1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #include "media/filters/file_data_source.h" 6 7 #include <algorithm> 8 9 #include "base/logging.h" 10 11 namespace media { 12 13 FileDataSource::FileDataSource() 14 : force_read_errors_(false), 15 force_streaming_(false) { 16 } 17 18 bool FileDataSource::Initialize(const base::FilePath& file_path) { 19 DCHECK(!file_.IsValid()); 20 21 if (!file_.Initialize(file_path)) 22 return false; 23 24 UpdateHostBytes(); 25 return true; 26 } 27 28 bool FileDataSource::InitializeFromPlatformFile( 29 const base::PlatformFile& file) { 30 DCHECK(!file_.IsValid()); 31 32 if (!file_.Initialize(file)) 33 return false; 34 35 UpdateHostBytes(); 36 return true; 37 } 38 39 void FileDataSource::set_host(DataSourceHost* host) { 40 DataSource::set_host(host); 41 UpdateHostBytes(); 42 } 43 44 void FileDataSource::Stop(const base::Closure& callback) { 45 callback.Run(); 46 } 47 48 void FileDataSource::Read(int64 position, int size, uint8* data, 49 const DataSource::ReadCB& read_cb) { 50 if (force_read_errors_ || !file_.IsValid()) { 51 read_cb.Run(kReadError); 52 return; 53 } 54 55 int64 file_size = file_.length(); 56 57 CHECK_GE(file_size, 0); 58 CHECK_GE(position, 0); 59 CHECK_GE(size, 0); 60 61 // Cap position and size within bounds. 62 position = std::min(position, file_size); 63 int64 clamped_size = std::min(static_cast<int64>(size), file_size - position); 64 65 memcpy(data, file_.data() + position, clamped_size); 66 read_cb.Run(clamped_size); 67 } 68 69 bool FileDataSource::GetSize(int64* size_out) { 70 *size_out = file_.length(); 71 return true; 72 } 73 74 bool FileDataSource::IsStreaming() { 75 return force_streaming_; 76 } 77 78 void FileDataSource::SetBitrate(int bitrate) {} 79 80 FileDataSource::~FileDataSource() {} 81 82 void FileDataSource::UpdateHostBytes() { 83 if (host() && file_.IsValid()) { 84 host()->SetTotalBytes(file_.length()); 85 host()->AddBufferedByteRange(0, file_.length()); 86 } 87 } 88 89 } // namespace media 90
