1 /*
2 * Copyright (C) 2015 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 //#define LOG_NDEBUG 0
18 #define LOG_TAG "HevcUtils"
19
20 #include <cstring>
21 #include <utility>
22
23 #include "include/HevcUtils.h"
24
25 #include <media/stagefright/foundation/ABitReader.h>
26 #include <media/stagefright/foundation/ABuffer.h>
27 #include <media/stagefright/foundation/ADebug.h>
28 #include <media/stagefright/foundation/AMessage.h>
29 #include <media/stagefright/foundation/avc_utils.h>
30 #include <media/stagefright/MediaErrors.h>
31 #include <media/stagefright/Utils.h>
32
33 namespace android {
34
35 static const uint8_t kHevcNalUnitTypes[5] = {
36 kHevcNalUnitTypeVps,
37 kHevcNalUnitTypeSps,
38 kHevcNalUnitTypePps,
39 kHevcNalUnitTypePrefixSei,
40 kHevcNalUnitTypeSuffixSei,
41 };
42
HevcParameterSets()43 HevcParameterSets::HevcParameterSets()
44 : mInfo(kInfoNone) {
45 }
46
addNalUnit(const uint8_t * data,size_t size)47 status_t HevcParameterSets::addNalUnit(const uint8_t* data, size_t size) {
48 if (size < 1) {
49 ALOGE("empty NAL b/35467107");
50 return ERROR_MALFORMED;
51 }
52 uint8_t nalUnitType = (data[0] >> 1) & 0x3f;
53 status_t err = OK;
54 switch (nalUnitType) {
55 case 32: // VPS
56 if (size < 2) {
57 ALOGE("invalid NAL/VPS size b/35467107");
58 return ERROR_MALFORMED;
59 }
60 err = parseVps(data + 2, size - 2);
61 break;
62 case 33: // SPS
63 if (size < 2) {
64 ALOGE("invalid NAL/SPS size b/35467107");
65 return ERROR_MALFORMED;
66 }
67 err = parseSps(data + 2, size - 2);
68 break;
69 case 34: // PPS
70 if (size < 2) {
71 ALOGE("invalid NAL/PPS size b/35467107");
72 return ERROR_MALFORMED;
73 }
74 err = parsePps(data + 2, size - 2);
75 break;
76 case 39: // Prefix SEI
77 case 40: // Suffix SEI
78 // Ignore
79 break;
80 default:
81 ALOGE("Unrecognized NAL unit type.");
82 return ERROR_MALFORMED;
83 }
84
85 if (err != OK) {
86 return err;
87 }
88
89 sp<ABuffer> buffer = ABuffer::CreateAsCopy(data, size);
90 buffer->setInt32Data(nalUnitType);
91 mNalUnits.push(buffer);
92 return OK;
93 }
94
95 template <typename T>
findParam(uint32_t key,T * param,KeyedVector<uint32_t,uint64_t> & params)96 static bool findParam(uint32_t key, T *param,
97 KeyedVector<uint32_t, uint64_t> ¶ms) {
98 CHECK(param);
99 if (params.indexOfKey(key) < 0) {
100 return false;
101 }
102 *param = (T) params[key];
103 return true;
104 }
105
findParam8(uint32_t key,uint8_t * param)106 bool HevcParameterSets::findParam8(uint32_t key, uint8_t *param) {
107 return findParam(key, param, mParams);
108 }
109
findParam16(uint32_t key,uint16_t * param)110 bool HevcParameterSets::findParam16(uint32_t key, uint16_t *param) {
111 return findParam(key, param, mParams);
112 }
113
findParam32(uint32_t key,uint32_t * param)114 bool HevcParameterSets::findParam32(uint32_t key, uint32_t *param) {
115 return findParam(key, param, mParams);
116 }
117
findParam64(uint32_t key,uint64_t * param)118 bool HevcParameterSets::findParam64(uint32_t key, uint64_t *param) {
119 return findParam(key, param, mParams);
120 }
121
getNumNalUnitsOfType(uint8_t type)122 size_t HevcParameterSets::getNumNalUnitsOfType(uint8_t type) {
123 size_t num = 0;
124 for (size_t i = 0; i < mNalUnits.size(); ++i) {
125 if (getType(i) == type) {
126 ++num;
127 }
128 }
129 return num;
130 }
131
getType(size_t index)132 uint8_t HevcParameterSets::getType(size_t index) {
133 CHECK_LT(index, mNalUnits.size());
134 return mNalUnits[index]->int32Data();
135 }
136
getSize(size_t index)137 size_t HevcParameterSets::getSize(size_t index) {
138 CHECK_LT(index, mNalUnits.size());
139 return mNalUnits[index]->size();
140 }
141
write(size_t index,uint8_t * dest,size_t size)142 bool HevcParameterSets::write(size_t index, uint8_t* dest, size_t size) {
143 CHECK_LT(index, mNalUnits.size());
144 const sp<ABuffer>& nalUnit = mNalUnits[index];
145 if (size < nalUnit->size()) {
146 ALOGE("dest buffer size too small: %zu vs. %zu to be written",
147 size, nalUnit->size());
148 return false;
149 }
150 memcpy(dest, nalUnit->data(), nalUnit->size());
151 return true;
152 }
153
parseVps(const uint8_t * data,size_t size)154 status_t HevcParameterSets::parseVps(const uint8_t* data, size_t size) {
155 // See Rec. ITU-T H.265 v3 (04/2015) Chapter 7.3.2.1 for reference
156 NALBitReader reader(data, size);
157 // Skip vps_video_parameter_set_id
158 reader.skipBits(4);
159 // Skip vps_base_layer_internal_flag
160 reader.skipBits(1);
161 // Skip vps_base_layer_available_flag
162 reader.skipBits(1);
163 // Skip vps_max_layers_minus_1
164 reader.skipBits(6);
165 // Skip vps_max_sub_layers_minus1
166 reader.skipBits(3);
167 // Skip vps_temporal_id_nesting_flags
168 reader.skipBits(1);
169 // Skip reserved
170 reader.skipBits(16);
171
172 if (reader.atLeastNumBitsLeft(96)) {
173 mParams.add(kGeneralProfileSpace, reader.getBits(2));
174 mParams.add(kGeneralTierFlag, reader.getBits(1));
175 mParams.add(kGeneralProfileIdc, reader.getBits(5));
176 mParams.add(kGeneralProfileCompatibilityFlags, reader.getBits(32));
177 mParams.add(
178 kGeneralConstraintIndicatorFlags,
179 ((uint64_t)reader.getBits(16) << 32) | reader.getBits(32));
180 mParams.add(kGeneralLevelIdc, reader.getBits(8));
181 // 96 bits total for general profile.
182 } else {
183 reader.skipBits(96);
184 }
185
186 return reader.overRead() ? ERROR_MALFORMED : OK;
187 }
188
parseSps(const uint8_t * data,size_t size)189 status_t HevcParameterSets::parseSps(const uint8_t* data, size_t size) {
190 // See Rec. ITU-T H.265 v3 (04/2015) Chapter 7.3.2.2 for reference
191 NALBitReader reader(data, size);
192 // Skip sps_video_parameter_set_id
193 reader.skipBits(4);
194 uint8_t maxSubLayersMinus1 = reader.getBitsWithFallback(3, 0);
195 // Skip sps_temporal_id_nesting_flag;
196 reader.skipBits(1);
197 // Skip general profile
198 reader.skipBits(96);
199 if (maxSubLayersMinus1 > 0) {
200 bool subLayerProfilePresentFlag[8];
201 bool subLayerLevelPresentFlag[8];
202 for (int i = 0; i < maxSubLayersMinus1; ++i) {
203 subLayerProfilePresentFlag[i] = reader.getBitsWithFallback(1, 0);
204 subLayerLevelPresentFlag[i] = reader.getBitsWithFallback(1, 0);
205 }
206 // Skip reserved
207 reader.skipBits(2 * (8 - maxSubLayersMinus1));
208 for (int i = 0; i < maxSubLayersMinus1; ++i) {
209 if (subLayerProfilePresentFlag[i]) {
210 // Skip profile
211 reader.skipBits(88);
212 }
213 if (subLayerLevelPresentFlag[i]) {
214 // Skip sub_layer_level_idc[i]
215 reader.skipBits(8);
216 }
217 }
218 }
219 // Skip sps_seq_parameter_set_id
220 skipUE(&reader);
221 uint8_t chromaFormatIdc = parseUEWithFallback(&reader, 0);
222 mParams.add(kChromaFormatIdc, chromaFormatIdc);
223 if (chromaFormatIdc == 3) {
224 // Skip separate_colour_plane_flag
225 reader.skipBits(1);
226 }
227 // Skip pic_width_in_luma_samples
228 skipUE(&reader);
229 // Skip pic_height_in_luma_samples
230 skipUE(&reader);
231 if (reader.getBitsWithFallback(1, 0) /* i.e. conformance_window_flag */) {
232 // Skip conf_win_left_offset
233 skipUE(&reader);
234 // Skip conf_win_right_offset
235 skipUE(&reader);
236 // Skip conf_win_top_offset
237 skipUE(&reader);
238 // Skip conf_win_bottom_offset
239 skipUE(&reader);
240 }
241 mParams.add(kBitDepthLumaMinus8, parseUEWithFallback(&reader, 0));
242 mParams.add(kBitDepthChromaMinus8, parseUEWithFallback(&reader, 0));
243
244 // log2_max_pic_order_cnt_lsb_minus4
245 size_t log2MaxPicOrderCntLsb = parseUEWithFallback(&reader, 0) + (size_t)4;
246 bool spsSubLayerOrderingInfoPresentFlag = reader.getBitsWithFallback(1, 0);
247 for (uint32_t i = spsSubLayerOrderingInfoPresentFlag ? 0 : maxSubLayersMinus1;
248 i <= maxSubLayersMinus1; ++i) {
249 skipUE(&reader); // sps_max_dec_pic_buffering_minus1[i]
250 skipUE(&reader); // sps_max_num_reorder_pics[i]
251 skipUE(&reader); // sps_max_latency_increase_plus1[i]
252 }
253
254 skipUE(&reader); // log2_min_luma_coding_block_size_minus3
255 skipUE(&reader); // log2_diff_max_min_luma_coding_block_size
256 skipUE(&reader); // log2_min_luma_transform_block_size_minus2
257 skipUE(&reader); // log2_diff_max_min_luma_transform_block_size
258 skipUE(&reader); // max_transform_hierarchy_depth_inter
259 skipUE(&reader); // max_transform_hierarchy_depth_intra
260 if (reader.getBitsWithFallback(1, 0)) { // scaling_list_enabled_flag u(1)
261 // scaling_list_data
262 if (reader.getBitsWithFallback(1, 0)) { // sps_scaling_list_data_present_flag
263 for (uint32_t sizeId = 0; sizeId < 4; ++sizeId) {
264 for (uint32_t matrixId = 0; matrixId < 6; matrixId += (sizeId == 3) ? 3 : 1) {
265 if (!reader.getBitsWithFallback(1, 1)) {
266 // scaling_list_pred_mode_flag[sizeId][matrixId]
267 skipUE(&reader); // scaling_list_pred_matrix_id_delta[sizeId][matrixId]
268 } else {
269 uint32_t coefNum = std::min(64, (1 << (4 + (sizeId << 1))));
270 if (sizeId > 1) {
271 skipSE(&reader); // scaling_list_dc_coef_minus8[sizeId − 2][matrixId]
272 }
273 for (uint32_t i = 0; i < coefNum; ++i) {
274 skipSE(&reader); // scaling_list_delta_coef
275 }
276 }
277 }
278 }
279 }
280 }
281 reader.skipBits(1); // amp_enabled_flag
282 reader.skipBits(1); // sample_adaptive_offset_enabled_flag u(1)
283 if (reader.getBitsWithFallback(1, 0)) { // pcm_enabled_flag
284 reader.skipBits(4); // pcm_sample_bit_depth_luma_minus1
285 reader.skipBits(4); // pcm_sample_bit_depth_chroma_minus1 u(4)
286 skipUE(&reader); // log2_min_pcm_luma_coding_block_size_minus3
287 skipUE(&reader); // log2_diff_max_min_pcm_luma_coding_block_size
288 reader.skipBits(1); // pcm_loop_filter_disabled_flag
289 }
290 uint32_t numShortTermRefPicSets = parseUEWithFallback(&reader, 0);
291 uint32_t numPics = 0;
292 for (uint32_t i = 0; i < numShortTermRefPicSets; ++i) {
293 // st_ref_pic_set(i)
294 if (i != 0 && reader.getBitsWithFallback(1, 0)) { // inter_ref_pic_set_prediction_flag
295 reader.skipBits(1); // delta_rps_sign
296 skipUE(&reader); // abs_delta_rps_minus1
297 uint32_t nextNumPics = 0;
298 for (uint32_t j = 0; j <= numPics; ++j) {
299 if (reader.getBitsWithFallback(1, 0) // used_by_curr_pic_flag[j]
300 || reader.getBitsWithFallback(1, 0)) { // use_delta_flag[j]
301 ++nextNumPics;
302 }
303 }
304 numPics = nextNumPics;
305 } else {
306 uint32_t numNegativePics = parseUEWithFallback(&reader, 0);
307 uint32_t numPositivePics = parseUEWithFallback(&reader, 0);
308 if (numNegativePics > UINT32_MAX - numPositivePics) {
309 return ERROR_MALFORMED;
310 }
311 numPics = numNegativePics + numPositivePics;
312 for (uint32_t j = 0; j < numPics; ++j) {
313 skipUE(&reader); // delta_poc_s0|1_minus1[i]
314 reader.skipBits(1); // used_by_curr_pic_s0|1_flag[i]
315 if (reader.overRead()) {
316 return ERROR_MALFORMED;
317 }
318 }
319 }
320 if (reader.overRead()) {
321 return ERROR_MALFORMED;
322 }
323 }
324 if (reader.getBitsWithFallback(1, 0)) { // long_term_ref_pics_present_flag
325 uint32_t numLongTermRefPicSps = parseUEWithFallback(&reader, 0);
326 for (uint32_t i = 0; i < numLongTermRefPicSps; ++i) {
327 reader.skipBits(log2MaxPicOrderCntLsb); // lt_ref_pic_poc_lsb_sps[i]
328 reader.skipBits(1); // used_by_curr_pic_lt_sps_flag[i]
329 if (reader.overRead()) {
330 return ERROR_MALFORMED;
331 }
332 }
333 }
334 reader.skipBits(1); // sps_temporal_mvp_enabled_flag
335 reader.skipBits(1); // strong_intra_smoothing_enabled_flag
336 if (reader.getBitsWithFallback(1, 0)) { // vui_parameters_present_flag
337 if (reader.getBitsWithFallback(1, 0)) { // aspect_ratio_info_present_flag
338 uint32_t aspectRatioIdc = reader.getBitsWithFallback(8, 0);
339 if (aspectRatioIdc == 0xFF /* EXTENDED_SAR */) {
340 reader.skipBits(16); // sar_width
341 reader.skipBits(16); // sar_height
342 }
343 }
344 if (reader.getBitsWithFallback(1, 0)) { // overscan_info_present_flag
345 reader.skipBits(1); // overscan_appropriate_flag
346 }
347 if (reader.getBitsWithFallback(1, 0)) { // video_signal_type_present_flag
348 reader.skipBits(3); // video_format
349 uint32_t videoFullRangeFlag;
350 if (reader.getBitsGraceful(1, &videoFullRangeFlag)) {
351 mParams.add(kVideoFullRangeFlag, videoFullRangeFlag);
352 }
353 if (reader.getBitsWithFallback(1, 0)) { // colour_description_present_flag
354 mInfo = (Info)(mInfo | kInfoHasColorDescription);
355 uint32_t colourPrimaries, transferCharacteristics, matrixCoeffs;
356 if (reader.getBitsGraceful(8, &colourPrimaries)) {
357 mParams.add(kColourPrimaries, colourPrimaries);
358 }
359 if (reader.getBitsGraceful(8, &transferCharacteristics)) {
360 mParams.add(kTransferCharacteristics, transferCharacteristics);
361 if (transferCharacteristics == 16 /* ST 2084 */
362 || transferCharacteristics == 18 /* ARIB STD-B67 HLG */) {
363 mInfo = (Info)(mInfo | kInfoIsHdr);
364 }
365 }
366 if (reader.getBitsGraceful(8, &matrixCoeffs)) {
367 mParams.add(kMatrixCoeffs, matrixCoeffs);
368 }
369 }
370 // skip rest of VUI
371 }
372 }
373
374 return reader.overRead() ? ERROR_MALFORMED : OK;
375 }
376
parsePps(const uint8_t * data __unused,size_t size __unused)377 status_t HevcParameterSets::parsePps(
378 const uint8_t* data __unused, size_t size __unused) {
379 return OK;
380 }
381
makeHvcc(uint8_t * hvcc,size_t * hvccSize,size_t nalSizeLength)382 status_t HevcParameterSets::makeHvcc(uint8_t *hvcc, size_t *hvccSize,
383 size_t nalSizeLength) {
384 if (hvcc == NULL || hvccSize == NULL
385 || (nalSizeLength != 4 && nalSizeLength != 2)) {
386 return BAD_VALUE;
387 }
388 // ISO 14496-15: HEVC file format
389 size_t size = 23; // 23 bytes in the header
390 size_t numOfArrays = 0;
391 const size_t numNalUnits = getNumNalUnits();
392 for (size_t i = 0; i < ARRAY_SIZE(kHevcNalUnitTypes); ++i) {
393 uint8_t type = kHevcNalUnitTypes[i];
394 size_t numNalus = getNumNalUnitsOfType(type);
395 if (numNalus == 0) {
396 continue;
397 }
398 ++numOfArrays;
399 size += 3;
400 for (size_t j = 0; j < numNalUnits; ++j) {
401 if (getType(j) != type) {
402 continue;
403 }
404 size += 2 + getSize(j);
405 }
406 }
407 uint8_t generalProfileSpace, generalTierFlag, generalProfileIdc;
408 if (!findParam8(kGeneralProfileSpace, &generalProfileSpace)
409 || !findParam8(kGeneralTierFlag, &generalTierFlag)
410 || !findParam8(kGeneralProfileIdc, &generalProfileIdc)) {
411 return ERROR_MALFORMED;
412 }
413 uint32_t compatibilityFlags;
414 uint64_t constraintIdcFlags;
415 if (!findParam32(kGeneralProfileCompatibilityFlags, &compatibilityFlags)
416 || !findParam64(kGeneralConstraintIndicatorFlags, &constraintIdcFlags)) {
417 return ERROR_MALFORMED;
418 }
419 uint8_t generalLevelIdc;
420 if (!findParam8(kGeneralLevelIdc, &generalLevelIdc)) {
421 return ERROR_MALFORMED;
422 }
423 uint8_t chromaFormatIdc, bitDepthLumaMinus8, bitDepthChromaMinus8;
424 if (!findParam8(kChromaFormatIdc, &chromaFormatIdc)
425 || !findParam8(kBitDepthLumaMinus8, &bitDepthLumaMinus8)
426 || !findParam8(kBitDepthChromaMinus8, &bitDepthChromaMinus8)) {
427 return ERROR_MALFORMED;
428 }
429 if (size > *hvccSize) {
430 return NO_MEMORY;
431 }
432 *hvccSize = size;
433
434 uint8_t *header = hvcc;
435 header[0] = 1;
436 header[1] = (generalProfileSpace << 6) | (generalTierFlag << 5) | generalProfileIdc;
437 header[2] = (compatibilityFlags >> 24) & 0xff;
438 header[3] = (compatibilityFlags >> 16) & 0xff;
439 header[4] = (compatibilityFlags >> 8) & 0xff;
440 header[5] = compatibilityFlags & 0xff;
441 header[6] = (constraintIdcFlags >> 40) & 0xff;
442 header[7] = (constraintIdcFlags >> 32) & 0xff;
443 header[8] = (constraintIdcFlags >> 24) & 0xff;
444 header[9] = (constraintIdcFlags >> 16) & 0xff;
445 header[10] = (constraintIdcFlags >> 8) & 0xff;
446 header[11] = constraintIdcFlags & 0xff;
447 header[12] = generalLevelIdc;
448 // FIXME: parse min_spatial_segmentation_idc.
449 header[13] = 0xf0;
450 header[14] = 0;
451 // FIXME: derive parallelismType properly.
452 header[15] = 0xfc;
453 header[16] = 0xfc | chromaFormatIdc;
454 header[17] = 0xf8 | bitDepthLumaMinus8;
455 header[18] = 0xf8 | bitDepthChromaMinus8;
456 // FIXME: derive avgFrameRate
457 header[19] = 0;
458 header[20] = 0;
459 // constantFrameRate, numTemporalLayers, temporalIdNested all set to 0.
460 header[21] = nalSizeLength - 1;
461 header[22] = numOfArrays;
462 header += 23;
463 for (size_t i = 0; i < ARRAY_SIZE(kHevcNalUnitTypes); ++i) {
464 uint8_t type = kHevcNalUnitTypes[i];
465 size_t numNalus = getNumNalUnitsOfType(type);
466 if (numNalus == 0) {
467 continue;
468 }
469 // array_completeness set to 1.
470 header[0] = type | 0x80;
471 header[1] = (numNalus >> 8) & 0xff;
472 header[2] = numNalus & 0xff;
473 header += 3;
474 for (size_t j = 0; j < numNalUnits; ++j) {
475 if (getType(j) != type) {
476 continue;
477 }
478 header[0] = (getSize(j) >> 8) & 0xff;
479 header[1] = getSize(j) & 0xff;
480 if (!write(j, header + 2, size - (header - (uint8_t *)hvcc))) {
481 return NO_MEMORY;
482 }
483 header += (2 + getSize(j));
484 }
485 }
486 CHECK_EQ(header - size, hvcc);
487
488 return OK;
489 }
490
491 } // namespace android
492