| /* |
| * Copyright (c) 2019 The WebRTC project authors. All Rights Reserved. |
| * |
| * Use of this source code is governed by a BSD-style license |
| * that can be found in the LICENSE file in the root of the source |
| * tree. An additional intellectual property rights grant can be found |
| * in the file PATENTS. All contributing project authors may |
| * be found in the AUTHORS file in the root of the source tree. |
| */ |
| |
| #include "test/pc/e2e/analyzer/video/single_process_encoded_image_data_injector.h" |
| |
| #include <algorithm> |
| #include <cstddef> |
| |
| #include "absl/memory/memory.h" |
| #include "api/video/encoded_image.h" |
| #include "rtc_base/checks.h" |
| |
| namespace webrtc { |
| namespace webrtc_pc_e2e { |
| namespace { |
| |
| // Number of bytes from the beginning of the EncodedImage buffer that will be |
| // used to store frame id and sub id. |
| constexpr size_t kUsedBufferSize = 3; |
| |
| } // namespace |
| |
| SingleProcessEncodedImageDataInjector::SingleProcessEncodedImageDataInjector() = |
| default; |
| SingleProcessEncodedImageDataInjector:: |
| ~SingleProcessEncodedImageDataInjector() = default; |
| |
| EncodedImage SingleProcessEncodedImageDataInjector::InjectData( |
| uint16_t id, |
| bool discard, |
| const EncodedImage& source, |
| int coding_entity_id) { |
| RTC_CHECK(source.size() >= kUsedBufferSize); |
| |
| ExtractionInfo info; |
| info.length = source.size(); |
| info.discard = discard; |
| size_t insertion_pos = source.size() - kUsedBufferSize; |
| memcpy(info.origin_data, &source.data()[insertion_pos], kUsedBufferSize); |
| { |
| rtc::CritScope crit(&lock_); |
| // Will create new one if missed. |
| ExtractionInfoVector& ev = extraction_cache_[id]; |
| info.sub_id = ev.next_sub_id++; |
| ev.infos[info.sub_id] = info; |
| } |
| |
| EncodedImage out = source; |
| out.data()[insertion_pos] = id & 0x00ff; |
| out.data()[insertion_pos + 1] = (id & 0xff00) >> 8; |
| out.data()[insertion_pos + 2] = info.sub_id; |
| return out; |
| } |
| |
| EncodedImageExtractionResult SingleProcessEncodedImageDataInjector::ExtractData( |
| const EncodedImage& source, |
| int coding_entity_id) { |
| EncodedImage out = source; |
| |
| // Both |source| and |out| image will share the same buffer for payload or |
| // out will have a copy for it, so we can operate on the |out| buffer only. |
| uint8_t* buffer = out.data(); |
| size_t size = out.size(); |
| |
| // |pos| is pointing to end of current encoded image. |
| size_t pos = size - 1; |
| absl::optional<uint16_t> id = absl::nullopt; |
| bool discard = true; |
| std::vector<ExtractionInfo> extraction_infos; |
| // Go through whole buffer and find all related extraction infos in |
| // order from 1st encoded image to the last. |
| while (true) { |
| size_t insertion_pos = pos - kUsedBufferSize + 1; |
| // Extract frame id from first 2 bytes starting from insertion pos. |
| uint16_t next_id = buffer[insertion_pos] + (buffer[insertion_pos + 1] << 8); |
| // Extract frame sub id from second 3 byte starting from insertion pos. |
| uint8_t sub_id = buffer[insertion_pos + 2]; |
| RTC_CHECK(!id || *id == next_id) |
| << "Different frames encoded into single encoded image: " << *id |
| << " vs " << next_id; |
| id = next_id; |
| ExtractionInfo info; |
| { |
| rtc::CritScope crit(&lock_); |
| auto ext_vector_it = extraction_cache_.find(next_id); |
| RTC_CHECK(ext_vector_it != extraction_cache_.end()) |
| << "Unknown frame_id=" << next_id; |
| |
| auto info_it = ext_vector_it->second.infos.find(sub_id); |
| RTC_CHECK(info_it != ext_vector_it->second.infos.end()) |
| << "Unknown sub_id=" << sub_id << " for frame_id=" << next_id; |
| info = info_it->second; |
| ext_vector_it->second.infos.erase(info_it); |
| } |
| extraction_infos.push_back(info); |
| // We need to discard encoded image only if all concatenated encoded images |
| // have to be discarded. |
| discard = discard && info.discard; |
| if (pos < info.length) { |
| break; |
| } |
| pos -= info.length; |
| } |
| RTC_CHECK(id); |
| std::reverse(extraction_infos.begin(), extraction_infos.end()); |
| if (discard) { |
| out.set_size(0); |
| return EncodedImageExtractionResult{*id, out, true}; |
| } |
| |
| // Make a pass from begin to end to restore origin payload and erase discarded |
| // encoded images. |
| pos = 0; |
| auto extraction_infos_it = extraction_infos.begin(); |
| while (pos < size) { |
| RTC_DCHECK(extraction_infos_it != extraction_infos.end()); |
| const ExtractionInfo& info = *extraction_infos_it; |
| if (info.discard) { |
| // If this encoded image is marked to be discarded - erase it's payload |
| // from the buffer. |
| memmove(&buffer[pos], &buffer[pos + info.length], |
| size - pos - info.length); |
| size -= info.length; |
| } else { |
| memcpy(&buffer[pos + info.length - kUsedBufferSize], info.origin_data, |
| kUsedBufferSize); |
| pos += info.length; |
| } |
| ++extraction_infos_it; |
| } |
| out.set_size(pos); |
| |
| return EncodedImageExtractionResult{*id, out, discard}; |
| } |
| |
| SingleProcessEncodedImageDataInjector::ExtractionInfoVector:: |
| ExtractionInfoVector() = default; |
| SingleProcessEncodedImageDataInjector::ExtractionInfoVector:: |
| ~ExtractionInfoVector() = default; |
| |
| } // namespace webrtc_pc_e2e |
| } // namespace webrtc |