FFmpeg  2.1.1
g2meet.c
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1 /*
2  * Go2Webinar decoder
3  * Copyright (c) 2012 Konstantin Shishkov
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 /**
23  * @file
24  * Go2Webinar decoder
25  */
26 
27 #include <zlib.h>
28 
29 #include "libavutil/intreadwrite.h"
30 #include "avcodec.h"
31 #include "bytestream.h"
32 #include "dsputil.h"
33 #include "get_bits.h"
34 #include "internal.h"
35 #include "mjpeg.h"
36 
37 enum ChunkType {
38  FRAME_INFO = 0xC8,
44 };
45 
49 };
50 
51 static const uint8_t luma_quant[64] = {
52  8, 6, 5, 8, 12, 20, 26, 31,
53  6, 6, 7, 10, 13, 29, 30, 28,
54  7, 7, 8, 12, 20, 29, 35, 28,
55  7, 9, 11, 15, 26, 44, 40, 31,
56  9, 11, 19, 28, 34, 55, 52, 39,
57  12, 18, 28, 32, 41, 52, 57, 46,
58  25, 32, 39, 44, 52, 61, 60, 51,
59  36, 46, 48, 49, 56, 50, 52, 50
60 };
61 
62 static const uint8_t chroma_quant[64] = {
63  9, 9, 12, 24, 50, 50, 50, 50,
64  9, 11, 13, 33, 50, 50, 50, 50,
65  12, 13, 28, 50, 50, 50, 50, 50,
66  24, 33, 50, 50, 50, 50, 50, 50,
67  50, 50, 50, 50, 50, 50, 50, 50,
68  50, 50, 50, 50, 50, 50, 50, 50,
69  50, 50, 50, 50, 50, 50, 50, 50,
70  50, 50, 50, 50, 50, 50, 50, 50,
71 };
72 
73 typedef struct JPGContext {
76 
77  VLC dc_vlc[2], ac_vlc[2];
78  int prev_dc[3];
79  DECLARE_ALIGNED(16, int16_t, block)[6][64];
80 
82 } JPGContext;
83 
84 typedef struct G2MContext {
86  int version;
87 
89  int width, height, bpp;
92 
94 
97 
100 
102 
108 } G2MContext;
109 
110 static av_cold int build_vlc(VLC *vlc, const uint8_t *bits_table,
111  const uint8_t *val_table, int nb_codes,
112  int is_ac)
113 {
114  uint8_t huff_size[256] = { 0 };
115  uint16_t huff_code[256];
116  uint16_t huff_sym[256];
117  int i;
118 
119  ff_mjpeg_build_huffman_codes(huff_size, huff_code, bits_table, val_table);
120 
121  for (i = 0; i < 256; i++)
122  huff_sym[i] = i + 16 * is_ac;
123 
124  if (is_ac)
125  huff_sym[0] = 16 * 256;
126 
127  return ff_init_vlc_sparse(vlc, 9, nb_codes, huff_size, 1, 1,
128  huff_code, 2, 2, huff_sym, 2, 2, 0);
129 }
130 
132 {
133  int ret;
134 
136  avpriv_mjpeg_val_dc, 12, 0);
137  if (ret)
138  return ret;
140  avpriv_mjpeg_val_dc, 12, 0);
141  if (ret)
142  return ret;
145  if (ret)
146  return ret;
149  if (ret)
150  return ret;
151 
152  ff_dsputil_init(&c->dsp, avctx);
155 
156  return 0;
157 }
158 
160 {
161  int i;
162 
163  for (i = 0; i < 2; i++) {
164  ff_free_vlc(&ctx->dc_vlc[i]);
165  ff_free_vlc(&ctx->ac_vlc[i]);
166  }
167 
168  av_freep(&ctx->buf);
169 }
170 
171 static void jpg_unescape(const uint8_t *src, int src_size,
172  uint8_t *dst, int *dst_size)
173 {
174  const uint8_t *src_end = src + src_size;
175  uint8_t *dst_start = dst;
176 
177  while (src < src_end) {
178  uint8_t x = *src++;
179 
180  *dst++ = x;
181 
182  if (x == 0xFF && !*src)
183  src++;
184  }
185  *dst_size = dst - dst_start;
186 }
187 
189  int plane, int16_t *block)
190 {
191  int dc, val, pos;
192  const int is_chroma = !!plane;
193  const uint8_t *qmat = is_chroma ? chroma_quant : luma_quant;
194 
195  c->dsp.clear_block(block);
196  dc = get_vlc2(gb, c->dc_vlc[is_chroma].table, 9, 3);
197  if (dc < 0)
198  return AVERROR_INVALIDDATA;
199  if (dc)
200  dc = get_xbits(gb, dc);
201  dc = dc * qmat[0] + c->prev_dc[plane];
202  block[0] = dc;
203  c->prev_dc[plane] = dc;
204 
205  pos = 0;
206  while (pos < 63) {
207  val = get_vlc2(gb, c->ac_vlc[is_chroma].table, 9, 3);
208  if (val < 0)
209  return AVERROR_INVALIDDATA;
210  pos += val >> 4;
211  val &= 0xF;
212  if (pos > 63)
213  return val ? AVERROR_INVALIDDATA : 0;
214  if (val) {
215  int nbits = val;
216 
217  val = get_xbits(gb, nbits);
218  val *= qmat[ff_zigzag_direct[pos]];
219  block[c->scantable.permutated[pos]] = val;
220  }
221  }
222  return 0;
223 }
224 
225 static inline void yuv2rgb(uint8_t *out, int Y, int U, int V)
226 {
227  out[0] = av_clip_uint8(Y + ( 91881 * V + 32768 >> 16));
228  out[1] = av_clip_uint8(Y + (-22554 * U - 46802 * V + 32768 >> 16));
229  out[2] = av_clip_uint8(Y + (116130 * U + 32768 >> 16));
230 }
231 
232 static int jpg_decode_data(JPGContext *c, int width, int height,
233  const uint8_t *src, int src_size,
234  uint8_t *dst, int dst_stride,
235  const uint8_t *mask, int mask_stride, int num_mbs,
236  int swapuv)
237 {
238  GetBitContext gb;
239  uint8_t *tmp;
240  int mb_w, mb_h, mb_x, mb_y, i, j;
241  int bx, by;
242  int unesc_size;
243  int ret;
244 
245  tmp = av_realloc(c->buf, src_size + FF_INPUT_BUFFER_PADDING_SIZE);
246  if (!tmp)
247  return AVERROR(ENOMEM);
248  c->buf = tmp;
249  jpg_unescape(src, src_size, c->buf, &unesc_size);
250  memset(c->buf + unesc_size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
251  init_get_bits(&gb, c->buf, unesc_size * 8);
252 
253  width = FFALIGN(width, 16);
254  mb_w = width >> 4;
255  mb_h = (height + 15) >> 4;
256 
257  if (!num_mbs)
258  num_mbs = mb_w * mb_h;
259 
260  for (i = 0; i < 3; i++)
261  c->prev_dc[i] = 1024;
262  bx = by = 0;
263  for (mb_y = 0; mb_y < mb_h; mb_y++) {
264  for (mb_x = 0; mb_x < mb_w; mb_x++) {
265  if (mask && !mask[mb_x]) {
266  bx += 16;
267  continue;
268  }
269  for (j = 0; j < 2; j++) {
270  for (i = 0; i < 2; i++) {
271  if ((ret = jpg_decode_block(c, &gb, 0,
272  c->block[i + j * 2])) != 0)
273  return ret;
274  c->dsp.idct(c->block[i + j * 2]);
275  }
276  }
277  for (i = 1; i < 3; i++) {
278  if ((ret = jpg_decode_block(c, &gb, i, c->block[i + 3])) != 0)
279  return ret;
280  c->dsp.idct(c->block[i + 3]);
281  }
282 
283  for (j = 0; j < 16; j++) {
284  uint8_t *out = dst + bx * 3 + (by + j) * dst_stride;
285  for (i = 0; i < 16; i++) {
286  int Y, U, V;
287 
288  Y = c->block[(j >> 3) * 2 + (i >> 3)][(i & 7) + (j & 7) * 8];
289  U = c->block[4 ^ swapuv][(i >> 1) + (j >> 1) * 8] - 128;
290  V = c->block[5 ^ swapuv][(i >> 1) + (j >> 1) * 8] - 128;
291  yuv2rgb(out + i * 3, Y, U, V);
292  }
293  }
294 
295  if (!--num_mbs)
296  return 0;
297  bx += 16;
298  }
299  bx = 0;
300  by += 16;
301  if (mask)
302  mask += mask_stride;
303  }
304 
305  return 0;
306 }
307 
308 static void kempf_restore_buf(const uint8_t *src, int len,
309  uint8_t *dst, int stride,
310  const uint8_t *jpeg_tile, int tile_stride,
311  int width, int height,
312  const uint8_t *pal, int npal, int tidx)
313 {
314  GetBitContext gb;
315  int i, j, nb, col;
316 
317  init_get_bits(&gb, src, len * 8);
318 
319  if (npal <= 2) nb = 1;
320  else if (npal <= 4) nb = 2;
321  else if (npal <= 16) nb = 4;
322  else nb = 8;
323 
324  for (j = 0; j < height; j++, dst += stride, jpeg_tile += tile_stride) {
325  if (get_bits(&gb, 8))
326  continue;
327  for (i = 0; i < width; i++) {
328  col = get_bits(&gb, nb);
329  if (col != tidx)
330  memcpy(dst + i * 3, pal + col * 3, 3);
331  else
332  memcpy(dst + i * 3, jpeg_tile + i * 3, 3);
333  }
334  }
335 }
336 
337 static int kempf_decode_tile(G2MContext *c, int tile_x, int tile_y,
338  const uint8_t *src, int src_size)
339 {
340  int width, height;
341  int hdr, zsize, npal, tidx = -1, ret;
342  int i, j;
343  const uint8_t *src_end = src + src_size;
344  uint8_t pal[768], transp[3];
345  uLongf dlen = (c->tile_width + 1) * c->tile_height;
346  int sub_type;
347  int nblocks, cblocks, bstride;
348  int bits, bitbuf, coded;
349  uint8_t *dst = c->framebuf + tile_x * c->tile_width * 3 +
350  tile_y * c->tile_height * c->framebuf_stride;
351 
352  if (src_size < 2)
353  return AVERROR_INVALIDDATA;
354 
355  width = FFMIN(c->width - tile_x * c->tile_width, c->tile_width);
356  height = FFMIN(c->height - tile_y * c->tile_height, c->tile_height);
357 
358  hdr = *src++;
359  sub_type = hdr >> 5;
360  if (sub_type == 0) {
361  int j;
362  memcpy(transp, src, 3);
363  src += 3;
364  for (j = 0; j < height; j++, dst += c->framebuf_stride)
365  for (i = 0; i < width; i++)
366  memcpy(dst + i * 3, transp, 3);
367  return 0;
368  } else if (sub_type == 1) {
369  return jpg_decode_data(&c->jc, width, height, src, src_end - src,
370  dst, c->framebuf_stride, NULL, 0, 0, 0);
371  }
372 
373  if (sub_type != 2) {
374  memcpy(transp, src, 3);
375  src += 3;
376  }
377  npal = *src++ + 1;
378  memcpy(pal, src, npal * 3); src += npal * 3;
379  if (sub_type != 2) {
380  for (i = 0; i < npal; i++) {
381  if (!memcmp(pal + i * 3, transp, 3)) {
382  tidx = i;
383  break;
384  }
385  }
386  }
387 
388  if (src_end - src < 2)
389  return 0;
390  zsize = (src[0] << 8) | src[1]; src += 2;
391 
392  if (src_end - src < zsize + (sub_type != 2))
393  return AVERROR_INVALIDDATA;
394 
395  ret = uncompress(c->kempf_buf, &dlen, src, zsize);
396  if (ret)
397  return AVERROR_INVALIDDATA;
398  src += zsize;
399 
400  if (sub_type == 2) {
401  kempf_restore_buf(c->kempf_buf, dlen, dst, c->framebuf_stride,
402  NULL, 0, width, height, pal, npal, tidx);
403  return 0;
404  }
405 
406  nblocks = *src++ + 1;
407  cblocks = 0;
408  bstride = FFALIGN(width, 16) >> 4;
409  // blocks are coded LSB and we need normal bitreader for JPEG data
410  bits = 0;
411  for (i = 0; i < (FFALIGN(height, 16) >> 4); i++) {
412  for (j = 0; j < (FFALIGN(width, 16) >> 4); j++) {
413  if (!bits) {
414  if (src >= src_end)
415  return AVERROR_INVALIDDATA;
416  bitbuf = *src++;
417  bits = 8;
418  }
419  coded = bitbuf & 1;
420  bits--;
421  bitbuf >>= 1;
422  cblocks += coded;
423  if (cblocks > nblocks)
424  return AVERROR_INVALIDDATA;
425  c->kempf_flags[j + i * bstride] = coded;
426  }
427  }
428 
429  memset(c->jpeg_tile, 0, c->tile_stride * height);
430  jpg_decode_data(&c->jc, width, height, src, src_end - src,
431  c->jpeg_tile, c->tile_stride,
432  c->kempf_flags, bstride, nblocks, 0);
433 
434  kempf_restore_buf(c->kempf_buf, dlen, dst, c->framebuf_stride,
435  c->jpeg_tile, c->tile_stride,
436  width, height, pal, npal, tidx);
437 
438  return 0;
439 }
440 
442 {
443  int aligned_height;
444 
445  if (!c->framebuf || c->old_width < c->width || c->old_height < c->height) {
446  c->framebuf_stride = FFALIGN(c->width + 15, 16) * 3;
447  aligned_height = c->height + 15;
448  av_free(c->framebuf);
449  c->framebuf = av_mallocz(c->framebuf_stride * aligned_height);
450  if (!c->framebuf)
451  return AVERROR(ENOMEM);
452  }
453  if (!c->synth_tile || !c->jpeg_tile ||
454  c->old_tile_w < c->tile_width ||
455  c->old_tile_h < c->tile_height) {
456  c->tile_stride = FFALIGN(c->tile_width, 16) * 3;
457  aligned_height = FFALIGN(c->tile_height, 16);
458  av_free(c->synth_tile);
459  av_free(c->jpeg_tile);
460  av_free(c->kempf_buf);
461  av_free(c->kempf_flags);
462  c->synth_tile = av_mallocz(c->tile_stride * aligned_height);
463  c->jpeg_tile = av_mallocz(c->tile_stride * aligned_height);
464  c->kempf_buf = av_mallocz((c->tile_width + 1) * aligned_height
466  c->kempf_flags = av_mallocz( c->tile_width * aligned_height);
467  if (!c->synth_tile || !c->jpeg_tile ||
468  !c->kempf_buf || !c->kempf_flags)
469  return AVERROR(ENOMEM);
470  }
471 
472  return 0;
473 }
474 
476  GetByteContext *gb)
477 {
478  int i, j, k;
479  uint8_t *dst;
480  uint32_t bits;
481  uint32_t cur_size, cursor_w, cursor_h, cursor_stride;
482  uint32_t cursor_hot_x, cursor_hot_y;
483  int cursor_fmt;
484  uint8_t *tmp;
485 
486  cur_size = bytestream2_get_be32(gb);
487  cursor_w = bytestream2_get_byte(gb);
488  cursor_h = bytestream2_get_byte(gb);
489  cursor_hot_x = bytestream2_get_byte(gb);
490  cursor_hot_y = bytestream2_get_byte(gb);
491  cursor_fmt = bytestream2_get_byte(gb);
492 
493  cursor_stride = FFALIGN(cursor_w, c->cursor_fmt==1 ? 32 : 1) * 4;
494 
495  if (cursor_w < 1 || cursor_w > 256 ||
496  cursor_h < 1 || cursor_h > 256) {
497  av_log(avctx, AV_LOG_ERROR, "Invalid cursor dimensions %dx%d\n",
498  cursor_w, cursor_h);
499  return AVERROR_INVALIDDATA;
500  }
501  if (cursor_hot_x > cursor_w || cursor_hot_y > cursor_h) {
502  av_log(avctx, AV_LOG_WARNING, "Invalid hotspot position %d,%d\n",
503  cursor_hot_x, cursor_hot_y);
504  cursor_hot_x = FFMIN(cursor_hot_x, cursor_w - 1);
505  cursor_hot_y = FFMIN(cursor_hot_y, cursor_h - 1);
506  }
507  if (cur_size - 9 > bytestream2_get_bytes_left(gb) ||
508  c->cursor_w * c->cursor_h / 4 > cur_size) {
509  av_log(avctx, AV_LOG_ERROR, "Invalid cursor data size %d/%d\n",
510  cur_size, bytestream2_get_bytes_left(gb));
511  return AVERROR_INVALIDDATA;
512  }
513  if (cursor_fmt != 1 && cursor_fmt != 32) {
514  avpriv_report_missing_feature(avctx, "Cursor format %d",
515  cursor_fmt);
516  return AVERROR_PATCHWELCOME;
517  }
518 
519  tmp = av_realloc(c->cursor, cursor_stride * cursor_h);
520  if (!tmp) {
521  av_log(avctx, AV_LOG_ERROR, "Cannot allocate cursor buffer\n");
522  return AVERROR(ENOMEM);
523  }
524 
525  c->cursor = tmp;
526  c->cursor_w = cursor_w;
527  c->cursor_h = cursor_h;
528  c->cursor_hot_x = cursor_hot_x;
529  c->cursor_hot_y = cursor_hot_y;
530  c->cursor_fmt = cursor_fmt;
531  c->cursor_stride = cursor_stride;
532 
533  dst = c->cursor;
534  switch (c->cursor_fmt) {
535  case 1: // old monochrome
536  for (j = 0; j < c->cursor_h; j++) {
537  for (i = 0; i < c->cursor_w; i += 32) {
538  bits = bytestream2_get_be32(gb);
539  for (k = 0; k < 32; k++) {
540  dst[0] = !!(bits & 0x80000000);
541  dst += 4;
542  bits <<= 1;
543  }
544  }
545  }
546 
547  dst = c->cursor;
548  for (j = 0; j < c->cursor_h; j++) {
549  for (i = 0; i < c->cursor_w; i += 32) {
550  bits = bytestream2_get_be32(gb);
551  for (k = 0; k < 32; k++) {
552  int mask_bit = !!(bits & 0x80000000);
553  switch (dst[0] * 2 + mask_bit) {
554  case 0:
555  dst[0] = 0xFF; dst[1] = 0x00;
556  dst[2] = 0x00; dst[3] = 0x00;
557  break;
558  case 1:
559  dst[0] = 0xFF; dst[1] = 0xFF;
560  dst[2] = 0xFF; dst[3] = 0xFF;
561  break;
562  default:
563  dst[0] = 0x00; dst[1] = 0x00;
564  dst[2] = 0x00; dst[3] = 0x00;
565  }
566  dst += 4;
567  bits <<= 1;
568  }
569  }
570  }
571  break;
572  case 32: // full colour
573  /* skip monochrome version of the cursor and decode RGBA instead */
574  bytestream2_skip(gb, c->cursor_h * (FFALIGN(c->cursor_w, 32) >> 3));
575  for (j = 0; j < c->cursor_h; j++) {
576  for (i = 0; i < c->cursor_w; i++) {
577  int val = bytestream2_get_be32(gb);
578  *dst++ = val >> 0;
579  *dst++ = val >> 8;
580  *dst++ = val >> 16;
581  *dst++ = val >> 24;
582  }
583  }
584  break;
585  default:
586  return AVERROR_PATCHWELCOME;
587  }
588  return 0;
589 }
590 
591 #define APPLY_ALPHA(src, new, alpha) \
592  src = (src * (256 - alpha) + new * alpha) >> 8
593 
594 static void g2m_paint_cursor(G2MContext *c, uint8_t *dst, int stride)
595 {
596  int i, j;
597  int x, y, w, h;
598  const uint8_t *cursor;
599 
600  if (!c->cursor)
601  return;
602 
603  x = c->cursor_x - c->cursor_hot_x;
604  y = c->cursor_y - c->cursor_hot_y;
605 
606  cursor = c->cursor;
607  w = c->cursor_w;
608  h = c->cursor_h;
609 
610  if (x + w > c->width)
611  w = c->width - x;
612  if (y + h > c->height)
613  h = c->height - y;
614  if (x < 0) {
615  w += x;
616  cursor += -x * 4;
617  } else {
618  dst += x * 3;
619  }
620  if (y < 0) {
621  h += y;
622  cursor += -y * c->cursor_stride;
623  } else {
624  dst += y * stride;
625  }
626  if (w < 0 || h < 0)
627  return;
628 
629  for (j = 0; j < h; j++) {
630  for (i = 0; i < w; i++) {
631  uint8_t alpha = cursor[i * 4];
632  APPLY_ALPHA(dst[i * 3 + 0], cursor[i * 4 + 1], alpha);
633  APPLY_ALPHA(dst[i * 3 + 1], cursor[i * 4 + 2], alpha);
634  APPLY_ALPHA(dst[i * 3 + 2], cursor[i * 4 + 3], alpha);
635  }
636  dst += stride;
637  cursor += c->cursor_stride;
638  }
639 }
640 
641 static int g2m_decode_frame(AVCodecContext *avctx, void *data,
642  int *got_picture_ptr, AVPacket *avpkt)
643 {
644  const uint8_t *buf = avpkt->data;
645  int buf_size = avpkt->size;
646  G2MContext *c = avctx->priv_data;
647  AVFrame *pic = data;
648  GetByteContext bc, tbc;
649  int magic;
650  int got_header = 0;
651  uint32_t chunk_size;
652  int chunk_type;
653  int i;
654  int ret;
655 
656  if (buf_size < 12) {
657  av_log(avctx, AV_LOG_ERROR,
658  "Frame should have at least 12 bytes, got %d instead\n",
659  buf_size);
660  return AVERROR_INVALIDDATA;
661  }
662 
663  bytestream2_init(&bc, buf, buf_size);
664 
665  magic = bytestream2_get_be32(&bc);
666  if ((magic & ~0xF) != MKBETAG('G', '2', 'M', '0') ||
667  (magic & 0xF) < 2 || (magic & 0xF) > 4) {
668  av_log(avctx, AV_LOG_ERROR, "Wrong magic %08X\n", magic);
669  return AVERROR_INVALIDDATA;
670  }
671 
672  if ((magic & 0xF) != 4) {
673  av_log(avctx, AV_LOG_ERROR, "G2M2 and G2M3 are not yet supported\n");
674  return AVERROR(ENOSYS);
675  }
676 
677  while (bytestream2_get_bytes_left(&bc) > 5) {
678  chunk_size = bytestream2_get_le32(&bc) - 1;
679  chunk_type = bytestream2_get_byte(&bc);
680  if (chunk_size > bytestream2_get_bytes_left(&bc)) {
681  av_log(avctx, AV_LOG_ERROR, "Invalid chunk size %d type %02X\n",
682  chunk_size, chunk_type);
683  break;
684  }
685  switch (chunk_type) {
686  case FRAME_INFO:
687  c->got_header = 0;
688  if (chunk_size < 21) {
689  av_log(avctx, AV_LOG_ERROR, "Invalid frame info size %d\n",
690  chunk_size);
691  break;
692  }
693  c->width = bytestream2_get_be32(&bc);
694  c->height = bytestream2_get_be32(&bc);
695  if (c->width < 16 || c->width > avctx->width ||
696  c->height < 16 || c->height > avctx->height) {
697  av_log(avctx, AV_LOG_ERROR,
698  "Invalid frame dimensions %dx%d\n",
699  c->width, c->height);
700  ret = AVERROR_INVALIDDATA;
701  goto header_fail;
702  }
703  if (c->width != avctx->width || c->height != avctx->height)
704  avcodec_set_dimensions(avctx, c->width, c->height);
705  c->compression = bytestream2_get_be32(&bc);
706  if (c->compression != 2 && c->compression != 3) {
707  av_log(avctx, AV_LOG_ERROR,
708  "Unknown compression method %d\n",
709  c->compression);
710  return AVERROR_PATCHWELCOME;
711  }
712  c->tile_width = bytestream2_get_be32(&bc);
713  c->tile_height = bytestream2_get_be32(&bc);
714  if (!c->tile_width || !c->tile_height) {
715  av_log(avctx, AV_LOG_ERROR,
716  "Invalid tile dimensions %dx%d\n",
717  c->tile_width, c->tile_height);
718  ret = AVERROR_INVALIDDATA;
719  goto header_fail;
720  }
721  c->tiles_x = (c->width + c->tile_width - 1) / c->tile_width;
722  c->tiles_y = (c->height + c->tile_height - 1) / c->tile_height;
723  c->bpp = bytestream2_get_byte(&bc);
724  chunk_size -= 21;
725  bytestream2_skip(&bc, chunk_size);
726  if (g2m_init_buffers(c)) {
727  ret = AVERROR(ENOMEM);
728  goto header_fail;
729  }
730  got_header = 1;
731  break;
732  case TILE_DATA:
733  if (!c->tiles_x || !c->tiles_y) {
734  av_log(avctx, AV_LOG_WARNING,
735  "No frame header - skipping tile\n");
737  break;
738  }
739  if (chunk_size < 2) {
740  av_log(avctx, AV_LOG_ERROR, "Invalid tile data size %d\n",
741  chunk_size);
742  break;
743  }
744  c->tile_x = bytestream2_get_byte(&bc);
745  c->tile_y = bytestream2_get_byte(&bc);
746  if (c->tile_x >= c->tiles_x || c->tile_y >= c->tiles_y) {
747  av_log(avctx, AV_LOG_ERROR,
748  "Invalid tile pos %d,%d (in %dx%d grid)\n",
749  c->tile_x, c->tile_y, c->tiles_x, c->tiles_y);
750  break;
751  }
752  chunk_size -= 2;
753  ret = 0;
754  switch (c->compression) {
755  case COMPR_EPIC_J_B:
756  av_log(avctx, AV_LOG_ERROR,
757  "ePIC j-b compression is not implemented yet\n");
758  return AVERROR(ENOSYS);
759  case COMPR_KEMPF_J_B:
760  ret = kempf_decode_tile(c, c->tile_x, c->tile_y,
761  buf + bytestream2_tell(&bc),
762  chunk_size);
763  break;
764  }
765  if (ret && c->framebuf)
766  av_log(avctx, AV_LOG_ERROR, "Error decoding tile %d,%d\n",
767  c->tile_x, c->tile_y);
768  bytestream2_skip(&bc, chunk_size);
769  break;
770  case CURSOR_POS:
771  if (chunk_size < 5) {
772  av_log(avctx, AV_LOG_ERROR, "Invalid cursor pos size %d\n",
773  chunk_size);
774  break;
775  }
776  c->cursor_x = bytestream2_get_be16(&bc);
777  c->cursor_y = bytestream2_get_be16(&bc);
778  bytestream2_skip(&bc, chunk_size - 4);
779  break;
780  case CURSOR_SHAPE:
781  if (chunk_size < 8) {
782  av_log(avctx, AV_LOG_ERROR, "Invalid cursor data size %d\n",
783  chunk_size);
784  break;
785  }
786  bytestream2_init(&tbc, buf + bytestream2_tell(&bc),
787  chunk_size - 4);
788  g2m_load_cursor(avctx, c, &tbc);
789  bytestream2_skip(&bc, chunk_size);
790  break;
791  case CHUNK_CC:
792  case CHUNK_CD:
793  bytestream2_skip(&bc, chunk_size);
794  break;
795  default:
796  av_log(avctx, AV_LOG_WARNING, "Skipping chunk type %02X\n",
797  chunk_type);
798  bytestream2_skip(&bc, chunk_size);
799  }
800  }
801  if (got_header)
802  c->got_header = 1;
803 
804  if (c->width && c->height && c->framebuf) {
805  if ((ret = ff_get_buffer(avctx, pic, 0)) < 0)
806  return ret;
807 
808  pic->key_frame = got_header;
809  pic->pict_type = got_header ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
810 
811  for (i = 0; i < avctx->height; i++)
812  memcpy(pic->data[0] + i * pic->linesize[0],
813  c->framebuf + i * c->framebuf_stride,
814  c->width * 3);
815  g2m_paint_cursor(c, pic->data[0], pic->linesize[0]);
816 
817  *got_picture_ptr = 1;
818  }
819 
820  return buf_size;
821 header_fail:
822  c->width = c->height = 0;
823  c->tiles_x = c->tiles_y = 0;
824  return ret;
825 }
826 
828 {
829  G2MContext * const c = avctx->priv_data;
830  int ret;
831 
832  if ((ret = jpg_init(avctx, &c->jc)) != 0) {
833  av_log(avctx, AV_LOG_ERROR, "Cannot initialise VLCs\n");
834  jpg_free_context(&c->jc);
835  return AVERROR(ENOMEM);
836  }
837 
838  avctx->pix_fmt = AV_PIX_FMT_RGB24;
839 
840  return 0;
841 }
842 
844 {
845  G2MContext * const c = avctx->priv_data;
846 
847  jpg_free_context(&c->jc);
848 
849  av_freep(&c->kempf_buf);
850  av_freep(&c->kempf_flags);
851  av_freep(&c->synth_tile);
852  av_freep(&c->jpeg_tile);
853  av_freep(&c->cursor);
854  av_freep(&c->framebuf);
855 
856  return 0;
857 }
858 
860  .name = "g2m",
861  .long_name = NULL_IF_CONFIG_SMALL("Go2Meeting"),
862  .type = AVMEDIA_TYPE_VIDEO,
863  .id = AV_CODEC_ID_G2M,
864  .priv_data_size = sizeof(G2MContext),
868  .capabilities = CODEC_CAP_DR1,
869 };
int tiles_y
Definition: g2meet.c:91
int cursor_hot_y
Definition: g2meet.c:107
const char const char void * val
Definition: avisynth_c.h:671
av_cold void ff_dsputil_init(DSPContext *c, AVCodecContext *avctx)
Definition: dsputil.c:2678
static int kempf_decode_tile(G2MContext *c, int tile_x, int tile_y, const uint8_t *src, int src_size)
Definition: g2meet.c:337
#define AVERROR_PATCHWELCOME
This structure describes decoded (raw) audio or video data.
Definition: frame.h:96
uint8_t * kempf_flags
Definition: g2meet.c:101
int height
Definition: g2meet.c:89
ChunkType
Definition: g2meet.c:37
static av_cold void jpg_free_context(JPGContext *ctx)
Definition: g2meet.c:159
uint8_t * kempf_buf
Definition: g2meet.c:101
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:255
int width
Definition: g2meet.c:89
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: avcodec.h:4153
int got_header
Definition: g2meet.c:93
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
int cursor_fmt
Definition: g2meet.c:105
const uint8_t avpriv_mjpeg_bits_ac_luminance[17]
Definition: mjpeg.c:73
packed RGB 8:8:8, 24bpp, RGBRGB...
Definition: avcodec.h:4536
Scantable.
Definition: dsputil.h:111
static void kempf_restore_buf(const uint8_t *src, int len, uint8_t *dst, int stride, const uint8_t *jpeg_tile, int tile_stride, int width, int height, const uint8_t *pal, int npal, int tidx)
Definition: g2meet.c:308
void avcodec_set_dimensions(AVCodecContext *s, int width, int height)
Definition: utils.c:233
int size
Definition: avcodec.h:1064
#define DECLARE_ALIGNED(n, t, v)
Definition: avcodec.h:5102
void av_log(void *avcl, int level, const char *fmt,...) av_printf_format(3
Send the specified message to the log if the level is less than or equal to the current av_log_level...
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1342
static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)
Definition: bytestream.h:131
const uint8_t avpriv_mjpeg_bits_dc_chrominance[17]
Definition: mjpeg.c:70
const uint8_t avpriv_mjpeg_bits_ac_chrominance[17]
Definition: mjpeg.c:99
VLC dc_vlc[2]
Definition: g2meet.c:77
uint8_t permutated[64]
Definition: dsputil.h:113
static int g2m_init_buffers(G2MContext *c)
Definition: g2meet.c:441
int stride
Definition: mace.c:144
AVCodec.
Definition: avcodec.h:2922
#define av_cold
Definition: avcodec.h:653
int16_t block[6][64]
Definition: g2meet.c:79
MJPEG encoder and decoder.
static void jpg_unescape(const uint8_t *src, int src_size, uint8_t *dst, int *dst_size)
Definition: g2meet.c:171
int tile_width
Definition: g2meet.c:90
Predicted.
Definition: avcodec.h:2305
void av_freep(void *ptr)
Free a memory block which has been allocated with av_malloc(z)() or av_realloc() and set the pointer ...
Definition: mem.c:234
if((e=av_dict_get(options,"", NULL, AV_DICT_IGNORE_SUFFIX)))
Definition: avfilter.c:965
int bpp
Definition: g2meet.c:89
int ff_init_vlc_sparse(VLC *vlc, int nb_bits, int nb_codes, const void *bits, int bits_wrap, int bits_size, const void *codes, int codes_wrap, int codes_size, const void *symbols, int symbols_wrap, int symbols_size, int flags)
Definition: bitstream.c:265
uint8_t bits
Definition: crc.c:260
uint8_t
int tile_x
Definition: g2meet.c:91
#define Y
Definition: vf_boxblur.c:76
int cursor_h
Definition: g2meet.c:106
const char * name
Name of the codec implementation.
Definition: avcodec.h:2929
int framebuf_stride
Definition: g2meet.c:96
#define CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:742
const char data[16]
Definition: mxf.c:68
void ff_mjpeg_build_huffman_codes(uint8_t *huff_size, uint16_t *huff_code, const uint8_t *bits_table, const uint8_t *val_table)
Definition: mjpeg.c:127
bitstream reader API header.
uint8_t idct_permutation[64]
idct input permutation.
Definition: dsputil.h:246
uint8_t * framebuf
Definition: g2meet.c:95
int version
Definition: g2meet.c:86
ScanTable scantable
Definition: g2meet.c:75
static av_cold int g2m_decode_init(AVCodecContext *avctx)
Definition: g2meet.c:827
VLC ac_vlc[2]
Definition: g2meet.c:77
static av_cold int jpg_init(AVCodecContext *avctx, JPGContext *c)
Definition: g2meet.c:131
#define U(x)
Definition: vp56_arith.h:37
uint8_t * buf
Definition: g2meet.c:81
static double alpha(void *priv, double x, double y)
Definition: vf_geq.c:98
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: avcodec.h:4147
void av_free(void *ptr)
Free a memory block which has been allocated with av_malloc(z)() or av_realloc(). ...
Definition: mem.c:219
uint8_t pi<< 24) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_U8, uint8_t,(*(constuint8_t *) pi-0x80)*(1.0f/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_U8, uint8_t,(*(constuint8_t *) pi-0x80)*(1.0/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S16, int16_t,(*(constint16_t *) pi >>8)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S16, int16_t,*(constint16_t *) pi *(1.0f/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S16, int16_t,*(constint16_t *) pi *(1.0/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S32, int32_t,(*(constint32_t *) pi >>24)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S32, int32_t,*(constint32_t *) pi *(1.0f/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S32, int32_t,*(constint32_t *) pi *(1.0/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_FLT, float, av_clip_uint8(lrintf(*(constfloat *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_FLT, float, av_clip_int16(lrintf(*(constfloat *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_FLT, float, av_clipl_int32(llrintf(*(constfloat *) pi *(1U<< 31)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_DBL, double, av_clip_uint8(lrint(*(constdouble *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_DBL, double, av_clip_int16(lrint(*(constdouble *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_DBL, double, av_clipl_int32(llrint(*(constdouble *) pi *(1U<< 31))))#defineSET_CONV_FUNC_GROUP(ofmt, ifmt) staticvoidset_generic_function(AudioConvert *ac){}voidff_audio_convert_free(AudioConvert **ac){return;ff_dither_free(&(*ac) ->dc);av_freep(ac);}AudioConvert *ff_audio_convert_alloc(AVAudioResampleContext *avr, enumAVSampleFormatout_fmt, enumAVSampleFormatin_fmt, intchannels, intsample_rate, intapply_map){AudioConvert *ac;intin_planar, out_planar;ac=av_mallocz(sizeof(*ac));returnNULL;ac->avr=avr;ac->out_fmt=out_fmt;ac->in_fmt=in_fmt;ac->channels=channels;ac->apply_map=apply_map;if(avr->dither_method!=AV_RESAMPLE_DITHER_NONE &&av_get_packed_sample_fmt(out_fmt)==AV_SAMPLE_FMT_S16 &&av_get_bytes_per_sample(in_fmt)>2){ac->dc=ff_dither_alloc(avr, out_fmt, in_fmt, channels, sample_rate, apply_map);if(!ac->dc){av_free(ac);returnNULL;}returnac;}in_planar=av_sample_fmt_is_planar(in_fmt);out_planar=av_sample_fmt_is_planar(out_fmt);if(in_planar==out_planar){ac->func_type=CONV_FUNC_TYPE_FLAT;ac->planes=in_planar?ac->channels:1;}elseif(in_planar) ac->func_type=CONV_FUNC_TYPE_INTERLEAVE;elseac->func_type=CONV_FUNC_TYPE_DEINTERLEAVE;set_generic_function(ac);ff_audio_convert_init_arm(ac);ff_audio_convert_init_x86(ac);returnac;}intff_audio_convert(AudioConvert *ac, AudioData *out, AudioData *in){intuse_generic=1;intlen=in->nb_samples;intp;if(ac->dc){av_dlog(ac->avr,"%dsamples-audio_convert:%sto%s(dithered)\n", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt));returnff_convert_dither(ac-> dc
static const uint16_t mask[17]
Definition: lzw.c:37
static int g2m_load_cursor(AVCodecContext *avctx, G2MContext *c, GetByteContext *gb)
Definition: g2meet.c:475
static av_cold int g2m_decode_end(AVCodecContext *avctx)
Definition: g2meet.c:843
static av_always_inline void bytestream2_skip(GetByteContext *g, unsigned int size)
Definition: bytestream.h:162
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:151
int old_tile_h
Definition: g2meet.c:99
int cursor_stride
Definition: g2meet.c:104
static av_always_inline unsigned int bytestream2_get_bytes_left(GetByteContext *g)
Definition: bytestream.h:152
Libavcodec external API header.
void(* idct)(int16_t *block)
Definition: dsputil.h:219
Definition: get_bits.h:63
static int jpg_decode_block(JPGContext *c, GetBitContext *gb, int plane, int16_t *block)
Definition: g2meet.c:188
uint8_t * cursor
Definition: g2meet.c:103
#define FF_INPUT_BUFFER_PADDING_SIZE
Required number of additionally allocated bytes at the end of the input bitstream for decoding...
Definition: avcodec.h:580
int prev_dc[3]
Definition: g2meet.c:78
#define V
Definition: options_table.h:35
Compression
Definition: g2meet.c:46
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:167
static int jpg_decode_data(JPGContext *c, int width, int height, const uint8_t *src, int src_size, uint8_t *dst, int dst_stride, const uint8_t *mask, int mask_stride, int num_mbs, int swapuv)
Definition: g2meet.c:232
static int g2m_decode_frame(AVCodecContext *avctx, void *data, int *got_picture_ptr, AVPacket *avpkt)
Definition: g2meet.c:641
void * av_realloc(void *ptr, size_t size) 1(2)
Allocate or reallocate a block of memory.
Definition: mem.c:141
float y
uint8_t * synth_tile
Definition: g2meet.c:98
ret
Definition: avfilter.c:961
int width
picture width / height.
Definition: avcodec.h:1314
const uint8_t avpriv_mjpeg_bits_dc_luminance[17]
Definition: mjpeg.c:65
const uint8_t avpriv_mjpeg_val_dc[12]
Definition: mjpeg.c:67
int cursor_y
Definition: g2meet.c:106
#define FFMIN(a, b)
Definition: avcodec.h:925
static void g2m_paint_cursor(G2MContext *c, uint8_t *dst, int stride)
Definition: g2meet.c:594
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:550
int tile_y
Definition: g2meet.c:91
DSPContext dsp
Definition: g2meet.c:74
int old_tile_w
Definition: g2meet.c:99
static av_always_inline int bytestream2_tell(GetByteContext *g)
Definition: bytestream.h:186
static int width
Definition: utils.c:158
AVCodec ff_g2m_decoder
Definition: g2meet.c:859
AVS_Value src
Definition: avisynth_c.h:523
static void yuv2rgb(uint8_t *out, int Y, int U, int V)
Definition: g2meet.c:225
#define APPLY_ALPHA(src, new, alpha)
Definition: g2meet.c:591
int tile_stride
Definition: g2meet.c:99
main external API structure.
Definition: avcodec.h:1146
static av_cold int build_vlc(VLC *vlc, const uint8_t *bits_table, const uint8_t *val_table, int nb_codes, int is_ac)
Definition: g2meet.c:110
static void close(AVCodecParserContext *s)
Definition: h264_parser.c:538
static int get_xbits(GetBitContext *s, int n)
read mpeg1 dc style vlc (sign bit + mantisse with no MSB).
Definition: get_bits.h:226
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: utils.c:941
JPGContext jc
Definition: g2meet.c:85
av_cold void ff_init_scantable(uint8_t *permutation, ScanTable *st, const uint8_t *src_scantable)
Definition: dsputil.c:111
void * buf
Definition: avisynth_c.h:594
BYTE int const BYTE int int int height
Definition: avisynth_c.h:713
int compression
Definition: g2meet.c:88
uint8_t * data
Definition: avcodec.h:1063
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
Definition: get_bits.h:405
int cursor_w
Definition: g2meet.c:106
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:124
int cursor_hot_x
Definition: g2meet.c:107
#define MKBETAG(a, b, c, d)
static const uint8_t chroma_quant[64]
Definition: g2meet.c:62
void * priv_data
Definition: avcodec.h:1182
void avpriv_report_missing_feature(void *avc, const char *msg,...) av_printf_format(2
Log a generic warning message about a missing feature.
int tiles_x
Definition: g2meet.c:91
const uint8_t avpriv_mjpeg_val_ac_luminance[]
Definition: mjpeg.c:75
common internal api header.
const uint8_t ff_zigzag_direct[64]
Definition: mathtables.c:115
static double c[64]
void(* clear_block)(int16_t *block)
Definition: dsputil.h:142
#define FFALIGN(x, a)
Definition: avcodec.h:930
int cursor_x
Definition: g2meet.c:106
static const uint8_t luma_quant[64]
Definition: g2meet.c:51
DSP utils.
int tile_height
Definition: g2meet.c:90
const uint8_t avpriv_mjpeg_val_ac_chrominance[]
Definition: mjpeg.c:102
#define AVERROR_INVALIDDATA
int len
uint8_t pi<< 24) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_U8, uint8_t,(*(constuint8_t *) pi-0x80)*(1.0f/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_U8, uint8_t,(*(constuint8_t *) pi-0x80)*(1.0/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S16, int16_t,(*(constint16_t *) pi >>8)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S16, int16_t,*(constint16_t *) pi *(1.0f/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S16, int16_t,*(constint16_t *) pi *(1.0/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S32, int32_t,(*(constint32_t *) pi >>24)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S32, int32_t,*(constint32_t *) pi *(1.0f/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S32, int32_t,*(constint32_t *) pi *(1.0/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_FLT, float, av_clip_uint8(lrintf(*(constfloat *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_FLT, float, av_clip_int16(lrintf(*(constfloat *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_FLT, float, av_clipl_int32(llrintf(*(constfloat *) pi *(1U<< 31)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_DBL, double, av_clip_uint8(lrint(*(constdouble *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_DBL, double, av_clip_int16(lrint(*(constdouble *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_DBL, double, av_clipl_int32(llrint(*(constdouble *) pi *(1U<< 31))))#defineSET_CONV_FUNC_GROUP(ofmt, ifmt) staticvoidset_generic_function(AudioConvert *ac){}voidff_audio_convert_free(AudioConvert **ac){return;ff_dither_free(&(*ac) ->dc);av_freep(ac);}AudioConvert *ff_audio_convert_alloc(AVAudioResampleContext *avr, enumAVSampleFormatout_fmt, enumAVSampleFormatin_fmt, intchannels, intsample_rate, intapply_map){AudioConvert *ac;intin_planar, out_planar;ac=av_mallocz(sizeof(*ac));returnNULL;ac->avr=avr;ac->out_fmt=out_fmt;ac->in_fmt=in_fmt;ac->channels=channels;ac->apply_map=apply_map;if(avr->dither_method!=AV_RESAMPLE_DITHER_NONE &&av_get_packed_sample_fmt(out_fmt)==AV_SAMPLE_FMT_S16 &&av_get_bytes_per_sample(in_fmt)>2){ac->dc=ff_dither_alloc(avr, out_fmt, in_fmt, channels, sample_rate, apply_map);if(!ac->dc){av_free(ac);returnNULL;}returnac;}in_planar=av_sample_fmt_is_planar(in_fmt);out_planar=av_sample_fmt_is_planar(out_fmt);if(in_planar==out_planar){ac->func_type=CONV_FUNC_TYPE_FLAT;ac->planes=in_planar?ac->channels:1;}elseif(in_planar) ac->func_type=CONV_FUNC_TYPE_INTERLEAVE;elseac->func_type=CONV_FUNC_TYPE_DEINTERLEAVE;set_generic_function(ac);ff_audio_convert_init_arm(ac);ff_audio_convert_init_x86(ac);returnac;}intff_audio_convert(AudioConvert *ac, AudioData *out, AudioData *in){intuse_generic=1;intlen=in->nb_samples;intp;if(ac->dc){av_dlog(ac->avr,"%dsamples-audio_convert:%sto%s(dithered)\n", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt));returnff_convert_dither(ac-> out
VLC_TYPE(* table)[2]
code, bits
Definition: get_bits.h:65
int key_frame
1 -&gt; keyframe, 0-&gt; not
Definition: frame.h:162
#define AVERROR(e)
int old_width
Definition: g2meet.c:96
static int decode(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: crystalhd.c:868
uint8_t * jpeg_tile
Definition: g2meet.c:98
int old_height
Definition: g2meet.c:96
This structure stores compressed data.
Definition: avcodec.h:1040
void ff_free_vlc(VLC *vlc)
Definition: bitstream.c:353
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:107
for(j=16;j >0;--j)
void * av_mallocz(size_t size) av_malloc_attrib 1(1)
Allocate a block of size bytes with alignment suitable for all memory accesses (including vectors if ...
Definition: mem.c:241
DSPContext.
Definition: dsputil.h:124
static int16_t block[64]
Definition: dct-test.c:198