| |
| // Copyright 2014 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef MEDIA_MIDI_USB_MIDI_DESCRIPTOR_PARSER_H_ |
| #define MEDIA_MIDI_USB_MIDI_DESCRIPTOR_PARSER_H_ |
| |
| #include <stddef.h> |
| #include <stdint.h> |
| |
| #include <string> |
| #include <vector> |
| |
| #include "base/macros.h" |
| #include "media/midi/usb_midi_export.h" |
| #include "media/midi/usb_midi_jack.h" |
| |
| namespace midi { |
| |
| class UsbMidiDevice; |
| |
| // UsbMidiDescriptorParser parses USB descriptors and |
| // generates input / output lists of MIDIPortInfo. |
| // This is not a generic USB descriptor parser: this parser is designed |
| // for collecting USB-MIDI jacks information from the descriptor. |
| class USB_MIDI_EXPORT UsbMidiDescriptorParser { |
| public: |
| struct DeviceInfo { |
| DeviceInfo() |
| : vendor_id(0), |
| product_id(0), |
| bcd_device_version(0), |
| manufacturer_index(0), |
| product_index(0) {} |
| uint16_t vendor_id; |
| uint16_t product_id; |
| // The higher one byte represents the "major" number and the lower one byte |
| // represents the "minor" number. |
| uint16_t bcd_device_version; |
| uint8_t manufacturer_index; |
| uint8_t product_index; |
| |
| static std::string BcdVersionToString(uint16_t); |
| }; |
| |
| UsbMidiDescriptorParser(); |
| ~UsbMidiDescriptorParser(); |
| |
| // Returns true if the operation succeeds. |
| // When an incorrect input is given, this method may return true but |
| // never crashes. |
| bool Parse(UsbMidiDevice* device, |
| const uint8_t* data, |
| size_t size, |
| std::vector<UsbMidiJack>* jacks); |
| |
| bool ParseDeviceInfo(const uint8_t* data, size_t size, DeviceInfo* info); |
| |
| private: |
| bool ParseInternal(UsbMidiDevice* device, |
| const uint8_t* data, |
| size_t size, |
| std::vector<UsbMidiJack>* jacks); |
| bool ParseDevice(const uint8_t* data, size_t size, DeviceInfo* info); |
| bool ParseInterface(const uint8_t* data, size_t size); |
| bool ParseCSInterface(UsbMidiDevice* device, |
| const uint8_t* data, |
| size_t size); |
| bool ParseEndpoint(const uint8_t* data, size_t size); |
| bool ParseCSEndpoint(const uint8_t* data, |
| size_t size, |
| std::vector<UsbMidiJack>* jacks); |
| void Clear(); |
| |
| bool is_parsing_usb_midi_interface_; |
| uint8_t current_endpoint_address_; |
| uint8_t current_cable_number_; |
| |
| std::vector<UsbMidiJack> incomplete_jacks_; |
| |
| DISALLOW_COPY_AND_ASSIGN(UsbMidiDescriptorParser); |
| }; |
| |
| } // namespace midi |
| |
| #endif // MEDIA_MIDI_USB_MIDI_DESCRIPTOR_PARSER_H_ |