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81 lines
2.6 KiB
81 lines
2.6 KiB
/*
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* Copyright (C) 2012 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#define LOG_TAG "LibsndfileSource"
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//#define LOG_NDEBUG 0
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#include <utils/Errors.h>
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#include <utils/Log.h>
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#include <media/nbaio/LibsndfileSource.h>
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namespace android {
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LibsndfileSource::LibsndfileSource(SNDFILE *sndfile, const SF_INFO &sfinfo, bool loop) :
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NBAIO_Source(Format_from_SR_C(sfinfo.samplerate, sfinfo.channels)),
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mSndfile(sndfile),
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mEstimatedFramesUntilEOF(sfinfo.frames),
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mLooping(loop && sfinfo.seekable),
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mReadAnyFramesThisLoopCycle(false)
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{
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}
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LibsndfileSource::~LibsndfileSource()
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{
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// do not close mSndfile; we don't own it
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}
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ssize_t LibsndfileSource::availableToRead()
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{
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// after we reach the presumed EOF, report infinity just in case there's actually more
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return !mLooping && mEstimatedFramesUntilEOF > 0 ? mEstimatedFramesUntilEOF : SSIZE_MAX;
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}
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ssize_t LibsndfileSource::read(void *buffer, size_t count)
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{
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if (!mNegotiated) {
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return (ssize_t) NEGOTIATE;
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}
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if (mSndfile == NULL) {
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return (ssize_t) NO_INIT;
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}
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sf_count_t actual = sf_readf_short(mSndfile, (short *) buffer, (sf_count_t) count);
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// Detect EOF by zero frames read, not by mFramesUntilEOF as it could be inaccurate
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if (actual == 0) {
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if (mLooping) {
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if (mReadAnyFramesThisLoopCycle) {
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(void) sf_seek(mSndfile, (sf_count_t) 0, SEEK_SET);
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mReadAnyFramesThisLoopCycle = false;
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} else {
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// We didn't read any frames during the current loop cycle, so disable
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// further looping to prevent the caller from busy waiting at read().
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// This is especially important when looping an empty file.
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mLooping = false;
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}
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}
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} else {
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mFramesRead += actual;
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if (actual >= mEstimatedFramesUntilEOF) {
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mEstimatedFramesUntilEOF = 0;
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} else {
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mEstimatedFramesUntilEOF -= actual;
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}
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mReadAnyFramesThisLoopCycle = true;
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}
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return actual;
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}
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} // namespace android
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