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_INPUT_STREAM_H_ 6 #define MEDIA_MIDI_USB_MIDI_INPUT_STREAM_H_ 7 8 #include <map> 9 #include <vector> 10 11 #include "base/basictypes.h" 12 #include "base/containers/hash_tables.h" 13 #include "base/time/time.h" 14 #include "media/base/media_export.h" 15 #include "media/midi/usb_midi_jack.h" 16 17 namespace media { 18 19 class UsbMidiDevice; 20 21 // UsbMidiInputStream converts USB-MIDI data to MIDI data. 22 // See "USB Device Class Definition for MIDI Devices" Release 1.0, 23 // Section 4 "USB-MIDI Event Packets" for details. 24 class MEDIA_EXPORT UsbMidiInputStream { 25 public: 26 class MEDIA_EXPORT Delegate { 27 public: ~Delegate()28 virtual ~Delegate() {} 29 // This function is called when some data arrives to a USB-MIDI jack. 30 // An input USB-MIDI jack corresponds to an input MIDIPortInfo. 31 virtual void OnReceivedData(size_t jack_index, 32 const uint8* data, 33 size_t size, 34 base::TimeTicks time) = 0; 35 }; 36 37 // This is public for testing. 38 struct JackUniqueKey { 39 JackUniqueKey(UsbMidiDevice* device, int endpoint_number, int cable_number); 40 bool operator==(const JackUniqueKey& that) const; 41 bool operator<(const JackUniqueKey& that) const; 42 43 UsbMidiDevice* device; 44 int endpoint_number; 45 int cable_number; 46 }; 47 48 UsbMidiInputStream(const std::vector<UsbMidiJack>& jacks, 49 Delegate* delegate); 50 ~UsbMidiInputStream(); 51 52 // This function should be called when some data arrives to a USB-MIDI 53 // endpoint. This function converts the data to MIDI data and call 54 // |delegate->OnReceivedData| with it. 55 // |size| must be a multiple of |kPacketSize|. 56 void OnReceivedData(UsbMidiDevice* device, 57 int endpoint_number, 58 const uint8* data, 59 size_t size, 60 base::TimeTicks time); 61 62 std::vector<JackUniqueKey> RegisteredJackKeysForTesting() const; 63 64 private: 65 static const size_t kPacketSize = 4; 66 // Processes a USB-MIDI Event Packet. 67 // The first |kPacketSize| bytes of |packet| must be accessible. 68 void ProcessOnePacket(UsbMidiDevice* device, 69 int endpoint_number, 70 const uint8* packet, 71 base::TimeTicks time); 72 73 // A map from UsbMidiJack to its index in |jacks_|. 74 std::map<JackUniqueKey, size_t> jack_dictionary_; 75 76 // Not owned 77 Delegate* delegate_; 78 79 DISALLOW_COPY_AND_ASSIGN(UsbMidiInputStream); 80 }; 81 82 } // namespace media 83 84 #endif // MEDIA_MIDI_USB_MIDI_INPUT_STREAM_H_ 85