15d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles)// Copyright 2014 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) 55d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles)#include "media/formats/mp4/es_descriptor.h" 65821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 75821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "media/base/bit_reader.h" 85d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles)#include "media/formats/mp4/rcheck.h" 95821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// The elementary stream size is specific by up to 4 bytes. 115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// The MSB of a byte indicates if there are more bytes for the size. 125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static bool ReadESSize(media::BitReader* reader, uint32* size) { 135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) uint8 msb; 145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) uint8 byte; 155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) *size = 0; 175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (size_t i = 0; i < 4; ++i) { 195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) RCHECK(reader->ReadBits(1, &msb)); 205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) RCHECK(reader->ReadBits(7, &byte)); 215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) *size = (*size << 7) + byte; 225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (msb == 0) 245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) break; 255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return true; 285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)namespace media { 315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)namespace mp4 { 335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 34c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)// static 35c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)bool ESDescriptor::IsAAC(uint8 object_type) { 36c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) return object_type == kISO_14496_3 || object_type == kISO_13818_7_AAC_LC; 37c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)} 38c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) 395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)ESDescriptor::ESDescriptor() 405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) : object_type_(kForbidden) { 415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)ESDescriptor::~ESDescriptor() {} 445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)bool ESDescriptor::Parse(const std::vector<uint8>& data) { 465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) BitReader reader(&data[0], data.size()); 475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) uint8 tag; 485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) uint32 size; 495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) uint8 stream_dependency_flag; 505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) uint8 url_flag; 515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) uint8 ocr_stream_flag; 525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) uint16 dummy; 535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) RCHECK(reader.ReadBits(8, &tag)); 555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) RCHECK(tag == kESDescrTag); 565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) RCHECK(ReadESSize(&reader, &size)); 575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) RCHECK(reader.ReadBits(16, &dummy)); // ES_ID 595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) RCHECK(reader.ReadBits(1, &stream_dependency_flag)); 605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) RCHECK(reader.ReadBits(1, &url_flag)); 615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) RCHECK(!url_flag); // We don't support url flag 625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) RCHECK(reader.ReadBits(1, &ocr_stream_flag)); 635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) RCHECK(reader.ReadBits(5, &dummy)); // streamPriority 645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (stream_dependency_flag) 665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) RCHECK(reader.ReadBits(16, &dummy)); // dependsOn_ES_ID 675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (ocr_stream_flag) 685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) RCHECK(reader.ReadBits(16, &dummy)); // OCR_ES_Id 695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) RCHECK(ParseDecoderConfigDescriptor(&reader)); 715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return true; 735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)uint8 ESDescriptor::object_type() const { 765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return object_type_; 775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)const std::vector<uint8>& ESDescriptor::decoder_specific_info() const { 805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return decoder_specific_info_; 815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)bool ESDescriptor::ParseDecoderConfigDescriptor(BitReader* reader) { 845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) uint8 tag; 855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) uint32 size; 865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) uint64 dummy; 875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) RCHECK(reader->ReadBits(8, &tag)); 895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) RCHECK(tag == kDecoderConfigDescrTag); 905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) RCHECK(ReadESSize(reader, &size)); 915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) RCHECK(reader->ReadBits(8, &object_type_)); 935821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) RCHECK(reader->ReadBits(64, &dummy)); 945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) RCHECK(reader->ReadBits(32, &dummy)); 955821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) RCHECK(ParseDecoderSpecificInfo(reader)); 965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 975821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return true; 985821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 995821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1005821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)bool ESDescriptor::ParseDecoderSpecificInfo(BitReader* reader) { 1015821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) uint8 tag; 1025821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) uint32 size; 1035821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1045821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) RCHECK(reader->ReadBits(8, &tag)); 1055821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) RCHECK(tag == kDecoderSpecificInfoTag); 1065821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) RCHECK(ReadESSize(reader, &size)); 1075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) decoder_specific_info_.resize(size); 1095821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (uint32 i = 0; i < size; ++i) 1105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) RCHECK(reader->ReadBits(8, &decoder_specific_info_[i])); 1115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return true; 1135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 1145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} // namespace mp4 1165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} // namespace media 118