107 lines
3.5 KiB
C++
107 lines
3.5 KiB
C++
// Copyright (c) 2007-2009 Fredrik Mellbin
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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#include "ffaudiosource.h"
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/* Audio Cache */
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TAudioBlock::TAudioBlock(int64_t Start, int64_t Samples, uint8_t *SrcData, size_t SrcBytes) {
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this->Start = Start;
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this->Samples = Samples;
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Data = new uint8_t[SrcBytes];
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memcpy(Data, SrcData, SrcBytes);
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}
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TAudioBlock::~TAudioBlock() {
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delete[] Data;
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}
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TAudioCache::TAudioCache() {
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MaxCacheBlocks = 0;
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BytesPerSample = 0;
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}
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TAudioCache::~TAudioCache() {
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for (TAudioCache::iterator it=begin(); it != end(); it++)
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delete *it;
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}
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void TAudioCache::Initialize(int BytesPerSample, int MaxCacheBlocks) {
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this->BytesPerSample = BytesPerSample;
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this->MaxCacheBlocks = MaxCacheBlocks;
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}
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void TAudioCache::CacheBlock(int64_t Start, int64_t Samples, uint8_t *SrcData) {
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if (BytesPerSample > 0) {
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for (TAudioCache::iterator it=begin(); it != end(); it++) {
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if ((*it)->Start == Start) {
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delete *it;
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erase(it);
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break;
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}
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}
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push_front(new TAudioBlock(Start, Samples, SrcData, static_cast<size_t>(Samples * BytesPerSample)));
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if (static_cast<int>(size()) >= MaxCacheBlocks) {
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delete back();
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pop_back();
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}
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}
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}
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bool TAudioCache::AudioBlockComp(TAudioBlock *A, TAudioBlock *B) {
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return A->Start < B->Start;
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}
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int64_t TAudioCache::FillRequest(int64_t Start, int64_t Samples, uint8_t *Dst) {
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// May be better to move used blocks to the front
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std::list<TAudioBlock *> UsedBlocks;
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for (TAudioCache::iterator it=begin(); it != end(); it++) {
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int64_t SrcOffset = FFMAX(0, Start - (*it)->Start);
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int64_t DstOffset = FFMAX(0, (*it)->Start - Start);
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int64_t CopySamples = FFMIN((*it)->Samples - SrcOffset, Samples - DstOffset);
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if (CopySamples > 0) {
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memcpy(Dst + DstOffset * BytesPerSample, (*it)->Data + SrcOffset * BytesPerSample, static_cast<size_t>(CopySamples * BytesPerSample));
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UsedBlocks.push_back(*it);
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}
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}
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UsedBlocks.sort(AudioBlockComp);
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int64_t Ret = Start;
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for (std::list<TAudioBlock *>::iterator it = UsedBlocks.begin(); it != UsedBlocks.end(); it++) {
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if (it == UsedBlocks.begin() || Ret == (*it)->Start)
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Ret = (*it)->Start + (*it)->Samples;
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else
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break;
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}
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return FFMIN(Ret, Start + Samples);
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}
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/* FFAudio base class */
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FFAudio::FFAudio(const char *SourceFile, FFIndex *Index, char *ErrorMsg, unsigned MsgSize) : DecodingBuffer(AVCODEC_MAX_AUDIO_FRAME_SIZE * 10) {
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if (Index->CompareFileSignature(SourceFile, ErrorMsg, MsgSize))
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throw ErrorMsg;
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CurrentSample = 0;
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}
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FFAudio::~FFAudio() {
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}
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