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path: root/libavcodec/hapdec.c (plain)
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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 * This file is part of FFmpeg.
7 *
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
12 *
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23/**
24 * @file
25 * Hap decoder
26 *
27 * Fourcc: Hap1, Hap5, HapY
28 *
29 * https://github.com/Vidvox/hap/blob/master/documentation/HapVideoDRAFT.md
30 */
31
32#include <stdint.h>
33
34#include "libavutil/imgutils.h"
35
36#include "avcodec.h"
37#include "bytestream.h"
38#include "hap.h"
39#include "internal.h"
40#include "snappy.h"
41#include "texturedsp.h"
42#include "thread.h"
43
44/* The first three bytes are the size of the section past the header, or zero
45 * if the length is stored in the next long word. The fourth byte in the first
46 * long word indicates the type of the current section. */
47static int parse_section_header(GetByteContext *gbc, int *section_size,
48 enum HapSectionType *section_type)
49{
50 if (bytestream2_get_bytes_left(gbc) < 4)
51 return AVERROR_INVALIDDATA;
52
53 *section_size = bytestream2_get_le24(gbc);
54 *section_type = bytestream2_get_byte(gbc);
55
56 if (*section_size == 0) {
57 if (bytestream2_get_bytes_left(gbc) < 4)
58 return AVERROR_INVALIDDATA;
59
60 *section_size = bytestream2_get_le32(gbc);
61 }
62
63 if (*section_size > bytestream2_get_bytes_left(gbc) || *section_size < 0)
64 return AVERROR_INVALIDDATA;
65 else
66 return 0;
67}
68
69static int hap_parse_decode_instructions(HapContext *ctx, int size)
70{
71 GetByteContext *gbc = &ctx->gbc;
72 int section_size;
73 enum HapSectionType section_type;
74 int is_first_table = 1, had_offsets = 0, had_compressors = 0, had_sizes = 0;
75 int i, ret;
76
77 while (size > 0) {
78 int stream_remaining = bytestream2_get_bytes_left(gbc);
79 ret = parse_section_header(gbc, &section_size, &section_type);
80 if (ret != 0)
81 return ret;
82
83 size -= stream_remaining - bytestream2_get_bytes_left(gbc);
84
85 switch (section_type) {
86 case HAP_ST_COMPRESSOR_TABLE:
87 ret = ff_hap_set_chunk_count(ctx, section_size, is_first_table);
88 if (ret != 0)
89 return ret;
90 for (i = 0; i < section_size; i++) {
91 ctx->chunks[i].compressor = bytestream2_get_byte(gbc) << 4;
92 }
93 had_compressors = 1;
94 is_first_table = 0;
95 break;
96 case HAP_ST_SIZE_TABLE:
97 ret = ff_hap_set_chunk_count(ctx, section_size / 4, is_first_table);
98 if (ret != 0)
99 return ret;
100 for (i = 0; i < section_size / 4; i++) {
101 ctx->chunks[i].compressed_size = bytestream2_get_le32(gbc);
102 }
103 had_sizes = 1;
104 is_first_table = 0;
105 break;
106 case HAP_ST_OFFSET_TABLE:
107 ret = ff_hap_set_chunk_count(ctx, section_size / 4, is_first_table);
108 if (ret != 0)
109 return ret;
110 for (i = 0; i < section_size / 4; i++) {
111 ctx->chunks[i].compressed_offset = bytestream2_get_le32(gbc);
112 }
113 had_offsets = 1;
114 is_first_table = 0;
115 break;
116 default:
117 break;
118 }
119 size -= section_size;
120 }
121
122 if (!had_sizes || !had_compressors)
123 return AVERROR_INVALIDDATA;
124
125 /* The offsets table is optional. If not present than calculate offsets by
126 * summing the sizes of preceding chunks. */
127 if (!had_offsets) {
128 size_t running_size = 0;
129 for (i = 0; i < ctx->chunk_count; i++) {
130 ctx->chunks[i].compressed_offset = running_size;
131 running_size += ctx->chunks[i].compressed_size;
132 }
133 }
134
135 return 0;
136}
137
138static int hap_can_use_tex_in_place(HapContext *ctx)
139{
140 int i;
141 size_t running_offset = 0;
142 for (i = 0; i < ctx->chunk_count; i++) {
143 if (ctx->chunks[i].compressed_offset != running_offset
144 || ctx->chunks[i].compressor != HAP_COMP_NONE)
145 return 0;
146 running_offset += ctx->chunks[i].compressed_size;
147 }
148 return 1;
149}
150
151static int hap_parse_frame_header(AVCodecContext *avctx)
152{
153 HapContext *ctx = avctx->priv_data;
154 GetByteContext *gbc = &ctx->gbc;
155 int section_size;
156 enum HapSectionType section_type;
157 const char *compressorstr;
158 int i, ret;
159
160 ret = parse_section_header(gbc, &section_size, &section_type);
161 if (ret != 0)
162 return ret;
163
164 if ((avctx->codec_tag == MKTAG('H','a','p','1') && (section_type & 0x0F) != HAP_FMT_RGBDXT1) ||
165 (avctx->codec_tag == MKTAG('H','a','p','5') && (section_type & 0x0F) != HAP_FMT_RGBADXT5) ||
166 (avctx->codec_tag == MKTAG('H','a','p','Y') && (section_type & 0x0F) != HAP_FMT_YCOCGDXT5)) {
167 av_log(avctx, AV_LOG_ERROR,
168 "Invalid texture format %#04x.\n", section_type & 0x0F);
169 return AVERROR_INVALIDDATA;
170 }
171
172 switch (section_type & 0xF0) {
173 case HAP_COMP_NONE:
174 case HAP_COMP_SNAPPY:
175 ret = ff_hap_set_chunk_count(ctx, 1, 1);
176 if (ret == 0) {
177 ctx->chunks[0].compressor = section_type & 0xF0;
178 ctx->chunks[0].compressed_offset = 0;
179 ctx->chunks[0].compressed_size = section_size;
180 }
181 if (ctx->chunks[0].compressor == HAP_COMP_NONE) {
182 compressorstr = "none";
183 } else {
184 compressorstr = "snappy";
185 }
186 break;
187 case HAP_COMP_COMPLEX:
188 ret = parse_section_header(gbc, &section_size, &section_type);
189 if (ret == 0 && section_type != HAP_ST_DECODE_INSTRUCTIONS)
190 ret = AVERROR_INVALIDDATA;
191 if (ret == 0)
192 ret = hap_parse_decode_instructions(ctx, section_size);
193 compressorstr = "complex";
194 break;
195 default:
196 ret = AVERROR_INVALIDDATA;
197 break;
198 }
199
200 if (ret != 0)
201 return ret;
202
203 /* Check the frame is valid and read the uncompressed chunk sizes */
204 ctx->tex_size = 0;
205 for (i = 0; i < ctx->chunk_count; i++) {
206 HapChunk *chunk = &ctx->chunks[i];
207
208 /* Check the compressed buffer is valid */
209 if (chunk->compressed_offset + chunk->compressed_size > bytestream2_get_bytes_left(gbc))
210 return AVERROR_INVALIDDATA;
211
212 /* Chunks are unpacked sequentially, ctx->tex_size is the uncompressed
213 * size thus far */
214 chunk->uncompressed_offset = ctx->tex_size;
215
216 /* Fill out uncompressed size */
217 if (chunk->compressor == HAP_COMP_SNAPPY) {
218 GetByteContext gbc_tmp;
219 int64_t uncompressed_size;
220 bytestream2_init(&gbc_tmp, gbc->buffer + chunk->compressed_offset,
221 chunk->compressed_size);
222 uncompressed_size = ff_snappy_peek_uncompressed_length(&gbc_tmp);
223 if (uncompressed_size < 0) {
224 return uncompressed_size;
225 }
226 chunk->uncompressed_size = uncompressed_size;
227 } else if (chunk->compressor == HAP_COMP_NONE) {
228 chunk->uncompressed_size = chunk->compressed_size;
229 } else {
230 return AVERROR_INVALIDDATA;
231 }
232 ctx->tex_size += chunk->uncompressed_size;
233 }
234
235 av_log(avctx, AV_LOG_DEBUG, "%s compressor\n", compressorstr);
236
237 return ret;
238}
239
240static int decompress_chunks_thread(AVCodecContext *avctx, void *arg,
241 int chunk_nb, int thread_nb)
242{
243 HapContext *ctx = avctx->priv_data;
244
245 HapChunk *chunk = &ctx->chunks[chunk_nb];
246 GetByteContext gbc;
247 uint8_t *dst = ctx->tex_buf + chunk->uncompressed_offset;
248
249 bytestream2_init(&gbc, ctx->gbc.buffer + chunk->compressed_offset, chunk->compressed_size);
250
251 if (chunk->compressor == HAP_COMP_SNAPPY) {
252 int ret;
253 int64_t uncompressed_size = ctx->tex_size;
254
255 /* Uncompress the frame */
256 ret = ff_snappy_uncompress(&gbc, dst, &uncompressed_size);
257 if (ret < 0) {
258 av_log(avctx, AV_LOG_ERROR, "Snappy uncompress error\n");
259 return ret;
260 }
261 } else if (chunk->compressor == HAP_COMP_NONE) {
262 bytestream2_get_buffer(&gbc, dst, chunk->compressed_size);
263 }
264
265 return 0;
266}
267
268static int decompress_texture_thread(AVCodecContext *avctx, void *arg,
269 int slice, int thread_nb)
270{
271 HapContext *ctx = avctx->priv_data;
272 AVFrame *frame = arg;
273 const uint8_t *d = ctx->tex_data;
274 int w_block = avctx->coded_width / TEXTURE_BLOCK_W;
275 int h_block = avctx->coded_height / TEXTURE_BLOCK_H;
276 int x, y;
277 int start_slice, end_slice;
278 int base_blocks_per_slice = h_block / ctx->slice_count;
279 int remainder_blocks = h_block % ctx->slice_count;
280
281 /* When the frame height (in blocks) doesn't divide evenly between the
282 * number of slices, spread the remaining blocks evenly between the first
283 * operations */
284 start_slice = slice * base_blocks_per_slice;
285 /* Add any extra blocks (one per slice) that have been added before this slice */
286 start_slice += FFMIN(slice, remainder_blocks);
287
288 end_slice = start_slice + base_blocks_per_slice;
289 /* Add an extra block if there are still remainder blocks to be accounted for */
290 if (slice < remainder_blocks)
291 end_slice++;
292
293 for (y = start_slice; y < end_slice; y++) {
294 uint8_t *p = frame->data[0] + y * frame->linesize[0] * TEXTURE_BLOCK_H;
295 int off = y * w_block;
296 for (x = 0; x < w_block; x++) {
297 ctx->tex_fun(p + x * 16, frame->linesize[0],
298 d + (off + x) * ctx->tex_rat);
299 }
300 }
301
302 return 0;
303}
304
305static int hap_decode(AVCodecContext *avctx, void *data,
306 int *got_frame, AVPacket *avpkt)
307{
308 HapContext *ctx = avctx->priv_data;
309 ThreadFrame tframe;
310 int ret, i;
311 int tex_size;
312
313 bytestream2_init(&ctx->gbc, avpkt->data, avpkt->size);
314
315 /* Check for section header */
316 ret = hap_parse_frame_header(avctx);
317 if (ret < 0)
318 return ret;
319
320 /* Get the output frame ready to receive data */
321 tframe.f = data;
322 ret = ff_thread_get_buffer(avctx, &tframe, 0);
323 if (ret < 0)
324 return ret;
325 if (avctx->codec->update_thread_context)
326 ff_thread_finish_setup(avctx);
327
328 /* Unpack the DXT texture */
329 if (hap_can_use_tex_in_place(ctx)) {
330 /* Only DXTC texture compression in a contiguous block */
331 ctx->tex_data = ctx->gbc.buffer;
332 tex_size = bytestream2_get_bytes_left(&ctx->gbc);
333 } else {
334 /* Perform the second-stage decompression */
335 ret = av_reallocp(&ctx->tex_buf, ctx->tex_size);
336 if (ret < 0)
337 return ret;
338
339 avctx->execute2(avctx, decompress_chunks_thread, NULL,
340 ctx->chunk_results, ctx->chunk_count);
341
342 for (i = 0; i < ctx->chunk_count; i++) {
343 if (ctx->chunk_results[i] < 0)
344 return ctx->chunk_results[i];
345 }
346
347 ctx->tex_data = ctx->tex_buf;
348 tex_size = ctx->tex_size;
349 }
350
351 if (tex_size < (avctx->coded_width / TEXTURE_BLOCK_W)
352 *(avctx->coded_height / TEXTURE_BLOCK_H)
353 *ctx->tex_rat) {
354 av_log(avctx, AV_LOG_ERROR, "Insufficient data\n");
355 return AVERROR_INVALIDDATA;
356 }
357
358 /* Use the decompress function on the texture, one block per thread */
359 avctx->execute2(avctx, decompress_texture_thread, tframe.f, NULL, ctx->slice_count);
360
361 /* Frame is ready to be output */
362 tframe.f->pict_type = AV_PICTURE_TYPE_I;
363 tframe.f->key_frame = 1;
364 *got_frame = 1;
365
366 return avpkt->size;
367}
368
369static av_cold int hap_init(AVCodecContext *avctx)
370{
371 HapContext *ctx = avctx->priv_data;
372 const char *texture_name;
373 int ret = av_image_check_size(avctx->width, avctx->height, 0, avctx);
374
375 if (ret < 0) {
376 av_log(avctx, AV_LOG_ERROR, "Invalid video size %dx%d.\n",
377 avctx->width, avctx->height);
378 return ret;
379 }
380
381 /* Since codec is based on 4x4 blocks, size is aligned to 4 */
382 avctx->coded_width = FFALIGN(avctx->width, TEXTURE_BLOCK_W);
383 avctx->coded_height = FFALIGN(avctx->height, TEXTURE_BLOCK_H);
384
385 ff_texturedsp_init(&ctx->dxtc);
386
387 switch (avctx->codec_tag) {
388 case MKTAG('H','a','p','1'):
389 texture_name = "DXT1";
390 ctx->tex_rat = 8;
391 ctx->tex_fun = ctx->dxtc.dxt1_block;
392 avctx->pix_fmt = AV_PIX_FMT_RGB0;
393 break;
394 case MKTAG('H','a','p','5'):
395 texture_name = "DXT5";
396 ctx->tex_rat = 16;
397 ctx->tex_fun = ctx->dxtc.dxt5_block;
398 avctx->pix_fmt = AV_PIX_FMT_RGBA;
399 break;
400 case MKTAG('H','a','p','Y'):
401 texture_name = "DXT5-YCoCg-scaled";
402 ctx->tex_rat = 16;
403 ctx->tex_fun = ctx->dxtc.dxt5ys_block;
404 avctx->pix_fmt = AV_PIX_FMT_RGB0;
405 break;
406 default:
407 return AVERROR_DECODER_NOT_FOUND;
408 }
409
410 av_log(avctx, AV_LOG_DEBUG, "%s texture\n", texture_name);
411
412 ctx->slice_count = av_clip(avctx->thread_count, 1,
413 avctx->coded_height / TEXTURE_BLOCK_H);
414
415 return 0;
416}
417
418static av_cold int hap_close(AVCodecContext *avctx)
419{
420 HapContext *ctx = avctx->priv_data;
421
422 ff_hap_free_context(ctx);
423
424 return 0;
425}
426
427AVCodec ff_hap_decoder = {
428 .name = "hap",
429 .long_name = NULL_IF_CONFIG_SMALL("Vidvox Hap"),
430 .type = AVMEDIA_TYPE_VIDEO,
431 .id = AV_CODEC_ID_HAP,
432 .init = hap_init,
433 .decode = hap_decode,
434 .close = hap_close,
435 .priv_data_size = sizeof(HapContext),
436 .capabilities = AV_CODEC_CAP_FRAME_THREADS | AV_CODEC_CAP_SLICE_THREADS |
437 AV_CODEC_CAP_DR1,
438 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE |
439 FF_CODEC_CAP_INIT_CLEANUP,
440};
441
generated by cgit at 2024-05-17 15:54:43 (GMT)