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      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 "AudioStreamInSource"
     18 //#define LOG_NDEBUG 0
     19 
     20 #include <cutils/compiler.h>
     21 #include <utils/Log.h>
     22 #include <media/audiohal/StreamHalInterface.h>
     23 #include <media/nbaio/AudioStreamInSource.h>
     24 
     25 namespace android {
     26 
     27 AudioStreamInSource::AudioStreamInSource(sp<StreamInHalInterface> stream) :
     28         NBAIO_Source(),
     29         mStream(stream),
     30         mStreamBufferSizeBytes(0),
     31         mFramesOverrun(0),
     32         mOverruns(0)
     33 {
     34     ALOG_ASSERT(stream != 0);
     35 }
     36 
     37 AudioStreamInSource::~AudioStreamInSource()
     38 {
     39     mStream.clear();
     40 }
     41 
     42 ssize_t AudioStreamInSource::negotiate(const NBAIO_Format offers[], size_t numOffers,
     43                                       NBAIO_Format counterOffers[], size_t& numCounterOffers)
     44 {
     45     if (!Format_isValid(mFormat)) {
     46         status_t result;
     47         result = mStream->getBufferSize(&mStreamBufferSizeBytes);
     48         if (result != OK) return result;
     49         audio_format_t streamFormat;
     50         uint32_t sampleRate;
     51         audio_channel_mask_t channelMask;
     52         result = mStream->getAudioProperties(&sampleRate, &channelMask, &streamFormat);
     53         if (result != OK) return result;
     54         mFormat = Format_from_SR_C(sampleRate,
     55                 audio_channel_count_from_in_mask(channelMask), streamFormat);
     56         mFrameSize = Format_frameSize(mFormat);
     57     }
     58     return NBAIO_Source::negotiate(offers, numOffers, counterOffers, numCounterOffers);
     59 }
     60 
     61 int64_t AudioStreamInSource::framesOverrun()
     62 {
     63     uint32_t framesOverrun;
     64     status_t result = mStream->getInputFramesLost(&framesOverrun);
     65     if (result == OK && framesOverrun > 0) {
     66         mFramesOverrun += framesOverrun;
     67         // FIXME only increment for contiguous ranges
     68         ++mOverruns;
     69     } else if (result != OK) {
     70         ALOGE("Error when retrieving lost frames count from HAL: %d", result);
     71     }
     72     return mFramesOverrun;
     73 }
     74 
     75 ssize_t AudioStreamInSource::read(void *buffer, size_t count)
     76 {
     77     if (CC_UNLIKELY(!Format_isValid(mFormat))) {
     78         return NEGOTIATE;
     79     }
     80     size_t bytesRead;
     81     status_t result = mStream->read(buffer, count * mFrameSize, &bytesRead);
     82     if (result == OK && bytesRead > 0) {
     83         size_t framesRead = bytesRead / mFrameSize;
     84         mFramesRead += framesRead;
     85         return framesRead;
     86     } else {
     87         ALOGE_IF(result != OK, "Error while reading data from HAL: %d", result);
     88         return bytesRead;
     89     }
     90 }
     91 
     92 }   // namespace android
     93