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path: root/libavcodec/hq_hqa.c (plain)
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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
50static 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 uint8_t *p = pic->data[plane] + x;
55
56 c->hqhqadsp.idct_put(p + y * pic->linesize[plane],
57 pic->linesize[plane] << ilace, block0);
58 c->hqhqadsp.idct_put(p + (y + (ilace ? 1 : 8)) * pic->linesize[plane],
59 pic->linesize[plane] << ilace, block1);
60}
61
62static 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 int val, pos = 1;
67
68 memset(block, 0, 64 * sizeof(*block));
69
70 if (!is_hqa) {
71 block[0] = get_sbits(gb, 9) << 6;
72 q = ff_hq_quants[qsel][is_chroma][get_bits(gb, 2)];
73 } else {
74 q = ff_hq_quants[qsel][is_chroma][get_bits(gb, 2)];
75 block[0] = get_sbits(gb, 9) << 6;
76 }
77
78 for (;;) {
79 val = get_vlc2(gb, c->hq_ac_vlc.table, 9, 2);
80 if (val < 0)
81 return AVERROR_INVALIDDATA;
82
83 pos += ff_hq_ac_skips[val];
84 if (pos >= 64)
85 break;
86 block[ff_zigzag_direct[pos]] = (ff_hq_ac_syms[val] * q[pos]) >> 12;
87 pos++;
88 }
89
90 return 0;
91}
92
93static 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 qgroup = get_bits(gb, 4);
100 flag = get_bits1(gb);
101
102 for (i = 0; i < 8; i++) {
103 ret = hq_decode_block(c, gb, c->block[i], qgroup, i >= 4, 0);
104 if (ret < 0)
105 return ret;
106 }
107
108 put_blocks(c, pic, 0, x, y, flag, c->block[0], c->block[2]);
109 put_blocks(c, pic, 0, x + 8, y, flag, c->block[1], c->block[3]);
110 put_blocks(c, pic, 2, x >> 1, y, flag, c->block[4], c->block[5]);
111 put_blocks(c, pic, 1, x >> 1, y, flag, c->block[6], c->block[7]);
112
113 return 0;
114}
115
116static 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 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 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 profile = &ff_hq_profile[prof_num];
130 av_log(ctx->avctx, AV_LOG_VERBOSE, "HQ Profile %d\n", prof_num);
131 }
132
133 ctx->avctx->coded_width = FFALIGN(profile->width, 16);
134 ctx->avctx->coded_height = FFALIGN(profile->height, 16);
135 ctx->avctx->width = profile->width;
136 ctx->avctx->height = profile->height;
137 ctx->avctx->bits_per_raw_sample = 8;
138 ctx->avctx->pix_fmt = AV_PIX_FMT_YUV422P;
139
140 ret = ff_get_buffer(ctx->avctx, pic, 0);
141 if (ret < 0)
142 return ret;
143
144 /* Offsets are stored from CUV position, so adjust them accordingly. */
145 for (i = 0; i < profile->num_slices + 1; i++)
146 slice_off[i] = bytestream2_get_be24(&ctx->gbc) - 4;
147
148 next_off = 0;
149 for (slice = 0; slice < profile->num_slices; slice++) {
150 start_off = next_off;
151 next_off = profile->tab_h * (slice + 1) / profile->num_slices;
152 perm = profile->perm_tab + start_off * profile->tab_w * 2;
153
154 if (slice_off[slice] < (profile->num_slices + 1) * 3 ||
155 slice_off[slice] >= slice_off[slice + 1] ||
156 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 init_get_bits(&gb, src + slice_off[slice],
162 (slice_off[slice + 1] - slice_off[slice]) * 8);
163
164 for (i = 0; i < (next_off - start_off) * profile->tab_w; i++) {
165 ret = hq_decode_mb(ctx, pic, &gb, perm[0] * 16, perm[1] * 16);
166 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 perm += 2;
172 }
173 }
174
175 return 0;
176}
177
178static int hqa_decode_mb(HQContext *c, AVFrame *pic, int qgroup,
179 GetBitContext *gb, int x, int y)
180{
181 int flag = 0;
182 int i, ret, cbp;
183
184 cbp = get_vlc2(gb, c->hqa_cbp_vlc.table, 5, 1);
185
186 for (i = 0; i < 12; i++)
187 memset(c->block[i], 0, sizeof(*c->block));
188 for (i = 0; i < 12; i++)
189 c->block[i][0] = -128 * (1 << 6);
190
191 if (cbp) {
192 flag = get_bits1(gb);
193
194 cbp |= cbp << 4;
195 if (cbp & 0x3)
196 cbp |= 0x500;
197 if (cbp & 0xC)
198 cbp |= 0xA00;
199 for (i = 0; i < 12; i++) {
200 if (!(cbp & (1 << i)))
201 continue;
202 ret = hq_decode_block(c, gb, c->block[i], qgroup, i >= 8, 1);
203 if (ret < 0)
204 return ret;
205 }
206 }
207
208 put_blocks(c, pic, 3, x, y, flag, c->block[ 0], c->block[ 2]);
209 put_blocks(c, pic, 3, x + 8, y, flag, c->block[ 1], c->block[ 3]);
210 put_blocks(c, pic, 0, x, y, flag, c->block[ 4], c->block[ 6]);
211 put_blocks(c, pic, 0, x + 8, y, flag, c->block[ 5], c->block[ 7]);
212 put_blocks(c, pic, 2, x >> 1, y, flag, c->block[ 8], c->block[ 9]);
213 put_blocks(c, pic, 1, x >> 1, y, flag, c->block[10], c->block[11]);
214
215 return 0;
216}
217
218static int hqa_decode_slice(HQContext *ctx, AVFrame *pic, GetBitContext *gb,
219 int quant, int slice_no, int w, int h)
220{
221 int i, j, off;
222 int ret;
223
224 for (i = 0; i < h; i += 16) {
225 off = (slice_no * 16 + i * 3) & 0x70;
226 for (j = off; j < w; j += 128) {
227 ret = hqa_decode_mb(ctx, pic, quant, gb, j, i);
228 if (ret < 0) {
229 av_log(ctx->avctx, AV_LOG_ERROR,
230 "Error decoding macroblock at %dx%d.\n", i, j);
231 return ret;
232 }
233 }
234 }
235
236 return 0;
237}
238
239static int hqa_decode_frame(HQContext *ctx, AVFrame *pic, size_t data_size)
240{
241 GetBitContext gb;
242 const int num_slices = 8;
243 uint32_t slice_off[9];
244 int i, slice, ret;
245 int width, height, quant;
246 const uint8_t *src = ctx->gbc.buffer;
247
248 width = bytestream2_get_be16(&ctx->gbc);
249 height = bytestream2_get_be16(&ctx->gbc);
250
251 ctx->avctx->coded_width = FFALIGN(width, 16);
252 ctx->avctx->coded_height = FFALIGN(height, 16);
253 ctx->avctx->width = width;
254 ctx->avctx->height = height;
255 ctx->avctx->bits_per_raw_sample = 8;
256 ctx->avctx->pix_fmt = AV_PIX_FMT_YUVA422P;
257
258 av_log(ctx->avctx, AV_LOG_VERBOSE, "HQA Profile\n");
259
260 quant = bytestream2_get_byte(&ctx->gbc);
261 bytestream2_skip(&ctx->gbc, 3);
262 if (quant >= NUM_HQ_QUANTS) {
263 av_log(ctx->avctx, AV_LOG_ERROR,
264 "Invalid quantization matrix %d.\n", quant);
265 return AVERROR_INVALIDDATA;
266 }
267
268 ret = ff_get_buffer(ctx->avctx, pic, 0);
269 if (ret < 0)
270 return ret;
271
272 /* Offsets are stored from HQA1 position, so adjust them accordingly. */
273 for (i = 0; i < num_slices + 1; i++)
274 slice_off[i] = bytestream2_get_be32(&ctx->gbc) - 4;
275
276 for (slice = 0; slice < num_slices; slice++) {
277 if (slice_off[slice] < (num_slices + 1) * 3 ||
278 slice_off[slice] >= slice_off[slice + 1] ||
279 slice_off[slice + 1] > data_size) {
280 av_log(ctx->avctx, AV_LOG_ERROR,
281 "Invalid slice size %"SIZE_SPECIFIER".\n", data_size);
282 break;
283 }
284 init_get_bits(&gb, src + slice_off[slice],
285 (slice_off[slice + 1] - slice_off[slice]) * 8);
286
287 ret = hqa_decode_slice(ctx, pic, &gb, quant, slice, width, height);
288 if (ret < 0)
289 return ret;
290 }
291
292 return 0;
293}
294
295static int hq_hqa_decode_frame(AVCodecContext *avctx, void *data,
296 int *got_frame, AVPacket *avpkt)
297{
298 HQContext *ctx = avctx->priv_data;
299 AVFrame *pic = data;
300 uint32_t info_tag;
301 unsigned int data_size;
302 int ret;
303 unsigned tag;
304
305 bytestream2_init(&ctx->gbc, avpkt->data, avpkt->size);
306 if (bytestream2_get_bytes_left(&ctx->gbc) < 4 + 4) {
307 av_log(avctx, AV_LOG_ERROR, "Frame is too small (%d).\n", avpkt->size);
308 return AVERROR_INVALIDDATA;
309 }
310
311 info_tag = bytestream2_peek_le32(&ctx->gbc);
312 if (info_tag == MKTAG('I', 'N', 'F', 'O')) {
313 int info_size;
314 bytestream2_skip(&ctx->gbc, 4);
315 info_size = bytestream2_get_le32(&ctx->gbc);
316 if (bytestream2_get_bytes_left(&ctx->gbc) < info_size) {
317 av_log(avctx, AV_LOG_ERROR, "Invalid INFO size (%d).\n", info_size);
318 return AVERROR_INVALIDDATA;
319 }
320 ff_canopus_parse_info_tag(avctx, ctx->gbc.buffer, info_size);
321
322 bytestream2_skip(&ctx->gbc, info_size);
323 }
324
325 data_size = bytestream2_get_bytes_left(&ctx->gbc);
326 if (data_size < 4) {
327 av_log(avctx, AV_LOG_ERROR, "Frame is too small (%d).\n", data_size);
328 return AVERROR_INVALIDDATA;
329 }
330
331 /* HQ defines dimensions and number of slices, and thus slice traversal
332 * order. HQA has no size constraint and a fixed number of slices, so it
333 * needs a separate scheme for it. */
334 tag = bytestream2_get_le32(&ctx->gbc);
335 if ((tag & 0x00FFFFFF) == (MKTAG('U', 'V', 'C', ' ') & 0x00FFFFFF)) {
336 ret = hq_decode_frame(ctx, pic, tag >> 24, data_size);
337 } else if (tag == MKTAG('H', 'Q', 'A', '1')) {
338 ret = hqa_decode_frame(ctx, pic, data_size);
339 } else {
340 av_log(avctx, AV_LOG_ERROR, "Not a HQ/HQA frame.\n");
341 return AVERROR_INVALIDDATA;
342 }
343 if (ret < 0) {
344 av_log(avctx, AV_LOG_ERROR, "Error decoding frame.\n");
345 return ret;
346 }
347
348 pic->key_frame = 1;
349 pic->pict_type = AV_PICTURE_TYPE_I;
350
351 *got_frame = 1;
352
353 return avpkt->size;
354}
355
356static av_cold int hq_hqa_decode_init(AVCodecContext *avctx)
357{
358 HQContext *ctx = avctx->priv_data;
359 ctx->avctx = avctx;
360
361 ff_hqdsp_init(&ctx->hqhqadsp);
362
363 return ff_hq_init_vlcs(ctx);
364}
365
366static av_cold int hq_hqa_decode_close(AVCodecContext *avctx)
367{
368 HQContext *ctx = avctx->priv_data;
369
370 ff_free_vlc(&ctx->hq_ac_vlc);
371 ff_free_vlc(&ctx->hqa_cbp_vlc);
372
373 return 0;
374}
375
376AVCodec ff_hq_hqa_decoder = {
377 .name = "hq_hqa",
378 .long_name = NULL_IF_CONFIG_SMALL("Canopus HQ/HQA"),
379 .type = AVMEDIA_TYPE_VIDEO,
380 .id = AV_CODEC_ID_HQ_HQA,
381 .priv_data_size = sizeof(HQContext),
382 .init = hq_hqa_decode_init,
383 .decode = hq_hqa_decode_frame,
384 .close = hq_hqa_decode_close,
385 .capabilities = AV_CODEC_CAP_DR1,
386 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE |
387 FF_CODEC_CAP_INIT_CLEANUP,
388};
389
generated by cgit at 2024-05-17 02:03:51 (GMT)