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| 1 // Copyright 2013 The Chromium Authors. All rights reserved. | 1 // Copyright 2013 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
| 4 | 4 |
| 5 #include "media/midi/midi_message_queue.h" | 5 #include "media/midi/midi_message_queue.h" |
| 6 | 6 |
| 7 #include <algorithm> | 7 #include <algorithm> |
| 8 | 8 |
| 9 #include "base/logging.h" | 9 #include "base/logging.h" |
| 10 #include "media/midi/midi_message_util.h" | 10 #include "media/midi/midi_message_util.h" |
| 11 | 11 |
| 12 namespace media { | 12 namespace media { |
| 13 namespace midi { | 13 namespace midi { |
| 14 namespace { | 14 namespace { |
| 15 | 15 |
| 16 const uint8 kSysEx = 0xf0; | 16 const uint8_t kSysEx = 0xf0; |
| 17 const uint8 kEndOfSysEx = 0xf7; | 17 const uint8_t kEndOfSysEx = 0xf7; |
| 18 | 18 |
| 19 bool IsDataByte(uint8 data) { | 19 bool IsDataByte(uint8_t data) { |
| 20 return (data & 0x80) == 0; | 20 return (data & 0x80) == 0; |
| 21 } | 21 } |
| 22 | 22 |
| 23 bool IsSystemRealTimeMessage(uint8 data) { | 23 bool IsSystemRealTimeMessage(uint8_t data) { |
| 24 return 0xf8 <= data; | 24 return 0xf8 <= data; |
| 25 } | 25 } |
| 26 | 26 |
| 27 bool IsSystemMessage(uint8 data) { | 27 bool IsSystemMessage(uint8_t data) { |
| 28 return 0xf0 <= data; | 28 return 0xf0 <= data; |
| 29 } | 29 } |
| 30 | 30 |
| 31 } // namespace | 31 } // namespace |
| 32 | 32 |
| 33 MidiMessageQueue::MidiMessageQueue(bool allow_running_status) | 33 MidiMessageQueue::MidiMessageQueue(bool allow_running_status) |
| 34 : allow_running_status_(allow_running_status) {} | 34 : allow_running_status_(allow_running_status) {} |
| 35 | 35 |
| 36 MidiMessageQueue::~MidiMessageQueue() {} | 36 MidiMessageQueue::~MidiMessageQueue() {} |
| 37 | 37 |
| 38 void MidiMessageQueue::Add(const std::vector<uint8>& data) { | 38 void MidiMessageQueue::Add(const std::vector<uint8_t>& data) { |
| 39 queue_.insert(queue_.end(), data.begin(), data.end()); | 39 queue_.insert(queue_.end(), data.begin(), data.end()); |
| 40 } | 40 } |
| 41 | 41 |
| 42 void MidiMessageQueue::Add(const uint8* data, size_t length) { | 42 void MidiMessageQueue::Add(const uint8_t* data, size_t length) { |
| 43 queue_.insert(queue_.end(), data, data + length); | 43 queue_.insert(queue_.end(), data, data + length); |
| 44 } | 44 } |
| 45 | 45 |
| 46 void MidiMessageQueue::Get(std::vector<uint8>* message) { | 46 void MidiMessageQueue::Get(std::vector<uint8_t>* message) { |
| 47 message->clear(); | 47 message->clear(); |
| 48 | 48 |
| 49 while (true) { | 49 while (true) { |
| 50 // Check if |next_message_| is already a complete MIDI message or not. | 50 // Check if |next_message_| is already a complete MIDI message or not. |
| 51 if (!next_message_.empty()) { | 51 if (!next_message_.empty()) { |
| 52 const uint8 status_byte = next_message_.front(); | 52 const uint8_t status_byte = next_message_.front(); |
| 53 const size_t target_len = GetMidiMessageLength(status_byte); | 53 const size_t target_len = GetMidiMessageLength(status_byte); |
| 54 if (target_len == 0) { | 54 if (target_len == 0) { |
| 55 DCHECK_EQ(kSysEx, status_byte); | 55 DCHECK_EQ(kSysEx, status_byte); |
| 56 if (next_message_.back() == kEndOfSysEx) { | 56 if (next_message_.back() == kEndOfSysEx) { |
| 57 // OK, this is a complete SysEx message. | 57 // OK, this is a complete SysEx message. |
| 58 std::swap(*message, next_message_); | 58 std::swap(*message, next_message_); |
| 59 DCHECK(next_message_.empty()); | 59 DCHECK(next_message_.empty()); |
| 60 return; | 60 return; |
| 61 } | 61 } |
| 62 } else if (next_message_.size() == target_len) { | 62 } else if (next_message_.size() == target_len) { |
| (...skipping 13 matching lines...) Expand all Loading... |
| 76 } | 76 } |
| 77 } | 77 } |
| 78 | 78 |
| 79 if (queue_.empty()) | 79 if (queue_.empty()) |
| 80 return; | 80 return; |
| 81 | 81 |
| 82 // "System Real Time Messages" is a special MIDI message, which can appear | 82 // "System Real Time Messages" is a special MIDI message, which can appear |
| 83 // at an arbitrary byte position of MIDI stream. Here we reorder | 83 // at an arbitrary byte position of MIDI stream. Here we reorder |
| 84 // "System Real Time Messages" prior to |next_message_| so that each message | 84 // "System Real Time Messages" prior to |next_message_| so that each message |
| 85 // can be clearly separated as a complete MIDI message. | 85 // can be clearly separated as a complete MIDI message. |
| 86 const uint8 next = queue_.front(); | 86 const uint8_t next = queue_.front(); |
| 87 if (IsSystemRealTimeMessage(next)) { | 87 if (IsSystemRealTimeMessage(next)) { |
| 88 message->push_back(next); | 88 message->push_back(next); |
| 89 queue_.pop_front(); | 89 queue_.pop_front(); |
| 90 return; | 90 return; |
| 91 } | 91 } |
| 92 | 92 |
| 93 if (next_message_.empty()) { | 93 if (next_message_.empty()) { |
| 94 const size_t target_len = GetMidiMessageLength(next); | 94 const size_t target_len = GetMidiMessageLength(next); |
| 95 // If |target_len| is zero, it means either |next| is not a valid status | 95 // If |target_len| is zero, it means either |next| is not a valid status |
| 96 // byte or |next| is a valid status byte but the message length is | 96 // byte or |next| is a valid status byte but the message length is |
| 97 // unpredictable. For the latter case, only SysEx can be accepted. | 97 // unpredictable. For the latter case, only SysEx can be accepted. |
| 98 if (target_len > 0 || next == kSysEx) { | 98 if (target_len > 0 || next == kSysEx) { |
| 99 next_message_.push_back(next); | 99 next_message_.push_back(next); |
| 100 } | 100 } |
| 101 // Consume |next| always, since if |next| isn't status byte, which means | 101 // Consume |next| always, since if |next| isn't status byte, which means |
| 102 // that |next| is just corrupted data, or a data byte followed by | 102 // that |next| is just corrupted data, or a data byte followed by |
| 103 // reserved message, which we are unable to understand and deal with | 103 // reserved message, which we are unable to understand and deal with |
| 104 // anyway. | 104 // anyway. |
| 105 queue_.pop_front(); | 105 queue_.pop_front(); |
| 106 continue; | 106 continue; |
| 107 } | 107 } |
| 108 | 108 |
| 109 const uint8 status_byte = next_message_.front(); | 109 const uint8_t status_byte = next_message_.front(); |
| 110 | 110 |
| 111 // If we receive a new non-data byte before completing the pending message, | 111 // If we receive a new non-data byte before completing the pending message, |
| 112 // drop the pending message and respin the loop to re-evaluate |next|. | 112 // drop the pending message and respin the loop to re-evaluate |next|. |
| 113 // This also clears the running status byte speculatively added above, as | 113 // This also clears the running status byte speculatively added above, as |
| 114 // well as any broken incomplete messages. | 114 // well as any broken incomplete messages. |
| 115 if (!IsDataByte(next) && !(status_byte == kSysEx && next == kEndOfSysEx)) { | 115 if (!IsDataByte(next) && !(status_byte == kSysEx && next == kEndOfSysEx)) { |
| 116 next_message_.clear(); | 116 next_message_.clear(); |
| 117 continue; | 117 continue; |
| 118 } | 118 } |
| 119 | 119 |
| 120 // OK to consume this byte. | 120 // OK to consume this byte. |
| 121 next_message_.push_back(next); | 121 next_message_.push_back(next); |
| 122 queue_.pop_front(); | 122 queue_.pop_front(); |
| 123 } | 123 } |
| 124 } | 124 } |
| 125 | 125 |
| 126 } // namespace midi | 126 } // namespace midi |
| 127 } // namespace media | 127 } // namespace media |
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