FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/dvdec.c
Date: 2025-10-19 14:07:46
Exec Total Coverage
Lines: 288 331 87.0%
Functions: 7 10 70.0%
Branches: 154 178 86.5%
Line Branch Exec Source
1 /*
2 * DV decoder
3 * Copyright (c) 2002 Fabrice Bellard
4 * Copyright (c) 2004 Roman Shaposhnik
5 *
6 * 50 Mbps (DVCPRO50) support
7 * Copyright (c) 2006 Daniel Maas <dmaas@maasdigital.com>
8 *
9 * 100 Mbps (DVCPRO HD) support
10 * Initial code by Daniel Maas <dmaas@maasdigital.com> (funded by BBC R&D)
11 * Final code by Roman Shaposhnik
12 *
13 * Many thanks to Dan Dennedy <dan@dennedy.org> for providing wealth
14 * of DV technical info.
15 *
16 * This file is part of FFmpeg.
17 *
18 * FFmpeg is free software; you can redistribute it and/or
19 * modify it under the terms of the GNU Lesser General Public
20 * License as published by the Free Software Foundation; either
21 * version 2.1 of the License, or (at your option) any later version.
22 *
23 * FFmpeg is distributed in the hope that it will be useful,
24 * but WITHOUT ANY WARRANTY; without even the implied warranty of
25 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
26 * Lesser General Public License for more details.
27 *
28 * You should have received a copy of the GNU Lesser General Public
29 * License along with FFmpeg; if not, write to the Free Software
30 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
31 */
32
33 /**
34 * @file
35 * DV decoder
36 */
37
38 #include "libavutil/avassert.h"
39 #include "libavutil/emms.h"
40 #include "libavutil/internal.h"
41 #include "libavutil/mem_internal.h"
42 #include "libavutil/thread.h"
43
44 #include "avcodec.h"
45 #include "codec_internal.h"
46 #include "decode.h"
47 #include "dv.h"
48 #include "dv_internal.h"
49 #include "dv_profile_internal.h"
50 #include "dvdata.h"
51 #include "get_bits.h"
52 #include "idctdsp.h"
53 #include "put_bits.h"
54 #include "simple_idct.h"
55 #include "thread.h"
56
57 typedef struct BlockInfo {
58 const uint32_t *factor_table;
59 const uint8_t *scan_table;
60 uint8_t pos; /* position in block */
61 void (*idct_put)(uint8_t *dest, ptrdiff_t stride, int16_t *block);
62 uint8_t partial_bit_count;
63 uint32_t partial_bit_buffer;
64 int shift_offset;
65 } BlockInfo;
66
67 typedef struct DVDecContext {
68 const AVDVProfile *sys;
69 const AVFrame *frame;
70 const uint8_t *buf;
71
72 uint8_t dv_zigzag[2][64];
73 DVwork_chunk work_chunks[4 * 12 * 27];
74 uint32_t idct_factor[2 * 4 * 16 * 64];
75 void (*idct_put[2])(uint8_t *dest, ptrdiff_t stride, int16_t *block);
76
77 IDCTDSPContext idsp;
78 } DVDecContext;
79
80 static const int dv_iweight_bits = 14;
81
82 static const uint16_t dv_iweight_88[64] = {
83 32768, 16705, 16705, 17734, 17032, 17734, 18205, 18081,
84 18081, 18205, 18725, 18562, 19195, 18562, 18725, 19266,
85 19091, 19705, 19705, 19091, 19266, 21407, 19643, 20267,
86 20228, 20267, 19643, 21407, 22725, 21826, 20853, 20806,
87 20806, 20853, 21826, 22725, 23170, 23170, 21407, 21400,
88 21407, 23170, 23170, 24598, 23786, 22018, 22018, 23786,
89 24598, 25251, 24465, 22654, 24465, 25251, 25972, 25172,
90 25172, 25972, 26722, 27969, 26722, 29692, 29692, 31521,
91 };
92 static const uint16_t dv_iweight_248[64] = {
93 32768, 16384, 16705, 16705, 17734, 17734, 17734, 17734,
94 18081, 18081, 18725, 18725, 21407, 21407, 19091, 19091,
95 19195, 19195, 18205, 18205, 18725, 18725, 19705, 19705,
96 20267, 20267, 21826, 21826, 23170, 23170, 20806, 20806,
97 20267, 20267, 19266, 19266, 21407, 21407, 20853, 20853,
98 21400, 21400, 23786, 23786, 24465, 24465, 22018, 22018,
99 23170, 23170, 22725, 22725, 24598, 24598, 24465, 24465,
100 25172, 25172, 27969, 27969, 25972, 25972, 29692, 29692
101 };
102
103 /**
104 * The "inverse" DV100 weights are actually just the spec weights (zig-zagged).
105 */
106 static const uint16_t dv_iweight_1080_y[64] = {
107 128, 16, 16, 17, 17, 17, 18, 18,
108 18, 18, 18, 18, 19, 18, 18, 19,
109 19, 19, 19, 19, 19, 42, 38, 40,
110 40, 40, 38, 42, 44, 43, 41, 41,
111 41, 41, 43, 44, 45, 45, 42, 42,
112 42, 45, 45, 48, 46, 43, 43, 46,
113 48, 49, 48, 44, 48, 49, 101, 98,
114 98, 101, 104, 109, 104, 116, 116, 123,
115 };
116 static const uint16_t dv_iweight_1080_c[64] = {
117 128, 16, 16, 17, 17, 17, 25, 25,
118 25, 25, 26, 25, 26, 25, 26, 26,
119 26, 27, 27, 26, 26, 42, 38, 40,
120 40, 40, 38, 42, 44, 43, 41, 41,
121 41, 41, 43, 44, 91, 91, 84, 84,
122 84, 91, 91, 96, 93, 86, 86, 93,
123 96, 197, 191, 177, 191, 197, 203, 197,
124 197, 203, 209, 219, 209, 232, 232, 246,
125 };
126 static const uint16_t dv_iweight_720_y[64] = {
127 128, 16, 16, 17, 17, 17, 18, 18,
128 18, 18, 18, 18, 19, 18, 18, 19,
129 19, 19, 19, 19, 19, 42, 38, 40,
130 40, 40, 38, 42, 44, 43, 41, 41,
131 41, 41, 43, 44, 68, 68, 63, 63,
132 63, 68, 68, 96, 92, 86, 86, 92,
133 96, 98, 96, 88, 96, 98, 202, 196,
134 196, 202, 208, 218, 208, 232, 232, 246,
135 };
136 static const uint16_t dv_iweight_720_c[64] = {
137 128, 24, 24, 26, 26, 26, 36, 36,
138 36, 36, 36, 36, 38, 36, 36, 38,
139 38, 38, 38, 38, 38, 84, 76, 80,
140 80, 80, 76, 84, 88, 86, 82, 82,
141 82, 82, 86, 88, 182, 182, 168, 168,
142 168, 182, 182, 192, 186, 192, 172, 186,
143 192, 394, 382, 354, 382, 394, 406, 394,
144 394, 406, 418, 438, 418, 464, 464, 492,
145 };
146
147 #define TEX_VLC_BITS 10
148
149 /* XXX: also include quantization */
150 static RL_VLC_ELEM dv_rl_vlc[1664];
151
152 35 static av_cold void dv_init_static(void)
153 {
154 35 VLCElem vlc_buf[FF_ARRAY_ELEMS(dv_rl_vlc)] = { 0 };
155 35 VLC dv_vlc = { .table = vlc_buf, .table_allocated = FF_ARRAY_ELEMS(vlc_buf) };
156 35 const unsigned offset = FF_ARRAY_ELEMS(dv_rl_vlc) - (2 * NB_DV_VLC - NB_DV_ZERO_LEVEL_ENTRIES);
157 35 RL_VLC_ELEM *tmp = dv_rl_vlc + offset;
158 int i, j;
159
160 /* it's faster to include sign bit in a generic VLC parsing scheme */
161
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 14350 for (i = 0, j = 0; i < NB_DV_VLC; i++, j++) {
162 14315 tmp[j].len8 = ff_dv_vlc_len[i];
163 14315 tmp[j].run = ff_dv_vlc_run[i];
164 14315 tmp[j].level = ff_dv_vlc_level[i];
165
166
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 14315 if (ff_dv_vlc_level[i]) {
167 11795 tmp[j].len8++;
168
169 11795 j++;
170 11795 tmp[j].len8 = ff_dv_vlc_len[i] + 1;
171 11795 tmp[j].run = ff_dv_vlc_run[i];
172 11795 tmp[j].level = -ff_dv_vlc_level[i];
173 }
174 }
175
176 /* NOTE: as a trick, we use the fact the no codes are unused
177 * to accelerate the parsing of partial codes */
178 35 ff_vlc_init_from_lengths(&dv_vlc, TEX_VLC_BITS, j,
179 35 &tmp[0].len8, sizeof(tmp[0]),
180 NULL, 0, 0, 0, VLC_INIT_USE_STATIC, NULL);
181 av_assert1(dv_vlc.table_size == 1664);
182
183
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 58275 for (int i = 0; i < dv_vlc.table_size; i++) {
184 58240 int code = dv_vlc.table[i].sym;
185 58240 int len = dv_vlc.table[i].len;
186 int level, run;
187
188
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 58240 if (len < 0) { // more bits needed
189 1120 run = 0;
190 1120 level = code;
191 } else {
192 av_assert1(i <= code + offset);
193 57120 run = tmp[code].run + 1;
194 57120 level = tmp[code].level;
195 }
196 58240 dv_rl_vlc[i].len8 = len;
197 58240 dv_rl_vlc[i].level = level;
198 58240 dv_rl_vlc[i].run = run;
199 }
200 35 }
201
202 60 static void dv_init_weight_tables(DVDecContext *ctx, const AVDVProfile *d)
203 {
204 int j, i, c, s;
205 60 uint32_t *factor1 = &ctx->idct_factor[0],
206
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 60 *factor2 = &ctx->idct_factor[DV_PROFILE_IS_HD(d) ? 4096 : 2816];
207
208
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 60 if (DV_PROFILE_IS_HD(d)) {
209 /* quantization quanta by QNO for DV100 */
210 static const uint8_t dv100_qstep[16] = {
211 1, /* QNO = 0 and 1 both have no quantization */
212 1,
213 2, 3, 4, 5, 6, 7, 8, 16, 18, 20, 22, 24, 28, 52
214 };
215 const uint16_t *iweight1, *iweight2;
216
217
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 19 if (d->height == 720) {
218 9 iweight1 = &dv_iweight_720_y[0];
219 9 iweight2 = &dv_iweight_720_c[0];
220 } else {
221 10 iweight1 = &dv_iweight_1080_y[0];
222 10 iweight2 = &dv_iweight_1080_c[0];
223 }
224
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 95 for (c = 0; c < 4; c++) {
225
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 1292 for (s = 0; s < 16; s++) {
226
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 79040 for (i = 0; i < 64; i++) {
227 77824 *factor1++ = (dv100_qstep[s] << (c + 9)) * iweight1[i];
228 77824 *factor2++ = (dv100_qstep[s] << (c + 9)) * iweight2[i];
229 }
230 }
231 }
232 } else {
233 static const uint8_t dv_quant_areas[4] = { 6, 21, 43, 64 };
234 41 const uint16_t *iweight1 = &dv_iweight_88[0];
235
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 123 for (j = 0; j < 2; j++, iweight1 = &dv_iweight_248[0]) {
236
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 1886 for (s = 0; s < 22; s++) {
237
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 9020 for (i = c = 0; c < 4; c++) {
238
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 122672 for (; i < dv_quant_areas[c]; i++) {
239 115456 *factor1 = iweight1[i] << (ff_dv_quant_shifts[s][c] + 1);
240 115456 *factor2++ = (*factor1++) << 1;
241 }
242 }
243 }
244 }
245 }
246 60 }
247
248 62 static av_cold int dvvideo_decode_init(AVCodecContext *avctx)
249 {
250 static AVOnce init_static_once = AV_ONCE_INIT;
251 62 DVDecContext *s = avctx->priv_data;
252 int i;
253
254 62 avctx->chroma_sample_location = AVCHROMA_LOC_TOPLEFT;
255
256 62 ff_idctdsp_init(&s->idsp, avctx);
257
258
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 4030 for (i = 0; i < 64; i++)
259 3968 s->dv_zigzag[0][i] = s->idsp.idct_permutation[ff_zigzag_direct[i]];
260
261
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 62 if (avctx->lowres){
262 ✗ for (i = 0; i < 64; i++){
263 ✗ int j = ff_dv_zigzag248_direct[i];
264 ✗ s->dv_zigzag[1][i] = s->idsp.idct_permutation[(j & 7) + (j & 8) * 4 + (j & 48) / 2];
265 }
266 }else
267 62 memcpy(s->dv_zigzag[1], ff_dv_zigzag248_direct, sizeof(s->dv_zigzag[1]));
268
269 62 s->idct_put[0] = s->idsp.idct_put;
270 62 s->idct_put[1] = ff_simple_idct248_put;
271
272 62 ff_thread_once(&init_static_once, dv_init_static);
273
274 62 return 0;
275 }
276
277 /* decode AC coefficients */
278 32370770 static void dv_decode_ac(GetBitContext *gb, BlockInfo *mb, int16_t *block)
279 {
280 32370770 int last_index = gb->size_in_bits;
281 32370770 const uint8_t *scan_table = mb->scan_table;
282 32370770 const uint32_t *factor_table = mb->factor_table;
283 32370770 int pos = mb->pos;
284 32370770 int partial_bit_count = mb->partial_bit_count;
285 int level, run, vlc_len, index;
286
287 32370770 OPEN_READER_NOSIZE(re, gb);
288 32370770 UPDATE_CACHE(re, gb);
289
290 /* if we must parse a partial VLC, we do it here */
291
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 32370770 if (partial_bit_count > 0) {
292 7428217 re_cache = re_cache >> partial_bit_count |
293 7428217 mb->partial_bit_buffer;
294 7428217 re_index -= partial_bit_count;
295 7428217 mb->partial_bit_count = 0;
296 }
297
298 /* get the AC coefficients until last_index is reached */
299 for (;;) {
300 216755727 ff_dlog(NULL, "%2d: bits=%04"PRIx32" index=%u\n",
301 pos, SHOW_UBITS(re, gb, 16), re_index);
302 /* our own optimized GET_RL_VLC */
303 249126497 index = NEG_USR32(re_cache, TEX_VLC_BITS);
304 249126497 vlc_len = dv_rl_vlc[index].len8;
305
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 249126497 if (vlc_len < 0) {
306 19048052 index = NEG_USR32((unsigned) re_cache << TEX_VLC_BITS, -vlc_len) +
307 19048052 dv_rl_vlc[index].level;
308 19048052 vlc_len = TEX_VLC_BITS - vlc_len;
309 }
310 249126497 level = dv_rl_vlc[index].level;
311 249126497 run = dv_rl_vlc[index].run;
312
313 /* gotta check if we're still within gb boundaries */
314
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 249126497 if (re_index + vlc_len > last_index) {
315 /* should be < 16 bits otherwise a codeword could have been parsed */
316 8910972 mb->partial_bit_count = last_index - re_index;
317 8910972 mb->partial_bit_buffer = re_cache & ~(-1u >> mb->partial_bit_count);
318 8910972 re_index = last_index;
319 8910972 break;
320 }
321 240215525 re_index += vlc_len;
322
323 ff_dlog(NULL, "run=%d level=%d\n", run, level);
324 240215525 pos += run;
325
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 240215525 if (pos >= 64)
326 23459798 break;
327
328 216755727 level = (level * factor_table[pos] + (1 << (dv_iweight_bits - 1))) >>
329 dv_iweight_bits;
330 216755727 block[scan_table[pos]] = level;
331
332 216755727 UPDATE_CACHE(re, gb);
333 }
334 32370770 CLOSE_READER(re, gb);
335 32370770 mb->pos = pos;
336 32370770 }
337
338 17816092 static inline void bit_copy(PutBitContext *pb, GetBitContext *gb)
339 {
340 17816092 int bits_left = get_bits_left(gb);
341
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 55814454 while (bits_left >= MIN_CACHE_BITS) {
342 37998362 put_bits(pb, MIN_CACHE_BITS, get_bits(gb, MIN_CACHE_BITS));
343 37998362 bits_left -= MIN_CACHE_BITS;
344 }
345
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 17816092 if (bits_left > 0)
346 17191992 put_bits(pb, bits_left, get_bits(gb, bits_left));
347 17816092 }
348
349 ✗ static av_always_inline void put_block_8x4(int16_t *block, uint8_t *restrict p, int stride)
350 {
351 int i, j;
352
353 ✗ for (i = 0; i < 4; i++) {
354 ✗ for (j = 0; j < 8; j++)
355 ✗ p[j] = av_clip_uint8(block[j]);
356 ✗ block += 8;
357 ✗ p += stride;
358 }
359 ✗ }
360
361 ✗ static void dv100_idct_put_last_row_field_chroma(const DVDecContext *s, uint8_t *data,
362 int stride, int16_t *blocks)
363 {
364 ✗ s->idsp.idct(blocks + 0*64);
365 ✗ s->idsp.idct(blocks + 1*64);
366
367 ✗ put_block_8x4(blocks+0*64, data, stride<<1);
368 ✗ put_block_8x4(blocks+0*64 + 4*8, data + 8, stride<<1);
369 ✗ put_block_8x4(blocks+1*64, data + stride, stride<<1);
370 ✗ put_block_8x4(blocks+1*64 + 4*8, data + 8 + stride, stride<<1);
371 ✗ }
372
373 ✗ static void dv100_idct_put_last_row_field_luma(const DVDecContext *s, uint8_t *data,
374 int stride, int16_t *blocks)
375 {
376 ✗ s->idsp.idct(blocks + 0*64);
377 ✗ s->idsp.idct(blocks + 1*64);
378 ✗ s->idsp.idct(blocks + 2*64);
379 ✗ s->idsp.idct(blocks + 3*64);
380
381 ✗ put_block_8x4(blocks+0*64, data, stride<<1);
382 ✗ put_block_8x4(blocks+0*64 + 4*8, data + 16, stride<<1);
383 ✗ put_block_8x4(blocks+1*64, data + 8, stride<<1);
384 ✗ put_block_8x4(blocks+1*64 + 4*8, data + 24, stride<<1);
385 ✗ put_block_8x4(blocks+2*64, data + stride, stride<<1);
386 ✗ put_block_8x4(blocks+2*64 + 4*8, data + 16 + stride, stride<<1);
387 ✗ put_block_8x4(blocks+3*64, data + 8 + stride, stride<<1);
388 ✗ put_block_8x4(blocks+3*64 + 4*8, data + 24 + stride, stride<<1);
389 ✗ }
390
391 /* mb_x and mb_y are in units of 8 pixels */
392 652158 static int dv_decode_video_segment(AVCodecContext *avctx, void *arg)
393 {
394 652158 const DVDecContext *s = avctx->priv_data;
395 652158 DVwork_chunk *work_chunk = arg;
396 int quant, dc, dct_mode, class1, j;
397 int mb_index, mb_x, mb_y, last_index;
398 int y_stride, linesize;
399 int16_t *block, *block1;
400 int c_offset;
401 uint8_t *y_ptr;
402 const uint8_t *buf_ptr;
403 PutBitContext pb, vs_pb;
404 GetBitContext gb;
405 BlockInfo mb_data[5 * DV_MAX_BPM], *mb, *mb1;
406 652158 LOCAL_ALIGNED_16(int16_t, sblock, [5 * DV_MAX_BPM], [64]);
407 652158 LOCAL_ALIGNED_16(uint8_t, mb_bit_buffer, [80 + AV_INPUT_BUFFER_PADDING_SIZE]); /* allow some slack */
408 652158 LOCAL_ALIGNED_16(uint8_t, vs_bit_buffer, [80 * 5 + AV_INPUT_BUFFER_PADDING_SIZE]); /* allow some slack */
409 652158 const int log2_blocksize = 3 - avctx->lowres;
410 int is_field_mode[5];
411 652158 int vs_bit_buffer_damaged = 0;
412 652158 int mb_bit_buffer_damaged[5] = {0};
413 652158 int retried = 0;
414 int sta;
415
416 av_assert1((((uintptr_t) mb_bit_buffer) & 7) == 0);
417 av_assert1((((uintptr_t) vs_bit_buffer) & 7) == 0);
418
419 652159 retry:
420
421 652159 memset(sblock, 0, 5 * DV_MAX_BPM * sizeof(*sblock));
422
423 /* pass 1: read DC and AC coefficients in blocks */
424 652159 buf_ptr = &s->buf[work_chunk->buf_offset * 80];
425 652159 block1 = &sblock[0][0];
426 652159 mb1 = mb_data;
427 652159 init_put_bits(&vs_pb, vs_bit_buffer, 5 * 80);
428
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 3912954 for (mb_index = 0; mb_index < 5; mb_index++, mb1 += s->sys->bpm, block1 += s->sys->bpm * 64) {
429 /* skip header */
430 3260795 quant = buf_ptr[3] & 0x0f;
431
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 3260795 if (avctx->error_concealment) {
432
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 3260795 if ((buf_ptr[3] >> 4) == 0x0E)
433 ✗ vs_bit_buffer_damaged = 1;
434
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 3260795 if (!mb_index) {
435 652159 sta = buf_ptr[3] >> 4;
436
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 2608636 } else if (sta != (buf_ptr[3] >> 4))
437 ✗ vs_bit_buffer_damaged = 1;
438 }
439 3260795 buf_ptr += 4;
440 3260795 init_put_bits(&pb, mb_bit_buffer, 80);
441 3260795 mb = mb1;
442 3260795 block = block1;
443 3260795 is_field_mode[mb_index] = 0;
444
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 26727065 for (j = 0; j < s->sys->bpm; j++) {
445 23466270 last_index = s->sys->block_sizes[j];
446 23466270 init_get_bits(&gb, buf_ptr, last_index);
447
448 /* get the DC */
449 23466270 dc = get_sbits(&gb, 9);
450 23466270 dct_mode = get_bits1(&gb);
451 23466270 class1 = get_bits(&gb, 2);
452
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 23466270 if (DV_PROFILE_IS_HD(s->sys)) {
453 15606000 mb->idct_put = s->idct_put[0];
454 15606000 mb->scan_table = s->dv_zigzag[0];
455
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 15606000 mb->factor_table = &s->idct_factor[(j >= 4) * 4 * 16 * 64 +
456 15606000 class1 * 16 * 64 +
457 15606000 quant * 64];
458
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 15606000 is_field_mode[mb_index] |= !j && dct_mode;
459 } else {
460
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 7860270 mb->idct_put = s->idct_put[dct_mode && log2_blocksize == 3];
461 7860270 mb->scan_table = s->dv_zigzag[dct_mode];
462 7860270 mb->factor_table =
463
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 7860270 &s->idct_factor[(class1 == 3) * 2 * 22 * 64 +
464 7860270 dct_mode * 22 * 64 +
465 7860270 (quant + ff_dv_quant_offset[class1]) * 64];
466 }
467 23466270 dc = dc * 4;
468 /* convert to unsigned because 128 is not added in the
469 * standard IDCT */
470 23466270 dc += 1024;
471 23466270 block[0] = dc;
472 23466270 buf_ptr += last_index >> 3;
473 23466270 mb->pos = 0;
474 23466270 mb->partial_bit_count = 0;
475
476 ff_dlog(avctx, "MB block: %d, %d ", mb_index, j);
477 23466270 dv_decode_ac(&gb, mb, block);
478
479 /* write the remaining bits in a new buffer only if the
480 * block is finished */
481
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 23466270 if (mb->pos >= 64)
482 15599485 bit_copy(&pb, &gb);
483
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 23466270 if (mb->pos >= 64 && mb->pos < 127)
484 ✗ vs_bit_buffer_damaged = mb_bit_buffer_damaged[mb_index] = 1;
485
486 23466270 block += 64;
487 23466270 mb++;
488 }
489
490
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 3260795 if (mb_bit_buffer_damaged[mb_index] > 0)
491 1 continue;
492
493 /* pass 2: we can do it just after */
494 ff_dlog(avctx, "***pass 2 size=%d MB#=%d\n", put_bits_count(&pb), mb_index);
495 3260794 block = block1;
496 3260794 mb = mb1;
497 3260794 init_get_bits(&gb, mb_bit_buffer, put_bits_count(&pb));
498 3260794 put_bits32(&pb, 0); // padding must be zeroed
499 3260794 flush_put_bits(&pb);
500
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 20968612 for (j = 0; j < s->sys->bpm; j++, block += 64, mb++) {
501
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 18752005 if (mb->pos < 64 && get_bits_left(&gb) > 0) {
502 4666985 dv_decode_ac(&gb, mb, block);
503 /* if still not finished, no need to parse other blocks */
504
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 4666985 if (mb->pos < 64)
505 1044187 break;
506
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 3622798 if (mb->pos < 127)
507 2 vs_bit_buffer_damaged = mb_bit_buffer_damaged[mb_index] = 1;
508 }
509 }
510 /* all blocks are finished, so the extra bytes can be used at
511 * the video segment level */
512
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 3260794 if (j >= s->sys->bpm)
513 2216607 bit_copy(&vs_pb, &gb);
514 }
515
516 /* we need a pass over the whole video segment */
517 ff_dlog(avctx, "***pass 3 size=%d\n", put_bits_count(&vs_pb));
518 652159 block = &sblock[0][0];
519 652159 mb = mb_data;
520 652159 init_get_bits(&gb, vs_bit_buffer, put_bits_count(&vs_pb));
521 652159 put_bits32(&vs_pb, 0); // padding must be zeroed
522 652159 flush_put_bits(&vs_pb);
523
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 3912954 for (mb_index = 0; mb_index < 5; mb_index++) {
524
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 26727065 for (j = 0; j < s->sys->bpm; j++) {
525
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 23466270 if (mb->pos < 64 && get_bits_left(&gb) > 0 && !vs_bit_buffer_damaged) {
526 ff_dlog(avctx, "start %d:%d\n", mb_index, j);
527 4237515 dv_decode_ac(&gb, mb, block);
528 }
529
530
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 23466270 if (mb->pos >= 64 && mb->pos < 127) {
531 2 av_log(avctx, AV_LOG_ERROR,
532 2 "AC EOB marker is absent pos=%d\n", mb->pos);
533 2 vs_bit_buffer_damaged = 1;
534 }
535 23466270 block += 64;
536 23466270 mb++;
537 }
538 }
539
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 652159 if (vs_bit_buffer_damaged && !retried) {
540 1 av_log(avctx, AV_LOG_ERROR, "Concealing bitstream errors\n");
541 1 retried = 1;
542 1 goto retry;
543 }
544
545 /* compute idct and place blocks */
546 652158 block = &sblock[0][0];
547 652158 mb = mb_data;
548
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 3912948 for (mb_index = 0; mb_index < 5; mb_index++) {
549 3260790 dv_calculate_mb_xy(s->sys, s->buf, work_chunk, mb_index, &mb_x, &mb_y);
550
551 /* idct_put'ting luminance */
552
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 3260790 if ((s->sys->pix_fmt == AV_PIX_FMT_YUV420P) ||
553
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 2837970 (s->sys->pix_fmt == AV_PIX_FMT_YUV411P && mb_x >= (704 / 8)) ||
554
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 2831286 (s->sys->height >= 720 && mb_y != 134)) {
555 2369904 y_stride = (s->frame->linesize[0] <<
556 2369904 ((!is_field_mode[mb_index]) * log2_blocksize));
557 } else {
558 890886 y_stride = (2 << log2_blocksize);
559 }
560 3260790 y_ptr = s->frame->data[0] +
561 3260790 ((mb_y * s->frame->linesize[0] + mb_x) << log2_blocksize);
562
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 3260790 if (mb_y == 134 && is_field_mode[mb_index]) {
563 ✗ dv100_idct_put_last_row_field_luma(s, y_ptr, s->frame->linesize[0], block);
564 } else {
565 3260790 linesize = s->frame->linesize[0] << is_field_mode[mb_index];
566 3260790 mb[0].idct_put(y_ptr, linesize, block + 0 * 64);
567
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 3260790 if (s->sys->video_stype == 4) { /* SD 422 */
568 586440 mb[2].idct_put(y_ptr + (1 << log2_blocksize), linesize, block + 2 * 64);
569 } else {
570 2674350 mb[1].idct_put(y_ptr + (1 << log2_blocksize), linesize, block + 1 * 64);
571 2674350 mb[2].idct_put(y_ptr + y_stride, linesize, block + 2 * 64);
572 2674350 mb[3].idct_put(y_ptr + (1 << log2_blocksize) + y_stride, linesize, block + 3 * 64);
573 }
574 }
575 3260790 mb += 4;
576 3260790 block += 4 * 64;
577
578 /* idct_put'ting chrominance */
579 6521580 c_offset = (((mb_y >> (s->sys->pix_fmt == AV_PIX_FMT_YUV420P)) * s->frame->linesize[1] +
580
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 3260790 (mb_x >> ((s->sys->pix_fmt == AV_PIX_FMT_YUV411P) ? 2 : 1))) << log2_blocksize);
581
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 9782370 for (j = 2; j; j--) {
582 6521580 uint8_t *c_ptr = s->frame->data[j] + c_offset;
583
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 6521580 if (s->sys->pix_fmt == AV_PIX_FMT_YUV411P && mb_x >= (704 / 8)) {
584 uint64_t aligned_pixels[64 / 8];
585 13368 uint8_t *pixels = (uint8_t *) aligned_pixels;
586 uint8_t *c_ptr1, *ptr1;
587 int x, y;
588 13368 mb->idct_put(pixels, 8, block);
589
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 120312 for (y = 0; y < (1 << log2_blocksize); y++, c_ptr += s->frame->linesize[j], pixels += 8) {
590 106944 ptr1 = pixels + ((1 << (log2_blocksize))>>1);
591 106944 c_ptr1 = c_ptr + (s->frame->linesize[j] << log2_blocksize);
592
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 534720 for (x = 0; x < (1 << FFMAX(log2_blocksize - 1, 0)); x++) {
593 427776 c_ptr[x] = pixels[x];
594 427776 c_ptr1[x] = ptr1[x];
595 }
596 }
597 13368 block += 64;
598 13368 mb++;
599 } else {
600
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 6508212 y_stride = (mb_y == 134) ? (1 << log2_blocksize) :
601 6487512 s->frame->linesize[j] << ((!is_field_mode[mb_index]) * log2_blocksize);
602
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 6508212 if (mb_y == 134 && is_field_mode[mb_index]) {
603 ✗ dv100_idct_put_last_row_field_chroma(s, c_ptr, s->frame->linesize[j], block);
604 ✗ mb += 2;
605 ✗ block += 2*64;
606 } else {
607 6508212 linesize = s->frame->linesize[j] << is_field_mode[mb_index];
608 6508212 (mb++)->idct_put(c_ptr, linesize, block);
609 6508212 block += 64;
610
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 6508212 if (s->sys->bpm == 8) {
611 3901500 (mb++)->idct_put(c_ptr + y_stride, linesize, block);
612 3901500 block += 64;
613 }
614 }
615 }
616 }
617 }
618 652158 return 0;
619 }
620
621 /* NOTE: exactly one frame must be given (120000 bytes for NTSC,
622 * 144000 bytes for PAL - or twice those for 50Mbps) */
623 1069 static int dvvideo_decode_frame(AVCodecContext *avctx, AVFrame *frame,
624 int *got_frame, AVPacket *avpkt)
625 {
626 1069 uint8_t *buf = avpkt->data;
627 1069 int buf_size = avpkt->size;
628 1069 DVDecContext *s = avctx->priv_data;
629 const uint8_t *vsc_pack;
630 int apt, is16_9, ret;
631 const AVDVProfile *sys;
632
633 1069 sys = ff_dv_frame_profile(avctx, s->sys, buf, buf_size);
634
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 1069 if (!sys || buf_size < sys->frame_size) {
635 ✗ av_log(avctx, AV_LOG_ERROR, "could not find dv frame profile\n");
636 ✗ return -1; /* NOTE: we only accept several full frames */
637 }
638
639
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 1069 if (sys != s->sys) {
640 60 ff_dv_init_dynamic_tables(s->work_chunks, sys);
641 60 dv_init_weight_tables(s, sys);
642 60 s->sys = sys;
643 }
644
645 1069 s->frame = frame;
646 1069 avctx->pix_fmt = s->sys->pix_fmt;
647 1069 avctx->framerate = av_inv_q(s->sys->time_base);
648 1069 avctx->bit_rate = av_rescale_q(s->sys->frame_size,
649 1069 (AVRational) { 8, 1 },
650 1069 s->sys->time_base);
651
652 1069 ret = ff_set_dimensions(avctx, s->sys->width, s->sys->height);
653
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 1069 if (ret < 0)
654 ✗ return ret;
655
656 /* Determine the codec's sample_aspect ratio from the packet */
657 1069 vsc_pack = buf + 80 * 5 + 48 + 5;
658
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 1069 if (*vsc_pack == DV_VIDEO_CONTROL) {
659 1069 apt = buf[4] & 0x07;
660
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 1338 is16_9 = (vsc_pack[2] & 0x07) == 0x02 ||
661
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 269 (!apt && (vsc_pack[2] & 0x07) == 0x07);
662 1069 ff_set_sar(avctx, s->sys->sar[is16_9]);
663 }
664
665
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 1069 if ((ret = ff_thread_get_buffer(avctx, frame, 0)) < 0)
666 ✗ return ret;
667
668 /* Determine the codec's field order from the packet */
669
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 1069 if ( *vsc_pack == DV_VIDEO_CONTROL ) {
670
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 1069 if (avctx->height == 720) {
671 205 frame->flags &= ~AV_FRAME_FLAG_INTERLACED;
672 205 frame->flags &= ~AV_FRAME_FLAG_TOP_FIELD_FIRST;
673
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 864 } else if (avctx->height == 1080) {
674 230 frame->flags |= AV_FRAME_FLAG_INTERLACED;
675 230 frame->flags |= AV_FRAME_FLAG_TOP_FIELD_FIRST * ((vsc_pack[3] & 0x40) == 0x40);
676 } else {
677 634 frame->flags |= AV_FRAME_FLAG_INTERLACED * ((vsc_pack[3] & 0x10) == 0x10);
678
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 634 frame->flags |= AV_FRAME_FLAG_TOP_FIELD_FIRST * !(vsc_pack[3] & 0x40);
679 }
680 }
681
682 1069 s->buf = buf;
683 1069 avctx->execute(avctx, dv_decode_video_segment, s->work_chunks, NULL,
684 dv_work_pool_size(s->sys), sizeof(DVwork_chunk));
685
686 1069 emms_c();
687
688 /* return image */
689 1069 *got_frame = 1;
690
691 1069 return s->sys->frame_size;
692 }
693
694 const FFCodec ff_dvvideo_decoder = {
695 .p.name = "dvvideo",
696 CODEC_LONG_NAME("DV (Digital Video)"),
697 .p.type = AVMEDIA_TYPE_VIDEO,
698 .p.id = AV_CODEC_ID_DVVIDEO,
699 .priv_data_size = sizeof(DVDecContext),
700 .init = dvvideo_decode_init,
701 FF_CODEC_DECODE_CB(dvvideo_decode_frame),
702 .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS | AV_CODEC_CAP_SLICE_THREADS,
703 .p.max_lowres = 3,
704 };
705