1 // Copyright 2014 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 #ifndef MEDIA_MIDI_USB_MIDI_OUTPUT_STREAM_H_ 6 #define MEDIA_MIDI_USB_MIDI_OUTPUT_STREAM_H_ 7 8 #include <vector> 9 10 #include "base/basictypes.h" 11 #include "media/base/media_export.h" 12 #include "media/midi/usb_midi_jack.h" 13 14 namespace media { 15 16 // UsbMidiOutputStream converts MIDI data to USB-MIDI data. 17 // See "USB Device Class Definition for MIDI Devices" Release 1.0, 18 // Section 4 "USB-MIDI Event Packets" for details. 19 class MEDIA_EXPORT UsbMidiOutputStream { 20 public: 21 explicit UsbMidiOutputStream(const UsbMidiJack& jack); 22 23 // Converts |data| to USB-MIDI data and send it to the jack. 24 void Send(const std::vector<uint8>& data); 25 jack()26 const UsbMidiJack& jack() const { return jack_; } 27 28 private: 29 size_t GetSize(const std::vector<uint8>& data) const; 30 uint8_t Get(const std::vector<uint8>& data, size_t index) const; 31 32 bool PushSysExMessage(const std::vector<uint8>& data, 33 size_t* current, 34 std::vector<uint8>* data_to_send); 35 bool PushSysCommonMessage(const std::vector<uint8>& data, 36 size_t* current, 37 std::vector<uint8>* data_to_send); 38 void PushSysRTMessage(const std::vector<uint8>& data, 39 size_t* current, 40 std::vector<uint8>* data_to_send); 41 bool PushChannelMessage(const std::vector<uint8>& data, 42 size_t* current, 43 std::vector<uint8>* data_to_send); 44 45 static const size_t kPacketContentSize = 3; 46 47 UsbMidiJack jack_; 48 size_t pending_size_; 49 uint8 pending_data_[kPacketContentSize]; 50 bool is_sending_sysex_; 51 52 DISALLOW_COPY_AND_ASSIGN(UsbMidiOutputStream); 53 }; 54 55 } // namespace media 56 57 #endif // MEDIA_MIDI_USB_MIDI_OUTPUT_STREAM_H_ 58