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 <stdlib.h>
23 #include <string.h>
24 #include <stdint.h>
25 
26 #include "avcodec.h"
27 #include "blockdsp.h"
28 #include "internal.h"
29 #include "get_bits.h"
30 #include "bytestream.h"
31 #include "bswapdsp.h"
32 #include "hpeldsp.h"
33 #include "idctdsp.h"
34 #include "thread.h"
35 
36 #define MIMIC_HEADER_SIZE 20
37 
38 typedef struct MimicContext {
40 
41  int num_vblocks[3];
42  int num_hblocks[3];
43 
44  void *swap_buf;
46 
47  int cur_index;
49 
51 
52  DECLARE_ALIGNED(32, int16_t, dct_block)[64];
53 
61 
62  /* Kept in the context so multithreading can have a constant to read from */
65 } MimicContext;
66 
67 static const uint32_t huffcodes[] = {
68  0x0000000a, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
69  0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
70  0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x0000000b,
71  0x0000001b, 0x00000038, 0x00000078, 0x00000079, 0x0000007a, 0x000000f9,
72  0x000000fa, 0x000003fb, 0x000007f8, 0x000007f9, 0x000007fa, 0x000007fb,
73  0x00000ff8, 0x00000ff9, 0x00000001, 0x00000039, 0x0000007b, 0x000000fb,
74  0x000001f8, 0x000001f9, 0x00000ffa, 0x00000ffb, 0x00001ff8, 0x00001ff9,
75  0x00001ffa, 0x00001ffb, 0x00003ff8, 0x00003ff9, 0x00003ffa, 0x00000000,
76  0x00000004, 0x0000003a, 0x000001fa, 0x00003ffb, 0x00007ff8, 0x00007ff9,
77  0x00007ffa, 0x00007ffb, 0x0000fff8, 0x0000fff9, 0x0000fffa, 0x0000fffb,
78  0x0001fff8, 0x0001fff9, 0x0001fffa, 0x00000000, 0x0000000c, 0x000000f8,
79  0x000001fb, 0x0001fffb, 0x0003fff8, 0x0003fff9, 0x0003fffa, 0x0003fffb,
80  0x0007fff8, 0x0007fff9, 0x0007fffa, 0x0007fffb, 0x000ffff8, 0x000ffff9,
81  0x000ffffa, 0x00000000, 0x0000001a, 0x000003f8, 0x000ffffb, 0x001ffff8,
82  0x001ffff9, 0x001ffffa, 0x001ffffb, 0x003ffff8, 0x003ffff9, 0x003ffffa,
83  0x003ffffb, 0x007ffff8, 0x007ffff9, 0x007ffffa, 0x007ffffb, 0x00000000,
84  0x0000003b, 0x000003f9, 0x00fffff8, 0x00fffff9, 0x00fffffa, 0x00fffffb,
85  0x01fffff8, 0x01fffff9, 0x01fffffa, 0x01fffffb, 0x03fffff8, 0x03fffff9,
86  0x03fffffa, 0x03fffffb, 0x07fffff8, 0x00000000, 0x000003fa, 0x07fffff9,
87  0x07fffffa, 0x07fffffb, 0x0ffffff8, 0x0ffffff9, 0x0ffffffa, 0x0ffffffb,
88  0x1ffffff8, 0x1ffffff9, 0x1ffffffa, 0x1ffffffb, 0x3ffffff8, 0x3ffffff9,
89  0x3ffffffa,
90 };
91 
92 static const uint8_t huffbits[] = {
93  4, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
94  0, 0, 0, 0, 2, 4, 5, 6, 7, 7, 7, 8,
95  8, 10, 11, 11, 11, 11, 12, 12, 2, 6, 7, 8,
96  9, 9, 12, 12, 13, 13, 13, 13, 14, 14, 14, 0,
97  3, 6, 9, 14, 15, 15, 15, 15, 16, 16, 16, 16,
98  17, 17, 17, 0, 4, 8, 9, 17, 18, 18, 18, 18,
99  19, 19, 19, 19, 20, 20, 20, 0, 5, 10, 20, 21,
100  21, 21, 21, 22, 22, 22, 22, 23, 23, 23, 23, 0,
101  6, 10, 24, 24, 24, 24, 25, 25, 25, 25, 26, 26,
102  26, 26, 27, 0, 10, 27, 27, 27, 28, 28, 28, 28,
103  29, 29, 29, 29, 30, 30, 30,
104 };
105 
106 static const uint8_t col_zag[64] = {
107  0, 8, 1, 2, 9, 16, 24, 17,
108  10, 3, 4, 11, 18, 25, 32, 40,
109  33, 26, 19, 12, 5, 6, 13, 20,
110  27, 34, 41, 48, 56, 49, 42, 35,
111  28, 21, 14, 7, 15, 22, 29, 36,
112  43, 50, 57, 58, 51, 44, 37, 30,
113  23, 31, 38, 45, 52, 59, 39, 46,
114  53, 60, 61, 54, 47, 55, 62, 63,
115 };
116 
118 {
119  MimicContext *ctx = avctx->priv_data;
120  int i;
121 
122  av_freep(&ctx->swap_buf);
123  ctx->swap_buf_size = 0;
124 
125  for (i = 0; i < FF_ARRAY_ELEMS(ctx->frames); i++) {
126  if (ctx->frames[i].f)
127  ff_thread_release_buffer(avctx, &ctx->frames[i]);
128  av_frame_free(&ctx->frames[i].f);
129  }
130 
131  ff_free_vlc(&ctx->vlc);
132 
133  return 0;
134 }
135 
137 {
138  MimicContext *ctx = avctx->priv_data;
139  int ret, i;
140 
141  ctx->prev_index = 0;
142  ctx->cur_index = 15;
143 
144  if ((ret = init_vlc(&ctx->vlc, 11, FF_ARRAY_ELEMS(huffbits),
145  huffbits, 1, 1, huffcodes, 4, 4, 0)) < 0) {
146  av_log(avctx, AV_LOG_ERROR, "error initializing vlc table\n");
147  return ret;
148  }
149  ff_blockdsp_init(&ctx->bdsp, avctx);
150  ff_bswapdsp_init(&ctx->bbdsp);
151  ff_hpeldsp_init(&ctx->hdsp, avctx->flags);
152  ff_idctdsp_init(&ctx->idsp, avctx);
154 
155  for (i = 0; i < FF_ARRAY_ELEMS(ctx->frames); i++) {
156  ctx->frames[i].f = av_frame_alloc();
157  if (!ctx->frames[i].f) {
158  mimic_decode_end(avctx);
159  return AVERROR(ENOMEM);
160  }
161  }
162 
163  return 0;
164 }
165 
166 #if HAVE_THREADS
167 static int mimic_decode_update_thread_context(AVCodecContext *avctx, const AVCodecContext *avctx_from)
168 {
169  MimicContext *dst = avctx->priv_data, *src = avctx_from->priv_data;
170  int i, ret;
171 
172  if (avctx == avctx_from)
173  return 0;
174 
175  dst->cur_index = src->next_cur_index;
176  dst->prev_index = src->next_prev_index;
177 
178  for (i = 0; i < FF_ARRAY_ELEMS(dst->frames); i++) {
179  ff_thread_release_buffer(avctx, &dst->frames[i]);
180  if (i != src->next_cur_index && src->frames[i].f->data[0]) {
181  ret = ff_thread_ref_frame(&dst->frames[i], &src->frames[i]);
182  if (ret < 0)
183  return ret;
184  }
185  }
186 
187  return 0;
188 }
189 #endif
190 
191 static const int8_t vlcdec_lookup[9][64] = {
192  { 0, },
193  { -1, 1, },
194  { -3, 3, -2, 2, },
195  { -7, 7, -6, 6, -5, 5, -4, 4, },
196  { -15, 15, -14, 14, -13, 13, -12, 12,
197  -11, 11, -10, 10, -9, 9, -8, 8, },
198  { -31, 31, -30, 30, -29, 29, -28, 28,
199  -27, 27, -26, 26, -25, 25, -24, 24,
200  -23, 23, -22, 22, -21, 21, -20, 20,
201  -19, 19, -18, 18, -17, 17, -16, 16, },
202  { -63, 63, -62, 62, -61, 61, -60, 60,
203  -59, 59, -58, 58, -57, 57, -56, 56,
204  -55, 55, -54, 54, -53, 53, -52, 52,
205  -51, 51, -50, 50, -49, 49, -48, 48,
206  -47, 47, -46, 46, -45, 45, -44, 44,
207  -43, 43, -42, 42, -41, 41, -40, 40,
208  -39, 39, -38, 38, -37, 37, -36, 36,
209  -35, 35, -34, 34, -33, 33, -32, 32, },
210  { -127, 127, -126, 126, -125, 125, -124, 124,
211  -123, 123, -122, 122, -121, 121, -120, 120,
212  -119, 119, -118, 118, -117, 117, -116, 116,
213  -115, 115, -114, 114, -113, 113, -112, 112,
214  -111, 111, -110, 110, -109, 109, -108, 108,
215  -107, 107, -106, 106, -105, 105, -104, 104,
216  -103, 103, -102, 102, -101, 101, -100, 100,
217  -99, 99, -98, 98, -97, 97, -96, 96, },
218  { -95, 95, -94, 94, -93, 93, -92, 92,
219  -91, 91, -90, 90, -89, 89, -88, 88,
220  -87, 87, -86, 86, -85, 85, -84, 84,
221  -83, 83, -82, 82, -81, 81, -80, 80,
222  -79, 79, -78, 78, -77, 77, -76, 76,
223  -75, 75, -74, 74, -73, 73, -72, 72,
224  -71, 71, -70, 70, -69, 69, -68, 68,
225  -67, 67, -66, 66, -65, 65, -64, 64, },
226 };
227 
228 static int vlc_decode_block(MimicContext *ctx, int num_coeffs, int qscale)
229 {
230  int16_t *block = ctx->dct_block;
231  unsigned int pos;
232 
233  ctx->bdsp.clear_block(block);
234 
235  block[0] = get_bits(&ctx->gb, 8) << 3;
236 
237  for (pos = 1; pos < num_coeffs; pos++) {
238  uint32_t vlc, num_bits;
239  int value;
240  int coeff;
241 
242  vlc = get_vlc2(&ctx->gb, ctx->vlc.table, ctx->vlc.bits, 3);
243  if (!vlc) /* end-of-block code */
244  return 0;
245  if (vlc == -1)
246  return AVERROR_INVALIDDATA;
247 
248  /* pos_add and num_bits are coded in the vlc code */
249  pos += vlc & 15; // pos_add
250  num_bits = vlc >> 4; // num_bits
251 
252  if (pos >= 64)
253  return AVERROR_INVALIDDATA;
254 
255  value = get_bits(&ctx->gb, num_bits);
256 
257  /* FFmpeg's IDCT behaves somewhat different from the original code, so
258  * a factor of 4 was added to the input */
259 
260  coeff = ((int8_t*)vlcdec_lookup[num_bits])[value];
261  if (pos < 3)
262  coeff *= 16;
263  else /* TODO Use >> 10 instead of / 1001 */
264  coeff = (coeff * qscale) / 1001;
265 
266  block[ctx->scantable.permutated[pos]] = coeff;
267  }
268 
269  return 0;
270 }
271 
272 static int decode(MimicContext *ctx, int quality, int num_coeffs,
273  int is_iframe)
274 {
275  int ret, y, x, plane, cur_row = 0;
276 
277  for (plane = 0; plane < 3; plane++) {
278  const int is_chroma = !!plane;
279  const int qscale = av_clip(10000 - quality, is_chroma ? 1000 : 2000,
280  10000) << 2;
281  const int stride = ctx->frames[ctx->cur_index ].f->linesize[plane];
282  const uint8_t *src = ctx->frames[ctx->prev_index].f->data[plane];
283  uint8_t *dst = ctx->frames[ctx->cur_index ].f->data[plane];
284 
285  for (y = 0; y < ctx->num_vblocks[plane]; y++) {
286  for (x = 0; x < ctx->num_hblocks[plane]; x++) {
287  /* Check for a change condition in the current block.
288  * - iframes always change.
289  * - Luma plane changes on get_bits1 == 0
290  * - Chroma planes change on get_bits1 == 1 */
291  if (is_iframe || get_bits1(&ctx->gb) == is_chroma) {
292  /* Luma planes may use a backreference from the 15 last
293  * frames preceding the previous. (get_bits1 == 1)
294  * Chroma planes don't use backreferences. */
295  if (is_chroma || is_iframe || !get_bits1(&ctx->gb)) {
296  if ((ret = vlc_decode_block(ctx, num_coeffs,
297  qscale)) < 0) {
298  av_log(ctx->avctx, AV_LOG_ERROR, "Error decoding "
299  "block.\n");
300  return ret;
301  }
302  ctx->idsp.idct_put(dst, stride, ctx->dct_block);
303  } else {
304  unsigned int backref = get_bits(&ctx->gb, 4);
305  int index = (ctx->cur_index + backref) & 15;
306  uint8_t *p = ctx->frames[index].f->data[0];
307 
308  if (index != ctx->cur_index && p) {
309  ff_thread_await_progress(&ctx->frames[index],
310  cur_row, 0);
311  p += src -
312  ctx->frames[ctx->prev_index].f->data[plane];
313  ctx->hdsp.put_pixels_tab[1][0](dst, p, stride, 8);
314  } else {
315  av_log(ctx->avctx, AV_LOG_ERROR,
316  "No such backreference! Buggy sample.\n");
317  }
318  }
319  } else {
321  cur_row, 0);
322  ctx->hdsp.put_pixels_tab[1][0](dst, src, stride, 8);
323  }
324  src += 8;
325  dst += 8;
326  }
327  src += (stride - ctx->num_hblocks[plane]) << 3;
328  dst += (stride - ctx->num_hblocks[plane]) << 3;
329 
331  cur_row++, 0);
332  }
333  }
334 
335  return 0;
336 }
337 
338 /**
339  * Flip the buffer upside-down and put it in the YVU order to revert the
340  * way Mimic encodes frames.
341  */
342 static void flip_swap_frame(AVFrame *f)
343 {
344  int i;
345  uint8_t *data_1 = f->data[1];
346  f->data[0] = f->data[0] + ( f->height - 1) * f->linesize[0];
347  f->data[1] = f->data[2] + ((f->height >> 1) - 1) * f->linesize[2];
348  f->data[2] = data_1 + ((f->height >> 1) - 1) * f->linesize[1];
349  for (i = 0; i < 3; i++)
350  f->linesize[i] *= -1;
351 }
352 
353 static int mimic_decode_frame(AVCodecContext *avctx, void *data,
354  int *got_frame, AVPacket *avpkt)
355 {
356  const uint8_t *buf = avpkt->data;
357  int buf_size = avpkt->size;
358  int swap_buf_size = buf_size - MIMIC_HEADER_SIZE;
359  MimicContext *ctx = avctx->priv_data;
361  int is_pframe;
362  int width, height;
363  int quality, num_coeffs;
364  int res;
365 
366  if (buf_size <= MIMIC_HEADER_SIZE) {
367  av_log(avctx, AV_LOG_ERROR, "insufficient data\n");
368  return AVERROR_INVALIDDATA;
369  }
370 
371  bytestream2_init(&gb, buf, MIMIC_HEADER_SIZE);
372  bytestream2_skip(&gb, 2); /* some constant (always 256) */
373  quality = bytestream2_get_le16u(&gb);
374  width = bytestream2_get_le16u(&gb);
375  height = bytestream2_get_le16u(&gb);
376  bytestream2_skip(&gb, 4); /* some constant */
377  is_pframe = bytestream2_get_le32u(&gb);
378  num_coeffs = bytestream2_get_byteu(&gb);
379  bytestream2_skip(&gb, 3); /* some constant */
380 
381  if (!ctx->avctx) {
382  int i;
383 
384  if (!(width == 160 && height == 120) &&
385  !(width == 320 && height == 240)) {
386  av_log(avctx, AV_LOG_ERROR, "invalid width/height!\n");
387  return AVERROR_INVALIDDATA;
388  }
389 
390  res = ff_set_dimensions(avctx, width, height);
391  if (res < 0)
392  return res;
393 
394  ctx->avctx = avctx;
395  avctx->pix_fmt = AV_PIX_FMT_YUV420P;
396  for (i = 0; i < 3; i++) {
397  ctx->num_vblocks[i] = AV_CEIL_RSHIFT(height, 3 + !!i);
398  ctx->num_hblocks[i] = width >> (3 + !!i);
399  }
400  } else if (width != ctx->avctx->width || height != ctx->avctx->height) {
401  avpriv_request_sample(avctx, "Resolution changing");
402  return AVERROR_PATCHWELCOME;
403  }
404 
405  if (is_pframe && !ctx->frames[ctx->prev_index].f->data[0]) {
406  av_log(avctx, AV_LOG_ERROR, "decoding must start with keyframe\n");
407  return AVERROR_INVALIDDATA;
408  }
409 
410  ff_thread_release_buffer(avctx, &ctx->frames[ctx->cur_index]);
411  ctx->frames[ctx->cur_index].f->pict_type = is_pframe ? AV_PICTURE_TYPE_P :
413  if ((res = ff_thread_get_buffer(avctx, &ctx->frames[ctx->cur_index],
415  return res;
416 
417  ctx->next_prev_index = ctx->cur_index;
418  ctx->next_cur_index = (ctx->cur_index - 1) & 15;
419 
420  ff_thread_finish_setup(avctx);
421 
422  av_fast_padded_malloc(&ctx->swap_buf, &ctx->swap_buf_size, swap_buf_size);
423  if (!ctx->swap_buf)
424  return AVERROR(ENOMEM);
425 
426  ctx->bbdsp.bswap_buf(ctx->swap_buf,
427  (const uint32_t *) (buf + MIMIC_HEADER_SIZE),
428  swap_buf_size >> 2);
429  init_get_bits(&ctx->gb, ctx->swap_buf, swap_buf_size << 3);
430 
431  res = decode(ctx, quality, num_coeffs, !is_pframe);
432  ff_thread_report_progress(&ctx->frames[ctx->cur_index], INT_MAX, 0);
433  if (res < 0) {
434  if (!(avctx->active_thread_type & FF_THREAD_FRAME))
435  ff_thread_release_buffer(avctx, &ctx->frames[ctx->cur_index]);
436  return res;
437  }
438 
439  if ((res = av_frame_ref(data, ctx->frames[ctx->cur_index].f)) < 0)
440  return res;
441  *got_frame = 1;
442 
443  flip_swap_frame(data);
444 
445  ctx->prev_index = ctx->next_prev_index;
446  ctx->cur_index = ctx->next_cur_index;
447 
448  return buf_size;
449 }
450 
452  .name = "mimic",
453  .long_name = NULL_IF_CONFIG_SMALL("Mimic"),
454  .type = AVMEDIA_TYPE_VIDEO,
455  .id = AV_CODEC_ID_MIMIC,
456  .priv_data_size = sizeof(MimicContext),
458  .close = mimic_decode_end,
461  .update_thread_context = ONLY_IF_THREADS_ENABLED(mimic_decode_update_thread_context),
462  .caps_internal = FF_CODEC_CAP_ALLOCATE_PROGRESS,
463 };
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
static const uint8_t col_zag[64]
Definition: mimic.c:106
This structure describes decoded (raw) audio or video data.
Definition: frame.h:308
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:100
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:379
AVFrame * f
Definition: thread.h:35
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:106
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
int next_cur_index
Definition: mimic.c:63
void(* clear_block)(int16_t *block)
Definition: blockdsp.h:36
ScanTable scantable
Definition: mimic.c:55
#define avpriv_request_sample(...)
Scantable.
Definition: idctdsp.h:31
int size
Definition: packet.h:364
av_cold void ff_blockdsp_init(BlockDSPContext *c, AVCodecContext *avctx)
Definition: blockdsp.c:60
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:736
static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)
Definition: bytestream.h:133
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:72
uint8_t permutated[64]
Definition: idctdsp.h:33
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
int prev_index
Definition: mimic.c:48
AVCodec.
Definition: codec.h:190
static int decode(MimicContext *ctx, int quality, int num_coeffs, int is_iframe)
Definition: mimic.c:272
The exact code depends on how similar the blocks are and how related they are to the block
uint8_t
IDCTDSPContext idsp
Definition: mimic.c:59
#define av_cold
Definition: attributes.h:88
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:190
void(* bswap_buf)(uint32_t *dst, const uint32_t *src, int w)
Definition: bswapdsp.h:25
#define f(width, name)
Definition: cbs_vp9.c:255
Multithreading support functions.
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:456
#define DECLARE_ALIGNED(n, t, v)
Declare a variable that is aligned in memory.
Definition: mem.h:112
#define height
uint8_t * data
Definition: packet.h:363
GetBitContext gb
Definition: mimic.c:54
bitstream reader API header.
ThreadFrame frames[16]
Definition: mimic.c:50
#define av_log(a,...)
#define FF_CODEC_CAP_ALLOCATE_PROGRESS
Definition: internal.h:75
#define src
Definition: vp8dsp.c:254
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:194
void ff_thread_release_buffer(AVCodecContext *avctx, ThreadFrame *f)
Wrapper around release_buffer() frame-for multithreaded codecs.
#define init_vlc(vlc, nb_bits, nb_codes,bits, bits_wrap, bits_size,codes, codes_wrap, codes_size,flags)
Definition: vlc.h:38
static av_always_inline void bytestream2_skip(GetByteContext *g, unsigned int size)
Definition: bytestream.h:164
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:203
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:153
int active_thread_type
Which multithreading methods are in use by the codec.
Definition: avcodec.h:1804
unsigned int pos
Definition: spdifenc.c:410
BswapDSPContext bbdsp
Definition: mimic.c:57
int flags
AV_CODEC_FLAG_*.
Definition: avcodec.h:606
const char * name
Name of the codec implementation.
Definition: codec.h:197
#define AV_CODEC_CAP_FRAME_THREADS
Codec supports frame-level multithreading.
Definition: codec.h:106
static const int8_t vlcdec_lookup[9][64]
Definition: mimic.c:191
Definition: vlc.h:26
static int vlc_decode_block(MimicContext *ctx, int num_coeffs, int qscale)
Definition: mimic.c:228
#define ONLY_IF_THREADS_ENABLED(x)
Define a function with only the non-default version specified.
Definition: internal.h:192
av_cold void ff_hpeldsp_init(HpelDSPContext *c, int flags)
Definition: hpeldsp.c:338
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 have so the codec calls ff_thread_report set FF_CODEC_CAP_ALLOCATE_PROGRESS in AVCodec caps_internal and use ff_thread_get_buffer() to allocate frames.The frames must then be freed with ff_thread_release_buffer().Otherwise decode directly into the user-supplied frames.Call ff_thread_report_progress() after some part of the current picture has decoded.A good place to put this is where draw_horiz_band() is called-add this if it isn't called anywhere
Half-pel DSP context.
Definition: hpeldsp.h:45
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:391
#define FF_THREAD_FRAME
Decode more than one frame at once.
Definition: avcodec.h:1796
static av_cold int mimic_decode_end(AVCodecContext *avctx)
Definition: mimic.c:117
#define width
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
int width
picture width / height.
Definition: avcodec.h:699
void ff_thread_report_progress(ThreadFrame *f, int n, int field)
Notify later decoding threads when part of their reference picture is ready.
AVFormatContext * ctx
Definition: movenc.c:48
trying all byte sequences megabyte in length and selecting the best looking sequence will yield cases to try But a word about quality
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
uint8_t idct_permutation[64]
IDCT input permutation.
Definition: idctdsp.h:96
static const uint8_t huffbits[]
Definition: mimic.c:92
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
#define FF_ARRAY_ELEMS(a)
int ff_thread_ref_frame(ThreadFrame *dst, const ThreadFrame *src)
Definition: utils.c:1858
int bits
Definition: vlc.h:27
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:62
static av_cold int mimic_decode_init(AVCodecContext *avctx)
Definition: mimic.c:136
Half-pel DSP functions.
Libavcodec external API header.
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:339
int16_t dct_block[64]
Definition: mimic.c:52
main external API structure.
Definition: avcodec.h:526
op_pixels_func put_pixels_tab[4][4]
Halfpel motion compensation with rounding (a+b+1)>>1.
Definition: hpeldsp.h:56
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 have update_thread_context() run it in the next thread.Add AV_CODEC_CAP_FRAME_THREADS to the codec capabilities.There will be very little speed gain at this point but it should work.If there are inter-frame dependencies
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:342
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:498
int cur_index
Definition: mimic.c:47
int index
Definition: gxfenc.c:89
AVCodecContext * avctx
Definition: mimic.c:39
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
Definition: get_bits.h:659
int next_prev_index
Definition: mimic.c:64
static const uint32_t huffcodes[]
Definition: mimic.c:67
int num_vblocks[3]
Definition: mimic.c:41
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:322
GLint GLenum GLboolean GLsizei stride
Definition: opengl_enc.c:104
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:66
common internal api header.
AVCodec ff_mimic_decoder
Definition: mimic.c:451
static int mimic_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: mimic.c:353
av_cold void ff_bswapdsp_init(BswapDSPContext *c)
Definition: bswapdsp.c:49
void * priv_data
Definition: avcodec.h:553
#define MIMIC_HEADER_SIZE
Definition: mimic.c:36
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
VLC_TYPE(* table)[2]
code, bits
Definition: vlc.h:28
VLC vlc
Definition: mimic.c:60
static const double coeff[2][5]
Definition: vf_owdenoise.c:72
int swap_buf_size
Definition: mimic.c:45
int height
Definition: frame.h:366
#define av_freep(p)
#define stride
BlockDSPContext bdsp
Definition: mimic.c:56
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
void * swap_buf
Definition: mimic.c:44
This structure stores compressed data.
Definition: packet.h:340
void ff_free_vlc(VLC *vlc)
Definition: bitstream.c:358
#define AV_GET_BUFFER_FLAG_REF
The decoder will keep a reference to the frame and may reuse it later.
Definition: avcodec.h:509
int num_hblocks[3]
Definition: mimic.c:42
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: codec.h:50
for(j=16;j >0;--j)
HpelDSPContext hdsp
Definition: mimic.c:58
int i
Definition: input.c:407
Predicted.
Definition: avutil.h:275
#define AV_CEIL_RSHIFT(a, b)
Definition: common.h:58