FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/hapdec.c
Date: 2026-01-08 00:53:43
Exec Total Coverage
Lines: 191 237 80.6%
Functions: 7 7 100.0%
Branches: 81 125 64.8%
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 #include "libavutil/mem.h"
38
39 #include "avcodec.h"
40 #include "bytestream.h"
41 #include "codec_internal.h"
42 #include "hap.h"
43 #include "snappy.h"
44 #include "texturedsp.h"
45 #include "thread.h"
46
47 6 static int hap_parse_decode_instructions(HapContext *ctx, int size)
48 {
49 6 GetByteContext *gbc = &ctx->gbc;
50 int section_size;
51 enum HapSectionType section_type;
52 6 int is_first_table = 1, had_offsets = 0, had_compressors = 0, had_sizes = 0;
53 int i, ret;
54
55
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 18 while (size > 0) {
56 12 int stream_remaining = bytestream2_get_bytes_left(gbc);
57 12 ret = ff_hap_parse_section_header(gbc, &section_size, &section_type);
58
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 12 if (ret != 0)
59 ✗ return ret;
60
61 12 size -= stream_remaining - bytestream2_get_bytes_left(gbc);
62
63
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 12 switch (section_type) {
64 6 case HAP_ST_COMPRESSOR_TABLE:
65 6 ret = ff_hap_set_chunk_count(ctx, section_size, is_first_table);
66
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 6 if (ret != 0)
67 ✗ return ret;
68
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 53 for (i = 0; i < section_size; i++) {
69 47 ctx->chunks[i].compressor = bytestream2_get_byte(gbc) << 4;
70 }
71 6 had_compressors = 1;
72 6 is_first_table = 0;
73 6 break;
74 6 case HAP_ST_SIZE_TABLE:
75 6 ret = ff_hap_set_chunk_count(ctx, section_size / 4, is_first_table);
76
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 6 if (ret != 0)
77 ✗ return ret;
78
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 53 for (i = 0; i < section_size / 4; i++) {
79 47 ctx->chunks[i].compressed_size = bytestream2_get_le32(gbc);
80 }
81 6 had_sizes = 1;
82 6 is_first_table = 0;
83 6 break;
84 ✗ case HAP_ST_OFFSET_TABLE:
85 ✗ ret = ff_hap_set_chunk_count(ctx, section_size / 4, is_first_table);
86 ✗ if (ret != 0)
87 ✗ return ret;
88 ✗ for (i = 0; i < section_size / 4; i++) {
89 ✗ ctx->chunks[i].compressed_offset = bytestream2_get_le32(gbc);
90 }
91 ✗ had_offsets = 1;
92 ✗ is_first_table = 0;
93 ✗ break;
94 ✗ default:
95 ✗ break;
96 }
97 12 size -= section_size;
98 }
99
100
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 6 if (!had_sizes || !had_compressors)
101 ✗ return AVERROR_INVALIDDATA;
102
103 /* The offsets table is optional. If not present than calculate offsets by
104 * summing the sizes of preceding chunks. */
105
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 6 if (!had_offsets) {
106 6 size_t running_size = 0;
107
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 53 for (i = 0; i < ctx->chunk_count; i++) {
108 47 ctx->chunks[i].compressed_offset = running_size;
109
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 47 if (ctx->chunks[i].compressed_size > UINT32_MAX - running_size)
110 ✗ return AVERROR_INVALIDDATA;
111 47 running_size += ctx->chunks[i].compressed_size;
112 }
113 }
114
115 6 return 0;
116 }
117
118 12 static int hap_can_use_tex_in_place(HapContext *ctx)
119 {
120 int i;
121 12 size_t running_offset = 0;
122
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 15 for (i = 0; i < ctx->chunk_count; i++) {
123
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 12 if (ctx->chunks[i].compressed_offset != running_offset
124
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 12 || ctx->chunks[i].compressor != HAP_COMP_NONE)
125 9 return 0;
126 3 running_offset += ctx->chunks[i].compressed_size;
127 }
128 3 return 1;
129 }
130
131 12 static int hap_parse_frame_header(AVCodecContext *avctx)
132 {
133 12 HapContext *ctx = avctx->priv_data;
134 12 GetByteContext *gbc = &ctx->gbc;
135 int section_size;
136 enum HapSectionType section_type;
137 const char *compressorstr;
138 int i, ret;
139
140 12 ret = ff_hap_parse_section_header(gbc, &ctx->texture_section_size, &section_type);
141
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 12 if (ret != 0)
142 ✗ return ret;
143
144
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 12 if ((avctx->codec_tag == MKTAG('H','a','p','1') && (section_type & 0x0F) != HAP_FMT_RGBDXT1) ||
145
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 12 (avctx->codec_tag == MKTAG('H','a','p','5') && (section_type & 0x0F) != HAP_FMT_RGBADXT5) ||
146
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 12 (avctx->codec_tag == MKTAG('H','a','p','Y') && (section_type & 0x0F) != HAP_FMT_YCOCGDXT5) ||
147
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 12 (avctx->codec_tag == MKTAG('H','a','p','A') && (section_type & 0x0F) != HAP_FMT_RGTC1) ||
148
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 12 ((avctx->codec_tag == MKTAG('H','a','p','M') && (section_type & 0x0F) != HAP_FMT_RGTC1) &&
149
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 3 (section_type & 0x0F) != HAP_FMT_YCOCGDXT5)) {
150 ✗ av_log(avctx, AV_LOG_ERROR,
151 "Invalid texture format %#04x.\n", section_type & 0x0F);
152 ✗ return AVERROR_INVALIDDATA;
153 }
154
155
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 12 switch (section_type & 0xF0) {
156 6 case HAP_COMP_NONE:
157 case HAP_COMP_SNAPPY:
158 6 ret = ff_hap_set_chunk_count(ctx, 1, 1);
159
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 6 if (ret == 0) {
160 6 ctx->chunks[0].compressor = section_type & 0xF0;
161 6 ctx->chunks[0].compressed_offset = 0;
162 6 ctx->chunks[0].compressed_size = ctx->texture_section_size;
163 }
164
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 6 if (ctx->chunks[0].compressor == HAP_COMP_NONE) {
165 3 compressorstr = "none";
166 } else {
167 3 compressorstr = "snappy";
168 }
169 6 break;
170 6 case HAP_COMP_COMPLEX:
171 6 ret = ff_hap_parse_section_header(gbc, &section_size, &section_type);
172
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 6 if (ret == 0 && section_type != HAP_ST_DECODE_INSTRUCTIONS)
173 ✗ ret = AVERROR_INVALIDDATA;
174
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 6 if (ret == 0)
175 6 ret = hap_parse_decode_instructions(ctx, section_size);
176 6 compressorstr = "complex";
177 6 break;
178 ✗ default:
179 ✗ ret = AVERROR_INVALIDDATA;
180 ✗ break;
181 }
182
183
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 12 if (ret != 0)
184 ✗ return ret;
185
186 /* Check the frame is valid and read the uncompressed chunk sizes */
187 12 ctx->tex_size = 0;
188
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 65 for (i = 0; i < ctx->chunk_count; i++) {
189 53 HapChunk *chunk = &ctx->chunks[i];
190
191 /* Check the compressed buffer is valid */
192
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 53 if (chunk->compressed_offset + (uint64_t)chunk->compressed_size > bytestream2_get_bytes_left(gbc))
193 ✗ return AVERROR_INVALIDDATA;
194
195 /* Chunks are unpacked sequentially, ctx->tex_size is the uncompressed
196 * size thus far */
197 53 chunk->uncompressed_offset = ctx->tex_size;
198
199 /* Fill out uncompressed size */
200
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 53 if (chunk->compressor == HAP_COMP_SNAPPY) {
201 GetByteContext gbc_tmp;
202 int64_t uncompressed_size;
203 50 bytestream2_init(&gbc_tmp, gbc->buffer + chunk->compressed_offset,
204 50 chunk->compressed_size);
205 50 uncompressed_size = ff_snappy_peek_uncompressed_length(&gbc_tmp);
206
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 50 if (uncompressed_size < 0) {
207 ✗ return uncompressed_size;
208 }
209 50 chunk->uncompressed_size = uncompressed_size;
210
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 3 } else if (chunk->compressor == HAP_COMP_NONE) {
211 3 chunk->uncompressed_size = chunk->compressed_size;
212 } else {
213 ✗ return AVERROR_INVALIDDATA;
214 }
215 53 ctx->tex_size += chunk->uncompressed_size;
216 }
217
218 12 av_log(avctx, AV_LOG_DEBUG, "%s compressor\n", compressorstr);
219
220 12 return ret;
221 }
222
223 50 static int decompress_chunks_thread(AVCodecContext *avctx, void *arg,
224 int chunk_nb, int thread_nb)
225 {
226 50 HapContext *ctx = avctx->priv_data;
227
228 50 HapChunk *chunk = &ctx->chunks[chunk_nb];
229 GetByteContext gbc;
230 50 uint8_t *dst = ctx->tex_buf + chunk->uncompressed_offset;
231
232 50 bytestream2_init(&gbc, ctx->gbc.buffer + chunk->compressed_offset, chunk->compressed_size);
233
234
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 50 if (chunk->compressor == HAP_COMP_SNAPPY) {
235 int ret;
236 50 int64_t uncompressed_size = ctx->tex_size;
237
238 /* Uncompress the frame */
239 50 ret = ff_snappy_uncompress(&gbc, dst, &uncompressed_size);
240
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 50 if (ret < 0) {
241 ✗ av_log(avctx, AV_LOG_ERROR, "Snappy uncompress error\n");
242 ✗ return ret;
243 }
244 ✗ } else if (chunk->compressor == HAP_COMP_NONE) {
245 ✗ bytestream2_get_buffer(&gbc, dst, chunk->compressed_size);
246 }
247
248 50 return 0;
249 }
250
251 9 static int hap_decode(AVCodecContext *avctx, AVFrame *frame,
252 int *got_frame, AVPacket *avpkt)
253 {
254 9 HapContext *ctx = avctx->priv_data;
255 int ret, i, t;
256 int section_size;
257 enum HapSectionType section_type;
258 9 int start_texture_section = 0;
259
260 9 bytestream2_init(&ctx->gbc, avpkt->data, avpkt->size);
261
262 /* check for multi texture header */
263
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 9 if (ctx->texture_count == 2) {
264 3 ret = ff_hap_parse_section_header(&ctx->gbc, &section_size, &section_type);
265
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 3 if (ret != 0)
266 ✗ return ret;
267
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 3 if ((section_type & 0x0F) != 0x0D) {
268 ✗ av_log(avctx, AV_LOG_ERROR, "Invalid section type in 2 textures mode %#04x.\n", section_type);
269 ✗ return AVERROR_INVALIDDATA;
270 }
271 3 start_texture_section = 4;
272 }
273
274 /* Get the output frame ready to receive data */
275 9 ret = ff_thread_get_buffer(avctx, frame, 0);
276
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 9 if (ret < 0)
277 ✗ return ret;
278
279
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 21 for (t = 0; t < ctx->texture_count; t++) {
280 12 bytestream2_seek(&ctx->gbc, start_texture_section, SEEK_SET);
281
282 /* Check for section header */
283 12 ret = hap_parse_frame_header(avctx);
284
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 12 if (ret < 0)
285 ✗ return ret;
286
287 12 if (ctx->tex_size != (avctx->coded_width / TEXTURE_BLOCK_W)
288 12 *(avctx->coded_height / TEXTURE_BLOCK_H)
289
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 12 *ctx->dec[t].tex_ratio) {
290 ✗ av_log(avctx, AV_LOG_ERROR, "uncompressed size mismatches\n");
291 ✗ return AVERROR_INVALIDDATA;
292 }
293
294 12 start_texture_section += ctx->texture_section_size + 4;
295
296 /* Unpack the DXT texture */
297
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 12 if (hap_can_use_tex_in_place(ctx)) {
298 int tex_size;
299 /* Only DXTC texture compression in a contiguous block */
300 3 ctx->dec[t].tex_data.in = ctx->gbc.buffer;
301
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 3 tex_size = FFMIN(ctx->texture_section_size, bytestream2_get_bytes_left(&ctx->gbc));
302 3 if (tex_size < (avctx->coded_width / TEXTURE_BLOCK_W)
303 3 *(avctx->coded_height / TEXTURE_BLOCK_H)
304
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 3 *ctx->dec[t].tex_ratio) {
305 ✗ av_log(avctx, AV_LOG_ERROR, "Insufficient data\n");
306 ✗ return AVERROR_INVALIDDATA;
307 }
308 } else {
309 /* Perform the second-stage decompression */
310 9 ret = av_reallocp(&ctx->tex_buf, ctx->tex_size);
311
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 9 if (ret < 0)
312 ✗ return ret;
313 9 memset(ctx->tex_buf, 0, ctx->tex_size);
314
315 9 avctx->execute2(avctx, decompress_chunks_thread, NULL,
316 ctx->chunk_results, ctx->chunk_count);
317
318
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 59 for (i = 0; i < ctx->chunk_count; i++) {
319
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 50 if (ctx->chunk_results[i] < 0)
320 ✗ return ctx->chunk_results[i];
321 }
322
323 9 ctx->dec[t].tex_data.in = ctx->tex_buf;
324 }
325
326 12 ctx->dec[t].frame_data.out = frame->data[0];
327 12 ctx->dec[t].stride = frame->linesize[0];
328 12 ctx->dec[t].width = avctx->coded_width;
329 12 ctx->dec[t].height = avctx->coded_height;
330 12 ff_texturedsp_exec_decompress_threads(avctx, &ctx->dec[t]);
331 }
332
333 /* Frame is ready to be output */
334 9 *got_frame = 1;
335
336 9 return avpkt->size;
337 }
338
339 28 static av_cold int hap_init(AVCodecContext *avctx)
340 {
341 28 HapContext *ctx = avctx->priv_data;
342 TextureDSPContext dxtc;
343 const char *texture_name;
344 28 int ret = av_image_check_size(avctx->width, avctx->height, 0, avctx);
345
346
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 28 if (ret < 0) {
347 ✗ av_log(avctx, AV_LOG_ERROR, "Invalid video size %dx%d.\n",
348 avctx->width, avctx->height);
349 ✗ return ret;
350 }
351
352 /* Since codec is based on 4x4 blocks, size is aligned to 4 */
353 28 avctx->coded_width = FFALIGN(avctx->width, TEXTURE_BLOCK_W);
354 28 avctx->coded_height = FFALIGN(avctx->height, TEXTURE_BLOCK_H);
355
356 28 ff_texturedsp_init(&dxtc);
357
358 28 ctx->texture_count = 1;
359 28 ctx->dec[0].raw_ratio = 16;
360 28 ctx->dec[0].slice_count = av_clip(avctx->thread_count, 1,
361 28 avctx->coded_height / TEXTURE_BLOCK_H);
362
363
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 28 switch (avctx->codec_tag) {
364 2 case MKTAG('H','a','p','1'):
365 2 texture_name = "DXT1";
366 2 ctx->dec[0].tex_ratio = 8;
367 2 ctx->dec[0].tex_funct = dxtc.dxt1_block;
368 2 avctx->pix_fmt = AV_PIX_FMT_RGB0;
369 2 break;
370 2 case MKTAG('H','a','p','5'):
371 2 texture_name = "DXT5";
372 2 ctx->dec[0].tex_ratio = 16;
373 2 ctx->dec[0].tex_funct = dxtc.dxt5_block;
374 2 avctx->pix_fmt = AV_PIX_FMT_RGBA;
375 2 break;
376 6 case MKTAG('H','a','p','Y'):
377 6 texture_name = "DXT5-YCoCg-scaled";
378 6 ctx->dec[0].tex_ratio = 16;
379 6 ctx->dec[0].tex_funct = dxtc.dxt5ys_block;
380 6 avctx->pix_fmt = AV_PIX_FMT_RGB0;
381 6 break;
382 6 case MKTAG('H','a','p','A'):
383 6 texture_name = "RGTC1";
384 6 ctx->dec[0].tex_ratio = 8;
385 6 ctx->dec[0].tex_funct = dxtc.rgtc1u_gray_block;
386 6 ctx->dec[0].raw_ratio = 4;
387 6 avctx->pix_fmt = AV_PIX_FMT_GRAY8;
388 6 break;
389 12 case MKTAG('H','a','p','M'):
390 12 texture_name = "DXT5-YCoCg-scaled / RGTC1";
391 12 ctx->dec[0].tex_ratio = 16;
392 12 ctx->dec[1].tex_ratio = 8;
393 12 ctx->dec[0].tex_funct = dxtc.dxt5ys_block;
394 12 ctx->dec[1].tex_funct = dxtc.rgtc1u_alpha_block;
395 12 ctx->dec[1].raw_ratio = 16;
396 12 ctx->dec[1].slice_count = ctx->dec[0].slice_count;
397 12 avctx->pix_fmt = AV_PIX_FMT_RGBA;
398 12 ctx->texture_count = 2;
399 12 break;
400 ✗ default:
401 ✗ return AVERROR_DECODER_NOT_FOUND;
402 }
403
404 28 av_log(avctx, AV_LOG_DEBUG, "%s texture\n", texture_name);
405
406 28 return 0;
407 }
408
409 28 static av_cold int hap_close(AVCodecContext *avctx)
410 {
411 28 HapContext *ctx = avctx->priv_data;
412
413 28 ff_hap_free_context(ctx);
414
415 28 return 0;
416 }
417
418 const FFCodec ff_hap_decoder = {
419 .p.name = "hap",
420 CODEC_LONG_NAME("Vidvox Hap"),
421 .p.type = AVMEDIA_TYPE_VIDEO,
422 .p.id = AV_CODEC_ID_HAP,
423 .init = hap_init,
424 FF_CODEC_DECODE_CB(hap_decode),
425 .close = hap_close,
426 .priv_data_size = sizeof(HapContext),
427 .p.capabilities = AV_CODEC_CAP_FRAME_THREADS | AV_CODEC_CAP_SLICE_THREADS |
428 AV_CODEC_CAP_DR1,
429 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
430 .codec_tags = (const uint32_t []){
431 MKTAG('H','a','p','1'),
432 MKTAG('H','a','p','5'),
433 MKTAG('H','a','p','Y'),
434 MKTAG('H','a','p','A'),
435 MKTAG('H','a','p','M'),
436 FF_CODEC_TAGS_END,
437 },
438 };
439