Aegisub/aegisub/libffms/src/core/ffaudiosource.cpp
2009-07-13 22:27:40 +00:00

107 lines
3.5 KiB
C++

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