blob: 6d7a5f74769f9cbfea7a617c582684986cc0c3ac [file] [log] [blame]
// 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.
#include <stddef.h>
#include <stdint.h>
#include <map>
#include <vector>
#include "base/containers/hash_tables.h"
#include "base/macros.h"
#include "base/time/time.h"
#include "media/midi/usb_midi_export.h"
#include "media/midi/usb_midi_jack.h"
namespace midi {
class UsbMidiDevice;
// UsbMidiInputStream converts USB-MIDI data to MIDI data.
// See "USB Device Class Definition for MIDI Devices" Release 1.0,
// Section 4 "USB-MIDI Event Packets" for details.
class USB_MIDI_EXPORT UsbMidiInputStream {
class USB_MIDI_EXPORT Delegate {
virtual ~Delegate() {}
// This function is called when some data arrives to a USB-MIDI jack.
// An input USB-MIDI jack corresponds to an input MIDIPortInfo.
virtual void OnReceivedData(size_t jack_index,
const uint8_t* data,
size_t size,
base::TimeTicks time) = 0;
// This is public for testing.
struct JackUniqueKey {
JackUniqueKey(UsbMidiDevice* device, int endpoint_number, int cable_number);
bool operator==(const JackUniqueKey& that) const;
bool operator<(const JackUniqueKey& that) const;
UsbMidiDevice* device;
int endpoint_number;
int cable_number;
explicit UsbMidiInputStream(Delegate* delegate);
void Add(const UsbMidiJack& jack);
// This function should be called when some data arrives to a USB-MIDI
// endpoint. This function converts the data to MIDI data and call
// |delegate->OnReceivedData| with it.
// |size| must be a multiple of |kPacketSize|.
void OnReceivedData(UsbMidiDevice* device,
int endpoint_number,
const uint8_t* data,
size_t size,
base::TimeTicks time);
const std::vector<UsbMidiJack>& jacks() const { return jacks_; }
static const size_t kPacketSize = 4;
// Processes a USB-MIDI Event Packet.
// The first |kPacketSize| bytes of |packet| must be accessible.
void ProcessOnePacket(UsbMidiDevice* device,
int endpoint_number,
const uint8_t* packet,
base::TimeTicks time);
std::vector<UsbMidiJack> jacks_;
// A map from UsbMidiJack to its index in |jacks_|.
std::map<JackUniqueKey, size_t> jack_dictionary_;
// Not owned
Delegate* delegate_;
} // namespace midi