15821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Copyright (c) 2012 The Chromium Authors. All rights reserved. 25821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Use of this source code is governed by a BSD-style license that can be 35821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// found in the LICENSE file. 45821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 55821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "media/mp4/avc.h" 65821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 75821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include <algorithm> 85821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include <vector> 95821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "media/mp4/box_definitions.h" 115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "media/mp4/box_reader.h" 125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)namespace media { 145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)namespace mp4 { 155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static const uint8 kAnnexBStartCode[] = {0, 0, 0, 1}; 175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static const int kAnnexBStartCodeSize = 4; 185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static bool ConvertAVCToAnnexBInPlaceForLengthSize4(std::vector<uint8>* buf) { 205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const int kLengthSize = 4; 215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) size_t pos = 0; 225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) while (pos + kLengthSize < buf->size()) { 235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int nal_size = (*buf)[pos]; 245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) nal_size = (nal_size << 8) + (*buf)[pos+1]; 255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) nal_size = (nal_size << 8) + (*buf)[pos+2]; 265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) nal_size = (nal_size << 8) + (*buf)[pos+3]; 275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) std::copy(kAnnexBStartCode, kAnnexBStartCode + kAnnexBStartCodeSize, 285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) buf->begin() + pos); 295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) pos += kLengthSize + nal_size; 305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return pos == buf->size(); 325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// static 355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)bool AVC::ConvertFrameToAnnexB(int length_size, std::vector<uint8>* buffer) { 365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) RCHECK(length_size == 1 || length_size == 2 || length_size == 4); 375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (length_size == 4) 395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return ConvertAVCToAnnexBInPlaceForLengthSize4(buffer); 405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) std::vector<uint8> temp; 425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) temp.swap(*buffer); 435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) buffer->reserve(temp.size() + 32); 445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) size_t pos = 0; 465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) while (pos + length_size < temp.size()) { 475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int nal_size = temp[pos]; 485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (length_size == 2) nal_size = (nal_size << 8) + temp[pos+1]; 495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) pos += length_size; 505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) RCHECK(pos + nal_size <= temp.size()); 525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) buffer->insert(buffer->end(), kAnnexBStartCode, 535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) kAnnexBStartCode + kAnnexBStartCodeSize); 545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) buffer->insert(buffer->end(), temp.begin() + pos, 555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) temp.begin() + pos + nal_size); 565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) pos += nal_size; 575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return pos == temp.size(); 595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// static 625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)bool AVC::ConvertConfigToAnnexB( 635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const AVCDecoderConfigurationRecord& avc_config, 645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) std::vector<uint8>* buffer) { 655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK(buffer->empty()); 665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) buffer->clear(); 675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int total_size = 0; 685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (size_t i = 0; i < avc_config.sps_list.size(); i++) 695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) total_size += avc_config.sps_list[i].size() + kAnnexBStartCodeSize; 705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (size_t i = 0; i < avc_config.pps_list.size(); i++) 715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) total_size += avc_config.pps_list[i].size() + kAnnexBStartCodeSize; 725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) buffer->reserve(total_size); 735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (size_t i = 0; i < avc_config.sps_list.size(); i++) { 755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) buffer->insert(buffer->end(), kAnnexBStartCode, 765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) kAnnexBStartCode + kAnnexBStartCodeSize); 775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) buffer->insert(buffer->end(), avc_config.sps_list[i].begin(), 785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) avc_config.sps_list[i].end()); 795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (size_t i = 0; i < avc_config.pps_list.size(); i++) { 825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) buffer->insert(buffer->end(), kAnnexBStartCode, 835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) kAnnexBStartCode + kAnnexBStartCodeSize); 845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) buffer->insert(buffer->end(), avc_config.pps_list[i].begin(), 855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) avc_config.pps_list[i].end()); 865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return true; 885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} // namespace mp4 915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} // namespace media 92