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// 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 "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(const UsbMidiDescriptorParser&) = delete;
UsbMidiDescriptorParser& operator=(const UsbMidiDescriptorParser&) = delete;
~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_;
};
} // namespace midi
#endif // MEDIA_MIDI_USB_MIDI_DESCRIPTOR_PARSER_H_
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