FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/hq_hqa.c
Date: 2021-09-24 20:55:06
Exec Total Coverage
Lines: 161 192 83.9%
Branches: 64 90 71.1%

Line Branch Exec Source
1 /*
2 * Canopus HQ/HQA decoder
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21 #include <stdint.h>
22
23 #include "libavutil/attributes.h"
24 #include "libavutil/intreadwrite.h"
25
26 #include "avcodec.h"
27 #include "canopus.h"
28 #include "get_bits.h"
29 #include "internal.h"
30
31 #include "hq_hqa.h"
32 #include "hq_hqadsp.h"
33
34 /* HQ/HQA slices are a set of macroblocks belonging to a frame, and
35 * they usually form a pseudorandom pattern (probably because it is
36 * nicer to display on partial decode).
37 *
38 * For HQA it just happens that each slice is on every 8th macroblock,
39 * but they can be on any frame width like
40 * X.......X.
41 * ......X...
42 * ....X.....
43 * ..X.......
44 * etc.
45 *
46 * The original decoder has special handling for edge macroblocks,
47 * while lavc simply aligns coded_width and coded_height.
48 */
49
50 221520 static inline void put_blocks(HQContext *c, AVFrame *pic,
51 int plane, int x, int y, int ilace,
52 int16_t *block0, int16_t *block1)
53 {
54 221520 uint8_t *p = pic->data[plane] + x;
55
56 221520 c->hqhqadsp.idct_put(p + y * pic->linesize[plane],
57 221520 pic->linesize[plane] << ilace, block0);
58 221520 c->hqhqadsp.idct_put(p + (y + (ilace ? 1 : 8)) * pic->linesize[plane],
59
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221520 pic->linesize[plane] << ilace, block1);
60 221520 }
61
62 365300 static int hq_decode_block(HQContext *c, GetBitContext *gb, int16_t block[64],
63 int qsel, int is_chroma, int is_hqa)
64 {
65 const int32_t *q;
66 365300 int val, pos = 1;
67
68 365300 memset(block, 0, 64 * sizeof(*block));
69
70
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365300 if (!is_hqa) {
71 247200 block[0] = get_sbits(gb, 9) * 64;
72 247200 q = ff_hq_quants[qsel][is_chroma][get_bits(gb, 2)];
73 } else {
74 118100 q = ff_hq_quants[qsel][is_chroma][get_bits(gb, 2)];
75 118100 block[0] = get_sbits(gb, 9) * 64;
76 }
77
78 for (;;) {
79 5841374 val = get_vlc2(gb, c->hq_ac_vlc.table, 9, 2);
80
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5841374 if (val < 0)
81 return AVERROR_INVALIDDATA;
82
83 5841374 pos += ff_hq_ac_skips[val];
84
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5841374 if (pos >= 64)
85 365300 break;
86 5476074 block[ff_zigzag_direct[pos]] = (int)(ff_hq_ac_syms[val] * (unsigned)q[pos]) >> 12;
87 5476074 pos++;
88 }
89
90 365300 return 0;
91 }
92
93 30900 static int hq_decode_mb(HQContext *c, AVFrame *pic,
94 GetBitContext *gb, int x, int y)
95 {
96 int qgroup, flag;
97 int i, ret;
98
99 30900 qgroup = get_bits(gb, 4);
100 30900 flag = get_bits1(gb);
101
102
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278100 for (i = 0; i < 8; i++) {
103 247200 ret = hq_decode_block(c, gb, c->block[i], qgroup, i >= 4, 0);
104
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247200 if (ret < 0)
105 return ret;
106 }
107
108 30900 put_blocks(c, pic, 0, x, y, flag, c->block[0], c->block[2]);
109 30900 put_blocks(c, pic, 0, x + 8, y, flag, c->block[1], c->block[3]);
110 30900 put_blocks(c, pic, 2, x >> 1, y, flag, c->block[4], c->block[5]);
111 30900 put_blocks(c, pic, 1, x >> 1, y, flag, c->block[6], c->block[7]);
112
113 30900 return 0;
114 }
115
116 11 static int hq_decode_frame(HQContext *ctx, AVFrame *pic,
117 int prof_num, size_t data_size)
118 {
119 const HQProfile *profile;
120 GetBitContext gb;
121 11 const uint8_t *perm, *src = ctx->gbc.buffer;
122 uint32_t slice_off[21];
123 int slice, start_off, next_off, i, ret;
124
125
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11 if ((unsigned)prof_num >= NUM_HQ_PROFILES) {
126 profile = &ff_hq_profile[0];
127 avpriv_request_sample(ctx->avctx, "HQ Profile %d", prof_num);
128 } else {
129 11 profile = &ff_hq_profile[prof_num];
130 11 av_log(ctx->avctx, AV_LOG_VERBOSE, "HQ Profile %d\n", prof_num);
131 }
132
133 11 ctx->avctx->coded_width = FFALIGN(profile->width, 16);
134 11 ctx->avctx->coded_height = FFALIGN(profile->height, 16);
135 11 ctx->avctx->width = profile->width;
136 11 ctx->avctx->height = profile->height;
137 11 ctx->avctx->bits_per_raw_sample = 8;
138 11 ctx->avctx->pix_fmt = AV_PIX_FMT_YUV422P;
139
140 11 ret = ff_get_buffer(ctx->avctx, pic, 0);
141
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11 if (ret < 0)
142 return ret;
143
144 /* Offsets are stored from CUV position, so adjust them accordingly. */
145
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134 for (i = 0; i < profile->num_slices + 1; i++)
146 123 slice_off[i] = bytestream2_get_be24(&ctx->gbc) - 4;
147
148 11 next_off = 0;
149
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123 for (slice = 0; slice < profile->num_slices; slice++) {
150 112 start_off = next_off;
151 112 next_off = profile->tab_h * (slice + 1) / profile->num_slices;
152 112 perm = profile->perm_tab + start_off * profile->tab_w * 2;
153
154
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112 if (slice_off[slice] < (profile->num_slices + 1) * 3 ||
155
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112 slice_off[slice] >= slice_off[slice + 1] ||
156
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112 slice_off[slice + 1] > data_size) {
157 av_log(ctx->avctx, AV_LOG_ERROR,
158 "Invalid slice size %"SIZE_SPECIFIER".\n", data_size);
159 break;
160 }
161 112 init_get_bits(&gb, src + slice_off[slice],
162 112 (slice_off[slice + 1] - slice_off[slice]) * 8);
163
164
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31012 for (i = 0; i < (next_off - start_off) * profile->tab_w; i++) {
165 30900 ret = hq_decode_mb(ctx, pic, &gb, perm[0] * 16, perm[1] * 16);
166
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30900 if (ret < 0) {
167 av_log(ctx->avctx, AV_LOG_ERROR,
168 "Error decoding macroblock %d at slice %d.\n", i, slice);
169 return ret;
170 }
171 30900 perm += 2;
172 }
173 }
174
175 11 return 0;
176 }
177
178 16320 static int hqa_decode_mb(HQContext *c, AVFrame *pic, int qgroup,
179 GetBitContext *gb, int x, int y)
180 {
181 16320 int flag = 0;
182 int i, ret, cbp;
183
184
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16320 if (get_bits_left(gb) < 1)
185 return AVERROR_INVALIDDATA;
186
187 16320 cbp = get_vlc2(gb, c->hqa_cbp_vlc.table, 5, 1);
188
189
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212160 for (i = 0; i < 12; i++)
190 195840 memset(c->block[i], 0, sizeof(*c->block));
191
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212160 for (i = 0; i < 12; i++)
192 195840 c->block[i][0] = -128 * (1 << 6);
193
194
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16320 if (cbp) {
195 9978 flag = get_bits1(gb);
196
197 9978 cbp |= cbp << 4;
198
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9978 if (cbp & 0x3)
199 9890 cbp |= 0x500;
200
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9978 if (cbp & 0xC)
201 9874 cbp |= 0xA00;
202
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129714 for (i = 0; i < 12; i++) {
203
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119736 if (!(cbp & (1 << i)))
204 1636 continue;
205 118100 ret = hq_decode_block(c, gb, c->block[i], qgroup, i >= 8, 1);
206
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118100 if (ret < 0)
207 return ret;
208 }
209 }
210
211 16320 put_blocks(c, pic, 3, x, y, flag, c->block[ 0], c->block[ 2]);
212 16320 put_blocks(c, pic, 3, x + 8, y, flag, c->block[ 1], c->block[ 3]);
213 16320 put_blocks(c, pic, 0, x, y, flag, c->block[ 4], c->block[ 6]);
214 16320 put_blocks(c, pic, 0, x + 8, y, flag, c->block[ 5], c->block[ 7]);
215 16320 put_blocks(c, pic, 2, x >> 1, y, flag, c->block[ 8], c->block[ 9]);
216 16320 put_blocks(c, pic, 1, x >> 1, y, flag, c->block[10], c->block[11]);
217
218 16320 return 0;
219 }
220
221 16 static int hqa_decode_slice(HQContext *ctx, AVFrame *pic, GetBitContext *gb,
222 int quant, int slice_no, int w, int h)
223 {
224 int i, j, off;
225 int ret;
226
227
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1104 for (i = 0; i < h; i += 16) {
228 1088 off = (slice_no * 16 + i * 3) & 0x70;
229
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17408 for (j = off; j < w; j += 128) {
230 16320 ret = hqa_decode_mb(ctx, pic, quant, gb, j, i);
231
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16320 if (ret < 0) {
232 av_log(ctx->avctx, AV_LOG_ERROR,
233 "Error decoding macroblock at %dx%d.\n", i, j);
234 return ret;
235 }
236 }
237 }
238
239 16 return 0;
240 }
241
242 2 static int hqa_decode_frame(HQContext *ctx, AVFrame *pic, size_t data_size)
243 {
244 GetBitContext gb;
245 2 const int num_slices = 8;
246 uint32_t slice_off[9];
247 int i, slice, ret;
248 int width, height, quant;
249 2 const uint8_t *src = ctx->gbc.buffer;
250
251
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2 if (bytestream2_get_bytes_left(&ctx->gbc) < 8 + 4*(num_slices + 1))
252 return AVERROR_INVALIDDATA;
253
254 2 width = bytestream2_get_be16(&ctx->gbc);
255 2 height = bytestream2_get_be16(&ctx->gbc);
256
257 2 ret = ff_set_dimensions(ctx->avctx, width, height);
258
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2 if (ret < 0)
259 return ret;
260
261 2 ctx->avctx->coded_width = FFALIGN(width, 16);
262 2 ctx->avctx->coded_height = FFALIGN(height, 16);
263 2 ctx->avctx->bits_per_raw_sample = 8;
264 2 ctx->avctx->pix_fmt = AV_PIX_FMT_YUVA422P;
265
266 2 av_log(ctx->avctx, AV_LOG_VERBOSE, "HQA Profile\n");
267
268 2 quant = bytestream2_get_byte(&ctx->gbc);
269 2 bytestream2_skip(&ctx->gbc, 3);
270
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2 if (quant >= NUM_HQ_QUANTS) {
271 av_log(ctx->avctx, AV_LOG_ERROR,
272 "Invalid quantization matrix %d.\n", quant);
273 return AVERROR_INVALIDDATA;
274 }
275
276 2 ret = ff_get_buffer(ctx->avctx, pic, 0);
277
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2 if (ret < 0)
278 return ret;
279
280 /* Offsets are stored from HQA1 position, so adjust them accordingly. */
281
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20 for (i = 0; i < num_slices + 1; i++)
282 18 slice_off[i] = bytestream2_get_be32(&ctx->gbc) - 4;
283
284
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18 for (slice = 0; slice < num_slices; slice++) {
285
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16 if (slice_off[slice] < (num_slices + 1) * 3 ||
286
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16 slice_off[slice] >= slice_off[slice + 1] ||
287
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16 slice_off[slice + 1] > data_size) {
288 av_log(ctx->avctx, AV_LOG_ERROR,
289 "Invalid slice size %"SIZE_SPECIFIER".\n", data_size);
290 break;
291 }
292 16 init_get_bits(&gb, src + slice_off[slice],
293 16 (slice_off[slice + 1] - slice_off[slice]) * 8);
294
295 16 ret = hqa_decode_slice(ctx, pic, &gb, quant, slice, width, height);
296
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16 if (ret < 0)
297 return ret;
298 }
299
300 2 return 0;
301 }
302
303 13 static int hq_hqa_decode_frame(AVCodecContext *avctx, void *data,
304 int *got_frame, AVPacket *avpkt)
305 {
306 13 HQContext *ctx = avctx->priv_data;
307 13 AVFrame *pic = data;
308 uint32_t info_tag;
309 unsigned int data_size;
310 int ret;
311 unsigned tag;
312
313 13 bytestream2_init(&ctx->gbc, avpkt->data, avpkt->size);
314
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13 if (bytestream2_get_bytes_left(&ctx->gbc) < 4 + 4) {
315 av_log(avctx, AV_LOG_ERROR, "Frame is too small (%d).\n", avpkt->size);
316 return AVERROR_INVALIDDATA;
317 }
318
319 13 info_tag = bytestream2_peek_le32(&ctx->gbc);
320
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13 if (info_tag == MKTAG('I', 'N', 'F', 'O')) {
321 int info_size;
322 13 bytestream2_skip(&ctx->gbc, 4);
323 13 info_size = bytestream2_get_le32(&ctx->gbc);
324
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13 if (info_size < 0 || bytestream2_get_bytes_left(&ctx->gbc) < info_size) {
325 av_log(avctx, AV_LOG_ERROR, "Invalid INFO size (%d).\n", info_size);
326 return AVERROR_INVALIDDATA;
327 }
328 13 ff_canopus_parse_info_tag(avctx, ctx->gbc.buffer, info_size);
329
330 13 bytestream2_skip(&ctx->gbc, info_size);
331 }
332
333 13 data_size = bytestream2_get_bytes_left(&ctx->gbc);
334
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13 if (data_size < 4) {
335 av_log(avctx, AV_LOG_ERROR, "Frame is too small (%d).\n", data_size);
336 return AVERROR_INVALIDDATA;
337 }
338
339 /* HQ defines dimensions and number of slices, and thus slice traversal
340 * order. HQA has no size constraint and a fixed number of slices, so it
341 * needs a separate scheme for it. */
342 13 tag = bytestream2_get_le32(&ctx->gbc);
343
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13 if ((tag & 0x00FFFFFF) == (MKTAG('U', 'V', 'C', ' ') & 0x00FFFFFF)) {
344 11 ret = hq_decode_frame(ctx, pic, tag >> 24, data_size);
345
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2 } else if (tag == MKTAG('H', 'Q', 'A', '1')) {
346 2 ret = hqa_decode_frame(ctx, pic, data_size);
347 } else {
348 av_log(avctx, AV_LOG_ERROR, "Not a HQ/HQA frame.\n");
349 return AVERROR_INVALIDDATA;
350 }
351
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13 if (ret < 0) {
352 av_log(avctx, AV_LOG_ERROR, "Error decoding frame.\n");
353 return ret;
354 }
355
356 13 pic->key_frame = 1;
357 13 pic->pict_type = AV_PICTURE_TYPE_I;
358
359 13 *got_frame = 1;
360
361 13 return avpkt->size;
362 }
363
364 6 static av_cold int hq_hqa_decode_init(AVCodecContext *avctx)
365 {
366 6 HQContext *ctx = avctx->priv_data;
367 6 ctx->avctx = avctx;
368
369 6 ff_hqdsp_init(&ctx->hqhqadsp);
370
371 6 return ff_hq_init_vlcs(ctx);
372 }
373
374 6 static av_cold int hq_hqa_decode_close(AVCodecContext *avctx)
375 {
376 6 HQContext *ctx = avctx->priv_data;
377
378 6 ff_free_vlc(&ctx->hq_ac_vlc);
379 6 ff_free_vlc(&ctx->hqa_cbp_vlc);
380
381 6 return 0;
382 }
383
384 const AVCodec ff_hq_hqa_decoder = {
385 .name = "hq_hqa",
386 .long_name = NULL_IF_CONFIG_SMALL("Canopus HQ/HQA"),
387 .type = AVMEDIA_TYPE_VIDEO,
388 .id = AV_CODEC_ID_HQ_HQA,
389 .priv_data_size = sizeof(HQContext),
390 .init = hq_hqa_decode_init,
391 .decode = hq_hqa_decode_frame,
392 .close = hq_hqa_decode_close,
393 .capabilities = AV_CODEC_CAP_DR1,
394 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE |
395 FF_CODEC_CAP_INIT_CLEANUP,
396 };
397