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