AudioStreamOutSink.cpp revision 2dd4bdd715f586d4d30cf90cc6fc2bbfbce60fe0
1/* 2 * Copyright (C) 2012 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 "AudioStreamOutSink" 18//#define LOG_NDEBUG 0 19 20#include <utils/Log.h> 21#include <media/nbaio/AudioStreamOutSink.h> 22 23namespace android { 24 25AudioStreamOutSink::AudioStreamOutSink(audio_stream_out *stream) : 26 NBAIO_Sink(), 27 mStream(stream), 28 mStreamBufferSizeBytes(0) 29{ 30 ALOG_ASSERT(stream != NULL); 31} 32 33AudioStreamOutSink::~AudioStreamOutSink() 34{ 35} 36 37ssize_t AudioStreamOutSink::negotiate(const NBAIO_Format offers[], size_t numOffers, 38 NBAIO_Format counterOffers[], size_t& numCounterOffers) 39{ 40 if (mFormat == Format_Invalid) { 41 mStreamBufferSizeBytes = mStream->common.get_buffer_size(&mStream->common); 42 audio_format_t streamFormat = mStream->common.get_format(&mStream->common); 43 if (streamFormat == AUDIO_FORMAT_PCM_16_BIT) { 44 uint32_t sampleRate = mStream->common.get_sample_rate(&mStream->common); 45 audio_channel_mask_t channelMask = 46 (audio_channel_mask_t) mStream->common.get_channels(&mStream->common); 47 mFormat = Format_from_SR_C(sampleRate, popcount(channelMask)); 48 mBitShift = Format_frameBitShift(mFormat); 49 } 50 } 51 return NBAIO_Sink::negotiate(offers, numOffers, counterOffers, numCounterOffers); 52} 53 54ssize_t AudioStreamOutSink::write(const void *buffer, size_t count) 55{ 56 if (!mNegotiated) { 57 return NEGOTIATE; 58 } 59 ALOG_ASSERT(mFormat != Format_Invalid); 60 ssize_t ret = mStream->write(mStream, buffer, count << mBitShift); 61 if (ret > 0) { 62 ret >>= mBitShift; 63 mFramesWritten += ret; 64 } else { 65 // FIXME verify HAL implementations are returning the correct error codes e.g. WOULD_BLOCK 66 } 67 return ret; 68} 69 70status_t AudioStreamOutSink::getNextWriteTimestamp(int64_t *timestamp) { 71 ALOG_ASSERT(timestamp != NULL); 72 73 if (NULL == mStream) 74 return INVALID_OPERATION; 75 76 if (NULL == mStream->get_next_write_timestamp) 77 return INVALID_OPERATION; 78 79 return mStream->get_next_write_timestamp(mStream, timestamp); 80} 81 82} // namespace android 83