hpeldsp_init(&ctx->hdsp, avctx->flags);
139  ff_idctdsp_init(&ctx->idsp, avctx);
140  ff_permute_scantable(ctx->permutated_scantable, col_zag, ctx->idsp.idct_permutation);
141 
142  for (i = 0; i < FF_ARRAY_ELEMS(ctx->frames); i++) {
143  ctx->frames[i].f = av_frame_alloc();
144  if (!ctx->frames[i].f)
145  return AVERROR(ENOMEM);
146  }
147 
148  ff_thread_once(&init_static_once, mimic_init_static);
149 
150  return 0;
151 }
152 
153 #if HAVE_THREADS
154 static int mimic_decode_update_thread_context(AVCodecContext *avctx, const AVCodecContext *avctx_from)
155 {
156  MimicContext *dst = avctx->priv_data, *src = avctx_from->priv_data;
157  int i, ret;
158 
159  if (avctx == avctx_from)
160  return 0;
161 
162  dst->cur_index = src->next_cur_index;
163  dst->prev_index = src->next_prev_index;
164 
165  for (i = 0; i < FF_ARRAY_ELEMS(dst->frames); i++) {
166  ff_thread_release_ext_buffer(avctx, &dst->frames[i]);
167  if (i != src->next_cur_index && src->frames[i].f->data[0]) {
168  ret = ff_thread_ref_frame(&dst->frames[i], &src->frames[i]);
169  if (ret < 0)
170  return ret;
171  }
172  }
173 
174  return 0;
175 }
176 #endif
177 
178 static const int8_t vlcdec_lookup[9][64] = {
179  { 0, },
180  { -1, 1, },
181  { -3, 3, -2, 2, },
182  { -7, 7, -6, 6, -5, 5, -4, 4, },
183  { -15, 15, -14, 14, -13, 13, -12, 12,
184  -11, 11, -10, 10, -9, 9, -8, 8, },
185  { -31, 31, -30, 30, -29, 29, -28, 28,
186  -27, 27, -26, 26, -25, 25, -24, 24,
187  -23, 23, -22, 22, -21, 21, -20, 20,
188  -19, 19, -18, 18, -17, 17, -16, 16, },
189  { -63, 63, -62, 62, -61, 61, -60, 60,
190  -59, 59, -58, 58, -57, 57, -56, 56,
191  -55, 55, -54, 54, -53, 53, -52, 52,
192  -51, 51, -50, 50, -49, 49, -48, 48,
193  -47, 47, -46, 46, -45, 45, -44, 44,
194  -43, 43, -42, 42, -41, 41, -40, 40,
195  -39, 39, -38, 38, -37, 37, -36, 36,
196  -35, 35, -34, 34, -33, 33, -32, 32, },
197  { -127, 127, -126, 126, -125, 125, -124, 124,
198  -123, 123, -122, 122, -121, 121, -120, 120,
199  -119, 119, -118, 118, -117, 117, -116, 116,
200  -115, 115, -114, 114, -113, 113, -112, 112,
201  -111, 111, -110, 110, -109, 109, -108, 108,
202  -107, 107, -106, 106, -105, 105, -104, 104,
203  -103, 103, -102, 102, -101, 101, -100, 100,
204  -99, 99, -98, 98, -97, 97, -96, 96, },
205  { -95, 95, -94, 94, -93, 93, -92, 92,
206  -91, 91, -90, 90, -89, 89, -88, 88,
207  -87, 87, -86, 86, -85, 85, -84, 84,
208  -83, 83, -82, 82, -81, 81, -80, 80,
209  -79, 79, -78, 78, -77, 77, -76, 76,
210  -75, 75, -74, 74, -73, 73, -72, 72,
211  -71, 71, -70, 70, -69, 69, -68, 68,
212  -67, 67, -66, 66, -65, 65, -64, 64, },
213 };
214 
215 static int vlc_decode_block(MimicContext *ctx, int num_coeffs, int qscale)
216 {
217  int16_t *block = ctx->dct_block;
218  unsigned int pos;
219 
220  ctx->bdsp.clear_block(block);
221 
222  block[0] = get_bits(&ctx->gb, 8) << 3;
223 
224  for (pos = 1; pos < num_coeffs; pos++) {
225  uint32_t vlc, num_bits;
226  int value;
227  int coeff;
228 
229  vlc = get_vlc2(&ctx->gb, block_vlc.table, MIMIC_VLC_BITS, 3);
230  if (!vlc) /* end-of-block code */
231  return 0;
232  if (vlc == -1)
233  return AVERROR_INVALIDDATA;
234 
235  /* pos_add and num_bits are coded in the vlc code */
236  pos += vlc & 15; // pos_add
237  num_bits = vlc >> 4; // num_bits
238 
239  if (pos >= 64)
240  return AVERROR_INVALIDDATA;
241 
242  value = get_bits(&ctx->gb, num_bits);
243 
244  /* FFmpeg's IDCT behaves somewhat different from the original code, so
245  * a factor of 4 was added to the input */
246 
247  coeff = ((int8_t*)vlcdec_lookup[num_bits])[value];
248  if (pos < 3)
249  coeff *= 16;
250  else /* TODO Use >> 10 instead of / 1001 */
251  coeff = (coeff * qscale) / 1001;
252 
253  block[ctx->permutated_scantable[pos]] = coeff;
254  }
255 
256  return 0;
257 }
258 
259 static int decode(MimicContext *ctx, int quality, int num_coeffs,
260  int is_iframe)
261 {
262  int ret, y, x, plane, cur_row = 0;
263 
264  for (plane = 0; plane < 3; plane++) {
265  const int is_chroma = !!plane;
266  const int qscale = av_clip(10000 - quality, is_chroma ? 1000 : 2000,
267  10000) << 2;
268  const int stride = ctx->frames[ctx->cur_index ].f->linesize[plane];
269  uint8_t *dst = ctx->frames[ctx->cur_index ].f->data[plane];
270  /* src is unused for I frames; set to avoid UB pointer arithmetic. */
271  const uint8_t *src = is_iframe ? dst : ctx->frames[ctx->prev_index].f->data[plane];
272 
273  for (y = 0; y < ctx->num_vblocks[plane]; y++) {
274  for (x = 0; x < ctx->num_hblocks[plane]; x++) {
275  /* Check for a change condition in the current block.
276  * - iframes always change.
277  * - Luma plane changes on get_bits1 == 0
278  * - Chroma planes change on get_bits1 == 1 */
279  if (is_iframe || get_bits1(&ctx->gb) == is_chroma) {
280  /* Luma planes may use a backreference from the 15 last
281  * frames preceding the previous. (get_bits1 == 1)
282  * Chroma planes don't use backreferences. */
283  if (is_chroma || is_iframe || !get_bits1(&ctx->gb)) {
284  if ((ret = vlc_decode_block(ctx, num_coeffs,
285  qscale)) < 0) {
286  av_log(ctx->avctx, AV_LOG_ERROR, "Error decoding "
287  "block.\n");
288  return ret;
289  }
290  ctx->idsp.idct_put(dst, stride, ctx->dct_block);
291  } else {
292  unsigned int backref = get_bits(&ctx->gb, 4);
293  int index = (ctx->cur_index + backref) & 15;
294  uint8_t *p = ctx->frames[index].f->data[0];
295 
296  if (index != ctx->cur_index && p) {
298  cur_row, 0);
299  p += src -
300  ctx->frames[ctx->prev_index].f->data[plane];
301  ctx->hdsp.put_pixels_tab[1][0](dst, p, stride, 8);
302  } else {
303  av_log(ctx->avctx, AV_LOG_ERROR,
304  "No such backreference! Buggy sample.\n");
305  }
306  }
307  } else {
308  ff_thread_await_progress(&ctx->frames[ctx->prev_index],
309  cur_row, 0);
310  ctx->hdsp.put_pixels_tab[1][0](dst, src, stride, 8);
311  }
312  src += 8;
313  dst += 8;
314  }
315  src += (stride - ctx->num_hblocks[plane]) << 3;
316  dst += (stride - ctx->num_hblocks[plane]) << 3;
317 
318  ff_thread_report_progress(&ctx->frames[ctx->cur_index],
319  cur_row++, 0);
320  }
321  }
322 
323  return 0;
324 }
325 
326 /**
327  * Flip the buffer upside-down and put it in the YVU order to revert the
328  * way Mimic encodes frames.
329  */
330 static void flip_swap_frame(AVFrame *f)
331 {
332  int i;
333  uint8_t *data_1 = f->data[1];
334  f->data[0] = f->data[0] + ( f->height - 1) * f->linesize[0];
335  f->data[1] = f->data[2] + ((f->height >> 1) - 1) * f->linesize[2];
336  f->data[2] = data_1 + ((f->height >> 1) - 1) * f->linesize[1];
337  for (i = 0; i < 3; i++)
338  f->linesize[i] *= -1;
339 }
340 
341 static int mimic_decode_frame(AVCodecContext *avctx, AVFrame *rframe,
342  int *got_frame, AVPacket *avpkt)
343 {
344  const uint8_t *buf = avpkt->data;
345  int buf_size = avpkt->size;
346  int swap_buf_size = buf_size - MIMIC_HEADER_SIZE;
347  MimicContext *ctx = avctx->priv_data;
348  GetByteContext gb;
349  int is_pframe;
350  int width, height;
351  int quality, num_coeffs;
352  int res;
353 
354  if (buf_size <= MIMIC_HEADER_SIZE) {
355  av_log(avctx, AV_LOG_ERROR, "insufficient data\n");
356  return AVERROR_INVALIDDATA;
357  }
358 
360  bytestream2_skip(&gb, 2); /* some constant (always 256) */
361  quality = bytestream2_get_le16u(&gb);
362  width = bytestream2_get_le16u(&gb);
363  height = bytestream2_get_le16u(&gb);
364  bytestream2_skip(&gb, 4); /* some constant */
365  is_pframe = bytestream2_get_le32u(&gb);
366  num_coeffs = bytestream2_get_byteu(&gb);
367  bytestream2_skip(&gb, 3); /* some constant */
368 
369  if (!ctx->avctx) {
370  int i;
371 
372  if (!(width == 160 && height == 120) &&
373  !(width == 320 && height == 240)) {
374  av_log(avctx, AV_LOG_ERROR, "invalid width/height!\n");
375  return AVERROR_INVALIDDATA;
376  }
377 
378  res = ff_set_dimensions(avctx, width, height);
379  if (res < 0)
380  return res;
381 
382  ctx->avctx = avctx;
383  avctx->pix_fmt = AV_PIX_FMT_YUV420P;
384  for (i = 0; i < 3; i++) {
385  ctx->num_vblocks[i] = AV_CEIL_RSHIFT(height, 3 + !!i);
386  ctx->num_hblocks[i] = width >> (3 + !!i);
387  }
388  } else if (width != ctx->avctx->width || height != ctx->avctx->height) {
389  avpriv_request_sample(avctx, "Resolution changing");
390  return AVERROR_PATCHWELCOME;
391  }
392 
393  if (is_pframe && !ctx->frames[ctx->prev_index].f->data[0]) {
394  av_log(avctx, AV_LOG_ERROR, "decoding must start with keyframe\n");
395  return AVERROR_INVALIDDATA;
396  }
397 
398  ff_thread_release_ext_buffer(avctx, &ctx->frames[ctx->cur_index]);
399  ctx->frames[ctx->cur_index].f->pict_type = is_pframe ? AV_PICTURE_TYPE_P :
401  if ((res = ff_thread_get_ext_buffer(avctx, &ctx->frames[ctx->cur_index],
403  return res;
404 
405  ctx->next_prev_index = ctx->cur_index;
406  ctx->next_cur_index = (ctx->cur_index - 1) & 15;
407 
408  ff_thread_finish_setup(avctx);
409 
410  av_fast_padded_malloc(&ctx->swap_buf, &ctx->swap_buf_size, swap_buf_size);
411  if (!ctx->swap_buf)
412  return AVERROR(ENOMEM);
413 
414  ctx->bbdsp.bswap_buf(ctx->swap_buf,
415  (const uint32_t *) (buf + MIMIC_HEADER_SIZE),
416  swap_buf_size >> 2);
417  init_get_bits(&ctx->gb, ctx->swap_buf, swap_buf_size << 3);
418 
419  res = decode(ctx, quality, num_coeffs, !is_pframe);
420  ff_thread_report_progress(&ctx->frames[ctx->cur_index], INT_MAX, 0);
421  if (res < 0) {
422  if (!(avctx->active_thread_type & FF_THREAD_FRAME))
423  ff_thread_release_ext_buffer(avctx, &ctx->frames[ctx->cur_index]);
424  return res;
425  }
426 
427  if ((res = av_frame_ref(rframe, ctx->frames[ctx->cur_index].f)) < 0)
428  return res;
429  *got_frame = 1;
430 
431  flip_swap_frame(rframe);
432 
433  ctx->prev_index = ctx->next_prev_index;
434  ctx->cur_index = ctx->next_cur_index;
435 
436  return buf_size;
437 }
438 
440  .p.name = "mimic",
441  CODEC_LONG_NAME("Mimic"),
442  .p.type = AVMEDIA_TYPE_VIDEO,
443  .p.id = AV_CODEC_ID_MIMIC,
444  .priv_data_size = sizeof(MimicContext),
446  .close = mimic_decode_end,
448  .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
449  UPDATE_THREAD_CONTEXT(mimic_decode_update_thread_context),
450  .caps_internal = FF_CODEC_CAP_ALLOCATE_PROGRESS |
452 };
MimicContext::hdsp
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Definition: mimic.c:62
bswapdsp.h
MimicContext::next_prev_index
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Definition: mimic.c:67
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Definition: mimic.c:63
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Definition: common.h:95
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#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
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static const uint8_t huffsyms[]
Definition: mimic.c:72
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#define MIMIC_HEADER_SIZE
Definition: mimic.c:39
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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
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static const uint8_t huffbits[]
Definition: mimic.c:84
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void ff_thread_release_ext_buffer(AVCodecContext *avctx, ThreadFrame *f)
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Definition: pthread_frame.c:1178
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Definition: bytestream.h:33
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void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:116
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This structure describes decoded (raw) audio or video data.
Definition: frame.h:325
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uint8_t * data
Definition: packet.h:374
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Definition: codec_internal.h:119
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static av_cold void mimic_init_static(void)
Definition: mimic.c:121
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Definition: blockdsp.h:32
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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:91
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static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
Definition: get_bits.h:649
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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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av_cold void ff_idctdsp_init(IDCTDSPContext *c, AVCodecContext *avctx)
Definition: idctdsp.c:228
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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
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av_cold void ff_permute_scantable(uint8_t dst[64], const uint8_t src[64], const uint8_t permutation[64])
Definition: idctdsp.c:30
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static av_always_inline void bytestream2_skip(GetByteContext *g, unsigned int size)
Definition: bytestream.h:168
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static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:379
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The public AVCodec.
Definition: codec_internal.h:123
AV_CODEC_ID_MIMIC
@ AV_CODEC_ID_MIMIC
Definition: codec_id.h:165
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Definition: get_bits.h:61
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int flags
AV_CODEC_FLAG_*.
Definition: avcodec.h:478
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Allocate an AVFrame and set its fields to default values.
Definition: frame.c:104
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uint8_t permutated_scantable[64]
Definition: mimic.c:59
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static int ff_thread_once(char *control, void(*routine)(void))
Definition: thread.h:184
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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
ff_thread_report_progress
void ff_thread_report_progress(ThreadFrame *f, int n, int field)
Notify later decoding threads when part of their reference picture is ready.
Definition: pthread_frame.c:624
width
#define width
FF_CODEC_DECODE_CB
#define FF_CODEC_DECODE_CB(func)
Definition: codec_internal.h:298
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:50
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:376
ff_mimic_decoder
const FFCodec ff_mimic_decoder
Definition: mimic.c:439
init
int(* init)(AVBSFContext *ctx)
Definition: dts2pts_bsf.c:363
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:330
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:66
CODEC_LONG_NAME
#define CODEC_LONG_NAME(str)
Definition: codec_internal.h:264
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:885
AV_CODEC_CAP_FRAME_THREADS
#define AV_CODEC_CAP_FRAME_THREADS
Codec supports frame-level multithreading.
Definition: codec.h:113
threadframe.h
AV_ONCE_INIT
#define AV_ONCE_INIT
Definition: thread.h:182
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
INIT_VLC_STATIC_FROM_LENGTHS
#define INIT_VLC_STATIC_FROM_LENGTHS(vlc, bits, nb_codes, lens, len_wrap, symbols, symbols_wrap, symbols_size, offset, flags, static_size)
Definition: vlc.h:131
MimicContext::swap_buf
void * swap_buf
Definition: mimic.c:48
AV_PICTURE_TYPE_I
@ AV_PICTURE_TYPE_I
Intra.
Definition: avutil.h:274
get_bits1
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:498
UPDATE_THREAD_CONTEXT
#define UPDATE_THREAD_CONTEXT(func)
Definition: codec_internal.h:273
block_vlc
static VLC block_vlc
Definition: mimic.c:70
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:787
AVOnce
#define AVOnce
Definition: thread.h:181
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:122
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:375
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:353
codec_internal.h
MimicContext::avctx
AVCodecContext * avctx
Definition: mimic.c:43
for
for(k=2;k<=8;++k)
Definition: h264pred_template.c:425
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:127
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:1477
DECLARE_ALIGNED
#define DECLARE_ALIGNED(n, t, v)
Definition: mem.h:116
MimicContext::num_hblocks
int num_hblocks[3]
Definition: mimic.c:46
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:269
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:259
vlcdec_lookup
static const int8_t vlcdec_lookup[9][64]
Definition: mimic.c:178
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:49
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:211
AVCodecContext::pix_fmt
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:608
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:1080
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:215
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:341
pos
unsigned int pos
Definition: spdifenc.c:412
IDCTDSPContext
Definition: idctdsp.h:44
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:398
AVCodecContext::active_thread_type
int active_thread_type
Which multithreading methods are in use by the codec.
Definition: avcodec.h:1485
ThreadFrame
Definition: threadframe.h:27
MimicContext
Definition: mimic.c:42
VLC
Definition: vlc.h:31
MimicContext::frames
ThreadFrame frames[16]
Definition: mimic.c:54
VLC::table
VLCElem * table
Definition: vlc.h:33
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:275
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
AVPacket
This structure stores compressed data.
Definition: packet.h:351
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:425
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:78
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