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.
5 #ifndef MEDIA_MIDI_USB_MIDI_INPUT_STREAM_H_
6 #define MEDIA_MIDI_USB_MIDI_INPUT_STREAM_H_
11 #include "base/basictypes.h"
12 #include "base/containers/hash_tables.h"
13 #include "media/base/media_export.h"
14 #include "media/midi/usb_midi_jack.h"
20 // UsbMidiInputStream converts USB-MIDI data to MIDI data.
21 // See "USB Device Class Definition for MIDI Devices" Release 1.0,
22 // Section 4 "USB-MIDI Event Packets" for details.
23 class MEDIA_EXPORT UsbMidiInputStream {
25 class MEDIA_EXPORT Delegate {
27 virtual ~Delegate() {}
28 // This function is called when some data arrives to a USB-MIDI jack.
29 // An input USB-MIDI jack corresponds to an input MIDIPortInfo.
30 virtual void OnReceivedData(size_t jack_index,
33 double timestamp) = 0;
36 // This is public for testing.
37 struct JackUniqueKey {
38 JackUniqueKey(UsbMidiDevice* device, int endpoint_number, int cable_number);
39 bool operator==(const JackUniqueKey& that) const;
40 bool operator<(const JackUniqueKey& that) const;
42 UsbMidiDevice* device;
47 UsbMidiInputStream(const std::vector<UsbMidiJack>& jacks,
49 ~UsbMidiInputStream();
51 // This function should be called when some data arrives to a USB-MIDI
52 // endpoint. This function converts the data to MIDI data and call
53 // |delegate->OnReceivedData| with it.
54 // |size| must be a multiple of |kPacketSize|.
55 void OnReceivedData(UsbMidiDevice* device,
61 std::vector<JackUniqueKey> RegisteredJackKeysForTesting() const;
64 static const size_t kPacketSize = 4;
65 // Processes a USB-MIDI Event Packet.
66 // The first |kPacketSize| bytes of |packet| must be accessible.
67 void ProcessOnePacket(UsbMidiDevice* device,
72 // A map from UsbMidiJack to its index in |jacks_|.
73 std::map<JackUniqueKey, size_t> jack_dictionary_;
78 DISALLOW_COPY_AND_ASSIGN(UsbMidiInputStream);
83 #endif // MEDIA_MIDI_USB_MIDI_INPUT_STREAM_H_