1010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten/* 2010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten * Copyright (C) 2012 The Android Open Source Project 3010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten * 4010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten * Licensed under the Apache License, Version 2.0 (the "License"); 5010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten * you may not use this file except in compliance with the License. 6010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten * You may obtain a copy of the License at 7010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten * 8010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten * http://www.apache.org/licenses/LICENSE-2.0 9010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten * 10010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten * Unless required by applicable law or agreed to in writing, software 11010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten * distributed under the License is distributed on an "AS IS" BASIS, 12010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten * See the License for the specific language governing permissions and 14010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten * limitations under the License. 15010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten */ 16010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten 17010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten#define LOG_TAG "AudioBufferProviderSource" 18010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten//#define LOG_NDEBUG 0 19010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten 20010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten#include <cutils/compiler.h> 21010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten#include <utils/Log.h> 222dd4bdd715f586d4d30cf90cc6fc2bbfbce60fe0Glenn Kasten#include <media/nbaio/AudioBufferProviderSource.h> 23010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten 24010662326b9c43c703725f933e95e0897f8a6bddGlenn Kastennamespace android { 25010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten 26010662326b9c43c703725f933e95e0897f8a6bddGlenn KastenAudioBufferProviderSource::AudioBufferProviderSource(AudioBufferProvider *provider, 2772e54af9fcdc4754914fe2bf8de699523538b315Glenn Kasten const NBAIO_Format& format) : 28010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten NBAIO_Source(format), mProvider(provider), mConsumed(0) 29010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten{ 30010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten ALOG_ASSERT(provider != NULL); 316e0d67d7b496ce17c0970a4ffd3a6f808860949cGlenn Kasten ALOG_ASSERT(Format_isValid(format)); 32010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten} 33010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten 34010662326b9c43c703725f933e95e0897f8a6bddGlenn KastenAudioBufferProviderSource::~AudioBufferProviderSource() 35010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten{ 36010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten if (mBuffer.raw != NULL) { 37010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten mProvider->releaseBuffer(&mBuffer); 38010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten } 39010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten} 40010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten 41010662326b9c43c703725f933e95e0897f8a6bddGlenn Kastenssize_t AudioBufferProviderSource::availableToRead() 42010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten{ 43010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten if (CC_UNLIKELY(!mNegotiated)) { 44010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten return NEGOTIATE; 45010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten } 46010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten return mBuffer.raw != NULL ? mBuffer.frameCount - mConsumed : 0; 47010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten} 48010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten 49d79072e9dff59f767cce2cda1caab80ce5a0815bGlenn Kastenssize_t AudioBufferProviderSource::read(void *buffer, size_t count) 50010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten{ 51010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten if (CC_UNLIKELY(!mNegotiated)) { 52010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten return NEGOTIATE; 53010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten } 54010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten if (CC_UNLIKELY(mBuffer.raw == NULL)) { 55010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten mBuffer.frameCount = count; 56d79072e9dff59f767cce2cda1caab80ce5a0815bGlenn Kasten status_t status = mProvider->getNextBuffer(&mBuffer); 57010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten if (status != OK) { 58010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten return status == NOT_ENOUGH_DATA ? (ssize_t) WOULD_BLOCK : (ssize_t) status; 59010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten } 60010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten ALOG_ASSERT(mBuffer.raw != NULL); 61010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten // mConsumed is 0 either from constructor or after releaseBuffer() 62010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten } 63010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten size_t available = mBuffer.frameCount - mConsumed; 64010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten if (CC_UNLIKELY(count > available)) { 65010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten count = available; 66010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten } 67010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten // count could be zero, either because count was zero on entry or 68010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten // available is zero, but both are unlikely so don't check for that 694d693d6b8cc1283f92f5301daf19a07abc772a2bGlenn Kasten memcpy(buffer, (char *) mBuffer.raw + (mConsumed * mFrameSize), count * mFrameSize); 70010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten if (CC_UNLIKELY((mConsumed += count) >= mBuffer.frameCount)) { 71010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten mProvider->releaseBuffer(&mBuffer); 72010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten mBuffer.raw = NULL; 73010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten mConsumed = 0; 74010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten } 75010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten mFramesRead += count; 76010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten // For better responsiveness with large values of count, 77010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten // return a short count rather than continuing with next buffer. 78010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten // This gives the caller a chance to interpolate other actions. 79010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten return count; 80010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten} 81010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten 82d79072e9dff59f767cce2cda1caab80ce5a0815bGlenn Kastenssize_t AudioBufferProviderSource::readVia(readVia_t via, size_t total, void *user, size_t block) 83010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten{ 84010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten if (CC_UNLIKELY(!mNegotiated)) { 85010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten return NEGOTIATE; 86010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten } 87010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten if (CC_UNLIKELY(block == 0)) { 88010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten block = ~0; 89010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten } 90010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten for (size_t accumulator = 0; ; ) { 91010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten ALOG_ASSERT(accumulator <= total); 92010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten size_t count = total - accumulator; 93010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten if (CC_UNLIKELY(count == 0)) { 94010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten return accumulator; 95010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten } 96010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten if (CC_LIKELY(count > block)) { 97010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten count = block; 98010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten } 99010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten // 1 <= count <= block 100010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten if (CC_UNLIKELY(mBuffer.raw == NULL)) { 101010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten mBuffer.frameCount = count; 102d79072e9dff59f767cce2cda1caab80ce5a0815bGlenn Kasten status_t status = mProvider->getNextBuffer(&mBuffer); 103010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten if (CC_LIKELY(status == OK)) { 104010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten ALOG_ASSERT(mBuffer.raw != NULL && mBuffer.frameCount <= count); 105010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten // mConsumed is 0 either from constructor or after releaseBuffer() 106010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten continue; 107010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten } 108010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten // FIXME simplify logic - does the initial count and block checks again for no reason; 109010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten // don't you just want to fall through to the size_t available line? 110010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten if (CC_LIKELY(status == NOT_ENOUGH_DATA)) { 111010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten status = WOULD_BLOCK; 112010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten } 113010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten return accumulator > 0 ? accumulator : (ssize_t) status; 114010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten } 115010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten size_t available = mBuffer.frameCount - mConsumed; 116010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten if (CC_UNLIKELY(count > available)) { 117010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten count = available; 118010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten } 119010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten if (CC_LIKELY(count > 0)) { 120d79072e9dff59f767cce2cda1caab80ce5a0815bGlenn Kasten ssize_t ret = via(user, (char *) mBuffer.raw + (mConsumed * mFrameSize), count); 121d79072e9dff59f767cce2cda1caab80ce5a0815bGlenn Kasten 122010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten if (CC_UNLIKELY(ret <= 0)) { 123010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten if (CC_LIKELY(accumulator > 0)) { 124010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten return accumulator; 125010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten } 126010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten return ret; 127010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten } 128010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten ALOG_ASSERT((size_t) ret <= count); 129010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten mFramesRead += ret; 130010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten accumulator += ret; 131010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten if (CC_LIKELY((mConsumed += ret) < mBuffer.frameCount)) { 132010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten continue; 133010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten } 134010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten } 135010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten mProvider->releaseBuffer(&mBuffer); 136010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten mBuffer.raw = NULL; 137010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten mConsumed = 0; 138010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten // don't get next buffer until we really need it 139010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten } 140010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten} 141010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten 142010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten} // namespace android 143