FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/hapdec.c
Date: 2021-09-24 03:35:22
Exec Total Coverage
Lines: 220 268 82.1%
Branches: 91 137 66.4%

Line Branch Exec Source
1 /*
2 * Vidvox Hap decoder
3 * Copyright (C) 2015 Vittorio Giovara <vittorio.giovara@gmail.com>
4 * Copyright (C) 2015 Tom Butterworth <bangnoise@gmail.com>
5 *
6 * HapQA and HAPAlphaOnly added by Jokyo Images
7 *
8 * This file is part of FFmpeg.
9 *
10 * FFmpeg is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU Lesser General Public
12 * License as published by the Free Software Foundation; either
13 * version 2.1 of the License, or (at your option) any later version.
14 *
15 * FFmpeg is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * Lesser General Public License for more details.
19 *
20 * You should have received a copy of the GNU Lesser General Public
21 * License along with FFmpeg; if not, write to the Free Software
22 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 */
24
25 /**
26 * @file
27 * Hap decoder
28 *
29 * Fourcc: Hap1, Hap5, HapY, HapA, HapM
30 *
31 * https://github.com/Vidvox/hap/blob/master/documentation/HapVideoDRAFT.md
32 */
33
34 #include <stdint.h>
35
36 #include "libavutil/imgutils.h"
37
38 #include "avcodec.h"
39 #include "bytestream.h"
40 #include "hap.h"
41 #include "internal.h"
42 #include "snappy.h"
43 #include "texturedsp.h"
44 #include "thread.h"
45
46 6 static int hap_parse_decode_instructions(HapContext *ctx, int size)
47 {
48 6 GetByteContext *gbc = &ctx->gbc;
49 int section_size;
50 enum HapSectionType section_type;
51 6 int is_first_table = 1, had_offsets = 0, had_compressors = 0, had_sizes = 0;
52 int i, ret;
53
54
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18 while (size > 0) {
55 12 int stream_remaining = bytestream2_get_bytes_left(gbc);
56 12 ret = ff_hap_parse_section_header(gbc, &section_size, &section_type);
57
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12 if (ret != 0)
58 return ret;
59
60 12 size -= stream_remaining - bytestream2_get_bytes_left(gbc);
61
62
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12 switch (section_type) {
63 6 case HAP_ST_COMPRESSOR_TABLE:
64 6 ret = ff_hap_set_chunk_count(ctx, section_size, is_first_table);
65
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6 if (ret != 0)
66 return ret;
67
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53 for (i = 0; i < section_size; i++) {
68 47 ctx->chunks[i].compressor = bytestream2_get_byte(gbc) << 4;
69 }
70 6 had_compressors = 1;
71 6 is_first_table = 0;
72 6 break;
73 6 case HAP_ST_SIZE_TABLE:
74 6 ret = ff_hap_set_chunk_count(ctx, section_size / 4, is_first_table);
75
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6 if (ret != 0)
76 return ret;
77
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53 for (i = 0; i < section_size / 4; i++) {
78 47 ctx->chunks[i].compressed_size = bytestream2_get_le32(gbc);
79 }
80 6 had_sizes = 1;
81 6 is_first_table = 0;
82 6 break;
83 case HAP_ST_OFFSET_TABLE:
84 ret = ff_hap_set_chunk_count(ctx, section_size / 4, is_first_table);
85 if (ret != 0)
86 return ret;
87 for (i = 0; i < section_size / 4; i++) {
88 ctx->chunks[i].compressed_offset = bytestream2_get_le32(gbc);
89 }
90 had_offsets = 1;
91 is_first_table = 0;
92 break;
93 default:
94 break;
95 }
96 12 size -= section_size;
97 }
98
99
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6 if (!had_sizes || !had_compressors)
100 return AVERROR_INVALIDDATA;
101
102 /* The offsets table is optional. If not present than calculate offsets by
103 * summing the sizes of preceding chunks. */
104
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6 if (!had_offsets) {
105 6 size_t running_size = 0;
106
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53 for (i = 0; i < ctx->chunk_count; i++) {
107 47 ctx->chunks[i].compressed_offset = running_size;
108
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47 if (ctx->chunks[i].compressed_size > UINT32_MAX - running_size)
109 return AVERROR_INVALIDDATA;
110 47 running_size += ctx->chunks[i].compressed_size;
111 }
112 }
113
114 6 return 0;
115 }
116
117 12 static int hap_can_use_tex_in_place(HapContext *ctx)
118 {
119 int i;
120 12 size_t running_offset = 0;
121
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15 for (i = 0; i < ctx->chunk_count; i++) {
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12 if (ctx->chunks[i].compressed_offset != running_offset
123
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12 || ctx->chunks[i].compressor != HAP_COMP_NONE)
124 9 return 0;
125 3 running_offset += ctx->chunks[i].compressed_size;
126 }
127 3 return 1;
128 }
129
130 12 static int hap_parse_frame_header(AVCodecContext *avctx)
131 {
132 12 HapContext *ctx = avctx->priv_data;
133 12 GetByteContext *gbc = &ctx->gbc;
134 int section_size;
135 enum HapSectionType section_type;
136 const char *compressorstr;
137 int i, ret;
138
139 12 ret = ff_hap_parse_section_header(gbc, &ctx->texture_section_size, &section_type);
140
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12 if (ret != 0)
141 return ret;
142
143
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12 if ((avctx->codec_tag == MKTAG('H','a','p','1') && (section_type & 0x0F) != HAP_FMT_RGBDXT1) ||
144
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12 (avctx->codec_tag == MKTAG('H','a','p','5') && (section_type & 0x0F) != HAP_FMT_RGBADXT5) ||
145
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12 (avctx->codec_tag == MKTAG('H','a','p','Y') && (section_type & 0x0F) != HAP_FMT_YCOCGDXT5) ||
146
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12 (avctx->codec_tag == MKTAG('H','a','p','A') && (section_type & 0x0F) != HAP_FMT_RGTC1) ||
147
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12 ((avctx->codec_tag == MKTAG('H','a','p','M') && (section_type & 0x0F) != HAP_FMT_RGTC1) &&
148
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3 (section_type & 0x0F) != HAP_FMT_YCOCGDXT5)) {
149 av_log(avctx, AV_LOG_ERROR,
150 "Invalid texture format %#04x.\n", section_type & 0x0F);
151 return AVERROR_INVALIDDATA;
152 }
153
154
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12 switch (section_type & 0xF0) {
155 6 case HAP_COMP_NONE:
156 case HAP_COMP_SNAPPY:
157 6 ret = ff_hap_set_chunk_count(ctx, 1, 1);
158
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6 if (ret == 0) {
159 6 ctx->chunks[0].compressor = section_type & 0xF0;
160 6 ctx->chunks[0].compressed_offset = 0;
161 6 ctx->chunks[0].compressed_size = ctx->texture_section_size;
162 }
163
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6 if (ctx->chunks[0].compressor == HAP_COMP_NONE) {
164 3 compressorstr = "none";
165 } else {
166 3 compressorstr = "snappy";
167 }
168 6 break;
169 6 case HAP_COMP_COMPLEX:
170 6 ret = ff_hap_parse_section_header(gbc, &section_size, &section_type);
171
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6 if (ret == 0 && section_type != HAP_ST_DECODE_INSTRUCTIONS)
172 ret = AVERROR_INVALIDDATA;
173
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6 if (ret == 0)
174 6 ret = hap_parse_decode_instructions(ctx, section_size);
175 6 compressorstr = "complex";
176 6 break;
177 default:
178 ret = AVERROR_INVALIDDATA;
179 break;
180 }
181
182
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12 if (ret != 0)
183 return ret;
184
185 /* Check the frame is valid and read the uncompressed chunk sizes */
186 12 ctx->tex_size = 0;
187
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65 for (i = 0; i < ctx->chunk_count; i++) {
188 53 HapChunk *chunk = &ctx->chunks[i];
189
190 /* Check the compressed buffer is valid */
191
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53 if (chunk->compressed_offset + (uint64_t)chunk->compressed_size > bytestream2_get_bytes_left(gbc))
192 return AVERROR_INVALIDDATA;
193
194 /* Chunks are unpacked sequentially, ctx->tex_size is the uncompressed
195 * size thus far */
196 53 chunk->uncompressed_offset = ctx->tex_size;
197
198 /* Fill out uncompressed size */
199
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53 if (chunk->compressor == HAP_COMP_SNAPPY) {
200 GetByteContext gbc_tmp;
201 int64_t uncompressed_size;
202 50 bytestream2_init(&gbc_tmp, gbc->buffer + chunk->compressed_offset,
203 50 chunk->compressed_size);
204 50 uncompressed_size = ff_snappy_peek_uncompressed_length(&gbc_tmp);
205
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50 if (uncompressed_size < 0) {
206 return uncompressed_size;
207 }
208 50 chunk->uncompressed_size = uncompressed_size;
209
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3 } else if (chunk->compressor == HAP_COMP_NONE) {
210 3 chunk->uncompressed_size = chunk->compressed_size;
211 } else {
212 return AVERROR_INVALIDDATA;
213 }
214 53 ctx->tex_size += chunk->uncompressed_size;
215 }
216
217 12 av_log(avctx, AV_LOG_DEBUG, "%s compressor\n", compressorstr);
218
219 12 return ret;
220 }
221
222 50 static int decompress_chunks_thread(AVCodecContext *avctx, void *arg,
223 int chunk_nb, int thread_nb)
224 {
225 50 HapContext *ctx = avctx->priv_data;
226
227 50 HapChunk *chunk = &ctx->chunks[chunk_nb];
228 GetByteContext gbc;
229 50 uint8_t *dst = ctx->tex_buf + chunk->uncompressed_offset;
230
231 50 bytestream2_init(&gbc, ctx->gbc.buffer + chunk->compressed_offset, chunk->compressed_size);
232
233
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50 if (chunk->compressor == HAP_COMP_SNAPPY) {
234 int ret;
235 50 int64_t uncompressed_size = ctx->tex_size;
236
237 /* Uncompress the frame */
238 50 ret = ff_snappy_uncompress(&gbc, dst, &uncompressed_size);
239
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50 if (ret < 0) {
240 av_log(avctx, AV_LOG_ERROR, "Snappy uncompress error\n");
241 return ret;
242 }
243 } else if (chunk->compressor == HAP_COMP_NONE) {
244 bytestream2_get_buffer(&gbc, dst, chunk->compressed_size);
245 }
246
247 50 return 0;
248 }
249
250 12 static int decompress_texture_thread_internal(AVCodecContext *avctx, void *arg,
251 int slice, int thread_nb, int texture_num)
252 {
253 12 HapContext *ctx = avctx->priv_data;
254 12 AVFrame *frame = arg;
255 12 const uint8_t *d = ctx->tex_data;
256 12 int w_block = avctx->coded_width / TEXTURE_BLOCK_W;
257 12 int h_block = avctx->coded_height / TEXTURE_BLOCK_H;
258 int x, y;
259 int start_slice, end_slice;
260 12 int base_blocks_per_slice = h_block / ctx->slice_count;
261 12 int remainder_blocks = h_block % ctx->slice_count;
262
263 /* When the frame height (in blocks) doesn't divide evenly between the
264 * number of slices, spread the remaining blocks evenly between the first
265 * operations */
266 12 start_slice = slice * base_blocks_per_slice;
267 /* Add any extra blocks (one per slice) that have been added before this slice */
268 12 start_slice += FFMIN(slice, remainder_blocks);
269
270 12 end_slice = start_slice + base_blocks_per_slice;
271 /* Add an extra block if there are still remainder blocks to be accounted for */
272
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12 if (slice < remainder_blocks)
273 end_slice++;
274
275
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532 for (y = start_slice; y < end_slice; y++) {
276 520 uint8_t *p = frame->data[0] + y * frame->linesize[0] * TEXTURE_BLOCK_H;
277 520 int off = y * w_block;
278
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62984 for (x = 0; x < w_block; x++) {
279
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62464 if (texture_num == 0) {
280 60736 ctx->tex_fun(p + x * 4 * ctx->uncompress_pix_size, frame->linesize[0],
281 60736 d + (off + x) * ctx->tex_rat);
282 } else {
283 1728 ctx->tex_fun2(p + x * 4 * ctx->uncompress_pix_size, frame->linesize[0],
284 1728 d + (off + x) * ctx->tex_rat2);
285 }
286 }
287 }
288
289 12 return 0;
290 }
291
292 9 static int decompress_texture_thread(AVCodecContext *avctx, void *arg,
293 int slice, int thread_nb)
294 {
295 9 return decompress_texture_thread_internal(avctx, arg, slice, thread_nb, 0);
296 }
297
298 3 static int decompress_texture2_thread(AVCodecContext *avctx, void *arg,
299 int slice, int thread_nb)
300 {
301 3 return decompress_texture_thread_internal(avctx, arg, slice, thread_nb, 1);
302 }
303
304 9 static int hap_decode(AVCodecContext *avctx, void *data,
305 int *got_frame, AVPacket *avpkt)
306 {
307 9 HapContext *ctx = avctx->priv_data;
308 ThreadFrame tframe;
309 int ret, i, t;
310 int section_size;
311 enum HapSectionType section_type;
312 9 int start_texture_section = 0;
313 9 int tex_rat[2] = {0, 0};
314
315 9 bytestream2_init(&ctx->gbc, avpkt->data, avpkt->size);
316
317 9 tex_rat[0] = ctx->tex_rat;
318
319 /* check for multi texture header */
320
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9 if (ctx->texture_count == 2) {
321 3 ret = ff_hap_parse_section_header(&ctx->gbc, &section_size, &section_type);
322
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3 if (ret != 0)
323 return ret;
324
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3 if ((section_type & 0x0F) != 0x0D) {
325 av_log(avctx, AV_LOG_ERROR, "Invalid section type in 2 textures mode %#04x.\n", section_type);
326 return AVERROR_INVALIDDATA;
327 }
328 3 start_texture_section = 4;
329 3 tex_rat[1] = ctx->tex_rat2;
330 }
331
332 /* Get the output frame ready to receive data */
333 9 tframe.f = data;
334 9 ret = ff_thread_get_buffer(avctx, &tframe, 0);
335
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9 if (ret < 0)
336 return ret;
337
338
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21 for (t = 0; t < ctx->texture_count; t++) {
339 12 bytestream2_seek(&ctx->gbc, start_texture_section, SEEK_SET);
340
341 /* Check for section header */
342 12 ret = hap_parse_frame_header(avctx);
343
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12 if (ret < 0)
344 return ret;
345
346 12 if (ctx->tex_size != (avctx->coded_width / TEXTURE_BLOCK_W)
347 12 *(avctx->coded_height / TEXTURE_BLOCK_H)
348
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12 *tex_rat[t]) {
349 av_log(avctx, AV_LOG_ERROR, "uncompressed size mismatches\n");
350 return AVERROR_INVALIDDATA;
351 }
352
353 12 start_texture_section += ctx->texture_section_size + 4;
354
355
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12 if (avctx->codec->update_thread_context)
356 ff_thread_finish_setup(avctx);
357
358 /* Unpack the DXT texture */
359
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12 if (hap_can_use_tex_in_place(ctx)) {
360 int tex_size;
361 /* Only DXTC texture compression in a contiguous block */
362 3 ctx->tex_data = ctx->gbc.buffer;
363
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3 tex_size = FFMIN(ctx->texture_section_size, bytestream2_get_bytes_left(&ctx->gbc));
364 3 if (tex_size < (avctx->coded_width / TEXTURE_BLOCK_W)
365 3 *(avctx->coded_height / TEXTURE_BLOCK_H)
366
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3 *tex_rat[t]) {
367 av_log(avctx, AV_LOG_ERROR, "Insufficient data\n");
368 return AVERROR_INVALIDDATA;
369 }
370 } else {
371 /* Perform the second-stage decompression */
372 9 ret = av_reallocp(&ctx->tex_buf, ctx->tex_size);
373
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9 if (ret < 0)
374 return ret;
375
376 9 avctx->execute2(avctx, decompress_chunks_thread, NULL,
377 ctx->chunk_results, ctx->chunk_count);
378
379
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59 for (i = 0; i < ctx->chunk_count; i++) {
380
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50 if (ctx->chunk_results[i] < 0)
381 return ctx->chunk_results[i];
382 }
383
384 9 ctx->tex_data = ctx->tex_buf;
385 }
386
387 /* Use the decompress function on the texture, one block per thread */
388
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12 if (t == 0){
389 9 avctx->execute2(avctx, decompress_texture_thread, tframe.f, NULL, ctx->slice_count);
390 } else{
391 3 tframe.f = data;
392 3 avctx->execute2(avctx, decompress_texture2_thread, tframe.f, NULL, ctx->slice_count);
393 }
394 }
395
396 /* Frame is ready to be output */
397 9 tframe.f->pict_type = AV_PICTURE_TYPE_I;
398 9 tframe.f->key_frame = 1;
399 9 *got_frame = 1;
400
401 9 return avpkt->size;
402 }
403
404 28 static av_cold int hap_init(AVCodecContext *avctx)
405 {
406 28 HapContext *ctx = avctx->priv_data;
407 const char *texture_name;
408 28 int ret = av_image_check_size(avctx->width, avctx->height, 0, avctx);
409
410
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28 if (ret < 0) {
411 av_log(avctx, AV_LOG_ERROR, "Invalid video size %dx%d.\n",
412 avctx->width, avctx->height);
413 return ret;
414 }
415
416 /* Since codec is based on 4x4 blocks, size is aligned to 4 */
417 28 avctx->coded_width = FFALIGN(avctx->width, TEXTURE_BLOCK_W);
418 28 avctx->coded_height = FFALIGN(avctx->height, TEXTURE_BLOCK_H);
419
420 28 ff_texturedsp_init(&ctx->dxtc);
421
422 28 ctx->texture_count = 1;
423 28 ctx->uncompress_pix_size = 4;
424
425
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28 switch (avctx->codec_tag) {
426 2 case MKTAG('H','a','p','1'):
427 2 texture_name = "DXT1";
428 2 ctx->tex_rat = 8;
429 2 ctx->tex_fun = ctx->dxtc.dxt1_block;
430 2 avctx->pix_fmt = AV_PIX_FMT_RGB0;
431 2 break;
432 2 case MKTAG('H','a','p','5'):
433 2 texture_name = "DXT5";
434 2 ctx->tex_rat = 16;
435 2 ctx->tex_fun = ctx->dxtc.dxt5_block;
436 2 avctx->pix_fmt = AV_PIX_FMT_RGBA;
437 2 break;
438 6 case MKTAG('H','a','p','Y'):
439 6 texture_name = "DXT5-YCoCg-scaled";
440 6 ctx->tex_rat = 16;
441 6 ctx->tex_fun = ctx->dxtc.dxt5ys_block;
442 6 avctx->pix_fmt = AV_PIX_FMT_RGB0;
443 6 break;
444 6 case MKTAG('H','a','p','A'):
445 6 texture_name = "RGTC1";
446 6 ctx->tex_rat = 8;
447 6 ctx->tex_fun = ctx->dxtc.rgtc1u_gray_block;
448 6 avctx->pix_fmt = AV_PIX_FMT_GRAY8;
449 6 ctx->uncompress_pix_size = 1;
450 6 break;
451 12 case MKTAG('H','a','p','M'):
452 12 texture_name = "DXT5-YCoCg-scaled / RGTC1";
453 12 ctx->tex_rat = 16;
454 12 ctx->tex_rat2 = 8;
455 12 ctx->tex_fun = ctx->dxtc.dxt5ys_block;
456 12 ctx->tex_fun2 = ctx->dxtc.rgtc1u_alpha_block;
457 12 avctx->pix_fmt = AV_PIX_FMT_RGBA;
458 12 ctx->texture_count = 2;
459 12 break;
460 default:
461 return AVERROR_DECODER_NOT_FOUND;
462 }
463
464 28 av_log(avctx, AV_LOG_DEBUG, "%s texture\n", texture_name);
465
466 28 ctx->slice_count = av_clip(avctx->thread_count, 1,
467 28 avctx->coded_height / TEXTURE_BLOCK_H);
468
469 28 return 0;
470 }
471
472 28 static av_cold int hap_close(AVCodecContext *avctx)
473 {
474 28 HapContext *ctx = avctx->priv_data;
475
476 28 ff_hap_free_context(ctx);
477
478 28 return 0;
479 }
480
481 const AVCodec ff_hap_decoder = {
482 .name = "hap",
483 .long_name = NULL_IF_CONFIG_SMALL("Vidvox Hap"),
484 .type = AVMEDIA_TYPE_VIDEO,
485 .id = AV_CODEC_ID_HAP,
486 .init = hap_init,
487 .decode = hap_decode,
488 .close = hap_close,
489 .priv_data_size = sizeof(HapContext),
490 .capabilities = AV_CODEC_CAP_FRAME_THREADS | AV_CODEC_CAP_SLICE_THREADS |
491 AV_CODEC_CAP_DR1,
492 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE |
493 FF_CODEC_CAP_INIT_CLEANUP,
494 .codec_tags = (const uint32_t []){
495 MKTAG('H','a','p','1'),
496 MKTAG('H','a','p','5'),
497 MKTAG('H','a','p','Y'),
498 MKTAG('H','a','p','A'),
499 MKTAG('H','a','p','M'),
500 FF_CODEC_TAGS_END,
501 },
502 };
503