FFmpeg
prosumer.c
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1 /*
2  * Brooktree ProSumer Video decoder
3  * Copyright (c) 2018 Paul B Mahol
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 <stdio.h>
23 #include <stdlib.h>
24 #include <string.h>
25 
26 #include "libavutil/internal.h"
27 #include "libavutil/intreadwrite.h"
28 #include "libavutil/mem.h"
29 
30 #include "avcodec.h"
31 #include "bytestream.h"
32 #include "codec_internal.h"
33 #include "decode.h"
34 
35 typedef struct ProSumerContext {
38 
39  unsigned stride;
40  unsigned size;
41  uint32_t lut[0x2000];
42  uint8_t *initial_line;
43  uint8_t *decbuffer;
45 
46 #define PAIR(high, low) (((uint64_t)(high) << 32) | low)
47 
48 static int decompress(GetByteContext *gb, int size, PutByteContext *pb, const uint32_t *lut)
49 {
50  int pos, idx, cnt, fill;
51  uint32_t a, b, c;
52 
53  bytestream2_skip(gb, 32);
54  cnt = 4;
55  a = bytestream2_get_le32(gb);
56  idx = a >> 20;
57  b = lut[2 * idx];
58 
59  while (1) {
61  return 0;
62  if ((b & 0xFF00u) != 0x8000u || (b & 0xFFu)) {
63  if ((b & 0xFF00u) != 0x8000u) {
64  bytestream2_put_le16(pb, b);
65  } else {
66  idx = 0;
67  for (int i = 0; i < (b & 0xFFu); i++)
68  bytestream2_put_le32(pb, 0);
69  }
70  c = b >> 16;
71  if (c & 0xFF00u) {
72  fill = lut[2 * idx + 1];
73  if ((c & 0xF000u) == 0x1000) {
74  bytestream2_put_le16(pb, fill);
75  } else {
76  bytestream2_put_le32(pb, fill);
77  }
78  c = (c >> 8) & 0x0Fu;
79  }
80  while (c) {
81  a <<= 4;
82  cnt--;
83  if (!cnt) {
84  if (bytestream2_get_bytes_left(gb) <= 0) {
85  if (!a)
86  return 0;
87  } else {
88  pos = bytestream2_tell(gb);
89  bytestream2_seek(gb, pos ^ 2, SEEK_SET);
90  AV_WN16(&a, bytestream2_peek_le16(gb));
91  bytestream2_seek(gb, pos + 2, SEEK_SET);
92  }
93  cnt = 4;
94  }
95  c--;
96  }
97  idx = a >> 20;
98  b = lut[2 * idx];
99  if (!b)
100  return AVERROR_INVALIDDATA;
101  continue;
102  }
103  idx = 2;
104  while (idx) {
105  a <<= 4;
106  cnt--;
107  if (cnt) {
108  idx--;
109  continue;
110  }
111  if (bytestream2_get_bytes_left(gb) <= 0) {
112  if (a) {
113  cnt = 4;
114  idx--;
115  continue;
116  }
117  return 0;
118  }
119  pos = bytestream2_tell(gb);
120  bytestream2_seek(gb, pos ^ 2, SEEK_SET);
121  AV_WN16(&a, bytestream2_peek_le16(gb));
122  bytestream2_seek(gb, pos + 2, SEEK_SET);
123  cnt = 4;
124  idx--;
125  }
126  b = PAIR(4, a) >> 16;
127  }
128 
129  return 0;
130 }
131 
132 static void vertical_predict(uint32_t *dst, int offset, const uint32_t *src, int stride, int height)
133 {
134  dst += offset >> 2;
135 
136  for (int i = 0; i < height; i++) {
137  for (int j = 0; j < stride >> 2; j++) {
138  dst[j] = (((src[j] >> 3) + (0x3F3F3F3F & dst[j])) << 3) & 0xFCFCFCFC;
139  }
140 
141  dst += stride >> 2;
142  src += stride >> 2;
143  }
144 }
145 
147  int *got_frame, AVPacket *avpkt)
148 {
149  ProSumerContext *s = avctx->priv_data;
150  int ret;
151 
152  if (avpkt->size <= 32)
153  return AVERROR_INVALIDDATA;
154 
155  bytestream2_init(&s->gb, avpkt->data, avpkt->size);
156  bytestream2_init_writer(&s->pb, s->decbuffer, s->size);
157  ret = decompress(&s->gb, AV_RL32(avpkt->data + 28) >> 1, &s->pb, s->lut);
158  if (ret < 0)
159  return ret;
160  if (bytestream2_get_bytes_left_p(&s->pb) > s->size * (int64_t)avctx->discard_damaged_percentage / 100)
161  return AVERROR_INVALIDDATA;
162 
163  av_assert0(s->size >= bytestream2_get_bytes_left_p(&s->pb));
164  memset(s->decbuffer + bytestream2_tell_p(&s->pb), 0, bytestream2_get_bytes_left_p(&s->pb));
165 
166  vertical_predict((uint32_t *)s->decbuffer, 0, (uint32_t *)s->initial_line, s->stride, 1);
167  vertical_predict((uint32_t *)s->decbuffer, s->stride, (uint32_t *)s->decbuffer, s->stride, avctx->height - 1);
168 
169  ret = ff_get_buffer(avctx, frame, 0);
170  if (ret < 0)
171  return ret;
172 
173  for (int i = avctx->height - 1; i >= 0 ; i--) {
174  uint8_t *y = &frame->data[0][i * frame->linesize[0]];
175  uint8_t *u = &frame->data[1][i * frame->linesize[1]];
176  uint8_t *v = &frame->data[2][i * frame->linesize[2]];
177  const uint8_t *src = s->decbuffer + (avctx->height - 1 - i) * s->stride;
178 
179  for (int j = 0; j < avctx->width; j += 8) {
180  *(u++) = *src++;
181  *(y++) = *src++;
182  *(v++) = *src++;
183  *(y++) = *src++;
184 
185  *(u++) = *src++;
186  *(y++) = *src++;
187  *(v++) = *src++;
188  *(y++) = *src++;
189 
190  *(y++) = *src++;
191  *(y++) = *src++;
192  *(y++) = *src++;
193  *(y++) = *src++;
194  }
195  }
196 
197  *got_frame = 1;
198 
199  return avpkt->size;
200 }
201 
202 #define TB(i) (1 + ((i) > 10) + ((i) > 49))
203 static const uint16_t table[] = {
204  0x0000, 0x100, 0x0101, 0x200, 0x0202, 0x300, 0xFFFF, 0x400, 0xFEFE, 0x500,
205  0x0001, 0x700, 0x0100, 0x800, 0x00FF, 0x900, 0xFF00, 0xA00, 0x8001, 0x600,
206  0x8002, 0xB00, 0xFCFC, 0x010, 0x0404, 0x030, 0x0002, 0xD30, 0xFEFC, 0x020,
207  0xFCFE, 0x040, 0xFEFF, 0xD20, 0x0808, 0x060, 0xFFFE, 0x050, 0x0402, 0xC00,
208  0x0204, 0xC10, 0xF8F8, 0xC30, 0x0201, 0xC40, 0x0102, 0xC60, 0x0804, 0xF30,
209  0x0408, 0xE00, 0xF8FC, 0xE10, 0xFCF8, 0xC70, 0x00FE, 0xD00, 0xFE00, 0xD40,
210  0xFF01, 0xD50, 0x01FF, 0xD60, 0x0200, 0xD70, 0xFCFF, 0xE20, 0x0104, 0xE30,
211  0xF0F0, 0xE50, 0x0401, 0xE70, 0x02FE, 0xF00, 0xFE02, 0xF10, 0xFE01, 0xF20,
212  0x01FE, 0xF40, 0xFF02, 0xF50, 0x02FF, 0xF60, 0x8003, 0xC20, 0x8004, 0x070,
213  0x8005, 0xD10, 0x8006, 0xC50, 0x8007, 0xE60, 0x8008, 0xE40, 0x8009, 0xF70,
214  0xFC02, 0x080, 0xFE04, 0x081, 0xFC00, 0x082, 0x02FC, 0x083, 0x1010, 0x084,
215  0x00FC, 0x085, 0x0004, 0x086, 0x0400, 0x087, 0xFFFC, 0x088, 0x1008, 0x089,
216  0x0810, 0x08A, 0x0802, 0x08B, 0x0208, 0x08C, 0xFEF8, 0x08D, 0xFC01, 0x08E,
217  0x04FF, 0x08F, 0xF8FE, 0x090, 0xFC04, 0x091, 0x04FC, 0x092, 0xFF04, 0x093,
218  0x01FC, 0x094, 0xF0F8, 0x095, 0xF8F0, 0x096, 0x04FE, 0x097, 0xF0FC, 0x098,
219  0x0008, 0x099, 0x08FE, 0x09A, 0x01F8, 0x09B, 0x0800, 0x09C, 0x08FC, 0x09D,
220  0xFE08, 0x09E, 0xFC08, 0x09F, 0xF800, 0x0A0, 0x0108, 0x0A1, 0xF802, 0x0A2,
221  0x0801, 0x0A3, 0x00F8, 0x0A4, 0xF804, 0x0A5, 0xF8FF, 0x0A6, 0xFFF8, 0x0A7,
222  0x04F8, 0x0A8, 0x02F8, 0x0A9, 0x1004, 0x0AA, 0x08F8, 0x0AB, 0xF808, 0x0AC,
223  0x0410, 0x0AD, 0xFF08, 0x0AE, 0x08FF, 0x0AF, 0xFCF0, 0x0B0, 0xF801, 0x0B1,
224  0xE0F0, 0x0B2, 0xF3F3, 0x0B3, 0xF0E0, 0x0B4, 0xFAFA, 0x0B5, 0xF7F7, 0x0B6,
225  0xFEF0, 0x0B7, 0xF0FE, 0x0B8, 0xE9E9, 0x0B9, 0xF9F9, 0x0BA, 0x2020, 0x0BB,
226  0xE0E0, 0x0BC, 0x02F0, 0x0BD, 0x04F0, 0x0BE, 0x2010, 0x0BF, 0xECEC, 0x0C0,
227  0xEFEF, 0x0C1, 0x1020, 0x0C2, 0xF5F5, 0x0C3, 0xF4F4, 0x0C4, 0xEDED, 0x0C5,
228  0xEAEA, 0x0C6, 0xFBFB, 0x0C7, 0x1002, 0x0C8, 0xF2F2, 0x0C9, 0xF6F6, 0x0CA,
229  0xF1F1, 0x0CB, 0xFDFD, 0x0CC, 0x0210, 0x0CD, 0x10FF, 0x0CE, 0xFDFE, 0x0CF,
230  0x10F8, 0x0D0, 0x1000, 0x0D1, 0xF001, 0x0D2, 0x1001, 0x0D3, 0x0010, 0x0D4,
231  0x10FE, 0x0D5, 0xEBEB, 0x0D6, 0xFE10, 0x0D7, 0x0110, 0x0D8, 0xF000, 0x0D9,
232  0x08F0, 0x0DA, 0x01F0, 0x0DB, 0x0303, 0x0DC, 0x00F0, 0x0DD, 0xF002, 0x0DE,
233  0x10FC, 0x0DF, 0xFC10, 0x0E0, 0xF0FF, 0x0E1, 0xEEEE, 0x0E2, 0xF004, 0x0E3,
234  0xFFF0, 0x0E4, 0xF7F8, 0x0E5, 0xF3F2, 0x0E6, 0xF9FA, 0x0E7, 0x0820, 0x0E8,
235  0x0302, 0x0E9, 0xE0F8, 0x0EA, 0x0505, 0x0EB, 0x2008, 0x0EC, 0xE8E8, 0x0ED,
236  0x0403, 0x0EE, 0xFBFC, 0x0EF, 0xFCFD, 0x0F0, 0xFBFA, 0x0F1, 0x0203, 0x0F2,
237  0xFCFB, 0x0F3, 0x0304, 0x0F4, 0xF810, 0x0F5, 0xFF10, 0x0F6, 0xF008, 0x0F7,
238  0xFEFD, 0x0F8, 0xF7F6, 0x0F9, 0xF2F1, 0x0FA, 0xF3F4, 0x0FB, 0xEDEC, 0x0FC,
239  0xF4F1, 0x0FD, 0xF5F6, 0x0FE, 0xF0F1, 0x0FF, 0xF9F8, 0xC80, 0x10F0, 0xC81,
240  0xF2F3, 0xC82, 0xF7F9, 0xC83, 0xF6F5, 0xC84, 0xF0EF, 0xC85, 0xF4F5, 0xC86,
241  0xF6F7, 0xC87, 0xFAF9, 0xC88, 0x0405, 0xC89, 0xF8F9, 0xC8A, 0xFAFB, 0xC8B,
242  0xF1F0, 0xC8C, 0xF4F3, 0xC8D, 0xF1F2, 0xC8E, 0xF8E0, 0xC8F, 0xF8F7, 0xC90,
243  0xFDFC, 0xC91, 0xF8FA, 0xC92, 0xFAF6, 0xC93, 0xEEEF, 0xC94, 0xF5F7, 0xC95,
244  0xFDFB, 0xC96, 0xF4F6, 0xC97, 0xFCFA, 0xC98, 0xECED, 0xC99, 0xF0F3, 0xC9A,
245  0xF3F1, 0xC9B, 0xECEB, 0xC9C, 0xEDEE, 0xC9D, 0xF9F7, 0xC9E, 0x0420, 0xC9F,
246  0xEBEA, 0xCA0, 0xF0F4, 0xCA1, 0xF3F5, 0xCA2, 0xFAF7, 0xCA3, 0x0301, 0xCA4,
247  0xF3F7, 0xCA5, 0xF7F3, 0xCA6, 0xEFF0, 0xCA7, 0xF9F6, 0xCA8, 0xEFEE, 0xCA9,
248  0xF4F7, 0xCAA, 0x0504, 0xCAB, 0xF5F4, 0xCAC, 0xF1F3, 0xCAD, 0xEBEE, 0xCAE,
249  0xF2F5, 0xCAF, 0xF3EF, 0xCB0, 0xF5F1, 0xCB1, 0xF9F3, 0xCB2, 0xEDF0, 0xCB3,
250  0xEEF1, 0xCB4, 0xF6F9, 0xCB5, 0xF8FB, 0xCB6, 0xF010, 0xCB7, 0xF2F6, 0xCB8,
251  0xF4ED, 0xCB9, 0xF7FB, 0xCBA, 0xF8F3, 0xCBB, 0xEDEB, 0xCBC, 0xF0F2, 0xCBD,
252  0xF2F9, 0xCBE, 0xF8F1, 0xCBF, 0xFAFC, 0xCC0, 0xFBF8, 0xCC1, 0xF6F0, 0xCC2,
253  0xFAF8, 0xCC3, 0x0103, 0xCC4, 0xF3F6, 0xCC5, 0xF4F9, 0xCC6, 0xF7F2, 0xCC7,
254  0x2004, 0xCC8, 0xF2F0, 0xCC9, 0xF4F2, 0xCCA, 0xEEED, 0xCCB, 0xFCE0, 0xCCC,
255  0xEAE9, 0xCCD, 0xEAEB, 0xCCE, 0xF6F4, 0xCCF, 0xFFFD, 0xCD0, 0xE9EA, 0xCD1,
256  0xF1F4, 0xCD2, 0xF6EF, 0xCD3, 0xF6F8, 0xCD4, 0xF8F6, 0xCD5, 0xEFF2, 0xCD6,
257  0xEFF1, 0xCD7, 0xF7F1, 0xCD8, 0xFBFD, 0xCD9, 0xFEF6, 0xCDA, 0xFFF7, 0xCDB,
258  0x0605, 0xCDC, 0xF0F5, 0xCDD, 0xF0FA, 0xCDE, 0xF1F9, 0xCDF, 0xF2FC, 0xCE0,
259  0xF7EE, 0xCE1, 0xF7F5, 0xCE2, 0xF9FC, 0xCE3, 0xFAF5, 0xCE4, 0xFBF1, 0xCE5,
260  0xF1EF, 0xCE6, 0xF1FA, 0xCE7, 0xF4F8, 0xCE8, 0xF7F0, 0xCE9, 0xF7F4, 0xCEA,
261  0xF7FC, 0xCEB, 0xF9FB, 0xCEC, 0xFAF1, 0xCED, 0xFBF9, 0xCEE, 0xFDFF, 0xCEF,
262  0xE0FC, 0xCF0, 0xEBEC, 0xCF1, 0xEDEF, 0xCF2, 0xEFED, 0xCF3, 0xF1F6, 0xCF4,
263  0xF2F7, 0xCF5, 0xF3EE, 0xCF6, 0xF3F8, 0xCF7, 0xF5F2, 0xCF8, 0xF8F2, 0xCF9,
264  0xF9F1, 0xCFA, 0xF9F2, 0xCFB, 0xFBEF, 0xCFC, 0x00FD, 0xCFD, 0xECEE, 0xCFE,
265  0xF2EF, 0xCFF, 0xF2F8, 0xD80, 0xF5F0, 0xD81, 0xF6F2, 0xD82, 0xFCF7, 0xD83,
266  0xFCF9, 0xD84, 0x0506, 0xD85, 0xEEEC, 0xD86, 0xF0F6, 0xD87, 0xF2F4, 0xD88,
267  0xF6F1, 0xD89, 0xF8F5, 0xD8A, 0xF9F4, 0xD8B, 0xFBF7, 0xD8C, 0x0503, 0xD8D,
268  0xEFEC, 0xD8E, 0xF3F0, 0xD8F, 0xF4F0, 0xD90, 0xF5F3, 0xD91, 0xF6F3, 0xD92,
269  0xF7FA, 0xD93, 0x800A, 0xD94, 0x800B, 0xD95, 0x800C, 0xD96, 0x800D, 0xD97,
270  0x800E, 0xD98, 0x800F, 0xD99, 0x8010, 0xD9A, 0x8011, 0xD9B, 0x8012, 0xD9C,
271  0x8013, 0xD9D, 0x8014, 0xD9E, 0x8015, 0xD9F, 0x8016, 0xDA0, 0x8017, 0xDA1,
272  0x8018, 0xDA2, 0x8019, 0xDA3, 0x801A, 0xDA4, 0x801B, 0xDA5, 0x801C, 0xDA6,
273  0x801D, 0xDA7, 0x801E, 0xDA8, 0x801F, 0xDA9, 0x8020, 0xDAA, 0x8021, 0xDAB,
274  0x8022, 0xDAC, 0x8023, 0xDAD, 0x8024, 0xDAE, 0x8025, 0xDAF, 0x8026, 0xDB0,
275  0x8027, 0xDB1, 0x8028, 0xDB2, 0x8029, 0xDB3, 0x802A, 0xDB4, 0x802B, 0xDB5,
276  0x802C, 0xDB6, 0x802D, 0xDB7, 0x802E, 0xDB8, 0x802F, 0xDB9, 0x80FF, 0xDBA,
277 };
278 
279 static void fill_elements(uint32_t idx, uint32_t shift, uint32_t *e0, uint32_t *e1)
280 {
281  uint32_t b, h = idx << (32 - shift);
282 
283  for (int j = 0; j < 2; j++) {
284  for (int i = 0; i < 43; i++) {
285  b = 4 * TB(i);
286  if (shift >= b && ((h & (0xFFF00000u << (12 - b))) >> 20) == table[2 * i + 1]) {
287  if (table[2 * i] >> 8 == 0x80u) {
288  return;
289  } else {
290  *e0 = (*e0 & 0xFFFFFFu) | (((12 + b - shift) | (0x40u<<j)) << 22);
291  if (j == 0) {
292  *e1 = table[2 * i];
293  shift -= b;
294  h <<= b;
295  } else {
296  *e1 |= (unsigned)table[2 * i] << 16;
297  }
298  break;
299  }
300  }
301  }
302  }
303 }
304 
305 static void fill_lut(uint32_t *lut)
306 {
307  for (int i = 1; i < FF_ARRAY_ELEMS(table); i += 2) {
308  uint32_t a = table[i];
309  uint32_t b = TB(i>>1);
310  uint32_t c, d;
311 
312  c = (b << 16) | table[i-1];
313  d = 4 * (3 - b);
314  if (d <= 0) {
315  lut[2 * a] = c;
316  lut[2 * a + 1] = 0;
317  } else {
318  for (int j = 0; j < 1 << d; j++) {
319  uint32_t f = 0xFFFFFFFFu;
320  c &= 0xFFFFFFu;
321  if ((c & 0xFF00u) != 0x8000u)
322  fill_elements(j, d, &c, &f);
323  lut[2 * a + 2 * j] = c;
324  lut[2 * a + 2 * j + 1] = f;
325  }
326  }
327  }
328 
329  for (int i = 0; i < 32; i += 2) {
330  lut[i ] = 0x68000;
331  lut[i+1] = 0;
332  }
333 }
334 
336 {
337  ProSumerContext *s = avctx->priv_data;
338 
339  s->stride = 3LL * FFALIGN(avctx->width, 8) >> 1;
340  s->size = avctx->height * s->stride;
341 
342  avctx->pix_fmt = AV_PIX_FMT_YUV411P;
343 
344  s->initial_line = av_malloc(s->stride);
345  s->decbuffer = av_malloc(s->size);
346  if (!s->initial_line || !s->decbuffer)
347  return AVERROR(ENOMEM);
348  memset(s->initial_line, 0x80u, s->stride);
349 
350  fill_lut(s->lut);
351 
352  return 0;
353 }
354 
356 {
357  ProSumerContext *s = avctx->priv_data;
358 
359  av_freep(&s->initial_line);
360  av_freep(&s->decbuffer);
361 
362  return 0;
363 }
364 
366  .p.name = "prosumer",
367  CODEC_LONG_NAME("Brooktree ProSumer Video"),
368  .p.type = AVMEDIA_TYPE_VIDEO,
369  .p.id = AV_CODEC_ID_PROSUMER,
370  .priv_data_size = sizeof(ProSumerContext),
371  .init = decode_init,
373  .close = decode_close,
374  .p.capabilities = AV_CODEC_CAP_DR1,
375  .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
376 };
ProSumerContext::gb
GetByteContext gb
Definition: prosumer.c:36
ProSumerContext::lut
uint32_t lut[0x2000]
Definition: prosumer.c:41
bytestream2_get_eof
static av_always_inline unsigned int bytestream2_get_eof(PutByteContext *p)
Definition: bytestream.h:332
FF_CODEC_CAP_INIT_CLEANUP
#define FF_CODEC_CAP_INIT_CLEANUP
The codec allows calling the close function for deallocation even if the init function returned a fai...
Definition: codec_internal.h:42
AVERROR
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions
decode_frame
static int decode_frame(AVCodecContext *avctx, AVFrame *frame, int *got_frame, AVPacket *avpkt)
Definition: prosumer.c:146
GetByteContext
Definition: bytestream.h:33
u
#define u(width, name, range_min, range_max)
Definition: cbs_h2645.c:251
ProSumerContext::size
unsigned size
Definition: prosumer.c:40
fill_elements
static void fill_elements(uint32_t idx, uint32_t shift, uint32_t *e0, uint32_t *e1)
Definition: prosumer.c:279
fill_lut
static void fill_lut(uint32_t *lut)
Definition: prosumer.c:305
ProSumerContext::initial_line
uint8_t * initial_line
Definition: prosumer.c:42
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:374
bytestream2_seek
static av_always_inline int bytestream2_seek(GetByteContext *g, int offset, int whence)
Definition: bytestream.h:212
AVPacket::data
uint8_t * data
Definition: packet.h:524
b
#define b
Definition: input.c:41
table
static const uint16_t table[]
Definition: prosumer.c:203
bytestream2_tell_p
static av_always_inline int bytestream2_tell_p(PutByteContext *p)
Definition: bytestream.h:197
PAIR
#define PAIR(high, low)
Definition: prosumer.c:46
FFCodec
Definition: codec_internal.h:126
av_malloc
#define av_malloc(s)
Definition: tableprint_vlc.h:30
decompress
static int decompress(GetByteContext *gb, int size, PutByteContext *pb, const uint32_t *lut)
Definition: prosumer.c:48
bytestream2_skip
static av_always_inline void bytestream2_skip(GetByteContext *g, unsigned int size)
Definition: bytestream.h:168
FFCodec::p
AVCodec p
The public AVCodec.
Definition: codec_internal.h:130
ProSumerContext
Definition: prosumer.c:35
bytestream2_get_bytes_left_p
static av_always_inline int bytestream2_get_bytes_left_p(PutByteContext *p)
Definition: bytestream.h:163
FF_ARRAY_ELEMS
#define FF_ARRAY_ELEMS(a)
Definition: sinewin_tablegen.c:29
av_cold
#define av_cold
Definition: attributes.h:90
bytestream2_init_writer
static av_always_inline void bytestream2_init_writer(PutByteContext *p, uint8_t *buf, int buf_size)
Definition: bytestream.h:147
FF_CODEC_DECODE_CB
#define FF_CODEC_DECODE_CB(func)
Definition: codec_internal.h:286
intreadwrite.h
s
#define s(width, name)
Definition: cbs_vp9.c:198
ProSumerContext::decbuffer
uint8_t * decbuffer
Definition: prosumer.c:43
av_assert0
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:40
decode.h
CODEC_LONG_NAME
#define CODEC_LONG_NAME(str)
Definition: codec_internal.h:271
c
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
Definition: undefined.txt:32
bytestream2_get_bytes_left
static av_always_inline int bytestream2_get_bytes_left(GetByteContext *g)
Definition: bytestream.h:158
bytestream2_tell
static av_always_inline int bytestream2_tell(GetByteContext *g)
Definition: bytestream.h:192
PutByteContext
Definition: bytestream.h:37
vertical_predict
static void vertical_predict(uint32_t *dst, int offset, const uint32_t *src, int stride, int height)
Definition: prosumer.c:132
f
f
Definition: af_crystalizer.c:121
ff_get_buffer
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: decode.c:1575
init
int(* init)(AVBSFContext *ctx)
Definition: dts2pts.c:366
AV_CODEC_CAP_DR1
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() or get_encode_buffer() for allocating buffers and supports custom allocators.
Definition: codec.h:52
AVPacket::size
int size
Definition: packet.h:525
codec_internal.h
decode_close
static av_cold int decode_close(AVCodecContext *avctx)
Definition: prosumer.c:355
shift
static int shift(int a, int b)
Definition: bonk.c:261
for
for(k=2;k<=8;++k)
Definition: h264pred_template.c:425
size
int size
Definition: twinvq_data.h:10344
height
#define height
a
The reader does not expect b to be semantically here and if the code is changed by maybe adding a a division or other the signedness will almost certainly be mistaken To avoid this confusion a new type was SUINT is the C unsigned type but it holds a signed int to use the same example SUINT a
Definition: undefined.txt:41
offset
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf offset
Definition: writing_filters.txt:86
decode_init
static av_cold int decode_init(AVCodecContext *avctx)
Definition: prosumer.c:335
TB
#define TB(i)
Definition: prosumer.c:202
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:256
internal.h
ProSumerContext::stride
unsigned stride
Definition: prosumer.c:39
AVCodec::name
const char * name
Name of the codec implementation.
Definition: codec.h:194
AVCodecContext::height
int height
Definition: avcodec.h:618
AVCodecContext::pix_fmt
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:657
avcodec.h
stride
#define stride
Definition: h264pred_template.c:537
ret
ret
Definition: filter_design.txt:187
frame
these buffered frames must be flushed immediately if a new input produces new the filter must not call request_frame to get more It must just process the frame or queue it The task of requesting more frames is left to the filter s request_frame method or the application If a filter has several the filter must be ready for frames arriving randomly on any input any filter with several inputs will most likely require some kind of queuing mechanism It is perfectly acceptable to have a limited queue and to drop frames when the inputs are too unbalanced request_frame For filters that do not use the this method is called when a frame is wanted on an output For a it should directly call filter_frame on the corresponding output For a if there are queued frames already one of these frames should be pushed If the filter should request a frame on one of its repeatedly until at least one frame has been pushed Return or at least make progress towards producing a frame
Definition: filter_design.txt:264
pos
unsigned int pos
Definition: spdifenc.c:414
AV_RL32
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:92
AV_CODEC_ID_PROSUMER
@ AV_CODEC_ID_PROSUMER
Definition: codec_id.h:288
AVCodecContext
main external API structure.
Definition: avcodec.h:445
ProSumerContext::pb
PutByteContext pb
Definition: prosumer.c:37
ff_prosumer_decoder
const FFCodec ff_prosumer_decoder
Definition: prosumer.c:365
AVCodecContext::discard_damaged_percentage
int discard_damaged_percentage
The percentage of damaged samples to discard a frame.
Definition: avcodec.h:1970
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
mem.h
FFALIGN
#define FFALIGN(x, a)
Definition: macros.h:78
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:472
AVPacket
This structure stores compressed data.
Definition: packet.h:501
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:34
src
INIT_CLIP pixel * src
Definition: h264pred_template.c:418
AV_PIX_FMT_YUV411P
@ AV_PIX_FMT_YUV411P
planar YUV 4:1:1, 12bpp, (1 Cr & Cb sample per 4x1 Y samples)
Definition: pixfmt.h:80
d
d
Definition: ffmpeg_filter.c:424
AVCodecContext::width
int width
picture width / height.
Definition: avcodec.h:618
bytestream.h
bytestream2_init
static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)
Definition: bytestream.h:137
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:61
h
h
Definition: vp9dsp_template.c:2038
AV_WN16
#define AV_WN16(p, v)
Definition: intreadwrite.h:370