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_DESCRIPTOR_PARSER_H_ 6 #define MEDIA_MIDI_USB_MIDI_DESCRIPTOR_PARSER_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 class UsbMidiDevice; 17 18 // UsbMidiDescriptorParser parses USB descriptors and 19 // generates input / output lists of MIDIPortInfo. 20 // This is not a generic USB descriptor parser: this parser is designed 21 // for collecting USB-MIDI jacks information from the descriptor. 22 class MEDIA_EXPORT UsbMidiDescriptorParser { 23 public: 24 UsbMidiDescriptorParser(); 25 ~UsbMidiDescriptorParser(); 26 27 // Returns true if the operation succeeds. 28 // When an incorrect input is given, this method may return true but 29 // never crashes. 30 bool Parse(UsbMidiDevice* device, 31 const uint8* data, 32 size_t size, 33 std::vector<UsbMidiJack>* jacks); 34 35 private: 36 bool ParseInternal(UsbMidiDevice* device, 37 const uint8* data, 38 size_t size, 39 std::vector<UsbMidiJack>* jacks); 40 bool ParseInterface(const uint8* data, size_t size); 41 bool ParseCSInterface(UsbMidiDevice* device, const uint8* data, size_t size); 42 bool ParseEndpoint(const uint8* data, size_t size); 43 bool ParseCSEndpoint(const uint8* data, 44 size_t size, 45 std::vector<UsbMidiJack>* jacks); 46 void Clear(); 47 48 bool is_parsing_usb_midi_interface_; 49 uint8 current_endpoint_address_; 50 uint8 current_cable_number_; 51 52 std::vector<UsbMidiJack> incomplete_jacks_; 53 54 DISALLOW_COPY_AND_ASSIGN(UsbMidiDescriptorParser); 55 }; 56 57 58 } // namespace media 59 60 #endif // MEDIA_MIDI_USB_MIDI_DESCRIPTOR_PARSER_H_ 61