1 /* 2 * Copyright (c) 2013 The WebRTC project authors. All Rights Reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11 #include "webrtc/modules/audio_device/android/opensles_common.h" 12 13 #include <assert.h> 14 15 #include "webrtc/modules/audio_device/android/audio_common.h" 16 17 using webrtc::kNumChannels; 18 19 namespace webrtc_opensl { 20 21 SLDataFormat_PCM CreatePcmConfiguration(int sample_rate) { 22 SLDataFormat_PCM configuration; 23 configuration.formatType = SL_DATAFORMAT_PCM; 24 configuration.numChannels = kNumChannels; 25 // According to the opensles documentation in the ndk: 26 // samplesPerSec is actually in units of milliHz, despite the misleading name. 27 // It further recommends using constants. However, this would lead to a lot 28 // of boilerplate code so it is not done here. 29 configuration.samplesPerSec = sample_rate * 1000; 30 configuration.bitsPerSample = SL_PCMSAMPLEFORMAT_FIXED_16; 31 configuration.containerSize = SL_PCMSAMPLEFORMAT_FIXED_16; 32 configuration.channelMask = SL_SPEAKER_FRONT_CENTER; 33 if (2 == configuration.numChannels) { 34 configuration.channelMask = 35 SL_SPEAKER_FRONT_LEFT | SL_SPEAKER_FRONT_RIGHT; 36 } 37 configuration.endianness = SL_BYTEORDER_LITTLEENDIAN; 38 return configuration; 39 } 40 41 } // namespace webrtc_opensl 42
