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
FileDataSource()13 FileDataSource::FileDataSource()
14 : force_read_errors_(false),
15 force_streaming_(false) {
16 }
17
Initialize(const base::FilePath & file_path)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
InitializeFromPlatformFile(const base::PlatformFile & file)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
set_host(DataSourceHost * host)39 void FileDataSource::set_host(DataSourceHost* host) {
40 DataSource::set_host(host);
41 UpdateHostBytes();
42 }
43
Stop(const base::Closure & callback)44 void FileDataSource::Stop(const base::Closure& callback) {
45 callback.Run();
46 }
47
Read(int64 position,int size,uint8 * data,const DataSource::ReadCB & read_cb)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
GetSize(int64 * size_out)69 bool FileDataSource::GetSize(int64* size_out) {
70 *size_out = file_.length();
71 return true;
72 }
73
IsStreaming()74 bool FileDataSource::IsStreaming() {
75 return force_streaming_;
76 }
77
SetBitrate(int bitrate)78 void FileDataSource::SetBitrate(int bitrate) {}
79
~FileDataSource()80 FileDataSource::~FileDataSource() {}
81
UpdateHostBytes()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