media/filters/file_data_source.cc

   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 FileDataSource::FileDataSource(base::File file)
  19     : force_read_errors_(false),
  20       force_streaming_(false) {
  21   file_.Initialize(file.Pass());
  22 }
  23
  24 bool FileDataSource::Initialize(const base::FilePath& file_path) {
  25   DCHECK(!file_.IsValid());
  26   return file_.Initialize(file_path);
  27 }
  28
  29 void FileDataSource::Stop(const base::Closure& callback) {
  30   callback.Run();
  31 }
  32
  33 void FileDataSource::Read(int64 position, int size, uint8* data,
  34                           const DataSource::ReadCB& read_cb) {
  35   if (force_read_errors_ || !file_.IsValid()) {
  36     read_cb.Run(kReadError);
  37     return;
  38   }
  39
  40   int64 file_size = file_.length();
  41
  42   CHECK_GE(file_size, 0);
  43   CHECK_GE(position, 0);
  44   CHECK_GE(size, 0);
  45
  46   // Cap position and size within bounds.
  47   position = std::min(position, file_size);
  48   int64 clamped_size = std::min(static_cast<int64>(size), file_size - position);
  49
  50   memcpy(data, file_.data() + position, clamped_size);
  51   read_cb.Run(clamped_size);
  52 }
  53
  54 bool FileDataSource::GetSize(int64* size_out) {
  55   *size_out = file_.length();
  56   return true;
  57 }
  58
  59 bool FileDataSource::IsStreaming() {
  60   return force_streaming_;
  61 }
  62
  63 void FileDataSource::SetBitrate(int bitrate) {}
  64
  65 FileDataSource::~FileDataSource() {}
  66
  67 }  // namespace media