LibsndfileSource.cpp revision 2dd4bdd715f586d4d30cf90cc6fc2bbfbce60fe0
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 "LibsndfileSource" 18010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten//#define LOG_NDEBUG 0 19010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten 20010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten#include <utils/Errors.h> 21010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten#include <utils/Log.h> 222dd4bdd715f586d4d30cf90cc6fc2bbfbce60fe0Glenn Kasten#include <media/nbaio/LibsndfileSource.h> 23010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten 24010662326b9c43c703725f933e95e0897f8a6bddGlenn Kastennamespace android { 25010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten 26010662326b9c43c703725f933e95e0897f8a6bddGlenn KastenLibsndfileSource::LibsndfileSource(SNDFILE *sndfile, const SF_INFO &sfinfo, bool loop) : 27010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten NBAIO_Source(Format_from_SR_C(sfinfo.samplerate, sfinfo.channels)), 28010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten mSndfile(sndfile), 29010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten mEstimatedFramesUntilEOF(sfinfo.frames), 30010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten mLooping(loop && sfinfo.seekable), 31010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten mReadAnyFramesThisLoopCycle(false) 32010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten{ 33010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten} 34010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten 35010662326b9c43c703725f933e95e0897f8a6bddGlenn KastenLibsndfileSource::~LibsndfileSource() 36010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten{ 37010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten // do not close mSndfile; we don't own it 38010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten} 39010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten 40010662326b9c43c703725f933e95e0897f8a6bddGlenn Kastenssize_t LibsndfileSource::availableToRead() 41010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten{ 42010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten // after we reach the presumed EOF, report infinity just in case there's actually more 43010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten return !mLooping && mEstimatedFramesUntilEOF > 0 ? mEstimatedFramesUntilEOF : SSIZE_MAX; 44010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten} 45010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten 46010662326b9c43c703725f933e95e0897f8a6bddGlenn Kastenssize_t LibsndfileSource::read(void *buffer, size_t count) 47010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten{ 48010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten if (!mNegotiated) { 49010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten return (ssize_t) NEGOTIATE; 50010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten } 51010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten if (mSndfile == NULL) { 52010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten return (ssize_t) NO_INIT; 53010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten } 54010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten sf_count_t actual = sf_readf_short(mSndfile, (short *) buffer, (sf_count_t) count); 55010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten // Detect EOF by zero frames read, not by mFramesUntilEOF as it could be inaccurate 56010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten if (actual == 0) { 57010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten if (mLooping) { 58010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten if (mReadAnyFramesThisLoopCycle) { 59010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten (void) sf_seek(mSndfile, (sf_count_t) 0, SEEK_SET); 60010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten mReadAnyFramesThisLoopCycle = false; 61010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten } else { 62010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten // We didn't read any frames during the current loop cycle, so disable 63010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten // further looping to prevent the caller from busy waiting at read(). 64010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten // This is especially important when looping an empty file. 65010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten mLooping = false; 66010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten } 67010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten } 68010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten } else { 69010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten mFramesRead += actual; 70010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten if (actual >= mEstimatedFramesUntilEOF) { 71010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten mEstimatedFramesUntilEOF = 0; 72010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten } else { 73010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten mEstimatedFramesUntilEOF -= actual; 74010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten } 75010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten mReadAnyFramesThisLoopCycle = true; 76010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten } 77010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten return actual; 78010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten} 79010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten 80010662326b9c43c703725f933e95e0897f8a6bddGlenn Kasten} // namespace android 81