Mikhail Naganov | c276c59 | 2016-08-31 18:08:10 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (C) 2017 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | #define LOG_TAG "NativeMIDI" |
| 18 | |
| 19 | #include <poll.h> |
| 20 | #include <unistd.h> |
| 21 | |
| 22 | #include <binder/Binder.h> |
| 23 | #include <utils/Errors.h> |
| 24 | #include <utils/Log.h> |
| 25 | |
| 26 | #include "android/media/midi/BpMidiDeviceServer.h" |
| 27 | #include "media/MidiDeviceInfo.h" |
| 28 | #include "MidiDeviceRegistry.h" |
| 29 | #include "MidiPortRegistry.h" |
| 30 | |
| 31 | #include "midi.h" |
| 32 | |
| 33 | using android::IBinder; |
| 34 | using android::BBinder; |
| 35 | using android::OK; |
| 36 | using android::sp; |
| 37 | using android::status_t; |
| 38 | using android::base::unique_fd; |
| 39 | using android::binder::Status; |
| 40 | using android::media::midi::BpMidiDeviceServer; |
| 41 | using android::media::midi::MidiDeviceInfo; |
| 42 | using android::media::midi::MidiDeviceRegistry; |
| 43 | using android::media::midi::MidiPortRegistry; |
| 44 | |
| 45 | #define SIZE_MIDIRECEIVEBUFFER AMIDI_BUFFER_SIZE |
| 46 | |
| 47 | /* TRANSFER PACKET FORMAT (as defined in MidiPortImpl.java) |
| 48 | * |
| 49 | * Transfer packet format is as follows (see MidiOutputPort.mThread.run() to see decomposition): |
| 50 | * |oc|md|md| ......... |md|ts|ts|ts|ts|ts|ts|ts|ts| |
| 51 | * ^ +--------------------+-----------------------+ |
| 52 | * | ^ ^ |
| 53 | * | | | |
| 54 | * | | + timestamp (8 bytes) |
| 55 | * | | |
| 56 | * | + MIDI data bytes (numBytes bytes) |
| 57 | * | |
| 58 | * + OpCode (AMIDI_OPCODE_DATA) |
| 59 | * |
| 60 | * NOTE: The socket pair is configured to use SOCK_SEQPACKET mode. |
| 61 | * SOCK_SEQPACKET, for a sequenced-packet socket that is connection-oriented, preserves message |
| 62 | * boundaries, and delivers messages in the order that they were sent. |
| 63 | * So 'read()' always returns a whole message. |
| 64 | */ |
| 65 | |
| 66 | status_t AMIDI_getDeviceById(int32_t id, AMIDI_Device *devicePtr) { |
| 67 | return MidiDeviceRegistry::getInstance().obtainDeviceToken(id, devicePtr); |
| 68 | } |
| 69 | |
| 70 | status_t AMIDI_getDeviceInfo(AMIDI_Device device, AMIDI_DeviceInfo *deviceInfoPtr) { |
| 71 | sp<BpMidiDeviceServer> deviceServer; |
| 72 | status_t result = MidiDeviceRegistry::getInstance().getDeviceByToken(device, &deviceServer); |
| 73 | if (result != OK) { |
| 74 | ALOGE("AMIDI_getDeviceInfo bad device token %d: %d", device, result); |
| 75 | return result; |
| 76 | } |
| 77 | |
| 78 | MidiDeviceInfo deviceInfo; |
| 79 | Status txResult = deviceServer->getDeviceInfo(&deviceInfo); |
| 80 | if (!txResult.isOk()) { |
| 81 | ALOGE("AMIDI_getDeviceInfo transaction error: %d", txResult.transactionError()); |
| 82 | return txResult.transactionError(); |
| 83 | } |
| 84 | |
| 85 | deviceInfoPtr->type = deviceInfo.getType(); |
| 86 | deviceInfoPtr->uid = deviceInfo.getUid(); |
| 87 | deviceInfoPtr->isPrivate = deviceInfo.isPrivate(); |
| 88 | deviceInfoPtr->inputPortCount = deviceInfo.getInputPortNames().size(); |
| 89 | deviceInfoPtr->outputPortCount = deviceInfo.getOutputPortNames().size(); |
| 90 | return OK; |
| 91 | } |
| 92 | |
| 93 | /* |
| 94 | * Output (receiving) API |
| 95 | */ |
| 96 | status_t AMIDI_openOutputPort(AMIDI_Device device, int portNumber, AMIDI_OutputPort *outputPortPtr) { |
| 97 | sp<BpMidiDeviceServer> deviceServer; |
| 98 | status_t result = MidiDeviceRegistry::getInstance().getDeviceByToken(device, &deviceServer); |
| 99 | if (result != OK) { |
| 100 | ALOGE("AMIDI_openOutputPort bad device token %d: %d", device, result); |
| 101 | return result; |
| 102 | } |
| 103 | |
| 104 | sp<BBinder> portToken(new BBinder()); |
| 105 | unique_fd ufd; |
| 106 | Status txResult = deviceServer->openOutputPort(portToken, portNumber, &ufd); |
| 107 | if (!txResult.isOk()) { |
| 108 | ALOGE("AMIDI_openOutputPort transaction error: %d", txResult.transactionError()); |
| 109 | return txResult.transactionError(); |
| 110 | } |
| 111 | |
| 112 | result = MidiPortRegistry::getInstance().addOutputPort( |
| 113 | device, portToken, std::move(ufd), outputPortPtr); |
| 114 | if (result != OK) { |
| 115 | ALOGE("AMIDI_openOutputPort port registration error: %d", result); |
| 116 | // Close port |
| 117 | return result; |
| 118 | } |
| 119 | return OK; |
| 120 | } |
| 121 | |
| 122 | ssize_t AMIDI_receive(AMIDI_OutputPort outputPort, AMIDI_Message *messages, ssize_t maxMessages) { |
| 123 | unique_fd *ufd; |
| 124 | // TODO: May return a nicer self-unlocking object |
| 125 | status_t result = MidiPortRegistry::getInstance().getOutputPortFdAndLock(outputPort, &ufd); |
| 126 | if (result != OK) { |
| 127 | return result; |
| 128 | } |
| 129 | |
| 130 | ssize_t messagesRead = 0; |
| 131 | while (messagesRead < maxMessages) { |
| 132 | struct pollfd checkFds[1] = { { *ufd, POLLIN, 0 } }; |
| 133 | int pollResult = poll(checkFds, 1, 0); |
| 134 | if (pollResult < 1) { |
| 135 | result = android::INVALID_OPERATION; |
| 136 | break; |
| 137 | } |
| 138 | |
| 139 | AMIDI_Message *message = &messages[messagesRead]; |
| 140 | uint8_t readBuffer[AMIDI_PACKET_SIZE]; |
| 141 | memset(readBuffer, 0, sizeof(readBuffer)); |
| 142 | ssize_t readCount = read(*ufd, readBuffer, sizeof(readBuffer)); |
| 143 | if (readCount == EINTR) { |
| 144 | continue; |
| 145 | } |
| 146 | if (readCount < 1) { |
| 147 | result = android::NOT_ENOUGH_DATA; |
| 148 | break; |
| 149 | } |
| 150 | |
| 151 | // set Packet Format definition at the top of this file. |
| 152 | size_t dataSize = 0; |
| 153 | message->opcode = readBuffer[0]; |
| 154 | message->timestamp = 0; |
| 155 | if (message->opcode == AMIDI_OPCODE_DATA && readCount >= AMIDI_PACKET_OVERHEAD) { |
| 156 | dataSize = readCount - AMIDI_PACKET_OVERHEAD; |
| 157 | if (dataSize) { |
| 158 | memcpy(message->buffer, readBuffer + 1, dataSize); |
| 159 | } |
| 160 | message->timestamp = *(uint64_t*) (readBuffer + readCount - sizeof(uint64_t)); |
| 161 | } |
| 162 | message->len = dataSize; |
| 163 | ++messagesRead; |
| 164 | } |
| 165 | |
| 166 | MidiPortRegistry::getInstance().unlockOutputPort(outputPort); |
| 167 | return result == OK ? messagesRead : result; |
| 168 | } |
| 169 | |
| 170 | status_t AMIDI_closeOutputPort(AMIDI_OutputPort outputPort) { |
| 171 | AMIDI_Device device; |
| 172 | sp<IBinder> portToken; |
| 173 | status_t result = |
| 174 | MidiPortRegistry::getInstance().removeOutputPort(outputPort, &device, &portToken); |
| 175 | if (result != OK) { |
| 176 | return result; |
| 177 | } |
| 178 | |
| 179 | sp<BpMidiDeviceServer> deviceServer; |
| 180 | result = MidiDeviceRegistry::getInstance().getDeviceByToken(device, &deviceServer); |
| 181 | if (result != OK) { |
| 182 | return result; |
| 183 | } |
| 184 | |
| 185 | Status txResult = deviceServer->closePort(portToken); |
| 186 | if (!txResult.isOk()) { |
| 187 | return txResult.transactionError(); |
| 188 | } |
| 189 | return OK; |
| 190 | } |
| 191 | |
| 192 | /* |
| 193 | * Input (sending) API |
| 194 | */ |
| 195 | status_t AMIDI_openInputPort(AMIDI_Device device, int portNumber, AMIDI_InputPort *inputPortPtr) { |
| 196 | sp<BpMidiDeviceServer> deviceServer; |
| 197 | status_t result = MidiDeviceRegistry::getInstance().getDeviceByToken(device, &deviceServer); |
| 198 | if (result != OK) { |
| 199 | ALOGE("AMIDI_openInputPort bad device token %d: %d", device, result); |
| 200 | return result; |
| 201 | } |
| 202 | |
| 203 | sp<BBinder> portToken(new BBinder()); |
| 204 | unique_fd ufd; // this is the file descriptor of the "receive" port s |
| 205 | Status txResult = deviceServer->openInputPort(portToken, portNumber, &ufd); |
| 206 | if (!txResult.isOk()) { |
| 207 | ALOGE("AMIDI_openInputPort transaction error: %d", txResult.transactionError()); |
| 208 | return txResult.transactionError(); |
| 209 | } |
| 210 | |
| 211 | result = MidiPortRegistry::getInstance().addInputPort( |
| 212 | device, portToken, std::move(ufd), inputPortPtr); |
| 213 | if (result != OK) { |
| 214 | ALOGE("AMIDI_openInputPort port registration error: %d", result); |
| 215 | // Close port |
| 216 | return result; |
| 217 | } |
| 218 | |
| 219 | return OK; |
| 220 | } |
| 221 | |
| 222 | status_t AMIDI_closeInputPort(AMIDI_InputPort inputPort) { |
| 223 | AMIDI_Device device; |
| 224 | sp<IBinder> portToken; |
| 225 | status_t result = MidiPortRegistry::getInstance().removeInputPort( |
| 226 | inputPort, &device, &portToken); |
| 227 | if (result != OK) { |
| 228 | ALOGE("AMIDI_closeInputPort remove port error: %d", result); |
| 229 | return result; |
| 230 | } |
| 231 | |
| 232 | sp<BpMidiDeviceServer> deviceServer; |
| 233 | result = MidiDeviceRegistry::getInstance().getDeviceByToken(device, &deviceServer); |
| 234 | if (result != OK) { |
| 235 | ALOGE("AMIDI_closeInputPort can't find device error: %d", result); |
| 236 | return result; |
| 237 | } |
| 238 | |
| 239 | Status txResult = deviceServer->closePort(portToken); |
| 240 | if (!txResult.isOk()) { |
| 241 | result = txResult.transactionError(); |
| 242 | ALOGE("AMIDI_closeInputPort transaction error: %d", result); |
| 243 | return result; |
| 244 | } |
| 245 | |
| 246 | return OK; |
| 247 | } |
| 248 | |
| 249 | ssize_t AMIDI_getMaxMessageSizeInBytes(AMIDI_InputPort /*inputPort*/) { |
| 250 | return SIZE_MIDIRECEIVEBUFFER; |
| 251 | } |
| 252 | |
| 253 | static ssize_t AMIDI_makeSendBuffer(uint8_t *buffer, uint8_t *data, ssize_t numBytes, uint64_t timestamp) { |
| 254 | buffer[0] = AMIDI_OPCODE_DATA; |
| 255 | memcpy(buffer + 1, data, numBytes); |
| 256 | memcpy(buffer + 1 + numBytes, ×tamp, sizeof(timestamp)); |
| 257 | return numBytes + AMIDI_PACKET_OVERHEAD; |
| 258 | } |
| 259 | |
| 260 | // Handy debugging function. |
| 261 | //static void AMIDI_logBuffer(uint8_t *data, size_t numBytes) { |
| 262 | // for (size_t index = 0; index < numBytes; index++) { |
| 263 | // ALOGI(" data @%zu [0x%X]", index, data[index]); |
| 264 | // } |
| 265 | //} |
| 266 | |
| 267 | ssize_t AMIDI_send(AMIDI_InputPort inputPort, uint8_t *buffer, ssize_t numBytes) { |
| 268 | return AMIDI_sendWithTimestamp(inputPort, buffer, numBytes, 0); |
| 269 | } |
| 270 | |
| 271 | ssize_t AMIDI_sendWithTimestamp(AMIDI_InputPort inputPort, uint8_t *data, |
| 272 | ssize_t numBytes, int64_t timestamp) { |
| 273 | |
| 274 | if (numBytes > SIZE_MIDIRECEIVEBUFFER) { |
| 275 | return android::BAD_VALUE; |
| 276 | } |
| 277 | |
| 278 | // AMIDI_logBuffer(data, numBytes); |
| 279 | |
| 280 | unique_fd *ufd = NULL; |
| 281 | status_t result = MidiPortRegistry::getInstance().getInputPortFd(inputPort, &ufd); |
| 282 | if (result != OK) { |
| 283 | return result; |
| 284 | } |
| 285 | |
| 286 | uint8_t writeBuffer[SIZE_MIDIRECEIVEBUFFER + AMIDI_PACKET_OVERHEAD]; |
| 287 | ssize_t numTransferBytes = AMIDI_makeSendBuffer(writeBuffer, data, numBytes, timestamp); |
| 288 | ssize_t numWritten = write(*ufd, writeBuffer, numTransferBytes); |
| 289 | |
| 290 | if (numWritten < numTransferBytes) { |
| 291 | ALOGE("AMIDI_sendWithTimestamp Couldn't write MIDI data buffer. requested:%zu, written%zu", |
| 292 | numTransferBytes, numWritten); |
| 293 | } |
| 294 | |
| 295 | return numWritten - AMIDI_PACKET_OVERHEAD; |
| 296 | } |
| 297 | |
| 298 | status_t AMIDI_flush(AMIDI_InputPort inputPort) { |
| 299 | unique_fd *ufd = NULL; |
| 300 | status_t result = MidiPortRegistry::getInstance().getInputPortFd(inputPort, &ufd); |
| 301 | if (result != OK) { |
| 302 | return result; |
| 303 | } |
| 304 | |
| 305 | uint8_t opCode = AMIDI_OPCODE_FLUSH; |
| 306 | ssize_t numTransferBytes = 1; |
| 307 | ssize_t numWritten = write(*ufd, &opCode, numTransferBytes); |
| 308 | |
| 309 | if (numWritten < numTransferBytes) { |
| 310 | ALOGE("AMIDI_flush Couldn't write MIDI flush. requested:%zu, written%zu", |
| 311 | numTransferBytes, numWritten); |
| 312 | return android::INVALID_OPERATION; |
| 313 | } |
| 314 | |
| 315 | return OK; |
| 316 | } |
| 317 | |